Underground heat exchange device of wall-building-while-drilling type ground source heat pump

Abstract

The invention provides a buried heat exchange device of a wall-building-while-drilling type ground source heat pump, and belongs to the technical field of ground source heat pump devices, the buried heat exchange device comprises a well hole, an outer pipe assembly, an inner pipe, angular gravel materials, a heat exchanger, a circulating pump component and a water inlet sand filtering component, the well hole is vertically formed, and a solidified wall-building-while-drilling material is solidified along with the formation of the well hole; an isolation sealing flange is arranged between the outer pipe assembly and the inner pipe and is matched with filled angular gravel materials to divide the device into a three-water-chamber equivalent circulating heat exchange system formed by an upper water chamber, an outer water chamber and a lower water chamber, backflow circulating water output by a heat pump overflows to the outer water chamber from the upper water chamber and circulates in the outer water chamber from top to bottom, and the heat exchange efficiency is improved. The outer wall of the system outer water chamber exchanges heat with underground rock, soil and water, heat energy is collected and stored to the ground, circulating water after heat energy collection or storage flows back to the lower water chamber from the outer water chamber to conduct cold exchange and heat exchange on the heat exchanger, and then the circulating water is pressurized by the circulating pump component and pumped out of the circulating system through the inner heat exchanger pipe, so that the heat pump unit supplies heat or refrigerates, and high efficiency and energy conservation are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ground source heat pump devices, and in particular to an underground heat exchange device of a drilling-while-drilling ground source heat pump. Background Art

[0002] The ground source heat pump system is a device that uses shallow underground geothermal resources to provide both heating and cooling. The ground source heat pump can transfer energy from low-temperature heat sources to high-temperature heat sources by inputting a small amount of electrical energy. In winter, the heat in the geology can be replaced and supplied to the room for heating; in summer, the indoor heat can be replaced into the geology to cool the room.

[0003] After the existing ground source heat pump is drilled on site, in order to isolate the rock, soil, water and heat exchange pipelines in the wellbore, it is necessary to bury metal pipes close to the well wall. This is not only difficult to construct but also costly. In addition, groundwater is often used directly as a heat source. If the reinjection is not handled properly, it is easy to cause groundwater pollution, affecting the ecological environment and human health. In addition, insufficient or uneven reinjection may also lead to geological problems such as ground subsidence. Summary of the invention

[0004] The purpose of the present invention is to provide an underground heat exchange device of a drilling-based wall-building type ground source heat pump, which adopts a solution of real-time solidification of the drilling-based wall-building material as the wellbore is opened, and can directly form a solidified solid hole wall membrane that is basically isolated from the rock, soil and water outside the hole while drilling, and can form a three-water chamber system consisting of an upper water chamber, an outer water chamber and a lower water chamber through an outer pipe assembly, an inner pipe, an isolation sealing flange and angular gravel filled in the outer pipe assembly, which can collect and store heat from the earth in an efficient and energy-saving manner, and can take heat without taking water, thereby effectively protecting the geological ecological environment.

[0005] The object of the present invention is achieved through such a technical solution, a buried heat exchange device of a drilling-based wall-building type ground-source heat pump, comprising a wellbore, a drilling-based solidified wall-building material, an outer pipe assembly, an inner pipe, an isolation sealing flange, a circulating pump component, a heat pump unit, a water inlet sand filter component, a spiral guide groove and an internal heat exchanger component, the outer pipe assembly comprises a split bridge-type water filter flower pipe component, the split bridge-type water filter flower pipe component comprises a water filter main pipe and a split connecting pipe, and the water inlet sand filter component comprises a filter cartridge and filter holes; The wellbore is opened vertically, and the drilling-curing wall-forming material is cured on the inner wall of the wellbore as the wellbore is opened. The outer pipe assembly is lowered into the drilling-curing wall-forming material as a whole. The upper and lower ends of the split bridge-type water filter flower pipe component are connected with spiral solid wall pipes, and the side wall of a group of spiral solid wall pipes at the bottom is connected with a side connecting pipe. The outer surfaces of the spiral solid wall pipe, the split bridge-type water filter flower pipe component and the side connecting pipe and the inner surface of the drilling-curing wall-forming material are filled with angular gravel materials. The inner pipe extends into the spiral solid wall pipe and the split bridge-type water filter flower pipe component to form a pipe fitting The circulation pump component is installed at the bottom of the inner tube, the water inlet sand filter component is installed at the inner bottom of a group of spiral solid wall tubes at the bottom end, the heat pump unit is connected with the top of the side wall of a group of spiral solid wall tubes at the top end and the top of the inner tube, the built-in heat exchanger component is installed at the inner lower part of the group of spiral solid wall tubes at the bottom end, and the connecting pipeline of the built-in heat exchanger component passes through the inside of the side connecting pipe and is connected with the heat dissipation part of the heat pump unit, and the isolation sealing flange is fixedly installed between the inner surface of the group of spiral solid wall tubes at the bottom end and the outer surface of the inner tube; The spiral guide groove is connected between the outside of the inner tube and the inner surface of the water filter main pipe, and the split pipes are connected to the outside of the water filter main pipe in a spiral arrangement according to the spiral path of the spiral guide groove. A water hole is provided on the bottom side of each group of split pipes. The outside of the filter cartridge is fixedly connected to the inner surface of the spiral solid wall tube, the filter hole is opened in the top body of the filter cartridge, a hydraulic impeller is screwed in the inner cavity of the filter cartridge, a wire brush is fixed on the top of the hydraulic impeller blade, and the wire brush is in friction contact with the filter hole.

[0006] The use process of the technical solution provided by the present invention is as follows: The wall-building material solidified while drilling is solidified on the inner wall of the wellbore as the wellbore is opened. It refers to the process of directly building the wall with artificial solid materials during the wellbore drilling process, which can improve the strength and thickness of the wellbore wall membrane and form a solidified solid wall membrane; The angular gravel filled between the outer surface of the spiral solid wall pipe and the split bridge filter flower pipe components and the inner surface of the drilling solidification wall material is filled with homogeneous angular gravel with good purity, which can increase the void ratio after filling the gravel, ensure the smooth flow of circulating water in it, and fully contact with the underground rock, soil and water body, and efficient heat exchange; The outer tube assembly, the inner tube, the angular gravel material and the isolation sealing flange can form three water chambers, that is, the cavity between the outer part of the inner tube above the isolation sealing flange and the inner surface of the outer tube assembly is the upper water chamber, the pores formed by the angular gravel material filled with the outer surface of the outer tube assembly and the inner surface of the drilling solidification wall material are the outer water chamber, and the cavity between the outer part of the inner tube below the isolation sealing flange and the inner surface of the outer tube assembly is the lower water chamber; The return circulating water output by the heat pump unit first enters the upper water chamber, and can flow out from each group of water holes slowly and evenly through the guidance of the spiral guide groove, enter the outer water chamber, and circulate from top to bottom in the outer water chamber. Through the heat exchange with underground rock, soil and water bodies through the wall material solidified while drilling, heat energy is collected and stored from the earth. After collecting or storing heat energy, the circulating water is filtered by the water inlet sand filter component and then enters the lower water chamber. The filter holes can form a filtering and intercepting effect to filter out gravel particles. In this process, the hydraulic impeller can be driven to rotate. The wire brush fixed on the top of the hydraulic impeller blade can scrape the filter holes to prevent gravel particles from clogging the filter holes, so that the filter holes are always in a smooth state. The circulating pump components in the lower water chamber pressurize the circulating water and output it to the outside through the inner pipe for use by the heat pump for heating or cooling.

[0007] By adopting the above technical solution, the present invention can achieve the following beneficial effects: (1) The present invention adopts a large-hole ground source heat exchange method. In the same ground source hole, three water chambers can be closed and equal-circulation heat exchange can be achieved. Since it is isolated from the rock, soil and water outside the hole, heat can be taken without taking water, which is energy-saving and environmentally friendly. (2) The present invention can efficiently advance, convert and enhance the heat of underground rock and soil, and provide heating and cooling to end users through heat pumps. Since the temperature of the underground rock and soil is basically constant relative to the external environment, it can stably and continuously conduct, store and provide heat exchange. It consumes 1KW of electricity and can produce 4.5 to 5KW of thermal energy. It is safe and reliable, has a long service life, and is highly efficient and energy-saving. In addition, the single-hole heat exchange efficiency is high, and there are no problems such as the large number of ordinary small-hole ground source holes, large footprint, high failure rate, and severe attenuation. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0009] Figure 1 It is an overall schematic diagram of an underground heat exchange device of a drilling-while-drilling ground-source heat pump according to the present invention; Figure 2 A schematic diagram of an external facility connected to a main engine water inlet pipe and a main engine water outlet pipe of the present invention; Figure 3 It is a structural schematic diagram of the split bridge type water filter flower pipe component of the present invention; Figure 4 It is a schematic diagram of the installation structure of the spiral guide groove of the present invention; Figure 5 It is a structural schematic diagram of the water inlet sand filter component of the present invention; Figure 6 It is a schematic diagram of the explosion structure of the water inlet sand filter component of the present invention; Figure 7 It is a schematic structural diagram of the openable check valve of the present invention.

[0010] Figure numerals: 1, wellbore; 2, wall material solidified while drilling; 3, outer pipe assembly; 4, inner pipe; 5, angular gravel material; 6, backfill clay; 7, isolation sealing flange; 8, circulation pump component; 9, water inlet sand filter component; 10, drain valve; 11, drain pipe; 12, main engine water inlet valve; 13, main engine water inlet pipe; 14, main engine water outlet pipe; 15, main engine water outlet valve; 16, heat pump unit; 17, user end; 18, filter; 19, Water softener; 20. External water tank; 21. Booster pump; 22. Forward flushing pipe; 23. Forward flushing valve; 24. Backwashing pipe; 25. Backwashing valve; 26. Backwashing drain pipe; 27. Backwashing drain valve; 28. Water tank inlet pipe; 29. ​​Automatic water supply valve; 30. Water supply pipe; 31. Buffer tank; 32. Flow meter; 33. Automatic water supply valve; 34. Spiral guide groove; 35. Internal heat exchanger component; 36. Radiator water pump; 301, spiral solid wall pipe; 302, split bridge type water filter flower pipe component; 303, top cover; 304, side connecting pipe; 305, side pipe cover; 801, submersible pump; 802, openable check valve; 901, filter cartridge; 902, filter hole; 903, hydraulic impeller; 904, cone head seat; 905, wire brush; 906, internal rotation seat 3501, heat exchanger; 3502, water inlet pipe of heat exchanger; 3503, water outlet pipe of heat exchanger; 3504, side sealing flange; 30201, water filter main pipe; 30202, split pipe; 30203, water hole; 30204, main pipe side hole; 80101, valve body; 80102, valve cover; 80103, sliding seat; 80104, outer cover; 80105, electric cylinder; 80106, piston rod; 80107, compression spring; 80108, water inlet chamber; 80109, water blocking chamber; 80100, internal resistance seat. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0013] Please refer to the attached Figure 1-7 An example is given to describe an underground heat exchange device of a drilling-while-drilling ground-source heat pump provided by the present invention.

[0014] Embodiment 1:

[0015] The on-site construction and heat exchange principle of the present invention refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The wellbore 1 is opened vertically, and the drilling-cured wall-forming material 2 can be quickly cured on the inner wall of the wellbore 1 as the wellbore 1 is opened. The outer pipe assembly 3 is lowered into the drilling-cured wall-forming material 2 as a whole. The upper and lower ends of the split bridge-type water-filtering flower pipe component 302 are connected with spiral solid wall pipes 301, and the side walls of a group of spiral solid wall pipes 301 at the bottom are connected with side connecting pipes 304. The outer surfaces of the spiral solid wall pipes 301, the split bridge-type water-filtering flower pipe components 302 and the side connecting pipes 304 and the inner surface of the drilling-cured wall-forming material 2 after curing are filled with angular gravel materials 5. The inner pipe 4 extends into the interior of the pipe fitting composed of the spiral solid wall pipe 301 and the split bridge-type water-filtering flower pipe components 302, and the circulating pump component 8 is arranged Installed at the bottom of the inner tube 4, the water inlet sand filter component 9 is installed at the inner bottom of a group of spiral solid wall tubes 301 at the bottom end, the heat pump unit 16 is connected with the side wall of a group of spiral solid wall tubes 301 at the top end and the top of the inner tube 4, the built-in heat exchanger component 35 is installed at the inner lower part of the group of spiral solid wall tubes 301 at the bottom end, and the connecting pipeline of the built-in heat exchanger component 35 passes through the inside of the side connecting pipe 304 and is connected with the heat dissipation part of the heat pump unit 16, the isolation sealing flange 7 is fixedly installed between the inner surface of the group of spiral solid wall tubes 301 at the bottom end and the outer surface of the inner tube 4, and the circulation pump component 8 is located below the isolation sealing flange 7, and the built-in heat exchanger component 35 is located below the circulation pump component 8; Backfill clay 6 is also filled between the outer surface of a group of spiral solid wall pipes 301 and the side connecting pipe 304 at the top and the inner surface of the cured wall-building material 2, and the backfill clay 6 needs to be backfilled to a depth of 20m from the horizontal ground to form a sealing layer to ensure that the circulating water does not leak out; The top cover 303 is fixedly connected to the top opening of a group of spiral solid wall tubes 301 at the top, the top outer surface of the inner tube 4 is sealed with the top cover 303, and the side tube cover 305 is fixedly connected to the top opening of the side connecting tube 304; The heat exchanger 3501 is installed in the lower inner part of a group of spiral solid wall tubes 301 at the bottom, and is connected to the heat dissipation pipes of the heat pump unit 16 through the heat exchanger water inlet pipe 3502 and the heat exchanger water outlet pipe 3503. The side sealing flange 3504 is fixedly installed at the interface between the side connecting pipe 304 and the side wall of the spiral solid wall tube 301 at the bottom. The outsides of the heat exchanger water inlet pipe 3502 and the heat exchanger water outlet pipe 3503 are fixedly connected to the side sealing flange 3504, and are connected to the heat dissipation pipes of the heat pump unit 16 after passing through the main body of the side pipe cover 305. A heat dissipation water pump 36 is also installed in the main pipe of the heat exchanger water inlet pipe 3502; The main water filter pipe 30201 is the main body of the spiral solid wall pipe 301, the spiral guide groove 34 is connected between the outside of the inner pipe 4 and the inner surface of the main water filter pipe 30201, the split pipes 30202 are connected to the outside of the main water filter pipe 30201 in a spiral arrangement according to the spiral path of the spiral guide groove 34, and are communicated with the inside of the main water filter pipe 30201, and the bottom side of each group of split pipes 30202 is provided with a water hole 30203, and the split pipes 30202 are buried in the angular gravel 5; The main pipe side holes 30204 are opened in the pipe wall of the water filter main pipe 30201 based on the spiral path of the spiral guide groove 34. The split pipe 30202 is connected to the main pipe side holes 30204, so that after the spiral guide groove 34 is arranged between the outer surface of the inner pipe 4 and the inner surface of the water filter main pipe 30201, no obstruction or interference is formed on any group of main pipe side holes 30204, and the passage of water flow is not affected. Furthermore, the existence of the side connecting pipe 304 will not affect the arrangement and fixation of the split connecting pipe 30202 outside the water filtering main pipe 30201; The outer surface of the filter cartridge 901 is fixedly connected to the inner surface of the spiral solid wall tube 301, and the filter hole 902 is provided in the top body of the filter cartridge 901. A hydraulic impeller 903 is freely rotatably connected in the inner cavity of the filter cartridge 901. A wire brush 905 is fixed to the top of the blade of the hydraulic impeller 903, and the wire brush 905 is in frictional contact with the filter hole 902. The wall-building material 2 solidified while drilling is solidified on the inner wall of the wellbore 1 as the wellbore 1 is opened. It refers to the process of directly building the wall with artificial solidified materials during the drilling of the wellbore 1, which can improve the strength and thickness of the wall membrane of the wellbore 1, form a solidified solid wall membrane, and basically isolate the rock, soil and water inside the hole from the outside of the hole. The heat energy of the earth's rock, soil and water can be collected by conduction, which can replace metal pipes and reduce the cost of heat energy collection and storage; In order to make the wall-forming material 2 formed by drilling 2 form a solid wall membrane on the inner wall of the wellbore 1 that is basically isolated from the rock, soil and water outside the hole, after drilling is completed, it is also necessary to lay the solid wall-forming material 2 by drilling 2 at the bottom of the wellbore 1; The angular gravel material 5 filled between the outer surface of the spiral solid wall pipe 301, the split bridge-type water filter flower pipe component 302 and the side connecting pipe 304 and the inner surface of the cured drilling wall material 2 is a homogeneous angular gravel material 5 with good purity, which can increase the porosity after filling the gravel, ensure the smooth flow of circulating water therein, and fully contact with the underground rock, soil and water body, and efficient heat exchange; The outer tube assembly 3, the inner tube 4, the angular gravel material 5 and the isolation sealing flange 7 can form three water chambers, that is, the cavity between the outer part of the inner tube 4 above the isolation sealing flange 7 and the inner surface of the outer tube assembly 3 is the upper water chamber, the pores formed by the outer surface of the outer tube assembly 3 and the angular gravel material 5 filled with the inner surface of the drilling solidification wall-building material 2 are the outer water chamber, and the cavity between the outer part of the inner tube 4 below the isolation sealing flange 7 and the inner surface of the outer tube assembly 3 is the lower water chamber; The return circulating water output by the heat pump unit 16 first enters the upper water chamber, and can slowly and evenly flow out from each group of water holes 30203 through the guidance of the spiral guide groove 34, enter the outer water chamber, and circulate from top to bottom in the outer water chamber, and exchange heat with underground rocks, soil, and water bodies through the wall-building material 2 solidified while drilling, and collect and store heat energy from the earth. The circulating water after collecting or storing heat energy is filtered by the water inlet sand filter component 9 and then enters the lower water chamber. The filter hole 902 can form a filtering and intercepting effect to filter out gravel particles, and in this process, it can drive the rotation of the hydraulic impeller 903. The wire brush 905 fixed on the top of the blade of the hydraulic impeller 903 can form a scraping action on the filter hole 902 to prevent the gravel particles from clogging the filter hole 902, so that the filter hole 902 is always in a smooth state; The cone head seat 904 is fixed at the bottom opening of the filter cartridge 901 and is in the shape of a cone head, which is used to protect the hydraulic impeller 903. Another purpose of setting the cone head seat 904 in the shape of a cone head is that when the outer tube assembly 3 is lowered into the well, it can be easily inserted into the angular gravel 5 pre-laid at the bottom of the wellbore 1; An inner rotating seat 906 is fixedly installed in the middle of the inner cavity top of the filter cartridge 901, and the rotating shaft of the hydraulic impeller 903 is rotatably connected to the inner rotating seat 906, so that the hydraulic impeller 903 can be in a state of free rotation; The circulating pump component 8 in the lower water chamber pressurizes the circulating water and outputs it to the outside through the inner pipe 4 for use by the heat pump unit 16 for heating or cooling; The heat pump unit 16 will generate working heat when it is working. It is necessary to install heat dissipation pipes in the heat pump unit 16 and connect it with the water path of the heat exchanger 3501 installed in the lower part of a group of spiral solid wall tubes 301 at the bottom. The heat dissipation water pump 36 drives the water source to flow between the heat dissipation pipes of the heat pump unit 16, the heat exchanger inlet pipe 3502, the heat exchanger 3501 and the heat exchanger outlet pipe 3503. It can not only achieve the purpose of heat dissipation of the heat pump unit 16, but also use the heat exchanger 3501 as a medium to store thermal energy, thereby improving the energy saving effect.

[0016] Embodiment 2:

[0017] Based on the first embodiment, the specific use of the circulating pump component 8 in the device is as follows: Figure 1 and Figure 7 As shown, the submersible pump 801 is connected to the bottom inlet of the inner tube 4, and the check valve 802 can be opened to connect to the inlet of the submersible pump 801; The valve cover 80102 is sealedly connected to an opening on one side of the valve body 80101, a sliding seat 80103 is fixed to the middle of the inner end of the valve cover 80102, the top outlet of the valve body 80101 is connected to the bottom inlet of the inner tube 4, the bottom inlet of the valve body 80101 is connected to the outlet of the openable check valve 802, the outer cover 80104 is covered on the outside of the valve cover 80102, the main body of the electric cylinder 80105 is fixedly connected to the inner cavity surface of the outer cover 80104, and the telescopic rod of the electric cylinder 80105 is sealed through the sliding seat 80103 and then fixedly connected to the piston column 80106; The inner cavity of the valve body 80101 is composed of a water inlet cavity 80108 and a water blocking cavity 80109, and the water inlet cavity 80108 is connected to the openable check valve 802, and the water blocking cavity 80109 is connected to the inner tube 4; The piston rod 80106 is elastically squeezed at the interface between the water inlet chamber 80108 and the water blocking chamber 80109. An internal resistance seat 80100 is also fixed in the inner cavity of the valve body 80101 at a position directly opposite to the interface between the water inlet chamber 80108 and the water blocking chamber 80109. A compression spring 80107 is sleeved and installed on the outside of the telescopic rod of the electric cylinder 80105. One end of the compression spring 80107 is fixed to the piston column 80106, and the other end is fixed to the sliding seat 80103. When the electric cylinder 80105 is in an unpowered state and there is no water flow in the valve body 80101 under the action of the elastic supporting force of the compression spring 80107, the piston column 80106 is in a state of cutting off the water inlet chamber 80108 and the water blocking chamber 80109; after the openable check valve 802 is started, the water pressure formed by the openable check valve 802 is greater than the supporting elastic force of the compression spring 80107, and the piston column 80106 can be pushed open to allow the water source to pass normally; and due to the supporting elastic force formed by the compression spring 80107, after the water source enters the inner cavity of the valve body 80101 from the water blocking chamber 80109, the piston column 80106 will be squeezed to form a sealing effect between the water blocking chamber 80109 and the water inlet chamber 80108, thereby achieving a non-return effect and preventing the water source in the inner tube 4 from flowing back due to gravity.

[0018] Embodiment three:

[0019] Based on the first and second embodiments, the use of the device and the example of forward and reverse flushing operation are as follows: Figure 1 , Figure 2 and Figure 3 As shown, the two sides of the top outlet of the inner tube 4 are respectively connected with a drain pipe 11 and a main unit water inlet pipe 13, a drain valve 10 is installed in the main line of the drain pipe 11, a main unit water inlet valve 12 is installed in the main line of the main unit water inlet pipe 13, a main unit water outlet pipe 14 is connected to the side wall of a group of spiral solid wall pipes 301 at the upper end, a main unit water outlet pipe 14 is installed in the main line of the main unit water outlet pipe 14, the other ends of the main unit water inlet pipe 13 and the main unit water outlet pipe 14 are commonly connected to a heat pump unit 16, and one end of the heat pump unit 16 is connected to a user end 17; Specifically, the borehole 1 is set to have a diameter of 800 mm and a depth of 150 m. The specifications of the spiral solid wall pipe 301 are D325×5.5 mm, the specifications of the water filter main pipe 30201 are D325×5.5 mm, and the specifications of the split pipe 30202 are D60×5.0 mm. The inner pipe 4 is a PE grade insulation pipe De90 with a pressure bearing capacity of 1.6 MPa. The specification of the side connecting pipe 304 is D150×5.0 mm; the specifications of the heat exchanger water inlet pipe 3502 and the heat exchanger water outlet pipe 3503 are the same, both are PE grade insulation pipe De50, with a pressure bearing capacity of 1.6MPa; The spiral solid wall pipe 301 is used at the position where the clay 6 is filled in the wellbore 1, that is, the spiral solid wall pipe 301 is used above the sealing layer, and the split bridge type water filter flower pipe component 302 is used at the position 6 to 30 meters above the bottom of the wellbore 1 from 48 meters below the bottom of the sealing layer, and the remaining positions are spiral solid wall pipes 301; In the working state of circulating water heat exchange, there is sufficient circulating water in the device system, and the circulating pump component 8 can be started by the controller in the control room to generate water flow power; After closing the drain valve 10 and opening the main engine water inlet valve 12 and the main engine water outlet valve 15, the return circulating water output by the heat pump unit 16 can enter the upper water chamber formed between the outer part of the inner tube 4 above the isolation sealing flange 7 and the inner surface of the outer tube assembly 3 through the main engine water outlet pipe 14, and enter the outer water chamber formed by the outer surface of the outer tube assembly 3 and the angular gravel material 5 filled with the inner surface of the drilling solidification wall material 2 through the split bridge-type water filter flower pipe component 302, and enter the lower water chamber formed between the outer part of the inner tube 4 below the isolation sealing flange 7 and the inner surface of the outer tube assembly 3 through the interception and filtration of the water inlet sand filter component 9, and enter the lower water chamber formed between the inner surface of the outer tube assembly 3 and the inner surface of the outer tube assembly 3, and communicate with the circulation pump component 8 located in the lower water chamber, so that the water source after heat exchange returns to the heat pump unit 16 again through the inner tube 4 and the main engine water inlet pipe 13, completing the heat exchange process; A filter 18 and a water softener 19 are also installed in the main pipe of the main unit water inlet pipe 13. The filter 18 is used to intercept small particles in the water source again, and the water softener 19 is used to soften the water source to prevent scale from forming and protect the heat pump unit 16 and the user end 17. At the same time, the filter 18 can also provide a certain degree of protection for the water softener 19. An external water tank 20 is also provided on one side of the main engine water inlet pipe 13 and the main engine water outlet pipe 14. A booster pump 21 is connected to the water outlet end of the external water tank 20. A forward flushing pipe 22 and a backwashing pipe 24 are connected to the water outlet end of the booster pump 21. The forward flushing pipe 22 is connected to the main engine water outlet pipe 14, and the backwashing pipe 24 is connected to the main engine water inlet pipe 13. A forward flushing valve 23 is installed in the main pipe of the forward flushing pipe 22, and a backwashing valve 25 is installed in the main pipe of the backwashing pipe 24. The main engine water outlet pipe 14 is also connected to a backwash drain pipe 26, and a backwash drain valve 27 is installed in the main pipe of the backwash drain pipe 26; After the initial installation of the device is completed, a well washing operation is required to replace the mud in the device with clean water; when the positive flushing valve 23 and the drain valve 10 are opened and all other valves are closed, the booster pump 21 is started to extract the clean water source in the external water tank 20. The clean water flows from the main machine outlet pipe 14 into the upper water chamber formed between the outer part of the inner pipe 4 isolated by the isolation sealing flange 7 and the inner surface of the outer pipe assembly 3, and enters the outer side of the outer pipe assembly 3 and the drilling rig from the split bridge filter flower pipe component 302. The angular gravel material 5 filled with the inner surface of the solidified wall-making material 2 enters the outer water chamber formed by the lower water chamber formed between the outer part of the inner tube 4 and the inner surface of the outer tube assembly 3 isolated by the isolation sealing flange 7, and is connected with the circulation pump component 8 located in the lower water chamber, so that the mud water is discharged from the drainage pipe 11 to the outside until the discharged mud water is clear, completing the well washing operation after the initial installation of the device, thereby improving the circulation smoothness of the heat exchange system formed by the three water chambers, reducing the circulation resistance, reducing the construction cost, and avoiding the collapse of the hole wall; At the same time, after the device has been running for a certain period of time, it can also be periodically flushed according to the actual operating conditions, in order to reduce the particulate matter in the circulating water source and protect the heat pump unit 16 and the user end 17; The device can not only perform forward flushing in the flow direction of the water source of the heat pump unit 16, but also perform backwashing in the direction opposite to the flow direction of the water source of the heat pump unit 16, with the purpose of improving the efficiency of daily maintenance; when the backwash valve 25 and the backwash drain valve 27 are opened and all other valves are closed, the booster pump 21 and the electric cylinder 80105 are started. The purpose of starting the electric cylinder 80105 is that, in the case of backwashing, the flushing water source needs to flow from the water blocking chamber 80109 to the water inlet chamber 80108. At this time, the electric cylinder 80105 needs to be started to drive the piston column 80106 to be recovered, so that the other side of the piston column 80106 is in contact with the internal resistance seat 80100, allowing the inner cavity of the valve body 80101 to form a self-blocking water cavity 80109 is a passage to the water inlet chamber 80108; the booster pump 21 will extract the clean water source in the external water tank 20, and the clean water enters the inner tube 4 from the main engine water inlet pipe 13, and enters from the inner tube 4 into the lower water chamber formed between the outer part of the inner tube 4 below the isolation sealing flange 7 and the inner surface of the outer tube component 3, and enters into the outer water chamber formed by the outer side of the outer tube component 3 and the angular gravel material 5 filled with the inner surface of the drilling solidification wall material 2, and then enters into the upper water chamber formed between the outer part of the inner tube 4 above the isolation sealing flange 7 and the inner surface of the outer tube component 3 through the split bridge-type water filter flower pipe component 302. When the backwash drain valve 27 is opened, the backwash water is discharged from the clay 6 backfilled in the external water tank 20 to the outside; The water inlet end of the external water tank 20 is also connected to a water tank inlet pipe 28, an automatic water supply valve 29 is installed in the main pipeline of the water tank inlet pipe 28, and the water tank inlet pipe 28 is connected to the external normally open tap water, which can automatically supply and replenish water to the external water tank 20; A flow meter 32 and a buffer tank 31 are also installed in the main line of the main machine water outlet pipe 14, and a water supply pipe 30 is also connected to the water outlet end of the booster pump 21. The water supply pipe 30 is connected to the buffer tank 31, and an automatic water supply valve 33 is installed in the main line of the water supply pipe 30. The flow meter 32, the automatic water supply valve 33 and the booster pump 21 are all connected to the controller in the control room. The automatic water supply valve 33 and the booster pump 21 can be automatically controlled according to the flow signal change formed by the flow meter 32, and the buffer tank 31 can be replenished with water to maintain the water volume of the circulating water of the device. The water supply valve 33 also has a non-return function to prevent the water source in the buffer tank 31 from backflowing.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An underground heat exchange device of a drilling-while-drilling ground-source heat pump, comprising a wellbore (1) and a drilling-while-drilling solidifying wall material (2), characterized in that: It also includes an outer tube assembly (3), an inner tube (4), an isolation sealing flange (7), a circulation pump component (8), a water inlet sand filter component (9), a heat pump unit (16) and a built-in heat exchanger component (35), wherein the outer tube assembly (3) includes a split bridge-type water filter flower tube component (302); The wellbore (1) is vertically opened, and the drilling solidification wall material (2) is solidified on the inner wall of the wellbore (1) as the wellbore (1) is opened. The main body of the outer pipe assembly (3) is composed of a spiral solid wall pipe (301) connected to the upper and lower ends of a split bridge-type water filter flower pipe component (302), and the outer pipe assembly (3) is lowered into the inner cavity formed by the drilling solidification wall material (2). The inner pipe (4) extends into the interior of the pipe assembly composed of the spiral solid wall pipe (301) and the split bridge-type water filter flower pipe component (302). The circulation pump component (8) is installed at the bottom of the inner pipe (4), and the water inlet sand filter component (9) is installed at the inner bottom of the spiral solid wall pipe (301) at the bottom end. The heat pump unit (16) is connected to the side wall of the spiral solid wall pipe (301) at the top. The top of the inner tube (4) is connected, the side wall of the spiral solid wall tube (301) at the bottom end is connected to a side connecting tube (304), the outer surfaces of the spiral solid wall tube (301), the split bridge-type water filter flower tube component (302) and the side connecting tube (304) and the inner surface of the drilling-cured wall material (2) are filled with angular gravel (5), the built-in heat exchanger component (35) is installed in the lower inner part of the spiral solid wall tube (301) at the bottom end, and the connecting pipeline of the built-in heat exchanger component (35) passes through the side connecting tube (304) and is connected to the heat dissipation part of the heat pump unit (16), and the isolation sealing flange (7) is fixedly installed between the inner surface of the spiral solid wall tube (301) at the bottom end and the outer surface of the inner tube (4).

2. The underground heat exchange device of the drilling-while-drilling ground-source heat pump according to claim 1 is characterized in that: The split bridge-type water filter flower pipe component (302) comprises a water filter main pipe (30201) and a split pipe connection (30202); the water inlet sand filter component (9) comprises a filter cartridge (901) and filter holes (902); a spiral guide groove (34) is connected between the outer surface of the inner pipe (4) and the inner surface of the water filter main pipe (30201); the split pipe connection (30202) is connected to the outer surface of the water filter main pipe (30201) in an arrangement manner along the spiral path of the spiral guide groove (34); A water hole (30203) is provided on the bottom side of each group of split pipes (30202); the outside of the filter cartridge (901) is fixedly connected to the inner surface of the spiral solid wall tube (301); the filter hole (902) is provided in the top body of the filter cartridge (901); a hydraulic impeller (903) is screwed into the inner cavity of the filter cartridge (901); a wire brush (905) is fixed to the top of the blade of the hydraulic impeller (903); and the wire brush (905) is in frictional contact with the filter hole (902).

3. The underground heat exchange device of the drilling-while-drilling ground-source heat pump according to claim 2 is characterized in that: Backfill clay (6) is also filled between the outer surfaces of the spiral solid wall pipe (301) and the side connecting pipe (304) at the top and the inner surface of the cured while drilling wall material (2).

4. The underground heat exchange device of the drilling-while-drilling ground-source heat pump according to claim 3 is characterized in that: The outer tube assembly (3) further comprises a top cover (303) and a side tube cover (305); the internal heat exchanger component (35) comprises a heat exchanger (3501), a heat exchanger water inlet pipe (3502), a heat exchanger water outlet pipe (3503), and a side sealing flange (3504); the top cover (303) is fixedly connected to the top opening of the spiral solid wall tube (301) at the top end; the side tube cover (305) is fixedly connected to the top opening of the side connecting pipe (304); the top outer surface of the inner tube (4) is sealedly connected to the top cover (303); the heat exchanger (3501) is installed at the inner lower part of the spiral solid wall tube (301) at the bottom end, and is connected to the inner lower part of the spiral solid wall tube (301) through the heat exchanger water inlet pipe (3502) and the heat exchanger water outlet pipe (3503). The pipe (3503) is connected to the heat dissipation pipe fitting of the heat pump unit (16); the side sealing flange (3504) is fixedly installed at the interface between the side connecting pipe (304) and the side wall of the spiral solid wall pipe (301) at the bottom; the outsides of the heat exchanger water inlet pipe (3502) and the heat exchanger water outlet pipe (3503) are fixedly connected to the side sealing flange (3504); the split bridge-type water filter flower pipe component (302) further includes a main pipe side hole (30204); the main pipe side hole (30204) is opened in the pipe wall of the water filter main pipe (30201) based on the spiral path of the spiral guide groove (34); and a heat dissipation water pump (36) is also installed in the main pipe of the heat exchanger water inlet pipe (3502).

5. The underground heat exchange device of a drilling-while-drilling ground-source heat pump according to claim 1, 2, 3 or 4, characterized in that: The circulation pump component (8) comprises a submersible pump (801) and an openable check valve (802). The submersible pump (801) is connected to the bottom inlet of the inner tube (4), and the openable check valve (802) is connected to the inlet of the submersible pump (801). The submersible pump (801) comprises a valve body (80101), an outer cover (80104), an electric cylinder (80105), a piston rod (80106), a water inlet chamber (80108), and a water blocking chamber (80109). A valve cover (80102) is sealed at an opening on one side of the valve body (80101). A sliding seat (80103) is fixed to the middle of the inner end of the valve cover (80102). The outer cover (80104) is covered on the outside of the valve cover (80102). The electric cylinder (80105) The main body is fixedly connected to the inner cavity surface of the outer cover (80104); the telescopic rod of the electric cylinder (80105) is sealed and passes through the sliding seat (80103) and is fixedly connected to the piston column (80106); the inner cavity of the valve body (80101) is composed of a water inlet cavity (80108) and a water blocking cavity (80109); the piston column (80106) is elastically squeezed at the interface between the water inlet cavity (80108) and the water blocking cavity (80109); an internal resistance seat (80100) is also fixed in the inner cavity of the valve body (80101); a compression spring (80107) is sleeved and installed on the outer surface of the telescopic rod of the electric cylinder (80105); one end of the compression spring (80107) is clamped to the piston column (80106), and the other end is clamped to the sliding seat (80103).

6. The underground heat exchange device of a drilling-while-drilling ground-source heat pump according to claim 2, 3 or 4, characterized in that: The water inlet sand filter component (9) further comprises a cone head seat (904), which is fixed at the bottom opening of the filter cartridge (901); an inner rotating seat (906) is fixedly mounted at the middle of the top end of the inner cavity of the filter cartridge (901); and a rotating shaft of the hydraulic impeller (903) is rotatably connected to the inner rotating seat (906).

7. The underground heat exchange device of a drilling-while-drilling ground-source heat pump according to claim 1, 2, 3 or 4, characterized in that: A drain pipe (11) and a main unit water inlet pipe (13) are respectively connected to both sides of the top outlet of the inner tube (4); a drain valve (10) is installed in the main pipe of the drain pipe (11); a main unit water inlet valve (12) is installed in the main pipe of the main unit water inlet pipe (13); a main unit water outlet pipe (14) is connected to the side wall of a group of spiral solid wall pipes (301) at the upper end; a main unit water outlet pipe (14) is installed in the main pipe of the main unit water outlet pipe (14); the other ends of the main unit water inlet pipe (13) and the main unit water outlet pipe (14) are connected to a heat pump unit (16); and one end of the heat pump unit (16) is connected to a user end (17).

8. The underground heat exchange device of the drilling-while-drilling ground-source heat pump according to claim 7, characterized in that: A filter (18) and a water softener (19) are also installed in the main pipeline of the main engine water inlet pipe (13); an external water tank (20) is also installed on one side of the main engine water inlet pipe (13) and the main engine water outlet pipe (14); a booster pump (21) is connected to the water outlet end of the external water tank (20); a forward flushing pipe (22) and a backwashing pipe (24) are respectively connected to the water outlet end of the booster pump (21); the forward flushing pipe (22) is connected to the main engine water outlet pipe (14); the backwashing pipe (24) is connected to the main engine water inlet pipe (13); a forward flushing valve (23) is installed in the main pipeline of the forward flushing pipe (22); a backwashing valve (25) is installed in the main pipeline of the backwashing pipe (24); a backwashing drain pipe (26) is also connected to the main engine water outlet pipe (14); a backwashing drain valve (27) is installed in the main pipeline of the backwashing drain pipe (26).

9. The underground heat exchange device of the drilling-while-drilling ground-source heat pump according to claim 8, characterized in that: The water inlet end of the external water tank (20) is also connected to a water tank inlet pipe (28), and an automatic water supply valve (29) is installed in the main pipe of the water tank inlet pipe (28).

10. The underground heat exchange device of the drilling-while-drilling ground-source heat pump according to claim 8 or 9, characterized in that: A flow meter (32) and a buffer tank (31) are also installed in the main pipe of the main engine water outlet pipe (14); a water supply pipe (30) is also connected to the water outlet end of the booster pump (21); the water supply pipe (30) is connected to the buffer tank (31); and an automatic water supply valve (33) is installed in the main pipe of the water supply pipe (30).

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