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What is a Diaphragm Vacuum Pump?

A diaphragm vacuum pump is a type of positive displacement vacuum pump. It takes compressed air, electricity or liquid medium(such as oil) as the power source and utilizes the back-and-forth agitation of diaphragms in the cylinder to do work in order to transport a variety of mediums. It is mainly composed of the pump body shell, process medium inlet and outlet piping, air supply system, diaphragm and valve train.

Diaphragm vacuum pump

YH500 Diaphragm Vacuum Pump


Intrroduction to diaphragm vacuum pump

How does a Diaphragm Vacuum Pump Work?

When a diaphragm vacuum pump is working, the crank connecting rod mechanism drives the plunger to do reciprocating movement under the action of the motor. The movement of the plunger passes to the diaphragm through the working liquid(generally oil) in the cylinder so that the diaphragm agitate back and forth.

There is a diaphragm in the head part of the cylinder that can separate the transported liquid from the working liquid. When the diaphragm moves to one side of the transmission mechanism, the working chamber in the pump cylinder is negative pressure and thus the liquid is inhaled; when the diaphragm moves to another side, the liquid is discharged. The transported liquid is separated from the working liquid by the diaphragm in the pump cylinder, and only contacts with the pump cylinder, suction valve, discharge valve and inner side of the diaphragm without contacting the plunger and the sealing device. It makes important parts like the plunger can completely work in the oil medium and be in a good working state.

Applications of a Diaphragm Vacuum Pump

A diaphragm vacuum pump can be used in a great number of areas and even begin to play a leading role in paint spraying and ceramic industry. As a new type of transport machinery, a diaphragm vacuum pump is capable of transporting various corrosive liquids, liquids with particles, and high viscosity, volatile, flammable, highly toxic liquids. It is primarily made of four materials, including plastic, aluminum alloy, cast iron and stainless steel.

Types of Vacuum Pumps

There are mainly four types of vacuum pumps, concluded as follows:

  1. Positive Displacement Vacuum Pump: It mainly use volume change of the cavity to realize suction and exhaust so that the pressure can be increased and decreased.
  2. Diaphragm Vacuum Pump: It relies on a pair of mechanical diaphragm to move backwards and forwards so that the pressure can be increased and decreased.
  3. Entrapment Vacuum Pump: It is a refrigerated device that induces condensation of air molecules by cooling within a confined space. The resulting water is then removed.
  4. Momentum Transfer Vacuum Pump: It can be further classified into centrifugal and regenerative vacuum pumps. The former utilize a centrifuge to propel fluids through the device, while the latter recirculate fluids to increase the pressure.

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