JP2010196630A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor suppressing heat transfer to suction side refrigerant gas from a lubricating oil separation chamber. <P>SOLUTION: In the compressor (100), lubricating oil is mixed in refrigerant. The compressor (100) includes a lubricating oil separator, which separates lubricating oil from mixed fluid of refrigerant and lubricating oil, and which comprises a lubricating oil separation chamber (400) forming a cylindrical space communicating to a delivery chamber (290) and a separator pipe (410) disposed inside of the lubricating oil separation chamber (400), and a heat insulation member (420) on an inner wall surface of the lubricating oil separation chamber (400). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a compressor.

  Conventionally, a revolving scroll member is engaged with a fixed scroll member, and after compressing the refrigerant gas in a compression chamber formed between both scroll members, the compressed refrigerant gas is discharged by a substrate and a housing of the fixed scroll member. In a compressor that discharges to the outside, a compressor in which a heat insulating member is provided on an inner surface or an outer surface of a discharge chamber is known.

JP-A-2005-146958

  However, the refrigerant contains lubricating oil for the purpose of lubricating the inside of the compressor. When an oil separator that separates the refrigerant and the lubricating oil is provided in the compressor, heat is transferred from the oil separator to the suction side gas. For this reason, there has been a problem that the volumetric efficiency during compression is reduced.

  In view of the above problems, an object of the present invention is to provide a compressor that suppresses heat transfer from a high-temperature fluid in an oil separator to a compressor suction-side fluid.

  In order to solve the above-mentioned object, the invention described in claim 1 includes a housing (101) constituting an outer shell of the compressor (100), a suction port provided in the housing (101), and a housing (101) A compression mechanism (200) for compressing the refrigerant, a suction path for guiding the refrigerant sucked from the suction port to the compression mechanism (200), and a housing (101) for compression by the compression mechanism (200). A discharge chamber (290) through which the discharged refrigerant is discharged, and the lubricant is mixed with a lubricant, and in the housing (101), a lubricant separator that separates the lubricant from the fluid mixture of the refrigerant and the lubricant The lubricating oil separator includes a lubricating oil separating chamber (400) that forms a cylindrical space communicating with the discharge chamber, and a separator pipe (410) disposed inside the lubricating oil separating chamber (400). Are characterized by the inner wall surface of the lubricating oil separation chamber (400) comprises a heat insulating member (420).

  Since heat transfer from the lubricating oil separation chamber (400) to the suction side refrigerant is suppressed, a decrease in volumetric efficiency during compression can be reduced.

  The invention according to claim 2 is characterized in that the heat insulating member (420) is provided in close contact with the inner wall surface of the lubricating oil separation chamber (400).

  Since the heat from the lubricating oil separation chamber (400) can be directly suppressed by bringing the heat insulating member (420) into close contact with each other, the effect of suppressing the temperature rise with respect to the sucked refrigerant can be enhanced.

  Further, as in the invention described in claim 3, the heat insulating member (420) may be mechanically fixed to the inner wall surface of the lubricating oil separation chamber (400).

  The invention described in claim 4 is characterized in that a discharge chamber heat insulating member is provided on the inner wall surface of the discharge chamber (290).

  By providing a discharge chamber heat insulating member in the discharge chamber (290) as well as the lubricating oil separation chamber (400), heat transfer to the suction side refrigerant can be further suppressed. A decrease in efficiency can be reduced.

  Moreover, it is good also as a compressor which has a scroll type compression mechanism (240,250) as a compression mechanism like invention of Claim 5.

It is a partial sectional view showing the compressor in a 1st embodiment of the present invention. It is AA sectional drawing of FIG. 1 in 1st Embodiment of this invention. It is an enlarged view of the characteristic part in 1st Embodiment of this invention. It is a Mollier diagram in a 1st embodiment of the present invention. It is an enlarged view of the characteristic part in 2nd Embodiment of this invention. It is an enlarged view of the characteristic part in 3rd Embodiment of this invention. It is an enlarged view of the characteristic part in 4th Embodiment of this invention. It is a figure which shows the improvement effect in other embodiment of this invention.

(First embodiment)
Hereinafter, an embodiment in which the present invention is applied to a scroll compressor used in a vehicle air conditioner will be described with reference to FIGS. 1, 2, 3 and 4.

  FIG. 1 is a diagram showing a compressor in the present embodiment. FIG. 2 is a cross-sectional view taken along the line AA indicated in FIG. FIG. 3 is an enlarged view of a characteristic portion in the present embodiment.

As shown in FIG. 1, the compressor 100 is an electric compressor in which an electric motor unit 300 is integrally provided in a scroll-type compression mechanism unit 200 and the compression mechanism unit 200 is operated by the electric motor unit 300. .
The compression mechanism unit 200 and the electric motor unit 300 are accommodated in a housing 101 including a front housing 101a and a rear housing 101b. Moreover, the compression mechanism part 200 and the electric motor part 300 are delimited by an inner housing 105 assembled in the front housing 101a.

    The electric motor unit 300 includes a rotor 310 that is fixed to the shaft 211 and a stator 320 that is shrink-fitted and fixed to the inner wall of the housing 101 on the outer peripheral side of the rotor 310. The shaft 211 is rotatably supported by a radial bearing 103 assembled to the front housing 101 a and a rear radial bearing 104 assembled to the inner housing 105. A hermetic seal 102 is assembled on the upper portion of the front housing 101a. The hermetic seal 102 is preferably an airtight terminal corresponding to the refrigerant used in the vehicle air conditioner. When electric power is supplied from an external power source (not shown) through the hermetic seal 102, the shaft 211 rotates together with the rotor 310.

  Next, the compression mechanism unit 200 will be described. An eccentric crank mechanism 210 is provided on the compression mechanism portion 200 side of the shaft 211. A counterweight 212 is rotatably attached to an eccentric crank mechanism 210 provided on the shaft 211. A radial bearing 230 is assembled to the outer periphery of the shaft portion of the counterweight 212. Therefore, the shaft 211 is connected to the orbiting scroll 240 via the counterweight 212 and the radial bearing 230.

  A fixed scroll 250 is provided on the side of the orbiting scroll 240 opposite to the electric motor. Further, between the orbiting scroll 240 and the fixed scroll 250, spiral scroll wraps provided in the respective scrolls are fitted in the longitudinal direction of the shaft 211 to form a crescent-shaped compression chamber 260. A suction chamber (not shown) is formed in the outermost peripheral portion between the orbiting scroll 240 and the fixed scroll 250.

  The front housing 101a is provided with a suction port (not shown). The refrigerant sucked from the suction port passes through a suction path (not shown) provided in the front housing 101 a and is introduced into the compression mechanism unit 200 from a suction port (not shown) provided in the inner housing 105. The refrigerant introduced into the compression mechanism 200 is sucked into the suction chamber (not shown). After sucking the refrigerant, the orbiting scroll 240 revolves as the eccentric crank mechanism 210 rotates. Among them, the sucked refrigerant moves to the compression chamber 260. Thereafter, the refrigerant compressed on the inner walls of the orbiting scroll 240 and the fixed scroll 250 is discharged into the discharge chamber 290 from the discharge passage 270 provided in the fixed scroll 250. At this time, the refrigerant moves to the discharge chamber 290 by pushing open the discharge valve 280 which is a check valve provided in the discharge passage 270.

  A lubricating oil separation chamber 400 that separates the lubricating oil from the mixed fluid of the refrigerant and the lubricating oil is provided at the end of the rear housing 101b. The lubricant separator is provided with an opening 400a that communicates with the outside of the compressor 100, a communication passage 400b that communicates with the discharge chamber 290, and an oil outlet 400c that guides the separated lubricant. With room 400. The separator pipe 410 is press-fitted into the lubricating oil separation chamber 400 from the opening 400a.

  Next, the inner surface of the lubricating oil separation chamber 400 will be described with reference to FIGS. As shown in FIGS. 2 and 3, a heat insulating member 420 made of a resin member is provided on the inner surface of the lubricating oil separation chamber 400. The heat insulating member 420 is formed in a cylindrical shape having a bottom surface. An oil drain hole 450 for assembling the oil restrictor 430 is provided on the side surface of the heat insulating member 420. Further, a communication hole 460 for communicating the communication passage 400b and the inside of the lubricating oil separation chamber 400 is provided on the side surface of the heat insulating member 420. The heat insulating member 420 is preferably a resin member having low heat conductivity such as polyphenylene sulfide and having excellent heat resistance and oil resistance. Further, the heat insulating member 420 may be attached to the inner surface of the lubricating oil separation chamber 400 in a close contact state with an adhesive or the like, or may be mechanically detachable by providing a coupling structure on both sides.

  The refrigerant discharged into the discharge chamber 290 contains lubricating oil for the purpose of lubricating the inside of the compressor 100. The refrigerant that has moved from the discharge chamber 290 into the lubricating oil separation chamber 400 through the communication passage 400b moves around the separator pipe 410 and moves downward in the lubricating oil separation chamber 400. At this time, the refrigerant and the lubricating oil are centrifuged around the separator pipe 410. The separated refrigerant is discharged from the lubricating oil separation chamber 400 through the opening 400a. Further, the separated lubricating oil travels along the inner wall surface of the heat insulating member 420 and accumulates in the lower portion of the lubricating oil separation chamber 400. The lubricating oil collected in the lower portion of the lubricating oil separation chamber 400 is adjusted in flow rate by the oil restrictor 430 and then introduced into the compressor 100 through the oil guide passage 440.

  Next, features of the present embodiment will be described. A heat insulating member 420 is provided on the inner surface of the lubricating oil separation chamber 400 provided in the compressor 100 in the present embodiment. The heat insulating member 420 can reduce the heat transferred from the compressed refrigerant and the lubricating oil contained in the refrigerant from being transferred to the rear housing 101b. Thereby, the heat transmitted from the rear housing 101b to the front housing 101a and from the front housing 101a to the suction side refrigerant can be reduced. By reducing the increase in the temperature of the suction-side refrigerant, it is possible to reduce the decrease in volumetric efficiency of the compressor 100.

  The effect of the present invention in this embodiment will be described with reference to FIG. FIG. 4 is a Mollier diagram showing a case where the compressor 100 according to this embodiment is applied to a refrigeration cycle used in a vehicle air conditioner. FIG. 4 shows a result obtained by the compressor 100 according to the present embodiment and a result obtained by removing the heat insulating member 420 from the compressor 100 according to the present embodiment.

  First, when the heat insulating member 420 is removed from the compressor 100 in the present embodiment, the following cycle is performed. Between the point Td and the point A, the condenser 500 reduces the temperature by exchanging heat with the outside air of the passenger compartment, and enters a low-temperature and high-pressure liquid phase state. Between the point A and the point B, the refrigerant is depressurized by the expansion valve 510 and enters a gas-liquid two-phase state. Between the point B and the point Ts, the evaporator 520 absorbs heat by exchanging heat with the air in the passenger compartment, and evaporates to become a gas-phase refrigerant. Between the point Ts and the point Td, the refrigerant is compressed by a compressor (not shown) to be in a high temperature and high pressure state.

  Next, when the compressor 100 in the present embodiment is used, the following cycle is performed. Between the point Td 'and the point A, the condenser 500 causes the refrigerant to exchange heat with the outside air of the passenger compartment, thereby lowering the temperature and entering a low-temperature and high-pressure liquid phase state. Between the point A and the point B, the refrigerant is depressurized by the expansion valve 510 and enters a gas-liquid two-phase state. Between the point B and the point Ts ′, the evaporator 520 absorbs heat by exchanging heat with the air in the passenger compartment, and evaporates to become a gas-phase refrigerant. Between the point Ts ′ and the point Td ′, the refrigerant is compressed by a compressor (not shown) to be in a high temperature and high pressure state.

  From the above, it can be seen that the provision of the heat insulating member 420 on the inner surface of the lubricating oil separation chamber 400 improves the point Td to the point Td ′ and the point Ts to the point Ts ′. Thereby, since the temperature rise of the suction side refrigerant | coolant is reduced, the fall of the volume efficiency of the compressor 100 can be reduced.

(Second Embodiment)
Next, features of the second embodiment of the present invention will be described with reference to FIG.

  In the first embodiment, the lubricating oil separation chamber 400 is formed in a cylindrical shape having a bottom surface, and an oil drain hole 450 and a communication hole 460 for assembling the oil throttle 430 are provided on the side surface. In the embodiment, instead of providing the communication hole 460, a U-shaped notch is provided from the opening of the heat insulating member to the surface in contact with the communication passage 400b.

  Thereby, since the temperature rise of the suction side refrigerant | coolant is reduced, the fall of the volume efficiency of the compressor 100 can be reduced. Further, the manufacturing cost can be reduced as compared with the first embodiment. Furthermore, the labor required for processing can be reduced as compared with the first embodiment.

(Third embodiment)
Next, features of the third embodiment of the present invention will be described with reference to FIG.

  In the first embodiment, the lubricating oil separation chamber 400 is formed in a cylindrical shape having a bottom surface, and an oil drain hole 450 and a communication hole 460 for assembling the oil throttle 430 are provided on the side surface. The embodiment uses a cylindrical heat insulating member whose bottom surface is not blocked.

  Thereby, since the temperature rise of the suction side refrigerant | coolant is reduced, the fall of the volume efficiency of the compressor 100 can be reduced. Further, the manufacturing cost can be reduced as compared with the first embodiment. Furthermore, the labor required for processing can be reduced as compared with the first embodiment.

(Fourth embodiment)
Next, features of the fourth embodiment of the present invention will be described with reference to FIG.

  In the first embodiment, the lubricating oil separation chamber 400 is formed in a cylindrical shape having a bottom surface, and an oil drain hole 450 and a communication hole 460 for assembling the oil throttle 430 are provided on the side surface. In the embodiment, instead of providing the communication hole 460, the upper end of the heat insulating member is cut obliquely so as not to block the communication passage 400b.

  Thereby, since the temperature rise of the suction side refrigerant | coolant is reduced, the fall of the volume efficiency of the compressor 100 can be reduced. Further, the manufacturing cost can be reduced as compared with the first embodiment. Furthermore, the labor required for processing can be reduced as compared with the first embodiment.

(Other embodiments)
In the above embodiment, the heat insulating member is provided on the inner wall surface of the lubricating oil separator, but the present invention is not limited to this, and the discharge chamber is also provided with a heat insulating member as the discharge chamber heat insulating member. It may be.

  Moreover, in the said embodiment, although polyphenylene sulfide (PPS) was used as a heat insulation member, this invention is not limited to the said embodiment, A polybutylene terephthalate (PBT), acrylonitrile butadiene styrene copolymer synthetic resin (ABS), synthetic resins such as polyimide, metal materials such as stainless steel and titanium, inorganic solid materials typified by ceramics, etc., if the material has a lower thermal conductivity than the material used for the compressor shell Anything.

  Moreover, in the said embodiment, although this invention was applied to the refrigerating cycle used for a vehicle air conditioner, this invention is not limited to the said embodiment, You may apply to the heat pump for heating. Thereby, as shown in FIG. 8, since the temperature fall of a discharge side refrigerant | coolant can be reduced, the fall of heating efficiency can be relieve | moderated.

  Moreover, in the said embodiment, although the hermetic seal 102 said that the airtight terminal corresponding to the refrigerant | coolant used for a vehicle air conditioner was good, this invention is not limited to this, It uses in another field | area. The airtight terminal may be secured by impregnating a resin or the like with the airtight terminal or the front housing 101a.

  The present invention is not limited to the above-described embodiment, and may be implemented in any form as long as it does not depart from the invention described in the claims.

DESCRIPTION OF SYMBOLS 100 Compressor 101 Housing 200 Compression mechanism 211 Shaft 240 Orbiting scroll 250 Fixed scroll 270 Discharge passage 290 Discharge chamber 300 Motor portion 400 Lubricating oil separation chamber 400a Opening portion 400b Communication passage 400c Oil outlet port 410 Centrifugal oil separator 420 Thermal insulation member 430 Oil throttle 440 Oil guide passage 450 Oil drain hole 460 Communication hole

Claims (5)

A housing (101) constituting an outer shell of the compressor (100);
A suction port provided in the housing (101);
A compression mechanism (200) provided in the housing (101) for compressing the refrigerant;
A suction path for guiding the refrigerant sucked from the suction port to the compression mechanism (200);
A discharge chamber (290) provided in the housing (101) and into which the refrigerant compressed by the compression mechanism (200) is discharged;
Lubricating oil is mixed in the refrigerant,
The housing (101) includes a lubricant separator that separates the lubricant from a mixed fluid of the refrigerant and the lubricant,
The lubricating oil separator comprises a lubricating oil separating chamber (400) that forms a cylindrical space communicating with the discharge chamber (290),
A separator pipe (410) disposed inside the lubricating oil separation chamber (400),
A compressor comprising a heat insulating member (420) on an inner wall surface of the lubricating oil separation chamber (400).   The compressor according to claim 1, wherein the heat insulating member (420) is provided in close contact with an inner wall surface of the lubricating oil separation chamber (400).   The compressor according to claim 1, wherein the heat insulating member (420) is mechanically fixed to an inner wall surface of the lubricating oil separation chamber (400).   The compressor according to any one of claims 1 to 3, wherein a discharge chamber heat insulating member is provided on at least one of an inner wall surface and an outer wall surface of the discharge chamber (290).   The compressor according to any one of claims 1 to 4, further comprising a scroll type compression mechanism (240, 250) as the compression mechanism.

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