JPS59188092A - Rotary compressor with rotating sleeve - Google Patents

Abstract

PURPOSE:To reduce the degree of sliding resistance, by making up a hard metallic layer on the inner circumferential surface of a housing and one side of the outer circumfereital surface of a rotating sleeve to be rotatably supported inside the housing, and also a wearproof resin layer on the other side respectively, while having a solid lubricant contained in both sides. CONSTITUTION:A displacement type rotary compressor houses a rotating sleeve 2 rotatably inside a cylindrical housing 1 and eccentrically sets up a rotor 3 in which plural vanes 5 are slidably set up in a radial direction inside the said sleeve 2. In this case, compressed air is led into space between the rotating sleeve 2 and the housing 1 via plural through holes 9 formed in the rotating sleeve 2 whereby a pneumatic bearing is formed up. And, a hard metallic layer, for example, a nitriding layer is formed on an inner circumferntial surface 1a of the housing 1 and one side of an outer circumferential surface of the rotating sleeve 2, while each of wearproof resin layers of epoxy resin, polyimide resin, or the like is formed on the other side. In addition, layers of a solid lubricant are laminatedly formed on at least either of these two layers.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positive displacement rotary compressor in which a rotor is eccentrically arranged within a housing and vanes are supported by the rotor. In particular, the present invention relates to a rotary compressor in which a cylindrical rotary sleeve is rotatably disposed within a housing, and a base 7 on the rotor is in sliding contact with the inner surface of the rotary sleeve.

(Prior Art) A positive displacement rotary compressor in which a rotor supporting vanes is eccentrically arranged within a housing has long been known as a vane type compressor or a vane type compressor. In this type of compressor, the edges of the vanes come into sliding contact with the inner circumferential surface of the housing, so wear and seizure of the edges of the vanes and the inner circumferential surface of the housing become a problem. Therefore, in the past, attempts have been made to reduce the wear and seizure problems by making various improvements to the materials or surface finishes of the inner circumferential surface of the housing and the vanes, but no fully satisfactory solution has been found. Not yet.

In a vane type rotary compressor, a structure is also known in which sliding of the vane tip edge is reduced.

For example, in Japanese Utility Model Publication No. 24-73667, a sleeve-shaped outer rotor is rotatably disposed within a fixed I housing having a cylindrical inner peripheral surface, and a vane-shaped supporting inner rotor is provided inside the outer rotor. A rotary compressor is shown in which the rotor is arranged eccentrically so that it comes into pressure contact with the inner peripheral surface of the outer rotor, which is the edge of the vane.

In addition, in Japanese Patent Publication No. 23322, a vane-type rotary compressor with a sleeve-shaped outer rotor is improved by attaching side plates to both ends of the rotating cylinder corresponding to the outer rotor. A structure is shown that solves the problem of sliding between the vane side end and the inner rotor side surface and the inner surface of the nozzle by configuring the rotary nozzle. In a rotary compressor with such a structure, the sliding movement at the tip of the vane can be greatly reduced, but since sliding occurs between the outer rotor or rotating nozzing and the stationary nozzing. , lubrication of this sliding surface becomes a problem. m
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@5iii - Waku 11th story ■Tame Bose Kai 悶岨閤国朞 It is also possible to introduce compressed air between the sleeve-shaped outer rotor and the fixed housing to support the outer rotor by an air bearing. For example, it is taught in Chapter 7j of "Displacement Type Compressors" published by Sangyo Zuso, section on movable vane rotary compressors. However, the usual lubrication method, in which lubricating oil is sealed between the inner surface of the fixed housing and the outer surface of the outer rotor, has the disadvantage that the drag resistance of the lubricating oil causes power loss, and it also causes problems in the event of an oil leak. for,
Since there is a risk that the leaked oil will be mixed into the discharged air, this rotary pressure m machine cannot be used as a supercharger for an internal combustion engine. With commonly used ferrous materials and aluminum alloys, the sliding resistance between the stationary housing and the outer rotor is high, resulting in seizure. Further, although the sliding surface can be improved by soft nitriding or anodizing, this problem cannot be solved satisfactorily.

(Object of the Invention) The present invention provides a rotary compressor having an outer rotor or a rotary sleeve whose edges are pressed against the inner circumferential surface and which are arranged in a housing so as to rotate as the vanes rotate. An object of the present invention is to reduce as much as possible problems associated with sliding between a rotating sleeve and a housing.

(Structure of the Invention) The present invention includes a housing having a cylindrical inner circumferential surface, a rotating sleeve rotatably disposed within the housing, a rotor eccentrically disposed within the rotating sleeve, and a housing supported by the rotor. In a positive displacement rotary compressor, the vane is in sliding contact with the inner circumferential surface of the rotary sleeve, and means for introducing compressed air between the housing and the rotary sleeve is provided. A hard metal layer is provided on one side of the outer circumferential surface of the rotating sleeve and an inner circumferential surface of the sleeve, and a wear-resistant resin layer is provided on the other side. A solid lubricant is included in at least one of the metallic layer and the resin layer.

As a hard metallic layer, hard chrome plating or NIP plating may be applied to the base of the sliding surface. In this case, the plating surface is made into a porous structure by a known method such as applying a reverse polarity voltage during the plating process. A large number of recesses formed on the surface may be filled with a solid lubricant. 1. If the sliding surface base is made of iron-based material, the above-mentioned hard metallic layer may be constituted by a nitrided layer formed by soft nitriding. When soft nitriding is performed, bulges occur in the base material at the grain boundaries between the base matrix and graphite, so light lapping is then applied to remove the bulges that are prone to chipping.
A solid lubricant may be filled into a large number of recesses formed on the surface. If the base material is an aluminum alloy, the sliding surface can be anodized to form an anodized film, and the solid lubricant can be filled in the recesses of about 700 microns that normally form on the surface of this film. .

Solid lubricants include molybdenum disulfide, boron nitride,
A carbon-based lubricant such as graphite or non-industrial resin powder can be used, and this solid lubricant is mixed with a bonding material such as epoxy resin, fluororesin, polyide resin, or grease, and an appropriate solvent is required. Depending on the situation, it can be applied by spraying, etc., hardened by pressing with a roll, etc., and then heated and baked.

As the wear-resistant resin, epoxy resin, polyimide resin, etc. can be used, and it is preferable to include flaky aluminum in a proportion of about 20 parts by volume based on the resin/θO capacity. In order to form this resin layer on the sliding surface, it is sufficient to apply the resin onto the sliding surface by a conventional method and heat and harden it.

Moreover, in order to include a solid lubricant in this resin j~, it is sufficient to mix the solid lubricant in a dispersed state with the resin before applying the resin. In this case, the mixing ratio is preferably 10 to 2θ volume parts of the lubricant to the resin/θ0 volume volume. If the amount of lubricant is less than 70 parts by volume, insufficient lubrication will result in increased driving torque and increased wear of the resin coating, and if the amount of lubricant is more than 20 parts by volume, the resin will The holding power of the lubricant becomes weaker, causing the lubricant to fall off, resulting in insufficient lubrication and increased wear of the coating.

(Effects of the Invention) In the present invention, compressed air is introduced between the rotating sleeve and the housing, and the rotating sleeve is supported by an air bearing, so the sliding resistance is greater than when lubricating oil is used. It can be reduced to width. In addition, a hard metal layer is formed on one of the inner peripheral surface of the housing and the outer peripheral surface of the rotating sleeve, and a wear-resistant resin layer is formed on the other, and at least one of the metal layer and the resin layer is provided with solid lubricant. Since it contains the agent, the driving resistance of the rotating sleeve can be greatly reduced, and wear and seizure of the sliding surface can be prevented.

(Description of Examples) Compressor Structure FIG. 1 is a cross-sectional view showing an example of a rotary compressor to which the present invention is applied.
It consists of a housing 1 having a diameter of 1, a cylindrical rotating sleeve 2 rotatably disposed within the housing 1, and a rotor 3 eccentrically disposed within the rotating sleeve 2. The rotor 3 has t radial slits 4 arranged in a cross shape, and a vane 5 is arranged in each slit 4 so as to be slidable in the radial direction. Although not shown in the figure, the rotor 3 has a drive shaft, and is driven in the direction of the arrow by an appropriate power source via this drive shaft. The vanes 5 rotate as the rotor 3 rotates, and their tips are pressed against the inner circumferential surface of the rotating sleeve 2 by centrifugal force.

Side plates 6 are attached to both sides of the housing 1, and a suction boat 7 and a discharge boat 7 are attached to one or both side plates 6. - 8 is formed. Through holes 9 are formed in the rotating sleeve 2 in the radial direction at appropriate intervals in the circumferential direction, and compressed air is introduced between the rotating sleeve 2 and the housing 1 through the through holes 9 to form an air bearing. . As mentioned above, rotor 3
As the vane 75 rotates, the vane 75 also rotates, and the vane 5 is pressed against the inner circumferential surface of the rotating sleeve 2 by centrifugal force. Therefore, a frictional force is generated between the vane 75 and the rotating sleeve 2, and the rotating sleeve 2 receives a rotational force from the vane 5 corresponding to this frictional force and rotates.

Since compressed air is introduced between the housing 1 and the rotating sleeve to form an air bearing, the resistance to rotation of the rotating sleeve 2 is extremely small, and the sleeve 2 rotates at a speed approximately corresponding to the rotational speed of the vane 5. can do.

As described above, even if the rotating sleeve 2 is supported by an air bearing, contact between the rotating sleeve 2 and the housing 1 cannot be completely prevented. Therefore, the inner peripheral surface 1 of the housing 1
a and the outer peripheral surface of the rotating housing 2 are subjected to special surface treatment.

A hard metallic layer is formed on one of the sliding surfaces.

If the base of the sliding surface is an iron-based material, the hard metallic layer can be formed by soft nitriding. In this case, it is preferable to roughen the surface using a shot plus knife or the like prior to the nitrocarburizing treatment. Figure 2 shows the state near the surface after soft-nitriding treatment. As shown in the figure, the surface of the base material 100 has Fn
A nitrided layer 11 made of a -C-A ternary compound is formed, and this nitrided layer 11 has protrusions 11a raised at grain boundaries with graphite 12 contained in the base material. After performing a light lapping treatment on the surface having this nitride layer 11 to remove the brittle portion of the protrusion 11a that is easily chipped, the third
As shown in the figure, a coating 14 containing a solid lubricant is formed.

The film is formed, for example, by applying a mixture of polygon resin and a solid lubricant to the surface. After coating, the resin is cured by heating or after being pressed with a roller. In the case of epoxy resin, heating is 0 to 2! ; It is preferable to carry out QC for about 1 minute of 3θ.

If the base of the sliding surface is made of an aluminum alloy, the surface is anodized to form an anodized film, and solid lubricant is applied in the same manner as described above.

Further, the hard metal layer may be formed by hard chromium plating or NIP plating. At this time, the plating layer may be formed into a porous structure using a well-known method, and the recesses formed on the surface thereof may be filled with a solid lubricant using the same method as described above.

A wear-resistant resin is formed on the other sliding surface.

As the resin, epoxy resin, polyamide resin, etc. may be used, and a normal method can be used to form the resin layer. It is preferable that about 20 parts by volume of flaky aluminum be mixed into the resin for every 7 parts by volume of 10θ. When a solid lubricant is included in the resin layer, the lubricant may be mixed with the resin before the resin is applied. The amount of lubricant is
Preferably, the volume is 10 to 2θ/2θ per 100 parts by volume of the resin.

Example A rotary compressor having the structure shown in FIG. 1 and a working volume tθ0α was prepared, a wear-resistant resin layer was formed on the rotary sleeve, and a hard metal layer was formed on the housing, and the compressor was operated at a speed of 3000 rpm for S hours. , wear amount and driving torque were measured. Table 1 shows the sliding surface treatment conditions and test results.

As shown in Table 1 and above, both the coating and the I/Using exhibit superior wear resistance in the Examples of the present invention, compared to the case of using the untreated aluminum alloy U/Using as a comparative example. A similar test was conducted using a similar compressor with a hard metal layer formed on the rotating sleeve and a wear-resistant resin layer formed on the sleeve. The results are shown in Table 2.

[Brief explanation of the drawing]

FIG. 7 is a cross-sectional view showing an example of a rotary compressor to which the present invention can be applied, and FIGS. 2 and 3 are enlarged cross-sectional views showing a nitrided layer when soft nitriding is used to form a hard metal layer. be. 1...Housing 2...Rotating sleeve 3...Rotor 5...Vane patent applicant Toyo Kogyo Co., Ltd. Procedures Amendment Book Showa 1999, Month, Date Patent Director-General Wakasugi Kazuo 1, case description Showa J♂ Patent Application No. AO720 2
, Title of the invention Rotary compressor 3 with rotating sleeve
, Relationship with the case of the person making the amendment Applicant 4, Agent 7, Subject of amendment Column 8 for detailed explanation of the invention in the specification
Contents of amendment 1 The statements in the description are corrected as shown in the table below. No 1 Gu≠! ! 0 Yu, Table 2 on page 1 of the specification has been revised as follows.

Claims (1)

[Claims] (1) A housing having a cylindrical inner peripheral surface, a rotating sleeve rotatably disposed within the housing, a rotor eccentrically disposed within the rotating sleeve, and an inner periphery of the rotating sleeve supported by the rotor. In a positive displacement rotary compressor comprising a vane in sliding contact with a surface, means is provided for introducing compressed air between the rotary sleeve in the housing and the rotary sleeve is supported by an air bearing. A hard metallic layer is formed on one of the outer circumferential surface of the rotating sleeve and the inner circumferential surface of the housing, and a wear-resistant resin layer is formed on the other, and at least one of the metallic layer and the resin layer is formed. A rotary compressor characterized by containing a solid lubricant.