JP2013002806A - Flow path switching type geothermal water circulation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow path switching type geothermal water circulation apparatus capable of suppressing its manufacturing cost by simplifying its structure and further suppressing its installation cost by taking advantage of the existing wells.SOLUTION: The flow path switching type geothermal water circulation apparatus includes an outer pipe 2 to be buried to a depth having an aquifer L, an inner pipe 3 arranged within the outer pipe 2, a top strainer 4 provided on the outer pipe 2, a bottom strainer 5 provided on the inner pipe 3, and a circulation shield unit 14 that shields vertical circulation within the outer pipe 2, a pump 8 for outer pipe that lifts geothermal water contained within the outer pipe 2, a pump 9 for inner pipe that lifts geothermal water contained within the inner pipe, a heat exchanging means 10 that performs heat exchange using the geothermal water as a heat source, a restoration pipe 11 for outer pipe that restores the geothermal water into the outer pipe 2, a restoration pipe 12 for inner pipe that restores the geothermal water into the inner pipe 3, and a mode switching means 13 that performs switching between a first mode and a second mode.

Description

  The present invention relates to a flow path switching type geothermal water circulation device that circulates and uses geothermal water in an aquifer.

  Generally, the underground temperature is almost constant throughout the year. Therefore, the underground in summer tends to be lower than the outside temperature, and the underground in winter tends to be higher than the outside temperature. Moreover, since the temperature of the geothermal water contained in the underground aquifer depends on the temperature of the ground, there is a tendency similar to the above.

  Therefore, attempts have been made so far to draw up geothermal water in the aquifer and use it as a heat source for cooling in the summer and as a heat source for heating in the winter.

  For example, in the patent No. 3927593, the inventor of the present application disclosed an outer tube having a strainer, a heat insulating inner tube inserted into the outer tube, and a flow passage formed between the heat insulating inner tube and the outer tube. A pump for pumping geothermal water from inside the heat insulation interior pipe, a heat source supply pump pipe for pumping the geothermal water pumped by the pump, and a heat source reduction pipe for pumping the geothermal water after being used to the flow passage Has proposed a double-pipe geothermal water circulation device with a patent right (Patent Document 1). According to this patent document 1, since geothermal water after use is reduced to an aquifer through a strainer, it is said that there is no concern about well drainage or ground subsidence due to excessive sampling.

  However, in the invention described in Patent Document 1, foreign matters such as mud and sand when the geothermal water is filtered are deposited on the aquifer side of the strainer, which may cause clogging. Moreover, when clogging arises, it is thought that it is difficult to eliminate this.

  Therefore, the present inventor, in Japanese Patent No. 4564106, an exterior tube, an interior tube disposed in the exterior tube, a geothermal water suction pump disposed in the interior tube, a strainer provided in the exterior tube, Suction of geothermal water in the upper and lower flow passages formed by closing the flow passage formed between the outer pipe and the inner pipe so as to be divided vertically, and geothermal water in the lower flow passage The first circulation mode that sucks in the pump and reduces the geothermal water after use from the upper flow path to the aquifer, and the geothermal water in the upper flow path is sucked in by the geothermal water suction pump, A flow path switching type having a second circulation mode for reducing geothermal water from the lower flow passage to the aquifer, and mode switching means for switching between the first circulation mode or the second circulation mode. Proposed geothermal water circulation device and obtained a patent ( Patent Document 2). According to this Patent Document 2, by appropriately switching between the first circulation mode and the second circulation mode, it is possible to cause the action of causing foreign matter accumulated on the aquifer side of the strainer to flow out to the aquifer side. It is said that clogging can be prevented.

Japanese Patent No. 3927593 Japanese Patent No. 4564106

  However, in the invention described in Patent Document 2, the geothermal water suction pump is installed only in the interior pipe, and the geothermal water to be pumped is always supplied into the interior pipe. To switch between the circulation modes, a complicated flow path is required. Therefore, since the manufacturing cost is increased, there has been a need to simplify the structure and to reduce the manufacturing cost and increase the practical use.

  Moreover, in the invention described in Patent Document 2, it is necessary to previously provide a structure for dividing the flow passage vertically in an outer tube or the like. For example, Patent Document 2 proposes a configuration that includes a support portion in an outer tube and a locking portion of the inner tube, or that fixes the outer tube and the inner tube with a partition or the like.

  However, what has been proposed in Patent Document 2 is a factor that increases the installation cost because it is necessary to newly manufacture and bury the outer tube having the above-described configuration. Therefore, if an existing well can be used as an outer tube, the installation cost can be reduced.

  The present invention has been made in order to meet such needs, and it is possible to reduce the manufacturing cost by simplifying the structure and to reduce the installation cost by using an existing well. The object is to provide a switchable geothermal water circulation device.

  The flow path switching type geothermal water circulating apparatus according to the present invention comprises an outer tube buried from the surface to a depth having at least one aquifer, and an aquifer disposed in the outer tube and in contact with at least the outer tube. An inner pipe buried to a deeper position, an upper strainer provided in a position in contact with the aquifer in the outer pipe, a lower strainer provided in a position in contact with the aquifer in the inner pipe, and the outer pipe An outflow prevention part formed between the aquifer in contact with the inner pipe and the aquifer in contact with the interior pipe and configured to prevent outflow of geothermal water flowing in from the upper strainer, An exterior pipe pump that is disposed between the interior pipe and the exterior pipe and pumps up the geothermal water flowing into the exterior pipe, and a geothermal water that is disposed within the interior pipe and flows into the interior pipe. A pump for an interior pipe to be raised, a heat exchange means for exchanging heat using the geothermal water pumped up by the pump for the exterior pipe or the pump for the interior pipe, and the geothermal water after being used by the heat exchange means as the exterior A reduction pipe for an exterior pipe that returns to the interior of the pipe, a reduction pipe for the interior pipe that reduces the geothermal water used by the heat exchange means to the interior of the interior pipe, and operates the pump for the exterior pipe and operates the interior Mode switching means for switching between a first mode for opening the pipe reduction pipe and a second mode for operating the inner pipe pump and opening the outer pipe reduction pipe.

  Further, the flow path switching type geothermal water circulation device according to the present invention includes an outer tube buried from the surface to a depth having at least a plurality of aquifers, and is disposed in the outer tube and has at least one aquifer. Shields the upper and lower circulation in the outer tube provided between the inner pipe embedded to a deep position and the upper aquifer on the upper side and the lower aquifer on the lower side among the plurality of aquifers An upper strainer provided at a position in contact with the upper aquifer in the outer tube, a lower strainer provided at a position in contact with the lower aquifer in the outer tube, and above the distribution shield. A pump for an exterior pipe that is disposed between the interior pipe and the exterior pipe and pumps up the geothermal water flowing into the exterior pipe, and pumps the geothermal water that is disposed within the interior pipe and flows into the interior pipe An internal pipe pump, heat exchange means for exchanging heat using the geothermal water pumped by the exterior pipe pump or the internal pipe pump as a heat source, and the geothermal water after being used by the heat exchange means An exterior pipe reduction pipe for reducing the interior pipe into the exterior pipe, an interior pipe reduction pipe for reducing the geothermal water used by the heat exchange means into the interior pipe, and operating the exterior pipe pump Mode switching means for switching between a first mode for opening the internal pipe reduction pipe and a second mode for operating the internal pipe pump and opening the external pipe reduction pipe.

  Further, as one aspect of the present invention, the outlet of the outer pipe reducing pipe and the outlet of the inner pipe reducing pipe are arranged at a position deeper than the dynamic water level, and a position deeper than the dynamic water level in the outer pipe and the inner pipe. In addition, an air blocking unit that blocks contact between the geothermal water and air may be installed.

  Furthermore, as one aspect of the present invention, the flow shield part includes a ductable plate material having an interior tube insertion hole through which the interior tube is inserted, and an outer peripheral edge of the ductile plate material by sandwiching the ductile plate material from above and below. It is also possible to have a pinching member that closely contacts the inner wall of the outer tube.

  Further, as one aspect of the present invention, the flow shield part has a plurality of the ductile plate members, and each of the ductile plate members is divided into two by a cut surface that divides the interior pipe insertion hole. In addition, the cut surfaces of the ductile plates that are in contact with each other may be overlapped while being shifted in the circumferential direction.

  According to the present invention, the manufacturing cost can be reduced by simplifying the structure, and the installation cost can be reduced by using an existing well.

It is a front longitudinal cross-sectional view which shows the 1st mode in 1st embodiment of the flow-path switching type geothermal water circulation apparatus which concerns on this invention. It is a front longitudinal cross-sectional view which shows the 2nd mode in 1st embodiment of the flow-path switching type geothermal water circulation apparatus which concerns on this invention. It is a front longitudinal cross-sectional view which shows the 1st mode in 2nd embodiment of the flow-path switching type geothermal water circulation apparatus which concerns on this invention. It is a front longitudinal cross-sectional view which shows the 2nd mode in 2nd embodiment of the flow-path switching type geothermal water circulation apparatus which concerns on this invention. It is a front view which shows the distribution | circulation shielding part in this 2nd embodiment. It is a top view which shows the distribution | circulation shielding part in this 2nd embodiment. It is a left view of FIG. 5 which shows the distribution | circulation shielding part in this 2nd embodiment. It is a top view which shows the 1st ductile board | plate material in this 2nd embodiment. It is a front view which shows the 1st ductile board | plate material in this 2nd embodiment. It is a top view which shows the 2nd ductile board | plate material in this 2nd embodiment. It is a front view which shows the 2nd ductile board | plate material in this 2nd embodiment. It is a top view which shows the 3rd ductile board | plate material in this 2nd embodiment. It is a front view which shows the 3rd ductile board | plate material in this 2nd embodiment. It is a top view which shows the 4th ductile board | plate material in this 2nd embodiment. It is a front view which shows the 4th ductile board | plate material in this 2nd embodiment. It is a top view which shows the upper pinching member in this 2nd embodiment. It is a front view which shows the upper pinching member in this 2nd embodiment. It is a top view which shows the lower pinching member in this 2nd embodiment. It is a front view which shows the lower pinching member in this 2nd embodiment.

  Hereinafter, a first embodiment of a flow path switching type geothermal water circulation apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a front longitudinal sectional view showing the state of the first mode in the flow path switching type geothermal water circulating apparatus 1A of the first embodiment.

  From FIG. 1, the flow path switching type geothermal water circulation device 1A of the first embodiment mainly includes an outer tube 2 embedded in the ground, an inner tube 3 arranged in the outer tube 2, and the outer tube. 2, an upper strainer 4 provided on the side surface of the inner pipe 3, a lower strainer 5 provided on the side surface of the inner tube 3, an outflow prevention unit 6 configured as a bottom portion provided below the outer tube 2, the outer tube 2 and An air blocking part 7 provided in the vicinity of the ground surface of the inner pipe 3, an outer pipe pump 8 arranged in the outer pipe 2, an inner pipe pump 9 arranged in the inner pipe 3, and a geothermal heat pumped up Heat exchanging means 10 for exchanging heat using water as a heat source, a reduction pipe 11 for an outer tube for reducing geothermal water after use into the outer tube 2, and reducing geothermal water after use into the inner tube 3 Reducing pipe 12 for interior pipe and the flow of geothermal water And a mode switching means 13 for switching to the first mode or the second mode. Hereinafter, each configuration will be described in detail.

  The outer tube 2 is a tube made of steel, resin, or the like, and is buried from the ground surface to a depth having at least one aquifer L in the ground having a plurality of aquifers L.

  The inner pipe 3 is a pipe made of steel, resin, or the like. The inner pipe 3 is disposed in the outer pipe 2 and has a deep aquifer L at a position deeper than at least the aquifer L in contact with the outer pipe 2. It is buried. Further, the inner tube 3 is disposed at a position eccentric from the center position of the outer tube 2 in order to dispose the outer tube pump 8 between the inner tube 3 and the outer tube 2. In addition, when the space sufficient to arrange | position the pump 8 for exterior pipes is formed between the exterior pipe 2 and the interior pipe 3, it is not necessary to arrange the interior pipe 3 in the eccentric position with respect to the exterior pipe 2 Good.

  The upper strainer 4 has a filter constituted by small gravel filled in a gap formed between the underground excavated for inserting the outer tube 2 and the outer tube 2. It is provided at a position in contact with the second aquifer L. The upper strainer 4 is for removing impurities such as sand and mud contained in the geothermal water flowing into the outer tube 2. Note that the filter of the upper strainer 4 may be formed of a wire mesh, a nonwoven fabric, or the like.

  Similar to the upper strainer 4, the lower strainer 5 has a filter constituted by small gravel filled in a gap formed between the underground excavated for inserting the inner pipe 3 and the inner pipe 3. And it is provided in the position of the aquifer L where the interior pipe 3 is in contact below the outflow prevention section 6 which is the bottom of the exterior pipe 2. Similar to the upper strainer 4, the lower strainer 5 removes impurities such as sand and mud contained in the geothermal water flowing into the interior pipe 3. Note that the filter of the lower strainer 5 may be formed of a wire mesh, a nonwoven fabric, or the like.

  The outflow prevention unit 6 is for closing the lower part of the outer tube 2 and functions in the first embodiment so that the geothermal water introduced from the upper strainer 4 does not flow out. The outflow prevention part 6 is formed with an interior pipe insertion hole 61 for allowing the interior pipe 3 to be inserted therethrough. The outflow prevention portion 6 may be formed integrally with the outer tube 2 and is formed as a separate body from the outer tube 2 and fixed below the outer tube 2 by welding, fitting, screwing or the like. May be.

  The air blocking part 7 is made of a plate-like member made of steel, resin, or the like, and is disposed at a position deeper than the moving water level W above the outer tube 2 and the inner tube 3. The air blocking section 7 blocks contact between the geothermal water in the outer tube 2 and the inner tube 3 and the air above it.

  The dynamic water level W is the level of geothermal water in each pipe when the outer pipe pump 8 or the inner pipe pump 9 is operated.

  The outer tube pump 8 is a pump for pumping up geothermal water in the outer tube 2, and is disposed between the inner tube 3 and the outer tube 2. In addition, the outer tube pump 8 in the first embodiment uses a submersible pump that can pump geothermal water from underwater in order to avoid contact between the geothermal water pumped up and air.

  The internal pipe pump 9 is a pump for pumping up the geothermal water in the internal pipe 3, and is disposed in the internal pipe 3. In addition, the inner pipe pump 9 in the first embodiment uses a submersible pump in order to avoid contact between the geothermal water to be pumped and the air, like the outer pipe pump 8.

  The exterior tube pump 8 and the interior tube pump 9 are not limited to submersible pumps. For example, a pump that cannot be used in water can be used. In the case of a pump that cannot be used underwater, the intake port of the pump is arranged at a position deeper than the dynamic water level W in the outer tube 8 or the inner tube 9, and the pump main body is provided in the ground or on the ground, so that the outer tube 2 The geothermal water in the interior or interior pipe 3 can be pumped up.

  The heat exchanging means 10 is composed of an air conditioner or the like that performs heat exchange using geothermal water as a heat source. In addition, instead of the heat exchange means 10 or together with the heat exchange means 10, a faucet may be provided so that geothermal water can be used as a water source.

  The outer pipe reduction pipe 11 is a pipe made of steel, resin, or the like, and is arranged from the heat exchange means 10 to the outer pipe 2. The outer pipe reducing pipe 11 is a pipe that reduces the geothermal water after being used by the heat exchange means 10 into the outer pipe 2. In addition, the outlet 111 at the lower end of the outer pipe reducing pipe 11 in the first embodiment is disposed at a position deeper than the dynamic water level W. This is to avoid contact between the geothermal water and the air when the geothermal water after use is reduced into the outer tube 2.

  The interior pipe reduction pipe 12 is a pipe made of steel, resin, or the like, and is arranged from the heat exchange means 10 to the interior pipe 3. The interior pipe reduction pipe 12 is a pipe that reduces the geothermal water after being used by the heat exchange means 10 into the interior pipe 3. Moreover, in order to avoid contact with geothermal water and air, the outflow port 121 in the lower end part of the internal pipe reduction pipe 12 in the first embodiment is the same as the outflow port 111 in the lower end part of the external pipe reduction pipe 11. It is arranged at a position deeper than the dynamic water level W.

  The mode switching means 13 switches between a first mode in which the exterior pipe pump 8 is operated and the interior pipe reduction pipe 12 is opened, and a second mode in which the interior pipe pump 9 is operated and the exterior pipe reduction pipe 11 is opened. Thus, the circulation direction of the geothermal water is switched. The mode switching means 13 in the first embodiment includes a pump control unit (not shown) and a reduction pipe switching control unit 131 for switching between the first mode and the second mode.

  The pump control unit performs on / off control of the operation of the outer tube pump 8 and the inner tube pump 9, and in the first mode, the outer tube pump 8 is operated and the inner tube pump 9 is stopped, In the second mode, the inner tube pump 9 is operated and the outer tube pump 8 is stopped.

  The reduction pipe switching control unit 131 has an electromagnetic valve or the like, and performs control to switch the flow path for sending geothermal water after use to the exterior pipe reduction pipe 11 or the interior pipe reduction pipe 12. In the first mode, the flow path on the inner pipe return pipe 12 side is opened, and in the second mode, the flow path on the outer pipe return pipe 11 side is opened.

  Next, the operation of each component of the flow path switching type geothermal water circulation device 1A in the first embodiment will be described with reference to FIGS.

  First, a case where each configuration is the first mode will be described. As shown in FIG. 1, in the first mode, the pump control unit of the mode switching unit 13 operates the outer tube pump 8 and stops the inner tube pump 9.

  The outer tube pump 8 pumps up the geothermal water in the outer tube 2 and sends it to the heat exchange means 10. In the first embodiment, since the submersible pump is used as the outer tube pump 8, the pumped geothermal water can be sent to the heat exchanging means 10 without contacting with air.

  In the outer tube 2, when geothermal water is pumped and the water level is lowered, the pressure in the outer tube 2 is also lowered accordingly. Therefore, the pressure on the aquifer L side becomes relatively high, and the geothermal water in the aquifer L passes through the upper strainer 4 and flows into the outer tube 2. As described above, the geothermal water in the outer tube 2 is supplied from the aquifer L as needed and can be continuously pumped by the outer tube pump 8.

  Further, since the outflow prevention part 6 blocks the lower part of the outer tube 2, geothermal water that passes through the upper strainer 4 and flows into the outer tube 2 can be stored in the outer tube 2.

  The upper strainer 4 filters foreign matters such as mud and sand contained in the aquifer L by a filter and cleans the geothermal water flowing into the outer tube 2.

  The heat exchange means 10 performs heat exchange using the pumped geothermal water as a heat source. For example, since the geothermal water is cooler than the outside air temperature in summer, the geothermal water is used as a heat source for cooling. In the winter season, geothermal water is hotter than the outside air temperature, so geothermal water is used as a heat source for heating.

  The reduction pipe switching control unit 131 of the mode switching means 13 controls the electromagnetic valve to open the interior pipe reduction pipe 11 with the flow path for sending the geothermal water after being used as the interior pipe reduction pipe 12 side.

  And the geothermal water after being used by the heat exchange means 10 in the first mode is sent into the interior pipe 3. At this time, since the outlet 121 of the internal pipe return pipe 12 is disposed at a position deeper than the dynamic water level W, geothermal water can be sent into the internal pipe 3 without contacting air.

  Moreover, when the geothermal water is sent into the interior pipe 3, the pressure in the interior pipe 3 is increased. Accordingly, the pressure on the aquifer L side becomes relatively low, and the geothermal water in the interior pipe 3 passes through the lower strainer 5 and is reduced to the aquifer L.

  Next, a case where each configuration is the second mode will be described. As shown in FIG. 2, in the second mode, the pump control unit of the mode switching unit 13 operates the internal pipe pump 9 and stops the external pipe pump 8. This is because the geothermal water is circulated in the direction opposite to the circulation direction in the first mode.

  The interior pipe pump 9 pumps up the geothermal water in the interior pipe 3 and sends it to the heat exchange means 10. Since the submersible pump is used like the outer tube pump 8, the pumped geothermal water can be sent to the heat exchanging means 10 without contacting with air.

  As the geothermal water in the interior pipe 3 is pumped up, the water level is lowered and the pressure in the interior pipe 3 is lowered. Accordingly, the pressure on the aquifer L side becomes relatively high, and the geothermal water in the aquifer L passes through the lower strainer 5 and flows into the interior pipe 3 as needed.

  Similar to the upper strainer 4, the lower strainer 5 filters foreign matters such as mud and sand contained in the aquifer L by a filter and cleans the geothermal water flowing into the interior pipe 3.

  Similarly to the first mode, the heat exchange means 10 performs heat exchange using the pumped geothermal water as a heat source.

  In the second mode, the reduction pipe switching control unit 131 of the mode switching means 13 controls the solenoid valve to switch the flow path for sending the geothermal water after use to the exterior pipe reduction pipe 11 side, and to reduce the exterior pipe reduction. The pipe 11 is opened.

  Moreover, since the outflow port 111 of the reduction pipe 11 for exterior pipes is arrange | positioned in the position deeper than the dynamic water level W similarly to the outflow port 121 of the reduction pipe 12 for interior pipes, without making geothermal water contact air. It can be sent into the outer tube 2. The outflow prevention unit 6 prevents outflow of geothermal water sent into the outer tube 2 from the outer tube 2.

  And when geothermal water is sent in the exterior pipe 2, the pressure in the exterior pipe 2 becomes high. Therefore, the pressure on the aquifer L side becomes relatively low, and the geothermal water in the outer tube 2 passes through the upper strainer 4 and is reduced to the aquifer L.

  In both the first mode and the second mode, the air blocking unit 7 blocks the contact between the geothermal water in the outer tube 2 and the inner tube 3 and the air above it. Therefore, 1 A of flow-path-switching-type geothermal water circulation apparatuses of this 1st embodiment can circulate geothermal water, without contacting air.

  On the other hand, foreign matter such as sand filtered by the upper strainer 4 or the lower strainer 5 adheres or accumulates on the aquifer L side that is outside the upper strainer 4 or the lower strainer 5. Therefore, if the use is continued in the same mode for a long time, the aquifer L side may be clogged.

  Therefore, in the first embodiment, the mode switching means 13 switches the mode to prevent the upper strainer 4 or the lower strainer 5 from being clogged.

  For example, in the first mode, foreign matter such as sand filtered by the upper strainer 4 is deposited on the aquifer L side of the upper strainer 4. Therefore, when the mode is switched to the second mode, as described above, in the second mode, the pressure in the outer tube 2 becomes higher, and the pressure on the aquifer L side becomes relatively lower. It passes through the strainer 4 and is reduced to the aquifer L. At this time, since foreign matters such as sand accumulated on the aquifer L side of the upper strainer 4 are pushed away to the aquifer L side, clogging can be eliminated.

  Similarly, in the second mode, foreign matters such as sand filtered by the lower strainer 5 are deposited on the aquifer L side of the lower strainer 5. Therefore, when the mode is switched to the first mode, the geothermal water in the interior pipe 3 passes through the lower strainer 5 and is reduced to the aquifer L, so that it accumulates on the aquifer L side of the lower strainer 5. Foreign matter such as sand is pushed away toward the aquifer L and clogging is eliminated.

  Therefore, clogging can be prevented by switching the mode as appropriate. Note that the timing for switching the mode is appropriately selected. Since the underground temperature is almost constant throughout the year, it is possible to continuously supply geothermal water having the same temperature whenever the mode is switched.

  The underground temperature is colder in summer and warmer in winter than the outside temperature. Accordingly, geothermal water is suitable as a heat source for cooling in summer and as a heat source for heating in winter, and the temperature of geothermal water can be efficiently used as a heat source throughout the year.

  In addition, since the used water can be reduced to each aquifer L by appropriately switching between the first mode and the second mode, it is possible to prevent the aquifer L from being depleted and The applied load can be reduced.

According to the flow path switching type geothermal water circulating apparatus 1A of the first embodiment as described above, the following effects can be obtained.
1. By arranging the pump for pumping up the geothermal water in both the outer pipe 2 and the inner pipe 3, the structure of the flow passage for circulating the geothermal water can be simplified.
2. Geothermal water can be circulated without contact with air. Therefore, generation | occurrence | production of the algae etc. in the flow-path switching type geothermal water circulation apparatus 1A can be suppressed.
3. The basic performance of the flow path switching type geothermal water circulating apparatus 1A for preventing the strainer from being clogged can be maintained without replacing the strainer.
4). By recycling geothermal water, we can provide a friendly system that is environmentally friendly.

  Next, a second embodiment of the flow path switching type geothermal water circulation apparatus according to the present invention will be described with reference to the drawings. Note that, in the configuration of the second embodiment, the same or equivalent configuration as the configuration of the first embodiment described above is denoted by the same reference numeral, and the description thereof is omitted.

  FIG. 3 is a front longitudinal sectional view showing a state of the first mode in the flow path switching type geothermal water circulating apparatus 1B of the second embodiment.

  From FIG. 3, the flow path switching type geothermal water circulation device 1B of the second embodiment mainly includes an outer tube 2, an inner tube 3, an upper strainer 4, a lower strainer 5, an air blocking portion 7, and an outer tube. It has a pump 8, an interior pipe pump 9, a heat exchange means 10, an exterior pipe reduction pipe 11, an interior pipe reduction pipe 12, and a mode switching means 13. Instead of the outflow prevention unit 6 formed at the bottom, a flow shielding unit 14 is provided.

  As shown in FIG. 3, the outer tube 2 in the second embodiment is embedded from the ground surface to a depth having a plurality of aquifers L. The outer tube 2 is provided with a strainer at a position in contact with the aquifer L.

  The distribution shielding unit 14 is installed at an arbitrary depth in the outer tube 2 and shields the upper and lower distribution in the outer tube 2. That is, the distribution shield 14 corresponds to the outflow prevention unit 6 of the outer tube 2 in the first embodiment, and the outer tube 2 below the distribution shield 14 has a function corresponding to the inner tube 3 in the first embodiment. It is something to have.

  Therefore, in the second embodiment, the strainer of the outer tube 2 provided in the upper aquifer UL above the distribution shield 14 becomes the upper strainer 4, and the lower aquifer below the distribution shield 14. The strainer provided in the layer LL becomes the lower strainer 5.

  As shown in FIGS. 5 to 7, the flow shielding portion 14 in the second embodiment includes a ductile plate member 15 and a pinching member 16 that sandwiches the ductile plate member 15. Hereinafter, the ductile plate material 15 and the holding member 16 will be described in detail.

  The ductile plate 15 is extended in the outer direction (radial direction) by being held by the holding member 16, and the outer peripheral edge thereof is in close contact with the inner wall of the outer tube 2, so that the upper and lower flow in the outer tube 2 is distributed. Is to shield. As shown in FIGS. 8 to 15, the ductile plate material 15 in the second embodiment includes a first ductile plate material 15 a, a second ductile plate material 15 b, a third ductile plate material 15 c, and a fourth ductile plate material 15 d. Become.

  The first ductile plate material 15a is the uppermost ductile plate material 15 and, as shown in FIGS. 8 and 9, two bolt insertion holes 151 through which the bolts 161 provided in the holding member 16 are inserted. And an internal pipe insertion hole 152 for allowing the internal pipe 2 to pass therethrough.

  Moreover, the 1st ductile board | plate material 15a is divided | segmented into two by the cut surface 153 which divides the interior pipe penetration hole 152 into two. This is because, when the distance from the lower end portion of the interior pipe 2 to the installation of the flow shielding portion 14 is long, the divided flow shield is divided rather than inserting the interior pipe 2 into the interior pipe insertion hole 152 to a predetermined position. This is because it is easier in work to directly attach the portion 14 at the installation location.

  In the second embodiment, as shown in FIG. 8, the interior pipe insertion hole 152 is divided into two equal parts and is divided by a longitudinal section passing through the vicinity of one bolt insertion hole 151.

  Moreover, as shown in FIG. 9, the outer peripheral edge part 154 of the 1st ductile board | plate material 15a is formed in the taper shape which diameter-reduces upwards. This is because when the inner pipe 3 is arranged in the outer pipe 2 with the flow shield 14 attached, the upper corner of the outer peripheral edge of the flow shield 14 is inserted into the outer wall of the outer pipe 2 or the like. This is to prevent the output from being hindered.

  The second ductile plate material 15b is provided below the first ductile plate material 15a. As shown in FIGS. 10 and 11, similarly to the first ductile plate material 15 a, there are two bolt insertion holes 151 and an interior pipe insertion hole 152. Further, the inner tube insertion hole 152 is divided into two by a cut surface 153 that divides the inner tube insertion hole 152 into two.

  However, the 2nd ductile board material 15b is divided | segmented by the cut surface 153 in the position different from the cut surface 153 of the 1st ductile board material 15a. This is because when the first ductile plate material 15a and the third ductile plate material 15c are overlapped with each other, a gap is generated in the cut surface 153, and the gaps communicate with each other to prevent water leakage.

  Therefore, the 2nd ductile board material 15b in this 2nd embodiment divides the interior pipe penetration hole 152 into two equal parts, and the cut surface 153 which passes near the bolt penetration hole 151 of the one different from the 1st ductility board material 15a. It is divided by.

  The third ductile plate 15c is provided below the second ductile plate 15b. As shown in FIGS. 12 and 13, two bolt insertion holes 151 and an interior pipe insertion hole 152 are formed. Yes. Further, the inner tube insertion hole 152 is divided into two by a cut surface 153 that divides the inner tube insertion hole 152 into two. The cut surface 153 of the third ductile plate material 15c is cut at a position different from the cut surface 153 of the second ductile plate material 15b described above.

  The fourth ductile plate 15d is attached to the lowermost stage below the third ductile plate 15c. As shown in FIGS. 14 and 15, two bolt insertion holes 151 and an interior pipe insertion hole 152 are formed. Further, the inner tube insertion hole 152 is divided into two by a cut surface 153 that divides the inner tube insertion hole 152 into two. The cut surface 153 of the fourth ductile plate member 15d is cut at a position different from the cut surface 153 of the third ductile plate member 15c.

  Further, as shown in FIG. 15, the outer peripheral edge 154 of the fourth ductile plate member 15 d is prevented from being inserted and removed by the lower corner of the outer peripheral edge of the flow shield 14 being caught by the inner wall of the outer tube 2. In contrast to the outer peripheral edge 154 of the first ductile plate member 15a, the first ductable plate member 15a is formed in a taper shape whose diameter is reduced downward.

  In addition, the number of the ductile plates 15 is not particularly limited, and may be configured by one ductable plate 15.

  The holding member 16 includes an upper holding member 16a and a lower holding member 16b. The ductile plate 15 is extended outward (in the radial direction) by sandwiching the ductile plate 15 from above and below by the upper sandwiching member 16a and the lower sandwiching member 16b.

  As shown in FIGS. 3, 4, 16, and 17, the upper holding member 16 a is inserted through the inner pipe 3 and the two bolt insertion holes 163 through which the bolts 161 provided in the lower holding member 16 b are inserted. And an internal pipe insertion hole 164 to be made. Similarly to the ductile plate 15, the inner pipe insertion hole 164 is divided into two parts by a cut surface 165 that divides the inner pipe insertion hole 164 into two so that the flow shielding portion 14 can be directly attached to the installation place in the inner pipe 3. Has been.

  Further, as shown in FIGS. 3, 4, 18 and 19, the lower holding member 16b has an interior pipe insertion hole 164 and two bolts 161 are fixed upward. Similarly to the upper holding member 16a, the inner pipe insertion hole 164 is divided into two parts by a cut surface 165 that divides the inner pipe insertion hole 164 into two parts so that the inner pipe insertion hole 164 can be directly attached to the installation place of the distribution shielding part 14. Yes. The two bolts 161 adjust the amount by which the ductile plate 15 is extended by adjusting the tightening force of the nut 162.

  The interior pipe 3 in the second embodiment has an opening at the lower end, and a water flow hole 31 for inflowing and outflowing of geothermal water is formed on the side surface below the installation location of the flow shielding unit 14. Yes. Note that a strainer may be separately provided at the lower end portion and the water flow hole 31 in order to prevent foreign matters from entering the interior pipe 3.

  The internal pipe 3 is arranged in the external pipe 2 by installing the flow shielding part 14 in a predetermined place and inserting it into the external pipe 2. At this time, since the outer peripheral edge 154 of the first ductile plate 15a and the fourth ductile plate 15d in the flow shield part 14 is formed in a tapered shape, it can be quickly installed.

  In addition, the flow of geothermal water in the first mode and the second mode in the second embodiment is the same as the flow in the first embodiment described above, and the operation of each configuration associated therewith is also equivalent.

  As described above, according to the flow path switching type geothermal water circulating apparatus 1B of the second embodiment, by inserting the inner pipe 3 into the outer pipe 2 having a plurality of strainers above and below and arranging the flow shielding portion 14. The flow path switching type geothermal water circulation device 1B can be configured easily. That is, an existing well or the like can be used as the outer tube 2 and can be easily put to practical use without excavating a well for the outer tube 2 separately.

  Even if a well becomes unusable due to clogging of the strainer, the clogging of the strainer can be eliminated and the well can be regenerated by appropriately switching the circulation direction of the geothermal water.

DESCRIPTION OF SYMBOLS 1 Flow-path-switching type geothermal water circulation apparatus 2 Exterior pipe 3 Interior pipe 4 Upper strainer 5 Lower strainer 6 Outflow prevention part 7 Air shut off part 8 Exterior pipe pump 9 Interior pipe pump 10 Heat exchange means 11 Exterior pipe reduction pipe 12 Interior pipe reduction pipe 13 Mode switching means 14 Flow shielding part 15 Ductile plate material 16 Nipping member 111 Outlet 121 Outlet 131 Reduction pipe switching control part 15a 1st ductile plate material 15b 2nd ductile plate material 15c 3rd ductile plate material 15d 4th possible Ductile plate 151 Bolt insertion hole 152 Internal pipe insertion hole 153 Cutting surface 154 Outer peripheral edge portion 16a Upper holding member 16b Lower holding member 161 Bolt 162 Nut 163 Bolt insertion hole 164 Internal pipe insertion hole 165 Cutting surface 31 Flow hole 61 Inner tube Insertion hole L Aquifer UL Upper aquifer LL Lower aquifer W Water Place

  The present invention relates to a flow path switching type geothermal water circulation device that circulates and uses geothermal water in an aquifer.

  Generally, the underground temperature is almost constant throughout the year. Therefore, the underground in summer tends to be lower than the outside temperature, and the underground in winter tends to be higher than the outside temperature. Moreover, since the temperature of the geothermal water contained in the underground aquifer depends on the temperature of the ground, there is a tendency similar to the above.

  Therefore, attempts have been made so far to draw up geothermal water in the aquifer and use it as a heat source for cooling in the summer and as a heat source for heating in the winter.

  For example, in the patent No. 3927593, the inventor of the present application disclosed an outer tube having a strainer, a heat insulating inner tube inserted into the outer tube, and a flow passage formed between the heat insulating inner tube and the outer tube. A pump for pumping geothermal water from inside the heat insulation interior pipe, a heat source supply pump pipe for pumping the geothermal water pumped by the pump, and a heat source reduction pipe for pumping the geothermal water after being used to the flow passage Has proposed a double-pipe geothermal water circulation device with a patent right (Patent Document 1). According to this patent document 1, since geothermal water after use is reduced to an aquifer through a strainer, it is said that there is no concern about well drainage or ground subsidence due to excessive sampling.

  However, in the invention described in Patent Document 1, foreign matters such as mud and sand when the geothermal water is filtered are deposited on the aquifer side of the strainer, which may cause clogging. Moreover, when clogging arises, it is thought that it is difficult to eliminate this.

  Therefore, the present inventor, in Japanese Patent No. 4564106, an exterior tube, an interior tube disposed in the exterior tube, a geothermal water suction pump disposed in the interior tube, a strainer provided in the exterior tube, Suction of geothermal water in the upper and lower flow passages formed by closing the flow passage formed between the outer pipe and the inner pipe so as to be divided vertically, and geothermal water in the lower flow passage The first circulation mode that sucks in the pump and reduces the geothermal water after use from the upper flow path to the aquifer, and the geothermal water in the upper flow path is sucked in by the geothermal water suction pump, A flow path switching type having a second circulation mode for reducing geothermal water from the lower flow passage to the aquifer, and mode switching means for switching between the first circulation mode or the second circulation mode. Proposed geothermal water circulation device and obtained a patent ( Patent Document 2). According to this Patent Document 2, by appropriately switching between the first circulation mode and the second circulation mode, it is possible to cause the action of causing foreign matter accumulated on the aquifer side of the strainer to flow out to the aquifer side. It is said that clogging can be prevented.

Japanese Patent No. 3927593 Japanese Patent No. 4564106

  However, in the invention described in Patent Document 2, the geothermal water suction pump is installed only in the interior pipe, and the geothermal water to be pumped is always supplied into the interior pipe. To switch between the circulation modes, a complicated flow path is required. Therefore, since the manufacturing cost is increased, there has been a need to simplify the structure and to reduce the manufacturing cost and increase the practical use.

  Moreover, in the invention described in Patent Document 2, it is necessary to previously provide a structure for dividing the flow passage vertically in an outer tube or the like. For example, Patent Document 2 proposes a configuration that includes a support portion in an outer tube and a locking portion of the inner tube, or that fixes the outer tube and the inner tube with a partition or the like.

  However, what has been proposed in Patent Document 2 is a factor that increases the installation cost because it is necessary to newly manufacture and bury the outer tube having the above-described configuration. Therefore, if an existing well can be used as an outer tube, the installation cost can be reduced.

  The present invention has been made in order to meet such needs, and it is possible to reduce the manufacturing cost by simplifying the structure and to reduce the installation cost by using an existing well. The object is to provide a switchable geothermal water circulation device.

The reference example of the flow path switching type geothermal water circulation device according to the present invention includes an outer tube buried from the surface to a depth having at least one aquifer, and a band disposed in the outer tube and in contact with at least the outer tube. An inner pipe embedded to a position deeper than the water layer, an upper strainer provided at a position in contact with the aquifer in the outer pipe, a lower strainer provided at a position in contact with the aquifer in the inner pipe, An outflow prevention part formed between the aquifer in contact with the outer tube and the aquifer in contact with the inner tube and configured to prevent the outflow of geothermal water flowing in from the upper strainer. A pump for an outer tube that is disposed between the inner tube and the outer tube and pumps up geothermal water flowing into the outer tube, and a ground that is disposed in the inner tube and flows into the inner tube A pump for an interior pipe that pumps water, a heat exchange means for exchanging heat using the geothermal water pumped by the pump for the exterior pipe or the pump for the interior pipe, and the geothermal water after being used by the heat exchange means And operating a reduction pipe for an exterior pipe that returns to the inside of the exterior pipe, a reduction pipe for an interior pipe that reduces the geothermal water that has been used by the heat exchange means to the inside of the interior pipe, and a pump for the exterior pipe. Mode switching means for switching between a first mode for opening the internal pipe reduction pipe and a second mode for operating the internal pipe pump and opening the external pipe reduction pipe.

Further, the flow path switching type geothermal water circulation device according to the present invention includes an outer tube buried from the ground surface to a depth having at least a plurality of aquifers, and at least one deeper position than the aquifer in the outer tube. An inner pipe to be inserted, and an upper aquifer layer on the upper side and a lower aquifer layer on the lower side of the plurality of aquifers, inserted into the outer pipe in a state of being attached to the inner pipe. A flow shielding portion that shields upper and lower flow in the outer tube by being disposed between, an upper strainer provided at a position in contact with the upper aquifer layer in the outer tube, and the lower aquifer layer in the outer tube A lower strainer provided at a position in contact with the outer tube, a pump for an outer tube disposed between the inner tube and the outer tube above the flow shield, and pumping up geothermal water flowing into the outer tube, and the inner tube Heat exchange means for exchanging heat with the pump interior tube pumping geothermal water flowing into the interior pipe is disposed, a geothermal water pumped up by the outer tube pump or the interior tube pump as a heat source in the heat wherein the exchange means disposed over the outer tube, the reducing pipe sheathing tube geothermal water is reduced to the outer tube after being used by said heat exchange means is disposed toward the interior pipe from the heat exchange means, wherein a reducing pipe interior tube geothermal water is reduced to the interior tube after being used by said heat exchange means, a first mode for opening the reducing pipe for the interior tube actuates the pump for the outer tube interior Mode switching means for operating a pipe pump and switching to a second mode for opening the outer pipe reduction pipe.

  Further, as one aspect of the present invention, the outlet of the outer pipe reducing pipe and the outlet of the inner pipe reducing pipe are arranged at a position deeper than the dynamic water level, and a position deeper than the dynamic water level in the outer pipe and the inner pipe. In addition, an air blocking unit that blocks contact between the geothermal water and air may be installed.

  Furthermore, as one aspect of the present invention, the flow shield part includes a ductable plate material having an interior tube insertion hole through which the interior tube is inserted, and an outer peripheral edge of the ductile plate material by sandwiching the ductile plate material from above and below. It is also possible to have a pinching member that closely contacts the inner wall of the outer tube.

  Further, as one aspect of the present invention, the flow shield part has a plurality of the ductile plate members, and each of the ductile plate members is divided into two by a cut surface that divides the interior pipe insertion hole. In addition, the cut surfaces of the ductile plates that are in contact with each other may be overlapped while being shifted in the circumferential direction.

  According to the present invention, the manufacturing cost can be reduced by simplifying the structure, and the installation cost can be reduced by using an existing well.

It is a front longitudinal cross-sectional view which shows the 1st mode in the reference example of the flow-path-switching-type geothermal water circulation apparatus which concerns on this invention. It is a front longitudinal cross-sectional view which shows the 2nd mode in the reference example of the flow-path-switching type geothermal water circulation apparatus which concerns on this invention. It is a front longitudinal cross-sectional view which shows the 1st mode in one Embodiment of the flow-path switching type geothermal water circulation apparatus which concerns on this invention. It is a front longitudinal cross-sectional view which shows the 2nd mode in one Embodiment of the flow-path switching type geothermal water circulation apparatus which concerns on this invention. It is a front view which shows the distribution | circulation shielding part in this embodiment . It is a top view which shows the distribution | circulation shielding part in this embodiment . It is a left view of FIG. 5 which shows the distribution | circulation shielding part in this embodiment . It is a top view which shows the 1st ductile board | plate material in this embodiment . It is a front view which shows the 1st ductile board | plate material in this embodiment . It is a top view which shows the 2nd ductile board | plate material in this embodiment . It is a front view which shows the 2nd ductile board | plate material in this embodiment . It is a top view which shows the 3rd ductile board | plate material in this embodiment . It is a front view which shows the 3rd ductile board | plate material in this embodiment . It is a top view which shows the 4th ductile board | plate material in this embodiment . It is a front view which shows the 4th ductile board | plate material in this embodiment . It is a top view which shows the upper pinching member in this embodiment . It is a front view which shows the upper pinching member in this embodiment . It is a top view which shows the lower pinching member in this embodiment . It is a front view which shows the lower holding member in this embodiment .

Hereinafter, a reference example of a flow path switching type geothermal water circulating apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a front longitudinal sectional view showing a state of the first mode in the flow path switching type geothermal water circulating apparatus 1A of the present reference example .

From FIG. 1, the flow path switching type geothermal water circulation device 1 </ b> A of the present reference example mainly includes an outer tube 2 embedded in the ground, an inner tube 3 disposed in the outer tube 2, and the outer tube 2. The upper strainer 4 provided on the side surface, the lower strainer 5 provided on the side surface of the interior pipe 3, the outflow prevention part 6 configured as a bottom provided below the exterior pipe 2, the exterior pipe 2 and the interior An air blocking portion 7 provided near the ground surface of the pipe 3, an outer pipe pump 8 disposed in the outer pipe 2, an inner pipe pump 9 disposed in the inner pipe 3, and geothermal water to be pumped Heat exchanging means 10 for exchanging heat as a heat source, a reduction pipe 11 for the outer pipe that reduces the geothermal water after use into the outer pipe 2, and an interior that reduces the geothermal water after use into the inner pipe 3 The pipe reduction pipe 12 and the geothermal water flow first And a mode switching means 13 for switching the over-de or the second mode. Hereinafter, each configuration will be described in detail.

  The outer tube 2 is a tube made of steel, resin, or the like, and is buried from the ground surface to a depth having at least one aquifer L in the ground having a plurality of aquifers L.

  The inner pipe 3 is a pipe made of steel, resin, or the like. The inner pipe 3 is disposed in the outer pipe 2 and has a deep aquifer L at a position deeper than at least the aquifer L in contact with the outer pipe 2. It is buried. Further, the inner tube 3 is disposed at a position eccentric from the center position of the outer tube 2 in order to dispose the outer tube pump 8 between the inner tube 3 and the outer tube 2. In addition, when the space sufficient to arrange | position the pump 8 for exterior pipes is formed between the exterior pipe 2 and the interior pipe 3, it is not necessary to arrange the interior pipe 3 in the eccentric position with respect to the exterior pipe 2 Good.

  The upper strainer 4 has a filter constituted by small gravel filled in a gap formed between the underground excavated for inserting the outer tube 2 and the outer tube 2. It is provided at a position in contact with the second aquifer L. The upper strainer 4 is for removing impurities such as sand and mud contained in the geothermal water flowing into the outer tube 2. Note that the filter of the upper strainer 4 may be formed of a wire mesh, a nonwoven fabric, or the like.

  Similar to the upper strainer 4, the lower strainer 5 has a filter constituted by small gravel filled in a gap formed between the underground excavated for inserting the inner pipe 3 and the inner pipe 3. And it is provided in the position of the aquifer L where the interior pipe 3 is in contact below the outflow prevention section 6 which is the bottom of the exterior pipe 2. Similar to the upper strainer 4, the lower strainer 5 removes impurities such as sand and mud contained in the geothermal water flowing into the interior pipe 3. Note that the filter of the lower strainer 5 may be formed of a wire mesh, a nonwoven fabric, or the like.

The outflow prevention unit 6 serves to block the lower portion of the outer tube 2 and functions in this reference example so that the geothermal water introduced from the upper strainer 4 does not flow out. The outflow prevention part 6 is formed with an interior pipe insertion hole 61 for allowing the interior pipe 3 to be inserted therethrough. The outflow prevention portion 6 may be formed integrally with the outer tube 2 and is formed as a separate body from the outer tube 2 and fixed below the outer tube 2 by welding, fitting, screwing or the like. May be.

  The air blocking part 7 is made of a plate-like member made of steel, resin, or the like, and is disposed at a position deeper than the moving water level W above the outer tube 2 and the inner tube 3. The air blocking section 7 blocks contact between the geothermal water in the outer tube 2 and the inner tube 3 and the air above it.

  The dynamic water level W is the level of geothermal water in each pipe when the outer pipe pump 8 or the inner pipe pump 9 is operated.

The outer tube pump 8 is a pump for pumping up geothermal water in the outer tube 2, and is disposed between the inner tube 3 and the outer tube 2. In addition, the outer tube pump 8 in the present reference example uses a submersible pump that can pump geothermal water from underwater in order to avoid contact between the geothermal water pumped up and air.

The internal pipe pump 9 is a pump for pumping up the geothermal water in the internal pipe 3, and is disposed in the internal pipe 3. In addition, as the internal pipe pump 9 in this reference example , a submersible pump is used in order to avoid contact between the geothermal water to be pumped and the air, similarly to the external pipe pump 8.

  The exterior tube pump 8 and the interior tube pump 9 are not limited to submersible pumps. For example, a pump that cannot be used in water can be used. In the case of a pump that cannot be used underwater, the intake port of the pump is arranged at a position deeper than the dynamic water level W in the outer tube 8 or the inner tube 9, and the pump main body is provided in the ground or on the ground, so that the outer tube 2 The geothermal water in the interior or interior pipe 3 can be pumped up.

  The heat exchanging means 10 is composed of an air conditioner or the like that performs heat exchange using geothermal water as a heat source. In addition, instead of the heat exchange means 10 or together with the heat exchange means 10, a faucet may be provided so that geothermal water can be used as a water source.

The outer pipe reduction pipe 11 is a pipe made of steel, resin, or the like, and is arranged from the heat exchange means 10 to the outer pipe 2. The outer pipe reducing pipe 11 is a pipe that reduces the geothermal water after being used by the heat exchange means 10 into the outer pipe 2. Further, the outlet 111 at the lower end of the outer pipe reduction pipe 11 in the present reference example is disposed at a position deeper than the dynamic water level W. This is to avoid contact between the geothermal water and the air when the geothermal water after use is reduced into the outer tube 2.

The interior pipe reduction pipe 12 is a pipe made of steel, resin, or the like, and is arranged from the heat exchange means 10 to the interior pipe 3. The interior pipe reduction pipe 12 is a pipe that reduces the geothermal water after being used by the heat exchange means 10 into the interior pipe 3. In addition, the outlet 121 at the lower end of the inner pipe reduction pipe 12 in this reference example is similar to the outlet 111 at the lower end of the outer pipe reduction pipe 11 in order to avoid contact between geothermal water and air. It is arranged at a position deeper than the water level W.

The mode switching means 13 switches between a first mode in which the exterior pipe pump 8 is operated and the interior pipe reduction pipe 12 is opened, and a second mode in which the interior pipe pump 9 is operated and the exterior pipe reduction pipe 11 is opened. Thus, the circulation direction of the geothermal water is switched. The mode switching means 13 in the present reference example has a pump control unit (not shown) and a reduction pipe switching control unit 131 for switching between the first mode and the second mode.

  The pump control unit performs on / off control of the operation of the outer tube pump 8 and the inner tube pump 9, and in the first mode, the outer tube pump 8 is operated and the inner tube pump 9 is stopped, In the second mode, the inner tube pump 9 is operated and the outer tube pump 8 is stopped.

  The reduction pipe switching control unit 131 has an electromagnetic valve or the like, and performs control to switch the flow path for sending geothermal water after use to the exterior pipe reduction pipe 11 or the interior pipe reduction pipe 12. In the first mode, the flow path on the inner pipe return pipe 12 side is opened, and in the second mode, the flow path on the outer pipe return pipe 11 side is opened.

Next, the operation of each component of the flow path switching type geothermal water circulation device 1A in this reference example will be described with reference to FIGS.

  First, a case where each configuration is the first mode will be described. As shown in FIG. 1, in the first mode, the pump control unit of the mode switching unit 13 operates the outer tube pump 8 and stops the inner tube pump 9.

The outer tube pump 8 pumps up the geothermal water in the outer tube 2 and sends it to the heat exchange means 10. In this reference example , since the submersible pump is used as the outer tube pump 8, the pumped geothermal water can be sent to the heat exchanging means 10 without contacting with air.

  In the outer tube 2, when geothermal water is pumped and the water level is lowered, the pressure in the outer tube 2 is also lowered accordingly. Therefore, the pressure on the aquifer L side becomes relatively high, and the geothermal water in the aquifer L passes through the upper strainer 4 and flows into the outer tube 2. As described above, the geothermal water in the outer tube 2 is supplied from the aquifer L as needed and can be continuously pumped by the outer tube pump 8.

  Further, since the outflow prevention part 6 blocks the lower part of the outer tube 2, geothermal water that passes through the upper strainer 4 and flows into the outer tube 2 can be stored in the outer tube 2.

  The upper strainer 4 filters foreign matters such as mud and sand contained in the aquifer L by a filter and cleans the geothermal water flowing into the outer tube 2.

  The heat exchange means 10 performs heat exchange using the pumped geothermal water as a heat source. For example, since the geothermal water is cooler than the outside air temperature in summer, the geothermal water is used as a heat source for cooling. In the winter season, geothermal water is hotter than the outside air temperature, so geothermal water is used as a heat source for heating.

  The reduction pipe switching control unit 131 of the mode switching means 13 controls the electromagnetic valve to open the interior pipe reduction pipe 11 with the flow path for sending the geothermal water after being used as the interior pipe reduction pipe 12 side.

  And the geothermal water after being used by the heat exchange means 10 in the first mode is sent into the interior pipe 3. At this time, since the outlet 121 of the internal pipe return pipe 12 is disposed at a position deeper than the dynamic water level W, geothermal water can be sent into the internal pipe 3 without contacting air.

  Moreover, when the geothermal water is sent into the interior pipe 3, the pressure in the interior pipe 3 is increased. Accordingly, the pressure on the aquifer L side becomes relatively low, and the geothermal water in the interior pipe 3 passes through the lower strainer 5 and is reduced to the aquifer L.

  Next, a case where each configuration is the second mode will be described. As shown in FIG. 2, in the second mode, the pump control unit of the mode switching unit 13 operates the internal pipe pump 9 and stops the external pipe pump 8. This is because the geothermal water is circulated in the direction opposite to the circulation direction in the first mode.

  The interior pipe pump 9 pumps up the geothermal water in the interior pipe 3 and sends it to the heat exchange means 10. Since the submersible pump is used like the outer tube pump 8, the pumped geothermal water can be sent to the heat exchanging means 10 without contacting with air.

  As the geothermal water in the interior pipe 3 is pumped up, the water level is lowered and the pressure in the interior pipe 3 is lowered. Accordingly, the pressure on the aquifer L side becomes relatively high, and the geothermal water in the aquifer L passes through the lower strainer 5 and flows into the interior pipe 3 as needed.

  Similar to the upper strainer 4, the lower strainer 5 filters foreign matters such as mud and sand contained in the aquifer L by a filter and cleans the geothermal water flowing into the interior pipe 3.

  Similarly to the first mode, the heat exchange means 10 performs heat exchange using the pumped geothermal water as a heat source.

  In the second mode, the reduction pipe switching control unit 131 of the mode switching means 13 controls the solenoid valve to switch the flow path for sending the geothermal water after use to the exterior pipe reduction pipe 11 side, and to reduce the exterior pipe reduction. The pipe 11 is opened.

  Moreover, since the outflow port 111 of the reduction pipe 11 for exterior pipes is arrange | positioned in the position deeper than the dynamic water level W similarly to the outflow port 121 of the reduction pipe 12 for interior pipes, without making geothermal water contact air. It can be sent into the outer tube 2. The outflow prevention unit 6 prevents outflow of geothermal water sent into the outer tube 2 from the outer tube 2.

  And when geothermal water is sent in the exterior pipe 2, the pressure in the exterior pipe 2 becomes high. Therefore, the pressure on the aquifer L side becomes relatively low, and the geothermal water in the outer tube 2 passes through the upper strainer 4 and is reduced to the aquifer L.

In both the first mode and the second mode, the air blocking unit 7 blocks the contact between the geothermal water in the outer tube 2 and the inner tube 3 and the air above it. Therefore, the flow path switching type geothermal water circulation device 1A of the present reference example can circulate the geothermal water without contacting the air.

  On the other hand, foreign matter such as sand filtered by the upper strainer 4 or the lower strainer 5 adheres or accumulates on the aquifer L side that is outside the upper strainer 4 or the lower strainer 5. Therefore, if the use is continued in the same mode for a long time, the aquifer L side may be clogged.

Therefore, in this reference example , the mode switching unit 13 switches the mode to prevent the upper strainer 4 or the lower strainer 5 from being clogged.

  For example, in the first mode, foreign matter such as sand filtered by the upper strainer 4 is deposited on the aquifer L side of the upper strainer 4. Therefore, when the mode is switched to the second mode, as described above, in the second mode, the pressure in the outer tube 2 becomes higher, and the pressure on the aquifer L side becomes relatively lower. It passes through the strainer 4 and is reduced to the aquifer L. At this time, since foreign matters such as sand accumulated on the aquifer L side of the upper strainer 4 are pushed away to the aquifer L side, clogging can be eliminated.

  Similarly, in the second mode, foreign matters such as sand filtered by the lower strainer 5 are deposited on the aquifer L side of the lower strainer 5. Therefore, when the mode is switched to the first mode, the geothermal water in the interior pipe 3 passes through the lower strainer 5 and is reduced to the aquifer L, so that it accumulates on the aquifer L side of the lower strainer 5. Foreign matter such as sand is pushed away toward the aquifer L and clogging is eliminated.

  Therefore, clogging can be prevented by switching the mode as appropriate. Note that the timing for switching the mode is appropriately selected. Since the underground temperature is almost constant throughout the year, it is possible to continuously supply geothermal water having the same temperature whenever the mode is switched.

  The underground temperature is colder in summer and warmer in winter than the outside temperature. Accordingly, geothermal water is suitable as a heat source for cooling in summer and as a heat source for heating in winter, and the temperature of geothermal water can be efficiently used as a heat source throughout the year.

  In addition, since the used water can be reduced to each aquifer L by appropriately switching between the first mode and the second mode, it is possible to prevent the aquifer L from being depleted and The applied load can be reduced.

According to the flow path switching type geothermal water circulating apparatus 1A of the present reference example as described above, the following effects can be obtained.
1. By arranging the pump for pumping up the geothermal water in both the outer pipe 2 and the inner pipe 3, the structure of the flow passage for circulating the geothermal water can be simplified.
2. Geothermal water can be circulated without contact with air. Therefore, generation | occurrence | production of the algae etc. in the flow-path switching type geothermal water circulation apparatus 1A can be suppressed.
3. The basic performance of the flow path switching type geothermal water circulating apparatus 1A for preventing the strainer from being clogged can be maintained without replacing the strainer.
4). By recycling geothermal water, we can provide a friendly system that is environmentally friendly.

It will now be described with reference to the accompanying drawings, an embodiment of a flow path switching type geothermal water circulating apparatus according to the present invention. Note that, in the configuration of the present embodiment , the same or equivalent configuration as the configuration of the reference example described above is denoted by the same reference numeral, and the description thereof is omitted.

FIG. 3 is a front longitudinal sectional view showing a state of the first mode in the flow path switching type geothermal water circulating apparatus 1B of the present embodiment .

From FIG. 3, the flow path switching type geothermal water circulating apparatus 1B of the present embodiment is mainly composed of the outer tube 2, the inner tube 3, the upper strainer 4, the lower strainer 5, the air blocking unit 7, and the outer tube pump 8. And an internal pipe pump 9, a heat exchange means 10, an external pipe reduction pipe 11, an internal pipe reduction pipe 12, and a mode switching means 13, which are configured at the bottom of the external pipe 2 in the reference example . Instead of the outflow prevention unit 6, a distribution shielding unit 14 is provided.

As shown in FIG. 3, the outer tube 2 in the present embodiment is embedded from the ground surface to a depth having a plurality of aquifers L. The outer tube 2 is provided with a strainer at a position in contact with the aquifer L.

The distribution shielding unit 14 is installed at an arbitrary depth in the outer tube 2 and shields the upper and lower distribution in the outer tube 2. That is, the flow blocking unit 14 is configured to correspond to the outflow preventing section 6 of the outer tube 2 in the reference example, but to have a function corresponding exterior tube 2 below the flow blocking unit 14 on the interior tube 3 in Reference Example is there.

Therefore, in the present embodiment , the strainer of the outer tube 2 provided in the upper aquifer UL above the circulation shield 14 becomes the upper strainer 4, and the lower aquifer LL below the circulation shield 14. The strainer provided in the lower part becomes the lower strainer 5.

As shown in FIGS. 5 to 7, the flow shielding portion 14 in the present embodiment includes a ductable plate member 15 and a pinching member 16 that sandwiches the ductile plate member 15. Hereinafter, the ductile plate material 15 and the holding member 16 will be described in detail.

The ductile plate 15 is extended in the outer direction (radial direction) by being held by the holding member 16, and the outer peripheral edge thereof is in close contact with the inner wall of the outer tube 2, so that the upper and lower flow in the outer tube 2 is distributed. Is to shield. As shown in FIGS. 8 to 15, the ductile plate material 15 in the present embodiment includes a first ductile plate material 15 a, a second ductile plate material 15 b, a third ductile plate material 15 c, and a fourth ductile plate material 15 d.

  The first ductile plate material 15a is the uppermost ductile plate material 15 and, as shown in FIGS. 8 and 9, two bolt insertion holes 151 through which the bolts 161 provided in the holding member 16 are inserted. And an internal pipe insertion hole 152 for allowing the internal pipe 2 to pass therethrough.

  Moreover, the 1st ductile board | plate material 15a is divided | segmented into two by the cut surface 153 which divides the interior pipe penetration hole 152 into two. This is because, when the distance from the lower end portion of the interior pipe 2 to the installation of the flow shielding portion 14 is long, the divided flow shield is divided rather than inserting the interior pipe 2 into the interior pipe insertion hole 152 to a predetermined position. This is because it is easier in work to directly attach the portion 14 at the installation location.

In the present embodiment , as shown in FIG. 8, the interior pipe insertion hole 152 is divided into two equal parts and is divided by a longitudinal section passing through the vicinity of one bolt insertion hole 151.

  Moreover, as shown in FIG. 9, the outer peripheral edge part 154 of the 1st ductile board | plate material 15a is formed in the taper shape which diameter-reduces upwards. This is because when the inner pipe 3 is arranged in the outer pipe 2 with the flow shield 14 attached, the upper corner of the outer peripheral edge of the flow shield 14 is inserted into the outer wall of the outer pipe 2 or the like. This is to prevent the output from being hindered.

  The second ductile plate material 15b is provided below the first ductile plate material 15a. As shown in FIGS. 10 and 11, similarly to the first ductile plate material 15 a, there are two bolt insertion holes 151 and an interior pipe insertion hole 152. Further, the inner tube insertion hole 152 is divided into two by a cut surface 153 that divides the inner tube insertion hole 152 into two.

  However, the 2nd ductile board material 15b is divided | segmented by the cut surface 153 in the position different from the cut surface 153 of the 1st ductile board material 15a. This is because when the first ductile plate material 15a and the third ductile plate material 15c are overlapped with each other, a gap is generated in the cut surface 153, and the gaps communicate with each other to prevent water leakage.

Therefore, the 2nd ductile board material 15b in this embodiment divides the interior pipe penetration hole 152 into two equal parts, and is divided by cutting surface 153 which passes near the bolt penetration hole 151 which is different from the 1st ductility board material 15a. Has been.

  The third ductile plate 15c is provided below the second ductile plate 15b. As shown in FIGS. 12 and 13, two bolt insertion holes 151 and an interior pipe insertion hole 152 are formed. Yes. Further, the inner tube insertion hole 152 is divided into two by a cut surface 153 that divides the inner tube insertion hole 152 into two. The cut surface 153 of the third ductile plate material 15c is cut at a position different from the cut surface 153 of the second ductile plate material 15b described above.

  The fourth ductile plate 15d is attached to the lowermost stage below the third ductile plate 15c. As shown in FIGS. 14 and 15, two bolt insertion holes 151 and an interior pipe insertion hole 152 are formed. Further, the inner tube insertion hole 152 is divided into two by a cut surface 153 that divides the inner tube insertion hole 152 into two. The cut surface 153 of the fourth ductile plate member 15d is cut at a position different from the cut surface 153 of the third ductile plate member 15c.

  Further, as shown in FIG. 15, the outer peripheral edge 154 of the fourth ductile plate member 15 d is prevented from being inserted and removed by the lower corner of the outer peripheral edge of the flow shield 14 being caught by the inner wall of the outer tube 2. In contrast to the outer peripheral edge 154 of the first ductile plate member 15a, the first ductable plate member 15a is formed in a taper shape whose diameter is reduced downward.

  In addition, the number of the ductile plates 15 is not particularly limited, and may be configured by one ductable plate 15.

  The holding member 16 includes an upper holding member 16a and a lower holding member 16b. The ductile plate 15 is extended outward (in the radial direction) by sandwiching the ductile plate 15 from above and below by the upper sandwiching member 16a and the lower sandwiching member 16b.

  As shown in FIGS. 3, 4, 16, and 17, the upper holding member 16 a is inserted through the inner pipe 3 and the two bolt insertion holes 163 through which the bolts 161 provided in the lower holding member 16 b are inserted. And an internal pipe insertion hole 164 to be made. Similarly to the ductile plate 15, the inner pipe insertion hole 164 is divided into two parts by a cut surface 165 that divides the inner pipe insertion hole 164 into two so that the flow shielding portion 14 can be directly attached to the installation place in the inner pipe 3. Has been.

  Further, as shown in FIGS. 3, 4, 18 and 19, the lower holding member 16b has an interior pipe insertion hole 164 and two bolts 161 are fixed upward. Similarly to the upper holding member 16a, the inner pipe insertion hole 164 is divided into two parts by a cut surface 165 that divides the inner pipe insertion hole 164 into two parts so that the inner pipe insertion hole 164 can be directly attached to the installation place of the distribution shielding part 14. Yes. The two bolts 161 adjust the amount by which the ductile plate 15 is extended by adjusting the tightening force of the nut 162.

The interior pipe 3 in the present embodiment has an opening at the lower end, and a water flow hole 31 for allowing the geothermal water to flow in and out is formed on the side surface below the installation location of the flow shielding part 14. Note that a strainer may be separately provided at the lower end portion and the water flow hole 31 in order to prevent foreign matters from entering the interior pipe 3.

  The internal pipe 3 is arranged in the external pipe 2 by installing the flow shielding part 14 in a predetermined place and inserting it into the external pipe 2. At this time, since the outer peripheral edge 154 of the first ductile plate 15a and the fourth ductile plate 15d in the flow shield part 14 is formed in a tapered shape, it can be quickly installed.

In addition, the flow of the geothermal water in the first mode and the second mode in the present embodiment is the same as the flow in the reference example described above, and the operation of each component associated therewith is also equivalent.

As described above, according to the flow path switching type geothermal water circulation device 1B of the present embodiment, the inner pipe 3 is inserted into the outer pipe 2 having a plurality of strainers above and below, and the flow shielding portion 14 is arranged. The flow path switching type geothermal water circulation device 1B can be configured. That is, an existing well or the like can be used as the outer tube 2 and can be easily put to practical use without excavating a well for the outer tube 2 separately.

  Even if a well becomes unusable due to clogging of the strainer, the clogging of the strainer can be eliminated and the well can be regenerated by appropriately switching the circulation direction of the geothermal water.

DESCRIPTION OF SYMBOLS 1 Flow-path-switching type geothermal water circulation apparatus 2 Exterior pipe 3 Interior pipe 4 Upper strainer 5 Lower strainer 6 Outflow prevention part 7 Air shut off part 8 Exterior pipe pump 9 Interior pipe pump 10 Heat exchange means 11 Exterior pipe reduction pipe 12 Interior pipe reduction pipe 13 Mode switching means 14 Flow shielding part 15 Ductile plate material 16 Nipping member 111 Outlet 121 Outlet 131 Reduction pipe switching control part 15a 1st ductile plate material 15b 2nd ductile plate material 15c 3rd ductile plate material 15d 4th possible Ductile plate 151 Bolt insertion hole 152 Internal pipe insertion hole 153 Cutting surface 154 Outer peripheral edge portion 16a Upper holding member 16b Lower holding member 161 Bolt 162 Nut 163 Bolt insertion hole 164 Internal pipe insertion hole 165 Cutting surface 31 Flow hole 61 Inner tube Insertion hole L Aquifer UL Upper aquifer LL Lower aquifer W Water Place

Claims (4)

An outer tube buried from the surface to a depth having at least a plurality of aquifers;
An inner pipe inserted into the outer pipe to a position deeper than at least one of the aquifers;
By being inserted into the outer tube in a state of being attached to the inner pipe and being disposed between the upper aquifer on the upper side and the lower aquifer on the lower side among the plurality of aquifers. A flow shielding portion for shielding the upper and lower flow in the outer tube;
An upper strainer provided at a position in contact with the upper aquifer in the outer tube;
A lower strainer provided at a position in contact with the lower aquifer in the outer tube;
A pump for an outer tube that is disposed between the inner tube and the outer tube above the flow shield and pumps up geothermal water flowing into the outer tube;
An internal pipe pump that pumps up geothermal water that is arranged in the internal pipe and flows into the internal pipe;
Heat exchanging means for exchanging heat using geothermal water pumped up by the outer tube pump or the inner tube pump as a heat source;
A reducing pipe for an outer tube that reduces geothermal water after being used by the heat exchange means into the outer tube;
A reduction pipe for an interior pipe that reduces geothermal water after being used by the heat exchange means into the interior pipe;
Mode switching means for switching between a first mode for operating the exterior pipe pump and opening the interior pipe reduction pipe and a second mode for operating the interior pipe pump and opening the exterior pipe reduction pipe. Channel switching type geothermal water circulation device.   The outlet of the reducing pipe for the outer pipe and the outlet of the reducing pipe for the inner pipe are arranged at a position deeper than the dynamic water level, and the geothermal water and air are deeper than the dynamic water level in the outer pipe and the inner pipe. The flow path switching type geothermal water circulation device according to claim 1, wherein an air blocking part for blocking contact is installed.   The flow shield part includes a ductable plate member having an inner tube insertion hole through which the inner tube is inserted, and a narrow member that holds the ductile plate member from above and below to closely contact the outer peripheral edge of the ductile plate member with the inner wall of the outer tube. The flow path switching type geothermal water circulation device according to claim 1 or 2, further comprising a holding member.   The flow shield part has a plurality of the ductile plate members, and each of the ductile plate members is divided into two by a cut surface that divides the inner tube insertion hole, and is in contact with the upper and lower sides. The flow path switching type geothermal water circulation device according to claim 3, wherein the cut surfaces of the ductile plates are overlapped while being shifted in the circumferential direction.

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