JP4564106B1 - Channel switching type geothermal water circulation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow path switching type geothermal water circulation device capable of preventing strainer clogging.
SOLUTION: The geothermal water of the aquifer L is infiltrated from the geothermal water strainer 3 provided on the lower flow path 6 side by the geothermal water suction pump 7, and the geothermal water is taken in the lower opening for water intake. Circulation control so that it flows into the interior pipe 4 from 42 and is pumped to the ground, uses the geothermal water, and then returns to the aquifer L from the geothermal water strainer 3 provided on the upper flow path 5 side. The geothermal water of the aquifer L is infiltrated from the geothermal water strainer 3 provided on the upper flow passage 5 side by the geothermal water suction pump 7 and the geothermal water is taken in. It flows into the interior pipe 4 from the side opening 43 and is pumped to the ground. After using the geothermal water, the geothermal water strainer 3 provided on the lower flow path 6 side is reduced to the aquifer L. The circulation mode is controlled to the second circulation mode and the first circulation mode or the second circulation mode. And a mode switching means 8 for switching mode.
[Selection] Figure 1

Description

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

  In general, the temperature in the ground is almost constant throughout the year, being lower than the outside temperature in summer and higher than the outside temperature in winter. Thus, attempts have been made to draw up geothermal water contained in the underground 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 Japanese Patent No. 3927593, the inventor forms a flow passage between an outer tube having a strainer for invading or reducing geothermal water from an aquifer and inserted into the outer tube. A heat-insulating interior pipe, a pump for pumping up geothermal water from the inside of the heat-insulated interior pipe, a heat source supply pumping pipe for pumping the geothermal water pumped by the pump to an air conditioner and the like, and geothermal water after being used A double-pipe type geothermal water circulation device having a heat source reduction pipe that is pumped to the flow passage is proposed and patented (Patent Document 1). According to this patent document 1, since the geothermal water after use is reduced to the aquifer through the strainer by the double pipe type geothermal water circulation device, well drainage due to excessive water sampling or ground subsidence It is said that there are no worries.

Japanese Patent No. 3927593

  However, in the invention described in Patent Document 1, there is a possibility that the strainer may be clogged by being used for many years. In that case, the ability to take in geothermal water is lowered, and the heat exchange efficiency is lowered. End up. Since the strainer is buried deep in the ground, if clogging occurs, it is extremely difficult to eliminate the clogging. Therefore, there has been a need for a technique that does not cause clogging in advance.

  The present invention has been made to meet such needs, and an object of the present invention is to provide a flow path switching type geothermal water circulation device that can prevent clogging of a strainer.

  The flow path switching type geothermal water circulation device according to the present invention includes an outer tube buried from the ground surface to the aquifer, an inner tube disposed inside the outer tube, and a geothermal water suction disposed in the inner tube. A flow path switching type geothermal water circulation device having a pump and a geothermal water strainer provided at a boundary between an aquifer in the outer pipe and a flow passage formed between the outer pipe and the inner pipe The geothermal water provided on the side of the lower flow passage of the outer tube by the suction force of the geothermal water suction pump, and the upper flow passage and the lower flow passage formed by closing the upper and lower flow passages. The geothermal water of the aquifer is infiltrated from the strainer, and the geothermal water is introduced into the interior pipe from the lower intake opening that is opened below the interior pipe and is pumped to the ground. After using hot water, the geothermal water A first circulation mode that is circulated and controlled to return to the aquifer from the geothermal water strainer provided on the upper flow passage side, and the upper circulation of the outer tube by the suction force of the geothermal water suction pump The geothermal water of the aquifer is infiltrated from the geothermal water strainer provided on the road side, and the geothermal water is allowed to flow into the interior pipe from the side opening for intake that is opened on the side surface of the interior pipe. After the geothermal water is pumped to the ground and used, the circulation control is performed so that the geothermal water is returned to the aquifer from the geothermal water strainer provided on the lower flow path side of the outer tube. And a mode switching means for switching the circulation mode to the first circulation mode or the second circulation mode.

  That is, the flow path switching type geothermal water circulation apparatus according to the present invention removes deposits adhering to the inside of the geothermal water strainer by the suction force of the geothermal water suction pump, and on the aquifer side of the geothermal water strainer. The adhering deposit is removed by the reducing power of the geothermal water to prevent clogging of the geothermal water strainer, and the mode is switched to the first circulation mode or the second circulation mode. Circulating geothermal water semipermanently by reversing the direction of hot water circulation and alternately performing the removal of deposits by the suction power of the geothermal water suction pump and the removal of sediments by the reduction power of the geothermal water It is possible to make it.

  Further, as one aspect of the present invention, the mode switching means includes a first return path that returns to the upper flow path and a second return path that returns to the interior pipe when reducing after using geothermal water. Return path switching means for switching the return path to any one of the above, and a return path that opens above the intake side opening formed in the interior pipe and functions as an intake for reduction in the second circulation mode An upper opening, a reduction communication path that is communicatively communicated from the upper opening for reduction to the lower flow path, a lower opening opening / closing means for intake that opens and closes the lower opening for intake, and the intake water A side opening for opening and closing means for opening and closing a side opening for water, and an upper opening for opening and closing means for reducing and opening the upper opening for reduction, and the mode switching means changes the circulation mode to the first circulation mode. When switched to The return path switching means switches the geothermal water return path to the first return path, the intake lower opening opening / closing means opens the intake lower opening, the intake side opening opening / closing means and the reduction When the water intake side opening and the reduction upper opening are closed by the upper opening opening / closing means, the circulation path is configured, and when the circulation mode is switched to the second circulation mode by the mode switching means, The return path switching means switches the geothermal water return path to the second return path, the intake lower opening opening / closing means closes the intake lower opening, the intake side opening opening / closing means and the upper return opening A circulation path may be configured by opening the intake side opening and the return upper opening by an opening opening / closing means, respectively.

  Further, as one aspect of the present invention, the lower opening opening / closing means, the water intake side opening opening / closing means, and the reduction upper opening opening / closing means are provided on a circulation mode switching shaft that is pivotally supported so as to move up and down within the interior pipe. Each may be provided on the same axis.

  According to the present invention, clogging of a strainer that takes in geothermal water can be effectively prevented.

It is a longitudinal cross-sectional view which shows the 1st circulation mode in one Embodiment of the flow-path-switching type geothermal water circulation apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows the 2nd circulation mode in one Embodiment of the flow-path switching type geothermal water circulation apparatus which concerns on this invention. It is the front view and longitudinal cross-sectional view which show the interior pipe in this embodiment. It is a cross-sectional view showing a 4A-4A cross section in FIG. It is a cross-sectional view showing a 5A-5A cross section in FIG. It is a cross-sectional view showing a 6A-6A cross section in FIG. It is a front view which shows the circulation mode switching shaft in this embodiment, the on-off valve of the intake lower opening / closing means, the intake side opening / closing means, the geothermal water suction pump, and the upper opening opening / closing means for reduction. FIG. 8 is a transverse cross-sectional view showing a cross section 8A-8A in FIG. 7. It is a cross-sectional view showing a 9A-9A cross section in FIG. It is the front view and longitudinal cross-sectional view which show the switching shaft length adjustment part in this embodiment.

  Hereinafter, an embodiment 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 and FIG. 2 are cross-sectional configuration diagrams showing a flow path switching type geothermal water circulation device 1 of the present embodiment.

  The flow path switching type geothermal water circulation apparatus 1 in the present embodiment mainly includes an outer tube 2, a geothermal water strainer 3, an inner tube 4, an upper flow passage 5, a lower flow passage 6, and geothermal water. It comprises a suction pump 7 and mode switching means 8 for switching between the first circulation mode and the second circulation mode. Hereinafter, each configuration will be described in detail.

  The outer tube 2 is embedded from the ground surface to the aquifer L, and a geothermal water strainer 3 is provided at the boundary with the aquifer L. The outer tube 2 in the present embodiment is an iron tube formed in a bottomless cylindrical shape, and is embedded over a plurality of aquifers L. In addition, the inner pipe 4 is supported at a predetermined position by locking a locking portion 41 provided outside the inner pipe 4 to be described later. A support portion 21 is provided to block the flow passage formed between the upper flow passage 5 and the lower flow passage 6 so as to be divided. A detailed description of the support portion 21 will be described later along with a detailed description of the locking portion 41.

  The geothermal water strainer 3 provided in the outer tube 2 has a filter formed of a wire mesh, a non-woven fabric or the like, and is used for filtering permeated geothermal water. The geothermal water strainer 3 in the present embodiment is disposed on both upper and lower sides with the support portion 21 as a boundary. In addition, since the geothermal water which infiltrates from either the upper or lower geothermal water strainer 3 and the geothermal water which is reduced after use are blocked from flowing through the support portion 21 and the locking portion 41, respectively, The geothermal water will not mix.

  The inner tube 4 is disposed inside the outer tube 2. The inner tube 4 in the present embodiment is formed of a bottomless cylindrical iron tube having an outer diameter smaller than the inner diameter of the outer tube 2, and is locked to the support portion 21 at a predetermined position on the outer surface thereof. An engaging portion 41 is provided. In this embodiment, a lower opening 42 for water intake is formed below the interior pipe 4 and has entered the lower flow passage 6 from the geothermal water strainer 3 in the first circulation mode described later. Geothermal water is allowed to flow into the interior pipe 4.

  The support portion 21 in the present embodiment is formed in a ring shape along the inner peripheral surface of the outer tube 2 having a predetermined height. Further, the locking portion 41 in the present embodiment is formed in a ring shape along the outer peripheral surface having a predetermined height in the interior pipe 2, and is formed in a shape that can be engaged with the support portion 21. Both the support portion 21 and the locking portion 41 have a conical tapered surface whose diameter increases upward, and the inner tube 4 is inserted into the outer tube 2 so that the locking portion 41 and the support portion 21 are inserted. Are engaged with each other, so that the inner tube 4 is arranged at substantially the center of the outer tube 2. Further, the support portion 21 and the locking portion 41 are engaged with each other, thereby blocking the vertical flow of the flow passage to form the upper flow passage 5 and the lower flow passage 6.

  Further, as shown in FIGS. 3 and 4, a water intake side opening 43 that connects the upper flow passage 5 and the interior pipe 4 is formed above the locking part 41 of the interior pipe 4. . The water intake side opening 43 is for allowing the geothermal water that has entered the upper flow passage 5 from the geothermal water strainer 3 to flow into the interior pipe 4 in the second circulation mode described later.

  The structure in which the inner pipe 4 is disposed in the outer pipe 2 is not limited to that by the support portion 21 and the locking portion 41, and a plate-like partition between the inner pipe 4 and the outer tube 2 or the like. May be fixed by welding, or the inner tube 4 and the outer tube 2 may be integrally formed by casting or cutting.

  The geothermal water suction pump 7 is disposed in the interior pipe 4 and removes the deposits adhering to the inside of the geothermal water strainer by suction force, while the geothermal water taken into the interior pipe 4 is grounded. It is pumped up and used for heat exchange by pumping it to the air conditioner 9 or the like. The geothermal water suction pump 7 in this embodiment is fixed to a circulation switching mode shaft 87 described later.

  The mode switching means 8 switches the circulation mode to the first circulation mode or the second circulation mode, and in this embodiment, the return path switching means 81, the return upper opening 82, and the reduction link. A passage 83, a water intake lower opening opening / closing means 84, a water intake side opening opening / closing means 85, a return upper opening opening / closing means 86, and a circulation mode switching shaft 87 are configured.

  In the first circulation mode, as shown in FIG. 1, the geothermal water of the aquifer L from the geothermal water strainer 3 provided on the lower flow path side 6 of the outer tube 2 by the suction force of the geothermal water suction pump 7. The geothermal water flows into the interior pipe from the lower opening 42 for intake water that is opened below the interior pipe 4 and is pumped to the ground. The geothermal water is used by the ground heating and cooling device 9. Thereafter, circulation control is performed so that the geothermal water is returned from the geothermal water strainer 3 provided on the upper flow path side 5 of the outer tube 2 to the aquifer L.

  Further, in the second circulation mode, as shown in FIG. 2, the geothermal heat of the aquifer L from the geothermal water strainer 3 provided on the upper flow path side 5 of the outer tube 2 by the suction force of the geothermal water suction pump 7. While allowing water to enter, the geothermal water flows into the interior pipe from the side opening 43 for intake water that is opened on the side surface of the interior pipe 4 and is pumped to the ground. After use, circulation control is performed so that the geothermal water is returned to the aquifer L from the geothermal water strainer 3 provided on the lower flow path side 6 of the outer tube 2.

  The return path switching means 81 is a return path that returns the geothermal water after use to either the first return path 811 that communicates with the upper flow path 5 or the second return path 812 that communicates with the interior pipe 4. It is comprised by the flow-path switching valve etc. which are switched. That is, as shown in FIGS. 1 and 2, the return path switching means 81 has two outlets for one inflow port, and the outflow destination can be switched to any one of the outflow ports. It is configured. Note that the return path switching means 81 in this embodiment is switched to the first return path 811 in the first circulation mode and switched to the second return path 812 in the second circulation mode.

  The first return path 811 in the present embodiment is a flow path that connects the return path switching means 81 and the upper flow path 5, and the first return path is set by the return path switching means 81 in the first circulation mode. By switching to the return path 81 side, the geothermal water after use is allowed to flow from the cooling / heating device 9 into the upper flow path 5. Further, the lower end of the first return path 811 is adjusted and installed so as to be lower than the water surface W of the geothermal water in the upper flow path 6.

  Further, the second return path 812 in the present embodiment is a flow path that connects the return path switching means 81 and the interior pipe 4. In the second circulation mode, the return path is switched by the return path switching means 81. By switching to the second return path 812 side, the geothermal water after use is allowed to flow from the cooling / heating device 9 into the interior pipe 4. Moreover, the lower end of the 2nd return path 812 is adjusted and installed so that it may become a position lower than the water surface W of the geothermal water in 4 interior pipes.

  As shown in FIGS. 3 and 5, the reduction upper opening 82 is opened above the water intake side opening 43 in the interior pipe 4. The upper opening 82 for reduction communicates with the lower flow passage 6 through the reduction communication passage 83 so as to be able to circulate. In the second circulation mode, the geothermal water after use is circulated from the interior pipe 4 to the lower side. It is designed to be distributed to the road 6.

  In the present embodiment, a cylinder 88 that is slightly larger than the interior pipe 4 is provided from the upper opening 82 for reduction outside the interior pipe 4 to the lower flow passage 6. As shown in FIGS. 2, 3 and 6, it is formed between the cylinder 88 and the inner tube 4.

  The intake lower opening opening / closing means 84 is for opening and closing the intake lower opening 42 arbitrarily. In this embodiment, as shown in FIGS. 1 to 3 and FIG. The on-off valve seat 841 formed on the lower inner peripheral surface and the on-off valve 842 that closely contacts the on-off valve seat 841 in the watertight state in the interior pipe 4 are configured. The on-off valve 842 is fixed to the lower end of a circulation mode switching shaft 87 that moves up and down in the interior pipe 4. In addition, the on-off valve seat 841 and the on-off valve 842 in this embodiment have a conical tapered surface whose diameter is increased upward, and the on-off valve 842 is brought into close contact with the on-off valve seat 841, thereby opening and closing. A valve 842 is arranged at substantially the center of the opening / closing valve seat 841. In the present embodiment, the intake lower opening opening / closing means 84 opens the intake lower opening 42 in the first circulation mode (see FIG. 1), and the intake lower in the second circulation mode. The opening 42 is closed (see FIG. 2).

  The intake side opening / closing means 85 is for opening and closing the intake side opening 43 arbitrarily. As shown in FIGS. 7 and 8, the water intake side surface opening / closing means 85 in the present embodiment is formed by an opening / closing ring 851 having an outer diameter substantially equal to the inner diameter of the inner pipe 4, and the opening / closing valve 842. In the upper position, it is fixed to the circulation mode switching shaft 87 by four support arms 852. In the present embodiment, the intake side opening / closing means 85 closes the intake side opening 43 in the first circulation mode (see FIG. 1), and in the second circulation mode, the intake side surface. The opening 43 is opened (see FIG. 2).

  The reducing upper opening opening / closing means 86 is for opening and closing the reducing upper opening 82. As shown in FIGS. 7 and 9, the reducing upper opening opening / closing means 86 in the present embodiment is formed by an opening / closing ring 861 having an outer diameter substantially equal to the inner diameter of the inner pipe 4, and along the inner pipe. The upper opening 82 for reduction is opened and closed by moving up and down. Further, a water stop plate 862 is provided inside the opening / closing ring 861 of the upper opening opening / closing means 86 for reduction so that geothermal water does not flow. The water stop plate 862 is not limited to the configuration provided in the upper opening opening opening / closing means 86 for reduction, and an arbitrary space between the side opening 43 for intake and the upper opening 82 for reduction. It should just be installed in the position.

  In this embodiment, the upper opening opening / closing means 86 for reduction closes the upper opening 82 for reduction in the first circulation mode (see FIG. 1), and the upper opening for reduction in the second circulation mode. The opening 82 is opened (see FIG. 2).

  As shown in FIGS. 1, 2, and 7, the circulation mode switching shaft 87 links the water intake lower opening / closing means 84, the water intake side opening opening / closing means 85, and the reduction upper opening opening / closing means 86. Thus, the first circulation mode and the second circulation mode are switched. Moreover, in this embodiment, it is comprised so that it may function also as a flow path of the geothermal water pumped by the geothermal water suction pump 7.

  Therefore, the circulation mode switching shaft 87 in this embodiment includes, in order from the bottom, the opening / closing valve 842 of the water intake lower opening / closing means 84, the opening / closing ring 851 of the water intake side opening opening / closing means 85, the geothermal water suction pump 7, and The opening / closing rings 861 of the reducing upper opening opening / closing means 86 are fixed. Further, the circulation mode switching shaft 87 in the present embodiment is formed in a pipe shape above the geothermal water suction pump 7. Further, at the upper end of the circulation mode switching shaft 87, there are provided a screwing portion 89 for moving the circulation mode switching shaft 87 up and down by screwing and a switching shaft length adjusting mechanism 10 as shown in FIG. . The vertical mechanism is not limited to the screwing portion 89, and is appropriately selected from a configuration that can move the circulation mode switching shaft 87 up and down.

  Further, as shown in FIG. 10, the switching shaft length adjustment mechanism 10 in the present embodiment includes a lower adjustment unit 11 and an upper adjustment unit 12, and the lower adjustment unit 11 further includes an empty body 111. And a lid body 112.

  The vacant body 111 of the lower adjustment portion 11 in the present embodiment has a space for inserting the upper adjustment portion 12, and is formed in a cylindrical shape having an inner diameter larger than the outer diameter of the circulation mode switching shaft 87. The circulation mode switching shaft 87 is connected to the upper end. Further, the lid body 112 in the present embodiment is for covering the water tightness after inserting the upper adjustment section 12 into the vacant body 111, and has a hole through which the upper adjustment section 12 is passed. 111 is fixed to the upper part.

  In addition, the upper adjustment portion 12 in the present embodiment has an outer diameter that can be inserted into the hole of the lid body 112, and is inserted into the vacant body 111 and the lid is closed by the lid body 112. By engaging with the body 112, a protrusion 121 is provided to prevent the lower adjustment portion 11 from coming off.

  Therefore, the switching shaft length adjusting mechanism 10 according to the present embodiment can adjust the height by the upper adjusting unit 12 sliding in the empty body 111 of the lower adjusting unit 11.

  The arrangement of the on-off valve 842 of the water intake lower opening / closing means 84, the water intake side opening opening / closing means 85, and the return upper opening opening / closing means 86 is as follows.

  As shown in FIGS. 1 and 2, when the screwing portion 89 and the switching shaft length adjusting mechanism 10 in the present embodiment raise the circulation mode switching shaft 87 to the uppermost position, the water intake lower opening 42 opens. When the intake side opening 43 and the return upper opening 82 are closed and the circulation mode switching shaft 87 is lowered to the lowest position, the intake lower opening 42 is closed, and the intake side opening 43 and A water intake lower opening opening / closing means 84, a water intake side opening opening / closing means 85, and a reduction upper opening opening / closing means 86 are arranged on the circulation mode switching shaft 87 so that the upper opening 82 for reduction opens.

  The mode switching means 8 is not limited to the above-described ones. The return path switching means 81, the intake lower opening 42, the intake side opening 43, and the return upper opening 82 are provided. Any structure that can be opened and closed or switched in conjunction with each other may be selected as appropriate. For example, the return path switching means 81, the intake lower opening opening / closing means 84, the intake side opening opening opening / closing means 85 and the reduction upper opening opening / closing means 86 are constituted by electromagnetic valves, and the circulation mode is appropriately switched by electronic control using a computer. You may do it.

  Next, the effect | action of each structure in the flow-path switching type geothermal water circulation apparatus 1 of this embodiment is demonstrated with the circulation of the geothermal water in a 1st circulation mode and a 2nd circulation mode.

  First, a case where each configuration is the first circulation mode will be described. As shown in FIG. 1, in the first circulation mode in the present embodiment, the return path switching means 81 switches the return path to the first return path 811. The circulation mode switching shaft 87 is raised to the uppermost position by the screwing portion 89 and the switching shaft length adjusting mechanism 10. Thereby, the water intake lower opening 42 is opened, and the water intake side opening 43 and the return upper opening 82 are closed.

  The geothermal water in the first circulation mode enters from the geothermal water strainer 3 provided on the lower flow passage side 6 of the outer tube 2 by the suction force of the geothermal water suction pump 7. At this time, the geothermal water strainer 3 filters impurities such as gravel, sand and mud contained in the invading geothermal water. Moreover, impurities such as algae and scale adhering to the inside of the geothermal water strainer 3 in the second circulation mode described later are sucked and removed by the suction force of the geothermal water suction pump 7. On the other hand, the impurities adhere and accumulate on the aquifer L side of the geothermal water strainer 3.

  Next, the geothermal water that has flowed into the lower flow passage 6 flows into the interior pipe 4 from the lower intake opening 42 that is opened below the interior pipe 4 by the suction force of the geothermal water suction pump 7. come. In the first circulation mode, the intake side opening / closing means 85 closes the intake side opening 43 so that the geothermal water flowing into the interior pipe 4 does not flow into the upper flow passage 5. Further, since the open / close ring 851 of the water intake side surface opening / closing means 85 is fixed to the circulation mode switching shaft 87 by a support arm 852 as shown in FIG. 8, geothermal water can pass between the support arms 852. .

  In the first circulation mode, the reducing upper opening opening / closing means 86 closes the reducing upper opening 82, and the water stop plate 862 prevents the flow in the interior pipe 4. Therefore, the geothermal water does not flow through the reduction communication passage 83, and even if the geothermal water level in the interior pipe 4 and the exterior pipe 2 becomes high, the geothermal water that has flowed into the interior pipe 4 does not flow. It does not flow out above the reducing upper opening opening / closing means 86. Therefore, geothermal water is stored in the interior pipe 4.

  The geothermal water suction pump 7 pumps the geothermal water that flows into the interior pipe 4 and is stored to the ground. The pumped geothermal water is supplied to the cooling / heating device 9 through the circulation mode switching shaft 87 formed in a pipe shape.

  The geothermal water after being used in the air conditioner 9 is returned from the first return path 811 to the upper flow path 5 via the return path switching means 81. At this time, since the lower end of the first return path 811 in the present embodiment is provided at a position lower than the water level W of the geothermal water, the returned geothermal water hardly comes into contact with air. Therefore, there is no pollution by outside air, and since the activity of geothermal water is suppressed, generation | occurrence | production of algae, scale, etc. can be suppressed.

  Further, the upper flow passage 5 and the lower flow passage 6 are surely divided by the locking portion 41 provided in the inner pipe 4 and the support portion 21 provided in the outer pipe 2, and therefore the upper flow passage 5. The geothermal water returned to is not flowed into the lower flow path 6.

  The geothermal water returned to the upper flow passage 5 is returned to the aquifer L from the geothermal water strainer 3 provided on the upper flow passage side 5 of the outer tube 2. At this time, impurities such as algae and scale contained in the geothermal water gradually accumulate inside the geothermal water strainer 3 provided in the upper flow passage 5 for reducing the geothermal water. Impurities adhering to or accumulating on the aquifer L side of the hydrothermal strainer 3 are swept away by the force that the geothermal water seeps into the aquifer L, so that the ground provided on the upper flow passage side 5 of the outer tube 2 The clogging of the hot water strainer 3 is eliminated.

  Next, a case where each configuration is the second circulation mode will be described. As shown in FIG. 2, in the second circulation mode in the present embodiment, the return path switching means 81 switches the return path to the second return path 812. The circulation mode switching shaft 87 is lowered to the lowest position by the screwing portion 89 and the switching shaft length adjusting mechanism 10. Thereby, the water intake lower opening 42 is closed, and the water intake side opening 43 and the return upper opening 82 are opened.

  The geothermal water in the second circulation mode enters from the geothermal water strainer 3 provided on the upper flow path side 5 of the outer tube 2 by the suction force of the geothermal water suction pump 7. At this time, the geothermal water strainer 3 filters impurities such as gravel, sand and mud contained in the invading geothermal water. Further, impurities such as algae and scale adhering to the inside of the geothermal water strainer 3 in the first circulation mode are sucked and removed by the suction force of the geothermal water suction pump 7. On the other hand, the impurities adhere and accumulate on the aquifer L side of the geothermal water strainer 3.

  Due to the support portion 21 and the locking portion 41, geothermal water that has entered the upper flow passage 5 does not flow to the lower flow passage 6. Therefore, the geothermal water that has flowed into the upper flow passage 5 flows into the interior pipe 4 from the intake side opening 43.

  In the second circulation mode, since the intake lower opening opening / closing means 84 closes the intake lower opening 42, the geothermal water flowing into the interior pipe 4 does not flow into the lower flow passage 6. In addition, even if the water level W of the geothermal water is high, the geothermal water that has flowed into the interior pipe 4 does not flow above the water stop plate 862 of the upper opening opening / closing means 86 for reduction. Therefore, geothermal water is stored in the interior pipe 4.

  The geothermal water suction pump 7 pumps geothermal water that has flowed into and stored in the interior pipe 4 to the ground, and the geothermal water is supplied to the cooling and heating device 9 through the circulation mode switching shaft 87. .

  The geothermal water after being used in the air conditioner 9 is returned from the second return path 812 into the interior pipe 4 via the return path switching means 81. Since the lower end of the second return path 812 in the present embodiment is provided at a position lower than the water level of the geothermal water, the returned geothermal water hardly comes into contact with air. Therefore, as in the first circulation mode, there is no contamination by outside air, and the activity of geothermal water is suppressed, so that generation of algae, scales, and the like can be suppressed.

  Further, the geothermal water returned into the interior pipe 4 flows from the upper opening 82 for reduction to the lower flow path 6 through the reduction communication path 83. At this time, the geothermal water does not flow downward from the reducing upper opening opening / closing means 86 by the water stop plate 862 of the reducing upper opening opening / closing means 86.

  The geothermal water returned to the lower flow passage 6 is returned to the aquifer L from the geothermal water strainer 3 provided on the lower flow passage 6 side of the outer tube 2. At this time, impurities such as algae and scale contained in the geothermal water gradually accumulate inside the geothermal water strainer 3 provided in the lower flow passage 6 for reducing the geothermal water. Impurities adhering or depositing on the aquifer L side of the geothermal water strainer 3 are washed out by the force that the geothermal water exudes to the aquifer L. The clogging of the provided geothermal water strainer 3 is eliminated.

According to the flow path switching type geothermal water circulation device 1 of the present embodiment as described above, the following effects can be obtained.
1. By appropriately switching between the first circulation mode and the second circulation mode, impurities attached and deposited on the geothermal water strainer 3 can be removed, and clogging can be suppressed.
2. Since geothermal water is recycled, there is no concern about well drainage or land subsidence.
3. Since the circulating geothermal water is kept out of contact with the outside air, it suppresses the generation of algae and scales, suppresses the breakdown of equipment caused by algae and scales, and also suppresses the contamination of geothermal water. can do.

  In addition, the flow-path switching type geothermal water circulation apparatus 1 which concerns on this invention is not limited to embodiment mentioned above, It can change suitably.

  For example, the pumped geothermal water is not limited to being used as a heat source for the air conditioner 9 or the like, but may be used as a water source by providing a faucet or the like.

DESCRIPTION OF SYMBOLS 1 Flow-path-switching type geothermal water circulation apparatus 2 Exterior pipe 3 Geothermal water strainer 4 Interior pipe 5 Upper flow path 6 Lower flow path 7 Geothermal water suction pump 8 Mode switching means 9 Cooling and heating apparatus 10 Switching shaft length adjustment part 11 Lower side Adjusting part 12 Upper adjusting part 21 Supporting part 41 Locking part 42 Intake lower opening 43 Intake side opening 81 Return path switching means 82 Reduction upper opening 83 Reduction communication path 84 Intake lower opening opening / closing means 85 Intake Side opening / closing means for reduction 86 Upper opening opening / closing means for reduction 87 Circulation mode switching shaft 88 Cylinder 89 Screwing portion 111 Vacant body 112 Lid body 121 Projection portion 811 First return path 812 Second return path 841 Open / close valve seat 842 Open / close valve 851 Open / close ring 852 Support arm 861 Open / close ring 862 Water stop plate
L Aquifer W Water level of geothermal water

Claims (3)

A boundary between an outer pipe buried from the surface to the aquifer, an inner pipe arranged inside the outer pipe, a geothermal water suction pump arranged in the inner pipe, and the aquifer in the outer pipe A geothermal water circulation device with a channel switching type having a geothermal water strainer provided in
An upper flow passage and a lower flow passage formed by closing the flow passage formed between the outer tube and the inner tube so as to be vertically divided;
The geothermal water of the aquifer is infiltrated from the geothermal water strainer provided on the lower flow path side of the outer tube by the suction force of the geothermal water suction pump, and the geothermal water is supplied to the interior pipe From the lower opening for taking water into the interior pipe, pumped to the ground, and after using the geothermal water, the geothermal water was provided on the upper flow passage side of the exterior pipe A first circulation mode that is circulated and controlled to return to the aquifer from the geothermal water strainer;
The geothermal water of the aquifer is infiltrated from the geothermal water strainer provided on the upper flow path side of the outer tube by the suction force of the geothermal water suction pump, and the geothermal water is supplied to the interior pipe From the side opening for water intake opened on the side surface, it was introduced into the interior pipe and pumped to the ground, and after using the geothermal water, the geothermal water was provided on the lower flow passage side of the exterior pipe. A second circulation mode that is circulated and controlled to return from the geothermal water strainer to the aquifer;
A flow path switching type geothermal water circulation device comprising: mode switching means for switching the circulation mode to the first circulation mode or the second circulation mode. The mode switching means is
When returning after using geothermal water, return path switching means for switching the return path to either the first return path to return to the upper flow path and the second return path to return to the interior pipe,
An upper opening for reduction that opens above the side opening for water intake formed in the interior pipe and functions as a water intake for reduction during the second circulation mode;
A communication path for reduction formed in such a manner as to be able to flow from the upper opening for reduction to the lower flow path;
Water intake lower opening opening and closing means for opening and closing the water intake lower opening;
Water intake side opening opening and closing means for opening and closing the water intake side opening;
An upper opening / closing means for reducing and opening the upper opening for reducing;
When the circulation mode is switched to the first circulation mode by the mode switching means, the return path switching means switches the geothermal water return path to the first return path, and the intake lower opening opening / closing means switches the intake water. Opening the lower opening for the water, and closing the water intake side opening and the upper opening for reduction by the intake side opening / closing means and the upper opening opening / closing means for reduction, respectively.
When the circulation mode is switched to the second circulation mode by the mode switching means, the return path switching means switches the geothermal water return path to the second return path, and the intake lower opening opening / closing means switches the intake water. 2. The lower opening for water is closed, and the side opening for intake and the upper opening for reduction are respectively opened by the intake side opening opening / closing means and the upper opening opening opening / closing means for reduction to constitute a circulation path. The flow path switching type geothermal water circulation device described in 1.   The lower opening opening / closing means, the water intake side opening opening / closing means, and the reduction upper opening opening / closing means are coaxially provided on a circulation mode switching shaft that is pivotally supported in the interior pipe so as to be vertically movable. Item 3. A flow-switching type geothermal water circulation device according to item 2.

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