DE2627491A1 - Flat immersion heating element with sinusoidal channel - in contact with colder water only to increase heating output - Google Patents

Abstract

Immersion heating element for boiler comprises a flat body with a meandering extending channel (3) for flow of a heating medium. The element may be dish-shaped, and consist of two plates (2', 2") which are inserted one in the other and connected at their edges by welding. The plate facing the boiler shell is curved with uniform curvature, and the other one has an indentation (2A) forming with the first plate a meandering extending channel. The element is pref. rigidly connected to the boiler in the region of the flow and return pipe, and performs movement relative to the boiler in the remaining region. The element is manufactured by welding the two plates together at their edges, then rolling them to produce stress which biasses the indented walls of the second plate against the first plate.

Description

Heating insert for domestic water boiler The invention relates to a heating insert for domestic water boilers, especially those in a horizontal version, which by its special structural design a significantly higher heating power than conventional constructions with the same heating surface.

The use of double jacket boilers is for domestic water preparation became known, with which hot water or with older systems steam around the service water column passed around through a cavity formed from two nested chucks will. The heating medium heats both the cold and the already warmed up Domestic hot water, which means that the heat output per unit area fluctuates greatly.

Another problem with these systems is caused by the property of the Heating medium, find the shortest path between the inlet and drainage line to search. Taking this into account, the proposal has already been made, to lead the hot water through a helical channel, which through wave-like Embossing of one of the two boiler shells or by means of appropriately bent pipes a heating element body was formed. This construction did not produce a satisfactory one either Solution and was with the lack of the vastly different heat dissipation per unit area afflicted.

In order to eliminate the stated disadvantages of the known constructions and to achieve the goal set at the beginning, an intervention is proposed, which according to the invention consists of a flat body with a meandering body therein There is a channel for the heating medium to flow through.

The heating insert is advantageously designed like a shell, so that when the boiler is lying down, the curvature of the jacket is at a small distance can follow from its bottom turning point.

Since the inflowing cold water is characterized by its higher specific Weight in the lower lying area of the boiler accumulates, while that is specific lighter hot water rises in the boiler and through the internal circulation on the the desired temperature is maintained, the heating element is only available with the colder one Layers of the domestic water in contact and can therefore have a significantly higher heating capacity than the known constructions, in which the heating insert also the higher lying, already warmed layers of laser heat, where by the rilgerte Temperature difference between heating water and preheated service water the heat transfer is naturally lower.

In addition, the thermostat can limit the temperature of the domestic water be placed lower, which makes the temperature control more accurate and overheating can be better avoided.

Further details of the invention are based on the drawing Boiler explains in which an Ausfülirungsbeispiel a boiler with the invention Heating insert is shown. There show Fig. 1 the boiler with longitudinally cut Jacket and heating insert in side view, Fig. 2 is a section along the line II-II 1, 3, the boiler with a cross-sectional jacket and heating insert in plan view and FIG. 4 shows a section along the line IV-IV of FIG. 3 on a larger scale.

The boiler marked 1 is installed horizontally and points into areas its lower end point at a distance from this a flat switch-shaped Heating insert 2, which follows the curvature of the boiler jacket. The heating insert consists of two sheet metal plates 2 ', 2 "of which the bottom 2' is flat and the cover-side 2 "has a meandering embossing, which with the sheet metal plate 2 'a meandering pocket 3 or a meandering channel for which forms the i-iediuii flowing through the heating element 2. U1n a density between To achieve the adjacent trains of the pockets, both panels can be pre-rolled or flat state, in which latter case only the plate 2 ″ is the meander-like Has embossing, first welded at the edge and then rolled, whereby a tension arises between the plates, which causes the between the trains embossed corrugations 2A of the upper plate lie tightly on the lower plate. When using pre-rolled sheets, it is possible to either use both sheets to roll forward with the same or different radius of curvature, in the latter case Fall the top plate 2 "more than the bottom plate 2 'is rolled.

The heating insert 2 is connected to a flow line 4 and a return line 5 and the boiler 1 on its cover 6 to a cold water inlet £ 7 and a hot water drain 8 connected. Here, the flow line 4 connects to the cold water inlet 7 turned away and the return line 5 to the end of the pocket 3 facing it.

The heating insert 2 is located near the two ends by means of pairs of tabs 9 or 10 connected to the boiler jacket arranged at a distance therefrom, wherein that of the connection-side cover or the water inlet and outlet end of the Boiler 1 closer pair of tabs 9 forms a rigid connection, while the other pair of tabs a relative movement of the heating insert in the longitudinal direction of the Boilers allows.

Claims (6)

Patent claims: Ö Heating insert for domestic water boiler, characterized in that it consists of a flat body with a meandering channel (3) For the heating medium to flow through. 2. Heating insert according to claim 1, characterized in that it is shell shape owns. 3. Heating insert according to claims 1 and 2, characterized in that that he consists of two nested, edge z. B. connected by welding curved plates (2 ', 2 "), of which the boiler jacket facing is just curved and the one facing away from it has an imprint, which with the just curved plate a meandering pocket or iron meander-shaped extending channel (3) forms. 4. Heating insert according to claim 1, characterized in that it is in The area of the flow and return pipes is strongly connected to the boiler (1), in the remaining area, however, relative movements to the boiler (1) can be carried out. 5. A method for producing the heating insert according to the claims 2 and 3, characterized in that the plate provided with the embossing with the smooth plate is welded together at the edge, whereupon the two the meander-like Channel enclosing panels are rolled in the connected state, so that between two plates create a tension through which the embossed walls of the surface channels own plate to be pressed tightly against the smooth plate. 6. The method according to claim 5, characterized in that the plates be pre-rolled before welding.