Matters needing attention in the use of screw vacuum pumps
Date: 2020-05-17 10:42 10:42, click: Author: screw vacuum pump.
Screw vacuum pump There will be various problems in the actual operation process, but because of the wide application rate of the advantage characteristics, for the better application, let's learn about the following. Screw vacuum pump What are the points for attention?
The screw vacuum pump must be installed on the level ground. During the installation phase of the vacuum pump, the pump port must be protected from welding slag or other debris into the pump. When the pump starts running, the starting filter screen must be installed at the suction port of the pump to avoid impurities or no clean welding slag being sucked into the pump to cause the screw rotor to die or even damage the whole pump. If there is dust or particulates in the inhalation gas, a dust remover or filter must be installed before the suction port. The pipeline should choose a pipeline equivalent to the diameter of the suction and exhaust port of the vacuum pump. It can not be changed. The smaller the suction pipe diameter will limit the pumping capacity of the pump, and the smaller the exhaust pipe diameter will cause the phenomenon of exhaust obstruction and pressure holding, which will lead to leakage of the seal, overload of the motor and even the failure of the whole pump. In addition to installing the intake valve, vacuum suction valve should be installed at the suction port of the vacuum pump to avoid sudden shutdown or other failure shutdown, resulting in reverse rotation of the screw rotor caused by vacuum suction in the system, resulting in unnecessary losses.
Screw vacuum pump should carefully check the couplings before commissioning. If necessary, readjust it, make a simple barring before starting, ensure that there is no rust or stuck, then open the cooling water inlet and outlet valve, point the motor, make sure that the motor is turned right and start the vacuum pump again. Cooling water is used to cool the front, rear end cover and pump body jacket. The lubrication of the vacuum pump is divided into driving end and non driving end. The gear box of the driving end is lubricated by vacuum pump oil, and the non driven end adopts high temperature grease. The intake temperature of screw vacuum pump should not be higher than 50 C, the outlet temperature is 150 C, the pump body temperature is 90 C, the fuel tank temperature is 70 C, the suction end bearing temperature is 120 C.
The starting sequence of screw vacuum pump: first, open the cooling water, turn on the power supply, and turn on the main valve of the gas port; stop order: first close the intake main valve, then open the purge and clean the valve for 10 minutes, turn off the power supply, turn off the cooling water, turn off the purge and clean the valve, and purge and wash can remove the residual medium in the pump and the compressed steam that may accumulate in the pump. If the operation is stopped for a long time, the valve on the main road should be closed before shutting down. The nitrogen will be continuously cleaned for 20~30 minutes through the purging cleaning port, then cleaned by inhalation of diesel oil and then cleaned. If the pump needs to be stopped for a long time in the winter, it is necessary to drain the cooling water in the pump so as not to cause the frost crack of the pump body at low temperature.
The above is the matters needing attention in the use of screw vacuum pumps. Only by operating according to the regulations can we achieve good results and extend the service life. If you do not understand, you can contact us. We will give you professional advice to avoid blind operation and cause losses.