JP5385873B2 - Refrigerant compressor - Google Patents

Description

  The present invention relates to a refrigerant compressor for refrigeration and air conditioning, and more particularly to improvement of a bearing sliding portion of the refrigerant compressor.

In the refrigerant compressor, in order to prevent seizure and wear of the bearing, which is a sliding portion where mechanical parts slide relative to each other, a bearing material with an adjusted surface material has been developed. For example, in accordance with the RoHs directive (European Parliament and Council Directive on restrictions on the use of specific hazardous substances contained in electricity and electrical equipment), sliding materials containing PTFE as the main component and not containing lead are used as bearing materials. Dynamic characteristics are obtained.
Examples of the conventional technology of the sliding material containing PTFE as a main component and not containing lead include those described in Patent Document 1.

JP 2002-53673 A

  In recent years, interest in energy reduction has increased, and various industries have been demanding improved efficiency. In particular, in air conditioners that are closely related to the living environment, public attention is high, and therefore development of products that can achieve lower costs and higher efficiency is required.

  In air conditioners, annual energy consumption efficiency (APF) has been used as a standard for efficiency since the revision of the Energy Saving Law in 2006. APF is the efficiency of the air conditioner in accordance with the state of use, and importance is placed on the efficiency in the load region lower than the rated condition, so the frequency of operation in the low speed rotation region is increasing in the refrigerant compressor.

  However, when the refrigerant compressor is operated at a low speed, the bearing which is a sliding portion cannot secure a sufficient oil film thickness, and easily moves to the boundary lubrication region. Furthermore, since the refrigerant dissolves in the refrigerating machine oil, the viscosity of the oil decreases. As a result, there is a problem in that metal contact is induced and problems such as galling, seizure, and wear are likely to occur, and the performance and quality of the refrigerant compressor are deteriorated.

  An object of the present invention is to obtain a highly reliable refrigerant compressor that can suppress the occurrence of galling or seizure in a bearing sliding portion and can improve wear resistance.

  In order to achieve the above object, the present invention comprises a compression mechanism section that compresses a refrigerant and a rotation shaft that drives the compression mechanism section, and an engagement section between the rotation shaft and the compression mechanism section, or the rotation. In the refrigerant compressor provided with the slide bearing in at least one of the rotation support portions that support the shaft, the slide bearing is configured using a lead-free resin impregnated material having a foreign matter burying property for burying the wear particles, The rotating shaft is made of an iron-based material, and a hard coating having a hardness of 1000 Hv or more is provided on a portion of the rotating shaft that slides with the slide bearing.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect which can obtain the highly reliable refrigerant compressor which can suppress generation | occurrence | production of the galling and seizure in a bearing sliding part, and can also improve abrasion resistance.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing a first embodiment of a refrigerant compressor according to the present invention. FIG. 2 is an enlarged cross-sectional view of the vicinity of a plain bearing portion in FIG. 1. The graph which shows the relationship between the hardness of the hard film coat | covered on the rotating shaft, and the amount of bearing wear. It is a figure explaining the modification of FIG. 2, and is expanded sectional view equivalent to FIG. The expanded sectional view explaining an example which provides a hard film in a base material. The expanded sectional view explaining the other example which provides a hard film in a base material. The expanded sectional view explaining the further another example which provides a hard film in a base material.

The year-round energy consumption efficiency (APF) in an air conditioner is the efficiency of the air conditioner according to the state of use, and importance is placed on the efficiency in a load region lower than the rated point. For this reason, the refrigerant compressor is often operated at a low speed.
However, when the refrigerant compressor is operated at a low speed, as described above, the oil film thickness at the bearing cannot be ensured sufficiently at the low speed operation, and the transition to the boundary lubrication region is likely. As a result, metal contact is induced and problems such as galling, seizure, and wear are easily caused, and the performance and quality of the refrigerant compressor are deteriorated.

As described in Patent Document 1, a resin material such as PTFE, which is an impregnation material, is also used as a bearing for a refrigerant compressor. Such a resin material includes wear particles (foreign matter) such as metal particles. ) Is embedded in the resin material, and has an effect of reducing galling and wear due to wear particles. However, under circumstances where the oil film thickness of the bearing lubricating oil is extremely reduced at low speed operation, the metal particles (wear particles) embedded in the resin material and the rotating shaft cause metal contact, which causes galling and seizure. It has been found that there is a problem of developing.
Specific examples for solving this problem will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a first embodiment of the refrigerant compressor of the present invention, which is an example in which the present invention is applied to a scroll compressor as a refrigerant compressor.
In the hermetic container 700, a compression mechanism portion is disposed above, an electric motor 600 is disposed at the center, and an oil sump 730 is disposed below. The compression mechanism portion and the electric motor 600 are arranged via a rotating shaft 300 made of an iron-based material. Is connected. The compression mechanism section is formed by meshing a fixed scroll 100 with a spiral wrap 102 upright on a base plate 101 and an orbiting scroll 200 with a spiral wrap 202 upright on a base plate 201. Yes. The fixed scroll 100 is also provided with a suction port 103 and a discharge port 104. The rotating shaft 300 is supported by a slide bearing (main bearing) 401 provided on the frame 400 at the upper part of the electric motor and a sub bearing 801 provided on the lower frame 800 at the lower part of the electric motor. The frame 400 and the lower frame 800 are fixed to a sealed container 700. A crankpin (eccentric shaft) 301 made of an iron-based material is provided at the tip of the rotary shaft 300, and the crankpin 301 is inserted into a boss portion 203 protruding below the base plate 201 of the orbiting scroll 200. Has been engaged. A slewing plain bearing 210 is provided in the boss portion 203 and is configured to slide with the crank pin 301. Further, an Oldham joint 500 is disposed on the back surface of the base plate 201 of the orbiting scroll 200, and the orbiting scroll 200 is orbited by the Oldham joint 500 without rotating with respect to the fixed scroll 100.

  When the rotary shaft 300 connected to the rotor is rotated by the electric motor 600, the rotation causes the crank pin 301 provided at the tip of the rotary shaft 300 to rotate eccentrically, and the orbiting scroll 200 is provided with a rotation prevention mechanism for the Oldham coupling 500. Thus, a turning motion is performed without rotating about the fixed scroll 100. As a result, the gas is sucked into the sealed chamber formed by the spiral wraps 102 and 202 through the suction pipe 711 and the suction port 103, and the sealed chamber moves toward the central portion side with the swirling motion. The volume is reduced while the gas is compressed, and the compressed gas is discharged from the discharge port 104 to the discharge chamber 710. The gas discharged into the discharge chamber 710 circulates around the compression mechanism section and the electric motor section, and is then discharged from the discharge pipe 701 to the outside of the compressor.

  Next, the oil supply path will be described. A bearing housing 802 that accommodates the auxiliary bearing 801 is attached to the lower frame 800, and a pump unit 900 is provided at the lower end of the bearing housing 802. The pump unit 900 is driven via a pump joint 310 attached to the lower end of the rotating shaft 300. When the rotating shaft 300 rotates, the oil in the oil reservoir 730 is sucked up by the pump unit 900 and reaches the upper portion of the crank pin 301 from the pump unit 900 via an oil passage 311 formed in the rotating shaft. From the upper part of the crank pin, the oil lubricates the swivel slide bearing 210 and then flows to the slide bearing 401. The oil lubricated the slide bearing 401 passes through the oil drain pipe 408 and returns to the oil reservoir 730.

  Part of the oil after lubricating the orbiting slide bearing 210 passes through a seal portion 402 provided between the bottom surface of the boss portion 203 of the orbiting scroll and the frame 400 and the base plate 201 of the orbiting scroll. From here, the sliding portion between the fixed scroll 100 and the orbiting scroll 200 and the space between the laps 102 and 202 are lubricated through the oil supply passage 220 formed on the orbiting scroll base plate 201 and discharged together with the compressed gas. It is discharged into the chamber 710. The oil discharged into the discharge chamber 710 then returns to the oil reservoir 730 below the sealed container 700.

  FIG. 2 is an enlarged cross-sectional view of the vicinity of the slewing slide bearing 210 and the slide bearing (main bearing) 401 shown in FIG. 1, and the portions denoted by the same reference numerals as those in FIG. 1 are the same portions.

  In this embodiment, a lead-impregnated resin-impregnated material is used for the sliding bearings such as the swivel sliding bearing 210 and the sliding bearing 401, and the surface (outer peripheral surface) of the rotating shaft 300 that slides on the sliding bearing (main bearing) 401. Further, a hard coating 1000 having a hardness of 1000 Hv or more (preferably 1500 Hv or more) is provided on the surface (outer peripheral surface) of the crank pin 301 that slides with the orbiting slide bearing 210.

  As the lead-free resin impregnated material, a resin material having a foreign substance burying property such as PTFE (polytetrafluoroethylene) is used. In addition, POM (polyacetal), PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), PEEK (polyetheretherketone), and the like can be used as the resin material having the foreign substance burying property. By using such a resin material having a foreign substance embedding property, wear particles (foreign substances) such as metal particles can be embedded in the resin material, and therefore the sliding bearing is galling or worn by the wear particles. Can be reduced.

  However, when the refrigerant compressor is operated at a low speed, an oil film breakage may occur in a situation where the oil film thickness of the bearing lubricating oil is extremely reduced. In such a case, in a lead-free resin-impregnated bearing with a high foreign substance burying property, the buried metal particles (wear particles) and the rotating shaft (including the crankpin) are brought into metal contact and develop into galling and seizure. There is a fear.

  In order to deal with this problem, in this embodiment, the surface (outer peripheral surface) of the rotary shaft 300 and the crank pin 301 that slides with the slide bearing 401 or the swing slide bearing 210 has a hardness of 1000 Hv or more (preferably 1500 Hv or more). Since the hard coating 1000 is provided, it is possible to significantly reduce the wear of the rotating shaft and the crankpin due to the wear particles and the occurrence of galling and linear scratches. That is, since the hardness of the wear particles embedded in the lead-free resin-impregnated bearing in the refrigerant compressor is almost less than 1000 Hv, the rotating shaft 300 (including the crank pin) is worn by the wear particles, or is galling or linear. It has been found that the occurrence of scratches can be greatly reduced, and in particular, by using a hard coating of 1500 Hv or higher, the shaft galling, seizure, and wear hardly proceed.

  However, when the hardness of the hard coating is further increased, the effect on the wear of the rotating shaft and the linear scratches is almost the same, but if the hardness is too high, for example, a hardness that greatly exceeds 3000 Hv, for example, a hardness of 4000 Hv It is not preferable to use a hard coating having a surface of the lead-free resin-impregnated bearing that slides on the shaft due to the effect of roughness and waviness on the surface of the rotating shaft, unevenness of the shaft surface due to peeling of the hard coating, and the like. .

  FIG. 3 is a graph showing the relationship between the hardness of the hard coating coated on the rotating shaft and the amount of bearing wear of the lead-free resin-impregnated bearing. This graph confirms a refrigerant compressor (scroll compressor) by performing a severe sliding test in a boundary lubrication region where it is difficult to form an oil film at low speed. The horizontal axis indicates the type of hard coating on the surface of the rotating shaft ( Hardness of hard coating), non-coating (A) uses S45C as an iron-based material, the sliding part is hardened to a hardness of about 600 Hv by hardening, and DCL (B) is iron-based The rotating shaft surface is a rotating shaft with a DLC coating (hard carbon coating) having a hardness of 3000 Hv, and DLC (C) is a rotating shaft with a DLC coating having a hardness of 4000 Hv on the rotating shaft surface of a ferrous material. . The vertical axis is based on the amount of wear of a lead-free resin-impregnated bearing with a foreign substance burying property that slides when a non-coated (A) rotating shaft is used, and has another hard coating. The bearing wear amount (specific wear amount) of the lead-free resin-impregnated bearing having a foreign substance burying property that slides with the rotating shafts DLC (B) and DLC (C) is shown.

  From FIG. 3, when a rotating shaft coated with a DLC film having a hardness of 3000 Hv is used, the bearing wear amount of the lead-free resin-impregnated bearing that slides on the non-coated (A) rotating shaft is determined as follows. It is lower than when used. Further, the damaged state of the rotating shaft and the bearing after sliding was good, and neither the rotating shaft nor the bearing was found to have a linear scratch.

  On the other hand, when a rotating shaft coated with a DLC film having a hardness of 4000 Hv is used, the amount of bearing wear is greater than when a non-coating (A) rotating shaft is used. Further, it was confirmed that a linear scratch was generated in the bearing after sliding.

  From the results shown in FIG. 3, by using a rotating shaft with a hard coating having a hardness of 3000 Hv or less, the amount of wear of a lead-free resin-impregnated bearing with foreign matter burying ability is reduced and the occurrence of linear scratches is also observed. I found that it can be prevented.

  In addition, as described above, the rotating shaft with a hard coating having a hardness of 1000 Hv or more is used in order to keep the rotating shaft in a good state without causing galling or seizure even when it comes into contact with wear particles such as metal particles. It is preferable to use it. Therefore, in this embodiment, bearing sliding such as the swinging slide bearing 210, the sliding bearing 401, the rotating shaft 300, and the crank pin 301 is performed by applying a hard coating having a hardness in the range of 1000Hv to 3000Hv (preferably 1500 to 3000Hv). The occurrence of galling and seizure in the section can be suppressed, and wear can be reduced, so that a highly reliable refrigerant compressor that can improve wear resistance can be obtained.

  FIG. 4 shows a modification of FIG. 2, and the same reference numerals as those in FIG. 2 denote the same or corresponding parts. In the example shown in FIG. 2, the hard coating 1000 is formed directly on the outer peripheral surface of the rotating shaft (including the crankpin) 300 by vapor deposition or the like, but in the example shown in FIG. A hard coating is provided by fitting a cylindrical member 302 made of an iron-based material provided with a hard coating 1000 on the surfaces of the rotary shaft 300 and the crank pin 301 that slide with the slide bearing 401. That is, a hard film having a hardness of 1000 Hv or more (preferably 1500 Hv or more) formed by vapor deposition or the like on the outer peripheral surface of the cylindrical member 302 made of an iron-based material is manufactured in advance, and the cylindrical member 302 is turned into a swivel slide bearing 210. The sliding shaft 401 and the rotating shaft 300 and the crank pin 301 that slide with the sliding bearing 401 are fitted to each other. According to this example, the productivity is about 5 to 5 compared with the example shown in FIG. It becomes possible to improve 10 times, and as a result, the cost of the refrigerant compressor can be reduced.

FIG. 5 is a diagram showing a configuration of the base material (rotating shaft 300 and cylindrical member 302) and the hard coating 1000 shown in FIG. 2 and FIG.
In FIG. 5, the base material for forming a hard coating on the surface is a rotating shaft (including a crankpin) 300 shown in FIG. 2, or a cylindrical member 302 fitted to the rotating shaft as shown in FIG. is there. A hard coating 1000 having a hardness of, for example, 1500 Hv is formed on the surface of the substrate. The hard coating 1000 includes a chromium-based (Cr-based) coating (for example, CrN), a titanium-based (Ti-based) coating (for example, TiN), a hard carbon-based coating (DLC), and a Si-containing hard carbon-based coating (Si: DLC). These hard coatings 1000 can be formed on the surface of the substrate by coating the substrate with a vapor deposition method or the like. The hard coatings described above all have high corrosion resistance, high hardness and low friction coefficient, and are suitable as a sliding material that slides on a slide bearing. In particular, DLC (Diamond-Like Carbon), which is a hard carbon-based film, has a mixture of SP ³ bonds constituting diamond and SP ² bonds having a graphite structure, and its hardness can be adjusted by adjusting coating conditions. It can be adjusted by various changes.

  Since each of the hard coatings described above can improve the smoothness of the surface, physical wear and friction are hardly caused, and a hard coating having a hardness of 1500 Hv or more can be easily obtained. Therefore, by providing any of the hard coatings described above on the surface of the rotating shaft that slides with the slide bearing, a refrigerant compressor that can suppress the occurrence of galling and seizure at the sliding portion of the bearing and can also improve wear resistance. Can be obtained.

  FIG. 6 is an enlarged cross-sectional view for explaining another example in which a hard film is provided on a base material, and the portions denoted by the same reference numerals as those in FIG. 5 indicate the same or corresponding portions. In the example of FIG. 5, when the hardness of the iron-based material (base material) constituting the rotary shaft 300 is low, when a hard coating with high hardness, for example, a DLC coating with high hardness, is formed, the hardness difference between them increases, During the operation of the compressor, the hard coating 1000 may be peeled off due to deformation of the sliding portion or the like. The example shown in FIG. 6 explains a method for forming a hard coating on a substrate that is effective in preventing the hard coating 1000 from peeling off.

  In this example, an intermediate layer 1001 having an intermediate hardness between the base material and the hard film is provided between the hard film 1000 and the base material (the rotary shaft 300 or the cylindrical member 302). That is, the rotating shaft 300 and the cylindrical member 302 made of an iron-based material are used as a base material, and an intermediate layer 1001 made of a Cr-based film having a hardness of about 1000 to 1500 Hv is first formed on the base material. A hard coating 1000 made of a DLC coating having a hardness of about 2000 to 3000 Hv is formed thereon. According to this example, since a hard coating with higher hardness can be formed on the sliding surface, wear and seizure of the bearing sliding portion can be prevented, and the intermediate layer 1001 has good adhesion to the iron-based substrate. Since the Cr-based coating is provided, a highly reliable refrigerant compressor that can prevent the peeling of the hard coating can be obtained. Also in this example, the intermediate layer 1001 and the hard coating 1000 can be formed using a vapor deposition method or the like.

  FIG. 7 is an enlarged cross-sectional view for explaining still another example in which a hard film is provided on a base material, and the portions denoted by the same reference numerals as those in FIG. 5 indicate the same or corresponding portions. The example shown in FIG. 7 is the same as the example shown in FIG. 5 in that the rotating shaft 300 and the cylindrical member 302 made of an iron-based material are used as the base material, and the hard coating 1000 is formed on the base material. The hard coating 1000 is characterized in that it is an inclined film whose hardness gradually increases from the base material side to the sliding surface side. In this example, a Si-containing carbon-based coating (Si: DLC) is used as the hard coating 1000, and the gradient film gradually reduces the Si amount (Si concentration) of the coating from the substrate surface side to the sliding surface side. The hardness of the hard coating 1000 on the substrate side is about 1000 Hv, and the hardness on the sliding surface side is 1500 Hv or more. A hard film made of such a gradient film can also be formed on the surface of the substrate by vapor deposition or the like.

  In the hard coating 1000, the lower layer (base material side) and the upper layer (sliding surface side) do not form a complete boundary of composition, but gradually change from DLC to DLC: Si from the sliding surface side to the base material side. Examples of the method for forming the inclined film include an ion plating (IP) method, an ion deposition method, and a sputtering method. Even if it is a formation method other than these, as long as the film hardness which satisfy | fills the target hardness range is obtained, it can be used.

Here, a method of forming the DLC: Si gradient film using an arc ion plating (AIP) method which is a kind of the IP method will be described. In the AIP method, the base material (the rotating shaft 300 or the cylindrical member 302) is disposed in a vacuum chamber having a vacuum degree of 10 ⁻³ to 10 ⁻⁵ Pa, and a negative bias is applied thereto. On the other hand, the ionized raw material for producing the hard coating is electrically accelerated and collides with the substrate to form the hard coating on the substrate surface.

When forming a hard coating of DLC: Si, a hydrocarbon-based gas such as C ₆ H ₆ or C ₂ H ₂ is introduced for the formation of DLC, and silane such as tetramethylsilane is used as a raw material for Si as an additive. System gas is introduced.

  At the start of vapor deposition by the AIP method, both the hydrocarbon-based gas and the silane-based gas are introduced into a vacuum chamber, so that a DLC: Si coating corresponding to the amount of silane-based gas introduced is first applied to the surface of the substrate. Is formed. Thereafter, by gradually reducing the amount of silane-based gas introduced, it is possible to form an inclined film in which the Si concentration gradually decreases from the base material side to the sliding surface side. In the DLC: Si coating, the higher the Si concentration, the lower the hardness, and the lower the Si concentration, the higher the hardness. Therefore, the base material side has a hardness close to the base material (for example, a hardness of 1000 Hv), and the sliding surface side. The hardness can be made higher as it gets closer to, and the hardness can be 2000 to 3000 Hv on the sliding surface.

  By configuring in this way, high sliding characteristics can be obtained even in the metal contact state at the time of initial sliding, and the amount of Si gradually increases toward the base material, so that the adhesion between the hard coating and the base material is improved. The hard coating is less likely to be peeled off. Therefore, according to this example, there is an effect that a refrigerant compressor that can further improve the reliability can be obtained. In addition, it is desirable that the Si amount of the hard coating 1000 near the substrate is approximately 20 at.% From the viewpoint of adhesion to the substrate.

  According to the present embodiment described above, the plain bearing is configured by using a lead-free resin impregnated material having a foreign substance burying property that embeds wear particles, and the rotating shaft is configured by an iron-based material. Since the portion that slides with the slide bearing is provided with a hard coating having a hardness of 1000 Hv or more, even when the refrigerant compressor is operated at a low speed rotation and the oil film thickness of the slide bearing portion is reduced, it can rotate. It is possible to obtain a highly reliable refrigerant compressor that can prevent galling and seizure from occurring on the sliding surface between the shaft and the lead-free resin-impregnated bearing.

  In other words, the use of lead-free resin impregnated material having foreign substance embeddability not only reduces the occurrence of galling and wear on the rotary shaft and plain bearing, but also wear particles are embedded in the resin-free resin impregnated material. Even when the oil film thickness cannot be secured due to low-speed operation and the transition to the boundary lubrication region occurs and the buried wear particles and the rotation shaft make metal contact, the surface of the rotation shaft has higher hardness than the wear particles. Since the hard coating having good slidability is provided, it is possible to secure good slidability by suppressing the galling and seizure of the rotating shaft. Therefore, according to the present embodiment, even during low-speed operation of the refrigerant compressor, it is possible to suppress the occurrence of galling and seizure in the bearing sliding portion, to obtain good slidability and to improve wear resistance. A highly reliable refrigerant compressor can be obtained.

100 fixed scroll (101: base plate, 102: lap, 103: suction port, 104: discharge port)
200 orbiting scroll (201: base plate, 202: lap, 203: boss, 210: orbiting slide bearing, 220: oil supply path)
300 Rotating shaft (301: Crank pin, 302: Cylindrical member, 310: Pump joint, 311: Oil passage)
400 frame (401: plain bearing, 402: seal part, 408: oil drain pipe)
500 Oldham coupling 600 Electric motor 700 Sealed container (701: Discharge pipe, 710: Discharge chamber, 711: Suction pipe, 730: Oil reservoir)
800 Lower frame (801: secondary bearing, 802: bearing housing)
900 Pump unit 1000 Hard coating 1001 Intermediate layer.

Claims (7)

A compression mechanism section that compresses the refrigerant; and a rotation shaft that drives the compression mechanism section; and at least one of an engagement section between the rotation shaft and the compression mechanism section, or a rotation support section that supports the rotation shaft. In a refrigerant compressor equipped with a sliding bearing,
The slide bearing is composed of a lead-free resin impregnated material having foreign matter burying property for burying wear particles,
The rotary shaft is made of an iron-based material, and a hard coating having a hardness of 1000 Hv or more is provided on a portion of the rotary shaft that slides with the slide bearing.   The refrigerant compressor according to claim 1, wherein the hardness of the hard coating is 1500 to 3000 Hv.   3. The refrigerant compressor according to claim 1, wherein the hard coating provided on the rotary shaft forms a hard coating on an outer peripheral surface of a cylindrical member made of an iron-based material, and the cylinder having the hard coating formed thereon. A refrigerant compressor provided by fitting a member to the rotating shaft.   The refrigerant compressor according to any one of claims 1 to 3, wherein the hard coating is at least one of a chromium-based coating, a titanium-based coating, a hard carbon-based coating, and a Si-containing hard carbon-based coating. Refrigerant compressor.   5. The refrigerant compressor according to claim 4, wherein the hard coating forms a chromium-based coating on a surface of a base material of an iron-based material constituting the rotating shaft, and the chromium-based coating is formed on the chromium-based coating from the chromium-based coating. A refrigerant compressor characterized in that a hard carbon-based film having high hardness is formed.   5. The refrigerant compressor according to claim 4, wherein the hard coating is a Si-containing hard carbon-based coating, and the Si-containing hard carbon-based coating slides from the surface of a base material of an iron-based material constituting the rotating shaft. A refrigerant compressor characterized in that it is formed in an inclined film whose Si concentration decreases over the surface.   The refrigerant compressor according to any one of claims 1 to 6, wherein the compression mechanism unit is a scroll compressor configured by combining a fixed scroll having a spiral wrap on a base plate and a turning scroll. A featured refrigerant compressor.

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