Scroll compressor and refrigeration device

Abstract

The utility model relates to a scroll compressor and a refrigerating device. The injection mechanism (50) supplies a refrigerant to each of the first injection port (41) and the second injection port (42). The injection mechanism (50) has an injection passage (53) through which the refrigerant flows, a first branch passage (51) communicating with the downstream end of the injection passage (53) and the first injection port (41), and a second branch passage (52) communicating with the downstream end of the injection passage (53) and the second injection port (42). The length of the first branch passage (51) is equal to the length of the second branch passage (52). According to the utility model, the refrigerant can be uniformly distributed to the first compression chamber (S1) and the second compression chamber (S2) which are divided by the movable side scroll (28) and the static side scroll (23).

Description

Technical Field

[0001] The utility model relates to a scroll compressor and a refrigeration device. Background Art

[0002] A scroll compressor is disclosed in Patent Document 1, in which two refrigerant injection holes are provided on a stationary scroll plate, and the two refrigerant injection holes are respectively communicated with a first compression chamber (first chamber) and a second compression chamber (second chamber). A branch pipe is connected to the two refrigerant injection holes. The branch pipe is configured to extend linearly toward the second compression chamber and branch and extend toward the first compression chamber in the middle of the pipe.

[0003] Patent Document 1: Japanese Unexamined Patent Publication No. Hei 05-180182 Summary of the Utility Model

[0004] -Technical Problems to be Solved by the Utility Model-

[0005] However, in the existing invention, the length of the refrigerant passage from the branch position of the branch pipe to the refrigerant injection hole communicated with the first compression chamber is longer than the length of the refrigerant passage from the branch position of the branch pipe to the refrigerant injection hole communicated with the second compression chamber.

[0006] Here, due to the difference in the length of the refrigerant passage, the passage resistance of the refrigerant passage is different, so there is a problem that the refrigerant cannot be evenly distributed to the first compression chamber and the second compression chamber.

[0007] The purpose of the utility model is to be able to evenly distribute the refrigerant to the first compression chamber and the second compression chamber divided by a moving scroll and a stationary scroll.

[0008] -Technical Solutions for Solving Technical Problems-

[0009] A first aspect of the present utility model relates to a scroll compressor, which includes a stationary scroll plate and a rotating scroll plate. The stationary scroll plate has a stationary-side scroll in a spiral shape, and the rotating scroll plate has a rotating-side scroll in a spiral shape. When observed axially from the stationary scroll plate, the rotating-side scroll and the stationary-side scroll are point-symmetrical. The stationary-side scroll and the rotating-side scroll mesh to form a compression chamber, which includes a first compression chamber and a second compression chamber. The first compression chamber is demarcated by the outer side of the rotating-side scroll and the inner side of the stationary-side scroll, and the second compression chamber is demarcated by the inner side of the rotating-side scroll and the outer side of the stationary-side scroll. The stationary scroll plate has a first injection port and a second injection port. The first injection port communicates with the first compression chamber, and the second injection port communicates with the second compression chamber. The scroll compressor includes an injection mechanism, which supplies refrigerant to the first injection port and the second injection port respectively. The injection mechanism has an injection passage, a first branch passage, and a second branch passage. The injection passage allows the refrigerant to flow. The first branch passage communicates with the downstream end of the injection passage and the first injection port, and the second branch passage communicates with the downstream end of the injection passage and the second injection port. The length of the first branch passage is equal to the length of the second branch passage.

[0010] In the first aspect, by making the length of the first branch passage equal to the length of the second branch passage, the refrigerant flowing in the injection passage can be evenly distributed to the first compression chamber and the second compression chamber.

[0011] A second aspect of the present utility model is based on the scroll compressor of the first aspect. When observed axially from the stationary scroll plate, a straight line connecting the first center of the first injection port and the second center of the second injection port is set as a first imaginary line, and the perpendicular bisector of the first imaginary line is set as a second imaginary line. The downstream end of the injection passage is located on the second imaginary line.

[0012] In the second aspect, by making the downstream end of the injection passage located on the second imaginary line, the length of the first branch passage can be made equal to the length of the second branch passage.

[0013] A third aspect of the present utility model is based on the scroll compressor of the second aspect. The injection passage extends along a direction intersecting with the second imaginary line.

[0014] In the third aspect, the injection passage can be arranged in a free-layout manner so that the injection passage does not interfere with the surrounding components.

[0015] A fourth aspect of the present utility model is based on the scroll compressor of the second or third aspect. The downstream end of the injection passage is located at the intersection of the first imaginary line and the second imaginary line.

[0016] In a fourth aspect, compared with the case where the downstream end of the injection passage is located at a position deviated from the intersection point, the lengths of the first branch passage and the second branch passage can be shortened.

[0017] Based on the scroll compressor according to any one of the first to fourth aspects of the present utility model, in a fifth aspect, the injection passage extends along the radial direction of the stationary scroll plate.

[0018] In a fifth aspect, compared with the case where the injection passage extends along the axial direction, the overall height of the scroll compressor can be suppressed.

[0019] Based on the scroll compressor according to any one of the first to fifth aspects of the present utility model, in a sixth aspect, the injection mechanism has a block member fixed to the stationary scroll plate, and the block member has the first branch passage and the second branch passage.

[0020] In a sixth aspect, by forming the injection mechanism with a block member which is a component different from the stationary scroll plate, it is not necessary to form the first branch passage and the second branch passage on the stationary scroll plate side, and the processing man-hours of the stationary scroll plate can be reduced.

[0021] A seventh aspect of the present utility model relates to a refrigeration device, which includes the scroll compressor according to any one of the first to sixth aspects and a refrigerant circuit through which the refrigerant compressed by the scroll compressor flows.

[0022] In a seventh aspect, a refrigeration device including a scroll compressor and a refrigerant circuit can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a refrigerant circuit diagram showing the structure of the refrigeration device of the first embodiment;

[0024] Figure 2 is a longitudinal sectional view showing the structure of the scroll compressor;

[0025] Figure 3 is a bottom view showing the structures of the stationary scroll plate and the orbiting scroll plate;

[0026] Figure 4 is a top view showing the structure of the injection mechanism;

[0027] Figure 5 is a longitudinal sectional view showing the structure of the injection mechanism;

[0028] Figure 6 is a top view showing the structure of the injection mechanism of the second embodiment of the present invention.

[0029] -SYMBOL DESCRIPTION-

[0030] 1 - Refrigeration device; 1a - Refrigerant circuit; 10 - Scroll compressor; 21 - Stationary scroll plate; 23 - Stationary-side scroll; 26 - Movable scroll plate; 28 - Movable-side scroll; 41 - First injection port; 42 - Second injection port; 50 - Injection mechanism; 51 - First branch passage; 52 - Second branch passage; 53 - Injection passage; 60 - Block component; C1 - First center; C2 - Second center; L1 - First imaginary line; L2 - Second imaginary line; P - Intersection point; S - Compression chamber; S1 - First compression chamber; S2 - Second compression chamber. Detailed implementation mode

[0031] (First implementation mode)

[0032] As Figure 1 shown, the scroll compressor 10 is provided in the refrigeration device 1. The refrigeration device 1 has a refrigerant circuit 1a filled with a refrigerant. The refrigerant circuit 1a has a scroll compressor 10, a radiator 3, a decompression mechanism 4, an evaporator 5, an injection valve 6, and a subcooling heat exchanger 7. The decompression mechanism 4 is, for example, an expansion valve. The refrigerant circuit 1a performs a vapor compression refrigeration cycle.

[0033] The refrigeration device 1 is an air conditioner. The air conditioner can be a refrigeration-only machine, a heating-only machine, or an air conditioner that can switch between refrigeration and heating. In this case, the air conditioner has a switching mechanism (such as a four-way reversing valve) for switching the circulation direction of the refrigerant. The refrigeration device 1 can also be a water heater, a cooling unit, a cooling device for cooling the air in a warehouse, etc. The cooling device cools the air inside a cold storage, a freezer, a container, etc.

[0034] The injection valve 6 is connected to a pipe branched from the pipe between the decompression mechanism 4 and the evaporator 5. The injection valve 6 is composed of an electronically controlled expansion valve with variable opening.

[0035] The subcooling heat exchanger 7 has a first flow path 7a and a second flow path 7b. The first flow path 7a is connected to the pipe between the decompression mechanism 4 and the evaporator 5. The second flow path 7b is connected to the pipe between the injection valve 6 and the scroll compressor 10. The subcooling heat exchanger 7 exchanges heat between the refrigerant flowing in the first flow path 7a and the refrigerant flowing in the second flow path 7b.

[0036] The high-pressure refrigerant ejected from the scroll compressor 10 is sent to the radiator 3, and the low-pressure refrigerant evaporated in the evaporator 5 is sucked into the scroll compressor 10. At this time, the medium-pressure refrigerant evaporated in the second flow path 7b of the subcooling heat exchanger 7 flows into the injection pipe 55 of the scroll compressor 10.

[0037] As Figure 2 and Figure 3As shown, the scroll compressor 10 is a low-pressure vault type scroll compressor. The scroll compressor 10 includes a housing 11, a compression mechanism 20, a motor 30, a drive shaft 35, a floating member 70, and a frame 71.

[0038] The housing 11 is formed in a cylindrical shape with a relatively long longitudinal length and closed at both ends. The compression mechanism 20, the motor 30, the drive shaft 35, the floating member 70, and the frame 71 are accommodated in the housing 11. The compression mechanism 20 and the motor 30 are connected by the drive shaft 35. The drive shaft 35 extends along the axial direction of the scroll compressor 10.

[0039] A partition member 15 is provided in the upper part of the housing 11. The partition member 15 divides the internal space of the housing 11 into two spaces. The space below the partition member 15 constitutes a low-pressure space 16. The space above the partition member 15 constitutes a high-pressure space 17.

[0040] An intake pipe 12 and an ejection pipe 13 are provided on the housing 11. The intake pipe 12 penetrates the trunk portion of the housing 11 in the radial direction and communicates with the low-pressure space 16. The intake pipe 12 introduces a low-pressure fluid (for example, gaseous refrigerant) into the low-pressure space 16.

[0041] The ejection pipe 13 penetrates the upper part of the housing 11 in the radial direction and communicates with the high-pressure space 17. The ejection pipe 13 leads out the high-pressure fluid in the high-pressure space 17 to the outside of the housing 11.

[0042] The compression mechanism 20 sucks in a fluid and compresses the fluid. The compression mechanism 20 has a stationary scroll disk 21 and a moving scroll disk 26. The stationary scroll disk 21 is fixed to the frame 71. The moving scroll disk 26 is disposed between the floating member 70 and the stationary scroll disk 21.

[0043] The stationary scroll disk 21 has a stationary side end plate 22, a stationary side scroll 23, and an outer peripheral wall portion 24.

[0044] The stationary side end plate 22 is formed in an approximately circular plate shape. A discharge port 25 is formed in the central portion of the stationary side end plate 22. The discharge port 25 penetrates the stationary side end plate 22 in the thickness direction. The stationary side scroll 23 is formed in a scroll shape. The stationary side scroll 23 protrudes from the Figure 2 lower surface of the above.

[0045] The outer peripheral wall portion 24 is formed to surround the outer peripheral side of the stationary side scroll 23. The outer peripheral wall portion 24 protrudes from the Figure 2 lower surface of the above. An intake port 21a is formed on the outer peripheral wall portion 24. The intake port 21a communicates with the low-pressure space 16.

[0046] The moving scroll disk 26 has a moving side end plate 27, a moving side scroll 28, and a flange portion 29.

[0047] The moving-side end plate 27 is formed in a plate shape that is approximately circular. The moving-side scroll 28 is formed in a scroll shape that is point-symmetrical to the stationary-side scroll 23 when viewed from the axial direction of the stationary scroll plate 21. The moving-side scroll 28 protrudes from the Figure 2 upper surface in

[0048] The flange portion 29 is formed in a cylindrical shape and is disposed at the central portion of the lower surface of the moving-side end plate 27. The moving-side scroll 28 meshes with the stationary-side scroll 23 of the stationary scroll plate 21. The moving scroll plate 26 is configured to perform an eccentric rotational movement with respect to the stationary scroll plate 21. Figure 2 The stationary-side scroll 23 meshes with the moving-side scroll 28, thereby forming a compression chamber S. The compression chamber S is a space for compressing fluid. The compression chamber S is configured to compress the fluid sucked through the suction pipe 12, the low-pressure space 16, and the suction port 21a, and to discharge the compressed fluid through the discharge port 25.

[0049] The compression chamber S includes a first compression chamber S1 and a second compression chamber S2. The first compression chamber S1 is defined by the outside of the moving-side scroll 28 and the inside of the stationary-side scroll 23. The second compression chamber S2 is defined by the inside of the moving-side scroll 28 and the outside of the stationary-side scroll 23.

[0050] The stationary scroll plate 21 has a first injection port 41 and a second injection port 42. The first injection port 41 and the second injection port 42 are formed on the stationary-side end plate 22. The first injection port 41 communicates with the first compression chamber S1. The second injection port 42 communicates with the second compression chamber S2.

[0051] The electric motor 30 is disposed at a position lower than the compression mechanism 20. The electric motor 30 has a stator 31 and a rotor 32. The stator 31 is substantially formed in a cylindrical shape and is fixed to the housing 11. The rotor 32 is rotatably inserted into the inner circumference of the stator 31. The drive shaft 35 is inserted and fixed to the inner circumference of the rotor 32.

[0052] The drive shaft 35 drives the moving scroll plate 26. The drive shaft 35 is connected to the moving scroll plate 26, and the drive shaft 35 supports the moving scroll plate 26 in a rotatable manner. The drive shaft 35 has a main shaft portion 36 and an eccentric shaft portion 37.

[0053] The main shaft portion 36 extends along the axial direction of the scroll compressor 10. The eccentric shaft portion 37 is provided at the upper end of the main shaft portion 36. The outer diameter of the eccentric shaft portion 37 is smaller than the outer diameter of the main shaft portion 36. The axis of the eccentric shaft portion 37 is deviated from the axis of the main shaft portion 36 by a predetermined distance. The eccentric shaft portion 37 is connected to the flange portion 29 of the moving scroll plate 26.

[0054] The main shaft portion 36 extends along the axial direction of the scroll compressor 10. The eccentric shaft portion 37 is provided at the upper end of the main shaft portion 36. The outer diameter of the eccentric shaft portion 37 is smaller than the outer diameter of the main shaft portion 36. The axis of the eccentric shaft portion 37 is deviated from the axis of the main shaft portion 36 by a predetermined distance. The eccentric shaft portion 37 is connected to the flange portion 29 of the moving scroll plate 26.

[0055] The floating member 70 presses the orbiting scroll 26 against the fixed scroll 21. The floating member 70 is substantially formed in a cylindrical shape. The floating member 70 supports the drive shaft 35 in a rotatable manner.

[0056] A crosshead coupling 80 is disposed between the orbiting scroll 26 and the floating member 70. The crosshead coupling 80 functions as an anti-rotation mechanism for the orbiting scroll 26.

[0057] The frame 71 supports the floating member 70. The frame 71 is substantially formed in a cylindrical shape. The frame 71 is fixed to the housing 11 in the low-pressure space 16, for example, by press-fitting.

[0058] 〈Injection mechanism〉

[0059] An injection mechanism 50 is disposed above the fixed scroll 21. The injection mechanism 50 supplies refrigerant to the first injection port 41 and the second injection port 42, respectively.

[0060] Specifically, as Figure 4 and Figure 5 shown, the injection mechanism 50 includes a block member 60. The block member 60 is fixed to the fixed scroll 21. The block member 60 has a first branch passage 51, a second branch passage 52, and an injection passage 53 through which refrigerant flows.

[0061] The block member 60 has an inlet block 61 and a branch block 65. The inlet block 61 and the branch block 65 are formed integrally. A passage hole 62 is formed in the inlet block 61. When viewed from the axial direction of the fixed scroll 21, the passage hole 62 opens radially outward. The passage hole 62 extends along the radial direction of the fixed scroll 21 inside the inlet block 61 of the block member 60 and then extends downward. The injection pipe 55 is connected to the opening of the passage hole 62. The injection passage 53 includes the passage hole 62 and the injection pipe 55.

[0062] The first branch passage 51 and the second branch passage 52 are formed in the branch block 65. The first branch passage 51 communicates with the downstream end of the injection passage 53 and the first injection port 41. Specifically, the first branch passage 51 extends from the downstream end of the injection passage 53 to the Figure 5 left side in the branch block 65 of the block member 60 and then extends downward, thereby communicating with the first injection port 41.

[0063] The second branch passage 52 communicates with the downstream end of the injection passage 53 and the second injection port 42. Specifically, the second branch passage 52 extends from the downstream end of the injection passage 53 to the Figure 5 right side in the branch block 65 of the block member 60 and then extends downward, thereby communicating with the second injection port 42.

[0064] However, when the length of the first branch passage 51 is different from the length of the second branch passage 52, the flow path resistances of the first branch passage 51 and the second branch passage 52 are different. Therefore, it may not be possible to evenly distribute the refrigerant flowing in the injection passage 53 to the first compression chamber S1 and the second compression chamber S2.

[0065] In this case, since the pressures in the first compression chamber S1 and the second compression chamber S2 are different, the acting points of the thrust bearing loads and the tipping moments of the orbiting scroll 26 and the floating member 70 change. Due to the change in the acting point, the local surface pressure of the thrust bearing increases and the tipping moment decreases, and the clearance of the sliding surface between the orbiting scroll 26 and the floating member 70 becomes smaller accordingly. As a result, it may not be possible to form an oil film in this clearance, resulting in uneven wear.

[0066] Therefore, in the present embodiment, the lengths of the first branch passage 51 and the second branch passage 52 are set so that the length of the first branch passage 51 is equal to the length of the second branch passage 52.

[0067] Specifically, as Figure 4 shown, when viewed axially of the stationary scroll 21, a straight line connecting the first center C1 of the first injection port 41 and the second center C2 of the second injection port 42 is defined as a first imaginary line L1, and a perpendicular bisector of the first imaginary line L1 is defined as a second imaginary line L2. Also, the arrangement of the injection passage 53 is set such that the downstream end of the injection passage 53 is located on the second imaginary line L2. In the Figure 4 example shown, the downstream end of the injection passage 53 is located at the intersection point P of the first imaginary line L1 and the second imaginary line L2. The injection passage 53 extends along a direction intersecting the second imaginary line L2.

[0068] In this way, by positioning the downstream end of the injection passage 53 on the second imaginary line L2, the length of the first branch passage 51 can be made equal to the length of the second branch passage 52.

[0069] 〈Operation〉

[0070] The operation of the scroll compressor 10 will be described.

[0071] As Figure 2 shown, when power is supplied to the electric motor 30, the rotor 32 of the electric motor 30 rotates, and the drive shaft 35 is driven to rotate. The drive shaft 35 is driven to rotate, causing the orbiting scroll 26 connected to the drive shaft 35 to perform an eccentric rotational movement relative to the stationary scroll 21. As a result, the low-pressure fluid is sucked into the compression chamber S via the suction pipe 12 and the low-pressure space 16, and is compressed in the compression chamber S. The compressed fluid is ejected from the ejection pipe 13 via the ejection port 25 and the high-pressure space 17.

[0072] Medium-pressure refrigerant is introduced into the first compression chamber S1 and the second compression chamber S2 in the compression process from the first injection port 41 and the second injection port 42. Thus, the supply amount of the refrigerant supplied to the first compression chamber S1 and the second compression chamber S2 can be adjusted according to the required capacity of the scroll compressor 10.

[0073] - Effects of the First Embodiment-

[0074] According to the characteristics of this embodiment, by making the length of the first branch passage 51 equal to the length of the second branch passage 52, the refrigerant flowing in the injection passage 53 can be evenly distributed to the first compression chamber S1 and the second compression chamber S2.

[0075] According to the characteristics of this embodiment, by making the downstream end of the injection passage 53 located on the second imaginary line L2, the length of the first branch passage 51 can be made equal to the length of the second branch passage 52.

[0076] According to the characteristics of this embodiment, by making the injection passage 53 extend along a direction intersecting the second imaginary line L2, the injection passage 53 can be arranged in a free layout manner so that the injection passage 53 does not interfere with the surrounding components.

[0077] According to the characteristics of this embodiment, compared with the case where the downstream end of the injection passage 53 is located at a position deviated from the intersection point P, by making the downstream end of the injection passage 53 located at the intersection point P of the first imaginary line L1 and the second imaginary line L2, the lengths of the first branch passage 51 and the second branch passage 52 can be shortened.

[0078] According to the characteristics of this embodiment, compared with the case where the injection passage 53 extends along the axial direction, by making the injection passage 53 extend along the radial direction of the stationary scroll plate 21, the overall height of the scroll compressor can be suppressed.

[0079] According to the characteristics of this embodiment, by forming the injection mechanism 50 with a block member 60, which is a component different from the stationary scroll plate 21, it is not necessary to form the first branch passage 51 and the second branch passage 52 on the stationary scroll plate 21 side, and the processing man-hours of the stationary scroll plate 21 can be reduced.

[0080] According to the characteristics of this embodiment, a refrigeration device including a scroll compressor 10 and a refrigerant circuit 1a can be provided.

[0081] (Second Embodiment)

[0082] Hereinafter, the same parts as those in the above embodiment are denoted by the same reference numerals, and only the different parts will be described.

[0083] As Figure 6As shown, the injection mechanism 50 has a block member 60. The block member 60 is fixed to the stationary scroll 21. The block member 60 has a first branch passage 51, a second branch passage 52, and an injection passage 53 through which the refrigerant flows.

[0084] The block member 60 has an inlet block 61 and a branch block 65. The inlet block 61 and the branch block 65 are formed integrally. A passage hole 62 is formed in the inlet block 61. When viewed from the axial direction of the stationary scroll 21, the passage hole 62 opens to the radially outer side. The passage hole 62 extends along the radial direction of the stationary scroll 21 inside the inlet block 61 of the block member 60 and then extends downward. The injection pipe 55 is connected to the opening of the passage hole 62. The injection passage 53 includes the passage hole 62 and the injection pipe 55.

[0085] The branch block 65 includes a first branch block 66 and a second branch block 67. The first branch block 66 extends between the inlet block 61 and the first injection port 41. The first branch passage 51 extends inside the first branch block 66 of the block member 60 from the downstream end of the injection passage 53 toward the first injection port 41. Thus, the first branch passage 51 communicates with the downstream end of the injection passage 53 and the first injection port 41.

[0086] The second branch block 67 extends between the inlet block 61 and the second injection port 42. The second branch passage 52 extends inside the second branch block 67 of the block member 60 from the downstream end of the injection passage 53 toward the second injection port 42. Thus, the second branch passage 52 communicates with the downstream end of the injection passage 53 and the second injection port 42.

[0087] In Figure 6 In the example shown, the downstream end of the injection passage 53 is arranged on the second imaginary line L2 and at a position deviated from the intersection point P of the first imaginary line L1 and the second imaginary line L2. The injection passage 53 extends along a direction intersecting with the second imaginary line L2.

[0088] In this way, by making the downstream end of the injection passage 53 located on the second imaginary line L2, the lengths of the first branch passage 51 and the second branch passage 52 can be made equal.

[0089] (Other embodiments)

[0090] The above-described embodiment may also adopt the following structure.

[0091] In this embodiment, the structure in which the injection mechanism 50 has a block member 60 and the first branch passage 51 and the second branch passage 52 are formed inside the block member 60 has been described, but it is not limited to this method. For example, the first branch passage 51 and the second branch passage 52 may be formed of pipes having the same length, and these pipes may be connected to the injection pipe 55.

[0092] The above has described the embodiments. However, it should be understood that various changes can be made to the embodiments and specific circumstances without departing from the gist and scope of the claims. It is also possible to make appropriate combinations or substitutions of the elements involved in the above embodiments, variations, and other embodiments. The words "first", "second", "third",... in the description and claims are used to distinguish the statements containing these words, and do not limit the quantity or order of such statements.

[0093] -Industrial Applicability-

[0094] In summary, the present utility model is useful for scroll compressors.

Claims

1. A scroll compressor, which includes a stationary scroll disk (21) and a rotating scroll disk (26). The stationary scroll disk (21) has a stationary-side scroll (23) in a scroll shape, and the rotating scroll disk (26) has a rotating-side scroll (28) in a scroll shape. When viewed axially from the stationary scroll disk (21), the rotating-side scroll (28) is point-symmetrical with the stationary-side scroll (23). The stationary-side scroll (23) and the rotating-side scroll (28) engage with each other to form a compression chamber (S), and it is characterized in that: The compression chamber (S) includes a first compression chamber (S1) and a second compression chamber (S2). The first compression chamber (S1) is defined by the outer side of the rotating-side scroll (28) and the inner side of the stationary-side scroll (23), and the second compression chamber (S2) is defined by the inner side of the rotating-side scroll (28) and the outer side of the stationary-side scroll (23). The stationary scroll disk (21) has a first injection port (41) and a second injection port (42). The first injection port (41) communicates with the first compression chamber (S1), and the second injection port (42) communicates with the second compression chamber (S2). The scroll compressor includes an injection mechanism (50), and the injection mechanism (50) supplies refrigerant to the first injection port (41) and the second injection port (42) respectively. The injection mechanism (50) has an injection passage (53), a first branch passage (51), and a second branch passage (52). The injection passage (53) allows the refrigerant to flow through. The first branch passage (51) communicates with the downstream end of the injection passage (53) and the first injection port (41). The second branch passage (52) communicates with the downstream end of the injection passage (53) and the second injection port (42). The length of the first branch passage (51) is equal to the length of the second branch passage (52).

2. The scroll compressor according to claim 1, characterized in that: When viewed axially from the stationary scroll disk (21), a straight line connecting a first center (C1) of the first injection port (41) and a second center (C2) of the second injection port (42) is set as a first imaginary line (L1), and a perpendicular bisector of the first imaginary line (L1) is set as a second imaginary line (L2). The downstream end of the injection passage (53) is located on the second imaginary line (L2).

3. The scroll compressor according to claim 2, characterized in that: The injection passage (53) extends along a direction intersecting with the second imaginary line (L2).

4. The scroll compressor according to claim 2 or 3, characterized in that: The downstream end of the injection passage (53) is located at an intersection point (P) of the first imaginary line (L1) and the second imaginary line (L2).

5. The scroll compressor according to any one of claims 1 to 3, characterized in that: The injection passage (53) extends along the radial direction of the stationary scroll disk (21).

6. The scroll compressor according to any one of claims 1 to 3, characterized in that: The injection mechanism (50) has a block member (60) fixed to the stationary scroll plate (21). The block member (60) has the first branch passage (51) and the second branch passage (52).

7. A refrigeration device, characterized in that: The refrigeration device includes the scroll compressor (10) according to any one of claims 1 to 3, and a refrigerant circuit (1a) through which refrigerant that has been compressed by the scroll compressor (10) flows.

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