Method and apparatus for controlling a bi-directional pump of a

Details Method and apparatus for controlling a bi-directional pump of a Method and apparatus for controlling a bi-directional pump of a

1998-03-13

1999-08-03

Bennett, Henry

Heating systems

Automatic control

Water

237 19, F24D 300

Patent

active

059313790

ABSTRACT:
Disclosed is a an apparatus for controlling a bi-directional pump of a gas boiler in which a shock noise generated when a rest or hot-water mode is switched to a heating mode, or when the heating mode is switched to the hot-water mode, during an operation of the gas boiler, is not produced. A bi-directional pump motor drives a bi-directional pump based on the selection of the heating or hot-water mode. A switching section selects a positive or reverse revolution of the bi-directional pump motor. A power control section controls an electric power supplied to the bi-directional pump motor via the switching section. When a rest or hot-water mode is selected while performing the heating mode, a control section cuts off the power supplied to the bi-directional pump motor via the power control section, and controls the switching section to be switched over to a motor reverse revolution switching terminal. Then, while increasing the power supplied to the bi-directional pump motor by degrees for a first time interval via the power control section, the control section operates the hot-water mode. When the heating mode is selected while performing the hot-water mode, the control section decreases the power supplied to the bi-directional pump motor via the power control section by degrees for a second time interval, and cuts off the supplied power. Thereafter, the control section controls the switching section to be switched over to a motor positive revolution switching terminal, and supplies the power to the bi-directional pump motor via the power control section. As a result, the gas boiler can operate in quiet.

REFERENCES:
patent: 5248085 (1993-09-01), Jensen et al.
patent: 5366153 (1994-11-01), Swenson
patent: 5692676 (1997-12-01), Walker

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