JP2012127618A - Method for producing baffle plate in heat exchanger and method for fabricating heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a baffle plate, which does not cause burrs, strain, cracks or the like even when a distance between heat transfer tubes is shortened, and which can keep a gap, between holes, constant.SOLUTION: The multi-tube type heat exchanger 1 includes a plurality of heat transfer tubes 2 for causing first fluid as an object of heat exchange to flow through the inside of the heat transfer tubes, headers 5 disposed on both end sides of the heat transfer tubes 2, and baffle plates 3 attached to outer circumferential parts of the heat transfer tubes 2, wherein, when the baffle plates 3 are produced, a plurality of ring-shaped ring members 31a, in which the heat transfer tubes 2 can be inserted, are formed, the plurality of formed ring members 31a are arranged, and gaps among the ring members 31a are filled with brazing material 32 to form the baffle plate 3. Alternatively, sheath pipes 31, in which the heat transfer tubes 2 can be inserted, are arranged side by side and are brazed, and the baffle plate 3 is formed by cutting the sheath pipes in the direction intersecting the axes of the sheath pipes.

Description

  The present invention relates to a method of manufacturing a baffle plate attached to a heat transfer tube of a heat exchanger, and more specifically, even when the distance between the heat transfer tube and the heat transfer tube is shortened, according to the distance. The present invention relates to a method of manufacturing a baffle plate that is formed with an accurate hole so that it can be inserted into a heat transfer tube.

  Generally, as shown in FIG. 7, the multi-tube heat exchanger includes headers 6L and 6R provided on the left and right sides, a plurality of heat transfer tubes 2 provided between the headers 6L and 6R, and these And a shell 4 that accommodates the heat transfer tube 2. And when exchanging heat with the 1st fluid used as the object of heat exchange, while letting the 1st fluid flow in into heat exchanger tube 2 via header 6L, it is in the body space S enclosed by shell 4 The second fluid is passed through, and heat exchange with the first fluid is performed through the outer peripheral portion of the heat transfer tube 2.

  In such a configuration, in order to meander the second fluid in the in-cylinder space, the baffle plates 7 are alternately arranged up and down to meander the second fluid as shown in FIG. (Patent Document 1), a ring-shaped baffle plate inscribed in the shell (not shown) and a circular baffle plate corresponding to the ring-shaped hollow portion are alternately arranged to meander the second fluid. There is something like that.

JP 2002-310577 A Special Table 2002-525552

  By the way, when manufacturing such a baffle plate, generally, a hole for inserting a heat transfer tube into a thin plate is formed using a drill or a punch, but if a drill or punch is used, a burr is formed around the hole. If the burr is generated and deformed inward, the inner diameter becomes narrow and the heat transfer tube cannot be passed.

  Also, in order to pass more first fluid, it is necessary to increase the number of heat transfer tubes, but if the gap between the holes of the baffle plate is reduced, the thin plate will be distorted or cracked, There is a possibility that a gap is formed between the heat transfer tube and the second fluid leaks from there.

  Furthermore, when forming a hole in the baffle plate, the hole must be formed by setting the distance between the heat transfer tube and the heat transfer tube. However, there is a problem that it takes time to set the distance and to make the hole. .

  Therefore, the present invention has been made paying attention to the above problems, and even when the distance between the heat transfer tube and the heat transfer tube is shortened, it does not cause burrs, distortion, cracks, etc. It is an object of the present invention to provide a baffle plate manufacturing method capable of keeping the gap constant.

  That is, in order to solve the above-mentioned problems, the present invention provides a plurality of heat transfer tubes that allow the first fluid to be heat exchanged to flow inside, headers provided on both ends of the heat transfer tubes, and the heat transfer tubes. In the baffle plate manufacturing method in the heat exchanger provided with baffle plates attached to the outer peripheral portion of the plurality of ring-shaped ring members into which the heat transfer tubes can be inserted, and a plurality of the formed baffle plates And a step of forming a baffle plate by filling a gap between the ring member and the ring member.

  In this way, if a plurality of ring members into which the heat transfer tubes can be inserted are prepared, the ring members are arranged in a plane, and then the baffle between each ring member is brazed to form a baffle plate Thus, it is not necessary to drill a thin plate with a drill or punch as in the prior art, and burrs, distortions and cracks are not generated. Further, if the gaps are filled with the ring members in close contact with each other, the gaps between the heat transfer tubes can be set uniformly by the thickness of the ring members.

  Further, in another invention, a step of forming a plurality of sheath tubes into which heat transfer tubes can be inserted, a step of bundling the plurality of formed sheath tubes, filling a gap between the sheath tubes and the sheath tubes, and filling the holes The plurality of sheathed tubes can be cut across the axis of the sheath tube to form a baffle plate.

  In this way, a large number of baffle plates can be formed at a time by cutting a plurality of sheath tubes filled in holes.

  In such an invention, a gap insertion member may be disposed in the gap between the sheath tube and the sheath tube, and then the gap between the sheath tube and the sheath tube may be filled.

  In this way, the gap insertion member can reduce the gap between the sheath tubes and reduce the amount of brazing material, and the gap insertion member can be used to penetrate the brazing material deep into the sheath tube by capillary action. Will be able to.

  According to the present invention, a plurality of ring members into which heat transfer tubes can be inserted are prepared. After arranging the ring members in a planar shape, the gaps between the ring members are brazed to form baffle plates. In this case, it is not necessary to drill a thin plate with a drill or punch as in the prior art, and burrs, distortions, and cracks do not occur. Further, if the gaps are filled with the ring members in close contact with each other, the gaps between the heat transfer tubes can be set uniformly by the thickness of the ring members.

Schematic of a multi-tube heat exchanger in one embodiment of the present invention The perspective view which shows the baffle plate in the same form, a heat exchanger tube, and a shell The schematic perspective view which shows the baffle plate in the same form The figure which shows the manufacturing process of the baffle plate in the same form The figure which shows the manufacturing process of the baffle plate in other embodiment. The figure which shows the tool for inserting the heat transfer tube Schematic of multi-tube heat exchanger in the conventional example

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the multi-tube heat exchanger 1 in this embodiment is provided with headers 5 including partition plates 53 on both sides of the heat transfer tube 2, and the first fluid flows into and out of the heat transfer tube 2. The first fluid flowing in the heat transfer tube 2 is brought into contact with the second fluid from the outside of the heat transfer tube 2 to exchange heat with the first fluid. A plurality of baffle plates 3 are alternately arranged in the in-body space S surrounded by 4. And, characteristically, as shown in FIG. 3, the baffle plate 3 is composed of a plurality of ring members 31a and a brazing material 32 that brazes each gap when the ring members 31a are in close contact with each other. The heat transfer tube 2 can be inserted and fixed in the hole of the ring member 31a of the baffle plate 3. Hereinafter, the structure of the multi-tube heat exchanger 1 in this embodiment and the manufacturing method of the baffle plate 3 used for it are demonstrated.

  First, the heat transfer tube 2 in the multi-tube heat exchanger 1 is composed of a metal pipe having a high thermal conductivity that allows the first fluid to pass inside. It is composed of a very thin pipe with an inner diameter of about 1.3 mm. As shown in FIG. 1, the center portion of the heat transfer tube 2 is provided in the interior space S sealed by the partition plate 53 and the shell 4 of the header 5, while the left and right end portions are A partition plate 53 that partitions the header 5 and the in-body space S is attached. A second inflow portion 43 for allowing the second fluid to flow in is provided at the upper portion of the shell 4, and a second discharge portion 44 is provided at the lower portion on the other end side to discharge the second fluid therefrom. I am doing so. The shell 4 may be formed in a cylindrical body that allows the bundled heat transfer tubes 2 to be inserted in the axial direction, or, as shown in FIG. 2, a body element 41a divided along the longitudinal direction. , 41b may be opposed and welded. When the body elements 41a and 41b are welded, a semicircular cutout portion 42 for attaching the second inflow portion 43 and the second discharge portion 44 shown in FIG. The cylindrical second inflow portion 43 and the second discharge portion 44 can be brazed to the notch portion 42. Similarly, the part inscribed in the partition plate 53 is brazed so that the first fluid and the second fluid do not leak.

  On the other hand, the header 5 allows the first fluid to flow into the heat transfer tube 2 inserted into the hole of the partition plate 53 and discharges the first fluid on the other end side. In order to allow the first fluid to be heat exchanged to flow in, a first inflow portion 51 through which the first fluid can flow is provided on one header 5 side, and the other header 5 side is provided. The first discharge part 52 that discharges the second fluid is provided and can be discharged therefrom.

  In such a configuration, the baffle plate 3 is attached to the heat transfer tube 2 in the in-cylinder space S and allows the heat of the heat transfer tube 2 to diffuse and the second fluid that has flowed into the in-cylinder space S to meander. It is comprised so that an action may be taken.

  First, as shown in FIG. 3, the baffle plate 3 is provided with a plurality of ring-shaped ring members 31a into which the heat transfer tubes 2 can be inserted, and these ring members 31a are arranged in close contact with each other in a plane. In this state, each gap (that is, the gap between the ring member 31a and the ring member 31a) is brazed. The ring member 31a is made of a metal member having an outer diameter of about 2.0 mm and an inner diameter of about 1.6 mm (wall thickness is 0.4 mm). It is set to be thin enough to withstand the pressure when the fluid can meander. Here, as the brazing material 32 for brazing, a material containing a powder of silver, aluminum, phosphor copper, lead, or the like is used, and this is enclosed in a gap between the ring members 31a and heated to heat the ring member 31a. The gap is sealed. Since this brazing material 32 is relatively expensive, as shown in FIG. 3, a wire 33 such as a wire (in FIG. 3, the wire 33 is inserted in a substantially triangular gap between the ring member 31a and the ring member 31a. The brazing material 32 may be injected in a state in which the gap space is reduced. At this time, the wire 33 may be thin enough to be inserted into the gap with the ring members 31a in close contact with each other, or when it is desired to widen the gap between the ring members 31a. The wire 33 may be thickened to widen the gaps between the ring members 31a.

  Next, the manufacturing method of the baffle plate 3 comprised in this way is demonstrated using FIG.4 and FIG.5.

  When the baffle plate 3 is manufactured, first, a plurality of sheath tubes 31 into which the heat transfer tubes 2 can be inserted are prepared, and a circular shape that fits in the shell 4 in a state where the sheath tubes 31 are in close contact with each other. Bundle them together. When the sheath tubes 31 are bundled, the second-row sheath tubes 31 are accommodated in the valleys of the first-row sheath tubes 31 arranged in close contact with each other. (FIG. 4 (a)).

  Next, the sheathed tube 31 bundled in this way is surrounded by a cylindrical body 35 corresponding to the size of the shell 4, and the brazing material 32 is inserted into the gap between each sheathed tube 31 and the sheathed tube 31 or between the tubular body 35. Inject. At this time, the brazing material 32 can be injected by inserting the wire material 33 into the gap as necessary. When the wire 33 is inserted, the amount of the brazing material 32 can be reduced, and the brazing material 32 can be penetrated into the gap between the sheaths by capillary action along the wire 33. In addition, the wire 33 is abbreviate | omitted in FIG. Then, after the brazing material 32 is injected in this way, the brazing material 32 is melted and filled with high heat to form a bundle of circular sheath tubes 31 as a whole (FIG. 4B).

  After forming a bundle of sheath tubes 31 in this way, a plurality of marks 34 along the axial direction are put on the side surfaces, and the bundle of sheath tubes 31 is cut in a direction crossing the axis (preferably at a right angle). (FIG. 4 (c)). And this is cut | disconnected in a substantially semicircle shape, and the baffle plate 3 is formed (FIG.4 (d)).

  In addition, instead of cutting after filling the gap or the like with the brazing material 32 in this way, as shown in FIG. 5, the bundle of sheath tubes 31 previously bundled (FIG. 5A) crosses the axis. Then, the ring members 31a obtained by the cutting are arranged in a plane and surrounded by the cylindrical body 35, and the gaps are brazed (FIG. 5 (c)). When brazing is performed after first cutting in this manner, there is an advantage that the brazing material 32 can be reliably injected into the gap. On the other hand, if the method of cutting after brazing the whole like the former is used, there exists an advantage that the arrangement state of each sheath tube 31 will not collapse in a cutting process. For this reason, it is preferable to select and use any of the merits as appropriate for selecting one of these manufacturing methods.

  Then, the baffle plate 3 brazed in a circular shape is cut into a substantially semicircular shape (FIG. 5D) to form the baffle plate 3 for allowing the second fluid to meander. Here, after the baffle plate 3 is formed in a circular shape, it is cut into a semicircular shape, but the sheath tube 31 is bundled in a semicircular shape and surrounded by a semicylindrical cylindrical body 35, and then Each gap may be brazed. Here, the case where the semicircular baffle plate 3 is formed will be described. However, the ring-shaped baffle plate 3 and the circular baffle plate 3 corresponding to the hollow portion may be formed. Alternatively, it may be formed to have another shape.

  And the heat exchanger tube 2 is inserted in the baffle plate 3 comprised in this way (FIG. 2 and FIG. 3). When the heat transfer tube 2 is passed through the baffle plate 3, first, a plurality of baffle plates 3 are overlapped with the marks 34 provided on the side surfaces of the baffle plate 3, and the heat transfer tube 2 is attached to the ring member of the baffle plate 3 in this state. Pass inside 31a.

  At this time, since it takes time to pass the heat transfer tube 2 through the thin sheath tube 31, the heat transfer tube 2 can be inserted into the sheath tube 31 using a jig 36 as shown in FIG. May be. The jig 36 has substantially the same outer diameter as that of the sheath tube 31 and the inner diameter increases as it goes upward. It is a brazed one. And by making the outer diameter dimension the same in this way, the same arrangement state as the cut sheath tube 31 is made, and the heat transfer tube 2 is inserted from the upper part having a larger inner diameter dimension, thereby finally The lowermost sheath tube 31 can be inserted.

  Then, after passing through the heat transfer tubes 2 in this way, the respective baffle plates 3 are arranged at regular intervals (FIG. 2), and the respective baffle plates 3 are brazed to the heat transfer tubes 2. As a result, the gaps between the heat transfer tubes 2 are unified with the thickness of the ring member 31a. By using the thin ring member 31a, the gaps between the heat transfer tubes 2 can be reduced and a large number of heat transfer tubes 2 can be transferred. The heat tube 2 can be attached.

  As described above, according to the embodiment described above, a plurality of ring members 31a into which the heat transfer tubes 2 can be inserted are prepared, and the ring members 31a are arranged in a plane and the gaps between the ring members 31a. Since the baffle plate 3 is formed by brazing, it is not necessary to perforate the thin plate using a drill or a punch as in the prior art, and burrs, distortions and cracks do not occur. Further, if the gaps are filled with the ring members 31a in close contact with each other, the gaps between the heat transfer tubes 2 can be set uniformly by the thickness of the ring members 31a.

  Moreover, since the wire rod 33 which is a gap insertion member is arranged in the gap between the sheath tube 31 and the sheath tube 31 and then the gap between the sheath tube 31 and the sheath tube 31 is filled, the sheath insertion member is covered by the gap insertion member. The gap between the tubes 31 can be reduced to reduce the amount of the brazing material 32, and the brazing material 32 can be penetrated deep into the sheath tube 31 by a capillary phenomenon using the gap insertion member.

  In addition, this invention can be implemented in various aspects, without being limited to the said embodiment.

  For example, in the above-described embodiment, the case where the baffle plate 3 is attached to the multi-tube heat exchanger 1 having the headers 5 on the left and right sides has been described. However, the long heat transfer tube 2 is bent in a U shape to be inflow side. A baffle plate may be attached to the multi-tube heat exchanger 1 in which the header 5 and the discharge-side header 5 are vertically adjacent to each other.

  In the above embodiment, the ring member 31a has a circular outer shape. However, the outer shape may be a rectangular shape. For example, when the ring member 31a having a rectangular shape is used, when the ring members 31a are brought into close contact with each other, the respective gaps come into close contact with each other, so that it can be welded with almost no brazing material 32 used. There are benefits.

  Furthermore, in the said embodiment, although the cross section used the circular thing as the heat exchanger tube 2, the cross section may make a rectangular shape or flat shape. At this time, as for the ring member 31a and the sheath tube 31, a member that can be inscribed in the heat transfer tube 2 having a rectangular shape or a flat shape may be used.

DESCRIPTION OF SYMBOLS 1 ... Multi-tube heat exchanger 2 ... Heat transfer tube 3 ... Baffle plate 31 ... Sheath pipe 31a ... Ring member 32 ... Brazing material 33 ... Wire material 34 ... Mark 35 ... cylindrical body 36 ... jig 4 ... shell 40 ... internal space 41a, 41b ... body element 42 ... notch 43 ... second inflow part 44 ... .... Second discharge part 5 ... Header 51 ... First inflow part 52 ... First discharge part 53 ... Partition plate

Claims (5)

A plurality of heat transfer tubes that circulate a first fluid to be heat exchanged therein, headers provided at both ends of the heat transfer tubes, and baffle plates attached to the outer peripheral portion of the heat transfer tubes In the manufacturing method of the baffle plate in the heat exchanger,
Forming a plurality of ring-shaped ring members into which the heat transfer tubes can be inserted; and
Arranging a plurality of the formed ring members, filling a gap between the ring member and the ring member to form a baffle plate;
A baffle plate manufacturing method characterized by comprising: A plurality of heat transfer tubes that circulate a first fluid to be heat exchanged therein, headers provided at both ends of the heat transfer tubes, and baffle plates attached to the outer peripheral portion of the heat transfer tubes In the manufacturing method of the baffle plate in the heat exchanger,
Forming a plurality of sheath tubes into which the heat transfer tubes can be inserted;
Bundling the formed plurality of sheath tubes, filling the gap between the sheath tubes and the sheath tubes,
Cutting the plurality of sheathed tubes filled in the hole so as to cross the axis of the sheath tube to form a baffle plate; and
A baffle plate manufacturing method characterized by comprising:   The manufacturing method of the baffle plate of Claim 2 which arrange | positioned the clearance gap insertion member in the clearance gap between the said sheath pipes, and filled up the clearance gap between a sheath pipe and a sheath pipe after that. A plurality of heat transfer tubes that circulate a first fluid to be heat exchanged therein, headers provided at both ends of the heat transfer tubes, and baffle plates attached to the outer peripheral portion of the heat transfer tubes In the method of manufacturing a heat exchanger,
Forming a plurality of ring-shaped ring members into which the heat transfer tubes can be inserted; and
Arranging a plurality of the formed ring members, filling a gap between the ring member and the ring member to form a baffle plate;
Fixing the baffle plate through a heat transfer tube;
A method of manufacturing a heat exchanger, comprising: A plurality of heat transfer tubes that circulate a first fluid to be heat exchanged therein, headers provided at both ends of the heat transfer tubes, and baffle plates attached to the outer peripheral portion of the heat transfer tubes In the method of manufacturing a heat exchanger,
Forming a plurality of sheath tubes into which the heat transfer tubes can be inserted;
Bundling the formed plurality of sheath tubes, filling the gap between the sheath tubes and the sheath tubes,
Cutting the plurality of sheathed tubes filled in the hole so as to cross the axis of the sheath tube to form a baffle plate; and
Fixing the formed baffle plate through a heat transfer tube;
A method of manufacturing a heat exchanger, comprising:

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