How Does Vacuum Pump Work?
Vacuum pump is a kind of equipment that evacuates the pumped container to obtain a vacuum by means of mechanical, physics, chemistry or physical Chemistry methods. The gas is absorbed in from the air inlet and enters the cavity of the frontline pump through the ventilation/isolation valve. In the pump, the gas is conveyed. When the inlet is closed by the blade, the gas is conveyed and compressed. During the transferring process, the oil is transferred from the oil injection port and inhaled into the cylinder.
On one hand, the oil plays a role of sealing and lubricating between the cylinder wall and the end surface of the blade, on the other hand, it also plays a role of sealing and lubricating the blade in the rotor. When the gas is absorbed into the secondary pump from the stent channel, the gas is transferred and compressed like the frontline pump (which means, the volume is converted and compressed), and discharged into the exhaust channel through the exhaust valve and then discharged to the atmosphere in the end. The entrained oil in the gas will be collected by the filter. For instance, cars use hydraulic brake, while the trucks or buses use steam power brake. In this case, vacuum pump is used for generating subatmospheric pressure, then increasing braking force. The vacuum pumps of automobile generators are generally oil pumps, which means the vacuum pump core and the shaft of the generator rotate together. Through continuously inhaling and pumping oil, the vacuum pump generates subatmospheric pressure inside the pump. Generally speaking, a vacuum pump is a device that uses various methods to improve, generate and maintain vacuum in a certain enclosed space.
The working principle of various vacuum pump, first of all, the vacuum pump is rotated to pump the system to 10-2 Pa till the diffusion pump oil is heated and boiled, then the high-speed oil vapor flow continuously brings the gas molecules inside the system gather at the side arm elbow of the pump bulbs, and they will be pumped out when the gas density reaches the working range of the mechanical vacuum pump, thereby gradually obtaining a high vacuum.
According to the working principle of vacuum pumps, vacuum pumps can basically be divided into two types: Gas capture pumps and gas transmission pumps. The vacuum pump can be used alone or as a pre-pump for booster pump, diffusion pump, frontline of molecular pump, maintenance pump, and titanium pump. It can be used to make electric vacuum container, vacuum welding, printing, blister, refrigeration equipment maintenance and instrumentation equipment and laboratory, etc. In addition, it is widely used on food, research, medical, electronics, chemical, pharmaceutical, universities and colleges and other fields. Due to the wide range of working pressures involved in the vacuum application department, none of any type vacuum pump can completely adapt to all the working pressure range. For using convenience and the demands of each vacuum process, sometimes various vacuum pumps are combined according to their performance requirements and used in unit type.