JP2013134036A - Air conditioning device using geo-heat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability by basically disposing a protecting means that reduces a bending moment of a branch pipe section with respect to a vertical pipe section.SOLUTION: An air conditioning device 1 using geo-heat heat exchanges heat of external air A with geo-heat heat and supplies the air to the inside of a building. The air conditioning device 1 includes a pipe-like geo-heat heat exchanging part 1A, which is buried in the ground and exchanging heat of external air A with geo-heat heat. The geo-heat heat exchanging part 1A includes branch pipe sections 22A to 22D having vertical pipe sections 25A to 25D that vertically extend and branch pipe sections 26A to 26D that are branched from the vertical pipe sections 25A to 25D and laterally protruding, respectively. The branch section 22 is provided with a protecting means 27 for reducing a bending moment of the branch pipe sections 26A to 26D with respect to the vertical pipe sections 25A to 25D, respectively.

Description

  TECHNICAL FIELD The present invention relates to an air conditioner using geothermal heat, and more particularly to an air conditioner using geothermal heat that can improve durability.

  In recent years, due to demands for energy saving, an air conditioner using geothermal heat has been proposed (see, for example, Patent Document 1 below). As this type of typical air conditioner, what is called a so-called cool tube is known that supplies the underground heat exchange section buried in the ground to the inside of the building via the outside air.

  As shown in FIG. 9, the underground heat exchanging portion a has a branch portion having a vertical pipe portion b extending in the vertical direction and a branch pipe portion c branched from the vertical pipe portion b and projecting laterally. d is provided. Such a branch part d is connected to, for example, an introduction part e for introducing outside air or a supply part f for supplying heat exchanged outside air into the building, and can smoothly guide the outside air.

JP 2010-223511 A

  However, when the underground heat exchange part a as described above is buried in the ground, it is difficult to sufficiently compact the soil in the lower part cd of the branch pipe part c, and the density of the soil is relatively relative to the part. It tends to be small. For this reason, the branch pipe portion c receives a large longitudinal load g from the upper part, and the bending moment of the branch pipe portion c with respect to the vertical pipe portion b is increased, so that the branch portion d is easily damaged. Furthermore, the joint part j1 between the introduction part e and the branch part d and the joint part j2 between the supply part f and the branch part d are liable to be damaged. In particular, the above damage is likely to occur during an earthquake that generates a large longitudinal load.

  The present invention has been devised in view of the actual situation as described above, and is based on the provision of protective means for reducing the bending moment of the branch pipe portion with respect to the vertical pipe portion, and the use of underground heat that can improve the durability. The main purpose is to provide an air conditioner.

  The invention according to claim 1 of the present invention is an air conditioner using geothermal heat for exchanging heat from the outside air with underground heat and supplying it to the inside of the building. It has a pipe-shaped underground heat exchanging part for exchanging heat, and the underground heat exchanging part includes a vertical pipe part extending in the vertical direction and a branch pipe part branched from the vertical pipe part and protruding sideways. And a protective means for reducing a bending moment of the branch pipe portion with respect to the vertical pipe portion.

  According to a second aspect of the present invention, in the first aspect of the present invention, the protection means includes a flexible tube portion that is connected to at least one of the upper and lower portions of the vertical pipe portion and is deformable at least in the vertical direction. It is an air conditioner using geothermal heat.

  Further, the invention according to claim 3 is the air conditioner using geothermal heat according to claim 2, wherein the flexible tube portion is disposed at an upper portion and a lower portion of the vertical pipe portion.

  According to a fourth aspect of the present invention, there is provided an air conditioner using geothermal heat according to the second or third aspect, wherein the flexible tube portion is a flexible pipe that can be bent and deformed.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the protection means includes a cover member that covers the branch pipe portion from the upper side at one end side and is fixed to the vertical pipe at the other end side. It is an air conditioner using geothermal heat as described in 1.

  According to a sixth aspect of the present invention, the cover member includes a cover body having a U-shaped cross section that covers the upper part and both side parts of the branch pipe part, and an outer peripheral surface of the vertical pipe part that is connected to the cover body. The air conditioner using geothermal heat according to claim 5 including a catch portion that can be opened and closed so as to be able to be held.

  The air conditioner using geothermal heat of the present invention exchanges the outside air with geothermal heat and supplies it to the inside of the building. This air conditioner has a pipe-shaped underground heat exchanging section that is buried in the ground and exchanges heat of the outside air with underground heat.

  Such an air conditioner can supply high-temperature outside air to the building in the summer by cooling it in the underground heat exchanger. In winter, cold outdoor air can be warmed by the underground heat exchanger and supplied into the building. Thereby, the air conditioner can air-condition the room without using large energy such as an air conditioner, and can improve energy saving.

  The underground heat exchanging section includes a branch section having a vertical pipe section extending in the vertical direction and a branch pipe section branched from the vertical pipe and protruding sideways, and the branch pipe section is bent with respect to the vertical pipe section. Protection means are provided to reduce the moment.

  Such a protection means can prevent damage to the branch portion due to the bending moment, and can improve durability.

It is sectional drawing which shows notionally the air-conditioning apparatus using geothermal heat of this embodiment. It is a perspective view which shows an underground heat exchange part. It is a fragmentary sectional view of the 1st vertical pipe. It is a fragmentary sectional view of the 2nd vertical pipe. It is a fragmentary sectional view of a flexible tube part. It is a partial side view of the 1st vertical pipe of other embodiments. It is a partial side view of the 2nd vertical pipe of other embodiments. It is an enlarged view of a cover member. It is a partial side view of the conventional underground heat exchange part.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, an air conditioner (hereinafter sometimes simply referred to as “air conditioner”) 1 according to the present embodiment is an air conditioner for a building H such as a general house or building. The outside air A is heat exchanged with underground heat and supplied to the inside of the building H.

  In such an air conditioner 1, the outside air A supplied to the underfloor space 7 passes from the openings 10 a and 10 b provided in the floor portion to the living rooms L through the air flow paths formed inside the building H. Supplied with. As a result, the air conditioner 1 can cool the high temperature outside air A in the summer by the underground heat exchange section 1A and supply it to the inside of the building. In winter, the cold outside air A can be warmed by the underground heat exchange section 1A. Can be supplied inside the building. Therefore, the air conditioner 1 can air-condition the inside of the building H without using large energy such as an air conditioner, and can improve energy saving.

  The air conditioner 1 of this embodiment is provided adjacent to the building H. The air conditioner 1 is provided with, for example, a pipe-shaped underground heat exchange section 1A that is embedded in the underground G such as a garden and exchanges heat of the outside air A with underground heat.

  As shown in FIGS. 1 and 2, the underground heat exchanging portion 1 </ b> A of the present embodiment includes a flexible tube 2 that can be bent, an introduction portion 3 that introduces outside air into the flexible tube 2, and the flexible tube 2. A first relay that relays between the supply section 4 that supplies the outside air A heat-exchanged by the pipe 2 to the inside of the building H (in this embodiment, the underfloor space 7), and the flexible pipe 2 and the introduction section 3. A vertical pipe 5 and a second vertical pipe 6 that relays between the flexible tube 2 and the supply unit 4 are configured.

  The flexible tube 2 is embedded at a depth of about 1 to 4 m from the ground surface, for example, and extends in a vertical spiral shape in which the spiral axis 2s is in the vertical direction. In the present embodiment, one end 2 i of the flexible tube 2 communicates with the introduction part 3 via the first vertical pipe 5, and the other end 2 o communicates with the supply part 4 via the second vertical pipe 6, and one end 2 i And the other end 2o are wound approximately twice in the vertical direction.

  The flexible tube 2 has a drainage gradient α1 that is inclined downward from the one end 2i side toward the other end 2o side. As a result, the flexible tube 2 can smoothly drain the dew condensation that has occurred therein to the other end 2o along the inclination, and effectively suppress the generation of mold and off-flavors caused by the dew condensation. Yes. The drainage gradient α1 of the flexible tube 2 is desirably about 1/80 to 1/120.

  The flexible tube 2 is a flexible pipe that can be bent and deformed at an arbitrary position in the longitudinal direction. Since such a flexible tube 2 is excellent in flexibility, even if a large load is applied when earth pressure or an earthquake occurs, the flexible tube 2 can be flexibly deformed following the above, and durability can be improved. Moreover, since the flexible tube 2 extends in a vertical spiral shape, it is possible to reduce the occupied land area while maintaining the volume of the space for heat exchange of the outside air A. Therefore, the underground heat exchange part 1A is excellent in space saving and versatility.

  In addition, since the underground heat exchanging portion 1A of the present embodiment is configured to include one or several flexible tubes 2, the tubes are connected to each other compared to the conventional underground heat exchanging portion. Joint locations can be greatly reduced. Thereby, 1 A of underground heat exchange parts can suppress effectively the damage which tends to arise in a joint location while being able to improve workability and low cost property.

  In order to effectively exhibit heat exchange with the underground heat, the flexible tube 2 preferably has an inner diameter D1 of, for example, about 100 to 300 mm. The interval W2 is desirably set to 300 to 500 mm. Furthermore, although it does not specifically limit as the flexible tube 2, For example, it is desirable to consist of a synthetic resin or a metal.

  In the present embodiment, the flexible tube 2 extends in a vertical spiral shape, but is not limited thereto. For example, the flexible tube 2 may extend in a zigzag shape in the vertical direction. Such a flexible tube 2 can also occupy a small land area while maintaining a space necessary for heat exchange of the outside air A.

  As shown in FIG. 1, the introduction part 3 includes an inclined part 3A extending from the first vertical pipe 5 toward the ground, and an outside air introduction part 3B extending from the end of the inclined part 3A to the ground. Including.

  In addition, it is desirable that the angle α2a formed by the inclined portion 3A and the outside air introduction portion 3B is set to an obtuse angle. Thereby, the introduction part 3 can reduce the air resistance between the inclined part 3A and the outside air introduction part 3B, and can smoothly guide the outside air A. The angle α2a is desirably 120 to 150 degrees.

  One end 3Bi of the outside air introduction portion 3B is connected to an opening 11 that is exposed to the ground and that is curved downward by about 180 degrees and opens downward. Such an opening part 11 can prevent rainwater or the like from entering the outside air introduction part 3B. Further, it is desirable that a filter (not shown) for preventing insects and foreign substances from entering is arranged in the opening 11.

  The supply section 4 includes an inclined section 4A extending from the second vertical pipe 6 toward the ground, and an outside air supply section extending upward from the end of the inclined section 4A and opening in the underfloor space 7 of the building H. 4B.

  Moreover, as for the supply part 4, it is desirable for the angle (alpha) 2b which 4A of inclination parts and the external air supply part 4B make to set to an obtuse angle. Thereby, the supply part 4 can make small the air resistance between 4 A of inclination parts, and the external air supply part 4B, and can guide the external air A smoothly. The angle α2b of the supply unit 4 is preferably set in the same range as the angle α2a of the introduction unit 3.

  An intake fan 41 that forcibly sucks air is connected to the outside air supply unit 4B at an opening 12 provided at one end 4Bi thereof. Such an intake fan 41 can make the inside of the underground heat exchanging section 1A, the introduction section 3 and the supply section 4 have a negative pressure and forcibly allow the outside air A to pass through, thereby improving the air conditioning efficiency.

  As shown in FIGS. 2 and 3, the first vertical pipe 5 is provided with a plurality of pipe portions 21 extending in the vertical direction and a branch portion 22 for connecting a pair of pipe portions 21 adjacent in the vertical direction.

  The pipe portion 21 has an inner diameter D3 of, for example, about 150 to 250 mm.

  The branch portion 22 includes a first branch portion 22A that connects one end 2i of the flexible tube 2 and a second branch that is provided above the first branch portion 22A and connects the inclined portion 3A of the introduction portion 3. Part 22B.

  The first branch portion 22A includes a vertical pipe portion 25A that extends vertically with an inner diameter equal to the inner diameter D3 of the pipe portion 21, and a branch pipe portion 26A that branches from the vertical pipe portion 25A and protrudes laterally.

  The vertical pipe portion 25A is provided with a pair of enlarged diameter portions 25At and 25At at the upper and lower ends thereof, into which the end portion 21t of the pipe portion 21 can be densely inserted. Further, the branch pipe portion 26A is formed with an enlarged diameter portion 26At capable of closely communicating the one end 2i of the flexible tube 2 at the end thereof. Further, the branch pipe portion 26A extends downwardly from the vertical pipe portion 25A toward the enlarged diameter portion 26At.

  Such a first branch portion 22A can bend the outside air A introduced into the first vertical pipe 5 at an obtuse angle and guide it to the flexible tube 2, and the first vertical pipe 5 and the flexible tube can be guided. The air resistance between the two can be reduced. In order to effectively exhibit such an action, the angle α3a formed by the vertical pipe portion 25A and the branch pipe portion 26A of the first branch portion 22A is preferably about 120 to 150 degrees.

  Similar to the first branch portion 22A, the second branch portion 22B includes a vertical pipe portion 25B extending in the vertical direction and a branch pipe portion 26B branching from the vertical pipe portion 25B and projecting laterally. A pair of enlarged diameter portions 25Bt are provided at both ends of the vertical pipe portion 25B. Further, the branch pipe part 26B protrudes from the vertical pipe part 25B and extends upwardly at a position rotated 180 degrees around the vertical axis from the branch pipe part 26A of the first branch part 22A. Further, the branch pipe portion 26A is provided with an enlarged diameter portion 26Bt at its end portion, which can communicate with the inclined portion 3A of the introduction portion 3 in a tight manner.

  Such a second branch part 22B can bend the outside air A introduced from the introduction part 3 at an obtuse angle and guide it to the first branch part 22 side, and between the introduction part 3 and the first branch part 22A. The air resistance can be reduced. In addition, the angle α3b formed by the vertical pipe portion 25B and the branch pipe portion 26B of the second branch portion 22B is preferably in the same range as the angle α3a of the first branch portion 22A.

  As shown in FIG. 4, the second vertical pipe 6 includes a plurality of pipe portions 21 extending in the vertical direction and a pair of adjacent pipe portions 21 in the same manner as the first vertical pipe 5 (shown in FIG. 3). And a branch portion 22 to be connected.

  The branch portion 22 is provided at a position higher than the third branch portion 22C for connecting the other end 2o of the flexible tube 2 and the third branch portion 22C, and is connected to the inclined portion 4A of the supply portion 4. Branch part 22D.

  Similarly to the first and second branch portions 22A and 22B (shown in FIG. 3), the third branch portion 22C has a vertical pipe portion 25C extending in the up-down direction, and branches from the vertical pipe portion 25C to the side. Branch pipe part 26C protruding to A pair of enlarged diameter portions 25Ct are provided at both ends of the vertical pipe portion 25C. Further, the branch pipe part 26C is inclined upward from the vertical pipe part 25C, and an enlarged diameter part 26Ct capable of closely communicating the other end 2o of the flexible tube 2 is provided at an end thereof.

  In such a third branch portion 22C, the branch pipe portion 26C has an inclination for guiding the drainage 30 in the flexible tube 2 to the bottom portion 6b of the second vertical pipe 6, so that moisture is contained in the flexible tube 2. Generation | occurrence | production of the mold and off-flavor by staying can be suppressed effectively. The inclination α3c of the branch pipe portion 26C is preferably the same as the drainage gradient α1 of the flexible tube 2.

  Similar to the third branch portion 22C, the fourth branch portion 22D includes a vertical pipe portion 25D extending in the vertical direction and a branch pipe portion 26D branching from the vertical pipe portion 25D and projecting laterally. The vertical pipe portion 25D is provided with a pair of enlarged diameter portions 25Dt at both ends thereof. Further, the branch pipe part 26D protrudes from the vertical pipe part 25D and extends upwardly at a position rotated 180 degrees around the vertical axis from the branch pipe part 26C of the third branch part 22C. This branch pipe part 26D is provided with an enlarged diameter part 26Dt capable of closely communicating the inclined part 4A of the supply part 4.

  Such a fourth branch portion 22D can guide the outside air A introduced from the second vertical pipe 6 to the supply portion 4 by bending it at an obtuse angle, thereby reducing the air resistance. The angle α3d formed by the vertical pipe portion 25D and the branch pipe portion 26D of the fourth branch portion 22D has the same range as the angles α3a and α3b (shown in FIG. 6) of the first and second branch portions 22A and 22B. desirable.

  By the way, as shown in FIG.3 and FIG.4, at the time of construction of underground heat exchanging part 1A, after excavating the ground and making a hole, underground heat exchanging part 1A is installed, Is buried and buried in the ground. At this time, since it is difficult to sufficiently compact the soil below the branch pipe portions 26A to 26D of the first to fourth branch portions 22A to 22D, the density of the soil tends to be relatively small in that portion.

  For this reason, each branch pipe part 26A-26D receives the big vertical load F from upper part, the bending moment of branch pipe part 26A-26D with respect to vertical pipe part 25A-25D becomes large, and each branch part 22A-22D is damaged. There was a problem that it was easy.

  Further, along with the damage of each of the branch portions 22A to 22D, the connection portion between the first branch portion 22A and the one end 2i of the flexible tube 2, the connection portion between the second branch portion 22B and the inclined portion 3A of the introduction portion 3, There is also a problem that the connecting portion between the third branch portion 22C and the other end 2o of the flexible tube 2 and the connecting portion between the fourth branch portion 22D and the inclined portion 4A of the supply portion 4 are easily damaged. In particular, the above damage is likely to occur during an earthquake that generates a large longitudinal load.

  In order to prevent such damage, the air conditioner 1 of the present embodiment is provided with protection means 27 for reducing the bending moment of each branch pipe portion 26A to 26D with respect to the vertical pipe portions 25A to 25D.

  The protection means 27 of the present embodiment includes a flexible tube portion 27A that is connected to at least one of the upper and lower portions of the vertical pipe portions 25A to 25D, in this embodiment, the upper portion and the lower portion, and is deformable at least in the vertical direction.

  The flexible tube portion 27A of the present embodiment constitutes the pipe portion 21, and in a cross section along the longitudinal direction shown enlarged in FIG. 5, the side wall surface 27W extends along the longitudinal direction with the base portion 27Wa. And a ridge portion 27Wb that protrudes outward from the base portion 27Wa and is spaced apart in the longitudinal direction, and is formed as a flexible pipe having an inner surface formed flat. In addition, the crest portion 27Wb is provided with a hollow portion 29 inside thereof.

  Thereby, the flexible tube portion 27A can be bent at an arbitrary position in the longitudinal direction while keeping the inner surface of the side wall surface 27W smooth, and is excellent in flexibility. Moreover, since the cavity portion 29 is provided in the peak portion 27Wb, it is useful for reducing the weight of the flexible tube portion 27A while maintaining the strength of the flexible tube portion 27A (holding a circular shape). The flexible tube portion 27A is not particularly limited, but is preferably made of, for example, synthetic resin or metal.

  Since such a flexible tube portion 27A can be deformed and / or bent in the vertical direction following the longitudinal load F acting on the branch pipe portions 26A to 26D, each of the branch portions 22A to 22D can be deformed. The position of the longitudinal load F can be shifted in the direction of escaping.

  Therefore, the flexible tube portion 27A can reduce the bending moment of the branch pipe portions 26A to 26D with respect to the vertical pipe portions 25A to 25D, and can be damaged with the branch portions 22A to 22D or the first branch portion 22A. A connection portion between one end 2i of the flexible tube 2, a connection portion between the second branch portion 22B and the inclined portion 3A of the introduction portion 3, a connection portion between the third branch portion 22C and the other end 2o of the flexible tube 2, and It is also possible to prevent damage to the connecting portion between the four branch portion 22D and the inclined portion 4A of the supply portion 4.

  Moreover, in this embodiment, since it arrange | positions at the upper part and the lower part of each vertical pipe part 25A-25D, respectively, each branch part 22A-22D can be displaced more flexibly, and each branch part 22A-22D can be displaced. Damage can be prevented more effectively.

6 and 7 show a protection means 27 according to another embodiment of the present invention.
The protection means 27 according to this embodiment includes a cover member 27B that covers the branch pipe portions 26A to 26D from the upper side on one end side and the other end side that is fixed to the vertical pipe portions 25A to 25D.

  The cover member 27 </ b> B of the present embodiment includes a cover main body 31 that covers the branch pipe portions 26 </ b> A to 26 </ b> D, and a catch portion 32 that is connected to the cover main body 31.

  As shown in FIGS. 6, 7, and 8, the cover main body 31 is formed in a substantially U-shaped cross section that continuously covers from the upper part of the branch pipe parts 26 </ b> A to 26 </ b> D to both side parts. The cover main body 31 has an inner surface 31 s spaced from the upper and both sides of each branch pipe portion 26A.

  The catch portion 32 is fixed to the other end 31o of the cover main body 31, and has a semi-cylindrical first catch piece 32A covering the outer peripheral surfaces 25As to 25Ds on one end side of the vertical pipe portion 25A, and the first catch piece 32A. And a semi-cylindrical second catch piece 32B that covers the outer peripheral surfaces 25As to 25Ds on the other end side of the vertical pipe portion 25A.

  Each catch piece 32A, 32B has a length L5 in the vertical direction substantially the same as the length L2 between the pair of enlarged diameter portions 25At-25Dt of the vertical pipe portions 25A-25D. Here, “substantially the same” means that the length L5 of each of the catch pieces 32A and 32B is the same as the length L2 of each of the vertical pipe portions 25A to 25D, or about 5 to 10 mm smaller than the length L2. means.

  Further, the first and second catch pieces 32A and 32B are provided with flanges 32Af and 32Bf protruding in a hook shape at one end thereof, respectively. The flanges 32Af and 32Bf are provided with a pair of holes 32Ah and 32Bh that are spaced apart from each other in the vertical direction.

  The other ends of the first and second catch pieces 32A and 32B are connected by a hinge 32h. Accordingly, the first and second catch pieces 32A and 32B continuously cover the outer peripheral surfaces 25As to 25Ds of the vertical pipe portions 25A to 25D, and the flanges 32Af and 32Bf are in contact with each other, and the flanges 32Af and 32Bf are connected to each other so as to be openable and closable between the opened state and the separated state.

  In such a cover member 27B, in the closed state, the cover body 31 covers the branch pipe portions 26A to 26D, and the first and second catch pieces 32A and 32B are the outer peripheral surfaces of the vertical pipe portions 25A to 25D. It can hold between 25 As and 25 Ds. Further, in the cover member 27B, the length L5 of the catch pieces 32A, 32B in the vertical direction is set to be substantially the same as the length L2 between the enlarged diameter portions 25At to 25Dt of the vertical pipe portions 25A to 25D. Therefore, the upper and lower ends of the catch pieces 32A and 32B are held between the enlarged diameter portions 25At to 25Dt. Then, the bolts 33 are inserted into the holes 32Bh of the flanges 32Af and 32Bf of the catch pieces 32A and 32B and fastened with the nuts 34, whereby the cover member 27B is firmly fixed to the branch portions 22.

  Thereby, the cover member 27B can mainly receive the longitudinal load F conventionally received by the branch pipe portions 26A to 26D by covering the branch pipe portions 26A to 26D. Further, the vertical load F received by the cover member 27B is transmitted to the vertical pipe portions 25A to 25D without being transmitted to the branch pipe portions 26A to 26D.

  Therefore, the cover member 27B can suppress generation of bending moments of the branch pipe portions 26A to 26D with respect to the vertical pipe portions 25A to 25D. Therefore, the cover member 27B can prevent the branch portion 22 from being damaged.

  In order to effectively exhibit the above action, it is desirable that the cover main body 31 of the cover member 27B extends from the vertical pipe portions 25A to 25D beyond the enlarged diameter portions 26At to 26Dt of the branch pipe portions 26A to 26D. . Thereby, the cover main body 31 can prevent reliably that each branch pipe part 26A-26D receives the big vertical load F, and can improve durability.

  The cover member 27B is preferably made of a metal such as steel, aluminum, or stainless steel, or a resin from the viewpoint of reliably supporting the longitudinal load F.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect. For example, the protection means 27 may be composed of both the flexible tube portion 27A and the cover member 27B. Such a protection means 27 can more reliably prevent damage to the branch portions 22A to 22D.

DESCRIPTION OF SYMBOLS 1 Air conditioner using geothermal heat 1A Ground heat exchange part 22 Branch part 25A-25D Vertical pipe part 26A-26D Branch pipe part 27 Protection means

Claims (6)

It is an air conditioner using geothermal heat that exchanges outside air with geothermal heat and supplies it to the inside of the building,
It has a pipe-like underground heat exchange part that is buried in the ground and exchanges heat with the outside air using underground heat,
The underground heat exchanging part includes a branch part having a vertical pipe part extending in the vertical direction and a branch pipe part branching from the vertical pipe part and projecting sideways.
An air conditioner using geothermal heat, characterized in that protective means for reducing a bending moment of the branch pipe portion with respect to the vertical pipe portion is provided.   2. The air conditioner using geothermal heat according to claim 1, wherein the protection means includes a flexible pipe portion that is connected to at least one of an upper portion and a lower portion of the vertical pipe portion and is deformable at least in the vertical direction.   The said flexible pipe part is an air-conditioning apparatus using geothermal heat of Claim 2 arrange | positioned at the upper part and the lower part of the said vertical pipe part.   The air conditioner using geothermal heat according to claim 2 or 3, wherein the flexible tube portion is a flexible pipe that can be bent and deformed.   5. The air conditioner using geothermal heat according to claim 1, wherein the protection means includes a cover member that covers the branch pipe portion from the upper side on one end side and is fixed to the vertical pipe on the other end side. .   The cover member includes a cover body having a U-shaped cross section that covers an upper portion and both side portions of the branch pipe portion, and a catch portion that is connected to the cover body and that can be opened and closed so as to be able to hold the outer peripheral surface of the vertical pipe portion. An air conditioner using geothermal heat according to claim 5.

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