JPS6148556A - Vane - Google Patents

Abstract

PURPOSE:To obtain a vane having improved wear and seizing resistances by using an Al-Si alloy contg. a specified amount of ceramic powder having a specified particle size. CONSTITUTION:Each vane of a vane type rotary compressor is set in a slit cut in the rotor so that it goes freely in and out, and in accordance with the rotation of the rotor, the tip of the vane slides along the inside of a cam ring for holding the rotor. The vane is made of an Al-Si alloy contg. 2-7wt% ceramic powder having 5-50mum particle size and 1,000-2,000 hardness Hv.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vane used in a vane type rotary compressor or a Hoehn type pump.

(Prior art) A rotary machine equipped with vanes, such as a vane type rotary compressor,
A rotor (rotating body) attached to the shaft is rotatably housed in a cam ring, and inside this rotor, there are multiple back pressure passages filled with medium pressure lubricating oil in the axial direction and at the bottom. A plurality of radially extending slits that communicate with each back pressure passage and open on the outer peripheral surface of the rotor are provided, and a vane is slidably housed in each of the slits. Each of these vanes is applied radial outward back pressure by lubricating oil supplied into the back pressure passage, and as the rotor rotates, the tips of the vanes move while sliding against the inner peripheral surface of the cam ring. However, a pump chamber that expands and contracts is defined by adjacent vanes between the cam ring and the rotor.

(Problems to be Solved by the Invention) However, in the conventional fin, the cam ring is made of cast iron, while the fin is made of silicon.
Since it was formed from an aluminum silicon Aβ-3i alloy consisting of primary crystal silicon containing 0 to 20% and having a particle size of 1 to 10Qpm, there was a problem in that it lacked wear resistance and seizure resistance. In other words, aluminum silicon Aβ-Si
In the production of alloys, primary silicon contains everything from small particles that are not a problem to coarse particles that can cause wear.Because the particle sizes are uneven and the hardness of the coarse particles themselves is low,
Coarse particles on the tip of the vane that slides on the inner peripheral surface of the cam ring peel off, which generates abrasion powder that accelerates wear and seizure on the back of the vane that slides into contact with the vane tip and slit.
This had the disadvantage of reducing the durability of the vane.

(Purpose of the Invention) Therefore, the present invention provides a vane that suppresses peeling of particles by reducing the particle size and making them uniform and increasing the hardness of the particles, thereby improving wear resistance, seizure resistance, and durability. The purpose is to

(Means for solving the problem) In order to solve the above problem, the vane of the present invention contains 2 to 7% by weight of ceramic powder having a particle size of 5 to 50 pm.
Contaminated aluminum silico!
It is made of a metal alloy.

(Example) An embodiment of the present invention will be described below.

In this embodiment, a case where the present invention is applied to a vane used in a Hoehne rotary compressor will be described.

As shown in Figure 1, the vane type rotary compressor is
A rotor (rotating body) 2 is pivotally attached to the cam ring 1, and the rotor 2 is rotatably housed in a cam ring 3. A plurality of back pressure passages 4 are formed in the rotor 2 in its axial direction,
A plurality of slits 5 are provided in the radial direction, each of which has a bottom communicating with the back pressure passage 4 and which opens at the outer peripheral surface of the rotor. Further, vanes 6 are slidably housed in each of these slits 5, and each of these vanes 6 is connected to the back pressure passage 4.
Hoehn back pressure is applied radially outward by medium-pressure lubricating oil supplied inside. Therefore, as the rotor 2 rotates, the tips of the vanes 6 touch the inner peripheral surface of the cam ring 3. A pump chamber 7 that expands and contracts is defined by vanes 6 adjacent to each other between the cam ring 3 and the rotor 2.

The vane of this embodiment includes the rotor 3 and the cam ring 2.
is made of cast iron, while the vane 6 has a thickness of 5 to 50 μm.
It is made of an aluminum silicon alloy mixed with 2 to 7% by weight of a ceramic fluid having a uniform particle size and a hardness of Hv 1000 to 2000. In this example, silicon carbide SiC is used as the ceramic powder.
Or silicon nitride 5i3N-4 powder
Using particles formed to a uniform particle size of 50 μm, this was
The vane 6 was formed by mixing ~7% by weight.

In such vanes, the particle size is smaller and can be manufactured uniformly than in the past, so there is no mixing of coarse particles as in the past, and the variation in the particles is small and the hardness of the particles themselves increases, making them more difficult to manufacture than in the past. It can prevent coarse particles from peeling off.

The test results conducted by the present inventors are shown in FIG. Figure 2 shows the wear scar width versus sliding speed of the vane tip in a pin-drum type wear test, where curve a is the curve when the vane is made of a conventional Aβ-Si alloy, curve c is the curve when the vane is made of a conventional Aβ-Si alloy, 1 shows the case of SiC addition and the case of Si3N'4 addition according to the present invention, respectively. Note that the conditions are that the lubricating oil is at 80° C., the supply rate is 300 mβ/min, the Hoene load is 3 kg/m rd, and the cam ring is made of gray cast iron. As you can understand from this graph,
Compared to the case where the vane is made of conventional Aβ-Si alloy,
When a vane is formed by adding SiC or Si3N4 according to the present invention, the width of the wear scar becomes significantly smaller and becomes uniform with respect to the sliding speed. Since the wear of the vanes can be reduced in this way, it is possible to improve the wear resistance and seizure resistance of the vane tip that slides on the inner peripheral surface of the cam ring and the vane back that slides on the rotor slit, thereby improving the vane's durability. Furthermore, as the wear resistance improves, the high-temperature strength of the vane tip, which is exposed to high temperatures, increases, making it possible to apply it to high-load, high-speed operations.

(Effects of the Invention) As explained above, according to the present invention, the particles of the material forming the vane are made fine and uniform, which increases the hardness of the particles themselves and increases the durability of the tip of the sliding vane. Abrasion resistance can be improved. As a result, it is possible to improve the wear resistance and seizure resistance of the sliding contact parts of the vane, such as the vane tip and back surface, which improves the durability of the vane and makes it suitable for high-load and high-speed operation. It became.

[Brief explanation of the drawing]

Figures 1 and 2 relate to one embodiment of the present invention, with Figure 1 being a cross-sectional view of a vane-type rotary compressor, and Figure 2 being a graph showing the relationship between vane sliding speed and wear scar width. be. 2----1 rotor (rotating body), 3-1~---cam ring, 5-------slit, 6-------vane. Figure 1

Claims (1)

[Claims] A vane that is retractably housed in a slit formed in a rotating body, and whose tip slides along the inner circumferential surface of a cam ring that accommodates the rotating body as the rotating body rotates. 2 to 7 ceramic powders with a diameter of 5 to 50 μm
A vane characterized by being formed from an aluminum-silicon alloy mixed with % by weight.