Heating systems – Heat radiators – Shields
Patent
1994-01-03
1995-10-03
Tapolcai, William E.
Heating systems
Heat radiators
Shields
165135, F24D 1906
Patent
active
054545129
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a cover for a heat source, in particular for a heating body, such as hot liquid containing tanks, radiators and the like, comprising a thin wall screening at least partially the heat source from the outside.
BACKGROUND OF THE INVENTION
These covers of this type are already known for a long time, in particular covers in enamelled, lacquered or chromium-plated plate or cast iron.
These covers involve technological problems with respect to their forming and colouring. Moreover, they are not transparent for infrared radiation emitted by the heating device when this device is for example a heating body, more particularly a domestic stove. After having covered the latter, the ambient atmosphere can only be heated by convection.
JP-A-59202337 discloses a protective grate which is to be placed on the radiation surface of a radiator, the grate being of polyester and having large openings for allowing the heat to pass therethrough.
SUMMARY OF THE INVENTION
An object of the present invention is to work out a cover as described hereinabove which avoids the aforesaid drawbacks while being not expensive and easy to manufacture. Advantageously, this cover will allow to increase the comfort of a heating body by allowing radiation heating.
In order to solve these problems, a cover as described hereinabove was provided, according to the invention, wherein said thin wall is based on a polymeric material having a high rigidity and a good deformation strength at a temperature above 100.degree. C., and wherein the used polymeric material has a low infrared absorption at wavelengths corresponding to black-body temperatures of 200.degree. C. to 500.degree. C. Covered with such a cover, a heating body will be able to heat the ambient atmosphere not only by convection but also by radiation, which results in considerably higher energy savings and an improved impression of comfort. Advantageously, the used polymeric material shows these properties at a temperature above 130.degree. C., preferably above 200.degree. C.
By deformation strength it has to be understood that the wall from polymeric material resists to a permanent deformation. When a mechanic pressure is for example exerted onto this wall, it does not bend or possibly it may inflect in an elastical way while taking in afterwards its initial position again. At the indicated temperature, the wall is also not subject to flow.
The use of a non-metal material offers the big advantage of a simple and well known manufacture process, for example by moulding, thermoforming or by an analogous process. This allows also to stain the polymeric material in the mass with a colorant or a pigment and hence to omit the application of a coloured coating. Finally, a large freedom of design is achieved by such a cover from polymeric material, which is a non-negligible quality for such an element serving to mask another.
A cover of this type is moreover relatively light and easy to handle.
According to an embodiment of the invention, the plastic material is a polyester resin. Advantageously, the polyester resin is selected within the group comprising bisphenol A fumarates, isophthalic resins and chlorendic resins.
In a particularly advantageous way, the polymeric material is an oriented crystal polymer, for example a lyotropic liquid crystal polymer such as Kevlar, or a thermotropic liquid crystal polymer such as Rhodester CL. In this case, a cover resisting to temperatures of 350.degree. C. might even be taken into consideration.
In a very particular embodiment of the invention, the thin wall is made of a composite material containing said polymeric material. In the composite material, the polymeric material may be reinforced with fibres, for example a.o. with glass fibres, carbon fibres, liquid crystal polymers. In certain applications, the composite material may also be composed of at least one possibly reinforced layer of said polymeric material and of at least one layer of another material supporting the previous layer.
Other pa
REFERENCES:
patent: 1892954 (1933-01-01), Kauffman
patent: 2476432 (1949-07-01), Sawyer
patent: 2865569 (1958-12-01), Levenberg
patent: 3090212 (1963-05-01), Anderson et al.
patent: 3315846 (1967-04-01), Landis et al.
patent: 4383575 (1983-05-01), Bobrowski
patent: 5307849 (1994-05-01), Nelson
Berlaimont Claude
Champion Raymond
Nestor Martin S.A.
Tapolcai William E.
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