SU51446A1 - Heating element - Google Patents

Description

The proposed heater element is intended to warm the air for both ventilation and drying purposes.

In currently existing heaters, heat is transferred to air through sheet iron plates, which are soldered (welded) to tubes or slit-like chambers through which coolant is passed (steam or hot water).

In the proposed heater, the plates are completely absent. Heat transfer is carried out through you stamped into sheet metal, at some distance from the sheet edges, thinned corrugated surfaces, as if through hollow ribs.

In FIG. 1 shows a partial section of a heater element; FIG. 2 perspective view of it; FIG. 3-cross-section of the corrugated part of it.

In a sheet iron of the corresponding sizes, two groups of fins 7 are stamped out (Fig. 2), the sheet is bent in the middle part and welded with its ends 3. A closed element is obtained. A number of such elements, with their open sides, are welded into a frame 4 of sheet metal, in which the corresponding holes 5 are extruded.

The corrugated elements can be arranged against each other, either by the edges of the ribs, as indicated in the drawing, or they can be shifted so that the vertex of one edge is located opposite the depression of the adjacent pair of edges.

It is more advisable to install the elements of the heater close to one another with rounded edges. The outer elements are enclosed with sheet iron.

With this method of installation of elements, the possibility of their bulging is completely excluded even in the event of an excessive increase in pressure of the heat transfer fluid, which during normal operation is in the range of 0.5-3.0 atm.

Wavy surfaces are not obtained by through sheet corrugation, but by hot extrusion of this corrugation at some distance from the edges of the sheet so that the edges of the sheet around the corrugated edge

stampings remain smooth and untouched (Fig. 2).

During punching it turns out

metal stretching, and its thickness on the walls of the corrugation is reduced by about two times. Only the edges of the sheet and the rib-tops of the corrugations maintain the thickness of the base metal sheet (Fig. 3). The frames are overlapped with covers 6 on clinker gaskets 7 and tightened with bolts 8 or welded.

The corrugation system gives the heater element greater rigidity and

Good resistance to internal coolant pressure.

Depending on this pressure

The elements may be made from soft sheet steel with a thickness of from 1.5 to 2.5 mm.

The overall dimensions of the heater can be different, depending on the required heating surface.

In this construction, due to the direct contact of the air with the surface of the heated element (without the intermediation of plates), an increase in the heat transfer coefficient is reached, approximately by

200%, due to which the overall dimensions of the heaters can be significantly reduced.

Considering that the resistance to the passage of air in the proposed heater is 2-3 times less than in the plate heater of existing types, the compactness of this heater does not entail an increase in its resistance.

On the line with the thermo-hydrodynamic qualities of this design, it is also necessary to note the absence of the use of gas pipes and non-ferrous metals in it for soldering plates to pipes.

The subject matter of the invention.

An air element stamped from a sheet and provided with corrugations, characterized in that pyramidal corrugations are located at some distance from the edges of the sheet, in order to obtain thinned, compared to the corrugation-free part, the walls of the corrugations and the increased thickness of these walls on the tops of the corrugations.

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