Diaphragm type vacuum pump

Abstract

The diaphragm type vacuum pump comprises a pump body, a pump cover is installed at the upper end of the pump body through a bolt, and a bearing box is installed at the lower end of the pump body through a bolt; the pump shaft is rotationally arranged in the pump body, the driving mechanism is installed on the bearing box, a small diaphragm is installed on the pump shaft, a pump cavity is formed above the small diaphragm, the partition plate is arranged in the pump cavity and connected with the upper end of the pump shaft, and a large diaphragm is connected between the periphery of the partition plate and the inner wall of the pump cavity; an air inlet is formed in the pump cover, a first one-way valve is installed on the air inlet, a via hole is formed in the partition plate, a second one-way valve is installed on the via hole, an exhaust hole is formed in the pump body, and a third one-way valve is installed on the exhaust hole. No mechanical friction exists in the working process, so that the mechanical heating phenomenon of a vacuum part does not exist, external cooling and internal oil lubrication are not needed, the complete environment-friendly and oil-free effects can be achieved, continuous working for more than 8000 hours can be basically achieved, and accessories do not need to be replaced.

Description

technical field [0001] The invention relates to the technical field of vacuum pumps, in particular to a diaphragm type vacuum pump. Background technique [0002] Most vacuum pumps on the market use liquid ring, screw, and vane structures. Whether it is liquid ring type, screw type or sliding vane vacuum pump structure, they all have certain defects. [0003] The liquid ring vacuum pump needs to circulate water or oil for liquid sealing during operation, so as to achieve vacuum. Therefore, this type of product has low efficiency, and the vacuum degree is greatly affected by the vapor pressure of the sealing liquid; at the same time, it will pollute the environment; [0004] The screw vacuum pump is divided into oil-run and oil-free, and the oil-run also pollutes the environment; whether it is oil-free or oil-run, the screw vacuum pump generates a huge amount of heat, so it needs external water for cooling. ; [0005] Sliding vane vacuum pumps are also oil-lubricated, and ...

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