Heat exchanger

Liquid heaters and vaporizers – Stand boiler – Fluid fuel burner

Patent

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Details

165156, F28D 712

Patent

active

059838418

DESCRIPTION:

BRIEF SUMMARY
The present invention pertains to a pot-shaped heat exchanger with a front-side connection to a burner or the like for accommodating a burner flame tube, a lateral water inlet in the bottom of the pot and a water outlet in the area of the front-side connection, wherein water flows through both the bottom of the pot and the jacket of the pot.
An above-mentioned, prior-art heat exchanger has, on the underside in the area of the bottom of the pot, a lateral water inlet, into which the water outlet pipe branch of a water pump arranged under the heat exchanger is introduced in a sealed manner to feed the heat exchanger medium in the form of water to both the bottom of the pot and to the jacket of the pot during the operation of the arrangement. The jacket of the pot has a helical water guide to pass the water helically practically over the entire surface of the jacket of the pot before the heated water is removed to the burner for a user at the end of the helix in the area of the front-side connection of the heat exchanger. Even though the water fed in does circulate in the area of the jacket of the pot of the heat exchanger, it does not circulate in the area of the bottom of the pot. A burner flame tube extending into the interior of the pot-shaped heat exchanger may consequently overheat the bottom of the pot, especially at high heat output at a high water outlet temperature close to the boiling point. Local overheated areas of the bottom of the pot lead to the formation of vapor bubbles, which compromise the efficiency of the heat exchanger. In addition, the overheated areas of the bottom of the pot are exposed to an increased stress on the material, which compromises the service life of the heat exchanger.
Based on the above-mentioned state of the art, the object of the present invention is to provide a heat exchanger of the above-described type, which has a simple design and can be operated highly efficiently and makes possible, in particular, a high heat output with a high water outlet temperature.
The basic object of the present invention is accomplished by a heat exchanger of the type described in patent claim 1.
The subject of the present invention is advantageously improved by the features of patent claims 2 through 18.
The essence of the present invention is that water guide sections are provided in the bottom of the pot of the heat exchanger for a directed, essentially surface-covering flow of water in the bottom of the pot.
In the area joining the lateral water inlet, the bottom of the pot has, in particular, at least two water guide channels for a circulating flow of water in the bottom of the pot, which channels have a sickle-shaped top view.
In one variant of the embodiment of the present invention, the water guide channels may be formed by a separate guide plate insert in the bottom of the pot, wherein the guide plates in the bottom of the pot have a sickle-shaped top view and the root of the sickle is located in the area of the lateral water inlet.
In an especially advantageous variant of the embodiment of the present invention, the bottom of the pot has, however, sickle-shaped water guide channels in the form of integrated depressions, wherein the root of the sickle is located in the area of the lateral water inlet.
The radially outermost, sickle-shaped water guide channel preferably has the smallest flow cross section of all water guide channels of the arrangement, wherein the width of this radially outermost water guide channel is maintained at a largely constant value along the sickle.
Radially inwardly located water guide channels preferably have, in contrast, a larger flow cross section, which increases in the direction of the center of the bottom of the pot in the individual water guide channels.
A sickle-shaped water guide channel located radially on the inside preferably extends through the axial center of the heat exchanger or through the center of the bottom of the pot of the heat exchanger.
In an advantageous variant of the present invention, sickle-shaped water guide channels loca

REFERENCES:
patent: 3468371 (1969-09-01), Menze
patent: 3730229 (1973-05-01), D'Onofrio
patent: 4479484 (1984-10-01), Davis
patent: 4588659 (1986-05-01), Abens et al.
patent: 5372185 (1994-12-01), Lannes
patent: 5537955 (1996-07-01), Wu

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