SU1648717A1 - Method of manufacturing heat exchanger - Google Patents

Abstract

The invention relates to the processing of metals by pressure and welding, and b. used to make helical finned heat exchangers and tubes. The purpose of the invention is to simplify the manufacturing technology. A method of manufacturing a heat exchanger involves forming individual helical coils with their subsequent rigid connection. Forming individual helical spirals is carried out by winding a strip on the mandrel turn to the turn of the disc-shaped form. After forming, the helical spirals are calibrated in a step. Before the rigid coupling, the spiral is wrapped into a spiral on a cylindrical mandrel. The calibration step corresponds to the size of the half of the conditional line connecting the components of the individual helical spirals. The helix is screwed into a spiral mandrel with a conical profile of turns, followed by fixing the turns of the spirals in a radial position. 4 yl

Description

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The invention relates to the processing of metals by pressure and welding and can be used for the manufacture of spiral finned heat exchangers and tubes.

The purpose of the invention is to simplify the manufacturing technology

Figure 1 shows an embodiment of a heat exchanger, a section; in Figure 2, a device for forming helical spirals; in FIG. 3, view A in FIG. 2: in FIG. 4, a variant of fixing the spirals in the radial position.

The heat exchanger consists of spirals 1 and 2 with turns of a dish-shaped form, welded oppositely inclined to each other, of equal pitch of the inner and outer diameter. The winding pitch is made in such a way that when laying the spirals 1 and 2, the coils are pressed against each other and form a corrugated helical surface. The inlet and outlet parts of the screw surface are connected by nozzles 3 and conical caps 4. Spirals 1 and 2, nozzles 3 and caps 4 are tightly interconnected by welding, for example, electric arc

The heat exchanger is made as follows.

The coils of coils 1 and 2 are wound in a device (FIGS. 2 and 3), which impart a plate-like form during winding. Together with the sleeve 6, the mandrel 7 rotates from the drive in the direction shown by the arrow. The sleeve 6 supports the strip, the end of which is in the form The coaxial cone with the mandrel and the sleeve 6 houses two disks 8 and 9, between which a gap is set depending on the thickness of the strip 5 due to the axial movement of the disk 8 along the mandrel 7.

The disk 8 contains a roller 10, the axis of which freely rotates around its axis and is rigidly fixed on the disk 8. The roller 10 creates a radial force on the strip 5 in the direction of the mandrel 7 during the molding process.

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loses The disk 9 has a conical surface in the molding zone and is provided with a screw groove 11 for exiting the molded helical spiral 5 from the molding zone. The mandrel 7 is provided with an element 12 for fixing the beginning of the strip 5. In addition to the rotational movement, the mandrel .10 has axial movement along its axis due to the keyway 13. As the turns of the shaped strip exit through the helical groove 11 from the forming zone, the mandrel 7 moves out of the sleeve b on the thickness of the strip 5.

The winding strip is removed from the mandrel 7 and the spiral is calibrated in a step. The calibration step corresponds to the size of the half of the conditional line a (Fig. 1) connecting the components of the individual helical spirals 1 and 2 at points b and c.

After calibration, the helix is cut to the required length and assembled. When this spiral 2 is set manually on a cylindrical mandrel, and the spiral 1 is rotated 180 ° relative to the spiral 2 and wrapped in it.

To increase the accuracy of assembly, the twisting of the spiral 1 into the spiral 2 is made on a screw mandrel 14 (Fig. 4) with a conical profile of the turns 15, followed by fixing the turns of the spirals in a radial position using a fixed stop 16 and a rod 17 of the pneumatic cylinder, which moves the screw mandrel 14 in the axial position. In this case, the helical spirals 1 and 2 are securely fixed in the radial position on the turns 15.

It should be noted that bronze can serve as the material for the manufacture of the screw mandrel 14.

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On the mandrel 15, in a fixed position, welding is performed, for example, electric arc along the protrusions and troughs of the helical spirals. A corrugated helical surface is obtained.

After that, the welded pipes 3 and cover 4.

The proposed method significantly reduces the production cost of heat exchangers using uncomplicated process equipment.

Claims (3)

1. A method of manufacturing a heat exchanger consisting in forming two spirals of a dish-shaped form, assembling them with each other with branch pipes and conical lids and their subsequent rigid connection, characterized in that, in order to simplify the manufacturing technology, the helix is formed by winding a strip on the mandrel turn to After winding the disc-shaped form, and after winding, the helix is calibrated in a step; the helix is assembled between itself by turning one of the helixes through 180 ° and wrapping the helix into a helix on the mandrel. 2. A method according to claim 1, characterized in that the wrapping is carried out on a cylindrical mandrel. 3. A method according to claim 1, characterized in that, in order to improve the quality of manufacture, the helix is wrapped into a spiral on a screw mandrel with a conical profile of turns and followed by fixing the turns in the radial direction. G J Fig / J M ex "thirty Gj Q Phi. four