Vacuum Pumps Types

If a container is placed in natural environment, if the gas pressure inside the container is not changed, the gas pressure inside and outside the container reaches equilibrium state, which is equal to atmospheric pressure numerically. In order to achieve a vacuum inside the container, the gas inside the container must be discharged, so that the pressure of the gas inside the container is less than the pressure of the external atmosphere. Using mechanical, physical, chemical or physical chemical methods, the equipment that obtains the vacuum from the gas discharged from the container is called the vacuum pump. Vacuum pumps can be classified into compression type (varistor type) and adsorption type according to their working principles. The working principle of the compressed vacuum pump is to compress the gas at the inlet end of the pump to the outlet end and discharge it out of the pump.

Common compression vacuum pumps are: rotating mechanical pumps using expansion-compression-discharge process, turbomolecular pumps using turbine blades to remove the body, etc. The working principle of the adsorption vacuum pump is to adsorb the gas in the pump body, which has achieved the goal of reducing the gas pressure. Common adsorptive vacuum pumps are: ion pumps using ionization suction, adsorption pumps using physical or chemical adsorption, suction pumps and cryogenic condensation pumps. The biggest difference between the adsorption vacuum pump and the compression vacuum pump is that the adsorption vacuum pump does not discharge the gas out of the pump, but stores it in the pump. The vacuum degree of the former is higher than that of the latter, but the pumping speed is smaller and the suitable container is smaller. Vacuum resistance furnace uses compressed vacuum pumps, such as mechanical pumps, Roots vacuum pumps and diffusion pumps.

Various types of vacuum pumps have their own working scope. Some pumps can work directly from the atmospheric state, such as mechanical pumps and adsorption pumps. Some pumps can not work directly from the atmospheric state, such as diffusion vacuum pumps, molecular pumps, ion pumps and so on. Only when the inlet vacuum reaches a certain value can they start to work.

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2XZ-Series-Two-stage-High-Speed-Rotary-Vacuum-Pump

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