Ground source heat pump water heater and using method thereof

Abstract

The invention belongs to the technical field of geothermal energy exploitation and utilization, and particularly relates to a ground source heat pump water heater which comprises a rack, and a heat pump, a first heat exchanger, a second heat exchanger and an energy storage box are installed on the rack. A buffer box and a controller used for controlling the pipeline to be communicated are further mounted on the rack; and a temperature sensor is mounted in the buffer box. Intelligent regulation and control according to the temperature of circulating water are achieved through the rack, the buffer tank and the regulation and control device, secondary utilization of the circulating water is achieved, efficient secondary utilization is guaranteed only when residual heat of the circulating water is sufficient, and the energy consumption is reduced. Therefore, the technical problem that a traditional ground source heat pump cannot flexibly cope with geothermal changes and achieve efficient utilization of geothermal energy is precisely solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of exploitation and utilization of geothermal energy, and particularly relates to a ground source heat pump water heater and a using method thereof. Background Art

[0002] With the improvement of environmental awareness and the increasing attention to energy utilization efficiency, the deficiencies of traditional hot water supply methods in terms of energy consumption and environmental protection have become increasingly obvious. Due to its advantages of high efficiency, energy conservation and environmental protection, the ground source heat pump technology is gradually becoming a research hotspot in the hot water supply field. However, there are still some problems in the design and use of existing ground source heat pump water heaters, such as low heating efficiency, poor system stability, high maintenance costs, etc.

[0003] A deep geothermal indirect heating system is disclosed in the Chinese utility model patent with the authorization announcement number CN206817586U, which includes a primary heat exchanger, a secondary heat exchanger and a water source heat pump. The deep geothermal resources are applied to residential heating by combining indirect deep geothermal heating with water source heat pump heating. The specific application is as follows: during indirect deep geothermal heating, the geothermal water does not directly enter the end heating system of the user, but the primary heat exchanger is used to transfer the heat to the circulating water in the heating pipe network; in order to further extract the heat of the geothermal water, the geothermal water obtained after the first heat exchange is heat-exchanged through the secondary heat exchanger to provide a basic heat source for the water source heat pump, and the low-grade heat energy is raised to a high-grade heat energy that can meet the heating temperature of the heating pipe network through the water source heat pump, ultimately achieving the full utilization of deep geothermal resources. However, when this deep geothermal indirect heating system is applied in areas with unstable geothermal resources, if the heat of the geothermal water after passing through the primary heat exchanger is less, and then these geothermal waters are supplied to the secondary heat exchanger, it will cause the secondary heat exchanger to be difficult or even unable to effectively utilize the remaining heat in the geothermal water, resulting in a large amount of cost waste. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a ground source heat pump water heater and a using method thereof in view of the deficiencies of the prior art. The present invention can perform intelligent regulation according to the water temperature of the circulating water, realize the secondary utilization of the circulating water, and ensure that efficient secondary utilization is carried out only when the remaining heat of the circulating water is sufficient, thus precisely solving the technical problem that traditional ground source heat pumps cannot flexibly respond to geothermal changes and achieve efficient utilization of geothermal energy.

[0005] This solution is achieved through the following technical measures: A ground source heat pump water heater, comprising a frame and a controller. A heat pump, a first heat exchanger, a second heat exchanger and a storage tank are installed on the frame. A buffer tank and a regulating device for controlling the connection of pipelines are also installed on the frame. A temperature sensor is installed in the buffer tank. The regulating device and the temperature sensor are electrically connected to the controller. The inlet and outlet ends of the heat pump are respectively connected to the outlet of the water heater and the circulating water inlet of the first heat exchanger through pipelines. The circulating water outlet of the first heat exchanger is connected to the inlet end of the buffer tank through a pipeline. The outlet end of the buffer tank is selectively connected to the circulating water inlet of the second heat exchanger or the return port of the water heater through the regulating device. The circulating water outlet of the second heat exchanger is connected to the return port of the water heater through a pipeline. The tap water outlets of the first heat exchanger and the second heat exchanger are connected to the storage tank through pipelines. The heat pump controls the circulating water in the water heater to pass through the ground and absorb geothermal heat. The circulating water after absorbing geothermal heat is transported from the pipeline to the first heat exchanger. The first heat exchanger uses the heat in the circulating water to heat tap water, and transports the heated tap water to the storage tank through the pipeline. The circulating water after being processed by the first heat exchanger is transported to the buffer tank through the pipeline. When the water temperature in the buffer tank measured by the temperature sensor is higher than the threshold, the controller controls the buffer tank to be connected to the second heat exchanger through the regulating device. The circulating water is recycled after passing through the second heat exchanger and then returns, and the second heat exchanger transports the heated tap water to the storage tank through the pipeline. When the water temperature in the buffer tank measured by the temperature sensor is lower than the threshold, the controller controls the circulating water in the buffer tank to directly return.

[0006] Preferably, a first water outlet pipe and a second water outlet pipe are installed on the buffer tank. The first water outlet pipe and the second water outlet pipe are respectively connected to the heat pump and the second heat exchanger. The regulating device includes a valve assembly and a control assembly. The valve assembly is arranged in the buffer tank and is used to block the first water outlet pipe or the second water outlet pipe. The control assembly is arranged in the buffer tank and is used to control the valve assembly. When the water temperature in the buffer tank measured by the temperature sensor is higher than the threshold, the control assembly controls the valve assembly to block the first water outlet pipe and the second water outlet pipe is opened. When the water temperature in the buffer tank measured by the temperature sensor is lower than the threshold, the control assembly controls the valve assembly to block the second water outlet pipe and the first water outlet pipe is opened.

[0007] Preferably, the valve assembly includes a guiding frame and an arc-shaped valve plate. The guiding frame is arranged in the buffer tank and is connected to the inner wall of the buffer tank. The arc-shaped valve plate is slidably installed on the guiding frame. The control assembly controls the sliding of the arc-shaped valve plate. When the arc-shaped valve plate blocks the first water outlet pipe, the second water outlet pipe is connected. When the arc-shaped valve plate blocks the second water outlet pipe, the first water outlet pipe is connected.

[0008] Preferably, the control assembly includes an arc connecting bar, an arc rack, a first bracket, a first rotating shaft and a first rotating gear; the arc connecting bar is connected to the arc valve plate; the arc rack is installed on the arc connecting bar; the first bracket is arranged in the buffer tank and is connected to the inner wall of the buffer tank; the first rotating shaft is rotatably installed on the first bracket; the first rotating gear is fixedly connected to the first rotating shaft, and the first rotating gear is meshed and connected with the arc rack; a driving device for driving the first rotating shaft to rotate is further arranged in the buffer tank; the driving device drives the first rotating shaft to rotate, the first rotating shaft drives the first rotating gear to rotate, the first rotating gear drives the arc rack meshed and connected with it to move, the arc rack drives the arc connecting bar to move, and the arc connecting bar drives the arc valve plate to slide along the guiding frame.

[0009] Preferably, the control assembly further includes a second bracket, a worm and a worm gear; the second bracket is arranged in the buffer tank; the worm is rotatably installed on the second bracket and is in transmission connection with the driving end of the driving device; the worm gear is fixedly connected to the first rotating shaft, and the worm gear is meshed and connected with the worm.

[0010] Preferably, the driving device includes a temperature sensing assembly and a transmission assembly; the temperature sensing assembly includes a temperature sensing cylinder, an outer attached cylinder and a piston rod; the temperature sensing cylinder is arranged in the buffer tank, and the temperature sensing cylinder is filled with inert gas; the outer attached cylinder is connected to the outer wall of the temperature sensing cylinder and is communicated with the internal cavity of the temperature sensing cylinder; the piston rod is slidably installed on the outer attached cylinder, and the piston rod is in transmission connection with the worm through the transmission assembly; when the water temperature in the buffer tank exceeds the threshold value, the inert gas filled in the temperature sensing cylinder expands, the piston rod extends under the action of air pressure, and the piston rod drives the worm to rotate through the transmission assembly.

[0011] Preferably, the transmission assembly includes a straight rack, a second rotating shaft, a second rotating gear, a belt pulley and a transmission belt; the straight rack is slidably installed on the outer attached cylinder and is connected with the piston rod; the second rotating shaft is rotatably installed on the outer attached cylinder; the second rotating gear is fixedly connected to the second rotating shaft, and the second rotating gear is meshed and connected with the straight rack; there are two belt pulleys, and the two belt pulleys are respectively fixedly connected to the second rotating shaft and the worm, and the two belt pulleys are in transmission connection through the transmission belt.

[0012] Preferably, an inner attached heat insulation layer for heat insulation is installed on the inner wall of the buffer tank.

[0013] Preferably, electromagnetic valves are installed on the first water outlet pipe and the second water outlet pipe.

[0014] The present invention also provides a use method of the above-mentioned ground source heat pump water heater, including the following steps: S1: The heat pump controls the circulating water in the water heater to pass through the ground and absorb geothermal heat; S2: The heat pump controls the circulating water to be transported from the pipeline to the first heat exchanger. The first heat exchanger uses the heat in the circulating water to heat the tap water, and transports the heated tap water to the energy storage tank through the pipeline. The circulating water after being processed by the first heat exchanger is transported to the buffer tank through the pipeline. S2a: When the water temperature in the buffer tank measured by the temperature sensor is higher than the threshold value, the controller controls the buffer tank to communicate with the second heat exchanger through the regulating device. The circulating water is recycled after being reused by the second heat exchanger, and the second heat exchanger transports the heated tap water to the energy storage tank through the pipeline. S2b: When the water temperature in the buffer tank measured by the temperature sensor is lower than the threshold value, the controller controls the circulating water in the buffer tank to directly flow back through the regulating device.

[0015] Advantages of the present invention: 1. The present invention realizes intelligent regulation according to the water temperature of the circulating water through the frame, buffer tank and regulating device, realizes the secondary utilization of the circulating water, and ensures that efficient secondary utilization is carried out only when the remaining heat of the circulating water is sufficient, thus precisely solving the technical problem that traditional ground source heat pumps cannot flexibly respond to geothermal changes and achieve efficient geothermal utilization.

[0016] 2. The present invention realizes the function of regulating the circulation path of the circulating water through the first water outlet pipe, the second water outlet pipe, the valve assembly and the control assembly, and achieves the effect of controlling whether the circulating water is reused twice.

[0017] 3. The present invention realizes the function of blocking the first water outlet pipe or the second water outlet pipe through the guiding frame and the arc-shaped valve plate, and achieves the effect of controlling the flow direction of the circulating water. Description of the drawings

[0018] Figure 1 is a schematic structural diagram of a ground source heat pump water heater Figure 1 .

[0019] Figure 2 is a schematic structural diagram of the heat pump and the buffer tank in a ground source heat pump water heater.

[0020] Figure 3 is an exploded structural diagram of the buffer tank, the regulating device and the driving device in a ground source heat pump water heater.

[0021] Figure 4 is a schematic structural diagram of the regulating device and the driving device in a ground source heat pump water heater.

[0022] Figure 5 is a schematic structural diagram of the regulating device in a ground source heat pump water heater.

[0023] Figure 6 is a schematic structural diagram of the control assembly in a ground source heat pump water heater.

[0024] Figure 7 It is a schematic structural diagram of a control component and a driving device in a ground-source heat pump water heater.

[0025] Figure 8 It is Figure 7 an enlarged view of part A in

[0026] Figure 9 It is a schematic structural diagram of the connection of a buffer tank in a ground-source heat pump water heater.

[0027] Figure 10 It is a schematic structure of a ground-source heat pump water heater Figure 2 .

[0028] In the figure: 1 - frame; 11 - heat pump; 12 - first heat exchanger; 13 - second heat exchanger; 14 - energy storage tank; 2 - buffer tank; 21 - first outlet pipe; 22 - second outlet pipe; 23 - inner attached heat insulation layer; 24 - solenoid valve; 3 - regulation device; 31 - valve assembly; 311 - guiding frame; 312 - arc-shaped valve plate; 32 - control component; 321 - arc-shaped connecting bar; 322 - arc-shaped rack; 323 - first bracket; 324 - first rotating shaft; 325 - first rotating gear; 326 - second bracket; 327 - worm; 328 - worm gear; 4 - driving device; 41 - temperature sensing component; 411 - temperature sensing cylinder; 412 - outer attached cylinder; 413 - piston rod; 42 - transmission component; 421 - straight rack; 422 - second rotating shaft; 423 - second rotating gear; 424 - belt pulley; 425 - transmission belt; 5 - pipeline. Specific embodiments

[0029] To clearly illustrate the technical features of this solution, the following will elaborate on this solution through specific embodiments and in combination with its accompanying drawings.

[0030] Refer to Figures 1 - 3: A ground source heat pump water heater, comprising a frame 1 and a controller. A heat pump 11, a first heat exchanger 12, a second heat exchanger 13 and a storage tank 14 are installed on the frame 1. A buffer tank 2 and a regulating device 3 for controlling the connection of a pipeline 5 are also installed on the frame 1. A temperature sensor is installed in the buffer tank 2. The regulating device 3 and the temperature sensor are electrically connected to the controller. The inlet and outlet ends of the heat pump 11 are respectively connected to the outlet of the water heater and the circulating water inlet of the first heat exchanger 12 through the pipeline 5. The circulating water outlet of the first heat exchanger 12 is connected to the inlet end of the buffer tank 2 through the pipeline 5. The outlet end of the buffer tank 2 is selectively connected to the circulating water inlet of the second heat exchanger 13 or the return port of the water heater through the regulating device 3. The circulating water outlet of the second heat exchanger 13 is connected to the return port of the water heater through the pipeline 5. The tap water outlets of the first heat exchanger 12 and the second heat exchanger 13 are connected to the storage tank 14 through the pipeline 5. The heat pump 11 controls the circulating water in the water heater to pass through the ground and absorb geothermal heat. The circulating water after absorbing geothermal heat is transported from the pipeline 5 to the first heat exchanger 12. The first heat exchanger 12 uses the heat in the circulating water to heat tap water, and transports the heated tap water to the storage tank 14 through the pipeline 5. The circulating water after being processed by the first heat exchanger 12 is transported to the buffer tank 2 through the pipeline 5. When the water temperature in the buffer tank 2 measured by the temperature sensor is higher than the threshold value, the controller controls the buffer tank 2 to communicate with the second heat exchanger 13 through the regulating device 3. The circulating water is reused after passing through the second heat exchanger 13 and then returns to the water heater, and the second heat exchanger 13 transports the heated tap water to the storage tank 14 through the pipeline 5. When the water temperature in the buffer tank 2 measured by the temperature sensor is lower than the threshold value, the controller controls the circulating water in the buffer tank 2 to directly return to the water heater through the regulating device 3.

[0031] The present invention realizes intelligent regulation according to the water temperature of the circulating water through the frame 1, the buffer tank 2 and the regulating device 3, ensuring efficient secondary utilization only when the remaining heat of the circulating water is sufficient, thereby solving the technical problems that the traditional ground source heat pump 11 cannot flexibly respond to geothermal changes and achieve efficient utilization of geothermal heat.

[0032] The circulating water in the water heater is circulated through the heat pump 11 and the pipeline 5. When the circulating water in the pipeline 5 is transported underground, it can absorb geothermal heat. The circulating water after absorbing geothermal heat is transported to the first heat exchanger 12. The first heat exchanger 12 uses the heat in the circulating water to heat tap water. The circulating water after being used by the first heat exchanger 12 is transported to the buffer tank 2 through the pipeline 5. The temperature sensor in the buffer tank 2 monitors the water temperature of the circulating water in real time and feeds it back to the controller. The controller controls the flow direction of the circulating water through the regulating device 3 according to the water temperature detection result of the circulating water. When the temperature of the circulating water is higher than the threshold value, the circulating water is input into the second heat exchanger 13 for reuse. The tap water heated by the first heat exchanger 12 and the second heat exchanger 13 is transported to the energy storage tank 14 through the pipeline 5. The circulating water after being used by the second heat exchanger 13 enters the ground again for geothermal heat absorption, so as to control the use cost and efficiently utilize geothermal resources.

[0033] The water heater is powered by a photovoltaic panel and a storage battery (not shown in the figure). The photovoltaic panel and the storage battery are prior arts. When the sunlight is good, the photovoltaic panel generates electricity and stores the electric energy through the storage battery. At the same time, hot water is stored in the energy storage tank 14 through the heat pump 11, the first heat exchanger 12 and the second heat exchanger 13, so as to provide hot water for users in time.

[0034] Refer to Figures 2 - 4 : A first water outlet pipe 21 and a second water outlet pipe 22 are installed on the buffer tank 2. The first water outlet pipe 21 and the second water outlet pipe 22 are respectively communicated with the heat pump 11 and the second heat exchanger 13. The regulating device 3 includes a valve assembly 31 and a control assembly 32. The valve assembly 31 is arranged in the buffer tank 2. The valve assembly 31 is used to block the first water outlet pipe 21 or the second water outlet pipe 2. The control assembly 32 is arranged in the buffer tank 2, and the control assembly 32 is used to control the valve assembly 31. When the water temperature in the buffer tank 2 fed back by the temperature sensor is higher than the threshold value, the controller controls the control assembly 32 to work, so that the valve assembly 31 blocks the first water outlet pipe 21 and the second water outlet pipe 22 is opened. When the water temperature in the buffer tank 2 fed back by the temperature sensor is lower than the threshold value, the controller controls the control assembly 32 to work, so that the valve assembly 31 blocks the second water outlet pipe 22 and the first water outlet pipe 21 is opened.

[0035] The present invention regulates the circulation path of the circulating water through the first water outlet pipe 21, the second water outlet pipe 22, the valve assembly 31 and the control assembly 32 to control whether the circulating water is reused. After the water heater is started, the heat pump 11 controls the circulating water in the water heater to pass through the ground and absorb geothermal heat. Then, the heat pump 11 controls the circulating water to be transported from the pipeline 5 to the first heat exchanger 12. The first heat exchanger 12 uses the heat in the circulating water to heat the tap water, and transports the heated tap water to the energy storage tank 14 through the pipeline 5. The circulating water after being processed by the first heat exchanger 12 is transported to the buffer tank 2 through the pipeline 5. The temperature sensor in the buffer tank 2 monitors the water temperature of the circulating water in real time and feeds it back to the controller. The controller controls the flow direction of the circulating water through the regulating device 3 according to the water temperature detection result of the circulating water. When the temperature of the circulating water is higher than the threshold value, the control assembly 32 controls the valve assembly 31 to block the first water outlet pipe 21, and the second water outlet pipe 22 is opened. After the second heat exchanger 13 reuses the circulating water, the circulating water is transported to the ground to absorb geothermal heat.

[0036] Refer to Figure 4 and Figure 5 : The valve assembly 31 includes a guiding frame 311 and an arc-shaped valve plate 312. The guiding frame 311 is arranged in the buffer tank 2, and the guiding frame 311 is connected to the inner wall of the buffer tank 2; the arc-shaped valve plate 312 is slidably installed on the guiding frame 311. The control assembly 32 controls the arc-shaped valve plate 312 to slide. When the arc-shaped valve plate 312 blocks the first water outlet pipe 21, the second water outlet pipe 22 is communicated; when the arc-shaped valve plate 312 blocks the second water outlet pipe 22, the first water outlet pipe 21 is communicated. Thus, the blocking of the first water outlet pipe 21 or the second water outlet pipe 22 is realized through the guiding frame 311 and the arc-shaped valve plate 312 to control the flow direction of the circulating water.

[0037] The guiding frame 311 and the arc-shaped valve plate 312 are arranged at the connection between the first water outlet pipe 21 and the second water outlet pipe 22 and the buffer tank 2. The circulated water after being treated and utilized by the first heat exchanger 12 is transported to the buffer tank 2 through the pipeline 5. The water temperature of the circulated water is monitored by the temperature sensor in the buffer tank 2 to judge whether its heat is sufficient. According to the detection result, the flow direction of the circulated water is controlled by the regulating device 3. When the temperature of the circulated water is higher than the threshold value, the control component 32 controls the arc-shaped valve plate 312 to slide along the guiding frame 311, so that the arc-shaped valve plate 312 blocks the first water outlet pipe 21, and the second water outlet pipe 22 is opened. The circulated water is transmitted to the second heat exchanger 13 through the second water outlet pipe 22, realizing the reuse of the circulated water by the second heat exchanger 13. The circulated water after being utilized by the second heat exchanger 13 is transported to the ground to absorb geothermal heat. The guiding frame 311 guides the arc-shaped valve plate 312 to control the moving track of the arc-shaped valve plate 312, so that the arc-shaped valve plate 312 can stably block the first water outlet pipe 21 or the second water outlet pipe 22. And when the arc-shaped valve plate 312 blocks the first water outlet pipe 21, it will be misaligned with the second water outlet pipe 22, so that the second water outlet pipe 22 is communicated. When the arc-shaped valve plate 312 blocks the second water outlet pipe 22, it will be misaligned with the first water outlet pipe 21, and the first water outlet pipe 21 is communicated.

[0038] Refer to Figure 4 and Figure 5 : The control component 32 includes an arc-shaped connecting bar 321, an arc-shaped rack 322, a first bracket 323, a first rotating shaft 324 and a first rotating gear 325. The arc-shaped connecting bar 321 is connected to the arc-shaped valve plate 312. The arc-shaped rack 322 is installed on the arc-shaped connecting bar 321. The first bracket 323 is arranged in the buffer tank 2, and the first bracket 323 is connected to the inner wall of the buffer tank 2. The first rotating shaft 324 is rotatably installed on the first bracket 323. The first rotating gear 325 is fixedly connected to the first rotating shaft 324. The first rotating gear 325 is meshed and connected with the arc-shaped rack 322. A driving device 4 for driving the first rotating shaft 324 to rotate is also arranged in the buffer tank 2. The driving device 4 drives the first rotating shaft 324 to rotate. The first rotating shaft 324 drives the first rotating gear 325 to rotate. The first rotating gear 325 drives the arc-shaped rack 322 meshed and connected with it to move. The arc-shaped rack 322 drives the arc-shaped connecting bar 321 to move. The arc-shaped connecting bar 321 drives the arc-shaped valve plate 312 to slide along the guiding frame 311, so as to control the sliding of the arc-shaped valve plate 312 through the arc-shaped connecting bar 321, the arc-shaped rack 322, the first bracket 323, the first rotating shaft 324 and the first rotating gear 325.

[0039] Refer to Figures 4 - 6: The control component 32 further includes a second bracket 326, a worm 327, and a worm gear 328. The second bracket 326 is disposed inside the buffer tank 2. The worm 327 is rotatably mounted on the second bracket 326, and the worm 327 is in transmission connection with the driving end of the driving device 4. The worm gear 328 is fixedly connected to the first rotating shaft 324. The worm gear 328 is in meshing connection with the worm 327. The movement of the arc-shaped valve plate 312 is stably controlled through the second bracket 326, the worm 327, and the worm gear 328, and the self-locking function is achieved through the worm gear 328 and the worm 327 to avoid the problem that the arc-shaped valve plate 312 moves by itself under the action of water flow impact.

[0040] Refer to Figure 4 , Figure 7 and Figure 8 : The driving device 4 includes a temperature sensing component 41 and a transmission component 42. The temperature sensing component 41 includes a temperature sensing cylinder 411, an outer attached cylinder 412, and a piston rod 413. The temperature sensing cylinder 411 is disposed inside the buffer tank 2, and the temperature sensing cylinder 411 is filled with an inert gas. The outer attached cylinder 412 is connected to the outer wall of the temperature sensing cylinder 411, and the outer attached cylinder 412 is in communication with the internal cavity of the temperature sensing cylinder 411. The second bracket 326 is connected to the outer attached cylinder 412. The piston rod 413 is slidably mounted on the outer attached cylinder 412, and the piston rod 413 is in transmission connection with the worm 327 through the transmission component 42. When the water temperature in the buffer tank 2 exceeds the threshold value, the inert gas filled in the temperature sensing cylinder 411 expands, and the piston rod 413 extends under the action of air pressure. The piston rod 413 drives the worm 327 to rotate through the transmission component 42, so as to realize driving the worm 327 to rotate through the temperature sensing component 41 and the transmission component 42.

[0041] Refer to Figure 4 , Figure 7 and Figure 8 : The transmission component 42 includes a straight rack 421, a second rotating shaft 422, a second rotating gear 423, a belt pulley 424, and a transmission belt 425. The straight rack 421 is slidably mounted on the outer attached cylinder 412, and the straight rack 421 is connected to the piston rod 413. The second rotating shaft 422 is rotatably mounted on the outer attached cylinder 412. The second rotating gear 423 is fixedly connected to the second rotating shaft 422. The second rotating gear 423 is in meshing connection with the straight rack 421. There are two belt pulleys 424, and the two belt pulleys 424 are respectively fixedly connected to the second rotating shaft 422 and the worm 327. The two belt pulleys 424 are in transmission connection through the transmission belt 425. After adopting the above structural form, when the piston rod 413 expands and contracts, it drives the worm 327 to rotate.

[0042] After the water heater is started, when the water temperature measured by the temperature sensor in the buffer tank 2 is higher than the threshold value, the inert gas filled in the temperature sensing cylinder 411 expands, and the piston rod 413 extends under the action of air pressure. The piston rod 413 drives the straight rack 421 to move, and the straight rack 421 drives the second rotating gear 423 meshed with it to rotate. The second rotating gear 423 drives the second rotating shaft 422 to rotate. The second rotating shaft 422 drives the worm 327 to rotate through the pulley 424 and the transmission belt 425. The worm 327 drives the worm wheel 328 meshed with it to rotate. The worm wheel 328 drives the first rotating shaft 324 to rotate. The first rotating shaft 324 drives the first rotating gear 325 to rotate. The first rotating gear 325 drives the arc rack 322 meshed with it to move. The arc rack 322 drives the arc connecting bar 321 to move, and further drives the arc valve plate 312 to slide along the guiding frame 311 through the arc connecting bar 321, so that the arc valve plate 312 blocks the first water outlet pipe 21, and the second water outlet pipe 22 is opened. The circulating water is transmitted to the second heat exchanger 13 through the second water outlet pipe 22, and the second heat exchanger 13 reuses the circulating water. The circulating water reused by the second heat exchanger 13 is transported to the ground to absorb geothermal heat.

[0043] Refer to Figure 3 : An inner attached heat insulation layer 23 for heat insulation is installed on the inner wall of the buffer tank 2. The inner attached heat insulation layer 23 is preferably made of foam material. The inner attached heat insulation layer 23 improves the heat insulation performance of the buffer tank 2, and thus reduces the heat loss of the circulating water during the process of storing water in the buffer tank 2.

[0044] Refer to Figure 9 : Solenoid valves 24 are installed on the first water outlet pipe 21 and the second water outlet pipe 22 to control the connection of the first water outlet pipe 21 and the second water outlet pipe 22. When storing water in the buffer tank 2, the first water outlet pipe 21 and the second water outlet pipe 22 are first closed through the solenoid valves 24, and when the water storage in the buffer tank 2 is sufficient, the flow rate of the first water outlet pipe 21 or the second water outlet pipe 22 is reduced.

[0045] The present invention also provides a usage method of the above-mentioned ground source heat pump water heater, including the following steps: S1: The heat pump 11 controls the circulating water in the water heater to pass through the ground and absorb geothermal heat; S2: The heat pump 11 controls the circulating water to be transported from the pipeline 5 to the first heat exchanger 12. The first heat exchanger 12 uses the heat in the circulating water to heat the tap water, and transports the heated tap water to the energy storage tank 14 through the pipeline 5. The circulating water processed by the first heat exchanger 12 is transported to the buffer tank 2 through the pipeline 5; S2a: When the water temperature in the buffer tank 2 measured by the temperature sensor is higher than the threshold value, the controller controls the buffer tank 2 to communicate with the second heat exchanger 13 through the regulating device 3. The circulating water is recycled after passing through the second heat exchanger 13 and then returns, and the second heat exchanger 13 transmits the heated tap water to the energy storage tank 14 through the pipeline 5; S2b: When the water temperature in the buffer tank 2 measured by the temperature sensor is lower than the threshold value, the controller controls the circulating water in the buffer tank 2 to directly return.

[0046] The technical features not described in the present invention can be realized by the prior art and will not be elaborated here. The present invention is not limited to the above specific embodiments, and the changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention shall also fall within the protection scope of the present invention.

Claims

1. A ground source heat pump water heater, characterized in that: The invention comprises a frame (1) and a controller, wherein a heat pump (11), a first heat exchanger (12), a second heat exchanger (13) and an energy storage box (14) are mounted on the frame (1); a buffer box (2) and a control device (3) for controlling the connection of a pipeline (5) are also mounted on the frame (1); a temperature sensor is mounted in the buffer box (2); the control device (3) and the temperature sensor are electrically connected to the controller; the inlet and outlet ends of the heat pump (11) are respectively connected to the outlet of the water heater and the first heat exchanger (12) through the pipeline (5). The circulating water inlet of the first heat exchanger (12) is connected, the circulating water outlet of the first heat exchanger (12) is connected to the inlet end of the buffer tank (2) through a pipe (5), the outlet end of the buffer tank (2) is selectively connected to the circulating water inlet of the second heat exchanger (13) or the reflux port of the water heater through a control device (3), the circulating water outlet of the second heat exchanger (13) is connected to the reflux port of the water heater through a pipe (5), and the tap water outlets of the first heat exchanger (12) and the second heat exchanger (13) are connected to the energy storage tank (14) through a pipe (5); The heat pump (11) controls the circulating water in the water heater to pass through the ground and absorb geothermal heat. The circulating water after absorbing geothermal heat is transported from the pipeline (5) to the first heat exchanger (12). The first heat exchanger (12) uses the heat in the circulating water to heat tap water, and transports the heated tap water to the energy storage tank (14) through the pipeline (5). The circulating water treated by the first heat exchanger (12) is transported to the buffer tank (2) through the pipeline (5). When the water temperature in the buffer tank (2) measured by the temperature sensor is higher than a threshold value, the controller controls the buffer tank (2) to communicate with the second heat exchanger (13) through the control device (3). The circulating water is reused after passing through the second heat exchanger (13) and then flows back. The second heat exchanger (13) transmits the heated tap water to the energy storage tank (14) through the pipeline (5). When the water temperature in the buffer tank (2) measured by the temperature sensor is lower than a threshold value, the controller controls the circulating water in the buffer tank (2) to flow back directly through the control device (3).

2. A ground source heat pump water heater according to claim 1, characterized in that: A first water outlet pipe (21) and a second water outlet pipe (22) are installed on the buffer tank (2), and the first water outlet pipe (21) and the second water outlet pipe (22) are respectively connected to the heat pump (11) and the second heat exchanger (13); The regulating device (3) comprises a valve component (31) and a control component (32); The valve assembly (31) is arranged in the buffer box (2), and the valve assembly (31) is used to block the first water outlet pipe (21) or the second water outlet pipe (22); The control component (32) is disposed in the buffer box (2), and the control component (32) is used to control the valve component (31); When the water temperature in the buffer box (2) measured by the temperature sensor is higher than a threshold value, the control component (32) controls the valve component (31) to block the first water outlet pipe (21), while the second water outlet pipe (22) is opened; when the water temperature in the buffer box (2) measured by the temperature sensor is lower than the threshold value, the control component (32) controls the valve component (31) to block the second water outlet pipe (22), while the first water outlet pipe (21) is opened.

3. A ground source heat pump water heater according to claim 2, characterized in that: The valve assembly (31) comprises a guide frame (311) and an arc-shaped valve plate (312); The guide frame (311) is arranged in the buffer box (2), and the guide frame (311) is connected to the inner wall of the buffer box (2); The arc-shaped valve plate (312) is slidably mounted on the guide frame (311); The control component (32) controls the arc-shaped valve plate (312) to slide; when the arc-shaped valve plate (312) blocks the first water outlet pipe (21), the second water outlet pipe (22) is connected; when the arc-shaped valve plate (312) blocks the second water outlet pipe (22), the first water outlet pipe (21) is connected.

4. A ground source heat pump water heater according to claim 3, characterized in that: The control assembly (32) comprises an arc-shaped connecting bar (321), an arc-shaped rack (322), a first bracket (323), a first rotating shaft (324), and a first rotating gear (325); The arc-shaped connecting strip (321) is connected to the arc-shaped valve plate (312); The arc-shaped rack (322) is mounted on the arc-shaped connecting bar (321); The first bracket (323) is arranged in the buffer box (2), and the first bracket (323) is connected to the inner wall of the buffer box (2); The first rotating shaft (324) is rotatably mounted on the first bracket (323); The first rotating gear (325) is fixedly connected to the first rotating shaft (324), and the first rotating gear (325) is meshingly connected with the arc-shaped rack (322); A driving device (4) for driving the first rotating shaft (324) to rotate is also provided in the buffer box (2); The driving device (4) drives the first rotating shaft (324) to rotate, the first rotating shaft (324) drives the first rotating gear (325) to rotate, the first rotating gear (325) drives the arc-shaped rack (322) meshing with it to move, the arc-shaped rack (322) drives the arc-shaped connecting strip (321) to move, and the arc-shaped connecting strip (321) drives the arc-shaped valve plate (312) to slide along the guide frame (311).

5. A ground source heat pump water heater according to claim 4, characterized in that: The control assembly (32) further includes a second bracket (326), a worm (327) and a worm wheel (328); The second bracket (326) is arranged in the buffer box (2); The worm (327) is rotatably mounted on the second bracket (326), and the worm (327) is drivingly connected to the driving end of the driving device (4); The worm wheel (328) is fixedly connected to the first rotating shaft (324), and the worm wheel (328) is meshingly connected with the worm (327).

6. A ground source heat pump water heater according to claim 5, characterized in that: The driving device (4) comprises a temperature sensing component (41) and a transmission component (42); The temperature sensing component (41) comprises a temperature sensing cylinder (411), an external cylinder (412) and a piston rod (413); The temperature sensing tube (411) is arranged in the buffer box (2), and the temperature sensing tube (411) is filled with an inert gas; The external attached tube (412) is connected to the outer wall of the temperature sensing tube (411), and the external attached tube (412) is in communication with the internal cavity of the temperature sensing tube (411); The piston rod (413) is slidably mounted on the outer cylinder (412), and the piston rod (413) is transmission-connected to the worm (327) via a transmission assembly (42); When the water temperature in the buffer box (2) exceeds a threshold value, the inert gas filled in the temperature sensing tube (411) expands, the piston rod (413) extends under the action of the gas pressure, and the piston rod (413) drives the worm (327) to rotate through the transmission assembly (42).

7. A ground source heat pump water heater according to claim 6, characterized in that: The transmission assembly (42) comprises a spur rack (421), a second rotating shaft (422), a second rotating gear (423), a pulley (424) and a transmission belt (425); The spur rack (421) is slidably mounted on the outer cylinder (412), and the spur rack (421) is connected to the piston rod (413); The second rotating shaft (422) is rotatably mounted on the outer cylinder (412); The second rotating gear (423) is fixedly connected to the second rotating shaft (422), and the second rotating gear (423) is meshingly connected with the spur rack (421); Two pulleys (424) are provided, and the two pulleys (424) are respectively fixedly connected to the second rotating shaft (422) and the worm (327), and the two pulleys (424) are connected in transmission via a transmission belt (425).

8. A ground source heat pump water heater according to claim 7, characterized in that: An internal insulation layer (23) for heat insulation is installed on the inner wall of the buffer box (2).

9. A ground source heat pump water heater according to claim 8, characterized in that: Solenoid valves (24) are installed on the first water outlet pipe (21) and the second water outlet pipe (22).

10. A method for using the ground source heat pump water heater according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: The heat pump (11) controls the circulating water in the water heater to pass through the ground and absorb geothermal heat; S2: The heat pump (11) controls the circulating water to be transported from the pipeline (5) to the first heat exchanger (12); the first heat exchanger (12) uses the heat in the circulating water to heat the tap water, and transports the heated tap water to the energy storage tank (14) through the pipeline (5); the circulating water treated by the first heat exchanger (12) is transported to the buffer tank (2) through the pipeline (5); S2a: When the water temperature in the buffer tank (2) measured by the temperature sensor is higher than a threshold value, the controller controls the buffer tank (2) to communicate with the second heat exchanger (13) through the regulating device (3), the circulating water is reused after passing through the second heat exchanger (13) and then refluxes, and the second heat exchanger (13) transmits the heated tap water to the energy storage tank (14) through the pipeline (5); S2b: When the water temperature in the buffer tank (2) measured by the temperature sensor is lower than a threshold value, the controller controls the circulating water in the buffer tank (2) to directly flow back through the regulating device (3).

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