JP2009041231A - Buried heat exchanger and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buried heat exchanger with high heat exchange efficiency, which removes a burden on manufacture and transportation by employing a simple structure. <P>SOLUTION: This buried heat exchanger comprises a lower pipe-like body 2 for being buried in an underground constant-temperature layer, and an upper pipe-like body 3 which is buried in a temperature-changeable layer above the constant-temperature layer and which has a heat exchange ability lower than that of the lower pipe-like body 2. The lower pipe-like body 2 comprises a large-diameter pipe 21 which is formed in the center, a plurality of small-diameter pipes 22 which are formed on the periphery of the large-diameter pipe 21, and a communicating portion 23 for making lower ends of the small-diameter and large-diameter pipes 22 and 21 communicate with one another. The upper pipe-like body 3 has a double pipe structure which is composed of a central pipe 31 and an outer peripheral pipe 32; the central pipe 31 is connected to an upper end of the large-diameter pipe 21; and the outer peripheral pipe 32 communicates with the small-diameter pipe 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an embedded heat exchanger for embedding in the ground and performing air conditioning and the like by heat exchange with the ground, and a method for manufacturing the same.

There is a constant temperature region where the temperature is almost constant regardless of the season or day and night in the fixed depth region of the ground, and various embedded heat exchangers that perform heat exchange using this constant temperature region have been developed. Has been. As a conventional buried heat exchanger of this kind, as described in Patent Documents 1 and 2, a hollow pile made of concrete or steel is buried in the ground, and a U-shaped heat exchange pipe is embedded in the inside. The one inserted is known. In addition, the heat exchange efficiency is low simply by inserting a heat exchange pipe, so the gap space between the hollow pile and the heat exchange pipe is filled with an appropriate material having good thermal conductivity, or the heat exchange pipe In some cases, the forward path portion has a fin shape, or a spiral shape as shown in Patent Documents 3 and 4.
Japanese Unexamined Patent Publication No. 60-8659 JP 2004-233031 A Japanese Patent Laid-Open No. 3-83226 JP-A-11-336008

  However, the conventional buried heat exchanger has the same structure from the bottom to almost the ground surface while aiming to increase the efficiency of heat exchange with the ground. However, heat exchange takes place, which may adversely affect it. That is, the air once cooled (or warmed) in the above-described constant temperature layer in the ground may be reheated (or cooled) near the ground surface.

  Also, to improve the efficiency of heat exchange with the ground, for example, if the heat exchange pipe is made into a fin shape or a spiral shape, it will take a large burden on the manufacturing and it will be necessary to make almost everything in advance at the factory. The trouble of transporting the buried heat exchanger having a length of 10 m or more from the factory to the site becomes serious.

  The present invention has been made to solve such problems, and provides an embedded heat exchanger having a simple structure that does not impose a burden on production and transportation, and has high heat exchange efficiency, and a method for manufacturing the same. This is the main desired task.

  That is, the embedded heat exchanger according to the present invention is embedded in a hole drilled in the ground, and has a columnar embedded heat configured to exchange heat with the ground while the fluid flows through the flow path. It is an exchanger, and almost all of the lower tubular body is embedded in the underground constant temperature layer and the temperature change layer above the constant temperature layer is embedded, and heat exchange is performed more than the lower tubular body. An upper tubular body having a low performance, and the lower tubular body includes a large-diameter tube formed in the center, a plurality of small-diameter tubes formed around the large-diameter tube, the small-diameter tubes, and The upper tubular body has a double tube structure composed of a central tube and an outer peripheral tube, and the central tube is the upper end of the large-diameter tube. And the outer peripheral pipe communicates with the small diameter pipe.

  According to the present invention configured as described above, in the lower tubular body embedded in the constant temperature layer, the small-diameter tube is a straight thin tube, and if a large number of these are provided, the tube can be spiraled or finned as in the past. Therefore, since the surface area can be increased without difficulty by using only a straight pipe, the manufacturing is simple and the cost can be reduced accordingly.

  In addition, the temperature change layer on the earth that is affected by the temperature change on the ground surface has an upper connection pipe that is inferior in heat exchanging capacity, so the heat transfer effect from the temperature change layer can be minimized. On the other hand, since the lower tubular body excellent in heat exchange capacity is embedded in the constant temperature layer of the earth that is hardly affected by the temperature change of the ground surface, the heat transfer efficiency can be increased as much as possible. As a total, ideal heat exchange with the earth can be achieved.

  Furthermore, since it mainly consists of two structures, an upper tubular body and a lower tubular body, it is possible to obtain an advantage that the length during transportation can be shortened.

  As a specific configuration for varying the heat exchange capacity, at least a part of the lower tubular body, more specifically, a small diameter tube is formed of metal, and the upper tubular body is formed of resin for both the central tube and the outer tube. Can be mentioned.

  In order to further improve the heat exchange capacity of the lower tubular body, it is desirable that at least the gap between the hole and the small diameter tube is filled with a filler having higher thermal conductivity than air. Specific fillers can include sand, cement, or mixtures thereof. In particular, if the material is liquid and solidifies after filling, such as concrete or mortar mixed with sand, cement, and water in an appropriate composition, the unevenness on the inner peripheral surface of the hole is spread without any gaps, and the surrounding earth The heat exchange capacity is further improved by increasing the heat contact area with the ground. In addition, after the filler is solidified, not only can the small-diameter tube and the large-diameter tube be fixed, but the filler can also be expected to engage with the irregularities on the inner peripheral surface of the hole to prevent it from rising.

  Making the small diameter pipe and the large diameter pipe as an integral structure facilitates the embedding work into the ground, enables the filling work of the filling material at the embedding site, and allows the communication part to be easily formed. Is further provided with a partition plate that supports the lower end of the large-diameter tube and the small-diameter tube while penetrating the large-diameter tube and the small-diameter tube, and the partition plate is disposed at a certain distance above the bottom of the hole and formed below the partition plate. It is desirable that the space to be formed forms the communication part. In order to further improve the unity, it is more preferable to provide an intermediate holding frame that holds the small-diameter pipe and the large-diameter pipe penetrating above the partition plate.

  The configuration for reliably filling the filler further includes a filler injection pipe in which a discharge port is disposed in the vicinity of the partition plate, and the filler is discharged from the discharge port to form the hole, the large-diameter pipe, and What is comprised so that the clearance gap between small diameter pipes may be filled from the bottom is suitable.

  If the partition plate supports the lower end portion of the filler injection tube, it is preferable that the members can be integrated.

  Further, the buried heat exchanger according to the present invention is buried in a hole drilled in the ground, and is buried in a pillar shape that is configured to exchange heat with the ground in the process of fluid flowing through the interior. A large-diameter pipe formed at the center, a plurality of small-diameter pipes formed around the large-diameter pipe, and a partition wall that supports the lower-end portions of the large-diameter pipe and the small-diameter pipe while passing through the large-diameter pipe And a heat transfer filler that fills the gap between the small-diameter pipe and the large-diameter pipe above the partition plate, and the filler is provided with a discharge port in the vicinity of the partition plate. It is configured to be introduced from the filler injection pipe and filled into the gap between the hole and the large diameter pipe and the small diameter pipe from below.

  In such a case, since the surface area can be increased without difficulty by the configuration of only a straight pipe, the small diameter pipe and the large diameter pipe are integrated by the partition plate in addition to the effect that the manufacturing is easy and the cost can be reduced accordingly. Since it is a structure, it is easy to embed it into the ground. Furthermore, since the filler is injected from below, it is easy to reliably fill the filler on site, such as preventing air from being mixed, compared to pouring the filler from above.

  In order to increase the heat contact area with the ground and improve the heat exchange capacity more securely, and to fix the hole securely, the filler is liquid at least when filled with cement, and around the hole. It is preferable that a part is soaked and solidified.

  In order to prevent the buried heat exchanger from rising more reliably, a flange that protrudes outward in the radial direction may be provided at an intermediate portion in the length direction.

  If an intermediate holding frame that holds the small-diameter pipe and the large-diameter pipe while being penetrated is provided and the peripheral edge portion of the intermediate holding frame functions as the flange portion, the floating prevention and the structural strengthening are performed in one middle. Since it can carry out with a holding frame, the increase in a number of parts and cost can be controlled. In addition, by strengthening the structure, it can also contribute to preventing damage during embedding and transportation.

  As a more specific method for manufacturing (installing) an embedded heat exchanger, a step of drilling a hole from the ground, a step of arranging a communication portion forming member forming the communication portion at the bottom of the hole, and the hole, Inserting a partition plate and a small-diameter pipe and a large-diameter pipe supported on the partition plate and disposing them on the communication portion forming member; and sand, cement, or their parts in a gap between the hole and the small-diameter pipe and the large-diameter pipe A step of filling a filler as a mixture; a central tube and an outer peripheral tube are inserted into the hole; the central tube is connected to an upper end of the large-diameter tube; and the outer peripheral tube is disposed on an upper surface of the filler Then, there can be mentioned one having a step of communicating the outer peripheral tube with the small-diameter tube.

  In addition, it is possible to facilitate the insertion of a communicating portion forming member, a partition plate, a small diameter tube, a large diameter tube, etc. into the inside of the hole, eliminate the need for the filler injection tube, and further prevent floating up. As a method for installing the vessel, a step of drilling a hole having a larger diameter than the partition plate from the ground into the ground, a step of arranging a communication portion forming member forming the communication portion at the bottom of the hole, An intermediate holding frame that holds the small diameter pipe and the large diameter pipe while penetrating the small diameter pipe and the large diameter pipe is fixed to the upper end portion of the small diameter pipe, and the structure in which the outer peripheral pipe is mounted on the intermediate holding frame is formed as the communication part forming member. And a step of filling the filler, which is sand, cement, or a mixture thereof, at least to the height of the intermediate holding frame from the gap between the inner peripheral surface of the hole and the outer peripheral tube. And the inner peripheral surface of the hole on the filler Those having a filling of sand from the gap between the outer tube, the desirable.

  According to the present invention configured as described above, since it is mainly configured by a plurality of straight pipes, it is possible to simplify manufacturing and reduce costs while maintaining high heat exchange efficiency. In addition, by arranging two tubular bodies having different heat exchange capacities up and down, heat exchange with the ground can be performed more efficiently.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1 and the like, an embedded heat exchanger 1 according to the present embodiment has a columnar shape embedded in a hole H (hereinafter also referred to as an embedded hole H) drilled in the ground. A flow path through which fluid (here, air) to be heat-exchanged flows is formed, and heat is exchanged with the ground in the process of air flowing through the flow path. Such an embedded heat exchanger 1 is suitably used for indoor air conditioning, particularly cooling, for example in factories and homes. The heat exchange capacity of this type of heat exchanger 1 is almost determined by the size (diameter × length), and the length is an important parameter. In FIG. 1, a plurality of heat exchangers are used. In this example, 1 is connected in parallel or in series to increase the total capacity so that it can be used for air conditioning in a large-scale factory FA or the like.

  Next, the single heat exchanger 1 will be described in detail. As shown in FIGS. 1 and 2, the heat exchanger 1 includes a lower tubular body 2 embedded only in the underground constant temperature layer and an upper tubular body embedded in a temperature change layer above the constant temperature layer. And a body 3. The constant temperature layer is a region where the temperature is kept almost constant (change within about 2 to 3 ° C) throughout the day and night, and it is a certain depth region from the ground surface (in Japan, 5m to 10m or more). It is said that the depth exists, but the depth varies depending on the region. The temperature change layer is a region from directly above the constant temperature layer to the ground surface, and the temperature varies under the influence of the ground temperature. Here, the lower tubular body 2 is embedded in a constant temperature layer having almost no temperature difference between the upper end portion and the lower end portion (about 1 ° C. or less).

  The lower tubular body 2 includes, as shown in FIGS. 2 to 5, etc., a large-diameter tube 21 that forms a straight tube at the center and a plurality of straight tubes that are formed around the large-diameter tube 21. (Many) small-diameter pipes 22, partition plates 24 that support the large-diameter tubes 21 and the small-diameter tubes 22 while passing through the lower ends thereof, and the small-diameter tubes 22 and the large-diameter tubes provided above the partition plates 24 And an intermediate holding frame 26 that is fixedly held while penetrating through 21. The length of the intermediate holding frame 26 is about 4 m to 5 m or more.

  The large-diameter pipe 21 is a straight pipe made of a resin having high heat insulation such as vinyl chloride, and the small-diameter pipe 22 is a straight pipe made of a metal having high thermal conductivity such as aluminum or iron. In this embodiment, the cross-sectional area of the large-diameter pipe 21 and the cross-sectional area obtained by adding all the small-diameter pipes 22 are set to be substantially the same.

  The partition plate 24 is a circular plate having a constant thickness that is substantially the same as or slightly smaller than the diameter of the embedding hole H, and the lower end portions of the large diameter tube 21 and the small diameter tube 22 are fixed so as to penetrate the partition plate 24. Is done. In FIG. 4, the large-diameter pipe 21 and the small-diameter pipe 22 are screwed to the partition plate 24, but are not limited to screwing and may be fixed using adhesion or welding. Although the details of the partition plate 24 will be described later, the partition plate 24 is disposed at a certain distance above the bottom of the embedding hole H, and the small-diameter pipe 22 and the large-diameter tube 21 are communicated at the lower end portion below the partition plate 24. A communicating portion 23 is formed.

  Furthermore, in this embodiment, the filler injection tube 5 is attached to the partition plate 24. The filler injection pipe 5 is fixed by adhering the lower end surface thereof to the upper surface of the partition plate 24 and does not penetrate the partition plate 24, and the side peripheral surface of the lower end portion is filled with a filler. A discharge port 5a for discharging the liquid concrete 4 as an agent is opened. The filler injection pipe 5 is set to a length that passes through an intermediate holding frame 26 to be described later and extends to the upper end portion of the upper tubular body 3 or more, and the concrete 4 that is a filler is passed through the upper end opening. When poured, the concrete 4 is discharged from the discharge port 5a at the lower end, and the gap between the burying hole H and the small diameter pipe 22 and the large diameter pipe 21 is filled from below. .

  The intermediate holding frame 26 is made of, for example, a metal having a disk shape with a constant thickness, has one or more air vent holes (not shown) in the thickness direction, and is provided at the upper end portion of the small diameter tube 22. Here, the intermediate holding frame 26 further holds the filler injection pipe 5 so as to penetrate therethrough. A plurality of intermediate holding frames 26 may be provided intermittently in the length direction.

  Thus, in this way, with respect to the lower tubular body 2, the small-diameter pipe 22 is made of a metal pipe, and the space between the small-diameter pipe 22 and the ground is filled with the concrete 4 having better thermal conductivity than air. Thus, the heat exchange efficiency between the ground and the fluid flowing in the small diameter pipe 22 is improved.

  On the other hand, as shown in FIG. 2 and the like, the upper tubular body 3 has a double tube structure including a central tube 31 and an outer peripheral tube 32, and the central tube 31 is continuous with the upper end of the large-diameter tube 21. And the outer peripheral pipe 32 communicates with the small diameter pipe 22. Specifically, the central tube 31 is a straight tube made of a resin having a high heat insulating property such as vinyl chloride, and has substantially the same diameter as the large-diameter tube 21. The outer peripheral pipe 32 has an outer diameter that is substantially the same as the inner diameter of the embedding hole H, and is a straight pipe made of a resin having a high heat insulating property, such as vinyl chloride, like the central pipe 31. The outer peripheral pipe 32 is installed on the concrete 4 that is the filler of the lower tubular body 2, and the upper end of the small diameter pipe 22 opens in a space between the outer peripheral pipe 32 and the central pipe 31. In this way, both the outer peripheral pipe 32 and the central pipe 31 are made of highly heat-insulating resin, so that the heat effect from the ground and heat exchange between the incoming air and the temperature-adjusted outgoing air are achieved. I am trying to be prevented.

  Next, a manufacturing (installation) method for the embedded heat exchanger 1 having such a configuration will be described with reference to FIGS.

  First, as shown in FIG. 5, a buried hole H having an inner diameter substantially the same as the outer diameter of the heat exchanger 1 is drilled vertically or obliquely from the ground to the ground. As shown in the figure, the inner peripheral surface of the embedding hole H is exposed to soil, and is in an uneven state due to the fall of stones or earth and sand.

  Next, the communicating portion forming member 6 made of, for example, concrete for fixing the bottom is fitted into the embedding hole H. The communication portion forming member 6 is a cup-shaped member that opens upward, and the outer diameter thereof substantially matches the inner diameter of the embedding hole H. Further, the inner bottom surface of the communication portion forming member 6 is formed so as to be recessed toward the center, and the water accumulated in the communication portion forming member 6 due to condensation is collected in the central portion. . Although not shown, for example, the accumulated water is periodically discharged using a tube, a pump, or the like inserted into the center tube 31 and the large diameter tube 21 from above.

  On the other hand, in a factory or the like, the lower tubular body 2 is manufactured as an integral structure and transported to the burial site. At the embedding site, before embedding, a structure 27 is manufactured by connecting the central tube 31 to the large-diameter tube 21 of the lower tubular body 2 using a joint or the like. In this embodiment, as shown in the figure, the filler injection tube 5 is also divided into two at the time of transportation, and is connected using a joint or the like before embedding. Then, as shown in FIG. 6, the structure 27 is inserted into the embedding hole H from above, and the outer peripheral edge portion of the partition plate 24 is placed on the upper end surface of the communication portion forming member 6. As a result, the upper opening of the communication portion forming member 6 is closed by the partition plate 24, and the communication portion in which only the small diameter tube 22 and the large diameter tube 21 communicate with each other and a substantially airtight state is maintained. 23 is formed.

  Next, as shown in FIG. 7, liquid concrete 4 as a filler is injected from the upper end opening of the filler injection pipe 5. Then, the liquid concrete 4 is discharged from the lower end discharge port 5 a of the filler injection pipe 5, with the partition wall plate 24 as the bottom, in the gap between the embedding hole H and the small diameter pipe 22 and the large diameter pipe 21. It will be filled from. The liquid concrete 4 is injected until the upper surface thereof is slightly below the upper end of the small diameter tube 22, specifically, the lower end surface of the intermediate holding frame 26. At this time, since the concrete 4 is in a liquid state, the concave and convex inner peripheral surface of the embedding hole H is filled without any gaps, and partly penetrates into the surrounding soil from the inner peripheral surface of the embedding hole H.

  Next, as shown in FIG. 8, after the concrete 4 is solidified to a certain extent, the outer peripheral pipe 32 is inserted into the embedding hole H, and the upper end of the concrete 4 is airtightly fitted to the intermediate holding frame 26. Mounted and arranged slightly in the outer periphery. The reason for the penetration is to prevent water from entering inside from here.

  Finally, the outlet pipe 71 and the inlet pipe 72 communicating with the room such as the factory FA are respectively connected to the upper ends of the center pipe 31 and the outer pipe 32 (see FIG. 2). As a result, a circulation path connecting the room and the heat exchanger 1 is formed. In this circulation path, a blower (not shown) for circulating air as shown by an arrow in FIG. 2 is provided. Further, in addition to the heat exchanger 1, an air conditioner using electric power or the like may be provided in the circulation path.

  In such a configuration, the air sent from the room passes through the outer pipe 32 of the heat exchanger 1 from the introduction pipe 71 and is circulated through the small-diameter pipe 22, and is affected by the heat from the constant temperature layer. It is cooled (or heated) to approach the temperature. The air thus cooled (or heated) is returned to the room from the communication portion 23 through the large-diameter pipe 21, the central pipe 31, and the outlet pipe 72.

  Therefore, according to the present embodiment, the lower tubular body 2 and the upper tubular body 3 having different heat exchange capacities are divided into the upper tubular body having a high heat insulating property in the temperature change layer of the earth affected by the temperature change of the ground surface. While the body 3 is embedded to reduce the thermal influence from the temperature change layer as much as possible, the lower temperature tubular layer having excellent heat exchange capability is provided in the constant temperature layer of the earth that is hardly affected by the temperature change of the ground surface. Since the body 2 is buried to actively transfer heat to and from the constant temperature layer, ideal heat exchange with the ground can be performed and always constant. It becomes possible to supply air at a temperature of.

  Further, the lower tubular body 2 that mainly performs heat exchange is composed of a large number of linear small-diameter pipes 22 and has a reasonably large surface area, so that it is necessary to form a spiral or fin as in the prior art. Therefore, the manufacturing can be simplified and the cost can be reduced accordingly.

  Furthermore, since the liquid concrete 4 is poured into the embedding hole H where the soil is exposed and uneven on the inner peripheral surface as a heat transfer filler, the liquid concrete 4 fills the unevenness without gaps and spreads around the hole H. It becomes. Therefore, the heat contact area with the ground can be increased and the heat exchange efficiency can be further increased, and the floating can be prevented by being securely fixed to the ground.

  In addition, since the small diameter pipe 22 and the large diameter pipe 21 are fixed at the upper end portion and the lower end portion thereof by the intermediate holding frame 26 and the partition plate 24, respectively, and they are an integral structure, Easy transportation.

Next, a second embodiment of the present invention will be described. In this embodiment, members corresponding to those in the first embodiment are denoted by the same reference numerals.
The main differences of the embedded heat exchanger 1 of the present embodiment from the above-described embodiment are that the filler injection pipe 5 does not exist, and the outer peripheral pipe 32 is connected to the intermediate holding frame 26 in an airtight manner before being embedded. And the process when the buried heat exchanger 1 is buried in the soil is different.

  Therefore, in the following, each part of the heat exchanger 1 will be described as necessary while explaining the embedding process.

  In this embodiment, as shown in FIG. 9, an embedding hole H having a diameter larger than that of the first embodiment, that is, a diameter larger than the outer diameter of the heat exchanger 1 is drilled. And the said communication part formation member 6 is inserted in this embedding hole H, and it mounts in the hole bottom center vicinity.

  On the other hand, in a factory or the like, the lower tubular body 2 and the upper tubular body 3 are separately manufactured and transported to the embedding site, and the lower tubular body 2 and the upper tubular body 3 are connected at the embedding site. As a result, the structure 27 ′ having a monolithic structure is manufactured.

  Then, as shown in FIG. 10, the structure 27 ′ is inserted into the embedding hole H from above, and the outer peripheral edge portion of the partition plate 24 is placed on the upper end surface of the communication portion forming member 6.

Next, as shown in FIG. 11, the liquid concrete 4 is injected from the gap between the outer peripheral pipe 32 and the inner peripheral surface of the buried hole H until it is slightly above the joint between the intermediate holding frame 26 and the outer peripheral pipe 32. . This is to prevent water leakage from the outside of the bar to the inside of the pipe by covering the joint with concrete 4.
At this time, since the concrete 4 is in a liquid state, the concave and convex inner peripheral surface of the embedding hole H is filled without any gaps, and partly penetrates into the surrounding soil from the inner peripheral surface of the embedding hole H.

  Then, as shown in FIG. 12, the concrete 4 is solidified, and the gap between the outer peripheral pipe 32 and the inner peripheral surface of the buried hole H is filled with earth and sand.

  Finally, as in the first embodiment, the outlet pipe 71 and the inlet pipe 72 communicating with the room such as the factory FA are respectively connected to the upper ends of the center pipe 31 and the outer pipe 32 (see FIG. 13).

  According to such a configuration, earth and sand are placed above the concrete 4, and the proportion of the concrete 4 is increased to increase the overall weight. Therefore, lifting after construction can be more effectively prevented. Further, since the embedded hole H has a large diameter, an effect that the structure 27 ′ and the communication portion forming member 6 can be easily inserted can be achieved.

The present invention is not limited to the above embodiments.
For example, the upper tubular body may be omitted. In this case, the small-diameter pipe extends and is filled with concrete from the upper end portion to the lower end portion of the embedding hole.

  Rather than pouring concrete into the hole at the site, the concrete is filled in the gap between the small and large diameter pipes at the factory in advance and solidified, and this heat exchanger is completed and fitted into the burial hole. It may be complicated.

  Furthermore, the filler is not limited to concrete, and any filler may be used as long as it has a higher thermal conductivity than air. It is better if there is fluidity at the time of injection, and mortar, cement, sand, etc. may be used.

  The filler injection tube is not necessarily attached to the partition plate, and a separate tube or the like may be used. The tube may be withdrawn after filling with the filler or left as it is. Alternatively, a filler injection hole may be dug separately and connected to the lower end of the embedding hole, and the filler may be injected from the filler injection hole. Further, the filler may be poured from above without using the filler injection tube. In that case, it is necessary to provide a temporary lid so that the filler does not enter from the upper end of the small diameter pipe or the large diameter pipe.

  In addition, a saddle that protrudes outward in the radial direction may be provided at an intermediate portion in the length direction, and earth and sand may be covered thereon. This makes it possible to more reliably prevent lifting. This flange may be formed integrally with the intermediate holding frame.

  In addition, the direction of introducing and deriving air into the heat exchanger may be opposite to that in the above embodiment. It may be used not only for factories but also for household use and other uses, and the heat exchange medium may be a gas other than air or a liquid such as water. If used in winter, the heat exchanger can warm the heat exchange medium and can be used for heating and melting snow.

  In addition, the present invention is not limited to the illustrated examples and embodiments, and various modifications can be made without departing from the gist thereof.

The typical system general | schematic figure which shows the example which embed | buried the heat exchanger in one Embodiment of this invention in the ground, and used for air conditioning. The longitudinal cross-sectional view which shows the state embed | buried under the ground of the heat exchanger in the embodiment. The partial perspective view which shows partially the small diameter tube of the heat exchanger in the same embodiment, a large diameter tube, a partition plate, etc. The disassembled perspective view which shows the attachment structure for attaching the small diameter pipe | tube of the heat exchanger in the embodiment to a partition plate. Installation process explanatory drawing which shows the procedure which installs the heat exchanger in the embodiment. Installation process explanatory drawing which shows the procedure which installs the heat exchanger in the embodiment. Installation process explanatory drawing which shows the procedure which installs the heat exchanger in the embodiment. Installation process explanatory drawing which shows the procedure which installs the heat exchanger in the embodiment. The installation process explanatory drawing which shows the procedure which installs the heat exchanger in 2nd Embodiment of this invention. The installation process explanatory drawing which shows the procedure which installs the heat exchanger in 2nd Embodiment of this invention. The installation process explanatory drawing which shows the procedure which installs the heat exchanger in 2nd Embodiment of this invention. The installation process explanatory drawing which shows the procedure which installs the heat exchanger in 2nd Embodiment of this invention. The installation process explanatory drawing which shows the procedure which installs the heat exchanger in 2nd Embodiment of this invention.

Explanation of symbols

H ... Hole 1 ... Embedded heat exchanger 2 ... Lower tubular body 21 ... Large diameter tube 22 ... Small diameter tube 23 ... Communication part 24 ... Partition plate 26 ... Intermediate holding frame 3 upper tubular body 31 center tube 32 outer tube 4 filler (concrete)
5 ... Filler injection tube 5a ... Discharge port

Claims (14)

A buried heat exchanger having a column shape that is embedded in a hole drilled in the ground and configured to exchange heat with the ground in the process of fluid flowing through the flow path,
In the constant temperature layer in the ground, where the temperature is kept almost constant throughout the season and day and night, almost all of the lower tubular body is embedded, and the temperature changing layer located above the constant temperature layer. An upper tubular body having a lower heat exchange capacity than the lower tubular body,
The lower tubular body includes a large-diameter tube formed at the center, a plurality of small-diameter tubes formed around the large-diameter tube, and a communication portion that communicates the small-diameter tube and the large-diameter tube at the lower end portion. Have
The upper tubular body has a double tube structure composed of a center tube and an outer tube, and the center tube is connected to the upper end of the large-diameter tube, and the outer tube communicates with the small-diameter tube. An embedded heat exchanger.   The embedded heat exchanger according to claim 1, wherein at least a part of the lower tubular body is made of metal, and the upper tubular body is made of resin.   The embedded heat exchanger according to claim 1 or 2, wherein at least a gap between the hole and the small-diameter pipe is filled with a filler having higher thermal conductivity than air.   The embedded heat exchanger according to claim 3, wherein the filler is made of sand, cement, or a mixture thereof.   A partition plate is further provided that supports the lower end portion of the large-diameter pipe and the small-diameter pipe while penetrating the large-diameter pipe and the small-diameter pipe, and the partition plate is disposed at a certain distance above the bottom of the hole and is formed below the partition plate. The embedded heat exchanger according to any one of claims 1 to 4, wherein a space forms the communication portion.   The embedded heat exchanger according to claim 5, wherein an intermediate holding frame is provided above the partition plate to hold the small diameter pipe and the large diameter pipe while penetrating them.   It further includes a filler injection pipe in which a discharge port is disposed in the vicinity of the partition plate, and the filler is discharged from the discharge port and filled from below into the gap between the hole, the small diameter pipe, and the large diameter pipe. The buried heat exchanger according to claim 5 or 6, which is configured to go.   The embedded heat exchanger according to claim 7, wherein the partition plate supports a lower end portion of the filler injection tube. A buried heat exchanger in the form of a column that is buried in a hole drilled in the ground and configured to exchange heat with the ground in the process of fluid flowing inside,
A large-diameter pipe formed in the center, a plurality of small-diameter pipes formed around the large-diameter pipe, a partition plate supporting the lower ends of the large-diameter pipe and the small-diameter pipe while penetrating the large-diameter pipe, and the partition A heat transfer filler that fills a gap between the hole and the small-diameter pipe and the large-diameter pipe above the plate,
An embedded heat exchanger configured such that the filler is introduced from a filler injection pipe having a discharge port provided in the vicinity of the partition plate and is filled into the gap from below.   The embedded heat exchanger according to claim 8, wherein the filler contains a cement and is in a liquid state at least at the time of filling, and a part of the filler soaks around the hole and is solidified.   The embedded heat exchanger according to any one of claims 1 to 9, wherein a flange portion protruding outward in the radial direction is provided at an intermediate portion in the length direction.   The intermediate holding frame that holds the small-diameter pipe and the large-diameter pipe while passing therethrough is provided above the partition plate, and the peripheral edge portion of the intermediate holding frame functions as the flange portion. Buried heat exchanger. A method for manufacturing an embedded heat exchanger according to claim 5 or 9,
Drilling holes from the ground;
Arranging a communication part forming member for forming the communication part at the bottom of the hole;
Inserting a partition plate and a small-diameter pipe and a large-diameter pipe supported by the hole into the hole and disposing on the communication portion forming member;
Filling a gap between the hole and the small diameter pipe and the large diameter pipe with a filler which is sand, cement or a mixture thereof;
A center tube and an outer tube are inserted into the hole, the center tube is connected to an upper end of the large-diameter tube, and the outer tube is disposed on an upper surface of the filling, and the outer tube, the small-diameter tube, And a method for producing an embedded heat exchanger. A method for producing an embedded heat exchanger according to claim 5,
Drilling a hole of a predetermined size larger diameter than the partition plate from the ground;
Arranging a communication part forming member for forming the communication part in the hole bottom;
An intermediate holding frame that holds the small-diameter pipe and the large-diameter pipe while being penetrated is fixed to an upper end portion of the small-diameter pipe, and a structure in which the outer peripheral pipe is attached on the intermediate holding frame is provided with the communication portion. Placing on the forming member;
Filling the filler, which is sand, cement, or a mixture thereof, at least to the height of the intermediate holding frame from the gap between the inner peripheral surface of the hole and the outer peripheral pipe;
And a step of filling earth and sand from the gap between the inner peripheral surface of the hole and the outer peripheral tube on the filler.