JP6058459B2 - Double tube heat exchanger - Google Patents

Description

  The present invention includes an outer tube and an inner tube, and performs heat exchange between a fluid flowing through a flow path in the inner tube and a fluid flowing through a flow path formed between the outer tube and the inner tube. The present invention relates to a heavy pipe heat exchanger.

  As is well known, heat exchangers are widely used for exchanging thermal energy between cold fluids and hot fluids. As such a heat exchanger, a single tube heat exchanger, a multi-tube heat exchanger, a double tube heat exchanger, and the like are known.

  A single tube heat exchanger has a configuration in which a heat transfer tube having a single flow path is disposed in a liquid tank. The multi-tube heat exchanger has a configuration in which a large number of heat transfer tubes are arranged in a liquid tank or a shell. In these heat exchangers, heat exchange is performed between the fluid stored in the liquid tank or the shell and the fluid flowing through the heat transfer tube.

  The double-pipe heat exchanger has a configuration in which an inner tube is disposed in an outer tube. In this configuration, heat exchange is performed between the fluid flowing through the outer flow path formed between the outer pipe and the inner pipe and the fluid flowing through the inner flow path within the inner pipe. The double-pipe heat exchanger does not need a liquid tank or the like, and can be downsized as compared with a single-pipe heat exchanger or a multi-pipe heat exchanger. Moreover, thermal efficiency can also be improved by making the distribution | circulation direction of the fluid which distribute | circulates the inside of an inner tube | pipe, and the fluid which circulates in the space between an outer tube | pipe and an inner tube into a reverse direction (counterflow).

  In a double-pipe heat exchanger, if you try to lengthen the double-pipe part to increase the heat transfer area for heat exchange and reduce the footprint (footprint) of the heat exchanger, It is necessary to bend or fold back into a U shape. Since it is not easy to perform such bending while maintaining the double tube structure, for example, a structure in which a plurality of straight tubular double tubes are connected by a single tube U-shaped curved tube is used. (For example, Patent Document 1).

  For example, Patent Document 1 discloses a double pipe in which inner pipes are connected by a curved pipe in adjacent double pipes, and a space between the outer pipe and the inner pipe is connected by a communication passage different from the curved pipe. A tubular heat exchanger is disclosed. In this configuration, the inner tube and the outer tube can be easily manufactured by simply welding. In addition, the heat transfer area can be easily adjusted by increasing or decreasing the number of double pipe portions to be connected.

  On the other hand, there has also been proposed a heat exchanger that does not require joining work such as welding or brazing and can be easily assembled with only a simple tool. For example, Patent Document 2 discloses a plurality of straight pipe heat transfer tubes arranged in parallel, a fluid supply pipe that supplies fluid by communicating with one end of each straight pipe heat transfer pipe, and communicates with the other end of each straight pipe heat transfer pipe. A multi-tube heat exchanger having a fluid collecting pipe for collecting fluid is disclosed. The fluid supply pipe and the fluid collecting pipe have a structure in which a plurality of manifolds are stacked, and a heat exchanger can be assembled by inserting each straight pipe heat transfer pipe into the manifold.

JP 2003-185364 A JP 2012-097937 A

  The configuration disclosed in Patent Document 1 can be easily manufactured as compared with the case where the U-shaped curved portion has a double tube structure. However, joining work such as welding or brazing is required at the joint portion between the double pipe portion and the curved portion or the joint portion between the double pipe portion and the communication passage. Although it is possible to adopt a structure in which a flange structure is adopted for the joint portion and the flange is joined and fixed with bolts and nuts, the number of tightening points is increased. Further, in such a structure, the adjacent double pipe portions cannot be arranged close to each other for the convenience of arranging the curved portion and the communication passage. Therefore, there was a limit to miniaturization.

  On the other hand, the configuration disclosed in Patent Document 2 has few fastening points by bolts and nuts, and can easily assemble a heat exchanger. Moreover, decomposition | disassembly is also easy and increase / decrease in a heat exchanger tube can also be performed easily. However, the technique disclosed in Patent Document 2 is intended for a multi-tube heat exchanger, and in order to perform heat exchange, it is necessary to put the assembled heat exchanger into a liquid tank or the like. Therefore, it is difficult to reduce the size.

  The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a double-pipe heat exchanger that can be easily assembled and can be reduced in size as compared with the prior art. And

  In order to achieve the above object, the present invention employs the following technical means. First, the present invention has a plurality of outer tubes and inner tubes arranged in each outer tube, and a flow path formed between the outer tube and the inner tube arranged in the outer tube in the outer tube. Is assumed to be a double-pipe heat exchanger that exchanges heat between a fluid flowing through the inner pipe and a fluid flowing through the inner pipe. The double-pipe heat exchanger according to the present invention includes an end member and a fixing member. The end member has a first space, a second space, and a partition, and is connected to an end portion of the outer tube and an end portion of the inner tube in each outer tube. The first space communicates with the space in the inner pipe. The second space communicates with the space between the outer tube and the inner tube. The partition separates the first space and the second space. The fixing member fixes a plurality of end members connected to each of the adjacent outer tubes in a state where the end members are connected in a direction intersecting the fluid flow direction in the outer tube and the inner tube. For example, when the outer tube and the inner tube are arranged horizontally, the fixing member fixes the end member in a state of being connected in the vertical direction. In the above configuration, the first space of the end member includes an open end that is open in a direction intersecting with the fluid flow direction in the outer tube and the inner tube. Further, the second space of the end member also includes an open end that is opened in a direction intersecting with the fluid flow direction in the outer tube and the inner tube. And when the some edge part member connected with each of the adjacent outer tube | pipe is connected, in the adjacent edge part member, corresponding open ends mutually communicate.

  This double tube heat exchanger has a relatively simple configuration in which end members are connected to both ends of a double tube having an outer tube and an inner tube, and the end members are fixed by a fixing member. Moreover, since the flow path which connects the adjacent outer tubes and the inner tubes arranged in these outer tubes is configured by connecting the end members, the adjacent outer tubes are arranged close to each other. be able to. Therefore, a small double tube heat exchanger can be realized.

  In the above-described double pipe heat exchanger, the partition wall of the end member includes a branch pipe part connected to the inner pipe, and a main pipe part having open ends at both ends in a direction intersecting the fluid flow direction in the branch pipe part. And a T-shaped tube communicating with each other.

  Further, the above-described end member may include a T-shaped outer tube and a T-shaped inner tube. The outer pipe has a configuration in which a branch pipe portion connected to the outer pipe and a main pipe portion having open ends at both ends in a direction intersecting with a fluid flow direction in the branch pipe portion are communicated. The inner tube is configured by a T-shaped tube that is arranged in the outer tube and has a branch pipe portion that is connected to the inner tube. The open end of the inner tube corresponding to one open end of the main tube portion of the outer tube is disposed so as to protrude outward from the open end of the outer tube, and corresponds to the other open end of the main tube portion of the outer tube. The open end of the inner tube can be disposed inside the open end of the outer tube. In this configuration, when a plurality of end members connected to each of the adjacent outer pipes are connected, the other open end of the main pipe portion of the outer pipe enters the adjacent end member and is adjacent to the adjacent end pipe. A configuration communicating with the one open end in the main pipe portion of the outer pipe of the end member can be employed. With these configurations, the connection between the end members can be reliably and easily realized.

  In the above double tube heat exchanger, when connecting a plurality of end members connected to each of the adjacent outer tubes, the open end on one side of the main tube portion can be closed. Thereby, the flow path comprised by the some outer tube | pipe and inner tube | pipe can be made into the serial connection which consists of a meander structure, for example.

  Further, in the above-described double pipe heat exchanger, the double pipe part to which the end members are connected at both ends includes a plurality of outer pipes, an inner pipe and a connecting member respectively disposed in the plurality of outer pipes. It is also possible to adopt a configuration provided. The connection member supports one outer tube and an inner tube disposed in the one outer tube at one end, and supports the other outer tube and the inner tube disposed in the other outer tube at the other end. The connecting member communicates the space in the inner tube supported at both ends and communicates the space between the outer tube and the inner tube supported at both ends. Thereby, the said space | interval can be maintained at a predetermined space | interval, without arrange | positioning the member for maintaining the space | interval of an inner tube and an outer tube | pipe inside a double pipe part.

  According to the present invention, it is possible to realize a double-pipe heat exchanger that can be easily assembled and disassembled and can be reduced in size as compared with the conventional one.

The schematic block diagram which shows the whole structure of the double tube | pipe type heat exchanger in one Embodiment of this invention. Schematic which shows an example of the edge part member with which the double pipe | tube type heat exchanger in one Embodiment of this invention is provided. Sectional drawing which shows an example of the edge part member with which the double-tube type heat exchanger in one Embodiment of this invention is equipped Schematic which shows an example of the drawer | drawing-out member with which the double tube | pipe type heat exchanger in one Embodiment of this invention is equipped. Schematic which shows the structural example of the flow path of the double pipe | tube type heat exchanger in one Embodiment of this invention. Schematic which shows an example of the obstruction | occlusion member with which the double tube | pipe type heat exchanger in one Embodiment of this invention is provided. Schematic which shows an example of the connection member of the double pipe | tube type heat exchanger in one Embodiment of this invention. Schematic which shows the usage example of the connection member of the double pipe type heat exchanger in one Embodiment of this invention. Schematic which shows the other example of the edge part member with which the double pipe | tube type heat exchanger in one Embodiment of this invention is provided. Sectional drawing which shows the other example of the edge part member with which the double tube | pipe type heat exchanger in one Embodiment of this invention is equipped. Schematic which shows the further another example of the edge part member with which the double pipe type heat exchanger in one Embodiment of this invention is provided.

  Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. Hereinafter, the present invention is embodied based on a configuration in which a plurality of straight tubular double tubes arranged in the horizontal direction are connected in the vertical direction.

  FIG. 1 is a schematic configuration diagram showing an overall configuration of a double-pipe heat exchanger 10 in the present embodiment. As shown in FIG. 1, the double tube heat exchanger 10 includes a straight tubular double tube portion 11 and end members 12 respectively connected to both ends of the double tube portion 11. In addition, the double-pipe heat exchanger 10 has a plurality of end members 12 connected to one end of the double-pipe part 11 in a direction (here, vertical) that intersects the fluid flow direction in the double-pipe part 11. A fixing member 13 that is fixed in a state of being connected in the direction).

  Each double pipe portion 11 includes an outer pipe 1 and an inner pipe 2 disposed in the outer pipe 1. In FIG. 1, the inner pipe 2 in the double pipe portion 11 is indicated by a broken line for explanation. In this configuration, a space (outer tube 1) formed between a fluid flowing through a flow channel in the inner tube 2 (hereinafter referred to as an inner flow channel) and the outer tube 1 and the inner tube 2 in the outer tube 1. The heat exchange between the fluid flowing through the flow path (hereinafter referred to as the outer flow path) formed by the inner wall surface of the inner tube 2 and the outer wall surface of the inner tube 2 can be realized. Although not particularly limited, in this embodiment, both the outer tube 1 and the inner tube 2 are circular tubes and are arranged coaxially. The outer tube 1 and the inner tube 2 may be made of any material such as a metal tube made of copper, copper alloy, stainless steel, aluminum or the like, or a resin tube made of vinyl chloride, a high density polyethylene tube or the like. For example, the inner tube 2 can be composed of a metal tube having excellent heat conductivity, and the outer tube 1 can be composed of a resin tube capable of heat insulation from the outside. Thus, by using a resin tube for the outer tube 1, it is possible to reduce the weight and cost of the double tube heat exchanger 10.

  The end member 12 includes two spaces and a partition that separates the two spaces. 2A to 2D are schematic external views showing the structure of the end member 12. FIGS. 3A to 3C are schematic cross-sectional views showing the structure of the end member 12. FIG. 2A corresponds to a plan view of the end member 12. FIG. 2B corresponds to a left side view of the end member 12. FIG. 2C corresponds to a front view of the end member 12. FIG. 2D corresponds to a right side view of the end member 12. The bottom view is the same as the plan view, and the rear view is the same as the front view. 3A is a longitudinal sectional view taken along line AA shown in FIG. 2A, and FIG. 3B is a transverse section taken along line BB shown in FIG. 2C. FIG. FIG. 3C is an enlarged view of the arrow finger portion X shown in FIG. In FIG. 2A and FIG. 2D, the groove is indicated by a thick line.

  As shown in FIG. 2A to FIG. 2D, FIG. 3A, and FIG. 3B, the end member 12 has a rectangular parallelepiped casing 20, and separates the two spaces. A partition wall 21 is provided inside. The partition wall 21 is configured by a T-shaped tube that communicates a branch pipe portion 23 and a main pipe portion 22 having open ends at both ends in a direction intersecting the fluid flow direction in the branch pipe portion 23.

  As shown in FIGS. 2A and 3A, the surface 20a of the housing 20 where the open end of the main pipe portion 22 is exposed is open. Although not particularly limited, in this example, the open end of the main pipe portion 22 is disposed at a position flush with the surface 20 a of the housing 20. 2D and 3B, the surface 20b of the housing 20 where the open end of the branch pipe portion 23 is exposed is larger than the outer diameter of the inner pipe 2 and the outer pipe 1 A circular opening 24 smaller than the inner diameter is provided. In this example, the branch pipe part 23 and the opening part 24 are arranged coaxially, and the open end of the branch pipe part 23 is arranged at a position flush with the surface 20 b of the housing 20 through the opening part 24. Yes. As shown in FIG. 2B, FIG. 2C, FIG. 3A, and FIG. 3B, the other surface of the housing 20 has openings that communicate with the two spaces described above. do not do.

  Further, as shown in FIG. 2A, a portion of the main pipe portion 22 opposite to the connection portion of the branch pipe portion 23 is fixed to the housing 20 over the entire length of the main pipe portion 22. Although not particularly limited, in the present embodiment, the housing 20 and the partition wall 21 are made of plastic resin or the like, and are integrally molded or a plurality of parts (for example, two parts divided by the AA line shown in FIG. 2A). It is formed by heat fusing components.

  As shown in FIGS. 2A and 3B, the fixed portion between the main pipe portion 22 and the housing 20 constitutes a thick portion 27, and the thick portion 27 includes a fluid in the main pipe portion 22. A through hole 25 is formed along the flow direction. Similarly, the surface 20b of the housing 20 from which the open end of the branch pipe part 23 is exposed also constitutes a thick part 28, and the thick part 28 also has a through hole 25 along the fluid flow direction in the main pipe part 22. Is formed. The through holes 25 are used for connecting and fixing the end members 12 by the through bolts 13a and the nuts 13b, which are the fixing members 13 described above.

  In the end member 12 having the above-described structure, the open end of the branch pipe part 23 is connected to the inner pipe 2 of the double pipe part 11. In the present embodiment, the open end of the branch pipe portion 23 is configured such that the outer diameter is larger than the outer diameter of the inner tube 2 and the inner diameter is smaller than the inner diameter of the inner tube 2. An insertion groove 29b into which the inner tube 2 is inserted is formed (see FIGS. 3A and 3B). Therefore, when the inner tube 2 is inserted into the insertion groove 29 b, the space (first space) inside the T-shaped tube communicates with the inner flow path of the double tube portion 11. Although not particularly limited, in the present embodiment, as shown in FIG. 3C, a plurality of insertion grooves 29 b are provided on the side peripheral surface on the inner wall side of the branch pipe part 23 along the axial direction of the branch pipe part 23 ( Here, three groove portions 291 are provided. A sealing material 292 such as an O-ring is disposed in each groove 291. The outer diameter of the sealing material 292 is slightly larger than the inner diameter of the inner tube 2, and the liquid tightness (or airtightness: the same applies hereinafter) is secured by fitting the inner tube 2 into the fitting groove 29b. The branch pipe part 23 and the inner pipe 2 can be connected in a state.

  In addition, an insertion groove 29 a into which the outer tube 1 is inserted is formed around the opening 24 on the above-described surface 20 b that is the outer surface of the thick portion 28. When the outer tube 1 is inserted into the fitting groove 29a in a state where the open end of the branch tube portion 23 and the inner tube 2 of the double tube portion 11 are connected, the outer surface of the T-shaped tube and the inner surface of the housing 20 The space (second space) partitioned by and communicates with the outer flow path of the double pipe portion 11. Although not particularly limited, in the present embodiment, the fitting groove 29a is formed on the side peripheral surface on the branch pipe portion 23 side along the axial direction of the branch pipe portion 23 in the same manner as the fitting groove 29b shown in FIG. A plurality of (here, three) groove portions are provided, and a sealing material such as an O-ring is disposed in each groove portion. The outer diameter of the sealing material is slightly larger than the inner diameter of the outer tube 1, and the outer tube 1 is fitted into the fitting groove 29 a, so that the outer side of the double-pipe portion 11 is secured in a state where liquid tightness is secured. The flow path can be connected to a space (second space) between the outer surface of the T-shaped tube and the inner surface of the housing 20.

  On the other hand, as can be understood from FIG. 1, in the end member 12, the above-described surface 20 a (the upper surface and the bottom surface in FIG. 2C) where the open end of the main pipe portion 22 is exposed is joined to the adjacent end member 12. It becomes a surface. In this embodiment, as shown in FIGS. 2 (a) and 3 (a), a groove 26a for arranging a sealing material such as an O-ring is provided along the outer periphery of the housing 20 exposed on the joint surface. It has been. Similarly, a groove part 26b for arranging a sealing material such as an O-ring is provided along the outer periphery of the partition wall 21 (that is, the open end of the main pipe part 22) exposed at the joint surface. The adjacent end members 12 interpose a sealant along the outer periphery of the housing 20 between the groove portions 26a facing each other at the both end member 12 and the partition wall 21 between the groove portions 26b facing each other at the both end member 12 Are connected together with a sealant interposed therebetween.

  The plurality of end members 12 thus connected are fixed in a state where they are connected by a fixing member 13 composed of a through bolt 13a and a nut 13b. As shown in FIG. 1, a fluid is introduced into the space (first space) of the end member 12 communicating with the inner tube 2 of the double tube portion 11 at one end side of the plurality of end members 12 to be connected. Is connected to the inner flow path drawing member 14 for discharging fluid from the space. In addition, a space (second space) of the end member 12 communicating with the space between the outer tube 1 and the inner tube 2 of the double tube portion 11 is provided on the other end side of the plurality of end members 12 to be connected. ) Is connected to an outer flow path drawing member 15 for supplying fluid or discharging fluid from the space. The fixing member 13 fixes the plurality of end members 12 in a connected state by sandwiching the end member 12 including the inner channel drawing member 14 and the outer channel drawing member 15.

  FIG. 4A to FIG. 4D are cross-sectional views showing the structures of the inner channel drawing member 14 and the outer channel drawing member 15. FIGS. 4A and 4B correspond to the inner channel drawing member 14, and FIGS. 4C and 4D correspond to the outer channel drawing member 15. In any of the inner channel drawing member 14 and the outer channel drawing member 15, the structure of the surface connected to the end member 12 is the same as the surface 20a of the end member 12 described above. 4 (a) and FIG. 4 (c) are plan views of the surface opposite to the surface connected to the surface. 4B corresponds to a longitudinal sectional view taken along line CC shown in FIG. 4A, and FIG. 4D is a longitudinal sectional view taken along line DD shown in FIG. 4C. Corresponding to

  As shown in FIG. 4A and FIG. 4B, the inner channel drawing member 14 communicates with the main pipe portion 22 of the end member 12 and is on the opposite side to the surface connected to the end member 12. A connecting pipe 42 having a circular cross section provided in a state of projecting outward on the surface 41, and a closing part 43 that closes a portion of the surface 41 excluding the connecting pipe 42 are provided. In the inner flow path drawing member 14, a through hole 45 is formed at a position corresponding to the through hole 25 of the end member 12, and the through hole 45 of each end member 12 by a through bolt that is the fixing member 13. Used for connecting and fixing.

  Similarly, as shown in FIGS. 4C and 4D, the outer flow path drawing member 15 is partitioned by the outer surface of the main pipe portion 22 of the end member 12 and the inner surface of the housing 20. The connecting pipe 47 having a circular cross section provided in a state of communicating with the space and projecting outward on the surface 46 opposite to the surface connected to the end member 12, and the connecting pipe 47 on the surface 46 are excluded. And a closing portion 48 that closes the portion. In the outer channel drawing member 15, a through hole 49 is formed at a position corresponding to the through hole 25 of the end member 12, and the through hole 49 of each end member 12 by a through bolt that is the fixing member 13. Used for connecting and fixing.

  The method for assembling the double-pipe heat exchanger 10 having the above structure is not particularly limited. For example, first, end members 12 corresponding to the number of the double pipe portions 11 to be arranged, the inner channel drawing member 14, and the outer channel drawing member 15 are provided with grooves 26a and 26b provided on the respective joint surfaces. Are arranged in the state shown in FIG. And the penetration bolt 13a and the nut 13b which are the fixing members 13 are used, the penetration bolt 13a is inserted from one end side through the through holes 25, 44 and 49, and the other end side is fastened with the nut 13b. Fix it.

  A pair of connecting members of the end member 12 as described above is configured, and the inner pipe 2 is respectively inserted into the fitting groove 29b of the open end of the branch pipe portion 23 of each end member 12 of one connecting member as described above. Installing. Further, the outer tube 1 is mounted in the fitting groove 29a of each end member 12 connected to the inner tube 2 as described above. Thereafter, the inner tube 2 is mounted in the fitting groove 29b at the open end of the branch pipe portion 23 of each end member 12 of the other connected body, and the outer tube 1 is mounted in the fitting groove 29a of each end member 12 respectively. To do.

  For example, a low-temperature fluid supply pipe is connected to one of the connection pipes 42 (for example, the connection pipe 42a) of the inner flow path drawing member 14 of the double-tube heat exchanger 10 assembled as described above, and the other (for example, The fluid discharge pipe is connected to the connection pipe 42b). Further, for example, a high-temperature fluid supply pipe is connected to one of the connection pipes 47 (for example, the connection pipe 47b) of the outer flow path drawing member 15, and the fluid discharge pipe is connected to the other (for example, the connection pipe 47a). . In addition, the connection method of the supply pipe or the discharge pipe to the connection pipes 42 and 47 is arbitrary. An arbitrary joint may be used for connection, and flanges may be provided on both the connection ends of the connection pipes 42 and 47 and the connection pipes of the discharge pipe and the discharge pipe, and the connection may be made via the flanges.

  In the above-described configuration, the fixing member 13 is used only for the connection of the end member 12. However, if necessary, a biasing force is applied in a direction in which the connection body of the pair of end member 12 is attracted to each other. A force member may be added. As the urging member, any member can be adopted. For example, both ends of the urging member in which a tension adjusting member such as a turnbuckle is interposed in a tension transmitting member such as a rope, a wire, and a tie rod, It is possible to adopt a configuration in which each of the coupling bodies (for example, the inner channel drawing member 14 and the outer channel drawing member 15) is mounted. In this case, it is preferable that an attachment portion for the tension transmitting member is formed in advance on the inner channel drawing member 14, the outer channel drawing member 15 or the end member 12.

  The double pipe heat exchanger 10 described above has a structure in which the double pipe portions 11 are connected in parallel. That is, in the double-pipe heat exchanger 10, as shown in FIG. 5A, the fluid supplied from the supply pipe 51 to the connection pipe 42a is one inner flow as shown by a solid line arrow in the figure. After flowing into the path drawing member 14 a, it flows into the inner pipe 2 of each double pipe portion 11 through each end member 12. And it discharges | emits to the discharge pipe 52 via each other edge part member 12, the other inner side channel | drawer drawing member 14b, and the other connection pipe 42b. Further, the other fluid supplied from the other supply pipe 53 to the connection pipe 47b is indicated by a broken line arrow in the drawing (in the double pipe portion 11, an arrow is attached above the outer pipe 1). Then, after flowing into one outer flow path drawing member 15b, it flows into the outer flow path between the outer pipe 1 and the inner pipe 2 of each double pipe section 11 via each end member 12. And it discharges | emits to the discharge pipe 54 via each other edge part member 12, the other outer side channel drawing | extracting member 15a, and the other connection pipe 47a.

  On the other hand, according to the double-pipe heat exchanger of the present embodiment, a structure in which the double-pipe portions 11 are connected in series as shown in FIG. it can. In this case, each end member 12 is connected in a state in which the closing member 60 is interposed between the specific end members 12. That is, the closing member 60 is disposed between each pair of the end members 12, with the two end members 12 as one set in each connected body constituting the connected body of the pair of end members 12. And the closure member 60 is arrange | positioned in a mutually different position in one connection body and the other connection body. For example, when the closing member 60 is arranged on the lower surface of the odd-numbered end member 12 (the first, third, fifth in FIG. 5B) from the upper side in one connected body, The closing member 60 is disposed on the lower surface of the even-numbered end members 12 (0, 2, 4, and 6th in FIG. 5B). As shown in FIG. 6, the closing member 60 has the same outer shape as the housing 20 in a plan view, and a through hole through which the fixing member 13 (through bolt 13 a) passes at a position corresponding to the through hole 25. It is comprised by the board | plate material which has 65.

  Further, in this double tube heat exchanger 50, a longer double tube configuration can be realized by performing drawing of the inner channel and drawing of the outer channel from the same end member 12. Therefore, in this example, the inner / outer channel drawing member 16 is connected to the end member 12 that pulls out the inner channel and the outer channel. The inner / outer channel drawing member 16 has a cross section that communicates with the space defined by the outer side surface of the main pipe portion 22 of the end member 12 and the inner side surface of the housing 20 in the closing portion 43 of the inner channel drawing member 14 described above. A circular outer flow path connecting pipe 57 is provided so as to protrude outward. In the example shown in FIG. 5B, since there are six double pipe portions 11, the inner and outer flow path drawing members 16 are connected to both ends of the connecting body (here, left) of one end member 12. Yes.

  In the double-pipe heat exchanger 50, as shown in FIG. 5B, the fluid supplied from the supply pipe 51 to the connection pipe 42a is drawn out from one of the inner and outer flow paths as shown by a solid arrow in the figure. After flowing into the member 16a, it flows into the inner pipe 2 of the double pipe portion 11 via the end member 12. And the connection of the other inner / outer flow path drawing member 16b is sequentially performed through the set of the end member 12 connected to the other end of the inner tube 2 and the inner tube 2 connected to the set of the end member 12. It is discharged to the discharge pipe 52 through the pipe 42b. Further, the other fluid supplied from another supply pipe 53 is indicated by a broken-line arrow in the drawing (in the double pipe portion 11, an arrow is attached above the outer pipe 1). After flowing into the other inner / outer channel drawing member 16b from the connecting pipe 57b, it flows into the outer channel of the double pipe portion 11 via the end member 12. Then, the other inner / outer flow passage is drawn through the pair of end members 12 connected to the other end of the double pipe part 11 and the double pipe part 11 connected to the set of the end member 12 in order. It is discharged to the discharge pipe 54 through the outer flow path connecting pipe 57b of the member 16a.

  In the configuration shown in FIGS. 5A and 5B, a plurality of double-pipe heat exchangers 10 can be connected to the supply pipes 51 and 53. Similarly, a plurality of double-pipe heat exchangers 10 can be connected to the discharge pipes 52 and 54.

  As described above, the double-tube heat exchanger 10 connects the end member 12 to both ends of the double tube portion 11 having the outer tube 1 and the inner tube 2, and the end member 12 is fixed by the fixing member 13. Since it is a simple configuration of fixing, it can be easily assembled and disassembled easily. Moreover, since the flow path which connects the adjacent outer tubes 1 and the inner tubes 2 arranged in these outer tubes 1 is configured by connecting the end members 12 to each other, the bending portion and the communication passage are formed. The adjacent outer tubes 1 can be arranged close to each other. Therefore, a small double tube heat exchanger can be realized. In addition, depending on the presence or absence of the closing member 60, it is possible to arbitrarily select and assemble a parallel type in which each double pipe portion 11 is connected in parallel and a series type in which each double pipe portion 11 is connected in series. it can.

  By the way, in the above-mentioned structure, when the length of the double pipe part 11 becomes remarkably long, the outer tube 1 and the inner tube 2 may be bent by their own weight. When such bending occurs, the outer flow path on the lower side of the inner tube 2 is narrowed, which may reduce the thermal efficiency. From this viewpoint, it is preferable that the double pipe portion 11 uses the outer pipe 1 and the inner pipe 2 having a relatively short length (for example, 1 to 1.5 m). However, in such a configuration, the distance between the connection bodies of the pair of end members 12 is limited to the lengths of the outer tube 1 and the inner tube 2. Further, as a countermeasure against bending, a support member for maintaining a distance between the outer tube 1 and the inner tube 2 may be disposed between the outer tube 1 and the inner tube 2 in the intermediate portion of the double tube portion 11. Although it is conceivable, it is difficult to dispose such a support member in the double pipe portion 11 in which the distance between the inner pipe 2 and the outer pipe 1 is extremely narrow for improving thermal efficiency.

  Therefore, in the present embodiment, a connecting member that connects the double pipe portions 11 to each other is used. Fig.7 (a)-FIG.7 (d) are figures which show an example of the connection member 17 in this embodiment. 7A corresponds to a plan view of the connecting member 17, and FIG. 7B corresponds to a right side view of the connecting member 17. The bottom view is the same as the plan view, and the left side view is the same as the right side view. The front view and the rear view are configured with a flat surface having no irregularities. Moreover, FIG.7 (c) is a longitudinal cross-sectional view in alignment with line EE shown to Fig.7 (a), FIG.7 (d) is a cross section in alignment with line FF shown in FIG.7 (c). FIG. In FIG. 7B, the grooves are indicated by thick lines.

  As shown in FIGS. 7A to 7D, the connecting member 17 includes a rectangular parallelepiped casing 70 having the same dimensions as the casing 20 of the end member 12. The casing 70 is provided with an outer flow path 71 and an inner flow path 72 in a state orthogonal to two opposing surfaces. As shown in FIG. 7B, the inner flow path 72 is a space partitioned by a cylindrical partition wall 73. The partition wall 73 is coaxially fixed and supported in a columnar space provided in the housing 70, and the space between the inner wall surface of the columnar space and the outer wall surface of the partition wall 73 constitutes the outer flow path 71. Yes. In the present embodiment, plate-like support portions 74 provided from one end to the other end of the outer flow path 71 on two opposing outer wall surfaces of the partition wall 73 fix the partition wall 73 to the housing 70. Although not particularly limited, in the present embodiment, the housing 70, the partition wall 73, and the support portion 74 are made of plastic resin or the like, and are integrally molded or divided by a plurality of parts (for example, the EE line shown in FIG. 7A). Two parts) are heat-sealed.

  As shown in FIGS. 7B to 7D, in the connection member 17, the open end of the partition wall 73 has an outer diameter larger than the outer diameter of the inner tube 2 and an inner diameter smaller than the inner diameter of the inner tube 2. An insertion groove 79b into which the inner tube 2 is inserted is formed at the open end. Therefore, when the inner pipe 2 is inserted into the fitting groove 79 b, the inner flow path 72 communicates with the inner flow path of the double pipe portion 11. Although not particularly limited, in the present embodiment, a plurality of insertion grooves 79b are formed along the axial direction of the partition wall 73 on the side peripheral surface on the inner wall side of the partition wall 73 in the same manner as the insertion groove 29b shown in FIG. Here, three groove portions are provided, and a sealing material such as an O-ring is disposed in each groove portion. The outer diameter of the sealing material is slightly larger than the inner diameter of the inner tube 2, and the inner tube 2 is fitted into the fitting groove 79 b so that the liquid tightness is secured and the inner side of the double tube portion 11 is secured. The flow path and the inner flow path 72 of the connection member 17 can be connected.

  Moreover, the insertion groove | channel 79a in which the outer tube | pipe 1 is inserted is formed in the circumference | surroundings of the both ends of the above-mentioned cylindrical space. When the outer tube 1 is inserted into the fitting groove 79 a in a state where the inner tube 2 and the connection member 17 are connected, the outer flow path 71 of the connection member 17 communicates with the outer flow path of the double pipe portion 11. Although not particularly limited, in this embodiment, like the insertion groove 29b shown in FIG. 3 (c), the insertion groove 79a has a plurality of (here,) along the axial direction of the partition wall 73 on the side peripheral surface on the partition wall 73 side. 3 places), and a sealing material such as an O-ring is disposed in each groove. The outer diameter of the sealing material is slightly larger than the inner diameter of the outer tube 1, and by fitting the outer tube 1 into the fitting groove 79a, the outer side of the double tube portion 11 is secured in a liquid-tight state. The flow path and the outer flow path 71 of the connection member 17 can be connected. In the present embodiment, the outer tube 1 and the inner tube 2 are supported coaxially at one end of the connection member 17.

  In this example, through holes 75 are formed at the four corners of the housing 70 in plan view. As will be described later, the through-hole 75 is used for connecting and fixing a plurality of connecting members 17 by a fixing member 73 configured by through-bolts and nuts.

  FIG. 8 is a schematic view showing a double tube heat exchanger 80 using the connecting member 17. As shown in FIG. 8, the double-pipe heat exchanger 80 includes an end member 12 corresponding to the number of double pipe portions 11 to be arranged, an inner flow path pulling member 14, and an outer flow path pulling member 15. The double pipe portion 11 connected by the connecting member 17 is mounted between a pair of connecting bodies that are connected to each other by interposing a sealing material in the groove portions 26a and 26b provided on each joint surface.

  As described above, in the present embodiment, since the outer shape of the connection member 17 is the same as the outer shape of the end member 12, each connection member 17 is disposed opposite to each end member, so that the double tube Each part can be connected without giving unnecessary load to the part 11. Further, in the present embodiment, the lengths of the outer tube 1 and the inner tube 2 constituting each double tube portion 11 are the same, and each connection member 17 is mutually connected between the coupling bodies of the pair of end members 12. Located adjacent to each other. In the present embodiment, a plurality of connecting members 17 adjacent to each other are connected and fixed by a fixing member 73 made of a through bolt and a nut inserted into the through hole 75 described above.

  As described above, by using the connection member 17, it is possible to prevent the outer tube 1 and the inner tube 2 from being bent due to their own weight and the outer flow path becoming narrow. Therefore, it becomes possible to make the space | interval of the connection body of a pair of edge part member 12 a desired space | interval, without reducing thermal efficiency. Further, it is not necessary to arrange a support member for maintaining the distance between the outer tube 1 and the inner tube 2 between the outer tube 1 and the inner tube 2 constituting the double tube portion 11.

  In the example of FIG. 8, the fixing members 13 and 73 are used for the connection of the end member 12 and the connection member 17, but the connection body of the end member 12 and the connection member 17 may be used as necessary. You may add the above-mentioned urging member which provides urging | biasing force in the direction which mutually attracts a connection body.

  Subsequently, another example of the end member will be described. This end member 18 is different from the above-described end member 12 in that the joint surfaces of the end members that are connected to each other have irregularities that fit together. FIGS. 9A to 9D are schematic external views showing the structure of the other end member 18. FIGS. 10A and 10B are schematic cross-sectional views showing the structure of the end member 18. FIG. 9A corresponds to a plan view of the end member 18. FIG. 9B corresponds to a left side view of the end member 18. FIG. 9C corresponds to a front view of the end member 18. FIG. 9D corresponds to a right side view of the end member 18. The bottom view is the same as the plan view, and the rear view is symmetric with the front view. 10A is a longitudinal sectional view taken along line GG shown in FIG. 9A, and FIG. 10B is a transverse section taken along line HH shown in FIG. 9C. FIG. In FIG. 9A and FIG. 9D, the grooves are indicated by thick lines.

  As shown in FIGS. 9A to 9D, FIG. 10A, and FIG. 10B, the end member 18 has a T-shaped outer side in a casing 90 having a rectangular parallelepiped outer shape. A tube 92 and a T-shaped inner tube 93 disposed in the outer tube 92 are provided. In this example, the housing 90 forms an outer tube 92. As shown in FIGS. 10 (a) and 10 (b), the outer pipe 92 intersects the branch pipe part 92b connected to the outer pipe 1 of the double pipe part 11, and the fluid flow direction in the branch pipe part 92b. The main pipe portion 92a having open ends at both ends in the direction to be communicated. Similarly, the inner pipe 93 includes a branch pipe part 93b connected to the inner pipe 2 of the double pipe part 11, and a main pipe part 93a having open ends at both ends in a direction crossing the fluid flow direction in the branch pipe part 93b. It has the structure which connected. Although not particularly limited, the flow path cross sections of the outer tube 92 and the inner tube 93 are circular.

  Further, as shown in FIGS. 9A, 10A, and 10B, a portion of the main pipe portion 93a of the inner pipe 93 opposite to the connection portion of the branch pipe portion 93b is the outer pipe 92. The main pipe portion 92a is fixed to an inner wall surface facing the branch pipe portion 92b over a predetermined length in the axial direction of the main pipe portion 92a. Although not particularly limited, in the present embodiment, the end member 18 is made of plastic resin or the like, and is integrally molded or a plurality of parts (for example, two parts divided by the GG line shown in FIG. 9A). Is formed by heat sealing. In FIGS. 10A and 10B, the casing 90 and the inner tube 93 constituting the outer tube 92 are illustrated as separate members for the sake of explanation, but are configured as one member. It is preferred that

  As shown in FIGS. 9 (b) to 9 (d), 10 (a), and 10 (b), on the side of one surface 90a where the open end of the main tube portion 92a of the outer tube 92 is exposed, the main tube portion The open end of 92a protrudes from the surface 90a. Further, on the other surface 90c side where the open end of the main tube portion 92a of the outer tube 92 is exposed, the open end of the main tube portion 92a is recessed from the surface 90c. The protruding amount of the main pipe portion 92a on the surface 90a side is equal to the recessed amount of the main pipe portion 92a on the surface 90c side, and the protruding portion of the main pipe portion 92a on the surface 90a side is the concave portion of the main pipe portion 92a on the surface 90c side. Fits into the entrance.

  Further, in this end member 18, the open end of the main pipe portion 93a of the inner pipe 93 corresponding to one open end (the surface 90c side in FIG. 10A) of the main pipe portion 92a of the outer pipe 92 is the outer pipe. It is arranged to protrude outward from the open end of 92. Furthermore, the open end of the inner tube 93 corresponding to the other open end (the surface 90a side in FIG. 10A) of the main tube portion 92a of the outer tube 92 is disposed inside the open end of the outer tube 92. Yes. The protruding amount of the main pipe portion 93a with respect to the open end of the main pipe portion 92a on the surface 90c side is equal to the recessed amount of the main pipe portion 93a with respect to the open end of the main pipe portion 92a on the surface 90a side. The protruding portion of the main pipe portion 93a on the surface 90c side is fitted into the recessed portion of the main pipe portion 93a on the surface 90a side.

  With the above configuration, when the surfaces 90 a and 90 c of the two end members 18 are joined, the open end of the main tube portion 92 a of the outer tube 92 of one end member 18 is the outer tube of the other end member 18. The outer tube 92 enters the recessed portion 92 and is connected to the open end of the main tube portion 92a of the outer tube 92 of the other end member 18 so that the outer tubes 92 communicate with each other. In addition, the open end of the main pipe portion 93a of the inner tube 93 of the other end member 18 enters the recessed portion of the inner tube 93 of the one end member 18, and the inner tube 93 of the one end member 18 is It connects with the open end of the main pipe part 93a, and inner pipes 93 communicate with each other.

  Further, as shown in FIGS. 9D and 10B, in the end member 18, the open end of the branch pipe portion 92b of the outer pipe 92 and the open end of the branch pipe section 93b of the inner pipe 93 are housings. 90 of the same surface 90b is exposed. The open end of the branch pipe portion 93b of the inner pipe 93 is configured such that the outer diameter is larger than the outer diameter of the inner pipe 2 and the inner diameter is smaller than the inner diameter of the inner pipe 2, and the inner pipe 2 is fitted into the open end. A fitting groove 99b is formed. Therefore, when the inner tube 2 is inserted into the fitting groove 99b, the flow channel in the inner tube 93 communicates with the inner flow channel of the double tube portion 11. Although not particularly limited, in the present embodiment, like the fitting groove 29b shown in FIG. 3 (c), the fitting groove 99b is formed on the side peripheral surface on the inner wall side of the inner pipe 93 along the axial direction of the branch pipe portion 93b. A plurality of (here, three) groove portions are provided, and a sealing material such as an O-ring is disposed in each groove portion. The outer diameter of the sealing material is slightly larger than the inner diameter of the inner tube 2, and the inner tube 2 is fitted into the fitting groove 99 b so that the liquid tightness is secured and the inner side of the double tube portion 11 is secured. The flow path and the flow path in the inner pipe 93 can be connected.

  An insertion groove 99a into which the outer tube 1 is inserted is formed around the open end of the branch tube portion 92b of the outer tube 92 on the surface 90b. When the outer tube 1 is inserted into the fitting groove 99a in a state where the inner tube 2 and the end member 18 are connected, the outer side constituted by the outer wall surface of the inner tube 93 of the end member 18 and the inner wall surface of the outer tube 92. The flow path communicates with the outer flow path of the double pipe portion 11. Although not particularly limited, in the present embodiment, as in the insertion groove 29b shown in FIG. 3C, a plurality of insertion grooves 99a are formed on the side peripheral surface on the inner tube side along the axial direction of the branch pipe portion 92b (see FIG. Here, three groove portions are provided, and a sealing material such as an O-ring is disposed in each groove portion. The outer diameter of the sealing material is slightly larger than the inner diameter of the outer tube 1, and the outer tube 1 is fitted into the fitting groove 99 a, so that the outer side of the double-pipe portion 11 is secured in a state where liquid tightness is ensured. The flow path and the outer flow path of the end member 18 can be connected.

  In this example, as shown in FIGS. 9A and 10A, through holes 95 are formed at the four corners of the housing 90 in plan view. The two through holes 95 located in the vicinity of the outer tube 92 are formed closer to the outer tube 92 from the viewpoint of ensuring liquid tightness. The through hole 95 is used for connecting and fixing the plurality of end members 18 by the fixing member 13 constituted by through bolts and nuts.

  On the other hand, as described above, in the end member 18, the surface where the open ends of the main pipe portions 92 a and 93 a are exposed serves as a joint surface with the adjacent end member 18. In this embodiment, as shown in FIGS. 9A and 10A, an outer tube 92 (opening of the main tube portion 92a) that exposes a groove portion 96a for arranging a sealing material such as an O-ring to the joint surface. End). Similarly, a groove portion 96b for arranging a sealing material such as an O-ring is provided along the outer periphery of the inner tube 93 (open end of the main tube portion 93a) exposed to the joint surface. The adjacent end members 18 have a sealing material interposed along the outer periphery of the outer tube 92 between the groove portions 96a facing each other at the both end member members 18, and the inner tube between the groove portions 96b facing each other at the both end member members 12. 93 are connected with a sealing material interposed therebetween.

  The plurality of end members 18 connected in this manner are fixed in a state where they are connected by the fixing member 13 including the through bolt 13a and the nut 13b, similarly to the end member 12. In the end member 18 as described above, each flow path is communicated by fitting a joint surface having irregularities, so that the connection between the end members 18 can be reliably and easily realized. Such a concavo-convex structure may be adopted for the partition wall 21 of the end member 12.

  The end member 18 has a configuration in which one open end of the main pipe portion 92a of the outer tube 92 enters the adjacent end member 18 when the plurality of end members 18 are connected. A configuration in which the main pipe portion 92a of 92 does not enter the adjacent end member 18 and only the main pipe portion 93a of the inner pipe 93 enters the adjacent end member 18 may be employed. Also, in the end member 18, when the plurality of end members 18 are connected, a closing member that closes the open end on one side of the main pipe portions 92a and 93a is arranged, so that each double pipe portion 11 is arranged. It is also possible to constitute a double pipe heat exchanger connected in series in a meander shape.

  In the above description, the joining structure between the end member 12 and the inner tube 2, the joining structure between the end member 12 and the outer tube 1, the joining structure between the connecting member 17 and the inner tube 2, the connecting member 17 and the outer tube 1. The joining structure between the end member 18 and the inner tube 2 and the joining structure between the end member 18 and the outer tube 1 are not particularly limited. It is possible to adopt any structure that can be connected in a state in which it is secured. Hereinafter, modifications will be described using the end member 12 as an example.

  FIG. 11A to FIG. 11C are cross-sectional views showing an end member 19 having another structure in which the end member 12 and the inner tube 2 are joined in the end member 12 described above. In the drawings, the same reference numerals as the constituent parts of the end member 12 are attached to the parts having the same effects as the end member 12. FIG. 11A corresponds to FIG. 3A, and FIG. 11B corresponds to FIG. Moreover, FIG.11 (c) is a figure which expands and shows the arrow finger | toe part Y shown in FIG.11 (b).

  In the end member 19, the outer diameter of the open end of the branch pipe part 23 is slightly smaller than the inner diameter of the inner pipe 2. In addition, a plurality of (here, three) groove portions 293 are provided on the outer periphery of the branch tube portion 23 along the axial direction of the branch tube portion 23, and a sealing material 294 such as an O-ring is disposed in each groove portion 293. The The outer diameter of the sealing material 294 is slightly larger than the inner diameter of the inner pipe 2. By fitting the inner pipe 2 outside the branch pipe portion 23, the branch pipe portion 23 is secured in a state where liquid tightness is ensured. And the inner pipe 2 can be connected.

  When the above structure is adopted, the outer tube 1 and the inner tube 2 constituting the double tube portion 11 inevitably have the inner tube 2 longer than the outer tube 1. In other words, the inner tube 2 needs to be longer than the outer tube 1 by twice the distance from the end of the inner tube 2 to the bottom of the fitting groove 29a when the inner tube 2 is attached to the end member 19. There is. In this configuration, when the double pipe heat exchanger is assembled, when the double pipe portion 11 is connected to the end member 19, the inner pipe 2 is more than the outer pipe 1 at the other end of the double pipe portion 11. Protruding state. Therefore, the operation | work which mounts the said other end to the edge part member 17 becomes very easy. In this way, the double pipe portion 11 in which the inner tube 2 is longer than the outer tube 1 is formed by, for example, the depth of the fitting groove 29b in the end member 12 shown in FIGS. 3 (a) and 3 (b). This can be realized by making the depth deeper than the insertion groove 29a.

  The above-described embodiments do not limit the technical scope of the present invention, and various modifications and applications other than those already described are possible within the scope of the present invention. For example, in the above embodiment, the double pipe portion 11 is a straight tube, but the use of a curved double pipe portion is not excluded. The present invention can be applied without any problem as long as the flow path is a curve that changes by several degrees.

  Moreover, in the said embodiment, although the external shape of the edge part member or the connection member was made into the rectangular parallelepiped shape, arbitrary shapes can be employ | adopted if an adjacent edge part member and an adjacent connection member can be connected.

  According to the present invention, as compared with the prior art, it can be easily assembled and disassembled, can be miniaturized, and is useful as a double tube heat exchanger.

DESCRIPTION OF SYMBOLS 1 Outer pipe 2 Inner pipe 10, 50, 80 Double pipe type heat exchanger 11 Double pipe part 12, 18, 19 End member 13, 73 Fixing member 17 Connection member 20, 70, 90 Case 21 Bulkhead 22 Main pipe Part 23 Branch pipe part 60 Closure member 92 Outer pipe 93 Inner pipe 92a, 93a Main pipe part 92b, 93b Branch pipe part

Claims (6)

A fluid having a plurality of outer tubes and inner tubes disposed in each outer tube, and flowing in a flow path formed between the outer tube and the inner tube in the outer tube, and flowing in the inner tube A double-tube heat exchanger for exchanging heat with a fluid
The first space communicating with the space in the inner tube, the second space communicating with the space between the outer tube and the inner tube, and the first space and the second space are separated. And an end member connected to the end of the outer tube and the end of the inner tube in each outer tube,
A fixing member that fixes the plurality of end members connected to each of the adjacent outer pipes in a state of being connected in a direction intersecting with a fluid flow direction in the outer pipe and the inner pipe,
With
The first space of the end member includes an open end that is open in a direction intersecting with a fluid flow direction in the outer tube and the inner tube, and the second space of the end member is the outer tube. And the end members adjacent to each other when the plurality of end members connected to the adjacent outer tubes are connected to each other. in the open end between the corresponding is communicated with each other, and
The end member is
A T-shaped outer pipe that communicates with a branch pipe section connected to the outer pipe, and a main pipe section having open ends at both ends in a direction intersecting the fluid flow direction in the branch pipe section;
A T-shaped inner pipe that is disposed in the outer pipe and communicates with a branch pipe section that connects to the inner pipe and a main pipe section that has open ends at both ends in a direction that intersects the fluid flow direction in the branch pipe section. When,
With
The open end of the inner tube corresponding to one open end of the main tube portion of the outer tube is disposed to protrude outward from the open end of the outer tube, and corresponds to the other open end of the main tube portion of the outer tube. the open end of the inner tube, the double pipe heat exchanger that will be placed in recessed inside the open end of the outer tube. When the plurality of end members connected to each of the adjacent outer pipes are connected, the other open end of the main pipe portion of the outer pipe enters the adjacent end member and the adjacent end The double-tube heat exchanger according to claim 1 , wherein the double-tube heat exchanger is in communication with the one open end of the main pipe portion of the outer pipe of the member. When connecting a plurality of said end member connected to each of the outer tube, wherein the adjacent open end of one side of the main pipe portion of the main pipe portion and said inner tube of said outer tube is closed, according to claim 1 Or the double-pipe heat exchanger of Claim 2 . A double pipe part to which the end member is connected to both ends,
Multiple outer tubes,
An inner pipe disposed in each of the plurality of outer pipes;
The one end supports the one outer tube and the inner tube disposed in the one outer tube, and the other end supports the other outer tube and the inner tube disposed in the other outer tube. A connecting member that communicates the space in the inner tube to be supported and communicates the space between the outer tube and the inner tube that are supported at both ends;
The double-tube heat exchanger according to any one of claims 1 to 3 , further comprising: A fluid having a plurality of outer tubes and inner tubes disposed in each outer tube, and flowing in a flow path formed between the outer tube and the inner tube in the outer tube, and flowing in the inner tube A double-tube heat exchanger for exchanging heat with a fluid
The first space communicating with the space in the inner tube, the second space communicating with the space between the outer tube and the inner tube, and the first space and the second space are separated. And an end member connected to the end of the outer tube and the end of the inner tube in each outer tube,
A fixing member that fixes the plurality of end members connected to each of the adjacent outer pipes in a state of being connected in a direction intersecting with a fluid flow direction in the outer pipe and the inner pipe,
With
The first space of the end member includes an open end that is open in a direction intersecting with a fluid flow direction in the outer tube and the inner tube, and the second space of the end member is the outer tube. And the end members adjacent to each other when the plurality of end members connected to the adjacent outer tubes are connected to each other. The corresponding open ends communicate with each other, and the double pipe portion to which the end members are connected at both ends,
Multiple outer tubes,
An inner pipe disposed in each of the plurality of outer pipes;
The one end supports the one outer tube and the inner tube disposed in the one outer tube, and the other end supports the other outer tube and the inner tube disposed in the other outer tube. A connecting member that communicates the space in the inner tube to be supported and communicates the space between the outer tube and the inner tube that are supported at both ends;
Double-pipe heat exchanger Ru comprising a. A fluid having a plurality of outer tubes and inner tubes disposed in each outer tube, and flowing in a flow path formed between the outer tube and the inner tube in the outer tube, and flowing in the inner tube A double-tube heat exchanger for exchanging heat with a fluid
The first space communicating with the space in the inner tube, the second space communicating with the space between the outer tube and the inner tube, and the first space and the second space are separated. And an end member connected to the end of the outer tube and the end of the inner tube in each outer tube,
A fixing member that fixes the plurality of end members connected to each of the adjacent outer pipes in a state of being connected in a direction intersecting with a fluid flow direction in the outer pipe and the inner pipe,
With
The first space of the end member includes an open end that is open in a direction intersecting with a fluid flow direction in the outer tube and the inner tube, and the second space of the end member is the outer tube. And the end members adjacent to each other when the plurality of end members connected to the adjacent outer tubes are connected to each other. The corresponding open ends communicate with each other,
The partition wall of the end member has a T-shaped configuration in which a branch pipe part connected to the inner pipe and a main pipe part having open ends at both ends in a direction intersecting a fluid flow direction in the branch pipe part are communicated. Composed of tubes,
One open end of the main pipe portion is disposed so as to protrude outward in the axial direction of the main pipe portion at a joint surface with an adjacent end member, and the other open end of the main pipe portion is adjacent to the adjacent end member. A double-pipe heat exchanger that is recessed in the axially inner side of the main pipe at the joining surface.

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