Rotary kinetic fluid motors or pumps – Including working fluid force responsive vane or flow control – Upstream of runner
Reexamination Certificate
2002-01-24
2003-11-18
Nguyen, Ninh H. (Department: 3745)
Rotary kinetic fluid motors or pumps
Including working fluid force responsive vane or flow control
Upstream of runner
Reexamination Certificate
active
06648595
ABSTRACT:
FIELD OF THE INVENTION
The invention refers to circulator pumps with two inlet ports and means to control these ports.
PRIOR ART
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 invention an electric circulator pump with spherical rotor is used, as described in claim
1
or the reversal of rotation of a circulator pump is used to switch between the two suction ports.
REFERENCES:
patent: 4091644 (1978-05-01), Bochan
patent: 4728260 (1988-03-01), Ishii
patent: 4923366 (1990-05-01), Kern et al.
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