Pumped water returned water unit, pumped water returned water control unit, and underground heat utilization system

Abstract

To provide a pumped water returned water unit, a pumped water returned water control system, and an underground heat utilization system that can be easily inserted into and removed from a well.SOLUTION: A pumped water returned water unit comprises: a housing comprising a flow passage through which pumped water from a well and returned water to the well flow, and a branch flow passage; a first flange provided at a first end of the housing, and comprising an opening on one end side of the flow passage; a second flange provided at a second end of the housing, and comprising an opening on the other end side of the flow passage; a branch flow passage branching from the flow passage in the housing, and communicating with the outside of the housing; and a water injection valve mechanism capable of opening and closing the branch flow passage. The branch flow passage branches from the flow passage in the housing, and communicates with the outside of the housing. The water injection valve mechanism is located within a region in which a surface connecting an outer periphery of the first flange and an outer periphery of the second flange is a peripheral surface.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a pumping and re-injecting unit, a pumping and re-injecting control system, and a ground source heat utilization system.

Background Art

[0002] In recent years, a ground source heat utilization system has been proposed in which groundwater is pumped up from a well and used as a heat source or a cold source.

[0003] As related art, for example, Patent Document 1 discloses a configuration including a pressure regulating valve for adjusting water injection into a well and a check valve provided in parallel with the pressure regulating valve and integrally formed with the pressure regulating valve, inside the well.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the configuration described in Patent Document 1, since the pressure regulating valve and the check valve integrally formed are provided in parallel inside the well, the unit including these pressure regulating valve and check valve is likely to be enlarged. Therefore, depending on the inner diameter of the well during construction and maintenance of the ground source heat utilization system, it may be difficult to insert and remove the unit including the pressure regulating valve and the check valve into and from the inside of the well.

[0006] The present disclosure has been made to solve the above problems, and an object thereof is to provide a pumping and re-injecting unit, a pumping and re-injecting control system, and a ground source heat utilization system capable of easily inserting and removing into and from the inside of a well.

Means for Solving the Problems

[0007] In order to solve the above problems, the pumping and re-injecting unit according to the present disclosure includes a housing having a flow path through which water pumped from a well and water re-injected into the well flows, and a branch flow path, a first flange provided at a first end of the housing and having an opening on one end side of the flow path, a second flange provided at a second end of the housing and having an opening on the other end side of the flow path, and a water injection valve mechanism capable of opening and closing the branch flow path. The branch flow path branches from the flow path inside the housing and communicates with the outside of the housing, and the water injection valve mechanism is accommodated in a region having a circumferential surface that is a surface connecting the outer circumference of the first flange and the outer circumference of the second flange.

[0008] The pumping and re-injecting control system according to the present disclosure includes the pumping and re-injecting unit, and a pilot mechanism provided outside the housing that supplies a pressure for driving the water injection valve mechanism in the opening and closing direction by supplying and discharging water to and from the water injection valve mechanism.

[0009] The geothermal energy utilization system according to the present disclosure includes the pumping and re-injecting control system, a main pipe connected to the first flange, a pump capable of pumping water into the main pipe, a check valve provided between the second flange and the pump, the well, and a heat exchanger that exchanges heat with the main pipe.

Advantages of the Invention

[0010] According to the pumping and re-injecting unit, the pumping and re-injecting control system, and the geothermal energy utilization system of the present disclosure, the insertion and extraction into the well can be easily performed.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. In all the drawings, the same or corresponding components are denoted by the same reference numerals, and common descriptions are omitted.

[0013] <Embodiment> Embodiments of the ground source heat utilization system according to the present disclosure will be described with reference to FIGS. 1 to 6.

[0014] (Configuration of the ground source heat utilization system) As shown in FIG. 1, the ground source heat utilization system 9 includes a pumping and water return control system 1, a well 2, a main pipe 3, a heat exchanger 4, a pump 5, and a check valve 6. For example, the ground source heat utilization system 9 may include a plurality of pumping and water return control systems 1, a plurality of wells 2, a main pipe 3, a heat exchanger 4, a plurality of pumps 5, and a plurality of check valves 6.

[0015] (Configuration of the well) The plurality of wells 2 extend from the ground OG into the aquifer LY. For example, the plurality of wells 2 may include a hot water well 21 and a cold water well 22. The hot water well 21 and the cold water well 22 are each configured to be able to take in groundwater in the aquifer or return groundwater from inside the hot water well 21 and the cold water well 22 to the aquifer. Hereinafter, the case of using the stored water pumped up from the hot water well 21 for heat utilization is described. However, the ground source heat utilization system 9 can utilize not only the stored water pumped up from the hot water well 21 but also the stored water pumped up from the cold water well 22 for heat utilization.

[0016] Each well 2 includes a casing 2a embedded in a borehole HOL drilled underground from the ground OG toward the aquifer LY. For example, a plurality of slits 2b are formed in the casing 2a. Due to the plurality of slits 2b, the well 2 is configured to be able to take in the groundwater in the aquifer LY into the inside of the casing 2a or return the stored water from the inside of the casing 2a to the aquifer LY.

[0017] (Configuration of the main pipe) The main pipe 3 extends inside the well 2. For example, the main pipe 3 may have both ends immersed in the stored water of each of the hot water well 21 and the cold water well 22 so as to connect the hot water well 21 and the cold water well 22. For example, one end of the main pipe 3 may be provided inside the hot water well 21 and the other end of the main pipe 3 may be provided in the cold water well 22 so that the stored water pumped up by the pump 5 can flow from the hot water well 21 toward the cold water well 22.

[0018] (Configuration of the heat exchanger) The heat exchanger 4 exchanges heat with the water in the main pipe 3 via the main pipe 3. For example, heat exchange may be performed between the heat exchanger 4 and the water pumped up from the well 2 and flowing in the main pipe 3, and the water after the heat exchange may flow in the main pipe 3 and be injected into the well 2. For example, the heat exchanger 4 may be provided in the middle of the main pipe 3 on the ground OG.

[0019] (Configuration of the pump) The pump 5 pumps water from the well 2 into the main pipe 3. For example, the pump 5 may be provided at both ends of the main pipe 3 and immersed in the stored water in the well 2. For example, the pump 5 may be able to change its output by inverter control.

[0020] (Configuration of the check valve) The check valve 6 is provided in the main pipe 3. The check valve 6 is provided between the pumping and returning unit 50 described later and the pump 5. The check valve 6 allows water to flow in only one direction in the main pipe 3 between the pump 5 and the pumping and water return unit 50. The check valve 6 is configured such that water flows from the pump 5 toward the pumping and water return unit 50 described later, and water does not flow from the pumping and water return unit 50 toward the pump 5.

[0021] (Configuration of the pumping and water return control system) As shown in FIG. 2, the pumping and water return control system 1 includes a pumping and water return unit 50 and a pilot mechanism 100. The pumping and water return control system 1 is provided in each well 2.

[0022] (Configuration of the pumping and water return unit) The pumping and water return unit 50 is provided inside each well 2. The pumping and water return unit 50 may be provided in the middle of the main pipe 3 inside the well 2. The pumping and water return unit 50 may be disposed above the pump 5 and the check valve 6.

[0023] As shown in FIGS. 3 and 4, the pumping and water return unit 50 includes a housing 51, a first flange 52, a second flange 53, and a water injection valve mechanism 60. As shown in FIG. 3, the housing 51 has a flow path 55, a branch flow path 56, and a communication port 57. The housing 51 may be provided such that the direction connecting the first end 51s and the second end 51t of the housing 51 follows the vertical direction inside the well 2. The housing 51 may integrally include a first housing part 51a and a second housing part 51b.

[0024] The first housing part 51a extends in the direction connecting the first end 51s and the second end 51t of the housing 51. The flow path 55 is formed inside the first housing part 51a. The flow path 55 allows the pumped water from the well 2 and the returned water to the well 2 to flow through. The flow path 55 may be formed so as to penetrate the first end 51s and the second end 51t of the housing 51. In the first housing part 51a, an intermediate part 51c between the first end 51s and the second end 51t is formed so as to project toward one side in the radial direction Dr of the housing 51 that intersects the vertical direction with respect to the first end 51s and the second end 51t. Along with this, the flow path 55 is formed such that the flow path intermediate part 55c between the first flow path end part 55s on the first end 51s side and the second flow path end part 55t on the second end 51t side extends in the vertical direction at a position biased toward one side in the radial direction Dr.

[0025] As shown in FIGS. 3 and 4, the first flange 52 is provided at the first end 51s of the housing 51. The first flange 52 is formed to project outward in the radial direction Dr from the first housing part 51a. The first flange 52 has an opening 55d on the side of the first flow path end part 55s of the flow path 55 on its inner side. A piping member (not shown) constituting the main pipe 3 is detachably connected to the first flange 52 from above by a plurality of bolts.

[0026] The second flange 53 is provided at the second end 51t of the housing 51. The second flange 53 is formed to project outward in the radial direction Dr from the first housing part 51a. The second flange 53 has an opening 55e on the side of the second flow path end part 55t of the flow path 55 on its inner side. A piping member (not shown) constituting the main pipe 3 is detachably connected to the second flange 53 from below by a plurality of bolts.

[0027] The second housing part 51b may be provided so as to project outward in the radial direction Dr of the housing 51 from the outer peripheral surface 51f of the first housing part 51a. The second housing part 51b may extend outward in the radial direction Dr of the housing 51 from the outer peripheral surface 51f of the first housing part 51a. The second housing part 51b may be provided so as to protrude from the outer peripheral surface 51f of the first housing part 51a to the other side in the radial direction Dr of the housing 51. The second housing part 51b may be provided so as to protrude from the intermediate part 51c of the first housing part 51a to the other side in the radial direction Dr.

[0028] As shown in FIG. 3, the second housing part 51b may have a first cylindrical part 51g and a second cylindrical part 51h. The first cylindrical part 51g may be provided so as to protrude from the outer peripheral surface 51f of the first housing part 51a to the other side in the radial direction Dr. A flange 51r that expands in diameter from the first cylindrical part 51g may be provided at the tip of the first cylindrical part 51g.

[0029] The second cylindrical part 51h is provided inside the first cylindrical part 51g with a gap therebetween. A branch flow path 56 is formed inside the second cylindrical part 51h. The tip of the second cylindrical part 51h is formed so as to be located on one side in the radial direction Dr from the tip of the first cylindrical part 51g. An annular space S is formed between the first cylindrical part 51g and the second cylindrical part 51h when viewed from the extending direction C of the branch flow path 56.

[0030] The branch flow path 56 is provided so as to branch from the flow path 55 inside the housing 51. The branch flow path 56 may branch from the flow path intermediate part 55c between the first flow path end part 55s and the second flow path end part 55t of the flow path 55 inside the housing 51. The branch flow path 56 may be formed so as to extend in the radial direction Dr of the housing 51 that intersects the direction connecting the first end 51s and the second end 51t. The branch flow path 56 has an opening 56d at the tip outside the radial direction Dr of the second cylindrical part 51h. The branch flow path 56 is configured to be communicable with the outside of the housing 51. The branch flow path 56 may communicate with the outside of the housing 51 via the communication port 57.

[0031] The communication port 57 is formed in the second part 51b of the housing. The communication port 57 may be provided in the first cylindrical portion 51g. The communication port 57 may be formed so as to penetrate the inner surface and the outer surface of the first cylindrical portion 51g. A plurality of communication ports 57 may be provided at intervals in the circumferential direction of the first cylindrical portion 51g. When the opening 56d of the branch flow path 56 is opened by the water injection valve mechanism 60 described later, the communication port 57 communicates the inside of the branch flow path 56 with the outside of the housing 51.

[0032] (Configuration of the water injection valve mechanism) The water injection valve mechanism 60 is configured to be able to open and close the branch flow path 56. The water injection valve mechanism 60 may be provided at the flow path end portion outside the radial direction Dr in the branch flow path 56. The water injection valve mechanism 60 is configured to be able to open and close the opening 56d of the branch flow path 56.

[0033] The water injection valve mechanism 60 includes a valve body 61, a diaphragm 62, a cover 63, and a guide mechanism 64. The valve body 61 is configured to be able to open and close the branch flow path 56. The valve body 61 is configured to be able to open and close the opening 56d of the branch flow path 56. The valve body 61 is configured to be able to open and close the opening 56d by moving forward and backward along the extending direction C of the branch flow path 56. The valve body 61 is formed in a disk shape extending along a plane orthogonal to the extending direction C. The valve body 61 has an outer diameter larger than the inner diameter of the opening 56d.

[0034] The valve body 61 has a seat surface 61s that can contact the inner peripheral edge of the opening 56d. The seat surface 61s may be formed in a tapered shape in which the diameter dimension gradually decreases as it approaches the opening 56d in the radial direction. The valve body 61 can close the opening 56d in a state where the seat surface 61s contacts the inner peripheral edge of the opening 56d. As shown in FIG. 5, the valve body 61 can release the opening 56d in a state where the seating surface 61s is separated from the inner peripheral edge of the opening 56d outward in the radial direction Dr. In a state where the seating surface 61s of the valve body 61 is separated from the inner peripheral edge of the opening 56d outward in the radial direction Dr, a gap H is formed between the valve body 61 and the inner peripheral edge of the opening 56d. In a state where the seating surface 61s of the valve body 61 is separated from the inner peripheral edge of the opening 56d outward in the radial direction Dr, the inside of the branch flow path 56 communicates with the outside of the housing 51 through the gap H, the annular space S, and the communication port 57.

[0035] As shown in FIG. 3, in the valve body 61, a reinforcing plate 61p is provided on the side (outer side in the radial direction Dr) separated from the opening 56d in the direction along the extending direction C. The reinforcing plate 61p is a plate shape having the same diameter as the valve body 61. The reinforcing plate 61p is made of metal and reinforces the valve body 61 by following the valve body 61.

[0036] The diaphragm 62 is connected to the valve body 61. The diaphragm 62 is provided in a film shape so as to extend from the valve body 61 to the outer peripheral side. The thickness of the diaphragm 62 is smaller than the thickness of the valve body 61. The diaphragm 62 is provided so as to close the first cylindrical portion 51g of the second part 51b of the housing. The outer peripheral portion of the diaphragm 62 is sandwiched between the cover 63 and the flange 51r of the first cylindrical portion 51g.

[0037] The diaphragm 62 may be integrally formed with the valve body 61. The diaphragm 62 is elastically deformable in the opening and closing direction of the valve body 61. When the valve body 61 moves forward and backward in the opening and closing direction, the diaphragm 62 elastically deforms in the extending direction of the second part 51b of the housing. The diaphragm 62 may be formed using, for example, a rubber-based material. The valve body 61 formed integrally with the diaphragm 62 may be formed using a rubber-based material of the same material as the diaphragm 62.

[0038] The guide mechanism 64 is connected to the valve body 61. The guide mechanism 64 guides the valve body 61 within the branch flow path 56 so that the valve body 61 moves in the extending direction of the branch flow path 56. The guide mechanism 64 includes, for example, a shaft 65 and guide vanes 66.

[0039] The shaft 65 extends in the extending direction of the branch flow path 56. The base end portion of the shaft 65 is connected to the valve body 61. The tip end portion of the shaft 65 is inserted into a guide cylinder portion 51p provided in the first housing portion 51a. The tip end portion of the shaft 65 is movably supported within the guide cylinder portion 51p in the extending direction C of the branch flow path 56.

[0040] The guide vanes 66 are connected to the valve body 61. A plurality of guide vanes 66 are provided at intervals in the circumferential direction around the central axis of the shaft 65. The guide vanes 66 are inserted into the branch flow path 56. The plurality of guide vanes 66 guide the valve body 61 by slidingly contacting the inner peripheral surface of the second cylindrical portion 51h.

[0041] The cover 63 is provided together with the diaphragm 62 so as to close the first cylindrical portion 51g of the second housing portion 51b. The outer peripheral portion 63a of the cover 63 is attached to the flange 51r of the first cylindrical portion 51g by a plurality of bolts (not shown). The central portion 63b of the cover 63 projects radially outward in the radial direction Dr from the diaphragm 62 with respect to the outer peripheral portion 63a.

[0042] A diaphragm chamber 67 is formed between the cover 63 and the diaphragm 62. As shown in FIGS. 3 and 4, the diaphragm chamber 67 has a water injection port 68 and a drain port 69. The water injection port 68 is configured to be able to inject water into the diaphragm chamber 67 from the pilot mechanism 100 described later. The drain port 69 is configured to be able to drain water from the diaphragm chamber 67 to the pilot mechanism 100.

[0043] The diaphragm chamber 67 is configured to be able to supply a pressure for driving the diaphragm 62 in the opening and closing directions from the pilot mechanism 100 outside the housing 51. By injecting water into the diaphragm chamber 67 through the water injection port 68, the diaphragm chamber 67 exerts a pressure for driving the diaphragm 62 and the valve body 61 in the closing direction. By discharging the water in the diaphragm chamber 67 to the outside through the drain port 69, the diaphragm chamber 67 reduces the pressure for driving the diaphragm 62 and the valve body 61 in the closing direction.

[0044] As shown in FIG. 3, the entire water injection valve mechanism 60 is accommodated in a region A having a circumferential surface that is a surface connecting the outer periphery 52s of the first flange 52 and the outer periphery 53s of the second flange 53. The region A, that is, the first flange 52 and the second flange 53, may be, for example, 315 mm or less in outer diameter. The region A, that is, the first flange 52 and the second flange 53, may be, for example, 250 mm or less in outer diameter.

[0045] (Configuration of the pilot mechanism) As shown in FIG. 2, the pilot mechanism 100 is provided outside each well 2. The pilot mechanism 100 may be provided on the ground OG outside each well 2. At least a part of the pilot mechanism 100 may be provided inside the well 2.

[0046] The pilot mechanism 100 supplies a pressure for driving the water injection valve mechanism 60 in the opening and closing directions by supplying and discharging water to and from the water injection valve mechanism 60. The pilot mechanism 100 may include a pressure line 110, a strainer 111, a pilot valve 112, and a register 113.

[0047] The pressurized line 110 is provided by branching from the main pipe 3 connected to the first flange 52. One end of the pressurized line 110 is connected to the main pipe 3 above the pumping and return unit 50. The other end of the pressurized line 110 is connected to the water injection port 68. The pressurized line 110 applies pressure to the water injection valve mechanism 60 in the closing direction by introducing a part of the water flowing through the main pipe 3. The pressurized line 110 applies pressure to the water injection valve mechanism 60 in the closing direction by injecting water from the water injection port 68 into the diaphragm chamber 67.

[0048] The strainer 111 is provided in the pressurized line 110. The strainer 111 collects foreign substances and the like contained in the water flowing from the main pipe 3 into the pressurized line 110.

[0049] The pilot valve 112 is provided in the pressurized line 110. The pilot valve 112 has a drain line 114 connected to the pressurized line 110. The pilot valve 112 is configured to be able to open and close the drain line 114. The pilot valve 112 is configured to be able to release the pressure in the pressurized line 110 when the pressure in the pressurized line 110 becomes equal to or higher than the set pressure. The pilot valve 112 is configured to be able to release the pressure in the pressurized line 110 by discharging a part of the water in the pressurized line 110 to the outside of the pressurized line 110.

[0050] The pilot valve 112 may have a pressure detection unit 112s for detecting the pressure in the pressurized line 110. The pilot valve 112 is configured to be able to release the pressure in the pressurized line 110 when the pressure detected by the pressure detection unit 112s becomes equal to or higher than the set pressure. The pilot valve 112 may be biased in the direction of closing the drain line 114 by a spring (not shown). A plurality of types of springs for the pilot valve 112 having different elastic coefficients may be prepared. The spring of the pilot valve 112 may be appropriately selected from among a plurality of types according to the set pressure.

[0051] The register 113 is provided in the pressurizing line 110. The register 113 may be provided between the pressure detection unit 112s and the pilot valve 112 in the pressurizing line 110. The register 113 is configured to be able to adjust the change in the flow rate of water in the pressurizing line 110 when the pilot valve 112 releases the pressure in the pressurizing line 110. The register 113 is configured to suppress a rapid change in the flow rate of water in the pressurizing line 110 when the pilot valve 112 releases the pressure in the pressurizing line 110.

[0052] The pilot mechanism 100 may include a pressure reducing line 120, a solenoid valve 121, and an orifice 122.

[0053] The pressure reducing line 120 is configured to be able to discharge water from the water injection valve mechanism 60 when opening the water injection valve mechanism 60. One end of the pressure reducing line 120 is connected to the drain port 69 of the water injection valve mechanism 60. The pressure reducing line 120 discharges the water drained from the drain port 69 to the outside of the pumping and water return unit 50. The pressure reducing line 120 is configured to be able to discharge water from the water injection valve mechanism 60 when opening the water injection valve mechanism 60. The pressure reducing line 120 may be configured to be able to discharge water from the diaphragm chamber 67 when opening the water injection valve mechanism 60. The pressure reducing line 120 reduces the pressure applied to the water injection valve mechanism 60 by discharging water from the diaphragm chamber 67.

[0054] The solenoid valve 121 is provided in the pressure reducing line 120. The solenoid valve 121 is configured to be able to open and close the pressure reducing line 120. The solenoid valve 121 may be driven by a control device (not shown) or the like. The solenoid valve 121 is configured to be able to discharge water from the water injection valve mechanism 60 through the pressure reduction line 120 with the pressure reduction line 120 open.

[0055] The orifice 122 is provided on the upstream side of the solenoid valve 121 in the pressure reduction line 120. The orifice 122 is a member that restricts the flow rate of water flowing in the pressure reduction line 120. The inner diameter of the flow path of the orifice 122 may be smaller than the inner diameter of the pressure reduction line 120.

[0056] (Operation of the pumping and return water control system: during pumping) In the pumping and return water control system 1 as described above, when pumping water from the well 2, as shown in FIG. 6, the solenoid valve 121 is closed by a control device (not shown) or the like. When pumping water from the well 2, the pump 5 is operated by a control device or the like. When pumping water from the well 2 and the pump 5 is operated, the pump 5 sucks up the water in the well 2. The water sucked up by the pump 5 is sent into the pumping and return water unit 50 through the main pipe 3. The water sucked up by the pump 5 flows only in the direction toward the pumping and return water unit 50 by passing through the check valve 6. The water sucked up by the pump 5 and passing through the check valve 6 is blocked by the check valve 6 from flowing back from the pumping and return water unit 50 toward the pump 5 side.

[0057] The water sent into the pumping and return water unit 50 passes through the flow path 55, flows into the main pipe 3 above the pumping and return water unit 50, and is pumped from the well 2. A part of the water that passes through the flow path 55 and flows into the main pipe 3 above the pumping and return water unit 50 flows into the pressurization line 110. The water that has flowed into the pressurization line 110 is sent into the diaphragm chamber 67 from the water injection port 68 through the strainer 111 and the register 113. Due to the pressure of the water sent into the diaphragm chamber 67, the diaphragm 62 and the valve body 61 are pressed, and the valve body 61 closes the opening 56d.

[0058] In this way, in the pumping and returning unit 50, water is pumped through the flow path 55. Here, when the pressure of the water flowing into the pressure line 110 becomes equal to or higher than the set pressure, the pilot valve 112 opens, and a part of the water in the pressure line 110 is drained from the drain line 114. As a result, the pressure in the pressure line 110 decreases, and the pressure in the diaphragm chamber 67 is prevented from rising excessively.

[0059] (Operation of the pumping and returning control system: During water return) In the pumping and returning control system 1 as described above, when normally returning water to the well 2, the solenoid valve 121 is kept closed by a control device (not shown) or the like. When water pumped from another well 2 flows into the main pipe 3 above the pumping and returning unit 50, water flows into the flow path 55 from the main pipe 3. The water flowing into the flow path 55 is blocked from flowing from the flow path 55 to the pump 5 side by the check valve 6. The water flowing into the flow path 55 flows into the branch flow path 56 and presses the valve body 61 in the opening direction.

[0060] A part of the water flowing from another well 2 into the main pipe 3 flows into the pressure line 110. The water flowing into the pressure line 110 is sent into the diaphragm chamber 67 from the water injection port 68 through the strainer 111 and the register 113. At this time, when the pressure of the water flowing into the pressure line 110 becomes equal to or higher than the set pressure, the pilot valve 112 opens, and a part of the water in the pressure line 110 is drained from the drain line 114. As a result, the pressure in the pressure line 110 decreases, and the pressure in the diaphragm chamber 67 decreases. Therefore, when the pressure of the water flowing into the branch flow path 56 exceeds the pressure in the diaphragm chamber 67, the water in the diaphragm chamber 67 is pushed out to the outside through the pressure reducing line 120, and the valve body 61 opens. When the valve body 61 opens, the water in the branch flow path 56 flows out to the outside through the gap H, the annular space S, and the communication port 57. Thereby, the water can be returned to the well 2.

[0061] However, when forcibly returning water to the well 2, as shown in FIG. 2, the solenoid valve 121 is opened by a control device (not shown) or the like. When the solenoid valve 121 opens, the water in the diaphragm chamber 67 can be discharged from the drain port 69 through the decompression line 120. When the pressure of the water flowing into the branch flow path 56 exceeds the pressure in the diaphragm chamber 67, the water in the diaphragm chamber 67 is pushed out to the outside through the decompression line 120, and the valve body 61 opens. When the valve body 61 opens, the water in the branch flow path 56 flows out to the outside through the gap H, the annular space S, and the communication port 57. Thereby, the water can be returned to the well 2.

[0062] (Operation and Effect) According to the present embodiment, in the pumping and water return unit 50, the water injection valve mechanism 60 is accommodated in the region A having a circumferential surface that is a surface connecting the outer periphery 52s of the first flange 52 and the outer periphery 53s of the second flange 53. Therefore, it is possible to prevent the water injection valve mechanism 60 from protruding outside the first flange 52 and the second flange 53. Thereby, when inserting and removing the pumping and water return unit 50 into and from the inside of the well 2 for installation and maintenance, it is possible to prevent the water injection valve mechanism 60 from interfering with the inner surface of the well 2. Therefore, it is possible to provide the pumping and water return unit 50 that can be easily inserted into and removed from the inside of the well 2.

[0063] Also, according to an example of the present embodiment, by supplying pressure from the pilot mechanism 100 to the diaphragm chamber 67, the diaphragm 62 connected to the valve body 61 elastically deforms, and the valve body 61 is driven in the opening and closing directions. As a result, the branch flow path 56 can be opened and closed by the valve body 61. When the branch flow path 56 is opened by the valve body 61, the water flowing in the flow path 55 is discharged from the branch flow path 56 to the outside of the housing 51, and water can be injected into the well 2 when the water is returned to the well 2.

[0064] Further, according to an example of the present embodiment, by injecting water into the diaphragm chamber 67 through the water injection port 68 from the pilot mechanism 100, the inside of the diaphragm chamber 67 can be pressurized, and the valve body 61 can be driven in the closing direction. Also, by draining the water from the diaphragm chamber 67 to the pilot mechanism 100 through the drain port 69, the inside of the diaphragm chamber 67 can be depressurized, and the valve body 61 can be operated in the opening direction.

[0065] Further, according to an example of the present embodiment, by guiding the valve body 61 by the guide mechanism 64, the valve body 61 can be stably moved in the extending direction C of the branch flow path 56.

[0066] Further, according to an example of the present embodiment, the branch flow path 56 is formed to extend in the radial direction Dr of the housing 51 from the flow path 55, and the water injection valve mechanism 60 is provided at the flow path end of the branch flow path 56, so that the water injection valve mechanism 60 can be laid out so as to be housed in a region A having a circumferential surface that is a surface connecting the outer periphery 52s of the first flange 52 and the outer periphery 53s of the second flange 53. Also, by forming the branch flow path 56 to extend in the radial direction Dr of the housing 51 from the flow path 55, even if the valve body 61 and the diaphragm 62 of the water injection valve mechanism 60 are increased in diameter, the water injection valve mechanism 60 can be easily laid out while being housed in the region A.

[0067] Further, according to an example of the present embodiment, by forming the communication port 57 in the housing second portion 51b that protrudes radially outward in the radial direction Dr from the outer peripheral surface 51f of the housing first portion 51a, it is easy to secure a large opening area of the communication port 57. Therefore, the water flowing from the flow path 55 into the branch flow path 56 can be efficiently injected into the well 2 through the communication port 57.

[0068] Also, according to an example of the present embodiment, by setting the region A having a circumferential surface formed by connecting the outer periphery 52s of the first flange 52 and the outer periphery 53s of the second flange 53 to have an outer diameter of 315 mm or less, it is possible to easily insert and remove the pumping and water return unit 50 into and from the well 2 even in a well 2 having a small inner diameter. As a result, it is also possible to reduce the diameter of the well 2.

[0069] Further, according to the pumping and water return control system 1 of the present embodiment, it is possible to provide a pumping and water return control system 1 including a pumping and water return unit 50 that can be easily inserted into and removed from the well 2.

[0070] Also, according to an example of the present embodiment, the pumping and water return control system 1 includes a pilot valve 112 and a register 113 in the pressure line 110. Thereby, when the pressure in the pressure line 110 becomes equal to or higher than the set pressure, the pressure applied to the water injection valve mechanism 60 can be appropriately adjusted by releasing the pressure in the pressure line 110 with the pilot valve 112. Furthermore, when the pressure in the pressure line 110 is released by the pilot valve 112, the change in the water flow rate in the pressure line 110 is adjusted by the register 113. Thereby, it is possible to suppress a sudden change in the pressure applied from the pilot mechanism 100 to the water injection valve mechanism 60. Therefore, the water injection valve mechanism 60 can be smoothly opened and closed, and the occurrence of a water hammer phenomenon can be suppressed.

[0071] Also, according to an example of the present embodiment, a solenoid valve 121 and an orifice 122 are provided in the pressure reducing line 120. Thereby, by opening the pressure reducing line 120 with the solenoid valve 121, the pressure applied to the water injection valve mechanism 60 in the pressure reducing line 120 is decreased, and the water injection valve mechanism 60 can be opened. In this case, by providing an orifice 122 for restricting the flow rate of the water flowing in the pressure reducing line 120 on the upstream side of the solenoid valve 121, the amount of water in the pressure reducing line 120 when the solenoid valve 121 opens and closes can be appropriately adjusted, and the operation of the water injection valve mechanism 60 can be stabilized.

[0072] The ground heat utilization system 9 of this embodiment includes the above-mentioned pumping and re-injection control system 1. Thereby, a ground heat utilization system 9 configured by using a pumping and re-injection unit 50 that can easily insert and remove into the well 2 can be provided.

[0073] (Modification example) In one example of the above embodiment, the branch flow path 56 branches from the middle part 55c of the flow path 55, but it may be configured in any way. As a modification example, the branch flow path 56 may branch from the first end part 55s of the flow path 55. As another modification example, the branch flow path 56 may branch from the second end part 55t of the flow path 55.

[0074] In one example of the above embodiment, the second housing part 51b is provided so as to protrude to the other side in the radial direction Dr from the middle part 51c of the first housing part 51a, but it may be configured in any way. As a modification example, the second housing part 51b may be provided so as to protrude to the other side in the radial direction Dr from a position shifted to either one side in the vertical direction with respect to the middle part 51c of the first housing part 51a.

[0075] In one example of the above embodiment, the diaphragm 62 is integrally formed with the valve body 61, but it may be configured in any way. As a modification example, the diaphragm 62 may be separate from the valve body 61.

[0076] In one example of the above embodiment, the strainer 111 is provided in the pressurization line 110, but it may be configured in any way. As a modification example, the strainer 111 may be omitted in the pressurization line 110.

[0077] <Other embodiments> As described above, the embodiments of the present disclosure have been explained. However, these embodiments are shown as examples and are not intended to limit the scope of the present disclosure. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the present disclosure. These embodiments and their modifications are to be included in the scope of the present disclosure as well as in the scope equivalent to that of the present disclosure.

[0078] <Supplementary Note> The pumping and re-injecting unit 50, the pumping and re-injecting control system 1, and the ground source heat utilization system 9 described in each embodiment are understood as follows, for example.

[0079] (1) The pumping and re-injecting unit 50 according to the first aspect includes a housing 51 having a flow path 55 through which water pumped from the well 2 and water re-injected into the well 2 flow, and a branch flow path 56, a first flange 52 provided at the first end 51s of the housing 51 and having an opening 55d on one end side of the flow path 55, a second flange 53 provided at the second end 51t of the housing 51 and having an opening 55e on the other end side of the flow path 55, and a water injection valve mechanism 60 capable of opening and closing the branch flow path 56. The branch flow path 56 branches from the flow path 55 inside the housing 51 and communicates with the outside of the housing 51, and the water injection valve mechanism 60 is accommodated in a region A having a circumferential surface that is a surface connecting the outer circumferences 52s of the first flange 52 and 53s of the second flange 53.

[0080] In this pumping and re-injecting unit 50, since the water injection valve mechanism 60 is accommodated in the region A having a circumferential surface that is a surface connecting the outer circumferences 52s of the first flange 52 and 53s of the second flange 53, it is possible to suppress the water injection valve mechanism 60 from protruding outward beyond the first flange 52 and the second flange 53. Thereby, when inserting and removing the pumping and re-injecting unit 50 into and from the inside of the well 2, it is possible to suppress the water injection valve mechanism 60 from interfering with the inner surface of the well 2. Therefore, it is possible to provide a pumping and re-injecting unit 50 that can be easily inserted into and removed from the inside of the well 2.

[0081] (2) The water pumping and returning unit 50 according to the second aspect is the water pumping and returning unit 50 of (1), wherein the water injection valve mechanism 60 includes a valve body 61 capable of opening and closing the branch flow path 56, a diaphragm 62 that can be elastically deformed in the opening and closing direction of the valve body 61 and is connected to the valve body 61, and a diaphragm chamber 67 to which pressure for driving the diaphragm 62 in the opening and closing direction is supplied from a pilot mechanism 100 outside the housing 51.

[0082] According to this aspect, by supplying pressure from the pilot mechanism 100 to the diaphragm chamber 67, the diaphragm 62 connected to the valve body 61 is elastically deformed, and the valve body 61 is driven in the opening and closing direction. Thereby, the branch flow path 56 can be opened and closed by the valve body 61. When the branch flow path 56 is opened by the valve body 61, the water flowing in the flow path 55 is discharged from the branch flow path 56 to the outside of the housing 51, and water can be injected into the well 2 when returning water to the well 2.

[0083] (3) The water pumping and returning unit 50 according to the third aspect is the water pumping and returning unit 50 of (2), wherein the diaphragm chamber 67 has a water injection port 68 through which water can be injected into the diaphragm chamber 67 from the pilot mechanism 100, and a drain port 69 through which water can be drained from the diaphragm chamber 67 to the pilot mechanism 100.

[0084] According to this aspect, by injecting water into the diaphragm chamber 67 through the water injection port 68 from the pilot mechanism 100, the inside of the diaphragm chamber 67 can be pressurized, and the valve body 61 can be driven in the closing direction. Also, by draining water from the diaphragm chamber 67 to the pilot mechanism 100 through the drain port, the inside of the diaphragm chamber 67 can be depressurized, and the valve body 61 can be actuated in the opening direction.

[0085] (4) The water pumping and returning unit 50 according to the fourth aspect is the water pumping and returning unit 50 of (2) or (3), and further includes a guide mechanism 64 that is connected to the valve body 61 and guides the valve body 61 so that the valve body 61 moves in the extending direction C of the branch flow path 56.

[0086] According to this aspect, by guiding the valve body 61 with the guide mechanism 64, the valve body 61 can be stably moved in the extending direction C of the branch flow path 56.

[0087] (5) The pumping and water return unit 50 according to the fifth aspect is the pumping and water return unit 50 according to any one of (1) to (4), wherein the branch flow path 56 is formed to extend in the radial direction Dr of the housing 51 that intersects the direction connecting the first end 51s and the second end 51t of the housing 51 from the flow path 55, and the water injection valve mechanism 60 is provided at the end of the flow path on the outer side of the radial direction Dr in the branch flow path 56.

[0088] According to this aspect, by forming the branch flow path 56 to extend in the radial direction Dr of the housing 51 from the flow path 55 and providing the water injection valve mechanism 60 at the end of the flow path of the branch flow path 56, it is easy to layout the water injection valve mechanism 60 so as to be accommodated in the region A having the surface connecting the outer periphery 52s of the first flange 52 and the outer periphery 53s of the second flange 53 as the circumferential surface.

[0089] (6) The pumping and water return unit 50 according to the sixth aspect is the pumping and water return unit 50 according to (5), wherein the housing 51 includes a housing first part 51a that extends in the direction connecting the first end 51s and the second end 51t and has the flow path 55 formed therein, and a housing second part 51b that protrudes outward in the radial direction Dr from the outer peripheral surface 51f of the housing first part 51a and has the branch flow path 56 formed therein, and further has a communication port 57 formed in the housing second part 51b that communicates the inside of the branch flow path 56 and the outside of the housing 51 when the branch flow path 56 is opened by the water injection valve mechanism 60.

[0090] According to this aspect, by forming the communication port 57 in the housing second part 51b that protrudes outward in the radial direction Dr from the outer peripheral surface 51f of the housing first part 51a, it is easy to ensure a large opening area of the communication port 57. Therefore, the water flowing from the flow path 55 into the branch flow path 56 can be efficiently injected into the well 2 through the communication port 57.

[0091] (7) The pumping and water return unit 50 according to the seventh aspect is any one of the pumping and water return units 50 from (1) to (6), and the region A has an outer diameter of 315 mm or less.

[0092] According to this aspect, by setting the region A having a circumferential surface formed by connecting the outer periphery 52s of the first flange 52 and the outer periphery 53s of the second flange 53 to have an outer diameter of 315 mm or less, it is possible to easily insert and remove the pumping and water return unit 50 into and from the well 2 even in a well 2 with a small inner diameter. As a result, it is also possible to reduce the diameter of the well 2.

[0093] (8) The pumping and water return control system 1 according to the eighth aspect includes any one of the pumping and water return units 50 from (1) to (7), and a pilot mechanism 100 provided outside the housing 51 for supplying a pressure that drives the water injection valve mechanism 60 in the opening and closing direction by supplying and discharging water to and from the water injection valve mechanism 60.

[0094] According to this aspect, since the water injection valve mechanism 60 driven in the opening and closing direction by the pilot mechanism 100 is contained within the region A having a circumferential surface formed by connecting the outer periphery 52s of the first flange 52 and the outer periphery 53s of the second flange 53, it is possible to prevent the water injection valve mechanism 60 from protruding outward beyond the first flange 52 and the second flange 53. As a result, when inserting and removing the pumping and water return unit 50 into and from the well 2, it is possible to prevent the water injection valve mechanism 60 from interfering with the inner surface of the well 2. Therefore, it is possible to provide a pumping and water return control system 1 including a pumping and water return unit 50 that can be easily inserted and removed into and from the well 2.

[0095] (9) The pumping and water return control system 1 according to the ninth aspect is the pumping and water return control system 1 of (8), wherein the pilot mechanism 100 is provided by branching from the main pipe 3 connected to the first flange 52, and by introducing a part of the water flowing through the main pipe 3, a pressurizing line 110 that applies pressure to the water injection valve mechanism 60 in a direction to close the water injection valve mechanism 60, a pilot valve 112 provided in the pressurizing line 110 that discharges the water in the pressurizing line 110 to the outside of the pressurizing line 110 when the pressure in the pressurizing line 110 becomes equal to or higher than a set pressure, thereby releasing the pressure in the pressurizing line 110, and a register 113 provided in the pressurizing line 110 that adjusts the change in the flow rate of the water in the pressurizing line 110 when the pressure in the pressurizing line 110 is released by the pilot valve 112.

[0096] According to this aspect, when the pressure in the pressurizing line 110 becomes equal to or higher than the set pressure, the pilot valve 112 can appropriately adjust the pressure applied to the water injection valve mechanism 60 by releasing the pressure in the pressurizing line 110. Further, when the pressure in the pressurizing line 110 is released by the pilot valve 112, the register 113 can suppress the sudden fluctuation of the pressure applied from the pilot mechanism 100 to the water injection valve mechanism 60 by adjusting the change in the flow rate of the water in the pressurizing line 110. Thereby, the water injection valve mechanism 60 can be smoothly opened and closed, and the occurrence of the water hammer phenomenon can be suppressed.

[0097] (10) The pumping and water return control system 1 according to the tenth aspect is the pumping and water return control system 1 of (8) or (9), wherein the pilot mechanism 100 includes a decompression line 120 that reduces the pressure applied to the water injection valve mechanism 60 by discharging water from the water injection valve mechanism 60 when opening the water injection valve mechanism 60, a solenoid valve 121 that opens and closes the decompression line 120, and an orifice 122 provided upstream of the solenoid valve 121 in the decompression line 120 that restricts the flow rate of the water flowing through the decompression line 120.

[0098] According to this aspect, by opening the pressure reducing line 120 with the solenoid valve 121, the pressure applied to the water injection valve mechanism 60 in the pressure reducing line 120 can be reduced, and the water injection valve mechanism 60 can be opened. In this case, by providing an orifice 122 for restricting the flow rate of the water flowing in the pressure reducing line 120 on the upstream side of the solenoid valve 121, the amount of water in the pressure reducing line 120 when the solenoid valve 121 opens and closes can be appropriately adjusted, and the operation of the water injection valve mechanism 60 can be stabilized.

[0099] (11) The ground source heat utilization system 9 according to the eleventh aspect includes any one of the pumping and water return control systems 1 from (8) to (10), a main pipe 3 connected to the first flange 52, a pump 5 enabling pumping into the main pipe 3, a check valve 6 provided between the second flange 53 and the pump 5, a well 2, and a heat exchanger 4 that exchanges heat with the main pipe 3.

[0100] According to this ground source heat utilization system 9, it is possible to provide a ground source heat utilization system 9 configured using a pumping and water return unit 50 that can easily insert and remove into the well 2.

Description of reference numerals

[0101] 1... Pumping and water return control system 2... Well 21... Hot water well 22... Cold water well 2a... Casing 2b... Slit 3... Main pipe 4... Heat exchanger 5... Pump 6... Check valve 9... Ground source heat utilization system 50... Pumping and water return unit 51... Housing 51a... First part of the housing 51b... Second part of the housing 51c... Intermediate part 51f... Outer peripheral surface 51g... First cylindrical part 51h... Second cylindrical part 51p... Guide cylindrical part 51r… Flange 51s… First end 51t… Second end 52… First flange 52s… Outer circumference 53… Second flange 53s… Outer circumference 55… Flow path 55c… Middle part of the flow path 55d… Opening 55e… Opening 55s… First end of the flow path 55t… Second end of the flow path 56… Branch flow path 56d… Opening 57… Communication port 60… Water injection valve mechanism 61… Valve body 61p… Reinforcing plate 61s… Seating surface 62… Diaphragm 63… Cover 63a… Outer peripheral part 63b… Central part 64… Guide mechanism 65… Shaft 66… Guide wing 67… Diaphragm chamber 68… Water injection port 69… Drain port 100… Pilot mechanism 110… Pressure line 111… Strainer 112… Pilot valve 112s… Pressure detection part 113… Register 114… Drain line 120… Pressure reducing line 121… Solenoid valve 122… Orifice A… Region C… Extension direction Dr… Radial direction H… Clearance HOL… Excavation hole LY… Aquifer OG… Ground surface S… Space

Claims

1. A housing having a flow path through which pumped water from a well and return water to the well flows and a branch flow path; a first flange provided at a first end of the housing and having an opening on one end side of the flow path; a second flange provided at a second end of the housing and having an opening on the other end side of the flow passage; a water injection valve mechanism capable of opening and closing the branch flow path; Equipped with the branch flow passage branches off from the flow passage within the housing and communicates with the outside of the housing; The water injection valve mechanism is contained within a region defined by a surface connecting the outer periphery of the first flange and the outer periphery of the second flange. Pump and return unit.

2. The water injection valve mechanism is a valve body capable of opening and closing the branch flow path; a diaphragm that is elastically deformable in an opening and closing direction of the valve body and is connected to the valve body; a diaphragm chamber to which pressure is supplied from a pilot mechanism outside the housing to drive the diaphragm in the opening and closing directions. The pump-and-return unit according to claim 1.

3. The diaphragm chamber is a water inlet capable of injecting water into the diaphragm chamber from the pilot mechanism; a drain port through which water can be discharged from within the diaphragm chamber to the pilot mechanism. The pumping and returning unit according to claim 2.

4. The valve body further includes a guide mechanism that is connected to the valve body and guides the valve body so that the valve body moves in the extension direction of the branch flow path. A pumping and returning water unit according to claim 2 or 3.

5. The branch flow passage is formed to extend from the flow passage in a radial direction of the housing intersecting a direction connecting the first end and the second end of the housing, The water injection valve mechanism is provided at an outer flow path end in the radial direction in the branch flow path. A pumping and returning water unit according to claim 1 or 2.

6. The housing includes: a housing first portion extending in a direction connecting the first end and the second end, the housing first portion having the flow passage formed therein; a housing second portion protruding radially outward from an outer circumferential surface of the housing first portion and having the branch flow path formed therein, The second housing portion further includes a communication port that communicates between the inside of the branch passage and the outside of the housing when the branch passage is opened by the water injection valve mechanism. The pumping and returning unit according to claim 5.

7. The area has an outer diameter of 315 mm or less. A pumping and returning water unit according to claim 1 or 2.

8. The water pumping and returning unit according to claim 1 ; a pilot mechanism provided outside the housing for supplying water to and discharging water from the water inlet valve mechanism to supply pressure for driving the water inlet valve mechanism in the opening and closing directions; Equipped with Pumped water return control system.

9. The pilot mechanism is a pressure line that is branched off from a main pipe connected to the first flange and that applies pressure to the water injection valve mechanism in a direction in which the water injection valve mechanism closes by introducing a portion of the water flowing through the main pipe; a pilot valve provided in the pressurized line, the pilot valve being capable of releasing the pressure in the pressurized line by discharging water in the pressurized line to the outside of the pressurized line when the pressure in the pressurized line becomes equal to or higher than a set pressure; a resistor provided in the pressurized line and configured to adjust a change in the flow rate of the water in the pressurized line when the pressure in the pressurized line is released by the pilot valve. The pumping and returning water control system according to claim 8.

10. The pilot mechanism is a pressure reducing line for reducing a pressure applied to the water inlet valve mechanism by draining water from the water inlet valve mechanism when the water inlet valve mechanism is opened; an electromagnetic valve for opening and closing the pressure reduction line; an orifice provided in the pressure reduction line upstream of the solenoid valve for throttling the flow rate of water flowing through the pressure reduction line; The pumping and return water control system according to claim 8 or 9.

11. The pumping and return water control system according to claim 8 ; A main pipe connected to the first flange; A pump capable of pumping water to the main pipe; A check valve provided between the second flange and the pump; The well; a heat exchanger for exchanging heat with the main pipe; Equipped with Geothermal energy utilization system.

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