Questions about high temperature hot water pump flushing
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As shown in the figure, the sealing chamber is simplified into the fluid area (translucent part) in the figure. I found the flushing plan option plan21 on the Internet, 1. I would like to ask the distance between the flushing port and the sealing end face L=? 2. Does this cyclic flushing mean that it is flushed and operated at the same time? Or is the device shut down for flushing? , 3. Inlet pressure? What is the temperature of the rinse solution? Export pressure? temperature? I would like to know more about it, because I want to use Flunt to do a fluid simulation of a sealed cavity, derive the loads (temperature, pressure) on the outer walls of the dynamic and static rings, and conduct a comprehensive thermal fluid-solid coupling analysis. I would be very grateful.
1. Distance L varies from manufacturer to manufacturer and can be handled flexibly.； 2. I don’t know what you mean by circulating flushing. What I understand is PLAN21 external circulation.: Outlet high pressure-sealed chamber ； 3. The inlet pressure depends on the working conditions and can be regarded as normal pressure. The flushing fluid is the medium. What is the outlet pressure? ? ? ? Outlet temperature? ? ? ?
What I mean is that when using plan21 external circulation, is the flushing fluid the sealed medium itself? Or is it that the flushing fluid is a new medium that flushes the outer wall of the sealing ring and its end face to cool it down? Is the pump running all the time during this process? The flushing fluid flows out of the outlet after cooling down in the seal chamber. What is the pressure of this? Is it flowing out freely? And what is the temperature of the flushing fluid flowing out from the outlet after flushing? Is it still the same temperature as when it entered?
L should be as small as possible. The flushing fluid is the cooled medium itself, not an external new medium. The flushing process works with the pump running and stops when the pump stops. The sealing chamber pressure should be 1-2kg/cm2 higher than the pump inlet pressure. The pressure should not be too high or too low, because the temperature here is slightly higher than the inlet. Therefore, the pressure value should be such that the flushing fluid does not vaporize, especially for media with high vaporization pressure. The flushing fluid pressure can be jointly controlled by the orifice plate and the throat gap.
After the outlet medium cools down, it enters the machine seal for flushing.