阅读说明：本技术 涡旋式压缩机 (Scroll compressor having a discharge port ) 是由 稻叶弘展 佐藤泰造 今井哲也 于 2020-03-16 设计创作，主要内容包括：提供一种使背压室与压缩室连通时的加工性得以改善的涡旋式压缩机。包括：背压室(39),所述背压室(39)形成于涡旋式压缩机(1)的动涡盘(22)的镜板(31)的背面；以及连通孔(51),所述连通孔(51)形成于动涡盘(22)的镜板(31),并使背压室(39)与压缩室(34)连通。所述连通孔(51)由大径孔部(52)和小径孔部(53)构成,所述大径孔部(52)位于动涡盘(22)的镜板(31)的背压室(39)一侧；所述小径孔部(53)从所述大径孔部(52)连续并直至压缩室(34)。(Provided is a scroll compressor with improved workability when a back pressure chamber and a compression chamber are communicated. The method comprises the following steps: a back pressure chamber (39), wherein the back pressure chamber (39) is formed on the back of a mirror plate (31) of a movable scroll (22) of the scroll compressor (1); and a communication hole (51), wherein the communication hole (51) is formed on the mirror plate (31) of the movable scroll (22) and communicates the back pressure chamber (39) with the compression chamber (34). The communicating hole (51) is composed of a large-diameter hole part (52) and a small-diameter hole part (53), the large-diameter hole part (52) is positioned at one side of a back pressure chamber (39) of a mirror plate (31) of the movable scroll (22); the small-diameter hole portion (53) continues from the large-diameter hole portion (52) to the compression chamber (34).)

1. A scroll compressor includes a compression mechanism composed of a fixed scroll and an orbiting scroll, each of which has a spiral-shaped surrounding member formed to face each front surface of each mirror plate, and compresses a working fluid by a compression chamber formed between the surrounding members of the two scrolls by orbiting and orbiting the orbiting scroll with respect to the fixed scroll,

it is characterized by comprising:

a back pressure chamber formed at a back surface of a mirror plate of the orbiting scroll; and

a communication hole formed at a mirror plate of the orbiting scroll to communicate the back pressure chamber with the compression chamber,

the communicating hole is composed of a large-diameter hole part and a small-diameter hole part, the large-diameter hole part is positioned on one side of the back pressure chamber of the mirror plate of the movable scroll, and the small-diameter hole part is continuous from the large-diameter hole part to the compression chamber.

2. The scroll compressor of claim 1,

the length of the small-diameter hole part is smaller than that of the large-diameter hole part.

3. A scroll compressor includes a compression mechanism composed of a fixed scroll and an orbiting scroll, each of which has a spiral-shaped surrounding member formed opposite to each front surface of each mirror plate, and compresses a working fluid by a compression chamber formed between the surrounding members of the two scrolls by orbiting and orbiting the orbiting scroll with respect to the fixed scroll,

it is characterized by comprising:

a back pressure chamber formed at a back surface of a mirror plate of the orbiting scroll;

a mounting hole formed at a mirror plate of the orbiting scroll from the back pressure chamber to the compression chamber; and

a communication member installed in the installation hole,

the communication member has a communication portion that communicates the back pressure chamber with the compression chamber.

4. The scroll compressor of claim 3,

the communication member is cylindrical, and the communication portion is formed by a through hole that communicates the back pressure chamber with the compression chamber.

5. The scroll compressor of claim 3 or 4,

the mounting hole is composed of a large-diameter hole part and a small-diameter hole part, the large-diameter hole part is positioned at one side of the back pressure chamber of the mirror plate of the movable scroll, the small-diameter hole part is continuous from the large-diameter hole part to the compression chamber,

the communication member is mounted in the large-diameter hole portion of the mounting hole.

6. The scroll compressor of any one of claims 1 to 5,

the inner diameter of the small-diameter hole portion or the communicating portion is smaller than the width of the surrounding piece of the fixed scroll.

7. The scroll compressor of any one of claims 1 to 6, comprising:

a back pressure passage that communicates a discharge side of the compression mechanism with the back pressure chamber; and

a decompression portion provided in the back pressure passage.

Technical Field

The present invention relates to a scroll compressor for compressing a working fluid through a compression chamber formed between surrounding members of two scrolls by orbiting a movable scroll relative to a fixed scroll.

Background

Conventionally, a scroll compressor of this type includes a compression mechanism including a fixed scroll including a spiral surrounding member on a front surface of a mirror plate and an orbiting scroll including a spiral surrounding member on a front surface of the mirror plate, and the orbiting scroll revolves around the fixed scroll by a motor to compress a working fluid (refrigerant) in a compression chamber by forming the compression chamber between the surrounding members by opposing the surrounding members of the respective scrolls.

In this case, a back pressure chamber for pressing the orbiting scroll against the fixed scroll against a compression reaction force from the compression chamber is formed at a back surface of a mirror plate of the orbiting scroll. Conventionally, a back pressure passage that communicates a discharge side (discharge space) of a compression mechanism with a back pressure chamber is formed, and an orifice is disposed in the back pressure passage so that a discharge pressure reduced by the orifice is supplied to the back pressure chamber, thereby applying a back pressure load against a compression reaction force to a movable scroll (see, for example, patent document 1).

In patent document 1, a hole for pressure control is formed in a mirror plate of the orbiting scroll. By forming the orifice, the oil flowing into the back pressure chamber from the back pressure passage is returned to the compression chamber, and in an operating state where the suction pressure is low, for example, the pressure (back pressure) in the back pressure chamber can be adjusted so as not to become excessive.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5859480

Disclosure of Invention

Technical problem to be solved by the invention

Here, in the case where a hole for pressure control is formed in the mirror plate of the orbiting scroll as in patent document 1, it is necessary to prevent the outer compression chamber and the inner compression chamber adjacent to each other with the surrounding member of the fixed scroll interposed therebetween from communicating with each other through the hole. Further, the orifice communicates the compression chamber with the back pressure chamber to perform pressure regulation, and has a relatively small inner diameter in order to produce a throttling function through the orifice.

Fig. 5 shows a cross section of a hole for pressure control of a conventional orbiting scroll. In the figure, reference numeral 100 is an orbiting scroll, reference numeral 101 is a mirror plate of the orbiting scroll 100, reference numeral 102 is a surround, and reference numeral 103 is the hole for pressure control. In this case, the length dimension (depth dimension) is relatively large (long) because the holes 103 must penetrate the mirror plate 101. In addition, in the case of forming the hole 103, the hole is cut by a machining tool for drilling, but since the inner diameter of the hole 103 is small, the hole is cut by a thin machining tool. Therefore, it takes time and the machining tool is easily broken, and a special tool is required.

The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a scroll compressor in which workability when a back pressure chamber and a compression chamber communicate with each other is improved.

Technical scheme for solving technical problem

A scroll compressor according to the invention of claim 1 includes a compression mechanism including a fixed scroll and an orbiting scroll, in which respective spiral surrounding members of the fixed scroll and the orbiting scroll are formed to face respective front surfaces of respective mirror plates, and the orbiting scroll revolves and revolves relative to the fixed scroll to compress a working fluid in a compression chamber formed between the surrounding members of the two scrolls, and the scroll compressor includes: a back pressure chamber formed at a back surface of a mirror plate of the orbiting scroll; and a communicating hole formed on the mirror plate of the orbiting scroll to communicate the back pressure chamber with the compression chamber, the communicating hole being composed of a large diameter hole part located at one side of the back pressure chamber of the mirror plate of the orbiting scroll and a small diameter hole part continuing from the large diameter hole part to the compression chamber.

The scroll compressor according to the invention of claim 2 is characterized in that the small-diameter hole portion has a length smaller than that of the large-diameter hole portion.

A scroll compressor according to the invention of claim 3 is a scroll compressor including a compression mechanism including a fixed scroll and an orbiting scroll, each of spiral surrounds of the fixed scroll and the orbiting scroll being formed to face each front surface of each mirror plate, the orbiting scroll orbiting around the fixed scroll so as to compress a working fluid in a compression chamber formed between the surrounds of the two scrolls, the scroll compressor including: a back pressure chamber formed at a back surface of a mirror plate of the orbiting scroll; a mounting hole formed at the mirror plate of the orbiting scroll from the back pressure chamber to the compression chamber; and a communication member installed in the installation hole, the communication member having a communication portion that communicates the back pressure chamber with the compression chamber.

The scroll compressor according to claim 4 of the present invention is characterized in that the communicating member is cylindrical, and the communicating portion is formed by a through hole communicating the back pressure chamber and the compression chamber.

The scroll compressor according to the invention of claim 5 is the scroll compressor according to the invention of claim 3 or 4, wherein the mounting hole includes a large diameter hole portion located on the back pressure chamber side of the mirror plate of the orbiting scroll and a small diameter hole portion extending from the large diameter hole portion to the compression chamber, and the communicating member is mounted in the large diameter hole portion of the mounting hole.

The scroll compressor according to the invention of claim 6 is characterized in that the inner diameter of the small-diameter hole portion or the communicating portion is smaller than the width of the surrounding member of the fixed scroll.

The scroll compressor according to the invention of claim 7 is, in addition to the above inventions, characterized by including: a back pressure passage that communicates a discharge side of the compression mechanism with the back pressure chamber; and a decompression unit provided in the back pressure passage.

Effects of the invention

According to the invention of claim 1, since the scroll compressor includes the compression mechanism constituted by the fixed scroll and the movable scroll, the respective spiral surrounds of the fixed scroll and the movable scroll are formed to face the respective front faces of the respective mirror plates, the movable scroll revolves and revolves with respect to the fixed scroll to compress the working fluid by the compression chamber formed between the respective surrounds of the two scrolls, the back pressure chamber is formed on the back face of the mirror plate of the movable scroll, the communication hole communicating the back pressure chamber with the compression chamber is formed in the mirror plate of the movable scroll, and the communication hole is constituted by the large diameter hole portion located on the back pressure chamber side of the mirror plate of the movable scroll and the small diameter hole portion continuing from the large diameter hole portion to the compression chamber, when the communication hole communicating the back pressure chamber with the compression chamber is formed in the mirror plate of the movable scroll, only the small diameter hole portion in the communication hole is processed by the fine processing tool, and machining the large-diameter hole part by using a relatively thick machining cutter.

This can significantly improve the workability of the communication hole that communicates the back pressure chamber and the compression chamber. In particular, as in the invention of claim 2, the length of the small-diameter hole is made smaller than the length of the large-diameter hole, thereby further improving the workability.

Further, according to the invention of claim 3, since the scroll compressor includes the compression mechanism constituted by the fixed scroll and the movable scroll, the respective spiral-shaped surrounding members of the fixed scroll and the movable scroll are formed to face the respective front surfaces of the respective mirror plates, the movable scroll revolves and revolves relative to the fixed scroll to compress the working fluid by the compression chamber formed between the respective surrounding members of the two scrolls, the back pressure chamber is formed on the back surface of the mirror plate of the movable scroll, the mirror plate of the movable scroll is formed with the mounting hole from the back pressure chamber to the compression chamber, and the communicating member is mounted in the mounting hole, and the communicating portion for communicating the back pressure chamber with the compression chamber is provided in the communicating member, it is not necessary to process the mirror plate of the movable scroll by a fine processing tool in order to communicate the back pressure chamber with the compression chamber.

That is, for example, as in the invention of claim 4, since a through hole is formed in the cylindrical communicating member to serve as the communicating portion, workability of the orbiting scroll for communicating the back pressure chamber and the compression chamber can be remarkably improved.

In this case, as in the invention of claim 5, when the mounting hole is formed by the large diameter hole portion located on the back pressure chamber side of the mirror plate of the orbiting scroll and the small diameter hole portion continuing from the large diameter hole portion to the compression chamber and the communicating member is mounted in the large diameter hole portion of the mounting hole, the communicating member is not exposed to the front surface of the mirror plate of the orbiting scroll, and positioning is facilitated.

Further, by making the inner diameter of the small-diameter hole portion or the communicating portion smaller than the width of the fixed scroll wrap as in the invention of claim 6, it is possible to prevent a problem that the outer compression chamber and the inner compression chamber adjacent to each other across the fixed scroll wrap communicate with each other through the small-diameter hole portion or the communicating portion.

The above invention is extremely effective when the pressure on the discharge side is reduced by the back pressure passage and applied to the back pressure chamber as in the invention of claim 7.

Drawings

Fig. 1 is a sectional view of a scroll compressor to which an embodiment of the present invention is applied.

Fig. 2 is an enlarged sectional view of a communication hole portion of an orbiting scroll of the scroll compressor of fig. 1 (embodiment 1).

Fig. 3 is an enlarged sectional view of a communicating member portion of an orbiting scroll of the scroll compressor of fig. 1 (embodiment 2).

Fig. 4 is another enlarged sectional view of a communicating member portion of an orbiting scroll of the scroll compressor of fig. 1 (embodiment 3).

Fig. 5 is an enlarged cross-sectional view of a portion of a hole for pressure control of an orbiting scroll of a conventional scroll compressor.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Example 1

Fig. 1 is a sectional view of a scroll compressor 1 to which an embodiment of the present invention is applied. The scroll compressor 1 of the embodiment is a so-called inverter-integrated scroll compressor used in a refrigerant circuit of a vehicle air conditioner, for example, and configured to suck a refrigerant as a working fluid of the vehicle air conditioner, compress the refrigerant, and discharge the compressed refrigerant, and includes a motor 2, an inverter 3 for operating the motor 2, and a compression mechanism 4 driven by the motor 2.

The scroll compressor 1 of the embodiment includes: a main housing 6 that houses the motor 2 and the inverter 3 inside the main housing 6; a compression mechanism housing 7 that houses the compression mechanism 4 inside the compression mechanism housing 7; an inverter cover 8; and a compression mechanism cover 9. The main casing 6, the compression mechanism casing 7, the inverter cover 8, and the compression mechanism cover 9 are made of metal (aluminum in the embodiment), and are integrally joined to constitute a casing 11 of the scroll compressor 1.

The main casing 6 is composed of a cylindrical peripheral wall portion 6A and a partition wall portion 6B. The partition wall 6B is a partition wall that partitions the interior of the main casing 6 into a motor housing portion 12 that houses the motor 2 and an inverter housing portion 13 that houses the inverter 3. One end surface of the inverter housing portion 13 is open, and the opening is closed by the inverter cover 8 after housing the inverter 3.

The other end surface of the motor housing 12 is open, and the opening is closed by the compression mechanism case 7 after housing the motor 2. A support portion 16 is provided so as to protrude from the partition wall portion 6B, and the support portion 16 supports one end portion (an end portion on the opposite side from the compression mechanism 4) of the rotating shaft 14 of the motor 2.

The compression mechanism housing 7 is open on the side opposite to the main housing 6, and the opening is closed by a compression mechanism cover 9 after the compression mechanism 4 is housed. The compression mechanism casing 7 is composed of a cylindrical peripheral wall portion 7A and a frame portion 7B on one end side (main casing 6 side) of the peripheral wall portion 7A, and the compression mechanism 4 is accommodated in a space defined by the peripheral wall portion 7A and the frame portion 7B. The frame 7B is a partition wall that partitions the inside of the main casing 6 and the inside of the compression mechanism casing 7.

Further, the frame portion 7B is opened with a through hole 17 through which the other end portion (end portion on the compression mechanism 4 side) of the rotating shaft 14 of the electric motor 2 is inserted, and a front bearing 18 as a bearing member that supports the other end portion of the rotating shaft 14 is fitted to the compression mechanism 4 side of the through hole 17. Further, reference numeral 19 denotes a seal member for sealing the outer peripheral surface of the counter shaft 14 and the inside of the compression mechanism case 7 at the through hole 17 portion.

The motor 2 is composed of a stator 25 around which a coil 35 is wound and a rotor 30. Further, for example, a direct current from a battery (not shown) of the vehicle is converted into a three-phase alternating current by the inverter 3, and the rotor 30 is driven to rotate by supplying power to the coil 35 of the motor 2.

A suction port, not shown, is formed in the main casing 6, and the refrigerant sucked from the suction port is sucked into a suction portion 37, which will be described later, outside the compression mechanism 4 in the compression mechanism casing 7 after passing through the main casing 6. Thereby, the motor 2 is cooled by the sucked refrigerant. The refrigerant compressed by the compression mechanism 4 is discharged from a discharge port, not shown, formed in the compression mechanism cover 9 from a discharge space 27, which will be described later, that is a discharge side of the compression mechanism 4.

The compression mechanism 4 is constituted by a fixed scroll 21 and a movable scroll 22. The fixed scroll 21 integrally includes a disk-shaped mirror plate 23 and a spiral surround 24, the surround 24 is formed by an involute or a curve close to the involute which is erected on a front surface (one surface) of the mirror plate 23, and the front surface of the mirror plate 23 on which the surround 24 is erected is fixed to the compression mechanism case 7 as a frame portion 7B side. A discharge hole 26 is formed in the center of the mirror plate 23 of the fixed scroll 21, and the discharge hole 26 communicates with a discharge space 27 in the compression mechanism cover 9. Reference numeral 28 denotes an outlet valve provided at an opening on the back surface (the other surface) side of the mirror plate 23 of the outlet 26.

The orbiting scroll 22 is a scroll that orbits and revolves with respect to the fixed scroll 21, and integrally includes a disk-shaped mirror plate 31, a spiral surround 32, and a boss portion 33, the surround 32 is formed by an involute or approximately involute curve that stands on the front surface (one surface) of the mirror plate 31, and the boss portion 33 is formed protruding at the center of the back surface (the other surface) of the mirror plate 31. The orbiting scroll 22 is disposed so that the protruding direction of the orbiting scroll 32 is set to the fixed scroll 21 side, the orbiting scroll 32 faces the orbiting scroll 24 of the fixed scroll 21 to be engaged with each other while facing each other, and a compression chamber 34 is formed between the respective orbiting scrolls 24 and 32.

That is, the surround 32 of the orbiting scroll 22 is opposed to the surround 24 of the fixed scroll 21, and is engaged in such a manner that the front end of the surround 32 contacts the front surface of the mirror plate 23 and the front end of the surround 24 contacts the front surface of the mirror plate 31. A cylindrical drive projection 48 is provided at the other end of the rotating shaft 14, that is, at the end on the orbiting scroll 22 side, and the drive projection 48 projects at a position eccentric from the axial center of the rotating shaft 14. Further, a cylindrical eccentric bush 36 is attached to the driving projection 48, and is provided to be eccentric from the axial center of the rotating shaft 14 at the other end portion of the rotating shaft 14.

In this case, a driving protrusion 48 is attached to the eccentric bush 36 at a position eccentric from the axial center of the eccentric bush 36, and the eccentric bush 36 is fitted to the boss portion 33 of the orbiting scroll 22. When the rotation shaft 14 rotates together with the rotor 30 of the motor 2, the orbiting scroll 22 orbits and revolves around the fixed scroll 21 without rotating. Reference numeral 49 denotes a balance weight attached to the outer peripheral surface of the rotary shaft 14 on the orbiting scroll 22 side of the front bearing 18.

Since the orbiting scroll 22 orbits eccentrically with respect to the fixed scroll 21, the eccentric direction and contact position of the orbiting scroll 24 and 32 move while revolving, and the compression chamber 34, which sucks the refrigerant from the suction portion 37 on the outer side, gradually shrinks while moving to the inner side. Thereby, the refrigerant is compressed and finally discharged from the discharge hole 26 at the center to the discharge space 27 through the discharge valve 28.

In fig. 1, reference numeral 38 denotes an annular thrust plate. The thrust plate 38 is a member for defining a back pressure chamber 39 formed on the back surface side of the mirror plate 31 of the orbiting scroll 22 and a suction portion 37 as a suction pressure region outside the compression mechanism 4 in the compression mechanism casing 7, and is located outside the boss portion 33 and interposed between the frame portion 7B and the orbiting scroll 22. Reference numeral 41 denotes a seal member attached to the back surface of the mirror plate 31 of the orbiting scroll 22 and abutting against the thrust plate 38, and the back pressure chamber 39 and the suction portion 37 are defined by the seal member 41 and the thrust plate 38.

Reference numeral 42 denotes a seal member which is attached to a surface of the frame portion 7B on the thrust plate 38 side and which abuts against the outer peripheral portion of the thrust plate 38 to seal between the frame portion 7B and the thrust plate 38.

In fig. 1, reference numeral 43 denotes a back pressure passage formed from the compression mechanism cover 9 to the compression mechanism casing 7, and an orifice 44 as a decompression portion is installed in the back pressure passage 43. The back pressure passage 43 is configured to communicate with the back pressure chamber 39 in the discharge space 27 of the compression mechanism cover 9 (discharge side of the compression mechanism 4), and thereby oil at a discharge pressure reduced and adjusted by the orifice 44 is mainly supplied to the back pressure chamber 39 as indicated by an arrow in fig. 1.

A back pressure load for pressing the orbiting scroll 22 against the fixed scroll 21 is generated by the pressure (back pressure) in the back pressure chamber 39. By pressing the orbiting scroll 22 against the fixed scroll 21 against the compression reaction force from the compression chamber 34 of the compression mechanism 4 by the back pressure load, the contact of the surrounding members 24, 32 with the mirror plates 31, 23 is maintained, so that the refrigerant can be compressed by the compression chamber 34.

In the present embodiment, the communicating hole 51 is cut in the mirror plate 31 of the orbiting scroll 22. The communication hole 51 is a hole for pressure control that communicates the back pressure chamber 39 on the back side of the mirror plate 31 of the movable scroll 22 with the compression chamber 34 on the front side of the mirror plate 31. The communication hole 51 functions to prevent excessive back pressure by allowing the pressure (back pressure) in the back pressure chamber 39 to escape to the compression chamber 34 in an operation state where the suction pressure is low, for example. At this time, the oil in the back pressure chamber 39 is also returned to the compression chamber 34. This is extremely effective when the pressure in the discharge space 27 is reduced by the orifice 44 through the back pressure passage 43 and applied to the back pressure chamber 39 as in the embodiment.

Next, the shape and the formation procedure of the communication hole 51 will be described with reference to fig. 2. The communication hole 51 of the present embodiment is constituted by a large diameter hole portion 52 and a small diameter hole portion 53, the large diameter hole portion 52 is located on the back pressure chamber 39 side of the mirror plate 31, and the small diameter hole portion 53 continues from the large diameter hole portion 52 to the compression chamber 34 on the front side of the mirror plate 31. The inner diameter of the small-diameter hole 53 is smaller than the width of the surrounding material 24 of the fixed scroll 21, and the large-diameter hole 52 is larger than the small-diameter hole 53. In the embodiment, the length of the small-diameter hole 53 is set to be smaller than the length of the large-diameter hole 52.

When the communicating hole 51 is formed in the mirror plate 31, first, the mirror plate 31 is cut by a relatively large (large-diameter) machining tool from the back side of the mirror plate 31 to form a large-diameter hole 52. Next, a relatively thin (small diameter) machining tool is inserted into the large diameter hole 52 and cut to the front side of the mirror plate 31 through the bottom of the large diameter hole 52 to form a small diameter hole 53, whereby a series of communication holes 51 communicating the back pressure chamber 39 and the compression chamber 34 are formed through the mirror plate 31.

In this way, in the case where the communication hole 51 for communicating the back pressure chamber 39 and the compression chamber 34 is formed in the mirror plate 31 of the orbiting scroll 22, since the communication hole 51 is constituted by the large diameter hole portion 52 located on the back pressure chamber 39 side of the mirror plate 31 of the orbiting scroll 22 and the small diameter hole portion 53 continuing from the large diameter hole portion 52 to the compression chamber 34, when the communication hole 51 for communicating the back pressure chamber 39 and the compression chamber 34 is formed in the mirror plate 31 of the orbiting scroll 22, only the small diameter hole portion 53 of the communication hole 51 may be machined by a thin machining tool, and the large diameter hole portion 52 may be machined by a relatively thick machining tool.

This can significantly improve the workability of the communication hole 51 that communicates the back pressure chamber 39 and the compression chamber 34. In particular, as in the embodiment, the length of the small-diameter hole portion 53 is made smaller than the length of the large-diameter hole portion 52, thereby further improving the workability. Further, by making the inner diameter of the small-diameter hole portion 53 smaller than the width of the surround 24 of the fixed scroll 21 as in the embodiment, it is possible to prevent a problem that the outer compression chamber 34 and the inner compression chamber 34 adjacent to each other across the surround 24 of the fixed scroll 21 communicate with each other through the small-diameter hole portion 53 of the communication hole 51.

Example 2

Next, another embodiment (embodiment 2) of the present invention will be described with reference to fig. 3. In this embodiment, instead of the communication hole 51 in fig. 1 and 2, a mounting hole 54 extending from the back pressure chamber 39 to the compression chamber 34 is formed through the mirror plate 31 of the orbiting scroll 22, and a communication member 56 is mounted in the mounting hole 54. Other structures are the same as those in fig. 1.

In this case, the mounting hole 54 is a relatively large-diameter hole, and the communication member 56 is cylindrical (tubular) in the embodiment, and has a communication portion 57 constituted by a relatively small-diameter through hole at the axial center. The inner diameter of the communication portion 57 is smaller than the width of the surround 24 of the fixed scroll 21, and the communication member 56 is press-fitted into the mounting hole 54 of the mirror plate 31, screwed into a screw groove on the side surface, or riveted.

As in the present embodiment, when the mounting hole 54 extending from the back pressure chamber 39 to the compression chamber 34 is formed in the mirror plate 31 of the orbiting scroll 22, the communication member 56 is mounted in the mounting hole 54, and the communication portion 57 for communicating the back pressure chamber 39 with the compression chamber 34 is provided in the communication member 56, it is not necessary to machine the mirror plate 31 of the orbiting scroll 22 by a fine machining tool in order to communicate the back pressure chamber 39 with the compression chamber 34.

That is, as in the embodiment, a through hole may be formed in the cylindrical communication member 56 to form the communication portion 57, and thus, workability of the orbiting scroll 22 for communicating the back pressure chamber 39 with the compression chamber 34 can be remarkably improved. Further, by making the inner diameter of the communicating portion 57 smaller than the width of the orbiting member 24 of the fixed scroll 21 as in the embodiment, it is possible to prevent a problem that the outer compression chamber 34 and the inner compression chamber 34 adjacent to each other with the orbiting member 24 of the fixed scroll 21 interposed therebetween communicate with each other through the communicating portion 57 of the communicating member 56.

In the embodiment, the communication member 56 is formed as a cylindrical member and the communication portion 57 is formed by a through hole in the axial center, but the present invention is not limited to this, and for example, a thin groove in the axial direction may be formed in advance in a side surface of the communication member 56, and the communication portion 57 may be formed by the groove and the mounting hole 54.

Example 3

Next, another embodiment (embodiment 3) of the present invention will be described with reference to fig. 4. In the case of this embodiment, as in the case of fig. 3, a mounting hole 54 extending from the back pressure chamber 39 to the compression chamber 34 is formed through the mirror plate 31 of the orbiting scroll 22, and instead of the communication hole 51 in fig. 1 and 2, a communication member 56 is mounted in the mounting hole 54. Other structures are the same as those in fig. 1.

However, in this case, the mounting hole 54 is constituted by a large diameter hole portion 58 and a small diameter hole portion 59, the large diameter hole portion 58 being located on the back pressure chamber 39 side of the mirror plate 31, and the small diameter hole portion 59 continuing from the large diameter hole portion 58 to the compression chamber 34 on the front side of the mirror plate 31. The small-diameter hole portion 59 of the embodiment has an inner diameter larger than that of the small-diameter hole portion 53 of fig. 2, but still smaller than the width of the surrounding member 24 of the fixed scroll 21. The inner diameter of the large-diameter hole portion 58 is larger than the inner diameter of the small-diameter hole portion 59, and is the same as the inner diameter of the mounting hole 54 in fig. 3.

In the embodiment, the length of the small-diameter hole portion 59 is set to be smaller than the length of the large-diameter hole portion 58. The communicating member 56 has the same configuration as that of fig. 3, but has a short length, and can be accommodated in the large-diameter hole portion 58 of the mounting hole 54 of fig. 4.

In the present embodiment, when the mounting holes 54 are formed in the mirror plate 31, first, the mirror plate 31 is cut by a relatively thick (large diameter) machining tool from the back side of the mirror plate 31 to form the large-diameter hole portions 58. Next, a small-diameter hole portion 59 is formed by inserting a thinner machining tool into the large-diameter hole portion 58 and digging it to the front side of the mirror plate 31 through the bottom of the large-diameter hole portion 58, so that the continuous mounting hole 54 spanning from the back pressure chamber 39 to the compression chamber 34 is formed through the mirror plate 31.

Next, the communication member 56 (short member) of the present embodiment is mounted in the large diameter hole portion 58 of the mounting hole 54 from the back side of the mirror plate 31 by press fitting, by screwing the screw groove of the side surface, or by caulking.

In the embodiment, as in the case of embodiment 2, it is not necessary to machine the mirror plate 31 of the orbiting scroll 22 with a thin machining tool in order to communicate the back pressure chamber 39 with the compression chamber 34. That is, as in the embodiment, a through hole may be formed in the cylindrical communication member 56 to form the communication portion 57, and thus, workability of the orbiting scroll 22 for communicating the back pressure chamber 39 with the compression chamber 34 can be remarkably improved. Further, by making the inner diameter of the small-diameter hole portion 59 smaller than the width of the orbiting part 24 of the fixed scroll 21 as in the embodiment, it is possible to prevent a problem that the outer compression chamber 34 and the inner compression chamber 34 adjacent to each other across the orbiting part 24 of the fixed scroll 21 communicate with each other through the small-diameter hole portion 59 of the communication hole 54.

In particular, when the communication member 56 is mounted in the large-diameter hole portion 58 of the mounting hole 54 while being constituted by the large-diameter hole portion 58 positioned on the back pressure chamber 39 side of the mirror plate 31 of the orbiting scroll 22 and the small-diameter hole portion 59 continuing from the large-diameter hole portion 58 to the compression chamber 34 as in the present embodiment, the communication member 56 is not exposed to the front side (the surround 32 side) of the mirror plate 31 of the orbiting scroll 22, and positioning becomes easy.

In the case of this embodiment, as in the case of embodiment 2, for example, a thin groove in the axial direction may be formed in the side surface of the communication member 56, and the communication portion 57 may be formed by the groove and the large-diameter hole portion 58 of the attachment hole 54.

In the embodiments, the present invention is applied to the scroll compressor used in the refrigerant circuit of the vehicle air conditioner, but the present invention is not limited to this, and is also effective in the scroll compressor used in the refrigerant circuit of various refrigeration apparatuses. In the embodiment, the present invention is applied to a so-called inverter-integrated scroll compressor, but the present invention is not limited to this, and may be applied to a general scroll compressor which does not integrally include an inverter.

(symbol description)

1 a scroll compressor;

4, a compression mechanism;

14 a rotating shaft;

21 fixed scroll pan;

22 an orbiting scroll;

23. 31 a mirror plate;

24. 32 a surround;

27 discharge space (discharge side);

34 a compression chamber;

39 a back pressure chamber;

43 a back pressure passage;

44 orifice (relief portion);

51 a communication hole;

52. 58 large-diameter hole parts;

53. a 59 small diameter hole part;

54 mounting holes;

56 a communication member;

57 a communication part.