JPH09250471A - Vane type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a movable plate from being deformed without increasing the weight of a compressor and prevent the performance from being lowered, noises from being generated, and seizure. SOLUTION: A movable plate 4 movable along the center line of a driving shaft, 7 is held on a rear head 6 in s state opposite to the rear side end face of a cam ring 1, and a compression chamber and a delivery chamber 10 formed between vanes are shielded by means of the movable plate 4, and a space is provided where atmospheric air is sealed inside the movable plate 4. Since the pressure of this space is lower than the pressure on both sides of the movable plate (pressure between the compression chamber and the delivery chamber 10), the movable plate 4 is deformed, however, the section of the movable plate 4 is deformed in almost weight shape. At this time the outer circumference edge part of the movable plate 4 comes into contact with the rear side end face of the cam ring 1, and only the center part of the movable plate does not enter a middle-height state extruded to the cam ring 1 side.

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 provided with a movable plate for partitioning a compression chamber and a discharge chamber.

[0002]

2. Description of the Related Art FIG. 5 is a vertical sectional view of a vane type compressor.

This vane type compressor has a cam ring 101.
A front head 105 fixed to the front end surface of the cam ring 101, a rear head 106 fixed to the rear end surface of the cam ring 101, a rotor 102 rotatably housed in the cam ring 101, and a rotor 102. A plurality of vane grooves (not shown), a plurality of vanes (not shown) slidably inserted in the vane grooves, and a drive shaft 107 of the rotor 102 are provided. Drive shaft 10
7 is rotatably supported by bearings 108 and 109.

A movable plate 104, which is movable along the center line of the drive shaft 107, is held by the rear head 106 so as to face the rear end surface of the cam ring 101. Movable plate 104 and boss 1 of rear head 106
An O-ring 121 is interposed between the front end surface of 06d and the movable plate 1 by the urging force of the O-ring 121.
04 is biased to the rear end surface of the cam ring 101.

Further, the movable plate 104 partitions the compression chamber (inside the cam ring 101) formed between the vanes and the discharge chamber 110.

When the rotor 102 rotates when the refrigerant in the compression chamber is in a liquid state at the time of starting the compressor, so-called liquid compression occurs. The compression pressure at this time temporarily pushes the movable plate 104 toward the rear side. Since the movable plate 104 moves to the rear side against the urging force of the O-ring 121, a gap is created between the front end face of the movable plate 104 and the rear end face of the rotor 102, and the liquid refrigerant is discharged through the gap. To be done. As a result, liquid compression is avoided, and it is possible to prevent galling and damage of the rotor 102, and protect the internal mechanism.

[0007]

FIG. 6 is a partially enlarged view showing a deformed state of the movable plate of the vane type compressor shown in FIG. 5, and FIG. 6 is a conceptual diagram for explaining the relationship between the cam ring and the movable plate. .

As described above, the inside of the cam ring 101 and the discharge chamber 110 are partitioned by the movable plate 104, and the pressure inside the discharge chamber 110 is higher than the pressure inside the cam ring 101 (especially during steady operation after the start of the compressor). ).

Therefore, the movable plate 104 is pressed against the rear end surface of the cam ring 101 due to the pressure difference, but since there is a minute gap between the movable plate 104 and the rear end surface of the cam ring 101, the movable plate 1
Almost the same high pressure is applied to both end faces of 04 to balance pressure, and the pressing force in the cam ring direction applied to the outer peripheral edge of the movable plate 104 is canceled.

As a result, the state shown in FIG.
The movable plate 104 is deformed to the state shown in (b) (so-called middle-height state, in which the central portion of the movable plate 104 projects toward the cam ring as shown in FIG. 6), and the refrigerant in the compression chamber leaks, degrading performance. The movable plate 10
4 causes fluttering to generate noise and seizure due to adhesion.

As a method of solving this problem, a low-pressure chamber (not shown) is provided on the front end surface of the boss portion 106d of the rear head 106, and a low pressure is applied to the central portion of the rear end surface of the movable plate 104, so that the movable plate 104 can be applied. It is also possible to consider a method of preventing the deformation of the.

However, with this method, the boss portion 106d of the rear head 106 must be made large, which causes a problem of increasing the weight of the compressor. Therefore, it is not the best to use this method.

The present invention has been made in view of the above circumstances, and its object is to prevent deformation of the movable plate without increasing the weight of the compressor, and prevent performance deterioration, noise generation, and seizure. A vane compressor capable of

[0014]

In order to solve the above problems, a vane type compressor according to a first aspect of the present invention is provided with a rotor fixed to a drive shaft and rotatably housed in a cam ring. A vane slidably inserted in a plurality of provided vane grooves, a front side member arranged on the front side of the cam ring, a rear side member arranged on the rear side of the cam ring, and the front side. In a vane compressor provided with a member and a high pressure chamber formed in one of the rear side members, at least one of the front side member and the rear side member,
A movable plate facing one end surface of the cam ring is movably held in the axial direction, and the movable plate partitions the compression chamber and the high-pressure chamber formed between the vanes by the movable plate. There is a closed low-pressure space inside the movable plate.

After the compressor is started, when it is in a steady operation state,
The pressure in the discharge chamber rises and the movable plate is pressed against the end surface of the cam ring on the movable plate side. The high pressure is applied to balance the pressure, and the pressing force in the cam ring direction applied to the outer peripheral edge of the movable plate is canceled. However, since there is a low-pressure space inside the movable plate, and the pressure in this low-pressure space is lower than the pressure on both sides of the movable plate (the pressure inside the cam ring and the high-pressure chamber), the cross-section of the movable plate transforms into a weight. (Deformation such that both end surfaces of the movable plate approach in the low-pressure space). That is, the outer peripheral edge portion of the movable plate is in contact with the end surface of the cam ring on the movable plate side, and only the central portion of the movable plate is not in a middle-height state protruding in the cam ring direction.

Further, the lubricating oil that has entered between the cam ring side end surface of the movable plate and the movable plate side end surface of the rotor is less likely to escape.

A vane type compressor according to a second aspect of the invention is
In the vane compressor according to the first aspect of the present invention, the low pressure space is filled with air.

Since the pressure in the low-pressure space is atmospheric and the pressure in the low-pressure space is lower than the pressure on both sides of the movable plate (the pressure inside the cam ring and the high-pressure chamber), the cross-section of the movable plate is deformed into a weight. The outer peripheral portion of the movable plate is in contact with the end surface of the cam ring on the movable plate side, and only the central portion of the movable plate does not have a middle-height state protruding in the cam ring direction.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments 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 line II-II of FIG. 1, and FIG. 3 is a view showing a movable plate. 3 (a)
Is a plan view of the movable plate, and FIG. 3 (b) is A in FIG. 3 (a).
It is sectional drawing which follows the -A line.

This vane type compressor includes a cam ring 1 and
The front side member 25 and the rear side member 20 respectively disposed on both end surfaces of the cam ring 1, and the cam ring 1
A rotor 2 rotatably housed therein and a drive shaft 7 of the rotor 2 are provided. 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 front side member 25 is composed of only the front head 5 fixed to the front end surface of the cam ring 1.

The front head 5 has a refrigerant gas suction port 5
a is formed, and the suction port 5 a communicates with a suction chamber 11 formed in the front head 5.

The rear side member 20 is the cam ring 1
It is composed only of the rear head 6 fixed to the rear end face of the.

A recess 6 is formed on the front end surface of the rear head 6.
b is provided, and the movable plate 4 is housed in the recess 6b in a state of facing the rear end surface of the cam ring 1.

The movable plate 4 is an annular disc (see FIG. 3).
(See (a)), and an annular space (low-pressure space) 4a in which the atmosphere is enclosed is formed therein (see FIG. 3 (b)). As a method of manufacturing the movable plate 4, for example, there is a method of welding (or brazing) two annular plates in the atmosphere (in the furnace). At this time, different materials may be used, and the annular plate made of one material may be hardened and the annular plate made of the other material may not be hardened.

The rear end of the drive shaft 7 is loosely inserted in the center hole of the movable plate 4, and the movable plate 4 is movable along the center line of the drive shaft 7. An O-ring 21 is interposed between the movable plate 4 and the recess 6b of the rear head 6, and the movable plate 4 is biased to the rear end surface of the cam ring 1 by the biasing force of the O-ring 21.

A discharge chamber 10 is formed in the rear head 6, and the discharge chamber 10 and a compression chamber described later are separated by a movable plate 4. The rear head 6 is formed with a discharge port 6a for the refrigerant gas, and the discharge port 6a communicates with the discharge chamber 10.

Two compression spaces 12 are formed between the inner peripheral surface of the cam ring 1 and the outer peripheral surface of the rotor 2 as shown by the broken line in FIG. 2 (one of the compression spaces 12 in FIG. 1). Only compression space 12 is visible). The rotor 2 is provided with a plurality of vane grooves 13, and vanes 14 are slidably inserted in the vane grooves 13. The compression space 12 is partitioned by vanes 14 to form a plurality of compression chambers,
The volume of each compression chamber changes with the rotation of the rotor 2.

Further, the cam ring 1 is provided with a discharge space 1c for discharging the high-pressure refrigerant gas in the compression chamber, and the discharge space 1c communicates with the discharge chamber 10. Only one discharge space 1c is visible in FIG. A discharge valve (not shown) that opens and closes a discharge port 16 described later is housed in the discharge space 1c.

The partition wall 1a for partitioning the discharge space 1c and the compression space 12 is provided with discharge ports 16 corresponding to the two compression spaces 12 (one discharge port 16 in FIG. 1).
Only visible).

The front end surface of the cam ring 1 is provided with a suction port 12a for sending low-pressure refrigerant gas from the suction chamber 11 to the compression chamber in the suction stroke.

Next, the operation of the 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.
Refrigerant gas from an evaporator (not shown) enters the suction chamber 11 through the suction port 5a, and the suction port 1 passes through the suction chamber 11.
It is sucked into the compression space 12 through 2a. Compression space 12
The inside is divided into a plurality of compression chambers 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 compressed. Opens the discharge valve, and from the discharge port 16 through the discharge space 1c and the discharge passage 6c to the discharge chamber 1
0, and is further discharged from the discharge port 6a.

When the rotor 2 is rotated when the refrigerant in the compression space 12 is in a liquid state at the time of starting the compressor, so-called liquid compression occurs. The compression pressure at this time causes the movable plate 4 to temporarily move to the rear side. The movable plate 4 is pushed and moves to the rear side against the urging force of the O-ring 21, thereby forming a gap between the front end face of the movable plate 4 and the rear end face of the rotor 2, and through the gap. Since liquid refrigerant is discharged, liquid compression is avoided.

When the compressor is started (when the electromagnetic clutch is turned on), the drive shaft 7 moves to the rear side and the rotor 2
The rear end surface of the rotor 2 is pressed against the front end surface of the movable plate 4, but since the movable plate 4 moves to the rear side against the urging force of the O-ring 21, the rear end surface of the rotor 2 and the front surface of the movable plate 4 are moved. The sliding surface pressure with the side end face is reduced, and wear is suppressed.

Further, the pressure of the discharge chamber 10 at the time of starting the compressor is lower than that at the time of operation, the gap between the movable plate 4 and the rotor 2 is relatively large, and the high pressure refrigerant is deep inside the vane groove 13 in a short time at the time of starting. Since it is supplied to the section, the vane 14 easily pops out.

After the compressor is started, when it is in a steady operation state,
The pressure of the discharge chamber 10 rises, and the movable plate 4 is pressed against the rear end surface of the cam ring 1.
Through a small gap between the front end face of the cam ring 1 and the rear end face of the cam ring 1, almost the same high pressure is applied to both end faces of the movable plate 4 to balance the pressure and push the outer periphery of the movable plate 4 in the cam ring direction. The pressure is counteracted.
However, since there is a space 4a in which the atmosphere is sealed inside the movable plate 4 and the pressure in this space 4a is significantly lower than the pressure on both sides of the movable plate 4 (the pressure in the compression chamber and the discharge chamber 10), As shown in FIG. 4, the cross section of the movable plate 4 is deformed into a substantially weight shape (deformation such that both end surfaces of the movable plate 4 approach within the space 4a). At this time, the outer peripheral edge portion of the movable plate 4 is in contact with the rear side end surface of the cam ring 1, and only the central portion of the movable plate 4 is not in a middle-height state protruding toward the cam ring 1.

Therefore, according to the vane type compressor of this embodiment, the refrigerant in the compression chamber leaks to deteriorate the performance, the movable plate 4 flaps to generate noise, and seizure due to adhesion occurs. I do not.

Further, the lubricating oil that has entered between the front end surface of the movable plate 4 and the rear end surface of the rotor 2 is less likely to escape, and the sliding characteristics between the rotor 2 and the movable plate 4 are further improved.

Further, in the vane type compressor of this embodiment, a low pressure chamber (not shown) is provided on the front end surface of the boss portion of the rear head 6, and a low pressure is applied to the rear end surface of the movable plate 4 so that the movable plate can be moved. Since it is not a structure for preventing the deformation of No. 4, it is not necessary to make the boss portion of the rear head 6 large, and it is possible to prevent the weight of the compressor from increasing.

In the above embodiment, the movable plate 4 is arranged only on the rear side. However, as another embodiment, the movable plate 4 is arranged on both the rear side and the front side. Alternatively, it may be arranged only on the front side.

In the above embodiment, the case where the atmosphere is enclosed in the space 4a of the movable plate 4 has been described.
The space 4a of the movable plate 4 may be evacuated.

[0044]

As described above, according to the vane type compressor of the first aspect of the invention, after the compressor is started, the pressure in the low pressure space of the movable plate is the pressure on both sides of the movable plate (inside the cam ring). Since the pressure of the movable plate is lower than that of the high pressure chamber, the cross section of the movable plate is deformed into a weight, the outer peripheral edge of the movable plate contacts the end face of the cam ring on the movable plate side, and only the center of the movable plate is on the cam ring side. Since it does not become a middle-high state that sticks out, the refrigerant in the compression chamber does not leak and its performance deteriorates, the movable plate flaps, noise is generated, and seizure due to adhesion does not occur.

Further, since the lubricating oil that has entered between the cam ring side end surface of the movable plate and the movable plate side end surface of the rotor is less likely to escape, the sliding characteristics between the rotor and the movable plate are improved.

Furthermore, since a low pressure chamber is provided on the front end surface of the boss portion of the rear head and a low pressure is applied to the rear end surface of the movable plate to prevent deformation of the movable plate, the boss of the rear head is not adopted. It is not necessary to increase the size of the section, and it is possible to prevent the weight of the compressor from increasing.

According to the vane type compressor of the second aspect of the present invention, it is possible to obtain the same effect as that of the first aspect of the present invention, and the atmosphere is enclosed in the low pressure space. It is easier to manufacture than when forming a low pressure space.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing 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 diagram for explaining a movable plate of the vane type compressor of FIG. 1.

4 is a partially enlarged view showing a deformed state of a movable plate of the vane compressor shown in FIG.

FIG. 5 is a vertical cross-sectional view showing a conventional vane compressor.

6 is a partially enlarged view showing a deformed state of a movable plate of the vane type compressor shown in FIG.

FIG. 7 is a conceptual diagram for explaining a relationship between a cam ring and a movable plate.

[Explanation of symbols]

 1 cam ring 2 rotor 4 movable plate 4a space 5 front head 6 rear head 7 drive shaft 10 discharge chamber 13 vane groove 14 vane 20 rear side member 25 front side member

Claims (2)

[Claims] 1. A rotor fixed to a drive shaft and rotatably housed in a cam ring, a vane slidably inserted in a plurality of vane grooves provided in the rotor, and a front side of the cam ring. A vane compressor including a front side member arranged, a rear side member arranged on a rear side of the cam ring, and a high pressure chamber formed in one of the front side member and the rear side member, A movable plate facing one end surface of the cam ring is axially movably held by at least one of the front side member and the rear side member, and the movable plate and the compression chamber formed between the vanes are formed by the movable plate. The high pressure chamber is partitioned by the movable plate, and there is a closed low pressure space inside the movable plate. A vane type compressor to collect. 2. The vane compressor according to claim 1, wherein the low pressure space is filled with air.