JPH08177768A - Vane type compressor - Google Patents

Abstract

PURPOSE: To prevent abrasion and seizure between a rear side end surface of a rotor and a rotor side end surface of a rear side member at starting time by arranging a groove, which sends high pressure supplied through a vane back pressure chamber between the rear side end surface of the rotor and the rotor side end surface, on the rotor side end surface of the rear side member. CONSTITUTION: An annular groove 23 is arranged on a rotor side end surface of a movable plate 4 opposed to a rear side end surface of a rotor 2 of a vane type compressor. This annular groove 23 has a large diameter groove part 23a communicated with a vane back pressure chamber 13a existing in a section up to the vicinity of a finish position of a compression stroke from a start position of a suction stroke. A high pressure introducting passage 24 to communicate a delivery chamber 10 with the vane back pressure chamber 13a is arranged in a front side block 3, and an opening-closing valve 25 to open the high pressure introducing passage 24 when pressure of the delivery chamber 10 does not reach a prescribed value, is arranged in the middle of it. Therefore, when the compressor is started, slidingly movable surface pressure between the rear side end surface and the rotor side end surface is reduced by high pressure fluid from the annular groove 23, and abrasion is restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane type compressor, and more particularly to a vane type compressor capable of preventing wear and seizure between a rotor and a rear side block.

[0002]

2. Description of the Related Art FIG. 4 is a vertical sectional view showing a conventional vane type compressor.

As a conventional vane type compressor, as shown in FIG. 4, a rotor 102 is rotatably housed in a cam ring 101, and a plurality of vane grooves are provided in the rotor 102 in a substantially radial direction. Vane back pressure chamber 1 at the bottom
13a is provided, the vane 114 is slidably inserted into each vane groove, and a discharge port 119 for discharging the refrigerant gas in the compression chamber formed between the vanes 114 is provided in the cam ring 101, and fixed to both end surfaces of the cam ring 101. Back pressure grooves 123 communicating with the vane back pressure chambers 113a are provided on the rotor-side end faces of the front side block 103 and the rear side block 104, respectively, and a high pressure is sent to the vane back pressure chambers 113a through these back pressure grooves 123, so that the vanes There is one in which the vane 114 is easily ejected from the groove.
As a vane type compressor of this type, for example, Japanese Patent Application Laid-Open No. 2-24
There is one described in Japanese Patent No. 8682.

A front head 105 is fixed to the front side block 103, and the front side block 1
03 and the front head 105 form a discharge chamber 110, the rear head 106 is fixed to the rear side block 104, and the rear side block 104 and the rear head 10
6 and 6, the suction chamber 111 is formed. The front side block 103 is provided with a high-pressure introducing passage 124 that communicates the discharge chamber 110 with the back pressure groove 123. The high-pressure introducing passage 124 has a high-pressure introducing passage when the pressure in the discharge chamber 110 does not reach a predetermined value. A trigger valve 125 is attached which opens 124 and closes the high pressure introduction passage 124 when the pressure in the discharge chamber 110 reaches a predetermined value.

At the time of starting the compressor (when an electromagnetic clutch (not shown) is turned on), the trigger valve 125 is kept open until the pressure in the discharge chamber 110 reaches a predetermined value, and the trigger valve 125 is opened via the high pressure introducing passage 124. The high pressure of the discharge chamber 110 is the back pressure groove 1
23, and the vane back pressure chamber 11 from the back pressure groove 123.
High pressure is sent to 3a. As a result, even if the centrifugal force acting on the vane 114 is small, the vane 114 easily jumps out of the vane groove.

[0006]

However, when the electromagnetic clutch is turned on, the rotating shaft and the rotor move to the rear side block side, so that the rear side end surface of the rotor 102 is pressed against the rotor side end surface of the rear side block 104. There was a problem of causing wear and seizure.

The present invention has been made in view of the above circumstances, and its object is a vane capable of preventing abrasion and seizure between the rear end surface of the rotor and the rotor end surface of the rear side member when the compressor is started. To provide a mold compressor.

[0008]

According to another aspect of the present invention, there is provided a vane compressor which is fixed to a drive shaft and is rotatably housed in a cam ring, and the drive shaft. An electromagnetic clutch attached to one end side, a vane slidably inserted in a plurality of vane grooves provided in the rotor, a front side member fixed to a front end surface of the cam ring, and a rear side of the cam ring. A rear side member fixed to the side end surface, a vane back pressure chamber provided in the bottom of the vane groove, a high pressure chamber provided in the front side member and located on the front side of the front side member, and the vane back. When the pressure in the high-pressure chamber does not reach a predetermined value and the high-pressure inlet that communicates with the pressure chamber, the high-pressure inlet is opened, and the pressure in the high-pressure chamber reaches a predetermined value. In a vane compressor provided with an on-off valve for closing the high-pressure introducing passage, a high pressure supplied from the high-pressure introducing passage through the vane back pressure chamber to the rotor-side end surface of the rear side member is provided on the rear side of the rotor. A groove is provided between the end surface and the rotor-side end surface of the rear side member.

Further, in the vane compressor according to the second aspect of the present invention, the rear side member is attached to the rear head fixed to the rear end surface of the cam ring and the rear head in a state of facing the rear end surface of the rotor. A movable plate held and movable along the center line of the drive shaft;
And a biasing member that biases the movable plate toward the rotor.

[0010]

In the vane type compressor according to the first aspect of the present invention, when the electromagnetic clutch is turned on (when the compressor is started), the drive shaft moves to the rear side, and the rear end surface of the rotor serves as the rear side member. Although it is pressed against the rotor-side end surface, the on-off valve opens because the pressure in the high-pressure chamber does not reach the specified value, and high-pressure fluid is sent from the high-pressure chamber to the vane back-pressure chamber and the groove on the rotor-side end surface of the rear side member through the high-pressure introduction passage. And is supplied from the groove between the rear side end surface of the rotor and the rotor side end surface of the rear side member.Therefore, the high pressure fluid from the groove causes the rear side end surface of the rotor and the rotor side end surface of the rear side member at the time of starting the compressor. The sliding surface pressure is reduced and wear can be suppressed.

Further, in the vane type compressor according to the present invention, the rear side member is held by the rear head in a state of facing the rear head fixed to the rear end surface of the cam ring and the rear end surface of the rotor. Since the movable plate is movable along the center line of the drive shaft and the urging member that urges the movable plate toward the rotor, the high pressure fluid sent into the groove and the urging force are applied. The biasing force of the member cancels the force to the rear side of the rotor at the time of starting the compressor, and the sliding surface pressure between the rear side end surface of the rotor and the rotor side end surface of the rear side member can be easily reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view showing a vane type compressor according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II--II of FIG. 1, and FIG. is there.

This vane type compressor includes a cam ring 1 and
A front side block 3 and a rear side member 2 that are fixed so as to close both open ends of the cam ring 1.
0 and a rotor 2 rotatably housed in the cam ring 1.
A front case 5 that is connected to the rotor-side end of the rear head 6 and that includes the front side block 3 and the cam ring 1; The drive shaft 7 is rotatably supported by bearings 8 and 9. An electromagnetic clutch (not shown) is attached to one end of the drive shaft 7.

The rear side member 20 is a cam ring 1
The rear head 6 is fixed to the rear end face of the rotor 2, and the movable plate 4 has a substantially disk shape and faces the rear end face of the rotor 2. The rear head 6 has a refrigerant gas suction port 6
a is formed, and the suction port 6 a communicates with a suction chamber 11 formed in the rear head 6.

The movable plate 4 is housed in a recess 6b provided on the rotor-side end surface of the rear head 6 so as to be movable along the center line of the drive shaft 7. Movable plate 4
And O-rings 21 and 2 between the rear head 6 and the recess 6b of the rear head 6.
2 is interposed, and the elasticity of the O-rings (biasing members) 21 and 22 biases the movable plate 4 toward the rear end surface of the rotor 2. As shown in FIG. 3, the movable plate 4 is provided with two upper and lower suction ports 12a, 12a corresponding to two upper and lower compression spaces 12 (see FIG. 2) described later. The suction chamber 11 and the compression space 12 communicate with each other via the suction ports 12a, 12a. An annular groove (groove) 23 is provided on the rotor-side end surface of the movable plate 4. The annular groove 23 is offset by 180 degrees so as to communicate with the vane back pressure chamber 13a of the vane groove 13 of each vane 14 in the section from the start position of the suction stroke to the end position of the compression process. The communication between the large-diameter groove portions 23a, 23a, which are provided for the purpose, and the vane back pressure chamber 13a of the vane groove 13 of each vane 14 in the section from the end position of the compression process to the end position of the discharge stroke is disconnected. It is composed of small-diameter groove portions and 23b, 23b that are symmetrically provided so as to be tilted by 180 degrees.

A discharge port (not shown) for the refrigerant gas is formed in the front case 5, and the discharge port communicates with a discharge chamber (high pressure chamber) 10 formed by the front case 5 and the front side block 3.

The front side block 3 is shown in FIG.
As shown in FIG. 5, a high pressure introducing passage 24 is provided to directly connect the discharge chamber 10 and the vane back pressure chamber 13a. An open / close valve 25 is provided in the high pressure introducing passage 24 to open the high pressure introducing passage 24 when the pressure in the discharge chamber 10 does not reach a predetermined value and close the high pressure introducing passage 24 when the pressure in the discharge chamber 10 reaches a predetermined value. It is provided. The on-off valve 25 includes a ball valve element 25a that is displaced between an open position and a valve closed position, a coil spring 25b that biases the ball valve element 25a in the valve opening direction, and a ball valve element 25a.
With a locking pin 25c that locks at the valve opening position.

Two upper and lower compression spaces 12 are defined between the inner peripheral surface of the cam ring 1 and the outer peripheral surface of the rotor 2, as shown in FIG. 2 (one compression space in FIG. 1). Space 1
Only 2 is visible). Rotor 2 has multiple vane grooves 1
3 are provided, and vanes 14 are provided in these vane grooves 13.
Is slidably inserted. A vane back pressure chamber 13a is formed in the inner portion of each vane groove 13. The compression space 12 is partitioned by a vane 14 to form a compression chamber, and the volume of the compression chamber changes with the rotation of the rotor 2.

Further, two discharge ports 16 corresponding to the two compression spaces 12 are provided on the outer peripheral wall of the cam ring 1 (only one discharge port 16 is visible in FIG. 2). Further, a flat type discharge valve 19 for opening and closing the discharge port 16 is fixed to the outer peripheral wall of the cam ring 1 by a bolt 18 together with a valve retainer 19a. When the discharge port 16 is opened, the compressed refrigerant gas in the compression space 12 is discharged through the discharge port 16, the passages 5a and 3a, the discharge chamber 10 and the discharge port.

Next, the operation of this vane type compressor will be described.

When the rotational power of the engine (not shown) is transmitted to the drive shaft 7 via the electromagnetic clutch, the rotor 2 rotates.
The refrigerant gas flowing out from the outlet from the evaporator (not shown) enters the suction chamber 11 through the suction port 6a, and the suction chamber 11
Is sucked into the compression space 12 through the suction port 12a. The compression space 12 is partitioned by the vanes 14, and the volume of each compression chamber changes with the rotation of the rotor 2. Therefore, the refrigerant gas trapped between the vanes 14 is compressed, and the compressed refrigerant gas is discharged. The valve 19 is opened, the gas flows from the discharge port 16 into the discharge chamber 10, and is further discharged from the discharge port 5a.

At the time of starting the compressor (when the electromagnetic clutch is turned on), until the pressure in the discharge chamber 10 reaches a predetermined value,
The ball valve element 25a of the opening / closing valve 25 is in the valve opening position by the urging force of the coil spring 25b, and the opening / closing valve 25 opens the high pressure introduction passage 24. Therefore, the high pressure refrigerant gas in the discharge chamber 10 is sent to the vane back pressure chamber 13 a through the high pressure introduction passage 24. As a result, the vane 14 easily pops out of the vane groove 13 even if the centrifugal force acting on the vane 14 is small.

The high-pressure refrigerant gas sent into the vane back pressure chamber 13a through the high-pressure introducing passage 24 is introduced into the annular groove 23 of the movable plate 4, and the rotor 2 is driven by the high-pressure refrigerant gas introduced into the annular groove 23. Is pushed to the front side. Further, high-pressure refrigerant gas is supplied from the annular groove 23 between the rear end surface of the rotor 2 and the rotor side end surface of the movable plate 4. Therefore, when the compressor is started, the drive shaft 7 moves to the rear side, and the rear end surface of the rotor 2 is pressed against the rotor end surface of the movable plate 4, but the high pressure refrigerant gas sent from the annular groove 23 and The biasing force of the O-ring 22 cancels the rearward force of the rotor 2 and reduces the sliding surface pressure between the rear end surface of the rotor 2 and the rotor side end surface of the movable plate 4. Thereby, abrasion can be suppressed and seizure can be prevented.

When the pressure in the discharge chamber 10 reaches a predetermined value after the start of the compressor to enter a steady operation state, the ball valve element 25a of the opening / closing valve 25 moves to the valve closing position against the biasing force of the coil spring 25b. Then, the high pressure introduction passage 24 is closed, and the supply of the high pressure refrigerant gas from the high pressure introduction passage 24 to the vane back pressure chamber 13a and the annular groove 23 is stopped.

[0026]

As described above, according to the vane type compressor of the invention described in claim 1, when the electromagnetic clutch is turned on (when the compressor is started), the drive shaft moves to the rear side,
The rear side end surface of the rotor is pressed against the rotor side end surface of the rear side member, but since the pressure in the high pressure chamber does not reach a predetermined value, the opening / closing valve opens, and the high pressure chamber leads from the high pressure chamber to the vane back pressure chamber and the rear side member rotor side. High-pressure fluid is sent into the groove on the end face, and the rear-side end face of the rotor is pushed back to the front side by the high-pressure fluid in the groove, so that the rear-side end face of the rotor and the rotor-side end face of the rear-side member when the compressor starts up. Sliding surface pressure is reduced, wear can be suppressed,
It is possible to prevent seizure. Wear and seizure can be prevented.

According to the vane type compressor of the second aspect of the present invention, the high pressure fluid sent into the groove and the urging force of the urging member apply a force to the rear side of the rotor when the compressor is started. The sliding surface pressure between the rear side end surface of the rotor and the rotor side end surface of the rear side member can be easily reduced, and the rear side end surface of the rotor and the rotor side end surface of the rear side member at the time of starting the compressor can be easily canceled. Wear can be further suppressed and seizure can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a vane compressor according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a view on arrow A in FIG.

FIG. 4 is a vertical cross-sectional view of a conventional vane compressor.

[Explanation of symbols]

 1 cam ring 2 rotor 4 movable plate 6 rear head 7 drive shaft 10 discharge chamber 13 vane groove 13a vane back pressure chamber 14 vane 16 discharge port 20 rear side member 23 annular groove 24 high pressure introduction path

Claims (2)

[Claims] 1. A rotor fixed to a drive shaft and rotatably housed in a cam ring, an electromagnetic clutch attached to one end side of the drive shaft, and a plurality of vane grooves provided in the rotor. A vane that can be inserted, a front side member that is fixed to the front end face of the cam ring, a rear side member that is fixed to the rear end face of the cam ring, and a vane back pressure chamber provided at the bottom of the vane groove. And a high pressure introducing passage provided in the front side member and connecting the high pressure chamber located on the front side of the front side member with the vane back pressure chamber, and when the pressure in the high pressure chamber does not reach a predetermined value. A vane compressor having an opening / closing valve that opens the high-pressure introducing passage and closes the high-pressure introducing passage when the pressure in the high-pressure chamber reaches a predetermined value. The rotor-side end surface of the id member is provided with a groove for sending the high pressure supplied from the high-pressure introduction path through the vane back pressure chamber between the rear-side end surface of the rotor and the rotor-side end surface of the rear-side member. A vane type compressor characterized in that 2. The rear side member is held by the rear head in a state of facing the rear head fixed to the rear end surface of the cam ring and the rear end surface of the rotor, and along the center line of the drive shaft. 2. A movable plate that is movable and a biasing member that biases the movable plate toward the rotor side.
The vane compressor described.