A hot dry rock heat pump water heater unit

Abstract

The utility model discloses a kind of hot dry rock heat pump water heater unit, it is related to heat pump water heater unit field, the utility model includes surface layer and hot dry rock layer, the top of surface layer is separately provided with heat pump system and balance filter, the inside of surface layer and hot dry rock layer is equipped with production well and injection well, the inside of injection well is equipped with water injection pipe.The utility model is provided with first solenoid valve, second solenoid valve, shunt pipe and time relay, time relay links first solenoid valve and second solenoid valve and realizes regular backwashing, when the impurities adhered on filter screen filtering surface need to be cleaned, control system can open first solenoid valve and close second solenoid valve, at this time, fluid in water injection pipe flows reversely into water guide pipe through shunt pipe, forms reverse washing water flow, impacts filter screen at water inlet of outlet pipe, and the filtering surface of filter screen can be cleaned quickly by the mode, prevents impurities from blocking filter screen, to improve the cleaning efficiency of filter screen filtering surface, and simplify cleaning procedure.

Description

Technical Field

[0001] This utility model relates to the field of heat pump water heaters, specifically a dry hot rock heat pump water heater. Background Technology

[0002] A hot dry rock heat pump water heater is a high-efficiency, renewable energy system that utilizes medium-deep geothermal energy (typically referring to high-temperature rock masses buried thousands of meters underground, with high temperatures and no water or steam) as a heat source. It extracts this heat through specialized technology to ultimately produce hot water for domestic or industrial use. Essentially, it is a cutting-edge form of ground source heat pump technology. Unlike traditional heat pumps that utilize shallow soil or groundwater, it drills into deeper strata to directly obtain the vast, nearly constant thermal energy from the Earth's interior.

[0003] Existing dry hot rock heat pump water heaters install filters at the bottom of the water inlet and outlet pipes to filter the water and prevent external impurities from entering them, thus protecting the pipes. However, after prolonged use, the filter surface accumulates a lot of impurities, requiring cleaning. Current cleaning methods include disassembling the filter after shutdown or opening the maintenance channel and manually removing the surface impurities using tools such as brushes and high-pressure water guns. This method is time-consuming, labor-intensive, and cumbersome. Alternatively, a small vibration device (such as an electromagnetic vibrator) may be installed on the filter to periodically vibrate and dislodge the impurities, causing them to fall to the bottom of the well or into the sewage channel, reducing manual intervention. However, vibration may affect the structural stability of the filter, thus reducing the cleaning efficiency of the filter surface. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a dry hot rock heat pump water heater unit to solve the technical problem of inconvenience in cleaning impurities attached to the filter screen.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dry hot rock heat pump water heater unit, comprising a surface layer and a dry hot rock layer. A heat pump system and a balancing filter are respectively installed on the top of the surface layer. A production well and a water injection well are provided inside both the surface layer and the dry hot rock layer. A water injection pipe is installed inside the water injection well, and a water outlet pipe is installed inside the production well. The bottom end of the water outlet pipe is connected to a water guide pipe, and protective frames are installed at the bottom ends of both the water outlet pipe and the water injection pipe. Filter screens are installed at the outlet and inlet positions of the water injection pipe. A diversion pipe connects the water injection pipe and the water guide pipe, and a first solenoid valve is installed on the diversion pipe. A time relay is installed on the top of the balancing filter.

[0006] By adopting the above technical solution, the surface layer serves as the installation carrier for the unit, providing a foundation for surface equipment such as the heat pump system and balance filter. It is also the starting point for drilling production wells and injection wells. The dry hot rock layer is the core heat source layer and a storage carrier for medium-deep geothermal energy. Through heat exchange with the injected medium, it provides a stable source of high-temperature heat energy for the system. The water injection pipe is responsible for transporting the low-temperature medium output by the heat pump system to the dry hot rock layer and is the transport carrier for medium injection. The water outlet pipe is used to guide the high-temperature medium after absorbing heat from the dry hot rock layer to the surface and is the core pipeline for heat energy output.

[0007] Furthermore, one end of the water guide pipe is connected to the inlet end of the balance filter, and a second solenoid valve is installed on the water guide pipe near the balance filter.

[0008] By adopting the above technical solution, the water guide pipe is responsible for transporting the high-temperature fluid from the outlet pipe to the balance filter for purification treatment, and serves as a transition channel for the fluid from underground to the surface purification equipment.

[0009] Furthermore, a water supply pipe is connected between the balance filter and the heat pump system, and one end of the water injection pipe is connected to the heat pump system.

[0010] By adopting the above technical solution, the water supply pipe is a pipeline connecting the balance filter and the heat pump system. Its function is to transport the fluid purified and stabilized by the balance filter to the heat pump system, providing a clean medium source for heat energy extraction.

[0011] Furthermore, the filter screen is arranged at an angle and is located above the protective frame.

[0012] By adopting the above technical solutions, debris and impurities in the fluid can be filtered out, preventing them from entering the pipeline system and causing blockages or equipment wear.

[0013] Furthermore, the filter screen is made of 304 stainless steel woven mesh (50-100 mesh).

[0014] By adopting the above technical solution, the filter screen made of 304 stainless steel can adapt to the complex environment of high temperature and high mineralization underground, effectively resist media corrosion, and extend the service life of the filter screen.

[0015] Furthermore, the protective frame is made of 304 stainless steel, and the gap between the guard rods on the protective frame is larger than the mesh diameter of the filter screen.

[0016] By adopting the above technical solution, large particles of impurities in underground rock strata are blocked, forming a first-level protection for the filter screen and preventing large particles of impurities from directly hitting the filter screen.

[0017] Furthermore, the heat pump system consists of four core components—compressor, condenser, throttling device (expansion valve), and evaporator—and three external systems—heat source side system, user side system, and control system.

[0018] By adopting the above technical solution, the heat pump system, which consists of four core components (compressor, condenser, throttling device, and evaporator) and three external systems (heat source side system, user side system, and control system), has the core function of extracting heat energy from dry hot rock layers through thermal circulation, and finally producing hot water for domestic or industrial use, thus realizing the conversion and utilization of heat energy.

[0019] Furthermore, the balancing filter is a pressure balancing self-cleaning filter, which consists of a housing, a retractable piston, a filter element, a differential pressure sensor, a drain valve, and other structures.

[0020] By adopting the above technical solution, it is possible to perform secondary filtration on the fluid extracted from underground to remove residual impurities.

[0021] Furthermore, the bottom of the protective frame is sloped.

[0022] By adopting the above technical solution, the inclined surface design facilitates the sliding of impurities and reduces their accumulation.

[0023] Furthermore, a protective cover is installed on the top of the balanced filter, and a door is installed on the outer surface of the protective cover via a hinge, and a sealing strip is provided on the door. The time relay is located inside the protective cover.

[0024] By adopting the above technical solution, the protective cover is made of UV-resistant modified polycarbonate, which makes it easy for staff to observe the inside of the protective cover.

[0025] In summary, the present invention has the following main advantages: 1. This utility model is equipped with a first solenoid valve, a second solenoid valve, a diversion pipe, and a time relay. The time relay is linked with the first and second solenoid valves to achieve periodic backwashing. When it is necessary to clean the impurities attached to the filter screen, the control system can open the first solenoid valve and close the second solenoid valve. At this time, the fluid in the water injection pipe flows back into the water guide pipe through the diversion pipe, forming a reverse flushing water flow that impacts the filter screen at the water inlet of the outlet pipe. In this way, the filter screen can be cleaned quickly, preventing impurities from clogging the filter screen, thereby improving the cleaning efficiency of the filter screen and simplifying the cleaning steps. 2. This utility model features a protective frame that blocks large particles of impurities from underground rock formations, providing primary protection for the filter screen and preventing large particles from directly impacting it, thus extending the filter screen's lifespan. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the balanced filter structure of this utility model; Figure 3 This is a schematic diagram of the water outlet pipe structure of this utility model; Figure 4 This is a bottom view of the water outlet pipe structure of this utility model; Figure 5 For the present utility model Figure 2 Enlarged structural diagram at point A; Figure 6 For the present utility model Figure 3 A magnified structural diagram at point B in the middle.

[0027] In the diagram: 1. Surface layer; 2. Dry hot rock layer; 3. Heat pump system; 4. Balance filter; 5. Production well; 6. Injection well; 7. Injection pipe; 8. Outlet pipe; 9. Water delivery pipe; 10. Water guide pipe; 11. Diversion pipe; 12. First solenoid valve; 13. Second solenoid valve; 14. Filter screen; 15. Protective frame; 16. Time relay; 17. Protective cover; 18. Door; 19. Heat dissipation hole. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] The embodiments of this utility model will be described below based on its overall structure.

[0030] Example 1: A dry hot rock heat pump water heater unit, such as Figures 1-6 As shown, the system includes a surface layer 1 and a hot dry rock layer 2. A heat pump system 3 and a balance filter 4 are respectively installed on the top of the surface layer 1. Both the surface layer 1 and the hot dry rock layer 2 have production wells 5 and water injection wells 6 inside. The water injection well 6 has a water injection pipe 7 inside, and the production well 5 has a water outlet pipe 8 inside. The surface layer 1 serves as the installation carrier for the unit, providing a foundation for surface equipment such as the heat pump system and the balance filter. It is also the starting point for drilling the production wells and water injection wells. The hot dry rock layer 2 is the core heat source layer and a storage carrier for medium-deep geothermal energy. Through heat exchange with the injected medium, it provides a stable source of high-temperature heat energy for the system. The water injection pipe 7 is responsible for transporting the low-temperature medium output by the heat pump system to the hot dry rock layer and is the transport carrier for medium injection. The water outlet pipe 8 is used to guide the high-temperature medium after absorbing heat from the hot dry rock layer to the surface and is the core pipeline for heat energy output.

[0031] See Figures 1-2 The heat pump system 3 consists of four core components: a compressor, a condenser, a throttling device (expansion valve), and an evaporator, and three external systems: a heat source side system, a user side system, and a control system. The core function of this heat pump system is to extract heat energy from the dry, hot rock layer through thermal circulation, ultimately producing hot water for domestic or industrial use, thus realizing the conversion and utilization of heat energy. The balancing filter 4 is a pressure-balancing self-cleaning filter, composed of a shell, a retractable piston, a filter element, a differential pressure sensor, and a drain valve, etc., to perform secondary filtration on the fluid drawn from underground, removing residual impurities. (The working principles of the above structures are all existing technologies, therefore this application will not describe them in detail here. Furthermore, the above structures are not illustrated in the diagrams, and how they are arranged in the heat pump system 3 and the balancing filter 4 is also existing technology, therefore this application will not describe them further.)

[0032] See Figures 1-4 The bottom end of the outlet pipe 8 is connected to a guide pipe 10, and protective frames 15 are installed at the bottom ends of both the outlet pipe 8 and the injection pipe 7. Filter screens 14 are installed at the outlet of the injection pipe 7 and the inlet of the outlet pipe 8. A diversion pipe 11 connects the injection pipe 7 and the guide pipe 10, and a first solenoid valve 12 is installed on the diversion pipe 11. One end of the guide pipe 10 is connected to the inlet of the balance filter 4, and a second solenoid valve 13 is installed on the guide pipe 10 near the balance filter 4. The guide pipe 10 is responsible for transporting the high-temperature fluid from the outlet pipe 8 to the balance filter 4 for purification treatment, allowing the fluid to flow from underground to... The transition channel of the surface purification equipment, the balance filter 4 and the heat pump system 3 are connected by a water supply pipe 9. One end of the water injection pipe 7 is connected to the heat pump system 3. The water supply pipe 9 is a pipeline connecting the balance filter 4 and the heat pump system 3. Its function is to transport the fluid purified and stabilized by the balance filter 4 to the heat pump system 3, so as to provide a clean medium source for heat energy extraction. The top of the balance filter 4 is equipped with a time relay 16. The time relay 16, the first solenoid valve 12 and the second solenoid valve 13 are all electrically connected to the control system of the heat pump system 3. The backwashing cycle is controlled by a preset program so that the filter screen 14 can be backwashed regularly.

[0033] See Figures 1-6The filter screen 14 is set at an angle and is located above the protective frame 15 to filter debris and impurities in the fluid, preventing them from entering the pipeline system and causing blockage or equipment wear. The filter screen 14 is made of 304 stainless steel woven mesh (50-100 mesh). The filter screen 14 made of 304 stainless steel can adapt to the complex environment of high temperature and high mineralization underground, effectively resist media corrosion, and extend the service life of the filter screen 14. The bottom of the protective frame 15 is set at an angle, which facilitates the sliding of impurities and reduces accumulation.

[0034] Example 2: Based on the above embodiment 1, in order to improve the protective effect on the filter 14, the protective frame 15 will be configured as follows.

[0035] Specifically, the protective frame 15 is made of 304 stainless steel. The gap between the guards on the protective frame 15 is larger than the mesh diameter of the filter screen 14, blocking large particles of impurities in the underground rock strata and forming a first-level protection for the filter screen 14, preventing large particles of impurities from directly hitting the filter screen 14.

[0036] Example 3: Based on the above embodiment 1, in order to improve the protection effect on the time relay 16, the following structure will be set.

[0037] Specifically, a protective cover 17 is installed on the top of the balance filter 4. A door 18 is installed on the outer surface of the protective cover 17 via a hinge, and a sealing strip is provided on the door 18. The time relay 16 is located inside the protective cover 17, and there is a gap between the time relay 16 and the protective cover 17 to shield and protect the time relay 16. Both the protective cover 17 and the door 18 are made of UV-resistant modified polycarbonate, which makes it easy for staff to observe the internal conditions. The surfaces of the protective cover 17 and the door 18 are coated with a nano-level transparent coating material (such as a silica-based coating). Multiple heat dissipation holes 19 are provided on one side of the protective cover 17. The heat dissipation holes 19 facilitate heat dissipation for the time relay 16. A dustproof mesh made of stainless steel is installed inside the heat dissipation holes 19 to prevent external dust from entering.

[0038] The working principle of this utility model is as follows: First, the low-temperature circulating medium (such as antifreeze or water) output by the heat pump system 3 is transported to the dry hot rock layer 2 through the water injection pipe 7 and the water injection well 6. During this process, the protective frame 15 at the bottom of the water injection pipe first blocks large particles of impurities in the underground rock layer (the gap between the protective rods is larger than the mesh of the filter screen, achieving first-level protection), and its bottom sloping design can reduce the accumulation of impurities; the inclined filter screen 14 located above the protective frame further filters debris to prevent impurities from entering the pipeline system. The low-temperature medium fully contacts the high-temperature rock mass in the dry hot rock layer, absorbs heat energy, and its temperature rises. The warm medium enters the water guide pipe 10 through the outlet pipe 8 in the production well 5. At this time, the protective frame 15 and filter screen 14 at the bottom of the outlet pipe 8 will also filter out residual impurities to ensure the cleanliness of the fluid. The high-temperature fluid is transported to the balance filter 4 through the water guide pipe 10. The balance filter 4 performs secondary filtration through the internal filter element to remove small particles. The purified fluid flows back to the heat pump system through the water supply pipe 9. The heat pump system 3 extracts heat energy from the purified high-temperature fluid through the four core components of compressor, condenser, throttling device and evaporator and converts it into hot water for domestic or industrial use (output from the user side system). The time relay 16 at the top of the balance filter 4 is electrically connected to the control system of the heat pump system 3. It triggers backwashing periodically through a preset program. When backwashing of the filter screen 14 is required, the control system opens the first solenoid valve 12 and closes the second solenoid valve 13. The fluid in the water injection pipe 7 flows back into the water guide pipe 10 through the diversion pipe 11, forming a reverse water flow that impacts the filter screen 14 at the inlet of the outlet pipe, thus preventing the accumulation of impurities on the filter screen 14.

[0039] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A hot dry rock heat pump water heater unit, comprising a surface layer (1) and a hot dry rock layer (2), characterized in that: The top of the surface layer (1) is provided with a heat pump system (3) and a balance filter (4). The surface layer (1) and the dry hot rock layer (2) are provided with a production well (5) and a water injection well (6). The water injection well (6) is provided with a water injection pipe (7). The production well (5) is provided with a water outlet pipe (8). The bottom end of the water outlet pipe (8) is connected to a water guide pipe (10). The bottom end of the water outlet pipe (8) and the bottom end of the water injection pipe (7) are both equipped with protective frames (15). The outlet of the water injection pipe (7) and the inlet of the water outlet pipe (8) are both equipped with filter screens (14). The water injection pipe (7) and the water guide pipe (10) are connected by a diversion pipe (11). The diversion pipe (11) is equipped with a first solenoid valve (12). The top of the balance filter (4) is equipped with a time relay (16).

2. The dry hot rock heat pump water heater unit according to claim 1, characterized in that: One end of the water guide pipe (10) is connected to the inlet end of the balance filter (4), and a second solenoid valve (13) is installed on the water guide pipe (10) near the balance filter (4).

3. The dry hot rock heat pump water heater unit according to claim 1, characterized in that: A water supply pipe (9) is connected between the balance filter (4) and the heat pump system (3), and one end of the water injection pipe (7) is connected to the heat pump system (3).

4. The dry hot rock heat pump water heater unit according to claim 1, characterized in that: The filter (14) is inclined and is located above the protective frame (15).

5. A dry hot rock heat pump water heater unit according to claim 1, characterized in that: The filter screen (14) is made of 304 stainless steel woven mesh.

6. A dry hot rock heat pump water heater unit according to claim 1, characterized in that: The protective frame (15) is made of 304 stainless steel, and the gap between the guard rods on the protective frame (15) is larger than the mesh diameter of the filter screen (14).

7. A dry hot rock heat pump water heater unit according to claim 1, characterized in that: The heat pump system (3) consists of four core components: compressor, condenser, throttling device and evaporator, and three external systems: heat source side system, user side system and control system.

8. A dry hot rock heat pump water heater unit according to claim 1, characterized in that: The balanced filter (4) is a pressure balanced self-cleaning filter, which consists of a shell, a retractable piston, a filter element, a differential pressure sensor, a drain valve and other structures.

9. A dry hot rock heat pump water heater unit according to claim 1, characterized in that: The bottom of the protective frame (15) is sloped.

10. A dry hot rock heat pump water heater unit according to claim 1, characterized in that: The top of the balance filter (4) is also equipped with a protective cover (17), and the outer surface of the protective cover (17) is fitted with a door (18) by a hinge, and the door (18) is provided with a sealing strip. The time relay (16) is located inside the protective cover (17).

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