PUMP Russian patent published in 1994 - IPC

FIELD: manufacture of pumps. SUBSTANCE: pump has thermal pipe 1 and heat source 2 located for delivery of heat to upper portion of pipe 1. Pump is also provided with cooler 3, suction line 4 and delivery line 5 equipped with check valves 6 and 7. Cooler 3 is lower portion of pipe 1 separated from inner space 8 of pipe by heat-insulating shell 9 whose lower end 10 is free and upper end 11 is tightly connected with upper portion of pipe 1. Shell is mounted at clearance 12 relative to cooler 3. Shell 9 may be made of polymer of trifluorochloroethylene (fluoroplastic-3) or polymer of tetrafluoroethylene (teflon). Their coefficients of thermal conductivity are lesser than that of steel by 800 and 200 times. Shell 9 may be also made of glass and the like heat-insulating materials. EFFECT: enhanced reliability. 1 dwg