JPS63131890A - Vane type rotary compressor of variable delivery - Google Patents

Abstract

PURPOSE:To make machining easier by constituting a front plate of a cam ring with a plate member to be slide-contacted with a side surface of a movable plate and a ring member for accommodating on its inner circumference the movable plate. CONSTITUTION:A front plate 2 is attached to an opening end of the front side of a cam ring 1 while a rear plate 3 is attached to the rear side. The front plate 2 is constituted with a plate member 2a and a plate-like ring member 2b interposed between the plate member 2a and a rotor 4. As a result, maching of the front plate is made easier to reduce production cost.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a variable capacity vane type rotary compressor used as a refrigerant compressor for an automobile air conditioner, for example.

(Prior art) In general, in vane type rotary compressors, in order to variably control the discharge amount, for example, a suction port that opens into the cam ring is provided in a side block that seals one end of the cam ring, and the opening position is adjusted to the cam surface. The compression start position of the vane is changed by moving the vane along the .

Conventional variable capacity vane type rotary compressors of this type include:
For example, JP-A No. 61-49189 or Utility Model Application No. 5
The one described in Japanese Patent No. 9-76786 is known. In both types, an arc-shaped suction port that opens to almost the entire working chamber is formed on the front plate provided on the front side of the cam ring, and the space between the front plate and the cam ring rotates around the rotor axis. A freely movable disc is provided. Further, the movable disc is provided with a bypass passage that communicates the suction port of the front plate with the working chamber, and the movable disc is rotated to change the vane compression start position.

(Problems to be Solved by the Invention) However, in such a conventional variable capacity vane type rotary compressor, a circular recess is formed on the cam ring side of the front plate, and a movable disc is housed in the recess. Because of this structure, when forming the recessed portion of the front plate by, for example, machining, it is difficult to manage the dimensional accuracy, resulting in an increase in manufacturing costs. For example, if the dimensional accuracy is poor and the step dimension of the recess is larger than the thickness of the movable disc,
・The gap between the disc and the rotor becomes larger, and the compressed refrigerant gas leaks to the suction side through this gap, deteriorating the performance of the compressor. On the other hand, the step dimension of the recess is smaller than the thickness of the movable disc. Then, the movable disk comes into contact with the rotor, and since high-pressure lubricating oil is introduced into the rear wheel of the rotor, the movable disk is pressed against the rotor by this pressure, making it difficult to rotate. For this reason, in the former conventional example described above (described in Japanese Patent Application Laid-open No. 61-49189), high-pressure oil from the compressor is guided between the front plate and the movable disc, and the movable disc is pressed against the cam ring. This reduces refrigerant gas leaks and prevents deterioration of compressor performance.

However, even in this case, an oil passage or a seal member is provided inside the compressor to guide high-pressure oil.
On the contrary, there was a problem in that manufacturing costs increased.

(Purpose of the Invention) Therefore, the present invention makes it easy to process the front plate and compress The aim is to reduce the manufacturing cost of the compressor and improve the performance of the compressor.

(Means for Solving the Problems) In order to achieve the above object, the variable capacity vane type rotary compressor according to the present invention includes a cam ring with a cam surface formed on the inner periphery and a plurality of suction ports. A front plate provided on the front side, a rear plate that seals the opening on the rear side of the cam ring, a rotor located between the front plate and the rear plate and rotatably housed in the cam ring, and the cam ring and A plurality of working chambers formed by the rotor, a plurality of vanes that are retractably fitted into the rotor and come into sliding contact with the cam surface at their tips, and a bottom that houses the cam ring, front plate, rear plate, rotor, and vanes. A cylindrical housing, a head cover that seals an open end of the housing, a suction chamber defined by the head cover and a front plate, and a suction chamber formed in the cam ring and communicating with the suction chamber through an inlet of the front plate. , a plurality of suction ports that open on the cam surface so that communication with the working chamber is cut off when the volume of the working chamber divided by the vane reaches its maximum; A bypass port that opens into the working chamber along the side and communicates with the suction chamber, and a movable plate that is rotatably provided between the front plate and the cam ring and has a bypass opening that adjusts the opening degree of the bypass port. , in a variable capacity vane rotary compressor that changes the discharge amount of the compressor by rotating the movable plate, the front plate includes a plate member with which a front side surface of the movable plate slides; It consists of a ring member provided between the cam rings and housing a movable plate on the inner periphery.

(Function) In the present invention, the front plate is constituted by a plate member on which the side surface of the movable plate slides, and a ring member that accommodates the movable plate in its inner periphery. In addition, since the front plate is easier to process, the manufacturing cost of the compressor is reduced.
At the same time, the performance of the compressor is improved.

(Example) Hereinafter, the present invention will be explained based on the drawings.

1 to 3 are diagrams showing one embodiment of the present invention.

In FIG. 1.2, 1 is a cylindrical cam ring, and a cam surface 1a having a substantially elliptical cross section is formed on the inner periphery. A front plate 2 is attached to the opening end on the front side (left side in Figure 1) of the cam ring 1, and a rear plate 3 seals the opening of the cam ring 1 at the entrance end on the rear side (right side in Figure 1). It is installed as follows. A rotor 4 is rotatably housed between the front plate 2 and the rear plate 3, and the rotor 4 has a plurality of bees 75 at the tip end of which are connected to the cam surface 1.
It is inserted so that it can come out and go out freely so that it comes into sliding contact with a. The cam ring 1, front plate 2, rear plate 3, rotor 4, and vane 5 are housed in a bottomed cylindrical housing 6, and the front opening end of the housing 6 (left end in FIG. 1) has an opening. A head cover 7 for sealing is attached with bolts not shown. A pair of working chambers 10 are formed between the cam ring 1 and the rotor 4, and are in communication with a pair of suction ports 11 opened on the cam surface 1a.

These suction ports 11 are provided so that communication with the working chamber 10 is cut off when the volume of the working chamber 10 divided by the vanes 5 reaches its maximum. It consists of a hole 11a and a hole 11b that communicates with a suction chamber 14, which will be described later, through a suction port 16 (see FIG. 2) formed in the front plate 2. A pair of discharge ports 12 formed in the cam ring 1 are opened at the end of the working chamber 10 (the end in the clockwise rotation direction in FIG. 2), and the housing 6 is opened through a discharge valve provided in the discharge ports 12. The discharge chamber 13 and the working chamber 10 inside are in communication.

Reference numeral 14 denotes a suction chamber defined by the front plate 2 and the head cover 7, into which refrigerant gas is introduced from an inlet 15 provided in the head cover 7, and is introduced through an inlet 16 and a suction port 11 formed in the cam ring 1. (
(See FIG. 2) Refrigerant gas is supplied to each of the working chambers 10.

As shown in FIG. 3, the front plate 2 includes a circular plate member 2a and a plate-shaped ring member 2b interposed between the plate member 2a and the rotor 4. As shown in FIG. A pair of arc-shaped bypass ports 17 are formed in the plate member 2a to communicate the working chamber 10 and the suction chamber 14, and the bypass port 17 connects the suction port along the cam surface 1a as shown in FIG. 11 opens along the working chamber 10 from near the opening end 11C opening into the working chamber 10 to near the opening position of the discharge port 12. A disc-shaped movable plate 18 is interposed between the plate member 2a of the front plate 2, the cam ring l, and the rotor 4 so as to cover the end of the working chamber 10. It is in sliding contact with the plate member 2a via the thrust bearing 50, and is housed in the inner periphery 2C of the ring member 2b of the front plate 2, and is supported rotatably around the axis of the rotor 4. As shown in FIG. 3, a pair of bypass openings 19 are formed in the movable plate 18 by fan-shaped notches along the outer periphery, and the movable plate 18 allows the working chamber 10 to be
The opening degree of the bypass port 17 communicating with the suction chamber 14 is adjusted. That is, in FIG. 2, when the movable plate 18 is rotated clockwise and the opening degree of the bypass port 17 increases, the amount of bypass from the working chamber IO to the suction chamber 14 increases, and the discharge amount of the compressor decreases. Conversely, when the movable plate 18 is rotated counterclockwise and the opening degree of the bypass port 17 becomes smaller, the discharge amount of the compressor increases. In addition,
23 is provided on the head cover 7 and is connected to the ring plate 2
This is an actuator cylinder that rotates the movable plate 18 via the cylinder 0.

Next, the effect will be explained.

In FIG. 1, when the rotating shaft of the rotor 4 is connected to and driven by a vehicle engine, etc., and the rotor 4 rotates in the clockwise direction in FIG. The tip protrudes from the cam ring 1.
The refrigerant gas is sucked into the compressor through the inlet port 15, and the refrigerant gas is compressed to a high pressure and high temperature and is supplied to an air conditioner (not shown) through the discharge chamber 13. Ru. At this time, actuator cylinder 2
3, the movable plate 1 is moved through the ring plate 20.
8 is rotated to control the discharge amount of the compressor.

On the other hand, the front plate 2 is divided into a plate member 2a and a ring member 2b, and since the shapes of each are simplified, each side surface is finished with extremely high precision, for example, by grinding.

For this reason, the difference between the thickness of the ring member 2b and the thickness of the movable plate 18, that is, the dimensional accuracy of the gap between the movable plate 18 and the rotor 4, is ensured well, and leakage of compressed refrigerant gas is prevented during operation of the compressor. This eliminates the difficulty of turning. Therefore, performance deterioration of the compressor is prevented, and the movable plate 18
is rotated smoothly, and the discharge amount of the compressor is appropriately controlled in accordance with the load of the air conditioner.

As described above, according to this embodiment, the front plate 2 is constituted by the plate member 2a on which the side surface of the movable plate 18 slides, and the ring member 2b that accommodates the movable plate 18 on the inner periphery 2C. 2. Processing can be facilitated. As a result, the manufacturing cost of the compressor can be reduced and the performance of the compressor can be improved.

(Effects) According to the present invention, since the front plate is constituted by the plate member on which the side surface of the movable plate slides and the ring member that accommodates the movable plate on the inner periphery, processing of the front plate can be facilitated. can. Therefore, the manufacturing cost of the compressor can be reduced, and the performance of the compressor can be improved.

[Brief explanation of the drawing]

1 to 3 are diagrams showing an embodiment of a variable capacity vane type rotary compressor according to the present invention, and FIG. 1 is a front sectional view thereof;
FIG. 2 is a sectional view taken along line nn in FIG. 1, and FIG. 3 is a perspective view of the front plate and movable plate. ■...Cam ring, 1a...Cam surface, 2...Front plate, 2a...Plate member, 2b...Ring member, 2C ...Inner circumference, 3...Rear plate, 4...Rotor, 5...Vane, 6...Housing, 7... ...Hend cover, 10...Working chamber, 11...Suction port, 14...Suction chamber, 16...Suction port, 17... ...Bypass port, 18...Movable plate, 19...Bypass opening.

Claims (1)

[Claims] A cam ring with a cam surface formed on its inner periphery, a front plate provided on the front side of the cam ring with multiple intake ports, a rear plate that seals the opening on the rear side of the cam ring, a front plate and A rotor located between the rear plates and rotatably housed in a cam ring, a plurality of working chambers formed by the cam ring and the rotor, and a rotor that is fitted into and retracted from the rotor and makes sliding contact with the cam surface at its tip. A bottomed cylindrical housing containing a plurality of vanes, the cam ring, the front plate, the rear plate, the rotor, and the vanes, a head cover that seals the open end of the housing, and an intake defined by the head cover and the front plate. The chamber is formed in the cam ring and communicates with the suction chamber through the suction port of the front plate, and when the volume of the working chamber divided by the vane reaches a maximum, communication with the working chamber is cut off. A bypass port is formed on the front plate that opens into the working chamber along the cam surface and communicates with the suction chamber, and a rotatable structure is provided between the front plate and the cam ring. a movable plate provided with a bypass opening for adjusting the opening degree of the bypass port;
A variable capacity vane type rotary compressor that changes the discharge amount of the compressor by rotating the movable plate, wherein the front plate includes a plate member with which a front side surface of the movable plate slides; A variable capacity vane type rotary compressor comprising a ring member provided between a plate member and a cam ring and housing a movable plate on the inner periphery.