The function of the small pump in the pump
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There is a pump with a siphon tank, along with a small pump as well. What is the small pump used for? My workshop equipment technician said that I should start the small pump first, and then start the large pump; once the large pump is running, the small pump should be turned off. As shown in the picture. Thank you, extra points!
The large pump isn’t very clear to see; from its shape, it seems to be a high-speed pump. The small pump is used to generate the lubricating oil pressure when the high-speed pump starts up. Once the large pump is operating, it can maintain the oil pressure through its own shaft pump, so the small pump can be turned off. Yours is electric; in many high-speed pumps, the oil pump used for starting is manual.
It seems to be that the flushing prevention pump is operating without liquid
This pump is operating in reverse flow; how is it possible for it to run without liquid?
Judging from the diagram, the large pump is likely a high-speed pump, while the small pump is an auxiliary lubricating oil pump. Before starting the large pump, it is necessary to activate the small pump for lubrication; the large pump may only be operated when the lubricating oil pressure is above 0.2 MPa. Once the large pump is started, its built-in shaft pump can maintain the oil pressure at above 0.2 MPa, and the small pump (auxiliary oil pump) stops operating. If the oil pressure from the shaft pump drops below 0.2 MPa, the small pump (auxiliary oil pump) starts automatically to ensure proper lubrication.
For vertical high-speed pumps, start the smaller pump first to lubricate the gears inside the high-speed pump’s casing, and then start the high-speed pump itself. There is a small gear pump in the high-speed pump’s gearbox that rotates together with the pump shaft. In essence, its working principle is similar to that of the shaft oil pump and auxiliary oil pump in reciprocating compressors: the auxiliary oil pump should be started first when starting the pump, and it also needs to be started first when stopping the pump
3rd floor is correct~~~ no need to repeat it~