CS252962B1 - A method of producing a double-shell heat exchanger formed by hollow shells - Google Patents

Abstract

A method for producing a double-shell heat exchanger in which an outer shell is slid onto the inner shell. Radial and shaping segments of the tool on the inner casing are shaped so that one technological operation will permanently bulge the outer casing and mold the two circumferential overlays to firmly connect to the outer casing at the crest and close a cavity between the two shells.

Description

The present invention relates to a method for producing a heat exchanger comprising two hollow shells slid together on one technological operation.

At present, the technology of heat exchanger production, which consists of two hollow shells, is provided for several operations. In one operation, both ends of the outer sheath are bent and the next outer sheath is slid onto the inner sheath. In a further operation, the bent ends of the outer sheath are pressed against the periphery of the inner sheath, thereby forming a closed cavity therebetween for the flow of the heating or sheathing. heated medium. This method of manufacturing the heat exchangers is laborious, it does not allow to create a suitable labyrinth of obstacles for the directed flow of the medium, it does not guarantee uniform and perfect pressing of the bent ends of the outer casing on the circumference of the inner casing. These disadvantages cause further problems in circumferential welding of both sheaths, especially in automated welding technology, where, due to the uneven pressing of the outer circumference to the inner sheath circumference, the root of the weld is burnt or not boiled. Due to the imperfection of this production technology, the heat exchangers produced in this way have a lower quality, lower functional and operational properties and thus a lower technical level.

The above-mentioned disadvantages are centered on the production method according to the invention, characterized in that the inner and outer sheaths are loosely slid onto the clamped tool, both sheaths being oriented in the desired height and circumferential position relative to the tools. The radially-acting mold segments of the tool on the inner sheath are shaped such that in one operation the inner sheath is permanently bulged and two peripheral recesses are pressed, thereby firmly bonding to the outer sheath at the recesses and closing the cavity between the two sheaths. The crimping is determined by the shape of the tool segments, the shape of which can be adapted to regulate the flow of the heating or heating elements. heated medium. This technology

Claims (4)

SUBJECT Method for producing a heat exchanger consisting of two hollow shells of different circuits per operation, characterized in that the inner sheath (1) inserted into the outer sheath (2) is subjected to a radial deformation force which causes a permanent swelling of the inner sheath (1) and Measuring the cavity between the inner and outer sheaths for one operation is new and makes it possible to create a perfectly enclosed space for media flow. This method of production will ensure a significant reduction of laboriousness, increase of the technical level of the exchanger and its functional and operational properties max. using heat exchange surface. At the same time, it is possible to use high-performance and high-quality automated welding of both tires. The accompanying drawings show the process and method of radially shaping and joining two hollow shells of different circumferences. Fig. no. 1 shows the inner shell blank with the outer shell blank loosely inserted prior to radial shaping; FIG. 2 shows the cavity between the shells after radial shaping, FIG. 3 shows a detail of the jacket connection, FIG. 4a is an elevational view of an example of joining and shaping; and FIG. 4b. Fig. no. 3 shows a detail of the connection of the inner shell 1 and the outer shell 2, where the d-shaped inner shell 1 blank is prior to shaping and which, after being reshaped to a definite shape, has the dimensions D, D 1, D 2. The dimension D3 is the dimension of the outer casing blank 2. The dimensions D4 and Ds are finally the dimensions of the outer casing 2 after molding. The values of the dimensions of the starting blanks and the final dimension after radial shaping are selected so as to achieve permanent deformation of the material from which the jacket blanks 1 and 2 are made, which results in the compression of the two blades on each other. In FIG. 4 shows an example of the method of radially shaping two skins, where the radially shifting shaping segments 3 shape and press the inner sheath 1 onto the outer sheath 2. The direction of action of the shaping segments 3 is indicated by arrows in plan view. . The forming operation is generally carried out cold. However, it can also be done with a semi-heated blank or hot. THEREFORE, the invention is to be pressed onto the outer sheath (2), thereby forming a cavity between the inner sheath (1) and the outer sheath (2) for the flow of the heating or heating means. of the heated medium, this operation can be carried out either cold or with semi-heating of the blank, or hot.