WO2022070812A1

WO2022070812A1 - Scroll compressor

Info

Publication number: WO2022070812A1
Application number: PCT/JP2021/032988
Authority: WO
Inventors: 善彰宮本; 洋悟高須; 一樹高橋; 央幸木全
Original assignee: 三菱重工サーマルシステムズ株式会社
Priority date: 2020-09-30
Filing date: 2021-09-08
Publication date: 2022-04-07
Also published as: JP2022057338A; EP4170172A4; JP7203796B2; EP4170172A1

Abstract

Provided is a scroll compressor capable of suppressing a rise in temperature of a discharge gas and suppressing reduction in compression efficiency at the time of non-injection. This scroll compressor comprises: a compression mechanism (60) including a fixed scroll (70) in which a fixed-side wall (75) having a spiral shape is provided on a fixed-side end plate (71), and an orbiting scroll (80) which forms a compression chamber (61) for compressing a refrigerant together with the fixed-side wall (75) and which relatively performs a revolving/orbiting movement about a center axis line (X) of the fixed scroll (70); a housing (33) receiving the compression mechanism (60) in the inside; and a refrigerant flow passage (51) which is provided in the inside of the housing (33) and which causes the suction side of the compression chamber (61) to communicate from the back surface side of the fixed-side end plate (71) through the outer peripheral side of the fixed-side wall (75) in a plurality of directions conforming to the circumferential direction with respect to the center axis line (X).

Description

Scroll compressor

This disclosure relates to a scroll compressor.

In recent years, the temperature of the refrigerant (discharged gas) discharged from the compressor tends to increase due to the use of a refrigerant having a low global warming potential (GWP) in a refrigerating cycle such as a refrigerating device or an air conditioner.

Compressors used under operating conditions with high pressure ratios, such as low-temperature refrigeration equipment, employ a liquid injection structure that injects refrigerant liquid during the compression stroke of the compressor in order to lower the temperature of the discharged gas. (For example, Patent Document 1 and Patent Document 2).

Japanese Unexamined Patent Publication No. 2019-210867 International Publication No. 2018/198164

However, in the configuration in which the liquid injection port for supplying the liquid refrigerant to the compression chamber is formed on the fixed scroll end plate as in Patent Document 1, the liquid injection port communicating with the compression chamber is used for compressing the refrigerant during non-injection. It becomes a space (dead volume) that does not contribute. Therefore, in the configuration of Patent Document 1, there is a possibility that the compression efficiency is lowered at the time of non-injection.

On the other hand, in the configuration of Patent Document 2, since the flow path for guiding the liquid refrigerant to the compression chamber is not formed in the fixed scroll end plate, the dead volume as in Patent Document 1 does not occur. However, since the introduced liquid refrigerant is guided to the compression chamber through the limited space on the back side of the fixed scroll end plate, it is not efficient from the viewpoint of cooling the fixed scroll end plate (and thus the entire fixed scroll).

The present disclosure has been made in view of such circumstances, and provides a scroll compressor capable of suppressing an increase in the temperature of the discharged gas and suppressing a decrease in compression efficiency during non-injection. The purpose.

In order to solve the above problems, the scroll compressor of the present disclosure adopts the following means.
That is, in the scroll compressor according to one aspect of the present disclosure, a fixed scroll in which a spiral fixed side wall body is provided on a fixed side end plate and a compression chamber for compressing a refrigerant together with the fixed side wall body are formed and fixed. A compression mechanism having a swivel scroll that revolves and swivels relative to the central axis of the scroll, a housing that houses the compression mechanism inside, and a circumferential direction provided inside the housing with respect to the central axis. It is provided with a refrigerant flow path for communicating the suction side of the compression chamber from the back surface side of the fixed side end plate to the suction side of the compression chamber via the outer peripheral side of the fixed side wall body in a plurality of directions along the above.

According to the present disclosure, it is possible to suppress the temperature rise of the discharged gas and the decrease of the compression efficiency at the time of non-injection.

It is a schematic block diagram of the refrigerating cycle provided with the scroll compressor which concerns on one Embodiment of this disclosure. It is a vertical sectional view of the scroll compressor which concerns on one Embodiment of this disclosure. It is a top view of the fixed scroll housed in the housing in the scroll compressor which concerns on one Embodiment of this disclosure. It is a vertical sectional view of the scroll compressor which concerns on a modification.

Hereinafter, the scroll compressor according to the embodiment of the present disclosure will be described with reference to FIGS. 1 to 4.

[About the structure of the scroll compressor]
As shown in FIG. 1, the scroll compressor 11 constitutes a refrigeration cycle 10 together with a condenser 12, an expansion valve 13, an evaporator 14, a refrigerant pipe 15, and the like. The refrigeration cycle 10 further includes an injection circuit 20.

The injection circuit 20 has an injection pipe 21, a strainer 22, a valve 23, and a capillary tube 24 provided in the injection pipe 21.

The injection pipe 21 connects the refrigerant pipe 15 connected to the refrigerant outlet of the condenser 12 and the scroll compressor 11, and the liquid refrigerant condensed by the condenser 12 is used in the scroll compressor 11 (details will be described later). It leads to the liquid injection pipe 34).
The strainer 22 removes foreign matter contained in the liquid refrigerant flowing through the injection pipe 21.
The valve 23 adjusts the flow rate of the liquid refrigerant flowing through the injection pipe 21. The valve 23 is, for example, an on-off valve, a flow rate adjusting valve, or the like.
The capillary tube 24 reduces the pressure of the liquid refrigerant flowing through the injection pipe 21 to a pressure suitable for liquid injection.

As shown in FIG. 2, the scroll compressor 11 is a closed type scroll compressor, and has a housing 33 having a closed space inside, a discharge cover 40 for dividing the closed space, and a compression mechanism 60 for compressing the refrigerant. A drive shaft 95 for revolving and turning the swivel scroll 80 of the compression mechanism 60, and an electric motor 96 for driving the drive shaft 95 are provided.

The housing 33 forms a closed space inside by the upper housing 33A, the intermediate housing 33B, and the lower housing (not shown).

The upper housing 33A and the intermediate housing 33B are connected with the outer peripheral end of the discharge cover 40 sandwiched between them. That is, the enclosed space inside the housing 33 is divided in the central axis X direction by the discharge cover 40. Of the divided closed spaces, the closed space corresponding to the upper housing 33A is the discharge chamber 53, and the closed space corresponding to the intermediate housing 33B is the suction chamber 55.

A discharge pipe 31 for discharging the refrigerant is provided on the upper wall of the upper housing 33A, and the discharge chamber 53 and the outside of the upper housing 33A (housing 33) are communicated with each other.
The discharge pipe 31 is connected to the refrigerant pipe 15, and is configured so that the refrigerant discharged from the discharge pipe 31 is guided to the condenser 12 (see FIG. 1).

A suction pipe 32 for sucking the refrigerant is provided on the side wall of the intermediate housing 33B, and the suction chamber 55 and the outside of the intermediate housing 33B (housing 33) are communicated with each other.
The suction pipe 32 is connected to the refrigerant pipe 15, and is configured so that the refrigerant vaporized by the evaporator 14 is guided to the suction chamber 55 (see FIG. 1).

The suction chamber 55 is provided with a compression mechanism 60 for compressing the refrigerant, a drive shaft 95, an electric motor 96, and a support member 97 for supporting the drive shaft 95.

The compression mechanism 60 includes a fixed scroll 70 in which a spiral fixed side wall 75 is erected on the fixed side end plate 71, and a swirl scroll 80 in which a spiral swirl side wall 85 is erected on the swirl side end plate 81. have.
In the fixed scroll 70 and the swivel scroll 80, the fixed side wall body 75 and the swivel side wall body 85 mesh with each other to form a compression chamber 61. Thermal expansion of each wall body between the tooth tip of the fixed side wall body 75 and the tooth bottom of the swivel side end plate 81, and between the tooth tip of the swivel side wall body 85 and the tooth bottom of the fixed side end plate 71. The chip gap is set in consideration of.

The fixed scroll 70 is fixed to the support member 97 by a fixing portion 74 formed at the outer peripheral end portion of the fixed side end plate 71. As shown in FIG. 3, the fixing portions 74 project outward in the radial direction, and are provided at a plurality of locations in the circumferential direction. Since the support member 97 is fixed to the intermediate housing 33B, the fixed scroll 70 is fixed to the intermediate housing 33B via the support member 97.
The "radial direction" and "circumferential direction" referred to here are for the central axis X of the fixed scroll 70.

The swivel scroll 80 is configured to revolve around the central axis X of the fixed scroll 70 by a drive shaft 95 and a rotation prevention mechanism (for example, an Oldham link).

A discharge cover 40 is arranged above the fixed scroll 70 (on the back side of the fixed side end plate 71), and includes a back pressure chamber 54 and a refrigerant flow path 51 (including an annular flow path 52) together with the back surface of the fixed side end plate 71. ) Is defined.
The details are as follows.

As shown in FIGS. 2 and 3, a ridge portion 73 formed in an annular shape around the central axis X is provided on the back surface of the fixed side end plate 71. Further, on the surface of the discharge cover 40 facing the back surface of the fixed side end plate 71, a groove portion 42 formed in an annular shape corresponding to the shape of the ridge portion 73 is provided.

As shown in FIG. 2, the ridge portion 73 and the groove portion 42 are configured to fit each other. In a state where the ridge portion 73 is fitted to the groove portion 42, a predetermined space is provided between the back surface of the fixed side end plate 71 inside the ridge portion 73 and the surface of the discharge cover 40 inside the groove portion 42. Is formed. This space is referred to as a back pressure chamber 54. The back pressure chamber 54 is formed in a circular shape inside the ridge portion 73.

In a state where the ridge portion 73 is fitted to the groove portion 42, a predetermined space is formed between the tip surface of the ridge portion 73 and the bottom surface of the groove portion 42. This space is referred to as an annular flow path 52. The annular flow path 52 is formed in an annular shape by the ridge portion 73 and the groove portion 42. Further, a predetermined space is formed between the surface of the fixed side end plate 71 on the outside of the ridge portion 73 and the surface of the discharge cover 40 on the outside of the groove portion 42. This space and the annular flow path 52 are referred to as a refrigerant flow path 51.

An O-ring 94 is provided between the inner peripheral surface of the groove portion 42 and the inner peripheral surface of the ridge portion 73 to seal between the back pressure chamber 54 and the refrigerant flow path 51.
On the other hand, a sealing member (for example, an O-ring) is not provided between the outer peripheral surface of the groove portion 42 and the outer peripheral surface of the ridge portion 73, and a gap is formed. This gap is formed at least in a plurality of places (for example, over the entire circumference) along the circumferential direction. This gap is also a part of the refrigerant flow path 51.

As shown in FIG. 4, the ring groove may be omitted from the outer peripheral surface of the groove portion 42 so that the O-ring is not forcibly provided. This makes it possible to prevent an unnecessary O-ring from being accidentally provided at the time of assembly.

The fixed side end plate 71 is formed with a discharge port 72 that communicates the compression chamber 61 and the back pressure chamber 54. Further, the discharge cover 40 is formed with a discharge port 41 (different from the discharge port 72 of the fixed side end plate 71) that communicates the back pressure chamber 54 and the discharge chamber 53. That is, the compression chamber 61 and the discharge chamber 53 communicate with each other via the discharge port 72, the back pressure chamber 54, and the discharge port 41.

In the back pressure chamber 54, a retainer 93 that regulates the movable range of the reed valve 92 and the reed valve 92 is provided at the outlet portion of the discharge port 72.

A liquid injection pipe 34 for guiding the liquid refrigerant from the injection pipe 21 is provided on the wall surface of the upper housing 33A, and the annular flow path 52 and the outside of the upper housing 33A (housing 33) are communicated with each other.

[Refrigerant flow]
In the scroll compressor 11 configured as described above, the refrigerant flows as follows.
That is, the refrigerant vaporized by the evaporator 14 (see FIG. 1) is guided from the suction pipe 32 to the suction chamber 55 of the scroll compressor 11 via the refrigerant pipe 15.

The refrigerant guided to the suction chamber 55 is taken into the compression chamber 61 from around the compression mechanism 60 (compression chamber 61). The refrigerant taken into the compression chamber 61 is compressed in the compression chamber 61 whose volume changes due to the revolution rotation motion of the swirl scroll 80, and is transferred from the discharge port 72 formed in the central portion of the fixed side end plate 71 to the back pressure chamber 54. Be guided.

The refrigerant guided to the back pressure chamber 54 is guided to the discharge chamber 53 via the discharge port 41 formed in the discharge cover 40.

The refrigerant guided to the discharge chamber 53 is guided from the discharge pipe 31 to the condenser 12 (see FIG. 1) via the refrigerant pipe 15 connected to the discharge pipe 31.

As shown in FIG. 1, the refrigerant guided to the condenser 12 is condensed by heat exchange, a part of the liquid refrigerant is guided to the injection pipe 21 as an injection liquid, and the remaining refrigerant is an expansion valve via the refrigerant pipe 15. Guided to 13.

The refrigerant guided to the expansion valve 13 is expanded (decompressed) and guided to the evaporator 14.
On the other hand, the injection liquid guided to the injection pipe 21 is guided to the liquid injection pipe 34 provided in the scroll compressor 11 via the strainer 22, the valve 23 and the capillary tube 24.

As shown in FIGS. 2 and 3, the injection liquid (shown by the arrow) guided to the liquid injection pipe 34 flows into the annular flow path 52 of the refrigerant flow path 51.

As shown in FIG. 3, the injection liquid flowing into the annular flow path 52 diffuses along the shape of the annular flow path 52 to fill the annular flow path 52.

The injection liquid guided to the annular flow path 52 flows out from the outer peripheral edge of the annular flow path 52 toward the back side of the fixed side end plate 71 toward the outer side in the radial direction with the central axis X as the center.

At this time, as described above, since gaps are formed at least at a plurality of locations along the circumferential direction between the outer peripheral surface of the groove portion 42 and the outer peripheral surface of the ridge portion 73, the injection liquid passes through the gaps. It will flow out in multiple directions along the circumferential direction. For example, if a gap between the outer peripheral surface of the groove portion 42 and the outer peripheral surface of the ridge portion 73 is formed over the entire circumference, the injection liquid will flow out over the entire circumference.
The shape of the gap may be devised so that the injection liquid flows out smoothly. For example, on the outer peripheral surface of the groove portion 42 and / or the outer peripheral surface of the ridge portion 73, a plurality of shallow grooves along the direction of the central axis X may be formed in the circumferential direction.

As shown in FIG. 2, the injection liquid flowing out to the back surface side of the fixed side end plate 71 is guided to the suction side of the compression chamber 61 via the back surface side of the fixed side end plate 71 and the outer peripheral side of the fixed side wall body 75. Then, it is compressed by the compression mechanism 60 together with the refrigerant guided from the evaporator 14 to the suction chamber 55.

According to this embodiment, the following effects are obtained.
Provided inside the housing 33, the suction side of the compression chamber 61 is communicated from the back surface side of the fixed side end plate 71 through the outer peripheral side of the fixed side wall body 75 in a plurality of directions along the circumferential direction with respect to the central axis X. Since the refrigerant flow path 51 is provided, the liquid refrigerant introduced as the injection liquid on the back surface side of the fixed side end plate 71 is transferred from the back surface side of the fixed side end plate 71 to the outer peripheral side of the fixed side wall body 75 by the refrigerant flow path 51. Can be guided. Therefore, the fixed scroll 70 can be cooled by the injection liquid. As a result, it is possible to suppress an increase in the temperature of the refrigerant (discharged gas) compressed in the compression chamber 61. Further, the thermal expansion of the fixed side wall body 75 can be suppressed, and the chip gap can be set small.

Further, when the injection liquid is guided from the back surface side of the fixed side end plate 71 to the suction side of the compression chamber 61 via the outer peripheral side of the fixed side wall body 75 in the entire circumferential direction with respect to the central axis X, the fixed scroll 70 is driven by the injection liquid. It can be cooled over the entire circumference. This makes it possible to cool the fixed scroll 70 more efficiently.

Further, since the injection liquid is guided to the suction side of the compression chamber 61 via the outer peripheral side of the fixed side wall body 75 by the refrigerant flow path 51, the suction refrigerant sucked into the compression chamber 61 (the refrigerant guided from the evaporator 14). ) Can be cooled. As a result, the temperature rise of the refrigerant compressed in the compression chamber 61 can be further suppressed.

Further, since the refrigerant flow path 51 through which the injection liquid flows is not formed in the fixed scroll 70, the refrigerant flow path 51 does not become a dead volume even during non-injection. Therefore, it is possible to suppress a decrease in compression efficiency during non-injection.

Further, the annular flow path 52 allows the injection liquid to flow out toward the outside in the radial direction with respect to the central axis X with a simple structure.

Further, since the refrigerant flow path 51 is defined by the discharge cover 40 and the fixed side end plate 71, the refrigerant flow path 51 is defined by a simple structure without causing a dead volume in the fixed scroll 70. be able to. Further, since the annular flow path 52 is defined by the groove portion 42 and the ridge portion 73, the annular flow path 52 can be defined by a simple structure.

Further, since a gap is formed as a part of the refrigerant flow path 51 between the outer peripheral surface of the groove portion 42 and the outer peripheral surface of the ridge portion 73, injection is performed from the outer peripheral edge of the annular flow path 52 with a simple structure. The liquid can be drained.

As shown in FIG. 4, the annular flow path 52 may be expanded in the X direction of the central axis to increase the channel cross-sectional area of the annular flow path 52.

The scroll compressor according to the embodiment of the present disclosure described as described above is grasped as follows, for example.
That is, the scroll compressor (11) according to one aspect of the present disclosure includes a fixed scroll (70) in which a spiral fixed side wall body (75) is provided on a fixed side end plate (71) and the fixed side wall body. A compression mechanism (80) having a swirling scroll (80) forming a compression chamber (61) for compressing the refrigerant together with (75) and revolving swirling relative to the central axis (X) of the fixed scroll (70). 60), a housing (33) for accommodating the compression mechanism (60) inside, and the housing (33) provided inside the housing (33) in a plurality of directions along the circumferential direction with respect to the central axis (X). It is provided with a refrigerant flow path (51) that communicates from the back surface side of the fixed side end plate (71) to the suction side of the compression chamber (61) via the outer peripheral side of the fixed side wall body (75).

The scroll compressor (11) according to this embodiment is provided inside the housing (33) and is fixed from the back side of the fixed side end plate (71) in a plurality of directions along the circumferential direction with respect to the central axis (X). Since it is provided with a refrigerant flow path (51) that communicates the suction side of the compression chamber (61) via the outer peripheral side of the side wall body (75), it is introduced as an injection liquid on the back surface side of the fixed side end plate (71). The liquid refrigerant can be guided from the back surface side of the fixed side end plate (71) to the outer peripheral side of the fixed side wall body (75) by the refrigerant flow path (51). Therefore, the fixed scroll (70) can be cooled by the injection liquid. As a result, it is possible to suppress an increase in the temperature of the refrigerant (discharged gas) compressed in the compression chamber (61). Further, the thermal expansion of the fixed side wall body (75) can be suppressed, and the chip gap can be set small.
Further, since the injection liquid is guided to the suction side of the compression chamber (61) via the outer peripheral side of the fixed side wall body (75) by the refrigerant flow path (51), the suction refrigerant sucked into the compression chamber (61) is introduced. Can be cooled. This makes it possible to further suppress the temperature rise of the refrigerant compressed in the compression chamber (61).
Further, since the refrigerant flow path (51) through which the injection liquid flows is not formed in the fixed scroll (70), the refrigerant flow path (51) does not become a dead volume even during non-injection. Therefore, it is possible to suppress a decrease in compression efficiency during non-injection.

Further, in the scroll compressor (11) according to one aspect of the present disclosure, the refrigerant flow path (51) is described from the back surface side of the fixed side end plate (71) in the entire circumferential direction with respect to the central axis (X). The suction side of the compression chamber (61) is communicated with the outer peripheral side of the fixed side wall body (75).

In the scroll compressor (11) according to this embodiment, the refrigerant flow path (51) is from the back surface side of the fixed side end plate (71) to the outer peripheral side of the fixed side wall body (75) in the entire circumferential direction with respect to the central axis (X). Since the suction side of the compression chamber (61) is communicated with the compressor chamber (61), the liquid refrigerant introduced as the injection liquid is passed from the back side of the fixed side end plate (71) to the fixed side wall in the entire circumferential direction with respect to the central axis (X). It can be guided to the outer peripheral side of the body (75). Therefore, the fixed scroll (70) can be cooled in the entire circumferential direction by the injection liquid. This makes it possible to cool the fixed scroll (70) more efficiently.

Further, in the scroll compressor (11) according to one aspect of the present disclosure, in the refrigerant flow path (51), the liquid refrigerant is introduced and the central axis (X) is on the back side of the fixed side end plate (71). ) Has an annular flow path (52) formed in an annular shape around the ring, and the outer peripheral edge of the annular flow path (52) communicates with the back surface side of the fixed side end plate (71).

In the scroll compressor (11) according to this embodiment, the refrigerant flow path (51) is formed in an annular shape around the central axis (X) on the back side of the fixed side end plate (71) while the liquid refrigerant is introduced. The annular flow path (52) has an annular flow path (52), and since the outer peripheral edge communicates with the back surface side of the fixed side end plate (71), the annular flow path (52) has a simple structure and a radius with respect to the central axis (X). The injection liquid can be discharged toward the outside in the direction.

Further, the scroll compressor (11) according to one aspect of the present disclosure includes a discharge cover (40) provided on the back side of the fixed side end plate (71), and the refrigerant flow path (51) is the same. It is defined by the discharge cover (40) and the fixed side end plate (71).

The scroll compressor (11) according to this embodiment includes a discharge cover (40) provided on the back side of the fixed side end plate (71), and the refrigerant flow path (51) has a discharge cover (40) and a fixed side. Since it is defined by the end plate (71), the refrigerant flow path (51) can be defined by a simple structure without causing a dead volume in the fixed scroll (70).

Further, in the scroll compressor (11) according to one aspect of the present disclosure, the surface of the discharge cover (40) facing the back surface of the fixed side end plate (71) is a circle around the central axis (X). An annular groove portion (42) is formed, and an annular ridge portion (73) that fits into the groove portion (42) is formed on the back surface of the fixed side end plate (71). 52) is defined by the groove portion (42) and the ridge portion (73) fitted to the groove portion (42).

In the scroll compressor (11) according to this embodiment, an annular groove portion (42) is formed around the central axis (X) on the surface of the discharge cover (40) facing the back surface of the fixed side end plate (71). An annular ridge portion (73) that fits into the groove portion (42) is formed on the back surface of the fixed side end plate (71), and the annular flow path (52) has a groove portion (42) and a groove portion (the groove portion (42). Since it is defined by the ridge portion (73) fitted to the 42), the annular flow path (52) can be defined by a simple structure.

Further, in the scroll compressor (11) according to one aspect of the present disclosure, a gap is formed between the outer peripheral surface of the groove portion (42) and the outer peripheral surface of the ridge portion (73).

In the scroll compressor (11) according to this embodiment, since a gap is formed between the outer peripheral surface of the groove portion (42) and the outer peripheral surface of the ridge portion (73), the outside of the annular flow path (52). The injection liquid can be discharged from the peripheral edge.

10 Refrigeration cycle 11 Scroll compressor 12 Condensator 13 Expansion valve 14 Evaporator 15 Refrigerant piping 20 Injection circuit 21 Injection piping 22 Strainer 23 Valve 24 Capillary tube 31 Discharge pipe 32 Suction pipe 33 Housing 33A Upper housing (housing)
33B Intermediate housing (housing)
34 Liquid injection pipe 40 Discharge cover 41 Discharge port 42 Groove 51 Refrigerant flow path 52 Circular flow path 53 Discharge chamber 54 Back pressure chamber 55 Suction chamber 60 Compression mechanism 61 Compression chamber 70 Fixed scroll 71 Fixed side end plate 72 Discharge port 73 Protrusion Part 74 Fixed part 75 Fixed side wall body 80 Swing scroll 81 Swing side end plate 85 Swing side wall body 92 Lead valve 93 Retainer 94 O-ring 95 Drive shaft 96 Electric motor 97 Support member

Claims

A spiral fixed side wall forms a fixed scroll provided on the fixed side end plate and a compression chamber for compressing the refrigerant together with the fixed side wall, and revolves relative to the central axis of the fixed scroll. With a swivel scroll, with a compression mechanism,
A housing that houses the compression mechanism inside,
Provided inside the housing, the suction side of the compression chamber is communicated from the back surface side of the fixed side end plate to the outer peripheral side of the fixed side wall body in a plurality of directions along the circumferential direction with respect to the central axis. Refrigerant flow path and
Scroll compressor equipped with.
The scroll compression according to claim 1, wherein the refrigerant flow path communicates from the back surface side of the fixed side end plate to the suction side of the compression chamber via the outer peripheral side of the fixed side wall body in the entire circumferential direction with respect to the central axis. Machine.
The refrigerant flow path has an annular flow path formed in an annular shape around the central axis on the back surface side of the fixed side end plate as the liquid refrigerant is introduced.
The scroll compressor according to claim 1 or 2, wherein the annular flow path communicates the outer peripheral edge with the back surface side of the fixed side end plate.
A discharge cover provided on the back side of the fixed side end plate is provided.
The scroll compressor according to claim 3, wherein the refrigerant flow path is defined by the discharge cover and the fixed side end plate.
An annular groove is formed around the central axis on the surface of the discharge cover facing the back surface of the fixed side end plate.
An annular ridge that fits into the groove is formed on the back surface of the fixed end plate.
The scroll compressor according to claim 4, wherein the annular flow path is defined by the groove portion and the ridge portion fitted to the groove portion.
The scroll compressor according to claim 5, wherein a gap is formed between the outer peripheral surface of the groove portion and the outer peripheral surface of the ridge portion.