JPS6146486A - Vane type rotary compressor - Google Patents

Abstract

PURPOSE:To prevent breakage of oil film and abrasion at sliding section by forming the vane surface contactable with the sliding face of slit and the innercircumferential face of cam ring with predetermined coarseness then making many oil sump holes deeper than said coarseness in said surface. CONSTITUTION:The uppermost surface of the leading end section 16a and the sliding face 16c of vane 16 contacting with another member is formed with the surface coarseness lower than 0.1muRa. Furthermore, many oil sump holes 20 deeper than the surface coarseness are made in said surface with the maximum depth of at least 1mu for example. Since the lubricant can be temporarily stored in said holes 20, it can be fed quickly even upon mutual pressing of the sliding faces with strong force thus to prevent breakage of oil. Consequently, abrasion at the cam ring, rotor and vane 16 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vane-type rotary compressor, for example, a vane-type rotary compressor that compresses gas such as refrigerant gas used in an air-conditioning device.

(Prior Art) Conventional vane type rotary compressors of this type include, for example, the technology shown in FIGS.
-106582) is known. Figure 2 shows the cam ring 1 and rotor 2 of a conventional vane type rotary compressor.
This shows the surrounding area of . The cam ring 1 is shown in Figure 2 (a
As shown in FIG. 1, the inner periphery is formed into a cylindrical body with a substantially elliptical cross section, and the shape of the inner periphery is composed of a small diameter portion and a large diameter portion. Both ends of the cam ring 1 are closed by a front plate 3 and a rear plate 4, as shown in FIG. 3.4 via bearings 5a and 5b so as to be rotatable. That is, the rotating shaft 2a of the rotor 2 is supported by both plates 3.4 via needle bearings 5a, 5b. Further, the rotor 2 is provided with a plurality of slits 2b formed substantially in the radial direction at intervals in the circumferential direction. Surin)
2b is opened radially outward of the rotor 2, closed radially inward partway, and opened at both end faces in the axial direction.

A rectangular plate-shaped vane 6 as shown in FIG. The back side 6b of the vane 6 is housed in the closing side of the slot 7) 2b, and the back side 6b of the vane 6 protrudes outward from the radius of the rotor 2.
The back pressure of the lubricating oil filled on the closing side of the slit 2b is acting on the slit 2b. The vane 6 slides within the ring 1-2b as the rotor 2 rotates, and due to the centrifugal force and the back pressure, the tip of the vane 6 always slides against the inner circumferential surface of the cam ring 1, so that there is a gap between the cam ring 1 and the rotor 2. A pump chamber 7 is defined. This pump chamber 7 acts as a suction chamber or a compression chamber as the rotor 2 rotates. Conventionally, the vane 6 is, for example,
The Al-3t alloy is heat-treated and finished by grinding and barrel polishing, and its hardness is HRB 70~
90 (Rockwell B scale), the surface roughness as shown in FIG. 3 (bl) is 0.2 to 086 μRα (average roughness).

(Problems to be Solved by the Invention) However, in any conventional vane, back pressure (7 to 15 kg/c+a) and centrifugal Since the tip 6a of the vane 6 is always strongly pressed against the inner circumferential surface of the cam ring 1 by the force F, an oil film breaks down between the cam ring 1 and the vane 6, increasing friction, and the inner circumferential surface of the cam ring 1 Also, there is a risk that the tip portion 6a of the vane 6 will be significantly worn. In addition, since the vane 6 slides in and out of the slit 2b while receiving a reaction force in the direction opposite to the rotation direction, the surface opposite to the rotation direction of the vane 6 has a large contact with the sliding surface 2C of the slit 2b. The rotor 2 and the vane 6 are pressed by force and come into sliding contact, and as expected, an oil film breaks down between the rotor 2 and the vane 6, increasing friction, and the surface 6C opposite to the rotational direction of the vane 6 and the sliding surface of the slit 2b in contact with that surface. There was a problem in that there was a risk that 2C would be significantly worn. Therefore, in this fl, the surface of the vane 6 that contacts at least the sliding surface 2C of the slit 2b and the inner peripheral surface of the cam ring 1 is formed with a predetermined roughness, and the surface of the vane 6 is formed with the predetermined roughness. The purpose is to prevent wear on the cam ring 1, rotor 2, and vane 6 by forming a large number of oil sump holes with a larger depth in a scattered manner.

(Means for Solving the Problems) In order to achieve such an object, the present invention is provided with a slit that is slidably fitted into a slit formed in a substantially radial direction in a rotor, and whose tip portion is adapted to rotate as the rotor rotates. In a vane-type rotary compressor having vanes that are always in sliding contact with the inner circumferential surface of a cam ring that accommodates a rotor, the surface of the vane that is in contact with at least the sliding surface of the slit and the inner circumferential surface of the cam ring is roughened to a predetermined roughness. The surface roughness is formed with a large number of oil sump holes having a depth greater than the roughness described above.

(Function) The present invention having such a configuration can temporarily store lubricating oil in the many oil sump holes formed on the surface of the vane, so that when the oil film is about to run out, the oil can be quickly removed from the oil film. It is possible to prevent the oil film from running out by supplying it to the parts.

(Example) Hereinafter, the present invention will be explained based on examples.

FIG. 1 is a diagram showing a vane of a vane type rotary compressor according to an embodiment of the present invention. The other configurations are the same as those of the conventional vane type rotary compressor and will therefore be omitted.

In FIG. 1(a), 16 is a vane that is slidably fitted into a slit 2b formed in the rotor 2 in a substantially radial direction, and 16a is a vane that fits into the inner peripheral surface of the cam ring 1 as the rotor 2 rotates. The tip is always in sliding contact, and 16b is the slit 2.
16C is a sliding surface that slides on the sliding surface 2C of the slot 2b of the rotor 2.

As shown in FIG. 1 (bl), the surfaces of the tip portion 16a and the sliding surface 16c of the vane 16 are formed with a surface roughness (predetermined roughness) of 0.1 μRa or less on the outermost surface that contacts the mating member. Further, a large number of oil sump holes 20 having a depth greater than this roughness, for example, a maximum depth of at least 1 μm, are scattered and formed on such a surface. As a possible solution, the following treatment may be applied to the vane after heat treatment and grinding.

(a) P type (granular) or N type (wedge shape)
First, the deep oil sump hole 20 is formed using a rough barrel using S type media (grindstone), and then a surface with a roughness of 0.1 μRa or less is formed using a finishing barrel using S type (granular) media. do.

(b) The deep oil sump hole 20 is first formed by lapping with alumina abrasive grains with a grain size of around 20 μm, and then boring is performed with alumina abrasive grains with a grain size of around 0.3 μm. This forms a surface with a roughness of 0°1 μRa or less.

(c) The deep oil sump hole 20 is formed by shot blasting using alumina abrasive grains with a grain size of around 20μ.
is formed, and then polished using alumina abrasive grains having a grain size of approximately 0.3 μm to form a surface with a roughness of 0.1 μRa or less.

(d) The deep oil sump hole 20 is formed by electrolytic polishing, and then a surface with a roughness of 0.1 μRa or less is formed by boring with alumina abrasive grains having a particle size of around 0.3 μ. do.

(E) The deep oil sump hole 2 is made by etching corrosion processing.
0 is formed, and then a surface with a roughness of 0.1 μRa or less is formed by performing a boring process using alumina abrasive grains having a particle size of approximately 0.3 μRa.

When the vane 16 according to this embodiment is used in a vane-type rotary compressor, lubricating oil can be temporarily stored in the oil reservoir holes 20 formed in large numbers scattered on the surface of the vane 16, so that the cam ring 1 The inner peripheral surface of the vane 16 and the tip 16a of the vane 16
, or even if the sliding surface 2C of the slit 2b of the rotor 2 and the sliding surface 16c of the vane 16 are pressed against each other with a strong force and an oil film is about to run out, the oil in the oil sump hole 20 will quickly form an oil film. This can prevent the oil film from running out. This prevents an increase in friction between the inner peripheral surface of the cam ring 1, the tip 16a of the vane 16, and the sliding surface 16C1, or the sliding surface 16c of the vane 16 due to the reaction force when the rotor rotates twice. It is possible to effectively prevent wear on the sliding surface 2c of the sliding rotor 2.

In the embodiment described above, a large number of oil sump holes 20 are provided at least in the tip portion 16a and the sliding surface 16c of the vane 16.
It is sufficient to provide vane 1, but depending on the method of formation, vane 1
Oil sump holes 20 may be provided on the entire surface of 6.

(Effects of the Invention) As described above, according to the present invention, by preventing the oil film from running out on each sliding portion, it is possible to prevent wear on the cam ring, rotor, and vane.

[Brief explanation of the drawing]

FIG. 1(a) is a perspective view of a vane of a vane-type rotary compressor according to an embodiment of the present invention, and FIG. 1(bl is an enlarged sectional view showing the state of the surface of the vane shown in FIG. 1(a). , FIG. 2 shows the cam ring and rotor surroundings of a conventional vane-type rotary compressor, and FIG.
Figure (b) is its cross-sectional side view, Figure 3 shows the vane applied to the vane type rotary compressor shown in Figure 2, and Figure 3 (a) shows the vane applied to the vane type rotary compressor shown in Figure 2.
1 is a perspective view thereof, and FIG. 3(b) is an enlarged sectional view showing the roughness of the surface. 1-----One cam ring, 2-------One rotor, 2b-----Slit, 2cm----One sliding surface, 16-------Vane, 16 a---- -One tip, 16cm--Sliding surface, 20--Oil sump hole.

Claims (1)

[Claims] A vane that is slidably fitted into a slit formed in a substantially radial direction in the rotor, and whose tip always slides into contact with the inner circumferential surface of a cam ring that houses the rotor as the rotor rotates. In the vane type rotary compressor, at least the surface of the vane that contacts the sliding surface of the slit and the inner circumferential surface of the cam ring is formed with a predetermined roughness, and the surface is provided with a surface having a depth greater than the roughness. A vane-type rotary compressor characterized by a large number of oil sump holes formed in a scattered manner.