Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1988-08-05
1989-12-19
Shoop, Jr., William M.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219377, F24H 304
Patent
active
048884693
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to 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. The invention is also concerned with a control device for a convector of this type.
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.
One of the objects of the present invention is to construct an electric convector having two operating regimes, one being of the natural convection type and the other being of the air-blowing type in which the heating power can attain twice that of the natural convection regime. The convector consequently offers the advantages and efficiency of a double operating regime in regard to heating of premises but is not of larger overall size than a convector having a single natural convection regime and the same power or else has smaller dimensions than a conventional double-regime convector having identical maximum power.
A further object of the invention is to ensure optimum ease of use. The present invention also has for its object to propose a control device for the aforesaid convector which permits automatic regulation of the operating regimes of said convector and which is of simple design.
In accordance with the invention, this convector is characterized in that the compartment in which the impeller is rotatably mounted has a second opening which communicates with the interior of the convector enclosure.
By virtue of this opening formed in the wall which separates the impeller compartment from the convection chimney, an excessive temperature is avoided at the outlet of the chimney during the blowing regime. This result can be explained
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Hennuy Jean
Wojcik Guy
Seb S.A.
Shoop Jr. William M.
Wysocki A. Jonathan
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