Temperature responsive switch

Details Temperature responsive switch Temperature responsive switch

1986-07-08

1988-01-26

Levy, Stewart J.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

Expansible or vaporizable fluid actuated

200 83N, H01H 3740, H01H 3534

Patent

active

047219378

ABSTRACT:
A temperature responsive switch includes a housing(1) which can be secured to the engine block of a motor vehicle and a temperature sensitive element (4) which is in contact with the cooling medium of the motor. In order to guarantee switching dependent on the temperature (T) and the pressure (P) of the cooling medium, in the housing (1) a hermetically sealed bellows-capillary-unit (4) is disposed which responds to temperature (T) and pressure (P) of the cooling medium and around which the cooling medium circulates, being sealed against the housing portion through which the cooling medium flows, a movable switching contact (6) mounted on the bellows-capillary-unit (4) is disposed in a room (7) open towards the atmosphere and covered by a cover (8) and a fixed switching contact is disposed in said cover (8), and the bellows-capillary-unit (4) is filled with a liquid having a vapor pressure curve of between about 1,2 bar at 96.degree. C. and 1,8 bar at 110.degree. C.

REFERENCES:
patent: 2648741 (1953-08-01), Starbird
patent: 3742165 (1973-06-01), Hellman
patent: 3760396 (1973-09-01), Haselton
patent: 3809835 (1974-05-01), Watt
patent: 3882439 (1975-05-01), Wolfe
patent: 4535209 (1985-08-01), Korz
patent: 4563902 (1986-01-01), Kohnlechner
SAE Journal, vol. 75, No. 5, May 1965, pp. 80-81, New York, U.S.; D. L. Van Ostrom: "Vapor Pressure Comparator Will Operate Satisfactorily Under Abnormal Conditions".

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