JPH02125991A - Vane type hydraulic machine without publication - Google Patents

Abstract

PURPOSE:To improve yield strength against bending stress of a vane and prevent the vane from break-down or the like by forming the vane of carbon powder and a binding material while using in the vane composite material having carbon fibers oriented radially and axially. CONSTITUTION:A vane 40 is movably inserted in a groove on a rotor for example so that the tip 41 is slidably pressed against the inside surface of a cylinder as the rotor is rotated. In this case, the vane 40 is formed of carbon powder and a binding material, and has carbon fibers 42R, 42A oriented and mixed in the radial direction R and axial direction A respectively to form a composite material. Thus, the yield strength against bending stress of the vane 40 is improved to prevent the even thinned vane 40 from break-down. Thus, a vane type hydraulic machine can be obtained which has a long life even in a single stage without lubrication.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention deals with gas as a handling fluid, connects a fluid load to the suction side and/or the discharge side, and applies it to the region of a compressor where the pressure ratio exceeds 2. The present invention relates to a non-lubricated vane-type fluid machine, which is a vane-type blower that extends over the entire range, and in which there is no lubricating oil in the cylinder and the vanes self-lubricate.

[Conventional technology]

FIG. 2 is a principle diagram of a well-known general vane type fluid machine, in which an eccentric rotor 2 is placed inside a cylinder 1.
A multi-striped groove 3 is provided in the rotor 2 in the axial direction, and a radially movable vane 4 is inserted into the groove 3. When the rotor 2 rotates, the vanes 4 are pressed against the inner surface of the cylinder 1 by centrifugal force and slide, and the volume of the space 5 between the cylinder 1 and the rotor 2 surrounded by the vanes 4 changes, from the suction side 6 to the discharge side. Gas is pumped to 7.

Some cylinders inject lubricating oil into the cylinder 1 to lubricate the sliding parts of the vanes 4, but conventional ones used in devices that apply tension to magnetic tape in computers, food packaging machines, printing machines, etc. Vanes made of carbon powder hardened with resin are used as a self-lubricating material.

[Problem to be solved by the invention]

In the conventional technology described above, centrifugal force acts on the non-lubricated vanes in the radial direction, and gas pressure and sliding friction force act in the circumferential direction, which causes wear of the vanes and has a relatively short lifespan, e.g. There is a problem in that it needs to be replaced every ~3000 hours.

The centrifugal force can be reduced by making the vanes thinner, but the bending stress in the circumferential direction increases, which can lead to breakage during startup and shutdown, and when the strength of the vanes is no longer able to withstand the force,
The problem often arises that it is necessary to reduce the pressure applied to each table and adopt a two-stage type.

An object of the present invention is to provide a non-lubricated vane-type fluid machine with a long vane life even in a single stage.

[Means to solve the problem]

This invention provides an eccentric rotor inside the cylinder,
In a non-lubricated vane-type fluid machine in which multiple grooves are provided in the axial direction on the rotor and vanes movable in the radial direction are inserted into the grooves, the vanes are made of carbon powder and a binder, and are made of carbon fibers. This is a non-lubricated vane-type fluid machine made of a composite material with radially and axially oriented.

[Effect]

Carbon fiber is a fibrous material obtained by processing polyacrylonitrile fiber, for example, and has high strength and elastic modulus, especially the elastic modulus is 3 to 5 times that of glass fiber, and has a low coefficient of friction and excellent wear resistance. Since such carbon fibers are oriented so that the direction of the fibers is in the radial direction and axial direction of the vane,
The vane's resistance to bending stress has increased dramatically,
Even if the vane is thin, it will not break.

〔Example〕

FIG. 1 is a perspective view of the vane of the embodiment, which is used in the vane of FIG.

In Figure 1, the tip 4 sliding against the inner surface of the cylinder
The vane 40 with 1 is made of carbon powder and a binder, into which carbon fibers 42 (42R, 42A) oriented in the radial direction R and the axial direction A are mixed to form a composite material. .

As an example, the conventional vane had a thickness of 5 mm, but the carbon fiber composite material vane 40 has a thickness of 2 N and a life span of more than 2.5 times. In addition to monofilament, the carbon fibers may be thread-like, cotton-like, cloth-like, or short fibers. Note that when it is necessary to make the inner surface of the cylinder 1 higher in hardness than the vane 40, the hardness of the carbon fiber lining, which is suitably fine ceramic lining or zirconia thermal spraying, may be controlled. Further, in order to expect only bending strength without expecting wear resistance, it is also easy to mix carbon fiber in the entire vane 40 except for the tip 41.

〔Effect of the invention〕

This invention provides an eccentric rotor inside the cylinder,
In a non-lubricated vane-type fluid machine in which multiple grooves are provided in the axial direction on the rotor and vanes movable in the radial direction are inserted into the grooves, the vanes are made of carbon powder and a binder, and are made of carbon fibers. Since the vane is made of a composite material that is oriented in the radial and axial directions, the friction coefficient of the vane is kept low, the wear resistance is good, the life is extended, and the strength against bending stress is increased. This has the effect that even if the vane is made thinner by increasing the thickness, it will not break.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment, and FIG. 2 is a principle diagram of a general vane-type fluid machine. 1... Cylinder, 2... Rotor, 4°40... Vane, 42R1 42A... Carbon fiber.

Claims (1)

[Claims] 1) A non-lubricated vane type in which an eccentric rotor is provided inside the cylinder, multiple grooves are provided in the axial direction, and vanes movable in the radial direction are inserted into the grooves. A non-lubricated vane type fluid machine, characterized in that the vane is made of a composite material made of carbon powder and a binder, and carbon fibers are oriented in the radial direction and the axial direction.