JP2007132536A - U-shaped tube for underground heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To collect the heat of an inflow tube and an outflow tube heated by soil heat, by a heat medium with high efficiency. <P>SOLUTION: This U-shaped tube 10 comprises the inflow tube 11 for allowing the heat medium F to flow from a ground surface L side toward an underground side, and the outflow tube 12 for allowing the heat medium F passing through the inflow tube 11 to flow from the underground side toward the ground surface L side, and the heat of the inflow tube 11 and the outflow tube 12 heated by soil heat is collected by the heat medium F by allowing the heat medium F to successively pass through the inflow tube 11 and the outflow tube 12. A guide member 13 is mounted to at least one of the inflow tube 11 and the outflow tube 12 to guide the heat medium F toward its inner peripheral face. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a U-shaped tube for a ground heat exchanger used in a ground heat exchanger that serves as a heat source for, for example, a building air conditioner.

As this type of underground heat exchanger U-tube, conventionally, for example, as shown in Patent Document 1 below, an inflow pipe for flowing a heat medium from the ground surface toward the underground side, and heat that has passed through the inflow pipe An outflow pipe for flowing the medium from the underground side toward the ground surface side, and the heat medium sequentially passes through the inflow pipe and the outflow pipe to thereby heat the inflow pipe and the outflow pipe heated by the underground heat. There is known a configuration in which is recovered by a heat medium.
Japanese Patent Laid-Open No. 11-182943

  However, in recent years, there is an increasing demand for recovering heat of the inflow pipe and the outflow pipe with a heat medium with higher efficiency than the conventional U-shaped pipe for underground heat exchanger.

As means for solving such problems, the flow rate of the heat medium in the inflow pipe and the outflow pipe is slowed to increase the residence time of the heat medium, and the amount of heat that the heat medium receives from these pipes is increased. It is possible. However, in this case, since the flow of the heat medium becomes a laminar flow state, the heat medium in each of the tubes located on the inner peripheral surface of the tube receives a large amount of heat from these tubes. Since the flow becomes so bad that it does not reach the opening on the surface side of the outflow pipe and cannot be recovered, the above-mentioned problems cannot be solved.
On the contrary, if the flow rate of the heat medium is increased, all the heat medium in the pipe including the heat medium located on the inner peripheral surface of each pipe can be flowed well and recovered. On the other hand, the residence time of the heat medium in each of the tubes is shortened, so that a sufficient amount of heat cannot be imparted to the heat medium, and the above problem cannot be solved.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a U-shaped tube for a ground heat exchanger that can recover heat with high efficiency.

  In order to solve the above-described problems and achieve such an object, the U-shaped tube for the underground heat exchanger according to the present invention includes an inflow tube for flowing a heat medium from the ground surface side to the underground side, and the inflow tube. And an outflow pipe for flowing the heat medium from the underground side toward the ground surface side, and the heat medium sequentially passes through the inflow pipe and the outflow pipe so that the inflow pipe heated by the underground heat and A U-shaped pipe for underground heat exchanger in which heat from the outflow pipe is recovered by a heat medium, and guides the heat medium toward at least one of the inflow pipe and the outflow pipe toward an inner peripheral surface thereof Is provided.

  In the present invention, since the guide member is provided, when the heat medium passes through at least one of the inflow pipe and the outflow pipe, the turbulent heat medium can collide with the inner peripheral surface thereof. . That is, it becomes possible to make a heat medium collide with the said internal peripheral surface from the direction which cross | intersects a pipe axis. Therefore, in the process in which the heat medium passes through the inside of the U-tube for the underground heat exchanger, this heat medium can be brought into contact with the inner peripheral surface of the inflow pipe or the outflow pipe heated by the underground heat, In addition, since the heat medium that has received a large amount of heat due to this contact is rebounded radially inward by the inner peripheral surface, it can be recovered without being retained on the inner peripheral surface of each tube, and high efficiency. Heat recovery can be realized.

  Here, the guide member includes a plate-like body in which a shaft provided along the tube axis in the inflow pipe or the outflow pipe is fitted and inserted so as to penetrate the front and back surfaces thereof. The plate-like body may be supported by the shaft so that the front and back surfaces thereof can be inclined with respect to the direction orthogonal to the tube axis.

In this case, when the heat medium passing through the U-tube for the underground heat exchanger collides with the front surface or the back surface of the plate body, the plate material is inclined. Can be guided toward the inner peripheral surface of the inflow pipe or the outflow pipe, and the heat medium can be reliably brought into contact with and recovered from the inner peripheral surface.
In addition, in the process of continuously supplying the heat medium into the U-tube for the heat exchanger, this inclination is returned after the plate-like body is inclined, and a new inclination is made in a direction different from the previously inclined direction. Since this is repeated, the collision speed of the heat medium with respect to the plate-like body may be relatively increased, and in this case, the above-described effects can be reliably achieved.

  Furthermore, when the plate-like body is rotatable around the axis of the shaft, the plate-like body is inclined on the entire circumference regardless of the circumferential position in the rotating direction on the surface of the plate-like body. In the process of continuously supplying the heat medium into the U-tube for heat exchanger, the heat medium can collide evenly over the entire circumference of the inner peripheral surface. Therefore, it is possible to further improve the heat recovery efficiency.

Further, a through hole penetrating in the thickness direction may be formed on the front and rear surfaces of the plate-like body at a position excluding a portion where the shaft is inserted.
In this case, even when a heat medium collides with the surface of the plate-like body and a large load is about to act on the connecting portion between the plate-like body and the shaft, by passing a part of the heat medium through the passage hole, This load can be reduced. Therefore, it becomes possible to prevent that the said connection part becomes easy to break, and it can prevent that durability of this U-tube for underground heat exchangers falls by providing the said guide member.

  According to the present invention, highly efficient heat recovery can be realized.

Hereinafter, an embodiment of a U-tube for underground heat exchanger according to the present invention will be described with reference to FIGS. 1 and 2.
The U-tube 10 for the underground heat exchanger includes an inflow pipe 11 for flowing the heat medium F from the surface L side toward the ground side, and the heat medium F that has passed through the inflow pipe 11 from the underground side to the surface L side. And the heat medium F sequentially passes through the inflow pipe 11 and the outflow pipe 12 so that the heat of the inflow pipe 11 and the outflow pipe 12 heated by the underground heat is used as the heat medium. F is collected.

  In addition, at least one of the inflow pipe 11 and the outflow pipe 12 is provided with a guide member 13 that guides the heat medium F toward the inner peripheral surface thereof. In the example shown in FIG. 1, guide members 13 are provided in the inflow pipe 11 and the outflow pipe 12 at two locations, the ground surface L side and the underground side, respectively. In particular, of the two guide members 13 provided on the outflow pipe 12, the guide member 13 provided on the ground surface L side is located far from the ground surface L by a considerable distance, and this guide member The heat medium F that has passed through 13 is made laminar and then reaches the surface L, and the heat medium F can be prevented from radiating heat.

  Here, in each of the inflow pipe 11 and the outflow pipe 12, a shaft 14 extending from the surface L side toward the ground side along the pipe axis is disposed. In the illustrated example, each shaft 14 is disposed in alignment with each tube axis of the inflow tube 11 and the outflow tube 12.

  Furthermore, in this embodiment, the guide member 13 is a disk-shaped body as shown in FIG. 2, and the shaft 14 is inserted into a through-hole 13a formed at the center in the radial direction. The front and back surfaces of the body are tiltable with respect to the direction orthogonal to the tube axis and supported by the shaft 14. That is, the inner diameter of the through-hole 13a is made larger than the outer diameter of the shaft 14, and the through-hole is disposed at the position where the guide member 13 is disposed on the shaft 14 so as to face the front and back surfaces of the guide member 14. A support member 14a having a diameter larger than the inner diameter of 13a is provided. As a result, the guide member 13 can be tilted by a predetermined angle with respect to the direction orthogonal to the direction in which the shaft 14 extends, and the shaft 14 can move in the axial direction while being rotatable about the shaft 14. It is restrained and attached.

  Further, as shown in FIG. 2, the front and back surfaces of the guide member 13 have a plurality of through holes 13b penetrating in the thickness direction at positions excluding the portion where the shaft 14 is inserted, that is, the central portion in the radial direction. Is formed. Thereby, a part of the heat medium F colliding with the front and back surfaces of the guide member 13 is allowed to pass through the passage hole 13b.

  As described above, according to the U-shaped tube 10 for the underground heat exchanger according to the present embodiment, since the guide member 13 is provided, when the heat medium F passes through the inflow tube 11 and the outflow tube 12, It becomes possible to make the heat medium F in a turbulent state collide with the inner peripheral surface. That is, the heat medium F can collide with the inner peripheral surface from the direction intersecting the tube axis. Therefore, in the process in which the heat medium F passes through the U-tube 10 for the underground heat exchanger, the heat medium F is brought into contact with the inner peripheral surfaces of the inflow pipe 11 and the outflow pipe 12 heated by the underground heat. In addition, since the heat medium F that has received a large amount of heat due to this contact is rebounded radially inward by the inner peripheral surface, the heat medium F is retained on the inner peripheral surfaces of the pipes 11 and 12. It can be recovered without any problem, and highly efficient heat recovery can be realized.

  Further, since the front and back surfaces of the guide member 13 are tiltable with respect to the direction orthogonal to the tube axis, the guide member 13 is inclined when the heat medium F collides with the front surface or the back surface of the guide member 13. Thus, it is possible to reliably realize the contact of the heat medium F with the inner peripheral surfaces of the inflow pipe 11 and the outflow pipe 12 and the recovery of the heat medium F by the front surface or the back surface.

  Further, in the process of continuously supplying the heat medium F, after the guide member 13 is inclined, the inclination is returned, and a new inclination in a direction different from the previously inclined direction is repeated. Therefore, the collision speed of the heat medium F with respect to the guide member 13 may be relatively increased, and in this case, the above-described effects can be reliably achieved.

  Furthermore, in the present embodiment, since the guide member 13 is rotatable around the axis of the shaft 14, the guide member 13 can be rotated on the entire circumference thereof regardless of the circumferential position in the rotating direction on the front and back surfaces of the guide member 13. The guide member 13 can be inclined, and in the process of continuously supplying the heat medium F into the heat exchanger U-tube 10, the heat medium is evenly distributed over the entire circumference of the inner peripheral surface. F can collide. Therefore, it is possible to further improve the heat recovery efficiency.

  Further, since the ventilation hole 13b is formed in the guide member 13, the heat medium F collides with the front surface or the back surface of the guide member 13, and a large load is about to act on the connecting portion between the guide member 13 and the shaft 14. Even in this case, this load can be reduced by passing a part of the heat medium F through the passage hole 13b. Therefore, it is possible to prevent the connecting portion from being easily damaged, and the provision of the guide member 13 can prevent the durability of the U-tube 10 for the underground heat exchanger from being lowered. .

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the configuration in which the guide member 13 is provided in both the inflow pipe 11 and the outflow pipe 12 is shown, but it may be provided in at least one of these pipes 11 and 12. Moreover, although the structure which provided each two guide members 13 in the inflow pipe | tube 11 and the outflow pipe | tube 12 was shown, you may make it provide only one, and may make it provide more than three. The number is not particularly limited.

  Further, the configuration of the guide member 13 is not limited to the above-described embodiment. For example, a screw shaft is disposed in at least one of the inflow pipe 11 and the outflow pipe 12 so that the axis thereof substantially coincides with the pipe axis. Thus, it is also possible to guide the heat medium F along the screw portion of the screw.

  The heat of the inflow pipe and the outflow pipe heated by the underground heat can be recovered with high efficiency by the heat medium.

In one Embodiment which concerns on this invention, it is a longitudinal cross-sectional view of the U-shaped tube for underground heat exchangers. It is a top view of the guide member shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 U-shaped pipe for underground heat exchanger 11 Inflow pipe 12 Outflow pipe 13 Guide member 13b Passing hole 14 Shaft F Heat medium L Ground surface

Claims (3)

An inflow pipe for flowing the heat medium from the surface side toward the ground side and an outflow pipe for flowing the heat medium that has passed through the inflow pipe from the ground side toward the surface side are provided. And the U-tube for the underground heat exchanger in which the heat of the inflow pipe and the outflow pipe heated by the underground heat is recovered by the heat medium by sequentially passing through the outflow pipe,
A U-tube for a ground heat exchanger, wherein a guide member for guiding the heat medium toward an inner peripheral surface thereof is provided on at least one of the inflow tube and the outflow tube. In the U-shaped tube for underground heat exchanger according to claim 1,
The guide member is a plate-like body in which a shaft that extends along the tube axis inside the inflow tube or the outflow tube is fitted and inserted so as to penetrate the front and back surfaces. The plate-like body is supported by the shaft so that its front and back surfaces can be inclined with respect to a direction orthogonal to the tube axis. In the U-shaped tube for underground heat exchanger according to claim 2,
U-tubes for underground heat exchangers, characterized in that on the front and back surfaces of the plate-like body, passage holes penetrating in the thickness direction are formed at positions excluding the portion where the shaft is inserted. .

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