Fluid heater

Details Fluid heater Fluid heater

1998-10-02

2001-03-20

Walberg, Teresa (Department: 3742)

Electric resistance heating devices

Heating devices

Continuous flow type fluid heater

C392S465000, C392S498000

Reexamination Certificate

active

06205292

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a fluid heater including a pipe through which a fluid flows.
It is known to heat liquid and gasses in order to vaporize them or to pressurize them. The known devices, however, have a slow response time. It takes a relatively long time to heat the fluid to be heated after switching on the heater, and after switching off the heater heating of the fluid is not immediately ended.
From German Patent Application 44 20 493 a fluid heater of the aforementioned kind is known in which the heating elements are electric resistance bands applied to the outer circumference of the fluid pipe. Due to the indirect heating of the fluid through the pipe wall, a fast switching on and off of the heater without delay of the heating action and of the shutdown of the heating action for the fluid is not possible.
From the documents German Gebrauchsmuster 19 06 191, German Gebrauchsmuster 89 13 683, German Patent 38 41 448 and German published document 12 69 748, heating elements and radiant heaters are known which, however, are not designed for heating a fluid flowing through a pipe and are also not suitable for this purpose.
The object of the present invention is to provide a fluid heater which can be manufactured inexpensively and which provides for a fast switching on and switching off of the heater.
SUMMARY OF THE INVENTION
The inventive object is solved by a fluid heater such that the pipe is arranged concentrically about a radiant heater enclosed by a quartz mantle.
A special advantage of the present invention is that the quartz mantle only retains minimal heat so that directly after switching off the fluid heater the fluid is no longer being heated.
According to a preferred embodiment of the invention, the quartz mantle is a quartz tube that contains the radiant heater in the form of an electrical heating element. Preferably, at least a section of the quartz tube contains a heating wire. When a plurality of sections of the quartz tube contain a heating element, switching together of multiple heating elements provides an increased heating output.
According to a further preferred embodiment of the invention, a safety temperature sensor is provided at a section of the outer circumference of the fluid pipe positioned opposite of the section of the quartz tube. Preferably, the heating current flowing through the heating wire is switched off when the safety temperature sensor measures a temperature surpassing a predetermined temperature value. The temperature value provided by the safety temperature sensor furthermore shows whether gas flows through the fluid pipe because in this case the heating energy is transported by the fluid medium to the section of the outer circumference of the fluid pipe
According to a further preferred embodiment of the invention, a second temperature sensor is provided at the outlet of the fluid pipe. Advantageously, the temperature value determined by the second temperature sensor is used for controlling the heating output.
Advantageously, the radiant heater is an infrared heater and the fluid pipe consists of stainless steel, a ceramic pipe, or a steel pipe that is lined with a ceramic material or a ceramic tube. With this embodiment, a large portion of the emitted heat energy coming from the radiant heater is reflected at the inner circumference of the fluid pipe into the fluid pipe.


REFERENCES:
patent: 3906188 (1975-09-01), Gamell
patent: 5054107 (1991-10-01), Batchelder
patent: 5054108 (1991-10-01), Gustin et al.
patent: 5271086 (1993-12-01), Kamiyama et al.
patent: 5371830 (1994-12-01), Wachenheim
patent: 5408578 (1995-04-01), Bolivar
patent: 5740315 (1998-04-01), Onishi et al.
patent: 5872890 (1999-02-01), LaCombe
patent: 1269748 (1959-08-01), None
patent: 8913683 (1990-02-01), None
patent: 3841448 (1990-05-01), None
patent: 4420493 (1995-12-01), None
patent: 0570586 (1993-11-01), None
patent: 61116246 (1984-11-01), None
patent: 01200143 (1988-02-01), None
“Infrarot-Strahlen-Heizung”; 1964; pp. 2-8; Herbert Keller.

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