JP2964073B2 - Gas compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas compressor used in, for example, an air conditioner of an automobile.

[0002]

2. Description of the Related Art Conventionally, an example of a gas compressor is shown in FIG.
The following are known. In this gas compressor, as shown in FIG.
And the casing 1 accommodates the compressor main body 3. The compressor main body 3 includes a cylinder 6, and a front side block 4 and a rear side block 5 are attached to both ends of the cylinder 6, and the cylinder 6, the front side block 4, and the rear side block 5 shown in FIG. Such an elliptical cylindrical compression chamber 7 is formed.

In the compression chamber 7, a rotor 8 is rotatably housed. The rotor 8 is integrally provided with a rotor shaft 8a penetrating between the end faces, and the rotor shaft 8a is rotatably supported by a bearing 4a of the front side block 4 and a bearing 5a of the rear side block 5. As shown in FIG. 5, a plurality of (five) vane grooves 9 for accommodating the vanes 10 are provided in the radial direction of the rotor 8. It is stored so that it can appear and disappear freely. The vane 10 is urged toward the inner peripheral surface of the compression chamber 7 by the centrifugal force and the oil pressure at the bottom of the vane groove 9 when the rotor 8 rotates.

The suction port of the compression chamber 7 is configured to be able to communicate with the suction chamber 12 via a front side block suction port. The discharge ports 13 of the compression chamber 7 are provided with discharge valves 14, 14. The discharge ports 13, 13
Communicates with a discharge passage (not shown) formed in the thickness direction of the rear side block 5, and the end of the discharge passage is connected to an oil separator block 19 integrally mounted on the discharge chamber 16 side of the rear side block 5. It is connected to the separator 15. In the oil separator 15, a passage communicating with the above-described discharge passage is formed, and a cylindrical filter (wire mesh) is provided at the end of this passage. The discharge port of the oil separator 15 faces the discharge chamber 16.

An oil reservoir 17 for storing lubricating oil is formed at the bottom of the discharge chamber 16. The lubricating oil in the oil sump 17 is supplied to a lubricating oil passage 21 provided in the rear side block 5.
To the bearing 5 a of the rotor 8, and further to the rotor side and the bottom of the vane groove 9 via the ring groove 22 and the lubricating oil passage 23. Further, the lubricating oil passage 21 is branched from the middle, and the branched portions are a lubricating oil passage 24 provided in the cylinder block 6 and a lubricating oil passage 25 provided in the front side block 4.
, And is connected to the bearing 4a of the rotor 8.

In a conventional gas compressor having such a configuration,
By the rotation of the rotor 8, low-pressure refrigerant gas is sucked from the suction chamber 12 into the compression chamber 7, and the sucked gas is supplied to the vane 10.
Compressed with rotation of. The compressed gas is discharged to the discharge chamber 16 via the discharge ports 13, 13 of the compression chamber 7, the discharge valves 14, 14, the discharge passage, and the oil separator 15. During this discharge, the oil separator 15 separates the oil from the high-pressure refrigerant gas, and the separated oil is discharged into the discharge chamber 16.
Falls into the oil sump 17 at the bottom of the. On the other hand, between the suction chamber 12 or the compression chamber 7 and the discharge chamber 16, a pressure difference occurs between the discharge chamber 16 and the suction chamber 12 or the compression chamber 7. Therefore, due to this pressure difference, the lubricating oil in the oil sump 17 passes through the lubricating oil passage 21 and the bearing 5a, the lubricating oil passage 2
1, is supplied to the bearing 4a via the lubricating oil passage 24 and the lubricating oil passage 25. Further, after the lubricating oil is supplied to the bottom of the vane groove 9 or the rotor side through the lubricating oil passage 21, the ring groove 22, and the lubricating oil passage 23,
It leaks into the compression chamber 7.

As described above, in the conventional gas compressor, the supply of the lubricating oil to the bearings 4a and 5a of the rotor 8 and the compression chamber 7 depends on the pressure difference between the discharge chamber 16 and the compression chamber 7. Even when the compression operation by the compressor 7 is stopped, the lubricating oil flows into the compression chamber 7 from the oil reservoir 17 through the bearings 4a and 5a of the rotor 8, the vane groove bottom, and the rotor side while the pressure difference remains. In particular, a large amount of lubricating oil and refrigerant gas flow into the compression chamber 7 and flow into the suction chamber 12. For this reason, when the compression operation is restarted, the lubricating oil is compressed in the compression chamber 7, which has the disadvantage of requiring a large starting torque, and in addition, the reverse rotation of the rotor 8 of the gas compressor occurs, causing the vane 10 to rotate. However, there is a problem that abnormal sound is generated.

Therefore, the following two methods can be considered as methods for solving such a problem. In the first method, an on-off valve (spool valve) for opening and closing the lubricating oil passage 21 is provided on the oil reservoir 17 side of the lubricating oil passage 21, and the on-off valve is opened during the compression operation of the compression chamber 7 to lubricate the lubricating oil passage 21. The oil is supplied to the compression chamber 7 and the like via the bearing, the bottom of the vane groove, or the rotor side. When the compression of the compression chamber 7 is stopped, the on-off valve is closed to stop the supply of the lubricating oil. That is,
In the first method, during operation, the refrigerant gas discharged from the compression chamber 7 acts on the on-off valve to open the lubricating oil passage 21, and when the operation is stopped, the lubricating oil passage 2
1 is closed. In the second method, in order to prevent the lubricating oil from flowing into the suction chamber 12 (backflow), a suction port connecting the suction chamber 12 and the suction pipe is provided instead of the opening / closing valve of the first method. 4 is provided with a check valve 40 drawn by a broken line.

[0009]

However, in the first method, when the operation of the gas compressor is stopped, the bearings 4a,
Since the supply of the lubricating oil to the bearing 5a is completely stopped,
If the on-off valve fails in a closed state, there is a problem that the risk of seizure of the bearings 4a and 5a of the rotor 8 is high. Further, when the operation is stopped, the vane groove bottom is maintained at a low pressure in order to shut off all the supply of the lubricating oil. For this reason, when restarting with this pressure difference, vane 1
There is a problem that chattering occurs due to an insufficient pressing force against the inner peripheral surface of the zero compression chamber 7. In order to prevent this problem, when the operation is stopped, the discharge chamber 1
A structure for supplying the high-pressure gas on the 6 side is conceivable, but when such a high-pressure gas is supplied, reverse rotation occurs, and a check valve is required to prevent this reverse rotation, which leads to an increase in cost as a whole. Problems occur. on the other hand,
In the second method, there is a problem that the cost is increased due to the necessity of the check valve, and that the starting torque cannot be reduced when the gas compressor is restarted.

Accordingly, an object of the present invention is to provide a gas compressor capable of reducing the starting torque at the time of restarting the compression operation and preventing chattering of the rotating body of the compression chamber at the time of restarting. It is in.

[0011]

In order to achieve the above object, according to the present invention, a compression chamber 7 for compressing a gas by a change in volume due to a rotational movement of a rotating body, and a gas after compression in the compression chamber 7 are provided. The discharge chamber 16 for discharging, an oil reservoir 17 on which the pressure of the discharge chamber 16 acts, and the oil reservoir 17 are connected to the bearings 4a and 5a of the rotating body. A first lubricating oil passage for supplying oil to the bearings 4a and 5a is connected to the oil sump 17 and the compression chamber 7, and the lubricating oil in the oil sump 17 is supplied to the bottom of the vane groove or the rotor side by the pressure of the discharge chamber 16. And a second lubricating oil passage. Further, in the present invention, the second lubricating oil passage is provided in the middle of the second lubricating oil passage so that the second lubricating oil passage is opened during the compression operation of the compression chamber 7 and the second lubricating oil passage is closed when the compression of the compression chamber 7 is stopped. A lubricating oil passage opening / closing means is provided.

In the present invention having such a configuration, when the compression of the compression chamber 7 is stopped, the lubricating oil passage opening / closing means closes the second lubricating oil passage. Therefore, when the compression operation is stopped, the amount of the lubricating oil flowing into the compression chamber 7 can be greatly reduced, so that the starting torque when the compression operation is restarted can be reduced.
Further, the lubricating oil passage opening / closing means of the present invention is, for example, interposed in the middle of the second lubricating oil passage to open and close the second lubricating oil passage. Gas collision means for guiding the gas to collide with it and causing the valve body 37 to open the second lubricating oil passage by this collision, and when the discharged gas does not collide with the valve body 37, the valve body 37 is moved to the second lubricating oil passage. And a resilient member such as a spring 39 that closes the. Further, the lubricating oil passage opening / closing means includes a second lubricating oil passage.
When the passage is closed, the pressure difference between the discharge chamber 16 and the compression chamber 7
As a result, the lubricating oil in the oil sump 17 passes through the first lubricating oil passage.
To the bearing of the rotor via
I am trying to put it.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to FIGS. FIG.
FIG. 1 is a cross-sectional view illustrating an overall configuration of a gas compressor according to an embodiment. FIG. 2 is a diagram illustrating the operation of the gas compressor during gas compression. FIG. 3 is a diagram illustrating an operation of the gas compressor when gas compression is stopped. Since this embodiment has the same components as those of the conventional gas compressor shown in FIGS. 4 and 5, the same components are denoted by the same reference numerals and description thereof will be omitted or simplified. .

In this embodiment, as shown in FIG.
A lubricating oil passage 21 for supplying the lubricating oil in the oil sump 17 to the bearing 5 a is provided in the rear side block 5, an upstream side of the lubricating oil passage 21 is arranged in the oil sump 17, and a downstream side of the It is connected to the bearing 5a. The lubricating oil passage 21 is branched in the middle thereof, and this branch portion is connected to the bearing 4 a via a lubricating oil passage 24 and a lubricating oil passage 25 provided in the cylinder 6 and the front side block 4. Therefore, the lubricating oil passage 21, the lubricating oil passage 24, and the lubricating oil passage 25
The first to supply the lubricating oil of the oil sump 17 to the sliding portion such as 5a
Form a lubricating oil passage.

An oil separator block 31 is attached to the rear side block 5, as shown in FIG. As shown in FIG. 1, the oil separator block 31 is provided with an oil separator 15 similar to the conventional one on the upper side. A lower portion of the oil separator block 31 is disposed in the oil reservoir 17, and a lubricating oil passage 32 used for supplying lubricating oil to the compression chamber 7 is provided in the lower portion of the block. A valve chamber 33 is provided in the middle of 32. An upstream side of the lubricating oil passage 32 is disposed in the oil sump 17, and a downstream side thereof is provided with a ring groove 34 provided in a ring shape on an outer peripheral portion of a flange of the rear side block 5, and a lubricating oil passage connected to the ring groove 34. 35 to the vane groove bottom or the rotor side. Accordingly, the lubricating oil passage 32, the ring groove 34, and the lubricating oil passage 35 form a second lubricating oil passage that supplies lubricating oil to the compression chamber 7, the bottom of the vane groove 9 in the compression chamber 7, the rotor side, and the like. I do.

The valve chamber 33 is formed in a cylindrical shape, and as shown in FIG. 1, a through hole 36 is provided at one end and the other end is opened. A valve element (sproll) 37 is slidably provided in the length direction in the valve chamber 33, and is configured to open and close the lubricating oil passage 32 by the action of the valve element 37.
That is, the valve body 37 has a cylindrical shape having a bottom surface, and a concave groove 37a is formed in a part of the body in the circumferential direction. A discharge passage 38 (see FIG. 2) connecting the compression chamber 7 and the discharge chamber 16 is provided outside the bottom surface (pressure receiving surface) of the valve body 37.
In the middle of the process, the jet of the discharged gas immediately after being discharged from the compression chamber 7 acts directly. As shown in FIG. 1, a compression coil spring 39 that constantly biases the valve body 37 toward the discharge passage 38 is provided inside the valve body 37.

Next, an example of the operation of the embodiment having such a configuration will be described with reference to the drawings. During the compression operation of the compression chamber 7, high-pressure refrigerant gas is discharged from the compression chamber 7, and the discharged refrigerant gas collides with the bottom surface of the valve body 37 via the discharge passage 38 as shown in FIG. The valve body 37 resists the force of the compression coil spring 39 as shown in FIG.
The position indicated by. Therefore, during the compression operation of the compression chamber 7, the concave groove 37a of the valve body 37 is engaged with the lubricating oil passage 32, and the lubricating oil passage 32 is opened. Therefore, due to the pressure difference between the discharge chamber 16 and the compression chamber 7, the lubricating oil in the oil sump 17 is supplied to the bottom of the vane groove or the rotor side through the lubricating oil passage 32, the ring groove 34, and the lubricating oil passage 35. Is done. Further, the refrigerant gas discharged from the compression chamber 7 and acting on the bottom surface of the valve body 37 flows into the discharge chamber 16 through the discharge passage 38 and the oil separator 15. In parallel with these operations, the lubricating oil in the oil sump 17 is supplied to the rotor 8 via the lubricating oil passage 21.
While being supplied to the bearing 4a of the rotor 8 via the lubricating oil passage 21, the lubricating oil passage 24, and the lubricating oil passage 25, and then flows into the compression chamber 7. The supply of the lubricating oil also utilizes the pressure difference between the discharge chamber 16 and the compression chamber 7.

On the other hand, when the compression operation of the compression chamber 7 is stopped, the high-pressure refrigerant gas is not discharged from the compression chamber 7, so that the action of the refrigerant gas on the bottom surface of the valve body 37 is stopped.
The valve body 37 is brought to the position shown in FIG. Therefore, when the compression operation of the compression chamber 7 is stopped, the valve element 37 closes the lubricating oil passage 32, so that the supply of the lubricating oil from the oil reservoir 17 into the compression chamber 7 is stopped.
On the other hand, immediately after the compression operation is stopped, since the discharge chamber 16 has a high pressure difference and the compression chamber 7 has a low pressure difference, the lubricating oil in the oil sump 17 passes through the lubricating oil passage 21 and the like, and the bearing of the rotor 8 After being supplied to 4a and 5a, it flows into the compression chamber 7. Therefore, when the compression operation is stopped, the supply of the lubricating oil to the bearings 4a and 5a of the rotor 8 is ensured, while the supply of the lubricating oil to the compression chamber 7 is stopped via the bottom of the vane groove and the rotor side. A large amount of lubricating oil does not flow into 7.
Therefore, when the compression operation is restarted, it is not necessary to compress a large amount of the lubricating oil in the compression chamber 7, so that the starting torque when the compression operation is restarted can be reduced.

As described above, in this embodiment,
A first lubricating oil passage for supplying the lubricating oil of the oil sump 17 to the bearings 4a and 5a of the rotor 8, and a first lubricating oil passage for supplying the lubricating oil of the oil sump 17 to the compression chamber 7 via the bottom of the vane groove or the rotor side. The second lubricating oil passage is provided independently, and the middle of the second lubricating oil passage is opened and closed by a valve body 37. When the compression operation of the compression chamber 7 is stopped, the second lubricating oil passage is closed by the valve body 37. Lubricating oil flowing into the compression chamber 7 is suppressed to a necessary minimum. For this reason, in this embodiment, it is not necessary to compress a large amount of lubricating oil in the compression chamber 7 when the compression operation is restarted. Even if a special check valve is not provided in the suction port connecting the suction pipe, the abnormal sound due to the vane 10 at the time of stopping the compression can be prevented.

In this embodiment, even if the valve body 37 stops in a closed state for some reason, the first lubricating oil passage allows the lubricating oil in the oil sump 17 to flow through the rotor 8. Since the lubricating oil is supplied to the bearings 4a and 5a to secure the sliding portion, it is possible to prevent the bearings 4a and 5a from being burned. Further, in this embodiment, since the configuration for realizing the above functions is relatively easy,
That function can be realized at low cost.

[0021]

As described above, in the gas compressor of the present invention, the first lubricating oil passage for supplying the lubricating oil in the oil reservoir to the bearing, and the lubricating oil in the oil reservoir via the bottom of the vane groove or the rotor side. in a second lubricating oil passage for supplying the compression chamber is provided, the compression operation at the time of stopping the second lubricating oil passage in the closed state, so the lubricating oil is not supplied to the compression chamber, simultaneous
To ensure the supply of lubricating oil to the rotor bearings
did. Therefore, via the vane groove bottom and the rotor side
The supply of lubricating oil to the compression chamber was stopped, and a large amount of
Lubricating oil does not flow. Therefore, according to the present invention, it is not necessary to compress a large amount of lubricating oil in the compression chamber when the compression operation is restarted, so that the starting torque can be reduced when the compression operation is restarted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an overall configuration of a gas compressor according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an operation of the gas compressor during gas compression.

FIG. 3 is a diagram illustrating an operation of the gas compressor when gas compression is stopped.

FIG. 4 is a cross-sectional view showing the overall configuration of a conventional gas compressor.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

[Explanation of symbols]

 Reference Signs List 3 compressor body 4 front side block 5 rear side block 6 cylinder 7 compression chamber 8 rotor 10 vane 12 suction chamber 16 discharge chamber 17 oil sump 21, 24, 25 lubricating oil passage 31 oil separator block 32, 35 lubricating oil passage 33 valve Chamber 34 Ring groove 37 Valve element 37a Concave groove 39 Compression coil spring

Claims (3)

(57) [Claims] A compression chamber for compressing gas by 1. A volume change accompanying the rotational motion of the rotating body, and a discharge chamber for discharging the gas after compression in the compression chamber, and an oil reservoir in which the pressure of the discharge chamber acts, A first lubricating oil passage connecting the oil sump to the bearing of the rotating body and supplying the lubricating oil of the oil sump to the bearing by the pressure of the discharge chamber; and a rotating body in the oil sump and the compression chamber. A second lubricating oil passage for supplying the lubricating oil in the oil sump to the rotating body in the compression chamber by the pressure of the discharge chamber; and a second lubricating oil passage interposed in the middle of the second lubricating oil passage. And a lubricating oil passage opening / closing means for closing the second lubricating oil passage when compression of the compression chamber is stopped. The lubricating oil passage opening / closing means comprises: Interposed in the middle of the second lubricating oil passage, (2) a valve element for opening and closing the lubricating oil passage; and a valve body for guiding and causing the jet of the gas discharged from the compression chamber to act directly upon operation of the compression chamber during operation of the compression chamber. Gas collision means for opening the second lubricating oil passage; and when the gas discharged from the compression chamber does not collide with the valve body when the operation of the compression chamber is stopped , the valve body is provided with the second lubricating oil passage. And a resilient member for closing the gas compressor. 2. The rotating body comprises a rotor and a vane housed in a vane groove provided in a radial direction of the rotor, wherein the second lubricating oil passage is provided at the bottom of the oil reservoir and the vane groove. Connected to the side of the rotor, the discharge chamber and the compression chamber
The gas compressor according to claim 1, wherein the lubricating oil in the oil sump is supplied to a bottom of the vane groove or a side surface of the rotor by a pressure difference . 3. When the lubricating oil passage opening / closing means closes the second lubricating oil passage, the lubricating oil in the oil reservoir is transferred to the first lubricating oil passage by a pressure difference between the discharge chamber and the compression chamber. 3. The gas compressor according to claim 1, wherein the lubricating oil is supplied to a bearing of the rotor via a shaft, and the lubricating oil flows into the compression chamber.