JP2015113817A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type compressor in which a liquid refrigerant is supplied to an intermediate pressure region by using liquid injection and nonetheless, the temperature of central parts of scrolls from which the refrigerant is discharged can be reduced.SOLUTION: A scroll type compressor 1 includes a housing 10, an orbiting scroll 30 which is provided inside the housing 10 and is freely rotatably coupled to an eccentric shaft part of a main shaft 17, and a fixed scroll 20 opposed to the orbiting scroll 30 to thereby form compression chambers PR for compressing a refrigerant. The scroll type compressor 1 cools the orbiting scroll 30 and the fixed scroll 20 by supplying the liquid refrigerant LR supplied from a refrigeration cycle 60 into the compression chambers PR via a refrigerant passage. A heat insulation material 48 is provided in a partial region of the refrigerant passage.

Description

  The present invention relates to a scroll compressor, and more particularly to a scroll compressor having a high discharge pressure.

  A scroll compressor used in a refrigeration cycle such as a refrigeration apparatus or an air conditioner includes a fixed scroll and a turning scroll. The fixed scroll and the orbiting scroll (hereinafter, both scrolls are simply referred to as a scroll) are each formed by integrally forming a spiral wrap on one surface side of a disk-shaped end plate. The fixed scroll and the orbiting scroll are made to face each other in a state where the lap is engaged, and the orbiting scroll is revolved and revolved by an electric motor or the like with respect to the fixed scroll. Then, the refrigerant gas inside the compression chamber is compressed by reducing the volume of the refrigerant gas while moving the compression chamber formed between both laps from the outer peripheral side to the inner peripheral side. For this reason, the refrigerant pressure is higher at the center of the scroll than at the outside of the center, and the temperature of the refrigerant is also higher. Accordingly, the center portion of the scroll always comes into contact with a high-temperature refrigerant to cause thermal expansion in the axial direction and the radial direction. In particular, in the axial direction, when the wrap of the scroll expands and comes into contact with the end plate of the other scroll with an excessive strength, the wrap is deformed. If it does so, the airtightness of a compression chamber will no longer be maintained, the capability to compress a refrigerant | coolant will arise, and malfunctions, such as generating a noise, may arise.

In order to solve these problems, a method of cooling the inside of the compression chamber using liquid injection has been proposed (Patent Document 1).
Liquid injection is a technique in which high-pressure and low-temperature liquid refrigerant in a refrigeration cycle is supplied to the inside of a compression chamber, the temperature of the refrigerant is lowered by latent heat when the liquid refrigerant evaporates, and the inside of the compression chamber is cooled.
In order to suppress the thermal expansion of the scroll, it is desirable to supply the liquid refrigerant to the center of the scroll having a high temperature. However, since the pressure of the refrigerant being compressed is high in the center of the scroll, the liquid refrigerant is compressed into the compression chamber. It is difficult to supply the inside. Therefore, the flow path for supplying the liquid refrigerant is provided in a region where the pressure of the refrigerant located outside the center portion of the fixed scroll is relatively low (hereinafter referred to as an intermediate pressure region).

JP-A-9-105386

However, when the flow path of the liquid refrigerant is provided in the intermediate pressure region of the fixed scroll, the cooling capacity of the liquid refrigerant extends to a portion where the necessity for cooling is low, and the liquid refrigerant is wasted. For this reason, the central portion having a high necessity for cooling cannot be sufficiently cooled, and the thermal expansion of the scroll may not be suppressed. This tendency is particularly noticeable for compressors used under conditions where the discharge pressure is high.
The present invention has been made based on such a problem, and can use liquid injection to reduce the temperature of the center portion of the scroll from which the refrigerant is discharged while supplying the liquid refrigerant to the intermediate pressure region. An object is to provide a scroll compressor.

For this purpose, the scroll compressor according to the present invention is provided with a housing, a revolving scroll provided inside the housing and rotatably connected to the eccentric shaft portion of the main shaft, and the revolving scroll facing the revolving scroll. A scroll type compressor that cools the orbiting scroll and the fixed scroll by supplying liquid refrigerant supplied from the refrigeration cycle to the compression chamber through the refrigerant passage. And the heat insulating material is provided in the one part area | region or the whole region of the refrigerant path, It is characterized by the above-mentioned.
By providing the heat insulating material in the refrigerant passage, the temperature of the liquid refrigerant is supplied to the compression chamber without decreasing. Then, since the compression chamber can be cooled, cooling of the center portion of the fixed scroll is also promoted, so that it is possible to prevent a decrease in the ability to compress the refrigerant in the compression chamber and the occurrence of noise.

The scroll compressor of the present invention forms a housing, a turning scroll provided inside the housing and rotatably connected to the eccentric shaft portion of the main shaft, and a compression chamber for compressing the refrigerant by facing the turning scroll. A scroll type compressor that cools the orbiting scroll and the fixed scroll by supplying liquid refrigerant supplied from the refrigeration cycle to the compression chamber via the refrigerant passage. A back pressure chamber facing the back surface is provided in the middle of the refrigerant passage, and a recess is provided inside the refrigerant passage formed on the fixed scroll on the back surface of the fixed scroll.
By providing the depression on the back surface of the fixed scroll, the surface area of the back surface of the end plate with which the liquid refrigerant comes into contact is increased, so that the cooling of the fixed scroll is promoted. Furthermore, since the recess is provided inside the refrigerant passage, cooling of the center portion of the fixed scroll by the liquid refrigerant is promoted. Therefore, it is possible to prevent a decrease in the ability to compress the refrigerant in the compression chamber and the possibility of noise generation.

The scroll compressor of the present invention forms a housing, a turning scroll provided inside the housing and rotatably connected to the eccentric shaft portion of the main shaft, and a compression chamber for compressing the refrigerant by facing the turning scroll. A scroll type compressor that cools the orbiting scroll and the fixed scroll by supplying liquid refrigerant supplied from the refrigeration cycle to the compression chamber via the refrigerant passage. A back pressure chamber facing the back surface is provided in the middle of the refrigerant passage, and a throttle for expanding the liquid refrigerant discharged from the refrigerant passage to the back pressure chamber is provided.
By passing the diaphragm, the temperature of the liquid refrigerant can be lowered. Therefore, the liquid refrigerant whose temperature has decreased can be supplied to the back pressure chamber as compared with the case where no throttle is provided. Then, since cooling of the center part of a fixed scroll is accelerated | stimulated, the fall of the capability to compress the refrigerant | coolant of a compression chamber and the possibility of generation | occurrence | production of noise can be prevented.

  According to the present invention, since the central portion of the fixed scroll and the orbiting scroll can be cooled while supplying the liquid refrigerant to the intermediate pressure region using the liquid injection, the thermal expansion of the wrap is suppressed, and the wrap is the other side scroll. It is possible to prevent the end plate from being touched more than necessary. Therefore, it is possible to prevent a reduction in the ability to compress the refrigerant generated by the deformation of the wrap and the generation of noise.

It is a longitudinal section showing a scroll type compressor in an embodiment of the present invention. It is a schematic diagram which shows the injection mechanism of this invention. It is the elements on larger scale which show a part of scroll type compressor in a 1st embodiment. It is the elements on larger scale which show a part of scroll type compressor in 2nd Embodiment. (A) is Va-Va sectional drawing of FIG. 4, (b) is sectional drawing which shows a modification. It is the elements on larger scale which show a part of scroll type compressor in 3rd Embodiment.

[First Embodiment]
Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, a scroll compressor 1 (hereinafter referred to as a compressor 1) of the present embodiment includes an electric motor 12 and a scroll compression mechanism 2 driven by the electric motor 12 in a housing 10. ing. The compressor 1 compresses the refrigerant and supplies the refrigerant to a refrigerant circuit such as a refrigeration apparatus. Hereinafter, the configuration of the compressor 1 will be described.

The housing 10 includes a bottomed cylindrical housing main body 101 having an open upper end, and a housing top 102 that covers an opening at the upper end of the housing main body 101.
A suction pipe 13 is provided on the side surface of the housing main body 101 to introduce a refrigerant into the housing main body 101 from an accumulator (not shown).
The housing top 102 is provided with a discharge pipe 14 that discharges the refrigerant compressed by the scroll compression mechanism 2 and an injection pipe 50 that supplies the liquid refrigerant LR. The interior of the housing 10 is partitioned into a low pressure chamber 10A and a high pressure chamber 10B by a discharge cover 40.
In addition, the structural member which comprises the compressor 1 including the housing 10, the fixed scroll 20, the turning scroll 30, and the injection pipe 50 mentioned later is comprised from the metal material suitably selected from an iron type, an aluminum type, etc.

The electric motor 12 includes a stator 15 and a rotor 16.
The stator 15 is provided with a winding that generates a magnetic field when electric power is supplied via a power supply unit (not shown) attached to the side surface of the housing body 101. The rotor 16 includes a permanent magnet and a yoke as main elements, and a main shaft 17 is integrally coupled around the center.

An upper bearing 18 and a lower bearing 19 that rotatably support the main shaft 17 are provided on both ends of the main shaft 17 with the electric motor 12 interposed therebetween.
In the accommodation space 190 formed in the upper bearing 18, an eccentric pin 17A provided at the upper end of the main shaft 17 protrudes and is accommodated.

  The scroll compression mechanism 2 includes a fixed scroll 20 and a turning scroll 30 that revolves with respect to the fixed scroll 20.

[Fixed scroll 20]
The fixed scroll 20 includes a fixed end plate 21 and a spiral wrap 22 erected from one surface of the fixed end plate 21.
The fixed end plate 21 includes an annular convex portion 24 that protrudes from the back surface.
The convex portion 24 is fitted into the concave portion 44 of the discharge cover 40 to form an annular back pressure chamber 46. Therefore, the upper surface 24a of the convex portion 24 constitutes the bottom surface of the back pressure chamber 46, and the back pressure chamber 46 and the injection port 25 communicate with each other.
Note that an O-ring is provided on the outer periphery and the inner periphery of the convex portion 24. The convex part 24 is fitted via these O-rings.
The opening area of the back pressure chamber 46 is set to be larger than the opening area of the injection pipe 50.

The fixed end plate 21 is formed with an injection port 25 penetrating in the axial direction. The liquid refrigerant LR supplied to the back pressure chamber 46 passes through the injection port 25 and flows into the compression chamber PR.
Further, as shown in FIG. 3, a tip seal 28 is provided on the tip surface 22a of the wrap 22 in order to ensure a sealing property between the tip surface 22a and the orbiting end plate 31 of the orbiting scroll 30 facing the tip surface 22a. Is provided.
The tip seal 28 is slid in contact with the orbiting end plate 31 of the orbiting scroll 30 via the lubricating oil, thereby sealing a gap formed between the tip end surface 22a and the orbiting end plate 31. . In order to form an oil film of the lubricating oil, a slight gap G1 is formed between the front end surface 22a and the end plate 31.
In FIG. 1, FIG. 3, FIG. 4 and FIG. 6, the gap G1 is exaggerated. The same applies to a gap G2 to be described later.
The chip seal 28 is a spiral seal material made of, for example, a rubber material such as polyphenylene sulfide (PPS), polyether ether ketone (PEEK), and fluorine rubber, or a composite material thereof.
The fixed scroll 20 is provided so that the central axis thereof coincides with the central axis of the main shaft 17 and forms the orbiting scroll 30 and the compression chamber PR.

[Swivel scroll 30]
The orbiting scroll 30 includes a disc-shaped orbiting end plate 31 and a spiral wrap 32 standing from one surface of the orbiting end plate 31.
A boss 34 is provided on the rear surface of the orbiting end plate 31 of the orbiting scroll 30, and a drive bush 36 is assembled to the boss 34 via a bearing. An eccentric pin 17A is fitted inside the drive bush 36. As a result, the orbiting scroll 30 is eccentrically coupled to the axis of the main shaft 17. Therefore, when the main shaft 17 rotates, the orbiting scroll 30 rotates (revolves) with the eccentric distance from the axis of the main shaft 17 as the orbiting radius.
In addition, an Oldham ring (not shown) that restrains rotation is provided between the orbiting scroll 30 and the main shaft 17 so that the orbiting scroll 30 does not rotate while revolving.
A tip seal 38 is provided on the distal end surface 32a of the wrap 32 in the same manner as the distal end surface 22a of the wrap 22, and is in contact with the fixed end plate 21 through lubricating oil.

  The wraps 22 and 32 that are eccentric with each other by a predetermined amount and are engaged with each other by shifting the phase by 180 degrees contact each other at a plurality of locations according to the rotation angle of the orbiting scroll 30. Then, the compression chamber PR is formed point-symmetrically with respect to the spiral center portions (innermost peripheral portions) of the wraps 22 and 32, and the compression chamber reduces its volume as the orbiting scroll 30 turns. Gradually moved to the inner circumference. The refrigerant is compressed to the maximum at the center of the spiral. The compression chamber PR in FIG. 1 shows this portion.

[Discharge cover 40]
The discharge cover 40 has a discharge port 42 that opens toward the high-pressure chamber 10 </ b> B, and a recess 44 that is continuous in the circumferential direction is formed around the discharge port 42. The back pressure chamber 46 is formed by fitting the convex portion 24 of the fixed scroll 20 described later into the concave portion 44. Therefore, the back pressure chamber 46 faces the upper surface 24a of the convex portion 24 (the back surface of the fixed scroll 20).
The surface of the recess 44 is covered with a heat insulating material 48, and the recess 44 constitutes a portion other than the bottom surface of the back pressure chamber 46. Therefore, the back pressure chamber 46 is covered with a heat insulating material 48 except for the bottom surface.
As the heat insulating material 48, a material having heat resistance and resistance to refrigerants and lubricating oils, for example, polytetrafluoroethylene (PTFE) can be used. As a method of providing the heat insulating material 48 in the recess 44, for example, a baking coating method can be used.

[Injection tube 50]
The injection pipe 50 supplies a low-temperature liquid refrigerant LR from the refrigeration cycle 60 into the housing 10.
The injection pipe 50 is provided through the housing top 102, and one end side thereof is connected to the discharge cover 40 and communicates with the back pressure chamber 46. Therefore, the liquid refrigerant LR that has passed through the injection pipe 50 is supplied to the back pressure chamber 46. On the other hand, the other end side is connected to a branch pipe 68 of the refrigeration cycle 60.
The inner peripheral surface of the injection pipe 50 corresponding to the high-pressure chamber 10B from which a high-temperature refrigerant is discharged from the compression chamber is covered with a heat insulating material 52. The heat insulating material 52 can be provided on the inner peripheral surface of the injection pipe 50 using the same material and method as the heat insulating material 48 described above.
In the present embodiment, the injection pipe 50 is shown as an integral body, but includes a case where a plurality of pipes are joined together. In this case, the heat insulating material 52 is provided on the inner peripheral surfaces of the plurality of pipes.

[Refrigeration cycle 60]
As shown in FIG. 2, the refrigeration cycle 60 includes a compressor 1, a condenser 61, an expansion valve 63, and an evaporator 65 as main elements, which are connected by a pipe 67. The refrigeration cycle 60 eliminates problems that may occur inside the compression chamber PR by supplying a refrigerant having an intermediate pressure between the condenser 61 and the evaporator 65 to the inside of the compression chamber PR of the compressor 1. .
The condenser 61 functions as a radiator that condenses and liquefies a high-temperature and high-pressure gas refrigerant and radiates heat to the outside air. The expansion valve 63 depressurizes and expands the refrigerant passing therethrough to form a low-temperature and low-pressure refrigerant. The evaporator 65 has a function of evaporating and evaporating the low-temperature and low-pressure liquid refrigerant LR to remove heat.

The gas refrigerant compressed by the compressor 1 is discharged from the discharge pipe 14 and then condensed and liquefied by the condenser 61. The liquid refrigerant LR obtained by condensing and liquefying is adiabatically expanded by being throttled by the expansion valve 63 to become a gas-liquid two-phase refrigerant. And the refrigerant | coolant used as the gas-liquid two phase evaporates by the evaporator 65, and returns to the compressor 1 through an accumulator.
A branch pipe 68 that branches from the middle of a pipe 67 that connects the condenser 61 and the expansion valve 63 is connected to the injection pipe 50.
In the liquid injection, the low-temperature and high-pressure liquid refrigerant LR before entering the expansion valve 63 is guided to the injection pipe 50 through the branch pipe 68 and supplied into the compression chamber PR of the compressor 1.
The supply of the liquid refrigerant LR to the inside of the compression chamber PR is performed from an injection port 25 that communicates with the compression chamber using a pressure difference between the pressure inside the compression chamber PR and the supply pressure.

Next, operation | movement of the compressor 1 provided with the above structure is demonstrated.
To start the compressor 1, the electric motor 12 is excited and a refrigerant is introduced into the housing 10 through the suction pipe 13.
When the electric motor 12 is energized, the main shaft 17 rotates, and the orbiting scroll 30 revolves with respect to the fixed scroll 20 accordingly. Then, the refrigerant is compressed in the compression chamber PR between the orbiting scroll 30 and the fixed scroll 20, and the refrigerant introduced into the low pressure chamber 10 </ b> A in the housing 10 from the suction pipe 13 is interposed between the orbiting scroll 30 and the fixed scroll 20. Sucked into. The high-temperature and high-pressure refrigerant compressed in the compression chamber PR sequentially passes through the discharge port 23 of the fixed end plate 21 and the discharge port 42 of the discharge cover 40 and is discharged into the high-pressure chamber 10B. Discharged from the outside. In this way, refrigerant suction, compression, and discharge are continuously performed.

Next, the behavior of the liquid refrigerant LR supplied from the branch pipe 68 will be described.
The injection pipe 50, the back pressure chamber 46, and the injection port 25 are collectively used as a refrigerant passage through which the liquid refrigerant LR passes.
The liquid refrigerant LR which is diverted from the pipe 67 connecting the condenser 61 and the expansion valve 63 and passes through the diversion pipe 68 is supplied to the back pressure chamber 46 via the injection pipe 50.
A part of the liquid refrigerant LR supplied to the back pressure chamber 46 cools the bottom surface of the back pressure chamber 46, that is, the convex portion 24 of the fixed scroll 20. The liquid refrigerant LR passes through the injection port 25 and flows into the compression chamber PR. The liquid refrigerant LR cools and vaporizes the refrigerant inside the compression chamber PR. The vaporized refrigerant is compressed in the compression chamber PR, sequentially passes through the discharge port 23 and the discharge port 42, and is discharged into the high-pressure chamber 10B.

[Action / Effect]
In the compressor 1 according to this embodiment, since the inner peripheral surface of the injection pipe 50 is covered with the heat insulating material 52, the liquid refrigerant LR passing through the injection pipe 50 is caused by the high-temperature refrigerant discharged into the high-pressure chamber 10B. Suppresses being heated. Therefore, the temperature of the liquid refrigerant LR when supplied from the branch pipe 68 can be supplied to the compression chamber PR and the back pressure chamber 46 while maintaining a certain level.
In addition, since the heat insulating material 48 is also provided in the back pressure chamber 46, the liquid refrigerant LR that has flowed into the back pressure chamber 46 is suppressed from being heated by the high-temperature refrigerant through the discharge cover 40.
Therefore, since the compressor 1 can supply the liquid refrigerant LR maintaining a low temperature to the compression chamber PR, it is possible to promote cooling of the center portion of the scroll.
Moreover, in the back pressure chamber 46, the effect of cooling the convex part 24 provided in the center part of the fixed scroll 20 through the upper surface 24a is promoted. If it does so, the thermal expansion in the center part of the fixed scroll 20 and the turning scroll 30 can be suppressed.
As described above, it is possible to minimize the gap G1 between the front end surface 22a of the wrap 22 and the turning end plate 31 and the gap G2 between the front end surface 32a of the wrap 32 and the fixed end plate 21 are minimized. . Therefore, it is possible to avoid the tip surfaces 22a and 32a from coming into strong contact with the end plates 31 and 21, thereby preventing a reduction in the ability to compress the refrigerant in the compression chamber and the occurrence of noise.

[Second Embodiment]
As shown in FIG. 4, the scroll compressor 3 according to the present embodiment is provided with a recess 26 for allowing a refrigerant to flow into the bottom surface of the back pressure chamber 46 of the compressor 1 of the first embodiment. With reference to FIGS. 4 and 5, the differences will be mainly described. In addition, the same code | symbol is attached | subjected to the part similar to 1st Embodiment, and description is abbreviate | omitted.
As shown in FIG. 5A, the recess 26 is provided on the inner side of the injection port 25, and is formed continuously around the discharge port 23 in the circumferential direction. The recess 26 may be provided on the inner side of the injection port 25, but is preferably provided at a position closer to the discharge port 23.
When the liquid refrigerant LR is supplied from the injection pipe 50 to the back pressure chamber 46, a part of the liquid refrigerant LR flows into the recess 26.

[Action / Effect]
By forming the recess 26 facing the back pressure chamber 46 as described above, the second embodiment has the following operations and effects.
Since the recess 26 is formed at a position closer to the discharge port 23 than the injection port 25, the liquid refrigerant LR that has flowed into the recess 26 can promote cooling of the central portion of the fixed end plate 21.
Further, since the depression 26 is provided, the surface area of the convex portion 24 with which the liquid refrigerant LR comes into contact can be said to be large, so that the cooling of the central portion of the fixed end plate 21 by the liquid refrigerant LR is promoted.
Therefore, compared to the case where the recess 26 is not provided, the cooling of the central portion of the fixed end plate 21 is promoted, so that the ability to compress the refrigerant in the compression chamber is reduced and noise is generated, as in the first embodiment. Can prevent the risk of

In this embodiment, instead of the continuous depression 26, a plurality of depressions 27 can be intermittently provided around the discharge port 23 as shown in FIG. In this case, the same effect as that provided by the depression 26 can be enjoyed.
Note that both the recess 26 and the recess 27 can be provided on the upper surface 24a.

[Third Embodiment]
The present embodiment is different from the first embodiment in that when the liquid refrigerant LR is supplied from the injection pipe 50 to the back pressure chamber 46, the throttle portion 29 is once passed.
Hereinafter, the scroll compressor 5 according to the present embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part similar to 1st Embodiment, and description is abbreviate | omitted.
As shown in FIG. 6, the discharge cover 40 is provided with a connection hole for connecting the injection pipe 50 and a throttle portion 29 communicating with the connection hole.
Since the throttle unit 29 vaporizes a part of the liquid refrigerant LR by reducing the pressure, the temperature of the liquid refrigerant LR is lowered and supplied to the back pressure chamber 46.
Since the opening area of the throttle portion 29 is set smaller than the opening area of the back pressure chamber 46, the liquid refrigerant LR that has passed through the throttle portion 29 expands. When expanded, the pressure of the liquid refrigerant LR decreases, and the liquid refrigerant LR vaporizes.

[Function and effect]
By forming the throttle portion 29 as described above, the third embodiment has the following operations and effects.
By passing the liquid refrigerant LR through the throttle unit 29, the temperature of the liquid refrigerant can be lowered.
Therefore, the liquid refrigerant LR having a lowered temperature can be supplied to the back pressure chamber 46 as compared with the case where the throttle portion 29 is not provided. As a result, cooling of the central portion of the fixed end plate 21 is promoted, so that the ability to compress the refrigerant in the compression chamber and the possibility of noise generation can be prevented as in the first embodiment.
The throttle portion 29 may be formed inside the injection pipe 50, or a separate throttle valve may be provided between the injection pipe 50 and the discharge cover 40. In either case, since the liquid refrigerant LR having a lowered temperature can be supplied to the back pressure chamber 46, the above-described effects can be enjoyed.

Although the present embodiment has been described above, the configuration described in the above embodiment can be selected or changed to other configurations as appropriate without departing from the gist of the present invention. .
For example, in this embodiment, in addition to the inner peripheral surface of the injection pipe 50, the outer peripheral surface can be covered with the heat insulating material 52. Then, the liquid refrigerant LR passing through the injection pipe 50 can be further suppressed from being heated by the high-temperature refrigerant in the high-pressure chamber 10 </ b> B, so that the liquid refrigerant LR maintaining the temperature can be supplied to the back pressure chamber 46. Further, even when only the outer peripheral surface of the injection pipe 50 is covered with the heat insulating material 52, the liquid refrigerant LR can be prevented from being heated.
In addition, a heat insulating material can also be provided in the whole area | region of a refrigerant path, and it can prevent that the liquid refrigerant LR is heated also in that case.

Moreover, even when the recess 26 in the second embodiment is divided and provided in the circumferential direction, the effect of cooling the central portion of the fixed end plate 21 can be obtained. If the depressions 26 are formed continuously in the circumferential direction, the central portion of the fixed end plate 21 can be cooled uniformly, so that it is preferable that the depressions 26 are formed continuously in the circumferential direction. A plurality of recesses 26 can be provided in the radial direction.
In the second embodiment, a heat transfer wall that protrudes toward the back pressure chamber 46 can be formed instead of providing the recess 26. When the heat transfer wall is provided, the area of the fixed end plate 21 that is cooled by the liquid refrigerant LR is increased, so that the central portion of the fixed end plate 21 can be cooled.

1,3,5 scroll type compressor (compressor)
2 Scroll type compression mechanism 10 Housing 10A Low pressure chamber 10B High pressure chamber 12 Electric motor 13 Suction pipe 14 Discharge pipe 15 Stator 16 Rotor 17 Main shaft 17A Eccentric pin 18 Upper bearing 19 Lower bearing 20 Fixed scroll 21 Fixed end plate (end plate)
22 Lap 22a Front end surface 23 Discharge port 24 Convex portion 24a Top surface 25 Injection ports 26, 27 Recess 28 Tip seal 29 Throttle portion 30 Revolving scroll 31 Revolving end plate (end plate)
32 Lap 32a Front end surface 34 Boss 36 Drive bush 38 Chip seal 40 Discharge cover 42 Discharge port 44 Recess 46 Back pressure chamber 48 Thermal insulation material 50 Injection pipe 52 Thermal insulation material 60 Refrigeration cycle 61 Condenser 63 Expansion valve 65 Evaporator 67 Piping 68 Split flow Tube 101 Housing body 102 Housing top 190 Accommodating space G1, G2 Gap LR Liquid refrigerant PR Compression chamber

Claims (3)

A housing;
A turning scroll provided inside the housing and rotatably connected to an eccentric shaft portion of the main shaft;
A fixed scroll that forms a compression chamber that compresses the refrigerant by facing the orbiting scroll, and
A scroll type compressor that cools the orbiting scroll and the fixed scroll by supplying liquid refrigerant supplied from a refrigeration cycle to the compression chamber via a refrigerant passage,
A heat insulating material is provided in a partial region of the refrigerant passage;
A scroll compressor characterized by that. A housing;
A turning scroll provided inside the housing and rotatably connected to an eccentric shaft portion of the main shaft;
A fixed scroll that forms a compression chamber that compresses the refrigerant by facing the orbiting scroll, and
A scroll type compressor that cools the orbiting scroll and the fixed scroll by supplying liquid refrigerant supplied from a refrigeration cycle to the compression chamber via a refrigerant passage,
A back pressure chamber facing the back of the fixed scroll is provided in the middle of the refrigerant passage,
A recess is provided on the back surface of the fixed scroll, inside the refrigerant passage formed in the fixed scroll.
A scroll compressor characterized by that. A housing;
A turning scroll provided inside the housing and rotatably connected to an eccentric shaft portion of the main shaft;
A fixed scroll that forms a compression chamber that compresses the refrigerant by facing the orbiting scroll, and
A scroll type compressor that cools the orbiting scroll and the fixed scroll by supplying liquid refrigerant supplied from a refrigeration cycle to the compression chamber via a refrigerant passage,
A back pressure chamber facing the back of the fixed scroll is provided in the middle of the refrigerant passage;
A throttle for expanding the liquid refrigerant discharged from the refrigerant passage to the back pressure chamber is provided.
A scroll compressor characterized by that.

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