H piston vacuum pump start and stop
Preparation of H piston vacuum pump before starting
Check that the degree of belt tightness of the H piston vacuum pump can be loosed before starting. After starting, adjust the bolt on the base and tighten it slowly to reduce the starting torque.
② Check whether all parts of H piston vacuum pump are loose and whether the motor steering meets the requirements of the pump.
③ Check whether the oil level in the tank of H piston vacuum pump is about half of the oil mark on the oil tank.
④ For the H piston vacuum pump which has not been working for a long time, the method of starting the motor intermittently before starting is used to check whether the rotation is flexible.
⑤ Open the cooling water valve.
⑥ In winter, if the room temperature is too low, the H piston vacuum pump should be heated before starting. Because the oil viscosity is high at low temperature, sudden starting will overload the motor and damage the pump parts.
⑦ If the oil level of the oil mirror on the oil tank is significantly different from that when the oil level is stopped, the pump pulley must be turned to make the oil in the pump cavity of H piston vacuum pump be discharged into the oil tank before starting. In the vacuum state, at the same time more oil stored in the pump cavity, the pump is not allowed to start.
H piston vacuum pump start:
(1) Turn on the power switch and start the motor.
(2) Check whether the cooling water is normal and whether the lubricating oil is normal.
(3) After running for about five minutes and all aspects are normal, slowly open the intake valve to avoid the sharp increase of pump load.
H piston vacuum pump stop:
The shutdown of H piston vacuum pump is particularly important, otherwise it will be difficult to start the next time. In principle, the shutdown should be carried out according to the following procedures:
(1) Close the intake valve on the intake pipe.
(2) Open the charging valve to destroy the vacuum in the pump.
(3) Wait about half a minute and cut off the power.
The above working process can not be careless, otherwise, when h piston vacuum pump stops, because the pump cavity is still vacuum, oil in the oil tank will flow into the pump cavity continuously, making the pump cavity full of oil. From the perspective of shutdown, this is not much harm, but problems will arise when starting again, that is, when the pump cylinder is full of oil, almost all the rotors turn the first circle On the other hand, because the oil can hardly be compressed and viscous, it will be squeezed out of the small exhaust port of H piston vacuum pump, and the resistance is very large. Therefore, the motor can not require very large starting torque, and the shaft and eccentric wheel will increase huge impact force in an instant, which is very dangerous to the pump and motor, especially the ring This is especially true when the ambient temperature is low. If the above procedures are followed, the above hazards can be avoided.
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