Liquid heaters and vaporizers – Subsidiary
Patent
1990-08-02
1991-10-01
Favors, Edward G.
Liquid heaters and vaporizers
Subsidiary
122 7R, F22B 3300
Patent
active
050523457
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to heating apparatus, preferably such as are oil-fired, which include a heat exhanger, and which are intended for supplementing or replacing conventional heating installations, e.g. for small house boilers and the like.
As a result of increases in the price of oil, and since oil is occasionally a commodity difficult to obtain, it has become more and more desirable to obtain effective installations for heating purposes which are economical with regard to fuel and which also have a low price. This invention is described, per se, in connection with problems concerning one-family houses, but one skilled in the art will understand that the invention has many conceivable applications and is thus not restricted to this field.
There are oil-fired heat exchangers provided with equipment such that the flue gases can give their heat content to the fluid which is to be heated and which conveys the heat to such as radiators in a building. In certain cases, there is thus a pre-heater placed in the flue gas passage for also pre-heating the fluid which distributes the heat. However, this is not a particularly good solution if it is taken into consideration that the flue gases contain substances, which can condense and form coke-like deposits as well as forming corrosive substances which can put great requirements on the material in the heat exchanger and flue gas passage. In addition, such installations will be voluminous.
A desire is therefore to achieve a combustion-driven heat exchanger, in which the heat in the flue gases is recovered to a certain extent and used for heating purposes. Another desire is to achieve a compact and cheap unit, which can easily be connected into the system as required.
The present invention has the object of providing a combustion-driven heat exchanger while mitigating the above-mentioned problems, and which satisfies the mentioned desires. This object is achieved by a structure of the kind disclosed in the claims, which also disclose what is characteristic for the invention.
The invention will now be described in more detail in the following in connection with the accompanying drawings, where
FIG. 1 is a schematic cross section through a heat exchanger included in a heating apparatus in accordance with the invention, and
FIG. 2 is a longitudinal section through the heat exchanger of FIG. 1.
The heat exchanger 1, schematically illustrated in the Figures, is generally tubular in shape, and comprises an exterior shell 2, surrounded by an insulating casing 3, inside of which there is a through-going tube 4, which defines a circular chamber 5 for the primary fluid, i.e. the heating fluid, where the shell 2 constitutes the outer wall and the tube 4 the inner wall, walls 6 and 7 closing off the chamber 5 axially, while the interior of the tube 4 forms a passage 8 for exhaust gases from a burner. The passage 8 is provided with an inlet 9 and an outlet 10, both of which have a lesser diameter than the tube 4 for giving the exhaust gases a decreasing volocity in the through passage 8 compared with that in the inlet 9 and outlet 10.
A pipe 11 for conducting secondary fluid, i.e. the fluid which is to be heated, extends helically through the chamber 5 round the tube 4 and through the tube 4 to the passage 8 for flue gases, where the pipe 11 is extended in several loops going backwards and forwards in the longitudinal direction of the passage 8. An expansion tank 12 is connected to the chamber 5 and is provided with a safety valve 13 for preventing an explosion in the heat exchanger in the case of overheating, the tank also being provided with a venting valve 14.
All fluid connections are placed in the same end wall 7. The connection 15 for incoming primary fluid is arranged at the bottom of the chamber 5 and extends almost up to the opposite end wall 6, where the fluid heated by the burner flows into the chamber 5, and is kept in circulation with the aid of a pump associated with the burner and similarly unillustrated. At the upper part of the chamber, there is an outlet
REFERENCES:
patent: 2320532 (1943-06-01), Munsters et al.
patent: 4251028 (1981-02-01), Hizulai et al.
patent: 4275687 (1981-06-01), Sasaki
patent: 4318366 (1982-03-01), Tompkins
patent: 4373473 (1983-02-01), Grandmont
Bystrom Kurt
Johansson Lars E.
Bystrom Kurt
Favors Edward G.
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