Electromechanical device for the protection of a pump in waterwo

Details Electromechanical device for the protection of a pump in waterwo Electromechanical device for the protection of a pump in waterwo

1994-04-26

1997-09-30

Thorpe, Timothy

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

417 442, 417 449, 417 12, 200 819R, 200 83J, F04B 4906

Patent

active

056720491

ABSTRACT:
The device comprises: a branch (5) from the outlet (M) of the pump to a cavity (7) partially delimited by a membrane (14); a moving element (16, 22, 24) in a casing (9); a spring (36) pushing said element (16, 22, 24) toward the membrane (14) and capable of yielding under the action of a relatively restricted pressure of the water which reaches said cavity (7) and acts on the membrane; and moving electrical contacts (26) on said element (16, 22, 24), interacting with fixed contacts (28) of a supply circuit of the pump, to enable the pump to be switched on and to switch it off in the absence of pressure acting on the membrane (14).

REFERENCES:
patent: 2118130 (1938-05-01), Aikman
patent: 2554266 (1951-05-01), Pauly
patent: 3106894 (1963-10-01), Johnsen
patent: 3139493 (1964-06-01), Krieger, Sr. et al.
patent: 3143969 (1964-08-01), Eames et al.
patent: 3235683 (1966-02-01), Beeman
patent: 3738776 (1973-06-01), Debare
patent: 4118148 (1978-10-01), Allen
patent: 4200775 (1980-04-01), Bodnar
patent: 4215254 (1980-07-01), Ohki
patent: 4848097 (1989-07-01), Roberts
patent: 5292232 (1994-03-01), Krohn et al.
patent: 5320280 (1994-06-01), Murphy et al.

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