The characteristics of several common vacuum pump, working principle and application scope

here are the characteristics of the vacuum pump, working principle and application scope.

1。 Screw pump

the characteristics of the screw pump: in addition to the common characteristics of positive displacement pump, screw pump can also be applied to many do not allow liquid mixing and rotating occasions, because it has axial flow continuity, uniform, small ripple, low speed of internal advantages and allows more air and other gas mixture. It is often used in petroleum, chemical industry, chemical fiber, power, offshore engineering, shipbuilding, precision machine tools, food and other industrial sectors.

2。 Gear pump

the characteristics of the gear pump:

( 1) Simple structure, low cost;

( 2) Job requires low, wide application;

( 3) Each end cover and gear tooth form multiple fixed seal cavity, can only be used as a quantitative pump;

( 4) Light weight, good in usability, low prices, strong self-priming capacity, is not sensitive to oil pollution, large speed range, resistance to shock loading, easy maintenance, reliable operation;

( 5) Unbalanced radial force, flow pulsation is big, big noise and low efficiency, poor parts interchangeability, difficult to repair after wear, cannot be used as variable pump. Scope:

general transportation lubricating liquid, such as fuel oil and lube oil sector; It in the machinery industry is used as the medium small force of the hydraulic system and the lubricating oil system of the auxiliary oil pump. It can be used to transport high viscosity materials, such as nylon, polyethylene, polypropylene and other molten resin in the chemical industry.

3。 Rotary vane vacuum pumps

rotary-vane vacuum pump are small volume, light weight, low noise. There is a gas ballast valve can remove a small amount of water vapor. In 5 to 40 degrees Celsius temperature range, the inlet pressure is less than 1. 3103 mpa, allowed to run continuously for a long time. When pumping gas relative humidity is more than 90%, should open the gas ballast valve. Equipped with automatic protection oil return valve, easy to start. Air inlet may not run smoothly for more than a minute. It is not suitable for removal of corrosive action on metals, react with pump oil and gas containing dust particles, and contains too much oxygen, explosive and toxic gas.

rotary vane pump is generally used in metallurgy, machinery, military industry, electronics, chemical industry, light industry, oil and medicine production and scientific research departments.

4。 Vane pump

vane pump features: output flow more uniform than gear pump, smooth operation, less noise. Working pressure is high, the volumetric efficiency is high. Single-acting vane pump is easy to realize the flow control. Double-acting vane pump service life is long, because the rotor radial hydraulic balance. However, vane pump self-priming ability is poor, is sensitive to oil pollution, the blade easily got stuck impurities, poor reliability. Complex structure, high manufacturing accuracy, high cost. The pump is usually used in medium viscosity of the liquid.