The structure and common faults of refrigeration equipment in vacuum pump _

in the air conditioning and refrigeration equipment repair, maintenance personnel usually use vacuum evacuation system. The vacuum should be - 0. 1 mpa, for a full 24 hours, and vacuum degree will not significantly increase.

1。 The structure and working principle of vacuum pump

common vacuum pump is rotary vane vacuum pump, mechanical pump is a pump oil seal.

and tangent pump cavity surface, the cylindrical rotor rotating blade is installed in the rotor to choose. Under the action of the spring, it is always closely contact with the stator cavity wall. When the eccentricity of the rotor under the resistance of the motor rotates, rotating rotor blades. Clockwise, continuous suction inlet gas. Air intake cavity expanding. At the same time, the discharge chamber are getting smaller and smaller, and the first inhaled gas is fully compressed. Pressure rise, after reach a certain pressure, exhaust valve can through the pump oil flushing and from the exhaust pipes. The cycle does not stop, it can have the effect of vacuum suction.

2。 Common faults

press and test the system, make sure no leak, if vacuum pump and system pipe connection is correct, if it is found that vacuum degree below the specified requirements, the vacuum pump must be check for damage or quality problems.

1) First check the pump oil is lower than the standard of the pipeline, oil whether be blotted out, saponification or overflow is too low, so that gas doesn't spill out.

2) Check the inlet valve of the metal mesh is blocked by dirt or foreign body, resulting in a decline in suction circuit failure or efficiency.

3) Check whether the motor drive belt is too loose and sliding, led to the eccentricity of the rotor.

4) Check whether the pumping speed of vacuum pump is suitable for pump system. If it is 'small mara carts,' not enough power.

5) After all these reasons to eliminate, should remove the vacuum pump, if damaged, shall check and repair or replace the seals, the rotor spring, exhaust valve pump cavity and other parts.

3。 Replace the vacuum pump oil

the first open the vacuum pump is about 0. 5 h, make the oil more thin, then stop the vacuum pump, the oil discharge orifice discharge of oil, and then open the suction mouth 1 ~ 2 min. During this period, you can add a small amount of cleansing oil, slowly from the suction to replace oil pump cavity.