JP2007224725A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve an operation sound after stopping over a long time, in a vane rotary type compressor. <P>SOLUTION: In the vane rotary type compressor, since a difference between a vane length and a vane slot length can be restricted small by selecting a combination of the length of a vane slot 3 and the length of a vane 4, an effect capable of improving a problem of deteriorating the operation sound can be provided when stating the compressor again after stopping the compressor over a long time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a compressor that compresses a fluid, and particularly to a compressor that is used in an air conditioner for automobiles.

Conventionally, in this type of so-called vane rotary type compressor, a substantially columnar rotor is disposed in a cylinder having a cylindrical inner wall, and a part of the outer periphery of the rotor has a small gap from the inner wall of the cylinder. It is arranged at the position to form. The rotor is provided with a plurality of vane slots, and vanes are slidably inserted into the vane slots. The rotor is formed integrally with a drive shaft that is rotatably supported. The cylinder and the rotor are sandwiched between the front side plate and the rear side plate in the rotation axis direction of the rotor, and both ends of the cylinder are closed by these to form a working chamber for fluid compression in the cylinder. In such compressors, the vane slot and vane length settings are designed so that the vane is completely within the vane slot, even when the respective component dimensional tolerances are taken into account. (For example, refer to Patent Document 1).
JP 2005-2826 A

  However, in the above-described conventional configuration, the vane slot and vane length setting are designed so that the vane is completely within the vane slot, even when the respective component dimensional tolerances are taken into account. Therefore, when the vane is accommodated in the vane slot, the difference between the vane length and the vane slot length is about 1 mm. When the compressor is stopped for a long time, the vane Moves to the rear end of the vane slot by its own weight, and when the compressor is started again, the difference between the vane length and the vane slot length is about 1 mm. This increases the collision speed of the compressor and deteriorates the operating noise when starting the compressor.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a compressor capable of improving the operating noise of the compressor even when the compressor is restarted after being stopped for a long time. And

  In order to solve the above-mentioned conventional problems, the compressor of the present invention is characterized in that a combination of vane slot length and vane length dimension is selected. In this way, the length of the vane slot and the length of the vane are measured, and it is natural that each dimension is within the design tolerance. By dividing the section into sections and combining the section with the vane slot length and the section with the vane length, the vane length and vane slot length of the assembled compressor can be adjusted. The difference can be limited to be obviously smaller than the difference when it is incorporated unintentionally (hereinafter, this method is referred to as matching).

  With the matched combination, a gap of about 1 mm can usually be reduced to about 0.1 mm or less, and when the compressor is stopped for a long time, the vane has its own weight and the rear end of the vane slot. When the compressor is started again, the collision speed to the cylinder increases by the difference between the vane length and the vane slot length. It becomes possible to make it smaller than at the time of dimension setting, and the effect of improving the problem that the operating noise at the time of starting the compressor is deteriorated can be obtained.

  The compressor of the present invention makes it possible to improve the compressor operating sound in the case of restarting after a long stop by matching the vane slot length and vane length. Can do.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a compressor to which a part of the present invention is applied, FIG. 2 is a sectional view taken along the line AA (working chamber sectional view) in FIG. 1, and FIG. FIG. 2 shows the case where the rotor stops at a different angle.

  The compressor shown in the figure is a so-called vane rotary type compressor, and as shown in the drawing, a substantially columnar rotor 2 is arranged in a cylinder 1 having a cylindrical inner wall. The rotor 2 is disposed at a position where a part of the outer periphery forms a minute gap with the inner wall of the cylinder 1. The rotor 2 is provided with a plurality of vane slots 3, and vanes 4 are slidably inserted into the vane slots 3. The rotor 2 is formed integrally with a drive shaft 5 that is rotatably supported. The cylinder 1 and the rotor 2 are sandwiched between the front side plate 6 and the rear side plate 7 in the rotational axis direction of the rotor 2, and both ends of the cylinder 1 are closed by these, and a working chamber 8 for fluid compression is formed in the cylinder. Is formed.

  A suction hole 9 and a discharge hole 10 communicate with the working chamber 8, and a gas fluid such as refrigerant gas is sucked into the working chamber 8 from the suction hole 9 and compressed, and then discharged from the discharge hole 10. A discharge valve 11 made of, for example, a reed valve is disposed at the outlet of the discharge hole 10.

  Lubricating oil is supplied from the oil storage chamber 52 via the oil supply passage 18 that supplies the lubricating oil to the compression mechanism, and the lubricating oil stored in the oil storage chamber via the vane back pressure adjusting device 16 is supplied to the oil supply passage 18. Supplied. The vane back pressure adjusting device 16 controls the oil supply pressure and the amount of oil supplied to the compression mechanism according to the refrigerant gas pressure around the compression mechanism.

  Hereinafter, the operation of the compressor according to the above-described embodiment will be described.

  When the drive shaft 5 and the rotor 2 are rotated in the clockwise direction in FIG. 2 upon receiving power transmission from a drive source such as an in-vehicle engine, the vanes in the vane slots are accompanied by centrifugal force generated by the rotation. Due to the pressure of the lubricating oil supplied from the vane back pressure adjusting device, the vane slides along the inner wall of the cylinder as the rotor rotates, and is surrounded by the vane, the rotor and the cylinder. The space changes its volume with the rotation of the rotor and vanes, and functions to compress the refrigerant. Further, when the air conditioner switch is turned off, the power transmission from the drive source such as the in-vehicle engine is cut off, and the rotation of the drive shaft 5 and the rotor 2 is stopped. Further, when the air conditioner switch is turned on, the rotation of the rotor is resumed, and the above-described rotor and vane movements are repeated.

By the way, when the air conditioner switch is OFF for a long time and the air conditioner is operated again after that, the compressor is stopped again for a long time, and then the rotation of the rotor is resumed. The movement in the compressor in such a case will be described. Immediately after the compressor is stopped, the vane is caused by the lubricating oil supplied from the vane back pressure adjusting device to the vane back as shown in FIG. The pressure is maintained, and all the vanes remain along the inner wall of the cylinder, and the tip of the vane is in contact with the inner wall of the cylinder. However, if the compressor is stopped for a long time, the lubricating oil on the back of the vane leaks through the gap between the vane and the vane slit and the pressure on the back of the vane does not continue to be maintained. The vane of C in No. 2 moves to the rear end portion inside the vane slot due to its own weight.

  When the compressor is started again, the vane is removed from the rear end of the vane slot by the centrifugal force generated by the rotation of the rotor and the lubricating oil supplied from the vane back pressure adjusting device. After receiving a force in the direction of separation and colliding with the inner wall of the cylinder, the vane rotates with the rotation of the rotor, and the vane tip is always in the cylinder due to the centrifugal force and the pressure generated by the lubricant on the back of the vane. It slides along the inner wall.

  Here, the vane receives a force in a direction away from the rear end portion of the vane slot by the first rotation, and collides with the inner wall of the cylinder to generate a sound due to the collision. Although this collision sound is generated for a short time, it generates an alien sound.

  The present invention is characterized in that the length of the vane slot and the length of the vane are matched, and the dimension of X in FIG. 5 is usually about 1 mm. By adjusting the vane slot length to 0.1 mm or less, the level of the extraneous sound that the vane collides with the cylinder inner wall can be maintained even when the compressor is restarted after the compressor has been stopped for a long time. It can be reduced and improved.

  That is, by matching the length of the vane and the vane slot and reducing the dimension X in FIG. 5, even when the vane is held by its own weight up to the rear end of the vane slot, the conventional compression is performed. Since the dimensions are smaller than the machine, the gap between the vane tip and the cylinder is smaller than the conventional compressor. Therefore, when the compressor is restarted after being stopped for a long time, the speed at which the vane collides with the inner wall of the cylinder is reduced by the small size of X, and as a result, the tip of the vane becomes the inner wall of the cylinder. The sound generated at the time of collision with the engine is reduced, and the operation sound at the time of starting the compressor is improved.

  As described above, in the compressor according to the present invention, high lubricating oil separation efficiency can be exhibited at a wide range of compressor rotation speeds, and further, the reliability of the compressor at high speed rotation can be ensured. It can be applied to other uses.

The longitudinal cross-sectional view of the compressor which shows embodiment to which a part of this invention was applied AA sectional view of FIG. 1 (working chamber sectional view) AA sectional view of FIG. 1 (when the rotor stop position is different from FIG. 2) AA sectional view when the example of the present invention is applied to the compressor shown in FIG. D section enlarged view of FIG.

Explanation of symbols

1 shilling 2 ro overnight 3 vane slot 4 vane

Claims (1)

A substantially columnar rotor is disposed in a cylinder having a cylindrical inner wall, and a part of the outer periphery thereof is disposed at a position that forms a minute gap with the inner wall of the cylinder. The rotor has a plurality of vane slots. A combination of vane slot length and vane length dimension was selected for a vane rotary type compressor provided with vanes slidably inserted into each vane slot. Compressor characterized by.

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