JP2006078017A - Tube type heat exchanger and water heater with this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive and high-performance tube type heat exchanger, capable of extending length of a pipe for heat exchange within a limited dimension, improving reliability against water leak at a branch part for diverging fluid, of which compressive resistant strength is secured and a water heater provided with the tube type heat exchanger. <P>SOLUTION: The tube type heat exchanger consists of a flexible outer tube 1, a metal inner tube 10 inserted in the outer tube 1 along its axial direction with a gap 2 formed in between an inner wall of the outer tube 1, a branch member B, attached to both end parts of a pipe member A consisting of the outer tube 1 and the metal inner tube 10, for introducing or discharging respectively different fluid to the outer tube 1 and the metal inner tube 10. In this case, a leakage detection tube 13 with a gap part 12 can be provided on an outer wall of the metal inner tube 10. The outer tube 1 can be structured by flexible silicone, fluoro system or resin. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tube heat exchanger capable of exchanging heat between fluids and a water heater provided with the same.

  In a conventional heat exchanger, after forming a plastic outer tube through which a fluid such as water passes, a non-flexible metal tube through which a fluid such as a refrigerant passes is inserted into the plastic outer tube. And the branch part which branches fluids, such as water and fluids, such as a refrigerant | coolant, was integrally formed with the plastic outer tube | pipe (for example, refer patent document 1).

JP 2004-60906 A (page 3, FIG. 4)

  In conventional heat exchangers, in order to improve heat exchange performance, it is difficult to make the length of plastic outer pipes that allow fluids such as water to pass longer in a limited size under high temperature conditions. Furthermore, it has been very difficult to insert a metal tube through which a fluid such as a refrigerant passes into a plastic outer tube having no flexibility. Moreover, it is not easy to ensure the reliability and pressure resistance against water leakage at a branching portion that branches a fluid such as water and a fluid such as a refrigerant.

The present invention has been made to solve the above-described problems, and in order to improve heat exchange performance, the pipe length for heat exchange can be made longer in a limited size, and it is inexpensive and expensive. It aims at obtaining the tube type heat exchanger of performance, and a water heater provided with the same.
In addition, to obtain a low-cost and high-performance tube heat exchanger that has improved reliability against water leakage at a branching portion that branches a fluid such as water and a fluid such as a refrigerant, and has a pressure resistance strength, and a water heater provided with the same. With the goal.

  The tube-type heat exchanger according to the present invention includes a metal inner tube having a gap between a flexible outer tube and an inner wall of the outer tube that is inserted along the axial direction of the outer tube. A pipe and a branch member attached to both ends of the pipe member composed of the outer tube and the metal inner tube to introduce or discharge separate fluids to and from the outer tube and the metal inner tube, respectively. .

  The tube-type heat exchanger according to the present invention has a longer pipe length for heat exchange in a limited space, and fluid such as water flows on the outer wall of the metal inner tube through which fluid such as refrigerant flows. Since it is made to flow directly in contact, the maximum heat conduction effect can be obtained with high efficiency. Further, since it is only necessary to insert a metal inner pipe through which a fluid such as a refrigerant passes into an outer pipe tube through which a fluid such as water passes, brazing becomes unnecessary, and the weight and cost are reduced.

Embodiment 1 FIG.
1 is an overall view of a tube heat exchanger according to Embodiment 1 of the present invention, FIG. 2 is an XX sectional view of a piping section shown in FIG. 1, and FIG. 3 is a sectional view of a branching member shown in FIG. is there. As shown in FIGS. 1 and 2, the tube heat exchanger includes a piping member A and branching members B attached to both ends thereof. The piping member A includes a metal inner tube 10 such as a copper tube inserted in a flexible outer tube 1 using silicon, fluorine, resin, or the like other than metal. An outer flow path 2 through which a second fluid such as water passes is formed between the inner side of 1 and the outer side of the metal inner pipe 10, and an inner flow path 11 through which the first fluid such as a refrigerant passes inside the metal inner pipe 10. Is formed.

A metal leakage detection tube 13 is provided on the outer peripheral wall of the metal inner tube 10.
The leakage detection gap 12 having a substantially U-shaped cross section is opened at the inner wall side at a constant interval along the circumferential direction of the inner wall and in the axial direction of the leakage detection tube 13. It is provided so as to be substantially parallel. In this way, the metal inner pipe 10 and the leak detection pipe 13 form a double-structured metal inner pipe 14 with leak detection, and the first fluid flowing in the inner flow path 11 and the second fluid flowing in the outer flow path 2 are mixed. To prevent it.

  The branch members B located at both ends of the tube heat exchanger are introduced into the pipe member A or piped in a state where the first fluid flowing in the inner flow path 11 and the second fluid flowing in the outer flow path 2 are separated from each other. As shown in FIG. 3, the tubular branch body 20 that locks the outer tube 1 and the leaky metal inner tube 14 and the outer tube 1 are fixed to the branch body 20. An outer tube fixing nut 21 to be fixed, a metal inner tube packing 22 for fixing the leakage detection inner metal tube 14 to the branch body 20, and a packing fixing nut for fixing the leakage detection metal inner tube 14 via the metal inner tube packing 22. 23 and a branch pipe 24 having an L-shaped cross section that is attached to the branch body 20 and communicates with the outer tube 1.

  The structure of the branch member B will be described in detail. The branch body 20 includes a cylindrical passage 20a having an inner diameter slightly reduced in diameter than the inner diameter of the outer tube 1, and a branch pipe that is open to the side wall and communicates with the passage 20a. And an outer tube locking portion 20c having a step for locking the inner wall end portion of the outer tube 1, and an end portion side of the branch hole 20b (via the branch hole 20b). An inner projection that is located on the opposite side of the outer tube tube 1 and has an inner diameter slightly larger than the outer diameter of the metal inner tube 14 with leakage detection and projects toward the center of the inner flow path 11. It is comprised by the installation part 20d.

An outer tube fixing nut 21 is attached to the outer tube locking portion 20c of the branch body 20 to tighten and fix the outer tube 1 to be inserted and locked into the outer tube locking portion 20c from the outer wall side. An inner pipe packing 22 is provided on the end side of the section 22d to fix the metal inner pipe 14 with leak detection inserted along the passage 20a of the branch body 20, and further, the end of the branch body 20 is provided with a center. A gasket fixing nut 23 provided with a through hole 23 a that penetrates the metal inner tube 14 with leakage detection is attached to the metal inner tube 14 with leakage detection via the inner tube packing 22.
The tube heat exchanger configured as described above is used by being connected to a water heater or the like.

  The operation of the first embodiment configured as described above will be described. Among the branching members B of the tube heat exchanger, the branch pipe 24 of the branching member B located on the first end side (upper side in FIG. 1) of the piping member A goes to the outer flow path 2 of the piping member A. The water that is the second fluid that has flowed in further from the branch pipe 24 of the branch member B located on the second end side (the lower side in FIG. 1) of the pipe member A through the outer flow path 2 of the pipe member A. It is discharged in the direction B.

On the other hand, the first fluid that flows from the branching member B located on the second end side (lower side in FIG. 1) of the piping member A of the tube heat exchanger into the inner flow path 11 of the piping member A from the direction C. A certain refrigerant passes through the inner flow path 11 of the piping member A and is discharged in two directions from the branch pipe 24 of the branching member B located at the first end (upper side in FIG. 1) of the piping member A. Thus, the branch member B shown in FIG. 3 allows the water and the refrigerant to flow in the opposite directions in the state where water and the refrigerant are separated from each other, and the water flowing through the outer flow path 2 and the refrigerant flowing through the inner flow path 11 Becomes counter flow.
In addition, when the metal inner pipe 10 is damaged and leakage occurs, the leaked water or refrigerant enters the gap portion 12 of the leak detection pipe 13, and water and refrigerant are not mixed.

  According to the first embodiment, since the second fluid flowing through the outer flow path 2 is in direct contact with all the peripheral walls of the metal inner tube with leakage detection 14, the maximum heat conduction with the first fluid. Can be obtained. Further, if a material having a heat insulating property is used as the material of the outer tube 1, the heat conduction loss can be suppressed even when the metal inner tube 14 with leakage detection contacts the inner wall of the outer tube 1. Furthermore, since the heat conduction loss can be suppressed even if the outer tube 1 is in contact with each other, a degree of freedom is generated in the piping path and the shape of the heat exchanger, and it becomes possible to make it compact and dense.

  Further, since only the metal inner tube 14 with leakage detection is inserted into the outer tube 1, manufacturing processes such as brazing, brazing, and caulking are not required. Furthermore, the outer tube 1 and the metal inner tube 14 with leakage detection can be freely handled, such as being wound into a track or spiral within a bending radius where no buckling occurs. It is. Moreover, since the metal inner tube 14 with leak detection has a structure with leak detection, the first fluid and the second fluid can be prevented from being mixed by the space that forms the gap portion 12. Furthermore, since the branch member B is used, the first fluid and the second fluid can be easily and reliably separated without manufacturing steps such as brazing, brazing, and caulking.

Embodiment 2. FIG.
FIG. 4 is a cross-sectional view of a tube heat exchanger according to Embodiment 2 of the present invention. In the first embodiment, only one metal inner tube 10 is inserted into the outer tube 1, but in the second embodiment, a plurality of metal inner tubes 10 are inserted into the outer tube 2. It is.
The inner diameter of the outer tube 1 and the outer diameter of the metal inner tube 10 are set so that the optimum cross-sectional area is obtained from the required flow rates of the first fluid and the second fluid when the amount of heat exchange and dimensional restrictions are required. Set the number and so on.
Other configurations and operations are substantially the same as those shown in the first embodiment, and a description thereof will be omitted.

  According to the second embodiment, since a plurality of, for example, three metal inner tubes 10 are inserted into the outer tube 1 to increase the heat transfer area, a larger heat exchange can be obtained. Further, even when the outer tube 1 is bent, it is possible to suppress tube deformation and secure a flow path for the second fluid.

Embodiment 3 FIG.
FIG. 5 is a longitudinal cross-sectional view of a connection portion of the piping member A of the tube heat exchanger according to Embodiment 3 of the present invention. In the first embodiment, the outer tube 1 is made of the same material. However, in the third embodiment, different materials are combined in each path of the outer tube 1. As shown in FIG. 5, the connecting portion of the piping member A connects the first outer tube 1 a that requires heat resistance specifications and the second outer tube 1 b that does not require heat resistance specifications by connecting members C. Yes. That is, the material specification of the first outer tube 1a is optimally selected based on the temperature specification of the second fluid, and the temperature specification is the same as that of the second outer tube 1b, which does not require the heat resistance specification in the pipe portion having a low temperature. Use a different material.

The connecting member C has a substantially cylindrical shape, and a locking portion 31 having a step for locking the inner wall end portions of the outer tube 1a, 1b is provided at both ends of the outer periphery of the connecting body 30. A male screw 32 is provided on the inner periphery of the stopper 31, and the outer wall ends of the outer tube tubes 1 a and 1 b that are inserted into and locked into the stopper 31 are fastened and fixed to the male screw 32 from the outside. Outer tube fixing nuts 32 and 33 are screwed together.
Other configurations and operations are substantially the same as those in the case of the first embodiment, and thus description thereof is omitted.

  According to the third embodiment, if the material specification of the outer tube 1a, 1b2 for the second fluid is optimally selected based on the temperature specification of the second fluid, the cost can be reduced without using an unnecessarily expensive material. Can be kept inexpensive.

1 is an overall view of a tube heat exchanger according to Embodiment 1 of the present invention. It is XX sectional drawing of the piping member of FIG. It is a longitudinal cross-sectional view of the branch member of FIG. It is sectional drawing of the piping member of the tube type heat exchanger which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional view of the connection part of the piping member of the tube type heat exchanger which concerns on Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer tube, 10 Metal inner tube, 12 Gap part, 13 Leak detection tube, 14 Metal inner tube with leak detection, 20 Branch body, 20b Branch hole, 21 Outer tube fixing nut, 22 Inner tube packing, 23 Packing fixing nut 24 branch pipe, A piping member, B branch member, C connecting member.

Claims (6)

A flexible outer tube, a metal inner tube inserted in the outer tube along the axial direction thereof to form a gap with the inner wall of the outer tube, and the outer tube and the metal inner tube A tube-type heat exchanger comprising a branch member attached to both ends of a piping member constituted by the pipe member and introducing or discharging separate fluids to and from the outer tube tube and the metal inner tube. The tube-type heat exchanger according to claim 1, wherein a metal inner tube with a leak detection provided with a gap is provided on an outer wall of the metal inner tube. 3. The tube heat exchanger according to claim 1, wherein the outer tube is made of flexible silicon, fluorine, or resin. A cylindrical branch body having a branch hole in the side wall; a branch pipe attached to the branch hole and communicating with the outer tube; and an end of the outer tube provided at one end in the axial direction of the branch body An outer tube fixing nut that locks the outer peripheral portion of the inner metal tube that is provided at the other end of the branch body and is inserted into the outer tube tube through the packing, and the inner metal tube The tube-type heat exchanger according to any one of claims 1 to 3, further comprising a branching member including a packing fixing nut to be penetrated. The tube heat exchanger according to any one of claims 1 to 4, wherein the outer tube constituting the piping member is made of a different material in each path. A hot water heater comprising the tube heat exchanger according to claim 1.

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