JP2001221179A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary compressor for preventing metallic contact in a sliding part and improving reliability. SOLUTION: A plurality of dimples are disposed on each sliding part between a vane 17 and a cylinder 13. Concretely, these are following sliding parts (1) At least either one of a tip end surface of a vane 17 sliding with an inner wall of the cylinder 13, or an inner wall of the cylinder 13 with which the tip end surface of the vane 17 is slid. (2) At least one of a side end surface of the vane 17 which is slid with a front side plate 11 and a rear side plate 12, or the front side plate 11 and the rear side plate 13 with which a side end surface of the vane 17 is slid. (3) At least one of an end surface of a rotor 14 which is slid with the front side plate 11 and the rear side plate 12, or the front side plate 11 and the rear side plat 12 with which an end surface of the rotor 14 is slid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor used for an air conditioner of an automobile, and more particularly to a structure of a sliding surface thereof.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show a rotary compressor used in a conventional compressor for automotive air conditioning. This rotary compressor has a cylinder 13 having a cylindrical inner wall whose both ends are closed by a front side plate 11 and a rear side plate 12.
Inside the cylinder 13, a rotor 14 having a part of the outer periphery forming a small gap with the inner wall of the cylinder 13 is provided. The drive shaft 15 formed integrally with the rotor 14 is rotatably supported at both ends by the front side plate 11 and the rear side plate 12. A plurality of slots 16 are provided on the outer peripheral surface of the rotor 14.
Is formed, and one end of a vane 17 is slidably inserted into each slot 16. The other end of vane 17 is cylinder 1
3 to slide with the inner wall. And vane 1
7, together with the cylinder 13, the rotor 14, the front side plate 11 and the rear side plate 12, form a closed space 18.
The cylinder 13 has a suction hole 19 communicating with the closed space 18 on the suction side, and a discharge hole 2 communicating with the closed space 18 on the compression side.
0 is formed.

A cylinder case 21 is provided above the cylinder 13. The cylinder case 21 has a suction port 22 communicating with a suction hole 19 of the cylinder 13 and a refrigerant communicating with a discharge hole 20 of the cylinder 13. Discharge path 23
Are formed. The refrigerant discharge passage 23 is connected to the rear side plate 12.
At the communication hole 24 formed at the end of the hole. The rear side plate 1
A fuel supply case 25 is provided at the rear of the fuel tank 2. An oil reservoir 26 communicating with the discharge hole 20 of the cylinder 13 is formed in the oil supply case 25 through a refrigerant discharge passage 23 and a communication passage 24, and a discharge port 27 communicating with the oil reservoir 26. Are formed. Oil sump 26
An oil control valve unit 29 for supplying the lubricating oil of the oil reservoir 26 to the slot 16 through an oil supply passage 28 formed in the rear side plate 12 is accommodated therein.

When power is transmitted to the drive shaft 15 via an engine (not shown) and a belt (not shown), the rotor 14 rotates clockwise in FIG. 5 and the refrigerant returned from the refrigeration cycle is supplied to the suction port of the cylinder case 21. The air is sucked into the closed space 18 on the suction side from the suction hole 19 of the cylinder 13 and compressed. The compressed refrigerant passes through the discharge hole 20 of the cylinder 13, the refrigerant discharge passage 23, and the communication hole 24 from the closed space 18 on the discharge side, and is supplied to the refueling case 25.
The lubricating oil is separated here and discharged from the discharge port 27 to the refrigeration cycle. The separated lubricating oil is once stored in the oil reservoir 26. The lubricating oil in the oil reservoir 26 is supplied from the oil control valve unit 29 to the oil supply passage 2.
8 and is supplied to the slot 16 of the rotor 14. As a result, a back pressure is applied to the vane 17 by the pressure of the lubricating oil, and the vane 17 is pressed against the inner wall of the cylinder 13,
A reduction in compression performance and generation of abnormal noise due to chattering of the vane 17 are prevented, and lubrication of the vane 17 and the rotor 14 is performed.

[0005]

However, in the conventional rotary compressor, the lubrication between the tip of the vane 17 and the inner peripheral surface of the cylinder 13 is performed by the lubricating oil circulating in the air conditioner system together with the refrigerant. Only rely on. The lubrication of both end surfaces of the vane 17, the sliding surface of the front side plate 11 and the sliding surface of the rear side plate 12 is supplied from the oil control valve unit 29 and supplied to the vane 17 or the rotor 14.
It is lubricated by the lubricating oil flowing out of the gap between the front and rear side plates 11 and 12 and the lubricating oil circulating in the air conditioner system together with the refrigerant. The same applies to the lubrication of both end surfaces of the rotor 14 and the front and rear side plates 11 and 12.
Therefore, the lubricating oil returns poorly to the compressor particularly during high-speed running, high-load operation, and the like. Further, at high temperatures, the viscosity of the lubricating oil decreases, and the oil film thickness becomes thin.
And the inner peripheral surface of the cylinder 13, the both end surfaces of the vane 17 and the sliding surfaces of the front and rear side plates 11, 12 and the both end surfaces of the rotor 14 and the front and rear side plates 11, 12 are brought into metallic contact. In some cases, the amount of wear was increased and reliability was reduced.

Further, as shown in Japanese Patent Application Laid-Open No. 7-174090, a plurality of holes are provided in the thickness direction of the vane, and a coolant is introduced into the holes from the suction passage or the intermediate pressure chamber to the sliding surface and cooled, thereby causing wear. A device that reduces the above has been proposed. However, the rotary compressor to which the present invention is applied is intended to prevent the chattering of the vane by applying pressure to the back of the vane and pressing the vane against the inner peripheral surface of the cylinder. And pressure drop,
It is not preferable because chattering of the vane causes abnormal noise and the like.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a highly reliable rotary compressor that prevents metal contact in a sliding portion.

[0008]

As a means for solving the above problems, the present invention provides a cylinder having a cylindrical inner wall, a front side plate and a rear side plate closing both ends of the cylinder, and an inside of the cylinder. A rotor, a part of the outer periphery of which forms a small gap with the cylinder inner wall, a plurality of vanes one end of which is slidably inserted into a slot provided in the rotor and the other end of which slides with the cylinder inner wall, A confined space formed integrally with the rotor, comprising a drive shaft rotatably supported at both ends by the front side plate and the rear side plate, and surrounded by the cylinder, the front side plate, the rear side plate, the rotor and the vane. And a plurality of dimples are provided at each sliding portion between the vane and the cylinder.

Specifically, there are the following three sliding parts. (1) At least one of the tip surface of the vane sliding on the inner wall of the cylinder and the inner wall of the cylinder on which the tip surface of the vane slides. (2) At least one of the side end surface of the vane sliding on the front side plate and the rear side plate, or the front side plate and the rear side plate on which the side end surface of the vane slides. (3) At least one of the end surface of the rotor that slides with respect to the front side plate and the rear side plate, or the front side plate and the rear side plate that slides with the end surface of the rotor.

[0010] By means configured in this way, in each sliding portion inside the cylinder, the lubricating oil circulating in the air conditioner system together with the refrigerant and the lubricating oil flowing out from the back of the vane accumulate in the dimples of the sliding portion, so that the dimples are formed. Pressure is generated in the inside, and a decrease in the oil film thickness of the sliding portion can be prevented. In addition, the cooling action of the accumulated lubricating oil suppresses sliding heat generation, prevents a decrease in lubricating oil viscosity, and prevents a decrease in oil film thickness. By these actions, it is possible to secure an oil film at the sliding portion. By arbitrarily combining the sliding portions provided with the dimples, a synergistic effect of these operations can be expected. Further, since the decrease in the oil film thickness in the sliding portions is reduced, the leakage of the compressed fluid between the sliding portions is less likely to occur, and the commercial value is improved.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show a rotary compressor according to an embodiment of the present invention. This rotary compressor is substantially the same as the rotary compressor shown in FIGS. 6 and 7 except that dimples are formed on each sliding portion in the cylinder 13.
Corresponding parts have the same reference characters allotted, and description thereof will not be repeated.

The sliding portion forming the dimple will be described in detail. First, on the sliding surface side, as shown in FIG. Are formed in a random arrangement. The front side plate 11 and the rear side plate 12
A plurality of dimples 17b are formed in random arrangement on both end surfaces of the vane 17 which slides. Further, a plurality of dimples 14a are formed in a random arrangement on both end surfaces of the rotor 14 sliding with the front side plate 11 and the rear side plate 12.

Next, on the sliding surface side, as shown in FIG. 4, a plurality of dimples 13a are formed in a random arrangement on the inner wall surface of the cylinder 13 on which the tip end surface of the vane 17 slides. Further, both end surfaces of the vane 17 and the rotor 1
The front side plate 11 and the rear side plate 12 on which both end surfaces of the front 4 slide.
Each of the plurality of dimples 11a and 12a is formed in a random arrangement.

The dimples 11a, 12a, 13a,
The shapes of 14a, 17a and 17b are as shown in FIG.
The opening edge is a circle having a diameter D = 1 mm, and the concave surface has a depth H = 0.
It is a 3 mm spherical surface. Further, the dimples 11a, 1
The pitch p of 2a, 13a, 14a, 17a, 17b is
3 mm to 10 mm is preferred. Dimples 11a, 12
The shapes of a, 13a, 14a, 17a, and 17b are not limited to these, and may be, for example, ellipses. Further, the dimples 11a, 12a, 13a, 14a, 17a, 17
The arrangement of b is not limited to random, but is triangular, square, radial,
A fixed arrangement of concentric circles or the like may be used. The dimple can be formed by a method such as pressing or shot.

As described above, the dimples 11a, 12a, 13a, 14a, and 17 are provided on each sliding surface side and the sliding surface side.
The basic operation of the rotary compressor in which a and 17b are formed is the same as that of the conventional rotary compressor, and therefore is omitted, and only the operation of the lubricating oil will be described here.

During operation, the lubricating oil in the oil reservoir 26 enters the cylinder 13 via the oil supply passage 28 by the oil control valve unit 29 and is supplied to the space defined by the slot 16 and the vane 17 of the rotor 14. . The lubricating oil in this space flows out from both end surfaces of the rotor 14 and both end surfaces of the vane 17 by the stroke of the vane 17 to lubricate each sliding portion. The lubricating oil circulated from the air conditioning system together with the suction refrigerant from the suction port 22 and returned returns particularly to the lubrication of the tip end surface of the vane 17 and the inner peripheral surface of the cylinder 13.

That is, the lubricating oil returned from the air conditioner system together with the refrigerant accumulates in the plurality of dimples 17a, 13a on the tip end surface of the vane 17 and the inner wall of the cylinder 13. Therefore, a decrease in the oil film thickness of the lubricating oil is small. In addition, since the lubricating oil works to reduce the heat generated by sliding at the tip of the vane 17, the thickness of the oil film is less likely to be reduced. Thus, contact between metals due to an increase in the oil film is prevented. Therefore, a highly reliable compressor can be provided. Further, it is possible to secure an oil film between the front end surface of the vane 17 and the inner wall of the cylinder 13, and this lubricating oil increases the sealing effect of the front end portion of the vane 17, so that the compressed fluid
Leakage from the closed space 18 on the discharge side to the closed space 18 on the suction side through the tip of the vane 17 is unlikely to occur.

On the other hand, the lubricating oil supplied to the space formed by the slots 16 and the vanes 17 of the rotor 14 and flowing out from both end surfaces of the rotor 14 and both end surfaces of the vane 17 is supplied to the both end surfaces of the vane 17 and the front portion. Side plate 11 and rear side plate 1
2, a plurality of dimples 17b on both end surfaces of the rotor 14,
11a, 11b and 14a also accumulate. For this reason, like the lubricating oil returned from the air conditioner system together with the refrigerant, the oil film thickness at each sliding portion is unlikely to decrease, and the contact between metals due to the increase in the oil film is prevented,
Leakage of the compressed fluid from the discharge side to the suction side is prevented.

In the above-described embodiment, dimples are provided on both the sliding surface side and the sliding surface side in all the sliding portions. May be provided only on the sliding portion where the occurrence of the occurrence is particularly likely. Also,
The same effect can be expected even if dimples are provided only on the sliding surface side of each sliding portion or only on the sliding surface side. However, a further synergistic effect can be obtained by providing dimples on both the sliding surface side and the sliding surface side as in the above-described embodiment.

By forming the same dimples on both surfaces of the vane 17, that is, on the surface facing the slot 16, it is possible to prevent a decrease in oil film thickness between the vane 17 and the slot 16 and metal contact.

[0022]

As is clear from the above description, according to the present invention, a plurality of dimples are provided on the sliding portion.
By holding the lubricating oil on the sliding portion, lubricity is improved and a highly reliable compressor can be provided. In addition, it is possible to secure an oil film on the sliding portion, and the lubricating oil increases the sealing effect of the sliding portion, and the compressed fluid leaks into the closed space on the discharge side or the closed space on the suction side. It becomes difficult.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a rotary compressor according to the present invention.

FIG. 2 is a cross-sectional view of the rotary compressor of FIG. 1 taken along the line II.

FIG. 3 is a perspective view of a rotor and vanes of the rotary compressor of FIG. 1;

FIG. 4 is a perspective view of a cylinder, a front side plate, and a rear side plate of the rotary compressor of FIG. 1;

FIG. 5 is a sectional view of a dimple.

FIG. 6 is a longitudinal sectional view of a conventional rotary compressor.

FIG. 7 is a cross-sectional view of the rotary compressor of FIG. 6, taken along line II-II.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Front side plate 12 Rear side plate 13 Cylinder 14 Rotor 15 Drive shaft 16 Slot 17 Vane 18 Enclosure space 11a, 12a, 13a, 14a, 17a, 17b Dimple

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akihiko Shimizu 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture F-term (reference) in Matsushita Electric Industrial Co., Ltd. CC05 CC10 CC16 DD03 DD06 DD07

Claims (6)

[Claims] 1. A cylinder having a cylindrical inner wall, a front side plate and a rear side plate closing both ends of the cylinder, and a rotor disposed inside the cylinder and having a part of the outer periphery forming a small gap with the cylinder inner wall. A plurality of vanes, one end of which is slidably inserted into a slot provided in the rotor and the other end of which slides on the inner wall of the cylinder, and integrally formed with the rotor, and both ends of which rotate on the front side plate and the rear side plate. A drive shaft freely supported by the shaft, the cylinder, the front side plate, the rear side plate,
In a rotary compressor forming a confined space surrounded by a rotor and a vane, a tip surface of the vane sliding on an inner wall of the cylinder, or an inner wall of the cylinder on which a tip surface of the vane slides. A rotary compressor having a plurality of dimples provided on at least one of them. 2. A plurality of side end surfaces of the vane sliding on the front side plate and the rear side plate, or at least one of the front side plate and the rear side plate on which the side end surface of the vane slides. 2. The rotary compressor according to claim 1, wherein said dimple is provided. 3. A plurality of dimples on an end surface of the rotor sliding on the front side plate and the rear side plate, or on at least one of the front side plate and the rear side plate on which the end surface of the rotor slides. The rotary compressor according to claim 1, further comprising: 4. A cylinder having a cylindrical inner wall, a front side plate and a rear side plate closing both ends of the cylinder, and a rotor disposed inside the cylinder and having a part of the outer periphery forming a small gap with the cylinder inner wall. A plurality of vanes, one end of which is slidably inserted into a slot provided in the rotor and the other end of which slides on the inner wall of the cylinder, and integrally formed with the rotor, and both ends of which rotate on the front side plate and the rear side plate. A drive shaft freely supported by the shaft, the cylinder, the front side plate, the rear side plate,
In a rotary compressor forming a confined space surrounded by a rotor and a vane, the side end surface of the vane sliding on the front side plate and the rear side plate, or the front end on which the side end surface of the vane slides A rotary compressor comprising a plurality of dimples provided on at least one of a part side plate and a rear part side plate. 5. A plurality of dimples on an end surface of the rotor sliding on the front side plate and the rear side plate, or on at least one of the front side plate and the rear side plate on which the end surface of the rotor slides. The rotary compressor according to claim 4, further comprising: 6. A cylinder having a cylindrical inner wall, a front side plate and a rear side plate closing both ends of the cylinder, and a rotor disposed inside the cylinder and having a part of the outer periphery forming a small gap with the cylinder inner wall. A plurality of vanes, one end of which is slidably inserted into a slot provided in the rotor and the other end of which slides on the inner wall of the cylinder, and integrally formed with the rotor, and both ends of which rotate on the front side plate and the rear side plate. A drive shaft freely supported by the shaft, the cylinder, the front side plate, the rear side plate,
In a rotary compressor forming a confined space surrounded by a rotor and a vane, the end face of the rotor sliding on the front side plate and the rear side plate, or the front side plate on which the end face of the rotor slides A rotary compressor having a plurality of dimples provided on at least one of a rear side plate and a rear side plate.