JP2811848B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an oilless crawl type compressor suitable for use in, for example, compressing air or the like or creating a vacuum in equipment.

[Conventional technology]

In a conventional scroll type compressor, a housing, a fixed scroll provided in the housing, a drive shaft rotatably provided in the housing, and a drive shaft rotatably provided on a crank shaft of the drive shaft via a swing bearing. Provided,
The orbital scroll generally includes an orbiting scroll that rotates eccentrically with respect to the fixed scroll, and a thrust slide bearing provided between the orbiting scroll and the housing.

When compressing air, the drive shaft is rotated to orbit the orbiting scroll, and the air sucked from the suction port is sealed in a compression chamber formed between the fixed scroll and the orbiting scroll. After compressing air by gradually reducing the compression chamber while revolving, compressed air is discharged from a discharge port provided at the center of the fixed scroll.

Here, as shown in, for example, Japanese Utility Model Publication No. Sho 63-45586, pressure is introduced to the back of the movable scroll part to reduce the thrust load, and as seen in Japanese Utility Model Publication No. 64-4888. In some cases, working chambers are provided on both sides of a movable scroll member, and a thrust bearing is not required.

[Problems to be solved by the invention]

However, there are various types of force applied to the movable scroll member, such as a thrust force due to the internal pressure, a rotational force or a centrifugal force for rotating the movable scroll member, and the like.
It is difficult to completely balance the thrust load. In the conventional scroll compressor, the movable scroll member tilts, the blade tip of the movable scroll member contacts the bottom surface of the fixed scroll member, and the eccentricity of the crankshaft is reduced by the radius. And the generation of metal powder,
Particularly, the non-lubricated type has a problem that the compressor is damaged due to seizure at the tip of the scroll blade.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce friction between a rotary scroll and a fixed scroll in the axial direction of a drive shaft, and to additionally provide a lubrication inside a compression chamber of a compressor. It is a further object to prevent the inflow of oil.

[Means for solving the problem]

In order to achieve the above object, in the present invention, a housing, a fixed scroll provided in the housing,
A drive shaft rotatably provided on the housing, and a drive shaft rotatably provided via a bearing on the drive shaft to rotate eccentrically with respect to the fixed scroll and a fluid compression chamber between the fixed scroll and the fixed scroll. A rotary scroll to be formed, a housing, a fixed scroll provided in the housing, a drive shaft rotatably provided in the housing, and a drive shaft rotatably provided through a bearing on the drive shaft. A rotary scroll that rotates eccentrically with respect to the fixed scroll and forms a fluid compression chamber with the fixed scroll, a suction unit provided in the housing, and a suction unit that sucks fluid into the compression chamber, and provided in the housing;
A discharge unit that discharges the fluid compressed in the compression chamber, and a pressing unit that presses the rotary scroll in a direction opposite to the fixed scroll side in the axial direction of the drive shaft,
A side of the rotary scroll opposite to the fixed scroll,
A receiving portion slidably provided between the rotary scroll and the housing and pressed by one end of the pressing device; and a lubricating oil supply device for supplying lubricating oil to the receiving portion and a bearing of the drive shaft. And a plate member provided on the housing and disposed between the rotary scroll and the receiving portion, and pressed by the other end of the pressing means so as to slidably contact the plate member. And a first seal portion for sealing between the members.

In the present invention, a second seal portion is provided between the first seal portion and the suction portion, and the lubricating oil separator chamber is formed by the second seal portion and the first seal portion. It may be formed.

[Action]

In the present invention having the above configuration, when the drive shaft is driven to rotate, the rotary scroll rotates eccentrically via the bearing. By the eccentric rotation of the rotary scroll, the fluid from the suction part is compressed in the compression chamber. At this time, the pressing means presses the rotary scroll in a direction opposite to the fixed scroll side in the axial direction of the drive shaft. At this time, a sliding action is performed between the rotary scroll and the housing while the receiving portion is pressed by one end of the pressing means.

For this reason, the rotary scroll is not pressed against the fixed scroll, but is pressed against the receiving portion on the opposite side of the fixed scroll to perform eccentric rotation.

In addition, the lubricating oil from the lubricating oil supply unit lubricates the bearing and the receiving unit, but the first sealing unit pressed by the other end of the pressing unit so as to slide on the plate member.
Lubricating oil can be prevented from flowing into the suction section,
Further, since the first seal portion is in sliding contact with the plate member, it can be rotated without reducing the sliding range of the rotary scroll. Further, since the first seal portion is pressed by the other end of the pressing means, a load can always be applied to the first seal portion, and sufficient sealing performance can be obtained. Furthermore, the lubricating oil separator chamber
It is possible to further prevent the lubricating oil from flowing into the suction portion.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, a first embodiment of the present invention will be described with reference to FIG. 1 showing the first embodiment of the present invention and FIG. In FIG. 1, a drive shaft 1 driven by a drive source such as an engine is rotatably supported on a front housing 4 by bearings 2 and 3. The swivel bearing 5 is press-fitted. A rear housing 8 is fixed to the front housing 4 via a plate 7 by fastening means such as bolts, and a fixed scroll 9 is fixed to the rear housing 8 by fastening means such as bolts. The combination of the fixed scroll 9 and the rotary scroll 6 forms a compression chamber 10. A rotating race member 11 and a rotating thrust plate 12 are fixed to the rotating scroll 6 by fastening means such as a nut, and a fixed race member 13 and a fixed thrust plate 14 are mounted on the front housing 4 by screws (not shown). Are fastened by means. The rotation side race member 11, the rotation side thrust plate 12, the fixed side race member 13, the fixed side thrust plate 14, and the combination of the steel ball 15 as a spherical member constitute a rotation prevention of the rotary scroll 6 and a thrust bearing mechanism. . The rotary scroll 6 is provided with a biasing member 16 as a pressing means and a thrust ring 17, and the thrust ring 17 is provided with an oil seal member 18 made of an elastic material such as rubber. The rotary scroll 6 and the fixed scroll 9 are provided with seal members 6c and 9c for improving the sealing performance of the compression chamber 10. The front housing 4 is provided with a lubricating oil port 4a, a lubricating oil chamber 4b, and a drain port 4c, and is provided with an oil seal 19 for preventing the lubricating oil from leaking outside along the drive shaft 1. Lubricating oil passage inside drive shaft 1
A lubrication oil supply means 1c is provided together with the lubrication oil port 4a and the lubrication oil chamber 4b. The drain port 4c is a discharge port. The rear housing 8 has a suction port 8a for sucking a working fluid, a suction space 8b, and a discharge port 8a.
A cooling water inlet port 8d, a cooling water jacket 8e, and a cooling water outlet port 8f are provided. 20
Reference numerals a, 20b, and 20c denote circlips for preventing bearing movement.
a, 21b, 21c are O-rings. In FIG. 1, 1b is a balance weight. The rotary scroll 6 is provided with a seal member 6d as a second seal portion.
The lubricating oil separator chamber 150 is formed between the lubricating chamber 4b and the suction space 8b. The working fluid discharged from the discharge port 8c flows into the separator chamber 150 from the port 7a, and is discharged from the discharge port 7b.

Next, in the first embodiment of the present invention having the above configuration,
The operation will be described. When a rotational force is applied to the drive shaft 1 by a drive source (not shown), the rotary scroll 6 pivotally supported by the eccentric portion 1a includes a fixed-side thrust plate 14, a fixed-side race member 13, a rotary-side thrust plate 12, and a rotary-side race. Due to the action of the ball coupling mechanism as a receiving portion composed of the member 11 and the plurality of steel balls 15, the orbit performs a revolving motion without rotating, and the interaction with the fixed scroll 9 reduces the volume of the compression chamber 10. While acting as a compressor. At this time, the working fluid (for example, a compressible fluid such as air) sucked from the suction port 8a is supplied to the suction space 8b.
Then, the compressed working fluid is supplied to the external device through the discharge port 9d through the discharge port 9d.
The lubricating oil for bearing lubrication is supplied from the lubricating oil port 4a, passes through the lubricating oil passage 1c, lubricates the bearing 5, lubricates the ball coupling mechanism through the lubricating chamber 4b, and then drains from the drain port 4c. Is discharged. At this time, the lubricating oil for lubricating the ball coupling mechanism is discharged from the drain port 4c without leaking to the suction space 8b side by the action of the oil seal member 18 as the first seal portion. For this reason,
The compression action of the working fluid is performed in the compression chamber 10 without including the oil component, and a pure working fluid free of impurities can be supplied.

A thrust load is generated on the rotary scroll 6 in the direction of arrow B in FIG. 1 due to the internal pressure of the compression chamber 10 at the time of the compression action, and a load due to the rotating force or centrifugal force generated on the rotary scroll 6 is applied. . By the thrust force and the urging member 16 and the thrust ring 17 provided on the rotary scroll 6, the rotary scroll 6
1, the thrust force and the pressing force generated by the biasing member 16 are received by a ball coupling mechanism capable of performing sufficient lubrication, and the revolving motion of the rotary scroll 6 is performed. Can be stabilized without vibrating or tilting.

As described above, according to the present embodiment, the revolving motion of the rotary scroll 6 can be stabilized without vibrating and tilting. Therefore, the scroll blade 6a of the rotary scroll 6 comes into contact with the scroll bottom surface 9b of the fixed scroll 9. Therefore, an excellent effect of preventing seizure and damage to the compressor does not occur.

Further, in the present embodiment, a seal member 6d is arranged between the lubrication chamber 4b and the suction space 8b, and a separator chamber 150 is provided,
The separator chamber 150 has a structure in which the discharge fluid from the discharge port 8c is introduced from the port 7a through the throttle 160 through the restrictor 160 and discharged from the port 7b, so that the minute oil leaking from the seal member 18 does not leak to the suction space 8b. An excellent effect that the oil discharged from the port 7b can be made oil-less can also be achieved.

Next, a second embodiment of the present invention is shown in FIG. This second
In the embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the first embodiment, the urging member 16 and the oil seal member are provided on the rotary scroll 6, and the plate member 7 is used as the sliding surface of the oil seal member. In the present embodiment, the urging member 200 and the thrust ring 210 are provided. Is provided on the plate member 7 side, and the sliding surface of the oil seal member 220 is the rotary thrust plate 12. In FIG. 3, reference numeral 230 denotes a fixing sealing member such as an O-ring. With this configuration, the present embodiment can provide the same effects as those of the first embodiment.

Next, a third embodiment of the present invention is shown in FIG. Also in this embodiment, the same components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof will be omitted. In the present embodiment, as shown in FIG. 4, a communication port 6e is provided in the rotary scroll 6 so that the working fluid which is being compressed is supplied to the separator chamber 15.
0, and discharges micro leak oil from the port 7b.

Next, a fourth embodiment of the present invention is shown in FIG. Also in this embodiment, the same components as those in the first to third embodiments are denoted by the same reference numerals, and the description thereof will be omitted.

In the first to third embodiments, the thrust force is applied to the rotary scroll by the urging member. In the present embodiment, the thrust force is applied by pressure. The rotation side thrust plate member 170 has an oil seal member 1
70b and a pressure seal member 170a are provided, and the rotary scroll 6 is provided with a pressure seal member 6f. However,
The seal diameter (diameter of the ring) of the pressure seal member 170a is larger than the seal diameter (diameter of the ring) of the pressure seal member 6f. Therefore, when pressure is introduced into the pressure chamber 180 from the discharge port, the pressure chamber 180 has a rotation-side thrust plate member larger than the area acting on the rotary scroll 6.
Since the area acting on the rotation-side thrust plate member 170 and the rotation-side thrust plate member 170 are larger.
The rotary scroll 6 connected to the shaft receives a force in the direction of arrow C in FIG.

〔The invention's effect〕

As described above, according to the present invention, an excellent effect that the friction between the rotary scroll and the fixed scroll can be reduced can be obtained.

Further, in the present invention, there is an excellent effect that the leakage of the lubricating oil into the compression chamber can be prevented.

[Brief description of the drawings]

1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a sectional view showing a second embodiment of the present invention, and FIG. Sectional view showing a third embodiment of the present invention.
FIG. 5 is a sectional view showing a fourth embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Drive shaft, 1c ... Lubricating oil passage, 4 ... Front housing, 4a ... Lubricating oil port, 5 ... Slewing bearing, 6 ... Rotary scroll, 6d ... Seal member, 7a ... Port, 7b …
... outlet, 8 ... rear housing, 8a ... inlet port,
8c: discharge port, 9: rotary scroll, 10: compression chamber, 15: steel ball, 16: urging member, 18: seal member.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideaki Sasaya 14 Iwatani, Shimowasumi-machi, Nishio-shi, Aichi Pref. Japan Automotive Parts Research Institute Co., Ltd. (56) References 57-195801 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04C 18/02 311

Claims (2)

(57) [Claims] 1. A housing, a fixed scroll provided in the housing, a drive shaft rotatably provided in the housing, and a drive shaft rotatably provided on the drive shaft via a bearing, and A rotary scroll that is eccentrically rotated and forms a fluid compression chamber between the fixed scroll and the fixed scroll; a suction unit provided in the housing, for sucking fluid into the compression chamber; A discharge unit configured to discharge the fluid compressed in the chamber; a pressing unit configured to press the rotary scroll in a direction opposite to the fixed scroll side in an axial direction of the drive shaft; and a fixed scroll of the rotary scroll. The other side,
A receiving portion slidably provided between the rotary scroll and the housing and pressed by one end of the pressing means; and a lubricating oil supply means for supplying lubricating oil to the receiving portion and a bearing of the drive shaft. A plate member provided on the housing and arranged between the rotary scroll and the receiving portion; and a pressing member pressed by the other end of the pressing means so as to slidably contact the plate member; A first seal portion for sealing between the member and a member. 2. A lubricating oil separator chamber is provided between the first seal portion and the suction portion, and a second seal portion is provided between the second seal portion and the first seal portion. The scroll type compressor according to claim 1, wherein: