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WORKING PRINCIPLE

Liquid ring vacuum pumps are suction pumps.  While  the  moving  part,  (the  shaft  and  the  impellers)  which  are  mounted  eccentric  from  the  center  axis  of  the  pump casing. As  the  rotor,  the  shaft  and  the  impellers  turns  the  liquid  in  the  pump casing  forced outwards by centrifugal  force.  A liquid ring forms along the body wall. Because of the eccentricity of the rotor the cells between pump casing and the rotor blades are filled with liquid at different amounts. The cells which are in the top position are completely filled with liquid and as the impeller rotates through half a revolution the liquid is replaced by gas. As rotation continues the liquid forces the gas through the discharge port. This cycle is repeated for each cell of the impeller and results in a steady flowing source of vacuum.

 


SERVICE LIQUID SYSTEMS

During working, to eliminate the heat which is produced because of the compression of the sucked gases, must be supplied service liquid continuously. Generally water is used as service liquid. During working of the pump the temperature inside the pump increases, that’s why service liquid must be as cool as possible (below 15 ºC is suitable).


A) ONCE THROUGH-NO RECOVERY SEALANT SYSTEM

This connection is used where adequate sealant flow is available from outside source, or where contamination of sealant may be a problem.

B) PARTIAL RECIRCULATION


This connection is used to conserve sealant. Make up sealant is supplied from an outside source or water main. Remainder of sealant is supplied from recirculation tank.

 


C) TOTAL RECIRCULATION


This connection is used to conserve sealant, or where compatible sealant is not available from an outside source. Cooling is provided by running sealant through a heat exchanger. Separate cooling liquid or gas is required.

 

 


 
 
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