WO2006129617A1

WO2006129617A1 - Scroll compressor

Info

Publication number: WO2006129617A1
Application number: PCT/JP2006/310694
Authority: WO
Inventors: Yukihiro Fujiwara; Masahiko Makino; Nobuaki Ogawa
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2005-05-30
Filing date: 2006-05-29
Publication date: 2006-12-07
Also published as: JP2006329141A

Abstract

A compressor using a compact liquid separation device that reduces the oil circulation ratio of the compressor and reduces the size and weight of the compressor. A liquid separation wall (19) for covering a main bearing (42) is provided at a rear end (51a) of a main bearing member (51). As a result, lubrication oil (7) fed to the main bearing (42) of a compression mechanism (4) is separated from compression gas by an effect of impingement of the oil to the liquid separation wall (19). The lubrication oil (7) after the separation is recovered into an oil containing section (6) without being stirred by rotation of a balance weight (5c) or flowing into a discharge opening (9). Thus the liquid separation device is compacter.

Description

Specification

Scroll compressor

Technical field

[0001] The present invention relates to a lubrication mechanism that lubricates a sliding mechanism including a compression mechanism section that sucks, compresses and discharges refrigerant, a motor that drives the compression mechanism section, and a compression mechanism section. The present invention relates to a liquid separator for a scroll compressor having an oil storage section for storing oil.

Background art

Conventionally, in this type of compressor, the container is hermetically sealed when connected to the refrigeration cycle. When the compression mechanism is driven, the refrigerant in the refrigeration cycle is sucked through the suction port of the container. After the suction refrigerant is compressed and discharged into the container, it is repeatedly supplied from the container outlet to the refrigeration cycle. 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 so that the sliding part is lubricated. By such a lubrication mechanism, the refrigerant discharged from the compressor mechanism and supplied to the refrigeration cycle contains lubricating oil. Lubricating oil contained in this cooling medium causes performance degradation in the refrigeration cycle. At the same time, if a large amount of lubricating oil circulates in the refrigeration cycle, the lubrication of the sliding parts in the container will be insufficient. Weigh.

[0003] Therefore, as a conventional technique, there is a liquid separator as shown in an enlarged cross-sectional view of a main part of the conventional electric compressor in FIG. In FIG. 4, the refrigerant containing the lubricating oil discharged from the bearing 102 of the compression mechanism 101 is separated into the compressed gas and the lubricating oil by the cylindrical cover 104 for preventing the scattering of the lubricating oil attached to the main bearing member 103. In addition, there is a technique for reducing the amount of lubricating oil discharged to the refrigeration cycle (for example, see Patent Document 1).

Patent Document 1: JP-A-11 182471

Disclosure of the invention

Problems to be solved by the invention

[0004] By the way, the electric compressor incorporated in the container as described above has been installed for cooling and heating of automobiles, and is also used in some electric compressors for room air conditioners. Meanwhile, ring Amidst growing borders and energy problems, there is a need for lighter vehicles. In particular, the weight of the vehicle is the most important issue in order to obtain the driving power at the level of a gasoline-powered vehicle during electric driving in an electric vehicle or hybrid vehicle. Therefore, a compressor that is relatively heavy and an electric compressor that incorporates an electric motor that is large and heavy, especially when mounted on a vehicle, is as small and lightweight as a vehicle.匕 is an important issue.

However, since the cylindrical cover structure is complicated, the prevention of splashing of the lubricating oil by the cylindrical cover employed in the conventional electric compressor is difficult. Directional space is increased. As a result, there is a problem of hindering miniaturization and light weight. Furthermore, there is a problem that the cost increases due to an increase in the number of parts by fixing the cylindrical cover.

[0006] Accordingly, the present invention solves the above-described conventional problems, and can separate the lubricating oil in a small space, can reduce the amount of the lubricating oil discharged to the outside of the compressor force, and can be downsized. An object of the present invention is to provide a scroll compressor that is lightweight.

Means for solving the problem

[0007] A scroll compressor according to the first aspect of the present invention includes, in a container, a compression mechanism section that performs suction, compression, and discharge of refrigerant, and a motor that drives the compression mechanism section, and the compression mechanism section includes: A main bearing member having a main bearing for supporting the drive shaft of the motor while sandwiching the orbiting scroll between the orbiting scroll driven by the motor, the fixed scroll combined with the orbiting scroll, and the fixed scroll A liquid separation wall that covers the main bearing at a rear end of the main bearing member in an electric compressor in which lubricating oil for lubricating the sliding portion including the compression mechanism portion is supplied to the main bearing. It is characterized by providing.

[0008] A second aspect of the present invention is the scroll compressor according to the first aspect of the present invention, wherein a groove is provided at a rear end of the main bearing member, and the liquid separation wall is in contact with the rear end of the main bearing member. It is characterized by this.

[0009] A third aspect of the present invention is characterized in that, in the scroll compressor according to the first aspect of the present invention, the liquid separation wall is formed integrally with the drive shaft.

The invention's effect In the scroll compressor of the present invention, the lubricating oil can be separated in a small space, and the amount of the lubricating oil discharged to the outside can also be reduced by the scroll type compressor force. In addition, since the number of words can be reduced, the size and weight can be reduced.

Brief Description of Drawings

FIG. 1 is a cross-sectional view of a scroll compressor according to a first embodiment of the present invention.

[Figure 2] Enlarged view of the main part of Figure 1

FIG. 3 is a sectional view of a scroll compressor according to a second embodiment of the present invention.

[Figure 4] Enlarged sectional view of the main part of a conventional electric compressor

Explanation of symbols

1 Scroll compressor

3 Body casing

4 Compression mechanism

5 Motor

6 Oil storage section

7 Lubricating oil

10 Compression space

11 Fixed scroll

12 swivel scroll

12a Orbiting scroll panel

14 Drive shaft

14b

15 Oil passage

19 Liquid separation wall

42 Main bearing

51 Main bearing member

51a rear end

80 Sub casing

BEST MODE FOR CARRYING OUT THE INVENTION [0013] The scroll compressor according to the first embodiment of the present invention is provided with a liquid separation wall covering the main bearing at the rear end of the main bearing member.

According to the present embodiment, the liquid separation wall converts the refrigerant containing the lubricating oil discharged into the container from the main bearing of the compression mechanism section into the lubricating oil and the compressed gas by the collision action on the liquid separation wall. Since the separation is performed, a compact liquid separation apparatus can be obtained.

[0014] A second embodiment of the present invention is the scroll compressor according to the first embodiment, wherein a groove is provided at the rear end of the main bearing member, and a liquid separation wall is formed at the rear end of the main bearing member. It is in contact.

According to the present embodiment, the lubricating oil separated from the compressed gas can be guided to the oil storage section through the groove provided at the rear end.

[0015] A third embodiment of the present invention is a scroll compressor according to the first embodiment, in which a liquid separation wall is formed integrally with a drive shaft.

According to the present embodiment, the lubricating oil and the compressed gas are separated by the liquid separation wall, and the number of parts is reduced, so that the liquid separation device can be further reduced in size and weight.

Example 1

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. Note that the present invention is not limited to the embodiments.

FIG. 1 is a cross-sectional view of a scroll compressor according to a first embodiment of the present invention, and FIG. 2 is an enlarged view of a main part of FIG.

FIG. 1 shows an example of a horizontal scroll compressor installed sideways by a mounting leg 2 around the trunk of the scroll compressor 1 in the scroll compressor of the present embodiment.

That is, the scroll compressor 1 incorporates a compression mechanism section 4 and a motor 5 for driving the compression mechanism section 4 in a container composed of a main casing 3 and a sub casing 80, and includes a sliding mechanism including the compression mechanism section 4. An oil storage unit 6 for storing lubricating oil 7 used for lubricating the moving unit is provided, and the motor 5 is configured to be driven by a motor drive circuit unit (not shown).

The working fluid to be handled is a refrigerant, and the lubricating oil 7 used to lubricate each sliding portion and seal the sliding portion of the compression mechanism portion 4 has compatibility with the refrigerant. Basically, a compression mechanism section 4 for sucking, compressing and discharging refrigerant, a motor 5 for driving the compression mechanism section 4, and a lubricating oil 7 for lubricating each sliding section including the compression mechanism section 4 are provided. The following description should limit the description of the claims as long as it is a scroll compressor in which the oil storage section 6 for storing is built in the main body casing 3 and the like and the motor 5 is driven by the motor drive circuit section. is not.

Furthermore, a pump 13, a secondary bearing 41, a motor 5, and a main bearing member 51 having a main bearing 42 are disposed in the main body casing 3 from the one end wall 3 a side in the axial direction. ing.

The pump 13 also holds the outer surface force of the end wall 3a and is held between the lid body 52 fitted thereafter. A pump chamber 53 is formed inside the lid body 52 so that the pump chamber 53 communicates with the oil storage section 6 through the suction passage 54. The auxiliary bearing 41 is held by the end wall 3a and pivotally supports the pump 13 side of the drive shaft 14. The motor 5 includes a stator 5a fixed to the inner periphery of the main casing 3 by shrink fitting or the like, and a rotor 5b fixed to the drive shaft 14, and rotates the drive shaft 14.

The main bearing member 51 is fixed to the inner periphery of the sub casing 80 with a bolt 56 or the like, and has a main bearing 42. The main bearing 42 pivotally supports the compression mechanism portion 4 side of the drive shaft 14. A fixed scroll 11 is attached to the outer surface of the main bearing member 51 with bolts (not shown) or the like, and the orbiting scroll 12 is sandwiched between the main bearing member 51 and the fixed scroll 11 to constitute the scroll compressor 1. is doing. An Oldham ring 57 is provided between the main bearing member 51 and the orbiting scroll 12 to prevent the orbiting scroll 12 from rotating and to orbit.

[0020] An eccentric shaft 14a is formed on the side of the compression mechanism portion 4 of the drive shaft 14, and a bush 30 is fitted to the eccentric shaft 14a. The bush 30 enables orbiting motion of the orbiting scroll 12 facing the fixed scroll 11 via the eccentric bearing 43. Further, a cylindrical portion 12b is projected from the rear surface of the orbiting scroll end plate 12a of the orbiting scroll 12, and an 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 part 12b.

[0021] The exposed portion of the compression mechanism section 4 from the sub casing 80 is brought into contact with the openings of the sub casing 80 and the main body casing 3, and fixed by bolts 18 to each other. Covered by body casing 3. At this time, the end wall 3a is formed on the opposite side of the end wall 80a in the axial direction. Further, the compression mechanism 4 is located between the suction port 8 provided in the sub casing 80 and the discharge port 9 provided in the main casing 3.

A suction hole 16 provided in the fixed scroll 11 of the compression mechanism unit 4 communicates with the suction port 8 of the sub casing 80. Further, the discharge hole 31 of the fixed scroll 11 communicates with the discharge chamber 62 on the end wall 80a side through the reed valve 31a. The discharge chamber 62 is connected between the compression mechanism 4 and the end wall 3a through a communication passage 63 formed between the fixed scroll 11 and the sub casing 80 or between the main bearing member 51 and the main body casing 3. In the meantime, it passes through the body casing 3 on the motor 5 side having the discharge port 9.

Then, in the scroll compressor 1 of the present embodiment, as shown in FIG. 2, the liquid separation wall 19 that covers the main bearing 42 is provided at the rear end 51a of the main bearing member 51 on the motor 5 side. It is said.

Next, the operation of the scroll compressor will be described.

In the compression mechanism section 4 of the scroll compressor 1 of this embodiment, when the orbiting scroll 12 is caused to orbit with respect to the fixed scroll 11 by the motor 5 via the drive shaft 14, as shown in FIG. A compression space 10 formed by combining the scroll 11 and the orbiting scroll 12 moves while changing its volume. Due to this volume change, the suction and compression of the refrigerant returning from the external cycle and the discharge force to the external cycle are performed through the suction port 8 of the sub casing 80 and the discharge port 9 of the main body casing 3.

That is, the motor 5 is driven by the motor drive circuit unit, and rotates the compression mechanism unit 4 via the drive shaft 14 and drives the pump 13. 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. The air is sucked into the air and compressed, and discharged from the discharge hole 31 to the discharge chamber 62.

Then, the refrigerant discharged into the discharge chamber 62 enters the main body casing 3 on the motor 5 side through the communication passage 63 and is discharged from the discharge port 9 of the main body casing 3 while cooling the motor 5. In this process, the lubricating oil 7 is separated by the gas-liquid separation action such as the collision of the refrigerant and the throttle, and the auxiliary bearing 41 is lubricated by the partial lubricating oil 7 accompanying the refrigerant.

At the same time, the lubricating oil 7 stored in the oil storage section 6 of the main casing 3 is supplied to the drive shaft 14. Then, the positive displacement pump 13 is driven and supplied to the liquid reservoir 21 on the rear surface of the orbiting scroll 12 through the oil supply passage 15 of the drive shaft 14. It is also possible to supply the lubricating oil 7 to the liquid reservoir 21 using the differential pressure in the main casing 3.

A part of the lubricating oil 7 supplied to the liquid reservoir 21 passes through the rear surface of the orbiting scroll end plate 12a and is supplied to the rear side of the outer peripheral portion of the orbiting scroll 12 based on a predetermined pressure restriction by the throttle 23 or the like. The Then, the orbiting scroll 12 is backed up.

Further, the lubricant 7 is supplied to the tip of the spiral scroll of the orbiting scroll 12 through the orbiting scroll 12. That is, the lubricating oil 7 is supplied to the holding groove 25 that holds the tip seal 24 that seals between the fixed scroll 11 and the orbiting scroll 12, and sealing and lubrication between the fixed scroll 11 and the orbiting scroll 12 are achieved.

Further, another part of the lubricating oil 7 supplied to the liquid reservoir 21 is supplied to the main bearing 42 through the eccentric bearing 43 and the liquid reservoir 22. After the eccentric bearing 43 and the main bearing 42 are lubricated, they are discharged from the main bearing 42 held by the main bearing member 51 into the main casing 3 and collide with the liquid separation wall 19. By this collision, the compressed gas and the lubricating oil 7 are separated at the liquid separation wall 19, the compressed gas flows out to the motor 5 side, and the lubricating oil 7 travels through the groove 17 provided at the rear end 51 a of the main bearing member 51. And collected into the oil storage section 6.

[0027] By the scroll compressor of the present embodiment having the above-described configuration, the refrigerant force including the lubricating oil 7 discharged from the main bearing member 51 of the compression mechanism section 4 into the main body casing 3 is immediately after the liquid separation wall. It is separated into lubricating oil 7 and compressed gas by the collision action on 19. Then, the separated lubricating oil 7 falls along the groove 17 provided in the rear end 51 a of the main bearing member 51 and is collected in the oil storage section 6. At this time, the lubricating oil 7 is recovered without being agitated or flowing into the discharge port 9 by the rotation of the balance weight 5c provided in the rotor 5b.

By this action, the lubricating oil can be separated in a small space, and the amount of lubricating oil discharged from the scroll compressor to the outside can be reduced. In addition, since the number of parts can be reduced, the size and weight can be reduced.

Example 2

FIG. 3 is a cross-sectional view of the scroll compressor according to the second embodiment of the present invention.

In the present embodiment, the liquid separation wall is arranged so that the flange 14b of the drive shaft 14 covers the main bearing 42 in the normal direction. It extends in the direction and is formed integrally with the drive shaft 14.

That is, the refrigerant containing the lubricating oil 7 discharged from the main bearing 42 into the main casing 3 is made to collide with the liquid separation wall formed by expanding the nozzle 14b in the normal direction. .

With this configuration, the refrigerant 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 the centrifugal force and stirred by the rotation of the non-weight 5c. Or collected into the oil storage section 6 where it does not flow into the discharge port 9.

[0029] Thus, in the scroll compressor of the present embodiment, the flange 14b as the liquid separation wall is integrated with the drive shaft 14, so that the lubricating oil contained in the refrigerant can be separated and the number of parts that are further smoothed. Reduction, downsizing, and light weight.

Industrial applicability

[0030] As described above, in the scroll compressor according to the present invention, it is possible to improve the separation performance of the lubricating oil with a compact liquid separation device, so that the scroll compressor without a motor is also incorporated. Applicable.

Claims

The scope of the claims

[1] A container is provided with a compression mechanism section that sucks, compresses and discharges the refrigerant, and a motor that drives the compression mechanism section.

The compression mechanism is

A turning scroll driven by the motor;

A fixed scroll combined with the orbiting scroll;

A main bearing member having a main bearing that pivotally supports the drive shaft of the motor while sandwiching the orbiting scroll between the fixed scroll and the fixed scroll;

In the electric compressor in which lubricating oil for lubricating the sliding portion including the compression mechanism portion is supplied to the main bearing,

A scroll compressor comprising a liquid separation wall covering the main bearing at a rear end of the main bearing member.

2. The scroll compressor according to claim 1, wherein a groove is provided at a rear end of the main bearing member, and the liquid separation wall is in contact with the rear end of the main bearing member.

[3] The scroll compressor according to [1], wherein the liquid separation wall is formed integrally with the drive shaft.