Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1988-08-05
1990-03-27
Leung, Philip H.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219370, 219486, 219511, F24D 1900
Patent
active
049123009
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a control device for a heating appliance such as a convector with electric heating resistors having two operating regimes, the first being a natural convection regime and the second being an air-blowing regime obtained by means of a blowing unit.
This type of convector is primarily intended for heating premises. It usually has two operating power levels. Thus the convector is first employed at full power in the blowing regime so as to permit a rapid temperature rise of the premises without any interruption of power supply and then, when the reference temperature is attained, at low power without blowing and in the natural convection regime, the temperature of the premises being in that case regulated for example by means of an electronic on/off thermostat or the like.
The dimensions of the convector of the abovementioned type must be such that, in any operating regime, the temperature of its different parts which are accessible to the user do not exceed maximum permissible values or else values laid down by the manufacturer on the basis of even more stringent quality standards.
In electric convectors having two operating regimes which are already known, one regime is of the forced convection type in which air is sucked-in from the exterior of the convector, passes through the heating resistor and is then blown to the exterior into the premises to be heated. In this design, egress of hot air takes place through one or a number of outlet grids, the arrangement of which in the upper portion of the convector is essentially adapted to operation in the natural convection regime.
Investigations made by the present Applicant have in fact shown that, psychologically, users prefer that, in the blowing regime or in other words in the forced convection regime in this case, hot air should be delivered in front of the convector and in the lower portion of this latter.
As disclosed in patent No. FR-A-2,576,673 in the name of the present Applicant, there is also known an electric convector having an enclosure forming a convection chimney which has a bottom air delivery opening and a top air delivery opening. The resistance element is placed within the enclosure downstream of the bottom air admission opening. In this design, an impeller is placed within the enclosure in order to extract part of the hot air formed by natural convection within the convection chimney and in order to blow part of this air through an additional hot-air delivery opening formed in the front wall of the enclosure. A convector of this type operates in the two regimes aforesaid, changeover from one to the other being carried out manually by the user.
The present invention also has for its object to propose a control device for heating appliances of the type aforesaid which permits automatic regulation of the operating regimes of these appliances and which is of simple design.
In accordance with the invention, the control device for the aforementioned appliance, in which a thermostat is interconnected between the source of supply and the heating resistor comprising two heating elements, one of which is supplied only during one of the regimes of this appliance, is characterized in that a temperature limiter is interconnected between the source and said heating element which is supplied only during one of the regimes of the appliance, this temperature limiter being sensitive to the heat produced by a resistor having a high resistance value so as to cut-off the supply of said heating element at the time of initial opening of the thermostat switch.
In an alternative embodiment, said control device is characterized in that a resettable relay is interconnected between the thermostat and said heating element which is supplied only during one of the regimes, the coil of said relay being mounted in parallel with said element so as to ensure that the relay opens in order to cut-off the supply of said element at the time of initial opening of the thermostat switch.
Thus the combination of a thermostat and temperature limiters or
REFERENCES:
patent: 4085309 (1978-04-01), Godel et al.
patent: 4170729 (1979-10-01), Lane et al.
patent: 4604516 (1986-08-01), Metz
Hennuy Jean
Wojcik Guy
Gaffin Jeffrey A.
Leung Philip H.
Seb S.A.
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