A cycle air source heat pump water heater and a control method thereof

Abstract

The application provides a circulating air source heat pump water heater and a control method thereof, and relates to the technical field. The circulating air source heat pump water heater comprises an evaporator, a compressor, a heat exchanger, an expansion valve, a hot water tank, an adjustable heat exchange sheet, a heat accumulator, a heat storage liquid, a plugging mechanism, a heat exchange pipe, a temperature sensing adjusting mechanism, a cooling fin and a heat output mechanism. The evaporator is communicated with the compressor. The output end of the compressor is communicated with the adjustable heat exchange sheet. The adjustable heat exchange sheet is communicated with the expansion valve. The adjustable heat exchange sheet is located in the heat exchanger. The heat exchanger is communicated with the hot water tank. One side of the heat exchanger is provided with the heat accumulator. The circulating air source heat pump water heater and the control method thereof can recycle and store the waste heat generated by the machine, use the waste heat to heat and insulate the hot water tank, defrost the evaporator, reasonably utilize the waste heat and reduce energy waste.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field, and particularly relates to a circulating air source heat pump water heater and a control method thereof. BACKGROUND

[0002] The air source heat pump technology is based on the principle of reverse Carnot cycle, and realizes the transfer of heat from a low-temperature heat source (air) to a high-temperature heat source (water) through the work of a compressor. The circulating air source heat pump water heater, as a typical representative, is usually composed of a compressor, an evaporator, a condenser, a throttling device and a water tank. The working process is as follows: the low-temperature and low-pressure refrigerant gas is compressed into high-temperature and high-pressure gas in the compressor, and then enters the condenser to exchange heat with the water in the water tank, so that the water is heated and the refrigerant is liquefied. The liquid refrigerant is depressurized by the throttling device, enters the evaporator to absorb heat from the air to evaporate into gas, and then returns to the compressor, so as to circulate repeatedly. In this process, the evaporator absorbs heat from the air, the compressor consumes electric energy to improve the energy grade of the refrigerant, and the condenser transfers heat to the water in the water tank to heat the water.

[0003] The existing circulating air source heat pump water heater has various problems in use. For example, in a low-temperature and high-humidity environment, the evaporator surface is prone to frosting. The existence of frost layer increases the heat transfer thermal resistance, and further reduces the heat exchange efficiency of the evaporator. In addition, the hot water in the water heater is usually defrosted. During the operation of the water heater, the water temperature fluctuation problem of the water tank is more prominent. When the unit is defrosted, the temperature of the hot water participating in defrosting decreases and returns to the water tank, which can cause the overall water temperature of the water tank to decrease. In addition, when the water tank is water-distributed, the low-temperature supply water directly enters the water tank and mixes with the original hot water in the water tank, which can also cause a large fluctuation of the water temperature, and can affect the user experience (at the same time, when the water temperature of the water tank is too high, it can also affect the user experience). SUMMARY

[0004] Based on the technical problems in the background art, the present application provides a circulating air source heat pump water heater and a control method thereof.

[0005] The circulating air source heat pump water heater provided by the present application comprises an evaporator, a compressor, a heat exchanger, an expansion valve and a hot water tank. The evaporator and the compressor are communicated. The output end of the compressor is communicated with an adjustable heat exchange fin. The adjustable heat exchange fin is communicated with the expansion valve. The adjustable heat exchange fin is located in the heat exchanger. The heat exchanger is communicated with the hot water tank.

[0006] One side of the heat exchanger is provided with a heat accumulator. The heat accumulator is filled with heat storage liquid. The hot water tank is provided with a heat exchange pipe. The heat accumulator and the heat exchange pipe are communicated.

[0007] The hot water tank is provided with a blocking mechanism, which can block the heat exchange pipe;

[0008] The hot water tank is provided with a temperature sensing adjusting mechanism, which drives the blocking mechanism switch;

[0009] The temperature sensing adjusting mechanism can also adjust the heat exchange area of the heat exchange sheet;

[0010] One side of the evaporator is provided with a cooling fin, and the heat accumulator is provided with a heat output mechanism, which can transmit the heat in the heat accumulator to the cooling fin, and the heat output mechanism can also transmit the heat in the heat accumulator to the heat exchange pipe.

[0011] Preferably, the adjustable heat exchange sheet comprises a first heat exchange sleeve and a second heat exchange sleeve, the first heat exchange sleeve is fixedly installed in the heat exchanger, the first heat exchange sleeve is sleeved on one side of the second heat exchange sleeve, 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 arranged in the heat exchanger.

[0012] The temperature sensing adjusting mechanism can adjust the sliding of the second heat exchange sleeve in the heat exchanger.

[0013] Preferably, the heat accumulator comprises a heat preservation heat accumulator, and a heat exchange mechanism is arranged between the heat exchanger and the heat preservation heat accumulator, which can transmit the heat in the heat exchanger to the heat preservation heat accumulator.

[0014] Preferably, the heat exchange mechanism comprises a first heat preservation sleeve, a heat conduction block, a heat exchange sheet and a blocking assembly; the first heat preservation sleeve is installed between the heat exchanger and the heat preservation heat accumulator, and the two sides of the first heat preservation sleeve are respectively communicated with the heat exchanger and the heat preservation heat accumulator; the heat conduction block is installed in the first heat preservation sleeve and blocks the heat conduction block; the two sides of the heat conduction block are respectively located in the heat exchanger and the heat preservation heat accumulator.

[0015] The heat exchange sheet is located in the heat preservation heat accumulator, and the heat exchange sheet is fixedly connected to one side of the heat conduction block.

[0016] The blocking assembly can block the communication opening of the first heat preservation sleeve and the heat exchanger.

[0017] Preferably, the blocking assembly comprises a thermal deformation plate; one side of the thermal deformation plate is fixedly installed at the side opening of the first heat preservation sleeve and the heat exchanger, and the thermal deformation plate can block the side opening of the first heat preservation sleeve in the heat exchanger.

[0018] Preferably, the plugging mechanism comprises a heat-conducting rod and a plugging plate; the heat-conducting rod is installed in the hot water tank, the heat exchange pipe penetrates through the heat-conducting rod, the plugging plate is slidingly installed in the heat-conducting rod, one end of the heat exchange pipe in the heat-conducting rod is provided with a break, the plugging plate can block the two openings of the plugging plate in the heat-conducting rod, a communication hole is formed through the plugging plate, and the communication hole can communicate the two ends of the heat exchange pipe in the heat-conducting rod.

[0019] The temperature sensing and adjusting mechanism can drive the plugging plate to slide in the heat-conducting rod.

[0020] Preferably, the temperature sensing and adjusting mechanism comprises a piston block, a first driving rod, a second driving rod and a thermal expansion liquid; a moving cavity is formed in the heat-conducting rod and slidingly matched with the piston block, the piston block is slidingly arranged in the moving cavity, one end of the first driving rod is fixedly connected with the piston block, the other end of the first driving rod away from the piston block penetrates through the heat-conducting rod, the heat exchanger and extends into the heat exchanger and is fixedly connected with the second heat exchange sleeve;

[0021] One end of the second driving rod is fixedly connected with the other end of the piston block away from the first driving rod, the second driving rod is slidingly arranged in the heat-conducting rod, and the other end of the second driving rod away from the piston block is fixedly connected with the plugging plate;

[0022] 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;

[0023] The other end of the heat-conducting rod away from the hot water tank is sleeved with a second heat preservation sleeve.

[0024] Preferably, the heat output mechanism comprises a heat-conducting box, a movable heat-conducting plate, a functional pipe, a tapered plug and a hard infusion tube; one side of the heat-conducting box is provided with a movable groove, the movable heat-conducting plate is slidingly arranged in the movable groove, the heat dissipation fin is fixedly connected to the side of the movable heat-conducting plate, the number of the functional pipes is two, the two functional pipes are communicated on the side of the heat-conducting box away from the movable groove, the tapered plug is fixedly connected to the side of the movable heat-conducting plate away from the heat dissipation fin, the tapered plug can be inserted into the functional pipe, a tapered groove matched with the tapered plug is formed in the functional pipe, the tapered plug can block the functional pipe, and the two functional pipes are communicated with the heat preservation and heat storage tank.

[0025] The number of the hard infusion tubes is the same as that of the functional pipes and is arranged one by one in correspondence, the hard infusion tube is communicated with the functional pipe, and the other end of the hard infusion tube is communicated with the hot water tank.

[0026] A control method of a circulating air source heat pump water heater, the control method is as follows:

[0027] System initialization, turn on the power, control the mainboard to check whether each component is normal;

[0028] Real-time data acquisition, detecting the water temperature in the hot water tank, detecting the ambient temperature, detecting the system pressure;

[0029] Start heating condition, when the water temperature in the hot water tank is lower than the set lower limit value, trigger the heating instruction;

[0030] Heating process execution, compressor and fan start, water pump transports water;

[0031] Heating stop condition, when the water temperature in the hot water tank reaches the set target value, the compressor, fan and water pump are stopped in turn, and enter the heat preservation state;

[0032] Water replenishment logic, when the water temperature in the hot water tank is lower than the preset water level, the electromagnetic valve opens the water replenishment, and closes after the water replenishment reaches the full water level, if the water temperature drops to the heater threshold value during the water replenishment, the heating cycle is automatically triggered;

[0033] Heat preservation control, the hot water tank adopts a polyurethane heat preservation layer to detect heat dissipation, when the water temperature drops to the heat preservation restart threshold value, the compressor starts at low frequency to maintain the stable water temperature.

[0034] Preferably, when the water temperature in the hot water tank is lower than the lower limit value, the temperature sensing adjusting mechanism drives the blocking plate to slide, and makes the heat exchange pipe keep unobstructed, at this time, the 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 pipe to exchange heat with the water in the hot water tank.

[0035] When the evaporator is frosted, the heat storage tank has stored heat, and the water pump works to transport the heat storage liquid in the heat exchanger to the movable groove to transfer heat to the heat dissipation fin, and then the fan blows the heat to the evaporator for defrosting.

[0036] The circulating air source heat pump water heater has the beneficial effects that: through the evaporator, compressor, heat exchanger, expansion valve, hot water tank, adjustable heat exchange fin, heat storage device, heat storage liquid, blocking mechanism, heat exchange pipe, temperature sensing adjusting mechanism, heat dissipation fin and heat output mechanism, the waste heat generated by the machine can be recycled and stored, and used for heating and heat preservation of the hot water tank, and the evaporator can be defrosted, so that the waste heat is reasonably utilized, and the energy waste is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a whole structure schematic view of the circulating air source heat pump water heater;

[0038] Figure 2 It is a structure schematic view of the adjustable heat exchange fin in the circulating air source heat pump water heater;

[0039] Figure 3A cross-sectional view of a heat exchange mechanism in a circulating air source heat pump water heater according to the present application;

[0040] Figure 4 A structure schematic view of a blocking mechanism in a circulating air source heat pump water heater according to the present application;

[0041] Figure 5 A structure cross-sectional view of a temperature sensing regulating mechanism in a circulating air source heat pump water heater according to the present application;

[0042] Figure 6 A structure schematic view of a heat output mechanism in a circulating air source heat pump water heater according to the present application;

[0043] Figure 7 A structure cross-sectional view of a heat output mechanism in a circulating air source heat pump water heater according to the present application when closed;

[0044] Figure 8 A structure cross-sectional view of a heat output mechanism in a circulating air source heat pump water heater according to the present application when opened.

[0045] In the figure: 1, evaporator; 2, compressor; 3, heat exchanger; 4, expansion valve; 5, hot water tank; 6, heat exchange pipe; 7, heat dissipation fin; 8, No. 1 heat exchange sleeve; 9, No. 2 heat exchange sleeve; 10, heat preservation storage tank; 11, No. 1 heat preservation sleeve; 12, heat conduction block; 13, heat exchange fin; 14, heat-induced deformation plate; 15, heat conduction rod; 16, blocking plate; 17, communication hole; 18, piston block; 19, No. 1 driving rod; 20, No. 2 driving rod; 21, heat expansion liquid; 22, No. 2 heat preservation sleeve; 23, heat conduction box; 24, movable heat conduction plate; 25, functional pipe; 26, conical plug; 27, hard liquid delivery tube. DETAILED DESCRIPTION

[0046] REFERENCE Figures 1-8The application provides a circulating air source heat pump water heater, which comprises an evaporator 1, a compressor 2, a heat exchanger 3, an expansion valve 4 and a hot water tank 5. The evaporator 1 is communicated with the compressor 2. The output end of the compressor 2 is communicated with an adjustable heat exchange sheet. The adjustable heat exchange sheet is communicated with the expansion valve 4. The adjustable heat exchange sheet is located in the heat exchanger 3. The heat exchanger 3 is communicated with the hot water tank 5. The working principles 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 sheet are prior art and are not repeatedly described herein. The adjustable heat exchange sheet can adjust the heat exchange area. The heat exchange area of the adjustable heat exchange sheet 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 reaches the set temperature, the heat exchange area of the adjustable heat exchange sheet is gradually adjusted (the contact area between the adjustable heat exchange sheet and water is reduced), and the water temperature in the hot water tank 5 is gradually heated to the set temperature, so that the temperature in the hot water tank 5 is prevented from being heated too high and the user experience is affected. In actual conditions, for example, when the temperature in the hot water tank 5 is overheated (specific conditions are that the heat exchanger 3 continuously heats but the water consumption of the user suddenly decreases (such as in the night low peak period), and the excessive heat cannot be taken away in time, so that the water temperature continuously rises.In the case of sudden increase in heat production of the solar collector under clear weather (such as strong light at noon), exceeding the heat dissipation capacity of the heat exchanger 3, leading to over-high water temperature, the heat of the water in the heat exchanger 3 will also gradually dissipate. In order not to waste the heat and recycle it, the following design is provided. A heat accumulator is installed on one side of the heat exchanger 3, and the heat accumulator is filled with heat storage liquid. A heat exchange pipe 6 is installed in the hot water tank 5, and the heat accumulator is in communication with the heat exchange pipe 6. The excess heat in the heat exchanger 3 is stored in the heat storage liquid in the heat accumulator. A blocking mechanism is installed on the hot water tank 5, which can block the heat exchange pipe 6. A temperature sensing adjusting mechanism is installed on the hot water tank 5, which drives the blocking mechanism to open. When the water temperature in the hot water tank 5 decreases (in the heat preservation state), the temperature sensing adjusting mechanism drives the blocking mechanism to open, so that the heat exchange pipe 6 is in a smooth state. The water pump works to deliver the heat storage liquid in the heat accumulator to the heat exchange pipe 6 to heat the water in the hot water tank 5, so as to ensure that the water in the hot water tank 5 is kept at a set temperature, ensuring the user's experience and reducing the frequent start-stop of the compressor 2. The temperature sensing adjusting mechanism can also adjust the heat exchange area of the adjustable heat exchange fin. When the water temperature in the hot water tank 5 changes, the temperature sensing adjusting mechanism adjusts the contact area of the adjustable heat exchange fin to change the heat exchange efficiency, so as to avoid overheating of the water in the hot water tank 5. When the water temperature in the hot water tank 5 is too low, the heat exchange area of the adjustable heat exchange fin is increased to improve the heat exchange efficiency. In addition, in actual situations, the evaporator 1 may also be covered with frost. In order to better defrost, the following design is provided. The evaporator 1 is provided with a fin 7 on one side, and a heat output mechanism is installed on the heat accumulator. The heat output mechanism can transfer the heat in the heat accumulator to the fin 7. The heat output mechanism can also transfer the heat in the heat accumulator to the heat exchange pipe 6. When the evaporator 1 is covered with frost, the heat output mechanism can transfer the heat in the heat accumulator to the fin 7, and then the fan works to blow the heat on the fin 7 to the evaporator 1 for defrosting, recycling the heat and reducing energy waste.

[0047] As Figure 1 And Figure 2As shown in the figure, the adjustable heat exchange sheet comprises a first heat exchange sleeve 8 and a second heat exchange sleeve 9, the first heat exchange sleeve 8 is fixedly installed in the heat exchanger 3, the first heat exchange sleeve 8 is sleeved on one side of the second heat exchange sleeve 9, a closed heat exchange cavity is formed between the first heat exchange sleeve 8 and the second heat exchange sleeve 9, the second heat exchange sleeve 9 is slidably arranged in the heat exchanger 3, the temperature sensing adjusting mechanism can adjust the sliding of the second heat exchange sleeve 9 in the heat exchanger 3, the side of the first heat exchange sleeve 8 and the side of the second heat exchange sleeve 9 are both provided with side grooves, the first heat exchange sleeve 8 is sleeved on the side of the second heat exchange sleeve 9 which is provided with the groove, the two side grooves are combined into a relatively closed heat exchange groove with variable space size, at the same time, the second heat exchange sleeve 9 slides in the side groove of the first heat exchange sleeve 8, so that the second heat exchange sleeve 9 can be retracted or extended in the side groove of the first heat exchange sleeve 8, thereby controlling the contact area of the second heat exchange sleeve 9 exposed to the outside, changing the heat exchange area and the heat exchange efficiency, and the structure is simple and the control is convenient.

[0048] As shown in the figure, Figure 1 As shown in the figure, the heat accumulator comprises a heat preservation storage tank 10, a heat exchange mechanism is arranged between the heat preservation storage tank 10 and the heat exchanger 3, the heat exchange mechanism can transfer the heat in the heat exchanger 3 to the heat preservation storage tank 10, and the heat exchange mechanism can store the heat in the heat exchanger 3 in the heat storage liquid in the heat preservation storage tank 10.

[0049] As shown in the figure, Figure 1 and Figure 3As shown, the heat exchange mechanism includes a first insulation sleeve 11, a heat-conducting block 12, a heat exchange plate 13, and a sealing assembly. The first insulation sleeve 11 is installed between the heat exchanger 3 and the heat storage box 10, and both sides of the first insulation sleeve 11 are connected to the heat exchanger 3 and the heat storage box 10, respectively. The heat-conducting block 12 is installed inside the first insulation sleeve 11 and sealed. Both sides of the heat-conducting block 12 are located inside the heat exchanger 3 and the heat storage box 10, respectively. The heat exchange plate 13 is located inside the heat storage box 10 and is fixedly connected to one side of the heat-conducting block 12. The sealing assembly can seal the communication opening between the first insulation sleeve 11 and the heat exchanger 3. The sealing assembly includes a thermodeformable plate 14. The thermodeformable plate 14 is made of shape memory polymer, and one side of the thermodeformable plate 14 is fixedly installed between the first insulation sleeve 11 and the heat storage box 10. At the opening on one side of the heat exchanger 3, the thermodeformable plate 14 can block the opening on one side of the first insulation sleeve 11 located inside the heat exchanger 3. When the thermodeformable plate 14 blocks the side opening of the first insulation sleeve 11, there is a gap between the thermodeformable plate 14 and the heat-conducting block 12, and they will not be in direct contact. When the temperature of the water in the heat exchanger 3 changes, the bending degree of the thermodeformable 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 the actual situation. In addition, the heat exchange plate 13 increases the contact area with the heat storage liquid, which facilitates the transfer and storage of heat. When the temperature inside the heat exchanger 3 is insufficient, the thermodeformable plate 14 blocks the side opening of the first insulation sleeve 11, reducing the heat backflow between the heat-conducting block 12 and the heat exchanger 3.

[0050] like Figure 1 , Figure 4 and Figure 5 As shown, the sealing mechanism includes a heat-conducting rod 15 and a sealing plate 16. The heat-conducting rod 15 is installed inside the hot water tank 5, and the heat exchange tube 6 passes through the heat-conducting rod 15. The sealing plate 16 is slidably installed inside the heat-conducting rod 15. One end of the heat exchange tube 6 inside the heat-conducting rod 15 is disconnected. The sealing plate 16 can block the two openings inside the heat-conducting rod 15. A through hole 17 is provided on the sealing plate 16, which allows the two ends of the heat exchange tube 6 inside the heat-conducting rod 15 to be connected. The temperature-sensing adjustment mechanism can drive the sealing plate 16 to slide inside the heat-conducting rod 15. By sliding the sealing plate 16 inside the heat-conducting rod 15, the unobstructed flow of the heat exchange tube 6 is controlled, thereby controlling the flow of the heat storage liquid. This allows the heat storage liquid to heat the water in the hot water tank 5, utilizing the heat storage.

[0051] like Figure 1 , Figure 4 and Figure 5As shown, the temperature-sensing and regulating mechanism includes a piston block 18, a first drive rod 19, a second drive rod 20, and a thermally expanding liquid 21. A movable cavity is formed within the heat-conducting rod 15, which slides within the piston block 18. The piston block 18 is slidably disposed within the movable cavity. One end of the first drive rod 19 is fixedly connected to the piston block 18, and the end of the first drive rod 19 away from the piston block 18 passes through the heat-conducting rod 15 and the heat exchanger 3, extending into the heat exchanger 3 and being fixedly connected to the second 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 disposed within 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 sealing plate 16. The diameter of the second drive rod 20 is smaller than the diameter of the movable cavity. The thermally expanding liquid 21 fills the piston block 18 near the second drive rod 19. Inside the moving cavity on one side of the drive rod 20, the end of the heat-conducting rod 15 located outside the hot water tank 5 is fitted with a second insulation sleeve 22. During actual operation, the heat-conducting rod 15 senses the temperature change of the water in the hot water tank 5. The thermally expanding liquid 21 is affected by the temperature change and expands and contracts. When the thermally expanding liquid 21 expands and contracts, it drives the piston block 18 to slide in the moving cavity. When the piston block 18 slides, it drives the first drive rod 19 and the second drive rod 20 to move synchronously. When the first drive rod 19 moves, it drives the second heat exchange sleeve 9 to move synchronously, thereby realizing the contact area between the adjustable heat exchange plate and the water and controlling the efficiency of heat exchange. At the same time, the second drive rod 20 drives the sealing plate 16 to move synchronously. The sealing plate 16 controls the unobstructed flow of the heat exchange pipe 6, thereby facilitating the flow of the heat storage liquid for heat exchange and heating of the water in the hot water tank 5.

[0052] like Figure 1 , Figure 6 , Figure 7 and Figure 8As shown, the heat output mechanism includes a heat-conducting box 23, a movable heat-conducting plate 24, functional tubes 25, a conical plug 26, and an infusion tube 27. A movable groove is provided on one side of the heat-conducting box 23, and the movable heat-conducting plate 24 is slidably disposed within the movable groove. A heat sink 7 is fixedly connected to the side of the movable heat-conducting plate 24. There are two functional tubes 25, connected to the side of the heat-conducting box 23 away from the movable groove. A conical plug 26 is fixedly connected to the side of the movable heat-conducting plate 24 away from the heat sink 7. The conical plug 26 can be inserted into the functional tubes 25. A conical groove adapted to the conical plug 26 is provided within the functional tube 25, allowing the conical plug 26 to seal the functional tube 25. Both functional tubes 25 are connected to the heat storage tank 10. In practice, when the heat storage liquid in the heat storage tank 10 stores heat, the volume of the heat storage liquid expands, and the expanding heat storage liquid pushes the conical plug 26... When the conical plug 26 is pushed, it causes the movable heat-conducting plate 24 to slide in the movable groove on the side of the heat-conducting box 23. A heat dissipation cavity is formed between the movable heat-conducting plate 24 and the heat-conducting box 23, which is connected to the two functional pipes 25. The water pump then delivers the heat storage liquid to the heat dissipation cavity for circulation. The movable heat-conducting plate 24 and the heat sink 7 transfer the heat out. The fan blows the heat from the heat sink 7 onto the evaporator 1 for defrosting. In addition, when the heat storage liquid in the heat storage box 10 does not store heat, it 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. 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 and facilitates the flow of the heat storage liquid for defrosting, reducing the possibility of blockage.

[0053] like Figure 1 , Figure 6 , Figure 7 and Figure 8 As shown, the number of infusion tubes 27 is the same as the number of functional tubes 25 and they are set one-to-one. The infusion tubes 27 are connected to the functional tubes 25, and the other end of the infusion tubes 27 is connected to the hot water tank 5. Similarly, when storing and heating the water in the hot water tank 5, it is necessary to ensure that the heat storage liquid in the heat storage tank 10 stores enough heat, which requires keeping the functional tubes 25 unobstructed. To keep the functional tubes 25 unobstructed, the heat storage liquid needs to store enough heat to expand.

[0054] The specific control methods are as follows:

[0055] System initialization, power on, control motherboard self-tests whether each component is normal;

[0056] Real-time data acquisition, monitoring water temperature inside hot water tank 5, ambient temperature, and system pressure;

[0057] Heating conditions are activated when the water temperature in hot water tank 5 is lower than the set lower limit.

[0058] The heating process is executed, compressor 2 and fan start, and water pump delivers liquid water;

[0059] Heating shutdown condition: When the water temperature in hot water tank 5 reaches the set target value, compressor 2, fan and water pump will stop successively and enter the heat preservation state.

[0060] Water replenishment logic: When the water temperature in hot water tank 5 is lower than the preset water level, the solenoid valve opens to replenish water. After replenishing water to the full water level, it closes. If the water temperature drops to the threshold of the heater during the water replenishment process, the heating cycle is automatically triggered.

[0061] For heat preservation control, the hot water tank 5 uses a polyurethane insulation layer to detect heat dissipation. When the water temperature drops to the heat preservation restart threshold, the compressor 2 starts at a low frequency to maintain a stable water temperature.

[0062] When the water temperature in the hot water tank 5 is lower than the lower limit, the temperature sensing and adjustment mechanism drives the sealing plate 16 to slide and keeps the heat exchange tube 6 unobstructed. At this time, the heat storage box 10 has stored heat. The water pump works to transport the heat storage liquid in the heat exchanger 3 to the heat exchange tube 6 to exchange heat with the water in the hot water tank 5.

[0063] When frost forms on the evaporator 1, the heat storage box 10 contains stored heat. The water pump works to transport the heat storage liquid in the heat exchanger 3 to the movable tank, transferring the heat to the heat sink 7. Then, the fan blows the heat to the evaporator 1 to defrost it.

[0064] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A circulating air source heat pump water heater, characterized in that, It includes 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). 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 inside the heat exchanger (3). 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), and 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 connected to the heat exchange pipe (6). The hot water tank (5) is equipped with a sealing mechanism that can seal the heat exchange tube (6). The hot water tank (5) is equipped with a temperature sensing and adjustment mechanism to drive the sealing mechanism switch; The temperature sensing and adjustment mechanism can also adjust the heat exchange area of ​​the adjustable heat exchanger. The evaporator (1) is provided with a heat sink (7) on one side, and a heat output mechanism is installed on the heat storage device. The heat output mechanism can transfer the heat in the heat storage device to the heat sink (7), and the heat output mechanism can also transfer the heat in the heat storage device to the heat exchange tube (6). The sealing mechanism includes a heat-conducting rod (15) and a sealing plate (16); the heat-conducting rod (15) is installed inside the hot water tank (5), the heat exchange tube (6) passes through the heat-conducting rod (15), the sealing plate (16) is slidably installed inside the heat-conducting rod (15), one end of the heat exchange tube (6) inside the heat-conducting rod (15) is disconnected, the sealing plate (16) can seal the two openings of the sealing plate (16) inside the heat-conducting rod (15), and a through hole (17) is provided on the sealing plate (16), the through hole (17) can connect the two ends of the heat exchange tube (6) inside the heat-conducting rod (15); The temperature-sensing adjustment mechanism can drive the sealing plate (16) to slide inside the heat-conducting rod (15); The temperature sensing and regulating mechanism includes a piston block (18), a first drive rod (19), a second drive rod (20), and a thermally expanding liquid (21); the heat-conducting rod (15) has a movable cavity that slides with the piston block (18), the piston block (18) is slidably disposed in the movable cavity, one end of the first drive rod (19) is fixedly connected to the piston block (18), and the end of the first drive rod (19) away from the piston block (18) passes through the heat-conducting rod (15), the heat exchanger (3), and extends into the heat exchanger (3) and is fixedly connected to the second 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 disposed inside 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 sealing plate (16). The diameter of the second drive rod (20) is smaller than the diameter of the moving cavity, and the thermal expansion liquid (21) fills the moving cavity of the piston block (18) on the side close to the second drive rod (20); The heat-conducting rod (15) is fitted with a No. 2 heat-insulating sleeve (22) at one end outside the hot water tank (5); The heat output mechanism includes a heat-conducting box (23), a movable heat-conducting 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-conducting box (23), the movable heat-conducting plate (24) is slidably disposed in the movable groove, the heat sink (7) is fixedly connected to the side of the movable heat-conducting plate (24), there are two functional tubes (25), the two functional tubes (25) are connected to the side of the heat-conducting box (23) away from the movable groove, the conical plug (26) is fixedly connected to the side of the movable heat-conducting plate (24) away from the heat sink (7), the conical plug (26) can be inserted into the functional tube (25), the functional tube (25) is provided with a conical groove that matches the conical plug (26), the conical plug (26) can block the functional tube (25), and both functional tubes (25) are connected to the heat storage box (10); The number of infusion tubes (27) is the same as the number of functional tubes (25) and they are set one-to-one. The infusion tubes (27) are connected to the functional tubes (25), and the other end of the infusion tubes (27) is connected to the hot water tank (5).

2. The circulating air source heat pump water heater according to claim 1, characterized in that, The adjustable heat exchange plate includes a first heat exchange sleeve (8) and a second heat exchange sleeve (9). The first heat exchange sleeve (8) is fixedly installed inside the heat exchanger (3). The first heat exchange sleeve (8) is fitted onto one side of the second heat exchange sleeve (9). A closed heat exchange cavity is formed between the first heat exchange sleeve (8) and the second heat exchange sleeve (9). The second heat exchange sleeve (9) is slidably disposed inside the heat exchanger (3). The temperature-sensing adjustment mechanism can adjust the sliding of the second heat exchange sleeve (9) within the heat exchanger (3).

3. A circulating air source heat pump water heater according to claim 1, characterized in that, The heat storage device includes an insulated heat storage box (10); a heat exchange mechanism is provided between the insulated heat storage box (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 box (10).

4. A circulating air source heat pump water heater according to claim 3, characterized in that, The heat exchange mechanism includes a first insulation sleeve (11), a heat-conducting block (12), a heat exchange plate (13), and a sealing assembly; the first insulation sleeve (11) is installed between the heat exchanger (3) and the heat storage box (10), and the two sides of the first insulation sleeve (11) are respectively connected to the heat exchanger (3) and the heat storage box (10); the heat-conducting block (12) is installed inside the first insulation sleeve (11) and the heat-conducting block (12) is sealed; the two sides of the heat-conducting block (12) are respectively located inside the heat exchanger (3) and the heat storage box (10); The heat exchange plate (13) is located inside the heat storage box (10), and the heat exchange plate (13) is fixedly connected to one side of the heat-conducting block (12); The sealing component can seal the connection opening between the No. 1 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 sealing assembly includes a thermodeformable plate (14); one side of the thermodeformable plate (14) is fixedly installed at the opening on the side where the first insulation sleeve (11) communicates with the heat exchanger (3), and the thermodeformable plate (14) can seal the opening on the side of the first insulation sleeve (11) located inside the heat exchanger (3).

6. A control method for a circulating air source heat pump water heater, employing a circulating air source heat pump water heater as described in any one of claims 1-5, characterized in that, The control method is as follows: System initialization, power on, control motherboard self-tests whether each component is normal; Real-time data acquisition, detection of water temperature in hot water tank (5), detection of ambient temperature, and detection of system pressure; The heating conditions are activated when the water temperature in the hot water tank (5) is lower than the set lower limit. The heating command is then triggered. The heating process is executed, the compressor (2) and the fan start, 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), fan and water pump will stop one after another 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. After replenishing water to the full water level, it closes. If the water temperature drops to the threshold of the heater during the water replenishment process, the heating cycle is automatically triggered. For heat preservation control, the hot water tank (5) uses a polyurethane insulation layer to detect heat dissipation. When the water temperature drops to the heat preservation restart threshold, the compressor (2) starts at a low frequency to maintain a stable water temperature.

7. The control method for a circulating air source heat pump water heater according to claim 6, characterized in that, When the water temperature in the hot water tank (5) is lower than the lower limit, the temperature sensing and adjustment mechanism drives the sealing plate (16) to slide and keeps the heat exchange tube (6) unobstructed. At this time, the heat storage box (10) has stored heat. The water pump works to transport the heat storage liquid in the heat exchanger (3) to the heat exchange tube (6) to exchange heat with the water liquid in the hot water tank (5). When frost forms on the evaporator (1), there is stored heat in the heat storage box (10). The water pump works to transport the heat storage liquid in the heat exchanger (3) to the moving tank, transfer the heat to the heat sink (7), and then the fan blows the heat to the evaporator (1) to defrost.

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