JPH0355835Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a variable capacity vane type rotary compressor used as a refrigerant compressor for, for example, an automobile air conditioner.

(Prior art) In general, in a vane type rotary compressor, in order to variably control the discharge amount, a bypass port that opens inside the cam ring is provided on a side plate that seals one end of the cam ring, and the opening position is aligned with the cam surface. By moving along the vane, the compression start point of the vane is changed and the discharge amount is variably controlled.

As a conventional variable capacity vane type rotary compressor of this type, for example, one described in Japanese Utility Model Application Publication No. 187983/1983 is known. In this compressor, a bypass port opening into the working chamber is formed in the front plate, and a movable plate having a bypass opening for adjusting the opening position of the bypass port is interposed between the front plate and the rotor. Then, this movable plate is rotated around the rotor axis by an actuator, and the opening position of the bypass port is changed to variably control the discharge amount.

On the other hand, the actuator is driven by the operating pressure supplied from the control valve, and the control valve is controlled by a control mechanism consisting of a control cylinder, a bellows mounted in the control cylinder, and an adjustment member. The atmosphere and suction gas of the compressor are introduced into the control cylinder of the control mechanism across the bellows, and the bellows deforms due to the differential pressure between the atmospheric pressure and the suction pressure, and the deformation of the bellows drives the control valve. controlled. The capacity control characteristics of the compressor can be changed by adjusting the amount of deformation of the bellows with respect to the differential pressure acting on the bellows using the adjusting member. Such a control mechanism is provided below the cam ring with its displacement control characteristics adjusted in advance, and both ends thereof are held between a pair of side plates.

(Problem to be solved by the invention) However, in such conventional variable capacity vane type rotary compressors, the control mechanism adjusts its adjustment member and sets the capacity control characteristics of the compressor in advance. Later, it was installed below the cam ring, and both ends were sandwiched between a pair of side plates, so if you tried to adjust the control mechanism after assembling the compressor, you would have to remove the front side plate, disassemble the compressor, and control it. The mechanism must be taken out. In other words, when the desired capacity control characteristics cannot be obtained due to variations in the components of the control mechanism, or when adjusting the matching between the compressor and the air conditioner, the adjusting member cannot be adjusted from outside the compressor. You will need to disassemble it, take out the control mechanism, and adjust the adjustment member. Therefore, a large amount of man-hours is required to adjust the capacity control characteristics of the compressor, and a housing for housing the control mechanism must be provided in order to attach the control mechanism to the compressor, which increases the number of parts. do. As a result, there was a problem in that the manufacturing cost of the compressor increased.

(Purpose of the invention) Therefore, the present invention forms the control cylinder of the control mechanism integrally with the casing of the compressor, and
By forming an opening in the control cylinder that opens to the outside of the casing, attaching an adjustment member to the opening, and adjusting the adjustment member from the outside, the control mechanism can be mounted without a housing and easily from the outside. The aim is to reduce manufacturing costs by making it possible to adjust the capacity control characteristics of the compressor.

(Means for solving the problem) In order to achieve the above purpose, the variable capacity vane type rotary compressor according to the present invention bypasses the compressed gas of the compressor to the suction side and changes the flow rate of the compressed gas discharged. A movable plate, an actuator that drives the movable plate, a control valve that supplies control pressure to the actuator to operate the actuator, a control mechanism that controls the control valve, and houses the movable plate, the actuator, the control valve, and the control mechanism. a casing, wherein the control mechanism includes a control cylinder, a first introduction chamber and a second introduction chamber provided in the control cylinder, and an operating pressure introduced into the first introduction chamber and the second introduction chamber, respectively. and an adjustment member that adjusts the amount of deformation due to the differential pressure of the defining member, and controls the control valve to operate the actuator. In a variable capacity vane type rotary compressor that changes the discharge amount of the compressor, the control cylinder is formed integrally with the casing, and the control cylinder is formed with an opening that opens to the outside of the casing, and the control cylinder is formed with an opening that opens outward from the casing. An adjustment member is attached to the casing so that the adjustment member can be adjusted from the outside (function). An opening is formed that opens toward the outside, and an adjustment member is attached to the opening so that the adjustment member is adjusted from the outside. Therefore,
The cost of manufacturing the compressor is reduced because the control mechanism is mounted without a housing and the capacity control characteristics of the compressor can be easily adjusted from the outside.

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

1 to 4 are diagrams showing a first embodiment of the present invention.

First, the configuration will be explained. In Figures 1 and 2,
Reference numeral 1 denotes a compressor, and a cylindrical cam ring 2 having a cam surface 2a on the inner periphery is provided inside the compressor 1. Both open ends of the front side (left side in the figure) and rear side (right side in the figure) of the cam ring 2 are sealed by a front plate 3 and a rear plate 4, respectively. A cylindrical rotor 5 is rotatably housed in the cam ring 2 between the front plate 3 and the rear plate 4, and a plurality of vanes 6 are fitted into the rotor 5 so as to be retractable. The cam ring 2, front plate 3, rear plate 4, rotor 5 and vane 6 are housed in a bottomed cylindrical housing 7.
The opening is sealed by a head cover 8 that constitutes a casing that houses a movable plate 13, an actuator 15, a control valve 20, and a control mechanism 35, which will be described later. A suction chamber 9 is defined between the head cover 8 and the front plate 3, and the suction chamber 9 has a working chamber 10 defined by the cam ring 2, the front plate 3, the rear plate 4, the rotor 5, and the vane 6. is connected to. The working chamber 10 communicates with a discharge chamber 11 defined within the housing 7, and refrigerant gas introduced into the working chamber 10 from an air conditioner (not shown) via the suction chamber 9 is compressed within the working chamber 10. and is discharged to the air conditioner via the discharge chamber 11.

An arc-shaped bypass port 12 that opens into the working chamber 10 is formed on the front plate 3.
Bypass port 12 communicates working chamber 10 with suction chamber 9 . A substantially disk-shaped movable plate 13 is rotatably provided between the front plate 3 and the cam ring 2, and the movable plate 13 serves as a bypass opening that changes the opening position of the bypass port 12 formed in the front plate 3. It has a section 14. Movable plate 13
is connected to the bypass port 1 by the bypass opening 14.
The compressed gas of the compressor 1 is bypassed to the suction chamber 9 on the suction side by changing the opening position of the compressor 2, and the flow rate of the compressed gas discharged is changed.

On the other hand, 15 is an actuator provided on the head cover 8, and the actuator 15 is connected to a cylinder 16 and a cylinder 16 as shown in FIG.
It consists of a piston 17 that is slidably inserted into the piston. A return spring 18 is interposed between the upper surface of the cylinder 16 (upper side in FIG. 3) and the piston 17.
is biased downward in Fig. 3. A cylinder chamber 19 is defined in the lower part of the cylinder 16 by the cylinder 16 and the piston 17, and the cylinder chamber 19 receives control pressure from a control valve 20, that is, the compressor 1
The suction pressure or discharge pressure is supplied. Further, the piston 17 is connected to the movable plate 13 via a pin 21, a link 22, and a connecting pin 23, and when control pressure is supplied to the cylinder chamber 19, the piston 17 slides inside the cylinder 16, and the actuator 15 drives the movable plate 13. control valve 20
As shown in detail in FIG. 4, the cam ring 2, the front plate 3, and the head cover 8 are provided with a ball valve 24 that communicates with the discharge chamber 11, and a poppet valve 25 that faces the ball valve 24 and communicates with the suction chamber 9. It consists of The ball valve 24 includes a ball valve body 26, a ball valve seat 27, and a ball valve 24.
The ball valve body 26 is inserted into the ball valve seat part 2.
The back of the ball valve 24 communicates with the discharge chamber 11 through a through hole 29. The poppet valve 25 is composed of a poppet valve body 30 and a poppet valve seat 31, and the poppet valve 25 is connected to a second valve of a control cylinder 32, which will be described later.
It communicates with the suction chamber 9 via the introduction chamber 37. The control cylinder 32 has a bellows 33 connected to the poppet valve body 30 of the poppet valve 25 and an adjusting member 3.
Together with 4, it constitutes a control mechanism 35 that drives and controls the control valve 20. The control cylinder 32 is integrally formed in the lower part of the head cover 8 (lower part in FIGS. 1 and 4), and a bellows 33 forming a defining member is provided inside the control cylinder 32. The bellows 33 defines the inside of the control cylinder 32 into a first introduction chamber 36 and a second introduction chamber 37.
A spring 38 is provided inside to extend the bellows 33 to the right in FIG. 1st
The interior of the introduction chamber 36 is sealed and maintained in vacuum, and the spring 38 and the vacuum work together to act as an operating pressure within the first introduction chamber 36 . Suction pressure is introduced into the second introduction chamber 37 from the suction chamber 9 as an operating pressure, and the bellows 33
and the second introduction chamber 37 respectively, and the control valve 20 is driven. The control cylinder 32 has an opening 32a that opens outward from the head cover 8, and an adjustment member 34 is attached to the opening 32a. The adjustment member 34 is threaded through a nut 40 fixed to the opening 32a by a snap ring 39, and the adjustment member 34 is in contact with the bellows 33 via a stopper 41. Therefore,
The adjusting member 34 can be adjusted from the outside of the compressor 1, moves in the left-right direction in FIG. 4, and can arbitrarily adjust the amount of deformation of the bellows 33 due to the differential pressure via the stopper 41. Note that 42 is a sealing member, and the sealing member 42 is interposed between the control cylinder 32 and the stopper 41 to seal the inside of the second introduction chamber 37.

Next, the effect will be explained.

In FIG. 1, when the rotor 5 is driven by a vehicle engine or the like and rotates, the vanes 6 protrude in the radial direction due to the centrifugal force and the back pressure of the vanes 6, and the tips of the vanes 6 touch the cam ring 2. It rotates while slidingly contacting the cam surface 2a. Then, refrigerant gas in the suction chamber 9 is introduced from an air conditioner (not shown), and the refrigerant gas is compressed in the working chamber 10 and has a high temperature.
It becomes high pressure and is discharged into the discharge chamber 11, and is supplied to the air conditioner through the discharge chamber 11. At this time, the bellows 33 of the control mechanism 35 expands and contracts in accordance with the differential pressure between the vacuum pressure in the first introduction chamber 36 and the suction pressure in the second introduction chamber 37, that is, the differential pressure in the operating pressure, and the ball valve of the control valve 20 Control pressure is supplied to the cylinder chamber 19 of the actuator 15 by opening and closing the valve 24 and the poppet valve 25. Then, the piston 17 operates and the actuator 15 rotates the movable plate 13,
The discharge amount of the compressor 1 is variably controlled.

On the other hand, when manufacturing the compressor 1, there are variations in the components of the control mechanism 35, such as the degree of vacuum inside the bellows 33, the biasing force of the spring 38, and the
If the desired capacity control characteristics cannot be obtained due to variations in the effective pressure-receiving area of the When a compressor is installed in a vehicle, it is necessary to adjust the capacity control characteristics by adjusting the control mechanism 35 so as to keep the evaporation pressure of the evaporator of the air conditioner constant. In this case, the capacity control characteristic of the control mechanism 35 is adjusted by adjusting the amount of deformation of the bellows 33 with respect to the differential pressure using the adjustment member 34 of the control mechanism 35. In this embodiment, the control cylinder 32 of the control mechanism 35 is formed with an opening 32a that opens to the outside of the head cover 8, and the adjustment member 34 is attached to the opening 32a. It can be adjusted to Therefore, since the control mechanism 35 can be adjusted without disassembling the compressor as in the conventional case, the number of man-hours required to adjust the capacity control characteristics of the compressor is significantly reduced. Further, since the control cylinder 32 of the control mechanism 35 is integrally formed with the head cover 8 that constitutes a part of the casing, the number of parts is reduced. As a result, the number of man-hours for adjusting the capacity control characteristics and the number of parts are reduced, and the manufacturing cost of the compressor can be significantly reduced.

Next, another embodiment of the present invention will be described.

FIG. 5 is a diagram showing a second embodiment of the present invention,
This embodiment is an example in which the control mechanism is operated by atmospheric pressure and suction pressure. In FIG. 5, a control cylinder 51 is integrally formed in the head cover 8, and a bellows 52 is provided inside the control cylinder 51.
(defining member) for the first introduction chamber 53 and the second introduction chamber 53
It is defined in an introduction chamber 54. The end of the bellows 52 on the left opening side in the figure is integrally formed with a stopper 55, and the stopper 55 is connected to a sealing member 56.
It is fixed to the opening 51a of the control cylinder 51 via a snap spring 57. The stopper 55 has an adjustment member 5 having an atmospheric pressure introduction hole 58.
9 are screwed together, and the adjusting member 59 is connected to the button 60.
The biasing force of the spring 61 within the bellows 52 is adjusted through. Note that the control cylinder 51, bellows 52, and adjustment member 59 constitute a control mechanism 62. A cap 64 having an atmospheric pressure introduction hole 63 is attached to the adjustment member 59, and the cap 64 prevents water and dust from entering the control mechanism 62. Then, atmospheric pressure as an operating pressure is introduced into the first introduction chamber 53 through the atmospheric pressure introduction hole 63 and the atmospheric pressure introduction hole 58, and suction pressure as an operating pressure is introduced into the second introduction chamber 54. The bellows 52 deforms in response to the differential operating pressure and drives the control valve 20. Therefore, when changing the capacity control characteristics of the compressor, the adjusting member 59
By removing the cap 64 and adjusting the adjusting member 59 of the control mechanism 62, the amount of deformation of the bellows 52 relative to the differential pressure is adjusted. The other configurations and operations are the same as those in the first embodiment, and their explanations will be omitted.

In each of the embodiments, the casing that integrally forms the control cylinder is used as a head cover, but the present invention is not limited to this. That is, any location may be used as long as the control cylinder can be integrally formed and a portion of the control cylinder can be opened to the outside of the casing. Further, in each of the embodiments, the defining member is formed of a bellows, but various members such as a diaphragm or a piston can be used as long as they are deformed or displaced by differential pressure.

(Effects) According to the present invention, the control cylinder of the control mechanism is integrally formed with the casing of the compressor, and
The control cylinder is formed with an opening that opens to the outside of the casing, and the adjustment member is attached to the opening to adjust the adjustment member from the outside. Therefore, the control mechanism can be installed without a housing, and the adjustment member can be adjusted from the outside. The capacity control characteristics of the compressor can be easily adjusted, and manufacturing costs can be reduced.

[Brief explanation of drawings]

1 to 4 are views showing a first embodiment of a variable capacity vane type rotary compressor according to the present invention, in which FIG. 1 is a longitudinal cross-sectional view, FIG. 2 is a cross-sectional view, and FIG. 3 is a cross-sectional view. FIG. 4 is an enlarged sectional view showing the control valve and control mechanism, and FIG. 5 is a second embodiment of the variable capacity vane rotary compressor according to the present invention. FIG. 2 is an enlarged cross-sectional view showing an exemplary control valve and control mechanism. 1... Compressor, 8... Head cover (casing), 13... Movable plate, 15... Actuator,
20... Control valve, 32... Control cylinder, 32a
...Opening, 33...Bellows (defining member), 3
4... Adjustment member, 35... Control mechanism, 36... First introduction chamber, 37... Second introduction chamber.

Claims (1)

[Scope of utility model registration request] Bypassing compressed gas from the compressor to the suction side,
A movable plate that changes the flow rate of compressed gas to be discharged, an actuator that drives the movable plate, a control valve that supplies control pressure to the actuator to operate the actuator, a control mechanism that controls the control valve, a movable plate, a casing housing an actuator, a control valve, and a control mechanism, the control mechanism defining a control cylinder, a first introduction chamber and a second introduction chamber provided in the control cylinder, and a first introduction chamber and a second introduction chamber; 2. A defining member that deforms and drives the control valve according to the differential pressure between the operating pressures introduced into the two introducing chambers, and an adjusting member that adjusts the amount of deformation due to the differential pressure of the defining member. In a variable capacity vane type rotary compressor that changes the discharge amount of the compressor by controlling a valve and operating an actuator, the control cylinder is formed integrally with the casing, and the control cylinder has an opening outward from the casing. 1. A variable capacity vane type rotary compressor, characterized in that an opening is formed, and an adjustment member is attached to the opening so that the adjustment member can be adjusted from the outside.