Electric resistance heating devices – Heating devices – Tank or container type liquid heater
Reexamination Certificate
2000-06-26
2001-07-24
Walberg, Teresa (Department: 3742)
Electric resistance heating devices
Heating devices
Tank or container type liquid heater
C392S441000, C392S449000
Reexamination Certificate
active
06266484
ABSTRACT:
TECHNICAL FIELD
The present invention relates to the field of apparatus for water heating or water heaters. The invention herein has been designed with special reference to electric water heaters, in particular those made of plastic materials.
BACKGROUND ART
Plastic materials are generally used for building water heaters of the type mentioned above, in order to avoid the drawbacks of traditional apparatus comprised of metal tanks which need to be specially arranged to withstand corrosion.
Document E
2
-A-0 674 139 shows a water heater made by joining two shells of a single plastic material, in particular polypropylene.
Document FR-A-2 620 803 shows a water heater with a shell of thermoinsulating expanded material, coated with a polyurethane foam jacket.
All water heaters of a known type mentioned above have a small capacity and cannot stand high pressures, for example operating pressures of 8 bar, at temperatures of up to 90°-100°. They can stand, however, peak pressures of at least 16 bars as required by the field regulations in force. In addition, water heaters of a known type need to be made with rather thick layers of insulating expanded material in order to avoid a rapid loss of heat towards the outside.
DISCLOSURE OF INVENTION
The aim of the present invention is to overcome the drawbacks of the prior art technique, providing a water heater wherein the structural characteristics of the two semi-shells and the relevant joining method, as well as the materials they are made of, contribute to obtain characteristics of high mechanical resistance and reliability in time also whenever high pressures arc present.
Another aim of the present invention is to build a water heater that does not need a supplementary insulating layer besides the shells.
A further aim of the present invention is to build a water heater that can be easily recycled and whose components are made of highly compatible plastic materials.
A still further aim of the present invention is to produce a water heater which is easy and cheap to build.
In order to achieve the aforementioned aim, the invention relates to a water heater of the type mentioned in the preamble of the present description, bearing the features illustrated in the following claims.
REFERENCES:
patent: 4865014 (1989-09-01), Nelson
patent: 4982856 (1991-01-01), Stokes
patent: 5167344 (1992-12-01), Van Schilt
patent: 5668922 (1997-09-01), Ross et al.
Campbell Thor
Merloni Termosanitari S.p.A.
Vigil Thomas R.
Walberg Teresa
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