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The circulating water vacuum pumps, including the table type and vertical type, are provided at their best price.

What is a vacuum pump?

A vacuum pump can be defined as a device to remove air or gas molecular from a sealed container in order to create a vacuum. It plays an essential role in many fields, such as pharmaceutical and chemical industries, food packaging, vacuum drying and other fields. A vacuum pump is always used in the beginning of a process result from that a vacuum condition is usually necessary for the whole process and prepares for next operations.

Introduction to Vacuum Pump

Working Principles of Vacuum Pumps

There are three kinds of working principles of vacuum pumps, including mechanical, physical and chemical ways. It is often required that more than two vacuum pumps should cooperate with each other in order to reach certain vacuum pumps.

Classifications 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.

How does a Water Circulating Vacuum Pump Work?

As a type of positive displacement pumps, a water circulating vacuum pump takes advantage of volume change of the cavity to realize suction and exhaust.

Specifically speaking, an appropriate amount of water is put into the pump as the working liquid, which will be thrown around by rotating impellers. Because of centrifugal force, the water forms a closed ring of approximately equal thickness depending on the shape of the pump chamber. The inner surface of the lower part of the water ring is just tangent to the hub of the impeller, while the inner surface of the upper part of the water ring is just tangent to the tip. (Actually, the blades have a certain insertion depth in the water ring.) At this time, a crescent space is formed between the impeller hub and the water ring, which is divided into several small cavities equal to the number of blades by the impeller.

If the lower part of the impeller is taken as the starting point, the area of small cavity will change from small to large and be connected with the suction port on the end face when the impeller is rotated first 180 degrees. At this time, gas is drawn in, and the cavity is isolated from the suction port when the suction ends. The small cavity area will change from large to small and compress gas when the impeller continuously rotates. The gas is discharged out of the pump when the small cavity is connected with the outlet.

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