JPH05149266A - Scroll compressor - Google Patents

Abstract

PURPOSE:To provide a scroll compressor wherein a fixed scroll and a turning scroll are placed always in a condition of optimum contact, even when an operational condition is changed, to decrease a frictional loss, wearing and leakage and also not to generate vibration and noise. CONSTITUTION:In a scroll compressor in which gas is. compressed by rotating a turning scroll 50 not on its own axis but around a shaft while bringing the turning scroll 50 into contact with a fixed scroll 30, actuators 711 to 734 for supporting the fixed scroll 30 displacementdrivably in a direction of axis and at a right angle to the axis are provided. These actuators 711 to 734 are controlled by a signal of showing an operational condition to adjust a position of the fixed scroll 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a means for improving the meshing contact state between an orbiting scroll and a fixed scroll of a scroll compressor.

[0002]

2. Description of the Related Art FIG. 5 is a vertical sectional view of a scroll compressor disclosed in Japanese Patent Laid-Open No. 59-120794. Also,
The improvement of the mechanism for automatically adjusting the orbiting radius of the orbiting scroll is shown in the specification of Japanese Patent Application No. 2-74761.
In FIG. 5, 30 is a fixed scroll having a fixed scroll wrap 34, and the fixed scroll 30 is fixed to the housing 11 via a support member. The orbiting scroll wrap 54 of the orbiting scroll 50 is in contact with the fixed scroll wrap 34 so as to mesh therewith. The orbiting scroll 50 has an Oldham ring 6 which is a rotation preventing mechanism.
While being prevented from rotating by 9, the drive pin 66 is eccentrically provided on the crankshaft 63 of the electric motor 62, and is revolved through the drive bush 65. Working gas is
From the suction pipe 12 into the housing 11, from the suction port 36 into the space between the fixed scroll 30 and the orbiting scroll 50, the orbiting scroll 50 is compressed by the non-revolving revolution of the orbiting scroll while moving toward the center side, and then from the discharge port 37. Discharge pipe 13
Go out. In this scroll compression operation, a closed space is formed between the orbiting scroll 50 and the fixed scroll 30 so as to spirally move toward the center side and reduce in size.
The orbiting outer portion of the orbiting scroll wrap 54 is configured to continuously contact the corresponding portion of the fixed scroll wrap 34. The orbiting scroll 50 is pressed against the fixed scroll 30 in the axial direction by an elastic member or the like.

[0003]

As described above, the conventional scroll compressor is constructed so that the orbiting scroll 50 comes into contact with the fixed scroll 30 with an appropriate pressing force. However, the orbiting speed, gas pressure, Depending on operating conditions such as compression ratio, temperature, etc., it may deviate from the optimum contact state,
If the contact is too strong, friction loss and wear will be large, and if it is too weak, leakage will occur, and if there is fluctuation, vibration noise will occur.

The present invention has been made in order to solve the above-mentioned problems. The scroll is always in an optimum contact state even if the operating conditions change, friction loss and wear are small, leakage is small, and vibration noise due to fluctuation does not occur. The purpose is to obtain a compressor.

[0005]

DISCLOSURE OF THE INVENTION A scroll compressor according to the present invention is provided with drive support means for supporting a fixed scroll so as to be displaceably driven in an axial direction and a direction perpendicular to the axis, and a signal indicating an operating condition of the scroll compressor. Is detected and the drive supporting means is controlled to adjust the position of the fixed scroll.

[0006]

The drive support means provided in the scroll compressor according to the present invention is controlled by a signal indicating an operating condition to displace the fixed scroll in the axial direction and the direction perpendicular to the axis to adjust the position of the fixed scroll. .. This allows
The contact state of the orbiting scroll that meshes with the fixed scroll is always in the optimum state even if the operating conditions change, and there is less friction loss and wear, less leakage, and less vibration noise.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 30 is a fixed scroll, and a spiral fixed scroll wrap 34 is formed on the lower surface of the end plate of the fixed scroll 30 in the figure. on the other hand,
On the upper surface of the end plate of the orbiting scroll 50 in the drawing, a spiral orbiting scroll wrap 54 is formed.
It is arranged and driven so that any one of the parts always comes into contact with and meshes with each other. A boss 56 for driving is formed on the lower surface of the end plate of the orbiting scroll 50 in the drawing. A drive bush 65 is eccentrically provided at the upper end of the crank shaft 63, which is integral with the rotor shaft of the electric motor 62 in the figure, and the drive bush 65 is rotatably fitted to the boss 56 of the orbiting scroll 50. ing. The drive bush 65 automatically adjusts the orbiting scroll wrap 54 to the fixed scroll wrap 34 by using centrifugal force, elastic force or the like to automatically adjust the amount of eccentricity that is the revolution radius for revolving the orbiting scroll 50. It has a built-in automatic eccentricity adjustment mechanism that makes pressure contact. Reference numeral 69 denotes a rotation prevention mechanism of the orbiting scroll 50 called an Oldham ring, which prevents rotation while allowing the revolution of the orbiting scroll 50. 6
Reference numeral 4 is a bearing that supports the crankshaft 63, and 67 is a balance weight that balances the rotational mass.

The fixed scroll 30 in this scroll compressor is not fixed but is displaceably supported by the fixed scroll case 15 by actuators 711 to 734 which are drive supporting means. As shown in FIG. 2, the fixed scroll 30 has an actuator, which is a drive support means for supporting the fixed scroll 30.
Z in the axial direction, that is, in the z-axis direction from top to bottom
Axial actuators 731, 732, 733, 734
And x-axis direction actuators 711 and 712 that push the fixed scroll 30 from both sides in the x-axis direction perpendicular to the z-axis, z
It is provided with y-axis direction actuators 721 and 722 that push the fixed scroll 30 from both sides in the y-axis direction perpendicular to the axis and the x-axis. These actuators may use piezoelectric elements, hydraulic cylinders, pneumatic cylinders, or the like. In addition, control means (not shown) for controlling the operation of these actuators is provided, and this control means changes according to operating conditions such as orbiting speed of the orbiting scroll 50, pressure of working gas such as refrigerant, compression ratio, temperature and the like. The operation of each actuator is controlled so that the optimum scroll contact state can be obtained, and the position of the fixed scroll 30 is adjusted. Since the fixed scroll 30 is not fixed, the fixed scroll rotation preventing mechanism 79 and the fixed scroll seal 93 are provided between the fixed scroll 30 and the fixed scroll case 15. The fixed scroll rotation blocking mechanism 79 blocks the rotational movement of the fixed scroll 30 around the z-axis and allows other movements. Fixed scroll seal 9
Reference numeral 3 is for stopping gas leakage, and a rubber material or bellows having a large deformability may be used.

Next, the operation will be described. When the electric motor 62 is energized, the drive bush 65 eccentrically drives the orbiting scroll 50 via the crankshaft 63 and causes the orbiting scroll 50 to revolve. At that time, the Oldham ring 69 prevents the orbiting scroll 50 from rotating. When the orbiting scroll 50 revolves, the eccentric amount automatic adjustment mechanism of the drive bush 65 causes the orbiting outer part of the orbiting scroll wrap 54 to continuously contact the corresponding part of the fixed scroll wrap 34, and the orbiting scroll 50 and An enclosed space is formed between the fixed scroll 30 and this enclosed space,
With the revolution of the orbiting scroll 50, the volume is reduced while spirally moving toward the center. Therefore, the gas that enters the housing 11 through the suction pipe 12 and enters the scroll through the suction port (not shown) will not flow into the fixed scroll 30.
And the orbiting scroll 50 form a closed space, which is compressed while being orbitally moved toward the center, and is extruded from the ejection port 37 and discharged to the ejection pipe 13.

In this scroll compression operation, in order to form a closed space that spirally moves and compresses between the orbiting scroll 50 and the fixed scroll 30, an automatic eccentric amount of the drive bush 65 utilizing centrifugal force, elastic force, etc. is formed. By the adjusting mechanism, the orbiting outer part of the orbiting scroll wrap 54 is continuously brought into contact with the corresponding part of the fixed scroll wrap 34 at an appropriate contact pressure. In the axial direction, the orbiting scroll 50 is made by an elastic member or the like.
Is pressed against the fixed scroll 30.
However, since the optimum contact state changes depending on the operating conditions, conventionally, it has not always been operated in the optimum contact state.If the contact pressure is too large, friction loss and wear are large, and if the contact pressure is too small, There is a problem that vibration noise is generated when the leakage increases and the contact pressure fluctuates. On the other hand, in this scroll compressor, operating conditions such as the orbiting speed of the orbiting scroll 50, the pressure of working gas such as refrigerant, the compression ratio, and the temperature are detected to control the operations of the actuators 711 to 734. As a result, each of the actuators 711 to 734 drives the fixed scroll 30 and adjusts the position of the fixed scroll 30 so that the contact pressure between the fixed scroll 30 and the orbiting scroll 50 becomes optimum according to the operating conditions. As a result, friction loss and wear can be reduced, leakage can be reduced, and vibration noise can be reduced. Further, the actuator can be controlled by signals of gas pressure and temperature to prevent excessive pressure from being generated due to liquid compression, and to prevent damage due to interference at the inner end of the wrap when the gas is insufficient.

FIG. 3 is an example showing the characteristics of the actuator. The displacement increases as the signal voltage increases, but the operating force decreases as the displacement increases, and control is performed so that an appropriate pressing force is obtained. FIG. 4 shows the fluctuation of the pressing force of the lap during one cycle of the orbiting scroll 50. As shown by the solid line in the prior art, the pressing force changes as the gas suction, compression, and discharge conditions change. Although the fluctuation was large, the fluctuation can be reduced as shown by the broken line in the present proposal, and the generation of vibration noise is reduced.

In the above embodiment, the actuator is used to drive the fixed scroll 30 only in the linear motion in each of the x-axis, y-axis, and z-axis, but the z-axis direction actuators 731, 732, 733 are further considered. , 734 to control the rotational movement about the x-axis and the rotational movement about the y-axis,
The contact state between the fixed scroll 30 and the orbiting scroll 50 can be further improved by performing the movement of 5 degrees of freedom excluding the rotational movement around the z axis.

[0013]

As described above, according to the present invention, since the attitude of the fixed scroll is adjusted by the driving support means according to the operating conditions, the contact state between the fixed scroll and the orbiting scroll is improved, and friction loss, wear, and Problems such as leakage and vibration noise are eliminated.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a scroll compressor according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing drive support means for a fixed scroll of a scroll compressor according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of characteristics of drive support means of a fixed scroll of a scroll compressor according to an embodiment of the present invention.

FIG. 4 is a comparison diagram of pressing force with respect to a turning angle of a turning scroll.

FIG. 5 is a vertical cross-sectional view of a conventional scroll compressor.

[Explanation of symbols]

11: housing, 15: fixed scroll case, 30: fixed scroll, 34: fixed scroll wrap, 50: orbiting scroll, 54: orbiting scroll wrap, 65: drive bush, 69: Oldham ring, 711, 712: x-axis direction actuator , 721, 722: y-axis direction actuator, 731, 732, 733, 734: z-axis direction actuator, 79: fixed scroll rotation preventing mechanism, 93: fixed scroll seal.

Claims (1)

[Claims] 1. A scroll compressor for compressing gas by orbiting the orbiting scroll in a non-revolving orbit while contacting the fixed scroll with drive support means for movably supporting the fixed scroll in an axial direction and an axis-perpendicular direction. ,
A scroll compressor, wherein a signal indicating an operating condition of the scroll compressor is detected to control the drive support means to adjust the position of the fixed scroll.