KR102604961B1 - Ensuring the safety of open geothermal wells and energy-saving geothermal system using bidirectional fluid movement - Google Patents

Abstract

The present invention is to prevent collapse or collapse phenomenon that occurs in the geothermal hole in the soft rock layer of the groundwater tube well type geothermal heat exchange device used in a general open geothermal system, a top casing is installed on the upper side, and a center pole, a center maintaining device, is installed on the lower side. After installing water-air combined input/output pipes and flotation prevention pipes that serve as groundwater suction, pumping, return water, and compressed air pipes, the surrounding areas are filled with filler to prevent the collapse of soft rock.
Inside the upper top casing, a pump housing with a built-in pump and a sliding reverse valve assembly that serves both pumping and return water is installed, and a hub with a locking device is attached to the end of the pump housing.
A sleeve is attached to the upper end of the water-air combined inlet/outlet pipe at the bottom to realize one-touch combination and disassembly, and compressed and stored material is removed without using dedicated equipment or facilities to remove foreign substances deposited in the filler space due to long-term use of the geothermal hole. By performing foreign matter removal work using air and a large amount of pumped water, and performing a large-temperature difference heat exchange operation using geothermal holes that are dormant due to changes in load,
It is about an energy-saving geothermal system that increases the stable operation of the system, convenience of construction, and energy use efficiency.

Description

Ensuring the safety of open geothermal wells and energy-saving geothermal system using bidirectional fluid movement}

The present invention prevents the collapse or collapse of the rock layer cavity wall that normally occurs during excavation or use of the system in a geothermal system using a high-depth (400m to 500m) well-type open geothermal well using groundwater, and installs and installs pumping facilities in the geothermal well. This is to save energy by configuring a water return circuit connected to an adjacent, dormant geothermal well, and to facilitate cleaning to remove foreign substances.

The underground temperature averages 15℃ at 50m below the surface throughout the four seasons and about 21℃ at 500m, and the temperature of groundwater circulating inside the geothermal hole maintains an average of 21℃ throughout the year.

When groundwater that maintains this temperature is supplied as a heat source for the heat pump through the pumping process, the heat pump exchanges heat with the indoor cooling and heating load by the refrigerant, which is a circulating medium, and continues to absorb heat during cooling or dissipate heat during heating. .

After being supplied as a heat pump heat source, groundwater whose temperature has risen or fallen due to heat absorption and heat dissipation flows into the geothermal hole, which is a ground heat exchanger, through the water exchange process, and exchanges heat with the fluid groundwater flowing through the rock and aquifer of the hole wall forming the geothermal hole. By repeating the process of restoring the temperature of groundwater to the state before pumping, continuous use of ground heat becomes possible.

In a geothermal system, a ground heat exchanger that uses geothermal wells supplies the energy source needed for heat absorption or heat dissipation required by a heat pump in the heat exchange process with cooling and heating loads, and is divided into closed and open types.

The sealed type installs a U-tube made of high-density polyethylene for heat exchange inside the geothermal hole by connecting it vertically to 150m to 200m below the ground surface, and circulates brine, a heat exchange fluid containing ethanol, to directly exchange heat with the heat pump and then circulates it. The returned brine is returned to the inside of the geothermal hole to restore heat to the state before circulation.

In the open type, similar to a general groundwater well, groundwater pumped by a water pump is indirectly heat exchanged with a heat pump, and then the returned groundwater is introduced into the geothermal well to restore heat to the state before pumping.

In the geothermal heat exchanger of a traditional open geothermal well, an inner casing made of 125 mm diameter PVC pipe is installed to the bottom with dozens of connection sockets inside the geothermal hole excavated at a diameter of 200 mm and a depth of 400 to 500 m, and some sections of the lowest section are equipped with a strainer. A perforated pipe is installed, and a pump is installed at the top of the inner casing to supply groundwater to the heat pump through the pumping pipe. The returned groundwater passes between the outside of the PVC and the bedrock, undergoes heat exchange, and is then recirculated inside the PVC through the perforated pipe. .

Another method is a construction method in cases where the installation of an internal casing is unnecessary in a geothermal hole composed of a good rock cavity wall,

A water return pipe (Ψ75mm) made of high-density polyethylene is installed to extend near the bottom of the geothermal hole, and the water pump is installed at the top, so that the returned groundwater rises to the top, heat recovery to the state before pumping, and then recirculated.

The distribution of rocks in underground rock generally forms a soil layer up to a certain depth near the ground surface, and the lower part of the soil layer is composed of weathered rock, soft rock, ordinary rock, and hard rock in that order. The types and distribution lengths of the rocks are very diverse and differ depending on the excavation location. .

Due to the type and distribution length of these rocks, the entire depth inside the geothermal hole is encased with piping made of PVC (VG1) to prevent the collapse of the soft rock layer (weathered rock or soft rock) of the hole wall during or after excavation of the geothermal hole. After carrying out reinforcement work to form a perforated pipe, a water pump was installed at a depth of 40m to 50m inside, and three PVC (VG1) water return distribution pipes with a nominal diameter of 30 were installed outside and then filled with soybean gravel filler of about Ψ4~5mm. Alternatively, full encasing work using PVC (VG1) or galvanized steel pipe is performed to prepare for rock layer collapse or collapse in advance and prevent circulation problems of returned groundwater.

After a certain period of time, if the soft porous rock layer collapses or collapses or foreign substances such as sand introduced by the aquifer fluid groundwater accumulate in the gap of about Ψ4 to 5 mm in the filler or around the water return distribution pipe or perforated pipe, causing a blockage in the groundwater flow path, the water must be returned. If part or all of the groundwater overflows the upper part of the encasing and is pumped by a water pump without heat restoration, the efficiency of the geothermal system is significantly reduced, and in severe cases, groundwater leaks to the surface may occur.

Cleaning work is necessary as a measure to prevent groundwater leakage caused by clogging caused by these accumulated foreign substances.

The cleaning work to remove sediment inside the incasing can be done by removing pumping facilities such as pumps and then using dedicated cleaning equipment to perform the role of a geothermal hole.

Cleaning work to remove deposits from the outside of the encasing and between the cavity walls or filler gaps must be done by closing the cavity as it cannot be cleaned even with dedicated cleaning equipment.

As a means to solve the problem according to the present invention,

A geothermal hole formed in a circle with an excavation depth of 400 to 500 m in the ground and a diameter of Ψ200 to 250 mm and containing a large amount of groundwater (so-called geothermal heat exchanger, which includes all internal facilities interpreted in a broad sense) (100),

A heat pump (520) that produces cold and hot heat sources necessary for indoor cooling and heating,

An indoor unit (500) that produces and supplies hot and cold air by exchanging heat with indoor air by high- and low-temperature refrigerant or cold and hot water produced by the heat pump (520),

An indoor temperature controller (500a) connected to the indoor unit (500) to control air volume or indoor temperature or control the heating and cooling operation of the heat pump (520),

A geothermal source heat exchanger (210) that exchanges heat between groundwater circulating inside the geothermal hole (100) and fluid circulating inside the heat pump (520),

A heat source circulation pump 510 that circulates fluid between the heat pump 520 and the ground source heat exchanger 210,

An upper protection hole (340) that seals the upper part of the geothermal hole (100) to prevent contamination of groundwater by preventing the inflow of contaminants on the ground,

An external casing (105) made of steel pipe that is installed from the ground surface of the geothermal hole (100) to the weathered rock layer to prevent the inflow of surface water into the soil layer,

A water pump 170 that supplies groundwater in the geothermal well 100 to the geothermal source heat exchanger 210,

A sliding check valve assembly (300) connected to the water outlet of the pump (170) and having a pumping function when the pump (170) is in operation and a combined function of water return when the pump (170) is stopped;

A pump housing (160) that houses the pump (170) and the sliding station assembly (300) and is used as a vertical movement path for groundwater when the pump (170) is operating or stopped.

It is installed from the top of the geothermal hole 100 to a certain depth below where the pump housing 160 is installed, and has a perforated pipe structure to prevent collapse or collapse occurring in the weathered rock or soft rock layer below the outer casing 105. Top casing (410) installed with PVC material,

An automatic control system 550 that performs control operations to operate and stop the water pump 170 according to an input program,

The temperature of ground water pumped or returned to the geothermal source heat exchanger 210 by the automatic control system 550 by the water pump 170 and the temperature of ground water supplied to the heat pump 520 by the heat source circulation pump 510 A heat source temperature sensor (540) that measures the temperature of the circulating fluid being discharged or discharged in real time,

A pumping pipe (219) connected to the inlet side of the ground source heat exchanger (210),

A water return pipe (220) connected to the outlet side of the ground source heat exchanger (210),

A pumping station is installed on the pumping pipe 219 at the outlet side of the pumping pump 170 and is opened by pumping pressure when the pumping pump 170 is operating and automatically closes when the pumping pump 170 is stopped. (200),

A pumping water valve (195) installed in the pumping pipe (219) to manually control the flow of groundwater flowing into the inlet of the geothermal source heat exchanger (210),

A water return valve 196 installed in the water return pipe 220 to manually control the flow of groundwater flowing into the geothermal hole 100,

A water return control valve 280 that is installed in the water return pipe 220 and serves to block water return when the pump 170 is stopped by the automatic control system 550 and pumping water is stopped.

A water exchange pipe (191) that returns the water that has passed through the water return water valve (196) to the vicinity of the water surface of the geothermal hole (100) through a pipe connected to one side of the upper protection hole (340),

A pump housing outlet (180) that combines the pump housing (160) with the positive and return water pipe (190),

It is connected to the water outlet 180 of the pump housing 160, and serves as a pumping pipe when the pump 170 is in operation. It functions as a water return pipe when the pump 170 is stopped. When compressed air is supplied, it functions as a water return pipe. A water return pipe (190) that also functions as an air inlet pipe,

A three-way electric valve that transfers the returned water that has passed through the water return index valve (196) to the water return-only pipe (191) or the positive and water return pipe (190) by switching to a valve opening under the control of the automatic control system (550). (230),

A compressed air storage tank 240 for storing compressed air for cleaning to remove foreign substances contained in groundwater flowing into the aquifer of the geothermal hole 100,

An air control valve 250 that adjusts the supply amount of compressed air stored in the compressed air storage tank 240 to the volume and water return pipe 190 when removing foreign substances from the geothermal hole 100,

It is installed at the outlet of the pump 170 inside the pump housing 160, and when the pump 170 is operated, the disk 303 rises to open the flow path, and when the pump 170 is stopped, the disk 303 ) is a reverse valve 302 that descends to close the flow path and a reverse valve cylinder 301 with a built-in cylinder spring 305;

On the upper side of the check cylinder 301, there is a water-air nozzle 310 having a circular or square shape, and the check valve 302 is operated by returning water or incoming groundwater or compressed air by switching the three-way electric valve 230. ) is lowered to discharge groundwater or compressed air into the pump housing 160 through the open water-air nozzle 310,

It is installed from the lower part of the pump housing 160 to the lowest part of the geothermal hole 100, and serves as an intake pipe for groundwater when the pumping pump 170 is in operation. A water-air combined inlet/outlet water pipe (130) made of high-density polyethylene that also serves as an outlet pipe for groundwater that is returned by switching to an electric valve (230) and an inflow pipe for compressed air for cleaning and removing foreign substances.

In order to prevent buoyancy caused by the difference in specific gravity between the high-density polyethylene pipe used as the water-air combined input/output water pipe 130 and groundwater, it is installed at the lower part of the water-air combined input/output water pipe 130 and is a porous water-air combined water pipe. A flotation prevention pipe (110) made of stainless steel having an inlet/outlet port (120),

A hub 150 attached to the lower part of the pump housing 160 and having a coupling structure that can be coupled with the water-air combined inlet/outlet pipe 130 with one touch,

A sleeve 140 attached to the upper part of the water-air combined inlet/outlet pipe 130 and having a coupling structure that can be coupled with the hub 150 with one touch,

A guide 165 that is attached to the lower part of the hub 150 and guides the sleeve 140 into the hub 150 to facilitate insertion when the hub 150 and the sleeve 140 are coupled with one touch,

A clamp 166 having a device to prevent the sleeve 140 and the hub 150 from being separated after one-touch coupling,

The sleeve 140 connected to one upper side of the water-air combined inlet and outlet water pipe 130 and the flotation prevention pipe 110 connected to one lower side of the water-air combined inlet and outlet water pipe 130 are connected to the center of the geothermal hole 100. Center pole (400), a center maintaining device for positioning,

When the water pump 170 installed in the geothermal well 100 fails, the adjacent geothermal well 100 is shut down to prevent water overflow to the ground surface caused by water return from the adjacent geothermal well 100 and to reduce the load. An overflow pipe (320) that forms a groundwater circulation flow path in series to enable large-temperature difference heat exchange,

An overflow pipe water source 330 that is installed in the overflow pipe 320 and controls the inflow of groundwater or compressed air into the adjacent geothermal hole 100 through an opening and closing operation,

In order to prevent the collapse or collapse of the soft rock beneath the top casing 410, a spherical filler made of rock material with a diameter of about Ψ25 mm is filled in the space around the flotation prevention pipe 110 and the water-air inlet/outlet pipe 130 ( 270),

A protector 420 attached to the lower part of the top casing 410 to prevent the filler 270 from rising to the top and leaking out due to bubbles of compressed air for cleaning,

As a means of solving the problem, there is a drain pipe 260 for discharging suspended substances floating between the fillers 270 to the outside of the geothermal hole 100.

As described above, the geothermal common ground heat exchanger of the open geothermal system according to the present invention,

A water return pipe is installed at the entire depth of the center of the geothermal hole below the pump installation location, and a spherical filler is filled between the water return pipe and the hole wall to prevent the soft ground of the excavation hole from collapsing and stabilize it.

The installation and maintenance of pumping facilities is easy by applying the hub-and-sleeve detachment method, and the use of large-diameter fillers reduces the occurrence of blockage of the flow path due to foreign substances deposited in the filler space. Even if flow path blockage occurs, external cleaning equipment is used. You can simply remove foreign substances using stored compressed air without removing the pumping facility.

By configuring a series circulation circuit with a geothermal well that is idle due to a decrease in load, an adjacent geothermal well in operation, and an overflow pipe, heat exchange efficiency is increased by implementing large-temperature difference heat recovery, and when a failure occurs in some water pumps, it is used as a geothermal well for water return only. Saves electrical energy by increasing utilization efficiency and minimizing the number of operating pumps.

In addition, it has the advantage of significantly reducing construction costs as it is possible to form geothermal holes by excavating a smaller diameter Ψ200mm than the excavation diameter Ψ250mm of the existing filler method.

Figure 1 is a configuration diagram of a geothermal system according to the present invention.
Figure 2 is a structural diagram of the top casing and center pole according to the present invention.
Figure 3 is an exploded and assembled view of the hub and sleeve according to the present invention.
Figure 4 is a diagram of the hub and sleeve removal according to the present invention.
Figure 5 is a structural diagram of a sliding reverse displacement assembly according to the present invention .
Figure 6 is a fluid flow diagram of a sliding reverse displacement assembly according to the present invention .

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention.

However, since the description of the present invention is only an example for structural or functional explanation, the scope of the present invention should not be construed as limited by the examples described in the text.

In other words, since the embodiments can be modified in various ways and can have various forms, the scope of rights of the present invention should be understood to include equivalents that can realize the technical idea.

In addition, the purpose or effect presented in the present invention does not mean that a specific embodiment must include all or only such effects, so the scope of the present invention should not be understood as limited thereby.

The meaning of terms described in the present invention should be understood as follows.

Terms such as “first” and “second” are used to distinguish one component from another component, and the scope of rights should not be limited by these terms.

For example, a first component may be named a second component, and similarly, the second component may also be named a first component. When a component is referred to as being “connected” to another component, it should be understood that it may be directly connected to the other component, but that other components may also exist in between.

On the other hand, when a component is referred to as being “directly connected” to another component, it should be understood that there are no other components in between.

Meanwhile, other expressions that describe the relationship between components, such as "between" and "immediately between" or "neighboring" and "directly neighboring" should be interpreted similarly.

Singular expressions should be understood to include plural expressions, unless the context clearly indicates otherwise, and terms such as “comprise” or “have” refer to the specified features, numbers, steps, operations, components, parts, or them. It is intended to specify the existence of a combination, and should be understood as not excluding in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

All terms used herein, unless otherwise defined, have the same meaning as commonly understood by a person of ordinary skill in the field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as consistent with the meaning they have in the context of the related technology, and cannot be interpreted as having an ideal or excessively formal meaning unless clearly defined in the present invention.

Hereinafter, the configuration of the preferred embodiment will be described in detail with reference to the attached drawings.

In Figure 1, a geothermal system using groundwater according to an embodiment of the present invention,

It is connected to the indoor unit 510, which produces and supplies cold and hot air by exchanging heat with the indoor load using refrigerant or cold and hot water produced by the heat pump 520, which produces and supplies the cold and hot heat sources necessary for indoor cooling and heating, and provides summer and winter cooling and heating. Perform heating.

The underground ground structure used as a geothermal hole (100) for cooling, heating, hot water supply, and constant temperature and humidity shows differences in composition depth, rock type, and composition depending on the region.

In general, the soil layer is composed of weathered rock, soft rock, ordinary rock, and hard rock in that order, and shows a good, uneven, or unstable ground structure depending on the degree of ground activity regionally.

Therefore, collapse or collapse occurs during drilling to form the geothermal hole 100 in an area with an uneven or unstable ground structure or after a certain period of time after the formation of the geothermal hole 100, thereby losing the life of the geothermal hole 100. or as a way to prevent difficulties in using the geothermal system,

A high-depth excavator that uses high-pressure compressed air to open a geothermal hole (also called a geothermal heat exchanger, broadly interpreted, including all internal facilities) (100), which is formed in a circular shape with a diameter of Ψ200mm in the ground and contains a large amount of groundwater. The drilling work is performed at an excavation depth of 400 to 500 m, which is the normal design depth.

At the beginning of the drilling work, an external casing (105) made of galvanized steel pipe with a diameter of Ψ200 mm is installed from the ground surface to the bedrock line inside the geothermal hole (100) to prevent surface water from the soil layer from flowing into the geothermal hole. Install to a depth of around 2m or more.

When installation of the external casing (105) is completed,

An upper protection hole 340 is installed to prevent contamination of groundwater by sealing the upper part of the geothermal hole 100 to prevent the inflow of contaminants from the ground surface, and the upper protection hole 340 has a structure that is completely sealed from the outside.

When the installation of the upper protection hole 340 is completed, a water-air combined inlet/output water pipe 130 made of high-density polyethylene, which performs both water pumping and water return functions through a single pipe, is installed on the lower side of the geothermal hole 100. It is installed extending to the upper part of about 20m above the lowest floor.

At this time, the extension method of high-density polyethylene pipe uses a welding method using a butt or socket using a dedicated heat splicer.

On one side of the lower part of the water-air inlet/outlet pipe 130, the buoyancy of the water-air inlet/outlet pipe 130 occurs due to the difference in specific gravity between the groundwater in the geothermal hole 100 and the water-air inlet/outlet pipe 130 made of high-density polyethylene. To prevent this, a flotation prevention pipe (110) made of stainless steel of the same standard is connected.

The flotation prevention pipe 110 has a plurality of water-air combined inlet/outlet ports 120 on the circumferential side and can be freely shaped.

On one side of the upper part of the water-air combined inlet and outlet pipe (130), an extension pipe made of stainless steel of the same standard and a certain length and a precision-processed one-touch coupling sleeve (140) are connected.

A clamp 166 is fastened to a certain position on the lower part of the sleeve 140 to ensure that the hub 150, which is connected with one touch, is inserted and seated at a certain depth, and to prevent the hub 150 inserted into the sleeve 140 from being separated. Attach and install the circular locking stopper (164).

The water-air combined inlet/outlet pipe (130) and the flotation prevention pipe (110) are anchored in the center of the geothermal hole (100) in the stainless steel pipe at the top and the flotation prevention pipe (110) at the bottom. Attach and install the center pole (400), which is a center maintaining device.

The tension spring (403) of the center pole (400) spreads the arm (401) due to the expansion force and accurately adheres to the bedrock, so that the water-air combined inlet/outlet pipe (130) and the flotation prevention pipe (110) are connected to the geothermal hole (100). be installed in the center of

After settling in the center of the geothermal hole 100 of the water-air combined inlet/outlet pipe 130 and the flotation prevention pipe 110, a spherical filler (about Ψ25mm in diameter) made of washed rock material is installed to prevent collapse or collapse of soft rock. 270) is filled in the internal space to facilitate the flow of water and minimize the accumulation of foreign substances.

The interior of the hub 150, which is one-touch coupled to the sleeve 140, is precision-processed and has a retainer 161 and multiple O-rings 163 built in to ensure perfect sealing.

A guide 165 is attached to one side of the lower part to guide the one-touch connection with the sleeve 140 to stabilize insertion.

On the outside, a clamp (166), bracket (167a), fastening pin (167b), and clamp ring (168) are attached with a ring stopper (169) to prevent the sleeve (140) and hub (150) from coming off after being fastened. and a clamping cable (168a).

A pump housing 160 is connected to one side of the upper part of the hub 150, which is installed at a location around 40m below the ground surface, and a pump housing 170 is installed on the lower side inside the pump housing 160. The pump 170 has an outlet and a sliding station. The inlet of the drain assembly (300) is connected using stainless steel connecting parts and piping.

The water outlet of the sliding station assembly (300) and the pump housing outlet (180) are connected using stainless steel connection parts and piping.

From the pump housing outlet (180) to the ground surface, a single pipe made of high-density polyethylene or stainless steel is installed, and a double and water return pipe (190) that serves both pumping and water return functions is installed.

A branch pipe is installed in the both water and water return pipe (190), and on one side, the pumping water reservoir (195) and the pumping station dam (200) are installed in series, so that when the pump (170) is pumped, groundwater flows through and stops. It prevents the groundwater pumped by other water pumps (170) from flowing back.

On the other side of the branch pipe installed in the combined water and water return pipe (190), it is connected to a three-way electric valve for water return (230) so that the groundwater returned by the other water pump (170) responds to the control command of the automatic control system (550). It plays the role of returning water to the geothermal hole 170 stopped by the switching operation.

Groundwater pumped by the pump 170 and passing through the pumping reservoir 195 and the pumping station 200 flows into the ground source heat exchanger 210 through the pumping pipe 219, and flows into the pumping reservoir 200. ) has a structure that automatically closes when the pump (170) stops, and the pump (195) has a structure that can be manually opened and closed artificially.

The groundwater obtained from one side of the geothermal source heat exchanger 210 undergoes counter-flow heat exchange with the circulating fluid (brine) obtained from the heat pump 520 and the other side of the geothermal source heat exchanger 210 by the heat source circulation pump 510. The water is extracted by carrying out .

At this time, the circulating fluid (brine) that has been received into the ground source heat exchanger 210 by the heat source circulation pump 510 and exchanged heat with groundwater goes through a process of being reacquired by the heat pump 510 and is continuously recirculated within the device.

When groundwater discharged from the ground source heat exchanger (210) flows into one side of the three-way electric valve (230) via the water return pipe (220), the water return water valve (196), and the water return control valve (280), the automatic control system ( The switching operation according to the control command of 550) allows selective inflow and return water to the water exchange-only pipe (191) or the positive and water return pipe (190), and the water return valve (196) has a structure that can be artificially opened and closed manually.

The return water flowing into the water return pipe (191) descends, exchanges heat with the bedrock of the geothermal hole (100), performs heat restoration in a pumped state, and then flows into the water-air combined outlet (120) of the flotation prevention pipe (110). Afterwards, the pumping process is continuously performed by sucking water into the suction port of the pump (170) inside the pump housing (160) and recirculating it through the water-air combined water discharge pipe (130) and the hub and sleeve (150, 140).

Groundwater returned to the water/water return pipe (190) is flowed into the pump housing (160) by operating the sliding reverse pressure assembly (300) by the return pressure, and then flows into the water-air combined inlet/output pipe (130) and the flotation prevention pipe. The water is returned to the inside of the geothermal hole 100 through the water-air combined inlet/outlet port 120 of (110), rises to the top, exchanges heat with the bedrock of the geothermal hole 100, and performs heat restoration to the pumped state.

At this time, the reversing disc 303 in the sliding reversing assembly 300 is closed, the cylinder spring 305 is compressed, the reversing lever 302 is lowered, and the water-air nozzle 310 is opened.

If the cavity wall of the geothermal hole (100) at the top of the center pole (400), which is a center maintaining device installed at the top of the water-air combined inlet/outlet pipe (130), is weak, a top casing (140) in the shape of a perforated pipe made of Ψ150 mm PVC is used. It is installed to the top of the area to prevent the collapse of the hole wall or to prevent fine foreign matter from entering the geothermal hole 100 due to collapse.

The protector 420, which has a disk-shaped pore, is fastened with a fastening bolt to prevent the filler 270 filled in the lower part from floating and leaking out when removing foreign substances from the geothermal hole 100.

The branch pipe of the dual and water return pipe 190 is equipped with a foreign matter removal device to remove foreign matter deposited in the space between the fillers 270 or attached to the hole wall by groundwater flowing in through the aquifer during long-term use of the geothermal hole 100. Connect and install the compressed air storage tank (240) and the air control valve (250).

Foreign matter is discharged between the filler 270 or the wall of the hole using compressed air, or foreign matter floating by a large amount of ground water is discharged to the outside of the geothermal hole 100 using the drain pipe 260.

At this time, the compressed air storage tank 240 includes a compression device that compresses, produces, and supplies air.

It includes a heat source temperature sensor 540 that measures the temperature of the fluid (brine) circulating between the ground source heat exchanger 210 and the heat pump 520 in real time and operates or stops the water pump 170.

Overflow pipes 320 are installed between the plurality of geothermal wells 100, so that when the pump 170 fails, the water level rising due to the inflow and return of the operating geothermal wells 100 reaches the ground surface through the upper protection hole 340. An overflow pipe (320) is provided to prevent leakage into and bypass the adjacent geothermal hole (100).

Each overflow pipe 320 has a structure including an overflow pipe water valve 330 to prevent foreign matter from flowing out into the adjacent geothermal hole 100 when removing foreign matter from the geothermal hole 100.

In more detail

In the top casing in Figure 2 One embodiment of this is,

Collapse or collapse that occurs in the geothermal hole (100) in the soft rock layer on the lower side of the center pole (400), which is a center maintaining device attached to the water-air combined inlet/outlet pipe (130), can be prevented by filling with filler (270).

As a measure against collapse or collapse occurring in the geothermal hole 100 of the soft rock layer on the upper side of the center pole 400,

A top casing (410) made of PVC of a diameter capable of inserting a pump housing (160) with a built-in pump housing (160) and a sliding station assembly (300) installed at 40 to 50 m below the ground surface is installed at the upper part of the unstable soft rock layer section. By installing it to a certain height, it is possible to implement a geothermal hole (100) with a stable structure.

If the upper rock layer where the upper center pole 400 is installed shows a stable geological condition, the top casing 410 may not be installed.

The top casing 410 can be manufactured and installed in a structure in which a perforated pipe, which is a groundwater inlet and outlet passage, is installed.

One embodiment of the center pole and protect in Figure 2,

The center pole 400, which is a center maintaining device for fixing the water-air combined inlet/outlet pipe 130 and the flotation prevention pipe 110 installed inside the geothermal hole 100 to the center of the geothermal hole 100, is bent. It is manufactured as a bracket 404 that is bent into a U shape and has a processing hole of a certain diameter.

The arm 401, which has a certain thickness and slope and is manufactured with a machined hole of a certain diameter, is inserted into a machined hole for coupling the bracket 404 and the arm 401 to each other and is fixed with the shaft 403,

An expansion spring (403) is attached to accurately adhere the arm (401) to the rock wall of the geothermal hole (100), and three or more are attached to the pipe by TIG welding to maintain an angle of 120 degrees.

The center pole 400 serves to ensure that the water-air combined inlet/outlet pipe 130 and the flotation prevention pipe 110 are accurately anchored to the center of the geothermal hole 100.

Once the installation of the water-air combined inlet/outlet pipe (130) with the center pole (400) attached to the lower and upper floating prevention pipe (110) and sleeve (140) is completed,

Between the cavity wall of the geothermal hole (100), the flotation prevention pipe (110), and the water-air combined inlet/outlet pipe (130), a spherical filler (270) with a diameter of approximately Ψ25 mm is injected to the vicinity of the upper center pole (400) to fill it.

When filling with the filler (270) is completed, a porous disc-shaped protector (420) is attached to the top of the water-air combined inlet/outlet pipe (130) on which the center pole (400) is installed, using PVC and bolts, etc., to the top casing (410). Fasten and install,

It prevents the filler 270 from floating due to external factors (air bubbles in compressed air or removal of foreign substances caused by a large amount of returned water).

If the rock condition on the upper side of the center pole 400 is good and installation of the top casing 410 is unnecessary, it can be installed directly on the outside of the guide 165 by fixing it by welding or other methods.

3 and 4 to hub and sleeve One embodiment of this is,

The coupling of the upper side of the water-air combined inlet/output pipe (130) and the lower side of the pump housing (160) uses a hub-and-sleeve coupling method in which they are inserted by sliding each other and can be coupled with one touch.

The hub and sleeve one-touch coupling method fastens a sleeve (140) with a precisely machined outer surface to one upper side of the water-air combined inlet/outlet pipe (130), and to one side of the lower part of the pump housing (160) to be coupled with the sleeve (140). The hub 150, the inner surface of which has been processed, is fastened.

A reducing-shaped guide 165 is attached to one lower side of the hub 150, so that when the sleeve 140 and the hub 150 are combined, the sleeve 140 is easily inserted into the hub 150 and plays a guiding role. Prevents foreign substances from adhering to or depositing near the joint.

O-rings (163) are attached to the plurality of O-ring grooves (163g) machined inside the hub 150 to primarily prevent leakage of groundwater or compressed air through the water-air combined inlet/outlet pipe (130).

Insert the retainer 161 in the lower part and tighten it with the fastening nut 162 to prevent secondary leakage. The retainer 161 in contact with the sleeve 140 has a double-wing structure to prevent leakage even when internal and external pressure changes.

A locking stopper 164 is attached to the lower part of the sleeve 140 so that the sleeve 140 is always inserted into the hub 150 at a certain depth when combining the hub and sleeve.

After the hub 150 is inserted and installed into the sleeve 140, in order to prevent the hub 150 and the sleeve 140 from being separated from each other due to abnormal pressure changes, an S-shaped wing structure is installed on the outside of the hub 150 with a certain diameter. The clamp 166 having a pinhole is fastened to the U-shaped bracket 167a with a fastening pin 167b and then attached by welding.

The guide 165 attached to the hub 150 has a rectangular groove of a certain size for the lower wing of the clamp 166 to move to be caught or released from the locking stopper 164.

In order to ensure that the hub 150 is accurately seated on the sleeve 140 by the locking stopper 164 or to prevent it from being separated from the sleeve 140 due to pressure changes, a clamp is manufactured in a circular ring shape on the outside of the clamp 166. A ring 168 is provided and installed.

Attached to the clamp ring 168 is a clamp ring cable 168a that extends to the ground and moves up and down. When the clamp ring 168 moves downward by the clamp ring cable 168a moving up and down, the lower wing of the clamp 166 is retracted inward so that it is accurately fastened to the lower part of the locking stopper 164.

A ring stopper 169 is attached to the rear of the clamp 166 to prevent the clamp ring 168 from being separated from the clamp 166.

When the clamp ring 168 moves upward by the clamp ring cable 168a moving up and down, the upper wing of the clamp 166 contracts inward and the lower wing expands outward by the fastening pin 167b.

At this time, the fastened sleeve 140 and hub 150 have a structure in which they can be separated from each other.

When the clamp ring 168 moves downward by the clamp ring cable 168a, the lower wing of the clamp 166 contracts inward and the sleeve 140 and hub ( 150) ensures that the structures are inseparable from each other.

One embodiment of the sliding reverse displacement assembly in FIGS. 1, 5, and 6 is,

The reverse displacement cylinder 301 of the sliding reverse displacement assembly 300 has a cylindrical cylinder structure and has an inlet 306 at the bottom through which groundwater is received,

The upper cover has a water-air inlet and outlet (309) for the inflow and outflow of groundwater and inflow of compressed air.

The reverse displacement cylinder 301 and the upper cover are coupled by tightening bolts.

The upper side of the reverse displacement cylinder 301 is composed of a plurality of water-air nozzles 310 having a circular or square shape.

Inside the reverse valve cylinder 301, a reverse valve 302 that moves and slides up and down due to the pressure difference caused by pumping or returning groundwater and supplying compressed air is inserted and installed.

A disk 303 that is inserted and installed inside the backstop 302 and is opened by pumping pressure when the pump 170 is in operation and closed when the pump 170 is stopped or water is returned from another geothermal well or compressed air is introduced. is inserted and installed.

A disc spring 304 is installed on the top of the disc 303 to close the disc 303 by an expansion force. A cylinder spring 305 is installed between the lower bottom of the reverse valve cylinder 301 and the reverse valve 302, which always floats the reverse valve 302 to the upper cover side by the expansion force of the spring and closes the water-air nozzle 310. do.

The ground water pumped by the operation of the pump 170 opens the disk 303 in the reverse valve 302 of the sliding reverse valve assembly 300 with pumping pressure, and then flows through the water-air inlet/outlet port 309 and the pump housing outlet ( 180) and the water return pipe 190 and the water return pipe 219, it is received into the geothermal source heat exchanger 210, performs a heat exchange function, and is returned to the geothermal hole 100.

When the operation of the pump 170 is stopped, the disk 303 is closed by the expansion force of the disk spring 304 to prevent the pumped groundwater from flowing back into the pump 170.

The groundwater pumped by the water pump 170 performs a heat exchange function in the ground source heat exchanger 210, and then is transferred to the water exchange pipe 191 by the switching operation of the three-way electric valve 230 installed in the water return pipe 220. It is returned to the geothermal hole (100) through

Another example is,

Groundwater returned by the switching operation of the three-way electric valve (230) installed in the water return pipe (220) slides through the dual/water return pipe (190), the pump housing outlet (180), and the water-air inlet/outlet outlet (309). When the water flows into the upper part of the reverse valve 302 of the reverse valve assembly 300, the cylinder spring 305 is compressed by the water return pressure and the reverse valve 302 moves to the bottom. When the water-air nozzle 310 is opened, the water return is released. Groundwater is returned to the geothermal hole 100 through the space between the pump housing 160 and the water pump 170, the water-air combined input and output pipe 130, and the flotation prevention pipe 110.

In Figure 1, an example of removing foreign substances from a geothermal hole is,

A method of using compressed air in the compressed air storage tank 240 to remove fine sediments contained in the aquifer fluid groundwater and deposited on the filler 270 due to collapse or collapse in the soft rock of the geothermal hole 100,

The pump 170 of the geothermal well 100, which requires removal of foreign substances, is stopped, and the overflow pipe connected to the pumping water valve 195, which blocks pumping water, and the water return water valve 196, which blocks water return, and the adjacent geothermal well 100. The overflow pipe waterside (330) of (320) is completely closed and the drain pipe (260) is opened.

Afterwards, when the air control valve 250 installed in the compressed air storage tank 240, which stores high-pressure compressed air, is opened, the compressed air flows through the positive and water return pipe 190, which performs pumping and water return through a single pipe. It flows into the outlet 309 of the sliding station assembly 300.

When the compressed air compresses the cylinder spring 305 with pressurized air while the disk 303 is closed by the expansion force of the disk spring 304, the reverse lever 302 moves the reverse lever cylinder 301 downward.

When the reverse cylinder 301 is moved downward, the plurality of water-air nozzles 310 are opened to secure a passage for the compressed air to move.

Compressed air passing through the water-air nozzle (310) is inside the pump housing (160) containing the positive water pump (170), the outlet port (309) of the sliding reverse valve assembly (300), the inlet port of the pump housing (160), and the hub and After flowing into the sleeve coupling devices (150, 140), the water-air inlet/outlet pipe (130), and the flotation prevention pipe (110), it is ejected into the space of the filler (270) through a plurality of water-air inlet/outlet ports (120).

The ejected compressed air expands and floats to the top together with foreign substances deposited in the space of the filler 270 in the form of bubbles, and then discharges them to the outside of the geothermal hole 100 through the drain pipe 260 to remove foreign substances.

When removal of foreign substances is completed, the closed or open valve returns to its normal position.

In Figure 1, an example of utilizing the large temperature difference of a geothermal hole is,

During cooling and heating operation, the indoor temperature controller 500a connected to the indoor unit 500 performs a stop operation on some of the plurality of heat pumps 520 when the indoor temperature reaches the set temperature.

If the indoor temperature is outside the temperature difference within the set temperature range set in the indoor unit 500, the indoor temperature controller 500a restarts the operation of the stopped heat pump 520.

The return temperature of the fluid (brine) or groundwater circulating between the heat pump 520 and the ground source heat exchanger 210 or the ground source heat exchanger 210 and the pump 170 increases during cooling as the cooling and heating load increases or decreases. It repeats lowering and lowering, and repeats lowering and rising during heating.

The rise and fall of temperature is measured in real time by the heat source temperature sensor 540 installed in the inlet and outlet pipes of the geothermal source heat exchanger 210, respectively, and the measured temperature data is transmitted to the PCB of the automatic control system 550. When transmitted, the PCB compares the pre-input control value and operates or stops the water pump 170 or the heat source circulation pump 510 installed inside the geothermal hole 100.

We would like to suggest a method of utilizing the geothermal well 100 according to the operation and stop of the pump 170.

The circulation path of groundwater in a general geothermal system is that when the pump (170) is operated, the pumped groundwater passes through the pumping reservoir (195) and the pumping station (200) and is joined in the pumping pipe (219) to the geothermal source heat exchanger ( 210), when it is discharged after going through a heat exchange process, it is supplied through the water return index valve (196) and the water return control valve (280) installed in the water return pipe (191) of the geothermal hole (100) being pumped connected to the water return pipe (220). The process of returning water to the water surface of the lacuna 100 is repeated.

If the pump (170) in pumping malfunctions and stops, and the pumping pump (170) stops pumping water, the level of groundwater rises due to the continuous inflow of groundwater returned by the pump (170) in normal operation, causing an overflow phenomenon where groundwater overflows to the ground surface. causes

In order to prevent this phenomenon of overflow to the ground surface, an overflow pipe 320 and an overflow pipe water source 330 of a pipe diameter of a certain standard or more are connected and installed between the geothermal wells 100 to allow the reclaimed groundwater to flow to each other.

Here, we would like to present a large-temperature difference heat exchange method that utilizes groundwater that is overflowed and distributed due to the rise in water level.

When the pumping pump (170) is stopped due to the load during operation of the geothermal system and the pumping water is stopped, the pumping force (200) installed between the pumping pipe (219) and the pumping and return pipe (190) is affected by the expansion force of the spring and the self-weight of the disk. and is automatically closed by the pumping pressure of the operating geothermal well.

At this time, the water return opening of the three-way electric valve (230) installed in the water return pipe (220) is switched in the direction of the positive and water return pipe (190) by the PCB of the automatic control system (550) and flows through the water return pipe (190). The inflow of groundwater that has been returned to the surface of the hole 100 is blocked and flows into the sliding reverse discharge assembly 300 through the combined water and water return pipe 190 and the pump housing outlet 180.

Groundwater that flows into the reverse displacement cylinder (301) through the water-air inlet and outlet (309) of the sliding reverse displacement assembly (300) is returned to the disk (303) by the return pressure, the self-weight of the disk (303), and the expansion force of the disk spring (304). ) is completely closed.

At this time, the force acting on the upper part of the reversing cylinder 301 is the cylinder spring (which is installed at the lower part of the reversing cylinder 301) and raises the reversing valve 302 to the upper part of the reversing cylinder 301 when the pump 170 stops. Since it is greater than the expansion force of 305), the reverse cylinder 301 is lowered and the water-air nozzle 310 is opened.

When the water-air nozzle 310 is opened, groundwater returned through the water and water return pipe 190 flows into the pump housing 160 and then flows into the hub 150 and sleeve 140 and the water-air combined inlet and outlet pipe. It is discharged into the resting geothermal hole (100) through the water-air inlet/outlet port (120) of (130) and the flotation prevention pipe (110).

The groundwater flowing into the geothermal hole 100 rises in the direction of the upper protection hole 340 installed on the ground surface, goes through a primary heat exchange process with the rock layer, filler material, and flowing groundwater in the aquifer, raises the water level, and then flows into the adjacent operating geothermal hole ( It descends to the surface of the geothermal hole (100) via the overflow pipe (320) and the overflow pipe waterside (330) connected to 100).

The descending groundwater goes through a secondary heat exchange process with the flowing groundwater of the bedrock layer, filler, and aquifer, is restored to its original state, and then flows into the flotation prevention pipe (110) through the water-air combined inlet/outlet port (120). It flows into the pump housing 160 via the air combined input/output pipe 130, sleeve 140, and hub 150.

Groundwater flowing into the pump housing 160 undergoes a pumping process in which it is sucked in and discharged by the pump 170, and a circulation process in which it is discharged and returned to the pump and water return pipe 190.

It is possible to implement a two-circulation system of downward circulation (top-down) cycle and upward circulation (bottom-up) cycle of groundwater within the geothermal hole 100.

The large temperature difference (dt) heat recovery operation using a two-circulation system of downward circulation (top-down) cycle and upward circulation (bottom-up) cycle with one geothermal hole (100) is

Compared to the general heat recovery operation that is applied by selecting either the existing downward circulation (top-down) cycle or the upward circulation (bottom-up) cycle, the power required for the pump can be reduced by increasing the efficiency of geothermal source energy use.

100: Geothermal hole 130: Water-air combined inlet/outlet pipe
140: sleeve 150: hub
160: Pump housing 170: Pumping pump
190: Amniotic fluid pipe 219: Amniotic fluid pipe
220: water return pipe 230: three-way electric valve
270: Filler 300: Sliding reverse load assembly
320: Overflow pipe 340: Upper protection hole
400: Center pole 410: Top casing
500: indoor unit 520: heat pump
550: Automatic control system

Claims (9)

A geothermal hole (100), which is formed in a circular shape by deep excavation in the ground and contains a large amount of groundwater,
A heat pump (520) that produces cold and hot heat sources necessary for indoor cooling and heating,
An indoor unit (500) that produces and supplies hot and cold air by exchanging heat with indoor air by high- and low-temperature refrigerant or cold and hot water produced by the heat pump (520),
An indoor temperature controller (500a) connected to the indoor unit (500) to control air volume or indoor temperature or control the heating and cooling operation of the heat pump (520),
A geothermal source heat exchanger (210) that exchanges heat between groundwater circulating inside the geothermal hole (100) and fluid circulating inside the heat pump (520),
A heat source circulation pump 510 that circulates fluid between the heat pump 520 and the ground source heat exchanger 210,
An upper protection hole (340) that seals the upper part of the geothermal hole (100) to prevent contamination of groundwater by preventing the inflow of contaminants on the ground,
An external casing (105) made of steel pipe that is installed from the ground surface of the geothermal hole (100) to the weathered rock layer to prevent the inflow of surface water into the soil layer,
A water pump 170 that supplies groundwater in the geothermal well 100 to the geothermal source heat exchanger 210,
A sliding reverse valve assembly (300) connected to the water outlet of the pump (170) and having a pumping function when the pump (170) is in operation and a combined function of water return when the pump (170) is stopped;
A pump housing (160) that houses the pump (170) and the sliding station assembly (300) and is used as a vertical movement path for groundwater when the pump (170) is operating or stopped.
It is installed from the top of the geothermal hole 100 to a certain depth below where the pump housing 160 is installed, and has a perforated pipe structure to prevent collapse or collapse occurring in the weathered rock or soft rock layer below the outer casing 105. Top casing (410) installed with PVC material,
An automatic control system 550 that performs control operations to operate and stop the water pump 170 according to an input program,
The temperature of ground water pumped or returned to the geothermal source heat exchanger 210 by the automatic control system 550 by the water pump 170 and the temperature of ground water supplied to the heat pump 520 by the heat source circulation pump 510 A heat source temperature sensor (540) that measures the temperature of the circulating fluid being discharged or discharged in real time,
A pumping pipe (219) connected to the inlet side of the ground source heat exchanger (210),
A water return pipe (220) connected to the outlet side of the ground source heat exchanger (210),
A pumping station is installed on the pumping pipe 219 at the outlet side of the pumping pump 170 and is opened by pumping pressure when the pumping pump 170 is operating and automatically closes when the pumping pump 170 is stopped. (200),
A pumping water valve (195) installed in the pumping pipe (219) to manually control the flow of groundwater flowing into the inlet of the geothermal source heat exchanger (210),
A water return valve 196 installed in the water return pipe 220 to manually control the flow of groundwater flowing into the geothermal hole 100,
A water return control valve 280 that is installed in the water return pipe 220 and serves to block water return when the pump 170 is stopped by the automatic control system 550 and pumping water is stopped.
A water exchange pipe (191) that returns the water that has passed through the water return water valve (196) to the vicinity of the water surface of the geothermal hole (100) through a pipe connected to one side of the upper protection hole (340),
A pump housing outlet (180) that combines the pump housing (160) with the positive and return water pipe (190),
It is connected to the water outlet 180 of the pump housing 160, and serves as a pumping pipe when the pump 170 is in operation. It functions as a water return pipe when the pump 170 is stopped. When compressed air is supplied, it functions as a water return pipe. A water return pipe (190) that also functions as an air inlet pipe,
A three-way electric valve that transfers the returned water that has passed through the water return index valve (196) to the water return-only pipe (191) or the positive and water return pipe (190) by switching to a valve opening under the control of the automatic control system (550). (230),
A compressed air storage tank 240 for storing compressed air for cleaning to remove foreign substances contained in groundwater flowing into the aquifer of the geothermal hole 100,
An air control valve 250 that adjusts the supply amount of compressed air stored in the compressed air storage tank 240 to the volume and water return pipe 190 when removing foreign substances from the geothermal hole 100,
It is installed at the outlet of the pump 170 inside the pump housing 160, and when the pump 170 is operated, the disk 303 rises to open the flow path, and when the pump 170 is stopped, the disk 303 ) is a reverse valve 302 that descends to close the flow path and a reverse valve cylinder 301 with a built-in cylinder spring 305;
A disk 303 installed inside the reverse valve 302 and opened by pumping pressure when the pump 170 is in operation and closed when stopped or when compressed air is introduced,
It is installed on the upper part of the disk 303 inside the counter valve 302 and lowers the disk 303 downward by the expansion force of the spring to close the opening, so that the pumped groundwater and the inflow compressed air flow toward the water inlet 306. Disc spring (304) to prevent leakage,
On the upper side of the check cylinder 301, there is a water-air nozzle 310 having a circular or square shape, and the check valve 302 is operated by returning water or incoming groundwater or compressed air by switching the three-way electric valve 230. ) is lowered to discharge groundwater or compressed air into the pump housing 160 through the open water-air nozzle 310,
It is installed from the lower part of the pump housing 160 to the lowest part of the geothermal hole 100, and serves as an intake pipe for groundwater when the pumping pump 170 is in operation. A water-air combined inlet/outlet water pipe (130) made of high-density polyethylene that also serves as an outlet pipe for groundwater that is returned by switching to an electric valve (230) and an inflow pipe for compressed air for cleaning and removing foreign substances.
In order to prevent buoyancy caused by the difference in specific gravity between the high-density polyethylene pipe used as the water-air combined input/output water pipe 130 and groundwater, it is installed at the lower part of the water-air combined input/output water pipe 130 and is a porous water-air combined water pipe. A flotation prevention pipe (110) made of stainless steel having an inlet/outlet port (120),
A hub 150 attached to the lower part of the pump housing 160 and having a coupling structure that can be coupled with the water-air combined inlet/outlet pipe 130 with one touch,
A sleeve 140 attached to the upper part of the water-air combined inlet/outlet pipe 130 and having a coupling structure that can be coupled with the hub 150 with one touch,
A guide 165 that is attached to the lower part of the hub 150 and guides the sleeve 140 into the hub 150 to facilitate insertion when the hub 150 and the sleeve 140 are coupled with one touch,
A clamp 166 having a device to prevent the sleeve 140 and the hub 150 from being separated after one-touch coupling,
The sleeve 140 connected to one upper side of the water-air combined inlet and outlet water pipe 130 and the flotation prevention pipe 110 connected to one lower side of the water-air combined inlet and outlet water pipe 130 are connected to the center of the geothermal hole 100. Center pole (400), a center maintaining device for positioning,
When the water pump 170 installed in the geothermal well 100 fails, the adjacent geothermal well 100 is shut down to prevent water overflow to the ground surface caused by water return from the adjacent geothermal well 100 and to reduce the load. An overflow pipe (320) that forms a groundwater circulation flow path in series to enable large-temperature difference heat exchange,
An overflow pipe water source (330) installed in the overflow pipe (320) to control the inflow of groundwater or compressed air into the adjacent geothermal hole (100) through opening and closing operations,
A spherical filler made of rock with a diameter of about Ø25mm filled in the space around the flotation prevention pipe 110 and the water-air combined input/output pipe 130 to prevent the collapse or collapse of the soft rock beneath the top casing 410. (270),
A protector 420 attached to the lower part of the top casing 410 to prevent the filler 270 from rising to the top and leaking out due to bubbles of compressed air for cleaning,
Characterized in that it has a drain pipe (260) for discharging floating substances that float when removing accumulated foreign matter between the fillers (270) to the outside of the geothermal hole (100).
Energy-saving geothermal system that secures the safety of open geothermal wells and uses two-way fluid movement In claim 1
The center pole 400 is,
A bracket 404 that is bent into a U-shape by bending and has a cutting hole of a certain diameter.
An arm 401 made of a cutting hole of a certain diameter with a certain thickness and inclined surface; and
A pin 402 that is inserted and fixed into a cutting hole for coupling the bracket 404 and the arm 401 to each other,
It consists of an expansion spring 403 to accurately adhere the arm 401 to the rock surface of the geothermal hole 100,
Three or more pieces are attached to the flotation prevention pipe 110 and the water-air combined inlet/outlet pipe 130 by welding,
The water-air combined inlet/outlet pipe (130) and the floating prevention pipe (110) are accurately fixed and installed at the center of the geothermal hole (100); Characterized by making
An energy-saving geothermal system that ensures the safety of open geothermal wells and uses two-way fluid movement. In claim 1
If the rock mass of the geothermal hole 100 at the location where the flotation prevention pipe 110 and the water-air combined inlet/outlet pipe 130 is installed is in a weak state,
In the space between the cavity wall of the geothermal hole 100, the flotation prevention pipe 110 to which the center pole 400 is attached, and the water-air combined input and output pipe 130, a spherical filler 270 made of rock material with a diameter of about Ψ25 mm is placed. Filling prevents rock collapse or collapse of the hollow wall in advance and minimizes the accumulation of foreign substances by smoothing the flow of water; Characterized by making
An energy-saving geothermal system that ensures the safety of open geothermal wells and uses two-way fluid movement. In claim 1
In order to prevent the filler 270 filled in the geothermal hole 100 from being lifted and lost to the outside by bubbles of returned groundwater or compressed air,
A protector 420 having a disk-shaped structure having pores with a smaller diameter than the filler 270 is installed on the upper side of the water-air combined inlet/outlet pipe 130,
If the rock condition of the geothermal hole 100 on the upper side of the water-air combined inlet/outlet pipe 130 is poor and installation of the top casing 410 is necessary, screws, etc. are installed at the lower pipe end of the top casing 410. Attach and install using
If the rock condition of the geothermal hole 100 on the upper side of the water-air combined inlet/outlet pipe 130 is good and installation of the top casing 410 is not necessary,
Attached to the end of the guide 165 attached to the lower part of the hub 150 by welding; Characterized by,
An energy-saving geothermal system that ensures the safety of open geothermal wells and uses two-way fluid movement. In claim 1
The pump housing 160 in which the pump 170 and the sliding reverse displacement assembly 300 are installed at a point 40 to 50 m below the geothermal hole 100, and
The connection of the water-air combined inlet/outlet pipe 130 to which the flotation prevention pipe 110 is connected is a one-touch coupling method of a hub and sleeve structure. In detail,
A hub 150 whose inner surface is precisely processed and attached to the lower pipe of the pump housing 160 installed at the top of the geothermal hole 100 and
The upper pipe end of the water-air combined inlet/outlet pipe 130 installed in the lower part of the geothermal hole 100 includes a sleeve 140 with a precisely processed outer surface attached thereto.
The hub 150 has a reducing shape attached to facilitate insertion of the sleeve 140 into the hub 150 when coupled with the sleeve 140 and to prevent foreign substances from depositing on the coupling portion. 's guide (165) and
In order to prevent leakage of groundwater or compressed air due to internal and external pressure changes when combining the hub 150 and the sleeve 140, the internal O-ring groove (163g) has a plurality of O-rings (163) and a double blade structure. retainer (161) and
The sleeve 140 includes a locking stopper 164 attached externally so that the hub 150 is inserted and seated to a certain depth in the sleeve 140.
After the hub 150 is seated on the sleeve 140, the hub 150 is locked to the locking stopper 164 to prevent it from being separated due to pressure difference or temperature change. It has a hole of a certain diameter in the L-shaped wing. clamp (166) and
A U-shaped bracket (167a) for attaching the clamp (166) to the outer surface of the hub (150)
A fastening pin (167b) for fastening the clamp (166) to the bracket (167a) and
A guide 165 having a cutting groove of a certain size for fixing or removing the lower wing of the clamp 166 from the locking stopper 164
In order to maintain the clamp 166 accurately fixed to the locking stopper 164 or remove it, a clamp ring 168 in the shape of a circular ring is inserted outside the clamp 166 and moves up and down.
A clamp ring cable (168a) extended to the ground to move the clamp ring (168) up and down, and
By a ring stopper 169 that prevents the clamp ring 168, which is connected to the clamp ring cable 168a and moves up and down, from being separated from the lower part of the clamp 166,
When the clamp ring cable (168a) is tensioned and the clamp ring (168) moves upward, the upper wing contracts inward by the fastening pin (167b) and the lower wing expands outward, and when the lock is released, the sleeve ( 140) and the hub 150 have a separable structure,
When the clamp ring cable 168a is expanded and the clamp ring 168 moves downward, the lower wing is contracted inward, making it impossible for the sleeve 140 and the hub 150 to be separated; Characterized by having,
An energy-saving geothermal system that ensures the safety of open geothermal wells and uses two-way fluid movement. In claim 1
As a safety measure to prepare for the collapse or collapse of the geothermal hole 100 occurring in the unstable soft rock layer on the upper side of the water-air combined inlet/outlet pipe 130,
A perforated pipe having a groundwater inlet and outlet passage in a pipe made of PVC of a diameter capable of inserting and installing the pump housing 160, which includes the water pump 170 and the sliding reverse load assembly 300 , inside the external casing 105. This is provided,
A geothermal hole (100) with a stable structure is installed by installing a top casing (410) of an integrated structure with a protector (420) attached to prevent injury to the filler (270) filled around the water-air combined inlet/outlet pipe (130). implement; Characterized by,
An energy-saving geothermal system that ensures the safety of open geothermal wells and uses two-way fluid movement. In claim 1
The reverse displacement cylinder 301 of the sliding reverse displacement assembly 300 has a cylindrical structure that can be disassembled and assembled by tightening bolts, and the upper cover has a water-air inlet and outlet (309) through which pumped or returned groundwater or compressed air enters and exits. )and ,
At the lower part of the reverse cylinder 301, corresponding to the water-air inlet and outlet 309, there is an inlet 306 connected to the water pump 170 to receive pumped groundwater,
A water-air nozzle 310 having a circular or square shape is provided on the upper side of the reverse cylinder 301,
A reverse valve (302) that is inserted into the reverse valve cylinder (301) and slides up and down due to positive water and return pressure and pressure differences due to supply and blockage of compressed air from the compressed air storage tank (240),
A disk 303 installed at the inner lower part of the reverse valve 302 and opened by pumping pressure when the pump 170 is in operation and closed when stopped or when compressed air is introduced from the compressed air storage tank 240,
A disc spring 304 installed on the top of the disc 303 to always close the disc 303 by the expansion force of the spring,
It is installed between the lower side of the reverse valve cylinder 301 and the reverse valve 302, and the expansion force of the spring always pushes the reverse valve 302 toward the upper cover to close the water-air nozzle 310. It consists of a cylinder spring (305) that can supply and block groundwater and compressed air depending on operating conditions; Characterized by allowing,
An energy-saving geothermal system that ensures the safety of open geothermal wells and uses two-way fluid movement. In claim 1
In a state in which the pump 170 is stopped and the pumping water water valve 195 and the return water water valve 196 are blocked, compressed air from the compressed air storage tank 240 is supplied through the air control valve 250. When water flows into the sliding reverse discharge assembly 300 through the positive and water return pipe 190, which performs pumping and water return through a single pipe,
The disc 303 built into the reverse actuator 302 compresses the cylinder spring 305 in a closed state by the expansion force of the disk spring 304, thereby connecting the reverse actuator 302 to the reverse actuator cylinder 301. ) It moves downward and opens the water-air nozzle 310 and simultaneously introduces compressed air into the pump housing 160.
The compressed air introduced into the pump housing 160 is connected to the water-air combined input and output pipe 130 and the hub and sleeve coupling devices 150 and 140 ; and
When the foreign matter expands and ejects into the space of the filler 270 through the flotation prevention pipe 110 having the water-air combined inlet /outlet pipe 130 and the water-air combined inlet/outlet port 120, foreign matter between the filler 270 floats to the top along with air bubbles and is discharged to the outside through the drain pipe 260.
At this time, in order to prevent floating foreign matter from flowing into the adjacent geothermal hole 100 that is operating or at rest through the overflow pipe 320, the overflow pipe waterside 330 is temporarily closed and implemented; Characterized by,
An energy-saving geothermal system that ensures the safety of open geothermal wells and uses two-way fluid movement. In claim 1
The overflow pipes 320 are interconnected and installed between the plurality of geothermal holes 100,
When part of the heat pump 520 is stopped by the indoor temperature controller 500a of the indoor unit 500,
The temperature of the circulating fluid between the heat pump 520 and the ground source heat exchanger 210 decreases during cooling and increases during heating,
When the heat source temperature sensor 540 transmits the measured value to the automatic control system 550, the operation of the water pump 170 inside the geothermal hole 100 is stopped according to the input program.
The pumping station area (200) installed in the pumping and water return pipe (190) is automatically closed by the pumping pressure of another geothermal hole (100),
The water return opening of the three-way electric valve 230 is switched in the direction of the positive and water return pipe 190 and stopped.
The groundwater that was returned to the surface of the geothermal hole 100 stops flowing and flows through the positive and return pipe 190 and the pump housing outlet 180 to the reverse cylinder of the sliding reverse relief assembly 300. 301) It flows into the upper part.
Due to the return pressure of groundwater flowing into the upper part of the reverse relief cylinder 301, the self-weight of the disk 303, and the expansion force of the disk spring 304, the disk 303 is completely closed and at the same time the reverse relief cylinder 302 is released. When lowering and opening the water-air nozzle 310,
Ground water flowing into the upper part of the reverse displacement cylinder (301) is inside the pump housing (160), the hub (150) and sleeve (140), the water-air combined inlet and outlet pipe (130), and the flotation prevention pipe (110). And it flows out into the resting geothermal hole (100) through the water-air combined inlet/outlet port (120).
Thereafter, the groundwater flowing into the filler 270 space rises in the direction of the upper protection hole 340 installed on the ground surface, and the water level rises through a primary heat exchange process with the rock layer and aquifer flowing groundwater,
After descending to the water surface of the adjacent geothermal hole 100 in operation via the overflow pipe 320, and then going through a secondary heat exchange process with the rock layer and flowing groundwater,
Via the water-air combined inlet and outlet port 120 of the flotation prevention pipe 110, the flotation prevention pipe 110, the water-air combined inlet and outlet pipe 130, and the sleeve 140 and hub 150. When it flows into the pump housing 160,
A downward circulation cycle and an upward circulation cycle that perform a circulation process in which water is pumped by the pump 170 and discharged to the positive and return pipe 190, the positive water reservoir 195, and the positive water reservoir 200. Great temperature difference (dt) heat exchange that implements a complex circulation system of; Characterized by,
An energy-saving geothermal system that ensures the safety of open geothermal wells and uses two-way fluid movement.