compressor

Abstract

Provided is a compressor that can simplify connections and electrical wiring with a condenser, an evaporator, and a pressure reducing device of a refrigerant circuit, and contribute to compactness. The compressor (1) has at least a scroll compression element (11) inside a housing (8), compresses and discharges refrigerant to a refrigerant circuit by the scroll compression element (11), and sucks in refrigerant from the refrigerant circuit, and a flow path (44) that constitutes at least a part of a path connecting a condenser and an evaporator of the refrigerant circuit is formed in a wall of the housing (8) over the entire axial direction of the housing (8).

Description

Technical Field

[0001] The present invention relates to a compressor having a compression element within a housing that compresses refrigerant and discharges refrigerant into a refrigerant circuit, and draws in refrigerant from the refrigerant circuit. Background Technology

[0002] Previously, the compression mechanism used and compressed the refrigerant in the refrigerant circuit formed a refrigeration cycle together with the condenser, pressure reducing device, and evaporator, and housed the compression element in the casing. Refrigerant was drawn into the compression element from the refrigerant circuit and discharged into the refrigerant circuit after being compressed by the compression element.

[0003] In this case, previously, because the compressor, condenser, pressure reducing device, and evaporator were connected in sequence through refrigerant piping, the overall unit became large, and the electrical wiring to the compressor and pressure reducing device also became complicated.

[0004] Therefore, structures have also been developed that integrate the hot gas flow path of the refrigerant circuit with the compressor (for example, see Patent Document 1) or integrate valve devices and the like with the compressor (for example, see Patent Document 2). Existing technical documents Patent documents

[0005] Patent Document 1: CN116787997 Patent Document 2: CN113479037 Summary of the Invention The problem that the invention aims to solve

[0006] However, even with the aforementioned conventional design, the condenser and evaporator of the refrigerant circuit still need to be connected to the compressor via relatively long refrigerant piping, and improvements are expected.

[0007] The present invention was made to solve the above-mentioned prior art problems, and its purpose is to provide a compressor that simplifies the connection and electrical wiring with the condenser, evaporator and pressure reducing device of the refrigerant circuit, and helps to make it more compact. Methods for solving problems

[0008] The compressor of the present invention is characterized in that it has at least one compression element in the housing, through which refrigerant is compressed and discharged into a refrigerant circuit, and refrigerant is drawn in from the refrigerant circuit. A flow path constituting at least a portion of the path connecting the condenser and evaporator of the refrigerant circuit is formed in the wall of the housing along the entire axial direction of the housing.

[0009] The compressor of the invention of technical solution 2 is characterized in that, in the above invention, a pressure reducing device located between the condenser and the evaporator in the refrigerant circuit is connected to the flow path and installed in the housing.

[0010] The compressor of the invention of technical solution 3 is characterized in that, in the above invention, a mounting part is formed in the housing, the mounting part is connected to the flow path and a pressure reducing device is installed thereon.

[0011] The compressor of the invention of technical solution 4 is characterized in that, in the invention of technical solution 2 or technical solution 3, the flow path is formed at a position above the vertical direction of the center of the housing.

[0012] The compressor of the invention of technical solution 5 is characterized in that, in the invention of technical solution 1, the housing includes a plurality of housing parts joined together by a plurality of bolts, flow paths are formed in each housing part and span across each housing part, and are located inside the circle connecting the outermost sides of the heads of each bolt.

[0013] The compressor of the invention of technical solution 6 is characterized in that, in the invention of technical solution 1, the housing includes a plurality of housing components joined together by a plurality of bolts, flow paths are formed in each housing component and span each housing component, and a flow path is formed between adjacent bolts.

[0014] The compressor of the invention of technical solution 7 is characterized in that, in the above invention, the flow path is formed close to either of the adjacent bolts. Invention Effects

[0015] According to the present invention, at least one compression element is provided in the housing, through which refrigerant is compressed and discharged into the refrigerant circuit, and refrigerant is drawn in from the refrigerant circuit. A flow path is formed in the wall of the housing along the entire axial direction of the housing, which constitutes at least a part of the path connecting the condenser and evaporator of the refrigerant circuit. Therefore, the housing of the compressor can constitute at least a part of the path between the condenser and the evaporator, which can help to make the refrigerant circuit more compact.

[0016] Furthermore, according to the invention of technical solution 2, based on this, the pressure reducing device located between the condenser and evaporator in the refrigerant circuit is connected to the flow path and installed in the housing. Therefore, the compressor housing constitutes the path between the condenser and evaporator including the pressure reducing device, which helps to further compact the refrigerant circuit. In particular, the compressor and pressure reducing device, which require electrical connection, can be integrated, thus simplifying the electrical wiring.

[0017] In this case, if a mounting part communicating with the flow path and installing the pressure reducing device is formed in the housing as in the invention of technical solution 3, the installation operation of the pressure reducing device into the housing also becomes easy.

[0018] Furthermore, by forming the flow path at a position above the vertical direction of the center of the housing, as in the invention of technical solution 4, it is easier to install the pressure reducing device into the housing.

[0019] Furthermore, as in the invention of technical solution 5, when the housing is composed of multiple housing components joined together by multiple bolts, and flow paths are formed in each housing component and span across each housing component, by arranging the flow path inside the circle connecting the outermost edges of the bolt heads, the tightening force of the bolts used to join the housing components can ensure the sealing of the connection of the flow path formed in each housing component and prevent refrigerant from leaking from the flow path.

[0020] This is also true in the case where a flow path is formed between adjacent bolts, as in the invention of technical solution 6. By tightening the bolts, appropriate surface pressure can be applied to the connection of the flow path formed in each housing component to prevent refrigerant leakage.

[0021] Furthermore, by forming the flow path close to either of the adjacent bolts as in the invention of technical solution 7, the tightening of the bolts allows for more appropriate application of surface pressure to the connection of the flow path formed in each housing component to prevent refrigerant leakage. Attached Figure Description

[0022] Figure 1 This is a perspective view of a heat pump unit including a compressor that applies one embodiment of the present invention. Figure 2 yes Figure 1 An exploded perspective view of a heat pump unit. Figure 3 yes Figure 1 The refrigerant circuit diagram of the heat pump unit. Figure 4 This is an explanation Figure 1 A three-dimensional diagram of the refrigerant flow inside the compressor. Figure 5 yes Figure 4 A plan view of the rear housing of the compressor. Figure 6 yes Figure 4 A longitudinal sectional perspective view of the central housing portion of the compressor. Figure 7 yes Figure 4 A partial sectional perspective view of the compressor's central housing and front housing. Figure 8 yes Figure 4 A plan view of the liquid receiver housing of the compressor. Figure 9 This is an explanation Figure 1Another three-dimensional view of the refrigerant flow inside the compressor. Figure 10 yes Figure 9 A plan view of the central shell and the front shell portion. Figure 11 yes Figure 9 A partial sectional perspective view of the central shell and the rear shell portion. Figure 12 yes Figure 1 Front view of the compressor's front casing. Figure 13 yes Figure 1 A plan view of the front casing of the compressor. Detailed Implementation

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. (1) Structure of heat pump unit 2 Figure 1 This is a perspective view of a heat pump unit 2 having an embodiment of the compressor 1 to which the present invention is applied. Figure 2 This is its exploded perspective view. The heat pump unit 2 of the embodiment is used, for example, in an air conditioning system (automotive air conditioning) for an electric vehicle. The compressor 1 of the present invention, which constitutes the refrigerant circuit R of the heat pump unit 2, draws in refrigerant, which serves as the working fluid of the air conditioning system, from the refrigerant circuit R, compresses it, and then discharges it to the refrigerant circuit R.

[0024] A compressor 1 according to an embodiment of the present invention includes: a housing 8, wherein the rear housing 3, the central housing 4, and the front housing 5, all of which are metal housing components such as aluminum, are sequentially connected axially to each other using a plurality of bolts 7 (in this case, 6 bolts), and the liquid reservoir housing 6 is mounted on the front housing 5; and a scroll compressor element 11, as an embodiment of the compression element (… Figure 2 ), housed within the central housing 4; and the motor (electric motor) 12 ( Figure 2 ), housed inside the front housing 5, driving the vortex compression element 11.

[0025] Additionally, in the figure, 13 is the discharge pressure sensor installed on the rear housing 3, 14 is the suction pressure sensor installed on the reservoir housing 6, 16 is the high-pressure side inflation valve installed on the central housing 4, and 17 is the low-pressure side inflation valve installed on the reservoir housing 6. Figure 2 ).

[0026] Furthermore, two expansion valves (electric valves) 18 and 19, which serve as pressure reducing devices, are installed in the central housing 4 of the compressor 1. In the embodiment, a heating-side heat exchanger 21 and a cooling-side heat exchanger 22 are installed in the housing 8 of the compressor 1, which are integrated with the compressor 1 to form a heat pump unit 2.

[0027] (2) Refrigerant circuit of heat pump unit 2 Figure 3 This is the refrigerant circuit diagram of the heat pump unit 2. Figure 1 as well as Figure 2 The components shown are indicated by the same reference numerals. Figure 3 .exist Figure 3 In the heat pump unit 2, 26 is the condenser of the refrigerant circuit R, which constitutes the heat pump unit 2. It is configured to exchange heat with the refrigerant-heat medium heat exchanger 27, and they are located within the aforementioned heating-side heat exchanger 21. Figure 3 In the middle, 28 is also the evaporator that constitutes the refrigerant circuit R of the heat pump unit 2, and is configured to exchange heat with the refrigerant-heat medium heat exchanger 29. They are formed in the aforementioned cooling side heat exchanger 22.

[0028] Furthermore, a heat medium circulates in the refrigerant-heat medium heat exchanger 27 of the heating-side heat exchanger 21, which is used for heating the vehicle interior; and a heat medium circulates in the refrigerant-heat medium heat exchanger 29 of the cooling-side heat exchanger 22, which is used for cooling the vehicle interior. Additionally, each indoor heat exchanger is located within the airflow path of the vehicle's HVAC unit (not shown).

[0029] The high-temperature, high-pressure gaseous refrigerant discharged after compression by the scroll compressor element 11 of compressor 1 flows into the condenser 26 of the heating-side heat exchanger 21, where it exchanges heat with the hot medium circulating to the refrigerant-heat medium heat exchanger 27, heating the hot medium and cooling and condensing the refrigerant. After being depressurized by the expansion valve 18, the condensed refrigerant flows into the evaporator 28 of the cooling-side heat exchanger 22 and evaporates. The heat absorbed at this time cools the hot medium circulating to the refrigerant-heat medium heat exchanger 29. The gaseous refrigerant flowing out of the evaporator 28 flows into the receiver housing 6, where the unevaporated liquid refrigerant is separated and then drawn into the scroll compressor element 11.

[0030] (3) Structure of compressor 1 Next, refer to Figures 4-13 The detailed construction of compressor 1 in this embodiment will be described along the flow of the refrigerant. Figure 5As shown, a discharge chamber 31 is formed within the rear housing 3 of the housing 8 constituting the compressor 1, and an outlet 32 ​​communicating with the discharge chamber 31 is formed on one side wall of the rear housing 3. Since the inlet of the condenser 26 of the heating-side heat exchanger 21 is connected to this outlet 32, the high-temperature, high-pressure gaseous refrigerant compressed by the scroll compressor element 11 is discharged through the outlet 32. Figure 4 , Figure 5 After flowing into the discharge chamber 31 as indicated by arrow A1, it flows out from the discharge port 32 and into the condenser 26.

[0031] An inlet 33 is formed on one side wall of the central housing 4 constituting the housing 8, and a mounting portion 34 for mounting the expansion valve 18 is integrally formed on the upper part of the wall of the central housing 4 above the inlet 33. Furthermore, as... Figure 6 As shown, the lower part of the mounting part 34 is connected to the inlet 33 through the flow path 36 formed in the wall of the central housing 4.

[0032] The outlet of the condenser 26 of the heating-side heat exchanger 21 is connected to the inlet 33, and the expansion valve 18 is installed in the mounting part 34, with its inlet communicating with the flow path 36 (in Figure 6 (Not shown in the image). Therefore, the refrigerant condensed in condenser 26... Figure 4 , Figure 6 As indicated by arrow A2, the fluid flows into inlet 33, then through flow path 36 into expansion valve 18, where it is depressurized.

[0033] like Figure 7 As shown, a central housing side flow path 41 is formed in the wall of one side of the central housing 4. The central housing side flow path 41 is located at a position higher in the vertical direction than the center of the central housing 4, and is formed in the direction of the front housing 5 along the entire axial direction of the central housing 4. One end of the central housing side flow path 41 opens at the mounting part 34 and communicates with the outlet of the expansion valve 18, and the other end opens on the end face of the central housing 4 on the front housing 5 side.

[0034] On the other hand, such as Figure 7 , Figure 13 As shown, a front housing side flow path 42 is formed in the wall of one side of the front housing 5. The front housing side flow path 42 is located vertically above the center of the front housing 5 and is formed in the direction towards the reservoir housing 6 along the entire axial direction of the front housing 5. One end of the front housing side flow path 42 opens on the end face of the central housing 4 side of the front housing 5, and this opening corresponds to the opening of the central housing side flow path 41 on the end face of the central housing 4.

[0035] Therefore, when the central housing 4 and the front housing 5 are joined by bolts 7, the flow path 41 on the central housing side and the flow path 42 on the front housing side are connected to form a continuous flow path 44. This flow path 44 extends from the central housing 4 to the front housing 5, extends along its entire axial direction within the wall of the housing 8, and the outlet of the expansion valve 18 communicates with this flow path 44.

[0036] An outlet 43 is formed on the upper part of one side wall of the front housing 5, and the other end of the front housing side flow path 42 is connected to the outlet 43. The inlet of the evaporator 28 of the cooling side heat exchanger 22 is connected to the outlet 43, so the refrigerant after being depressurized by the expansion valve 18, such as... Figure 4 , Figure 7 As indicated by arrow A3, the refrigerant flows through flow path 44, exits from outlet 43, and flows into evaporator 28. Therefore, flow path 44 constitutes the path connecting condenser 26 and evaporator 28 of refrigerant circuit R (in... Figure 3 (Represented by a dashed box X1). The location of the refrigerant circuit R of flow path 44 is shown in [the diagram]. Figure 3 .

[0037] On one side of the wall of the front housing 5 constituting the housing 8, an inlet 46 is formed on the side of the liquid receiver housing 6. When the liquid receiver housing 6 is engaged with the front housing 5, this inlet 46 communicates with the interior of the liquid receiver housing 6. Since the outlet of the evaporator 28 of the cooling-side heat exchanger 22 is connected to this inlet 46, the refrigerant evaporated in the evaporator 28... Figure 4 , Figure 8 As indicated by arrow A4, after flowing into the inlet 46, the liquid flows into the reservoir housing 6, where the gas and liquid are separated.

[0038] Then, the gaseous refrigerant, after being separated into gas and liquid within the receiver housing 6, such as Figure 4 As indicated by arrow A5, it passes through the front housing 5 and enters the central housing 4, where it is drawn into the vortex compressor element 11.

[0039] A rear housing side hot air flow path 47 is formed on the other side of the rear housing 3, one end of which communicates with the discharge chamber 31. The other end of the rear housing side hot air flow path 47 is open on the end face of the central housing 4 side of the rear housing 3. Figure 10 ).

[0040] In the wall on the other side of the central housing 4 that constitutes the housing 8, a first central housing side hot air flow path 48 is formed along the entire axial direction. One end of the first central housing side hot air flow path 48 opens on the end face of the rear housing 3 side of the central housing 4, and this opening corresponds to the opening of the rear housing side hot air flow path 47 on the end face of the rear housing 3.

[0041] Therefore, when the rear housing 3 and the central housing 4 are joined by bolts 7, the hot air flow path 47 on the rear housing side is connected to the hot air flow path 48 on the first central housing side, forming a continuous flow path of hot air 49. This hot air flow path 49 extends along its entire axial direction within the wall of the housing 8. Figure 10 ).

[0042] A mounting portion 51 for mounting the expansion valve 19 is integrally formed on the upper part of the wall on the other side of the central housing 4. Furthermore, as... Figure 10 As shown, the lower part of the mounting portion 51 is connected to the other end of the first central housing side hot air flow path 48 formed within the wall of the central housing 4. Thus, the high-temperature gaseous refrigerant in the exhaust chamber 31... Figure 9 , Figure 10 As indicated by arrow A6, the hot gas flows into expansion valve 19 through hot gas path 49 and is depressurized by expansion valve 19.

[0043] like Figure 11 As shown, a second central housing-side hot air flow path 52 is formed inside the wall on the other side of the central housing 4. This second central housing-side hot air flow path 52 is located vertically above the center of the central housing 4 and is formed in the direction towards the front housing 5 along the entire axial direction of the central housing 4. One end of the second central housing-side hot air flow path 52 opens at the mounting portion 51 and communicates with the outlet of the expansion valve 19, and the other end opens on the end face of the central housing 4 on the front housing 5 side.

[0044] On the other hand, such as Figure 11 As shown, a front housing-side hot air flow path 56 is formed inside the wall on the other side of the front housing 5. This front housing-side hot air flow path 56 is located vertically above the center of the front housing 5 and is formed in the direction towards the reservoir housing 6 along the entire axial direction of the front housing 5. One end of the front housing-side hot air flow path 56 opens on the end face of the central housing 4 side of the front housing 5, and this opening corresponds to the opening of the second central housing-side hot air flow path 48 on the end face of the central housing 4.

[0045] Therefore, when the central housing 4 and the front housing 5 are joined by bolts 7, the second central housing side hot air flow path 48 is connected to the front housing side hot air flow path 56, forming a continuous hot air flow path 57. This hot air flow path 57 extends from the central housing 4 to the front housing 5, extends along its entire axial direction within the wall of the housing 8, and the expansion valve 19 communicates with this hot air flow path 57.

[0046] Since the other end of the hot gas flow path 56 on the front housing side is connected to the inside of the liquid receiver housing 6, the high-temperature refrigerant (hot gas refrigerant) after being depressurized by the expansion valve 19, such as Figure 11As indicated by arrow A7, the refrigerant flows into the receiver housing 6 via hot gas path 57. Therefore, hot gas path 57 forms the path connecting the expansion valve 19 of the refrigerant circuit R to the receiver housing 6 (in... Figure 3 (represented by the dashed box X2) is part of it.

[0047] The locations of the refrigerant circuit R of the hot air flow path 57 and the aforementioned hot air flow path 49 are also shown in... Figure 3 Therefore, a portion of the high-temperature refrigerant (hot gas refrigerant) discharged from the scroll compressor element 11 is directly delivered to the liquid receiver housing 6 via the expansion valve 19, thereby increasing the temperature of the discharged gas.

[0048] As described above, in this invention, a flow path 44 that forms part of the path connecting the condenser 26 and the evaporator 28 of the refrigerant circuit R is formed in the wall of the housing 8 along the entire axial direction of the housing 8. Therefore, the housing 8 of the compressor 1 can form part of the path between the condenser 26 and the evaporator 28, which can help to make the refrigerant circuit R more compact.

[0049] Furthermore, in this embodiment, since the expansion valve 18, located between the condenser 26 and the evaporator 28 in the refrigerant circuit R, is connected to the flow path 44 and installed in the housing 8, the housing 8 of the compressor 1 forms a path between the condenser 26 and the evaporator 28, including the expansion valve 18, which further contributes to the compactness of the refrigerant circuit R. In particular, the compressor 1 and the expansion valve 18, which require electrical connection, can be integrated, thus simplifying the electrical wiring.

[0050] Furthermore, in this embodiment, a mounting portion 34 communicating with the flow path 44 and mounting the expansion valve 18 is formed in the housing 8, thus facilitating the installation of the expansion valve 18 into the housing 8. Moreover, since the flow path 44 is formed vertically upwards from the center of the housing 8, the installation of the expansion valve 18 into the housing 8 is made even easier.

[0051] Figure 12 This indicates the open end face on the center housing 4 side of the front housing 5. In this figure, 61-66 are threaded holes for the bolt 7 to be inserted and screwed in, with a specified pitch circle diameter (PCD). Figure 12 Six threaded holes (represented by a circle C1 with a single-dot dash) are formed. In the embodiment, the threaded holes 61-63 are located vertically above the center of the front housing 5 (housing 8).

[0052] In addition, threaded holes are also formed in the same location in the rear housing 3 and the central housing 4 (in Figure 2(Referring to the figure by reference numeral 60) In the embodiment, each bolt 7 is inserted into the threaded hole 60 of the rear housing 3, and enters the threaded holes 61-63 of the front housing 5 through the threaded hole 60 of the central housing 4 and is screwed in, thereby joining the rear housing 3, the central housing 4 and the front housing 5.

[0053] Furthermore, as described above, one end of the front housing side flow path 42 constituting the flow path 44 opens on the end face of the center housing 4 side of the front housing 5, and one end of the front housing side hot air flow path 56 constituting the hot air flow path 57 also opens on the end face of the center housing 4 side of the front housing 5.

[0054] In this configuration, the front housing side flow path 42 (flow path 44) and the front housing side hot air flow path 56 (hot air flow path 57) are located inside the circle connecting the outermost edges of the heads 7A of each bolt 7. That is, the front housing side flow path 42 (flow path 44) and the front housing side hot air flow path 56 (hot air flow path 57) are located inside the circle connecting the outermost edges of the heads 7A of each bolt 7 that joins the central housing 4 and the front housing 5. Therefore, by tightening the bolts 7 used to join the central housing 4 and the front housing 5, the sealing of the connection between the flow path 44 and the hot air flow path 57 can be ensured, thereby preventing refrigerant leakage from the flow paths.

[0055] Furthermore, the front housing side flow path 42 (flow path 44) opens in region F1 between adjacent threaded holes 62 and 63, and is formed close to one of the threaded holes 63. Additionally, the front housing side hot air flow path 56 (hot air flow path 57) opens in region F2 between adjacent threaded holes 61 and 66, and is formed close to one of the threaded holes 66.

[0056] Specifically, in the region F1 between adjacent threaded holes 62 and 63, the front housing side flow path 42 (one flow path 44) is formed close to one of the threaded holes 63. Furthermore, in the region F2 between adjacent threaded holes 61 and 66, the front housing side hot air flow path 56 (one hot air flow path 57) is formed close to one of the threaded holes 66. Thus, by tightening the bolts 7, appropriate surface pressure can be applied to the connection between the flow path 44 and the hot air flow path 56 to prevent refrigerant leakage.

[0057] Additionally, in this embodiment, flow path 44 constitutes part of the path connecting the condenser 26 and evaporator 28 of the refrigerant circuit R, but it could also constitute the entire path. Furthermore, in Figure 1 The diagram shows expansion valves 18 and 19 installed in the respective mounting parts 34 and 51, but they can be installed either when the compressor 1 is shipped from the warehouse or when it is assembled into the vehicle, and are therefore included in the present invention in either case.

[0058] Furthermore, while a scroll electric compressor 1 has been described as an example in the embodiments, the invention is not limited to this, and is applicable to various compressors. Furthermore, the specific shapes of the components shown in the embodiments are not limited to these, and modifications can be made without departing from the spirit of the invention. Explanation of reference numerals in the attached figures:

[0059] 1: Compressor; 2: Heat pump unit; 3: Rear housing (housing component); 4: Central housing (housing component); 5: Front housing (housing component); 6: Liquid receiver (housing component); 7: Bolt; 7A: Head; 8: Housing; 11: Scroll compressor element (compression element); 12: Motor; 18, 19: Expansion valve (pressure reducing device); 26: Condenser; 28: Evaporator; 34, 51: Mounting part; 41: Central housing side flow path; 42: Front housing side flow path; 44: Flow path; 60~66: Threaded hole.

Claims

1. A compressor, characterized in that, The compressor has at least one compression element inside the housing, which compresses the refrigerant and discharges it into the refrigerant circuit, and also draws in refrigerant from the refrigerant circuit. A flow path constituting at least a portion of the path connecting the condenser and evaporator of the refrigerant circuit is formed within the wall of the housing along the entire axial direction of the housing.

2. The compressor according to claim 1, characterized in that, The pressure reducing device located between the condenser and evaporator in the refrigerant circuit is connected to the flow path and installed in the housing.

3. The compressor according to claim 2, characterized in that, A mounting portion is formed in the housing, which communicates with the flow path and mounts the pressure reducing device.

4. The compressor according to claim 2 or 3, characterized in that, The flow path is formed at a position that is vertically upwards from the center of the housing.

5. The compressor according to claim 1, characterized in that, The housing comprises multiple housing components joined together by multiple bolts. The flow paths are formed in each of the housing components and span across each housing component, and are located inside the circle that connects the outermost edges of the heads of each of the bolts.

6. The compressor according to claim 1, characterized in that, The housing comprises multiple housing components joined together by multiple bolts. The flow paths are formed in each of the housing components and span each housing component, and one is formed between adjacent bolts.

7. The compressor according to claim 6, characterized in that, The flow path is formed approximately on either of the adjacent bolts.

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