JP2001329979A - Lubrication structure of scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To require no oil passage for carrying out a lubrication of a sealing means for partitioning a high discharge pressure area at the inside of a compressor and a low pressure area at the inside of the compressor at a surface of a rotation member. SOLUTION: In a lip seal 37 interposed between a center housing 12 and a periphery surface of a rotation shaft 14, a removal thereof from an insertion hole 121 is inhibited by a snap ring 38. A support part 122, i.e., a forming part of the insertion hole 121 for supporting the lip seal 37 is put out in a motor housing 13. An outlet 324 of a discharge passage 32 is directed to a tip end of the snap ring 38 and the support part 122.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating structure for a scroll compressor.

[0002]

2. Description of the Related Art In order to separate a mist-like lubricating oil flowing together with a refrigerant gas from a refrigerant gas to lubricate a portion of the compressor which needs lubrication, a compressor disclosed in Japanese Patent Application Laid-Open No. Hei 7-145579 has an end portion of a main shaft. A cylindrical barrier is provided. The discharge gas that has passed through the flow path in the motor unit reaches the flow path in the main shaft through the inside of the cylindrical barrier cylinder, and the lubricating oil that flows with the discharge gas is separated in the barrier cylinder that rotates with the main shaft. You.

[0003] However, such a configuration in which the oil separation barrier is provided in the compressor increases the number of parts. In the compressor disclosed in JP-A-1-170779, a discharge port is provided in a turning drive shaft and a main shaft of a movable scroll, and gas passing through the discharge port is discharged from a peripheral surface of the main shaft to an internal space on the motor side. . The mist-like lubricating oil flowing along with the refrigerant gas discharged from the peripheral surface of the main shaft to the internal space on the electric motor side is separated by centrifugal action.

[0004]

Problems to be Solved by the Invention
In the compressor of JP-A-9, no special component for separating the lubricating oil is used. The separated lubricating oil is stored at the bottom of the internal space on the motor side. Lubrication of the sealing means for separating the high-pressure discharge pressure area inside the compressor from the low-pressure pressure area inside the compressor by the surface of the rotating member is important for improving the durability of the sealing means. However, in order to lubricate the sealing means with the lubricating oil stored at the bottom of the internal space on the motor side, it is necessary to provide an oil passage from the oil storage section at the bottom to the installation location of the sealing means.
The use of such an oil passage requires an operation process for forming the oil passage, and increases the manufacturing cost of the compressor.

The present invention eliminates the need for an oil passage for lubricating sealing means for separating a high-pressure discharge pressure region inside a compressor from a low-pressure pressure region inside the compressor on the surface of a rotating member. Aim.

[0006]

For this purpose, the present invention provides a fixed scroll having a fixed scroll wall formed on a fixed scroll substrate, and a movable scroll having a movable scroll wall formed on a movable scroll substrate. A closed space whose volume is reduced based on the revolution of the movable scroll is formed between the movable scroll wall on the movable scroll side that revolves non-rotatably and the fixed spiral wall, and a revolving mechanism for revolving the movable scroll. The present invention is directed to a scroll-type compressor that transmits the rotational force of a rotating shaft to revolve the orbiting scroll, and in the invention of claim 1, a discharge pressure region inside the compressor and another pressure region inside the compressor. A sealing unit separating at the surface of the rotating member, and a discharge passage provided inside the rotating member, forming another lubricating structure, a supporting portion for supporting the sealing unit, and Serial and the outlet of the discharge passage to at least one of the sealing means is directed.

The gas flowing through the discharge passage collides with at least one of the support and the seal of the sealing means, and the lubricating oil flowing with the gas separates from the gas when at least one of the support and the seal collides with the gas. Is done. The separated lubricating oil is used for lubricating the sealing means.

[0008] In the invention of claim 2, in claim 1,
The rotating member is the rotating shaft, and the sealing means is a lip seal. Gas flowing through the discharge passage in the rotating shaft is
It flows out of the discharge passage so as to collide with at least one of the support portion and the sealing means. The lubricating oil separated from the gas colliding with at least one of the lip seal support and the lip seal is used for lubrication of the lip seal.

According to a third aspect of the present invention, in the second aspect,
The outlet of the discharge passage is opened to the peripheral surface of the rotating shaft. The gas flowing through the discharge passage in the rotating shaft flows out from the peripheral surface of the rotating shaft so as to collide with at least one of the support portion and the sealing means. The configuration in which gas flows out from the peripheral surface of the rotating shaft assists oil separation by the action of centrifugal force.

According to a fourth aspect of the present invention, in the second aspect,
The revolving mechanism includes an eccentric shaft that rotates integrally with the rotating shaft, and an eccentric rotation transmitting unit that is interposed between the eccentric shaft and the orbiting scroll and transmits eccentric rotation of the eccentric shaft to the orbiting scroll. The discharge passage is provided so as to be continuous with the eccentric shaft and the rotation shaft.

The gas flowing through the discharge passage inside the eccentric shaft and the rotary shaft flows out of the discharge passage so as to collide with at least one of the support and the sealing means.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1A, a center housing 12 is joined to the fixed scroll 11, and a motor housing 13 is joined to the center housing 12. A rotating shaft 14 is provided between the center housing 12 and the motor housing 13 by radial bearings 15,1.
6 rotatably supported. The rotating shaft 14 penetrates the center housing 12, and the radial bearing 15 is inserted into an insertion hole 121 for inserting the rotating shaft 14.

An eccentric shaft 17 is formed integrally with the rotating shaft 14. A bush 19 is fitted to the eccentric shaft 17, and a balance weight 18 is fixed to the bush 19. The bush 19 has a needle bearing 21 so that the movable scroll 20 faces the fixed scroll 11.
Are supported so as to be relatively rotatable. The needle bearing 21 is housed in a cylindrical portion 34 protruding from the back surface of the movable scroll substrate 22 of the movable scroll 20.

The fixed scroll substrate 23 and the fixed spiral wall 24 of the fixed scroll 11, and the movable scroll substrate 22 and the movable spiral wall 25 of the movable scroll 20, form closed spaces So and S1, as shown in FIG. Movable scroll 2
0 revolves with the rotation of the eccentric shaft 17, and the balance weight 18 cancels the centrifugal force caused by the revolving motion of the orbiting scroll 20. An eccentric shaft 17, which rotates integrally with the rotating shaft 14,
The bush 19, the cylindrical portion 34, and the needle bearing 21 interposed between the eccentric shaft 17 and the cylindrical portion 34 of the movable scroll 20 constitute a revolving mechanism. The cylindrical portion 34, the needle bearing 21 and the bush 19 constitute an eccentric rotation transmitting means for transmitting the eccentric rotation of the eccentric shaft 17 to the movable scroll 20.

As shown in FIG. 1A, a turning ring 26 is interposed between the movable scroll board 22 and the center housing 12. A plurality of (four in the present embodiment) rotation prevention pins 27 having a cylindrical shape are provided on the revolving ring 26.
Are fixed through. An annular pressure receiving plate 28 is interposed between the center housing 12 and the turning ring 26. As shown in FIG. 3, the pressure receiving plate 28 is provided with the same number of rotation preventing holes 281 as the rotation preventing pins 27 in the circumferential direction. The same number of rotation prevention holes 222 as the rotation prevention pins 27 are arranged in the movable scroll board 22 in the circumferential direction. Both the rotation preventing holes 281 and 222 are arranged at equally spaced angular positions. The ends of the rotation preventing pins 27 are inserted into the rotation preventing holes 281 and 222.

As shown in FIG. 1A, a stator 29 is fixed to the inner peripheral surface of the motor housing 13, and a rotor 30 is supported on the rotating shaft 14. Stator 2
The motor 9 and the rotor 30 constitute a motor, and the rotor 30 and the rotating shaft 14 rotate integrally by energizing the stator 29.

With the rotation of the eccentric shaft 17 formed integrally with the rotary shaft 14, the orbiting scroll 20 revolves and the entrance 111
The refrigerant gas introduced from above flows into the space between the fixed scroll substrate 23 and the movable scroll substrate 22 from the peripheral sides of the scrolls 11 and 20. With the revolution of the movable scroll 20, the peripheral surface of the rotation preventing pin 27 becomes the rotation preventing holes 222 and 28.
The sliding contact is made along the peripheral surface of No. 1. Anti-rotation holes 222, 281
, The diameter d of the rotation preventing pin 27, and the revolution radius r of the bush 19, a relationship of D = d + r is set.
With this relationship, the orbital radius of the orbiting scroll 20 is defined as r, and the orbiting ring 26 orbits at a radius of の of the orbital radius r of the orbiting scroll 20.

The turning ring 26 tends to rotate. However, since three or more rotation prevention pins 27 are in contact with the inner peripheral surface of the rotation prevention hole 281 in which the rotation ring 2 is fixed,
6 does not spin. The orbiting scroll 20 tends to rotate around the central axis of the bush 19. But,
Since the inner peripheral surface of the rotation preventing hole 222 on the movable scroll substrate 22 is in contact with the three or more rotation preventing pins 27 on the orbiting ring 26 which does not rotate, the movable scroll 20 rotates around the central axis of the bush 19. Never. That is,
The movable scroll 20 and the orbiting ring 26 revolve without rotating. The closed spaces S1, So shown in FIG. 2 decrease in volume as the orbiting scroll 20 revolves, and the inner end portions 241, 25 of the spiral walls 24, 25 of both scrolls 11, 20.
Converge toward 251.

As shown in FIG. 1A, a discharge port 221 is formed in the movable scroll substrate 22. The discharge port 221 communicates with the final sealed space So. The discharge port 221 is opened and closed by the float valve 31.
A discharge passage 32 is formed in the eccentric shaft 17 and the rotating shaft 14. The discharge passage 32 includes an axial passage 321 parallel to the axis 142 of the rotating shaft 14 and a radial passage 322 orthogonal to the axis 142.

A seal member 35 is interposed between the end face of the cylindrical portion 34 and the balance weight 18. The seal member 35 defines a back pressure chamber 36 in the cylindrical portion 34 together with the movable scroll substrate 22 and the balance weight 18. An inlet 323 of the discharge passage 32 opens to the back pressure chamber 36, and an outlet 324 of the discharge passage 32 opens to the peripheral surface of the rotating shaft 14.

As shown in FIG. 1B, the lip seal 37 is fitted in the insertion hole 121. A lip seal 37 interposed between the center housing 12 and the peripheral surface of the rotating shaft 14 as a rotating member is adjacent to the radial bearing 15. The lip seal 37 is prevented from falling out of the insertion hole 121 by the circlip 38. A support portion 122 that forms the insertion hole 121 and supports the lip seal 37 projects into the motor housing 13.

The outlet 324 of the discharge passage 32 is directed toward the tip of the circlip 38 and the support portion 122. That is, a part of the outlet 324 overlaps the tip of the circlip 38 and the support portion 122 when viewed in the length direction of the radial passage 322.

The refrigerant gas compressed due to the reduced volume of the sealed spaces S1 and So is discharged from the final sealed space So into the motor housing 13 through the discharge port 221, the back pressure chamber 36 and the discharge passage 32. Motor housing 13
The refrigerant gas inside flows out to the external refrigerant circuit 33 via the passage 141 in the rotating shaft 14 and the outlet 131 on the end wall of the motor housing 13.

The inside of the back pressure chamber 36 in the cylindrical portion 34 is a high-pressure discharge pressure region, and the motor housing 13 is a high-pressure discharge pressure region Pd. Movable scroll board 2 outside cylindrical section 34
The rear side of 2 is a low-pressure suction pressure region Ps. The seal member 35 prevents pressure leakage between the suction pressure region Ps on the back side of the movable scroll substrate 22 and the back pressure chamber 36.
The lip seal 37 prevents pressure leakage from the discharge pressure area Pd in the motor housing 13 to the suction pressure area Ps on the back side of the movable scroll board 22 along the peripheral surface of the rotary shaft 14.

In the first embodiment, the following effects can be obtained. (1-1) Part of the refrigerant gas flowing from the outlet 324 of the discharge passage 32 into the motor housing 13 collides with the support portion 122 and the circlip 38. The mist-like lubricating oil flowing together with the refrigerant gas is separated by the collision of the refrigerant gas with the support portion 122 and the circlip 38. Some of the separated lubricating oil lubricates the nearby lip seal 37. Therefore, a dedicated oil passage for lubricating the lip seal 37 becomes unnecessary.

(1-2) When the outlet 324 and the lip seal 37 are overlapped, the lip seal 37 is significantly worn. Therefore, the outlet 324 of the discharge passage 32 and the lip seal 37 are shifted so as not to overlap. However, the refrigerant gas ejected from the outlet 324 diffuses. Therefore, part of the refrigerant gas ejected from the outlet 324 is
7, and the lubricating oil separated by this collision immediately lubricates the lip seal 37.

(1-3) The refrigerant gas in the discharge passage 32 flows out from the peripheral surface of the rotating shaft 14. The configuration in which the refrigerant gas flows out from the peripheral surface of the rotating rotating shaft 14 assists oil separation by the action of centrifugal force.

Next, a second embodiment shown in FIG. 4 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. The outlet 32 as viewed in the length direction of the radial passage 322
4 overlap the tip of the support portion 122A. Therefore,
All of the refrigerant gas flowing out of the outlet 324 is
Collide with A. A configuration in which all the refrigerant gas that has exited the outlet 324 immediately collides with the support portion 122A is advantageous in increasing the efficiency of oil separation.

Next, a third embodiment shown in FIG. 5 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. The positions of the radial bearing 15 and the lip seal 37 are switched as compared with the case of the first embodiment, and the outlet 324 of the discharge passage 32 is connected to the rotary shaft 14 between the radial bearing 15 and the lip seal 37. It is open on the peripheral surface. When viewed in the length direction of the radial passage 322, the entire outlet 324 overlaps the support portion 122B.

In the third embodiment, the same effects as in the second embodiment can be obtained. Further, the refrigerant gas flowing out of the outlet 324 passes between the inner ring 151 and the outer ring 152 of the radial bearing 15, so that the radial bearing 15 is ideally lubricated.

In the present invention, the discharge passage 32 in the rotary shaft 14
May be directed to the lip seal 37. The invention other than the claims that can be grasped from the above-described embodiment will be described below. (1) A discharge port is provided on the movable scroll substrate, a back pressure chamber is provided on the back side of the movable scroll substrate, and the discharge port is open to the back pressure chamber. The lubricating structure of a scroll compressor according to any one of claims 1 to 4, wherein an inlet of the passage is open to the back pressure chamber.

The rationality that the back pressure chamber corresponding to the discharge pressure also functions as a part of the discharge passage can be obtained.

[0034]

As described above in detail, in the present invention, the outlet of the discharge passage in the rotating member is directed to at least one of the support portion of the seal means and the seal means, so that the high discharge pressure region inside the compressor is provided. In addition, there is an excellent effect that an oil passage for lubricating the sealing means for separating the low pressure region inside the compressor from the surface of the rotating member is not required.

[Brief description of the drawings]

FIG. 1 shows a first embodiment, in which (a) is a side sectional view of the entire compressor. (B) is a principal part enlarged side sectional view.

FIG. 2 is a sectional view taken along line BB of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is an enlarged side sectional view of a main part showing a second embodiment.

FIG. 5 is an enlarged side sectional view of a main part showing a third embodiment.

[Description of Signs] 11: Fixed scroll. 122, 122A, 122B ...
Support. 14 ... Rotating shaft that becomes a rotating member. 17: Eccentric shaft constituting a revolution mechanism. 20: movable scroll. 32 ... Discharge passage. 324 ... Exit. 37: Lip seal as sealing means.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuo Kobayashi 2-1-1 Toyota-cho, Kariya-shi, Aichi F-term in Toyota Industries Corporation (reference) 3H029 AA02 AA13 AB03 BB01 CC16 CC19 CC25 CC44 3H039 AA05 AA12 BB07 BB11 BB16 CC12 CC29 CC31

Claims (4)

[Claims] 1. A fixed scroll having a fixed scroll wall formed on a fixed scroll substrate and a movable scroll having a movable scroll wall formed on a movable scroll substrate are opposed to each other. A closed space is formed between the movable scroll wall and the fixed scroll wall to reduce the volume based on the revolution of the movable scroll, and the rotating force of a rotating shaft is transmitted to a revolving mechanism for revolving the movable scroll to rotate the movable scroll. A scroll compressor that revolves a scroll, wherein a seal means that separates a discharge pressure region inside the compressor and another pressure region inside the compressor by a surface of the rotating member, and is provided inside the rotating member. A scroll type, comprising: a discharge passage; and a support portion for supporting the sealing means and at least one of the sealing means, wherein an outlet of the discharge passage is directed. Lubrication structure in the compressor. 2. The lubricating structure according to claim 1, wherein said rotating member is said rotating shaft, and said sealing means is a lip seal. 3. The lubricating structure according to claim 2, wherein an outlet of the discharge passage is opened on a peripheral surface of the rotating shaft. 4. An eccentric shaft rotating integrally with the rotary shaft, and an eccentric shaft interposed between the eccentric shaft and the movable scroll for transmitting eccentric rotation of the eccentric shaft to the movable scroll. The lubricating structure according to claim 2, further comprising a rotation transmitting unit, wherein the discharge passage extends through the eccentric shaft and the rotation shaft.