JP3562136B2 - Gas compressor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas compressor, for example, to a variable displacement gas compressor used for air conditioning equipment of automobiles and the like.
[0002]
[Prior art]
FIG. 6 shows a cross section of a conventional variable displacement gas compressor. FIG. 7 is a sectional view taken along line AA of FIG.
As shown in FIG. 6, the gas compressor employs a configuration in which an open end of a casing 1 is closed by a front head 2 and a compressor main body 3 is housed in the casing 1.
The compressor 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. The cylinder 6, the front side block 4, and the rear side block 5 shown in FIG. Such an elliptical cylindrical cylinder chamber 7 is formed.
[0003]
A rotor 8 is rotatably housed in the cylinder chamber 7. 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 the bearing 4a of the front side block 4 and the bearing 5a of the rear side block 5.
As shown in FIG. 7, a plurality of (five) vane grooves 9 for accommodating the vanes 10 are provided in the radial direction of the rotor 8, and the vane 10 is provided in each of the vane grooves 9 with the inner peripheral surface of the cylinder chamber 7. It is stored so that it can appear and disappear freely. The vane 10 is urged against the inner peripheral surface of the cylinder chamber 7 by the centrifugal force and the hydraulic pressure at the bottom of the vane groove 9 when the rotor 8 rotates.
[0004]
The suction port of the cylinder chamber 7 is configured to be able to communicate with the suction chamber 12 via the front side block suction port.
Further, discharge valves 14, 14 are provided at the discharge ports 13, 13 of the cylinder chamber 7. The discharge ports 13, 13 communicate with a discharge passage 19 formed in the thickness direction of the rear side block 5, and the end of the discharge passage 19 is connected to an oil separator 15 integrally attached to the discharge chamber 16 side of the rear side block 5. It is connected to the.
In the oil separator 15, a passage communicating with the discharge passage 19 is formed, and a cylindrical filter (wire mesh) is provided at the end of the passage. The discharge port of the oil separator 15 faces the discharge chamber 16.
An oil reservoir 17 for storing the lubricating oil separated by the oil separator 15 is formed at the bottom of the discharge chamber 16. The lubricating oil in the oil reservoir 17 is configured to be supplied to sliding parts such as the bearings 4a and 5a via the oil passage 18.
[0005]
In the conventional gas compressor having such a configuration, the low-pressure refrigerant gas is sucked into the cylinder chamber 7 from the suction chamber 12 by the rotation of the rotor 8, and the sucked gas is compressed with the rotation of the vane 10. .
The compressed gas is discharged to the discharge chamber 16 via the discharge ports 13, 13 of the cylinder chamber 7, the discharge valves 14, 14, the discharge passage 19, and the oil separator 15. At the time of this discharge, the oil separator 15 separates oil from high-pressure refrigerant gas, and the separated oil falls into an oil sump 17 at the bottom of the discharge chamber 16.
[0006]
On the other hand, a pressure difference is generated between the suction chamber 12 or the cylinder chamber 7 and the discharge chamber 16 such that the discharge chamber 16 has a high pressure and the suction chamber or the cylinder chamber 7 has a low pressure. Therefore, due to this pressure difference, the lubricating oil in the oil reservoir 17 is supplied to the sliding parts such as the bearings 4a and 5a via the oil passage 18.
The lubricating oil supplied to the sliding part finally flows into the suction chamber 12 on the low pressure side, becomes a mist in the low pressure refrigerant gas in the suction chamber 12, is sucked into the cylinder chamber 7, and is together with the refrigerant gas. Compressed.
[0007]
[Problems to be solved by the invention]
By the way, in the conventional gas compressor, the opening area of the discharge port (gas discharge port) of the oil separator 15 is narrowed to reduce the discharge pulsation of the discharge gas.
In order to reduce the discharge pulsation, a greater effect is obtained as the opening area of the discharge port of the oil separator 15 is reduced, but the performance is reduced due to an increased pressure loss. This decrease in performance is more remarkable as the gas compressor is operated at a higher rotation speed and the flow rate of the refrigerant gas is larger.
[0008]
Therefore, an object of the present invention is to provide a gas compressor capable of reducing the discharge pulsation of the refrigerant gas discharged from the gas compression section without lowering the performance.
[0009]
[Means for Solving the Problems]
In the first aspect of the present invention, a gas compression chamber for compressing gas by volume change accompanying the rotational motion of the rotating body, and a gas discharge passage connected to the discharge side of the gas compression chamber, compressed gas from the gas discharge passage And a discharge valve that opens and closes a discharge hole communicating the gas compression chamber and the gas compression passage, and discharge from the gas compression chamber provided on a discharge port side of the gas discharge passage. An oil separator for separating oil in a gas to be supplied, an opening / closing member slidably provided at the discharge port to open and close the discharge port of the oil separator, and an opening area of the discharge port of the oil separator An elastic member that constantly urges the opening and closing member, and slides the opening and closing member so that the discharge port of the oil separator keeps a predetermined opening area when the gas compressor is stopped. Regulating means for regulating, the opening and closing member The against the action of the gas discharged from the compression chamber to the urging of the elastic member, by sliding the opening area of the oil separator of the discharge port is increased, to achieve the above object.
[0010]
According to a second aspect of the present invention, in the gas compressor according to the first aspect , the elastic member is one of a compression coil spring and a tension coil spring.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a cross-sectional view showing the overall configuration of the gas compressor according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating a configuration of an oil separator of the gas compressor. FIG. 3 is a cross-sectional view illustrating the operation of the oil separator during operation of the gas compressor.
Since the first embodiment has the same components as those of the conventional gas compressor shown in FIG. 6, the same components will be omitted or simplified in the following description.
[0012]
In the gas compressor according to the first embodiment, as shown in FIG. 1, an oil separator 21 connected to the end of a discharge passage 19 communicating with the cylinder chamber 7 is provided integrally with the rear side block 5. .
The oil separator 21 is formed by an oil separator block 22 integrally connected to the rear side block 5.
A passage 23 is provided in the oil separator block 22 in a thickness direction thereof, and a start end of the passage 23 is connected to an end of a discharge passage 19 formed in the rear side block 5. At the end of the passage 23, a cylinder 24 that projects laterally from the discharge chamber 16 is provided integrally.
[0013]
A plurality of round holes, long holes, and the like are formed on the lower side of the peripheral wall of the cylinder 24 and on the side of the passage 23, and this is used as a discharge port 25 of the oil separator 21. Further, a spool 26 as an opening / closing member for opening / closing the discharge port 25 is slidably provided in the longitudinal direction inside the cylinder 24. This spool 26 is formed of a cylinder having a bottom.
A stopper 27 that restricts the movement of the spool 26 toward the passage 23 protrudes from the inner peripheral wall of the cylinder 24 in the circumferential direction and near the center in the length direction of the discharge port 25. Further, a compression coil spring 29 is interposed between the spool 26 and the inside of the case 28, and the compression coil spring 29 constantly urges the spool 26 toward the passage 23 so as to close the discharge port 25. Sliding toward the passage 23 is restricted by the stopper 27.
[0014]
In addition, the entire outer periphery of the cylinder 24 except the opening on the terminal end side is covered with a cylindrical wire net 30. Further, the entire outer periphery of the wire mesh 30 except for a portion corresponding to the discharge port 25 of the cylinder 24 is covered with a case 28. Accordingly, the discharge port 25 of the cylinder 24 communicates with the discharge chamber 16 while being covered with the wire mesh 30.
The case 28 is attached to the oil separator block 22 by detachable bolts 31. Therefore, by removing the bolt 31, the wire net 30 can be easily cleaned or replaced as necessary.
[0015]
Next, the operation of the first embodiment configured as described above will be described with reference to the drawings.
First, when the operation of the gas compressor is stopped, the compressed refrigerant gas from the cylinder chamber 7 does not flow into the oil separator 21, so that the spool 26 is urged by the compression coil spring 29, as shown in FIG. It is in a state of being positioned by the stopper portion 27. Therefore, at this time, the opening area of the discharge port 25 is in a minimum state.
[0016]
Next, when the operation of the gas compressor is started and the rotor 8 starts rotating, the low-pressure refrigerant gas in the suction chamber 12 is sucked into the cylinder chamber 7 by the rotation of the rotor 8, and the sucked refrigerant gas is It is compressed as the vane 10 rotates.
The compressed gas is discharged from the discharge ports 13, 13 of the cylinder chamber 7 and then flows into the oil separator 21 via the discharge valves 14, 14 and the discharge passage 19.
When the refrigerant gas flows into the passage 23 of the oil separator 21, the refrigerant gas collides with the bottom of the spool 26, and the spool 26 is opposed to the passage 23 against the force of the compression coil spring 29, as shown in FIG. It is pushed to the side and slid. As a result, the opening area of the discharge port 25 increases from the minimum state, and the amount of the increase is proportional to the flow rate and the flow velocity of the refrigerant gas impinging on the bottom of the sproll 26.
The refrigerant gas that has collided with the bottom of the spool 26 is discharged to the discharge chamber 16 through the discharge port 25 and the wire netting 30. At the time of this discharge, the oil in the refrigerant gas adheres to the wire netting 30 and then enters the oil reservoir 17. Fall.
[0017]
In the first embodiment described above, for example, when the flow rate of the refrigerant gas is small, the force applied to the spool 26 by the refrigerant gas is small, so that the opening area of the discharge port 25 is small. On the other hand, when the flow rate of the refrigerant gas is large, the force applied to the spool 26 by the refrigerant gas is large, so that the opening area of the discharge port 25 increases. Therefore, it is possible to reduce the pulsation of the discharge of the refrigerant gas without lowering the performance of the gas compressor.
[0018]
Next, a second embodiment of the present invention will be described with reference to FIGS.
FIG. 4 is a cross-sectional view illustrating a configuration of the oil separator according to the second embodiment. FIG. 5 is a cross-sectional view illustrating the operation of the oil separator.
In the second embodiment, the oil separator 21 in the first embodiment is replaced with an oil separator 40 as shown in FIG.
[0019]
That is, in the second embodiment, the compression coil spring 29 in the first embodiment is replaced with a tension coil spring 41 as shown in FIG.
One end of the tension coil spring 41 is attached to the bottom of the spool 26, and the other end is attached to a spring stopper 42 provided on the start end side in the passage 23.
Accordingly, the spool 26 is constantly urged toward the passage 23 so as to close the discharge port 25 by the tension coil spring 41, and the sliding of the spool 26 toward the passage 23 is restricted by the stopper 27.
Note that the other configuration of the second embodiment is the same as that of the first embodiment, and a description thereof will be omitted.
[0020]
Next, the operation of the second embodiment configured as described above will be described with reference to the drawings.
First, when the operation of the gas compressor is stopped, since the compressed refrigerant gas from the cylinder chamber 7 does not flow into the oil separator 21, the spool 26 is pulled by the tension coil spring 41 and is positioned at the stopper 27. It is in. Therefore, at this time, as shown in FIG. 4, the opening area of the discharge port 25 is in a minimum state.
[0021]
Next, during operation of the gas compressor, the compressed refrigerant gas discharged from the cylinder chamber 7 flows into the oil separator 21.
When the refrigerant gas flows into the passage 23 of the oil separator 21, the refrigerant gas collides with the bottom of the spool 26, and the spool 26 is opposed to the passage 23 against the force of the tension coil spring 41, as shown in FIG. It is pushed to the side and slid. As a result, the opening area of the discharge port 25 increases from the minimum state, and the amount of the increase is proportional to the flow rate and the flow velocity of the refrigerant gas impinging on the bottom of the sproll 26.
[0022]
In the embodiment described above, the discharge port 25 provided in the cylinder 24 is configured to be opened by a predetermined amount when the operation of the gas compressor is stopped. 26, the discharge port 25 may be opened by sliding the spool 26 in accordance with the flow rate of the gaseous gas only during the operation.
Further, in the above-described embodiment, the entire outer periphery of the cylinder 24 is covered with the wire netting 30. Alternatively, only the discharge port 25 of the cylinder 24 may be covered.
[0023]
【The invention's effect】
As described above, in the gas compressor of the present invention, when the gas compressor is stopped, the sliding of the opening / closing member is regulated so that the discharge port of the oil separator keeps a predetermined opening area, Since the opening area of the discharge port of the discharge passage is changed according to the flow of the gas discharged from the gas compression chamber, the discharge pulsation of the refrigerant gas discharged from the gas compression chamber without lowering the performance. Can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating an entire configuration of a gas compressor according to a first embodiment of the present invention.
FIG. 2 is a sectional view showing a configuration of an oil separator of the gas compressor.
FIG. 3 is a sectional view illustrating the operation of the oil separator.
FIG. 4 is a cross-sectional view illustrating a configuration of an oil separator according to a second embodiment of the present invention.
FIG. 5 is a sectional view illustrating the operation of the oil separator.
FIG. 6 is a cross-sectional view showing the entire configuration of a conventional gas compressor.
FIG. 7 is a sectional view taken along line AA of FIG. 6;
[Explanation of symbols]
3 compressor body 4 front side block 5 rear side block 6 cylinder 7 cylinder chamber 8 rotor 10 vane 12 suction chamber 13 discharge port 14 discharge valve 16 discharge chamber 19 discharge passage 21, 40 oil separator 22 oil separator block 23 passage 24 cylinder 25 Discharge port 26 Sproll 27 Stopper part 28 Case 29 Compression coil spring 30 Wire net 41 Pulling coil spring 42 Spring stopper

Claims (2)

A gas compression chamber that compresses gas by a volume change accompanying the rotational movement of the rotating body ,
A gas discharge passage connected to the discharge side of the gas compression chamber ,
A discharge chamber from which a compressed gas is discharged from the gas discharge passage;
A discharge valve that opens and closes a discharge hole communicating the gas compression chamber and the gas compression passage,
An oil separator provided on the discharge port side of the gas discharge passage, for separating oil in gas discharged from the gas compression chamber,
An opening and closing member slidably provided at the discharge port to open and close the discharge port of the oil separator;
An elastic member that constantly urges the open / close member so that the opening area of the discharge port of the oil separator is small;
Regulating means for regulating the sliding of the opening and closing member so that the discharge port of the oil separator keeps a predetermined opening area when the gas compressor is stopped,
With
The gas is characterized in that the opening and closing member slides so as to increase the opening area of the discharge port of the oil separator, against the bias of the elastic member by the action of the gas discharged from the compression chamber. Compressor. The elastic member is a gas compressor according to claim 1, wherein a is either compression coil springs or tension coil spring.

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