Electric resistance heating devices – Heating devices – Continuous flow type fluid heater
Patent
1995-07-17
1998-03-10
Hoang, Tu B.
Electric resistance heating devices
Heating devices
Continuous flow type fluid heater
392484, F24H 110
Patent
active
057271186
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a novel type of boiler making it possible to raise a heat-transfer liquid to a predetermined temperature.
It relates more particularly to a novel type of electric boiler making it possible to ensure production of hot water, for example when it is desired to produce hot water for domestic use (circulation of water in an open circuit), or for installations for heating water circulating in closed circuit (industrial heating, domestic heating, etc.).
More precisely, it relates to a novel type of boiler, the general structure of which employs heating means of the type of those described in WO-A-93 20389 for producing heat exchangers used in many industrial sectors (chemical industry, pharmaceutical industry, etc.), and which makes it possible to thermally regulate a fluid.
According to the teachings of the aforementioned document, such exchangers are in the form of an assembly comprising plates having, on both their faces, corrugations, for example herringbone corrugations, clamped together between two end walls by means of ties and which include, in their corners, openings which delimit, in the stack, inlet and outlet passages allowing circulation of fluids and which flow against the surface of said plates in the space lying between them. According to the teachings of this document, a heating plate, being in the form of a uniform block inside which a heater resistance element is embedded, the outside dimensions and the structure of the external faces of which block correspond to those of the elementary plates and which also includes, in its corners, orifices corresponding to those of said plates, may be inserted between two plates.
Now, it has been discovered, and it is this which forms the subject of the present invention, that it was possible to produce an actual electric boiler for heat-transfer liquid circulating in an open or closed circuit, which boiler may he easily adapted depending on the desired power for any type of installation by using such assemblies consisting of two stamped plates, the corrugations of which are in the same sense on both their faces and between which is inserted a heater block which is in the form of a uniform block, said assembly according to the invention being characterized in that:
the herringbone corrugations that the heater block has on both its faces are oriented in opposite senses;
the resistance element embedded in the central part of said heater block extending parallel to the active faces, electrical connections being arranged laterally.
Such an adaptation, according to which the herringbone corrugations or ribs of the two external faces of the heater block are opposingly oriented, contrary to the stamped elementary plates in which they are in the same sense, makes it possible to juxtapose several heater blocks and to obtain a standard channel for the circulation of the fluid while at the same time having electrical connections located on the same side of said plates, thus making the connection to an electrical box much simpler.
SUMMARY OF THE INVENTION
In accordance with the invention, in order to produce a boiler, the heater block will be in the form of a parallelepipedal assembly having a thickness markedly greater than the elementary plates, making it possible to incorporate a heater resistance element in its central part.
The heater block may include a single resistance element, but its structure also makes it possible to envisage incorporating into this heater block three electrical resistance elements connected to a three-phase source.
By way of indication, such a heated block will have a thickness of from fifteen to twenty millimeters, while the stamped elementary plates themselves, arranged on either side of said block, have an overall thickness of the order of three millimeters (distance between the corrugations on each face).
The heater block is made from any thermally conductive material, especially from materials such as metals (for example aluminum), graphite, plastics and composites.
Such
Chopard Fabrice
Roussel Claude
Hoang Tu B.
Vicarb
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