JP6197679B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor.

  Patent Document 1 discloses a conventional scroll compressor (hereinafter simply referred to as a compressor). This compressor includes a fixed scroll and a movable scroll. The fixed scroll has a fixed substrate and a fixed spiral wall protruding in a spiral shape from the fixed substrate. The movable scroll has a movable substrate and a movable spiral wall projecting in a spiral shape from the movable substrate. A compression chamber is formed between the movable scroll and the fixed scroll. When the movable scroll revolves with respect to the fixed scroll, the refrigerant in the compression chamber is compressed.

  A discharge port and two injection ports are provided through the fixed substrate. The discharge port discharges the refrigerant compressed in the compression chamber. Each injection port introduces a refrigerant having an intermediate pressure higher than the suction pressure of the sucked refrigerant and lower than the discharge pressure of the discharged refrigerant from the external refrigerant circuit into the compression chamber in the middle of compression. Each injection port is a long hole that can be closed by a movable spiral wall. For this reason, if the intermediate pressure refrigerant is introduced into the compression chamber through each injection port, the efficiency of the refrigeration circuit using the compressor is improved.

JP 2002-13491 A

  However, in the above-described conventional compressor, since the compression chamber side of the injection port is limited by the thickness of the movable spiral wall, the entire injection port is formed into a long hole, and the intermediate pressure refrigerant is sufficiently contained in the compression chamber. It is hard to be introduced. For this reason, in the refrigeration circuit using this compressor, it is difficult to further improve the efficiency.

  This invention is made | formed in view of the said conventional situation, Comprising: It is set as the problem which should be solved to provide the compressor which can improve the efficiency of a refrigerating circuit reliably.

The scroll compressor according to the present invention includes a fixed scroll having a fixed substrate and a fixed spiral wall protruding in a spiral shape from the fixed substrate;
A movable substrate, and a movable scroll having a movable spiral wall protruding in a spiral shape from the movable substrate, and a movable scroll having a compression chamber formed between the fixed scroll and the movable scroll,
When the movable scroll revolves with respect to the fixed scroll, the refrigerant in the compression chamber is compressed,
The discharge port for discharging the refrigerant compressed in the compression chamber, and the compression of the intermediate pressure higher than the suction pressure of the sucked refrigerant and lower than the discharge pressure of the discharged refrigerant from the external refrigerant circuit during the compression In the scroll type compressor in which the injection port to be introduced into the chamber is provided through the fixed substrate,
The injection port includes an elongated hole-shaped opening formed on the surface of the fixed substrate on the compression chamber side, and a round hole-shaped opening formed on the surface of the fixed substrate opposite to the compression chamber side. A communication passage communicating the elongated hole-shaped opening and the round hole-shaped opening;
The elongated hole-shaped opening can be closed by the movable spiral wall,
The opening of the round hole shape is much larger opening area than the opening of the long hole shape,
The long hole-shaped opening has a length in the longitudinal direction larger than a radial length of the round hole-shaped opening .

  In the compressor of the present invention, the opening formed on the surface of the injection port on the compression chamber side is limited by the thickness of the movable spiral wall, and thus has an elongated hole shape. However, the opening formed on the surface opposite to the compression chamber side of the injection port is not limited by the thickness of the movable spiral wall, and is not limited to the shape of the long hole. For this reason, if the opening of the injection port on the side opposite to the compression chamber side is made into a round hole shape, and the opening area of the round hole shape opening is made larger than the opening area of the oblong hole shape opening, it is conventional. A large amount of intermediate pressure refrigerant can be introduced into the injection port on the side opposite to the compression chamber side. The intermediate-pressure refrigerant thus introduced into the round hole-shaped opening is introduced into the compression chamber from the long hole-shaped opening through the communication passage. In this way, a larger amount of intermediate pressure refrigerant than in the past can be introduced into the compression chamber. In addition, a round hole is a hole formed circularly seeing from the axis | shaft which passes through the center. Moreover, the long hole is a hole obtained by moving an axis passing through the center of a round hole in parallel.

  Therefore, in this compressor, the efficiency of the refrigeration circuit can be reliably improved.

  The communication passage extends from the round hole-shaped opening in the thickness direction of the fixed substrate, and has a first communication passage having a passage cross section matched to the round hole-shaped opening, and the elongated hole-shaped opening from the thickness direction of the fixed substrate. And a second communication passage having a passage cross section adapted to the elongated hole-shaped opening. The length of the first communication path in the thickness direction of the fixed substrate is preferably longer than the length of the second communication path in the thickness direction of the fixed substrate.

  In this case, since the intermediate pressure refrigerant in the first communication passage is larger than the intermediate pressure refrigerant in the second communication passage, the amount of the intermediate pressure refrigerant introduced into the compression chamber is surely increased.

  The round hole can be formed by moving a rotating end mill or drill in the axial direction. The long hole can be formed by moving a rotating end mill or drill in the axial direction and in a direction perpendicular to the axis. Therefore, the first communication passage can be formed by using an end mill or drill having a large outer diameter and moving the rotating end mill or drill in the axial direction from the surface opposite to the compression chamber side of the fixed substrate. It is. The second communication passage uses an end mill or drill with a short outer diameter, and moves the rotating end mill or drill in the axial direction from the surface on the compression chamber side of the fixed substrate and in a direction perpendicular to the axis. Thus, it can be formed. For this reason, if the length of the first communication passage is longer than the length of the second communication passage, the time for forming the round hole in the processing time of the injection port is shorter than the time for forming the long hole. . For this reason, compared with the case where the 2nd communicating path is longer than the 1st communicating path, processing time is short and manufacturing cost can be held down.

  It is preferable that the communication path further includes a connection path that connects the first communication path and the second communication path. The connection passage is preferably reduced in diameter as it goes from the first communication passage side to the second communication passage side.

  In this case, the flow resistance of the intermediate-pressure refrigerant introduced from the first communication passage to the second communication passage is reduced in the connection passage, and the intermediate-pressure refrigerant is more easily introduced into the compression chamber.

  An intermediate pressure housing can be fixed to the surface of the fixed scroll opposite to the compression chamber side. The intermediate pressure housing is formed with an intermediate pressure port through which an intermediate pressure refrigerant is introduced from an external refrigerant circuit, a discharge chamber communicated with the discharge port, and an injection chamber communicated with the round hole-shaped opening. It is preferable. In this case, it is easy to supply the intermediate pressure refrigerant from the surface of the fixed scroll opposite to the compression chamber side.

  In the compressor of the present invention, the efficiency of the refrigeration circuit can be reliably improved.

It is sectional drawing of the compressor of Example 1. FIG. It is a block diagram of the heating refrigeration circuit using the compressor of Example 1. It is a block diagram of the heating refrigeration circuit using the compressor of Example 1. FIG. 3 is a plan view of a fixed scroll according to the compressor of the first embodiment. FIG. 3 is an enlarged cross-sectional view of an injection port according to the compressor of Embodiment 1. FIG. 4 is an enlarged plan view of an injection port according to the compressor of the first embodiment. FIG. 6 is an enlarged plan view of an injection port according to the compressor of the second embodiment. It is an enlarged plan view of an injection port according to the compressor of the reference example .

Embodiments 1 and 2 embodying the present invention will be described below with reference to the drawings.

Example 1
As shown in FIG. 1, the compressor according to the first embodiment includes a housing 10. The housing 10 includes a bottomed cylindrical front housing 11 whose rear end side is open, an intermediate pressure housing 12, and a rear housing 13 that forms a lid and closes the rear end side of the intermediate pressure housing 12. The intermediate pressure housing 12 is provided between the front housing 11 and the rear housing 13. In FIG. 1, the right side indicates the front and the left side indicates the rear.

  The rear end of the front housing 11 and the front end of the intermediate pressure housing 12 are abutted with each other. Further, the rear end of the intermediate pressure housing 12 and the front end of the rear housing 13 are abutted against each other. The front housing 11, the intermediate pressure housing 12 and the rear housing 13 are fixed to each other by a plurality of bolts 17.

  A fixed block 15 and a fixed scroll 16 are provided in the front housing 11. A fixed scroll 16 is provided behind the fixed block 15. An annular first plate 60 is interposed between the fixed block 15 and the fixed scroll 16. The fixed block 15, the first plate 60, and the fixed scroll 16 are fixed while being in contact with each other between the front housing 11 and the intermediate pressure housing 12.

  The fixed scroll 16 is integrated with the fixed substrate 16a and the fixed substrate 16a. The fixed scroll 16 is integrated with the spiral fixed spiral wall 16b protruding from the fixed substrate 16a in the axial direction and the fixed substrate 16a. The outer peripheral wall 16c covers the wall 16b from the periphery.

  A movable scroll 22 is engaged with the fixed scroll 16 between the fixed scroll 16 and the fixed block 15. The movable scroll 22 includes a disc-shaped movable substrate 22a facing the fixed substrate 16a, and a spiral movable movable wall 22b that is integral with the movable substrate 22a and protrudes rearward in the axial direction from the movable substrate 22a. Become.

  At the center of the inner surface of the front wall of the front housing 11, a cylindrical boss 11a projects rearward. A bearing device 26 is provided on the boss 11a. On the other hand, a shaft hole 15 a is formed through the center of the fixed block 15. A bearing device 25 is provided in the shaft hole 15a. A drive shaft 24 extending in the axial direction is supported rotatably on the bearing devices 25 and 26. Further, a sealing material 30 for sealing is interposed between the fixed block 15 and the drive shaft 24 by a circlip 31.

  On the rear surface of the fixed block 15, a plurality of rotation prevention pins 14 c are provided so as to protrude rearward. A plurality of rotation prevention holes 14a are formed in the movable substrate 22a of the movable scroll 22, and a rotation prevention ring 14b is fixed to each rotation prevention hole 14a. Each rotation prevention pin 14c rolls in the rotation prevention ring 14b. The anti-rotation mechanism 14 is constituted by all the anti-rotation rings 14b and the anti-rotation pins 14c.

  At the center of the front surface of the movable substrate 22a, a cylindrical boss 22c protrudes forward in the axial direction. A cylindrical eccentric pin 32 is formed at the rear end of the drive shaft 24 so as to protrude rearward in the axial direction. The eccentric pin 32 is provided with a bush 33 with a balancer. A bearing device 34 is provided between the cylindrical portion of the bush 33 with balancer and the boss 22 c of the movable scroll 22.

  Further, a suction chamber 42 for storing a low-pressure refrigerant is formed in the front housing 11 in front of the fixed block 15. A stator 44 is fixed to the inner peripheral surface of the front housing 11 in the suction chamber 42. A rotor 45 fixed to the drive shaft 24 is provided inside the stator 44. The rotor 45, the stator 44, and the drive shaft 24 constitute a motor mechanism 40.

  A suction port 43 that guides the refrigerant in the suction chamber 42 to an outer compression chamber C1 and an inner compression chamber C2 to be described later is formed on the rear end side of the inner peripheral surface of the front housing 11. Further, a suction port 46 through which the outside communicates with the suction chamber 42 is provided through the front end side of the outer peripheral wall of the front housing 11.

  A discharge port 49 is provided in the center of the fixed substrate 16 a in the fixed scroll 16 in the axial direction. A first discharge chamber 47 that stores a high-pressure refrigerant is formed between the fixed scroll 16 and the intermediate pressure housing 12. The discharge port 49 communicates with the first discharge chamber 47. A discharge reed valve 55 that can open and close the discharge port 49 and a first retainer 56 that regulates the opening degree of the discharge reed valve 55 are fixed to the fixed substrate 16 a in the first discharge chamber 47 by bolts 57. . An O-ring 48 is provided between the rear surface of the fixed substrate 16 a and the intermediate pressure housing 12.

  The fixed board 16a is provided with an outer injection port 61 and an inner injection port 62 extending in the axial direction. As shown in FIG. 4, the outer injection port 61 communicates with the outer compression chamber C1, and the inner injection port 62 communicates with the inner compression chamber C2.

  As shown in FIG. 1, an injection chamber 51 is formed in the intermediate pressure housing 12 behind the first discharge chamber 47. The injection chamber 51 is divided into a first injection chamber 51a and a second injection chamber 51b. A second plate 52 is fixed by a bolt 54 between the first injection chamber 51a and the second injection chamber 51b.

  A supply port 52 a is provided in the approximate center of the second plate 52. An injection reed valve 65 that can open and close the supply port 52a and a second retainer 58 that regulates the opening degree of the injection reed valve 65 are fixed to the second plate 52 in the first injection chamber 51a by bolts 66. Yes.

  The first injection chamber 51 a communicates with the outer injection port 61 through the outer connecting port 63 and communicates with the inner injection port 62 through the inner connecting port 64. The outer injection port 61, the inner injection port 62, the outer connection port 63, and the inner connection port 64 are formed by an end mill, as will be described later. The intermediate pressure housing 12 is provided with an intermediate pressure port 53 through which the first injection chamber 51a communicates with an external refrigeration circuit described later.

  The rear housing 13 is formed with a second discharge chamber 67 communicating with the first discharge chamber 47 and an oil separation chamber 68 having an upper end opened. The second discharge chamber 67 and the oil separation chamber 68 communicate with each other through a communication path 69. A third plate 70 that shields the second discharge chamber 67 and the first injection chamber 51 a is fixed to the intermediate pressure housing 12 by bolts 71. A separator 72 is provided in the oil separation chamber 68 so as to be orthogonal to the communication path 69. An O-ring 50 is provided between the rear surface of the intermediate pressure housing 12 and the rear housing 13.

  As shown in FIGS. 2 and 3, a pipe 73 is connected to the suction port 46, and a pipe 74 is connected to the oil separation chamber 68. The piping 73 is connected to the first inlet 75 a of the switching valve 75, and the piping 74 is connected to the second inlet 75 b of the switching valve 75. The switching valve 75 has a first outlet 75c and a second outlet 75d, a pipe 76 is connected to the first outlet 75c, and a pipe 77 is connected to the second outlet 75d.

  The pipe 76 is provided with a first heat exchanger 81, an expansion valve 82 and a receiver 83. The first heat exchanger 81 can exchange heat with air outside the vehicle. A pipe 78 is connected to the bottom of the receiver 83, and an expansion valve 86 and a second heat exchanger 84 are provided between the pipe 78 and the pipe 77. The second heat exchanger 84 can exchange heat with the air in the vehicle by the blower 85. A pipe 79 is connected to the upper part of the receiver 83. The pipe 79 is connected to the intermediate pressure port 53.

  These piping 73, 74, 76, 77, 78, 79, the switching valve 75, the compressor, the first heat exchanger 81, the expansion valve 82, the receiver 83, the expansion valve 86, and the second heat exchanger 84 circulate the refrigerant. A heating refrigeration circuit is configured. This heating / refrigeration circuit is employed as an air conditioner for vehicles.

  In this air conditioner, the motor mechanism 40 of the compressor shown in FIG. 1 rotates the rotor 45 when the driver of the vehicle performs an operation. Thereby, the drive shaft 24 is rotationally driven, and the movable scroll 22 revolves around the drive shaft 24 in cooperation with the eccentric pin 32, the balancer-equipped bush 33, the bearing device 34, and the rotation prevention mechanism 14. For this reason, as shown in FIG. 4, the volume of the outer compression chamber C1, the inner compression chamber C2, and the compression chamber C is gradually reduced.

  During these, as shown in FIG. 2, if the switching valve 75 communicates the second inlet 75b and the first outlet 75c, and communicates the first inlet 75a and the second outlet 75d, The second heat exchanger 84 functions as an evaporator, and the vehicle interior is cooled. The first heat exchanger 81 functions as a condenser and releases the heat of the refrigerant outside the vehicle.

  On the other hand, as shown in FIG. 3, if the switching valve 75 communicates the first inlet 75a and the first outlet 75c and communicates the second inlet 75b and the second outlet 75d, the second The heat exchanger 84 functions as a condenser, and the vehicle interior is heated. In addition, the 1st heat exchanger 81 functions as an evaporator, and discharge | releases the cold heat of a refrigerant | coolant outside a vehicle.

  As shown in FIG. 4, the fixed scroll 16 and the movable scroll 22 form a compression chamber C. When the movable scroll 22 revolves around the drive axis O with respect to the fixed scroll 16, the compression chamber C reduces the volume. The compression chamber C includes an outer compression chamber C1 formed outside the fixed spiral wall 16b and an inner compression chamber C2 formed inside the fixed spiral wall 16b.

  Then, as the revolution of the movable scroll 22 proceeds, the outer compression chamber C1 and the inner compression chamber C2 compress the internal refrigerant while reducing the volume. The compressed refrigerant is discharged to a discharge port 49 communicating with the compression chamber C.

  As shown in FIGS. 5 and 6, the outer injection port 61 includes one second communication passage 61b provided on the compression chamber C side and two first communication passages provided on the opposite side to the compression chamber C side. There are passages 61d and 61e, and two connection passages 61f that connect the second communication passage 61b and the first communication passages 61d and 61e.

  In the first communication passages 61d and 61e, two round hole-shaped openings 61g and 61h are formed on the surface of the fixed substrate 16a opposite to the compression chamber C side. The first communication passages 61d and 61e form passage cross sections that match the round hole-shaped openings 61g and 61h. The total area of the two round hole-shaped openings 61g and 61h is larger than the area of the elongated hole-shaped opening 61a.

  Further, in the second communication passage 61b, a single long hole-shaped opening 61a is formed on the surface of the fixed substrate 16a on the compression chamber C side. The elongated hole-shaped opening 61a can be closed by the movable spiral wall 22b. The second communication passage 61b forms a passage section that matches the elongated hole-shaped opening 61a.

  Each length L1 in the thickness direction of the fixed substrate 16a in the first communication passages 61d and 61e is longer than the length L2 in the thickness direction of the fixed substrate 16a in the second communication passage 61b. The connection passages 61f that connect the first communication passages 61d and 61e and the second communication passage 61b are reduced in diameter from the first communication passages 61d and 61e toward the second communication passage 61b.

  The first communication passages 61d and 61e are formed by using an end mill or drill having a large outer diameter and moving the rotating end mill or the like in the axial direction from the surface opposite to the compression chamber C side of the fixed substrate 16a. Is possible. The second communication passage 61b uses an end mill or drill with a short outer diameter, moves a rotating end mill or the like in the axial direction from the surface of the fixed substrate 16a on the compression chamber C side, and is slightly curved in a direction perpendicular to the axis. It can be formed by moving while moving. The connection passage 61f can be formed by the shape of the tip surface of an end mill with a large outer diameter used to form the first communication passages 61d and 61e. That is, the connection passage 61f is formed when the first communication passages 61d, 61e and the second communication passage 61b are communicated with each other by an end mill having a large outer diameter.

Inner injection port 62 is also similar to the outer injection port 61, closed second communication passage 62 b, the first communication passage 62 d, 62e, round hole shape of the opening 62 g, 62h, a long hole shape of the opening 62a, the connecting passage 62f doing.

  In this compressor, the opening formed in the surface on the compression chamber C side of the injection port is restricted by the thickness t of the movable spiral wall 22b, and thus has an elongated hole shape. However, the opening formed on the surface opposite to the compression chamber C side of the injection port is not limited by the thickness t of the movable spiral wall 22b, and is not limited to the shape of the long hole. For this reason, the opening of the injection port on the side opposite to the compression chamber C side can be formed into a round hole shape. If the opening area of the round hole-shaped openings 61g, 61h, 62g, 62h of the outer injection port 61 and the inner injection port 62 is made larger than the opening areas of the elongated hole-shaped openings 61a, 62a, a larger amount than the conventional one. The intermediate pressure refrigerant can be introduced into the outer injection port 61 and the inner injection port 62 opposite to the compression chamber side. The intermediate pressure refrigerant introduced into the round hole-shaped openings 61g, 61h, 62g, and 62h passes through the first communication passages 61d, 61e, 62d, and 62e and the second communication passages 61b and 62b, and has an elongated hole-shaped opening 61a. 62a is introduced into the compression chamber C. In this way, a larger amount of intermediate pressure refrigerant than before can be introduced into the compression chamber C.

  Particularly, the diameter of the connection passage 62f is reduced from the first communication passages 61d, 61e, 62d, 62e toward the second communication passages 61b, 62b. For this reason, the flow resistance of the intermediate pressure refrigerant introduced from the first communication passages 61d, 61e, 62d, 62e to the second communication passages 61b, 62b is reduced by the connection passages 61f, 62f, and the intermediate pressure refrigerant is further reduced. Easy to be introduced into the compression chamber C.

  Further, in this compressor, each length L1 of the first communication passages 61d, 61e, 62d, 62e is longer than each length L2 of the second communication passages 61b, 62b. For this reason, since the intermediate pressure refrigerant in the first communication passages 61d, 61e, 62d, 62e is larger than the intermediate pressure refrigerant in the second communication passages 61a, 62a, the intermediate pressure introduced into the compression chamber C is increased. The amount of refrigerant increases.

  Therefore, in this compressor, the efficiency of the refrigeration circuit can be reliably improved.

  In this compressor, among the processing times of the outer injection port 61 and the inner injection port 62, the time during which the first communication passages 61d, 61e, 62d, 62e are formed forms the second communication passages 61b, 62b. The time is shorter. For this reason, in this compressor, manufacturing cost can be held down.

(Example 2)
As shown in FIG. 7, in the compressor according to the second embodiment, the outer injection port 161 includes one first communication passage 161d and one second communication passage 161b. The opening area of the round hole-shaped opening 161g is larger than the opening area of the long hole-shaped opening 161a. The inner injection port 162 is the same as the outer injection port 161. Other configurations are the same as those of the first embodiment.

  In this case, the first communication passage 161d of the outer injection port 161 and the inner injection port 162 can be formed at a time using an end mill having a larger outer diameter than the end mill used in the first embodiment. For this reason, compared with the compressor of Example 1, processing time becomes shorter and manufacturing cost can be suppressed more. Other functions and effects are the same as those of the first embodiment.

( Reference example )
As shown in FIG. 8, in the compressor of the reference example , the outer injection port 261 is configured by a second communication passage 261b and a first communication passage 261d having a larger diameter. The opening area of the round hole-shaped opening 261g is larger than the opening area of the long hole-shaped opening 261a. The inner injection port 262 is similar to the outer injection port 261. Other configurations are the same as those of the first embodiment.

  In this case, the intermediate pressure refrigerant introduced into the first communication passage 261d is larger than the intermediate pressure refrigerant introduced into the first communication passages 61d, 61e, 62d, and 62e of the first embodiment. The amount of intermediate pressure refrigerant introduced into the chamber C further increases. Other functions and effects are the same as those of the first embodiment.

Although the invention has been described with reference to Examples 1 and 2, the present invention is not limited to the above Examples 1 and 2, it may be modified as appropriate without departing from its spirit is Needless to say.

  For example, in the compressor of the present invention, the outer injection port, the inner injection port, the outer connection port, and the inner connection port are formed by an end mill, but these can also be formed by casting.

  Further, the outer injection port and the inner injection port may be formed without using the intermediate pressure housing 12. One of the outer injection port and the inner injection port may be shifted along the fixed spiral wall. The length of the long hole can be appropriately selected.

  Furthermore, the compressor of the present invention is also applicable when the number of turns is not equal between the fixed scroll wall of the fixed scroll and the movable scroll wall of the movable scroll.

  The present invention is applicable to a refrigeration circuit, a heating circuit, a heating refrigeration circuit, and the like.

DESCRIPTION OF SYMBOLS 12 ... Intermediate pressure housing 16 ... Fixed scroll 16a ... Fixed substrate 16b ... Fixed spiral wall 22 ... Movable scroll 22a ... Movable substrate 22b ... Movable spiral wall 47 ... First discharge chamber (discharge chamber)
49 ... Discharge port 51 ... Injection chamber 51a ... First injection chamber 51b ... Second injection chamber 53 ... Intermediate pressure ports 61, 161, 261 ... Outer injection ports (injection ports)
62, 162, 262 ... Inner injection port (injection port)
61a, 62a, 161a, 261a ... Elongated opening 61b, 62b, 161b, 261b ... Second communication passage 61g, 61h, 62g, 62h, 161g, 261g ... Round hole shaped openings 61d, 61e, 62d, 62e, 161d, 261d ... 1st communication passage 61f, 62f ... Connection passage 67 ... 2nd discharge chamber (discharge chamber)
Compression chamber ... C

Claims (4)

A fixed scroll having a fixed substrate and a fixed spiral wall protruding in a spiral shape from the fixed substrate;
A movable substrate, and a movable scroll having a movable spiral wall protruding in a spiral shape from the movable substrate, and a movable scroll having a compression chamber formed between the fixed scroll and the movable scroll,
When the movable scroll revolves with respect to the fixed scroll, the refrigerant in the compression chamber is compressed,
The discharge port for discharging the refrigerant compressed in the compression chamber, and the compression of the intermediate pressure higher than the suction pressure of the sucked refrigerant and lower than the discharge pressure of the discharged refrigerant from the external refrigerant circuit during the compression In the scroll type compressor in which the injection port to be introduced into the chamber is provided through the fixed substrate,
The injection port includes an elongated hole-shaped opening formed on the surface of the fixed substrate on the compression chamber side, and a round hole-shaped opening formed on the surface of the fixed substrate opposite to the compression chamber side. A communication passage communicating the elongated hole-shaped opening and the round hole-shaped opening;
The elongated hole-shaped opening can be closed by the movable spiral wall,
The opening of the round hole shape is much larger opening area than the opening of the long hole shape,
The scroll-type compressor, wherein the long hole-shaped opening has a length in a longitudinal direction larger than a radial length in the round hole-shaped opening . The communication passage extends in the thickness direction of the fixed substrate from the round hole-shaped opening and has a first communication passage having a passage cross section matched to the round hole-shaped opening, and the elongated hole-shaped opening. A second communication passage extending in the thickness direction of the fixed substrate and having a passage cross section matched to the elongated hole-shaped opening,
2. The scroll compressor according to claim 1, wherein a length of the first communication passage in a thickness direction of the fixed substrate is longer than a length of the second communication passage in a thickness direction of the fixed substrate. The communication path further includes a connection path that connects the first communication path and the second communication path;
The scroll compressor according to claim 2, wherein the diameter of the connection passage is reduced from the first communication passage side toward the second communication passage side. An intermediate pressure housing is fixed to the surface of the fixed scroll opposite to the compression chamber side,
The intermediate pressure housing includes an intermediate pressure port through which the intermediate pressure refrigerant is introduced from the external refrigerant circuit, a discharge chamber communicated with the discharge port, and an injection chamber communicated with the round hole-shaped opening. The scroll compressor according to any one of claims 1 to 3, wherein the compressor is formed.

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