EP2549109A2

EP2549109A2 - Scroll compressor

Info

Publication number: EP2549109A2
Application number: EP12177142A
Authority: EP
Inventors: Yoshiaki Miyamoto
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Priority date: 2011-07-22
Filing date: 2012-07-19
Publication date: 2013-01-23
Anticipated expiration: 2032-07-19
Also published as: JP5832187B2; EP2549109A3; EP2549109B1; JP2013024152A

Abstract

A scroll compressor includes a relief port (31A) composed of a plurality of holes for communicating between a compression chamber and a discharge chamber at the outer circumferential side of a discharge port. A plate member (36) is provided corresponding to a portion where at least the relief port (31A) composed of the plurality of holes are opened on an end surface of an end plate of a fixed scroll (16). A single relief flow path (37) integrates the plurality of holes constituting the relief port (31A) into one between the plate member (36) and the end surface of the end plate of the fixed scroll (16), and is communicated with the discharge chamber at the position away from the position of the relief port (31A). A relief valve (34A) is provided at an opening (39) for the discharge chamber in the relief flow path (37).

Description

Technical Field

The present invention relates to a scroll compressor including a discharge port at a central portion of an end plate of a fixed scroll and also including a plurality of relief ports at an outer side of the discharge port.

{Background Art}

In a scroll compressor, a design compression ratio, which is decided by a ratio between the volume of a compression chamber when suction is shut off and the volume of the compression chamber when compression is completed, is constant. Accordingly, an appropriate design compression ratio for an operating condition that provides a specific suction pressure and discharge pressure can be set, so that the scroll compressor can be operated with high efficiency. However, under the operating condition for reducing the difference between high and low pressures or under the operating condition for providing high Hz using an inverter, the excessive compression phenomenon occurs. Thus, the compression efficiency is reduced by the increase of compression force. Furthermore, when the so-called liquid compression phenomenon is generated, the pressure is excessively increased. Thus, the increase of input, the excessive vibration, and the noise are caused.
To avoid the excessive compression and the liquid compression in a scroll compressor, relief ports for communicating between a compression chamber and a discharge chamber are provided at an outer side in a spiral direction of a spiral wrap in addition to a discharge port provided at a central portion of an end plate of a fixed scroll. By relieving gases and liquids that are being compressed to the discharge chamber through the relief ports, the excessive compression and the liquid compression are prevented (for example, see Patent Literature 1).
Furthermore, according to Patent Literatures 2 and 3, in a scroll compressor including relief ports, the relief ports are composed of a plurality of holes provided in a spiral direction of a spiral wrap to secure an area necessary for the relief ports. The relief ports composed of the plurality of holes are integrated into one and a common relief valve is provided for the integrated relief ports. Thus, the difficulty of installation of relief valves caused by the increase of the number of the relief valves and the complexity of the structure can be eliminated.

Citation List

Patent Literature

PTL 1 Japanese Unexamined Patent Application, Publication No. Hei 9-170574
PTL 2 Japanese Unexamined Patent Application, Publication No. 2008-286095
PTL 3 Japanese Unexamined Patent Application, Publication No. 2011-102579

Summary of Invention

Technical Problem

According to Patent Literatures 2 and 3, the relief ports composed of the plurality of holes are integrated into one and the common relief valve is provided for the integrated relief ports. Thus, the area necessary for the relief ports can be ensured and the increase of the number of relief valves can be prevented. Consequently, the complexity of the structure can be avoided. However, in the scroll compressor disclosed in Patent Literatures 2 and 3, it is required that the relief valve is disposed corresponding to the position of the relief ports, and accordingly, the installation position for the relief valve is constrained by the position of the relief ports. Thus, the relief valve cannot be freely disposed.
Especially when the relief ports composed of the plurality of holes are provided at two or more positions to have different orbiting angles in the spiral direction of the spiral wrap of the fixed scroll, the relief port provided on the inside of the spiral wrap comes close to the relief port provided on the outside of the spiral wrap. Accordingly, the installation of relief valves may become difficult. Thus, it is important to secure the design freedom of the arrangement of the relief valves.
An object of the present invention, which has been accomplished under the above-mentioned circumstances, is to provide a scroll compressor which can reduce the pressure loss during discharge from relief ports to improve the efficiency, and which can minimize the number of relief valves and avoid the complexity of the structure to enhance the design freedom.

{Solution to Problem}

To achieve the above-mentioned object, the present invention provides the following solutions.
A scroll compressor according to an aspect o the present invention includes: compression chambers provided by a fixed scroll and an orbiting scroll to compress gas and discharge the gas to a discharge chamber through a discharge port provided at a central portion of an end plate of the fixed scroll; relief ports composed of a plurality of holes provided at an outer circumferential side of the discharge port to communicate between the compression chambers and the discharge chamber; a plate member corresponding to a portion where at least the relief ports composed of the plurality of holes are opened on an end surface of the end plate of the fixed scroll; a single relief flow path provided between the plate member and the end surface of the end plate of the fixed scroll for integrating the plurality of holes constituting the relief ports into one and communicating with the discharge chamber at a position away from positions where the relief ports are provided; and relief valves provided on an opening for the discharge chamber in the relief flow path.
According to the aspect of the present invention, in the scroll compressor including the relief ports composed of the plurality of holes for communicating between the compression chambers and the discharge chamber at the outer circumferential side of the discharge port, the plate member is provided corresponding to the portion where at least the relief ports composed of the plurality of holes are opened on the end surface of the end plate of the fixed scroll. The single relief flow path integrates the plurality of holes constituting the relief ports into one between the plate member and the end surface of the end plate of the fixed scroll, and is communicated with the discharge chamber at the position away from the positions where the relief ports are provided. The relief valves are provided on the opening for the discharge chamber in the relief flow path. Accordingly, it is not always necessary that the relief valves are provided corresponding to the positions where the relief ports composed of the plurality of holes are provided. It is only necessary that one common relief valve is provided for the relief ports composed of the plurality of holes to be away from the positions where the relief ports are provided. Thus, the relief valve can be installed by effectively using a limited space and an area necessary for the relief ports composed of the plurality of holes can be ensured. Consequently, the pressure loss during discharge from the relief ports can be reduced to improve the efficiency, and the number of the relief valves can be minimized and the complexity of the structure can be avoided to enhance the design freedom of the arrangement of the relief valves. The installation of the relief valves in the limited space can be facilitated.
In the scroll compressor according to the aspect of the present invention, in the relief flow path, an integration part for integrating the plurality of holes constituting the relief ports into one is provided on the end surface of the end plate of the fixed scroll, and the opening for the discharge chamber is provided on the plate member.
According to the aspect of the present invention, the integration part for integrating the plurality of holes constituting the relief ports into one in the relief flow path is provided on the end surface of the end plate of the fixed scroll, and the opening for the discharge chamber is provided on the plate member. By providing the integration part for integrating the plurality of holes constituting the relief ports into one on the end plate of the fixed scroll, only the opening for the discharge chamber is provided on the plate member. Thus, the structure can be simplified. For example, the plate member can be relatively thinned.
In the scroll compressor according to the aspect of the present invention, in the relief flow path, all of the integration part for integrating the plurality of holes constituting the relief ports into one and the opening for the discharge chamber are provided on the plate member.
According to the aspect of the present invention, all of the integration part for integrating the plurality of holes constituting the relief ports into one in the relief flow path and the opening for the discharge chamber are provided on the plate member. By providing all of the components in the relief flow path on the plate member, the installation and the processing of the relief flow path can be gathered on the plate member. Thus, only the relief ports are provided on the fixed scroll, and can be used without particularly changing the structure.
In the scroll compressor according to the aspect of the present invention, a seal surface between the end surface of the end plate of the fixed scroll and the plate member that are in metallic contact with each other, and a seal material is not used.
According to the aspect of the present invention, the seal surfaces of the end surface of the end plate of the fixed scroll and the plate member are in metallic contact with each other, and the seal material is not required. Accordingly, the seal surface between the plate member and the end surface of the end plate of the fixed scroll including the connecting part between the relief ports and the relief flow path is provided without the seal material. The seal material does not need to be used. Consequently, the structure can be simplified and the number of parts can be reduced, whereby the cost is reduced.
In the scroll compressor according to the aspect of the present invention, the relief ports composed of the plurality of holes are provided corresponding to a pair of the compression chambers shifted from each other by 180 degrees using the fixed scroll and the orbiting scroll, and are provided at two or more positions to have different orbiting angles in a spiral direction of a spiral wrap of the fixed scroll.
According to the aspect of the present invention, the relief ports composed of the plurality of holes are provided corresponding to the pair of compression chambers shifted from each other by 180 degrees using the fixed scroll and the orbiting scroll, and are provided at two or more positions to have different orbiting angles in the spiral direction of the spiral wrap of the fixed scroll. Even when the relief ports provided at the inside of the spiral wrap comes close to the relief ports provided on the outside of the spiral wrap, the relief valves can be positioned away from the positions where the relief ports are provided. Accordingly, the plurality of pairs of relief valves can be easily provided. Thus, the relief ports can be provided in various manners and the performance of the scroll compressor can be enhanced.

Advantageous Effects of Invention

According to the present invention, it is not always required that the relief valves are provided corresponding to the positions where the relief ports composed of the plurality of holes are provided. It is only required that one common relief valve is provided for the relief ports composed of the plurality of holes to be away from the positions where the relief ports are provided. Accordingly, the relief valve can be positioned by effectively using a limited space. Since an area necessary for the relief ports composed of the plurality of holes can be ensured, the discharge pressure loss during discharge from the relief ports can be reduced to improve the efficiency, and the number of the relief valves can be minimized and the complexity of the structure can be avoided to enhance the design freedom of the arrangement of the relief valves. The installation of the relief valves in the limited space can be facilitated.

Brief Description of Drawings

Fig. 1
Fig. 1 is a longitudinal sectional view showing an entire scroll compressor according to a first embodiment of the present invention.
Fig. 2
Fig. 2 is a plan view showing a fixed scroll in the scroll compressor shown in Fig. 1 as viewed from the side close to a spiral wrap.
Fig. 3
Fig. 3 is an enlarged view showing an arrangement around relief ports composed of a plurality of holes provided in the fixed scroll shown in Fig. 2.
Fig. 4
Fig. 4 is a cross-sectional view taken along the line A-A of Fig. 3.
Fig. 5
Fig. 5 is a cross-sectional view taken along the line A-A of Fig. 3, which corresponds to Fig. 4 for explaining a scroll compressor according to a second embodiment of the present invention.

Description of Embodiments

Embodiments of the present invention will be explained below with reference to the accompanying drawings.

First Embodiment

A first embodiment of the present invention will be explained below with reference to Figs. 1 to 4.
Fig. 1 is a longitudinal sectional view showing an entire scroll compressor according to the first embodiment of the present invention, and Fig. 2 is a plan view showing a fixed scroll in the scroll compressor as viewed from the side close to a spiral wrap.
In this embodiment, the scroll compressor is described as a sealed electric scroll compressor 1, but the present invention is not limited thereto.
The sealed electric scroll compressor 1 includes a sealed housing 2 made of steel and shaped like a vertically long bottomed cylinder. A scroll compression mechanism 3 is provided on the upper portion and an electric motor 4 is provided on the lower portion inside the sealed housing 2.
In the sealed housing 2, the portion above the scroll compression mechanism 3 serves as a discharge chamber 5 for discharging high-pressure gas compressed by the scroll compression mechanism 3, and a discharge pipe 6 is connected to the discharge chamber 5. The portion below the scroll compression mechanism 3 serves as a suction chamber 7 for sucking low-pressure suction gas, and a suction pipe 8 is connected to the suction chamber 7. The electric motor 4 composed of a stator 9 and a rotor 10 is press-fitted in the suction chamber 7 of the sealed housing 2. A crankshaft 11 connected to the rotor 10 of the electric motor 4 extends in the vertical direction.
The lower end portion of the crankshaft 11 is supported by a lower bearing 12 provided in the sealed housing 2. Lubricant oil 14 filled in the bottom portion of the sealed housing 2 is supplied to portions necessary to be lubricated in the scroll compression mechanism 3 and an upper bearing member 15 through oil supply holes (not shown) provided in the crankshaft 11 using a conventional oil supply pump 13 provided between the lower end portion of the crankshaft 11 and the lower bearing 12. Accordingly, the portions necessary to be lubricated can be lubricated.
The scroll compression mechanism 3 is provided in the sealed housing 2 via the upper bearing member 15. The scroll compression mechanism 3 includes a fixed scroll 16 that is fixed on the upper bearing member 15 and an orbiting scroll 20 that is orbitably supported around the fixed scroll 16 on the upper bearing member 15. The fixed scroll 16 includes a fixed end plate 17 and a fixed spiral wrap 18 standing upright on one surface of the fixed end plate 17. A discharge port 19 is provided at the central portion of the fixed end plate 17.
The orbiting scroll 20 includes an orbiting end plate 21 and an orbiting spiral wrap 22 standing upright on one surface of the orbiting end plate 21. An orbiting boss 23 is integrally provided on the rear surface of the orbiting end plate 21. The fixed scroll 16 and the orbiting scroll 20 are provided so that the fixed spiral wrap 18 and the orbiting spiral wrap 22 are engaged with each other to be shifted from each other by 180 degrees. Accordingly, a pair of compression chambers 24 are provided between the scrolls 16 and 20. The pair of compression chambers 24 are structured to move from the outer circumferential position to the central position while reducing their volumes when the orbiting scroll 20 orbits so as to provide the compression effect.
The rear surface of the orbiting end plate 21 is supported on a thrust bearing 15A of the upper bearing member 15. A crankpin 11A provided on the upper end of the crankshaft 11 is connected to the orbiting boss 23 via a drive bush 25 and an orbiting bearing 26. Thus, the orbiting scroll 20 can orbit around the fixed scroll 16. A rotation-preventing means 27 composed of an Oldham ring for preventing the rotation of the orbiting scroll 20 is provided between the rear surface of the orbiting end plate 21 of the orbiting scroll 20 and the thrust bearing 15A of the upper bearing member 15. The upper portion of the crankshaft 11 is rotatably supported by a journal bearing 15B of the upper bearing member 15.
A discharge cover 28 and a discharge valve 29 that is a reed valve for opening and closing the discharge port 19 are provided on the rear surface of the fixed end plate 17 of the fixed scroll 16. The fixed end plate 17 of the fixed scroll 16 includes a plurality of pairs of relief ports 30A and 308, 31A and 31B, and 32A, and 32B each having a plurality of holes connecting the compression chambers 24 to the discharge chamber 5 at a plurality of positions (three positions in this embodiment) having different orbiting angles in the spiral direction of the fixed spiral wrap 18 on the outer circumferential side of the discharge port 19 provided at the central portion of the fixed end plate 17 of the fixed scroll 16.
As shown in Fig. 2, the plurality of pairs of relief ports 30A and 30B, 31A and 31B, and 32A and 32B each having the plurality of holes are provided on the outside and inside of the fixed spiral wrap 18, and are communicated with the pair of compression chambers 24 formed on the outside and inside of the fixed spiral wrap 18. The pair of relief ports 30A and 30B each having two holes are shifted from each other by 180 degrees to have a predetermined orbiting angle at the outer circumferential side of the discharge port 19. The pair of relief ports 31A and 31B each having three holes are shifted from each other by 180 degrees to have a predetermined orbiting angle at the outer circumferential side of the relief ports 30A and 30B. Furthermore, the pair of relief ports 32A and 32B each having two holes are shifted from each other by 180 degrees to have a predetermined orbiting angle at the outer circumferential side of the relief ports 31A and 31B.
Pairs of reed valve type relief valves 33A and 33B to 35A and 35B are provided corresponding to the plurality of pairs of relief ports 30A and 30B, 31A and 31B, and 32A and 32B each having the plurality of holes. The arrangement of the relief valves 33A and 33B to 35A and 35B will be described below with reference to Figs. 3 and 4 by explaining the arrangement of the relief valve 34A provided for the relief port 31A as a typical example.
The relief port 31A composed of three holes is provided in the spiral direction of the fixed spiral wrap 18 on the fixed end plate 17 of the fixed scroll 16. A plate member 36 is in metallic contact with the rear surface of the fixed end plate 17. The three holes constituting the relief port 31A are integrated in a single flow path on the surface where the plate member 36 is in metallic contact with the rear surface of the fixed end plate 17. A relief flow path 37 is communicated with the discharge chamber 5.
In this embodiment, an integration part 38 for integrating the three holes constituting the relief port 31A in the relief flow path 37 into the single flow path is provided to form a spot facing on the fixed end plate 17 of the fixed scroll 16. An opening 39 connecting the integration part 38 to the discharge chamber 5 is provided on the plate member 36. The reed valve type relief valve 34A is provided on the opening 39 communicated with the discharge chamber 5 in the relief flow path 37 via a retainer 41 that is connected to the fixed end plate 17 and the plate member 36 by a bolt 40.
In this embodiment, the plurality of pairs of the relief ports 30A and 30B, 31A and 31B, and 32A and 32B are provided at three positions to have different orbiting angles in the spiral direction of the fixed spiral wrap 18. However, it is not required that the relief ports are provided at the three positions. The relief ports may be provided at one or two, or more than three positions. At this time, it is not required that all of the relief valves 33A and 33B to 35A and 35B corresponding to the relief ports 30A and 30B, 31A and 31B, and 32A and 32B are disposed away from the positions of the relief ports via the relief flow path 37 as described above. For more convenient arrangement, the plurality of holes may be integrated into one and some particular relief valves may be provided at the one place on the opening to be communicated with the discharge chamber 5.
The following advantageous effects can be obtained due to the structure as described above according to the embodiment.
When the electric motor 4 is driven in the sealed electric scroll compressor 1, low-pressure refrigerant gas is sucked in the sealed housing 2 through the suction pipe 8, and then is delivered into the compression chambers 24 of the scroll compression mechanism 3 through a refrigerant flow path provided on the upper bearing member 15 and the like. The refrigerant gas sucked in the compression chambers 24 is compressed by high-temperature and high-pressure gas when the orbiting scroll 20 is driven to orbit around the fixed scroll 16 and the compression chambers 24 are moved to the central portion from the outer circumferential position while the volume of the compression chambers 24 is reduced.
The compressed gas is discharged into the discharge chamber 5 via the discharge port 19 and the discharge valve 29 provided at the central portion of the fixed scroll 16, and is delivered to the outside of the compressor through the discharge pipe 6 connected to the discharge chamber 5. In the process of the compression, the excessive compression state may be caused depending on the operating condition, or the pressure in the compression chambers 24 may be excessively increased by liquid compression. When the gas is delivered from the compression chambers 24 to the discharge port 19, either one of pairs of the relief ports 30A and 30B, 31A and 31B, and 32A and 32B are communicated with the discharge chamber 5 by opening the corresponding pair of the relief valves 33A and 33B, 34A and 34B, and 35A and 35B. Then, the high-pressure gas or liquid is relieved in the discharge chamber 5 through the relief ports and the relief flow path 37.
The high-pressure gas or liquid relieved from either one of pairs of the relief ports 30A and 30B, 31A and 31B, and 32A and 32B each having the plurality of holes is gathered into the single relief flow path 37 at the integration part 38, and is relieved into the discharge chamber 5 from the opening 39 through the relief flow path 37 by opening the relief valves 33A and 33B to 35A and 35B. Thus, the excessive compression or liquid compression can be prevented.
In this embodiment, the plate member 36 is provided corresponding to the portions where the relief ports 30A, 30B, 31A, 31B, 32A, and 32B composed of the plurality of holes are opened on the end surface of the fixed end plate 17 of the fixed scroll 16. The plurality of holes constituting the relief ports 30A, 30B, 31A, 31B, 32A, and 32B are integrated into one between the plate member 36 and the end surface of the fixed end plate 17. The single relief flow path 37 communicated with the discharge chamber 5 is provided away from the positions of the relief ports. Furthermore, the relief valves 33A and 33B to 35A and 35B are provided at the opening 39 for the discharge chamber 5 in the relief flow path 37.
It is not always required that the relief valves 33A and 33B to 35A and 35B are provided corresponding to the positions of the relief ports 30A and 30B, 31A and 31B, and 32A and 32B each having the plurality of holes. It is only required that one common relief valve of relief valves 33A and 33B to 35A and 35B is provided for the relief ports 30A, 30B, 31A, 31B, 32A, and 32B each having the plurality of holes to be away from the positions of the relief ports. Thus, the relief valves 33A and 33B to 35A and 35B can be provided by effectively using the limited space, while the area necessary for relief ports 30A, 30B, 31A, 31B, 32A, and 32B each having the plurality of holes can be ensured.
Consequently, the discharge pressure loss during discharge from each relief port 30A, 30B, 31A, 31B, 32A, 32B can be reduced, so that the efficiency can be improved. Furthermore, the number of the relief valves 33A and 33B to 35A and 35B can be minimized and the complexity of the structure can be avoided. The freedom of the arrangement of the relief valves 33A and 33B to 35A and 35B can be enhanced, so that the installation of the relief valves 33A and 33B to 35A and 35B in the limited space can be facilitated.
In the relief flow path 37, the integration part 38 for gathering the plurality of holes comprising the relief ports 30A, 30B, 31A, 31B, 32A, and 32B at one place is provided on the end surface of the fixed end plate 17 of the fixed scroll 16, and the opening 39 for the discharge chamber 5 is provided on the plate member 36. Since the integration part 38 for gathering the plurality of holes comprising the relief ports 30A, 30B, 31A, 31B, 32A, and 32B at one place is provided on the side close to the fixed end plate 17 of the fixed scroll 16, only the opening 39 for the discharge chamber 5 is provided on the plate member 36. Thus, the structure can be simplified. For example, the plate member 36 can be relatively thinned.
In this embodiment, the seal surfaces of the end surface of the fixed end plate 17 of the fixed scroll 16 and the plate member 36 are in metallic contact with each other, and the seal material is not required. Thus, the seal surface between the plate member 36 and the end surface of the fixed end plate 17 including a connecting portion between the relief ports 30A, 30B, 31A, 361B, 32A, and 32B, and the relief flow path 37 can be provided without the seal material. Consequently, the structure can be simplified and the number of parts can be reduced, whereby the cost is reduced.
The relief ports 30A, 30B, 31A, 31B, and 32A, and 32B composed of the plurality of holes are provided corresponding to the pair of the compression chambers 24 shifted from each other by 180 degrees using the fixed scroll 16 and the orbiting scroll 20, and are provided at two or more positions (three positions in this embodiment) having different orbiting angles in the spiral direction of the spiral wrap 18 of the fixed scroll 16. Thus, the relief ports 30B, 31B, and 32B provided on the inside of the spiral wrap 18 may come close to the relief ports 30A, 31A, and 32A provided on the outside of the spiral wrap 18.
Even when the relief ports 30B, 31B, and 32B are provided to be close to the relief ports 30A, 31A, and 32A, the relief valves 33A and 33B to 35A and 35B can be positioned away from the position of each relief port. Accordingly, the plurality of pairs of the relief valves 33A and 33B to 35A and 35B can be easily disposed. Thus, the relief ports 30A, 30B, 31A, 31B, 32A, and 32B can be provided at various positions, so that the performance of the scroll compressor 1 can be improved.

Second Embodiment

Next, a second embodiment of the present invention will be explained with reference to Fig. 5.
As compared to the first embodiment, the relief flow path 37A is differently provided in the second embodiment. The other structures in the second embodiment are the same as those in the first embodiment, and the explanation thereof is omitted.
As shown in Fig. 5, the entire relief flow path 37A, which is provided on the contact surface between the fixed end plate 17 of the fixed scroll 16 and the plate member 36, is integrally provided on the side of the plate member 36 according to this embodiment. In other words, the integration part 38A for gathering the plurality of holes of the relief ports 30A, 30B, 31A, 31B, 32A, and 32B comprising the relief flow path 37A to one place and the opening 39A for the discharge chamber 5 are provided on the side of the plate member 36. Incidentally, in Fig. 5, the relief valves and the like provided in the opening 39A are omitted.
Since the integration part 38A for gathering the plurality of holes of the relief ports 30A, 30B, 31A, 31B, 32A, and 32B comprising the relief flow path 37A between the fixed end plate 17 and the plate member 36 to one place and the opening 39A for the discharge chamber 5 are provided on the side of the plate member 36, the entire relief flow path 37A can be provided on the side of the plate member 36. The installation and the processing of the relief flow path 37A can be collectively carried out on the side of the plate member 36. Thus, only relief ports 30A, 30B, 31A, 31B, 32A, and 32B can be provided on the side of the fixed scroll 16, and can be used without particularly changing the structure.
The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and scope of the present invention. For example, the sealed electric scroll compressor 1 is explained in the embodiment, but an open-type scroll compressor with a power source provided outside may be used in a similar manner. Furthermore, the number of the pairs of relief ports composed of the plurality of holes on the inside provided in the spiral direction of the fixed spiral wrap 18 may be different from the number of the relief ports composed of the plurality of holes on the outside. The number of the relief ports provided on the inside may be large.

{Reference Signs List}

1 scroll compressor
5 discharge chamber
16 fixed scroll
17 fixed end plate
18 fixed spiral wrap
19 discharge port
20 orbiting scroll
24 compression chamber
30A, 30B, 31A, 31B, 32A, 32B relief port
33A, 33B, 34A, 34B, 35A, 35B relief valve
36 plate member
37, 37A relief flow path
38, 38A integration part
39, 39A opening

Claims

A scroll compressor (1), being characterized in that it comprises:
compression chambers (24) provided by a fixed scroll (16) and an orbiting scroll (20) to compress gas and discharge the gas to a discharge chamber (5) through a discharge port (19) provided at a central portion of an end plate (17) of the fixed scroll (16);

relief ports (30A, 30B, 31A, 31B, 32A, 32B) composed of a plurality of holes provided at an outer circumferential side of the discharge port (19) to communicate between the compression chambers (24) and the discharge chamber (5);

a plate member (36) corresponding to a portion where at least the relief ports (30A, 30B, 31A, 31B, 32A, 32B) composed of the plurality of holes are opened on an end surface of the end plate (17) of the fixed scroll (16);

a single relief flow path (37;37A) provided between the plate member (36) and the end surface of the end plate (17) of the fixed scroll (16) for integrating the plurality of holes constituting the relief ports (30A, 30B, 31A, 31B, 32A, 32B) into one and communicating with the discharge chamber (5) at a position away from positions where the relief ports (30A, 30B, 31A, 31B, 32A, 32B) are provided; and

relief valves (33A, 33B, 34A, 34B, 35A, 35B) provided on an opening (39;39A) for the discharge chamber (5) in the relief flow path (37;37A).
The scroll compressor (1) according to claim 1, wherein, in the relief flow path (37;37A), an integration part (38;38A) for integrating the plurality of holes constituting the relief ports (30A, 30B, 31A, 31B, 32A, 32B) into one is provided on the end surface of the end plate (17) of the fixed scroll (16), and the opening for the discharge chamber (5) is provided on the plate member (36).
The scroll compressor (1) according to claim 1, wherein, in the relief flow path (37;37A), all of an integration part (38;38A) for integrating the plurality of holes constituting the relief ports (30A,30B,31A,31B,32A,32B) into one and the opening (39;39A) for the discharge chamber (5) are provided on the plate member (36).
The scroll compressor (1) according to any one of claims 1 to 3, wherein seal surfaces between the end surface of the end plate (17) of the fixed scroll (16) and the plate member (36) are in metallic contact with each other, and a seal material is not used.
The scroll compressor (1) according to any one of claims 1 to 4, wherein the relief ports (30A, 30B, 31A, 31B, 32A, 32B) composed of the plurality of holes are provided corresponding to a pair of the compression chambers (24) shifted from each other by 180 degrees using the fixed scroll (16) and the orbiting scroll (20), and are provided at two or more positions to have different orbiting angles in a spiral direction of a spiral wrap (18) of the fixed scroll (16).