JPS5986897A - Heat exchanger and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate-shaped hollow body consisting of a steel plate having a gap for passage of a fluid, preferably liquid heat medium, and a hollow plate having four walls, which is thermally connected to a steel wall. at least one that stands out
The present invention relates to a heat exchanger, in particular a heater or a heat absorber, having two heat exchanger plates.

This kind of heat exchanger has a heat dissipation surface (e.g. in the case of a heater)
Alternatively, it has the advantage that the heat absorption surface (for example in the case of a heat absorber) is very significantly increased compared to a heat exchanger consisting only of hollow bodies. The effect of a heat exchanger plate is the greater the stronger the heat flow through the plate. The heat flow (VC) depends on the thermal conductivity and the cross-sectional area of the heat exchanger plate.

In the case of known heat exchangers of the type mentioned at the outset, the heat exchanger plates are made of copper. Steel is used because a thermally conductive connection by welding the heat exchanger plate directly to the hollow body can be made at an advantageous cost. Of course, the efficiency of steel heat exchanger plates is limited by the relatively poor thermal conductivity of this material, since for weight and cost reasons the heat exchanger plates have only a medium thickness. This is because the heat conduction is proportional to the plate thickness.The present invention provides a heat exchanger of the type mentioned at the beginning, in which the efficiency of the heat exchanger plate is significantly increased despite the predetermined plate thickness. System based on the problem of configuring it like this! Especially r'b.

This problem is solved by brazing the heat transfer plate to the hollow body or crimping it to the hollow body using a material welded to the hollow body.

The thermal conductivity of ordinary steel is about 40”vV/mK,
The thermal conductivity of stainless steel is only about 15 W/mK, while the thermal conductivity of aluminum is about 200 W/mK.
The thermal conductivity is five times that of ordinary steel. Even if the aluminum plate has a predetermined thickness and thickness, five times as much heat is transferred to the aluminum plate as to a steel plate. As a result, the efficiency of the heat exchanger plates is greatly increased, and thus the overall Ml force of the heat exchanger is also increased. Also, the combination of steel walls and aluminum heat exchanger plates has no problems in terms of corrosion. Aluminum and steel are far apart in terms of the electrochemical sequence of gold, but this is not a disadvantage.

This is because there is generally no electrolyte between the hollow body and the heat exchanger plate. Although electrolytes may sometimes form in the form of sweat water under unfavorable installation conditions, they are in no way dangerous to the sealing of the hollow body, since base metals, such as aluminum, are sacrificial ( 1'?: Otherwise, the heat exchanger plate will not be corroded by the combination, but the hollow body will not be corroded.Furthermore, the combination according to the present invention has a higher resistance to corrosion than the hollow body made of aluminum. It is also advantageous that the hot water (A) is in contact only with the steel pipes and can therefore be connected directly to a heater or other heat exchanger without purple defects. In the case of heat exchangers, there is no need for intermediate joints of the plastic parts of the pipes to be connected, which is necessary due to corrosion considerations when using aluminum heat exchangers. When a steel plate is used as the heat exchanger plate, it is possible to make the heat exchanger plate extremely long.For example, in the case of a heater, the heat exchanger plate is placed far away from the contact area with the steel plate. The present invention is limited to the use of aluminum as a material with good thermal conductivity. Other metals with low thermal conductivity, such as many aluminum alloys and copper, are also suitable.

According to the first development of the present invention, t'L penetrates the heat exchanger plate at points [7 and the steel wall V is connected to the bath receiver 'i'' at the penetration points.
A thin steel plate is applied. Using this combination method,
Even if aluminum and other thermally conductive materials cannot be bonded to copper, extremely advantageous and inexpensive bonding methods can be applied. The preferably planned and regular interlocking between the steel sheet and the heat exchanger plate greatly facilitates the precise positioning of the steel sheet.

There are various variations of such a connection. Pre-drilled holes in the heat exchanger plate have the advantage that welding of the heat exchanger plate is not necessary and a very durable bond between the strip and the steel wall can be obtained. In particular, when a strip-shaped thin plate is pushed into a hole by a bath contact electrode, it is difficult to obtain close and good thermally conductive contact with the steel wall of the heat exchanger plate even if the manufacturing tolerances for the hole diameter and hole spacing are large. Ru.

Is there a hole in the thin steel plate formed in the heat exchanger plate by melting of the heat exchanger plate and λi radiation? If the wall of the hole mJ is in close contact with the wall of the recess in the thin steel plate, the acid phase must penetrate and melt the heat exchanger plate, but if the thin steel plate adhered to f′L, The advantage is that it has a very strong bond with the heat exchanger plate, whereby very good heat transfer from the steel wall to the heat exchanger plate is achieved. If the heat exchanger plate must be melted through during welding, the melting point of the heat exchanger plate is lower than that of copper (at least about 50° C.). This condition is particularly true for aluminum and aluminum alloys. Through-melting of the heat exchanger plate, for this reason, welding between the strip thin plate and the steel wall after through-melting? # If a grounding electrode is used, this can be achieved without additional work. Also, in the case of other fixing methods, the melting point of the heat exchanger plate may be higher than the melting point of 1.41 mm. The deposited flfC steel sheet advantageously has approximately the same thickness as the heat exchanger plate, and if the heat exchanger plate is made of copper particles and fixed to the steel wall, the decopper particles are If the heat exchanger plate is melted and embedded in the same plate and the steel wall is exposed to a strong bath, the adhesion will occur.
The copper sheet may also be omitted, since such an embodiment is extremely inexpensive. In this case too, welding electrodes can be used for the penetration melting of the heat exchanger plates and the subsequent welding. The above-mentioned bonding method can also be applied to the case where a retaining plate made of copper is further arranged between the steel wall and the heat exchanger plate. This retaining plate is connected to the steel wall in a conventional manner by spot welding and can have a very advantageous surface for the attachment of the heat exchanger plate.

According to a second development of the invention, the heat exchanger plate is held by being pushed into a recess in a retaining plate consisting of a steel wall or a steel plate welded to the steel wall. This bonding is also possible even though aluminum and steel cannot be bath-welded to each other. In the case of a rigid bonding method, a retaining plate forming an undercut groove is used, (1)
Advantageously, the heat exchanger plate is inserted into the sawn undercut. Such a holding plate can be easily brought into a shape suitable for fixing the heat exchanger plate. The holding plate can be joined to the hollow body by spot welding in the usual way. In general, suitable holes for retaining the heat exchanger plates can be easily provided, as is possible with the steel wall itself. In this case, heat is transferred from the steel wall to the heat exchanger plate via the retainer plate. In this respect, the holding plate also has a heat conduction function.

The heat exchanger plate preferably has no surface coating. This is possible because aluminum plates also have full corrosion resistance without surface coating. This is advantageous for heat exchange with the environment. Son
This is because there is no resistance that surface coatings typically provide.

A suitable thickness of the heat transfer plate is 0.1 to 0.8 mm, preferably 0.3 mm to 0.5 mm. 03~0.5 rum
The thickness of 15~
A 2.5 mm thick gold plate has a thermal conductivity comparable to that of a copper plate. However, because of its high thermal conductivity, 03 sushi also requires the use of a thin heat transfer plate. In this case, a guaranteed f' arrangement of the heat exchanger plates is advantageous in order to avoid deformations.

The heat exchanger according to the invention can be implemented using several separate heat exchanger plates and one or more large interconnected heat exchanger plates. In the case of the two embodiments, for good heat conduction, it is advantageous to shape them so that the heat-absorbing or heat-releasing surface is as large as possible.

The joining of materials that cannot be welded together is often possible by brazing. Therefore, according to the present invention, it is also possible to propose a heat exchanger in which the heat exchanger plate is directly connected to the steel wall by brazing, provided that the heat exchanger plate has better heat transfer properties than steel.

Next, the present invention will be explained in detail with reference to the drawings.

The heat exchanger according to FIG. 1 has a hollow body 1 and a heat exchanger plate 2 thermally connected thereto. The heat exchanger plate 2 has a rectangular shape as shown in FIG.

The hollow body 1 may be made of steel and may, for example, consist of two shells welded together at their respective edges, as shown in FIGS. 13 and 14. On the other hand, the heat exchanger plate 2 is made of another material having a higher thermal conductivity than that of steel. Aluminum and aluminum alloys are preferred. In the following, it is assumed that aluminum heat exchanger plates are used in the illustrated embodiment. It is well known that aluminum and clay cannot be welded together. Therefore, the structure described below was applied to obtain a good thermally conductive bond.

All heat transfer plates have side pieces 2a parallel to the hollow body 1 and side pieces 2b projecting from the hollow body.

In the embodiment according to FIG. 7, the side piece 2a has a hole 3. A strip-shaped thin plate 4 is applied onto the side piece 2a. In every hole region, the strip has a recess 5 which passes through the arranged hole 3 and is connected to the hollow body l by spot welding. The welded portion is indicated by 6.

The side piece 2a is closely pressed onto the hollow body 1 by means of a strip-shaped sheet 4, so that a good thermally conductive connection is obtained. Welding is carried out using welding electrodes 7 and 8, which are in contact with the hollow body during welding.

Welding electrodes 7, 8 are shown in a retracted state. During the welding operation, the electrode 8 is pressed onto the sheet metal strip 4 and the electrode 7 onto the hollow body 1. The electrode 8 also forms a depression. The thin strip 4 is also flat in the area of the hole 3 before the electrodes are crimped.

Similarly, in the embodiment according to FIG.
It is used for fixing the side piece 2'a of the heat exchanger plate, but there are no pre-punched holes in the side piece 2'a. The strip-like sheet metal 4 is connected to the steel wall of the hollow body 1 by welding the side pieces 2/a through at the welding points. A hole 9 is similarly produced during this through melting, but its wall is not cylindrical but has a flat hollow conical shape. In this case too, the strip 4 is pushed in (recess 10), but the recess is flatter. Since the formation of the holes 9 takes place by melting, the hole walls 9a are adapted to the shape of the depressions 9 and a very strong contact is formed. The actual welding area is indicated by 11.

For welding, spot welding electrodes 7 and 8 (shown in a slightly retracted state) are used here as well.

In the embodiment according to FIG. 9, steel particles are embedded in the side piece 2a. These steel particles are welded to a steel wall I, for example the wall of a hollow body.

When forming the bond, steel particles, which may consist of scrap material, are sprinkled onto the side pieces 2a. Welding electrode 7
. These steel particles, as well as heat transfer plates made of aluminum, have extremely high melting points.

Eventually at least some particles 12 will come into contact with the steel wall 1 and welding will be achieved. In this case, the welding location is represented by 13. The embodiment according to FIG. 9 has the advantage that it does not require special strips as used in the embodiments according to FIGS. 7 and 8.

3 to 6 illustrate other shapes of the heat exchanger plate. Third
The figure shows a web 20a and a side piece 20b.

20c shows a U-shaped heat exchanger plate 2o. web 20
a may be connected to the hollow body l in the manner described in FIGS. 7-9. FIG. 4 shows a heat transfer plate 21 having a flat side piece 21a and a shaped side piece 21b. The side piece 21a may be fixed as described above. Side piece 21
The shape of b enlarges the surface compared to a flat side piece.

Such surface enlargement is advantageous because heat transfer in aluminum is good.

FIG. 5 shows a heat exchanger plate 22 having a hat-shaped cross section. This cross-sectional shape has edge bends 2 at the ends of the side pieces 22a and 22b.
The cross-sectional shape differs from that shown in FIG. 3 due to the presence of 2c and 22d. FIG. 6 shows a heat exchanger plate 23 having a side piece 23b perpendicular to the fixed piece 23a1 and a box-shaped portion 23c arranged at the end of the side piece 23b.

This heat exchanger plate may also be fixed in the same manner as the other heat exchanger plates, and its surface is also enlarged by the box-shaped portion 23c.

10 to 14 illustrate a heat exchanger having a large heat exchanger plate 14 bent in a meandering manner in place of the individual heat exchanger plates and fixed to a hollow body 15.

This fixing is carried out as described for the heat exchanger plate 2 in FIG.

The heat transfer plate 14 is in contact with the hollow plate 15 with a heat conduction area 16 . Between two such contact areas there is a bend 17 which releases heat to the ambient air (in the case of a heater) or receives heat from the ambient air (in the case of a heat sink). A sheet steel strip 18 is applied onto each heat transfer area 16 and is pushed through the holes provided in the heat transfer area 16 when forming the connection.

FIG. 11 shows the state before welding.

In this state, the steel sheet 18 is still flat. FIG. 12 shows the state after welding. In this respect, FIG. 12 coincides with FIG. 7. FIG. 13 again shows the state before welding. In order to facilitate a precise positioning of the steel strip 18 relative to the heat exchanger plate, the heat exchanger plate is provided with projections 24 in the heat transfer zone 16, which can be pressed into corresponding recesses 25 in the steel strip 18. fit. FIG. 14 shows the state after welding. The projections and depressions 24, 25 may also be compressed and smoothed during welding.

However, it may also be omitted.

The hollow body 15 is composed of two outer skins 26 and 27. Here, the member to which the heat exchanger plate is fixed does not necessarily have to be a hollow body. For example, it is also possible to electrically heat the fixed sheet steel wall of the heat exchanger plate, in which case a hollow body through which the fluid heat medium passes is not necessary.

The height of the bent portion is represented by b (FIG. 11), and the thickness of the heat exchanger plate is represented by a. For a given heat exchanger plate thickness a, the height b can be significantly greater than the effective value, even if the heat exchanger plate is made of steel.

Due to the extremely good thermal conductivity of aluminum, even with relatively large heights b, a large amount of heat is still conducted into the outer region of the bend, where there still exists a noticeable temperature difference with respect to the ambient air.

FIG. 15 shows a structure which corresponds in principle to the structure according to FIGS. 10-14. In Fig. 15 (d1 steel wall 28 has heat exchanger plates 29 or 30 or 3 of different heights h!, l+2 or h3).
1 can be fixed. In this case as well, fixing by means of applied strips 32 is used. Since the classification of heat exchanger plates of different heights is the same,
The same steel wall 28 can be used for all these heat exchanger plates. The selection of the appropriate heat exchanger plate is made depending on the temperature difference present and the desired efficiency of the heat exchanger.

FIG. 16 shows that a large heat exchanger plate with connections υ may also be shaped so that its surface is enlarged. Two hollow bodies 33 and 34 are shown, and heat transfer plates 35 are fixed to mutually opposing surfaces of these hollow bodies. The heat exchanger plate 35 has a heat conduction area 36 adjoining the hollow body 33,34. These heat exchanger plates are also fixed to juxtaposed hollow bodies using applied steel strips.

A bent portion 38 protrudes from the hollow body between the two heat conduction regions.
exists. The bend is shaped serpentinely by the concave shape 39 and by itself 9, so that its surface and thus also its contact area with the ambient air is significantly enlarged. In this way also the good thermal conductivity of aluminum can be fully exploited. This structure also requires a fee when the height of the heat exchanger plate is set and a large surface of the heat exchanger plate is desired.

FIG. 18 shows an embodiment in which a retaining plate 41 made of steel is fixed to a steel wall 40, and an actual heat transfer plate 42 made of aluminum is then bonded to the retaining plate.

The holding plate 41 is curved in a serpentine manner and is connected to the steel wall 40 by spot welds 44 in the fixing region 43 . 2
Between the two fastening areas 43 extends a bend 45 with a flat wall 45'a to which the heat exchanger plate is attached. The heat exchanger plate is formed according to FIGS. 10-14 and is similarly fixed using a strip-shaped steel sheet 18. In this embodiment, the holding plate 41 also has a heat transfer function, since heat has to be transferred from the steel wall 40 to the heat exchanger plate 41. Since the environmental air also flows over the retainer plate 41, it receives heat directly from the retainer plate as well.

In the embodiment according to FIG. 17, a holding plate 47 is attached to the steel wall 46. The holding plate 47 is used for clamping the heat exchanger plate 48. The retaining plate 47 has a fastening area 49 connected to the copper plate 46 by spot welds 50. This is possible by using the same material for parts 46 and 47.

The fixed plate 49 has undercuts 52 and 53 on its side walls.
A groove 51 having a groove 51 is formed. Aluminum heat transfer plate 48
is generally meandering. At the bent portion adjacent to the steel plate 46, there is a bulge 54 that fits into the undercut.
．． There are 55.

Mounting can take place, for example, by pushing the heat exchanger plate into the groove 51 with a direction of movement perpendicular to the drawing.

In addition, in the case of the movement direction parallel to the drawing, the steel plate 4
A modification is also possible in which the end of the bent portion adjacent to 6 can be inserted into the miso. Such deformation is indicated by the dashed line 56
It is illustrated by.

In the embodiment according to FIG. 17, in the case of heat dissipation from the steel wall 46, the heat is first conducted via the holding plate 47. Heat is conducted to the heat transfer plate 48 at the contact area in the groove 51. In order to achieve good heat transfer, the heat transfer plate should be in contact with the holding plate 47 with as little gap as possible. It is desirable to have one.

Figures 19 and 20 illustrate the manufacture of a heater in which the heat exchanger plate is connected to a steel wall by brazing or bonding. In FIG. 19, the steel wall is represented by 61, and the heat exchanger plate is represented by 60. The heat required for brazing is generated by the welding electrode 71, s
/ is transmitted through the metal plate 60, 61. In this case, a brazing portion 64 is formed. Brazing is part 6
The size of 4 is determined by the shape of the electrode 7', which in this example has a comparatively narrow shape rR.

In FIG. 20, the steel wall is represented by 63, and the heat exchanger plate is represented by 62. The heat exchanger plate 62 has protrusions 65 at predetermined brazing positions and in contact with the Kanaoka wall before brazing starts. When brazing to obtain a bond, electrode 711. Electricity is passed through the metal plates 62, 63 through Btt, thereby generating the heat necessary for brazing. Brazing starts in the region of the protrusion 65, and as the brazing progresses, it becomes compressed and smooth, so that the heat exchanger plate 62 contacts the steel plate 63 without any gaps. Second
In the variant shown in FIG. 0, the brazing area is limited by the protrusion 65, so that the upper electrode 7 has a significantly larger diameter than the brazing area.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a heat exchanger with a hollow body wall and several angular heat transfer plates fixed therein, and FIGS. 2 to 6 are angular heat transfer plates used in the heat exchanger according to FIG. Cross-sectional views of various shapes of plates - Fig. 7 is a partial sectional view in the fixing region of the hollow body and the heat exchanger plate when the applied thin steel plate is pushed through the holes of the heat exchanger plate; FIG. 8 is a cross-sectional view corresponding to FIG. 7 of the fixation area when the heat exchanger plate is melted through, and FIG. 9 shows sections 7 and 8 when the fixation of the heat exchanger plate is performed by embedded steel particles. Fig. 1 is a cross-sectional view corresponding to the figure, Fig. io is a perspective view of a heat exchanger using a large heat exchanger plate bent in a serpentine shape with a link, and Fig. 11 is a heat exchanger plate in a hollow body. Cross-sectional view of the heat exchanger according to FIG. 10 showing the state before fixing the
2 is a sectional view corresponding to FIG. 11 showing the state after fixing the heat exchanger plate, FIG. 13 is a longitudinal sectional view of the heat exchanger according to FIG. 10 in the state before fixing (FIG. 11), Fig. 14 is a cross-sectional view of the heat exchanger in the state after measurement, and Fig. 16 is a heat exchanger having two hollow bodies and a large heat exchanger plate fixed to these and having several shaped bent parts. Cross-sectional view of the vessel, imperial edict 17
The figure is a cross-sectional view of the heat exchanger when the heat exchanger plate is fixed to the hollow body by being pushed into the retainer plate, and Figure 18 is a cross-sectional view of the
17, a cross-sectional view corresponding to FIG. 19 of the heat exchanger when the connection according to FIGS.
Figure 2 is a partial sectional view corresponding to Figures 7, 8 and 9 showing how the heat transfer plate is joined to the steel wall by brazing or bonding;
FIG. 0 is a sectional view corresponding to FIG. 19 showing how the brazing area can be limited by the protrusions of the heat exchanger plate: 1.15...-Hollow body, 2.20.21.22.23° 14.29, 30, 31, 35, 48, 42, 60, 6
2... Heat exchanger plate, 2a, 20a, 21a, 22a, 23
a... Side piece of Hannetsu plate, 3, 9... One hole, 4, 18, 3
2, 37... Strip-shaped ls4 thin plate, 7, 8... Welding electrode, 12... Steel particles, 24... Protrusion, 25... Hollow, 28, 4Q, 46, 61.

Claims (1)

[Claims] 1. A plate-shaped hollow body (1; 15; 28; 46; 40; 61;
63) and heat transfer plates (2; 20; 21; 22; 23; 14; 2) thermally connected to the steel walls and protruding from the four walls.
9; 30; 31; 35; 48; 42; 60; 62);
;23;14;29;30;31;35;48;42;
60; 62) is made of a metal having a thermal conductivity higher than that of steel;
2; 23; 14; 29; 30; 31; 35; 48; 42
;60;62) is a hollow body (1;15;28;46;40
;61;63) or hollow body (1
; 15; 28; 46; 40; 61; 2. Heat transfer plate (2; 20; 21; 22; 23; 14; 2
9; 30; 31; 35; 48; 42; 60; 62) is made of aluminum or an aluminum alloy. 3. Heat transfer plate (2; 20; 21; 22; 23; 14; 29
;30;31;41), the same heat exchanger plate is passed through the shell in some places, and the steel wall (1;27;28;
Copper thin plate (4; 18) welded to 33; 34; 40)
; 32; 37) is deposited on the heat exchanger plate (14), and in this case, preferably, the VC is inserted into the recess (25) of the thin steel plate (18) in order to orient the thin steel plate with respect to the heat exchanger plate. The protrusion (
24) The heat exchanger according to claim 1 or 2, wherein: 4. The steel thin plate (4; 18; 32; 37; 18) is pushed into the punched hole (3, 19) of the heat transfer plate (2; 14; 29; 30; 31; 38; 39; 42) and becomes depressed. 5), the same α heat exchanger. 5 The melting point of the heat exchanger plate (2'a) material is one degree lower than the melting point of mackerel, and the thin copper plate (4) is formed on the same plate by melting and evaporating the heat exchanger plate (2'a,). through the hole (9),
4. Heat exchanger according to claim 3, wherein the walls of the holes are in contact with the walls of the recesses (10) of the steel sheet (4). 6. Steel thin plates (4; 18; 32; 37; 18)
2; 14; 29; 30; 31; 38; 39; 42); γ Heat exchanger plate (2, 2'a) The melting point of the material is lower than the melting point of copper, and the heat exchanger plate (2, 2'a) is fixed to the wall CI) by steel particles [12]. Oji, this gap 4 particles Cl2) are caused by the melting VC of the heat exchanger plate (2, 2
'a) Embedded in the wall (1) K bath contact n
A heat exchanger according to claim 1. 8. Claims 3 to 7, in which the heat exchanger plate (42) is connected 37' to a retaining plate (41) consisting of a cage, which is also in contact with the steel wall (40). The heat exchanger according to Item 1. 9 The heat exchanger plate (48) is fitted into the recess (51) with a retaining plate (4
7) A heat exchanger according to claim 11 in which the retention Δn is maintained at Δn. The lO retaining plate (47) has the undercut groove (51) fully formed and the heat transfer f (48) has the undercut (51).
s2.53) The heat exchanger according to claim 1, having edge-like projections C54 and C55 that fit into the heat exchanger. 11 Heat exchanger plate C2; 20; 21; 22; 23; 14;
29; 30; 31; 48: 42) does not have a sickle mask.
/)Heat exchanger. 12 Den V) '+L'j (2r 20 r 21
+ 22 : 23 + 14+ l 9 ;30;3
1;48;42) is 0.1~. 0. ' 8 rran
12. A heat converter according to any one of claims 1 to 11, having a thickness of from 0.3 rran to 05 cm. 13. Several different types of heat exchanger plates (2; 20; 21; 22; 2
3) Izuka 1 of claims 1 to 12 having k
Heat exchanger as described in Section. 14 The heat exchanger plates (2; 21; 23) are generally angular and contact with the fixed side pieces (2a; 21a; 23a) the steel wall (1) or a retaining plate connected to the steel wall and Depending on the case, the shape of nC21b; 23b), steel wall (1
) projecting from the side pieces (2b; 21; 23b)'ff: The heat exchanger according to claim 13. 15. The heat transfer plate (20; 22) is approximately U'￥
A solid foot area (20a: 22a) that forms a U-shape
14. Heat exchanger according to claim 13, in which the retaining plate) contacts the steel wall (1) or a retaining plate connected to the steel wall. 16 Heat exchanger plate (14; 29; 30; 31; 35; 42
;48) is formed by several bending parts (17;38) by means known per se.
) and the top (16; 3) of the same bent part (17; 38)
6) in contact with the steel wall (27; 28; 33; 34) or the retaining plate (41) connected to the steel wall f' according to any one of claims 1 to 13. heat exchanger. 17 Bent part C38 protruding from the steel wall (33, 34,)
) has a shape due to the expansion of its surface (concave 39
) A heat exchanger according to claim 16. 18. The heat exchanger according to claim 1, wherein the heat exchanger plates (60; 62) are directly connected to the walls (61; 63) by soldering. 19 A plate-shaped hollow body consisting of a copper plate having a gap for passing through a fluid thermal body and a heat exchanger plate thermally connected to the J wall and protruding from the four walls, Board 14
Thermal conductivity greater than the thermal conductivity of ? A thin steel plate, which is made of metal and is adhered to the heat transfer plate, is pushed into the punched holes (3; 19) provided here and there on the heat transfer plate. page through f
In order to manufacture an RC heat exchanger in contact with a steel wall, the steel sheet metal is rolled into an unpressed form and adhered to the heat exchanger plate, and the bath slave electrode [8]
The method for manufacturing the heat exchanger, characterized in that the heat exchanger is pushed into the hole (3; 19) (recessed hole 5) by the hole (3; 19) and penetrated through the hole. 20 It has a plate-like hollow body made of a copper plate having a gap for passing a fluid heat medium and a heat transfer plate that is thermally connected to the steel wall and protrudes from the four walls, and the heat transfer plate is connected to the pot. The heat transfer plate (
2'a) The melting point of the material is lower than the fd point and the thin steel plate (4) coated with Vc on the heat exchanger plate (2'2) melts on the heat exchanger plate (2'a). and welded to the fA4 wall through a hole [9] made in the heat exchanger plate for evaporation, and at this time, the wall of the hole is inserted into the recess (10) of the thin copper plate (4). In manufacturing a heat exchanger consisting of a thin steel plate (4) which is in contact with the wall of (2' A.) coated on top;
When a strong current supplied by the U-contact electrodes (7, 8) is applied, the bath-contact electrode dissipates Pa at the heat transfer plate (2'a)'Th bath-contact part and contacts the thin steel plate (4) thereto. The heat exchanger is characterized in that the thin steel plate (4) is welded to the steel plate (1) by pushing the thin steel plate (4) to the steel wall (1) by pushing the thin steel plate (8) until the thin steel plate (4) comes into contact with the steel wall (1), excluding the heat transfer plate. How to make the utensils. 21, a plate-shaped hollow body made of a steel plate with a gap for passing a fluid heat medium, and a heat transfer plate that is thermally connected to the steel wall and protrudes from the four walls (1); The heat exchanger plate (C2, 2'a) consists of an entertainment plate having a thermal conductivity greater than that of steel, and the heat exchanger plate (C2, 2'a) has a melting point lower than the melting point of copper and the heat exchanger plate (2, 2'a) a) is formed by steel particles (12) into a steel wall (1
), and at this time, the copper particles (12) are embedded in the heat exchanger plate (2, 2"a) by melting and Q4k
(1) In manufacturing a heat exchanger consisting of IC@contact, steel particles (12
)' and heat transfer plate (2"a)? Welding electrode (7, 8)
The heat exchanger plate (2'a) is melted when a strong current supplied by k is applied and contacts the heat exchanger plate (2'a) to the steel particles (12)' using a bath contact electrode (8). Steel wall through the inside (1)
A method for manufacturing a preheat exchanger, characterized in that the preheat exchanger is crimped onto a steel wall and in contact with a steel wall.