JP2024000307A - Manufacturing method of heat exchanger - Google Patents

Abstract

To provide a manufacturing method of a heat exchanger that can suppress formation of a gap at a portion where an inner wall surface of an outer pipe and a current plate should contact with each other.SOLUTION: A plurality of inner pipes 2 are inserted through a pair of end plates 3, and an assemble 10 arranged to support the plurality of inner pipes 2 between the pair of end plates 3 is prepared. A plurality of divided materials 4a divided in a longitudinal direction of an outer pipe 4 are arranged around the prepared assembly 10. The plurality of divided materials 4a are fastened up with fixing bands 7, at respective positions of the pair of end plates 3 and of a plurality of current plates 5 so that the divided materials 4a contact the pair of end plates 3 of the assembly 10 and the plurality of current plates 5. The outer pipe 4 is prepared and the pair of end plates 3 and the plurality of current plates 5 are fixed to the divided materials 4a through welding materials 9, by welding the divided materials 4a to each other so that gaps 8 between the divided materials 4a formed along the longitudinal direction are filled.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method for manufacturing a heat exchanger.

Conventionally, as this type of heat exchanger, a heat exchanger has been proposed that includes a plurality of inner tubes through which a first medium flows, and an outer tube that covers the entire plurality of inner tubes and through which a second medium flows. (For example, see Patent Document 1). This heat exchanger is further provided with a pair of end plates that seal the outer tube at both ends of the outer tube with the plurality of inner tubes inserted therethrough. According to this heat exchanger, heat exchange can be performed between the first medium flowing through the plurality of inner tubes and the second medium flowing through the outer tube.

Special Publication No. 2002-500749

By the way, in a heat exchanger as shown in Patent Document 1, the second medium contacts the inner wall surface of the outer tube and is arranged at intervals along the longitudinal direction of the outer tube so as to form a flow path through which the second medium flows. It is assumed that a plurality of rectifying plates are arranged. However, when manufacturing a heat exchanger, if a gap is formed in the area where the inner wall surface of the outer tube and the rectifying plate should come into contact, the second medium may slip through this gap and flow. There is a risk of uneven heat generation in the container.

The present invention has been made in view of such problems, and is directed to the manufacture of a heat exchanger that can suppress the formation of a gap in the portion where the inner wall surface of the outer tube and the rectifier plate should come into contact. The purpose is to provide a method.

In view of the above problems, the method for manufacturing a heat exchanger according to the present invention includes: a plurality of inner tubes through which a first medium flows; an outer tube that covers the entirety of the plurality of inner tubes and through which a second medium flows; a pair of end plates that seal the outer tube at both ends of the outer tube when the inner tube is inserted therethrough, and a pair of end plates that support the plurality of inner tubes and form a flow path through which the second medium flows. A method for manufacturing a heat exchanger, comprising: a plurality of rectifying plates that contact an inner wall surface of the outer tube and are arranged at intervals along the longitudinal direction of the outer tube, the method comprising: a preparation step of inserting an inner tube through the pair of end plates and preparing an assembly in which the plurality of baffle plates are arranged so as to support the plurality of inner tubes between the pair of end plates; an arrangement step of arranging a plurality of dividing members obtained by dividing the outer tube in the longitudinal direction around the assembly; and a step of arranging the dividing members on the pair of end plates and the plurality of current plates of the assembly; a tightening step of tightening the plurality of divided members with a fixing band at respective positions of the pair of end plates and the plurality of rectifying plates so as to be in contact with each other; and a tightening step of tightening the plurality of divided members formed along the longitudinal direction. The outer tube is produced by welding the divided members to each other so as to fill the gaps therebetween, and the pair of end plates and the plurality of rectifying plates are fixed to the divided members via the welding material. The method is characterized in that it includes at least a fixing step.

According to the present invention, in the tightening process, when the plurality of divided members forming the outer tube are tightened with the fixed band, the divided members are deformed by the tightening force of the fixed band, and the plurality of divided members are deformed by the tightening force of the fixed band. The dividing member can be brought into contact with the current plate. In this tightened state, in the fixing process, the divided materials are welded to each other so as to fill the gaps between the divided materials, thereby producing an outer tube.A pair of end plates and a plurality of Fix the current plate. Thereby, the current plate can be fixed to the outer tube with no gap between the inner wall surface of the outer tube and the current plate. As a result, heat unevenness in the heat exchanger can be reduced.

(a) is a schematic perspective view of a heat exchanger assembly according to an embodiment of the present invention, (b) is a schematic perspective view of an outer tube, and (c) is a schematic perspective view of a heat exchanger assembly. It is a typical perspective view for explaining the arrangement process in a manufacturing method. (a) is a schematic perspective view for explaining the tightening process, (b) is a sectional view taken along line AA in (a), and (c) is a schematic perspective view for explaining the tightening process. FIG. 3B is a cross-sectional view taken along line BB in FIG. FIG. 3 is a cross-sectional view of a heat exchanger for comparison.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the manufacturing method of the heat exchanger based on embodiment of this invention is described in detail based on drawing. First, the structure of the heat exchanger will be briefly explained.

1. About the heat exchanger 1 As shown in FIGS. 2(a) and 2(b), the heat exchanger 1 according to the present embodiment is a heat exchanger made of metal such as aluminum or stainless steel, and the first medium flows through the heat exchanger 1. It includes a plurality of inner tubes 2 and an outer tube 4 that entirely covers the plurality of inner tubes 2 and through which a second medium such as oil flows.

The inner tube 2 and the outer tube 4 are cylindrical, and in the heat exchanger 1, heat exchange is performed between the first medium and the second medium flowing through them. An inflow port 41 through which the second medium flows is formed in one side wall along the longitudinal direction of the outer tube 4, and an outflow port 42 through which the second medium flows out is formed in the other side wall. has been done.

The heat exchanger 1 further includes a pair of end plates 3 and a plurality of current plates 5. The pair of end plates 3 seal the internal space of the outer tube 4 at both ends of the outer tube 4 with the plurality of inner tubes 2 inserted therethrough. Each end plate 3 has a disc shape and is attached to the outer tube 4 by welding while in contact with the inner wall surface 43 of the outer tube 4.

The current plate 5 contacts the inner wall surface 43 of the outer tube 4 in the longitudinal direction of the outer tube 4 so as to form a flow path 11 (see FIG. 2) through which the second medium flows between the pair of end plates 3. are arranged at intervals along the The current plate 5 has the shape of a disc-shaped plate with an arch-shaped portion cut off. The plurality of current plates 5 are fixed to the outer tube 4 so that the cut-off portions are arranged alternately along the longitudinal direction of the outer tube 4. Thereby, the flow path 11 becomes a serpentine-shaped flow path. Further, the current plate 5 supports a plurality of inner tubes 2, and the inner tubes 2 are inserted through the current plate 5. Note that a sealing material may be provided between the end plate 3 and the current plate 5 and the inner tube 2 so that the second medium does not flow.

By the way, in the comparative heat exchanger 90 shown in FIG. The inner wall surface 43 of the outer tube 4 is welded to the periphery of the inner wall surface 43 of the outer tube 4 using a welding material 9. However, if a gap is formed in the area where the inner wall surface 43 of the outer tube 4 and the rectifying plate 5 should be in contact, the second medium may slip through this gap and flow, causing the heat exchanger 90 to generate heat. Unevenness may occur. From this point of view, in this embodiment, the heat exchanger 1 is manufactured as follows.

2. Regarding the manufacturing method of the heat exchanger 1 As shown in FIG. 1(a), an assembly 10 and a plurality of divided members 4a are prepared (preparation step). As described above, the prepared assembly 10 includes a plurality of inner tubes 2 inserted through a pair of end plates 3, and a plurality of baffle plates 5 arranged between the pair of end plates 3 to support the plurality of inner tubes 2. This is an assembly in which In this embodiment, the outer diameter of the end plate 3 is larger than the outer diameter of the rectifier plate 5, but if no gap is formed between them and the outer tube 4, these outer diameters may be the same. The outer diameter of the end plate 3 may be smaller than the outer diameter of the current plate 5.

As shown in FIG. 1(b), the plurality of dividing members 4a are obtained by dividing the outer tube 4 in the longitudinal direction of the outer tube 4. In this embodiment, the outer tube 4 is divided in half (i.e., It is a divided material (divided into two parts). An inflow port 41 and an outflow port 42 are formed in one of the divided members 4a.

Next, as shown in FIG. 1(c), a plurality of (two) dividing members 4a are placed around the assembly 10 (placement step). Here, since the apparent outer circumference length of the rectifying plate 5 (the circumferential length when it is shaped like a disk) is longer than the inner circumference length of the two divided members 4a, the two divided members 4a are arranged. In this state, a gap 8 is formed between them (see FIG. 2(a)).

Next, as shown in FIGS. 2(a) and 2(b), the pair of end plates 3 and the plurality of rectifying plates 5 of the assembly 10 are arranged so that the dividing member 4a contacts them. At each position of the plurality of rectifier plates 5, the plurality of divided members 4a are tightened with the fixing band 7 (tightening process).

Next, with the fixing band 7 tightened, as shown in FIG. The outer tube 4 is produced by welding the divided members 4a together. The pair of end plates 3 and the plurality of rectifying plates 5 are fixed to the dividing member 4a via the welding material 9 formed by this welding (fixing step).

In this way, in the tightening process, when the two split members 4a that form the outer tube 4 are tightened with the fixing band 7, the split members 4a are deformed by the tightening force of the fixing band 7, and the pair of end plates 3 The dividing member 4a can be brought into contact with the plurality of rectifying plates 5. In this tightened state, the outer tube 4 is produced by welding the split members 4a to each other so as to fill the gaps between the split members 4a, and a pair of end plates 3 are attached to the split members 4a via the welding material 9. The current plate 5 is fixed. Thereby, the current plate 5 can be fixed to the outer tube 4 without any gap between the inner wall surface 43 of the outer tube 4 and the current plate 5.

1: Heat exchanger, 2: Inner tube, 3: End plate, 4: Outer tube, 4a: Split material, 5: Straightening plate, 7: Fixed band, 8: Gap, 9: Welding material

Claims (1)

a plurality of inner tubes through which the first medium flows;
an outer tube that entirely covers the plurality of inner tubes and through which a second medium flows;
a pair of end plates that seal the outer tube at both ends of the outer tube when the plurality of inner tubes are inserted therethrough;
Abutting against the inner wall surface of the outer tube and arranged at intervals along the longitudinal direction of the outer tube so as to support the plurality of inner tubes and form a flow path through which the second medium flows. A method for manufacturing a heat exchanger comprising a plurality of rectifier plates,
Preparing an assembly in which the plurality of baffle plates are arranged so as to insert the plurality of inner tubes into the pair of end plates and support the plurality of inner tubes between the pair of end plates. process and
arranging a plurality of divided members obtained by dividing the outer tube in the longitudinal direction around the assembly;
At each position of the pair of end plates and the plurality of rectifying plates, a fixing band is attached to the plurality of rectifying plates so that the dividing member contacts the pair of end plates and the plurality of rectifying plates of the assembly. A tightening process of tightening the divided materials,
The outer tube is produced by welding the divided members to each other so as to fill the gaps between the divided members formed along the longitudinal direction, and the pair of ends are attached to the divided members via the welding material. a fixing step of fixing the plate and the plurality of rectifying plates;
A method for manufacturing a heat exchanger, comprising at least the following:

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