阅读说明：本技术 涡旋式压缩机 (Scroll compressor having a discharge port ) 是由 上川隆司 赵洋熙 于 2019-09-26 设计创作，主要内容包括：这里公开一种涡旋式压缩机,其能够优化负载从支撑构件施加到绕动涡旋件的位置。涡旋式压缩机包括：固定涡旋件,固定到主体的内部；绕动涡旋件,配置为与固定涡旋件接合地绕动；旋转轴,配置为允许绕动涡旋件绕动；保持构件,配置为从与绕动涡旋件相反的一侧保持固定涡旋件；以及支撑构件,布置在旋转轴和保持构件之间以通过施加到远离绕动涡旋件的中心的位置的负载而支撑绕动涡旋件。(Disclosed herein is a scroll compressor capable of optimizing a position where a load is applied from a support member to an orbiting scroll. The scroll compressor includes: a fixed scroll fixed to an inside of the body; an orbiting scroll configured to orbit in engagement with the fixed scroll; a rotation shaft configured to allow the orbiting scroll to orbit; a holding member configured to hold the fixed scroll from a side opposite to the orbiting scroll; and a support member disposed between the rotation shaft and the holding member to support the orbiting scroll by a load applied to a position away from a center of the orbiting scroll.)

1. A scroll compressor comprising:

a main body;

a fixed scroll fixed to an inside of the body and provided with a fixed wrap;

an orbiting scroll configured to orbit with respect to the fixed scroll and provided with an orbiting wrap forming a compression chamber together with the fixed wrap;

a main frame configured to support the fixed scroll; and

a sub frame disposed within the main frame to support the orbiting scroll at a position away from a center of the orbiting scroll.

2. The scroll compressor according to claim 1, wherein a gap is formed between the main frame and the sub-frame to allow the sub-frame to be movable with respect to the main frame.

3. The scroll compressor of claim 2, further comprising:

a sealing member configured to seal a gap between the main frame and the sub-frame to form a chamber between the main frame and the sub-frame.

4. The scroll compressor of claim 3, further comprising:

a passage configured to guide the refrigerant discharged from the compression chamber to the chamber.

5. The scroll compressor of claim 4, wherein the passage comprises:

a first passage provided in the orbiting scroll to communicate with the compression chamber;

a second passage provided in the main frame to communicate with the chamber; and

a third passage provided in the fixed scroll to connect the first passage to the second passage.

6. The scroll compressor of claim 5, wherein:

an outlet of the first passage forms a trajectory according to the orbiting motion of the orbiting scroll, an

The entrance of the third channel is arranged on the track.

7. The scroll compressor of claim 1, further comprising:

a rotation shaft to which the orbiting scroll is coupled and along which the orbiting scroll orbits,

wherein the sub-frame is configured to be movable with respect to the main frame in at least one of a first direction extending along the rotation axis or a second direction orthogonal to the first direction.

8. The scroll compressor of claim 1, further comprising:

a rotation shaft inserted into a shaft through hole formed in the main frame and coupled to the orbiting scroll to allow the orbiting scroll to orbit,

wherein the main frame includes a first body portion including a fixed scroll support surface configured to support the fixed scroll and a second body portion located below the first body portion and including the shaft through hole,

wherein the sub-frame includes a first body portion disposed within the first body portion of the main frame and a second body portion inserted into the shaft through hole to be disposed between the rotation shaft and the second body portion of the main frame, and

wherein a gap is formed between the first body portion of the main frame and the first body portion of the sub frame, and a gap is formed between the second body portion of the main frame and the second body portion of the sub frame.

9. The scroll compressor according to claim 8, wherein the gap between the first body portion of the main frame and the first body portion of the sub frame is smaller than the gap between the second body portion of the main frame and the second body portion of the sub frame.

10. The scroll compressor according to claim 8, wherein the sub-frame is configured to be movable with respect to the main frame,

wherein the sub-frame further comprises a thrust bearing located above the first body portion of the sub-frame and comprising an orbiting scroll support surface configured to support the orbiting scroll, an

Wherein the thrust bearing has an elastically deformable shape.

11. The scroll compressor according to claim 8, wherein the sub-frame is configured to be movable with respect to the main frame, and

a protrusion configured to contact the first body portion of the sub frame is formed on an inner surface of the first body portion of the main frame.

12. The scroll compressor according to claim 11, wherein when the sub-frame is tilted while moving with respect to the main frame, the projection of the main frame contacts the first body portion of the sub-frame before the second body portion of the main frame contacts the second body portion of the sub-frame.

13. The scroll compressor of claim 1, further comprising:

an Oldham ring configured to prevent pivoting of the orbiting scroll,

wherein the Oldham ring is coupled to the orbiting scroll and the sub-frame.

14. The scroll compressor of claim 1, further comprising:

an Oldham ring configured to prevent pivoting of the orbiting scroll,

wherein the Oldham ring is coupled to the orbiting scroll and the main frame.

15. The scroll compressor of claim 1, further comprising:

an Oldham ring configured to prevent pivoting of the orbiting scroll,

wherein the Oldham ring is coupled to the orbiting scroll and the fixed scroll.

Technical Field

The present disclosure relates to a scroll compressor.

Background

The scroll compressor is configured as follows. The sealed container is maintained at a high pressure. Providing in a sealed container: a fixed scroll and an orbiting scroll configured such that spiral wraps (wrap) thereof are engaged with each other to form a compression chamber on a support plate; a main shaft configured to drive the orbiting scroll by inserting an eccentric shaft portion into a boss portion provided on a side of the orbiting scroll opposite to the spiral wrap; a compliant frame (compliant frame) configured to support the orbiting scroll member in an axial direction while radially supporting a main shaft that drives the orbiting scroll member on a main shaft portion provided in the main shaft; and a guide frame configured to support the compliant frame in a radial direction so as to be fixed into the sealed container. Therefore, the orbiting scroll is movable in the axial direction by the sliding movement of the compliant frame in the radial direction with respect to the guide frame (refer to patent document).

[ related Art document ]

[ patent documents ]

Japanese patent 5641978(2014.11.07)

Disclosure of Invention

Technical problem

In a state where a support member (which is disposed between a rotation shaft that allows an orbiting scroll to orbit and a holding member that holds a fixed scroll) supports the orbiting scroll, when a configuration is adopted in which the orbiting scroll is made movable only in an axial direction by a sliding movement of the support member with respect to the holding member in the axial direction, it is difficult to optimize a position where a load is applied from the support member to the orbiting scroll.

Accordingly, it is an aspect of the present disclosure to provide a scroll compressor capable of optimizing a position where a load is applied from a support member to an orbiting scroll.

Technical scheme for problems

According to an aspect of the present disclosure, a scroll compressor includes: a fixed scroll fixed to the body; an orbiting scroll configured to orbit in engagement with the fixed scroll; a rotation shaft configured to allow the orbiting scroll to orbit; a holding member configured to hold the fixed scroll from a side opposite to the orbiting scroll; and a support member disposed between the rotation shaft and the holding member to support the orbiting scroll by a load applied to a position away from a center of the orbiting scroll.

The support member may be movable in one direction with respect to the holding member.

The support member may be movable in a direction along the rotation axis and also in a rotation direction about a virtual axis substantially perpendicular to the rotation axis.

The support member may be movable in a direction opposite to a moment generated in the orbiting scroll among the rotation directions about the virtual axis.

The support member may be movable in a rotational direction opposite to a moment generated in the orbiting scroll by receiving a reaction force, which resists a load received by the orbiting scroll in the holding member, from a specific position on the side of the orbiting scroll other than a position receiving the load in the rotational shaft. The specific position may be between an end surface of the rotary shaft bearing of the support member on the orbiting scroll side and a surface of the orbiting scroll on which the plate engages with the fixed scroll.

The support member may be movable in a rotational direction opposite to a moment generated in the orbiting scroll because a minimum gap with the holding member on the same side as the orbiting scroll is smaller than a minimum gap with the holding member on the opposite side to the orbiting scroll with respect to a position receiving a load around the rotational shaft. The specific position may be between an end surface of the rotary shaft bearing of the support member on the orbiting scroll side and a surface of the orbiting scroll on which the plate engages with the fixed scroll.

The support member may be movable in a rotational direction opposite to a moment generated in the orbiting scroll by contacting a protrusion provided on the holding member.

A portion of the support member may have a shape elastically deformable when in contact with a surface on which the plate of the orbiting scroll is engaged with the fixed scroll due to the inclination of the support member.

The scroll compressor may further include an oldham ring configured to prevent pivoting of the orbiting scroll, and the oldham ring may be coupled to the orbiting scroll and the supporting member, the orbiting scroll and the retaining member, or the orbiting scroll and the fixed scroll.

The scroll compressor may further include a sealing mechanism configured to form an inner space between at least the holding member and the support member by sealing at least a portion of a gap between the holding member and the support member.

The holding member may be provided with a holding member internal passage configured to introduce a refrigerant introduced from a compression chamber formed such that the orbiting scroll orbits by engaging with the fixed scroll into the internal space.

The fixed scroll may be provided with a fixed scroll inner passage configured to move refrigerant from the compression chamber and introduce the refrigerant into the holding member inner passage.

The fixed scroll may be provided with a fixed scroll inner passage configured to move refrigerant from the compression chamber and introduce the refrigerant into the holding member inner passage, and the orbiting scroll may be provided with an orbiting scroll inner passage configured to move refrigerant from the compression chamber and introduce the refrigerant into the fixed scroll inner passage. In this case, the fixed scroll inner passage may communicate with the orbiting scroll inner passage during at least a part of the period in which the orbiting scroll orbits. The fixed scroll inner passage may include an inlet on a trajectory of an outlet of the orbiting scroll inner passage as the orbiting scroll orbits, and an inlet connected to a groove portion that covers an entire trajectory of the outlet of the orbiting scroll inner passage as the orbiting scroll orbits.

Advantageous effects of the invention

The position at which the load is applied from the support member to the orbiting scroll can be optimized.

Drawings

Fig. 1 illustrates an axial cross-sectional view of a scroll compressor according to an embodiment of the present disclosure;

fig. 2 illustrates an axial sectional view of a compression part and a rotation shaft of a variation of a scroll compressor according to an embodiment of the present disclosure;

fig. 3 illustrates an axial sectional view of a compression part and a rotation shaft of a variation of a scroll compressor according to an embodiment of the present disclosure;

fig. 4 illustrates an axial sectional view of a compression part and a rotation shaft of a variation of a scroll compressor according to an embodiment of the present disclosure;

fig. 5 illustrates an axial sectional view of a compression part and a rotation shaft of a modification of a scroll compressor according to an embodiment of the present disclosure;

FIG. 6 illustrates an axial cross-sectional view of a scroll compressor according to an embodiment of the present disclosure;

fig. 7A is a perspective view showing a moment received by the orbiting scroll, and fig. 7B is a view showing a shape in which the orbiting scroll is about to be tilted;

fig. 8 shows an axial sectional view of the compression portion and the rotation shaft when a moment applied to the sub frame is in the same direction as a moment applied to the orbiting scroll;

figure 9 shows an axial cross-sectional view of the compression portion and the rotating shaft when the moment applied to the sub-frame is in the opposite direction to the moment applied to the orbiting scroll;

FIG. 10 illustrates an axial cross-sectional view of a compression part and a rotating shaft according to one implementation of a scroll compressor;

FIG. 11 illustrates an axial cross-sectional view of a compression portion and a rotating shaft according to one implementation of a scroll compressor;

FIG. 12 illustrates an axial cross-sectional view of a compression portion and a rotating shaft according to one implementation of a scroll compressor;

fig. 13 illustrates an axial sectional view of a compression part and a rotation shaft of a modification of a scroll compressor according to an embodiment of the present disclosure;

fig. 14 is a plan view illustrating an end portion of a plate of an orbiting scroll in a compression part when viewed from the top according to a modification of a scroll compressor according to an embodiment of the present disclosure;

fig. 15 is a bottom view showing a body portion of a fixed scroll in a compression part when viewed from the bottom according to a modification of the scroll compressor according to an embodiment of the present disclosure;

fig. 16 illustrates an axial sectional view of a compression part and a rotation shaft of a modification of a scroll compressor according to an embodiment of the present disclosure; and

fig. 17 is a bottom view of a body portion of a fixed scroll in a compression part when viewed from the bottom according to a modification of the scroll compressor according to an embodiment of the present disclosure.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the following detailed description, terms of "front end", "rear end", "upper", "lower", and the like may be defined by the accompanying drawings, but the shape and position of the components are not limited by the terms.

According to an embodiment, a scroll compressor is provided with: a fixed scroll; an orbiting scroll configured to orbit in engagement with the fixed scroll; a rotation shaft configured to allow the orbiting scroll to orbit; a holding member configured to hold the fixed scroll on an opposite side of the orbiting scroll; and a support member disposed between the rotation shaft and the holding member. The support member supports the orbiting scroll by a load applied to a position away from the center of the orbiting scroll. That is, a support member may be provided to support the orbiting scroll at a position away from the center of the orbiting scroll. As a specific configuration for supporting the orbiting scroll by a load applied to a position where the support member is offset from the center of the orbiting scroll, some configurations may be considered. Hereinafter, these configurations will be described as embodiments.

Fig. 1 illustrates an axial sectional view of a scroll compressor 1 according to an embodiment of the present disclosure.

The scroll compressor 1 is a compressor widely used for an air conditioner, a refrigerator, and a pump. Fig. 1 is a longitudinal sectional view of a hermetic scroll compressor in a refrigerant circuit for an air conditioner.

The scroll compressor 1 includes a compression part 10 configured to compress a refrigerant, a driving motor 20 configured to drive the compression part 10, and a housing 30 corresponding to a main body configured to receive the compression part 10 and the driving motor 20. According to an embodiment, the scroll compressor 1 is a vertical scroll compressor in which an axial direction of a rotary shaft 23, which will be described later, of the drive motor 20 coincides with a direction of gravity. Hereinafter, the axial direction of the rotary shaft 23 will be referred to as "vertical direction", and based on fig. 1, the upper side may be referred to as "upper side" and the lower side may be referred to as "lower side". Although a vertical scroll compressor is described as an example, embodiments of the present disclosure will be applicable to a horizontal scroll compressor.

First, the compression section 10 will be described.

The compressing part 10 includes: a fixed scroll 11 fixed to the housing 30; an orbiting scroll 12 which orbits by engaging with the fixed scroll 11; a main frame 13 fixed to the housing 30 and configured to support the fixed scroll 11; a sub frame 14 disposed in a space surrounded by the orbiting scroll and the main frame 13 and configured to support the orbiting scroll 12; and an Oldham ring (Oldham ring)15 configured to allow the orbiting scroll 12 to orbit without pivoting the orbiting scroll 12.

The fixed scroll 11 may include a fixed scroll body and a fixed wrap 114 projecting from the fixed scroll body. The fixed wrap 114 may project downwardly from the fixed scroll body.

The fixed scroll body may include a cylindrical body portion 111, a plate 112 configured to cover an opening in an upper side of the body portion 111, and a projection 113 extending in a radially outward direction from a lower end of the body portion 111. The fixed wrap 114 may protrude downward from a lower portion of the plate 112 and have a spiral shape when viewed from the bottom.

The fixed scroll 11 may be formed of cast iron, such as gray cast iron FC 250.

The body portion 111 may be provided with a through hole 111a in a radial direction. The through hole 111a may serve as a suction port configured to suck refrigerant into a space surrounded by the body portion 111, the plate 112, and the orbiting scroll 12.

A through hole 112a in the vertical direction is formed at the center of the plate 112. The through hole 112a may serve as a discharge port configured to discharge refrigerant from a space surrounded by the plate 112, the fixed wrap 114, and the orbiting scroll 12.

The fixed scroll 11 configured as described above is fixed to the main frame 13 by a positioning mechanism such as a bolt or a positioning pin that passes through a through hole formed in the projection 113 in the vertical direction.

The orbiting scroll 12 may include an orbiting scroll body and an orbiting wrap 122, the orbiting wrap 122 protruding from the orbiting scroll body to form the compression chamber 16 by engaging with the fixed wrap 114 of the fixed scroll 11. The orbiting scroll 122 may protrude upward from the orbiting scroll body.

The orbiting scroll 12 may perform an orbiting motion by coupling the rotation shaft 23.

The orbiting scroll body may include a plate 121 having a disk shape and a cylindrical body portion 123 protruding downward from a lower end of the plate 121. The orbiting scroll 122 may protrude upward from the upper end of the plate 121 and have a spiral shape when viewed from the top.

The orbiting scroll 12 may be formed of an FC material or an FCD material.

The orbiting wrap 122 of the orbiting scroll 12 may engage with the fixed wrap 114 of the fixed scroll 11. Further, the orbiting lap 122 of the orbiting scroll 12 and the fixed lap 114 of the fixed scroll 11 may be disposed in a space formed by the body portion 111 of the fixed scroll 11 and the plate 112 and the plate 121 to form the compression chamber 16. Since the orbiting scroll 122 moves circumferentially around the fixed scroll 114, the volume of the compression chamber 16 is reduced and the refrigerant of the compression chamber 16 is compressed. In other words, since the inner space between the fixed wrap 114 and the orbiting wrap 122 is reduced toward the rotational center, the refrigerant is compressed.

An eccentric shaft 232 of a rotation shaft 23 described later is inserted into the body portion 123 through a slide bearing. As described above, the body portion 123 serves as a bearing for the eccentric shaft 232.

The main frame 13 is an example of a holding member configured to hold the fixed scroll 11. The main frame 13 may include a cylindrical first body portion 131, a cylindrical second body portion 132 protruding downward from a radially inner side of a lower end of the first body portion 131, a cylindrical third body portion 133 protruding radially inward from a lower end of the second body portion 132, and a cylindrical fourth body portion 134 protruding upward and downward from an inner end of the third body portion 133. The outer circumferential surface of the first body portion 131 of the main frame 13 is fixed to a later-described center housing 31 of the housing 30. Further, although a journal bearing (journel bearing) is interposed therebetween, a rotary shaft 23 of a drive motor 20 described later is inserted into the interior of the fourth body portion 134. As described above, the main frame 13 also serves as a bearing that rotatably supports the rotating shaft 23.

On an outer peripheral portion of the first body portion 131, a protrusion 131a protruding upward from an upper end surface is mounted. A concave screw is formed in the projection 131a, and a bolt passing through a through hole formed in the projection 113 of the fixed scroll 11 is engaged with the concave screw. Thus, the fixed scroll 11 is fixed to the main frame 13.

On the outer peripheral portion of the first body portion 131, a groove 131b elongated in the vertical direction may be provided. That is, in the first body portion 131, a groove 131b extending in a vertical direction from the center of the outer peripheral portion to the lower portion may be formed. In the first body portion 131, a portion where the groove 131b is formed may be spaced apart from the center housing 31.

The rotary shaft 23 is fitted in the inner periphery of the fourth body portion 134 with a journal bearing interposed therebetween, so that the fourth body portion 134 serves as a bearing that rotatably supports the rotary shaft 23.

The main frame 13 may further include a fixed scroll support surface 11a configured to support the fixed scroll 11. The fixed scroll support surface 11a may be formed on the projection 131 a.

The sub-frame 14 is an example of a support member for supporting the orbiting scroll 12. A gap may be formed between the main frame 13 and the sub-frame 14 so that the sub-frame 14 is movable relative to the main frame 13. In other words, the sub-frame 14 may be arranged within the main frame 13 to be spaced apart from the main frame 13.

The sub-frame 14 may include a cylindrical first body portion 141 and a cylindrical second body portion 142 protruding downward from a lower end surface of the first body portion 141. Between the outer peripheral surface of the first body portion 141 of the sub-frame 14 and the inner peripheral surface of the first body portion 131 of the main frame 13 and between the inner peripheral surface of the second body portion 142 of the sub-frame 14 and the outer peripheral surface of the fourth body portion 134 of the main frame 13, the sub-frame 14 may be disposed in a space surrounded by the orbiting scroll 12 and the main frame 13 with a gap in which the sub-frame 14 is movable with respect to the main frame 13 only in the axial direction of the rotation shaft 23.

Further, in a portion formed by the fourth body portion 134 of the main frame 13 and the first body portion 141 of the sub-frame 14 and a portion formed by the first body portion 131 of the main frame 13 and the first body portion 141 of the sub-frame 14, a first groove 141a and a second groove 141b recessed downward from the upper end surface are formed. In the radial direction, a first groove 141a is formed in the central portion, and a second groove 141b is formed between the first groove 141a and the protrusion 131 a. Further, the body portion 123 of the orbiting scroll 12 is inserted into the first groove 141 a. In the second groove 141b, an oldham ring 15 that prevents the orbiting scroll 12 from pivoting is disposed between the main frame 13 and the orbiting scroll 12.

Further, in the above-described compression portion 10, a discharge passage that discharges the refrigerant compressed in the compression chamber 16 is formed. As for the discharge passage configured to discharge the refrigerant of high pressure, one end thereof is connected to a through hole 112a of the plate 112 (the through hole 112a is configured to discharge the refrigerant of high pressure from the space surrounded by the fixed scroll 11 and the orbiting scroll 12), and the other end thereof is connected to a space lower than the main frame 13 in the housing 30 and is also connected to the chamber 121 a. As for the discharge passage configured to discharge the refrigerant of the intermediate pressure, one end thereof is connected to a discharge port configured to discharge the refrigerant of the intermediate pressure from the space surrounded by the fixed scroll 11 and the orbiting scroll 12, and the other end thereof is connected to the chambers 121b and 142 a.

Next, the drive motor 20 will be described.

The driving motor 20 is fixed to the housing 30 under the compression part 10. The driving motor 20 may include a stator 21 constituting the stator, a rotor 22 constituting the rotor, a rotation shaft 23 supporting the rotor 22 and rotating with respect to the housing 30, and a support member 24 rotatably supporting the rotation shaft 23.

The stator 21 may include a stator body 211 and a coil 212 wound around the stator body 211. The stator body 211 is a laminated body in which a plurality of electric steel plates are laminated, and has an approximately cylindrical shape. The diameter of the outer circumferential surface of the stator main body 211 is formed larger than the diameter of the inner circumferential surface of the center housing 31 of the housing 30 described later. The stator main body 211 (stator 21) is forcibly inserted into the center housing 31. The method of inserting the stator body 211 into the center housing 31 may employ a shrink fit or press fit method.

Further, the stator main body 211 has a plurality of teeth in the circumferential direction on an inner portion facing the outer periphery of the rotor 22. The coils 212 are arranged in slots formed between adjacent teeth. In the stator 21 according to an embodiment, concentrated winding (concentrated winding) in which the coil 212 is inserted into a slot between a plurality of adjacent teeth will be described as an example of the coil 212.

The rotor 22 is a laminated body in which a plurality of electrical steel sheets having a ring shape are laminated and has an approximately cylindrical shape. The diameter of the inner circumferential surface of the rotor 22 is formed smaller than the diameter of the outer circumferential surface of the rotary shaft 23. The rotor 22 is forcibly inserted into the rotation shaft 23. The method for inserting the rotor 22 into the rotation shaft 23 may employ a press-fit method. The rotor 22 is fixed to the rotation shaft 23 and rotates together with the rotation shaft 23. Further, a rotor in which one permanent magnet is embedded is described as an example of the rotor 22.

The diameter of the outer peripheral surface of the rotor 22 is smaller than the diameter of the inner peripheral surface of the stator main body 211 of the stator 21, and a gap is formed between the rotor 22 and the stator 21.

The rotation shaft 23 may include: a main shaft 231 to which the rotor 22 is fitted and coupled to the main shaft 231; and an eccentric shaft 232 provided on an upper portion of the main shaft 231 and having an axis eccentric from the axis of the main shaft 231.

A lower portion of the main shaft 231 is rotatably supported by the support member 24, and an upper portion of the main shaft 231 is rotatably supported by the main frame 13 of the compression part 10. The eccentric shaft 232 is rotatably supported by the body portion 123 of the orbiting scroll 12.

The rotary shaft 23 is provided with a through hole 233 passing through the rotary shaft 23 in the axial direction. In the rotary shaft 23, a first communication hole 234 allowing the through hole 233 to communicate with a bearing of the support member 24, a second communication hole 235 allowing the through hole 233 to communicate with a bearing of the main frame 13, and a third communication hole 236 allowing the through hole 233 to communicate with a bearing of the main body portion 123 are formed in the radial direction.

The support member 24 includes a cylindrical first body portion 241 and a cylindrical second body portion 242 protruding downward from a lower end of the first body portion 241. The support member 24 is fixed to the center housing 31 in such a manner that the outer peripheral surface of the first body portion 241 faces the inner peripheral surface of the center housing 31 of the housing 30 described later. Further, the rotating shaft 23 is inserted into the inside of the first and second body portions 241 and 242 with a journal bearing interposed therebetween. As described above, the support member 24 functions as a bearing that rotatably supports the rotating shaft 23.

Further, in the first body portion 241, a hole and a groove which allow a space higher than the first body portion 241 to communicate with a space lower than the first body portion 241 are formed.

A pump 243 that pumps lubricant is mounted to the lower end of the second body portion 242 of the support member 24.

Next, the housing 30 will be described.

The housing 30 may include: a center housing 31 arranged at the center in the vertical direction and having a cylindrical shape; an upper case 32 covering an upper opening of the center case 31; and a lower case 33 covering the lower opening of the center case 31. Further, the casing 30 may include a discharge portion 34 that discharges the high pressure refrigerant compressed by the compression portion 10 to the outside of the casing 30, and a suction portion 35 that sucks the refrigerant from the outside of the casing 30.

As described above, the main frame 13 of the compression part 10, and the stator 21 and the support member 24 of the driving motor 20 are fixed to the center housing 31. The discharge portion 34 and the suction portion 35 are provided by inserting pipes into through-holes formed in the center housing 31. The suction portion 35 is installed at a position corresponding to a through hole 111a formed in the body portion 111 of the fixed scroll 11. The suction portion 35 sucks the refrigerant from the outside of the housing 30 into a space surrounded by the fixed scroll 11 and the orbiting scroll 12.

The lower housing 33 is formed in a bowl shape, and thus can collect lubricant.

Next, the operation of the scroll compressor 1 will be described.

When the driving motor 20 of the scroll compressor 1 is driven, the rotation shaft 23 is rotated, and the orbiting scroll 12 fitted in the eccentric shaft 232 of the rotation shaft 23 orbits the fixed scroll 11. As the orbiting scroll 12 orbits the fixed scroll 11, low-pressure refrigerant is sucked from the outside of the housing 30 into the space surrounded by the fixed scroll 11 and the orbiting scroll 12 through the suction portion 35. The refrigerant is compressed according to the volume change of the compression chamber 16. The high-pressure refrigerant in the compression chamber 16 is discharged to the lower side of the compression part 10.

The high-pressure refrigerant discharged to the lower side of the compression part 10 is discharged to the outside of the casing 30 through the discharge part 34 provided in the casing 30. In the process of being discharged to the outside of the housing 30, the high-pressure refrigerant is distributed to the gap between the rotor 22 and the stator 21 and the gap between the stator 21 and the center housing 31. After each operation of condensation, expansion, and evaporation in the refrigerant circuit, the high-pressure refrigerant discharged to the outside of the casing 30 is sucked into the suction portion 35 again.

On the other hand, the lubricant stored in the lower housing 33 of the housing 30 is pumped up by the pump 243 and is lifted through the through hole 233 formed in the rotary shaft 23. The raised lubricant is supplied to each bearing of the rotating shaft 23 or to the sliding member of the compression part 10 through the first communication hole 234, the second communication hole 235, and the third communication hole 236 formed in the rotating shaft 23. The lubricant supplied to the sliding member of the compression part 10 or the lubricant supplied to the bearing of the rotary shaft 23 through the second and third communication holes 235 and 236 is returned to the lower housing 33 through the communication hole 131e and the groove 131b formed in the main frame 13, the gap between the rotor 22 and the stator 21, and the axial hole formed in the support member 24, and then stored in the lower portion of the housing 30. In this process and in the process where the high-pressure refrigerant is distributed to the gap between the rotor 22 and the stator 21 before being discharged to the outside of the housing 30, the lubricant and the refrigerant flow into the low-pressure side while cooling the drive motor 20. The lubricant, which has been distributed together with the high-pressure refrigerant, is separated from the refrigerant and then stored in the lower portion of the housing 30.

As described above, in the scroll compressor 1 according to an embodiment, the sub-frame 14 that supports the orbiting scroll 12 is disposed in the space surrounded by the orbiting scroll 12 and the main frame 13.

Since the conventional scroll compressor is not provided with the sub-frame 14, a moment load applied to the orbiting scroll 12 from the refrigerant sucked by the suction portion 35 is offset by an upper thrust load in the fixed scroll 11 and a back pressure load in the orbiting scroll 12. However, in the orbiting scroll 12 according to an embodiment, a moment load F applied to the orbiting scroll 12 from the refrigerant sucked by the suction portion 35_MUpward thrust reaction force F in the fixed scroll 11_UAnd lower surface thrust reaction force F in sub-frame 14_LAnd (4) counteracting.

In this case, the reaction force F is due to the thrust from the upper surface_UOperating point to lower surface thrust reaction force F_LIs longer, so that the lower surface thrust reaction force F is allowed_LLess than the back surface load of a conventional scroll compressor.Further, the upper surface thrust reaction force F is allowed_UIs small. Therefore, the scroll compressor 1 according to an embodiment improves efficiency by reducing friction loss between the fixed scroll 11 and the orbiting scroll 12, and improves reliability by reducing load on sliding portions of the upper and lower surfaces of the plate 121 of the orbiting scroll 12.

Next, a modification of the scroll compressor 1 according to an embodiment will be described.

Fig. 2 is an axial sectional view of a compression part and a rotation shaft of a modification of a scroll compressor according to an embodiment of the present disclosure.

According to a modification of the scroll compressor 1, the compression portion 10 may include a fixed scroll 11, an orbiting scroll 12, a main frame 13, a sub frame 14, and an oldham ring as shown in fig. 1. Further, sealing members 123c and 123d configured to seal a gap between the fourth body portion 134 of the main frame 13 and the body portion 123 of the orbiting scroll 12 are provided in the body portion 123 of the orbiting scroll 12. That is, the sealing members 123c and 123d may be provided between the body portion 123 of the orbiting scroll 12 and the fourth body portion 134 of the main frame 13. According to this modification, since the sealing members 123c and 123d are provided, the inside of the chamber 121a can be maintained at a high pressure. Further, seal members 141c and 141d as examples of first seal members are provided in the first body portion 141 of the sub-frame 14 to seal a gap between the first body portion 141 of the sub-frame 14 and the first body portion 131 of the main frame 13 (a first gap between the sub-frame 14 and the main frame 13), and at the same time, seal members 142c and 142d as examples of second seal members are provided in the second body portion 142 of the sub-frame 14 to seal a gap between the second body portion 142 of the sub-frame 14 and the fourth body portion 134 of the main frame 13 (a second gap between the sub-frame 14 and the main frame 13). Therefore, according to a modification, by providing the sealing members 141c, 141d, 142c, and 142d, the pressure of the chamber 142a can be maintained at a certain intermediate pressure.

Further, according to a modification, there are provided seal members 141c, 141d, 142c, and 142d configured to seal a gap between the sub-frame 14 and the main frame 13. However, it should be understood that a sealing member configured to seal a gap between the subframe 14 and at least one member facing the subframe 14 is provided.

Fig. 3 illustrates an axial sectional view of a compression part and a rotation shaft of a modification of a scroll compressor according to an embodiment of the present disclosure.

With the compression portion 10 according to the modification of the scroll compressor 1, the outer diameter of the sub-frame 14 is increased as compared with the compression portion 10 of the scroll compressor 1 according to the modification shown in fig. 2. As oldham ring 15 moves radially inward, the position at which first body portion 141 of sub-frame 14 supports orbiting scroll member 12 moves radially outward. According to a modification, since the distance from the operating point of the upper thrust reaction force to the operating point of the lower thrust reaction force becomes larger, the upper thrust reaction force and the lower thrust reaction force can be reduced.

Fig. 4 illustrates an axial sectional view of a compression part and a rotation shaft of a modification of a scroll compressor according to an embodiment of the present disclosure.

As for the compression portion 10 according to the modification of the scroll compressor 1, compared with the compression portion 10 of the scroll compressor 1 according to the modification shown in fig. 3, the guide members 134g and 134h are provided in the fourth body portion 134 of the main frame 13. The rail may be described as an example of the guide member. Alternatively, wheels rolling on rails may be used and provided in the sub-frame 14. According to a modification, since the guide members 134g and 134h are provided in the fourth body 134 of the main frame 13, the sub-frame 14 may not be inclined and may be movable only in the axial direction of the rotation shaft 23.

Fig. 5 illustrates an axial sectional view of a compression part and a rotation shaft of a modification of a scroll compressor according to an embodiment of the present disclosure.

With the compression portion 10 according to the modification of the scroll compressor 1, the seal members 141e and 141f configured to seal the gap between the first body portion 141 of the sub frame 14 and the plate 121 of the orbiting scroll 12 are provided in the first body portion 141 of the sub frame 14, instead of the seal members 142c and 142d configured to seal the gap between the second body portion 142 of the sub frame 14 and the fourth body portion 134 of the main frame 13 in the compression portion 10 according to the modification as shown in fig. 2 of the scroll compressor 1. According to a modification, since the sealing members 141c, 141d, 141e, and 141f are provided, by moving the refrigerant of the chamber 142a to the chamber 121b, the pressure of the inside of the chamber 121b can be maintained at a certain intermediate pressure which is the same as the pressure of the inside of the chamber 142 a.

Further, in the modification, the seal members 141c and 141d configured to seal the gap between the sub frame 14 and the main frame 13 and the seal members 141e and 141f configured to seal the gap between the sub frame 14 and the orbiting scroll 12 are provided. However, it should be understood that a sealing member configured to seal a gap between the subframe 14 and at least one member facing the subframe 14 is provided.

As described above, according to an embodiment, the sub frame 14 configured to support the orbiting scroll 12 is provided in the space surrounded by the orbiting scroll 12, the rotation shaft 23, and the main frame 13 to be movable only in the axial direction of the rotation shaft 23 with respect to the main frame 13. Therefore, regardless of the position, the pressure applied from the sub-frame 14 to the orbiting scroll 12 can be equalized, and the thrust load for stabilizing the orbiting scroll 12 can be reduced, thereby improving the efficiency and reliability of the scroll compressor 1.

Further, in an embodiment, the sub-frame 14 is configured to be movable only in a direction along the rotation axis 23 with respect to the main frame 13. However, it does not mean that the sub-frame 14 does not move at all except with respect to the movement of the main frame 13 in the direction along the rotation axis 23. In addition to the movement in the direction of the rotation shaft 23, when rotation about an axis perpendicular to the rotation shaft 23 is not allowed in the middle of rotation about the rotation shaft 23, movement in a direction along the axis perpendicular to the rotation shaft 23 and rotation about the axis perpendicular to the rotation shaft 23, other movement, or rotation may be allowed. Further, it should be understood that the sub-frame 14 may be movable with respect to the main frame 13 in a direction along the rotation axis 23. Further, the sub-frame 14 may be movable in one direction with respect to the main frame 13.

Fig. 6 illustrates an axial cross-sectional view of a scroll compressor according to an embodiment of the present disclosure.

The scroll compressor 2 is a compressor widely used for an air conditioner, a refrigerator, and a heat pump. Fig. 6 shows a longitudinal sectional view of a hermetic scroll compressor used in a refrigerant circuit of an air conditioner.

The scroll compressor 2 includes: a compression part 10 configured to compress a refrigerant; a driving motor 20 configured to drive the compressing part 10; and a housing 30 corresponding to a main body configured to receive the compressing part 10 and the driving motor 20. According to an embodiment, the scroll compressor 2 is a vertical scroll compressor in which an axial direction of a rotating shaft 23 (to be described later) of the driving motor 20 coincides with a direction of gravity. Hereinafter, the axial direction of the rotary shaft 23 will be referred to as "vertical direction", and based on fig. 6, the upper side may be referred to as "upper side" and the lower side may be referred to as "lower side". Although a vertical scroll compressor is described as an example, embodiments of the present disclosure will be applicable to a horizontal scroll compressor.

First, the compression section 10 will be described.

The compressing part 10 may include: a fixed scroll 11 fixed to the housing 30; an orbiting scroll 12 which orbits by engaging with the fixed scroll 11; a main frame 13 fixed to the housing 30 and configured to support the fixed scroll 11; a sub frame 14 disposed between the rotation shaft 23 and the main frame 13 and configured to support the orbiting scroll 12; and an oldham ring 15 configured to allow the orbiting scroll 12 to orbit without pivoting the orbiting scroll 12.

The fixed scroll 11 may include a fixed scroll body and a fixed wrap 114 projecting from the fixed scroll body. The fixed wrap 114 may project downwardly from the fixed scroll body.

The fixed scroll body may include: a cylindrical main body portion 111; a plate 112 configured to cover an opening in an upper side of the main body portion 111; and a protrusion 113 extending in a radially outward direction from a lower end of the body portion 111. The fixed wrap 114 may protrude downward from the lower end of the plate 112 and have a spiral shape when viewed from the bottom.

The fixed scroll 11 may be formed of cast iron, such as gray cast iron FC 250.

The body portion 111 may be provided with a through hole 111a in a radial direction. The through hole 111a may serve as a suction port configured to suck refrigerant into a space surrounded by the body portion 111, the plate 112, and the orbiting scroll 12.

A through hole 112a in the vertical direction is formed at the center of the plate 112. The through hole 112a may serve as a discharge port configured to discharge refrigerant from a space surrounded by the plate 112, the fixed scroll 114, and the orbiting scroll 12.

The fixed scroll 11 configured as described above is fixed to the main frame 13 by a positioning mechanism such as a bolt or a positioning pin passing through a through hole formed in the projection 113 in the vertical direction.

The orbiting scroll 12 may include an orbiting scroll body and an orbiting wrap 122 protruding from the orbiting scroll body to form the compression chamber 16 by engaging with the fixed wrap 114 of the fixed scroll 11. The orbiting scroll 122 may protrude upward from the orbiting scroll body.

The orbiting scroll body may include a plate 121 having a disk shape and a cylindrical body portion 123 protruding downward from a lower end of the plate 121. The orbiting scroll 122 may protrude upward from the upper end of the plate 121 and have a spiral shape when viewed from the top.

The orbiting scroll 12 may be formed of an FC material or an FCD material.

The orbiting wrap 122 of the orbiting scroll 12 may engage with the fixed wrap 114 of the fixed scroll 11. Further, the orbiting lap 122 of the orbiting scroll 12 and the fixed lap 114 of the fixed scroll 11 may be placed in a space formed by the body portion 111 of the fixed scroll 11 and the plate 112 and the plate 121 to form the compression chamber 16. Since the orbiting scroll 122 moves circumferentially around the fixed scroll 114, which is fixed, the volume of the compression chamber 16 is reduced, and the refrigerant of the compression chamber 16 is compressed. In other words, when the inner space between the fixed wrap 114 and the orbiting wrap 122 is decreased toward the rotational center, the refrigerant is compressed.

An eccentric shaft 232 of a rotation shaft 23 described later is inserted into the body portion 123 through a slide bearing. Thus, the body portion 123 serves as a bearing for the eccentric shaft 232.

The main frame 13 is an example of a holding member configured to hold the fixed scroll 11. The main frame 13 may include a cylindrical first body portion 131, a cylindrical second body portion 132 protruding downward from a radially inner side of a lower end of the first body portion 131, and a cylindrical third body portion 133 protruding inward from a lower end of the second body portion 132. In the third body part 133, a through hole 133a into which the rotation shaft 23 is inserted may be provided. The outer circumferential surface of the first body portion 131 of the main frame 13 is fixed to a later-described center housing 31 of the housing 30. According to an embodiment, the main frame 13 does not support a rotation shaft 23 of the driving motor 20, which will be described later.

On an outer peripheral portion of the first body portion 131, a protrusion 131a protruding upward from an upper end surface is mounted. A concave screw is formed in the projection 131a, and a bolt passing through a through hole formed in the projection 113 of the fixed scroll 11 is engaged with the concave screw. Thus, the fixed scroll 11 is mounted to the main frame 13.

On the outer peripheral portion of the first body portion 131, a groove 131b elongated in the vertical direction may be provided. That is, in the first body portion 131, a groove 131b extending in a vertical direction from the center of the outer peripheral portion to the lower portion may be formed. In the first body portion 131, a portion where the groove 131b is formed may be spaced apart from the center housing 31.

The main frame 13 may further include a fixed scroll support surface 11a configured to support the fixed scroll 11. The fixed scroll support surface 11a may be formed on the projection 131 a.

The sub-frame 14 is an example of a support member for supporting the orbiting scroll 12. A gap may be formed between the main frame 13 and the sub-frame 14 to allow the sub-frame 14 to be movable with respect to the main frame 13. In other words, the sub-frame 14 may be arranged within the main frame 13 to be spaced apart from the main frame 13.

The sub-frame 14 may include a cylindrical first body portion 141, a cylindrical second body portion 142 protruding downward from a lower end surface of the first body portion 141, and a cylindrical third body portion 143 protruding downward from an inner end surface of the second body portion 142. The third body portion 143 may have a smaller width than the first and second body portions 141 and 142. Specifically, the width of the inner peripheral surface of the third body portion 143 may be smaller than the width of the inner peripheral surface of the first body portion 141 and the width of the inner peripheral surface of the second body portion 142. The third body portion 143 may be inserted into the shaft through hole 133a to be located between the rotation shaft 23 and the third body portion 133 of the main frame 13. Further, although a journal bearing is interposed therebetween, a later-described rotary shaft 23 of the drive motor 20 is inserted into the interior of the third body portion 143. Therefore, the sub-frame 14 serves as a bearing that rotatably supports the rotating shaft 23. The sub-frame 14 may be configured to be movable with respect to the main frame 13 along at least one of an axial direction of the rotation shaft 23 and a direction perpendicular to the axial direction of the rotation shaft 23. On the other hand, between the outer peripheral surface of the first body portion 141 and the inner peripheral surface of the first body portion 131 of the main frame 13 and between the outer peripheral surface of the third body portion 143 and the inner peripheral surface of the third body portion 133 of the main frame 13, the sub-frame 14 may be disposed between the rotary shaft 23 and the main frame 13 with a gap that allows the sub-frame 14 to be movable with respect to the main frame 13 in the axial direction of the rotary shaft 23 and movable in the rotational direction about a virtual axis substantially perpendicular to the rotary shaft 23.

Further, in a portion formed by the first body portion 131 of the main frame 13 and the third body portion 143 of the sub-frame 14 and a portion formed by the first body portion 131 of the main frame 13 and the first body portion 141 of the sub-frame 14, a first groove 141a and a second groove 141b recessed downward from the upper end surface are formed. In the radial direction, a first groove 141a is formed in the central portion, and a second groove 141b is formed between the first groove 141a and the protrusion 131 a. Further, the body portion 123 of the orbiting scroll 12 is inserted into the first groove 141 a. In the second groove 141b, an oldham ring 15 that prevents the orbiting scroll 12 from pivoting is disposed between the main frame 13 and the orbiting scroll 12.

Further, in the above-described compression portion 10, a discharge passage that discharges the refrigerant compressed in the compression chamber 16 is formed. As for the discharge passage configured to discharge the high-pressure refrigerant, one end thereof is connected to a through hole 112a of the plate 112 (the through hole 112a is configured to discharge the high-pressure refrigerant from the space surrounded by the fixed scroll 11 and the orbiting scroll 12), and the other end thereof is connected to a space in the casing 30 lower than the main frame 13 and also to the chamber 121 a. As for the discharge passage configured to discharge the intermediate-pressure refrigerant, one end thereof is connected to a discharge port configured to discharge the refrigerant from a space having the intermediate-pressure refrigerant and surrounded by the fixed scroll 11 and the orbiting scroll 12, and the other end thereof is connected to the chambers 121b and 142 a.

Since the driving motor 20 and the housing 30 are the same as those previously described, a description thereof will be omitted.

Since the operation of the scroll compressor 2 is also the same as that previously described, a description thereof will be omitted.

On the other hand, in such a scroll compressor 2, the orbiting scroll 12 is inclined due to the compression load of the gas.

Figure 7A is a perspective view illustrating the moment received by the orbiting scroll. As shown in fig. 7A, the orbiting scroll 12 receives a compression load F from the main shaft 231 of the rotation shaft 23 in a direction perpendicular to the eccentric direction of the eccentric shaft 232 on a plane_t. Therefore, in the orbiting scroll 12, a clockwise moment M when viewed from the viewpoint a is generated_S。

Fig. 7B is a view showing a shape in which the orbiting scroll is about to be tilted. Specifically, fig. 7B is a view showing a case where the orbiting scroll 12 is to be tilted when viewed from the viewpoint a of fig. 7A. As shown in fig. 7B, the orbiting scroll 12 receives a compression load Ft and generates a clockwise moment load, and thus the orbiting scroll will be tilted.

In addition, the sub-frame 14 receives lateral loads from the shaft and thus attempts to move in the load direction.

Fig. 8 shows an axial sectional view of the compression portion and the rotation shaft when a moment applied to the sub frame is in the same direction as a moment applied to the orbiting scroll.

Suppose thatSupporting transverse loads F on the axis_MJWith respect to the lateral load F_MJAs opposed to the orbiting scroll 12, as shown in figure 8. For example, assume that reaction force R applied to sub-frame 14 when protrusion 135 of main frame 13 comes into contact with sub-frame 14_MJGenerated in the position shown in fig. 8. Therefore, it is difficult to effectively suppress the inclination of the orbiting scroll 12 because of the moment M applied to the sub-frame 14_FAnd moment M applied to the orbiting scroll 12_SIn the clockwise direction.

Therefore, according to an embodiment, the inclination of the orbiting scroll 12 is suppressed by generating a moment in the opposite direction to the orbiting scroll 12 in the sub frame 14 by the lateral load. This is an example of allowing the sub frame 14 to be movable in a direction opposite to the moment generated in the orbiting scroll 12 among the rotational directions about the virtual axis substantially orthogonal to the rotation shaft 23.

Fig. 9 shows an axial sectional view of the compression portion and the rotation shaft when a moment applied to the sub frame is in a direction opposite to a moment applied to the orbiting scroll.

According to one embodiment, it is assumed that the supporting lateral load F on this axis_MJWith respect to the lateral load F_MJOn the same side as the orbiting scroll 12, as shown in figure 9. For example, assume that reaction force R applied to sub-frame 14 when protrusion 136 formed in the inner peripheral surface of main frame 13 comes into contact with sub-frame 14_MJGenerated in the position shown in fig. 9. Therefore, the inclination of the orbiting scroll 12 can be effectively suppressed because the moment M applied to the sub-frame 14_FIn the counter-clockwise direction. This is an example in which the reaction force of the holding member against the load received by the orbiting scroll is received at a predetermined position on the orbiting scroll side rather than the position in the rotating shaft receiving the load. Generating a reaction force R applied to the sub-frame 14_MJMay be between L1 and L2 as shown in fig. 9. L1 is the position of the tip end surface of third body portion 143 of sub-frame 14 on the side of orbiting scroll 12. When the end surface is inclined, it may be the lowest position of the end surface. L1 is the rotation of the support member on the orbiting scroll sideExamples of the position of the end surface of the shaft bearing. Further, L2 is the position of the surface of the orbiting scroll 122 on which the plate 121 of the orbiting scroll 12 is formed. In other words, the plate 121 of the orbiting scroll 12 may include an orbiting wrap forming surface 121aa on which the orbiting wrap 122 is formed, and L2 is a location of the orbiting wrap forming surface 121 aa. When this surface is inclined, it may be the uppermost position of the surface. L2 is an example of the location of the surface on which the plate of the orbiting scroll engages the fixed scroll.

Further, in order to generate a reaction force R applied to the sub-frame 14 at the position shown in fig. 9_MJWhen the orbiting scroll 12 is about to be tilted, the first body portion 131 of the main frame 13 and the first body portion 141 of the sub frame 14 may be contacted before the third body portion 133 of the main frame 13 and the third body portion 143 of the sub frame 14 are contacted. That is, when the sub-frame 14 is inclined due to the motion, the protrusion 136 of the main frame 13 and the first body portion 141 of the sub-frame 14 may be contacted before the third body portion 133 of the main frame 13 and the third body portion 143 of the sub-frame 14 are contacted. More specifically, when the thrust surface of the sub-frame 14 supporting the orbiting scroll 12 is substantially parallel to the thrust surface of the fixed scroll 11, the first body portion 131 of the main frame 13 and the first body portion 141 of the sub-frame 14 may be in contact before the third body portion 133 of the main frame 13 and the third body portion 143 of the sub-frame 14 are in contact.

For this reason, the gap between first body portion 131 of main frame 13 and first body portion 141 of sub-frame 14 is smaller than the gap between third body portion 133 of main frame 13 and third body portion 143 of sub-frame 14. This is an example in which, with respect to a position that receives a load about the rotation shaft, the minimum clearance with the retainer member on the same side as the orbiting scroll is smaller than the minimum clearance with the retainer member on the opposite side to the orbiting scroll. The gap between the first body portion 131 of the main frame 13 and the first body portion 141 of the sub-frame 14 may be located between L1 and L2, as shown in fig. 9. L1 is the position of the tip end surface of third body portion 143 of sub-frame 14 on the side of orbiting scroll 12. When the end surface is inclined, it may be the lowest position of the end surface. L1 is an example of the position of the tip end surface of the rotation shaft bearing of the orbiting scroll side support member. Further, L2 is the position of the surface of the orbiting scroll 122 on which the plate 121 of the orbiting scroll 12 is formed. When this surface is inclined, it may be the uppermost position of the surface. L2 is an example of the location of the surface on which the plate of the orbiting scroll engages the fixed scroll.

Further, according to an embodiment, as shown in fig. 9, sub-frame 14 may include a thrust bearing 144, thrust bearing 144 having an orbiting scroll support surface 144a that supports orbiting scroll member 12. The thrust bearing 144 may have an elastically deformable shape. Specifically, the outer peripheral side of the thrust bearing 144 of the sub frame 14 may be inclined, and therefore the thrust bearing 144 of the sub frame 14 may be elastically deformed when being in contact with one surface of the orbiting scroll 12 on which the orbiting scroll 12 is not formed. In this way, the thrust load is distributed to suppress local contact. However, the shape of the thrust bearing 144 shown in fig. 9 is not limited thereto, and thus the thrust bearing 144 may have various shapes as long as it is elastically deformed. The thrust bearing 144 is an example of a part of a support member for supporting the orbiting scroll, and the shape of the thrust bearing 144 of fig. 9 is an example of a shape elastically deformed when contacting a surface on which a plate of the orbiting scroll is not engaged with the fixed scroll due to the inclination of the orbiting scroll.

Next, an implementation of the oldham ring 15 of the scroll compressor 2 according to an embodiment will be described.

Fig. 10 illustrates an axial sectional view of a compression part and a rotation shaft according to an implementation example of a scroll compressor.

The compression portion 10 according to one implementation of the scroll compressor 2 may include a fixed scroll 11, an orbiting scroll 12, a main frame 13, a sub frame 14, and an oldham ring 15 as shown in fig. 1. In one implementation, an oldham ring 15 is coupled to, or engages, orbiting scroll member 12 and sub-frame 14. Specifically, a pair of (two pieces of) oldham ring guide grooves 121g are formed substantially straight on the lower surface of the plate 121 of the orbiting scroll 12. A pair (two-piece) of key portions 15b formed on the upper surface of the annular portion 15a of the oldham ring 15 may be slidably coupled to or engaged with the oldham ring guide groove 121 g. Further, a pair (two pieces) of oldham ring guide grooves 141g having a phase difference of about 90 ° from the oldham ring guide groove 121g of the orbiting scroll 12 is formed substantially straight on the upper surface of the first body portion 141 of the sub-frame 14. A pair (two-piece) of key portions 15c formed on the lower surface of the annular portion 15a of the oldham ring 15 may be slidably coupled to or engaged with the oldham ring guide groove 141 g. With the oldham ring 15 configured as described above, the orbiting scroll 12 can perform an orbiting motion without pivoting.

Fig. 11 illustrates an axial sectional view of a compression part and a rotation shaft according to an implementation of a scroll compressor.

The compression portion 10 according to one implementation of the scroll compressor 2 may include a fixed scroll 11, an orbiting scroll 12, a main frame 13, a sub frame 14, and an oldham ring 15 as shown in fig. 1. In one implementation, an oldham ring 15 is coupled to, or engages, orbiting scroll member 12 and sub-frame 14. Specifically, a pair of (two pieces of) oldham ring guide grooves 121g are formed substantially straight on the lower surface of the plate 121 of the orbiting scroll 12. A pair (two-piece) of key portions 15b formed on the upper surface of the annular portion 15a of the oldham ring 15 may be slidably coupled to or engaged with the oldham ring guide groove 121 g. Further, a pair (two pieces) of oldham ring guide grooves 131g having a phase difference of about 90 ° from the oldham ring guide grooves 121g of the orbiting scroll 12 are formed substantially straight on the upper surface of the first body portion 131 of the main frame 13. A pair (two-piece) of key portions 15d formed on the lower surface of the annular portion 15a of the oldham ring 15 may be slidably coupled to or engaged with the oldham ring guide groove 131 g. With the oldham ring 15 configured as described above, the orbiting scroll 12 can perform an orbiting motion without pivoting.

Fig. 12 illustrates an axial sectional view of a compression part and a rotation shaft according to an implementation of a scroll compressor.

The compression portion 10 according to one implementation of the scroll compressor 2 may include a fixed scroll 11, an orbiting scroll 12, a main frame 13, a sub frame 14, and an oldham ring 15 as shown in fig. 1. In one implementation, the oldham ring 15 is coupled to or engages both the orbiting scroll 12 and the fixed scroll 11. Specifically, a pair of (two pieces of) oldham ring guide grooves 121g are formed substantially straight on the lower surface of the plate 121 of the orbiting scroll 12. A pair (two-piece) of key portions 15b formed on the upper surface of the annular portion 15a of the oldham ring 15 may be slidably coupled to or engaged with the oldham ring guide groove 121 g. Further, a pair (two pieces) of oldham ring guide grooves 112g having a phase difference of about 90 ° from the oldham ring guide groove 121g of the orbiting scroll 12 are formed substantially straight on the lower surface of the plate 112 of the fixed scroll 11. A pair (two-piece) of key portions 15e formed on the upper surface of the annular portion 15a of the oldham ring 15 may be slidably coupled to the oldham ring guide groove 112g or engaged with the oldham ring guide groove 112 g. With the oldham ring 15 configured as described above, the orbiting scroll 12 can perform an orbiting motion without pivoting.

However, in the configuration in which the sub frame 14 supporting the orbiting scroll 12 is movable only in the direction along the rotation axis 23, it is difficult to control the moment applied to the sub frame 14, and therefore it is only possible to follow this tendency. Therefore, it is difficult to efficiently select the position of the lower thrust reaction force, and therefore the effect is not obtained. According to an embodiment, the location of the lower thrust reaction force may be effectively selected, thereby maximizing the effect.

In some embodiments, the space surrounded by the main frame 13 and the sub-frame 14 is formed by two seal members between the main frame 13 and the sub-frame 14. By directing a certain pressure (intermediate pressure) from the compression chamber 16 during a compression operation in this space, the sub-frame 14 may be urged against the orbiting scroll member 12. As for its implementation, two methods can be mainly used, and will be described in detail by some variations.

Fig. 13 illustrates an axial sectional view of a compression part and a rotation shaft of a modification of a scroll compressor according to an embodiment of the present disclosure. In other words, fig. 13 shows an axial sectional view of the compression portion 10 and the rotary shaft 23 according to a modification of the scroll compressor 2.

The compression portion 10 according to the modification of the scroll compressor 2 may include a fixed scroll 11, an orbiting scroll 12, a main frame 13, and a sub frame 14 as shown in fig. 6. The orbiting scroll 12 orbits by engaging with the fixed scroll 11 to form a compression chamber 16. The compression chamber 16 sucks and compresses a low-pressure refrigerant as indicated by an arrow in the through hole 111a in the radial direction, and discharges a high-pressure refrigerant as indicated by an arrow in the through hole 112a in the vertical direction. Description of the oldham ring 15 will be omitted.

In the compression portion 10, a seal member 171a configured to seal a gap between the body portion 123 of the orbiting scroll 12 and the third body portion 143 of the sub-frame 14 is provided. According to a variant, by providing the sealing member 171a, the chamber 171 is formed and the chamber 171 is maintained at a high pressure.

Further, seal members 172a and 172b configured to seal a gap between the main frame 13 and the sub-frame 14 may be provided in the compression portion 10 so as to form a chamber 172 between the main frame 13 and the sub-frame 14. A sealing member 172a configured to seal a gap between the second body portion 132 of the main frame 13 and the first body portion 141 of the sub-frame 14 is provided, and at the same time, a sealing member 172b configured to seal a gap between the third body portion 133 of the main frame 13 and the third body portion 143 of the sub-frame 14 is provided. These seal members 172a and 172b correspond to the two seal members described above. According to a variant, the chamber 172 is formed by providing sealing members 172a and 172 b.

Further, in the compression part 10, refrigerant passages 181, 182, and 183 configured to guide the refrigerant discharged from the compression chamber 16 to the chamber 172 may be provided. Specifically, in the compression section 10, a first passage 181, a second passage 182, and a third passage 183 configured to guide refrigerant at a certain pressure from the compression chamber 16 to the chamber 172 are provided. A first passage 181 may be provided in the orbiting scroll 12 to communicate with the compression chamber 16. The first passage 181 is a passage that passes through the interior of the orbiting scroll 12, and is an example of an interior passage of the orbiting scroll. The first passage 181 moves the refrigerant out of the compression chamber 16 and introduces the refrigerant into the second passage 182. A second passage 182 may be provided in the fixed scroll 11 to connect the first passage 181 to the third passage 183. The second passage 182 is a passage that passes through the fixed scroll 11, and is an example of an internal passage of the fixed scroll. The second passage 182 moves the refrigerant introduced from the first passage 181 and introduces the refrigerant into the third passage 183. A third passage 183 may be provided in the main frame 13 to communicate with the chamber 172. The third passage 183 is a passage passing through the main frame 13, and is an example of an internal passage of the holding member. The third passage 183 moves the refrigerant introduced from the second passage 182 and introduces the refrigerant into the chamber 172. Thus, the pressure in chamber 172 is maintained at a particular intermediate pressure.

Fig. 14 is a plan view illustrating an end of a plate of an orbiting scroll in a compression part when viewed from the top according to a modification of a scroll compressor according to an embodiment of the present disclosure. In other words, fig. 14 shows a plan view of the end of the plate 121 of the orbiting scroll 12 when viewed from the top.

Among the upper regions of the plate 121, an inlet 181a of the first passage 181 is provided in a region 125a (a region on the right side of the broken-line circular arc) facing the compression chamber 16, and an outlet 181b of the first passage 181 is provided in a region 125b (a region on the left side of the broken-line circular arc) in contact with the body portion 111 of the fixed scroll 11. The first passage 181 is not actually visible when the plate 121 is viewed from the top, but for clarity the first passage 181 is shown in the figure in dashed lines. Further, the inlet 181a of the first passage 181 is shown to be disposed in a region fitted in the two orbiting scrolls 122 outermost and adjacent to each other, but the position of the inlet 181a is not limited thereto. Thus, the location of inlet 181a may be selected based on the magnitude of the intermediate pressure to be directed to chamber 172. Accordingly, the desired intermediate-pressure refrigerant in the compression chamber 16 flows to the first passage 181.

Fig. 15 is a bottom view illustrating a body portion of a fixed scroll in a compression part when viewed from the bottom according to a modification of the scroll compressor according to an embodiment of the present disclosure. In other words, fig. 15 shows a bottom view of the body portion 111 of the fixed scroll 11 when viewed from the bottom.

Among the lower area of the body portion 111, the inlet 182a of the second passage 182 is provided in the area 115a (the area on the right side of the broken-line circular arc) in contact with the plate 121 of the orbiting scroll 12, and the outlet 182b of the second passage 182 is provided in the area 115b (the area on the left side of the broken-line circular arc) in contact with the main frame 13. The second passage 182 is not actually visible when the body portion 111 of the fixed scroll 11 is viewed from the bottom, but for clarity the second passage 182 is shown in phantom in the drawings. Further, in a modification, the inlet 182a of the second passage 182 is provided in a point on the locus 181c of the outlet 181b of the first passage 181 when the orbiting scroll 12 orbits. Accordingly, a certain range of intermediate-pressure refrigerant in the compression chamber 16, which the inlet 181a faces, flows from the first passage 181 to the second passage 182.

Fig. 16 illustrates an axial sectional view of a compression part and a rotation shaft of a modification of a scroll compressor according to an embodiment of the present disclosure. In other words, fig. 16 shows an axial sectional view of the compression portion 10 and the rotary shaft 23 according to a modification of the scroll compressor 2.

The compression portion 10 according to the modification of the scroll compressor 2 may further include a counter bore (counter bore)184 disposed between the first passage 181 and the second passage 182, as compared to the compression portion 10 according to the modification of the scroll compressor 2 shown in fig. 13.

Since the top view of the end of the plate 121 of the orbiting scroll 12 when viewed from the top has been described previously, the description thereof will be omitted.

Fig. 17 is a bottom view illustrating a body portion of a fixed scroll in a compression part when viewed from the bottom according to a modification of the scroll compressor according to an embodiment of the present disclosure.

Among the lower area of the body portion 111, the inlet 182a of the second passage 182 is provided in the area 115a (the area on the right side of the broken-line circular arc) in contact with the plate 121 of the orbiting scroll 12, and the outlet 182b of the second passage 182 is provided in the area 115b (the area on the left side of the broken-line circular arc) in contact with the main frame 13. The second passage 182 is not actually visible when the body portion 111 of the fixed scroll 11 is viewed from the bottom, but for clarity the second passage 182 is shown in phantom in the drawings. Further, in a modification, the inlet 182a of the second passage 182 is provided in contact with a counterbore 184, which counterbore 184 corresponds to an example of a groove portion that covers the entirety of the locus 181c of the outlet 181b of the first passage 181 as the orbiting scroll 12 orbits. Accordingly, the intermediate-pressure refrigerant in the compression chamber 16, which the inlet 181a faces, flows from the first passage 181 to the second passage 182.

According to a modification, the inlet 182a of the second passage 182 is provided in contact with a counterbore 184, the counterbore 184 covering the entirety of the locus 181c of the outlet 181b of the first passage 181 when the orbiting scroll member 12 orbits, but not limited thereto. Alternatively, an inlet 182a of second passage 182 is provided in contact with a counterbore 184, which counterbore 184 covers a portion of the locus 181c of outlet 181b of first passage 181 as orbiting scroll member 12 orbits. That is, the inlet 182a of the second passage 182 may communicate with the outlet 181b of the first passage 181 during at least a portion of the period in which the orbiting scroll 12 orbits.

Further, according to some modifications, it is assumed that a first passage 181 configured to move refrigerant out of the compression chamber 16 and introduce the refrigerant into a second passage 182 in the fixed scroll 11 is provided in the orbiting scroll 12, and a second passage 182 configured to introduce the refrigerant introduced from the first passage 181 in the orbiting scroll 12 into a third passage 183 in the main frame 13 is provided in the fixed scroll 11, but not limited thereto. Alternatively, it may be assumed that a passage configured to move refrigerant out of the compression chamber 16 and introduce the refrigerant directly into the third passage 183 of the main frame 13 is provided in the fixed scroll 11. By using the above configuration, control of communication timing between the first passage 181 and the second passage 182, which is mentioned in some variations, may not be required.

Further, according to some modifications, assuming that the main frame 13 and the sub-frame 14 are shaped as shown in fig. 6, 10, and 12, a chamber 172 configured to introduce an intermediate pressure from the compression chamber 16 to the chamber 172 is formed between the main frame 13 and the sub-frame 14 by sealing a gap between the main frame 13 and the sub-frame 14 using seal members 172a and 172b, but is not limited thereto. For example, assuming that the main frame 13 and the sub-frame 14 are shaped as shown in fig. 11, a chamber is formed between the main frame 13 and the sub-frame 14 by sealing a gap between the main frame 13 and the sub-frame 14 using two seal members, which may be configured to introduce an intermediate pressure from the compression chamber 16 to the chamber.

Alternatively, when the chamber 142a of fig. 2 to 4 corresponds to the chamber 172 of fig. 13 to 16 assuming the shape of the main frame 13 and the sub-frame 14 according to an embodiment, an intermediate pressure may be introduced from the compression chamber 16 to the chamber 172. Further, when it is assumed that the space formed by the chamber 142a and the chamber 121b of fig. 5 corresponds to the chamber 172 of fig. 13 to 16, intermediate pressure may be introduced from the compression chamber 16 to the chamber 172.

In this sense, it should be understood that the introduction of the intermediate pressure from the compression chamber 16 to the chamber 172 by forming the chamber 172 between the main frame 13 and the sub-frame 14 by sealing the gap between the main frame 13 and the sub-frame 14 using the seal members 172a and 172b may include: the intermediate pressure is introduced from the compression chamber 16 to the chamber 172 by forming an inner space at least between the main frame 13 and the sub-frame 14 and by sealing at least the gap between the main frame 13 and the sub-frame 14 using a sealing mechanism.

While the present disclosure has been described in terms of various embodiments, various alterations and modifications may be suggested to one skilled in the art. The present disclosure is intended to embrace such alterations and modifications as fall within the scope of the appended claims.