阅读说明：本技术 涡旋式压缩机及包括该涡旋式压缩机的制冷装置 (Scroll compressor and refrigerating device comprising same ) 是由 永原显治 于 2020-04-15 设计创作，主要内容包括：机架(21)具有：轴承部(22)；与轴承部(22)相连并朝径向外侧延伸的主体部(23)；在主体部(23)的径向外侧压接在机壳(10)上的压接部(24)；以及向静涡旋盘(30)延伸的支承部(25)。支承部(25)的位于静涡旋盘(30)侧的端面是供静涡旋盘(30)紧固的紧固面(25a)。主体部(23)及支承部(25)的外周面与机壳(10)的内周面之间形成有间隙(G1)。间隙(G1)的轴向长度(L1)在支承部(25)的内周面的轴向长度(L2)以上。(The frame (21) has: a bearing section (22); a main body part (23) connected to the bearing part (22) and extending radially outward; a press-contact section (24) which is pressed against the housing (10) on the radially outer side of the main body section (23); and a support portion (25) extending toward the fixed scroll (30). The end surface of the support portion (25) on the fixed scroll (30) side is a fastening surface (25a) to which the fixed scroll (30) is fastened. A gap (G1) is formed between the outer peripheral surfaces of the main body part (23) and the support part (25) and the inner peripheral surface of the casing (10). The axial length (L1) of the gap (G1) is equal to or greater than the axial length (L2) of the inner circumferential surface of the support part (25).)

1. A scroll compressor characterized in that:

the scroll compressor comprises a cylindrical casing (10), a compression mechanism (20) and a drive shaft (60),

the compression mechanism (20) is housed in the casing (10), and has a fixed scroll (30), a movable scroll (40), and a frame (21),

the driving shaft (60) is used for driving the movable scroll (40) to rotate,

the frame (21) has a bearing portion (22), a main body portion (23), a press-contact portion (24), and a support portion (25),

the bearing section (22) supports the drive shaft (60), and the drive shaft (60) is rotatable,

the main body part (23) is connected to the bearing part (22), and the main body part (23) extends radially outward,

the crimping part (24) is arranged at the radial outer side of the main body part (23) and is crimped on the shell (10),

the support portion (25) extends from a surface of the main body portion (23) located on the fixed scroll (30) side in the axial direction toward the fixed scroll (30),

the end surface of the support portion (25) on the fixed scroll (30) side is a fastening surface (25a) to which the fixed scroll (30) is fastened,

a gap (G1) is formed between the outer peripheral surfaces of the main body part (23) and the support part (25) and the inner peripheral surface of the housing (10),

the axial length (L1) of the gap (G1) is equal to or greater than the axial length (L2) of the inner peripheral surface of the support portion (25).

2. The scroll compressor of claim 1, wherein:

the axial length (L1) of the gap (G1) is longer than the axial length (L2) of the inner peripheral surface of the support portion (25).

3. The scroll compressor of claim 1 or 2, wherein:

the frame (21) has a welding part (26) welded on the casing (10),

at least a part of the crimping part (24) and at least a part of the welding part (26) are juxtaposed in a circumferential direction of the casing (10).

4. The scroll compressor of claim 3, wherein:

the welding part (26) communicates with an inner space (S1) of the cabinet (10) via the gap (G1).

5. A refrigeration device, characterized by:

the refrigeration device comprises a scroll compressor (1) as claimed in any one of claims 1 to 4.

Technical Field

The present disclosure relates to a scroll compressor and a refrigeration apparatus including the same.

Background

Conventionally, there is known a scroll compressor including a casing and a compression mechanism having a fixed scroll and a frame (housing) (for example, patent document 1). In the scroll compressor of this document, the frame has a crimping portion crimped on the casing, and a bearing portion connected to the crimping portion and extending in the axial direction. The fixed scroll side end surface of the bearing portion is a fastening surface to which the fixed scroll is fastened.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2017-25762

Disclosure of Invention

Technical problems to be solved by the invention

Since the press-contact portion is press-contacted to the housing, there is a possibility that the position of the support portion connected to the press-contact portion may fluctuate before and after the housing is fixed with respect to the housing. If this variation is large, the sealing performance between the fixed scroll and the fastening surface of the bearing portion is reduced, and the efficiency of the scroll compressor is reduced.

The purpose of the present disclosure is: the efficiency of the scroll compressor is improved.

Technical solution for solving technical problem

A first aspect of the present disclosure is directed to a scroll compressor 1. The scroll compressor 1 includes a cylindrical casing 10, a compression mechanism 20, and a drive shaft 60, the compression mechanism 20 being housed in the casing 10 and having a fixed scroll 30, a movable scroll 40, and a frame 21, the drive shaft 60 being for driving the movable scroll 40 to rotate, the frame 21 having a bearing portion 22, a body portion 23, a pressure contact portion 24, and a support portion 25, the bearing portion 22 supporting the drive shaft 60 and the drive shaft 60 being rotatable, the body portion 23 being connected to the bearing portion 22 and the body portion 23 extending radially outward, the pressure contact portion 24 being provided radially outward of the body portion 23 and being in pressure contact with the casing 10, the support portion 25 extending from a face of the body portion 23 on the fixed scroll 30 side in the axial direction toward the fixed scroll 30, an end face of the support portion 25 on the fixed scroll 30 side being a fastening face 25a to which the fixed scroll 30 is fastened, a gap G1 is formed between the outer peripheral surfaces of the main body portion 23 and the support portion 25 and the inner peripheral surface of the housing 10, and an axial length L1 of the gap G1 is equal to or greater than an axial length L2 of the inner peripheral surface of the support portion 25.

In the first aspect, the radial pressing force acting on the crimping part 24 from the casing 10 is reliably received by the main body part 23 extending in the radial direction. The positional variation of the support portion 25 is suppressed, and the sealability between the fastening surface 25a and the fixed scroll 30 is improved. This can improve the efficiency of the scroll compressor 1.

A second aspect of the present disclosure is characterized in that, on the basis of the first aspect: the axial length L1 of the gap G1 is longer than the axial length L2 of the inner circumferential surface of the support portion 25.

In the second aspect, the positional variation of the bearing portion 25 can be further suppressed, and the sealing property between the fastening surface 25a and the fixed scroll 30 can be further improved. This can further improve the efficiency of the scroll compressor 1.

A third aspect of the present disclosure is, on the basis of the first or second aspect, characterized in that: the frame 21 has a welding portion 26 welded to the casing 10, and at least a part of the crimping portion 24 and at least a part of the welding portion 26 are juxtaposed in a circumferential direction of the casing 10.

In the third aspect, the frame 21 can be downsized in the axial direction, and further the scroll compressor 1 can be downsized, as compared with the case where the crimping portions 24 and the welding portions 26 are arranged side by side in the axial direction.

A fourth aspect of the present disclosure is, on the basis of the third aspect, characterized in that: the welding part 26 communicates with the inner space of the cabinet 10 through the gap G1.

In the fourth aspect, when the frame 21 is welded to the housing 10, the welding gas escapes to the internal space of the housing 10 through the gap G1, and the occurrence of a welding failure can be suppressed.

A fifth aspect of the present disclosure is directed to a refrigeration apparatus 100. The refrigeration apparatus 100 includes the scroll compressor 1 of any one of the first to fourth aspects.

Drawings

Fig. 1 is a refrigerant circuit diagram showing a schematic configuration of a refrigeration apparatus according to an embodiment.

Fig. 2 is a longitudinal sectional view of a scroll compressor in an embodiment.

Fig. 3 is a longitudinal sectional view showing a main portion of a scroll compressor in the embodiment.

Fig. 4 is a perspective view showing a main part of the chassis in the embodiment.

Fig. 5 is a schematic plan view of a scroll compressor according to the embodiment.

Detailed Description

The embodiments will be explained. The scroll compressor 1 of the present embodiment is applied to the refrigeration apparatus 100. The refrigeration apparatus 100 includes an air conditioner that adjusts the temperature and humidity of air, a cooling device in a cooling compartment, a hot water supply device that generates hot water, and the like.

As shown in fig. 1, the refrigeration apparatus 100 includes a refrigerant circuit 101 that performs a refrigeration cycle. The refrigerant circuit 101 includes the scroll compressor 1, a condenser 102, an expansion mechanism 103, and an evaporator 104. In the refrigerant circuit 101, the refrigerant compressed by the scroll compressor 1 is released in the condenser 102 and then decompressed by the expansion mechanism 103. The refrigerant after pressure reduction is evaporated in the evaporator 104 and then sucked into the scroll compressor 1.

As shown in fig. 2 and 3, the scroll compressor 1 includes a casing 10, a compression mechanism 20, a motor 50, and a drive shaft 60.

The casing 10 is formed in a cylindrical shape having a long longitudinal length and both closed ends. The compression mechanism 20 and the motor 50 are housed in the casing 10 in this order from the upper side. The compression mechanism 20 and the motor 50 are coupled by a drive shaft 60 extending in the axial direction (vertical direction) in the casing 10.

The casing 10 is provided with a suction pipe 11 and a discharge pipe 12. The suction pipe 11 axially penetrates the upper portion of the casing 10 and is connected to the compression mechanism 20. The suction pipe 11 introduces a low-pressure fluid (e.g., a gaseous refrigerant) to the compression mechanism 20. The discharge pipe 12 radially penetrates the body of the casing 10 and communicates with the internal space of the casing 10. The discharge pipe 12 guides the high-pressure fluid inside the casing 10 to the outside of the casing 10.

The compression mechanism 20 is housed in the casing 10. The compression mechanism 20 is configured to: the fluid introduced through the suction pipe 11 is compressed and discharged into the cabinet 10. The configuration of the compression mechanism 20 will be described in detail later.

The motor 50 is housed in the casing 10 and disposed below the compression mechanism 20. The motor 50 has a stator 51 and a rotor 52. The stator 51 is formed in a substantially cylindrical shape and fixed to the housing 10. The rotor 52 is inserted into the inner periphery of the stator 51 and is rotatable. The drive shaft 60 is inserted into and fixed to the inner periphery of the rotor 52.

The drive shaft 60 has a main shaft portion 61 and an eccentric shaft portion 62. The main shaft portion 61 extends in the axial direction (vertical direction) of the housing 10. The eccentric shaft portion 62 is provided at the upper end of the main shaft portion 61. The outer diameter of the eccentric shaft portion 62 is smaller than the outer diameter of the main shaft portion 61. The axis of the eccentric shaft 62 is eccentric by a predetermined distance from the axis of the main shaft 61.

Next, the structure of the compression mechanism 20 will be described with reference to fig. 2 to 5.

As shown in fig. 2 and 3, the compression mechanism 20 includes a frame 21, a fixed scroll 30, and a movable scroll 40. The housing 21 is disposed inside the cabinet 10. The fixed scroll 30 is fixed to the frame 21. The orbiting scroll 40 is disposed between the frame 21 and the fixed scroll 30. The orbiting scroll 40 is configured to mesh with the fixed scroll 30 and perform eccentric orbiting motion with respect to the fixed scroll 30.

The housing 21 is fixed in the casing 10, and divides an inner space of the casing 10 into two spaces in an axial direction. The space on the upper side of the frame 21 constitutes a first space S1. The space on the lower side of the chassis 21 constitutes a second space S2. The first space S1 constitutes an internal space.

The frame 21 is fixed on the inner circumferential surface of the casing 10. As shown in fig. 3 and 4, the housing 21 includes a bearing portion 22, a body portion 23, a pressure-contact portion 24, a support portion 25, and a welding portion 26.

The bearing portion 22 is a substantially cylindrical portion. The bearing portion 22 supports the drive shaft 60, and the drive shaft 60 is rotatable. An elastic groove 22a capable of elastically deforming the bearing portion 22 is formed on the upper surface of the bearing portion 22.

The main body portion 23 is a portion that is continuous with the bearing portion 22 and extends radially outward. The body portion 23 is formed in a thick cylindrical shape. The radial thickness of the body portion 23 is thicker than the radial thickness of the support portion 25.

The crimping portion 24 is a portion provided radially outside the main body portion 23. The outer peripheral surface of the press contact portion 24 constitutes a part of the outer peripheral surface of the frame 21. The axial length (vertical length) of the crimping portion 24 is shorter than the axial length of the frame 21. The crimping portion 24 is crimped and fixed to the trunk portion of the casing 10.

The support portion 25 is a portion extending from the upper surface of the main body portion 23 (in other words, a surface of the main body portion 23 on the fixed scroll 30 side in the axial direction of the casing 10) toward the fixed scroll 30. The support portion 25 is formed in a cylindrical shape having a slightly smaller thickness. An upper end surface of the support portion 25 (in other words, an end surface of the support portion 25 on the fixed scroll 30 side) is a fastening surface 25a to which the fixed scroll 30 is fastened.

The welded portion 26 is formed by a recess 27 formed on the outer peripheral surface of the frame 21. A welding pin 28 is provided in the recess 27. The welding pin 28 is melted by welding through the welding through hole 13 formed in the housing 10, and fixes the frame 21 and the housing 10 to each other.

A plurality of (two in this example) welding portions 26 (fig. 3) are provided in the axial direction of the casing 10. A plurality of (four in this example) welding portions 26 (fig. 5) are provided in the circumferential direction of the casing 10.

A first gap G1 is formed between the outer peripheral surface of the chassis 21 (specifically, the main body portion 23 and the support portion 25) and the inner peripheral surface of the casing 10 above the press-contact portion 24. A second gap G2 is formed between the outer peripheral surface of the fixed scroll 30 and the inner peripheral surface of the casing 10. The outer peripheral surface of the fixed scroll 30 is substantially flush with the outer peripheral surface of the support portion 25. The first gap G1 and the second gap G2 communicate the upper welding portion 26 with the first space S1. The first gap G1 constitutes a gap.

Axial length L1 of first gap G1 is longer than axial length L2 of the inner circumferential surface of support portion 25. In other words, the axial distance between the upper end surface (fastening surface 25a) of the support portion 25 and the upper end of the pressure-bonding section 24 is longer than the axial distance between the upper end surface of the support portion 25 and the upper surface of the body portion 23. Alternatively, the upper end of the pressure contact part 24 is located below the upper surface of the body 23. The lower end of the pressure-bonding section 24 is located above the lower surface of the body 23. Therefore, the entire crimping portion 24 is juxtaposed with the main body portion 23 in the radial direction of the casing 10.

A third gap G3 is formed between the outer peripheral surface of the chassis 21 (specifically, the main body portion 23) and the inner peripheral surface of the casing 10 below the press-contact portion 24. The third gap G3 communicates the lower-side welded portion 26 with the second space S2.

As shown in fig. 3 and 4, at least a part of the crimping part 24 and at least a part of the welding part 26 (recess 27) are arranged side by side with each other in the circumferential direction of the casing 10. At least a part of the crimping part 24 and at least a part of the welding part 26 (recess 27) are close to each other in the circumferential direction of the casing 10. At least a part of the crimping portion 24 and at least a part of the welding portion 26 (recess 27) are arranged substantially adjacent to each other in the circumferential direction of the casing 10.

At least a part of the crimping portion 24 and at least a part of the welding portion 26 (recess 27) are arranged side by side with each other in the axial direction of the casing 10. At least a part of the crimping portion 24 and at least a part of the welding portion 26 (recess 27) are close to each other in the axial direction of the casing 10. At least a part of the crimping portion 24 and at least a part of the welding portion 26 (recess 27) are arranged substantially adjacent to each other in the axial direction of the casing 10.

Therefore, at least a part of the crimping part 24 and at least a part of the welding part 26 (the recess 27) are arranged side by side with each other in the circumferential direction and the axial direction of the casing 10. At least a part of the pressure contact part 24 and at least a part of the welding part 26 (recess 27) are close to each other in the circumferential direction and the axial direction of the casing 10. At least a part of the crimping portion 24 and at least a part of the welding portion 26 (recess 27) are arranged substantially adjacent to each other in the circumferential direction and the axial direction of the casing 10. Thereby, the casing 10 and the chassis 21 are more firmly fixed to each other.

The fixed scroll 30 is arranged on one side (upper side in this example) in the axial direction of the frame 21. The fixed scroll 30 has a fixed-side end plate 31, a fixed-side wrap 32, and an outer circumferential wall 33.

The stationary-side end plate 31 is formed in an approximately circular plate shape. The fixed wrap 32 is formed in a spiral wall shape drawing an involute curve, and protrudes from a front surface (a lower surface in this example) of the fixed end plate 31. Outer circumferential wall 33 is formed to surround the outer circumferential side of stationary wrap 32 and projects from the front surface of stationary end plate 31. The lower surface of the outer peripheral wall portion 33 is fastened to the fastening surface 25a of the support portion 25. A front end surface (a lower end surface in this example) of the fixed-side wrap 32 is substantially flush with a front end surface of the outer circumferential wall portion 33.

An intake port (not shown) is formed in the outer peripheral wall 33 of the fixed scroll 30. The suction port is connected to the downstream end of the suction pipe 11. A discharge port 34 penetrating the stationary end plate 31 in the thickness direction is formed in the center of the stationary end plate 31 of the stationary scroll 30.

The orbiting scroll 40 has an orbiting side end plate 41, an orbiting side wrap 42, and a flange portion 43.

The movable-side end plate 41 is formed in an approximately circular plate shape. The orbiting wrap 42 is formed in a spiral wall shape drawing an involute curve, and protrudes from a front surface (an upper surface in this example) of the orbiting end plate 41. The flange portion 43 is formed in a cylindrical shape and is disposed at a central portion of the back surface (lower surface in this example) of the moving-side end plate 41. The orbiting wrap 42 of the orbiting scroll 40 meshes with the stationary wrap 32 of the stationary scroll 30.

According to the above configuration, the compression chamber S20 is formed between the fixed scroll 30 and the orbiting scroll 40. The compression chamber S20 is a space for compressing the fluid. The compression chamber S20 is configured to: compresses the fluid sucked through the suction port from the suction pipe 11, and discharges the compressed fluid through the discharge port 34.

-operation actions-

Refrigerating operation

Heating operation

Effects of the embodiment

The scroll compressor 1 of the present embodiment includes a tubular housing 10, a compression mechanism 20, and a drive shaft 60, the compression mechanism 20 being housed in the housing 10 and having a fixed scroll 30, a movable scroll 40, and a frame 21, the drive shaft 60 being configured to rotationally drive the movable scroll 40, the frame 21 having a bearing portion 22, a body portion 23, a pressure contact portion 24, and a support portion 25, the bearing portion 22 supporting the drive shaft 60 and the drive shaft 60 being rotatable, the body portion 23 being connected to the bearing portion 22 and the body portion 23 extending radially outward, the pressure contact portion 24 being provided radially outward of the body portion 23 and being in pressure contact with the housing 10, the support portion 25 extending from a surface of the body portion 23 on the fixed scroll 30 side in the axial direction toward the fixed scroll 30, an end surface of the support portion 25 on the fixed scroll 30 side being a fastening surface 25a to which the fixed scroll 30 is fastened, a gap G1 is formed between the outer peripheral surfaces of main body 23 and support 25 and the inner peripheral surface of housing 10, and the axial length L1 of gap G1 is equal to or greater than the axial length L2 of the inner peripheral surface of support 25. Thus, the chassis 21 is fixed to the casing 10 by the crimping portion 24. An end surface of the support portion 25 on the fixed scroll 30 side is a fastening surface 25a of the fixed scroll 30. The crimping portion 24 and the supporting portion 25 are connected via the body portion 23. Pressure acts on the crimp 24 in a radial direction from the casing 10. On the other hand, since there is a gap G1 between the support portion 25 and the casing 10, the pressure force does not directly act on the support portion 25 from the casing 10. However, since the support portion 25 is connected to the pressure-bonding section 24, there is a possibility that the position of the support portion 25 may fluctuate due to the pressure acting on the pressure-bonding section 24 before and after the frame 21 is fixed to the housing 10. If such a positional variation is large, the sealability between the fastening surface 25a and the fixed scroll 30 is reduced. In contrast, in the present embodiment, the axial length L1 of the gap G1 is equal to or greater than the axial length L2 of the inner circumferential surface of the support portion 25. In other words, the axial distance between the surface of the main body portion 23 on the fixed scroll 30 side (the upper surface in this example) and the fixed scroll 30 is equal to or less than the axial distance between the end portion of the pressure contact portion 24 on the fixed scroll 30 side (the upper end portion in this example) and the fixed scroll 30. Therefore, the radial pressure acting on the crimping portion 24 from the casing 10 is reliably received by the main body portion 23 extending in the radial direction. The positional variation of the support portion 25 is suppressed, and the sealability between the fastening surface 25a and the fixed scroll 30 is improved. This can improve the efficiency of the scroll compressor 1.

In the scroll compressor 1 according to the present embodiment, the axial length L1 of the gap G1 is longer than the axial length L2 of the inner circumferential surface of the support portion 25. Therefore, the positional variation of the support portion 25 can be further suppressed, and the sealing property between the fastening surface 25a and the fixed scroll 30 can be further improved. This can further improve the efficiency of the scroll compressor 1.

In the scroll compressor 1 of the present embodiment, the main body portion 23 has a radial thickness larger than that of the support portion 25. Therefore, the radial pressure applied from the casing 10 to the pressure contact portion 24 is reliably received by the body portion 23 having a large radial thickness.

In the scroll compressor 1 of the present embodiment, the frame 21 has a welding portion 26 welded to the casing 10, and at least a part of the pressure contact portion 24 and at least a part of the welding portion 26 are arranged in parallel in the circumferential direction of the casing 10. Therefore, as compared with the case where the pressure contact portion 24 and the welding portion 26 are arranged in parallel in the axial direction of the casing 10, the frame 21 can be downsized in the axial direction, and further, the scroll compressor 1 can be downsized.

In the scroll compressor 1 according to the present embodiment, the welded portion 26 communicates with the internal space of the casing 10 through the gap G1. Therefore, when the frame 21 is welded to the housing 10, the welding gas escapes to the internal space of the housing 10 through the gap G1, and the occurrence of a welding failure can be suppressed.

(other embodiments)

The above embodiment may have the following configuration.

For example, axial length L1 of first gap G1 and axial length L2 of the inner circumferential surface of support portion 25 may be equal to each other.

For example, the number and arrangement of the welding portions 26 are not limited to those in the above embodiments, and can be set arbitrarily.

The embodiments and modifications have been described above, but it is understood that various changes and modifications can be made without departing from the spirit and scope of the claims. The above embodiments and modifications may be appropriately combined and replaced as long as the functions of the objects of the present disclosure are not affected.

Industrial applicability-

As described above, the present disclosure is useful for a refrigeration apparatus including a scroll compressor.

-description of symbols-

1 scroll compressor

10 casing

20 compression mechanism

21 machine frame

22 bearing part

23 main body part

24 crimping section

25 support part

25a fastening surface

26 welding part

30 static scroll

40-movement scroll

60 drive shaft

100 refrigeration device

G1 first gap (Clearance)

L1, L2 axial Length

S1 first space (inner space).