JP5100219B2 - Underground equipment in groundwater thermal ground equipment. - Google Patents

Description

  The present invention relates to an underground device in groundwater heat ground equipment, and more particularly, to supply groundwater heat to ground equipment such as a cooling / heating facility and a snowmelt facility using groundwater heat as a heat source by a circulating closed circuit type. The present invention relates to an underground device constructed to reach a predetermined depth in the existing underground.

In order to effectively use underground heat (geothermal heat) as a heat source for ground facilities for air conditioning and snow melting, etc., an underground device built in one well (drilling hole) drilled deep underground is known. (See, for example, Patent Document 1).
The underground device (ground heat exchange system) disclosed in Patent Document 1 is adapted to the depth of the well by sequentially connecting a plurality of heat collecting pipe units according to the depth of one well. This is how it is built.

The heat collecting pipe unit is configured by attaching an even number of pipes between upper and lower annular flanges.
The pipe end is attached to the annular flange by projecting the pipe end from the annular flange on one side of the upper and lower annular flanges and positioning the pipe end inside the annular flange on the other side. ing. Bolt insertion holes are provided in the upper and lower annular flanges.
This enables the underground equipment to be constructed in accordance with the depth of the well by sequentially connecting the heat collecting pipe units while connecting the upper and lower annular flanges of each heat collecting pipe unit with bolts and nuts. ing.
JP 2004-278866 A (see paragraph numbers 0014 to 0016 and FIGS. 1 to 4)

By the way, in the above-described conventional apparatus, when the heat collecting tube units are sequentially connected in accordance with the depth of the well, the pipe end portion of each pipe projecting outside from the annular flange on one side is connected to the annular side on the other side. The pipes are connected so as to be directly connected to the pipe ends of the pipes located inside the flange. That is, each pipe of each heat collecting pipe unit is formed so as to be connected linearly independently from the upper end opening of the well facing the ground surface toward the bottom of a predetermined depth.
Therefore, in the heat collecting pipe unit arranged on the bottom side of the well, as shown in FIG. 2 and FIG. 7 of Patent Document 1, the circumferential direction which is opposed using a folded pipe pipe such as a U-shaped pipe is used. In order to form a circulation path consisting of an outward path from the surface of the well facing the top opening to the bottom of a predetermined depth and a return path from the bottom to the surface by connecting the ends of each pipe, etc. However, there was a problem in workability when the heat collecting pipe unit was installed in the well and installed.

  In addition, in the conventional apparatus, after each heat collecting tube unit is connected in order and installed in the well, a grout having a low thermal conductivity is poured into the outside and inside of the heat collecting tube unit, so that the efficiency with the underground heat is reduced. There were problems such as inability to perform good heat exchange.

  Therefore, the present invention was devised to solve the above-described problems, and a heat exchanger can be incorporated and installed in a casing inserted into the ground so as to reach a water vein with good workability. In addition, groundwater heat has been improved so that heat loss in the range of the influence of outside air from the ground surface can be suppressed, and groundwater heat can be practically collected by enabling efficient heat exchange with groundwater heat. The purpose is to provide an underground device in the above-ground facilities.

In order to solve the above-described problems, in the present invention, a casing inserted so as to reach a water vein existing at a predetermined depth in the ground, and heat exchange between the casing and the groundwater heat inserted in the casing are performed. A heat exchanger, and the heat exchanger has a forward path for circulating a heat medium from the ground surface facing the upper end opening of the casing toward the predetermined depth, and the heat that has been distributed through the forward path. A ground path device for supplying the heat medium to a ground facility using the groundwater heat as a heat source by a closed circulation circuit type, comprising a return path for circulating the medium toward the ground surface,
The heat exchanger is sequentially connected to the casing in the cylindrical direction at least in the first unit disposed on the bottom side of the casing and in a range from the first unit toward the ground surface. A plurality of second units,
The first unit is formed in a substantially ring shape in a plan view with an outer diameter corresponding to the inner diameter of the casing, and upper and lower return side tanks having a heat medium merging chamber, and the upper and lower return side sides A return-side long thin tube that is attached so that pipe ends communicate with the merge chamber at a plurality of locations in the circumferential direction between the tanks, and an outer diameter that is substantially the same in plan view as the upper and lower return-side tanks A connecting flange that is formed in a substantially ring shape and that is disposed in the cylindrical direction of the casing at an appropriate interval from the upper return-side tank, and in the circumferential direction of the connecting flange, the second flange The pipe ends are attached so as to be connected to each other by connecting to the unit, and pass through the upper return side tank and communicate with the lower return side tank. Forward path long tube mounted so as to, and is configured to include a a return path short tube mounted so as to communicate the tube end into the return side tank of the upper,
The second unit is formed in a substantially ring shape having an outer diameter that is substantially the same in plan view as the upper and lower return side tanks, the return side long tubule, and the upper and lower return side tanks, The upper and lower connection flanges arranged on the coaxial core line at appropriate intervals from the upper and lower return-side tanks, and the upper and lower connection flanges, the connection between the connection flanges and the connection flange of the first unit The forward-side long tubes that are respectively attached so that the tube ends are connected to each other by the connection, and the upper and lower return-side short tubes, and the second unit The forward-side long pipe passes through the upper and lower return-side tanks, and pipe ends are connected to the upper and lower connection flanges. The upper and lower return-side short pipes are pipe end portions in the upper and lower return-side tanks. Each communicating It is attached so as to make it.
And in this invention, the said heat exchanger is provided with the 1 thru | or several 3rd unit connected and arrange | positioned in the cylinder direction of the said casing in the range from the above-mentioned 2nd unit to the ground surface. This is preferable. In the third unit, the pipe end portions are coaxially connected between the upper and lower connection flanges and the upper and lower connection flanges by connecting the connection flanges to each other and the connection flange of the second unit. A forward-side elongate tube and a return-side elongate tube that are respectively attached, and of the third unit, the third unit is connected to face the ground surface from the upper end opening of the casing. The third unit of the uppermost stage arranged in this manner also serves as a suspension that is placed on a fixed flange provided outward from the opening edge of the upper end opening of the casing and is bolted. And a tube end side of each of the forward-side long tube and the return-side long tube is projected from the sealed lid.

According to such a configuration, when the heat exchanger is inserted into the casing inserted in the ground so as to reach the underground depth where the groundwater water veins exist, the bottom side of the casing is provided. A plurality of second units are inserted into the casing following the first unit while sequentially connecting the second units following the first unit arranged in accordance with the insertion depth of the casing. Thereby, the heat exchanger provided with both the forward path and the return path of the heat medium can be installed in the cylinder direction in the casing.
And the 3rd unit provided with the sealing lid for closing the upper-end opening of the casing which faces the earth surface in the shape of a seal is connected to the 2nd unit, and the cylinder direction toward the upper-end opening side of the casing By disposing, the heat exchanger installed in a cylindrical tube shape can be suspended and supported by the sealing lid that seals the upper end opening of the casing toward the bottom side of the casing.
Further, in the range of the influence depth of the outside air from the ground surface to the ground, the third unit including one forward-side long tube and one backward-side long tube is used. In particular, the heat medium is sent to the ground facility through one return-side long tube. In other words, in the structure in which the second unit having a large number of return-side long tubules is installed in the range of the outside air influence depth, heat is radiated from a wide area formed by each return-side long tubule. Although the loss is large, the return path through which the heat medium exchanged with the groundwater heat is sent to the ground facility by installing the third unit is a single long pipe on the return path side. is there. Thereby, the heat loss by heat dissipation can be suppressed.

  Further, in the present invention, the submersible pump is suspended and arranged at an appropriate depth position in the casing through an inner passage formed in the cylindrical direction in the casing along the axial center of the heat exchanger. Features.

According to such a configuration, convection for causing groundwater in the casing to flow in the cylindrical direction (vertical direction) can be forcibly caused by the submersible pump suspended in the casing. Accordingly, the groundwater whose water temperature has been lowered by heat exchange with the heat exchanger does not stagnate in the casing, and the water vein is forcibly replaced with the groundwater.
At this time, the groundwater pumped up by the submersible pump is returned (reduced) to, for example, a water vein (such as a water vein dome) facing the bottom of the casing, but a part of the groundwater is not returned. Can be used directly as a heat source for ground facilities. It can also be used as drinking water in natural disasters.

According to the underground apparatus in the ground facility using the underground heat according to the present invention, the first unit arranged on the bottom side of the casing inserted so as to reach a predetermined depth in the ground, the first unit to the ground A plurality of second units connected and arranged in a range extending to the front side, and a third unit connected and arranged in a range extending from the second unit to the upper end opening of the casing facing the ground surface, these The heat exchanger having a forward path from the ground surface where the upper end opening of the casing faces to the bottom side of the underground depth and a return path from the bottom side to the ground surface by assembling only by sequentially connecting the units of the casing. It can be installed inside. That is, it is possible to construct an underground device that reaches the underground depth where the groundwater veins exist.
As a result, the workability for constructing the underground equipment to reach a predetermined depth in the ground where the water veins exist is improved, so that it is possible to expect a reduction in construction costs and a shortening of the construction period. .

In addition, the return path in the range in which heat exchange between the heat medium that has flowed into the bottom of the casing and the groundwater heat through the forward path is made up of a large number of thin tubes, which The exchange area is increased.
Thereby, since efficient heat exchange with groundwater heat is performed, the heat-collecting effect of groundwater heat can be improved.

In addition, the groundwater in the casing is convected by a submersible pump so that the groundwater between the inside and outside of the casing is forcibly replaced, so that the heat exchanger heats the groundwater at the same temperature as the water temperature of the water vein. Exchange is performed. In other words, groundwater whose water temperature has been lowered by heat exchange with the heat exchanger does not stagnate around the heat exchanger, and groundwater with high water temperature from the water vein flows into the heat exchanger, Heat exchange takes place.
As a result, in addition to efficient heat exchange due to the heat exchange area described above, it is possible to expect efficient heat exchange by contact with groundwater with a high water temperature. It can be further improved and groundwater heat can be efficiently sent to the ground facilities.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a longitudinal sectional view showing a state in which an underground apparatus according to an embodiment of the present invention is built in a well.

≪Configuration of underground equipment≫
As shown in FIG. 1, the underground apparatus A includes a casing 1 inserted so as to reach a water vein existing at a predetermined depth in the ground, and a bottom side from an upper end opening facing the ground surface GL of the casing 1. The heat exchanger 2 is installed and installed so as to be inserted and directed.
And the underground apparatus A connects the heat exchanger 2 to the ground equipment B by the closed circulation circuit type in the pipeline 22, so that the heat medium is heated to substantially the same level as the groundwater heat by heat exchange with the groundwater heat. Is transferred to the ground facility B, and the heat medium deprived of heat by the ground facility B is repeatedly heated by heat exchange with the groundwater heat.
Incidentally, examples of the ground equipment B include an air conditioning system and a snow melting system. In the present embodiment, as shown in FIG. 1, a snow melting facility is taken as an example.

≪Case configuration≫
The casing 1 is formed in a cylindrical shape having an appropriate diameter and length by a metal material having excellent corrosion resistance and high thermal conductivity, and a plurality of the casings 1 are sequentially connected so as to reach a water vein (water vein dome) M. It is designed to be inserted into the ground.
And the casing 1 is provided with the inflow part 3 of the groundwater N in the cylinder wall. The inflow portion 3 is formed by a large number of slits provided so as to extend in the cylindrical direction at appropriate intervals in the circumferential direction of the casing 1.
Moreover, as shown in FIG. 1, the ring-shaped fixing flange 4 is provided in the opening outer periphery of the upper end opening part 1a which faces the ground surface GL of the casing 1 toward outward. The fixing flange 4 is fixed with bolts and nuts (not shown) in a state where the sealing lid 16 of the third unit 2-3 described later of the heat exchanger 2 is coaxially mounted. I have to.

≪Configuration of heat exchanger≫
FIG. 2 is a perspective view showing the heat exchanger according to the present embodiment. Here, description will be made with reference to FIG. 1 as appropriate.
The heat exchanger 2 has a high thermal conductivity, excellent corrosion resistance, and is connected to each unit group formed of a metal material such as a stainless steel material having an appropriate rigidity on the same axis. It is configured to be incorporated in the casing 1 so as to extend from the opening 1a to the bottom side reaching a predetermined depth in the ground.

As shown in FIG. 1, the heat exchanger 2 is connected to the bottom side of the casing 1 and arranged in the cylindrical direction, and the first unit 2-1 to the casing 1. A plurality of second units 2-2 connected in accordance with the length (depth of the well) and arranged in the cylinder direction, and an upper end opening 1a of the casing 1 facing the ground surface GL from the second unit 2-2 And a third unit 2-3 arranged in the cylinder direction so as to be connected to each other.
Incidentally, the 1st, 2nd units 2-1, 2-2, and 3rd unit 2-3 are formed in the length which can be carried on a loading platform, such as a truck. For example, it is formed in a length of about 3 m to 5 m.

<< Configuration of the first unit >>
FIG. 4 is a perspective view and a sectional view showing the first unit. Here, the first unit 2-1 will be described with reference to FIGS. 1 and 2 as appropriate, as shown in FIG. 4, the upper and lower return side tank 5,6, return side tank of the vertical 5,6 A large number of return-side long narrow tubes 7 that are attached to each other, a connection flange 8 that is disposed on the same axis on the outer side in the axial direction at an appropriate interval from the upper return-side tank 5, and from this connection flange 8 A return-side long tube 9 that passes through the upper return-side tank 5 and extends over the lower return-side tank 6, and a return-side short length that is attached between the connection flange 8 and the upper return-side merge tank 5. A tube 10 is provided.

  As shown in FIGS. 1 and 3, the upper and lower return-side tanks 5, 6 are substantially ring-shaped in a plan view having an outer diameter corresponding to the inner diameter of the casing 1 and an appropriate inner diameter, and the casing 1. It is formed in a cylindrical shape having an appropriate height (length) in the cylinder direction. As a result, heat medium merging chambers 11 and 12 are provided in the upper and lower return-side tanks 5 and 6, respectively.

The return-side long narrow tube 7 is a heat exchange flow path for exchanging heat between the heat medium flowing through the tube and the groundwater heat by contact with the groundwater N. That is, it is a heat exchange channel for expanding the contact area with the groundwater N by a large number of return-side long tubules 1c and efficiently exchanging heat with the groundwater.
The return-side long thin tube 7 has a length extending over the upper and lower return-side tanks 5 and 6 and has an appropriate thickness (outer diameter).

  Then, as shown in FIGS. 4 (a) and 4 (b), the return-side long tubules 7 are formed on the upper and lower return-side tanks 5 and 6 except for a part in the circumferential direction to which the forward-passage long tubes 9 are attached. The pipe ends are attached in a zigzag manner in the circumferential direction of the opposing ring surfaces so as to communicate with the merge chamber 11. This attachment is performed by fixing such as screwing or welding.

  The connection flange 8 is formed in a substantially ring shape in plan view having an outer diameter and an inner diameter that are the same as the outer diameter and inner diameter of the upper and lower return-side tanks 5 and 6, and bolt connection holes at several circumferential positions. 13 is provided.

The forward long side pipe 9 is a post-second unit 2-2 for a heat medium whose heat has been removed due to heat exchange with the ground equipment B, for example, heat exchange with the snow melting pipe of the snow melting equipment. The return path for returning to the lower return path side tank 6 by the linear communication extending in the cylinder direction of the forward path side long pipe 9a and the forward path side long pipes 9b and 9c described later of the third unit 2-3. It is a flow path.
The forward-side long tube 9 is formed to have a thickness of about 4 to 5 times the thickness (outer diameter) of the backward-side long tube 7. That is, the thickness through which the heat medium is circulated at a flow rate at which the heat medium can be distributed at a uniform flow rate to each of the long return tubes 7 through the merge chambers 11 and 12 of the upper and lower return side tanks 5 and 6. Is formed.

As shown in FIG. 3 and FIG. 4 (a), the forward-side long tube 9 is formed to have a length extending from the connection flange 8 to the lower return-side tank 6, and is connected to one end of the tube end. parts is attached to the opening shape of the connection flange 8, it is passed through the return side tank 5 of the upper, so as to communicate the tube end of the other end at the confluence chamber 12 of the lower return side tank 6, the return path It is attached to the tank 6.
Thus, merging chamber 12 of the return side tank 6 of the lower side outward side long pipe 9 is connected, as shown in FIG. 2, the forward-side elongated tube 9a described later of the second unit 2 -2 and third unit 2-3 described later to forward path long tube 9b, a heat medium coming back from the ground equipment B and circulated 9c, the first unit 2 each return path length of the -1 long tubule 7, Then, the return side long narrow tube 7 described later of the second unit 2-2 and the return side long tubes 15 and 15a described later of the third unit 2-3 are circulated and sent back to the ground facility B. It becomes a folding room.

Return path short tube 10, merging chamber of the lower return side tank 6 of the first unit 2 -1 is returned to (folded chamber) 12, the number each return path long thin tube 7 of the present in the merging chamber 11 the heat medium to be merged are distributed inflow at the upper side of the return side tank 5 of the merging chamber 11, inflow conduit for flowing to the lower side of the backward side tank 6 to be described later of the second unit 2 -2 It is.
The return-side short tube 10 has the same thickness (tube diameter) as the forward-side long tube 9 and has a length extending from the connection flange 8 to the upper return-side tank 5. As shown in FIGS. 3 and 4, the return-side short pipe 10 is attached to the connection flange 8 so that the pipe end on one end side is opened, and the pipe end on the other end side of the upper return-side tank 5. The return tank 5 is attached so as to communicate with the junction chamber 11.

<< Configuration of the second unit >>
FIG. 5 is a perspective view showing the second unit. Here, description will be made with reference to FIG. 3 as appropriate. Further, the same components as those of the first unit 2-1 described above are denoted by the same reference numerals, and details thereof are omitted.
The second unit 2 -2, as shown in FIG. 5, the upper and lower return side tank 5,6, a number is attached book return path long tubule 7 over between the upper and lower return side tank 5,6 The upper and lower connecting flanges 8 and 8 disposed on the coaxial line on the outer side in the axial direction with an appropriate distance from the upper and lower return side tanks 5 and 6 and the upper and lower return side tanks 5 and 6 respectively pass through Forward-side elongate pipe 9a attached so as to extend between the connecting flanges 8 and 8, and upper and lower return-side elongate pipes attached between the upper and lower return-side tanks 5 and 6 and the upper and lower connecting flanges 8 and 8, respectively. The pipes 10 and 10 are provided.

The outbound long tube 9a is formed to have the same thickness (outer diameter) as the outbound long tube 9 of the first unit 2-1.
The return-side long tube 9a is formed to have a length extending between the upper and lower connection flanges 8 and 8, and as shown in FIGS. 3 and 5, the tube end side of one end is connected to the upper connection flange 8a. The lower return-side tank 6 is passed through from the upper return-side tank 5 and the other pipe end is attached to the lower connection flange 8 in an opening shape.

<< Configuration of the third unit >>
FIG. 6 is a perspective view showing a third unit according to the present embodiment. Here, the same components as those of the first and second units 2-1 and 2-2 described above are denoted by the same reference numerals, and details thereof are omitted.
The third unit 2-3 has two types, that is, the structure shown in FIG. 6A and the structure shown in FIG. 6B.
The 3rd unit 2-30 shown to (a) is formed in the length of about 4 m similarly to the 1st unit 2-1 and the 2nd unit 2-2. On the other hand, the third unit 2-31 shown in (b) has a length of about 1 m.

First, the third unit 2-30 shown in (a) includes upper and lower connection flanges 8 and 8, an intermediate ring body 14 provided between the upper and lower connection flanges 8 and 8, and an upper and lower connection flange 8. , 8 are provided with an outward long tube 9b and a return long tube 15.
Since the intermediate ring body 14 has basically the same configuration as the connection flange 8 except for the bolt insertion hole 13, description thereof is omitted.

The outgoing long tube 9b and the return long tube 15 have the same thickness (outer diameter) as the outgoing long tube 9 of the first unit 2-1, and are located between the upper and lower connecting flanges 8 and 8. Each is formed to a length.
As shown in FIG. 6A, the forward side long tube 9b and the return side long tube 15 are attached to the upper connection flange 8 in an opening shape, as shown in FIG. Each of the ring bodies 14 is penetrated, and the pipe end portion on the other end side is attached to the lower connection flange 8 in an opening shape.

  On the other hand, the third unit 2-31 shown in (b) is placed coaxially on the lower connection flange 8 and the fixed flange 4 provided on the outer peripheral edge of the upper end opening of the casing 1. The sealing lid 16 fixed in this manner, the pump support 17 provided coaxially on the sealing lid 16, and the forward path side long attached between the connection flange 8 and the sealing lid 16. A tube 9c and a return-side long tube 15a are provided.

The sealing lid 16 is attached so as to seal the upper end opening 1 a of the casing 1 in a sealed manner, and is formed in a size corresponding to the outer diameter of the fixed flange 4 of the casing 1. Then, the sealing lid 16, as shown in (b) of FIG. 6, the bolt insertion holes 18 are provided.

  The pump support part 17 suspends the submersible pump 20 that is inserted and disposed at an appropriate depth position in the casing 1 through the inner passage 19 of the heat exchanger 2 via a suspension member 21 as shown in FIG. It is formed so as to support it. The pump support 17 is coaxially provided on the sealing lid 16 by welding or the like.

The inner passage 19 is provided inside the upper and lower return flanges 5 and 6 of the first and second units 2-1 and 2-2, inside the upper and lower connection flanges 8 and 8, and third. The upper and lower connecting flanges 8, 8 of the unit 2-30 , the intermediate ring body 14, and the inner side of the lower connecting flange 8 of the third unit 2-31 are formed over the cylindrical direction of the heat exchanger 2. It is what is done.

The outgoing long tube 9c and the return long tube 15a have the same thickness (outer diameter) as the outgoing long tube 9 of the first unit 2-1, and the connection flange 8 and the sealing lid 16 Each is formed to a length of about between.
As shown in FIG. 6 (b), the forward side long tube 9c and the return side long tube 15a are attached to the connection flange 8 in the form of openings on the other end side, as shown in FIG. These tube ends are attached so as to protrude from the sealing lid 16.
As a result, the pipe ends of the forward-side elongate pipe 9c and the return-side elongate pipe 15a projecting from the hermetic lid 16 are connected to the ground facility B as shown in FIG. The connection ports 23 and 24 for the forward path and the return path are respectively connected to the pipeline 22 for feeding in.

[Explanation of underground equipment]
Next, an example of underground installation of the underground apparatus A according to the present embodiment configured as described above will be briefly described. Here, description will be made with reference to FIGS.
As shown in FIG. 1, the casing 1 is inserted (planted) into the ground to reach a water vein (water vein dome) M. Then, in accordance with the inserted depth of the casing 1, the first unit 2-1 while a plurality of second unit 2 2 which is connected subsequent to the first unit 2-1 sequentially connected casing 1 Let go through to the bottom side.
At this time, the second unit 2-2 is attached to the first unit 2-1, while the units 2-1 and 2-2 are suspended by a crane so as to be positioned on the coaxial line with respect to the casing 1. Then, as shown in FIGS. 2 and 3, the second units 2-2 are connected with the bolts and nuts 26 with the packing members 25 interposed between the connecting flanges 8.
Then, when the first unit 2-1 is inserted from the bottom of the casing 1 having the inflow portion 3 formed of the slit group to about 5 to 6 m, the second unit 2-2 is illustrated with respect to the second unit 2-2. After connecting the third unit 2-30 shown in 6 (a) and inserting it into the casing 1, and finally connecting the third unit 2-31 shown in 6 (b), The sealing lid 16 is placed on the fixed flange 4 and fastened with bolts and nuts so that the upper end opening 1 a of the casing 1 is sealed with the sealing lid 16.
Thereby, from the upper end opening 1a of the casing 1 exposed to the ground surface GL toward the bottom side reaching a predetermined depth in the ground where the water vein M exists, both the forward path and the return path of the heat medium are provided, and A cylindrical heat exchanger 2 having an inner passage 19 formed over the entire length along the inner shaft core can be suspended.

Then, after such a construction procedure, the heat exchanger 2 is suspended and installed in the casing 1, and then the inside of the casing 1 is passed through the inner passage 19 formed along the inner axis of the heat exchanger 2. By performing the work of suspending and placing the submersible pump 20 at an appropriate depth position, the underground apparatus A can be constructed to reach a predetermined depth in the ground existing in the water vein M.
In the illustrated example shown in FIG. 1, the submersible pump 20 is shown suspended from the bottom side of the casing 1, but is introduced into the casing 1 from the inflow portion 3 by water pressure (ground pressure). What is necessary is just in the casing 1 in the range which is not exposed to the upper space 27 side from the water surface WL of the underground water N which is.

According to the underground apparatus A according to the present embodiment configured as described above, as shown in FIGS. 1 to 3, the underground apparatus A is inserted into the well so as to reach the underground depth where the water vein M exists. When the heat exchanger 2 is installed in the casing 1, the second unit 2-2 is sequentially placed in accordance with the insertion depth of the casing 1 in the first unit 2-1 disposed on the bottom side of the casing 1. The second unit 2-2 is inserted into the casing 1 following the first unit 2-1, and finally the third unit 2-3 is connected to the second unit 2-2. The heat exchanger 2 provided with both the forward path and the return path of the heat medium can be installed in a state of being suspended and supported in the casing 1 by being inserted into the casing 1 while being sequentially connected. .
Thereby, the workability for constructing the underground apparatus 2 so as to reach a predetermined depth in the ground where the water vein M exists is improved. That is, it is not necessary to use a U-shaped pipe for folding back as in the conventional device.

As shown in FIG. 1 and FIG. 2 , in the range of the outside air influence depth L from the ground surface GL to the ground, the outward long tubes 9b and 9c and the return long tubes 15 and 15a are provided. The third unit 2-3 is used . In particular, since the heat medium is sent to the ground facility B through the inside of the single return-side long tubes 15 and 15a, the heat radiation amount of the heat medium can be suppressed. That is, in the structure in which the second unit 2-2 having a large number of the return-side long tubules 7 is provided in the range of the outside air influence depth L, heat is radiated from a wide area including the return-side long tubules 7. Although the heat loss is large, the return path through which the heat medium exchanged with the groundwater heat is sent to the ground equipment B by installing the third unit 2-3 is as shown in FIG. 2, it is constituted by a single return path long tube 15, 15a. Thereby, the heat loss of the heat medium by external temperature can be suppressed.

The specific configuration of the embodiment of the present invention is not limited to the above-described embodiment, and there are design changes and the like without departing from the gist of the present invention described in claims 1 to 3. Are also included in the present invention.
For example, as shown in FIG. 1, there exists between the water surface WL of the groundwater N flowing into the casing 1 and the upper end opening 1 a of the casing 1 closed by the sealing lid body 16. A venting device for venting residual air (entrained air) to a vacuum state can be provided.
Thereby, the heat insulation effect can be given to the upper space 27 by controlling and maintaining the upper space 27 in, for example, an evacuated reduced pressure state or a vacuum state in a range of −300 mmHg to −600 mmHg. That is, in the outside air influence depth L of about 4 m to 6 m from the ground surface GL which is supposed to be affected by the outside air temperature, in an evacuated decompression state where there is no air layer which is easily released by heat transfer or in a vacuum state The heat insulation effect for suppressing the heat loss which causes the temperature fall in the casing 1 can be expected.

It is a longitudinal cross-sectional view which shows the state which constructed | assembled the underground apparatus which concerns on embodiment of this invention in the well. It is a perspective view which shows the heat exchanger which concerns on this embodiment. It is a longitudinal cross-sectional view which expands and shows a part of the heat exchanger. The 1st unit which comprises the same heat exchanger is shown, (a) is a perspective view, (b) is a bb line cross-sectional view of (a), (c) is (a FIG. It is a perspective view which shows the 2nd unit which comprises the same heat exchanger. The 3rd unit which comprises the same heat exchanger is shown, (a) is a perspective view which shows the 3rd unit connected following a 2nd unit, (b) is an upper-end opening part of a casing It is a perspective view which shows the whole 3rd unit connected to the uppermost stage so that it may face the earth surface.

Explanation of symbols

A underground equipment 1 casing 1a upper opening 2 heat exchanger 2-1 first unit 2-2 second unit 2-3 third unit 4 fixed flange 5, 6 return side tank 7 return side long narrow tube 8 Connection flange 9, 9a, 9c Outward side long pipe 10 Return side short pipe 11, 12 Junction chamber M Water vein N Groundwater L Depth of air influence B Ground equipment

Claims (3)

A casing inserted to reach a water vein existing at a predetermined depth in the ground,
A heat exchanger that is inserted into the casing and exchanges heat with groundwater, and
The heat exchanger has a forward path for circulating the heat medium from the ground surface where the upper end opening of the casing faces to the predetermined depth, and the heat medium that has been circulated through the forward path is directed from the depth of the ground to the ground surface. An underground device for supplying the heat medium to a ground facility using the groundwater heat as a heat source by means of a closed circulation circuit.
The heat exchanger is connected at least on the bottom side of the casing and is arranged in the cylindrical direction; and
A plurality of second units that are sequentially connected in the casing and arranged in the cylindrical direction in a range from the first unit toward the surface side facing the upper end opening of the casing,
The first unit is formed in a substantially ring shape in a plan view with an outer diameter corresponding to the inner diameter of the casing, and upper and lower return side tanks having a merging chamber for the heat medium;
A return-side long thin tube attached so that pipe ends communicate with the merge chamber at a plurality of locations in the circumferential direction between the upper and lower return-side tanks;
A connection flange that is formed in a substantially ring shape having an outer diameter that is substantially the same diameter in plan view as the upper and lower return-side tanks, and is disposed on a coaxial core line at an appropriate interval from the upper return-side tank;
At the important points in the circumferential direction of the connection flange, the pipe ends are respectively connected to each other by connection with the second unit, and pass through the merge chamber of the upper return side tank. A forward-side elongate pipe attached to communicate the pipe end with the confluence chamber of the lower return-side tank and a return path attached to connect the pipe end to the confluence chamber of the upper return-side tank. A side short tube, and
The second unit is formed in a substantially ring shape in plan view with an outer diameter corresponding to the inner diameter of the casing, and upper and lower return side tanks having a merging chamber for the heat medium ;
A return-side long thin tube attached so that pipe ends communicate with the merge chamber at a plurality of locations in the circumferential direction between the upper and lower return-side tanks ;
Is formed in a substantially ring shape having an outer diameter substantially the same diameter in the return path side tank in a plan view of the upper and lower, upper and lower connections which are arranged coaxially at appropriate intervals from each return side tank of said upper and lower A flange,
This upper and lower connecting flange, the connecting flange between the connection and the first of the connecting flange and the connecting respectively mounted that the forward path side elongated tube and the upper and lower condensate as between the pipe ends are connected by the unit A roadside short tube, and
In addition, the outgoing side long tube of the second unit passes through the merge chamber of the upper and lower return side tanks, and pipe end portions are respectively attached to the upper and lower connecting flanges. A pipe is attached so that pipe ends communicate with the merge chambers of the upper and lower return-side tanks. Said heat exchanger comprises a third unit of the number of multiple of the Ru is arranged connected to the cylinder direction of the casing in a range extending from the second unit to the ground facing the top opening of said casing,
The third unit has upper and lower connecting flanges formed in a substantially ring shape in plan view with an outer diameter corresponding to the inner diameter of the casing ;
Between the upper and lower connection flanges, the forward-side long pipe and the backward-side long pipe that are respectively attached so as to be connected to the pipe ends by connecting the connection flanges and the connection flange of the second unit. A tube, and comprising
In addition, among the third units, the uppermost third unit that is connected and disposed so as to face the ground surface from the upper end opening of the casing has a plan view with an outer diameter corresponding to the inner diameter of the casing. A lower connection flange formed in a substantially ring shape,
A hermetically sealed lid that also serves as a suspension that is bolted and placed on a fixed flange provided outward from the opening edge of the upper end opening of the casing ;
A forward-side long tube and a return-side long tube, which are respectively attached so as to project the respective tube end portions from the sealing lid, between the sealed lid and the lower connection flange, The underground apparatus in the groundwater heat utilization ground facility according to claim 1, wherein the underground apparatus is configured as described above.   The submersible pump is suspended and disposed at an appropriate depth position in the casing through an inner passage formed in a cylindrical direction in the casing along the axial center of the heat exchanger. Or the underground apparatus in the groundwater utilization ground equipment of Claim 2.

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