JP2006329141A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an oil circulation rate of a compressor, miniaturize it, and reduce its weight by a compact liquid separation device. <P>SOLUTION: The lubricating oil 7 supplied from a main bearing 42 in a compression mechanism part is separated by collision action of compressed gas containing the lubricating oil 7 against a liquid separation wall 19 by providing the liquid separation wall 19 for preventing diffusion of the lubricating oil 7 at a rear end of a main bearing member 51 or at a collar 14b of a driving shaft 14, and the separated lubricating oil 7 is stirred by rotation of a balance weight 5c and is recovered into an oil storage part 6 without flowing into a discharge port to improve separation performance for separating compressed gas from the lubricating oil, reduce oil circulation rate of the compressor, miniaturize it, and reduce its weight. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention stores in a container a compression mechanism portion that sucks, compresses and discharges refrigerant, a motor that drives the compression mechanism portion, and lubricating oil that is used to lubricate a sliding portion including the compression mechanism portion. The present invention relates to a liquid separator for a scroll compressor having an oil storage section.

  Conventionally, this type of compressor is hermetically sealed when the container is connected to a refrigeration cycle. When the compression mechanism unit is driven, the refrigerant in the refrigeration cycle is sucked through the suction port of the container, compressed and discharged into the container, and then supplied to the refrigeration cycle from the discharge port of the container. At the same time, the lubricating oil stored in the storage part in the container is supplied directly to the sliding part including the compression mechanism part and carried by the refrigerant to lubricate the sliding part. Lubricating oil is contained in the refrigerant discharged from the compression mechanism by such a lubricating mechanism and supplied to the refrigeration cycle. Lubricating oil contained in the refrigerant supplied to the refrigeration cycle causes performance degradation in the refrigeration cycle. Also, if a large amount of lubricating oil circulates in the refrigeration cycle at the same time, the lubrication of the sliding part in the container will be insufficient. To compensate for this, the oil storage part and the amount of oil injection will increase, and the compressor will become large and heavy. .

Therefore, as a conventional technique, FIG. 4 shows an enlarged cross-sectional view of a main part of a compression mechanism portion of a conventional scroll compressor. In FIG. 4, lubricating oil mixed with compressed gas containing compressed oil discharged from the bearing 102 of the compression mechanism 101 is compressed by a cylindrical cover 104 for preventing scattered lubricating oil attached to the main bearing member 103. There is a technique for reducing the amount of lubricating oil discharged from the compressor to the refrigeration cycle (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-182471

  By the way, the compressor built in the container as described above is mounted for air conditioning of automobiles, and some electric compressors for room air conditioners are also used. There is a demand for lighter vehicles. In particular, since the driving force at the level of a gasoline vehicle cannot be obtained during electric driving in an electric vehicle or a hybrid vehicle, weight reduction of the vehicle has become the most important issue. Therefore, compressors that are relatively heavy objects, especially electric compressors that incorporate a motor that increases in size and weight, are as important issues as mounting in a vehicle, as small and light as a vehicle. .

  However, the lubrication oil scattering prevention by the cylindrical cover adopted by the conventional compressor is complicated because the cylindrical cover structure is complicated, and the axial space occupied in the container of the compressor becomes large. And has the problem of hindering weight reduction. Furthermore, there is a problem that the cost increases due to an increase in the number of parts by fixing the cylindrical cover.

  The present invention solves the above-described conventional problems, and can separate the lubricating oil in a small space, reduce the amount of the lubricating oil discharged to the outside from the scroll compressor, and can be reduced in size and weight. It aims at providing the compressor which can plan.

In order to solve the above-described conventional problems, a compressor according to the present invention includes, in a container, a compression mechanism unit that sucks, compresses, and discharges refrigerant, and a motor that drives the compression mechanism unit. An orbiting scroll driven by a motor, a fixed scroll combined with the orbiting scroll, and a main bearing member having a main bearing that supports the drive shaft constituting the motor while being combined with the fixed scroll across the orbiting scroll. In the electric compressor in which lubricating oil for lubricating the sliding part including the compression mechanism part is supplied to the main bearing, a liquid separation wall is provided at the rear end of the main bearing member so as to cover the main bearing. is there.

  Further, the liquid separation wall is integrally formed on the drive shaft so as to cover the main bearing.

  As a result, the refrigerant containing the lubricating oil discharged into the container from the main bearing member of the compression mechanism is separated by the collision action against the liquid separation wall immediately after the discharge, and the refrigerant containing the lubricating oil is used to balance the rotor. It is possible to prevent stirring by the rotation of the weight, and the lubricating oil separated by the liquid separation wall is dropped to the lower oil storage part through the groove provided at the rear end portion of the main bearing.

  The present invention solves the above-mentioned conventional problems, and can separate the lubricating oil in a small space, reduce the amount of lubricating oil discharged from the scroll compressor to the outside, and reduce the number of parts. Therefore, an object of the present invention is to provide a compressor that can be reduced in size and weight.

  1st invention is provided with the compression mechanism part which suck | inhales, compresses, and discharges a refrigerant | coolant in a container, and the motor which drives a compression mechanism part, and the compression mechanism part is a turning scroll driven by a motor, and a turning scroll A fixed scroll combined with the rotating scroll, and a main bearing member having a main bearing that supports the drive shaft that constitutes the motor, and is combined with the fixed scroll across the orbiting scroll. In the electric compressor in which lubricating oil for lubrication or the like is supplied to the main bearing, a liquid separation wall is provided at the rear end of the main bearing member so as to cover the main bearing. Compressed gas containing lubricating oil discharged from the main bearing of the container into the container is separated by a collision action against the liquid separation wall, and is transferred to a lower oil storage part through a groove provided at the rear end of the main bearing. It is.

  In the second invention, the liquid separation wall is formed integrally with the drive shaft by extending the flange of the drive shaft in the normal direction, and the number of parts can be further reduced, and the size and weight can be reduced.

  Embodiments of the present invention will be described below with reference to FIGS. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a sectional view of a compressor in the first embodiment of the present invention.

  FIG. 1 shows one example in the case of a horizontal scroll compressor installed sideways by a mounting leg 2 around the body of the scroll compressor 1, and the scroll compressor 1 is inside the main body casing 3. 2 includes a compression mechanism section 4 and a motor 5 that drives the compression mechanism section 4, and an oil storage section 6 that stores liquid used for lubrication of each sliding section including the compression mechanism section 4. I try to drive. The refrigerant to be handled is a gas refrigerant, and a liquid such as a lubricating oil 7 is employed as a liquid to be used for lubrication of each sliding part and a seal of the sliding part of the compression mechanism part 4. The lubricating oil 7 is compatible with the refrigerant. However, the present invention is not limited to these. Basically, a compression mechanism portion 4 that sucks, compresses and discharges refrigerant, a motor 5 that drives the compression mechanism portion 4, and a lubricating oil 7 that is used for lubrication of each sliding portion including the compression mechanism portion 4 are provided. The oil storage section 6 to be stored is incorporated in the main casing 3 and the scroll compressor 1 may be used which drives the motor 5 by the motor drive circuit section. The following description does not limit the description of the scope of claims.

  The compression mechanism unit 4 of the scroll compressor 1 according to the present embodiment includes a compression space 10 formed by meshing the fixed scroll 11 and the orbiting scroll 12 as shown in FIG. The sub-casing 80 is provided with suction, compression, and discharge to the external cycle of refrigerant returning from the external cycle by changing the volume with movement when the fixed scroll 11 is swung through the sub-casing 80. This is done through the outlet 8 and the outlet 9 provided in the main casing 3.

  At the same time, the lubricating oil 7 stored in the oil storage section 6 of the main body casing 3 drives the positive displacement pump 13 or the like with the driving shaft 14 or uses the differential pressure in the main body casing 3 to drive the driving shaft. 14 is supplied to the liquid reservoir 21 and the liquid reservoir 22 on the back surface of the orbiting scroll 12 in accordance with the orbiting motion of the orbiting scroll 12 through the 14 oil supply passages 15. A part of the rotary scroll 12 is supplied to the rear side of the outer peripheral portion of the orbiting scroll 12 through the orbiting scroll end plate 12 a and supplied to a predetermined restriction base such as a diaphragm 23 to back up the orbiting scroll 12, and the lubricating oil 7 is supplied Provided to a holding groove 25 that holds a tip seal 24 that is an example of a seal member between the spiral scroll of the orbiting scroll 12 and the fixed scroll 11 at the tip. And fixed, achieve sealing and lubrication between the orbiting scroll 11. Further, another part of the lubricating oil 7 supplied to the liquid reservoir 21 is separated by the liquid separation wall 19 after lubricating the bearings 42 and 43 through the eccentric bearing 43, the liquid reservoir 22 and the main bearing 42. The compressed gas flows out to the motor 5 side, and the lubricating oil 7 is recovered to the oil storage section 6 through a groove provided at the rear end of the main bearing member 51.

  Further, a main bearing member 51 having a pump 13, a sub-bearing 41, a motor 5, and a main bearing 42 is arranged from one end wall 3 a side in the axial direction in the main body casing 3. The pump 13 is accommodated from the outer surface of the end wall 3a and is held between the lid body 52 and the pump body 53 that is fitted thereafter, and a pump chamber 53 leading to the oil storage section 6 is formed inside the lid body 52 to form a suction passage 54. It leads to the oil storage part 6 via. The auxiliary bearing 41 is supported by the end wall 3a, and the side connected to the pump 13 of the drive shaft 14 is supported. The motor 5 fixes the stator 5a to the inner periphery of the main body casing 3 by shrink fitting or the like, and the drive shaft 14 can be driven to rotate by the rotor 5b fixed around the drive shaft 14.

  The main bearing member 51 is fixed to the inner periphery of the sub casing 80 with a bolt 17 or the like, and the compression mechanism portion 4 side of the drive shaft 14 is supported by the main bearing 42. The fixed scroll 11 is attached to the outer surface of the main bearing member 51 with a bolt or the like (not shown), and the orbiting scroll 12 is sandwiched between the main bearing member 51 and the fixed scroll 11 to constitute a scroll compressor. An Oldham ring 57 is provided between the main bearing member 51 and the orbiting scroll 12 for preventing the orbiting scroll 12 from rotating and causing orbiting motion.

  An eccentric shaft 14a is integrally formed on the drive shaft 14 on the compression mechanism portion 4 side, and a bush 30 is fitted and supported on the eccentric shaft 14a. The orbiting scroll 12 is supported on the bush 30 via an eccentric bearing 43 so as to be capable of orbiting movement so as to face the fixed scroll 11. A cylindrical portion 12b projects from the rear surface of the orbiting scroll end plate 12a of the orbiting scroll 12, and the eccentric bearing 43 is accommodated in the cylindrical portion 12b. The inner ring 43a of the eccentric bearing 43 is fitted into the bush 30 and the outer ring 43b of the eccentric bearing 43 is fitted into the cylindrical portion 12b.

The exposed portion of the compression mechanism portion 4 from the sub casing 80 is covered with the main casing 3 that is fixed to the sub casing 80 with the bolts 18 with the openings facing each other, and the end wall 80a opposite to the end wall 3a in the axial direction. Is forming. The compression mechanism 4 is located between the suction port 8 of the sub casing 80 and the discharge port 9 of the main casing 3, and its own suction hole 16 is connected to the suction port 8 of the sub casing 80, and its own discharge hole 31 is formed. End wall 82a through reed valve 31a
The discharge chamber 62 is opened between the two sides. The discharge chamber 62 is a motor 5 having a discharge port 9 between the compression mechanism portion 4 and the end wall 3a through the fixed scroll 11 and the main bearing member 51 or a communication passage 63 formed between them and the main body casing 3. To the side.

  As described above, the motor 5 is driven by the motor drive circuit unit, and the compression mechanism unit 4 is turned through the drive shaft 14 and the pump 13 is driven. At this time, the compression mechanism section 4 is supplied with the lubricating oil 7 of the oil storage section 6 by the pump 13 and is subjected to lubrication and sealing action, and is then refrigerated through the suction port 8 of the subcasing 80 and the suction hole 16 provided in its fixed scroll 11. The return refrigerant from the cycle is sucked and compressed, and discharged from its discharge hole 31 to the discharge chamber 62. The refrigerant discharged into the discharge chamber 62 enters the motor 5 side through the communication passage 63, and in the process until the motor 5 is cooled and discharged from the discharge port 9 of the main body casing 3, the refrigerant is a gas-liquid such as a collision or a throttle. The auxiliary bearing 41 is also lubricated by the accompanying partial lubricating oil 7 while being separated and receiving the lubricating oil 7.

  Here, in the embodiment of the present invention, the liquid separation wall 19 is basically provided at the rear end of the main bearing member 51 on the motor 5 side as shown in FIG.

  According to the above configuration, the compressed gas containing the lubricating oil 7 is separated into the lubricating oil 7 and the compressed gas by the collision action on the liquid separation wall 19, and the separated lubricating oil 7 is the rear end portion of the main bearing 51. The oil falls down through the groove 17 provided in the cylinder 5 and is recovered to the oil storage section 6 without being stirred by the rotation of the balance weight 5c provided in the rotor 5b or flowing into the discharge port 9. As a result, the lubricating oil can be separated in a small space, the amount of the lubricating oil discharged from the scroll compressor to the outside can be reduced, and the number of parts can be reduced, thereby reducing the size and weight. be able to.

(Embodiment 2)
FIG. 3 shows a cross-sectional view of the compressor in the second embodiment of the present invention.

  In the present embodiment, the liquid separation wall is integrally formed by extending the flange 14 b of the drive shaft 14 in the normal direction so as to cover the main bearing 42. As a result, the compressed gas containing the lubricating oil 7 is separated into the lubricating oil 7 and the compressed gas by the collision action, and the separated lubricating oil 7 is shaken off by centrifugal force, and is stirred and discharged by the rotation of the balance weight 5c. The oil is collected into the oil storage unit 6 without flowing into the fuel tank 9.

  By integrating with the drive shaft 14 in this way, the number of parts can be reduced, the size can be reduced, and the weight can be reduced.

  As described above, since the scroll compressor according to the present invention can improve the separation performance of the lubricating oil with a compact liquid separation device, the scroll compressor can be applied to a scroll compressor without a built-in motor.

Sectional drawing of the scroll compressor in Embodiment 1 of this invention 1 is an enlarged view of the main part of FIG. Sectional drawing of the scroll compressor in Embodiment 2 of this invention Cross section of a conventional electric compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scroll compressor 4 Compression mechanism part 5 Motor 6 Oil storage part 7 Lubricating oil 10 Compression space 11 Fixed scroll 12 Orbiting scroll 12a Orbiting scroll end plate 14 Drive shaft 14b Head 15 Oil passage 19 Liquid separation wall 42 Main bearing 51 Main bearing member

Claims (2)

A container is provided with a compression mechanism for sucking, compressing and discharging refrigerant, and a motor for driving the compression mechanism, and the compression mechanism is combined with the orbiting scroll driven by the motor and the orbiting scroll. And a main bearing member having a main bearing that supports the drive shaft constituting the motor and is combined with the fixed scroll across the orbiting scroll, and includes a compression mechanism portion. An electric compressor in which lubricating oil is supplied to the main bearing so as to cover the main bearing, and a liquid separation wall is provided at the rear end of the main bearing member so as to cover the main bearing. . A container is provided with a compression mechanism for sucking, compressing and discharging refrigerant, and a motor for driving the compression mechanism, and the compression mechanism is combined with the orbiting scroll driven by the motor and the orbiting scroll. And a main bearing member having a main bearing that supports the drive shaft constituting the motor and is combined with the fixed scroll across the orbiting scroll, and includes a compression mechanism portion. A scroll compressor characterized in that a liquid separation wall is integrally formed on the drive shaft so as to cover the main bearing in a motor-driven compressor in which lubricating oil for lubrication is supplied to the main bearing.