HU190518B - Cooking kettle particulary cooking on a large scale - Google Patents

Abstract

The invention relates to a cooking vessel which can be heated using fossil fuel, in particular for use in large kitchens, in which the shell containing the filling is surrounded by a duplicator which is filled up to a predetermined level with easily evaporating liquid, advantageously water. The heat-receiving surface of the duplicator on the heating space side is enlarged by a heat exchanger fitted with heating tubes. The degree of efficiency in respect of the energy consumption of the cooking vessel is improved to a significant extent by the invention. The design is compatible with that of electrically heated and steam-heated vessels, thus also providing the possibility of simultaneous use of different types of fuel.

Description

The subject-matter of the application is a cooking pan, mainly for use in commercial kitchens (eg catering, catering, hospital, food, etc.), whose cup containing a useful filling is sealed with a highly volatile liquid, preferably water, up to a certain level. surrounded by a duplicator.

In the catering sector and the food industry, the various cooking operations play an important role, most of which are carried out in cooking pans. In order to shorten the heating and cooking time, the appliances use a relatively high energy density, which can easily cause the food to burn.

To prevent this, the cup containing the useful charge is filled with a liquid which is easily evaporated to a certain level, usually with water. it is surrounded by a duplicator and the heating is performed by electric heaters located in the duplicator compartment or by steam or hot water introduced into the duplicator compartment. The resulting cooking pans, when heated with gas or other fossil fuels, operate at a lower efficiency and the heating time is significantly increased, since the heat-absorbing surface and heat transfer coefficient of the burner side are significantly lower than necessary. However, in many places it would be preferable to use e.g. a low-cost natural gas cooking boiler.

Until now, boilers have been used for this purpose, which, in order to achieve the efficiency specified in the standards, are designed so that the burner-side heat-absorbing surface of the heat exchanger providing the heat exchanger between the firebox and the duplicator space is maximized.

This was accomplished primarily by ribbing the outer wall of the duplicator. The ribs were different in size for each cauldron, the cauldron became heavy, and due to the finite heat transfer of the ribs, the heat exchange did not reach the desired value.

SUMMARY OF THE INVENTION The object of the present invention is to use a series of well-designed cauldron designs for electric and steam heating for fossil burners (such as gas, oil, coal, etc.), and to increase the energy efficiency of such devices.

The cooking pan of the present invention is based on the recognition that the heat conductivity of the heat exchanger used in the heat exchanger between the furnace space and the duplicator space is several orders of magnitude greater than that of known materials; the duplicator can also be located outside the wall.

The object of the present invention has been achieved by placing a heat exchanger in a closed duplicator space enclosed by an outer jacket and cup wall, while the outer heat receiving surface is located in the trough, flue gas passage of the fossil fueled device or both.

In a preferred embodiment of the cooking pan according to the invention, the duplicator consists of heat exchanger elements extending into the space and which can be mounted independently of one another. In another embodiment, the heat-absorbing surface of the heat exchanger of the tubular heat exchanger is provided with heat-collecting ribs, which can also be used to direct the combustion products.

The heat-absorbing surface thus formed reduces the temperature of the combustion products to such an extent that only a significant part of the heat energy contained therein is discharged with the combustion product.

The design of the heat exchanger described above allows for the addition of electric heaters to the duplicator space adjacent to the heat exchanger elements, thereby allowing the two heating modes to be used alternatively, i.e. independently of each other.

BRIEF DESCRIPTION OF THE DRAWINGS The construction and operation of the cooking kettle of the present invention will be described in more detail with reference to some embodiments. 1 is a vertical sectional view of a schematic diagram of the construction of a cooking kettle according to the invention in FIG. The heat receiving surfaces 4 of the duplicator 2 surrounding the cup 1 containing the useful charge 1 extend into the firebox 6 and / or into the burner 5. As shown in the figure, the heat transfer surface 10 of the duplicator 2 is significantly increased by the heat-absorbing surface 4 of the heat exchangers 3 by a suitable design of the heat exchanger 3. Fig. 1 shows horizontally, Fig. 2 shows vertically located heat exchangers 3, however, any design is conceivable.

Fig. 3 shows another advantageous embodiment of the cooking pan shown in Fig. 1, wherein the heat-absorbing surface 4 of the heat exchangers 3 is increased to the extent required by the heat-collecting surface 11. The heat collecting surfaces 11 may also serve to deflect the combustion products of the burner 5.

Fig. 4 shows a variant in which the liquid 9 in the duplicator space contains, besides the heat exchanger in the duplicator, the electric and / or steam heating radiators 12.

It will be seen from the foregoing that the cooking pan described herein is suitable for providing adequate efficiency in heating with fossil fuels, and has the appropriate or preferred means for providing the same. with the advantageous properties of steam boilers (eg short heating times), without the need for a separate boiler construction. The heat exchanger elements provide quick and easy repair and assembly, construction is simpler and easier, and there is also the possibility of firing in combination with electric and / or steam heating.

Claims (6)

PATENT CLAIMS A cooking pan, particularly for use in the kitchen, wherein a cup containing a useful charge is surrounded to a certain extent by a duplicator filled with a highly volatile liquid, preferably water, characterized in that the heat exchanger extends into a confined space between the duplicator (2) and the wall of the cup. (3) having an external heat-absorbing surface (4) located in the firebox (6) and / or in the flue duct (7) of the fossil fuel operated device. Cooking pan according to claim 1, characterized in that the outer heat-absorbing surface (4) of the heat exchanger (3) extending into the space is provided with heat-collecting ribs (11). Cooking kettle according to claim 1 or 2, characterized in that the duplicator (2) consists of heat exchanger elements (3) which extend into the liquid (9) contained in the space. 190,518 4. Aj. 1-3. Cooking kettle according to any one of claims 1 to 3, characterized in that the elements of the heat exchanger (3) are interchangeable independently. 5. Boiler according to any one of claims 1 to 3, characterized in that the snow collector ribs (II) of the heat exchangers (3) located in the flue gas duct (7) also serve to direct the combustion products. 6. A cooking kettle according to any one of claims 1 to 5, characterized in that electric and / or steam heaters (12) are disposed adjacent to the heat exchangers (3) extending into the liquid (9) of the duplicator and the two heating modes can be used alternatively or together.