Rotary Vane Vacuum Pump

Abstract

The invention discloses a rotary-vane vacuum pump. The rotary-vane vacuum pump comprises an oil tank, a pump body, a first pumping part, a second pumping part and a driving part, wherein the pump body is arranged on the side of the oil tank and provided with a cavity inside; the first pumping part is arranged inside the pump body; the second pumping part is arranged outside the pump body; an air inlet is formed in the upper portion of the pump body; an air outlet is formed in the end of one side of the pump body; the cavity is communicated with the air inlet so as to form an air inlet channel; the cavity is communicated with the air outlet so as to form an air outlet channel; the first pumping part is a rotor which is arranged in the cavity and axially connected with rotary vanes which are movable in the radial direction; the ends of the rotary vanes make contact with the inner wall of the cavity of the pump body; an oil inlet pipe is arranged at the top of the oil tank; the end of the oil inlet pipe is connected with an oil cover through screw threads; an oil outlet is formed in the side of the oil tank; a position, which corresponds to the oil outlet of the oil tank, of the side wall of the pump body is provided with an oil inlet. The rotary-vane vacuum pump is simple in structure and easy and convenient to operate; the vacuum pumping speed and the working efficiency are high by the aid of the two pumping parts; uniform temperature in the pump body is guaranteed by means of an oil return pipeline and a refrigeration part.

Description

technical field [0001] The invention belongs to the technical field of vacuum pumps, in particular to a rotary vane vacuum pump. Background technique [0002] A vacuum pump refers to a device or device that uses mechanical, physical, chemical or physicochemical methods to evacuate the evacuated container to obtain a vacuum. Vacuum pumps are widely used in cryogenic equipment, pharmaceutical and chemical industries, food machinery, industrial electric furnaces, and electronics industries. Vacuum pumps can be divided into rough vacuum, high vacuum, and ultra-high vacuum according to the vacuum degree. For high vacuum pumps, they can be divided into slide valve vacuum pumps, rotary vane vacuum pumps, and Roots vacuum pumps according to their working principles. Among them, the rotary vane vacuum pump mainly moves along the radial direction of the rotor through the rotor in the cavity of the pump body and a plurality of rotary vanes on the rotor, and contacts with the inner wal...

AI Technical Summary

Problems solved by technology

However, such a setting makes the oil in the cavity of the pump body easy to enter into the parts that need to be vacuumed due to the pressure when the rotary vane vacuum pump fails and stops, causing pollution to the parts

During the rotation of the rotary vane, the friction between the rotary vane and the inner wall of the cavity will generate heat, which will increase the temperature of the oil in the cavity. The pump body in the prior art usually does not have an oil return device. Oil cannot pass refrigeration

Of course, the temperature in the cavity can be lowered by draining the heated oil and re-injecting new oil, but this method consumes a lot of oil, wastes resources, and is very expensive

And usually there are more rotating parts in the pump body, and the noise is louder

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