Single stage rotary vane pump and double stage rotary vane pump
Rotary vane vacuum pump can be divided into single-stage and double-stage. Then, what are the differences between single-stage and double-stage? Let's get to know them together.
Rotary vane vacuum pump is a kind of varactor mechanical vacuum pump, which utilizes the rotating motion of the rotor and the vane sliding in the rotor slot to obtain vacuum. When the working fluid is used to lubricate and fill the dead gap of the pump chamber, separating the exhaust valve from the atmosphere, it is commonly known as the oil-sealed rotary vane vacuum pump. When there is no working fluid, it is a dry rotary vane vacuum pump. What is the difference between single-stage rotary vane pump and double-stage rotary vane pump?
In oil-sealed rotary vane vacuum pump, the belt-driven rotary vane vacuum pump is customarily called in China, while the direct-coupled rotary vane vacuum pump is directly connected with the motor or with the coupling. In each pump, there are single-stage and double-stage. In single-stage pumps, the limit pressure and usage of pumps are different due to the different structure and parameters.
Their common characteristics are simple structure, easy to use, starting from atmospheric pressure, directly discharging the atmosphere, less eccentric mass, simple maintenance, and improved pump structure to improve reliability.
In the aspect of pump structure, in order to prevent oil return when the pump stops, some have check valves that can automatically cut off the oil circuit, some have cut-off valves for the intake passage, and some have oil pumps and control structures that can automatically cut off the air circuit when the pump opening ballast suddenly shuts down to keep the pump mouth in the state of vacuum rotary vane vacuum pump. In terms of accessories, there are population filters, dust filters, steam condensation traps and chemical traps for mist eliminators, odor filters, blocking broken glass and other sundries. There are temperature control valves to control pump temperature to improve steam extraction rate and protect pump temperature control water volume. What is the difference between single-stage rotary vane pump and double-stage rotary vane pump?
Dual-stage rotary vane vacuum pump can be widely used in refrigerators, air conditioners, bulbs, fluorescent lamps, bottle gall production and electronics, metallurgy, medicine, chemical industry, oil filter, printing machinery, packaging machine and other industries. It can be used as the front-stage pump of diffusion pump, Roots pump, molecular pump, and other pumps. It can supply electronic instruments, medical instruments and other supporting and experimental research applications. Because direct pump has no dust pollution caused by belt friction, its volume is small, weight is light, material is saved, function is improved day by day, and it is more widely used.