JPH11148478A - Gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with the grooving for fixing a damping material and improve the workability in assembling of the damping material by fixing the damping material for softening the collision of a valve element and a valve chest on one of a collision side of the valve element and a side to be collided in the valve chest, when the valve element opens an oil passage by the discharged gas from compression chamber. SOLUTION: A damping material 41 made of a thin plate-shaped ring, is adhered to a flat part of an opening edge of a spring housing part 36 of a valve element 31 forming an oil passage switch 28. Further the flat part of the opening edge is coated with the damping material 41 with a specific thickness. Any material can be used as the damping material 41 so long as it is superior in the heat resistance and the oil resistance and has the function for preventing the noise and the abrasion when the valve element 31 collides with an inner face at a through hole 35 side, of the valve chest 30. For example, a synthetic resin such as flour rubber, silicone rubber and urethane rubber, or a Teflon material (fluororesin amterial) can be preferably used.

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, as an example of a gas compressor, FIGS.
The one described in FIG. 9 is known. This gas compressor
As shown in FIG. 7, a configuration is adopted in which an opening end of a casing 1 is closed by a front head 2 and a compressor main body 3 is housed in the casing (outer case) 1. The compressor body 3 includes a cylinder 6 having both ends open, and a front side block 4 and a rear side block 5 are attached to both ends of the cylinder 6, respectively.
The front side block 4 and the rear side block 5 form an elliptic cylindrical compression chamber 7 as shown in FIG.

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. 8, 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 compression 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 compression chamber 7 by the centrifugal force and the oil pressure at the bottom of the vane groove 9 (back pressure space of the vane 10) 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 15 formed in the thickness direction of the rear side block 5, and the discharge passage 15 is connected to a discharge passage 16 formed between the rear side block 5 and the block 17 for the oil separator. The end of the discharge passage 16 is connected to an oil separator 18 formed above the oil separator block 17.

[0005] The oil separator 18 has a cylindrical filter (wire mesh) provided in a cylindrical portion having an opening. The discharge port of the oil separator 18 faces the discharge chamber 20. An oil reservoir 21 for storing lubricating oil is formed at the bottom of the discharge chamber 20. The lubricating oil in the oil sump 21 is supplied to an oil passage 22 (see FIG. 9) provided in the oil separator block 17,
It is configured to be supplied to the bottom of the vane groove 9, which is the back pressure space of the vane 10, via the oil passage 23 provided in the rear side block 5, the bearing 5 a, and the back pressure groove 24. After the lubricating oil branches off from the middle of the oil passage 23, the lubricating oil passes through an oil passage 25 provided in the cylinder 6, an oil passage 26 provided in the front side block 4, a bearing 4 a, and a back pressure groove 27. It is configured to be supplied to the bottom of the vane groove 9 which is the back pressure space of 10.

As shown in FIG. 9, an oil passage switch 28 for opening and closing the oil passage 22 is provided in the middle of the oil passage 22 provided in the oil separator block 17 made of aluminum. As shown in FIG. 9, this oil passage switch 28
A cylindrical valve chamber 30 intersecting with the oil passage 22 is provided, and a valve body 31 made of aluminum is slidably provided in the length direction of the valve chamber 30. The valve chamber 30
As shown in FIG. 9, the valve chamber 3 on the oil separator block 17 side is used.
0a and the valve chamber 30b on the rear side block 5 side, the valve chamber 30a side is connected to the oil reservoir 21 through the through hole 35, and the valve chamber 30b forms a part of the discharge passage 15. It is configured as follows.

The valve body 31 is a cylindrical body having a bottom surface, and a concave groove 32 is formed in a part of the body portion in a circumferential direction so as to engage with the oil passage 22 to form an oil passage. ing. The outside of the bottom surface (pressure receiving surface) 33 of the valve element 31 faces the middle of the discharge passage 15, and is configured so that the discharge gas jet immediately after discharge from the compression chamber 7 directly acts. Inside the valve body 31, a spring storage portion 36 which is formed in a cylindrical shape and stores the compression coil spring 34 is formed. A compression coil spring 34 that constantly urges the valve element 31 toward the discharge passage 15 is stored in the spring storage section 36. One end of the compression coil spring 34 contacts the bottom of the spring housing 36, and the other end is locked by a spring stopper 37 formed adjacent to the through hole 35 of the valve chamber 30. A concave groove 38 having a concave cross section in the circumferential direction is formed on the inner peripheral surface of the valve chamber 30 and adjacent to the spring stopper 37. A ring-shaped rubber cushioning member 39 is formed in the concave groove 38 to prevent abrasion and noise generated when the valve body 31 collides with the side surface of the valve chamber 30 on the side of the through hole 35. Mated.

Next, the operation of the conventional gas compressor having such a configuration will be described. When the rotor 8 starts rotating, the low-pressure refrigerant gas is supplied from the suction chamber 12 to the compression chamber 7.
And the sucked gas is compressed as the vane 10 rotates. Thus, when the compression chamber 7 starts the compression operation and the high-pressure refrigerant gas is discharged, the discharged refrigerant gas passes through the discharge passage 15 and passes through the bottom surface 33 of the valve element 31.
9A, the valve body 31 comes to the position shown in FIG. 9A against the force of the compression coil spring.

As a result, during the period from the start of compression of the compression chamber 7 to the stop of compression, the concave groove 32 of the valve body 31 is
And the oil passage 22 is opened. At this time,
A pressure difference is generated between the suction chamber 12 or the compression chamber 7 and the discharge chamber 20 such that the discharge chamber 20 has a high pressure and the suction chamber 12 or the compression chamber 7 has a low pressure. Therefore, the lubricating oil in the oil sump 21 is supplied to the oil passage 22, the oil passage 23, the bearing 5a, the back pressure groove 24.
And supplied to the bottom of the vane groove 9 and then into the compression chamber 7. Further, the lubricating oil branched from the oil passage 23 is supplied to the oil passage 25, the oil passage 26, the bearing 4a,
After being supplied to the bottom of the vane groove 9 via the back pressure groove 27, it is supplied into the compression chamber 7. The refrigerant gas discharged from the compression chamber 7 and acting on the bottom surface 33 of the valve element 31 is discharged from the discharge passage 1
6. The oil flows into the discharge chamber 20 via the oil separator 18. At this time, the oil separator 18 separates oil from the high-pressure refrigerant gas,
The separated oil is collected in an oil sump 21 at the bottom of the discharge chamber 20.
To fall.

On the other hand, when the compression operation of the compression chamber 7 stops,
Since the high-pressure refrigerant gas is not discharged from the compression chamber 7,
The action of the refrigerant gas on the bottom surface 33 of the valve body 31 stops, and the valve body 31 is brought to the position shown in FIG. For this reason, when the compression of the compression chamber 7 is stopped, the valve body 31 closes the oil passage 22 as shown in FIG. Or into the suction chamber 12. As a result, when the compression operation is restarted, the amount of lubricating oil sucked into the compression chamber 7 from the suction chamber 12 can be reduced as much as possible, and oil compression in the compression chamber 7 during startup can be prevented. Can be reduced.

[0011]

By the way, in the conventional gas compressor, as described above, the concave groove 38 for fitting the cushioning material 39 made of a ring-shaped rubber (having a circular or rectangular cross section). On the inner peripheral surface of the valve chamber 30. Therefore, there is an inconvenience that the processing of the concave groove 38 is troublesome and expensive. Further, in order to fit the buffer member 39 into the concave groove 38 and fix it, the outer diameter of the buffer member 39 is configured to be larger than the inner diameter of the concave groove 38. Therefore, when assembling the cushioning material 39 into the concave groove 38, it is necessary to once compress the cushioning material 39 and push it into the concave groove 38. The cushioning member 39 must be securely fixed without protruding from the inside of the concave groove 38, and there is a disadvantage that its workability (assembly property) is poor.

Accordingly, the present invention provides a gas compressor which eliminates a groove for fixing a cushioning material used for an oil passage opening / closing means and improves the workability of assembling the cushioning material. It is in.

[0013]

In order to achieve the above object, the present invention provides a compression chamber 7 for compressing a gas by a change in volume caused by a rotational movement of a rotating body, and a gas compressed by the compression chamber 7 for compressing the gas. The discharge chamber 20 for discharging, the oil sump 21 on which the pressure of the discharge chamber 20 acts, and the oil sump communicate with the sliding portion of the rotating body of the compression chamber 7, and the pressure between the discharge chamber 20 and the compression chamber 7 is increased. Due to the difference, an oil passage for supplying the lubricating oil in the oil sump 21 to the sliding portion, a cylindrical valve chamber 30 interposed in the middle of the oil passage, and a longitudinal direction of the valve chamber in the valve chamber 30 Valve body 31 slidably disposed to open and close the oil passage
And the elastic member storage portion (spring storage portion 36) of the valve element 31.
An elastic member (compression coil spring 3) that always accommodates one end side and locks the other end side to the longitudinal inner surface in the valve chamber 30 to constantly urge the valve body 31 in the direction in which the oil passage closes.
4), the gas discharged from the compression chamber 7 is displaced from the valve body 3 so that the valve body 31 opens the oil passage against the force of the elastic member.
And a gas passage leading to the pressure receiving surface of the first pressure receiving surface, and a cushioning material 41 for mitigating a collision between the valve body 31 and the valve chamber 31 when the valve body 31 opens the oil passage by gas discharged from the compression chamber 7.
Is fixed to one of the collision portion side of the valve body 31 and the collision portion side in the valve chamber 30.

The cushioning member 41 is stored and fixed in the cushioning member storage portion 42a of the cushioning member receiver 42, and the press-fitting portion 42b of the buffering material receiver 42 is press-fitted inside the opening of the elastic member storing portion of the valve body 31. Is also good.

As described above, according to the present invention, the cushioning member for mitigating the collision between the valve body and the valve chamber is fixed to one of the collision part side of the valve body and the collision part side of the valve chamber. Therefore, it is not necessary to form a groove for fixing the cushioning material, and the workability in assembling the cushioning material can be improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. FIG.
FIG. 2 is a cross-sectional view illustrating a configuration of an oil passage switch in the gas compressor according to the first embodiment of the present invention. FIG.
Shows a cross-sectional view and a left side view of the valve body shown in FIG. In the first embodiment, as shown in FIGS. 1 and 2, a buffer made of a thin plate-like ring is provided on a flat portion of an opening edge of a spring housing portion 36 of a valve body 31 constituting an oil passage switch 28. The material 41 is adhered or the cushioning material 41 is coated on the flat surface of the opening edge to a predetermined thickness. As the cushioning material 41, any material may be used as long as it has high heat resistance and oil resistance and has a function of preventing noise and wear when the valve body 31 collides with the inner surface of the valve chamber 30 on the side of the through hole 35. The material does not matter. For example, fluoro rubber,
In addition to synthetic rubber such as silicone rubber and urethane rubber,
Teflon material (fluororesin material) or the like is preferable. In addition,
The configuration of another part of the first embodiment is shown in FIGS.
Since it is the same as the conventional gas compressor shown in FIG.

With such a configuration, in the first embodiment, a concave groove 38 as shown in FIG. 9 is provided on the inner peripheral surface of the valve chamber 30, and a cushioning material 39 is fitted into the concave groove 38. Eliminates the need. For this reason, in the first embodiment, the conventional groove processing for fixing the cushioning material 41 can be omitted, and when the cushioning material 41 is assembled, the inside of the valve chamber 30 is conventionally disposed inside. Since it is not performed on the device, workability during the assembly can be remarkably improved.

Next, a first modification of the first embodiment will be described with reference to FIG. In the first embodiment, the cushioning member 41 is fixed to the valve body 31 by bonding or the like. However, the bonding may be difficult depending on the material of the cushioning member 41 or the like. Therefore, in the first modified example, as shown in FIG. 3, the buffer material 41 is fixed to one end of the buffer material receiver 42 by means other than bonding, and the other end of the buffer material receiver 42 is connected to the valve body 31. And is fixed to the valve body 31 by press-fitting into the inside of the opening of the spring storage portion 36. That is, the cushioning material receiver 42 has a short cylindrical press-fitting portion 42 a that is press-fitted inside the opening of the spring housing portion 36 of the valve element 31,
and a short cylindrical buffer material storage portion 42b for storing and fixing the buffer material 41. In the first modification having such a configuration, the cushioning material 41 can be stored and fixed in advance in the cushioning material storage portion 42b of the cushioning material receiver 42, and the press-fitting portion 42a can be stored in the spring storage space of the valve body 31. By press fitting inside the opening of the portion 36, the cushioning material 41 can be fixed to the valve body 31 without using an adhesive.

Next, a second modification of the first embodiment will be described with reference to FIG. As shown in FIG. 4, this second modification is different from the ring-shaped cushioning material 41 shown in FIGS.
Is used. As this gasket 43,
A heat-resistant and oil-resistant soft ring (such as rubber) 43a made of a thin ring and a heat-resistant and oil-resistant thin ring (such as aluminum) 43b made of a thin ring are joined in advance. Are preferred.
Then, the metal hard ring 43b is fixed to the flat surface of the opening edge of the spring housing portion 36 of the valve body 31 by bonding. In the second modified example having such a configuration, a commercially available gasket can be used as the cushioning material 41, which is convenient, and the joining with the valve body 31 is relatively easy since it is made of metal.

Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, as shown in FIG. 5, a buffer member 41 made of a thin plate-like ring is bonded to the side surface of the valve chamber 30 constituting the oil passage switch 28 on the side of the through hole 35, Alternatively, the cushioning material 41 is coated on the side surface to a predetermined thickness. With such a configuration, in the second embodiment,
A concave groove 38 as shown in FIG. 9 is provided on the inner peripheral surface of the valve chamber 30, and there is no need to fit the cushioning material 39 into the concave groove 38. For this reason, in the second embodiment, the cushioning material 41
Can be omitted, and the ease of assembling the cushioning material 41 can be improved.

Next, a modification of the second embodiment will be described with reference to FIG. In the above-described second embodiment, the cushioning member 41 is fixed to the side surface of the valve chamber 30 on the side of the through hole 35 by bonding or the like. However, the bonding may be difficult depending on the material of the cushioning member 41 or the like. Therefore, in this modified example, as shown in FIG. 6, the buffer material 41 is fixed to one end of the buffer material receiver 45 by means other than bonding, and the other end of the buffer material receiver 45 is connected to the through hole of the valve chamber 30. The spring stopper 37 formed adjacent to the inner periphery 35 is press-fitted into the inner periphery and fixed to the valve body 31. That is, the cushioning material receiver 45
Is a short cylindrical press-fitting portion 45a press-fitted into the inner peripheral portion of the spring stopper portion 37, and a short cylindrical buffer material storage portion 45b following the press-fitting portion 45a and storing and fixing the buffer material 41.
Consists of In a modified example having such a configuration,
The cushioning material 41 can be stored and fixed in the cushioning material storage portion 45b of the cushioning material receiver 45 in advance.
a into the inner peripheral portion of the spring stopper 37,
1 can be fixed in the valve chamber 30 without using an adhesive.

[0022]

As described above, according to the present invention, the cushioning member for reducing the collision between the valve body and the valve chamber is provided on one of the collision portion side of the valve body and the colliding portion side of the valve chamber. I fixed it. Therefore, it is not necessary to form a groove for fixing the cushioning material, and the workability in assembling the cushioning material can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of an oil passage switch in a gas compressor according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a cross section and a left side surface of the valve body shown in FIG.

FIG. 3 is a cross-sectional view illustrating a first modification of the first embodiment.

FIG. 4 is a cross-sectional view showing a second modification of the first embodiment.

FIG. 5 is a sectional view showing a configuration of a part of an oil passage switch according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a modification of the second embodiment.

FIG. 7 is a cross-sectional view showing the entire configuration of a conventional gas compressor.

FIG. 8 is a sectional view taken along line AA of FIG. 7;

FIG. 9 is a cross-sectional view showing a configuration of a conventional oil passage switch.

[Explanation of symbols]

 Reference Signs List 3 compressor body 4 front side block 5 rear side block 6 cylinder 7 compression chamber 8 rotor 20 discharge chamber 21 oil sump 23, 25, 26 oil passage 30 valve chamber 31 valve body 34 compression coil spring 35 through hole 36 spring storage part 41 buffer material 42 buffer material receiver 42a press-fit portion 42b buffer material storage portion 43 gasket 43a soft ring 43b hard ring

Claims (2)

[Claims] A compression chamber for compressing a gas by a volume change caused by a rotational movement of a rotating body; a discharge chamber for discharging the compressed gas in the compression chamber; an oil reservoir on which the pressure of the discharge chamber acts; An oil passage for communicating the oil sump and a sliding portion of the rotating body of the compression chamber with a pressure difference between the discharge chamber and the compression chamber to supply lubricating oil of the oil sump to the sliding portion; A cylindrical valve chamber interposed in the middle of the oil passage; a valve body slidably disposed in the valve chamber in a length direction of the valve chamber to open and close the oil passage; An elastic member for storing one end side in an elastic member storage portion of the body, and locking the other end side to an inner surface in a longitudinal direction of the valve chamber, and constantly biasing the valve body in a direction in which the oil passage is closed. The valve body opens the oil passage against the force of the elastic member. A gas passage for guiding gas discharged from the compression chamber to the pressure receiving surface of the valve body, wherein when the valve body opens the oil passage by gas discharged from the compression chamber, the valve body and A gas compressor, characterized in that a cushioning member for mitigating a collision with the valve chamber is fixed to one of a collision part side of the valve body and a collision part side of the valve chamber. 2. The cushioning member according to claim 1, wherein said cushioning member is accommodated and fixed in a cushioning material storage portion of a cushioning material receiver, and a press-fit portion of said cushioning material receiver is press-fitted into an opening of an elastic member storage portion of said valve body. Item 2. The gas compressor according to Item 1.