Circulating type air source heat pump water heater and control method thereof

Abstract

The invention provides a circulating type air source heat pump water heater and a control method thereof, and relates to the technical field, the circulating type air source heat pump water heater comprises an evaporator, a compressor, a heat exchanger, an expansion valve and a hot water tank, the evaporator communicates with the compressor, the output end of the compressor communicates with an adjustable heat exchange piece, and the adjustable heat exchange piece communicates with the expansion valve; the adjustable heat exchange pieces are located in the heat exchanger, and the heat exchanger is communicated with the hot water tank. And a heat reservoir is mounted on one side of the heat exchanger. According to the circulating type air source heat pump water heater and the control method thereof, through the arrangement of an evaporator, a compressor, a heat exchanger, an expansion valve, a hot water tank, an adjustable heat exchange piece, a heat storage device, heat storage liquid, a plugging mechanism, a heat exchange pipe, a temperature sensing adjusting mechanism, cooling fins and a heat output mechanism, waste heat generated by the machine can be recycled and stored; the water heater is used for heating and heat preservation of the hot water tank and defrosting treatment of the evaporator, waste heat is reasonably utilized, and energy waste is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field, and in particular to a circulating air source heat pump water heater and a control method thereof. Background Art

[0002] Air source heat pump technology is based on the principle of reverse Carnot cycle. It realizes the transfer of heat from low-temperature heat source (air) to high-temperature heat source (water) through the work of the compressor. The circulating air source heat pump water heater is a typical representative of them. It is usually composed of main components such as compressor, evaporator, condenser, throttling device and water tank. Its working process is as follows: low-temperature and low-pressure refrigerant gas is compressed into high-temperature and high-pressure gas in the compressor, and then enters the condenser, where it exchanges heat with the water in the water tank, releasing heat to heat the water, and the refrigerant itself is cooled and liquefied; after the liquid refrigerant is reduced in pressure by the throttling device, it enters the evaporator to absorb heat from the air and evaporate into gas, and then returns to the compressor, and the cycle repeats. In this process, the evaporator absorbs heat from the air, the compressor consumes electricity to increase the energy quality of the refrigerant, and the condenser transfers heat to the water in the water tank to heat the water.

[0003] Existing circulating air source heat pump water heaters may encounter various problems during use. For example, in a low temperature and high humidity environment, the evaporator surface is very prone to frost. The presence of the frost layer increases the heat transfer resistance and further reduces the heat exchange efficiency of the evaporator. In addition, the hot water in the water heater is often defrosted. During the operation of the water heater, the water temperature fluctuation problem in the water tank is more prominent. After the unit is defrosted, the hot water involved in the defrosting is cooled and flows back to the water tank, which will cause the overall water temperature of the water tank to drop. In addition, when the water tank is distributed, the low-temperature make-up water directly enters the water tank and mixes with the original hot water in the water tank, which will also cause large fluctuations in water temperature and affect the user experience (at the same time, when the water temperature in the water tank is too high, it may also affect the user experience). Summary of the Invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a circulating air source heat pump water heater and a control method thereof.

[0005] The present invention proposes a circulating air source heat pump water heater, comprising an evaporator, a compressor, a heat exchanger, an expansion valve and a hot water tank. The evaporator is connected to the compressor, and the output end of the compressor is connected to an adjustable heat exchange plate, which is connected to the expansion valve. The adjustable heat exchange plate is located inside the heat exchanger, and the heat exchanger is connected to the hot water tank. A heat storage device is installed on one side of the heat exchanger, the heat storage device is filled with heat storage liquid, a heat exchange pipe is installed in the hot water tank, and the heat storage device is connected to the heat exchange pipe; The hot water tank is provided with a blocking mechanism capable of blocking the heat exchange pipe; The hot water tank is equipped with a temperature sensing and regulating mechanism, and the driving and blocking mechanism is switched; The temperature sensing and regulating mechanism can also adjust the heat exchange area of ​​the heat exchange plate; A heat sink is provided on one side of the evaporator, and a heat output mechanism is installed on the heat reservoir. The heat output mechanism can transfer the heat in the heat reservoir to the heat sink, and the heat output mechanism can also transfer the heat in the heat reservoir to the heat exchange tube.

[0006] Preferably, the adjustable heat exchange fin comprises a first heat exchange sleeve and a second heat exchange sleeve, wherein the first heat exchange sleeve is fixedly mounted in the heat exchanger, the first heat exchange sleeve is sleeved on one side of the second heat exchange sleeve, and a closed heat exchange cavity is formed between the first heat exchange sleeve and the second heat exchange sleeve, and the second heat exchange sleeve is slidably mounted in the heat exchanger; The temperature sensing and adjusting mechanism can adjust the sliding of the second heat exchange sleeve in the heat exchanger.

[0007] Preferably, the heat storage device comprises a heat-insulating heat storage tank; a heat exchange mechanism is provided between the heat-insulating heat storage tank and the heat exchanger, and the heat exchange mechanism can transfer the heat in the heat exchanger to the heat-insulating heat storage tank.

[0008] Preferably, the heat exchange mechanism includes a No. 1 thermal insulation sleeve, a heat conductive block, a heat exchange plate and a sealing assembly; the No. 1 thermal insulation sleeve is installed between the heat exchanger and the thermal insulation storage tank, and the two sides of the No. 1 thermal insulation sleeve are respectively connected to the heat exchanger and the thermal insulation storage tank; the heat conductive block is installed in the No. 1 thermal insulation sleeve and seals the heat conductive block, and the two sides of the heat conductive block are respectively located in the heat exchanger and the thermal insulation storage tank; The heat exchange plate is located in the heat preservation and heat storage box, and the heat exchange plate is fixedly connected to one side of the heat conducting block; The blocking component can block the communication opening between the No. 1 thermal insulation sleeve and the heat exchanger.

[0009] Preferably, the sealing assembly includes a thermally deformable plate; one side of the thermally deformable plate is fixedly installed at the opening on one side of the No. 1 insulation sleeve connected to the heat exchanger, and the thermally deformable plate can seal the opening on one side of the No. 1 insulation sleeve located in the heat exchanger.

[0010] Preferably, the blocking mechanism includes a heat-conducting rod and a blocking plate; the heat-conducting rod is installed in the hot water tank, the heat exchange tube passes through the heat-conducting rod, the blocking plate is slidably installed in the heat-conducting rod, the end of the heat exchange tube located in the heat-conducting rod is disconnected, and the blocking plate can block the two openings of the blocking plate located in the heat-conducting rod, and a connecting hole is formed through the blocking plate, and the connecting hole can connect the two ends of the heat exchange tube located in the heat-conducting rod; The temperature sensing and adjusting mechanism can drive the sealing plate to slide in the heat conducting rod.

[0011] Preferably, the temperature sensing and regulating mechanism includes a piston block, a No. 1 drive rod, a No. 2 drive rod, and a thermal expansion liquid; a movable cavity is defined in the heat conducting rod for sliding engagement with the piston block, the piston block is slidably disposed in the movable cavity, one end of the No. 1 drive rod is fixedly connected to the piston block, and the end of the No. 1 drive rod away from the piston block passes through the heat conducting rod and the heat exchanger and extends into the heat exchanger to be fixedly connected to the No. 2 heat exchange sleeve; One end of the second drive rod is fixedly connected to the end of the piston block away from the first drive rod, the second drive rod is slidably arranged in the heat conducting rod, and the end of the second drive rod away from the piston block is fixedly connected to the blocking plate; The diameter of the second driving rod is smaller than the diameter of the moving cavity, and the thermal expansion liquid is filled in the moving cavity on the side of the piston block close to the second driving rod; One end of the heat conducting rod located outside the hot water tank is covered with a No. 2 heat insulation sleeve.

[0012] Preferably, the heat output mechanism includes a heat conduction box, a movable heat conduction plate, a functional tube, a tapered plug and an infusion tube; a movable groove is provided on one side of the heat conduction box, the movable heat conduction plate is slidably arranged in the movable groove, the heat sink is fixedly connected to the side of the movable heat conduction plate, the number of the functional tubes is two, the two functional tubes are connected at a side of the heat conduction box away from the movable groove, the tapered plug is fixedly connected to a side of the movable heat conduction plate away from the heat sink, the tapered plug can be inserted into the functional tube, a tapered groove adapted to the tapered plug is provided in the functional tube, the tapered plug can block the functional tube, and both functional tubes are connected to the thermal insulation storage box; The number of the infusion hard tubes is the same as the number of the functional tubes and they are arranged in a one-to-one correspondence. The infusion hard tubes are connected to the functional tubes, and the other ends of the infusion hard tubes are connected to the hot water tank.

[0013] A control method for a circulating air source heat pump water heater is as follows: Initialize the system, turn on the power, and control the mainboard to self-check whether all components are normal; Real-time data collection, detection of water temperature in the hot water tank, detection of ambient temperature, detection of system pressure; Start heating condition: when the water temperature in the hot water tank is lower than the set lower limit, the heating instruction is triggered; The heating process is executed, the compressor and fan are started, and the water pump delivers water; Heating stop condition: when the water temperature in the hot water tank reaches the set target value, the compressor, fan and water pump will stop one after another and enter the insulation state; Water replenishment logic: when the water temperature in the hot water tank is lower than the preset water level, the solenoid valve opens to replenish water, and closes after the water is replenished to the full water level. During the replenishment process, if the water temperature drops to the heater threshold, the heating cycle is automatically triggered; Insulation control: the hot water tank uses a polyurethane insulation layer to detect heat dissipation. When the water temperature drops to the insulation restart threshold, the compressor starts at a low frequency to maintain a stable water temperature.

[0014] Preferably, when the water temperature in the hot water tank is lower than the lower limit, the temperature sensing and regulating mechanism drives the blocking plate to slide and keeps the heat exchange tube unobstructed. At this time, the heat preservation heat storage tank has stored heat, and the water pump works to transport the heat storage liquid in the heat exchanger to the heat exchange tube for heat exchange with the water in the hot water tank. When frost forms on the evaporator, the heat stored in the thermal insulation storage tank is pumped by the water pump to transport the heat storage liquid in the heat exchanger to the movable tank, transferring the heat to the heat sink, and then the fan blows the heat to the evaporator for defrosting.

[0015] The circulating air source heat pump water heater proposed in the present invention has the following beneficial effects: through the set evaporator, compressor, heat exchanger, expansion valve, hot water tank, adjustable heat exchange plate, heat storage, heat storage liquid, sealing mechanism, heat exchange tube, temperature sensing adjustment mechanism, heat sink and heat output mechanism, the waste heat generated by the machine can be recovered and stored, and used to heat and keep the hot water tank warm, and the evaporator can also be defrosted, so as to rationally utilize the waste heat and reduce energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a circulating air source heat pump water heater proposed by the present invention; Figure 2 This is a structural schematic diagram of an adjustable heat exchanger in a circulating air source heat pump water heater proposed by the present invention; Figure 3 This is a cross-sectional view of a heat exchange mechanism in a circulating air source heat pump water heater proposed by the present invention; Figure 4 This is a structural schematic diagram of a blocking mechanism in a circulating air source heat pump water heater proposed by the present invention; Figure 5 This is a structural cross-sectional view of a temperature sensing and regulating mechanism in a circulating air source heat pump water heater proposed by the present invention; Figure 6 This is a schematic structural diagram of a heat output mechanism in a circulating air source heat pump water heater proposed by the present invention; Figure 7 This is a cross-sectional view of the structure of a circulating air source heat pump water heater proposed by the present invention when the heat output mechanism is closed; Figure 8This is a structural cross-sectional view of a circulating air source heat pump water heater proposed by the present invention when the heat output mechanism is turned on.

[0017] In the figure: 1. Evaporator; 2. Compressor; 3. Heat exchanger; 4. Expansion valve; 5. Hot water tank; 6. Heat exchange tube; 7. Heat sink; 8. Heat exchange jacket No. 1; 9. Heat exchange jacket No. 2; 10. Insulated heat storage tank; 11. Insulation jacket No. 1; 12. Heat conduction block; 13. Heat exchange plate; 14. Thermally deformable plate; 15. Heat conduction rod; 16. Sealing plate; 17. Connecting hole; 18. Piston block; 19. Drive rod No. 1; 20. Drive rod No. 2; 21. Thermal expansion liquid; 22. Insulation jacket No. 2; 23. Heat conduction box; 24. Movable heat conduction plate; 25. Functional tube; 26. Conical plug; 27. Infusion tube. DETAILED DESCRIPTION

[0018] Reference Figures 1-8The present invention proposes a circulating air source heat pump water heater, comprising an evaporator 1, a compressor 2, a heat exchanger 3, an expansion valve 4 and a hot water tank 5. The evaporator 1 is connected to the compressor 2, and the output end of the compressor 2 is connected to an adjustable heat exchange plate, which is connected to the expansion valve 4. The adjustable heat exchange plate is located in the heat exchanger 3, and the heat exchanger 3 is connected to the hot water tank 5. The working principle of the evaporator 1, the compressor 2, the heat exchanger 3, the expansion valve 4, the hot water tank 5 and the adjustable heat exchange plate is the existing technology and will not be redundantly introduced. The adjustable heat exchange plate can adjust its heat exchange area according to the hot water tank 5. The heat exchange area of ​​the adjustable heat exchange plate is adjusted according to the water temperature in the hot water tank 5. For example, when the water temperature in the hot water tank 5 is about to reach the set temperature, the heat exchange area of ​​the adjustable heat exchange plate is gradually adjusted (the contact area between the adjustable heat exchange plate and the water is reduced), and the water temperature in the hot water tank 5 is gradually heated to the set temperature, so as to avoid the temperature in the hot water tank 5 being overheated and affecting the user experience. In actual situations, for example, when the temperature in the hot water tank 5 is overheated (the specific situation is that the heat exchanger 3 continues to heat but the user's water consumption suddenly decreases (such as during the low peak period at night), the excess heat cannot be taken away in time, resulting in a continuous rise in water temperature;In clear weather, the heat generated by the solar collector suddenly increases (such as strong sunlight at noon), which exceeds the heat dissipation capacity of the heat exchanger 3, resulting in excessive water temperature, etc.). The heat of the water in the heat exchanger 3 will also gradually dissipate. In order not to waste its heat and recycle it, the following design is adopted: a heat reservoir is installed on one side of the heat exchanger 3, and the heat reservoir is filled with heat storage liquid. A heat exchange pipe 6 is installed in the hot water tank 5, and the heat reservoir is connected to the heat exchange pipe 6. The excess heat in the heat exchanger 3 is stored in the heat storage liquid in the heat reservoir through the heat reservoir, and the hot water is heated. The hot water tank 5 is provided with a blocking mechanism, which can block the heat exchange pipe 6. The hot water tank 5 is provided with a temperature sensing and regulating mechanism, which drives the blocking mechanism switch. When the water temperature in the hot water tank 5 drops (in the heat preservation state), the temperature sensing and regulating mechanism drives the blocking mechanism to open, so that the heat exchange pipe 6 is in an unobstructed state. The water pump works to transport the heat storage liquid in the liquid reservoir to the heat exchange pipe 6 to heat the water in the hot water tank 5, ensuring that the water in the hot water tank 5 is kept at the set temperature, ensuring the user's use experience, and reducing the frequency of the compressor 2. The temperature sensing regulating mechanism can also adjust the heat exchange area of ​​the adjustable heat exchange plate. At the same time, when the water in the hot water tank 5 is heated to the set temperature, the temperature sensing regulating mechanism senses the temperature change of the water in the hot water tank 5 and adjusts the contact area of ​​the adjustable heat exchange plate to change the heat exchange efficiency, thereby avoiding the water in the hot water tank 5 from being heated too high. When the temperature of the water in the hot water tank 5 is too low, the heat exchange area of ​​the adjustable heat exchange plate is increased to improve the heat exchange efficiency. In addition, in actual situations, frost may also appear on the evaporator 1. To achieve better defrosting, the following design is adopted: a heat sink 7 is provided on one side of the evaporator 1, and a heat output mechanism is installed on the heat reservoir. The heat output mechanism can transfer heat from the heat reservoir to the heat sink 7. The heat output mechanism can also transfer heat from the heat reservoir to the heat exchange tube 6. When frost forms on the evaporator 1, the heat output mechanism can transfer heat from the liquid reservoir to the heat sink 7. The fan then blows the heat from the heat sink 7 to the evaporator 1 for defrosting, reusing the stored heat and reducing energy waste.

[0019] like Figure 1 and Figure 2As shown in the figure, the adjustable heat exchange plate includes a No. 1 heat exchange sleeve 8 and a No. 2 heat exchange sleeve 9. The No. 1 heat exchange sleeve 8 is fixedly installed in the heat exchanger 3. The No. 1 heat exchange sleeve 8 is sleeved on one side of the No. 2 heat exchange sleeve 9. A closed heat exchange cavity is formed between the No. 1 heat exchange sleeve 8 and the No. 2 heat exchange sleeve 9. The No. 2 heat exchange sleeve 9 is slidably arranged in the heat exchanger 3. The temperature sensing adjustment mechanism can adjust the No. 2 heat exchange sleeve 9 to slide in the heat exchanger 3. The sides of the No. 1 heat exchange sleeve 8 and the No. 2 heat exchange sleeve 9 are A side groove is opened, and the No. 1 heat exchange sleeve 8 is sleeved on one side of the groove of the No. 2 heat exchange sleeve 9. The two side grooves are merged into a relatively closed heat exchange groove with changeable space size. At the same time, the No. 2 heat exchange sleeve 9 slides in the side groove of the No. 1 heat exchange sleeve 8, which can make the No. 2 heat exchange sleeve 9 retract or extend in the side groove of the No. 1 heat exchange sleeve 8, thereby controlling the contact area of ​​the No. 2 heat exchange sleeve 9 exposed to the outside world, thereby changing the heat exchange area and changing the heat exchange efficiency. It has a simple structure and is easy to control.

[0020] like Figure 1 As shown in the figure, the heat storage device includes an insulated heat storage tank 10; a heat exchange mechanism is provided between the insulated heat storage tank 10 and the heat exchanger 3, and the heat exchange mechanism can transfer the heat in the heat exchanger 3 to the insulated heat storage tank 10, and the heat in the heat exchanger 3 is transferred to the heat storage liquid in the insulated heat storage tank 10 through the heat exchange mechanism to store heat.

[0021] like Figure 1 and Figure 3As shown in, the heat exchange mechanism includes a No. 1 insulation sleeve 11, a heat-conducting block 12, a heat-exchanging plate 13 and a blocking component; the No. 1 insulation sleeve 11 is installed between the heat exchanger 3 and the heat-insulating storage tank 10, and the two sides of the No. 1 insulation sleeve 11 are respectively connected to the heat exchanger 3 and the heat-insulating storage tank 10, the heat-conducting block 12 is installed in the No. 1 insulation sleeve 11 and blocks the heat-conducting block 12, the two sides of the heat-conducting block 12 are respectively located in the heat exchanger 3 and the heat-insulating storage tank 10, the heat-exchanging plate 13 is located in the heat-insulating storage tank 10, the heat-exchanging plate 13 is fixedly connected to one side of the heat-conducting block 12, the blocking component can block the communication opening between the No. 1 insulation sleeve 11 and the heat exchanger 3, and the blocking component includes a thermo-deformable plate 14; the material of the thermo-deformable plate 14 is a shape memory polymer, and one side of the thermo-deformable plate 14 is fixedly installed between the No. 1 insulation sleeve 11 and the heat At the side opening connected to the exchanger 3, the thermo-deformable plate 14 can block the side opening of the No. 1 insulation sleeve 11 located in the heat exchanger 3. When the thermo-deformable plate 14 blocks the side opening of the No. 1 insulation sleeve 11, there is a gap between the thermo-deformable plate 14 and the heat-conducting block 12, and there is no direct contact. When the temperature of the water in the heat exchanger 3 changes, the bending degree of the thermo-deformable plate 14 changes, and the contact area between the heat-conducting block 12 and the water in the heat exchanger 3 changes, thereby changing the heat transfer efficiency and recovering heat according to actual conditions. In addition, the contact area with the heat storage liquid is increased by the heat exchange plate 13 to facilitate heat transfer and storage. When the temperature in the heat exchanger 3 is not enough, the thermo-deformable plate 14 blocks the side opening of the No. 1 insulation sleeve 11 to reduce the heat backflow between the heat-conducting block 12 and the heat exchanger 3.

[0022] like Figure 1 、 Figure 4 and Figure 5 As shown in , the blocking mechanism includes a heat-conducting rod 15 and a blocking plate 16; the heat-conducting rod 15 is installed in the hot water tank 5, the heat exchange tube 6 passes through the heat-conducting rod 15, and the blocking plate 16 is slidably installed in the heat-conducting rod 15. The end of the heat exchange tube 6 located in the heat-conducting rod 15 is disconnected, and the blocking plate 16 can block the openings at both ends of the blocking plate 16 located in the heat-conducting rod 15. A connecting hole 17 is opened through the blocking plate 16, and the connecting hole 17 can connect the two ends of the heat exchange tube 6 located in the heat-conducting rod 15. The temperature sensing adjustment mechanism can drive the blocking plate 16 to slide in the heat-conducting rod 15. The sliding of the blocking plate 16 in the heat-conducting rod 15 controls the unobstructed condition of the heat exchange tube 6, thereby controlling the flow of the heat storage liquid, and thus being able to control the heat storage to heat the water in the hot water tank 5 and utilize the stored heat.

[0023] like Figure 1 、 Figure 4 and Figure 5As shown in, the temperature sensing and regulating mechanism includes a piston block 18, a No. 1 driving rod 19, a No. 2 driving rod 20 and a thermal expansion liquid 21; a moving cavity that slides with the piston block 18 is opened in the heat conducting rod 15, and the piston block 18 is slidably arranged in the moving cavity, one end of the No. 1 driving rod 19 is fixedly connected to the piston block 18, and the end of the No. 1 driving rod 19 away from the piston block 18 passes through the heat conducting rod 15 and the heat exchanger 3 and extends into the heat exchanger 3 and is fixedly connected to the No. 2 heat exchange sleeve 9, one end of the No. 2 driving rod 20 is fixedly connected to the end of the piston block 18 away from the No. 1 driving rod 19, the No. 2 driving rod 20 is slidably arranged in the heat conducting rod 15, and the end of the No. 2 driving rod 20 away from the piston block 18 is fixedly connected to the sealing plate 16, the diameter of the No. 2 driving rod 20 is smaller than the diameter of the moving cavity, and the thermal expansion liquid 21 is filled in the piston block 18 near the second driving rod 19. In the movable cavity on the side of the No. 1 driving rod 20, the end of the heat conducting rod 15 located outside the hot water tank 5 is covered with a No. 2 insulation sleeve 22. During actual operation, the heat conducting rod 15 senses the temperature change of the water in the hot water tank 5, and the thermal expansion liquid 21 is affected by the temperature change to expand and contract. When the thermal expansion liquid 21 expands and contracts, it will drive the piston block 18 to slide in the movable cavity. When the piston block 18 slides, it will drive the No. 1 driving rod 19 and the No. 2 driving rod 20 to move synchronously. When the No. 1 driving rod 19 moves, it will drive the No. 2 heat exchange sleeve 9 to move synchronously, thereby realizing an adjustable contact area between the heat exchange plate and the water, and controlling the efficiency of heat exchange. At the same time, the No. 2 driving rod 20 drives the sealing plate 16 to move synchronously, and the sealing plate 16 controls the patency of the heat exchange tube 6, thereby facilitating the flow of heat storage liquid for heat exchange to heat the water in the hot water tank 5.

[0024] like Figure 1 、 Figure 6 、 Figure 7 and Figure 8As shown in, the heat output mechanism includes a heat conduction box 23, a movable heat conduction plate 24, a functional tube 25, a tapered plug 26 and an infusion tube 27; a movable groove is provided on one side of the heat conduction box 23, the movable heat conduction plate 24 is slidably arranged in the movable groove, the heat sink 7 is fixedly connected to the side of the movable heat conduction plate 24, and the number of functional tubes 25 is two, the two functional tubes 25 are connected to the side of the heat conduction box 23 away from the movable groove, the tapered plug 26 is fixedly connected to the side of the movable heat conduction plate 24 away from the heat sink 7, the tapered plug 26 can be inserted into the functional tube 25, and a tapered groove adapted to the tapered plug 26 is provided in the functional tube 25, and the tapered plug 26 can block the functional tube 25. Both functional tubes 25 are connected to the heat preservation storage box 10. In actual conditions, when the heat storage liquid in the heat preservation storage box 10 stores heat, the volume of the heat storage liquid expands, and the expanded heat storage liquid pushes the tapered plug 26 to move. Plug 26, when the conical plug 26 is pushed, the conical plug 26 will drive the movable heat conducting plate 24 to slide in the movable groove on the side of the heat conducting box 23, and a heat dissipation cavity connected to the two functional pipes 25 is formed between the movable heat conducting plate 24 and the heat conducting box 23, and then the water pump works to transport the heat storage liquid to the heat dissipation cavity for circulation, and then the movable heat conducting plate 24 and the heat sink 7 transfer the heat, and then the fan works to blow the heat on the heat sink 7 to the evaporator 1 for defrosting operation; in addition, when the heat storage liquid in the heat preservation heat storage box 10 does not store heat, the heat storage liquid cannot expand, the conical plug 26 will not be pushed, and the movable heat conducting plate 24 will not slide. At this time, the heat dissipation cavity has no volume, and since the heat conducting box 23 is close to the evaporator 1, it is easily affected by its temperature, which reduces the freezing of the heat storage liquid in the heat dissipation cavity, can facilitate the flow of the heat storage liquid for defrosting, and reduce the occurrence of blockage.

[0025] like Figure 1 、 Figure 6 、 Figure 7 and Figure 8 As shown in the figure, the number of the infusion hard tubes 27 is the same as the number of the functional tubes 25 and they are arranged in a one-to-one correspondence. The infusion hard tubes 27 are connected to the functional tubes 25, and the other end of the infusion hard tubes 27 is connected to the hot water tank 5. Similarly, when the water in the hot water tank 5 is stored and heated, it is necessary to ensure that the heat storage liquid in the thermal insulation storage tank 10 stores enough heat, which means that the functional tubes 25 need to be kept unobstructed. To keep the functional tubes 25 unobstructed, the heat storage liquid needs to store enough heat to expand.

[0026] The specific control methods are as follows: Initialize the system, turn on the power, and control the mainboard to self-check whether all components are normal; Real-time data collection, detection of water temperature in hot water tank 5, detection of ambient temperature, detection of system pressure; Start heating condition: when the water temperature in the hot water tank 5 is lower than the set lower limit, the heating instruction is triggered; The heating process is executed, compressor 2 and the fan are started, and the water pump delivers water; Heating stop condition: when the water temperature in the hot water tank 5 reaches the set target value, the compressor 2, the fan and the water pump will stop in succession and enter the insulation state; Water replenishment logic: when the water temperature in the hot water tank 5 is lower than the preset water level, the solenoid valve opens to replenish water, and closes after the water is replenished to the full water level. During the replenishment process, if the water temperature drops to the heater threshold, the heating cycle is automatically triggered; Insulation control: the hot water tank 5 uses a polyurethane insulation layer to detect heat dissipation. When the water temperature drops to the insulation restart threshold, the compressor 2 starts at a low frequency to maintain a stable water temperature.

[0027] When the water temperature in the hot water tank 5 is lower than the lower limit, the temperature sensing and regulating mechanism drives the blocking plate 16 to slide, and keeps the heat exchange tube 6 unobstructed. At this time, the heat preservation and heat storage tank 10 has stored heat, and the water pump works to transport the heat storage liquid in the heat exchanger 3 to the heat exchange tube 6 for heat exchange with the water in the hot water tank 5; When frost forms on the evaporator 1, there is heat stored in the heat preservation storage tank 10. The water pump works to transport the heat storage liquid in the heat exchanger 3 to the movable tank, transfers the heat to the heat sink 7, and then the fan blows the heat to the evaporator 1 for defrosting.

[0028] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A circulating air source heat pump water heater, characterized in that: The invention comprises an evaporator (1), a compressor (2), a heat exchanger (3), an expansion valve (4) and a hot water tank (5), wherein the evaporator (1) is connected to the compressor (2), the output end of the compressor (2) is connected to an adjustable heat exchange plate, the adjustable heat exchange plate is connected to the expansion valve (4), the adjustable heat exchange plate is located in the heat exchanger (3), and the heat exchanger (3) is connected to the hot water tank (5); A heat storage device is installed on one side of the heat exchanger (3), the heat storage device is filled with heat storage liquid, a heat exchange pipe (6) is installed in the hot water tank (5), and the heat storage device is in communication with the heat exchange pipe (6); A blocking mechanism is installed on the hot water tank (5), and the blocking mechanism is capable of blocking the heat exchange tube (6); The hot water tank (5) is equipped with a temperature sensing and regulating mechanism, and the driving and blocking mechanism is switched; The temperature sensing and adjusting mechanism can also adjust the heat exchange area of ​​the adjustable heat exchange fins; A heat sink (7) is provided on one side of the evaporator (1), and a heat output mechanism is installed on the heat reservoir. The heat output mechanism can transfer heat in the heat reservoir to the heat sink (7), and the heat output mechanism can also transfer heat in the heat reservoir to the heat exchange tube (6).

2. A circulating air source heat pump water heater according to claim 1, characterized in that: The adjustable heat exchange plate comprises a No. 1 heat exchange sleeve (8) and a No. 2 heat exchange sleeve (9), wherein the No. 1 heat exchange sleeve (8) is fixedly mounted in the heat exchanger (3), the No. 1 heat exchange sleeve (8) is sleeved on one side of the No. 2 heat exchange sleeve (9), a closed heat exchange cavity is formed between the No. 1 heat exchange sleeve (8) and the No. 2 heat exchange sleeve (9), and the No. 2 heat exchange sleeve (9) is slidably arranged in the heat exchanger (3); The temperature sensing and regulating mechanism can adjust the sliding of the second heat exchange sleeve (9) in the heat exchanger (3).

3. A circulating air source heat pump water heater according to claim 1, characterized in that: The heat storage device comprises a heat-insulating heat storage box (10); a heat exchange mechanism is provided between the heat-insulating heat storage box (10) and the heat exchanger (3), and the heat exchange mechanism is capable of transferring heat in the heat exchanger (3) to the heat-insulating heat storage box (10).

4. A circulating air source heat pump water heater according to claim 3, characterized in that: The heat exchange mechanism comprises a No. 1 insulation sleeve (11), a heat conducting block (12), a heat exchange plate (13) and a blocking assembly; the No. 1 insulation sleeve (11) is installed between the heat exchanger (3) and the heat-insulating heat storage tank (10), and two sides of the No. 1 insulation sleeve (11) are respectively connected to the heat exchanger (3) and the heat-insulating heat storage tank (10); the heat conducting block (12) is installed in the No. 1 insulation sleeve (11) and blocks the heat conducting block (12); and two sides of the heat conducting block (12) are respectively located in the heat exchanger (3) and the heat-insulating heat storage tank (10); The heat exchange plate (13) is located in the heat-insulating heat storage box (10), and the heat exchange plate (13) is fixedly connected to one side of the heat-conducting block (12); The blocking component is capable of blocking the communication opening between the first insulation sleeve (11) and the heat exchanger (3).

5. A circulating air source heat pump water heater according to claim 4, characterized in that: The blocking component comprises a thermally deformable plate (14); one side of the thermally deformable plate (14) is fixedly mounted on an opening on one side of the first thermal insulation sleeve (11) communicating with the heat exchanger (3); the thermally deformable plate (14) is capable of blocking the opening on one side of the first thermal insulation sleeve (11) located inside the heat exchanger (3).

6. A circulating air source heat pump water heater according to claim 1, characterized in that: The blocking mechanism comprises a heat-conducting rod (15) and a blocking plate (16); the heat-conducting rod (15) is installed in the hot water tank (5), the heat exchange tube (6) passes through the heat-conducting rod (15), the blocking plate (16) is slidably installed in the heat-conducting rod (15), one end of the heat exchange tube (6) located in the heat-conducting rod (15) is disconnected, the blocking plate (16) can block the openings at both ends of the blocking plate (16) located in the heat-conducting rod (15), a connecting hole (17) is opened through the blocking plate (16), and the connecting hole (17) can connect the two ends of the heat exchange tube (6) located in the heat-conducting rod (15); The temperature sensing and regulating mechanism can drive the sealing plate (16) to slide inside the heat conducting rod (15).

7. A circulating air source heat pump water heater according to claim 6, characterized in that: The temperature sensing and regulating mechanism comprises a piston block (18), a No. 1 driving rod (19), a No. 2 driving rod (20) and a heat expansion liquid (21); a movable cavity is provided in the heat conducting rod (15) for sliding cooperation with the piston block (18), the piston block (18) is slidably arranged in the movable cavity, one end of the No. 1 driving rod (19) is fixedly connected to the piston block (18), and the end of the No. 1 driving rod (19) away from the piston block (18) passes through the heat conducting rod (15) and the heat exchanger (3) and extends into the heat exchanger (3) and is fixedly connected to the No. 2 heat exchange sleeve (9); One end of the second drive rod (20) is fixedly connected to the end of the piston block (18) away from the first drive rod (19), the second drive rod (20) is slidably arranged in the heat conducting rod (15), and the end of the second drive rod (20) away from the piston block (18) is fixedly connected to the blocking plate (16); The diameter of the second driving rod (20) is smaller than the diameter of the moving cavity, and the thermal expansion liquid (21) is filled in the moving cavity on the side of the piston block (18) close to the second driving rod (20); One end of the heat conducting rod (15) located outside the hot water tank (5) is sheathed with a No. 2 heat insulation sleeve (22).

8. The circulating air source heat pump water heater according to claim 1, characterized in that: The heat output mechanism includes a heat conduction box (23), a movable heat conduction plate (24), a functional tube (25), a conical plug (26) and an infusion tube (27); a movable groove is provided on one side of the heat conduction box (23), the movable heat conduction plate (24) is slidably arranged in the movable groove, the heat sink (7) is fixedly connected to the side of the movable heat conduction plate (24), the number of the functional tubes (25) is two, the two functional tubes (25) are connected to the side of the heat conduction box (23) away from the movable groove, the conical plug (26) is fixedly connected to the side of the movable heat conduction plate (24) away from the heat sink (7), the conical plug (26) can be inserted into the functional tube (25), a conical groove adapted to the conical plug (26) is provided in the functional tube (25), the conical plug (26) can block the functional tube (25), and the two functional tubes (25) are both connected to the heat preservation heat storage box (10); The number of the infusion hard tubes (27) is the same as the number of the functional tubes (25) and they are arranged in a one-to-one correspondence. The infusion hard tubes (27) are connected to the functional tubes (25), and the other end of the infusion hard tubes (27) is connected to the hot water tank (5).

9. A control method for a circulating air source heat pump water heater, using a circulating air source heat pump water heater according to any one of claims 1 to 8, characterized in that: The control method is as follows: Initialize the system, turn on the power, and control the mainboard to self-check whether all components are normal; Real-time data collection, detection of water temperature in the hot water tank (5), detection of ambient temperature, detection of system pressure; Start the heating condition, when the water temperature in the hot water tank (5) is lower than the set lower limit, the heating instruction is triggered; The heating process is executed, the compressor (2) and the fan are started, and the water pump delivers water; Heating stop condition: when the water temperature in the hot water tank (5) reaches the set target value, the compressor (2), the fan and the water pump are stopped successively and enter the heat preservation state; Water replenishment logic: when the water temperature in the hot water tank (5) is lower than the preset water level, the solenoid valve opens to replenish water, and closes after the water is replenished to the full water level. During the water replenishment process, if the water temperature drops to the threshold of the heater, the heating cycle is automatically triggered; Insulation control: the hot water tank (5) uses a polyurethane insulation layer to detect heat dissipation. When the water temperature drops to the insulation restart threshold, the compressor (2) starts at a low frequency to maintain the water temperature stable.

10. The control method of a circulating air source heat pump water heater according to claim 9, characterized in that: When the water temperature in the hot water tank (5) is lower than the lower limit, the temperature sensing and regulating mechanism drives the blocking plate (16) to slide, and keeps the heat exchange tube (6) unobstructed. At this time, the heat preservation heat storage tank (10) has stored heat, and the water pump works to transport the heat storage liquid in the heat exchanger (3) to the heat exchange tube (6) to perform heat exchange with the water in the hot water tank (5); When frost forms on the evaporator (1), heat is stored in the heat-insulating heat storage tank (10). The water pump operates to transport the heat storage liquid in the heat exchanger (3) to the movable tank, transfers the heat to the heat sink (7), and then the fan blows the heat toward the evaporator (1) to defrost.

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