RU2116601C1 - Heat exchanger - Google Patents

Abstract

FIELD: radiators for automobile transport, water-and-oil coolers, heat exchangers of electric transformers and refrigerating machines. SUBSTANCE: heat exchanger is made in form of plate stack 1 with holes having beads inserted one in other forming through tubular spaces in plate stack 1. Beads of holes are made in form of two stages 2 and 3; outer diameter of extreme stage 2 of bead is equal to inner diameter of second stage 3 of bead located at base of plate stack 1. One or more plates provided with beads may be pressed on outer surface of stage 3 of bead located near base of plate for increase of area of heat-transfer surface. Inner surface of extreme stage 2 of bead may be provided with circular grooves to enhance tightness and strength. Besides that, beads of holes of plates 1 or entire plates 1 may be coated with low-melting metals, sealing compounds or enamels to enhance tightness, strength and corrosion resistance. EFFECT: enhanced tightness, strength and corrosion resistance. 4 cl, 4 dwg

Description

 The invention relates to heat exchange equipment, and in particular to devices of plate-tube type heat exchangers of sheet material used as motor radiators, oil and water coolers, heat exchangers of electric transformers and refrigerating machines, etc.

 A plate-tube type heat exchanger is known, comprising fins and tubular elements in the form of truncated cones with flanges at a larger base, installed one in the other and in the holes of the fins. The connection of all elements is carried out by soldering (Ed. St. N1384914, class F 28 F 3/08, 1/32).

 The disadvantage of this heat exchanger is the large number of connection points, the complexity of the soldering, low maintainability.

 The closest in technical essence and the achieved result is a heat exchanger containing a package of plates with holes made with conical flanges, inserted into each other with the formation of through pipe cavities in the package of plates, interconnected by soldering or welding (Aut. St. N 1218286, class F 28 F 3/04, 1/28).

 The disadvantage of this heat exchanger is also the high complexity of the manufacture of conical flanges, the connection of the individual elements into a single whole and at the same time its insufficient reliability, since various defects in the places of soldering or welding are possible.

 The aim of the invention is to increase the manufacturability of the heat exchanger and reduce the complexity of its manufacture, and in addition to increase its reliability.

 This goal is achieved in that the flanging of the holes stamped in the plates of the bag is made in two steps, the outer diameter of the extreme flanging of the holes being equal to the inner diameter of another flanging step located at the base of the plate. Further, the plates are assembled into a package by installing flanges of holes in each other with an interference fit, in this case strong joints between the plates are formed, and the tube cavities thus obtained are highly tight. The process of making holes in plates with flanges in the form of two steps is much more technologically advanced than obtaining holes with conical flanges.

 In addition, to increase the heat transfer surface of the proposed heat exchanger on the outer surface of the flanging steps located at the base of the plate and forming a tube cavity, one or more plates with conventional flanges are pressed.

 To increase the degree of sealing and the strength of the joints of the individual plates in a single package on the inner surface of the extreme flanging stage during assembly perform annular recesses.

 To further increase the degree of tightness, strength, as well as increase the corrosion resistance of the heat exchanger, the plate of the package or only the flanging of the plate openings is coated with fusible metals or their alloys, sealing compounds or enamels.

 Figure 1 shows the plate of the bag with flanging holes; figure 2 is a package of plates in the assembly; figure 3 is a package consisting of primary and secondary plates; in FIG. 4 - a package of plates with annular recesses on the inner surface of the extreme flanging of the holes.

 The heat exchanger contains a package of plates 1 with holes made with flanges in the form of two stages: the extreme stage 2 and stage 3 located at the base of the plate 1. The outer diameter of the extreme stage 2 is equal to the inner diameter of stage 3. The flanges of holes 2 and 3 are tightly inserted into each other friend and due to this, a tube cavity 4 is formed with a wall thickness equal to two thicknesses of the material of the plates 1.

 To increase the surface of heat transfer to the outer surface of the flanging 3 pressed from one or more additional plates 5 with conventional flanging 6.

 To increase the degree of sealing and the strength of the joints of the individual plates 1 into a single package, annular recesses 7 are made on the inner surface of the flanging stage 2.

 Plates 1 or flanging holes of the plates 1 can be coated with low-melting metals or their alloys, sealing compounds or enamels.

 The manufacture of the heat exchanger is as follows.

 In the plates 1, holes with a flange are stamped in the form of two steps - the extreme step 2 and step 3 located at the base of the plate 1.

 Next, the plates are collected in the installation package of steps 2 and 3 of the flanging holes in each other with an interference fit. If necessary, crimping the package.

 In the manufacture of a heat exchanger with increased heat transfer through the use of additional plates 5, the assembly of the package is carried out sequentially. On the outer surface of the flanging 3 of the plate 1, a plate 5 is installed using the flanges 6, then a plate 1 is installed, then a plate 5 etc.

 If it is necessary to manufacture heat exchangers with increased tightness and strength, the pre-plates 1 or only the flanges of the holes are coated with low-melting metals or their alloys, sealing compounds or enamels, followed by melting or drying, and then, in the process of assembling the bag, annular recesses are pressed on the inner surface of the flanging stage 2 6 .

 Thus, the proposed heat exchanger is technologically advanced in manufacturing and reliable in operation.

Claims (4)

 1. A heat exchanger containing a package of plates with holes made with flanges inserted into each other and forming through pipe cavities in the package of plates, characterized in that the flanges of the holes are made in two stages, the outer diameter of the extreme flanging stage being equal to the inner diameter of the second stage flanging located at the base of the plate.  2. The heat exchanger according to claim 1, characterized in that on the outer surface of the flanging steps located at the base of the plate are pressed from one or more flanging plates to increase the heat transfer surface.  3. The heat exchanger according to claims 1 and 2, characterized in that annular recesses are made on the inner surface of the extreme flanging step to increase the degree of sealing and strength.  4. The heat exchanger according to claims 1 to 3, characterized in that the plates of the bag or flanging of the holes of the plates are coated with low-melting metals or their alloys, sealing compounds or enamels to increase the degree of sealing, hardening and corrosion resistance.

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