In the oil seal rotary vane vacuum pump, it is customary to refer to the belt drive as a rotary vane vacuum pump, and the direct connection of the pump to the motor or the coupling is called a direct-coupled rotary vane vacuum pump. In each type of pump, there are also single-stage and two-stage points. In a single-stage pump, the ultimate pressure and use of the pump are different due to the different structural forms and parameters. Their common feature is that the structure is simple, easy to use, can be started from atmospheric pressure, can be directly discharged into the atmosphere, the eccentric mass is small, and the maintenance is simple. The ultimate pressure of the two-stage pump is 6×10-2～l×10- 2Pa, a single-stage pump can reach about 4Pa, and another single-stage pump is about 50~200Pa. Since 1909, W. Gaede invented the rotary vane pump and obtained the German patent. In 1936, the gas pump was invented. Since the patent was obtained in 1941, the rotary vane vacuum pump has been widely used and continuously improved. In the late 1960s, there was an international trend of increasing the speed and direct connection. In the early 1970s, a series of direct-connected products appeared. In the early 1980s, an improved series of products was introduced, and a variety of options were available for users. Accessories can protect the pump or protect the environment, and the structure of the pump itself is improved to improve reliability.Roots_Vacuum_Pump
Rotary vane vacuum pump, in the structure of the pump, in order to prevent oil return when the pump is stopped, some have a check valve that can automatically cut off the oil circuit, and some have an intake passage stop valve, some in order to When the pump is turned on, the gas circuit is automatically cut off when the power is suddenly turned off to keep the pump port in a vacuum state, and an oil pump and a control structure are provided. In terms of accessories, there are mist eliminators, odor filters, population filters for blocking debris such as broken glass, dust filters, steam condensation traps, chemical traps, and control pump temperature to increase water vapor removal rate and protect pumps. Temperature controlled water volume control valve.liquid-ring-vacuum-pump-of-vacuum-dewatering
In the late 1980s and early 1990s, an oil filter was introduced, an electronic display capable of monitoring oil temperature, oil pressure, oil quality, etc., and even a computer can be connected for automatic control, using forced lubrication and air cooling to make the pump The continuous working inlet pressure is 10 kPa or even higher, and the application range of the same pump is therefore greater.
Two-stage rotary vane vacuum pump, can be widely used in refrigerators, air conditioners, bulbs, fluorescent lamps, bottle liner production and electronics, metallurgy, medicine, chemical, oil filter, printing machinery, packaging machine and other industries, can be used as diffusion pump, Roots Pre-stage pumps such as pumps and molecular pumps are used for supporting and experimental research applications such as electronic instruments and medical instruments. Because the direct-coupled pump has no dust pollution caused by belt friction, it is widely used because of its small size, light weight, material saving and perfect function.
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