JPS63100295A - Vane type compressor - Google Patents

Abstract

PURPOSE:To reduce the rotary resistance of a bypass control member, by applying a member for sealing the drive section of the bypass control member, i.e. a pressure operating chamber, onto the bypass control member and forming a sealing member to be arranged at an inner hole portion of the bypass control member into an arch. CONSTITUTION:A control member 24 having an arched notch 25 for communicating between a bypass port and a suction chamber is provided with a fitting section 24, in the central portion for bearing the control member 24 and pressure receiving boards 261, 262 for driving the control member 24 with a differential pressure. A pair of integrally formed resilient sealing members 61, 62 are deposited at the fitting section 24' of the control member 24 and the edge portion of the pressure receiving boards 261, 262. First seal portions 61a, 62a positioned at the fitting section 24, of the resilient sealing members 61, 62 are formed into arches, and the length of sealing line is shortened. Consequently, rotary resistance of the control member 24 is reduced and the control performance of the compressor is improved.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a vane compressor used as a refrigerant compressor in an automobile air conditioner, for example, and in particular to a vane compressor that can variably control the discharge capacity by controlling the compression start timing. This invention relates to a vane compressor.

(Prior Art and its Problems) Conventionally, as such a vane type compressor, for example, there is a technique disclosed in Japanese Patent Application No. 159310/1983 filed by the applicant of the present invention. The vane type compressor according to the application includes a cam ring whose both sides are closed with side blocks, a rotor rotatably disposed within the cam ring, and a vane slidably fitted into a vane groove of the rotor. In the vane compressor, the compressor compresses fluid by changing the volume of a cavity defined by the side block, the cam ring, the rotor, and the vane, the side having the suction port of the side blocks; a bypass port provided in the block; a pressure working chamber provided in the side block having the suction port and communicating with the low pressure chamber side and the high pressure chamber side; A pressure receiving plate is slidably fitted on one side so as to divide the pressure receiving plate into a first chamber communicating with the high pressure chamber and a second chamber communicating with the high pressure chamber, and the pressure receiving plate is fitted in the annular recess of the side block. an annular control member that is fitted so as to be rotatable in forward and reverse directions and controls the opening angle of the bypass port; a biasing member that urges the control member in a direction in which the opening angle of the bypass port increases; and the control member attached to
a seal member that seals between the first chamber and the second chamber and between the low pressure chamber side and the vane back pressure side; a communication path that communicates the second chamber and the low pressure chamber side; an on-off valve mechanism disposed in a passage that closes the communication passage when the pressure on the low pressure chamber side is above a predetermined value and opens the communication passage when the pressure on the low pressure chamber side is below a predetermined value. , the sealing member is
an annular first seal portion that is fitted into a fitting groove on the inner circumferential surface of the center hole of the control member to seal between the inner circumferential surface of the center hole and the inner surface of the annular recess of the side block; a second seal part concentric with the first seal part that is fitted into a fitting groove on the outer peripheral surface of the control member to seal between the outer peripheral surface of the control member and the inner surface of the annular recess of the side block; The second seal part is integrally provided so as to connect one end of the second seal part and the first seal part, and is fitted into a fitting groove on the outer peripheral side of the pressure receiving plate so that the outer peripheral side of the pressure receiving plate and the first seal part are connected to each other. a third seal portion that seals between the annular recess of the side block and the inner surface of the pressure working chamber; and a third seal portion that is integrally provided so as to connect the other end of the first seal portion and the second seal portion; and a fourth seal part that is fitted into a fitting groove on one side of the control member to seal between the one side of the control member and the inner surface of the annular recess of the side block; The control member rotates in accordance with the pressure difference between the bypass port and the second chamber to control the opening angle of the bypass port, thereby controlling the compression start timing and variable control of the discharge volume. be.

Specifically, in the vane compressor according to the above application, as shown in FIG. 10, a seal member 100 made of an elastic material such as rubber is attached to a control member 110. An annular first seal portion 10 that is fitted into a fitting groove 112 on the inner circumferential surface of the center hole 111 of 110
1 and fitting grooves 113 on both sides of the outer peripheral surface of the control member 110.
(Only one of the fitting grooves 113 is visible in the figure.) Arc-shaped second seal portions 102, 102 are fitted.

The pressure receiving plate 114 is formed into a U-shape by a vertical portion rising substantially vertically from one end of the second seal portions 102, 102 and the first seal portion 101, respectively, and a horizontal portion connecting the two vertical portions.
Between the third seal part 103.103 that is fitted into the U-shaped fitting grooves 115, 115 formed on the peripheral edge of the seal part 101, and the other ends of the first seal part 101 and the second seal part 102.102. and fourth seal portions 104, 104, which are integrally provided so as to connect and are fitted into linear fitting grooves 116, 116 provided on one side of the control member 110,
The first sealing member 100 communicates with the low pressure chamber side.
and a second chamber communicating with the high pressure chamber, and the inner and outer circumferential surfaces of the control member 24 and the inner and outer circumferential surfaces of the annular recess are hermetically sealed.

Further, in the vane type compressor according to the above application, in order to reduce the sliding resistance of the seal member 100 made of an elastic material such as rubber, the seal member 100 shown in FIG.
A sub-sealing member 120 made of resin such as Teflon (trademark name of DuPont) and having the same shape as shown in FIG. 11(B).
It has been proposed to construct a seal member 130 by overlapping the seal member 100 with the seal member 100 as shown in FIG. 11(C).

However, in the vane type compressor according to the above application, when only the seal member 100 is used as the seal member attached to the control member 110, the seal member 100
Since the first seal part 101 is formed in an annular shape, the sliding resistance between the first seal part 101 and the inner circumferential surface of the annular recess is large due to the long seal line length. There is a problem in that the rotational resistance of 110 becomes large, which may cause hysteresis and deteriorate controllability.

Further, in the vane type compressor according to the above application, the control member 1
The seal member 13 as a seal member attached to 10
0, first, each seal portion 101, 102, 103 and 104 of the seal member 100 is connected to the control member 110.
The first seal portion 121 of the sub-seal member 120 is fitted into the fitting grooves 112, 113, 115 and 116, respectively.
The outer circumferential surface of the first seal part 101 of the seal member 100 is fitted into the inner circumferential surface of the first seal part 101 of the seal member 100, and the second...
One side of each of the third and fourth seal parts 122, 123, and 124 is connected to the second side of the seal member 100. By overlapping the third and fourth seal parts 102, 103 and 104, the seal member 100 and the sub seal member 120 are connected to the control member 110.
The outer diameter of the first seal part 121 of the sub-seal member 120 is the same as that of the first seal part 1 of the seal member 100.
Since the dimensions are press-fitted to the inner diameter of 01, the first
The seal portion 121 is connected to the first seal portion 10 of the seal member 100.
1, there is no escape for the annular first seal part 121, and when fitting the first seal part 101 of the seal member 100 little by little while deforming the first seal part 121, the first If the seal portion 121 is forcibly deformed, the first seal portion 121 may break, and the seal member 100 of the sub-seal member 120 may
In addition, when the control member 110 with the seal member 100 and the sub-seal member 1.20 mounted in this way is fitted into the annular recess of the side block, as described above, This is because the inner diameter of the first seal part 121 fitted into the first seal part 101 of the seal member 100 while being deformed little by little becomes a press-fit dimension with respect to the diameter of the inner inner peripheral surface of the annular recess. Since the seal line length of the seal portion 121 is long, the sliding resistance is large, which increases the rotational resistance of the control member 110.
There is a problem that this may lead to hysteresis and deteriorate controllability.

(Object of the Invention) The present invention has been made by focusing on such conventional problems, and it is possible to improve the performance of the compressor by reducing the rotational resistance of the control member, and to improve the performance of the compressor by reducing the rotational resistance of the control member. When using a superimposed elastic seal member and a sub-seal member with a smooth sliding surface as a seal member to be attached to the vane, the sub-seal member can be assembled to the elastic seal member using The purpose is to provide mold compressors.

(Structure of the Invention) The gist of the present invention for achieving the above object is to include a cam ring whose both sides are closed with side blocks, a rotor rotatably disposed within the cam ring, and a rotor that slides into a vane groove of the rotor. In the vane type compressor, the vane type compressor is provided with movably fitted vanes, and compresses fluid by changing the volume of a cavity defined by the side blocks, the cam ring, the rotor, and the vanes. a bypass port provided in the side block having the suction port; a pressure working chamber provided in the side block having the suction port and communicating with the low pressure chamber side and the high pressure chamber side; At least two pressure receiving plates slidably fitted on one side so as to divide the pressure working chamber into a first chamber communicating with the low pressure chamber side and a second chamber communicating with the high pressure chamber side. an annular control member positioned approximately symmetrically to the side block and fitted in the annular recess of the side block so as to be rotatable in forward and reverse directions to control the opening angle of the bypass port; a biasing member that biases in a direction in which the
a pair of sealing members attached to the control member and sealing between the first chamber and the second chamber and between the low pressure chamber side and the vane back pressure side; and the second chamber and the low pressure chamber side. and a communication path disposed in the communication path that closes the communication path when the pressure on the low pressure chamber side is above a predetermined value and closes the communication path when the pressure on the low pressure chamber side is below a predetermined value. an opening/closing valve mechanism that opens, and each of the seal members is fitted into a fitting groove on an inner circumferential surface of the control member to form a gap between the inner circumferential surface and the inner inner circumferential surface of the annular recess of the side block. and an arcuate first sealing portion for sealing.

a second seal portion concentric with the first seal portion that is fitted into a fitting groove on the outer circumferential surface of the control member to seal between the outer circumferential surface of the control member and the outer inner circumferential surface of the annular recess of the side block; It is formed in a U-shape by a seal portion, a vertical portion rising substantially perpendicularly from one end of each of the first and second seal portions, and a horizontal portion connecting the two vertical portions, and a third seal portion that is fitted into a double-shaped fitting groove formed in a peripheral portion to seal between the peripheral portion of the pressure receiving plate and the annular recess of the side block and the inner surface of the pressure working chamber; integrally provided so as to connect the other ends of the first and second seal parts,
The vane further comprises a fourth seal portion that is fitted into a fitting groove on one side of the control member to seal between the one side of the control member and the inner surface of the annular recess of the side block. Exists in mold compressors.

(Function) In the vane type compressor, each of the first seal portions of the pair of seal members is formed in an arc shape, so that the seal line length of the first seal portion is reduced. The sliding resistance between the annular recess and the annular recess is reduced, and the rotational resistance of the control member is reduced, thereby improving controllability. When using a seal member in which the sub-seal member is superimposed on the elastic seal member, the work of superimposing the sub-seal member on the elastic seal member and assembling the elastic seal member becomes easy.

(Example) Hereinafter, each example of the present invention will be described based on FIGS. 1 to 9. In addition, in the description of each embodiment, the same parts are given the same reference numerals and redundant description will be omitted.

1 to 8 show a first embodiment of the invention.

FIG. 1 is a longitudinal cross-sectional view of a vane compressor according to a first embodiment, and in the figure, 1 is a housing, which is a cylindrical case 2 with an open end surface, and an opening surface on one end surface of the case 2. It consists of a carrier head 3 that is attached with bolts (not shown) so as to close the area.

A discharge port 4 for refrigerant gas, which is a heat medium, is provided on the front upper surface of the case 2, and an inlet port 5 for refrigerant gas is provided on the upper surface of the rear head 3. The discharge port 4 and the suction port 5 communicate with a discharge chamber and a suction chamber, respectively, which will be described later.

A pump body 6 is housed inside the housing 1. The pump body 6 includes a cam ring 7, a front side block 8 and a rear side block 9 mounted on both open ends of the cam ring 7 so as to close the open ends, and a circular block rotatably housed inside the cam ring 7. The main components are a shaped rotor 10 and a rotating shaft 11 of the rotor 10, and the rotating shaft 11 is rotatably supported by bearings 12 and 12 provided on both side blocks 8 and 9, respectively.

The inner circumferential surface of the cam ring 7 has an elliptical shape as shown in FIG. A void chamber 13.13 is defined.

The rotor 10 is provided with a plurality (for example, five) of vane grooves 14 along its radial direction at equal intervals in the circumferential direction, and vanes 15□ to 15. are fitted in such a way that they can appear and retract freely along the radial direction.

The rear side block 9 is provided with suction ports 16.16 symmetrically offset by 180 degrees in the circumferential direction (see FIGS. 2 and 3). ~15. Void chamber 1 divided by
It is arranged at the position where the volume of No. 3 is maximum. The suction ports 16 and 16 penetrate through the rear side block 9 in the thickness direction, and are connected to the suction chamber (low pressure side chamber) 17 between the rear head 3 and the rear side block 9 and the air gap through these suction ports 16. It is in communication with chamber 13.

As shown in FIGS. 1 and 2, a plurality (for example, five) of discharge ports 18 are provided on both side peripheral walls of the cam ring 7, and the inner circumference of the case 2 is provided through these discharge ports 18. A discharge chamber (high pressure side chamber) 19 between the surface and the outer circumferential surface of the cam ring 7 and the gap chamber 13 are communicated with each other. These discharge ports 18 are provided with a discharge valve 20 and a discharge valve stop 21, respectively.

As shown in FIGS. 3 and 5, the rear side block 9 has an annular recess 22 on its one side (rotor 10 side) surface.
An arc-shaped bypass port 23.23 is provided in the annular recess 22 symmetrically with an offset of 180 degrees in the circumferential direction. are communicated. Furthermore, the annular recess 2
2 includes a ring-shaped fitting portion 2 of a ring-shaped control member 24 for controlling the opening angle of the bypass port 23.23.
4' is fitted so as to be rotatable in forward and reverse directions. The control member 24
An arcuate notch 25.25 is symmetrically provided on the outer circumferential edge of the groove 25, deviating 180 degrees in the circumferential direction. Further, on one side of the control member 24, a pressure receiving plate 26 is provided symmetrically and offset by 180 degrees in the circumferential direction. .

262 is integrally provided in a protruding manner. As shown in FIG. 4, these pressure receiving plates 261.26□ are connected to the arc-shaped pressure operating chambers 27.26 and 26.26.
27 so as to be slidable. Inside these pressure working chambers 27 are the pressure receiving plates 26, . 262 into a first chamber 271 and a second chamber 27□, and the first chamber 271
is communicated with the suction chamber 17 via the suction port 16 and the bypass port 23, and the second chamber 27□ is communicated with the discharge chamber 19 via the orifice passage 28, respectively. The one second chamber 27□ and the other second chamber 272 are communicated with each other via the communication path 30. As shown in FIGS. 1 and 4, the communication passage 30 includes a pair of communication holes 30a+30a provided symmetrically across the center of a boss portion 9a projecting from the center of the side surface opposite to the rotor of the rear side block 9. It consists of an annular cavity 30b defined between the protruding end surface of the boss portion 9a and the inner surface of the rear head 3. The communication hole 30
one end of each of the second chambers 27a, 27.a, 30a. To,
Each other end opens into the annular cavity 30b.

By providing the communication passage 30 in the rear side block 9, which is a fixed member, it is easier to form the hole, compared to the case where the communication passage 30 is provided in the control member 24, which is a rotating member. Since both ends can be left open, foreign matter such as chips during hole drilling can be reliably removed, resulting in high reliability. (When providing a communication path on the control member 24 side, it is necessary to fit a blind pin into each one end opening of two holes diagonally opened at both ends so as to intersect with each other, so foreign substances such as chips etc. is difficult to remove.) As shown in FIGS. 1 and 5, a seal member 50 is attached to the control member 24. The seal member 50 includes a pair of elastic seal members 61. made of an elastic material such as rubber.
62, and a pair of sub-seal members 71 and 72 formed in the same shape as the pair of elastic seal members 61 and 62 and made of fluororesin such as Teflon.

As shown in FIGS. 5, 6 and 7(A).

Each of the elastic seal members 61 and 62 is fitted into the fitting groove 33 on the inner circumferential surface of the ring-shaped fitting portion 24' of the control member 24, and is connected to the inner circumferential surface and the annular recess 22 of the rear side block 9.
An annular first seal portion 6 that seals between the inner peripheral surface of the
1a, 62a, and the fitting grooves 34 (only one fitting groove 34 is shown) on both sides of the outer peripheral surface of the ring-shaped fitting part 24', thereby forming the ring-shaped fitting part 24'. First seal parts 61a, 62a and concentric arc-shaped second seal parts 61b, 62b seal between the outer peripheral surface of the carrier side block 9 and the outer inner surface of the annular recess 22 of the side block 9;
The pressure receiving plates 26□, 26 are formed in a U-shape by a vertical portion rising substantially vertically from one end of the first seal portions 1b, 62b and one end of the first seal portions 61a, 62a, and a horizontal portion connecting the two vertical portions.
Fitting grooves 351, 35□ formed in a U-shape on the peripheral edge of 2
The pressure receiving plate 26. ．． 262, the annular recess 22 of the rear side block 9, and the pressure working chamber 27.
third seal portions 61c, 61c that seal between the inner surface of the
, the first seal parts 61a, 62a and the second seal part 61
b, a linear fitting groove 36.b, which is integrally provided so as to slightly rise from the other end of 62b and connect the two other ends, and is formed on one side of the control member 24. .

36□ to seal between one side of the control member 24 and the inner surface of the annular recess 22 of the side block 9.

As shown in FIG. 5 and FIG. 7(B), each of the sub-seal members 71 and 72 is designed to reduce the sliding resistance of the seal member and smooth the rotation of the control member 24. In order to cover each seal portion of the elastic seal members 61 and 62,
As shown in C), it is superimposed on each of the elastic seal members 61.62, and is formed in substantially the same shape as each of the elastic seal members 61.62. That is, each secondary seal member 71.72 has a first portion of each elastic seal member 61.62.
Seal portions 61a, 62a, and second seal portion 61b.

62b, a first seal portion 71a that covers each sliding portion of the third seal portions 61c, 62c and the fourth seal portions 61d, 62d;
72a, second seal portions 71b, 72b, third seal portion 7
1c + 72c and the fourth seal portion 71d.

72d are formed respectively.

As shown in FIGS. 1 and 8, the inner periphery of the center hole 32 of the control member 24 has one side (the high pressure side on the rotor 10 side) of the control member 24 and the other side (low pressure side A tongue seal 80 is interposed to make the gap between the two sides airtight. The lip seal 80 has a U-shaped cross section, and is arranged such that the open side of the U-shaped cross section faces the end surface of the rotor 10.

The seal member 50 and the lip seal 80 allow the third
As shown in FIGS. 1 and 4, between the first chamber 27□ and the second chamber 27□, as shown in FIGS.
4 and the inner and outer circumferential surfaces of the annular recess 22 of the side block 9 and between the low pressure side and the high pressure side of the control member 24 are airtightly sealed.

As shown in FIGS. 1 and 5, the control member 24 is biased by a coiled spring 37, which is a biasing member, in a direction that increases the opening angle of the bypass port 23 (clockwise in FIG. 3). has been done.

This spring 37 is fitted onto the outer periphery of a boss portion 9a of the rear side block 9 extending toward the suction chamber 17 side. One end 37a of this spring 37 is connected to the boss portion 9a, and the other end 37b is connected to the control member 24, respectively.

The other second chamber 27□ communicates with the suction chamber 17 via a communication passage 38 as shown in FIGS. 1 and 4,
An on-off valve mechanism 39 is provided in the communication path 38 . The opening/closing valve mechanism 39 opens and closes in response to the pressure on the suction chamber 17 side (low pressure chamber side), and has a bellows 40 and a case 4.
1, a ball valve body 42, and a spring 43 that biases the ball valve body 42 in the valve closing direction. The bellows 40 is located within the suction chamber 17 and is extendably and retractably arranged with its axis parallel to that of the rotating shaft 11.

The bellows 40 is in a contracted state when the pressure on the side of the suction chamber 17 is above a predetermined value, and is in an expanded state when it is below a predetermined value. The case 41 is mounted in the mounting hole 9b of the rear side block 9 and faces the bellows 40. Holes 41a, 4 at the center of both end faces of the case 41
1b constitutes the communication passage 38 together with the hole 9C of the rear side block 9.

The ball valve body 42 is disposed inside the case 41 and opens and closes a hole 41b on one side (bellows side) of the case 41.

The spring 43 is interposed between the other inner surface of the case 41 and the ball valve body 42. When the pressure on the suction chamber 17 side is above a predetermined value and the bellows 40 is in a contracted state, the hole 41b on one side of the case 41 is closed by the ball valve body 42, and the pressure on the suction chamber 17 side is reduced to a predetermined level. When the bellows 40 is in an extended state due to the setting value or less, the bellows 4
The tip of a rod 42a protruding from one side of the case 41 (the surface facing the case 41) and loosely fitted into the hole 41b of the one side of the case 41 opens the ball valve body 42 against the biasing force of the spring 43. By pressing toward the valve side, the hole 41b on one side of the case 41 is opened.
is designed to be opened.

Next, the procedure for assembling the lip seal 80 and the seal member 50 will be explained.

First, the lip seal 80 is fitted into the inner peripheral surface of the center hole 32 of the control member 24, and each fitting groove 33.3 of the control member 24 is fitted with the lip seal 80.
4.35. ．． Seal portions 61a of each elastic seal member 61, 62 at 352, 36□, and 36□.

62a, 61b, 62b, 61c, 62c and 61d.

62d is fitted.

Next, after putting the third seal part 71c of the sub-seal member 71 over the third seal part 61c of the elastic seal member 61, while pulling the sub-seal member 71, the first seal part 71c
a, the second seal portion 71b and the fourth seal portion 71d are connected to the first seal portion 61a and the second seal portion 6 of the elastic seal member 61;
1b and the fourth seal part 61d, respectively, and then release the hands. As a result, each seal part of the sub-seal member 71 overlaps each seal part of the elastic seal member 61, as shown in FIG. 7(C). The sub seal member 71 is attached to the elastic seal member 61 in the assembled state. The auxiliary seal member 72 is attached to the elastic seal member 62 using the same procedure. In this way, the assembly of the lip seal 8o and the seal member 50 is completed, and the lip seal 80 hermetically seals the low pressure side and the high pressure side of the control member 24, and the pair of elastic seal members 61 and 62 , between the first chamber 271 and the second chamber 27□ as shown in FIGS. 3 and 4, and the inner and outer peripheral surfaces of the ring-shaped fitting portion 24' of the control member 24 as shown in FIG. Annular recess 2 of trap side block 9
The space between the inner and outer circumferential surfaces of 2 is airtightly sealed.

Next, the operation of the vane compressor of the present invention having the above configuration will be explained.

The rotary shaft 11 is rotated in relation to the engine of the vehicle, and the rotor 1
0 rotates clockwise in FIG. 2, the vanes 15. ~1
55 protrudes in the radial direction from the revane groove 14 due to centrifugal force and vane back pressure, and rotates together with the rotor 10 while its tip surface slides on the inner peripheral surface of the cam ring 7, and each of the vanes 15□ to 15. In the suction stroke to expand the volume of the cavity chamber 13 divided by
A refrigerant gas, which is a heat medium, is sucked into the cavity, the refrigerant gas is compressed in a compression stroke to reduce the volume of the void chamber 13, and the discharge valve 20 is opened by the pressure of the compressed refrigerant gas in a discharge stroke at the end of the compression stroke. The valve is opened, and the compressed refrigerant gas is supplied to a heat exchange circuit of an air conditioner (not shown) through the discharge port 18, the discharge chamber 19, and the discharge port 4 in this order.

During operation of such a compressor, the pressure in the suction chamber 17, which is the low pressure side, is introduced into the first chamber 278.271 of both pressure working chambers 27.27 through the suction boat 16,
Further, the pressure inside the discharge chamber 19, which is on the high pressure side, is introduced into the second chambers 27□, 27□ of both pressure working chambers 27.27 through the orifice passage 28. Therefore, the first chamber 27
The sum of the pressure inside □ and the biasing force of the spring 37 (the force that presses the control member 24 in the direction that increases the opening angle of the bypass port 23, that is, the force that rotates it clockwise in FIG. 3) and the Control according to the differential pressure between the pressure in the chamber 27□ of No. 2 (the force that presses the control member 24 in the direction that the opening angle of the bypass port 23 becomes smaller, that is, the force that rotates it counterclockwise in FIG. 3). The member 24 rotates to control the opening angle of the bypass port 23, thereby controlling the compression start timing and controlling the discharge volume.

That is, when the compressor is operated at low speed, the pressure of refrigerant gas (suction pressure) in the suction chamber 17 is relatively high, so the bellows 40 of the on-off valve mechanism 39 contracts, and the ball valve body 42 closes the communication path 38. In the closed state (the state shown in FIG. 1), the pressure in the discharge chamber 19 is supplied to the second chamber 272, and the pressure in the second chamber 27□ is equal to the pressure in the first chamber 271. By overcoming the sum of the biasing force of the spring 37 and the biasing force of the spring 37, the control member 24 rotates to the rotation limit position in the counterclockwise direction in FIG. 3 and is held at that position. As shown by the solid line in the figure, the entire bypass port 23 is closed (the opening angle is zero). Therefore, all of the refrigerant gas sent into the gap chamber 13 from the suction port 16 is compressed and discharged, so that the discharge capacity of the compressor is maximized and the compressor is in full operation.

Next, when the compressor enters a high-speed operation state, the suction pressure in the suction chamber 17 decreases, so the bellows 4 of the on-off valve mechanism 39
0 expands and the rod 42a connects the ball valve body 42 with the spring 43.
The communication passage 38 is opened in order to press the valve toward the valve opening side against the urging force of the valve. As a result, the pressure inside the second chamber 272 is reduced to the communication path 38 (hole 9c).

41a and 41b) into the suction chamber 17 on the low pressure side. The pressure within the
As a result, the control member 24 rotates clockwise in FIG.
When the notch 25 of the control member 24 matches the bypass port 23, the bypass port 23 opens as shown by the dashed line in FIG. Therefore, the refrigerant gas sent from the suction boat 16 into the cavity chamber 13 is transferred to the bypass port 2.
3 to the suction chamber 17, the compression start time is delayed by the amount that the bypass port 23 is opened, and the amount of compressed refrigerant gas in the cavity chamber 13 decreases, resulting in a decrease in the discharge capacity of the compressor. The unit is in operation.

Note that the opening angle of the bypass port 23 is the same as that of the first chamber 2.
71 and the force of the spring 37, and the second chamber 27. The rotational position of the control member 24 changes continuously according to changes in the pressure (suction pressure) in the suction chamber 17, which is the low pressure side, so the compressor continuously variable capacity control is possible. Further, although the pressure of the protrusion chamber 19, that is, the discharge pressure, is introduced into the second chamber 27, the pressure that acts to press the vanes 151 to 15 degrees in the protrusion direction, that is, the vane back pressure, is also introduced. You may also do so.

In addition, in the first embodiment, the pair of elastic seal members 61 and 62 are made to have the same shape.

If the pair of sub-seal members 71.72 have the same shape, the elastic seal member 61.62 and the sub-seal member 71.7
2 can be improved in manufacturing efficiency, thereby reducing manufacturing costs.

Note that in the first embodiment, the sealing member 50 is composed of a pair of elastic members 61.62 and a pair of sub-sealing members 71.72, and the pair of sub-sealing members 71.72 are composed of a pair of elastic members 61. .62 and the mating seal surface, for example, the inner and outer peripheral surfaces of the annular recess 22 of the rear side block 9, the sliding surface portion of the pair of elastic members 61 and 62 with the mating member is entirely A pair of sub-seal members 7
1°72, the sliding resistance becomes extremely small, and the control member 24 rotates smoothly.
This has the advantage of increased controllability.

Furthermore, in the first embodiment, since the lip seal 80 rotates together with the control member 24, the lip seal 80 does not provide sliding resistance to the control member 24.

Further, in the first embodiment, the pair of sub-seal members 71, 72 are made of fluororesin such as Teflon, but the sub-seal members 71, 72 may be made of any material having a smooth sliding surface. For example, the sub-seal members 71 and 72 may be made of pressed iron.

Furthermore, in the first embodiment, the sealing member 50 is replaced with a pair of elastic sealing members 61 and 62 and a pair of sub-sealing members 7.
1.72, however, the present invention is not limited to this, and the sealing member may be a pair of elastic sealing members 61.72.
Needless to say, it may be configured with only 62.

In addition, in the first embodiment, each of the elastic seal members 61
．． As shown in FIG.
The fourth seal portion 61d is formed by vertical portions extending slightly upward from 1b and 62b, respectively, and a horizontal portion connecting the two vertical portions.

62d has the advantage of improved sealing performance. However, the sealing member of the present invention is not limited to this, and the fourth sealing portions 61d, 62d of each of the elastic sealing members 61, 62 are replaced with the first sealing portions 61a, 62d.
2a and the second seal portion 61b.

It may be formed so as to be located substantially on the same plane as 62b.

Next, a second embodiment of the present invention will be described with reference to FIG.

In this second embodiment, a lug seal 80' is used to airtightly seal the low pressure side and the high pressure side of the control member 24 to the rotor 10.
The other configuration is the same as that of the first embodiment.

Note that in the case of the second embodiment as well, the lip seal 80'' rotates together with the control member 24, as in the case of the first embodiment. It will not cause sliding resistance.

(Effects of the Invention) According to the vane compressor according to the present invention, a bypass port is provided in a side block having a suction boat, a pressure working chamber is provided in the side block that communicates with a low pressure chamber side and a high pressure chamber side, At least a pressure receiving plate slidably fitted in the pressure working chamber so as to divide the pressure working chamber into a first chamber communicating with the low pressure chamber and a second chamber communicating with the high pressure chamber. An annular control member is provided at a substantially symmetrical position on one side and is fitted in the annular recess of the side block so as to be rotatable in forward and reverse directions to control the opening angle of the bypass port, and is attached to the control member; A pair of sealing members are provided for sealing between the first chamber and the second chamber and between the low pressure chamber side and the back pressure side of the vane, and the inner circumferential surface of the control member and the outer inner circumference of the annular recess are provided. By forming each of the first seal portions of the pair of seal members that seal between the surfaces into an arc shape, the seal line length is shortened and the sliding between the first seal portions and the annular recess is reduced. The resistance is reduced and the rotational resistance of the control member is reduced, thereby improving controllability and improving the performance of the compressor.

Further, a pair of seal members attached to the control member,
a pair of elastic seal members, formed in the same shape as the elastic seal members, one side overlapping the elastic seal members;
and a sub-seal member having a smooth sliding surface on the other side, each first of the pair of elastic seal members sealing between the inner circumferential surface of the control member and the outer inner circumferential surface of the annular recess. By forming the seal portion and the first seal portion of the sub-seal member corresponding to each of the first seal portions into an arc shape,
With each of the elastic seal members attached to the control member, when assembling the first seal part of each of the sub-seal members by overlapping the first seal part of each of the elastic seal members, the circle of the sub-seal member is Since there is an escape area in the arc-shaped first seal part, the assembling process becomes easier, and the inner diameter of the arc-shaped first seal part of the sub-seal member is smaller than the diameter of the inner circumferential surface of the annular recess. Therefore, the sliding resistance between the inner inner circumferential surface and the arc-shaped first seal portion of the sub-seal member is reduced, and the rotational resistance of the control member is thereby reduced. This improves the performance of the compressor.

[Brief explanation of the drawing]

1 to 8 show a first embodiment of the present invention,
Figure 1 is a longitudinal sectional view of a vane compressor, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, Figure 3 is a sectional view taken along the line ■-■ in Figure 1, and Figure 4. is a sectional view taken along line IV-IV in FIG. 1, FIG. 5 is an exploded perspective view of the main parts, FIG. 6 is an exploded perspective view showing the relationship between the elastic seal member and the control member, and FIG. 7 (A) 7(C) is a perspective view of the elastic seal member, FIG. 7(CB) is a perspective view of the sub-seal member, FIG. 9 is a sectional view similar to FIG. 1 showing the second embodiment of the present invention, FIGS. 10 and 11 are conventional examples, and FIG. 10 shows an elastic seal member. An exploded perspective view showing the relationship with the control member, FIG. 11(A) is a perspective view of the elastic sealing member, FIG. 11(B) is a perspective view of the sub-sealing member,
FIG. 11(C) is a perspective view showing a state in which the elastic seal member and the sub-seal member are overlapped. 7...Cam ring, 8...Front side block. 9... Rear side block, 10... Rotor, 13
...Void chamber, 14...Vane groove, 151-15.・
...Bane. 16... Suction port, 17... Suction chamber (low pressure side chamber)
, 19...Discharge chamber (high pressure side chamber), 22...Annular recess, 23...Bypass port, 24...Control member, 2
61゜262...Pressure receiving plate, 27...Pressure operating chamber, 2
71...First chamber, 27□...Second chamber, 33,3
4,35. ．． 352°361.36□・・・Fitting groove, 3
7... Spring (biasing member), 38... Communication path,
39... Opening/closing valve mechanism, 5°... A pair of seal members,
61.62...Pair of elastic seal members, 61a, 62
a-first seal portion, 61b; 62b-...Second seal part, 61c, 62cm Third seal part, 61d, 62d...Fourth seal part, 71.7
2... Pair of sub-seal members, 71a, 72a... First seal portion, 71b, 72b... Second seal portion, 71
c, 72cm third seal part, 71d, 72d... fourth
Seal part.

Claims (1)

[Claims] 1. A cam ring whose both sides are closed with side blocks;
A cavity defined by the side block, the cam ring, the rotor, and the vane includes a rotor rotatably disposed within the cam ring, and a vane slidably fitted in a vane groove of the rotor. In a vane type compressor that compresses fluid by volume variation, a bypass port is provided in the side block having the suction port of the two side blocks, and a bypass port is provided in the side block having the suction port and is a low pressure compressor. a pressure working chamber communicating with the chamber side and the high pressure chamber side; a first chamber communicating within the pressure working chamber with the low pressure chamber side; and a second chamber communicating with the high pressure chamber side. The bypass port has at least two pressure-receiving plates slidably fitted in substantially symmetrical positions on one side so as to partition the bypass port. an annular control member that controls the opening angle; a biasing member that urges the control member in a direction in which the opening angle of the bypass port becomes larger; a pair of sealing members for sealing between the chamber and between the low pressure chamber side and the vane back pressure side; a communication passage communicating between the second chamber and the low pressure chamber side; an opening/closing valve mechanism that closes the communication passage when the pressure on the low pressure chamber side is above a predetermined value and opens the communication passage when the pressure on the low pressure chamber side is below the predetermined value; an arcuate first seal portion that is fitted into a fitting groove on an inner circumferential surface of the control member to seal between the inner circumferential surface and an inner inner circumferential surface of the annular recess of the side block; and the first seal part and a concentric arc-shaped second seal part that are fitted into a fitting groove on the outer peripheral surface of the control member to seal between the outer peripheral surface of the control member and the outer inner peripheral surface of the annular recess of the side block; , is formed in a U-shape by a vertical portion rising substantially perpendicularly from one end of each of the first and second seal portions, and a horizontal portion connecting the two vertical portions; a third seal portion that is fitted into the formed U-shaped fitting groove to seal between the peripheral edge of the pressure receiving plate and the annular recess of the side block and the inner surface of the pressure working chamber; The second seal portion is integrally provided so as to connect the other ends of the second seal portion, and is fitted into a fitting groove on one side of the control member so that the one side of the control member and the inner surface of the annular recess of the side block are connected to each other. 4th seal between
A vane compressor characterized by comprising a seal section. 2. The pair of seal members are formed in the same shape as the elastic seal members to be fitted into each of the fitting grooves, one side is overlapped with the elastic seal member, and the other side is formed to have the same shape as the elastic seal members. and a sub-sealing member having a smooth sliding surface, each first sealing portion of the pair of elastic sealing members sealing between the inner circumferential surface of the control member and the outer inner circumferential surface of the annular recess. The vane type compressor according to claim 1, wherein the first seal portions of the sub-seal members corresponding to the first seal portions are each formed in an arc shape.