The commonly used mechanical pump in the laboratory is the rotary vane vacuum pump, also known as the rotary vane pump. It is composed of a stator and an eccentric rotor, mainly composed of stator, rotary vane and rotor.
The rotor is installed eccentrically in the rotor slot of the stator cylinder, which is tightly embedded with two pieces of rotary blades. Under the spring force, it is close to the cylinder wall of the stator, separating the air inlet and the air outlet of the stator into two parts. When the rotor rotates, the space of the air inlet is gradually expanded and the gas is inhaled, and the air space of the exhaust port is gradually reduced at the same time. The inhaled gas is compressed and discharged from the exhaust port, so as to achieve the purpose of vacuumizing. Vacuum pump oil is used as sealing fluid and lubricant for the whole machine and the vacuum pump oil which is not saturated with small vapor pressure.
2xz-2 rotary vane vacuum pump is commonly used in the laboratory, "2XZ" refers to two-stage direct coupled pump, "X" refers to rotary vane vacuum pump, "data behind 2XZ" refers to pumping rate (L / s). The two-stage pump is composed of two working rooms in series. Obviously, the limit vacuum of the two-stage direct coupled pump is better than that of the single-stage pump, which can reach a vacuum degree of about 10-1pa.
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