WO2013005333A1

WO2013005333A1 - Multitubular heat exchanger manufacturing method, and multitubular heat exchanger

Info

Publication number: WO2013005333A1
Application number: PCT/JP2011/065627
Authority: WO
Inventors: 谷川茂利
Original assignee: 株式会社Cku; シーアイ化成株式会社
Priority date: 2011-07-07
Filing date: 2011-07-07
Publication date: 2013-01-10

Abstract

[Problem] To provide as many heat exchanger tubes as possible and to make the gaps between the heat transfer tubes constant by devising a partition plate of a multitubular heat exchanger. [Solution] A manufacturing method of a multitubular heat exchanger (1) provided with multiple heat transfer tubes (2) for circulating a first fluid, a partition plate (3) provided at both ends of the heat transfer tubes (2), a chamber (40) enclosed by left and right partition plates (3), and a header (50) provided from the left and right partition plates (3) on the end side of the heat transfer tubes (2), wherein tubes (31), into which the heat transfer tubes (2) can be inserted, are bundled and cut, and multiple ring members (31a) are provided. Then, brazing material (32) is injected into gaps of said ring members (31a) and brazing is performed, and thereafter, the heat transfer tubes (2) are inserted into the ring members (31a) to fill in the gaps, forming the partition plate (3).

Description

Manufacturing method of multitubular heat exchanger and multitubular heat exchanger

The present invention relates to a heat exchanger that allows a second fluid to flow around the outer periphery of a plurality of heat transfer tubes so that heat exchange can be performed with the first fluid flowing through the heat transfer tubes. The present invention relates to a heat exchanger in which a large number of heat transfer tubes can be provided by devising a partition plate provided between headers and the gaps between the heat transfer tubes can be made uniform.

Conventionally, a multi-tube heat exchanger (shell-and-tube heat exchanger) has been proposed as a heat exchanger for cooling a fluid flowing in a heat transfer tube (see Patent Document 1 to Patent Document 4). .

The general structure of this multitubular heat exchanger will be described with reference to FIG. In FIG. 7, reference numerals 91L and 91R are headers provided on the left and right sides, and reference numeral 92 is a heat transfer tube provided between the left and right headers 91L and 91R, which is the first fluid along the axial direction. It is intended to pass through. Partition plates 94 are provided at both ends of the heat transfer tube 92, and the left and right headers 91L and 91R are isolated by the partition plate 94. Reference numeral 93 denotes a chamber divided by left and right partition plates 94, and allows the second fluid to pass from the inlet 95 to the outlet 96. And when cooling the 1st fluid which passes the inside of the heat exchanger tube 92 using such a heat exchanger, the 1st fluid is made to flow in from one header 91L, and the other header 91R is passed through the heat exchanger tube 92. To the side. On the other hand, at the same time, the second fluid is introduced from the inlet 95 of the chamber 93, exchanges heat through the outer surface of the heat transfer tube 92, and is discharged from the outlet 96.

Japanese Patent Application Laid-Open No. 07-55378 Japanese Patent Application Laid-Open No. 07-133993 JP 2003-21478 A JP 2009-250443 A

By the way, when manufacturing such a multi-tube heat exchanger, it is generally manufactured by the following process.

First, when a multi-tube heat exchanger is manufactured, a plurality of heat transfer tubes are prepared, and holes for passing the heat transfer tubes through the partition plate are formed in accordance with the outer diameter of the heat transfer tubes. When forming this hole, the hole is formed so that as many heat transfer tubes as possible can be passed, and the gap between the heat transfer tube and the heat transfer tube can be made uniform. And after forming such a hole, the heat transfer tube is passed through the hole of the partition plate, the gap is welded or brazed, and this is inserted into a hollow casing or the like to insert the header space, inlet or outlet Attach etc.

However, when manufacturing a multi-tube heat exchanger in such a process, the following problems occur.

That is, in order to ensure the flow rate of the first fluid, it is necessary to provide as many heat transfer tubes as possible. However, if many holes for passing the heat transfer tubes are provided in the partition plate, The distance from the hole is shortened, and it becomes difficult to accurately form the hole due to burrs, distortion, or the like. Further, in order to keep the gap between each heat transfer tube constant, the position for drilling must be set in advance, which causes a problem that it takes time for the setting operation and the drilling operation.

Therefore, the present invention has been made paying attention to the above problems, and by devising the partition plate of the multi-tube heat exchanger, it is possible to provide as many heat transfer tubes as possible, and each heat transfer tube. It is an object of the present invention to provide a multitubular heat exchanger and a method for manufacturing the same, in which the gap between the heat transfer tube and the heat transfer tube can be made constant.

That is, in order to solve the above-mentioned problem, the present invention is surrounded by a plurality of heat transfer tubes through which the first fluid passes, a partition plate provided on both ends of the heat transfer tube, and left and right partition plates. In a method of manufacturing a multi-tube heat exchanger comprising a chamber and a header provided on an end side of the heat transfer tube, a plurality of ring members into which the heat transfer tube can be inserted are provided, and the ring A partition plate is formed by filling a gap between the member and the ring member, and the heat transfer tube is inserted into the formed partition plate to form a header and a chamber.

In this way, by brazing the ring member through the heat transfer tube, a hole making step is not required when creating the partition plate, and by passing the heat transfer tube through the partition plate arranged in close contact with the ring member. The gap between the heat transfer tubes can be made uniform. Further, by reducing the thicknesses of the inner and outer diameters of the ring member, the gap between the heat transfer tubes can be narrowed, and many heat transfer tubes can be attached.

In such an invention, a plurality of tubes into which heat transfer tubes can be inserted are prepared, a gap between the tubes is filled, and the filled tube is cut in a direction transverse to the axial direction to form a partition plate Form.

In this way, a large number of partition plates can be formed at a time by cutting the tube.

Alternatively, a plurality of tubes into which heat transfer tubes can be inserted are provided, the tubes are cut in a direction transverse to the axial direction to form a ring member, and a gap is formed between the ring member and the ring member to form a partition plate You can also do it.

Furthermore, when inserting heat transfer tubes into two partition plates, a mark is provided for matching the position of the ring member on each partition plate, and after aligning the marks, the two partition plates are overlapped to transmit the heat transfer tube. The heat pipe is inserted, and one partition plate is slid to the other end side of the heat transfer pipe.

In this way, for example, by cutting with a mark provided in advance, aligning the mark and inserting the heat transfer tube into the partition plate, the holes of the partition plate can be aligned and the heat transfer tube can be easily It can be inserted.

According to the present invention, a plurality of heat transfer tubes through which the first fluid passes, a partition plate provided on both ends of the heat transfer tube, a chamber surrounded by the left and right partition plates, and the heat transfer tube In the method of manufacturing a multi-tube heat exchanger provided with a header provided on the end side of the ring, a plurality of ring members into which the heat transfer tubes can be inserted are provided, and a gap between the ring member and the ring member is provided. Since the partition plate was formed by filling the hole, and the heat transfer tube was inserted into the formed partition plate to form the header and the chamber, the partition plate was created by brazing the ring member through the heat transfer tube The hole-drilling process at the time becomes unnecessary, and the gap between the heat transfer tubes can be made uniform by passing the heat transfer tubes through the partition plates arranged in close contact with the ring members. Further, by reducing the thicknesses of the inner and outer diameters of the ring member, the gap between the heat transfer tubes can be narrowed, and many heat transfer tubes can be attached.

Schematic of a multi-tube heat exchanger in one embodiment of the present invention The perspective view which shows the partition plate in the same form, a heat exchanger tube, and a trunk | drum The perspective view which shows the partition plate in the same form The figure which shows the manufacturing method of the partition plate in the same form The figure which shows the manufacturing method of the partition plate in other embodiment. The figure which shows the jig for inserting a heat exchanger 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 multitubular heat exchanger 1 in this embodiment is configured such that a second fluid is brought into contact with the first fluid flowing in the heat transfer tube 2 from the outside of the heat transfer tube 2. Heat exchange can be performed with the first fluid. The left and right headers 50 for passing the first fluid through the heat transfer tubes 2 and the chamber 40 partitioned by the left and right partition plates 3 An inflow portion 43 and a discharge portion 44 for allowing the second fluid to flow in and out are configured. Characteristically, the partition plate 3 is connected to a plurality of ring members 31a (see FIG. 3 and the like), and a brazing material 32 for enclosing gaps between the ring members 31a when the ring members 31a are brought into close contact with each other. The heat transfer tube 2 is inserted into the hole of the ring member 31a of the partition plate 3, and the gap is brazed. Hereinafter, the structure of the multi-tube heat exchanger 1 in this embodiment and the manufacturing method of the partition plate 3 will be described.

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. The central portion of the heat transfer tube 2 is provided in the chamber 40 sealed by the partition plate 3 and the body portion 4, while the left and right end portions are sealed by the partition plate 3 and the header cover 5. The header 50 is provided. Among these, about the trunk | drum 4, the inflow part 43 for making a 2nd fluid flow in is provided in the upper side of the one end side of the heat exchanger tube 2, and the lower side in the other end side of the heat exchanger tube 2 is provided. Is provided with a discharge portion 44 for discharging the second fluid. The body 4 may be a cylindrical body that can insert the bundled heat transfer tubes 2 in the axial direction, or, as shown in FIG. 2, the body element divided along the longitudinal direction. You may comprise so that 41a and 41b may be made to oppose and weld. In the case of welding the body elements 41a and 41b, a semicircular cutout portion 42 for attaching the inflow portion 43 and the discharge portion 44 is provided in advance, and the semicircular cutout portion 42 has a cylindrical shape. The inflow portion 43 and the discharge portion 44 are brazed. The contact portion with the partition plate 3 is brazed so that the first fluid and the second fluid do not leak.

On the other hand, the header 50 is for allowing the first fluid to flow into or out of the end portion of the heat transfer tube 2 protruding from the partition plate 3, and is provided with a hole for attaching the inflow portion 51 or the discharge portion 52. A tubular inflow portion 51 and a discharge portion 52 are attached to the holes. On the other side of the header 50, an opening for closing the space of the header 50 on the other side is provided by the circular partition plate 3, and the partition plate 3 is inscribed in the opening to be welded. I have to. In the present embodiment, the end of the heat transfer tube 2 is projected from the partition plate 3, but the end of the heat transfer tube 2 and the surface of the partition plate 3 may be flush with each other. Good.

And in such a structure, the partition plate 3 plays the role which partitions off the header 50 and the chamber 40, and plays the role which forms a clearance gap uniformly in the state which made the clearance gap between each heat exchanger tube 2 small. It is structured as follows.

First, as shown in FIG. 3, the partition plate 3 is provided with a ring member 31a that can be inserted in a state in which the heat transfer tube 2 is inscribed. (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 (diameter) of about 2.0 mm and an inner diameter (diameter) of about 1.6 mm (thickness is 0.2 mm), and has an axial thickness. Is set to a thickness dimension having a welding allowance that can withstand the pressure of the chamber 40 or the header 50 and can weld the body 4 and the header cover 5 to the periphery. Here, as the brazing material 32 for brazing, a material containing powder of silver, aluminum, phosphor copper, lead, or the like is used, and the gap can be enclosed by enclosing it in the gap of the ring member 31a and heating. I am doing so. When this brazing material 32 is put into the gap of the ring member 31a, for example, a disk-shaped brazing material having holes corresponding to the holes of the ring member 31a is placed on the bundled ring member 31a. By melting, it is allowed to penetrate into the narrow gap by capillary action. Further, since the brazing material 32 is relatively expensive, as shown in FIG. 3, a wire or a wire 33 having a shape filling the gap is provided in the triangular gap between the ring member 31a and the ring member 31a. Alternatively, the brazing material 32 may be injected in a state in which is reduced. At this time, the wire 33 may be of such a size that it can 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 gap between the ring members 31a.

Next, a method for manufacturing the partition plate 3 configured as described above will be described with reference to FIGS.

In the case of manufacturing the partition plate 3, first, as shown in FIG. 4, a plurality of tubes 31 into which the heat transfer tubes 2 can be inserted are prepared, and the plurality of tubes 31 are bundled so as to be in close contact with each other. When the tubes 31 are bundled, as shown in FIG. 3, the second row of tubes 31 is placed in the valley of the first row of tubes 31 arranged in close contact with each other. (FIG. 4 (a)).

Next, the pipes 31 bundled in this way are accommodated in a cylindrical body 36 having an outer diameter that can be accommodated in the body 4, and a gap between each pipe 31 and the pipe 31 and a gap between the pipe 31 and the cylindrical body 36. Then, the brazing material 32 is injected, and if necessary, the wire material 33 is inserted into the gap to inject the brazing material 32. In addition, the wire 33 is abbreviate | omitted in FIG.4 and FIG.5. Then, after injecting the brazing material 32 in this way, the brazing material 32 is melted and filled with high heat to form a bundle of circular tubes 31 as a whole (FIG. 4B). When injecting the brazing material 32 into the gap between the elongated tube 31 and the tube 31, it is difficult to infiltrate the brazing material 32 deeply into the gap. It is also possible to insert the brazing material 32 into the gap between the pipe 31 and the gap between the pipe 31 and the pipe 31 to fill the gap.

After the tube 31 is bundled and brazed with the cylindrical body 36 in this manner, the mark 34 along the axial direction is put on the side surface so that the bundle of the tube 31 crosses the axial direction (preferably Are cut in a right angle direction to form the partition plate 3 (FIG. 4C).

In addition, instead of cutting after filling the gap with the brazing material 32 in this way, as shown in FIG. 5, the bundle of tubes 31 previously bundled (FIG. 5A) is perpendicular to the axial direction. Then, the bundle of the cut pipes 31 (ring members 31a) is set inside the cylindrical body 36, and the gap between the

pipes

31 and 31 and the pipes 31 and cylinders are set. The brazing material 32 may be injected into the gaps of the shaped bodies 36 and brazed (FIG. 5C). When this brazing is performed, similarly, a disk-shaped brazing material having a hole corresponding to the hole of the ring member 31a is placed on the tube 31 bundled by the cylindrical body 36, and this is melted. As a result, the gap between the pipe 31 and the pipe 31 is brazed. Thus, if the pipe | tube 31 is cut | disconnected previously before brazing, there exists a merit that the brazing material 32 can be reliably inject | poured into a clearance gap. On the other hand, if the method of cutting after brazing the whole like the former is used, the arrangement state of the tubes 31 will not be destroyed in the cutting process, and then the holes of the tubes 31 are surely aligned and the heat transfer tubes There is a merit that 2 can be inserted. For this reason, it is preferable to select and use one of the merits as appropriate for selecting any one of these manufacturing methods.

Then, the heat transfer tube 2 is passed through the partition plate 3 configured in this way (FIG. 3). When passing through the heat transfer tube 2, first, the marks 34 provided on the side surfaces of the partition plate 3 are matched to overlap the two partition plates 3, and the heat transfer tube 2 is passed inside the tube 31 in this state.

At this time, since it takes time to pass the heat transfer tube 2 through the extremely thin tube 31, the heat transfer tube 2 is inserted into the tube 31 using a jig 35 as shown in FIG. 6. May be. The jig 35 has the same outer diameter as that of the tube 31 and the inner diameter is made larger as it goes upward. The jig 35 is brought into close contact with the tube 31 and brazed. . Then, by making the outer diameter dimensions the same in this way, it is possible to insert the heat transfer tube 2 into the tube 31 by inserting the heat transfer tube 2 from the upper portion having a larger inner diameter size, and the same arrayed body as the cut tubes 31. I have to.

Then, after passing through the heat transfer tube 2 in this way, one partition plate 3 is slid to the vicinity of the other end side of the heat transfer tube 2, and the gap between each heat transfer tube 2 and the partition plate 3 is brazed. Go. Then, about the clearance gap between each heat exchanger tube 2, it will be in the state unified by the dimension of the thickness (difference of an outer diameter and an inner diameter) of the ring member 31a, and the more thin ring member 31a is used, the more the heat transfer tube 2 is used. Many heat transfer tubes 2 can be provided with a small gap.

And after attaching the partition plate 3 to the both ends of the heat exchanger tube 2 in this way, as shown in FIG. 2, it attaches so that the trunk | drum elements 41a and 41b may be pinched | interposed from the upper and lower sides or right and left, and a clearance gap is brazed, The inflow chamber 43 sealed with the partition plate 3 and the trunk 4 is formed by attaching the inflow section 43 and the discharge section 44 for allowing the fluid to flow in and out.

Next, the header cover 5 is attached to the partition plates 3 on both sides, the gap between the header 50 and the partition plate 3 is brazed, and finally, an inflow portion 51 for allowing the first fluid to flow into and out of the left and right ends, and The discharge part 52 is attached.

Thereby, when forming the multi-tube heat exchanger 1, the clearance gap of the heat exchanger tube 2 can be made small, many heat exchanger tubes 2 can be provided, and also each clearance gap can be made uniform. Become.

Thus, according to the above-described embodiment, between the plurality of heat transfer tubes 2 through which the first fluid passes, the partition plates 3 provided on both ends of the heat transfer tubes 2, and the left and right partition plates 3. A ring member into which the heat transfer tube 2 can be inserted when the multi-tube heat exchanger 1 including the enclosed chamber 40 and the header 50 provided on the end side of the heat transfer tube 2 is manufactured. A plurality of 31a are provided, and a gap between the ring member 31a and the ring member 31a is filled with a brazing material 32 to form the partition plate 3, and the heat transfer tube 2 is inserted into the formed partition plate 3 to fill the gap. Since the partition plate 3 is configured, a hole forming step is not required when creating a partition plate as in the prior art. Moreover, the clearance gap between the heat exchanger tubes 2 can be made uniform by letting the heat exchanger tubes 2 pass through the partition plates 3 arranged in close contact with the ring members 31a. Furthermore, by reducing the thickness of the inner diameter and the outer diameter of the ring member 31a, the gap between the heat transfer tube 2 and the heat transfer tube 2 can be narrowed, and many heat transfer tubes 2 can be attached.

When the partition plate 3 is formed, a plurality of pipes 31 into which the heat transfer pipes 2 can be inserted are provided, a gap between the

pipes

31 and 31 is filled with a brazing material 32, and the filled pipes 31 are connected to the shaft 31. Since the partition plate 3 is formed by cutting in a direction perpendicular to the direction, a large amount of the partition plate 3 can be formed at a time by cutting the tube 31. Moreover, since it cut | disconnects after fixing with the brazing material 32, the arrangement | positioning relationship of the pipe | tube 31 and the pipe | tube 31 will not shift, and the position of the hole of the partition plate 3 will not shift.

Further, if the bundled pipes 31 are cut in a direction perpendicular to the axial direction, and the partition plate 3 is formed by filling the space between the ring members 31a formed by the cutting with the brazing material 32, the brazing material 32 is surely formed. Can be injected into the gap.

In addition, when the heat transfer tube 2 is inserted into the partition plate 3, a mark 34 for matching the position of the tube 31 is provided, and after aligning the position of the mark 34, the two partition plates 3 are overlapped to form the heat transfer tube 2. Since one of the partition plates 3 is slid to the other end side of the heat transfer tube 2, it is easy to align the two partition plates 3 after cutting, and the heat transfer tube 2 can be easily inserted. Will be able to.

Note that the present invention is not limited to the above-described embodiment, and can be implemented in various modes.

For example, in the above-described embodiment, the second fluid is allowed to flow through the outer peripheral portion of the heat transfer tube 2 to cool the first fluid of the heat transfer tube 2, but the inner heat transfer tube is further provided inside the heat transfer tube 2. And a third fluid may be passed through the inner heat transfer tube to exchange heat with the first fluid from the inside and outside.

Moreover, in the said embodiment, when manufacturing the multi-tubular heat exchanger 1, although the trunk | drum 4 and the header cover 5 were provided and the header 50 and the chamber 40 were formed, one cylindrical member was used. It may be provided, and the partition plate 3 and the heat transfer tube 2 may be inserted therein to close both ends.

Furthermore, in the above embodiment, the inner diameter of the ring member 31a and the inner diameter of the heat transfer tube 2 are set to be substantially the same. However, a slight gap is provided so that the insertion work can be performed easily, and then the gap is brazed. It may be.

DESCRIPTION OF SYMBOLS 1 ... Multi-tube heat exchanger 2 ... Heat transfer tube 3 ... Partition plate 31 ... Pipe 31a ... Ring member 32 ... Brazing material 33 ... Wire rod 34 ... Mark 35 ... Jig 36 ... Cylindrical body 4 ... Body 40 ... Vessel 41a, 41b ... Body element 42 ... Notch 43 ... Inflow 44 ... Drain Part 5 ... Header cover 50 ... Header 51 ... Inflow part 52 ... Discharge part

Claims

A plurality of heat transfer tubes through which the first fluid passes, a partition plate provided on both ends of the heat transfer tube, a chamber enclosed between the left and right partition plates, and provided on the end side of the heat transfer tube In the manufacturing method of a multitubular heat exchanger comprising a header,
Providing a plurality of ring members into which the heat transfer tubes can be inserted, filling a gap between the ring members and the ring members to form a partition plate;
Inserting the heat transfer tube into the formed partition plate;
A method for manufacturing a multi-tube heat exchanger.
Forming the partition plate,
Providing a plurality of tubes into which the heat transfer tubes can be inserted, filling the gaps between the tubes, and
Cutting the tube filled in the hole in a direction crossing the axial direction to form a partition plate;
The method for producing a multitubular heat exchanger according to claim 1, comprising:
Forming the partition plate,
Providing a plurality of tubes into which the heat transfer tubes can be inserted, and cutting the tubes in a direction transverse to the axial direction;
Providing a plurality of ring members formed by the cutting, filling a gap between the ring member and the ring member to form a partition plate;
The method for producing a multitubular heat exchanger according to claim 1, comprising:
The partition plate is provided with a mark for matching the position of the tube, and after aligning the position of the mark, the two partition plates are stacked, and after inserting the heat transfer tube, one partition plate is connected to the other of the heat transfer tube. The method for manufacturing a multi-tube heat exchanger according to claim 2 or 3, wherein the multi-tube heat exchanger is slid to the end side.
A plurality of heat transfer tubes through which the first fluid passes, a partition plate provided on both ends of the heat transfer tube, a chamber enclosed between the left and right partition plates, and provided on the end side of the heat transfer tube A multi-tubular heat exchanger comprising a header and the partition plate,
A plurality of ring members into which the heat transfer tubes can be inserted;
A brazing material that fills the gap between the ring member and the ring member;
A multitubular heat exchanger characterized in that it is provided with