Difficulty starting the vacuum pump
Thread Content
The water ring vacuum pump installed in our company has started to experience significant difficulties in starting after 2 months of operation; it is not possible to rotate the drive shaft manually when the pump is not under load. After another approximately 10 days, it now requires 2–3 attempts to start before it can operate. To protect the motor, we are forced to suspend production at present, and we urgently need guidance from professionals.
How is its operating condition? Is there any vibration or noise? The pump can no longer be used (it’s just a problem with the pump); the most straightforward solution is to disassemble it for repair and replace the bearings or other components.
What material is it used to pump? Is there severe coking inside the pump that requires cleaning? In that case, cleaning of the coke can be carried out based on its type, without necessarily requiring disassembly and repair.
It’s better to take it apart and check; the gap is very small, and sometimes just replacing a gasket is sufficient.
The clearance inside the water ring pump’s chamber is very small; this situation can occur if materials or other impurities get into the system. Another possibility is wear on the bearings. It is recommended to turn the machine on and carry out a cleaning operation – usually, the problem can be identified once the machine is started. Since it is still able to operate without breaking down, it indicates that the issue isn’t serious~
It is recommended to disassemble the pump to check the clearances inside it and the condition of the bearings.
It is recommended to undergo a disassembly inspection. Check the gap and verify whether there is any medium on the impeller.
The gas pumped by the vacuum pump may tend to form scale, so it needs to be cleaned regularly. In the case of a water-ring vacuum pump, it is necessary to drain the large amount of water inside the pump, but some water must remain. When adding water, the pump can be started by checking the water discharge mechanism; too much water inside the pump will result in an excessive starting current, leading to failure to start the pump
There are many reasons for this problem, and it’s impossible to explain them in just a few words. Here’s a link; you might find the answers you’re looking for there. See link: http://edu.pumptech.cn/?action-viewthread-tid-13940
You can even get the car moving before it starts – amazing! 1. Check the bearings. 2. Check for any friction between the internal moving and stationary parts, as well as for any foreign objects stuck inside the pump
The operation method must be correct: the intake valve must be closed when starting, water should be added after startup, and the intake valve should be opened only once the vacuum level is normal. If turning the pump by hand before starting proves difficult, it is necessary to check the bearings of the pump and motor (making sure to maintain proper daily lubrication). To extend the service life of the vacuum pump, it is important to keep the water inside the pump at a neutral level, and to prevent both coking and corrosion. When stopping the pump, close the air inlet valve first; after shutting it down, drain the water. When the water temperature is high during operation, it is necessary to consider adding water at a lower temperature to cool it down.