JP2000234595A - Variable displacement type gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas compressor to reduce weight without the occurrence of worsening of deformation and controllability. SOLUTION: This gas compressor comprises a rotor rotatably arranged in a cylinder chamber the inner periphery of which is formed in an oval cylindrical shape; a vane mounted movably forward and backward in a vane groove arranged in the rotor; a control plate to control a volume of gas sucked in the cylinder chamber through rotation of the rotor; and a drive piston to rotationally drive the control plate, the gas compressor compressing gas. In this case, a plate driving means comprises a recessed part 22a at which a drive pin 20 arranged at a control plate 12 is slidably locked; a pin fit part 22 formed of a high rigidity material; and a control pressure holding part 23 mounted in a state to be coupled to the pin fit part 22 and formed of a light material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas compressor, and more particularly, to a variable displacement gas compressor which is reduced in weight without causing deformation or deterioration in controllability.

[0002]

2. Description of the Related Art FIG. 2 is a sectional view of a gas compressor conventionally used in a car air conditioner or the like. As shown in the figure, a rotor 5 is rotatably provided in a cylinder chamber 4 having an elliptical cylindrical inner periphery formed by a front head 1, a rear side block 2 and a cylinder 3. As shown in FIG. 3 in a cross-sectional view taken along the line A, vanes 7 are respectively mounted on the plurality of vane grooves 6 so as to be able to move forward and backward.

The vane 7 divides the cylinder chamber 4 into a plurality of compression chambers 8. The compression chambers 8 repeatedly change their capacity by the rotation of the rotor 5, and compress the low-pressure refrigerant gas by the change in capacity. I have. The compressed high-pressure refrigerant gas is discharged to the discharge chamber 11.

As shown in FIG. 2, a control plate 12 having a notch 12a is rotatably provided between the front head 1 and the cylinder 3. In this gas compressor,
By rotating the control plate 12, the position of the notch 12a is changed, and the compression start angle is changed to change the discharge capacity.

The control plate 12 is driven to rotate by plate driving means 15 as shown in FIG. A drive pin 20 is press-fitted into the control plate 12, and the plate drive means 15 changes the movement of the piston 16 which advances and retreats by the control pressure PS into the rotational movement of the control plate 12 via the drive pin 20. Plate driving means 1
The drive pin 20 and the piston 16 have a clearance fit to change the linear motion of 5 into a rotary motion.

[0006]

However, the conventional gas compressor has the following problems.

As described above, in the conventional gas compressor, the discharge capacity can be changed by rotating the control plate 12.
0 and the material of the piston 16 is iron-based for the following reasons.

[0008] The control plate 12 is
In order not to be deformed by the needle bearing 17 (see FIG. 2) provided on the opposite side of the plate driving means 15 in order to rotate smoothly, and to prevent deformation by the indoor pressure of the compression chamber 8, an iron-based material is used. , Drive pin 20
Uses an iron-based material in order not to lower the press input at high temperatures due to the difference in thermal expansion coefficient with the control plate 12,
The piston 16 is made of an iron-based material in order to prevent the wear from increasing or deforming due to the line contact with the hard iron-based drive pin 20. In particular, when dithering (microtremor) is performed to increase the response of the piston 16,
The drive pin 2 is used in the direction of increasing wear and deformation.
There is a problem that it is not possible to change the 0 or the piston 16 from an iron-based material to a lightweight material.

For this reason, the control plate 12, the drive pin 20, and the piston 16 must be heavy parts. However, the gas compressor used in a car air conditioner or the like has a low fuel efficiency. Since it depends on the weight of the car itself, it is important to make it as light as possible to address global environmental issues.

It is conceivable to make the piston 16 hollow to reduce the weight. However, according to this, the capacity of the control pressure chamber 19, which must be filled with oil, increases. When the gas compressor is started, air bubbles are present in the control pressure chamber 19, which may deteriorate controllability.

Further, it is conceivable to apply hard chrome plating to a lightweight material, but in this case, the cost becomes extremely high and the strength becomes a problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas compressor which realizes weight reduction without causing deformation and deterioration of controllability.

[0013]

SUMMARY OF THE INVENTION Accordingly, a gas compressor according to the present invention is provided with a rotor rotatably provided in a cylinder chamber having an inner circumference of an elliptical cylinder and a vane groove provided in the rotor so as to be movable forward and backward. And a control plate that controls the volume of gas sucked into the cylinder chamber by the rotation of the rotor, and a drive piston that drives the control plate to rotate. In the compressor, the plate driving means has a concave portion for slidably locking a driving pin provided on the control plate, and a pin fitting portion formed of a highly rigid material,
And a control pressure holding portion formed of a lightweight material and attached to the pin fitting portion.

Further, the pin fitting portion is formed of an iron material, and the control pressure holding portion is formed of an aluminum material.

Further, the pin fitting portion and the control pressure holding portion are connected by a press-fit pin.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a gas compressor according to the present invention will be described in detail with reference to FIG.

In FIG. 1, the same members as those of the conventional members shown in FIGS. 2 to 4 are denoted by the same reference numerals.

This gas compressor has a control plate 12 and a drive piston 21 as shown in FIG. The drive piston 21 is connected to a spring 28, and the pin fitting portion 22
And a control pressure holding unit 23.

A recess 22a is formed in the pin fitting portion 22, and the recess 22a is engaged with the drive pin 20 erected on the control plate 12 and is formed of an iron-based material. Therefore, the drive piston 21 slides linearly and interlocks with the control plate 12 via the drive pin 20, but does not wear or deform due to line contact with the drive pin 20. The control pressure holding portion 23 is formed with a cylindrical convex portion 23a, and the convex portion 23a is press-fitted into a concave portion 22a formed in the pin fitting portion 22 so that the control pressure holding portion 23 and the pin fitting portion 22 are formed. And are integrally joined. Since the control pressure holding portion 23 is formed of aluminum and has a larger thermal expansion coefficient than the iron-based material in which the pin fitting portion 22 is formed, even if the gas compressor becomes hot during operation, the control pressure holding portion 23 The pin fitting portion 22 does not come off.

The control pressure holding unit 23 includes the front head 1
It is slidably arranged on the cylinder 24 provided in the inside, and no excessive load such as line contact is applied.
There is no need to use a strong iron-based material, and lightweight aluminum can be used. The front head 1
Is usually formed of aluminum. If the control pressure holding portion 23 is formed of aluminum, the coefficient of thermal expansion becomes the same, and the control pressure holding function does not decrease even at high temperatures.

The control pressure chamber 26 communicates with the oil sump 18 via a control valve 27 which is opened and closed based on a change in pressure in the intake chamber 13. The control pressure chamber 26 receives the lubricating oil in the oil sump 18 in the discharge chamber. The high pressure refrigerant gas pressure of 11 flows in.

Next, the operation of the gas compressor configured as described above will be described.

According to this gas compressor, when the operation is stopped, there is no difference between the suction pressure of the suction chamber 13 and the discharge pressure of the discharge chamber 11, and the driving piston 21 is pushed by the spring 28 to move the gas in the sliding range. Located at the bottom, the control plate 12 is set to rotate clockwise to minimize compression capacity.

When the operation is started, the suction pressure and the discharge chamber 11
The driving piston 21 generates a propulsive force corresponding to the discharge pressure of the spring 28, and the driving piston 21 slides in the direction of the spring 28 as shown by an arrow a in FIG. When the drive piston 21 slides, its propulsive force is transmitted from the recess 22 a through the drive pin 20 to the control plate 12.
The control plate 12 rotates counterclockwise as shown by the arrow B in the figure, and is controlled so that the discharge amount becomes constant.

As described above, according to the gas compressor of the present embodiment, the linear motion of the drive piston 21 sliding up and down is controlled by the control plate 12 via the drive pin 20.
However, since the driving pin 20 and the driving piston 21 are made of iron and the driving piston 21 is made of the same aluminum as the front head 1, the driving pin 20 and the driving piston 21 are made of the same material.
And the drive piston 21 does not deteriorate due to increased wear or deformation, and the controllability is maintained even at high temperatures,
The weight can be reduced.

In the above embodiment, the drive pin 20 and the pin fitting portion 22 are made of iron and the control pressure holding portion 23
Although the embodiment using aluminum has been described above, the present invention is not limited to this, and the drive pin 20 and the pin fitting portion 2
A relatively hard and rigid material may be used for 2, and a relatively light and lightweight material may be used for the control pressure holding portion 23.

[0027]

According to the gas compressor of the present invention, there is provided a rotor rotatably provided in a cylinder chamber having an inner periphery in an elliptical cylindrical shape, and a vane mounted in a vane groove provided in the rotor so as to advance and retreat. A variable displacement gas compressor comprising: a control plate for controlling the volume of gas sucked into the cylinder chamber by rotation of the rotor; and a drive piston for driving the control plate to rotate, and compressing and discharging gas. A pin fitting portion formed of a highly rigid material having a concave portion in which the driving piston slidably locks a driving pin provided on the control plate, and a light-weight material which is attached to and attached to the pin fitting portion. With the control pressure holding portion provided, the drive pin and the drive piston do not increase in wear or deform to reduce the function, and also have high controllability even at high temperatures. Dripping, it is possible to reduce the weight.

Further, since the pin fitting portion is formed of an iron material and the control pressure holding portion is formed of an aluminum material, the weight can be reliably reduced.

Further, since the pin fitting portion and the control pressure holding portion are connected by a press-fit pin, the pin fitting portion and the control pressure holding portion can be firmly connected, and the drive piston can be connected to the control piston. It can slide smoothly.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part of a gas compressor according to the present invention.

FIG. 2 is a cross-sectional view of a conventional gas compressor.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory view of a conventional plate driving unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front head 2 Rear side block 3 Cylinder 4 Cylinder chamber 5 Rotor 6 Vane groove 7 Vane 8 Compression chamber 11 Discharge chamber 12 Control plate 15 Plate driving means 16 Piston 20 Drive pin 21 Drive piston 22 Pin fitting part 22a Recess 23 Control pressure holding part 26 Control pressure chamber 27 Control valve 28 Spring

Claims (3)

[Claims] 1. A rotor rotatably provided in a cylinder chamber having an inner periphery of an elliptical cylinder, a vane mounted on a vane groove provided on the rotor so as to be able to advance and retreat, and the cylinder chamber being rotated by rotation of the rotor. A variable displacement gas compressor that includes a control plate that controls the volume of gas sucked into the device, and a drive piston that rotationally drives the control plate, and that compresses and discharges the gas, wherein the drive piston is provided on the control plate. A pin fitting portion formed of a highly rigid material having a concave portion that slidably locks the driven pin, and a control pressure holding portion formed by attaching and being attached to the pin fitting portion and formed of a lightweight material. A gas compressor comprising: 2. The gas compressor according to claim 1, wherein the pin fitting portion is formed of an iron material, and the control pressure holding portion is formed of an aluminum material. 3. The gas compressor according to claim 1, wherein the pin fitting portion and the control pressure holding portion are connected by a press-fit pin.