JP2012047407A - Heat exchanger, heat exchange system, method of constructing heat exchange system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger of high efficiency and the like capable of being easily manufactured, and easily constructed in installation, without fear of causing misalignment of pitches of pipes of the heat exchanger.SOLUTION: A double pipe 3 is provided with an inner pipe 3a inside thereof, and an outer pipe 3b is integrally formed at its outside. An inner peripheral face of a trough section 13 of the outer pipe 3b is fused to an outer peripheral face of the inner pipe 3a. A space surrounded by an outer peripheral face of the inner pipe 3a and an inner peripheral face of a peak section 11 is applied as a flow channel in which a fluid flows. Both ends of the double pipe 3 are respectively provided with fluid pipe connecting sections 5a, 5b. The fluid flowing into the flow channel spirally flows in the flow channel between the inner pipe 3a and the outer pipe 3b of the double pipe 3, to the other end side. The fluid reaching the end section flows inside of the inner pipe 3a, and flows in the end direction at a fluid pipe connecting section 5a side. When the fluid reaches an axial end section of the double pipe 3, the fluid inside of the flow channel flows out to a fluid pipe 7b through a joint 9b.

Description

  The present invention relates to a heat exchanger or the like that can perform heat exchange with high efficiency with underground heat or heat generation of a transmission line, is simple in construction, and is low in cost.

  While environmental problems such as global warming are attracting attention, the use of geothermal heat and the like is being promoted as clean and safe thermal energy. For example, geothermal heat is constant at about 15 to 16 ° C. throughout the year, and is therefore used as a heat source for summer cooling and winter heating.

  As a heat exchange system using geothermal heat, (1) a horizontal loop type in which a pipe is bent horizontally and buried in the ground, and heat is exchanged between the fluid circulating in the pipe and the geothermal heat, and (2) the structure When constructing an object, there is a method in which a pipe whose tip is bent into a U-shape is buried at the same time as construction of a foundation pile, and heat exchange between the fluid circulating in the pipe and the geothermal heat is performed.

  In addition, (3) a heat exchanger (Patent Document 1) that embeds a coil in the ground spirally and exchanges heat with geothermal heat, and (4) a heat exchange pipe is wound spirally around the steel pipe pile. There is a geothermal steel pipe pile (Patent Document 2) that performs heat exchange with geothermal heat.

JP 2007-10275 A JP 2005-188866 A

  However, in the method (1) of burying a pipe in the horizontal direction, since a hole for burying the pipe has to be excavated over a wide range, cost and man-hours are required, and the range for burying is widened. There is. Further, in the method (2) of embedding a pipe whose tip is bent into a U-shape during construction of the foundation pile, there is a problem that the contact area between the pipe and the ground cannot be made large and the efficiency is poor. Furthermore, it is difficult to install the pipe, and there is a problem that a dedicated part must be used.

  Further, in the heat exchanger according to Patent Document 1 of (3), since the pipe is formed in a spiral shape, the buried area can be made relatively small, and the contact area between the pipe and the ground can be made relatively large, so that the heat exchange in the design can be performed. Although the efficiency is good, there is a problem that it is difficult to process the pipe into a spiral shape. In addition, in order to maintain the shape even when buried, there is a problem that a material having a certain degree of strength, such as a metal pipe, must be selected and the cost is high.

  Furthermore, in each process, installation, and embedding process, there is a problem that the pitch of the spiral pipe changes due to deformation or the like, and the heat exchange efficiency as designed cannot be obtained. In particular, since the pitch of the spiral shape changes due to deformation or the like, the heat exchange efficiency per unit length is low because the pitch between the pipes cannot be reduced in order to prevent a decrease in heat exchange efficiency due to contact between the pipes. .

  Moreover, although the geothermal utilization steel pipe pile which wound the pipe for heat exchange by (4) of the patent document spirally is a thing which screws a steel pipe pile into the ground in the state which wound the pipe spirally, patent document 1 As with heat exchangers, the pitch of the spiral pipe changes due to deformation, etc. during installation, and heat exchange efficiency as designed cannot be obtained, and there is a risk of contact between pipes, so the pipe pitch is reduced There is a problem that the heat exchange efficiency per unit length is low.

  The present invention has been made in view of such a problem, and there is no risk of occurrence of a pitch shift of the pipe of the heat exchanger, the manufacture is easy, and the installation at the time of installation is also easy and highly efficient. The purpose is to provide vessels.

  In order to achieve the above-mentioned object, the first invention comprises an outer tube having a spiral corrugated portion and an inner tube provided inside the outer tube, and a trough portion of the corrugated portion of the outer tube. The contact portion between the inner surface and the outer peripheral surface of the inner tube is fused, and the space between the inner surface of the crest portion of the outer tube and the outer peripheral surface of the inner tube becomes a fluid flow path, and is integrally formed A resin-made double pipe, a pair of fluid pipe connecting portions covering the outer circumference of the double pipe, and a plurality of fluid pipes connected to the fluid pipe connecting portion, and communicating with the flow path When the fluid is introduced from one of the fluid pipes, the fluid flows through the flow path and is discharged from the other fluid pipe.

  An inner surface of the fluid pipe connecting portion is in contact with an outer peripheral surface of the peak portion, and a hole is formed in a part of the outer pipe at a portion covered with the fluid pipe connecting portion, and the fluid pipe connecting portion The space formed between the inner surface of the valley and the outer peripheral surface of the valley portion and the flow path communicate with each other, whereby the fluid pipe and the flow path communicate with each other through the space and the hole, A seal that seals the space on both sides of the hole and seals the flow path on one side from the hole so that the fluid introduced from the fluid pipe flows in one direction of the flow path. It is desirable to provide a stop material.

  The fluid pipe connecting portion is a ring-shaped member that covers the outer periphery of the double pipe, the inner surface of the ring-shaped member is in contact with the outer peripheral surface of the peak portion, and the outer peripheral surface of the ring-shaped member is A fluid pipe is connected, and the pair of ring-shaped members are placed on the outer periphery of the double pipe at a predetermined interval, and the fluid introduced from the fluid pipe provided in one of the ring-shaped members is , Flows into the channel through the hole, flows in the channel in the direction of the other ring-shaped member, and is discharged from the fluid pipe connected to the other ring-shaped member through the hole. The inside of the inner tube and the fluid may be heat exchangeable. The fluid pipe connected to the outer peripheral surface of the ring-shaped member may be provided at the center of the circular cross section of the outer peripheral surface of the ring-shaped member.

  The fluid pipe connecting portion is a lid-like member that covers both ends of the double pipe, and the inner surface of the lid-like member is in contact with the outer peripheral surface of the mountain portion, and the end of the double pipe is The fluid pipe is a first fluid pipe and a second fluid pipe respectively formed on an outer peripheral surface and an end surface of one of the lid-like members, and the fluid introduced from the first fluid pipe is: Flows into the flow path through the hole, flows through the flow path in the direction of the other lid-shaped member, flows into the double pipe through the other lid-shaped member, And the fluid is discharged from the second fluid pipe, and heat exchange is possible between the outside of the outer pipe and the fluid.

  According to the first invention, since the inner tube and the outer tube are integrally formed by fusing with each other, the structure is simple and the manufacture is easy. In addition, the portion with a spiral wave surrounded by the outer tube and the inner tube becomes the flow channel, and the outer tube and the inner tube are fused, so that the fluid surely flows along the flow channel, and the fluid epidemic path Long length can be secured and heat exchange efficiency is excellent. Further, the pitch of the flow path does not change.

  In particular, the fluid pipe connection portion is covered so as to contact the outer peripheral surface of the crest portion of the outer tube, and a hole is formed in a part of the outer pipe (crest portion) at the portion where the fluid pipe connection portion is covered. Since the sealing material is provided so that the fluid flowing in from the pipe surely flows into the flow path and does not flow to other parts, the fluid can surely flow into the flow path in a desired direction. .

  In addition, the fluid pipe connecting portion is a ring-shaped member that covers the outer periphery of the double pipe at a predetermined interval, and the fluid introduced from the fluid pipe provided on one ring-shaped member passes through the hole. If it flows into the flow path, flows in the flow path in the direction of the other ring-shaped member, and is discharged from the fluid pipe connected to the other ring-shaped member through the hole, the fluid flows in the range in which the fluid flows. The heat exchange with the inside of the inner tube can be performed. For example, the heat generation and heat exchange of the electric wire inserted into the inside of the inner tube can be performed.

  Further, the fluid pipe connecting portion is a lid-like member that covers both ends of the double pipe, and the first fluid pipe and the second fluid pipe are connected to the outer peripheral surface and the end face of the one lid-like member, respectively. The fluid introduced from the first fluid pipe flows into the flow path through the hole, flows through the flow path in the direction of the other lid-shaped member, and enters the double pipe through the other lid-shaped member. If it flows in, flows through the inside of the double pipe and is discharged from the second fluid pipe, the fluid can efficiently exchange heat with the outside of the outer pipe. Exchanges can also be made.

  The second invention uses the heat exchanger described above, circulates fluid through the fluid pipe by a pump, and an electric wire is inserted into the double pipe, and the fluid flowing through the fluid pipe A heat exchanging system characterized by exchanging heat with heat.

  According to the second invention, the fluid can be flowed in an arbitrary place and an arbitrary range where the electric wires are installed, and heat exchange can be performed efficiently.

  A third invention uses the heat exchanger described above, circulates fluid in the fluid pipe by a pump, the heat exchanger is buried in the ground, and the fluid flowing through the fluid pipe exchanges heat with geothermal heat. It is the heat exchange system characterized by this.

  According to the third invention, the heat exchanger can be efficiently exchanged with the geothermal heat by burying the heat exchanger in the ground.

  4th invention consists of the outer tube | pipe which has a spiral corrugated part, and the inner tube provided in the inside of the said outer tube, The inner surface of the trough part of the corrugated part of the said outer tube, and the outer periphery of the said inner tube | pipe The contact portion with the surface is fused, and the electric wire is connected to the integrally formed resin double tube in which the fluid passage is between the inner surface of the crest portion of the outer tube and the outer peripheral surface of the inner tube. A pair of holes are formed in the outer pipe of the double pipe at a predetermined interval, the holes are communicated with each other via the flow path, and the valleys are formed so as to surround the holes. A sealing material is provided on the outer surface, and a sealing material is provided from the hole in the flow path in a direction opposite to the direction in which the holes communicate with each other, and the hole on the outer periphery of the double pipe is formed. A ring-shaped member to which a fluid pipe is connected is provided at each of the sites. The heat exchanging system construction method is characterized in that:

  According to 4th invention, a heat exchanger can be easily installed also about existing electric wire piping, and a heat exchanger can be formed with respect to arbitrary places and ranges.

  ADVANTAGE OF THE INVENTION According to this invention, there is no possibility that the pitch shift of the pipe of a heat exchanger etc. may arise, manufacture is easy, and also the construction at the time of installation is easy, and a highly efficient heat exchanger etc. can be provided.

The front view which shows the heat exchanger 1. FIG. FIG. 3 is an axial sectional view showing the heat exchanger 1. It is the figure which shows the fluid pipe connection part 5a vicinity (the A section enlarged view of FIG. 2), (a) is the figure which saw through the fluid pipe connection part 5a, (b) is the figure which saw through a part of peak part further. The figure which shows the flow of the fluid of the heat exchanger. The figure which shows the installation process of the heat exchanger 1. FIG. The figure which shows the heat exchange system 26. FIG. The front view which shows the heat exchanger 30. FIG. FIG. 3 is an axial sectional view showing the heat exchanger 30. It is the figure which shows the fluid pipe connection part 5c vicinity (I part enlarged view of FIG. 7), (a) is the figure which saw through the fluid pipe connection part 5c, (b) is the figure which saw through a part of peak part further. The figure which shows the flow of the fluid of the heat exchanger. The figure which shows the heat exchange system 41. FIG. An axial direction sectional view showing heat exchanger 1a. It is the figure which shows the fluid pipe connection part 5a vicinity (A1 part enlarged view of FIG. 13), (a) is the figure which saw through the fluid pipe connection part 5a, (b) is the figure which saw through a part of peak part further. The figure which shows the double tube 50. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing the heat exchanger 1, and FIG. 2 is an axial sectional view showing the heat exchanger 1. The heat exchanger 1 mainly includes a double pipe 3, fluid pipe connection portions 5a and 5b, fluid pipes 7a and 7b, and the like.

  The double tube 3 has an inner tube 3a provided therein and an outer tube 3b formed integrally therewith. The inner tube 3a is a cylindrical body, and the inner surface is substantially smooth. The outer tube 3b is a spiral corrugated tube, and the peak portion 11 and the valley portion 13 are formed in a spiral shape. That is, the double pipe 3 is constituted by an inner pipe 3a having a substantially straight pipe, and an outer pipe 3b which is a spiral grooved pipe is integrally joined to the outer periphery of the inner pipe 3a.

  As shown in FIG. 2, the inner peripheral surface of the valley portion 13 of the outer tube 3b is fused to the outer peripheral surface of the inner tube 3a. Therefore, a space surrounded by the outer peripheral surface of the inner tube 3a and the inner peripheral surface of the peak portion 11 is formed in a spiral shape on the outer periphery of the inner tube 3a. A space surrounded by the outer peripheral surface of the inner tube 3a and the inner peripheral surface of the mountain portion 11 becomes a flow path through which a fluid described later flows (hereinafter simply referred to as “flow path”). The double pipe 3 may be made of, for example, resin, and preferably made of polyethylene. For example, the double pipe can be integrally and continuously formed by an extruder by sucking the resin extruded to the outer periphery of the inner pipe in a mold.

  At both ends of the double pipe 3, fluid pipe connecting portions 5a and 5b are provided, respectively. The fluid pipe connecting portions 5 a and 5 b are lid-like members and are put on both ends of the double pipe 3. The inner surfaces of the fluid pipe connection portions 5a and 5b are in contact with the outer peripheral surface (the top portion of the peak portion 11) of the double pipe 3. The inner surfaces of the fluid pipe connection portions 5a and 5b and the outer peripheral surface of the double pipe 3 need to be kept watertight. If necessary, the inner faces of the fluid pipe connection portions 5a and 5b and the double pipe 3 can be maintained. Are joined to each other by adhesion or the like. Various materials such as resin and metal can be selected for the fluid pipe connecting portions 5a and 5b.

  A joint 9a is provided on the side surface (the outer peripheral surface in the radial direction of the double pipe) of one fluid pipe connection portion 5a, and the fluid pipe 7a is connected to the joint 9a. That is, the fluid pipe 7a communicates with the inside of the fluid pipe connecting portion 5a. Similarly, a joint 9b is provided on the end face of the fluid pipe connecting portion 5a (the end face in the axial direction of the double pipe), and the fluid pipe 7b is connected to the joint 9b. The joints 9a and 9b and the fluid pipes 7a and 7b can be selected from various materials such as resin and metal.

  The other fluid pipe connecting portion 5b is put on the end of the double pipe 3, and at this time, as shown in FIG. 2, the end face (inner surface) of the fluid pipe connecting portion 5b and the end of the double pipe 3 in the axial direction are provided. A clearance is formed between the two. Therefore, the flow path described above communicates with the inside of the inner pipe 3a through the clearance with the fluid pipe connecting portion 5b.

  FIG. 3 is an enlarged view of a portion A in FIG. FIG. 3A is a perspective view of the fluid pipe connecting portion 5a, and FIG. 3B is a state in which a part of the outer pipe 3b (near the top of the mountain portion 11) is further excised (see through). FIG. As shown to Fig.3 (a), the joint 9a position (dotted line circle in a figure) is located in the approximate middle of the peak parts of the peak part 11 adjacent in a double pipe axial direction.

  As shown in FIG. 3 (b), the inner peripheral surface of the fluid pipe connecting portion 5a and the top of the mountain portion 11 come into contact with each other and watertightness is maintained. Therefore, a portion surrounded by the inner peripheral surface of the fluid pipe connecting portion 5a and the outer pipe 3b (the valley portion 13) is a spiral space 18. Therefore, simply by covering the fluid pipe connection portion 5 a, the fluid flows along the space 18 when the fluid flows into the fluid pipe connection portion 5 a from the joint 9 a.

  On the other hand, in this invention, the sealing material 15a is provided so that a part of space may be plugged up. The space between the outer peripheral surface of the outer tube 3b and the inner surface of the fluid pipe connecting portion 5a is kept watertight by the sealing material 15a. The sealing material 15a is formed in each space 18 so as to sandwich the communicating portion with the joint 9a. That is, the sealing material 15a is provided in the space 18 on both sides when viewed from the position of the joint 9a.

  In the range of the space 18 surrounded by the sealing material 15a, a hole 17 is formed in a part of the outer tube 3b (side surface of the mountain portion 11). That is, when a fluid is caused to flow into the fluid pipe connecting portion 5a from the joint 9a, the fluid passes through the hole 17 from the space 18 surrounded by the inner surface of the fluid pipe connecting portion 5a, the sealing material 15a, and the outer pipe 3b, and the flow path. Between the outer tube 3b and the inner tube 3a. At this time, the sealing material 15a prevents the fluid from flowing on the outer surface of the outer tube 3b and outflowing to the other. In addition, in order to keep watertight by the fluid pipe connection part 5a, the length of the fluid pipe connection part 5a needs to cover the space 18 completely.

  Further, as shown in FIG. 3B, a sealing material 15b is also provided inside the flow path. As described above, all of the fluid flowing into the fluid pipe connecting portion 5a from the joint 9a flows into the flow path, but in order to flow the fluid in one direction, the other flow path is sealed with the sealing material 15b. is there. That is, the flow path on the other side is kept watertight by the sealing material 15b. In addition, since the position where the sealing material 15b is provided is opposite to the direction in which the fluid flows with respect to the hole 17, as shown in FIG. 1 and the like, it communicates with the fluid pipe connecting portion 5b on the other side. What is necessary is just to provide in the flow path on the opposite side to a direction. The sealing material 15b may be inserted from the hole 17.

  With the configuration as described above, the fluid flowing through the fluid pipe 7a and flowing into the fluid pipe connecting portion 5a through the joint 9a flows into the flow path from the hole 17, and one of the fluid flows in the flow path. It flows in the direction (to the other fluid pipe connecting part 5b side) (in the direction of arrow D in FIG. 3B). As the sealing materials 15a and 15b, a sealing member such as a resin, a putty, a water-expandable member, or the like may be used alone or in combination.

  Next, the flow of fluid in the heat exchanger 1 will be described. FIG. 4 is a diagram illustrating the flow of fluid in the axial cross section of the heat exchanger 1. The fluid flowing in the direction of the heat exchanger 1 through the fluid pipe 7a (in the direction of arrow C in the figure) flows into the fluid pipe connection portion 5a through the joint 9a as described above, and all flows into the flow path through the holes 17. (Arrow D direction in the figure).

  The fluid that has flowed into the flow path spirally flows through the flow path between the inner pipe 3a and the outer pipe 3b of the double pipe 3 and flows to the other end side (the fluid pipe connecting portion 5b side) (arrow E in the figure). direction). When reaching the end of the double pipe 3 in the axial direction, the fluid in the flow path flows out of the flow path, passes through the clearance between the fluid pipe connecting portion 5b and the end of the double pipe 3, and the inside of the double pipe 3 (inside (In the direction of arrow F in the figure). The space between the inner surface of the fluid pipe connecting portion 5b and the double pipe 3 (outer pipe 3b) is closed with a sealing material, a spiral packing, or the like so that all the fluid flows into the inner pipe 3a.

  The fluid that has flowed into the inner pipe 3a flows in the direction toward the end on the fluid pipe connecting portion 5a side (in the direction of arrow H in the figure), and flows out to the fluid pipe 7b through the joint 9b. The inner surfaces of the fluid pipe connection portions 5a and 5b are at least two peaks in the axial direction of the double pipe 3 so that all the fluid from the inside of the inner pipe 3a flows from the joint 9b to the fluid pipe 7b. The fluid is sealed so as not to flow out of the double pipe 3 by the sealing material 15a and the like mentioned above.

  When the fluid flows through the flow path, heat outside the heat exchanger 1 (outside the outer tube 3b) and the fluid can exchange heat. As the fluid, any fluid can be used as long as it does not cause deterioration of the characteristics of the synthetic resin tube. For example, water diluted with water or antifreeze, or a solution diluted with an organic solvent such as alcohol can be used.

  Next, the installation construction method of the heat exchanger 1 concerning this invention is demonstrated. FIG. 5 is a diagram illustrating a process of installing the heat exchanger 1. First, as shown in FIG. 5A, an excavation hole 23 having a predetermined depth is excavated in the ground 21 at the installation location. The depth of the excavation hole 23 is preferably 3 m or more in order to use geothermal heat.

  Next, as shown in FIG. 5B, the heat exchanger 1 is inserted into the excavation hole 23. At this time, the heat exchanger 1 may be inserted into the cylindrical body 25. When the heat exchanger 1 is inserted into the cylindrical body 25, in order to improve heat conduction between the outer surface of the heat exchanger 1 and the inner surface of the cylindrical body 25, a powdery state is formed in the gap between the outer surface of the heat exchanger 1 and the cylindrical body 25.・ It is desirable to fill with granular heat conduction material.

  Next, as shown in FIG.5 (c), the heat exchanger 1 is backfilled and construction of the heat exchange system 27 is complete | finished. By circulating the fluid through the heat exchanger 1, heat exchange with surrounding geothermal heat can be performed. In addition, since the heat exchanger 1 can be manufactured in advance in a factory or the like, operations such as on-site processing and adjustment are unnecessary.

  FIG. 6 is a diagram illustrating a heat exchange system 26 which is an example of a heat exchange system using the heat exchanger 1. Geothermal heat stays at almost the same temperature throughout the year. In summer, it is cold relative to the outside temperature, and in winter it is warm relative to the outside temperature. For this reason, by circulating the fluid through the heat exchanger 1 and the pipe 28 disposed under the floor 29 by the circulation pump 27, floor cooling and heating using geothermal heat can be performed. Note that one heat exchanger 1 can be provided, but a plurality of the heat exchangers 1 can be connected.

  As described above, according to the heat exchanger 1 according to the first embodiment, highly efficient heat exchange can be easily performed. Since the heat exchanger 1 uses the double pipe 3 formed integrally, a low-cost and long-life heat exchanger can be obtained. In addition, when performing maintenance or replacement of the heat exchanger 1, a new double pipe is provided with a hole and a sealing material, and only the fluid pipe connection portion is connected. An exchanger can be obtained.

  Further, the pitch of the flow path does not change during construction or the like. Further, since the inner tube 3a and the outer tube 3b of the double tube 3 are fused, the fluid surely flows through the flow path and does not cause a shortcut.

  Moreover, in order to embed the heat exchanger 1, it is only necessary to excavate a sufficiently large hole for embedding the heat exchanger 1 processed in advance in a factory or the like. There is no need to drill a hole deeper than necessary, easy insertion, and the heat exchanger embedding can be reduced.

  Next, a second embodiment will be described. FIG. 7 is a front view showing the heat exchanger 30, and FIG. 8 is an axial sectional view showing the heat exchanger 30. In the following embodiments, the same functions as those of the heat exchanger 1 are denoted by the same reference numerals as those in FIG. The heat exchanger 30 has substantially the same configuration as the heat exchanger 1, but the structure of the fluid pipe connecting portion is different.

  A pair of fluid pipe connection portions 5c, which are ring-shaped members, are provided on the outer periphery of the double pipe 3 with a predetermined interval. As the fluid pipe connecting portion 5c, for example, a member divided into two may be joined to form a ring-shaped member. Joints 9a and 9b are joined to the outer peripheral surface of the fluid pipe connecting portion 5c, and fluid pipes 7a and 7b are connected to the joints 9a and 9b, respectively.

  In addition, as the double tube 3, a protective tube for an electric cable can be applied. That is, as shown in FIG. 8 and the like, the electric wire 31 is inserted into the double pipe 3 (inner pipe 3a).

  FIG. 9 is an enlarged view of a portion I in FIG. FIG. 9A is a perspective view of the fluid pipe connecting portion 5c, and FIG. 9B is a state in which a part of the outer pipe 3b (near the top of the mountain portion 11) is further excised (see through). FIG. As shown to Fig.9 (a), the joint 9a position (dotted line circle in a figure) is located in the approximate middle of the peak parts of the peak part 11 adjacent to an axial direction.

  The inner peripheral surface of the fluid pipe connection part 5c on one side and the top part of the peak part 11 are brought into contact (or bonded) to maintain watertightness. The inner surface of the fluid pipe connecting portion 5c is brought into contact with at least two peaks in the axial direction of the double pipe 3. A portion surrounded by the inner peripheral surface of the fluid pipe connecting portion 5 c and the outer pipe 3 b (the valley portion 13) is a spiral space 18. As in the case of the heat exchanger 1, a sealing material 15 a is provided in the space 18 so as to block a part of the space 18. The space between the outer peripheral surface of the outer tube 3b and the inner surface of the fluid pipe connecting portion 5a is kept watertight by the sealing material 15a. The sealing material 15a is formed in the space 18 on both sides of the joint 9a so as to sandwich the communicating portion with the joint 9a.

  In the range of the space 18 surrounded by the sealing material 15a, a hole 17 is formed in a part of the outer tube 3b (side surface of the mountain portion 11). That is, when a fluid is caused to flow into the fluid pipe connecting portion 5a from the joint 9a, the fluid passes through the hole 17 from the space surrounded by the inner surface of the fluid pipe connecting portion 5a, the sealing material 15a, and the outer pipe 3b, and flows in the flow path. It flows between an outer tube 3b and an inner tube 3a. At this time, the sealing material 15a prevents the fluid from flowing on the outer surface of the outer tube 3b and outflowing to the other.

  Further, as shown in FIG. 9B, a sealing material 15b is also provided inside the flow path. Since the position where the sealing material 15b is provided is opposite to the direction in which the fluid flows with respect to the hole 17, as shown in FIG. 7 and the like, the direction communicating with the fluid pipe connecting portion 5c on the other side May be provided in the flow path on the opposite side.

  With the configuration as described above, the fluid flowing through the fluid pipe 7a and flowing into the fluid pipe connecting portion 5c through the joint 9a flows all into the flow path from the hole 17, and one of the flow paths flows through the flow path. Flows in the direction (to the other fluid pipe connecting portion 5c side) (in the direction of arrow L in FIG. 9B). The same configuration is formed on the other fluid pipe connecting portion 5c side symmetrically with the above-described one side fluid pipe connecting portion 5c. That is, the hole 17 and the sealing materials 15a and 15b are similarly formed on the other fluid pipe connection portion 5c side.

  Next, the flow of fluid in the heat exchanger 30 will be described. FIG. 10 is a diagram illustrating a fluid flow in the axial cross section of the heat exchanger 30. The fluid flowing in the direction of the heat exchanger 30 through the fluid pipe 7a (in the direction of arrow K in the figure) flows into the fluid pipe connection portion 5c on one side via the joint 9a as described above, and flows through the hole 17 as a flow path. It flows all in (in the direction of arrow L in the figure).

  The fluid that has flowed into the flow path spirally flows through the flow path between the inner pipe 3a and the outer pipe 3b of the double pipe 3 and flows to the other end side (the other fluid pipe connecting portion 5c side) (in the drawing). Arrow M direction). When reaching the end of the double tube 3 in the axial direction, the fluid in the flow channel flows out from the hole formed in the outer tube 3b (in the direction of arrow N in the figure). All of the fluid that has flowed out flows out into the joint 9b and out into the fluid pipe 7b.

  When the fluid flows through the flow path, heat generation from the electric wire inside the heat exchanger 1 (inside the inner tube 3a) and heat exchange with the fluid can be performed.

  In addition, although the heat exchanger 30 can also be manufactured in a factory etc. previously, it can also be installed also with respect to the existing double tube by which the electric wire was penetrated inside. Although the construction method is the same as that of the heat exchanger 1, the double pipe 3 may be long and can be installed in an arbitrary range in the longitudinal direction of the long double pipe.

  Next, the heat exchange system 41 using the heat exchanger 30 will be described. FIG. 11 is a schematic diagram of a heat exchange system 41 that uses the heat exchanger 30 for the purpose of underfloor cooling and heating. The heat exchanger 30 is embedded in the ground 35, for example. The fluid pipe connecting portion 5c and the like are connected to the double pipe through which the electric wire 31 embedded under the ground 35 passes, and the heat exchanger 30 is provided.

  The heat exchanger 30 is connected to the circulation pump 33 and further connected to the pipe 37. The circulation pump 33 circulates the fluid in the heat exchanger 30 and the pipe 37. The fluid flowing through the heat exchanger 30 exchanges heat with the heat generated by the electric wires 31. The fluid after the heat exchange is flowed to the pipe 37 arranged under the floor, and floor heating can be performed. In the heat exchange system 41, an example in which a plurality of heat exchangers 30 are provided has been shown. However, if the interval between the fluid pipe connection portions 5c is widened, a large heat exchange may be performed by one heat exchanger 30. it can.

  According to the second embodiment, an effect similar to that of the first embodiment can be obtained. Further, the heat generated by the electric wire can be used effectively. Moreover, it can also install in an existing conduit, and an installation position and an installation range can be determined arbitrarily. For this reason, the heat exchange system excellent in workability can be obtained.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, the heat exchange system using each heat exchanger is not limited to the above-described example, and can be applied to various structures such as other structures, roads, greenhouses, and pools.

  Moreover, in the above embodiment, although the outer tube | pipe which has a spiral corrugated part showed the example whose peak part (valley part) is one continuous spiral shape, a plurality of spiral waves were shown. Shapes (mountains, valleys) can also be provided so that the respective waves are parallel. That is, adjacent spiral peaks (valleys) are formed in parallel to each other, and each forms an independent flow path. Even in this case, it can be configured in the same manner as the heat exchanger 1 described above.

  FIG. 12 is a view showing a heat exchanger 1a using a double pipe 4 having an outer pipe provided with a plurality of spiral grooves. The double tube 4 is a spiral corrugated tube, and has substantially the same configuration as the double tube 3, but the spiral wave shape is different. Unlike the double tube 3, the double tube 4 is not a continuous form of one spiral, but two spiral shapes are provided in parallel. In addition, as the double tube 4, an example of two spiral shapes is shown, but there may be three or more.

  Two independent spiral shapes (valleys and peaks) are formed on the outer tube of the double tube 4. Therefore, two flow paths are formed. For this reason, the heat exchanger 1a is provided with a pair of fluid pipes 7a for supplying fluid to the respective flow paths. That is, the number of fluid pipes 7a corresponding to the number of flow paths is provided in the fluid pipe connection portion 5a.

  FIG. 13 is an enlarged view of a portion A1 in FIG. 12, and shows the heat exchanger 1a in the same manner as in FIG. As shown to Fig.13 (a), in the heat exchanger 1a, the joint 9a (dotted line circle in a figure) is each provided in the approximate center of each trough part 13 adjacent. That is, the joint 9a is located in each of the adjacent valley portions 13 (substantially intermediate between the top portions of the mountain portions 11). In addition, the joint 9a should just be connected to each trough part 13, and may be formed in the position where the circumferential direction differs.

  As shown in FIG. 13 (b), the inner peripheral surface of the fluid pipe connecting portion 5a and the top of the mountain portion 11 are brought into contact with each other to maintain watertightness, and the inner peripheral surface of the fluid pipe connecting portion 5a and the outer pipe 3b (the valley portion 13). ) Is a spiral space 18. In the space 18, a sealing material 15 a is provided so as to sandwich a communication portion with the joint 9 a. That is, the adjacent valley portions 13 are sealed by the sealing material 15a, and independent spaces 18 are formed. The space between the outer peripheral surface of the outer pipe 3b and the inner surface of the fluid pipe connecting portion 5a is kept watertight. That is, the sealing material 15a is provided in the space 18 on both sides when viewed from the position of the joint 9a.

  In the range of each space 18, a hole 17 is formed in a part of the outer tube 3 b (side surface of the mountain portion 11). That is, when a fluid is caused to flow into the fluid pipe connecting portion 5a from each joint 9a, the fluid passes through the holes 17 from the respective spaces 18 surrounded by the inner surface of the fluid pipe connecting portion 5a, the sealing material 15a, and the outer pipe 3b. And flows into the respective flow paths. At this time, the sealing material 15b is also provided inside each flow path. Accordingly, all of the fluid flowing from the joint 9a into the fluid pipe connection portion 5a can flow in one direction (the fluid pipe connection portion 5b side). As described above, fluids can be made to flow through the independent flow paths.

  In addition, since the fluid pipe connection part 5a needs to keep the fluid flowing with respect to each flow path watertight, it is necessary to cover all the space 18 with respect to each flow path. Therefore, in the case of two flow paths, the flow paths (peaks or troughs) are formed across the four peaks (valleys) when going around the outer periphery of the double pipe. Therefore, the fluid pipe connecting portion 5a needs to have a length that covers at least the wave pitch (pitch between adjacent ridges) twice as many as the number of the flow paths, and preferably 1 to 2 pitches. It is desirable to make it longer.

  On the fluid pipe connection portion 5b side, as long as each flow path communicates with the fluid pipe connection portion 5b, the fluid that has flowed through each flow path is the same as that of the heat exchanger 1, as shown in FIG. 5b joins, flows through the double pipe 4 (inner pipe 3a), and flows out of the heat exchanger 1a.

  In addition, when the fluid pipe connection part 5b side of one flow path does not communicate with the inside of the fluid pipe connection part 5b, a hole is provided on the side surface of the flow path to double the fluid, similarly to the entrance side of the flow path. What is necessary is just to derive | lead-out to the exterior of the pipe | tube 4 and to flow in into the fluid pipe | tube connection part 5b. In this case, as with the fluid inflow side, the sealing material 15b or the like is formed for sealing the flow path, so that the fluid can be entirely led out from the hole and sealed on one side of the valley. By providing the material 15a, all the fluid can flow to the end side (the end side of the fluid pipe connecting portion 5b), and the fluid does not leak from the fluid pipe connecting portion 5b.

  In this way, by using a plurality of flow paths formed between the undulating portion and the inner tube, the fluid cross-sectional area in the flow path can be increased by the number of the flow paths. Since it is not necessary to increase the flow velocity of the fluid, a margin can be given to the strength of the fusion part between the outer tube and the inner tube.

  In addition, if the length of the heat exchanger is the same, the flow resistance can be reduced because the length of each flow path is shortened by using a plurality of flow paths. Needless to say, a configuration having a plurality of flow paths as described above can be applied to each of the above-described embodiments. For example, when applied to the heat exchanger 30, it is sufficient to form the fluid pipes 7a and 7b as many as the number of flow paths.

  In the above description, the example in which the double pipes 3 and 4 having a gentle wave shape is used has been shown. However, instead of the double pipes 3 and 4, a double pipe as shown in FIG. A tube 50 may be used. FIG. 14 is a view showing a cross section of the double tube 50. The double tube 50 may have a substantially trapezoidal (substantially rectangular) corrugated shape in which the crests 11 and the troughs 13 are substantially straight, and the crests 11 and the troughs 13 are joined in a substantially straight line. By setting it as such a wave shape, since the whole trough part contributes as an adhesion part length of an outer pipe and an inner pipe, the adhesive strength of an outer pipe and an inner pipe can be improved.

  Moreover, although the example of adhesion | attachment was shown as a method of keeping the inner surface of fluid pipe connection part 5a, 5b, 5c watertight with the crest part of a double pipe, on the outer periphery of fluid pipe connection parts 5a, 5b, 5c, A band or the like may be provided and tightened, or may be combined with adhesion or the like. Further, packing for keeping water tightness may be used.

1, 1a, 30 ... Heat exchangers 3, 4, 50 ... Double pipe 3a ... Inner pipe 3b ... Outer pipes 5a, 5b, 5c ... Fluid pipe connections 7a, 7b ... ...... Fluid pipes 9a, 9b ......... Joint 11 ......... Mountain 13 ......... Valley 15a, 15b ......... Sealing material 17 ......... Hole 18 ......... Space 21 ......... Ground 23 ... ... excavation hole 25 ... ... cylinder 26 ... ... heat exchange system 27 ... ... circulation pump 28 ... ... pipe 29 ... ... floor 31 ... ... electric wire 33 ... ... circulation pump 35 ... ... ground 37 ... ...... Pipe 39 ......... Structure 41 ......... Heat exchange system 43 ......... Coated cable

Claims (7)

An outer tube having a spiral corrugated portion and an inner tube provided inside the outer tube, and a contact portion between the inner surface of the valley portion of the corrugated portion of the outer tube and the outer peripheral surface of the inner tube A resin-made double pipe formed integrally, which is fused and has a fluid flow path between the inner surface of the crest of the outer pipe and the outer peripheral face of the inner pipe;
A pair of fluid pipe connecting portions covering the outer circumference of the double pipe;
A plurality of fluid pipes connected to the fluid pipe connecting portion,
When a fluid is introduced from one of the fluid pipes communicating with the flow path, the fluid flows through the flow path and is discharged from the other fluid pipe. The inner surface of the fluid pipe connecting portion is in contact with the outer peripheral surface of the mountain portion,
In the portion covered with the fluid pipe connection part, a hole is formed in a part of the outer pipe, and a space formed between the inner surface of the fluid pipe connection part and the outer peripheral surface of the valley part, By communicating with the flow path, the fluid pipe and the flow path communicate with each other through the space and the hole,
The space on both sides of the hole is sealed so that the fluid introduced from the fluid pipe flows in one direction of the flow path, and the flow path on one side from the hole is sealed. The heat exchanger according to claim 1, wherein a sealing material is provided. The fluid pipe connecting portion is a ring-shaped member that covers the outer periphery of the double pipe, the inner surface of the ring-shaped member is in contact with the outer peripheral surface of the peak portion, and the outer peripheral surface of the ring-shaped member is Fluid pipe is connected,
The pair of ring-shaped members are placed on the outer periphery of the double pipe with a predetermined interval, and the fluid introduced from the fluid pipe provided in one of the ring-shaped members is allowed to flow through the holes. Flows into the passage, flows in the flow path in the direction of the other ring-shaped member, is discharged from the fluid pipe connected to the other ring-shaped member through the hole, The heat exchanger according to claim 2, wherein heat exchange is possible. The fluid pipe connecting portion is a lid-like member that covers both ends of the double pipe, and the inner surface of the lid-like member is in contact with the outer peripheral surface of the mountain portion, and the end of the double pipe is Plug,
The fluid pipes are a first fluid pipe and a second fluid pipe respectively formed on an outer peripheral surface and an end surface of one of the lid-like members,
The fluid introduced from the first fluid pipe flows into the flow path through the hole, flows through the flow path in the direction of the other lid-like member, and passes through the other lid-like member. The heat according to claim 2, wherein the heat flows into the double pipe, flows through the double pipe and is discharged from the second fluid pipe, and heat exchange is possible between the outside of the outer pipe and the fluid. Exchanger. Using the heat exchanger according to claim 3,
Circulating a fluid through the fluid pipe by a pump;
An electric wire is inserted into the double pipe, and a fluid flowing through the fluid pipe exchanges heat with heat generated by the electric wire. Using the heat exchanger according to claim 4,
Circulating a fluid through the fluid pipe by a pump;
The heat exchanger is embedded in the ground, and the fluid flowing through the fluid pipe exchanges heat with geothermal heat. An outer tube having a spiral corrugated portion and an inner tube provided inside the outer tube, and a contact portion between the inner surface of the valley portion of the corrugated portion of the outer tube and the outer peripheral surface of the inner tube Fusing and inserting a wire through a resin-made double tube formed integrally, the fluid passage between the inner surface of the crest of the outer tube and the outer peripheral surface of the inner tube,
A pair of holes are formed at a predetermined interval in the outer pipe of the double pipe, and the holes are communicated with each other via the flow path.
A sealing material is provided on the outer surface of the trough so as to surround each hole, and a sealing material is provided from the hole in the flow path in a direction opposite to the direction in which the holes communicate with each other. ,
A method for constructing a heat exchange system, wherein a ring-like member to which a fluid pipe is connected is provided at each portion where the hole on the outer periphery of the double pipe is formed.

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