Rotary vane vacuum pump working principle and method of using _

lab commonly used vacuum pump of the rotary vane vacuum pump. It is mainly composed of pump body and the eccentric changed hands. Machined installation with spring under the eccentric rotor slice, driven by a motor, eccentric rotor water pump chamber wall clinging to rotate. Sliding vane by spring pressure is xian pump chamber walls. Sliding vane continuous operation in the pump chamber, which divided by vane pump cavity salty two different guest product increase and decrease in cycles. After the gas from the air intake mouth, compressed exhaust valve discharge pump in vitro. Cycling will decrease the pressure inside the system.

rotary vane in the whole mechanical pump parts in the vacuum pump oil, the oil vapour pressure is low, as well as lubrication, and can be closed small leak and cooling parts.

when using mechanical pump should pay attention to the following:

1) mechanical pump can not transfer can non-condensable gas steam, volatile liquid, etc. Because the gas enter the pump damage the quality of the vacuum pump oil and reduce the sealing and lubrication in the oil in the pump, even making hand pump parts rust. And therefore must be done before can be cast into the pump of gases through the purification device. For example, using anhydrous calcium chloride, two phosphorus pentachloride and points in screen absorb moisture; Absorb with paraffin deposit machine steam; With activated carbon or silicon limb to absorb other steam, etc.

(2) mechanical pump cannot be used for pumping corrosive components of gas. Such as hydrogen chloride, neon gas, carbon dioxide, ammonia, etc. For this type of gas can quickly erode pump precision machining of parts surface, make the pump leakage, cannot achieve the required vacuum degree. In this case, it shall make the gas before into the pump by absorbing bottle containing sodium hydrogen atmosphere, solid, to remove harmful gas.

3. Mechanical pump driven by a motor. Should be paid attention to when using the voltage of the motor. If three-phase motor driven pump, used for the first time special pay attention to three hodginsii motor rotation direction is correct. During normal operation should not have equal friction, metal lighting strike. Operation when the motor temperature should not exceed 50 a 60 ℃.

(4) the mechanical pump intake should install a three-way piston before p. Stop smoking gas should make mechanical pump and the fit system separated by and atmosphere are interlinked, then turn the power off. This can keep the vacuum system, and to avoid vacuum pump oil breath.

method of use:

check inlet pipe on the surface of the glass in front of the three links the piston and test bench copper three piston is in a state of 'open', and then plug in the power plug.

pump overlapping port operation shall not exceed 1 min straight through to the atmosphere.

before stop the oil pump operation, should make the pump and the atmosphere are interlinked, so as to avoid vacuum pump oil into absorption system.

in the process of pump work, lab suddenly loses power or power failure, when a gas cylinders quickly open the smoke vent piston, so as to avoid vacuum pump oil pollution caused by the pump cylinder and system and the normal operation of the pump.