JPS646355B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a so-called vane-type positive displacement rotary compressor in which a rotor is eccentrically arranged within a casing and vanes are supported by the rotor.
In particular, the present invention relates to a rotary compressor in which a cylindrical rotating sleeve is rotatably disposed within a casing, and vanes on a rotor rotate while contacting the inner surface of the rotating sleeve.

(Prior Art) In a vane-type rotary compressor, a structure in which a cylindrical rotating sleeve is rotatably disposed in a housing between the vane tip edge and the vane tip edge is known in order to reduce sliding wear on the vane tip edge. . Furthermore, in order to reduce the sliding between the rotating sleeve and the inner surface of the housing, for example, in Chapter 15 of "Displacement Compressors" published by Sangyo Tosho, there is a gap between the rotating sleeve and the housing. It is taught to provide a radial gap and introduce lubricating oil into this gap. However, this method has the disadvantage of causing power loss due to the drag resistance of the lubricating oil, and in the event of an oil leak, there is a risk that the leaked oil will mix with the discharged air, so the supercharging of the internal combustion engine It is unsuitable for use as a machine. Therefore, it is known that in this type of rotary compressor, an air bearing system is used between the rotary sleeve and the housing. However, with this support system, contact between the outer surface of the rotating sleeve and the inner surface of the housing occurs during startup, under high load, or under transient operating conditions. This contact causes surface abrasion or heat generation, which may cause seizure. especially,
This tendency is remarkable when this contact is a metal contact. Therefore, the surfaces of the metallic rotating sleeve and housing are coated with a wear-resistant and heat-resistant resin containing a solid lubricant, flaky aluminum, etc. to avoid metal contact. However, even with this method, the resin coating gradually wears out, and the abrasion powder enters the contact area between the rotating sleeve and the housing, promoting wear and increasing the frictional resistance of the contact area. This in turn induces seizure. In addition, in order to improve the air bearing function, long and narrow grooves are sometimes formed on the outer surface of the rotating sleeve to temporarily trap air, but abrasion particles can enter these grooves and reduce the air bearing function. If you do so, problems will occur.

(Objective of the present invention) The present invention aims to reduce the amount of wear and frictional resistance by removing wear particles from a rotary compressor.
It is an object of the present invention to provide a rotary compressor having a rotary sleeve that can prevent problems such as seizure.

(Configuration of the present invention) In order to achieve the above object, the present invention is configured as follows. That is, the rotary compressor of the present invention includes a casing having a center housing having a cylindrical inner circumferential surface and side housings arranged on both sides of the center housing, and a suction port and a discharge port formed in the side housing. a port, a rotary sleeve rotatably fitted into the center housing, a rotor eccentrically disposed within the sleeve, and a plurality of rotary sleeves fitted into the rotor so as to be retractable and slidably in contact with the inner circumferential surface of the rotary sleeve. The inner peripheral surface of the center housing is provided with a wear debris collection groove extending radially outward on the side where the circumferential suction port of the working chamber is located, and the casing is provided with a wear debris collection groove extending radially outward on the side where the circumferential suction port of the working chamber is located. a discharge passage having an open end opening on the side where the circumferential discharge port is located, extending in the circumferential direction and communicating with one end side of the wear debris collection groove; and one end communicating with the other end side of the wear debris collection groove. A wear powder discharge passage is formed, the other end of which is a discharge port communicating with the outside of the casing. In one preferred embodiment, the discharge passage opens into a dead space of the working chamber formed on the front side of the discharge port in the rotational direction of the rotor.

In the working chamber space where the rotor rotates, the pressure in the gap between the rotating sleeve and the center housing is not uniform, and the pressure on the circumferential suction port side is
It is lower than the pressure on the discharge port side. Therefore, abrasion powder generated when the rotating sleeve and the housing come into contact accumulates near the suction port. Moreover, the above-mentioned discharge passage opens near the discharge port where the pressure is high. There is thus an air flow leading from the working chamber through the discharge passage to the outside of the compressor. A wear debris collection groove that communicates with the above-mentioned exhaust passage is formed near the suction port of the casing, and the wear debris around the suction port that exists between the rotating sleeve and the center housing is collected by the above-mentioned air flow. and is ejected from the system.

(Effects of the present invention) According to the above configuration of the present invention, abrasion powder generated by friction between the rotating sleeve and the center housing is discharged to the outside of the rotary compressor via the discharge passage provided in the casing. Therefore, it is possible to prevent problems such as seizure caused by this abrasion powder remaining between the rotating sleeve and the center housing. This wear debris discharge structure opens one end of the discharge passage near the discharge port of the high-pressure working chamber to create an air flow within the discharge passage, and the wear debris is entrained in this air flow. is easy.

(Description of Embodiments) Referring to FIGS. 1 and 2, sectional views of a rotary compressor according to an embodiment of the present invention are shown.
The compressor C includes a cylindrical center housing 1 extending in the horizontal direction, and disk-shaped side housings 2 and 3 fixed to both ends of the center housing 1 by bolts 15. A working chamber 4 is formed inside by the center housing 1 and side housings 2 and 3, and a rotor 5 is disposed at an eccentric position of the working chamber 4. The shaft 5a of the rotor 5 is connected to the side housing 2,
Bearing mechanisms 2a and 3 respectively provided in 3
a, and is connected to a suitable power means (not shown), so that the rotor 5 can be rotated by the power from the power means. Four vanes 6 are fitted into the grooves 5b of the rotor 5 so as to be freely protrusive and retractable in the radial direction. A cylindrical rotating sleeve 7 is disposed between the rotor 5 and the center housing, and the tips of the vanes 6 rotate while being in contact with the inner surface of the rotating sleeve 7. A slight gap 8 is provided in the radial direction between the rotating sleeve 7 and the center housing 1, and due to the air bearing effect of the air present in this gap, the rotating sleeve 7 is spaced apart from the center housing 1. It is designed to rotate. The parts of the side housings 2 and 3 that correspond to the rotating sleeve 7 include
In addition to forming sliding contact portions 2b and 3b in which hard metal or the like is fitted, the side housing 3 is provided with an air intake port 9 and an air discharge port 10. The suction port 9 and the discharge port 10 open at positions facing each other in the circumferential direction of the working chamber 4 . On the inner surface of the center housing 1 near where the suction port 9 is located, collection grooves 12 are formed radially outward at intervals in the circumferential direction. The side housing 3 is provided with a discharge passage 13 that communicates with the collection groove 12 and extends in the circumferential direction. and,
One end of the discharge passage 13 opens through an opening 13a provided in the side housing 3 into the dead space of the working chamber 4 which exists in the front of the discharge port 10 in the rotor rotational direction, that is, on the leading side. The discharge passage 13 communicates the working chamber 4 with the outside of the compressor C by being connected to a through port (discharge port) 14 provided in the side housing 2 . The outer surface of the rotating sleeve 7 is coated with a heat-resistant and wear-resistant resin.

During operation of the compressor C, the rotating sleeve 7
The rotary sleeve 7 is eccentric inside the center housing 1, and the gap 8 between it and the center housing 1 is not constant, and the rotary sleeve 7 rotates close to the discharge port side. And when the engine starts,
Under certain conditions such as high loads and transient operating conditions, the air bearing becomes incomplete and the rotating sleeve 7 and center housing 1 come to rotate while being in contact with each other. As a result, the resin coating on the surface of the rotating sleeve 7 is worn away and abrasion powder is generated. This wear powder moves to the gap on the suction port 9 side where the pressure is relatively low and accumulates therein. If this wear powder is left unattended, it will gradually increase in size, and some of it will become interposed between the rotating sleeve 7 and the center housing 1, increasing frictional resistance and wear amount, as well as increasing the amount of heat generated, and eventually causing seizure. bring about

In this example, this abrasion powder is collected in the collection groove 12, and the abrasion powder collected in the collection groove 12 is discharged to the outside of the compressor through a discharge passage 13. In this case, the collecting groove 12
Since it is provided on the suction port side where the pressure is low, wear powder can be collected efficiently, and one end of the discharge passage 13 for discharging this wear powder is connected to the working chamber 4.
It opens into a dead space on the leading side of the discharge port 10, which has a relatively high pressure, and wear particles can be easily discharged from the system by a high-pressure air flow introduced through this opening.

FIG. 3 shows another embodiment of the invention, in which the collecting grooves 12 are relatively closely spaced compared to the previous embodiment. Also in this example,
The same effect as the previous example can be obtained.

Although the discharge passage 13 communicates with the outside through a through hole 14 provided in the side housing 2 in FIG. 2, the through hole 14 may be provided in the center housing 1.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a rotary compressor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along a plane including the rotor rotation axis of the rotary compressor of FIG. 1, and FIG. FIG. 2 is a diagram similar to FIG. 1 according to another embodiment of the invention; Explanation of symbols, C... Rotary compressor, 1... Center housing, 2, 3... Side housing, 4
... Working chamber, 12 ... Collection groove, 13 ... Discharge passage.

Claims (1)

[Scope of Claims] 1. A casing having a center housing having a cylindrical inner circumferential surface and side housings arranged at both ends of the center housing, an inlet port and a discharge port formed in the side housing, A rotating sleeve rotatably fitted into the center housing, a rotor eccentrically disposed within the sleeve, and a plurality of vanes fitted into the rotor so as to be retractable and sliding onto the inner circumferential surface of the rotating sleeve. In the rotary compressor, the inner peripheral surface of the center housing is provided with a wear debris collection groove extending radially outward on the side where the circumferential suction port of the working chamber is located, and the casing is provided with a wear debris collection groove extending radially outward on the side where the circumferential suction port of the working chamber is located. a discharge passage having an open end opening on the side where the circumferential discharge port is located, extending in the circumferential direction and communicating with one end side of the wear debris collection groove; and one end communicating with the other end side of the wear debris collection groove. What is claimed is: 1. A rotary compressor having a rotary sleeve, characterized in that a wear powder discharge passage is formed, the other end of which comprises a discharge port communicating with the outside of the casing. 2. A rotary compressor having a rotating sleeve according to claim 1, wherein the passage opens into a dead space in a working chamber formed on the front side of the discharge port in the rotor rotational direction.