Pump for secondary circulation

Details Pump for secondary circulation Pump for secondary circulation

1990-03-26

1992-09-01

Bennet, Henry A.

Stoves and furnaces

Liquid heater

Boiler receiving hot liquid or steam from stove or furnace

1373291, 137565, F24H 100

Patent

active

051430495

ABSTRACT:
In a plumbing installation wherein hot water is piped from a water heater or reservoir to a plurality of taps by a distribution conduit, an improved recirculation circuit of limited power consumption to continually pump small amounts of hot water from said conduit back into said reservoir which comprises a low power radial pump unprotected by a check valve against backflow, but having a rotary impeller with linear radial vanes leading to an annular output channel larger than necessary for maximum pumping throughput. The oversized annular channel and linear vanes limit the impact of any backflow upon the impeller and prevents its operating as a tubine as the pump is subjected to back pressure when a large amount of water is being drawn through the taps.

REFERENCES:
patent: 3096021 (1963-07-01), Lintvedt
patent: 3941517 (1976-03-01), Miyahara
patent: 4623093 (1986-11-01), Arndt

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