JPH1183370A - Manufacture of heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance strength at a joint by a structure wherein inner and outer cases are held by respective holding jigs to form an annular space between both cases and a heat exchanger material is inserted into the annular space while being clamped by a clamp member and integrated with the inner and outer cases. SOLUTION: Steps 201 , 211 of same height as an inner case 4 are formed, respectively, on the upper outer circumferential surface of the lower half 20 and the lower outer circumferential surface of the upper half 21 of an inner case holding jig 19. The lower half 20, the inner case 4 and the upper half 21 are then coupled coaxially by engaging the steps 201 , 211 , respectively, with the lower and upper edges of the inner case 4. Similarly, the lower and upper halves 24, 25 of an outer case holding jig 23 and an outer case 5 are coupled coaxially to form an annular space 26 between the inner and outer cases 4, 5 which are then integrated by setting a heat exchanger material 3 in the annular space 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger material obtained by bending a metal strip in a zigzag manner into a concentrically arranged cylindrical inner case and a cylindrical outer case having a larger diameter than the inner case. The present invention relates to a method for manufacturing a heat exchanger to be assembled therebetween.

[0002]

2. Description of the Related Art As shown in FIG. 12, a stainless steel folded plate material 1 is folded in a zigzag manner to form a heat exchanger material 3 in which a large number of heat transfer plates 2 are continuous. An annular heat exchanger in which the material 3 is mounted between a cylindrical inner case and an outer case has already been proposed in Japanese Patent Application No. 8-275051 filed by the present applicant.

FIG. 13 shows a first conventional example of a method for manufacturing such a heat exchanger. This method includes an inner case 01 and an outer case 0 having a central angle of 90 °.
The heat exchanger material 03, which is formed by folding a folded plate material in a zigzag manner between the two, is brazed, and the inner case 01
Then, side plates 04, 04 are brazed to both ends of the outer case 02, respectively, to produce a module 05. Further, the side plates 04 of four modules 05.
Are brazed to each other to form an annular heat exchanger 06.

FIG. 14 shows a second conventional example of a method for manufacturing such a heat exchanger. In this manufacturing method, a heat exchanger material 03 is disposed over the outer periphery of an inner case 01 over a 360 ° radius. Direction heat exchanger material 03
A belt-shaped outer case 02 is wound around the outer periphery of the heat exchanger, and both ends are joined by brazing to form an annular heat exchanger 06.

[0005]

However, the first manufacturing method shown in FIG. 13 not only increases the number of manufacturing steps but also makes it difficult to secure the strength because the number of brazing points is extremely large. There is a problem that the possibility that air or combustion gas leaks increases. Further, in the second manufacturing method shown in FIG. 14, the outer case 02 wound in a cylindrical shape around the outer periphery of the heat exchanger material 03 is joined by brazing at both ends, so that both ends of the outer case 02 are overlapped and brazed. In such a case, the overlapped portion becomes partially thick, and when the both end surfaces of the outer case 02 are brazed together, there is a problem that sufficient strength cannot be obtained. When brazing the outer case 02 with the both end surfaces facing each other, increasing the thickness of the outer case 02 can secure the brazing strength. When the temperature difference between the inner surface and the outer surface of the case 02 increases, there is a possibility that cracks may occur in the brazed portion due to thermal stress. At this time, the above problem can be solved by joining the both end surfaces of the outer case 02 with high strength welding in advance, but this time, the heat exchanger material 03 is placed in the cylindrical space between the inner case 01 and the outer case 02. It cannot be assembled.

The present invention has been made in view of the above circumstances, and provides a method of manufacturing a heat exchanger in which a heat exchanger material can be assembled between an inner case and an outer case which are formed in a cylindrical shape in advance. With the goal.

[0007]

Means for Solving the Problems To achieve the above object, an invention according to claim 1 is to provide a heat exchanger material obtained by bending a metal strip in a zigzag manner into a concentrically arranged cylindrical shape. A method for manufacturing a heat exchanger to be assembled between an inner case and a cylindrical outer case having a larger diameter than the inner case, wherein the inner case is held by an inner case holding jig and the outer case is held by an outer case holding jig. A first step of forming an annular space between the two cases, a second step of shaping the heat exchanger material into an annular shape and gripping the same with a clamp member, and a heat exchange gripped by the clamp member. A third step of inserting a container material into the annular space and integrating the inner material with the inner case and the outer case.

[0008] According to the above configuration, the heat exchanger material, whose shape is difficult to determine, is annularly gripped by the clamp member and inserted into the annular space between the inner case and the outer case. It can be carried out.
Moreover, since the outer case can be formed in a cylindrical shape in advance, the strength of the joint can be increased as compared with a case where the outer case is wound around the outer periphery of the heat exchanger material and both ends are joined.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, in the second step, a curved heat exchanger material is used before the heat exchanger material is gripped by the clamp member. It is characterized in that it is compressed radially inward and shaped into an annular shape.

According to the above configuration, it is possible to compress the heat exchanger material, whose shape is hard to determine, inward in the radial direction and to adjust the shape into a correct annular shape.

According to a third aspect of the present invention, in addition to the configuration of the second aspect, the wire is wound radially around the outer periphery of the curved heat exchanger material and compressed radially inward. I do.

According to the above configuration, the heat exchanger material can be uniformly compressed inward in the radial direction by a simple operation of winding and squeezing a wire around the curved heat exchanger material. Note that the wire is not limited to a metal wire and includes a string and the like.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, in the second step, the plurality of clamp members arranged in the circumferential direction are moved inward in the radial direction, so that the heat exchanger is provided. It is characterized by gripping a material.

According to the above configuration, the shape of the heat exchanger material can be automatically adjusted to the correct annular shape by moving the plurality of clamp members arranged in the circumferential direction inward in the radial direction.

According to a fifth aspect of the present invention, in addition to the configuration of the first aspect, in the third step, the circle is formed by sliding the heat exchanger material held by the clamp member with respect to the clamp member. It is characterized by being inserted into an annular space.

According to the above construction, since the clamp member itself functions as a guide, not only can the heat exchanger material be smoothly inserted, but also the number of parts can be reduced since a special guide is not required. .

According to a sixth aspect of the present invention, in addition to the configuration of the first aspect, a single metal strip is bent in a zigzag shape to form a 360 ° annular heat exchanger material. It is characterized by.

According to the above-described structure, the number of joints between the ends of the metal strip can be minimized, and the possibility of air or combustion gas leakage can be reduced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIGS. 1 to 12 show an embodiment of the present invention. FIG. 1 is a plan view of a folded plate material shaping jig, and FIG.
3 is an enlarged sectional view taken along line 3-3 of FIG. 1;
4 is a longitudinal sectional view of the heat exchanger material holding jig, FIG. 5 is a view in the direction of arrow 5 in FIG. 4, FIG. 6 is an operation explanatory view corresponding to FIG.
8 is a side view of the heat exchanger material held by the heat exchanger material holding jig, FIG. 8 is a view taken in the direction of the arrow 8 in FIG. 7, and FIG. 9 is a diagram showing a state at the start of assembling the heat exchanger material. FIG. 10 is a diagram showing a state at the time of completion of the assembly of the heat exchanger material, FIG. 11 is a plan view of the completed heat exchanger, and FIG. 12 is a diagram showing the folded plate material and the heat exchanger material.

As shown in FIGS. 1 to 3, the heat exchanger shaping jig 30 of the heat exchanger assembling apparatus includes a cylindrical positioning ring 32 fixed to the center of a base member 31, and one end of the base member 31. A wire holding post 34 provided at the end of the base member 31 and one end of the two wires 33, 33 fixed thereto, and two wires 33, 33 provided at the other end of the base member 31.
And a wire winding device 35 for winding the other end of the wire. The wire winding device 35 includes a rotating shaft 38 supported by a pair of ball bearings 37, 37 inside a casing 36. The other ends of the wires 33, 33 are wound around the rotating shaft 38 a plurality of times. Fixed.
A worm 40 provided on a crankshaft 39 rotatably supported on an upper part of a casing 36 meshes with a worm wheel 41 provided on an upper part of the rotary shaft 38, and
When the user grips and rotates the knob 42 provided on the rotating shaft 9, the rotating shaft 38
Rotates and the wires 33, 33 are wound up.

The heat exchanger material 3 obtained by winding the folded plate material 1 into a zigzag shape is wound around the outer periphery of the positioning ring 32, and two wires 33, 33 are further wound around the outer periphery of the positioning ring 32. When the winding devices 35 wind the wires 33, 33, the heat exchanger material 3 is compressed radially inward and pressed against the outer periphery of the positioning ring 32. Thereafter, when the wires 33, 33 are loosened and the heat exchanger material 3 is removed from the heat exchanger shaping jig 30, the heat exchanger material 3 slightly returns outward in the radial direction in an attempt to return to its original shape by its own elasticity. Although it spreads, it is generally arranged in an annular shape, so that the work in the next step can be facilitated.

As shown in FIGS. 4 and 5, the heat exchanger material holding jig 10 of the heat exchanger assembling apparatus includes a plate-shaped base member 11 formed in a circular shape. A circular end surface positioning plate 12 is provided concentrically on the upper surface of the base member 11, and six brackets 13 are erected at 60 ° intervals so as to surround the periphery of the end surface positioning plate 12. Each of the brackets 13 supports four guide bolts 14 slidable in the radial direction. The tips of the guide bolts 14 are screwed into the clamp members 15 and are directed radially inward into the brackets 13. 4 screwed into
The tips of the tightening bolts 16 contact the outer surface of the clamp member 15. Therefore, the clamping members 15 guided by the guide bolts 14 can be moved radially inward by tightening the fastening bolts 16.

Both ends of the clamp member 15 in the circumferential direction are mutually
Positioning surface 15 that can be in close contact with ₁, 15_TwoFormed
It is. In addition, approximately 60
Arc-shaped clamping surface 15 having a central angle of °_ThreeFormed
It is. Move the clamp member 15 inward in the radial direction to
Positioning surfaces 15 facing each other₁, 15_TwoClose contact
The clamping surfaces 15 of the six clamping members 15.
_ThreeAre connected in a circle as a whole.

As is apparent from FIGS. 7 and 8, the positioning surfaces 15 ₁ , 1 of each clamp member 15 are evident.
In a state where 5 ₂ are in close contact, they positioning surfaces 15 _1, 15
_The flat plate-shaped connecting member 17 is brought into contact with the connecting surfaces 15 ₄ and 15 ₅ formed adjacent to the _second member 2 and fastened with bolts 18. . In this state, if the guide bolts 14 and the tightening bolts 16 are loosened, the heat exchanger material 3 held by the six clamp members 15 can be removed from the brackets 13.

As shown in FIG. 9, the inner case holding jig 19 of the heat exchanger assembling apparatus comprises a cylindrical lower half 20 and an upper half 21 having the same outer diameter.
The lower half 20 is fixed to the upper surface of the base member 22, and the upper half 21 is separated from the lower half 20. A stepped portion 2 having the same height as the thickness of the inner case 4 is provided on the upper outer peripheral surface of the lower half 20 and the lower outer peripheral surface of the upper half 21.
0 ₁ and 21 ₁ are formed, and these steps 20 ₁ and 2 ₁ are formed.
By respectively engaging the lower edge and the upper edge of the inner case 4 to 1 _1, the lower half 20, the inner case 4 and the upper half body 21 is coupled coaxially. Incidentally, the inner case 4 is curved strip-shaped stainless steel plate into a cylindrical shape, it is previously joined to the opposite ends by welding W ₁ (see FIG. 11).

Similarly, the outer case holding jig 23 of the heat exchanger assembling apparatus comprises a cylindrical lower half 24 and an upper half 25 having the same outer diameter. Lower half 2
4 is fixed to the upper surface of the base member 22, and the upper half 25 is separated from the lower half 24. Steps 24 ₁ , 25 ₁ having the same height as the thickness of the outer case 5 are provided on the upper inner peripheral surface of the lower half 24 and the lower inner peripheral surface of the upper half 25.
The lower half 24, the outer case 5 and the upper half 25 are coaxially connected to each other by locking the lower edge and the upper edge of the outer case 5 to the steps 24 ₁ and 25 ₁ respectively. Is done. Incidentally, the outer case 5 is curved strip-shaped stainless steel plate into a cylindrical shape, it is previously welded W ₂ both ends thereof (see FIG. 11). The upper inner peripheral surface of the upper half 25, an inner diameter guide surface 25 ₂ is formed so as to gradually increases upward. Radius R ₁ of the inner peripheral surface of the lower half 24 and upper half 25 is formed smaller by predetermined interference α than the radius R ₂ of the clamping surface 15 ₃ of the clamping member 15.

Thus, the inner case 4 and the outer case holding jig 2 held by the inner case holding jig 19
An annular space 26 having substantially the same shape as the heat exchanger material 3 is formed between the outer case 5 and the outer case 5 held by the outer case 5.

Next, the manufacturing process of the heat exchanger will be described.

First, the heat exchanger material 3 shown in FIG.
Is set so as to surround the outer circumference of the positioning ring 32 of the heat exchanger shaping jig 30 of the heat exchanger assembling apparatus in a state where the wire 33 and the two wires 33,
33 is wound. Subsequently, by tightening the wires 33, 33 with the wire winding device 35, the heat exchanger material 3 is compressed radially inward and pressed against the outer periphery of the positioning ring 32. Thereby, the heat exchanger material 3 which is going to return to the original shape by its own elasticity can be provided and formed into a substantially annular shape as a whole.

Next, the lower edges of the inner case 4 and the outer case 5, which have been formed into a cylindrical shape in advance by welding both ends of the belt-shaped stainless steel plate, are joined to the lower half of the inner case holding jig 19 and the outer case holding jig 23. The upper half 2 of the inner case holding jig 19 and the outer case holding jig 23 is fixed to the steps 20 ₁ , 24 ₁ of the bodies 20, 24, and on the upper edges of the inner case 4 and the outer case 5.
The steps 21 ₁ and 25 ₁ of the _first and the second 25 are locked. as a result,
As shown in FIG. 9 , an annular space 26 is formed between the outer peripheral surface of the inner case 4 and the inner peripheral surface of the outer case 5.

Subsequently, while the six clamp members 15 of the heat exchanger material holding jig 10 are moved outward in the radial direction, heat exchange is performed on the inside of the clamp surfaces 15 ₃ of the clamp members 15. The substantially annular heat exchanger material 3 removed from the shaping jig 30 is set. At this time, one end surface of the heat exchanger material 3 comes into contact with the end surface positioning plate 12 and is positioned. From this state, tightening bolts 16 ...
To rotate each clamp member 15 to its positioning surface 15.
_1, 15 ₂ When moved radially inwardly to a position abutting each other, the heat exchanger elements 3 are clamping member 1 state after being compressed radially inward to the state of FIG. 5 six 6
5 ...

Subsequently, the connecting member 17 is brought into contact with the connecting surfaces 15 ₄ and 15 ₅ of the adjacent clamp members 15 so that the bolt 1
8 to form six clamp members 15.
Are integrated. Six integrated clamp members 15 ...
And the heat exchanger material 3 held by them can be removed from the brackets 13 by loosening the guide bolts 14 and the tightening bolts 16 (FIG. 7).
And FIG. 8).

Subsequently, as shown in FIG. 9, the clamp members 15 holding the heat exchanger material 3 are concentrically superimposed on the upper surface of the outer case holding jig 23, so that the heat is generated above the annular space 26. Position the exchanger blank 3. When a load indicated by an arrow A is applied to the heat exchanger material 3 and pressed downward, the heat exchanger material 3 descends while its outer peripheral surface is guided by the clamp surfaces 15 ₃ ... Of the clamp members 15. As shown, it is smoothly inserted into the annular space 26 between the inner case 4 and the outer case 5. In this case, the radius R ₁ of the inner peripheral surface of the lower half 24 and upper half 25 of the outer case holding jig 23 is smaller by a predetermined interference α than the radius R ₂ of the clamping surface 15 ₃ of the clamping member 15 Because of this, the heat exchanger material 3 is further compressed inward in the radial direction by the amount of the interference during the insertion.

Subsequently, the clamp members 15 which have released the gripping of the heat exchanger material 3 are separated upward, and the upper half bodies 21 and 25 of the inner case holding jig 19 and the outer case holding jig 23 are subjected to heat exchange. After being pulled upward from the container material 3, the heat exchanger in which the heat exchanger material 3 is integrated with the inner case 4 and the outer case 5 is connected to the lower half 20 of the inner case holding jig 19 and the outer case holding jig 23, 24 can be withdrawn upwards. Thus,
A heat exchanger is completed by joining the heat exchanger material 3 to the inner case 4 and the outer case 5 by brazing.

As described above, since the heat exchanger material 3 whose shape is difficult to determine is gripped by the clamp members 15 and inserted between the inner case 4 and the outer case 5, the insertion operation can be completed easily and reliably. be able to.
In addition, since the heat exchanger material 3 is slid using the clamp surfaces 15 ₃ of the clamp members 15 as guides at the time of the insertion, no special guide is required, and the structure of the heat exchanger material holding jig 10 is simplified. Is done. In addition, the clamp member 15
Can be moved inward in the radial direction by the tightening bolts 16, so that the heat exchanger material 3 that is to be spread outward by its own elasticity is uniformly tightened inward, and its shape is adjusted to an accurate annular shape and gripped. can do.

Further, the outer case 5 is previously welded W
₂ (see FIG. 11), the heat exchanger material 3 can be assembled without any trouble even if it is formed in a cylindrical shape, so that both ends of the outer case 5 need not be overlapped and brazed (see FIG. 11). 14 (C)), it is possible to secure a sufficient bonding strength and to prevent cracks in the bonding portion due to thermal stress.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, in the embodiment, an annular heat exchanger material 3 extending from one folded plate material 1 to 360 ° is formed, but a plurality of heat exchangers having a central angle of 90 ° or 60 ° are formed. A plurality of materials may be combined. However, if the annular heat exchanger material 3 extending over 360 ° is formed integrally, the possibility of air or combustion gas leaks can be minimized because the number of joints due to brazing is reduced. .

[0040]

As described above, according to the first aspect of the present invention, the heat exchanger material, whose shape is difficult to determine, is annularly gripped by the clamp member and is formed in the annular space between the inner case and the outer case. Since the insertion is performed, the insertion operation can be performed easily and reliably. Moreover, since the outer case can be formed in a cylindrical shape in advance, the strength of the joint can be increased as compared with a case where the outer case is wound around the outer periphery of the heat exchanger material and both ends are joined.

According to the invention described in claim 2,
The heat exchanger material, whose shape is difficult to determine, can be compressed inward in the radial direction, and its shape can be adjusted to the correct annular shape.

According to the invention described in claim 3,
The heat exchanger material can be uniformly compressed inward in the radial direction by a simple operation of winding and squeezing the wire around the outer periphery of the curved heat exchanger material.

According to the fourth aspect of the present invention,
By moving the plurality of clamp members arranged in the circumferential direction inward in the radial direction, the shape of the heat exchanger material can be automatically adjusted to the correct annular shape.

According to the invention described in claim 5,
Since the clamp member itself functions as a guide, not only can the heat exchanger material be inserted smoothly,
Since a special guide is not required, the number of parts is reduced.

According to the invention described in claim 6,
The joints between the ends of the metal strip can be minimized, and the possibility of air or combustion gas leaks can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a folding plate material shaping jig.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is a longitudinal sectional view of a heat exchanger material holding jig.

FIG. 5 is a view in the direction of arrows in FIG. 4;

FIG. 6 is an operation explanatory view corresponding to FIG. 5;

FIG. 7 is a side view of the heat exchanger material held by the heat exchanger material holding jig;

8 is a view taken in the direction of an arrow 8 in FIG. 7;

FIG. 9 is a diagram showing a state at the start of assembling the heat exchanger material.

FIG. 10 is a diagram showing a state at the time of completion of assembly of the heat exchanger material.

FIG. 11 is a plan view of a completed heat exchanger.

FIG. 12 is a view showing a folded plate material and a heat exchanger material.

FIG. 13 is a diagram showing a first conventional example of a method for manufacturing a heat exchanger.

FIG. 14 is a diagram showing a second conventional example of a method for manufacturing a heat exchanger.

[Explanation of symbols]

 Reference Signs List 1 folded plate material (metal strip) 3 heat exchanger material 4 inner case 5 outer case 15 clamp member 19 inner case holding jig 23 outer case holding jig 26 annular space 33 wire

Continued on front page (72) Inventor Tadashi Tsunoda 1-4-1, Chuo, Wako-shi, Saitama Pref. Inside Honda R & D Co., Ltd.

Claims (6)

[Claims] A heat exchanger material (3) obtained by bending a metal strip (1) in a zigzag manner is formed by concentrically disposing a cylindrical inner case (4) and a larger diameter than the inner case (4). A method of manufacturing a heat exchanger to be assembled between the outer case holding jig (2) and the outer case holding jig (2).
The first step of forming an annular space (26) between the two cases (4, 5) by holding the outer case (5) in 3), and shaping the heat exchanger material (3) into an annular shape. A second step in which the heat exchanger material (3) gripped by the clamp member (15) is inserted into the annular space (26) and an inner case (4) and an outer case are gripped by the clamp member (15). (5) and a third step of integrating the heat exchanger with the heat exchanger. 2. In the second step, prior to gripping the heat exchanger material (3) by the clamp member (15),
The method for producing a heat exchanger according to claim 1, wherein the curved heat exchanger material (3) is radially inwardly compressed and shaped into an annular shape. 3. The heat exchanger according to claim 2, wherein a wire (33) is wound around the outer periphery of the curved heat exchanger material (3) and compressed radially inward by squeezing. Production method. 4. The heat exchanger material according to claim 2, wherein in the second step, a plurality of circumferentially arranged clamp members are moved radially inward to grip the heat exchanger material. 2. The method for producing a heat exchanger according to item 1. 5. In the third step, the heat exchanger material (3) gripped by the clamp member (15) is inserted into the annular space (26) while sliding with respect to the clamp member (15). The method for manufacturing a heat exchanger according to claim 1, wherein: 6. An annular heat exchanger material (3) which is formed by bending one metal strip (1) in a zigzag manner and extending over 360 °.
The method for manufacturing a heat exchanger according to claim 1, wherein