JP4354796B2 - Heat exchanger element and manufacturing method thereof - Google Patents

Description

  The present invention relates to a structure in which a flat channel in which a heat exchange medium flows is formed inside a pair of opposed metal plates, and the flat channel is bent in a waveform.

  Various heat exchangers for regenerators in which a large number of metal plates are stacked and a heated fluid and a fluid to be heated are alternately passed between the metal plates are known. Further, a drone cup type heat exchanger in which the surface of the metal plate is bent into a corrugated shape to improve the heat transfer area is also known. The element of the drone cup type heat exchanger is provided with header portions at both ends of a plate-shaped metal plate and a corrugated heat transfer portion therebetween. Then, the first heat exchange medium is circulated in the element, and the second heat exchange medium is circulated on the outer surface side to exchange heat between them.

The element of the conventional drone cup type heat exchanger cannot take the wave height (amplitude) at the corrugated heat transfer section. This is because flat header portions exist on both sides of the corrugated heat transfer section, which may cause a crack at the boundary between the corrugated heat transfer section and the header section.
That is, when the height of the wave is increased, the metal plate is greatly drawn with respect to the header portion, and a crack is likely to occur at the boundary. Therefore, the element having the conventional corrugated heat transfer section has to have a relatively low wave height. As a result, the heat transfer area of the corrugated heat transfer section was relatively small, and the improvement in heat exchange performance could not be expected much.

  Therefore, the present invention provides an element for a heat exchanger and a method for manufacturing the same, in which the height of the wave is sufficiently high, cracks are not generated at the boundary with the header portion, and the periphery can be reliably joined. The task is to do.

The present invention according to claim 1 is a flat plate formed by pressing a pair of opposing metal plates in a flange shape, closing the edges together, and circulating a heat exchange medium therein. Waveform heat transfer that forms a flow path and is provided with a pair of header parts (3) at both ends in the flow direction of the flat flow path, and is bent into a large number of parallel waveforms between the header parts (3). In the method for manufacturing a heat exchanger element provided with the section (4),
The pair of metal plates facing each other are folded by overlapping one metal plate at its side, and the folded edge (12) is formed in the flange shape,
Each wave of the corrugated heat transfer section (4) is continuous to both sides of the ridgeline of the wave and extends to the full width of the pair of header sections (3). Shape linear wave (14)
The header part (3) collapses flatly in the direction of travel of each wave in a sigmoidal shape in one direction and is flatly crushed. Is formed at a constant pitch, and there is a non-polymerized portion corresponding to one sheet thickness between each superposed portion (5), and the inner surface side of the superposed portion (5) and the inner surface side of the non-polymerized portion are flush with each other. Formed into
The height of the header portion (3) is higher than the peripheral flange and lower than the amplitude height of the corrugated heat transfer portion (4) between the pair of header portions (3), and the header portion (3) Form a flange (10) at the periphery,
The groove width matching the thickness of the pair of flange portions (10) in a state where the flange portions (10) of the pair of metal plates folded and opposed to each other are in contact with each other on the flat surface on the inner surface side. Is fitted to the pair of flange portions (10),
Seam welding is performed from above and below the groove member (11), the flange portion (10) is welded together with the groove member (11), and the uneven surface which is the overlapping portion (5) of the flange portion (10) is welded. A method for producing an element for a heat exchanger, characterized in that the heat exchanger element is flatly formed and is hermetically and integrally welded between a channel member (11) and a pair of flanges (10).

The present invention is defined in claim 2, in the method for manufacturing the heat exchanger element according to claim 1, thereby forming the header portion of the waveform (3) in a substantially rectangular cross section wave, first the one side 1 Forming the rising surface (6) as an inclined surface and the ridge line as a flat surface, and forming the second rising surface (7) on the other side perpendicular to the ridge line ;
That header portion waveforms surface (3) and debt press to the tilt direction, and then press ulcers, cause form together Pressed flat S-shaped cross-section of the overlapped portion (5) step,
It is a manufacturing method of the element for heat exchangers which has these.
The present invention according to claim 3 is an element for a heat exchanger formed according to claim 1 or claim 2.

The heat exchanger element manufacturing method of the present invention comprises a press-formed body of a metal plate, and even if the wave height of the corrugated heat transfer section 4 is increased, the elongation due to corrugation is formed at the boundary with the header section 3. Will not occur, and cracks will not occur even if the height of the corrugated heat transfer section 4 is increased. Therefore, it is possible to provide a compact element having a high wave height in the corrugated heat transfer section 4 and a large heat transfer area.
In addition, the overlapping portion 5 of the header portion 3 has each wave extending there in a S-shaped cross-section only on one side in the traveling direction and is crushed flat, and its height is higher than that of the peripheral flange. Since the flange portion 10 is formed at the end edge of the header portion 3 and is formed lower than the heat transfer portion, the structure of the overlapping portion 5 is simplified, and leakage hardly occurs when the flange portion 10 at the edge is welded. The header part 3 can be formed.
Moreover, the flange portion 10 of the edge forms the inner surface side of the overlapping portion 5 and the inner surface side of the non-overlapping portion on the same plane, and the flange portions 10 of the pair of metal plates that are folded back to face each other. Since the flange portion 10 is integrally welded and fixed in contact with the same flat surface on the inner surface side, the header portion 3 that is less likely to leak can be formed.
Further, the groove member 11 is fitted to the pair of flange portions 10, and seam welding is performed from above and below the groove member 11, and the flange portion 10 is welded together with the groove member 11, so that the overlapping portion of the flange portion 10 is welded. Since the uneven surface 5 is formed flat by welding and the groove member 11 and the pair of flanges 10 are integrally and airtightly welded, a highly reliable element can be provided.
Also, the pair of metal plates facing each other is formed by folding one metal plate on its side and overlapping it, and its folded edge is formed in a flange shape. A small and highly reliable heat exchanger element can be manufactured.

In the method of manufacturing the element having the above-described configuration,
Forming a first rising surface 6 on one side of the waveform of the header portion 3 as an inclined surface and a ridge line as a flat surface, and forming a second rising surface 7 on the other side perpendicular to the ridge line;
Pressing the corrugated surface of the header portion 3 in the inclined direction, crushing it, and forming a superposed portion 5 having a flat cross-sectional S-shape pressed against each other;
The overlapping portion 5 of the header portion 3 can be formed by crushing the first rising surface 6 so as to be pushed down.
According to this manufacturing method, the superposed part 5 having an S-shaped cross section can be formed in the header part 3 without difficulty.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded explanatory view of a main part of the present invention, and is an enlarged perspective view of a portion I in FIG. 2 is a plan view of the heat exchanger element of the present invention, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2, and FIG. 5 is a cross-sectional view showing a welded state after seam welding in the flange portion 10. FIG. 6 shows the manufacturing process of the element, (A) is a plan view of the first process, (B) is a schematic perspective view of the first process, and (C) is a schematic perspective view of the second process. (D) is a DD arrow schematic drawing of (C).

This heat exchanger element is optimal as an exhaust heat recovery regenerator, but the present invention is not limited to this and can be used as an element of various heat exchangers.
As shown in FIGS. 1 and 2, this heat exchanger is composed of a pair of metal plates 1 and 2 whose peripheral edges are closed except for a pair of entrances and exits 9, and header portions 3 are located on both sides thereof. A corrugated heat transfer section 4 is provided between them. A flat flow path is formed between the pair of metal plates 1 and 2. In this example, a single metal plate is folded into a postal envelope shape, a pair of metal plates 1 and 2 are made to face each other, a joint 13 is formed at the seam, and the whole is flattened. A flange portion 10 is joined via a channel member 11, a pair of flat holes are formed at diagonal positions, and an entrance 9 is provided there.

And the waveform heat-transfer part 4 is formed between the header parts 3 located in both sides. As shown in FIG. 6B, the ridgeline 14 of each wave of the corrugated heat transfer section 4 is formed into a curved wave 16 in which the ridgeline is bent in a meandering manner. The waveforms of the pair of opposing metal plates 1 and 2 are 180 degrees out of phase with each other, and their ridge lines intersect each other. Further, each wave of the corrugated heat transfer section 4 goes in the direction of the ridgeline, and they continuously extend over the entire width of the header section 3. In the header portion 3, the ridgeline 14 of each wave forms a straight wave 17 that is linear.
Next, in the header portion 3 located on both sides of the element, the straight wave 17 is flattened as shown in FIG. 6 (B), with each waveform being tilted in a S-shaped cross section toward one side of the wave traveling direction. And a large number of overlapping portions 5 corresponding to the thickness of three metal plates are intermittently formed there.

Such corrugated heat transfer section 4 and header section 3 can be formed by the procedure shown in FIGS.
That is, first, as shown in FIGS. 6A and 6B, the metal plate is bent into a waveform over its entire width. On both sides of the metal plate, as described above, the ridge line 14 of the wave is a linear wave 17 formed in a straight line, and the ridge line 14 is a curved wave 16 that bends in the plane direction between them. Each height, ie, amplitude, is the same, and their pitch is also the same. The curved wave 16 and the straight wave 17 are continuous. Such a curved wave 16 and a linear wave 17 can be integrally formed by a press machine, but may be formed one by one by a progressive press. In that case, a wave with a larger amplitude can be formed. The cross-sectional shape of each wave of the waveform heat transfer section 4 and the header section 3 may be a rectangular wave or a sine curve wave.
In addition, (A) of FIG. 6 is a principal part top view of a metal plate, (B) is the perspective view.

In this way, the waves on both sides of the metal plate bent at its full width are pushed down and crushed to form the overlapped portion 5 as shown in FIG. At the same time, the edge of the overlapping portion 5 is lowered, and the flange portion 10 is formed at the leading edge.
In this example, as shown in FIG. 7A, in the straight wave 17, the first rising surface 6 on one side of each wave is inclined by the angle θ, and the second rising surface 7 on the other side is formed vertically in advance. Next, the linear wave 17 is crushed from both the upper and lower sides so that the amplitude of the linear wave 17 is eliminated, and the overlapped portion 5 is formed on the center line as shown in FIG. 7B. Since only the first rising surface 6 is inclined by the angle θ, the crushing overlapping portion 5 can be easily formed as shown in FIG.

At that time, the a part and the b part of the wave in FIG. 7A are stretched, and the c part is sandwiched between the b part and the d part, thereby forming a flat overlapping portion 5 having an S-shaped cross section. . Further, the d portion and the e portion are stretched. And the plane of the superposition | polymerization part 5 formed with them is located in the intermediate position of the wave height of the curved wave 16 of the waveform heat-transfer part 4, and the boundary of the superposition | polymerization part 5 and the curved wave 16 becomes the inclined surface 19 ( FIG. 6 (C)).
Further, as shown in FIG. 6C, a flange portion 10 is formed on the side end of the overlapping portion 5 via an inclined surface 18. A pair of upper and lower metal plates 1 and 2 form a header portion 3 between the overlapping overlapping portions 5.

Next, as shown in FIG. 1, a pair of upper and lower flange portions 10 are overlapped, and a groove member 11 is fitted therein. The groove width of the groove member 11 matches the total thickness of the pair of upper and lower flange portions 10 as shown in FIGS. Then, the flange 10 is integrally welded together with the groove member 11 by seam welding from above and below the groove member 11 to complete the element. At this time, the uneven surface which is the overlapping portion 5 of the flange portion 10 is formed flat by welding, and the airtightness or liquid tightness of the flange portion 10 is ensured.
In FIG. 2, the upper and lower ends (both edges in the plane direction) of the element are folded back as shown in FIG. The folded edge 12 has no corrugation. Then, both end edges of the bag shape are overlapped as shown in FIG. 2 at the center of the plane, and the overlapped portion is joined to form the joined portion 13.

A flat hole is formed in the folded portion of each header portion 3 of such an element, and a pair of entrances 9 are provided there. Then, the fluid to be heated flows into the header portion 3 from the one inlet / outlet 9, flows through the corrugated heat transfer portion 4 in the direction of the ridgeline of the wave, and is guided to the header portion 3 on the other side. Led.
As described above, the corrugated heat transfer section 4 has waves that bend in the plane direction intersect each other vertically. And the to-be-heated fluid which distribute | circulates the inside of an element meanders the inside of the waveform heat-transfer part 4, and moves, stirring at the cross | intersection part of each wave. A high-temperature exhaust gas or the like circulates in the ridge line direction of each wave on the outer surface side of the element, and heat exchange is performed between it and the fluid to be heated.
A number of such elements are stacked, and the high-temperature exhaust gas or the like flows between the elements. The fluid to be heated is guided to the inlet / outlet 9 of each element via a manifold (not shown).

  Next, FIG. 8 shows a modification of the groove member 11 shown in FIG. 3. In the groove member 11 of this example, the opening edges of both side wall portions of the groove shape are expanded, and the expanded edge portion 11a is expanded. It aligns with and contacts the inclined surface formed at the skirt of the header 3. By providing such an expanded edge portion 11a in the groove member 11, the strength and rigidity in the vicinity of the joint portion of the element can be increased.

II section expansion perspective explanatory drawing in FIG. The top view of the element for heat exchangers of this invention. III-III arrow sectional drawing of FIG. FIG. 4 is a cross-sectional view taken along arrow IV-IV in FIG. 2.

Sectional drawing which shows the welding state after the seam welding of the flange part of the element of this invention. The manufacturing method of the header part 3 of the element of this invention is shown, Comprising: (A) is a top view which shows the 1st process, (B) is the perspective schematic diagram which shows the 1st process, (C) is the The perspective schematic diagram of a 2nd process, (D) is the DD arrow schematic diagram of (C). It is sectional drawing which shows the shaping | molding procedure of the header part 3, Comprising: (A) is the 1st process, (B) is explanatory drawing which shows the 2nd process. FIG. 3 is an element of the present invention having another channel member 11 corresponding to FIG. 3.

Explanation of symbols

1 Metal plate 2 Metal plate 3 Header part 4 Wave heat transfer part 5 Superposition part
6 First rising surface 7 Second rising surface
9 Entrance
10 Flange

11 Channel material
11a widening edge
12 Folded edge
13 Joint
14 Ridge line
15 Welded part
16 Curve
17 Linear wave
18 Inclined surface
19 Inclined surface

Claims (3)

In the metal plate press-molded body, the peripheral edges of a pair of opposing metal plates are formed in a flange shape, the peripheral edges are closed together to form a flat flow path through which the heat exchange medium flows, and the flat flow For heat exchangers with a pair of header sections (3) at both ends in the flow path direction of the path, and a plurality of corrugated heat transfer sections (4) bent in parallel between the header sections (3) In the element manufacturing method,
The pair of metal plates facing each other are folded by overlapping one metal plate at its side, and the folded edge (12) is formed in the flange shape,
Each wave of the corrugated heat transfer section (4) is continuous to both sides of the ridgeline of the wave and extends to the full width of the pair of header sections (3). Shape linear wave (14)
The header part (3) collapses flatly in the direction of travel of each wave in a sigmoidal shape in one direction and is flatly crushed. Is formed at a constant pitch, and there is a non-polymerized portion corresponding to one sheet thickness between each superposed portion (5), and the inner surface side of the superposed portion (5) and the inner surface side of the non-polymerized portion are flush with each other. Formed into
The height of the header portion (3) is higher than the peripheral flange and lower than the amplitude height of the corrugated heat transfer portion (4) between the pair of header portions (3), and the header portion (3) Form a flange (10) at the periphery,
The groove width matching the thickness of the pair of flange portions (10) in a state where the flange portions (10) of the pair of metal plates folded and opposed to each other are in contact with each other on the flat surface on the inner surface side. Is fitted to the pair of flange portions (10),
Seam welding is performed from above and below the groove member (11), the flange portion (10) is welded together with the groove member (11), and the uneven surface which is the overlapping portion (5) of the flange portion (10) is welded. A method for producing an element for a heat exchanger, characterized in that the heat exchanger element is flatly formed and is hermetically and integrally welded between a channel member (11) and a pair of flanges (10). In the manufacturing method of the element for heat exchangers of Claim 1,
The waveform of the header portion (3) is formed in a substantially rectangular cross-sectional wave shape , the first rising surface (6) on one side thereof is an inclined surface , the ridge line is a flat surface, and the other side with respect to the ridge line Forming the second rising surface (7) on the side vertically ;
That header portion waveforms surface (3) and debt press to the tilt direction, and then press ulcers, cause form together Pressed flat S-shaped cross-section of the overlapped portion (5) step,
The manufacturing method of the element for heat exchangers which has this. The element for heat exchangers formed by Claim 1 or Claim 2.

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