As a common device in laboratory, a vacuum pump is used to create or maintain the required vacuum level. It generally has a greatly wide application areas as a accessory equipment for other laboratory devices.
What is the Function of a Vacuum Pump?
A vacuum pump refers to a device or equipment that uses mechanical, physical, chemical or physical-chemical methods to evacuate the pumped container to obtain a vacuum. A vacuum pump is a device that uses various methods to improve, generate, and maintain a vacuum in a sealed space.
It can be used in pharmaceutical and chemical industries, vacuum coating, vacuum drying, surface treatment, vacuum smelting, brick, ceramic manufacturing, food packaging, milking, beverage industry and so on. The role of the vacuum pump is to remove gas molecules from the vacuum chamber, reduce the gas pressure in the vacuum chamber, and help to reach the required vacuum degree.
What are the Types of Vacuum Pumps?
Generally, there are four main types of vacuum pumps, concluded as follows:
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. The positive displacement vacuum pump is one of the most commonly used vacuum pumps, which includes the water circulating vacuum pumps, rotary vane vacuum pumps and diaphragm vacuum pumps.
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.
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 Vacuum Pump Work?
All vacuum pumps work in the same manner essentially. By making use of the pressure difference between two spaces, the majority of gas molecules or liquids are moved from one area to another area so that the former can obtain a lower pressure or vacuum condition.
Nowadays, 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.
Why does a Vacuum Pump Need Oil?
Vacuum pump oil is a kind of lubricating oil specially developed for vacuum pumps on vacuum equipment, which is divided into mineral oil and synthetic oil. Vacuum pump oil is suitable for reciprocating booster pumps, mechanical booster pumps and oil-sealed mechanical vacuum pumps. It can also be used for various diffusion vacuum pumps. It is recommended for vacuum pumps in the fields of crafts, ceramics, chemistry, etc.
Circulating water vacuum pump