Electric resistance heating devices – Heating devices – Continuous flow type fluid heater
Reexamination Certificate
1999-12-29
2001-12-11
Walberg, Teresa (Department: 3742)
Electric resistance heating devices
Heating devices
Continuous flow type fluid heater
C392S484000
Reexamination Certificate
active
06330395
ABSTRACT:
BACKGROUND OF THE INVENTION
1) Field of the Invention
The present invention relates to a heating apparatus with safety sealing, particular to a heating apparatus, which uses fluid to conduct thermal energy and has safety sealing.
2) Description of the Prior Art
The conventional fluid type heating apparatus generally comprises a heating means with an electrothermal metal enclosed by insulating envelope and immersed into a fluid. The heat generated by the heating means is conducted through the fluid the outer case of the fluid type heating apparatus or transmitted to body directly heat exchange with the fluid. However, the fluid used for the fluid type heating apparatus is required to accumulation or circulation for specific application, the overall machine size is bulky. Moreover, the temperature distribution may be nonuniform when the fluid is not uniformly circulated. The electrothermal metal used in the heating means has high temperature about 500° C., the insulating envelope made of material such as mica is liable to crack and short-circuit problem may occur.
SUMMARY OF THE INVENTION
The present invention is intended to overcome above problems. In one aspect of the present invention, the inventive fluid type heating apparatus with safety sealing comprises a metallic heat exchanging main body, a heating means embedded within the metallic heat exchanging main body, a plurality of fluid conduits extended along the lengthwise direction of the metallic heat exchanging main body, a groove at the center of the metallic heat exchanging main body and housing the heating means enclosed by an insulating layer, a front cover at front side of the metallic heat exchanging main body and a rear cover at rear side of the metallic heat exchanging main body. The front and rear cover has a plurality of guiding slots coupled to the conduit to control circulation of the fluid.
In another aspect of the present invention, the conduit is integrally formed by a serpentine shape tube to reduce fluid resistance.
In still another aspect of the present invention, the metallic heat exchanging main body has two deformable parts on lateral sides thereof such that the heating means can be firmly retained.
In still another aspect of the present invention, the metallic heat exchanging main body has thread groove to facilitate the disassembling thereof.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:
REFERENCES:
patent: 3782456 (1974-01-01), Gusmer
patent: 4255646 (1981-03-01), Dragoy et al.
patent: 4334141 (1982-06-01), Roller et al.
patent: 4371777 (1983-02-01), Roller et al.
patent: 5724478 (1998-03-01), Thweatt
Campbell Thor
Dougherty & Troxell
Walberg Teresa
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