Anti-oil back streaming structure of vacuum pump

Abstract

The invention discloses a rotary-vane vacuum pump and provides an anti-oil back streaming structure of the vacuum pump. The anti-oil back streaming structure is an ingenious idea and avoids pumping oil entering into the pump chamber and vacuum system when the vacuum pump shouts down, thereby solving the technical problems that the pumping oil enters into the pump chamber after the vacuum pump shuts down which leads to difficult start of the vacuum pump and damage of related parts in severe cases, and the pumping oil enters into the vacuum system in cases of failures of the anti-oil back streaming valve, and the like in the prior art. The anti-oil back streaming structure comprises a pump stator and a pump rear cover, wherein a pump rotor is eccentrically arranged in the pump chamber bounded by the pump stator and the pump rear cover, an oil storage tank is arranged on the pump rear cover, the upper shield of the oil storage tank is provided with an elastic valve block, a pumping oil outlet channel and a pumping oil introduction channel are arranged in the pump rear cover, one end of the pumping oil outlet channel is communicated with one end of the pumping oil introduction channel in the oil storage tank, the other end of the pumping oil outlet channel is connected with the oil pump, the other end of the pumping oil introduction channel is communicated with the end surface of the pump rotor corresponding to the pump rear cover, and a vent is arranged on a passage conducting air between the end surface of the pump rotor and the oil pump.

Description

technical field [0001] The invention relates to a rotary vane vacuum pump, in particular to an anti-oil return structure of the vacuum pump which can effectively prevent the vacuum pump oil from entering the pump cavity and the vacuum system when the vacuum pump is shut down. Background technique [0002] Vacuum pump is a device that generates, improves and maintains vacuum in a closed space by means of mechanical, physical, chemical or physical chemistry. It is widely used in the fields of medicine, chemical industry, electronic technology, vacuum drying, refrigeration, etc. Type vacuum pumps, rotary vacuum pumps and molecular pumps, etc. Among them, rotary vacuum pumps are the most widely used as primary pumps, but rotary vacuum pumps usually have the following problems, that is, when the vacuum system is in the process of vacuuming or after stopping vacuuming, due to The vacuum system is under negative pressure. After the vacuum pump oil enters the pump cavity, the oil wi...

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Problems solved by technology

[0004] The present invention mainly provides an anti-return oil structure of a vacuum pump with reasonable structure and ingenious concept, which can effectively prevent the vacuum pump oil from entering the pump cavity and the vacuum system when the vacuum pump is abnormally shut down, and solves the problem of the vacuum pump in the prior art. After shutdown, the vacuum pump oil will enter the pump cavity under the action of negative pressure, resulting in large exhaust resistance when the vacuum pump is started, especially at low temperature, which will cause the vacuum pump to fail to start or difficult to start, and even cause the rotary vane, pump, etc. The damage of the rotor and other parts, the failure of the vacuum pump, and the technical problems of the vacuum pump oil entering the vacuum system when the anti-backflow valve fails

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