Refrigeration equipment in GVD8 | GVD12 rotary vane vacuum pump structure and common fault -

in order to make the final assembly is successful, the refrigeration system for air tightness test and leak detection, must perform fully vacuum ( Vacuum) 。 If air conditioning and refrigeration equipment repair, maintenance personnel often use GVD8 | GVD12 rotary vane vacuum pump system. The vacuum degree should be - 0. 1 mpa, for a full 24 hours, and vacuum degree can increase without significantly increasing. Time is the use of vacuum pump or compressor to refrigerant cycle system, to vent air from system and residual moisture. This article introduces the refrigeration equipment of GVD8 | GVD12 structure and common faults of rotary vane vacuum pump.

refrigeration equipment refers to is mainly used for cooling in the summer the crew's food, refrigeration and all kinds of goods and cabin air conditioning equipment. It is mainly composed of compressor, expansion valve, evaporator, condenser, and its accessories and pipelines. According to the working principle, can be divided into compression refrigeration equipment, absorption refrigeration equipment, steam jet refrigeration equipment, ReBengShi refrigeration equipment and electric heating refrigeration equipment.

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

rotary vane pump is mainly composed of pump body, rotor, vane, plate, springs, etc. Rotor eccentric installed in rotary vane pump cavity, and the surface of the cylindrical rotor cavity and pump in the tangent ( The gap between them is very small) 。 In the rotor slot installed two rotor with a spring. In the process of rotation, the top of the rotary vane by centrifugal force and the spring tension keep in contact with the inner wall of the pump housing. The rotor rotation to drive the rotary vane along the pump cavity wall slip.

the surface of the cylindrical rotor and the pump cavity and tangent, rotating blade is installed in the rotor picks. Under the action of the spring, it always has the close contact with the stator cavity wall. When the eccentric rotor under the traction of the motor rotates, the rotor rotation. Clockwise, inspiratory mouth will continue to breathe in. Air intake cavity expands unceasingly. At the same time, the discharge cavity is more and more small, suction gas has been completely compressed, pressure rise. After reaching certain pressure, exhaust valve can Pierce oil pump, and is discharged through outfalls trachea. This continuous cycle can have the effect of vacuum.

the system pressure and leak testing, confirm that there is no air leakage, and vacuum pump has been properly connected to the system piping. If it is found that vacuum degree, do not meet the specified requirements vacuum pump must be checked for damage or quality problems.

1) First, check whether the amount of oil in the pump is lower than the standard line, and whether oil dirty, 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, cause the clogging in suction circuit or lower efficiency.

3) Check whether the motor drive belt is loose or skid, which leads to the lack of eccentric rotor speed.

4) Check whether the pumping speed of vacuum pump is suitable for pumping system. If it is small mara car running out of steam.

5) After eliminating these reasons, should open vacuum pump, and check the seal, leaf spring, exhaust valve and pump cavity of other parts. If they are damaged, should repair or replacement.