JP2002227784A - Vane rotary type gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vane rotary type gas compressor capable of preventing each vane from sticking by suction, enhancing the abrasion resistance and starting characteristics of a compressor, and suppressing the noise emission through a reduction of the frictional sliding sound of vanes. SOLUTION: Each vane 13 is equipped at the periphery with a plurality of dints 15 so that the vane 13 will not stick by suction to a vane groove 12 even in case the vane 13 and groove 12 are furnished with good flatness, surface roughness, etc., and gap(s) to allow the oil to pass is secured at all times between the vane 13 and groove 12, and the vane 12 can have good hopout performance, and it is possible to prevent the vane from wearing due to inferior lubricating workmanship.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane rotary type gas compressor used in a car air-conditioning system and the like, and more particularly, to a vane suction phenomenon and an improvement in abrasion resistance and startability of the compressor. At the same time, noise can be reduced by reducing the frictional sliding noise of the vane.

[0002]

2. Description of the Related Art As shown in FIGS. 1 and 2, for example, a vane rotary type gas compressor of this type has a rotor 8 rotatably mounted in a cylinder chamber 7 so as to be rotatable.
A plurality of vane grooves 12 are formed on the outer peripheral surface of the, and one vane 13 is slidably mounted in each of the vane grooves 12. A small chamber in the cylinder chamber 7 defined by the rotor 8 and the vane 13 is a compression chamber 14, and the compression chamber 14 is confined in the compression chamber 14 by repeatedly changing the volume by the rotation of the rotor 8. The compressed refrigerant is compressed.

In the meantime, in the case of the vane rotary type gas compressor as described above, the vane 13 and the vane groove 12 are provided with flatness and surface roughness for the purpose of enhancing wear durability due to sliding of the vane 13 and the like. It has been processed to improve the quality.

However, in the conventional vane rotary type gas compressor, when the flatness and the surface roughness of the vane 13 and the vane groove 12 are improved by the above-described processing, the vane 13 and the vane groove 12 come into contact with each other. sometimes,
Since the contact area is large and there is almost no gap between the vane 13 and the vane groove 12, the vane 13
Lubricating oil is difficult to be supplied between the vane 13 and the vane groove 12, and the vane 13
Not only deteriorates the abrasion resistance of the compressor, but also reduces the wear resistance of the compressor. In addition, the sticking phenomenon of the vane 13 causes the vane 13 to protrude poorly and the startability of the compressor to decrease. There was a problem.

In the conventional vane rotary type gas compressor, since the vane 13 slides in the vane groove 12, a noise problem that frictional sliding noise of the vane 13 is generated is caused by the structure. There is also.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to prevent the phenomenon of vane sticking, to reduce the wear resistance of the compressor, It is an object of the present invention to provide a vane rotary type gas compressor capable of improving startability and reducing noise by reducing frictional sliding noise of the vane.

[0007]

To achieve the above object, the present invention provides a rotor rotatably suspended in a cylinder chamber, a vane groove formed on an outer peripheral surface of the rotor,
The vane is slidably mounted in the vane groove, and comprises a small chamber in the cylinder chamber partitioned by the rotor and the vane. It is characterized by comprising a compression chamber for compressing, and a plurality of depressions formed on the outer peripheral surface of the vane.

The present invention is directed to a rotor rotatably mounted in a cylinder chamber, a vane groove formed on an outer peripheral surface of the rotor, a vane slidably mounted in the vane groove, and It consists of a small chamber in the cylinder chamber partitioned by vanes, and repeatedly changes the volume by the rotation of the rotor, and compresses the refrigerant by the change in volume, and a plurality of compression chambers formed on the side wall of the vane groove. And a concave portion.

[0009] The present invention is characterized in that the concave shape of the concave portion is a circular arc shape.

[0010] The present invention is characterized in that the number of the depressions provided is at least as many as necessary to prevent the phenomenon of vane sticking to the vane groove.

The present invention is characterized in that the depression is formed by pressing the vane on a plurality of steel balls and pressing the steel ball.

The present invention is characterized in that the depression is formed by shot peening.

The present invention is characterized in that the depression is formed by using a roll having a plurality of steel ball-shaped projections on its surface and pressing the vane with the roll. .

The present invention is characterized in that the depression is formed at least on a surface of the entire outer peripheral surface of the vane that partitions the compression chamber.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vane rotary type gas compressor according to the present invention will be described below in detail with reference to FIGS.

The basic structure of the vane rotary type gas compressor of the present embodiment is shown in FIGS. 2 and 3.
Explaining with reference to these figures, the vane rotary type gas compressor of the present embodiment has a structure in which a compression mechanism 2 is once housed in an open-type compressor case 1, and a front head is provided at an open end of the compressor case 1. 3 is attached.

The compression mechanism 2 has a cylinder 4 having a substantially elliptical inner circumference. Side blocks 5 and 6 are attached to both end faces of the cylinder 4, respectively, and the inner wall of the cylinder 4 and the cylinder facing the side blocks 5 and 6 are opposed to each other. The internal space of the cylinder 4 surrounded by the surface is provided as a cylinder chamber 7.

A cylindrical rotor 8 is horizontally mounted in the cylinder chamber 7, and the rotor 8 is interposed between a rotor shaft 9 provided integrally with the shaft center and bearings 10 and 11 of the side blocks 5 and 6. Supported rotatably.

The outer circumferential surface of the rotor 8 has vane grooves 12.
Are cut into five, and each vane groove 12 is slidably mounted one by one, and each vane 13 faces from the outer peripheral surface of the rotor 8 to the inner wall of the cylinder chamber 7. It is provided so that it can come and go freely.

The interior of the cylinder chamber 7 is partitioned into a plurality of small chambers by a rotor 8 and a vane 13, and each of the partitioned small chambers is a compression chamber 14. The refrigerant is compressed by the change in volume.

In the case of this embodiment, as shown in FIG.
A plurality of concave portions 15 having an arc shape are formed on the outer peripheral surface of each vane 13 as described above, which is different from the conventional one.

In this embodiment, the surfaces 13a and 13b of the entire outer peripheral surface of the vane 13 which partition the compression chamber 14 are formed.
Only the concave portion 15 having a circular arc shape is formed. This is because the surface is most likely to stick to the vane groove 12. Therefore, if the surface of the vane 13 that is easy to be sucked is determined, the above-described depression 15 may be provided on another surface that is easily sucked.

In the present embodiment, the concave shape of the concave portion 15 is formed to be an arc surface, so that the edge of the concave portion 15 is prevented from being edged, and the edge of the concave portion 15 does not damage the vane groove 12. Because he did. From such a viewpoint, basically, the structure of the depression 15 is preferably a structure having no edge at the edge. Comparing the concave portion having an arcuate surface shape having a large curvature with the concave portion having an arcuate surface shape having a small curvature, the edge formed at the edge of the concave portion 15 is not sharper in the former having the larger curvature, and thus the vane groove 12 From the viewpoint of preventing scratching, it is preferable to adopt an edge portion of an arc surface having a large curvature.

The concave portion 15 having the circular arc shape is inserted into the vane 13.
Means for forming a plurality on the outer peripheral surface of
A press forming method in which a plurality of small-diameter steel balls are scattered on a base, and a vane 13 is placed on these steel balls and press-formed,
A method of performing shot peening on the outer peripheral surface of the vane 13, or a pair of rolls 50, 5 having a plurality of steel ball-shaped convex portions 51, 51,.
There is a pressure forming method or the like in which the vanes 13 are pressed by the rolls 50 and 50 using such a method. In the case of this pressure forming method, when the vane 13 passes between a pair of rolls 50 and 50, The contours of the convex portions 51, 51,...
It is formed.

The vane 13 and the vane groove 12 are
In order to improve the flatness and the surface roughness of the vane 13 in view of the durability of the vane 13 due to the movement of the vane, when the vane 13 is subjected to this kind of finishing, the vane 1
There is a method in which the finishing process is performed before forming the recessed portion 15 on the outer peripheral surface of the substrate 3, and a method in which the finishing process is performed after the forming process of the recessed portion 15. Either one may be adopted.

Next, the operation of the gas compressor configured as described above will be described with reference to FIGS.

In the vane rotary type gas compressor of the present embodiment, when the volume of the compression chamber 14 changes due to the rotation of the rotor 8, when the volume increases, the low-pressure refrigerant gas in the suction chamber 16 is released from the cylinder 4 or the like. The air is sucked into the compression chamber 14 through the suction passage 17 of the first side and the suction ports 18 of the side blocks 5 and 6.

When the volume of the compression chamber 14 starts to decrease, the compression of the refrigerant gas in the compression chamber 14 starts due to the effect of the volume reduction. Thereafter, when the volume of the compression chamber 14 approaches the vicinity of the minimum, the pressure of the compressed high-pressure refrigerant gas causes
The reed valve 20 of the cylinder discharge hole 19 formed in the vicinity of the elliptical minor diameter portion of the cylinder 4 opens, whereby the high-pressure refrigerant gas in the compression chamber 14 is discharged from the cylinder discharge hole 19, the discharge chamber 21 in the cylinder outer space, and Oil separator 22
Through the discharge chamber 23 side. At this time, the oil contained in the high-pressure refrigerant gas is separated and captured by the oil separator 22, and is dropped and collected in the oil sump 24 at the bottom of the discharge chamber 23.

The oil collected in the oil sump 24 as described above is supplied to the side block 5 by the discharge pressure of the high-pressure refrigerant gas.
6 and the oil fed to the bearing clearance side of the rotor shaft 9 through the oil hole 25 of the cylinder 4, and further, the oil fed to the bearing clearance side is depressurized when passing through the bearing clearance, and the pressure of the side blocks 5 and 6 is reduced. It is supplied to the saliary groove 26 formed on the cylinder facing surface.

When the Sarai groove 26 and the bottom side of the vane groove 12 are in communication with each other, depressurized oil is supplied from the Sarai groove 26 to the bottom side of the vane groove 12, and its oil pressure (vane back pressure) and rotor Due to the centrifugal force 8, the vane 13 jumps out and is pressed against the inner wall of the cylinder chamber 7. At this time, a part of the decompressed oil at the bottom of the vane groove 12 tries to pass through the sliding clearance between the vane 13 and the vane groove 12 and tends to escape to the compression chamber 14 side. Is captured and held in the recess 15 on the outer peripheral surface of the vane 13.

However, like the vane rotary type gas compressor of the present embodiment, the recess 1 is formed on the outer peripheral surface of the vane 13.
Comparing the one in which a plurality of 5 are formed and the one in which the outer peripheral surface of the vane 13 is flat like a conventional vane rotary type gas compressor, the vane rotary type gas compressor of the present embodiment is better. Experiments have shown that the sticking phenomenon of the vanes 13 is less likely to occur, the vanes 13 fly out smoothly, and the startability of the compressor is improved. This is considered to be due to the lubricating action of the oil held in the recessed portion 15. Further, it has been found through experiments that the friction sliding noise of the vane 13 is smaller in the vane rotary type gas compressor of the present embodiment. It is considered that this is because the friction sliding noise of the vane 13 is diffused and reduced by the recess 15.

The shape, the number, the depth, the arrangement pattern and the like of the depressions 15 are not limited to those shown in the figures, and the effect of preventing the vane 13 from sticking and the effect of reducing frictional sliding noise can be obtained. Can be changed as needed.
For example, regarding the number of the recesses 15, the recesses 1
5 is provided at least as many as necessary to prevent the vane 13 from sticking to the vane groove 12, or
It is conceivable to provide as many as necessary to diffuse and reduce the frictional sliding noise of the vane 13.

In the above embodiment, a plurality of depressions 15 are formed on the outer peripheral surface of the vane 13. However, a plurality of depressions 15 of this type may be formed on the side wall of the vane groove 12. In this case, the same operation and effect as the above embodiment can be obtained.

[0034]

As described above, in the vane rotary type gas compressor according to the present invention, since a plurality of recesses are formed on the outer peripheral surface of the vane, the flatness and surface roughness of the vane and the vane groove are reduced. Even if it is favorable, the phenomenon of vane sticking to the vane groove does not occur, and a gap through which oil passes between the vane groove and the vane groove is always secured, so that the vane jumps out better. In addition, the vane can be prevented from being worn due to poor lubrication, so that the startability and wear resistance of the compressor can be improved.

Further, according to the vane rotary type gas compressor according to the present invention, since the friction sliding noise of the vane is diffused and reduced by the recess, the noise of the vane rotary type gas compressor can be reduced. And so on.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a main part of the present invention, in which (a) is an enlarged view around a vane and a vane groove, and (b).
FIG. 3A is a perspective view of the vane viewed from the arrow A side of FIG.

FIG. 2 is a sectional view of a vane rotary type gas compressor.

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

FIG. 4 is a perspective view showing an example of a method for forming a recess on the outer peripheral surface of the vane.

[Explanation of symbols]

 Reference Signs List 1 compressor case 2 compression mechanism 3 front head 4 cylinder 5, 6 side block 7 cylinder chamber 8 rotor 9 rotor shaft 10, 11 bearing 12 vane groove 13 vane 14 compression chamber 15 recess 16 suction chamber 17 suction passage 18 suction port 19 cylinder Discharge hole 20 Reed valve 21 Discharge chamber 22 Oil separator 23 Suction chamber 24 Oil reservoir 25 Oil hole 26 Sarai groove 50 Roll 51 Convex part

Claims (8)

[Claims] A rotor rotatably suspended in a cylinder chamber, a vane groove formed on an outer peripheral surface of the rotor, a vane slidably mounted in the vane groove, and the rotor and the vane. A compression chamber, which comprises a small chamber in the cylinder chamber formed as a partition, and which repeatedly changes the volume by the rotation of the rotor and compresses the refrigerant by the volume change, and a plurality of depressions formed on the outer peripheral surface of the vane. And a vane rotary type gas compressor. A rotor rotatably suspended in a cylinder chamber, a vane groove formed on an outer peripheral surface of the rotor, a vane slidably mounted in the vane groove, and the rotor and the vane. A compression chamber that is formed of a small chamber in the cylinder chamber formed by partitioning, and that repeatedly changes the volume by the rotation of the rotor and compresses the refrigerant by the change in the volume; and a plurality of depressions formed in a side wall of the vane groove. And a vane rotary type gas compressor. 3. The vane rotary type gas compressor according to claim 1, wherein the shape of the recess is an arc shape. 4. The vane rotary type according to claim 1, wherein the number of the depressions is provided by at least a number necessary to prevent a phenomenon of vane sticking to the vane groove. Gas compressor. 5. The vane rotary type gas compressor according to claim 1, wherein the depression is formed by pressing the vane on a plurality of steel balls and pressing the steel ball. 6. The vane rotary type gas compressor according to claim 1, wherein the depression is formed by shot peening. 7. The method according to claim 1, wherein the depression is formed by using a roll having a plurality of convex portions in the form of steel balls on its surface, and pressing the vane with the roll. Vane rotary type gas compressor. 8. The vane rotary type gas compressor according to claim 1, wherein the recess is formed on at least a surface of the entire outer peripheral surface of the vane that partitions the compression chamber. .