vacuum pump / liquid ring vacuum pump

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A positive displacement compressor

The vacuum pumps and compressors are rotary positive displacement pumps that cover a wide range of applications. The applications are in chemical, petrochemical, pharmaceutical, paint industries as well as general industries.

The internals of the fluid ring vacuum pump or compressor are partially filled with fluid in operation. Casing and port plates form the internals, where the eccentrically mounted rotating impeller forms a fluid ring. The fluid ring forms a cell between the impeller blades, that expands during rotation and thus draws the gas through the suction port. As the impeller rotates further, these cells are getting smaller and consequently compressing the gas through the discharge port. Together with the gas, a part of the fluid will be expelled through the discharge port that is separated from the gas in the separator.

By means of a flexible discharge port in the port plate, the fluid ring vacuum pump operates with maximum efficiency in the whole range of suction pressure. The port opening adapts to the actual compression ratio, so that overcompression will be avoided.

vacuum pump

Range of applications of a vacuum pump

The major application of liquid ring vacuum pumps and compressors is in the handling of wet gas and vapours that will condense partially during compression. Because compression is near isothermal, these machines are specifically suitable for the handling of explosive or polymerising gases or vapours.

Characteristics of a vacuum pump

Fluid ring vacuum pumps are positive displacement compressors, which are equipped with single or double suction impellers, according to size. Fluid ring vacuum pumps do not need lubricants; there are no parts in direct contact inside the hydraulics. Therefore these pumps feature low noise operation as well as simple and robust design.

Benefits of a vacuum pump

All sizes of the LVP range can be equipped with various methods of shaft sealing. Available are single mechanical seals and double mechanical seals as well as hermetically sealed magnetic couplings and canned motors. In hermetically sealed pumps, the shaft seal is replaced  by a magnetic coupling or a canned motor. Therefore wear at seals is eliminated. The permanent magnetic coupling or canned motor transmits the torque between driver and pump through the containment shell and thus eliminates the shaft seal.

Delivery characteristics of a vacuum pump

Capacity [Q]: max. 3000 m³/h
Discharge pressure [mbar (abs)]: max. 2500
Pressure Rating: PN 10
Temperature: -20°C to +100°C

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