Compressor and compressor system

Abstract

A compressor according to an embodiment includes a discharge valve, a discharge space formed on the downstream side of the discharge valve, an injection hole for injecting a refrigerant liquid into the discharge space, and a heat medium flow path located on the opposite side of the discharge space with respect to a partition wall forming the discharge space.

Description

Technical Field

[0001] The present invention relates to a compressor and a compressor system. Background Art

[0002] For a compressor, if the compressor overheats due to the compressed high-temperature and high-pressure gas, the density of the compressed gas inhaled by the compressor will decrease, resulting in a reduction in the compressor efficiency. Therefore, for example, in a reciprocating compressor, as a way to suppress the overheating of the compressor, pipes for cooling water to flow are provided inside the crankcase and the end cover. For example, Patent Document 1 and Patent Document 2 disclose the following structure: a refrigerant liquid is sprayed into the discharge space inside the end cover, and the latent heat of vaporization of the refrigerant liquid is used to cool the compressed discharge gas, thereby suppressing overheating.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2010-53765

[0006] Patent Document 2: Japanese Unexamined Patent Application Publication No. 2011-163192 Summary of the Invention

[0007] (1) Technical Problems to be Solved

[0008] According to the structures disclosed in Patent Document 1 and Patent Document 2, the discharge gas can be cooled and the overheating of the compressor can be suppressed. However, due to the influence of cooling, a large amount of frost may be generated on the surface of the compressor (for example, the surface of the end cover and the housing). Such a structure that generates a large amount of frost is not ideal.

[0009] The present invention is made in view of the above problems, and its object is to suppress the generation of frost on the surface of the compressor when spraying a refrigerant liquid into the discharge space of the compressor to cool the compressed discharge gas.

[0010] (2) Technical Solutions

[0011] To achieve the above object, the compressor of the present invention includes: a discharge valve, a discharge space formed on the downstream side of the discharge valve, a liquid injection hole for injecting a refrigerant liquid into the discharge space, and a heat medium flow path located on the opposite side of the discharge space across a partition wall forming the discharge space.

[0012] In addition, the compressor system of the present invention includes a low-stage compression part and a high-stage compression part, and at least the low-stage compression part is constituted by the above compressor.

[0013] As used herein, the "low-level compression section" and "high-level compression section" include: a low-level compressor and a high-level compressor each having a separate housing; and a low-level compressor and a high-level compressor housed in a single housing, such as a reciprocating compressor.

[0014] (III) Advantageous Effects

[0015] According to the compressor and compressor system of the present invention, by providing the above-described heat medium flow path, it is possible to heat the housing of the compressor including the partition wall forming the discharge space, and thus it is possible to suppress the formation of frost on the surface of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a front sectional view of a reciprocating compressor according to an embodiment.

[0017] Figure 2 is a system diagram showing the lubricating oil supply system of a reciprocating compressor according to an embodiment.

[0018] Figure 3 is a system diagram showing the lubricating oil supply system of a reciprocating compressor according to an embodiment.

[0019] Figure 4 is a system diagram of a compressor system according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, some embodiments of the present invention will be described with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings do not limit the scope of the present invention thereto, but are merely illustrative examples.

[0021] For example, expressions indicating relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" do not represent only a strictly defined arrangement, but also represent a state with tolerances or relative displacements in angles and distances to the extent that the same function can be obtained.

[0022] For example, expressions indicating that things are in an equal state such as "the same", "equal", and "homogeneous" do not represent only a strictly equal state, but also represent a state with tolerances or differences to the extent that the same function can be obtained.

[0023] For example, expressions indicating shapes such as a quadrilateral shape or a cylindrical shape do not represent only a strictly geometric quadrilateral shape, cylindrical shape, etc., but also represent shapes including concavo-convex portions, chamfered portions, etc. within the range where the same effect can be obtained.

[0024] On the other hand, expressions such as "provided with", "having", "equipped with", "including", or "having" a constituent element are not exclusive expressions that exclude the existence of other constituent elements.

[0025] Figure 1 And Figure 2 are a front elevation sectional view of a compressor 10 showing an embodiment and a system diagram of a lubricating oil supply system. In Figure 1 and Figure 2 the compressor 10 is, for example, assembled in a refrigeration device or the like and configured to compress refrigerant gas. The compressor 10 is provided with a discharge valve 12, and a discharge space Sv is formed on the downstream side of the discharge valve 12. A liquid injection hole 14 for injecting refrigerant liquid into the discharge space Sv is formed in the compressor housing 16. Similarly to Patent Document 1 and Patent Document 2, in the present embodiment, condensate of the refrigerant gas as the compressed gas is injected into the discharge space Sv from the liquid injection hole 14. The condensate evaporates in the high-temperature discharge space Sv, absorbs the latent heat of evaporation from the discharge gas Gv, and cools the discharge gas Gv. Thereby, overheating of the discharge gas Gv can be suppressed. However, if this state is maintained, as described above, frost may be generated on the surface of the housing 18 forming the discharge space Sv.

[0026] Therefore, in order to suppress frost formation on the housing 18, the compressor 10 is provided with a heat medium flow path 20, and the heat medium flow path 20 is located on the opposite side of the discharge space Sv across the partition wall 18a forming the discharge space Sv. By flowing a heat medium in the heat medium flow path 20, the housing 18 including the partition wall 18a is heated, and thus frost formation on the surface of the housing 18 can be suppressed.

[0027] In one embodiment, the compressor 10 is provided with a lubricating oil flow path 22 through which lubricating oil r supplied to a lubricated portion flows. The heat medium flow path 20 is provided in series or in parallel with the lubricating oil flow path 22. According to this embodiment, it is possible to flow in the heat medium flow path 20 the lubricating oil r that lubricates and cools the lubricated portion in the compressor 10 and has absorbed the heat of the lubricated portion. Therefore, it is possible to heat the housing 18 including the partition wall 18a forming the discharge space Sv by using the heat retained by the lubricating oil r. Thereby, frost formation on the surface of the housing 18 of the compressor 10 can be suppressed. As an example of the lubricated portion of the compressor 10, it includes at least one of a rotating body or a rotating body support portion. As a more specific example, the lubricated portion is a crankshaft 48 and a thrust bearing 50 described later. The lubricated portion may also be either the crankshaft 48 or the thrust bearing 50.

[0028] In one embodiment, as Figure 2As shown, the heat medium flow path 20 is arranged in series with respect to the lubricating oil flow path 22 to form a circulation path 24 of the lubricating oil r including the lubricated portion of the compressor 10, the heat medium flow path 20, and the lubricating oil flow path 22. In addition, an oil pump 26 for circulating the lubricating oil r is provided on the circulation path 24. According to this embodiment, the lubricating oil r circulated in the circulation path 24 by the oil pump 26 can be cooled in the heat medium flow path 20, so a dedicated oil cooler is not required, and the cost can be reduced.

[0029] Figure 3 An embodiment in which the heat medium flow path 20 is arranged in parallel with respect to the circulation path 24 is shown. In this embodiment, an oil cooler 28 is provided in the circulation path 24 of the lubricating oil flowing along the lubricated portion of the compressor 10. The lubricating oil r flowing in the circulation path 24 flows along the lubricated portion of the compressor 10, cools the lubricated portion and is heated, and is cooled in the oil cooler 28. And the compressor 10 is provided with a branch path 30 that branches from the circulation path 24, communicates with the heat medium flow path 20, and then merges with the circulation path 24. The lubricating oil r flowing in the branch path 30 exchanges heat with the discharged gas Gv through the heat medium flow path 20 to heat the discharged gas Gv. According to this embodiment, the discharged gas Gv is heated by the heat medium flow path 20, so that frost generated on the surface of the partition wall 18a or the housing 18 including the partition wall 18a can be suppressed. On the other hand, the oil cooler 28 plays a main role in cooling the lubricating oil r.

[0030] As Figure 3 shown, flow control valves 32 and 34 can be provided on the circulation path 24 and the branch path 30 respectively. In addition, only one of the flow control valve 32 and the flow control valve 34 can also be provided. By providing these flow control valves 32 and 34, the flow rate of the lubricating oil r flowing in the branch path 30 can be adjusted, so the heating capacity of the heat medium flow path 20 can be controlled. In addition, with respect to the branch portion and the merging portion of the branch path 30 with respect to the circulation path 24, it is preferably arranged such that the lubricating oil r at a temperature suitable for the heating conditions of the heat medium flow path 20 flows in the heat medium flow path 20.

[0031] In one embodiment, as Figure 1 and Figure 2As shown, the compressor 10 is a reciprocating compressor. In this case, the compressor 10 is configured such that a cylinder block 40 is housed inside a compressor housing 16, and a piston 42 reciprocates inside the cylinder block 40. A valve plate 44 for supporting a discharge valve 12 is provided on one end side of the cylinder block 40 (the upper end of the cylinder block 40 in the drawing), and an end cap is provided as a housing 18 including a partition wall 18a forming a discharge space Sv. According to such a reciprocating compressor, i.e., the compressor 10, the end cap of the housing 18 can be heated by a heat medium flowing in the heat medium flow path 20, and thus frost formation on the surface of the end cap can be suppressed. In addition, although in the present embodiment, the housing 18 of the compressor 10 is an end cap, the housing 18 is not limited to an end cap. Hereinafter, the housing 18 may sometimes be referred to as the end cap 18.

[0032] And, as Figure 1 and Figure 2 shown, a crankcase 46 is provided at the lower part of the compressor housing 16. A crankshaft 48 is supported by the crankcase 46 via a thrust bearing 50. An oil storage tank Os for lubricating oil r is formed at the bottom of the crankcase 46. The piston 42 is connected to the crankshaft 48 via a connecting rod 52, and the piston 42 reciprocates inside the cylinder block 40 by the rotation of the crankshaft 48. In Figure 1 and Figure 2 the illustrated exemplary embodiment, two cylinder blocks 40 are arranged in parallel, and the pistons 42 of the two cylinder blocks 40 are connected to the crankshaft 48 in such a manner that the pistons 42 of the two cylinder blocks 40 reciprocate with a phase difference of 180° in the rotation angle of the crankshaft 48. And, outside the crankcase 46, an electric motor 54 for rotationally driving the crankshaft 48 is provided at one end of the crankshaft 48. An oil pump 26 is provided at the other end of the crankshaft 48, and the oil pump 26 operates by the rotation of the crankshaft 48.

[0033] As Figure 2 shown, an oil filter 56 is provided in the oil storage tank Os, and the lubricating oil r is sucked from the oil storage tank Os to the lubricating oil flow path 22 by the oil pump 26. The oil pressure of the lubricating oil r flowing in the circulation path 24 is adjusted by a pressure regulating valve 58 provided at the end of the lubricating oil flow path 22. Oil passages 60 and 62 are formed on lubricated parts such as the crankshaft 48 and the thrust bearing 50. The lubricating oil r discharged from the oil pump 26 to the lubricating oil flow path 22 is supplied to these oil passages. As Figure 2 shown, a part of the oil passage 60 is led to the piston 42 via a crank pin 53. In addition, the lubricating oil r is supplied from the lubricating oil flow path 22 to the heat medium flow path 20 and warms the discharged gas Gv. The lubricating oil r that has passed through the heat medium flow path 20 returns to the oil storage tank Os through the oil passages 60 and 62 and the like. Thus, the above-described circulation path 24 of the lubricating oil r is formed.

[0034] As Figure 1As shown, an intake space Si is formed outside the cylinder block 40. When the piston 42 descends to decompress the compression space in the cylinder block 40, the compressed gas, i.e., the refrigerant gas, is sucked from the intake space Si into the compression space in the cylinder block 40 through the intake valve 63. The refrigerant gas sucked into the compression space is compressed in the compression space and discharged into the discharge space Sv. A valve cover 66 in the shape of a circular plate is press-fitted and fixed to the upper surface of the valve plate 44 by a spiral spring 64, covering the opening of the valve plate 44. A truncated conical valve plate 70 is coupled to the lower surface of the valve cover 66 by bolts 68. A discharge gas passage is formed in the valve cover 66, and a discharge valve 12 is provided. When the piston 42 ascends to increase the air pressure in the cylinder chamber, the discharge valve 12 is pushed upward to discharge the refrigerant gas into the discharge gas passage.

[0035] In one embodiment, as Figure 1 and Figure 2 shown, the compressor 10 includes a coolant flow path 72 for cooling the motor 54 for driving the compressor. The coolant flow path 72 communicates with the heat medium flow path 20. In this embodiment, the liquid coolant that cools the motor 54 and absorbs the heat retained by the motor 54 flows in the heat medium flow path 20, and the heat retained by the coolant is used to raise the temperature of the housing 18 including the partition 18a forming the discharge space Sv, so that frost formation on the surface of the housing 18 of the compressor 10 can be suppressed.

[0036] Moreover, as another embodiment, for example, warm water, antifreeze, etc. that are used as coolant in other parts of the compressor 10 and heated can also be supplied to the heat medium flow path 20 to warm the discharge space Sv.

[0037] In one embodiment, as Figure 1 shown, a sleeve 74 is provided on the outer surface of the end cap serving as the housing 18, and the sleeve 74 has a heat medium introduction space inside. The heat medium introduction space forms the heat medium flow path 20. According to this embodiment, the heat medium flow path 20 can be formed only by installing the sleeve 74 on the existing compressor without modifying other parts, so that the heat medium flow path 20 can be easily formed.

[0038] In Figure 1 the illustrated embodiment shown, an inlet hole 74a and an outlet hole 74b of the heat medium flow path 20 are formed in the sleeve 74, and lubricating oil flow paths 22 are respectively connected to the inlet hole 74a and the outlet hole 74b. And, the lubricating oil r is supplied from the inlet hole 74a to the heat medium introduction space (heat medium flow path 20) and discharged from the outlet hole 74b to the lubricating oil flow path 22. As Figure 1As shown, an inlet hole 74a and an outlet hole 74b are respectively formed at opposite ends of the shroud 74 that are away from each other. Thereby, the residence time of the lubricating oil r in the heat medium introduction space can be extended, and the heat exchange rate with the discharged gas Gv can be increased.

[0039] In one embodiment, as Figure 1 shown, the liquid injection hole 14 for injecting the refrigerant liquid into the discharge space Sv includes: a through hole 14a formed in the valve plate 44, and a communication hole 14b provided in the wall portion of the compressor housing 16 and communicating with the through hole 14a to communicate the through hole 14a with the external space. As will be described later, in a heat pump device including the compressor 10, a refrigerant path 76 branched from the outlet-side refrigerant path of the liquid receiver 88 is connected to the communication hole 14b, and the refrigerant liquid is supplied to the liquid injection hole 14 from the refrigerant path 76.

[0040] In one embodiment, as Figure 1 shown, one end of the through hole 14a opens to the discharge space Sv, and the other end of the through hole 14a communicates with the communication hole 14b.

[0041] According to this embodiment, the liquid injection hole 14 can be formed at a position avoiding the end cap 18. When it is necessary to provide a heat medium flow path 20 on the end cap 18 side and a liquid injection hole 14 is provided on the end cap 18 side, interference will occur in the installation positions of the two. In this embodiment, since the liquid injection hole 14 can be formed at a position on the valve plate 44 side avoiding the end cap 18, a layout of the liquid injection hole 14 that can avoid interference with the heat medium flow path 20 can be achieved.

[0042] In addition, in Figure 1 the illustrated exemplary embodiment shown, the communication hole 14b is formed at the upper end of the housing portion of the compressor housing 16 that surrounds the cylinder block 40. On the other hand, the communication hole 14b can also be formed in the valve plate 44. In addition, the installation position of the liquid injection hole 14 is not limited to the above embodiment, and it can also be formed at other positions, for example, formed in the end cap 18.

[0043] In one embodiment, as Figure 1 shown, the outer peripheral edge portion of the valve plate 44 is clamped between the outer peripheral edge portions of the compressor housing 16 and the end cap 18. Thus, when it is arranged in a state where the outer peripheral edge portion of the valve plate 44 is exposed to the external space of the compressor 10, it is easy to perform processing for opening the liquid injection hole 14 to the external space of the compressor 10. In addition, as Figure 1 shown, the outer peripheral edge portions of the compressor housing 16, the valve plate 44, and the end cap 18 are laminated in three layers, so that it is possible to easily fasten and join these three outer peripheral edge portions together with bolts 78. Thereby, the installation of the valve plate 44 is easy.

[0044] In one embodiment,Figure 4 The compressor system 80 shown is a two-stage compressor system that includes a low-stage compressor 82 and a high-stage compressor 84 and uses refrigerant gas as the compressed gas. The low-stage compressor 82 is composed of the compressor 10 of the above-described embodiment. Since the compressor 10 constitutes the low-stage compressor 82, frost formation on the surface of the housing 18 including the partition wall forming the discharge space can be suppressed in the low-stage compressor 82.

[0045] Regarding Figure 4 In the exemplary compressor system 80 shown, the low-stage compressor 82 and the high-stage compressor 84 are composed of reciprocating compression mechanisms. A receiver 88 is provided in the refrigerant circulation path 86. The refrigerant liquid in the receiver 88 passes through the refrigerant circulation path 86 and is decompressed by an expansion valve 90, and evaporates by absorbing the latent heat of vaporization from the load in an evaporator 92. The refrigerant gas evaporated in the evaporator 92 is sucked into the suction chamber 94 of the low-stage compressor 82, and then is sucked into a cylinder block 98 via a suction valve 96 and compressed.

[0046] The refrigerant gas compressed in the cylinder block 98 is discharged to a discharge chamber 102 through a discharge valve 100, and is discharged from the discharge chamber 102 to the refrigerant circulation path 86. After the refrigerant gas discharged to the refrigerant circulation path 86 is separated from lubricating oil by an oil separator 104, it is sucked into the suction chamber 94 of the high-stage compressor 84. The refrigerant gas sucked into the suction chamber 94 of the high-stage compressor 84 is also sucked into the cylinder block 98 via the suction valve 96, compressed, and discharged from the discharge chamber 102 to the refrigerant circulation path 86. After the refrigerant gas discharged to the refrigerant circulation path 86 is separated from lubricating oil by the oil separator 104, it is cooled and liquefied in a condenser 106.

[0047] A branch path 108 branched from the refrigerant circulation path 86 is provided on the downstream side of the receiver 88. A liquid pump 110 and a pressure regulating valve 112 are provided in the branch path 108. The branch path 108 is connected to the discharge chamber 102 of the high-stage compressor 84. The refrigerant liquid is pressurized to a pressure higher than that of the discharge chamber 102 of the high-stage compressor 84 by controlling the rotation speed of an oil pump 26 and the pressure of the pressure regulating valve 112, and is sprayed into the interior of the discharge chamber 102 from a spray nozzle 114 provided in the discharge chamber 102. The sprayed refrigerant liquid evaporates under the temperature and pressure conditions of the discharge chamber 102 to cool the discharge space.

[0048] Further, on the refrigerant circulation path 86, a branch path 116 branched from the refrigerant circulation path 86 is provided at a position downstream of the branch path 108. The branch path 116 is connected to the injection nozzle 114, and the injection nozzle 114 is provided on the inner wall surface of the discharge chamber 102 of the low-stage compressor 82. For the discharge chamber 102 of the low-stage compressor 82, since the pressure is lower than that of the branch path 116, it is possible to supply the refrigerant liquid directly to the discharge chamber 102 at the current pressure without increasing the pressure of the refrigerant liquid. Regarding the discharge chamber 102 of the low-stage compressor 82, the refrigerant liquid ejected from the injection nozzle 114 evaporates and cools under the temperature and pressure conditions of the discharge chamber 102. In this embodiment, since the compressor 10 of the above-described embodiments constitutes the low-stage compressor 82, it is possible to suppress frost formation on the surface of the housing (end cover) 18 of the compressor 10.

[0049] In addition, in Figure 4 the compressor system 80 shown, the low-stage compressor 82 and the high-stage compressor 84 may form a single two-stage compressor in which the low-stage compressor and the high-stage compressor are housed in one housing. For example, it may also be configured as a compressor system in which, in Figure 1 the compressor 10 shown, one cylinder block 40 is a low-stage compressor and the other cylinder block is a high-stage compressor.

[0050] Regarding the content described in the above embodiments, for example, it can be grasped as follows.

[0051] 1) Regarding a compressor (10) of one mode, it includes: a discharge valve (12), a discharge space (Sv) formed on the downstream side of the discharge valve, an injection hole (14) for injecting refrigerant liquid into the discharge space, and a heat medium flow path (20) located on the opposite side of the discharge space across a partition wall (18a) forming the discharge space.

[0052] According to such a structure, by providing the above heat medium flow path, it is possible to raise the temperature of the housing of the compressor including the partition wall forming the discharge space, and thus it is possible to suppress frost formation on the surface of the compressor.

[0053] 2) Regarding a compressor of another mode, as the compressor described in 1), it includes a lubricating oil flow path (22) through which lubricating oil (r) supplied to the lubricated part of the compressor flows, and the heat medium flow path (20) is provided in series or in parallel with the lubricating oil flow path (22).

[0054] According to such a structure, it is possible to flow lubricating oil that lubricates the lubricated part of the compressor and absorbs the heat of the lubricated part in the heat medium flow path. Therefore, it is possible to raise the temperature of the partition wall forming the discharge space by using the heat retained by the lubricating oil. Thereby, it is possible to suppress frost formation on the compressor housing including the partition wall.

[0055] 3) Regarding another compressor of this type, as the compressor described in 2), the heat medium flow path is arranged in series with respect to the lubricating oil flow path to form a circulation path (24) of the lubricating oil including the lubricated part, the lubricating oil flow path (22), and the heat medium flow path, and is provided with an oil pump (26) for circulating the lubricating oil within the circulation path.

[0056] According to such a structure, the lubricating oil flowing in the lubricating oil circulation path exchanges heat with the discharged gas in the heat medium flow path and is cooled by the discharged gas. Therefore, the heat medium flow path replaces the oil cooler. Thus, it is possible to reduce costs without a dedicated oil cooler.

[0057] 4) Regarding another compressor of this type, as the compressor described in any one of 1) to 3), it includes: an electric motor (54) for driving the compressor, and a coolant flow path (72) for cooling the electric motor for driving the compressor, and the coolant flow path communicates with the heat medium flow path (20).

[0058] According to such a structure, by flowing the coolant for cooling the electric motor for driving the compressor in the heat medium flow path, it is possible to use the retained heat of the coolant that has cooled the electric motor for driving the compressor and absorbed heat to raise the temperature of the compressor housing including the partition wall forming the discharge space. Therefore, it is possible to suppress the formation of frost on the surface of this compressor.

[0059] 5) Regarding another compressor of this type, as the compressor described in any one of 1) to 4), it includes: a compressor housing (16), a cylinder block (40) provided within the compressor housing, a piston (42) reciprocating within the cylinder block, a valve plate (44) provided on one end side of the cylinder block and for supporting the discharge valve, and an end cap (18) including the partition wall (18a) forming the discharge space.

[0060] According to such a structure, it is possible to raise the temperature of the above-mentioned end cap by using the heat medium flowing in the heat medium flow path. Therefore, it is possible to suppress the formation of frost on the surface of the end cap.

[0061] 6) Regarding another compressor of this type, as the compressor described in 5), it is provided with a sleeve (74) provided on the outer surface of the end cap and having a heat medium introduction space inside, and the heat medium introduction space forms the heat medium flow path (20).

[0062] According to such a structure, it is possible to form the heat medium flow path only by installing the above-mentioned sleeve on the existing compressor without the need to modify other parts. Therefore, it is easy to form the heat medium flow path.

[0063] 7) Regarding another compressor of another type, as the compressor described in 5) or 6), the liquid injection hole (14) includes: a through hole (14a) formed in the valve plate (44), and a communication hole (14b) provided in the wall portion of the compressor housing (16) and communicating with the through hole (14a) for communicating the through hole (14a) with the external space.

[0064] According to such a structure, it is necessary to provide a heat medium flow path on the end cover side. Instead of forming the liquid injection hole on the end cover side, it is formed on the valve plate side, so that interference with the heat medium flow path can be avoided, and the layout of the injection hole can be achieved.

[0065] 8) Regarding another compressor of another type, as the compressor described in any one of 5) to 7), the outer peripheral edge portion of the valve plate (44) is clamped between the outer peripheral edge portion of the compressor housing (16) and the end cover (18).

[0066] According to such a structure, by using a fastening tool such as a bolt to fasten the outer peripheral edge portions of the compressor housing, the valve plate, and the end cover together, it is easy to install the valve plate. In addition, since the end face of the outer peripheral edge portion of the valve plate is exposed to the external space, it is easy to form a liquid injection hole that communicates the discharge space with the external space.

[0067] 9) Regarding a compressor system (80) of one type, it includes a low-stage compression part (82) and a high-stage compression part (84), and at least the low-stage compression part (82) is constituted by the compressor (10) described in any one of 5) to 8).

[0068] According to such a structure, at least the low-stage compression part is constituted by the compression mechanism of each embodiment, so in the low-stage compression part, frost formation on the surface of the compressor can be suppressed.

[0069] Description of Reference Numerals

[0070] 10 - Compressor; 12, 100 - Discharge valve; 14 - Liquid injection hole; 14a - Through hole; 14b - Communication hole; 16 - Compressor housing; 18 - Housing (end cover); 18a - Partition wall (partition wall forming discharge space); 20 - Heat medium flow path; 22 - Lubricating oil flow path; 24 - Circulation path; 26 - Oil pump; 28 - Oil cooler; 30, 108, 116 - Branch path; 32, 34 - Flow control valve; 40, 98 - Cylinder block; 42 - Piston; 44 - Valve plate; 46 - Crankcase; 48 - Crankshaft; 50 - Thrust bearing; 52 - Connecting rod; 53 - Crankpin; 54 - Electric motor for driving compressor; 56 - Oil filter; 58 - Pressure regulating valve; 60, 62 - Oil passage; 63, 96 - Suction valve; 64 - Helical spring; 66 - Valve cover; 68, 78 - Bolt; 70 - Valve plate; 72 - Coolant flow path; 74 - Sleeve; 74a - Inlet hole; 74b - Outlet hole; 76 - Refrigerant path; 80 - Compressor system; 82 - Low - level compressor; 84 - High - level compressor; 86 - Refrigerant circulation path; 88 - Receiver; 90 - Expansion valve; 92 - Evaporator; 94 - Suction chamber; 102 - Discharge chamber; 104 - Oil separator; 106 - Condenser; 110 - Liquid pump; 112 - Pressure regulating valve; 114 - Injection nozzle; Gv - Discharge gas; Os - Oil storage tank; Si - Suction space; Sv - Discharge space; r - Lubricating oil.

Claims

1. A compressor, comprising: A discharge valve, A discharge space formed on the downstream side of the discharge valve, A housing including a partition wall forming the discharge space, A liquid injection hole for injecting a refrigerant liquid into the discharge space, and A heat medium flow path that is located on the opposite side of the discharge space across the partition wall forming the discharge space and through which a heat medium for heating the housing flows.

2. The compressor according to claim 1, characterized in that It has a lubricating oil flow path through which lubricating oil supplied to the lubricated part of the compressor flows, The heat medium flow path is arranged in series or in parallel with respect to the lubricating oil flow path.

3. The compressor according to claim 2, characterized in that The heat medium flow path is arranged in series with respect to the lubricating oil flow path to form a circulation path of the lubricating oil including the lubricated part, the lubricating oil flow path, and the heat medium flow path, It has an oil pump for circulating the lubricating oil in the circulation path.

4. The compressor according to any one of claims 1 to 3, characterized in that It has: A motor for driving the compressor, and A coolant flow path for cooling the motor for driving the compressor, The coolant flow path communicates with the heat medium flow path.

5. The compressor according to any one of claims 1 to 3, characterized in that It has: A compressor housing, A cylinder block provided in the compressor housing, A piston reciprocating inside the cylinder block, A valve plate provided on one end side of the cylinder block and for supporting the discharge valve, and an end cap including the partition wall forming the discharge space.

6. The compressor according to claim 5, characterized in that It has a shroud provided on the outer surface of the end cap and having a heat medium introduction space inside, The heat medium introduction space forms the heat medium flow path.

7. The compressor according to claim 5, characterized in that The liquid injection hole includes: A through hole formed in the valve plate, and A communication hole provided in the wall portion of the compressor housing and communicating with the through hole for communicating the through hole with the external space.

8. The compressor according to claim 5, characterized in that The outer peripheral edge portion of the valve plate is clamped between the outer peripheral edge portions of the compressor housing and the end cap.

9. A compressor system, comprising: A low-stage compression part, and A high-stage compression part, wherein At least the low-stage compression part is constituted by the compressor according to claim 5.

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