Scroll compressor

Abstract

A high-pressure dome-type scroll compressor includes a first passage component (12) and a second passage component (70). The first passage component (12) is connected to the suction passage of the fixed scroll (40) to guide the low-pressure fluid to the compression mechanism. The second passage component (70) is connected to the injection passage of the fixed scroll (40) to guide the medium-pressure fluid to the compression mechanism. The fixed end plate (41) of the fixed scroll (40) has a mounting portion (60) bulging on the back side thereof. Both the first passage component (12) and the second passage component (70) are mounted on the mounting portion (60).

Description

Technical Field

[0001] The present disclosure relates to a scroll compressor and a refrigeration device. Background Art

[0002] Patent Document 1 discloses a high-pressure dome-type scroll compressor having a suction pipe that penetrates a housing and is connected to a fixed scroll disk to guide low-pressure refrigerant to a compression chamber.

[0003] In a high-pressure dome-type scroll compressor, the fixed scroll is exposed to the high-temperature and high-pressure refrigerant that fills the shell. Therefore, if no measures are taken, the low-pressure refrigerant will be heated by the high-pressure refrigerant in the shell during the process of reaching the compression chamber from the suction pipe. As a result, the density of the low-pressure refrigerant sucked into the compression chamber decreases, and the operating efficiency of the scroll decreases. Specifically, the mass of the refrigerant sucked into the compression chamber decreases with each rotation of the movable scroll.

[0004] Therefore, the scroll compressor of Patent Document 1 reduces the amount of heat transferred to the low-pressure refrigerant flowing in the suction pipe by surrounding the suction pipe with the intake pipe.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Publication No. 07-133771 Summary of the invention

[0008] -Technical problem to be solved by the invention-

[0009] The scroll compressor of Patent Document 1 has an intake pipe which is not included in a general scroll compressor. Therefore, the scroll compressor of Patent Document 1 has an increased number of parts due to the provision of the intake pipe, and the manufacturing process becomes complicated.

[0010] An object of the present disclosure is to improve the operating efficiency of a scroll compressor without increasing the number of components of the scroll compressor.

[0011] -Technical solutions to solve technical problems-

[0012] The first aspect disclosed is a high-pressure dome-type scroll compressor 10, including a compression mechanism 30 and a shell 11, wherein the compression mechanism 30 has a fixed scroll plate 40 and a movable scroll plate 50, and a compression chamber 31 is formed by the fixed scroll plate 40 and the movable scroll plate 50, and the shell 11 accommodates the compression mechanism 30, and the high-pressure dome-type scroll compressor 10 ejects the fluid compressed by the compression mechanism 30 into the internal space of the shell 11. The scroll compressor 10 includes a first passage member 12 and a second passage member 70, wherein the first passage member 12 guides a low-pressure fluid from the outside of the housing 11 to the compression mechanism 30, and the second passage member 70 guides a medium-pressure fluid from the outside of the housing 11 to the compression mechanism 30, the fixed scroll plate 40 has a fixed end plate portion 41 and a fixed scroll 42 protruding from a front side 41a of the fixed end plate portion 41, and a suction passage 44 and an injection passage 47 are formed on the fixed end plate portion 41, the suction passage 44 is connected to the first passage member 12, and guides the low-pressure fluid to the compression chamber 31, and the injection passage 47 is connected to the second passage member 70, and guides the medium-pressure fluid to the compression chamber 31, and the fixed end plate portion 41 has a mounting portion 60, the mounting portion 60 bulges on the back side of the fixed end plate portion 41, and both the first passage member 12 and the second passage member 70 are mounted on the mounting portion 60.

[0013] In the first aspect, a mounting portion 60 is formed on the stationary end plate portion 41 of the stationary scroll 40. On the mounting portion 60, both a first passage component 12 for low-pressure fluid flow and a second passage component 70 for medium-pressure fluid flow are mounted. The low-pressure fluid after flowing into the compression mechanism 30 from the first passage component 12 and the medium-pressure fluid after flowing into the compression mechanism 30 from the second passage component 70 are in contact with the mounting portion 60. The mounting portion 60 exposed to the high-pressure fluid in the housing 11 is cooled by the medium-pressure fluid supplied from the second passage component 70 to the compression mechanism 30. Therefore, the temperature rise of the low-pressure fluid flowing while in contact with the mounting portion 60 can be suppressed. As a result, the density reduction of the low-pressure fluid flowing into the compression chamber 31 can be suppressed, thereby improving the operating efficiency of the scroll compressor 10.

[0014] The disclosure of the second aspect is based on the disclosure of the first aspect. The injection passage 47 penetrates the static end plate portion 41 along the thickness direction of the static end plate portion 41. The second passage component 70 includes an injection pipe 14 and a connecting component 71. The injection pipe 14 penetrates the shell 11 and is arranged at a position offset from the axial direction of the injection passage 47. The connecting component 71 is installed on the mounting portion 60 and connects the injection pipe 14 and the injection passage 47.

[0015] In the second aspect, the second passage member 70 includes the injection pipe 14 and the connection member 71. The injection pipe 14 is provided at a position offset from the axial direction of the injection passage 47. Therefore, the spacing between the suction pipe 12 and the injection pipe 14 can be ensured.

[0016] The third aspect of the disclosure is a refrigeration device 100, which includes a refrigerant circuit 101 connected to the scroll compressor 10 of the first or second aspect of the disclosure, so that the refrigerant circulates in the refrigerant circuit 101 to perform a refrigeration cycle.

[0017] In the third aspect, the scroll compressor 10 sucks and compresses the refrigerant of the refrigerant circuit 101. In the refrigerant circuit 101, the refrigerant discharged from the scroll compressor 10 circulates. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a piping system diagram showing a refrigerant circuit of a refrigeration device;

[0019] Figure 2 is a longitudinal sectional view of a compression mechanism of a scroll compressor;

[0020] Figure 3 is a three-dimensional diagram of the compression mechanism after omitting the cover portion;

[0021] Figure 4 is a top view of the compression mechanism;

[0022] Figure 5 is shown along Figure 4 A cross-sectional view of a section cut along the V-V line;

[0023] Figure 6 It is a three-dimensional diagram of the static scroll. DETAILED DESCRIPTION

[0024] Next, a scroll compressor 10 according to an embodiment will be described. The scroll compressor 10 is connected to a refrigerant circuit 101 of a refrigeration device 100 and compresses a refrigerant which is a fluid.

[0025] - Refrigeration equipment -

[0026] Reference Figure 1 A refrigeration device 100 including a scroll compressor 10 will be described.

[0027] In the refrigerant circuit 101 of the refrigeration device 100, a scroll compressor 10 of this embodiment, a heat source side heat exchanger 102, a utilization side heat exchanger 103, a subcooling heat exchanger 104, a four-way reversing valve 105, an expansion valve 106 and an injection valve 107 are provided.

[0028] The suction pipe 12 and the discharge pipe 13 of the scroll compressor 10 are respectively connected to the four-way reversing valve 105. The gas side end of the heat source side heat exchanger 102 is connected to the four-way reversing valve 105. The liquid side end of the heat source side heat exchanger 102 is connected to the inlet of the first flow path 104a of the subcooling heat exchanger 104. The outlet of the first flow path 104a of the subcooling heat exchanger 104 is connected to one end of the expansion valve 106. The other end of the expansion valve 106 is connected to the liquid side end of the utilization side heat exchanger 103. The gas side end of the utilization side heat exchanger 103 is connected to the four-way reversing valve 105.

[0029] One end of the injection valve 107 is connected to a pipe connecting the first flow path 104a of the subcooling heat exchanger 104 and the expansion valve 106. The other end of the injection valve 107 is connected to the inlet of the second flow path 104b of the subcooling heat exchanger 104. The outlet of the second flow path 104b of the subcooling heat exchanger 104 is connected to the injection pipe 14 of the scroll compressor 10.

[0030] The heat source side heat exchanger 102 and the utilization side heat exchanger 103 are heat exchangers for performing heat exchange between the refrigerant and the air. The subcooling heat exchanger 104 is a heat exchanger for performing heat exchange between the refrigerant flowing in the first flow path 104a and the refrigerant flowing in the second flow path 104b. The expansion valve 106 and the injection valve 107 are electronic expansion valves with variable openings. The four-way reversing valve 105 is a switching valve for switching between the cooling operation and the heating operation of the refrigeration device 100.

[0031] During cooling operation, the four-way reversing valve 105 becomes Figure 1 In the state shown by the solid line in FIG, the heat source side heat exchanger 102 functions as a condenser, and the utilization side heat exchanger 103 functions as an evaporator. During the cooling operation, the high-pressure refrigerant ejected from the scroll compressor 10 is sent to the heat source side heat exchanger 102, the low-pressure refrigerant evaporated in the utilization side heat exchanger 103 is sucked into the scroll compressor 10, and the medium-pressure refrigerant evaporated in the second flow path 104b of the subcooling heat exchanger 104 flows into the injection pipe 14 of the scroll compressor 10.

[0032] During heating operation, the four-way reversing valve 105 becomes Figure 1 In the state shown by the middle dotted line, the utilization side heat exchanger 103 functions as a condenser, and the heat source side heat exchanger 102 functions as an evaporator. During the heating operation, the high-pressure refrigerant ejected from the scroll compressor 10 is sent to the utilization side heat exchanger 103, the low-pressure refrigerant evaporated in the heat source side heat exchanger 102 is sucked into the scroll compressor 10, and the medium-pressure refrigerant evaporated in the second flow path 104b of the subcooling heat exchanger 104 flows into the injection pipe 14 of the scroll compressor 10.

[0033] -Overall structure of scroll compressor-

[0034] like Figure 1 As shown, the scroll compressor 10 is a fully hermetic compressor. In the scroll compressor 10, a compression mechanism 30 and an electric motor 20 are housed in a casing 11 which is a hermetic container.

[0035] The housing 11 is a cylindrical pressure container with both ends closed. The housing 11 is disposed with its axial direction in the up-and-down direction.

[0036] The shell 11 is provided with a suction pipe 12 and a discharge pipe 13. The suction pipe 12 is a component for introducing low-pressure refrigerant from the outside of the shell 11 into the compression mechanism 30. The suction pipe 12 passes through the upper end of the shell 11 and is connected to the compression mechanism 30. The discharge pipe 13 is a component for leading the high-pressure refrigerant discharged from the compression mechanism 30 to the outside of the shell 11. The discharge pipe 13 passes through the body of the shell 11 and opens in the internal space of the shell 11.

[0037] The shell 11 is further provided with an injection pipe 14. The injection pipe 14 passes through the upper end of the shell 11 and is connected to the compression mechanism 30. The injection pipe 14 is a component for introducing the intermediate-pressure refrigerant from the outside of the shell 11 into the compression mechanism 30.

[0038] The motor 20 is disposed below the compression mechanism 30 in the housing 11. The motor 20 is connected to the compression mechanism 30 via a drive shaft 25, and drives the compression mechanism 30.

[0039] A lower bearing member 15 is provided at a lower portion in the housing 11 . The lower bearing member 15 constitutes a journal bearing for supporting the drive shaft 25 .

[0040] - Compression mechanism structure -

[0041] like Figure 2 As shown, the compression mechanism 30 includes a cover 35, a fixed scroll 40, a movable scroll 50, and an Oldham coupling 32. The cover 35 is fixed to the housing 11. The fixed scroll 40 is arranged on the upper surface of the cover 35. The movable scroll 50 is arranged between the fixed scroll 40 and the cover 35.

[0042] The cover portion 35 is a disk-shaped member with a recessed center, and constitutes a journal bearing for supporting the drive shaft 25 .

[0043] The fixed scroll 40 includes a fixed end plate portion 41, a fixed scroll 42, and an outer peripheral wall portion 43. The fixed end plate portion 41 is a slightly thick flat plate-shaped portion. The fixed scroll 42 is formed into a scroll wall shape that describes an involute curve and protrudes from the front side 41a of the fixed end plate portion 41. The outer peripheral wall portion 43 is formed to surround the outer peripheral side of the fixed scroll 42 and protrude from the front side of the fixed end plate portion 41. The protruding end surface of the fixed scroll 42 is roughly flush with the protruding end surface of the outer peripheral wall portion 43.

[0044] The movable scroll 50 includes a movable end plate 51, a movable scroll 52, and a convex column 55. The movable end plate 51 is formed in a substantially circular flat plate shape. The movable scroll 52 is formed in a vortex wall shape that describes an involute curve, and the front side ( Figure 2 The boss portion 55 is formed into a cylindrical shape and is arranged on the back side ( Figure 2 The eccentric portion 27 of the drive shaft 25 is inserted into the boss portion 55.

[0045] The Oldham coupling 32 is disposed between the orbiting scroll 50 and the cover 35. The Oldham coupling 32 is engaged with the orbiting scroll 50 and the cover 35, respectively, to restrict the orbiting scroll 50 from rotating.

[0046] In the compression mechanism (30), a compression chamber (31) is formed by the fixed scroll (40) and the movable scroll (50). In the compression mechanism (30), a plurality of compression chambers (31) are formed by the fixed scroll (42) and the movable scroll (52) meshing with each other.

[0047] -Static scroll disc-

[0048] Refer to the appropriate Figure 2 to Figure 6 The fixed scroll 40 will be described.

[0049] like Figure 2 , Figure 3 As shown in FIG. 1 , a discharge port 45 is formed on the static end plate 41. The discharge port 45 is a through hole formed in the center of the static end plate 41. The discharge port 45 is open at the front side 41a and the back side 41b of the static end plate 41. The discharge port 45 forms a passage for guiding the refrigerant compressed in the compression chamber 31 to the internal space of the shell 11.

[0050] like Figure 6 As shown in FIG. 1 , a mounting portion 60 is formed on the static end plate portion 41. The mounting portion 60 is a portion that bulges on the back side of the static end plate portion 41. The mounting portion 60 is formed near the outer peripheral edge of the static end plate portion 41. When viewed from above, the mounting portion 60 is in a long and narrow shape that extends roughly along the outer peripheral edge of the static end plate portion 41. The protruding end surface ( Figure 6 The upper surface in the figure is a machined flat surface.

[0051] like Figure 2 , Figure 5 , Figure 6 As shown, a suction passage 44 is formed on the fixed scroll 40. The suction passage 44 is a longitudinal hole extending from the mounting portion 60 of the fixed end plate portion 41 along the outer peripheral wall portion 43. One end of the suction passage 44 is open at the protruding end surface 61 of the mounting portion 60. The suction passage 44 is a passage for guiding low-pressure refrigerant to the compression chamber 31.

[0052] like Figure 5 , Figure 6 As shown, an injection passage 47 is formed in the fixed scroll 40. The injection passage 47 is a through hole formed in the fixed end plate portion 41. The central axis of the injection passage 47 extends in the up-down direction.

[0053] One end of the injection passage 47 opens at the protruding end surface 61 of the mounting portion 60. The other end of the injection passage 47 opens at the front surface 41a of the static end plate 41. The injection passage 47 is a passage for introducing the intermediate-pressure refrigerant to the compression chamber 31 in the middle of compression (in other words, in a closed state).

[0054] - First passage component (suction pipe) -

[0055] like Figure 2 to Figure 5 As shown, a first passage member is mounted on the mounting portion 60 of the static end plate 41. In the scroll compressor 10 of this embodiment, the suction pipe 12 constitutes the first passage member. The suction pipe 12 introduces low-pressure refrigerant from the outside of the shell 11 into the compression mechanism 30.

[0056] The suction pipe 12 includes a main pipe part 12a and a sub-pipe part 12b. The suction pipe 12 forms a low-pressure passage 12c through which low-pressure refrigerant flows. The low-pressure passage 12c is connected to the suction passage 44 formed on the fixed scroll 40.

[0057] The main pipe component 12a is a circular tubular component. The main pipe component 12a is provided to penetrate the top of the housing 11. One end of the main pipe component 12a is inserted into the suction passage 44 from the protruding end surface 61 side of the mounting portion 60. The main pipe component 12a is connected to the suction passage 44. The other end of the main pipe component 12a is exposed to the outside of the housing 11.

[0058] The sub-pipe member 12b is a circular tubular member. One end of the sub-pipe member 12b is inserted into the other end of the main pipe member 12a. The other end of the sub-pipe member 12b is connected to a pipe constituting the refrigerant circuit 101.

[0059] - Second passage member -

[0060] like Figure 2 to Figure 5 As shown, a second passage component 70 is mounted on the mounting portion 60 of the static end plate portion 41. The second passage component 70 includes a connecting component 71, a joint component 73 and an injection pipe 14.

[0061] The connecting member 71 is a block-shaped member with a long transverse length. The connecting member 71 is fixed to the mounting portion 60 of the static end plate portion 41 by three bolts 74. The lower surface of the connecting member 71 is in close contact with the protruding end surface 61 of the mounting portion 60.

[0062] The connection member 71 has an internal passage 72 formed therein. The internal passage 72 is a long and narrow passage extending in the length direction of the connection member 71. The inlet end of the internal passage 72 is bent upward and is opened at the upper surface of one end of the connection member 71. The outlet end of the internal passage 72 is bent downward and is opened at the lower surface of the other end of the connection member 71. The outlet end of the internal passage 72 overlaps with one end of the injection passage 47 opened at the protruding end surface 61 of the mounting portion 60. The internal passage 72 is connected to the injection passage 47.

[0063] A joint component 73 is installed at one end of the connecting component 71. The joint component 73 is a short round tube-shaped component with a slightly thick wall. The joint component 73 is installed on the connecting component 71 with its axial direction in the up-down direction. Figure 5 The lower end of the connecting member 71 is inserted into the inlet end of the internal passage 72 which opens on the upper surface of the connecting member 71.

[0064] The injection pipe 14 is a circular tubular component. The injection pipe 14 is arranged with the axial direction in the vertical direction and penetrates the top of the shell 11. The axial direction of the injection pipe 14 is substantially parallel to the axial direction of the injection passage 47 and is offset in the lateral direction relative to the axial direction of the injection passage 47. One end of the injection pipe 14 is connected to the other end of the joint component 73 ( Figure 5 The other end of the injection pipe 14 is exposed to the outside of the shell 11. The other end of the injection pipe 14 is connected to a pipe constituting the refrigerant circuit 101.

[0065] The internal space of the injection pipe 14 and the internal space of the joint member 73 together with the internal passage 72 of the connecting member 71 form an intermediate pressure passage 75 through which the intermediate pressure refrigerant flows. The intermediate pressure passage 75 is connected to the injection passage 47 and guides the intermediate pressure refrigerant to the injection passage 47.

[0066] It should be noted that the joint member 73 may be omitted in the second passage member 70 . In this case, the injection pipe 14 is directly connected to the inlet end of the internal passage 72 of the connecting member 71 .

[0067] - Operation of scroll compressor -

[0068] In the scroll compressor 10 , the movable scroll 50 of the compression mechanism 30 is driven by the motor 20 to perform an orbiting motion. When the movable scroll 50 moves, the low-pressure refrigerant flowing into the suction passage 44 from the suction pipe 12 flows into the compression chamber 31 .

[0069] As the orbiting scroll (50) moves, the compression chamber (31) moves from the outer peripheral end toward the center end of the fixed scroll (42), and the volume of the compression chamber (31) decreases accordingly, so that the refrigerant in the compression chamber (31) is compressed.

[0070] The intermediate-pressure refrigerant flowing in the injection pipe 14 is introduced into the compression mechanism 30. The intermediate-pressure refrigerant flowing in the injection pipe 14 flows into the injection passage 47 through the joint member 73 and the connection member 71 in sequence, and is then introduced into the compression chamber 31 in the middle of compression.

[0071] The refrigerant compressed in the compression chamber 31 is ejected from the compression chamber 31 to the space above the compression mechanism 30 in the shell 11 through the ejection port 45. The high-pressure refrigerant ejected from the compression mechanism 30 flows into the space below the cover portion 35 in the shell 11, and then flows out to the outside of the shell 11 through the ejection pipe 13.

[0072] - Using medium-pressure refrigerant to cool the fixed scroll -

[0073] In the scroll compressor 10 of the present embodiment, the fixed scroll 40 is exposed to the high-temperature and high-pressure refrigerant ejected from the compression mechanism 30. Therefore, not only the portion near the center of the fixed scroll 40 where the ejection port 45 is formed is heated by the refrigerant ejected from the compression mechanism 30, but also the portion near the outer periphery of the fixed scroll 40 where the suction passage 44 is formed is heated by the refrigerant ejected from the compression mechanism 30.

[0074] Therefore, if no measures are taken, the low-pressure refrigerant supplied from the suction pipe 12 to the compression mechanism 30 will be heated and its density will decrease while passing through the suction passage 44 of the fixed scroll 40. If the density of the low-pressure refrigerant flowing from the suction passage 44 into the compression chamber 31 decreases, the mass of the low-pressure refrigerant sucked into the compression chamber 31 during one rotation of the movable scroll 50 will decrease, and the operating efficiency of the scroll compressor 10 will decrease.

[0075] On the other hand, in the scroll compressor 10 of the present embodiment, both the suction pipe 12, which is the first passage member, and the connecting member 71 constituting the second passage member 70 are mounted on one mounting portion 60 formed on the fixed scroll 40. Both the suction passage 44 and the injection passage 47 are also formed on the one mounting portion 60.

[0076] The temperature of the intermediate-pressure refrigerant flowing in the injection passage 47 is lower than the temperature of the high-pressure refrigerant ejected from the compression mechanism 30. Therefore, in the compression mechanism 30 of the present embodiment, the intermediate-pressure refrigerant having a lower temperature than the high-pressure refrigerant flows near the peripheral portion of the suction passage 44 in the fixed scroll 40. Thus, the peripheral portion of the suction passage 44 in the fixed scroll 40 is cooled by the intermediate-pressure refrigerant flowing in the injection passage 47. As a result, the temperature rise of the low-pressure refrigerant in the process of passing through the suction passage 44 of the fixed scroll 40 can be suppressed, thereby improving the operating efficiency of the scroll compressor 10.

[0077] Here, in the existing scroll compressor, the following structure is sometimes adopted: on the static end plate of the static scroll, two mounting parts bulging on the back side of the static end plate are formed, and the first passage component, that is, the suction pipe 12, is mounted on one mounting part, and the second passage component 70 is mounted on the other mounting part. In this structure, the thickness of the portion between the two mounting parts of the static end plate is thinner than the thickness of the portion of the static end plate where the mounting part is formed. Therefore, in the static scroll, the relatively thin portion formed between the two mounting parts will hinder the heat conduction from the peripheral part of the suction passage to the peripheral part of the injection passage.

[0078] On the other hand, as described above, in the scroll compressor 10 of the present embodiment, both the suction pipe 12, which is the first passage member, and the connecting member 71 constituting the second passage member 70 are mounted on the one mounting portion 60 formed on the fixed scroll 40. Both the suction passage 44 and the injection passage 47 are also formed on the one mounting portion 60. Therefore, in the fixed scroll 40 of the present embodiment, the entire region between the portion where the suction passage 44 is formed and the portion where the injection passage 47 is formed becomes a portion of the fixed end plate 41 with a relatively thick thickness.

[0079] Therefore, compared with the conventional structure in which the mounting portion for the suction pipe and the mounting portion for the second passage member are separately formed on the fixed scroll, the fixed scroll 40 of the present embodiment can promote heat conduction from the portion where the suction passage 44 is formed to the portion where the injection passage 47 is formed. As a result, the temperature rise of the low-pressure refrigerant in the process of passing through the suction passage 44 of the fixed scroll 40 can be suppressed, thereby improving the operating efficiency of the scroll compressor 10.

[0080] - Features of the embodiment (1) -

[0081] In the scroll compressor 10 of the present embodiment, a mounting portion 60 is formed on the static end plate portion 41 of the static scroll 40. On the mounting portion 60, both the suction pipe 12 for the low-pressure refrigerant to flow and the second passage component 70 for the medium-pressure refrigerant to flow are mounted. The low-pressure refrigerant after flowing into the compression mechanism 30 from the suction pipe 12 and the medium-pressure refrigerant after flowing into the compression mechanism 30 from the second passage component 70 are in contact with the mounting portion 60. The mounting portion 60 exposed to the high-pressure refrigerant in the shell 11 is cooled by the medium-pressure refrigerant supplied from the second passage component 70 to the compression mechanism 30. Therefore, the temperature rise of the low-pressure refrigerant flowing while contacting the mounting portion 60 can be suppressed. As a result, the density reduction of the low-pressure refrigerant flowing into the compression chamber 31 can be suppressed, thereby improving the operating efficiency of the scroll compressor 10.

[0082] - Features of the embodiment (2) -

[0083] In the scroll compressor 10 of this embodiment, the second passage member 70 includes the injection pipe 14 and the connection member 71. The injection pipe 14 is provided at a position offset from the axial direction of the injection passage 47. Therefore, the distance between the suction pipe 12 and the injection pipe 14 can be ensured.

[0084] The pipes constituting the refrigerant circuit 101 are connected to the suction pipe 12 and the injection pipe 14 by brazing or the like. According to this embodiment, since the distance between the suction pipe 12 and the injection pipe 14 can be ensured, the operation of connecting the pipes to the suction pipe 12 and the injection pipe 14 can be easily performed.

[0085] The above describes the implementation and variants, but it should be understood that various changes can be made to their form and details without departing from the spirit and scope of the claims. As long as the functions of the objects of the present disclosure are not affected, the above implementation and variants can also be appropriately combined or replaced. The words "first", "second", "third"... in the specification and claims are only used to distinguish the sentences containing the above words, and do not limit the number and order of the sentences.

[0086] - Industrial Applicability -

[0087] In summary, the present disclosure is very useful for scroll compressors and refrigeration devices.

[0088] - Explanation of symbols -

[0089] 10 Scroll compressor

[0090] 11 Housing

[0091] 12 Suction pipe (first passage component)

[0092] 14 injection tube ()

[0093] 30 Compression mechanism

[0094] 31 Compression chamber

[0095] 40 static scroll

[0096] 41 Static end plate

[0097] 41a Front

[0098] 42 Static Scroll

[0099] 44 Inhalation pathway

[0100] 47 Injection channel

[0101] 50 Orbital scroll

[0102] 60 Installation

[0103] 70 Second passage component

[0104] 71 Connecting parts

[0105] 100 Refrigeration Unit

[0106] 101 Refrigerant circuit

Claims

1. A scroll compressor (10), comprising a compression mechanism (30) and a casing (11), wherein the compression mechanism (30) has a fixed scroll (40) and a movable scroll (50), wherein the fixed scroll (40) and the movable scroll (50) form a compression chamber (31), and the casing (11) accommodates the compression mechanism (30). The scroll compressor (10) is a high-pressure dome-type compressor, and ejects fluid compressed by the compression mechanism (30) into an internal space of the casing (11), characterized in that: The scroll compressor (10) comprises a first passage member (12) and a second passage member (70), wherein the first passage member (12) guides low-pressure fluid from the outside of the housing (11) to the compression mechanism (30), The second passage member (70) guides the medium-pressure fluid from the outside of the housing (11) to the compression mechanism (30). The fixed scroll (40) comprises a fixed end plate (41), a fixed scroll (42) protruding from a front surface (41a) of the fixed end plate (41), and an outer peripheral wall (43) arranged on the front surface side of the fixed end plate (41) and surrounding the fixed scroll (42). A suction passage (44) and an injection passage (47) are formed on the static end plate (41). The suction passage (44) is connected to the first passage member (12) to guide the low-pressure fluid to the compression chamber (31). The injection passage (47) is connected to the second passage member (70) to guide the medium-pressure fluid to the compression chamber (31). The static end plate (41) has a mounting portion (60), on which both the first passage member (12) and the second passage member (70) are mounted. The mounting portion (60) is a portion occupying a portion of the back side of the static end plate portion (41) and bulging on the back side of the static end plate portion (41). The fixed scroll (40) is a single component including the fixed end plate portion (41) of the mounting portion (60), the fixed scroll (42) and the outer peripheral wall portion (43) formed integrally. The low-pressure fluid after flowing into the compression mechanism (30) from the first passage component (12) and the medium-pressure fluid after flowing into the compression mechanism (30) from the second passage component (70) come into contact with the mounting portion (60), and the mounting portion (60) is cooled by the medium-pressure fluid supplied from the second passage component (70) to the compression mechanism (30).

2. The scroll compressor (10) according to claim 1, characterized in that: The injection passage (47) penetrates the static end plate portion (41) along the thickness direction of the static end plate portion (41). The second passage member (70) comprises an injection pipe (14) and a connecting member (71). The injection pipe (14) penetrates the housing (11) and is provided at a position offset from the axial direction of the injection passage (47). The connecting component (71) is mounted on the mounting portion (60) and connects the injection pipe (14) and the injection passage (47).

3. A refrigeration device, characterized in that: It comprises a refrigerant circuit (101) to which the scroll compressor (10) according to claim 1 or 2 is connected, and a refrigerant circulates in the refrigerant circuit (101) to perform a refrigeration cycle.

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