US 5,138,693 AGranted

Electric fluid heater with thermosphonic fluid circulation

AssigneeE.G.O. Elektro-Gerate Blanc u. Fischer

InventorHermann Knauss

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Abstract

A fluid heater having a fluid chamber with a base wall and an upright sidewall is positioned above a feed chamber having an upper wall. A plurality of identical tubular passage heaters, each having an upper outlet end connected to the fluid chamber base wall and an inlet end connected to the upper wall of the feed chamber, are disposed in at least one lateral protective niche recessed with respect to the fluid chamber upright wall. Return ducts located inwardly of the passage heaters connect the base wall of the fluid chambers to the upper wall of the feed chamber. Thermostatically controlled electric heating elements helically disposed on the passage heaters produce a thermosphonic circulation of fluid from the feed chamber through the passage heaters to the fluid chamber and back to the feed chamber through the return ducts. The heating capacity of the fluid heater can be varied within wide limits by energizing different numbers of passage heaters. The passage heaters are removable to allow thorough cleaning of the fluid heater, which may be used as a deep fryer, water heater, or the like.

Claims35

Dependent claims

In combination with a fluid chamber having a base wall and an upright outer sidewall, said upright outer sidewall defining a width extension and a height extension of said fluid chamber, a fluid heater comprising:

at least one tubular passage heater, each having an upper outlet opening issuing into said fluid chamber, and defining a heat flow passage for heating fluid flowing therethrough;
at least one return duct disposed in a flow path connecting said fluid chamber to a lower inlet opening of each heated flow passage defined by the at least one tubular passage heater, said flow path including a feed chamber disposed below said base wall of said fluid chamber;
said base wall connected to an upper end of at least one said at least one passage heater;
and,
an upper wall of said feed chamber being connected to a lower inlet end of each of said at least one passage heater, wherein each of said at least one passage heater is disposed in at least one lateral outer niche laterally recessed with respect to said upright outer sidewall of said fluid chamber, said base wall of said fluid chamber defining a top boundary of said at least one niche and said upper wall of said feed chamber defining a bottom boundary of said at least one niche,
the feed chamber being widened with respect to said at least one return duct and with respect to said at least one tubular passage heater, said at least one return duct connecting said fluid chamber with each said inlet opening via said feed chamber.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/453,006Filed 18 Dec 1989 · continuation
Priority: DE 361023526 Mar 1986
Granted: 11 Aug 1992
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

A47J 37/1233
Deep fat fryers, e.g. for frying fish or chips: the frying liquid being heated outside the frying vessel, e.g. by pumping it through a heat exchanger
A47J 27/024
With enlarged heating surfaces: with liquid-heating tubes extending outside the vessel
F22B 1/282
In boilers heated electrically: with water or steam circulating in tubes or ducts
F24H 1/185
Water-storage heaters: using electric energy supply