Rotary kinetic fluid motors or pumps – Runner or blade selectively adjustable relative to casing
Reexamination Certificate
2003-09-22
2004-11-30
Nguyen, Ninh H. (Department: 3745)
Rotary kinetic fluid motors or pumps
Runner or blade selectively adjustable relative to casing
C416S1700HM, C417S423100, C417S423700
Reexamination Certificate
active
06824354
ABSTRACT:
FIELD OF THE INVENTION
The invention refers to circulator pumps with two inlet ports and means to control these ports.
BACKGROUND
Instant hot water heaters are used alternatively to heat the domestic hot water and the heat carrier water of hydronic systems. For this purpose a three-way-valve is connected in series with the circulator pump whose first inlet port is connected with the domestic hot water circuit and whose second inlet port is connected with the hydronic circuit. When hot water is needed, the first inlet port is connected with the suction port of the impeller of the circulator pump; the change to room heating requires the closing of this first port and the opening of the second port, which needs two solenoid valves.
SUMMARY OF THE INVENTION
The invention shows a way to switch the suction port of a circulator pump from the first to the second circuit without any valves. This method is not restricted to circulator pumps for instant hot water heaters. According to the embodiments of the invention an electric circulator pump with spherical rotor is used.
REFERENCES:
patent: 2810345 (1957-10-01), Englesson
patent: 4091644 (1978-05-01), Bochan
patent: 4177018 (1979-12-01), Granet
patent: 4728260 (1988-03-01), Ishii
patent: 4874300 (1989-10-01), Laing et al.
patent: 4923366 (1990-05-01), Kern et al.
Foley & Lardner LLP
Laing Oliver
Nguyen Ninh H.
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