Thermostatic control devices

Details Thermostatic control devices Thermostatic control devices

1985-06-07

1987-08-11

Rosenthal, Arnold

Valves and valve actuation

Heat or buoyancy motor actuated

236 68R, 236 93A, 60527, F16K 3104, G05D 2319, F03G 706

Patent

active

046856510

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a thermostatic control device of the type comprising a hollow capsule forming a chamber, through one end wall of which a piston passes and which is filled with an expansible substance whose volume varies with the temperature in such a manner as to convert the variation of volume of the substance into an axial displacement of the piston, and further comprising a thermal means in thermal contact with said substance in such a manner as to vary its temperature for the purpose of axially displacing the piston or controlling its displacement relative to the capsule.
Thermostatic control devices of this kind are at present used particularly in the field of motor vehicles. The thermal means consists of a fluid circulating outside the capsule, while the piston serves to control a valve in dependence on the temperature of the fluid. From French Patent No. 2 456 838 a thermostatic control device is also known which is disposed in the fluid circulating in a pipe, and the body of which is movable while the piston is fixed. In this known device a cylindrical bulb fixed to the piston is disposed in the chamber filled with expansible substance and contains an electric resistor fed via the piston, the duct for the flow of the fluid, and its wall.
The present invention seeks to overcome the shortcomings of the prior art and to enlarge the field of use of thermostatic control devices of the type described above, to achieve a considerable improvement of the control and/or variation of the speed of the volume of expansible substance contained in the capsule in a simple manner in order to shorten the response times, and to propose simple connection structures which nevertheless enable the very high internal pressures of the expansible substance to be withstood.
In a first embodiment of the present invention, in which the thermal means comprises at least one electric resistor, the thermostatic control device of the abovementioned type is one in which this electric resistor is carried by the wall forming the opposite end of the capsule to the wall through which the piston passes, this resistor being fed with electric energy through this end wall and extending into the expansible substance in such a manner as to be in direct thermal contact with said substance over at least a part of its length. In this way, the electric resistor is fixed relative to the capsule and therefore held in a suitable manner, and the dispersion of the heat between the electric resistor and the expansible substance is excellent, so that the electric powers necessary for the variation of volume of the expansible substance can be relatively low.
In another embodiment the electric resistor is a wire resistor. In yet another embodiment the electric resistor is an armoured wire resistor comprising an electric wire extending in a casing along its axis, this casing being electrically insulated from this electric wire and being a conductor of heat.
In another embodiment, the electric resistor is printed on an insulating support. In this embodiment the insulating support preferably extends over the periphery of the chamber containing the expansible substance, while the electric resistor is printed on the inner face of this insulating support.
For the purpose of supplying this electric resistor with electric energy, there are preferably provided two electrically insulated conductor pins which pass sealingly through the end wall of the capsule, the ends of the electric resistor being respectively fixed to the inner ends of these pins, while their ends outside the capsule are adapted to be connected to a source of electric energy.
In the embodiment in which the electric resistor is an armoured wire resistor, according to the present invention the ends of this resistor extend through the wall forming the end of the capsule, the ends of its casing being soldered to this end wall and the ends of its electric wire being electrically connected, outside the capsule, to electrical connections carried by the ends of its casing or by the end w

REFERENCES:
patent: 3029595 (1962-04-01), Sherwood
patent: 3169008 (1965-02-01), Whitlock
patent: 3263411 (1966-08-01), Carlson, Jr. et al.
patent: 3399543 (1968-09-01), Matthies
patent: 3439711 (1969-04-01), Sherwood et al.
patent: 3442078 (1969-05-01), Nolan

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