JP2002180981A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To feed a sufficient quantity of lubricating oil to a sealing material for gas leakage prevention provided in a region between the high-pressure side and the low-pressure side in a scroll type compressor formed with a high- pressure region receiving high-pressure refrigerant gas delivered from a compression chamber on the rear face side of a movable scroll substrate. SOLUTION: This scroll type compressor is so formed that the high-pressure region 60 receiving the high-pressure refrigerant gas delivered from the compression chamber 32 and a medium pressure region 66 are provided on the rear face side of the movable scroll substrate 24, and the sealing material 76 sealing an interval between the medium pressure region and the low-pressure region is provided between the axial end face of the movable scroll substrate 24 and a center housing 4. This compressor is so constituted that the center housing 4 is provided with a passage 80 for feeding lubricating oil and the lubricating oil in the oil sump 48a is fed to the sealing material 76 by the pressure difference between an oil sump 48a, to which the high-pressure refrigerant is led, and the medium pressure region 66.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor, and more particularly to an oil supply technique for supplying lubricating oil to a seal member interposed between a movable scroll and a housing for preventing gas leakage.

[0002]

2. Description of the Related Art Conventionally, a scroll compressor of the type in which high-pressure refrigerant gas compressed in a compression chamber is discharged from the back side of a movable scroll is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-1682. The scroll compressor described in the above publication is
A vertical compressor in which a rotation axis is a vertical type, that is, a vertical compressor in which an electric motor as a driving source thereof is disposed above a compression mechanism including a fixed scroll and a movable scroll, and accommodates the electric motor. The lubricating oil is supplied from the oil reservoir formed in the motor chamber to the high-pressure working chamber through a passage. This high-pressure working chamber is always filled with lubricating oil supplied by gravity, so that lubricating oil can always be supplied to the seal ring.

[0003] On the other hand, the rotation axis is in a horizontal direction, that is,
In the case of a scroll type compressor in which a compression mechanism and an electric motor are arranged side by side and a compressed high-pressure refrigerant gas is discharged from a discharge port of a movable scroll, the rear side of the movable scroll substrate Is provided with a high-pressure area (discharge pressure atmosphere) for receiving a high-pressure refrigerant gas discharged from the compression chamber, and the high-pressure area is a low-pressure area (a space for accommodating the movable scroll substrate through an intermediate pressure area. ). In the case of a horizontal screed compressor having such a configuration, the lubrication method using gravity described in the above-mentioned publication cannot be adopted. For this reason,
Conventionally, lubricating oil supplied to a seal member provided between an intermediate pressure region and a low pressure region is supplied by lubricating oil contained in refrigerant gas leaking from a seal member provided between a high pressure region and an intermediate pressure region. Was dependent on.

[0004]

However, in such a system in which lubricating oil in the refrigerant gas is supplied to the seal material as described above,
It is difficult to supply a sufficient amount of lubricating oil to the sealing material. The lubricating oil supplied to the sealing material effectively acts to form an oil film on the surface (seal surface) of the sealing material and to improve the sealing performance of the refrigerant gas. Means that the sealing performance decreases.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to receive a high-pressure refrigerant gas discharged from a compression chamber on the back side of a movable scroll substrate. It is an object of the present invention to provide a scroll compressor having a high-pressure region in which a sufficient amount of lubricating oil can be supplied to a gas leakage preventing seal member provided between the high-pressure side and the low-pressure side.

In order to achieve the above object, a scroll type compressor according to the present invention has a configuration as described in each of the claims. That is, according to the first aspect of the present invention, the oil in the oil reservoir can be supplied to the sealing material through the passage by the pressure difference between the pressure in the oil reservoir and the pressure in the intermediate region. . As a result, the amount of lubricating oil supplied to the sealing member increases as compared with the related art. For this reason, the improvement of the sealing performance due to the lubricating oil flowing around the sealing surface is achieved, and the efficiency is also increased. In addition, the abrasion resistance of the sealing material is improved by positively supplying the lubricating oil. According to the lubrication method using such a pressure difference, the invention is not limited to the horizontal type, and can be applied to a vertical type in which the position of the sealing material is provided at a position higher than the oil reservoir.

In this case, a second sealing material is provided between the high-pressure area and the intermediate area, whereby the intermediate area is provided between the high-pressure area and the low-pressure area. It is preferable that the intermediate pressure region be an intermediate pressure region having an intermediate pressure with respect to the pressure. In this case, lubricating oil can be stably supplied by the pressure difference between the oil reservoir and the intermediate pressure region. In other words, the pressure in the intermediate region may be equal to the high pressure region, or higher than the low pressure region but lower than the high pressure region.

Further, as described in claim 3, the passage for supplying lubricating oil to the seal member preferably has a throttle. When such a configuration is employed, it is possible to prevent a decrease in efficiency due to a so-called gas blow-through, in which high-pressure refrigerant gas in the oil reservoir passes through the passage to the intermediate region.

It is preferable that the lubricating oil be directly supplied to the mounting groove of the sealing material. In this case, more lubricating oil can be supplied to the sealing material, and the sealing material is pressurized by the pressure of the lubricating oil supplied into the mounting groove, so that the sealing effect of the sealing surface can be further enhanced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A scroll compressor according to a first embodiment of the present invention and a method for sealing the scroll compressor will be described below with reference to FIG. The present embodiment is directed to a so-called horizontal scroll compressor in which the axis of rotation of the scroll is a horizontal axis. FIG. 1 is a vertical sectional view showing the entire scroll compressor, and FIG. A in FIG.
It is a part enlarged view. As shown, one end surface of a center housing 4 is joined to the fixed scroll 2, and the other end surface of the center housing 4 is connected to a motor housing 6.
Are joined. A drive shaft 8 disposed horizontally is rotatably supported by the center housing 4 and the motor housing 6 via radial bearings 10 and 12,
An eccentric shaft 14 is formed integrally with the drive shaft 8 at a position eccentric with respect to the drive shaft 8 on the center housing 4 side.

A bush 16 is fitted to the eccentric shaft 14 so as to rotate integrally. A balance weight 18 is provided at one end of the bush 16 so as to rotate integrally with the bush 16, and a movable scroll 20 is relatively rotated via a needle bearing 22 at the other end of the bush 16 so that the movable scroll 20 faces the fixed scroll 2. Mated as possible. The needle bearing 22 is housed in a cylindrical boss portion 24 a protruding from the back surface of the movable scroll substrate 24 of the movable scroll 20.

The fixed scroll substrate 2 of the fixed scroll 2
6, the fixed scroll wall 28, the movable scroll substrate 24 of the movable scroll 20, and the movable scroll wall 30
The movable spiral wall 30 contacts the plurality of points to form a crescent-shaped compression chamber (closed space) 32. A compression mechanism 21 is formed by the fixed scroll 2 and the movable scroll 20 described above.
Is configured. The orbiting scroll 20 orbits (orbits) with the rotation (orbits) of the eccentric shaft 14,
The balance weight 18 cancels the centrifugal force caused by the revolution of the movable scroll 20. The rotational force of the drive shaft 8 is applied to the movable scroll 20 by the eccentric shaft 14, the bush 16, which rotates integrally with the drive shaft 8, and the needle bearing 22 interposed between the eccentric shaft 14 and the boss 24 a of the movable scroll 20. An orbiting mechanism that transmits the orbital motion is configured.

On the end surface of the center housing 4, a plurality (for example, four) of recesses 34 for preventing rotation are formed at equal angular positions on the same circumferential line. A fixed pin 36 fixed to the center housing 4;
The movable pin 38 fixed to 4 is fastened while being inserted into the recess 34. The movable scroll 20 is prevented from rotating by the concave portion 34, the fixed pin 36, and the movable pin 38 with the rotation of the eccentric shaft 14. That is, the recess 34
The fixed pin 36 and the movable pin 38 constitute a rotation preventing mechanism of the movable scroll 20.

A stator 44 is fixed to the inner peripheral surface of the motor housing 6, and a rotor 45 is fixed to the drive shaft 8. An electric motor 46 is formed by the stator 44 and the rotor 45, and the rotor 45 and the drive shaft 8 rotate integrally by energizing the stator 44. That is, the electric motor 46 is provided in the sealed motor room 4 formed by the motor housing 6 and the center housing 4.
8 is housed.

As the eccentric shaft 14 of the drive shaft 8 rotates, the movable scroll 20 revolves, and the refrigerant gas introduced from the inlet 42 flows from the peripheral sides of the two scrolls 2 and 20 to the fixed scroll substrate 26 and the movable scroll substrate. 24. At this time, with the rotation of the eccentric shaft 14, the orbiting scroll 20 tries to rotate around the central axis of the bush 16, but the rotation is prevented by the above-described rotation preventing mechanism. That is, when the eccentric shaft 14 rotates, the movable scroll 20 attached to the eccentric shaft 14 via the needle bearing 22 so as to be relatively rotatable revolves around the central axis of the drive shaft 8 without rotating. As the orbiting scroll 20 revolves, the refrigerant gas introduced from the inlet 42 flows into the compression chamber 32, and the compression chamber 32 moves to the inner circumference side while reducing the volume from the outer circumference side. Converge toward the space between the inner peripheral ends of the spiral walls 28 and 30.

A discharge port 50 is formed at the center of the movable scroll substrate 24, and the discharge port 50 communicates with the final compression chamber 32. On the back side (the surface facing the eccentric shaft 14) of the movable scroll substrate 24, a valve housing space (circular concave portion) 52 is formed at a portion facing the discharge port 50, and the discharge port 50 is formed in the valve housing space 52. A discharge valve 54 that opens and closes is provided. The discharge valve 54 includes a reed valve 56
And a retainer 58.

A high-pressure area 60 for receiving the high-pressure refrigerant gas discharged from the compression chamber 32 through the discharge port 50 is formed in the central portion on the back side of the movable scroll substrate 24. The high-pressure region 60 is formed so as to be surrounded by a cylindrical boss portion 24 a protruding from the rear surface of the movable scroll substrate 24, and substantially includes a valve accommodating space 52 that accommodates the discharge valve 54. .

The high-pressure area 60 communicates with the motor chamber 48 via a discharge passage 62 formed along the axis of the drive shaft 8 (including the eccentric shaft 14). The refrigerant gas in the motor chamber 48 is supplied to the outlet 6 provided on the wall of the motor housing 6.
Through 4 it exits to the external refrigerant circuit. The outlet 62a of the discharge passage 62 is opened in the radial direction of the drive shaft 8, and when the refrigerant gas flows out from the outlet 62a, the lubricating oil contained in the refrigerant gas is separated from the refrigerant gas by centrifugal force. The separated lubricating oil is supplied to the recess 4 formed at the bottom of the motor chamber 48.
8a. The concave portion of the motor chamber corresponds to the oil reservoir referred to in the present invention, and the oil reservoir 48a is provided at a lower position than the compression mechanism 21.

The space 66 formed between the outer peripheral surface of the boss portion 24a and the center housing 4 is formed by a seal member 68 and a seal ring interposed between the inner peripheral surface of the boss portion 24a and the outer peripheral surface of the bush 16. 70, drive shaft 8 and bush 16
O-ring 72 interposed between the high-pressure region 60
Partitioned. The sealing material 68 and the O-ring 72 correspond to the second sealing material according to the present invention. The space 6
Reference numeral 6 denotes a space between the axial end surface of the movable scroll substrate 24 and the inner wall surface of the center housing 4 with respect to a low-pressure area 74 (suction pressure atmosphere) which is a space for accommodating the movable scroll substrate 24 formed in the center housing 4. Are separated by a sealing material 76 interposed therebetween. The center housing 4 corresponds to the housing according to the present invention.

Thus, between the high pressure region 60 and the low pressure region 74, the low pressure region 7 which is lower than the pressure in the high pressure region 60 is provided.
A space 66 having an intermediate pressure higher than the pressure in 4;
That is, the intermediate pressure region is interposed. Less than,
This space 66 is called an intermediate pressure area. The intermediate pressure region 66 is
This effectively acts to reduce the amount of the refrigerant gas in the high-pressure region 60 leaking to the low-pressure region 74, and exerts a pressure on the back surface of the movable scroll substrate 24 to bend the movable scroll substrate 24 toward the rear surface. Works effectively in suppressing The motor chamber 48 and the intermediate pressure region 66 are provided between the outer peripheral surface of the drive shaft 8 and the inner peripheral surface of the shaft hole of the center housing 4.
And a sealing material 84 that partitions between the two.

A seal member 76 for sealing between the high-pressure area 60 and the intermediate-pressure area 66 is fitted in an annular mounting groove 78 having a rectangular cross section formed in the center housing 4 (see FIG. 2). The seal member 76 is located higher than the oil sump 48a in the motor chamber 48,
A lubricating oil supply passage 80 is formed in the center housing 4 in a straight line so as to be inclined upward so as to supply the lubricating oil from the oil reservoir 48a toward 6. The entrance of the passage 80 is an oil sump 48a.
The outlet is opened near the seal member 76 in the intermediate pressure region 66. In addition, passage 80
A throttle 82 for regulating the flow rate is formed at the outlet of.

According to the scroll compressor constructed as described above, during operation, it is sucked through the inlet 42,
The refrigerant gas, which has been compressed in the compression chamber 32 and has a high pressure, is discharged through the discharge valve 54 to the high pressure region 60, passes through the discharge passage 62, and flows out of the outlet 62 a of the discharge passage 62 into the motor chamber 48. I do. At this time, the lubricating oil contained in the refrigerant gas is separated from the refrigerant gas by centrifugal force and stored in the oil reservoir 48a.

The lubricating oil in the oil sump 48a passes through the passage 80 due to the pressure difference between the pressure in the oil sump 48a and the pressure in the intermediate pressure area 66, and seals 76 in the intermediate pressure area 66.
Is supplied to the seal member 76 through a gap between the center housing 4 and the movable scroll board 24 as shown in FIG. That is, according to the present embodiment, the lubricating oil in oil reservoir 48a can be supplied toward seal member 76 at a higher place. Intermediate pressure area 66
Refrigerant gas in the inside is sealed by the seal material 76 and the movable scroll substrate 2.
Attempts to leak to the low-pressure region 74 through a minute gap in the contact surface with the nozzle 4. Therefore, the lubricating oil supplied as described above wraps around the minute gap between the seal member 76 and the movable scroll substrate 24, thereby suppressing the refrigerant gas in the intermediate pressure region 66 from leaking to the low pressure region 74. . For this reason, the sealing performance is improved, and the leakage of the refrigerant gas to the low pressure side is reduced, so that the efficiency is improved and the wear resistance of the seal member 76 is also improved.

During operation of the compressor, the pressure difference between the intermediate pressure region 66 and the oil reservoir 48a is not always constant, but the pressure in the intermediate pressure region 66 is at least the pressure in the oil reservoir 48a. It is not considered to exceed. In particular, in the present embodiment, since the space between the high-pressure region 60 and the intermediate-pressure region 66 is sealed by the sealing material 68 and the O-ring 72, the pressure in the intermediate-pressure region 66 is guided by the high-pressure refrigerant gas. The pressure can be kept lower than the pressure in the motor chamber 48, and the lubricating oil can be stably supplied to the seal member 76.

In the present embodiment, a restrictor 82 is provided on the outlet side of the passage 80 to regulate the flow rate, so that the refrigerant gas in the motor chamber 48 passes through the passage 80 and passes through the intermediate pressure region 6.
6 can be suppressed, and a decrease in efficiency due to so-called gas blow-through can be prevented. Also, the stop 82
Is provided, the cross-sectional area of the general portion of the passage 80 can be increased to prevent clogging due to sludge or the like.

Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, the oil sump 48
The outlet of the passage 80 provided for supplying the lubricating oil a to the seal member 76 is opened at the groove bottom of the annular mounting groove 78 in which the seal member 76 is accommodated, and the throttle is omitted. Other configurations are the same as those of the above-described embodiment. That is, the oil reservoir 48a and the sealing material 7
The lubricating oil can be directly supplied to the seal member 76. According to such a configuration, it is possible to supply a larger amount of lubricating oil to the seal member 76. In addition, the sealing material 76 is moved by the pressure acting in the mounting groove 78 to the movable scroll substrate 24.
And the low-pressure side surface of the mounting groove 78 is pressed. These further enhance the sealing effect. Meanwhile, the movable scroll substrate 24 may be displaced in the axial direction due to the balance between the pressure in the compression chamber 32 and the pressure on the back side. According to the configuration in which the lubricating oil is supplied directly into the mounting groove 78, the seal member 76 is not affected by the axial displacement as described above.
Follow, and the pressurized state of the seal member 76 against the axial end surface of the movable scroll substrate 24 is maintained, so that stable sealing performance can be maintained.

It should be noted that the present invention is not limited to the embodiment, and can be appropriately changed without departing from the gist of the present invention. Although the case where the electric motor 46 is used as the driving source has been described, for example, an engine may be used as the driving source instead of the electric motor 46, and thus the oil reservoir 48 a is not limited to the bottom of the motor chamber 48. Further, the throttle 82 provided in the passage 80 may be omitted. Further, the present invention is not limited to the horizontal type, but may be applied to a vertical type as long as the position of the sealing material is provided at a position higher than the oil reservoir.

[0028]

As described in detail above, according to the present invention,
In a scroll compressor in which a high-pressure region for receiving high-pressure refrigerant gas discharged from a compression chamber is formed on the back side of a movable scroll substrate, a gas leakage prevention device is provided between a high-pressure side and a low-pressure side. By supplying a sufficient amount of lubricating oil to the sealing material, the sealing performance can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an entire scroll type compressor.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a partial cross-sectional view showing another embodiment.

[Explanation of symbols]

 2 Fixed scroll 4 Center housing 20 Movable scroll 24 Movable scroll board 32 Compression chamber 48a Oil reservoir 60 High pressure area 66 Intermediate pressure area 68 Seal material 70 Seal ring 72 O ring 74 Low pressure area 76 Seal material 78 Mounting groove 80 Passage 82 Restrictor

[Procedure amendment]

[Submission date] January 11, 2001 (2001.1.1)
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kenji Isomura 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. Inside Toyota Industries Corporation (72) Inventor Naohiro Nakajima 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. Inside Toyota Industries Corporation (72) Inventor Shinji Tsubai 2-1-1 Toyota-machi, Kariya-shi, Aichi Prefecture Incorporated Inside Toyota Industries Corporation (72) Inventor Yasushi Watanabe 2-1-1, Toyota-machi, Kariya City, Aichi Prefecture Shares F term in Toyota Industries Corporation (reference) 3H029 AA02 AA15 AB03 BB09 BB16 CC05 CC09 CC19 CC22 CC33 3H039 AA02 AA06 AA12 BB11 BB15 CC02 CC08 CC27 CC31 CC33 CC42

Claims (4)

[Claims] 1. A high-pressure area formed on the back side of a movable scroll substrate for receiving a high-pressure refrigerant gas discharged from a compression chamber, and a low-pressure area partitioned from the high-pressure area via an intermediate area. A seal member is provided between the intermediate region and the low-pressure region, and an oil reservoir into which high-pressure refrigerant gas in the high-pressure region is introduced at a position lower than a position where the seal member is installed. A scroll type compressor, comprising: a lubricating oil supply passage for feeding lubricating oil in the oil reservoir toward the seal material by a pressure difference between the oil reservoir and the intermediate region. A scroll compressor characterized by the following. 2. A second seal member is provided between the high-pressure area and the intermediate area, whereby the intermediate area reduces an intermediate pressure between the high-pressure area and the low-pressure area. A scroll type compressor having an intermediate pressure region having a pressure. 3. The scroll compressor according to claim 1, wherein the passage is provided with a throttle for regulating a flow rate. 4. The scroll-type compressor according to claim 1, wherein a mounting groove for the seal material is formed in a housing that houses the movable scroll substrate.
The scroll type compressor, wherein the passage is communicated with the mounting groove.