Water tank for heat pump water heater

Abstract

The invention relates to the technical field of water tanks, and discloses a water tank for a heat pump water heater, which comprises a water tank body used for storing domestic water, a plurality of partition plates arranged in the water tank body and used for dividing the interior of the water tank body into a plurality of cavities, and a plurality of heat exchange tubes respectively arranged in the plurality of cavities, the heat exchange pipes are arranged on the outer surface of the water tank body and used for preheating domestic water in the cavity, the inlet pipe is arranged on the outer surface of the water tank body and used for allowing underground water to enter, and the water inlet ends of the heat exchange pipes penetrate through the outer surface of the water tank body and are connected with the inlet pipe; by arranging the heat exchange pipes, domestic water stored in the water tank body can be preheated in winter, the working energy consumption of the compressor is reduced, energy is saved, meanwhile, long-time high-pressure operation of the compressor is avoided, and the service life of the compressor is ensured.

Description

Technical Field

[0001] This invention relates to the field of water tank technology, and more particularly to water tanks for heat pump water heaters. Background Technology

[0002] A water source heat pump water heater is a device that uses solar energy stored in the Earth's water bodies (such as groundwater, rivers, lakes, seawater, or wastewater) as a heat source / heat sink to efficiently produce hot water for domestic or industrial use through heat pump technology.

[0003] In existing heat pump water heaters, when the water tank is in use, the high-pressure refrigerant gas, which is compressed and heated by the compressor, circulates through the heat exchange tubes to heat the water in the tank. In winter, the water temperature in the tank is low, and the compressor needs a higher compression ratio to bring the water inside the tank to the required temperature. The high compression ratio causes the compressor exhaust temperature to rise abnormally. The compressor operates under high temperature conditions for a long time, which leads to overheating of the windings and increased mechanical wear, thus greatly reducing the lifespan of the compressor. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a water tank for a heat pump water heater.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The water tank of a heat pump water heater includes: Water tank body, used to store domestic water; Several partitions are installed inside the water tank to divide the interior of the water tank into multiple cavities; Several heat exchange tubes are respectively installed inside multiple cavities for preheating the domestic water inside the cavities; An inlet pipe is installed on the outer surface of the water tank and is used for the entry of groundwater. The inlet ends of the plurality of heat exchange tubes penetrate the outer surface of the water tank and are connected to the inlet pipe. The outlet pipe is located on the outer surface of the water tank and is used for the discharge of groundwater. The outlet ends of the plurality of heat exchange pipes penetrate the outer surface of the water tank and are connected to the outlet pipe. The inlet pipe is connected to the outlet pipe through the heat exchange pipe. A first column and a second column, the first column being disposed inside the outlet pipe and the second column being disposed inside the inlet pipe, are configured such that when the first column and the second column move in the same direction along the central axis of the water tank, at least one of the plurality of heat exchange tubes can preheat the domestic water inside the water tank.

[0006] As a further embodiment of the present invention, a sliding sleeve is slidably installed on the outer surface of both the inlet and outlet pipes. Magnetic plates are fixedly installed on the outer surface of both the first and second columns near the sliding sleeve. An electromagnetic plate is fixedly installed on the inner wall of the sliding sleeve near the magnetic plate. There is a magnetic attraction between the electromagnetic plate and the magnetic plate. The sliding sleeve is configured such that when it moves along the central axis of the inlet and outlet pipes, it can drive the first and second columns to move in the same direction along the central axis of the water tank through the magnetic attraction between the electromagnetic plate and the magnetic plate.

[0007] As a further aspect of the present invention, the outer surfaces of the inlet and outlet pipes are provided with driving units that drive the sliding sleeve to move, the driving unit comprising: The mounting plate is fixedly installed between the two sliding sleeves; The gear is mounted on the outer surface of the mounting plate near the water tank body; A rack is fixedly installed on the outer surface of the water tank body, and the gear meshes with the rack; The drive motor is fixedly installed on the outer surface of the mounting plate on the side away from the water tank body. The output end of the drive motor passes through the outer surface of the mounting plate and is fixedly connected to the rotation center of the gear.

[0008] As a further embodiment of the present invention, a conduit is fixedly connected to the top end of the inlet pipe, and the other end of the conduit is fixedly connected to the bottom end of the outlet pipe, and the inlet pipe is connected to the outlet pipe through the conduit.

[0009] As a further embodiment of the present invention, a first through hole is provided at the top of the first column, a rod is slidably inserted inside the first column, a first cover plate is fixedly installed at the bottom end of the rod through the bottom end of the first column, a spring is sleeved at the top end of the rod through the top end of the first column, one end of the spring is fixedly connected to the top end of the first column, the other end of the spring is fixedly connected to the top end of the rod, the first cover plate completely covers the first through hole, and the outer dimensions of the first cover plate are smaller than the outer dimensions of the first column.

[0010] As a further embodiment of the present invention, a third column is fixedly installed on the inner wall of the outlet pipe near the top end, and a plurality of second through holes are opened through the top end of the third column. A discharge pipe is fixedly connected to the outer surface of one side of the third column, and the other end of the discharge pipe passes through the outer surface of the outlet pipe.

[0011] As a further embodiment of the present invention, a column is slidably inserted inside the third column, the column has a polygonal shape, and a second cover plate is fixedly installed at the bottom end of the column through the bottom end of the third column. The second cover plate completely covers multiple second through holes, and the outer dimensions of the second cover plate are smaller than the outer dimensions of the third column.

[0012] As a further embodiment of the present invention, a baffle is fixedly installed at the top of the column through the top of the third column, and a groove is formed on the outer surface of the column near the bottom end. The groove is connected to the discharge pipe, and the first through hole, the discharge pipe and the groove are arranged opposite to the second through hole.

[0013] As a further embodiment of the present invention, a connecting pipe is inserted between the outer surfaces of the middle positions of the plurality of partitions, and a plurality of solenoid valves are provided on the outer surface of the connecting pipe near the outer surface. The solenoid valves are respectively provided on the upper surface of the plurality of partitions, and heat exchangers are provided on the lower surface of the plurality of partitions.

[0014] As a further embodiment of the present invention, the outer surface of the water tank is provided with a plurality of water inlet valves, which are respectively connected to a plurality of cavities inside the water tank. A water outlet pipe is fixedly installed at the bottom of the water tank, and a flow sensor is fixedly installed at the outlet end of the water outlet pipe.

[0015] This invention, by setting up several heat exchange tubes, allows for the preheating of domestic water stored inside the water tank during winter, reducing the compressor's energy consumption and saving energy. At the same time, it avoids prolonged high-pressure operation of the compressor, ensuring its service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the water tank in the heat pump water heater proposed in this invention; Figure 2 This is a schematic diagram of the internal structure of the water tank in the heat pump water heater proposed in this invention; Figure 3 This is a schematic diagram of the partition plate of the water tank in the heat pump water heater proposed in this invention; Figure 4 This is a schematic diagram of the drive unit for the water tank of the heat pump water heater proposed in this invention; Figure 5 This is a schematic diagram of the single-tube heating state of the water tank in the heat pump water heater proposed in this invention. Figure 6 This is a schematic diagram of the multi-tube heating state of the water tank in the heat pump water heater proposed in this invention. Figure 7 This is a schematic diagram of the electromagnetic plate of the water tank in the heat pump water heater proposed in this invention; Figure 8 for Figure 6 Enlarged view of a portion of point A in the middle; Figure 9 This is a schematic diagram of the first column of the water tank in the heat pump water heater proposed in this invention; Figure 10 This is a schematic diagram of the third column of the water tank in the heat pump water heater proposed in this invention; Figure 11 This is a schematic cross-sectional view of the first column of the water tank in the heat pump water heater proposed in this invention. Figure 12 This is a schematic cross-sectional view of the third column of the water tank in the heat pump water heater proposed in this invention; Figure 13 This is a bottom view schematic diagram of the partition of the water tank in the heat pump water heater proposed in this invention.

[0017] In the picture: 100. Water tank body; 110. Inlet valve; 200, Inlet pipe; 300, Outlet pipe; 400, Heat exchange tube; 500, Baffle plate; 600, Solenoid valve; 700, sliding sleeve; 710, electromagnetic plate; 800, Drive unit; 810, Mounting plate; 820, Gear; 830, Rack; 840, Drive motor; 900, First column; 910, First through hole; 1000, Second column; 1100, Magnetic sheet; 1200, Conduit; 1300, Outlet pipe; 1400, Flow sensor; 1500, Third column; 1510, Second through hole; 1520, Discharge pipe; 1600, Rod; 1610, First cover plate; 1620, Spring; 1700, column; 1710, second cover plate; 1720, groove; 1730, baffle. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0019] In order to preheat the water inside the tank with the pumped groundwater, such as Figure 1 and Figure 2 As shown, this invention proposes a water tank for a heat pump water heater, including a tank body 100, several partitions 500, several heat exchange tubes 400, an inlet pipe 200, an outlet pipe 300, a first column 900, and a second column 1000. The tank body 100 stores domestic water. Several partitions 500 are fixedly installed inside the tank body 100 to divide the interior into multiple cavities. Then, several heat exchange tubes 400 are fixedly installed inside each cavity to preheat the domestic water inside the cavities. To allow groundwater to enter the heat exchange tubes 400, as shown... Figure 3 and Figure 4As shown, the inlet pipe 200 is fixedly installed on the outer surface of the water tank 100. The inlet end of the inlet pipe 200 is connected to an external water pump via a flexible hose, allowing groundwater drawn by the water pump to enter the interior of the inlet pipe 200. Since the inlet ends of the plurality of heat exchange tubes 400 penetrate the outer surface of the water tank 100 and are connected to the inlet pipe 200, groundwater enters the interior of the plurality of heat exchange tubes 400 through the inlet pipe 200. Furthermore, since the outlet pipe 300 is fixedly installed on the outer surface of the water tank 100, the outlet ends of the plurality of heat exchange tubes 400... The water inlet 200 penetrates the outer surface of the water tank 100 and is connected to the outlet pipe 300. The inlet pipe 200 is connected to the outlet pipe 300 through the heat exchange pipe 400. The groundwater drawn by the water pump will circulate inside the heat exchange pipe 400 and then flow into the outlet pipe 300, and then be discharged from the outlet end of the outlet pipe 300. With this device, the domestic water stored in the water tank 100 can be preheated in winter, which reduces the energy consumption of the compressor and saves energy. At the same time, it avoids the compressor from running at high pressure for a long time and ensures the service life of the compressor.

[0020] Because the volume of domestic water usage varies, a large amount of groundwater is needed to preheat the entire water tank 100, requiring the water pump to operate at high pressure. To reduce the operating pressure of the water pump by locally preheating the domestic water inside the water tank 100 according to the water usage, such as... Figure 5 and Figure 6 As shown, the first column 900 is disposed inside the outlet pipe 300, slidably installed and in contact with the inner wall of the outlet pipe 300. The second column 1000 is disposed inside the inlet pipe 200, slidably installed and in contact with the inner wall of the inlet pipe 200. When the first column 900 and the second column 1000 move in the same direction along the central axis of the water tank 100 on the inner walls of the inlet pipe 200 and the outlet pipe 300, that is, when the height positions of the first column 900 and the second column 1000 change, it can make if At least one of the heat exchange tubes 400 preheats the domestic water inside the water tank 100. This configuration allows the device to select the heat exchange tubes 400 that need to directly circulate groundwater, i.e., the number of heat exchange tubes 400 participating in the initial circulation of groundwater, thereby heating the domestic water in one or more cavities inside the water tank 100. The amount of domestic water that needs to be preheated can be adjusted in real time. The water pump can adjust the pumping volume according to the number of heat exchange tubes 400, avoiding long-term high-pressure operation of the water pump and saving electricity and energy consumption.

[0021] After groundwater is preheated by heat exchange pipe 400 to the domestic water in the 100-cavity water tank, some residual heat often remains. To avoid this heat waste, such as... Figure 6As shown, a conduit 1200 is fixedly connected to the top end of the inlet pipe 200, and the other end of the conduit 1200 is fixedly connected to the bottom end of the outlet pipe 300. The inlet pipe 200 is connected to the outlet pipe 300 through the conduit 1200. Figure 5 As shown, when at least one of the heat exchange tubes 400 has not participated in the initial circulation of groundwater, because the first column 900 and the second column 1000 respectively separate the interior of the outlet pipe 300 and the inlet pipe 200, dividing the outlet pipe 300 and the inlet pipe 200 into an upper chamber and a lower chamber, the groundwater entering from the inlet pipe 200 will circulate once through the heat exchange tube 400 in the lower chamber of the inlet pipe 200, and then be discharged from the other end of the heat exchange tube 400 into the lower chamber of the outlet pipe 300. Because of the separation by the first column 900, the circulated groundwater flows into the inlet pipe 200 through the conduit 1200. The groundwater flows through the upper cavity of the outlet pipe 300, then through the other heat exchange pipes 400, and finally into the upper cavity of the outlet pipe 300. It is then discharged from the outlet of the upper cavity of the outlet pipe 300 into the water storage tank for subsequent use. This design allows the groundwater that has undergone initial circulation through the heat exchange pipes 400 to re-enter the subsequent heat exchange pipes 400 to preheat the domestic water in the water tank 100 cavity (i.e., through the final circulation of groundwater, the remaining heat exchange pipes 400 continue to preheat the domestic water in the water tank 100 cavity), thus maximizing the utilization of the groundwater's residual heat. It should be noted that because the first column 900 and the second column 1000 separate the interiors of the outlet pipe 300 and the inlet pipe 200, the freshly pumped groundwater will first circulate within the heat exchange pipes 400 of the water tank 100 cavity that needs heating, and then circulate within the remaining heat exchange pipes 400. This will not affect the normal preheating of domestic water by the heat exchange pipes 400.

[0022] In order to enable the first column 900 and the second column 1000 to move within the outlet pipe 300 and the inlet pipe 200, their positions and heights are adjusted, such as... Figure 4 As shown, sliding sleeves 700 are slidably mounted on the outer surfaces of both the inlet pipe 200 and the outlet pipe 300, such as... Figure 5 As shown, magnetic sheets 1100 are fixedly installed on the outer surfaces of the first column 900 and the second column 1000 near the sliding sleeve 700. Figure 7As shown, an electromagnetic plate 710 is fixedly installed on the inner wall of the sliding sleeve 700 near the magnetic plate 1100. The electromagnetic plate 710 and the magnetic plate 1100 have a magnetic attraction. By moving the sliding sleeve 700 along the central axis of the inlet pipe 200 and the outlet pipe 300, the magnetic attraction between the electromagnetic plate 710 and the magnetic plate 1100 can drive the first column 900 and the second column 1000 to move in the same direction along the central axis of the water tank 100, thereby adjusting the height of the first column 900 and the second column 1000. This allows the user to adjust the number of heat exchange tubes 400 participating in the first circulation of groundwater as needed. It should be noted that the magnetic attraction between the electromagnetic plate 710 and the magnetic plate 1100 is strong and will not detach due to water pressure.

[0023] In order to drive the sliding sleeve 700 to move along the central axis of the inlet pipe 200 and the outlet pipe 300, such as Figure 3 and Figure 7 As shown, the outer surfaces of the inlet pipe 200 and the outlet pipe 300 are provided with a drive unit 800 that drives the sliding sleeve 700 to move. The drive unit 800 includes: a mounting plate 810, a gear 820, a rack 830, and a drive motor 840. The mounting plate 810 is fixedly installed between the two sliding sleeves 700. The gear 820 is rotatably installed on the outer surface of the mounting plate 810 near the water tank 100. The rack 830 is fixedly installed on the outer surface of the water tank 100. The drive motor 840 is fixedly installed on the outer surface of the mounting plate 810 away from the water tank 100. The output end of the drive motor 840 passes through the outer surface of the mounting plate 810 and is fixedly connected to the rotation center of the gear 820. The rotation of the output end of the drive motor 840 drives the gear 820 to rotate. The gear 820 meshes with the rack 830, thereby causing the mounting plate 810 to move up and down along the central axis of the inlet pipe 200 and the outlet pipe 300 to adjust its height position.

[0024] like Figure 6 As shown, when all heat exchange tubes 400 are used for direct circulation of groundwater, the circulated groundwater has no subsequent heat exchange tubes 400 for waste heat recovery. To avoid wasting the waste heat of the groundwater, such as... Figure 6 and Figure 8 As shown, a third column 1500 is fixedly installed on the inner wall of the outlet pipe 300 near its top. A discharge pipe 1520 is fixedly connected to the outer surface of one side of the third column 1500. The other end of the discharge pipe 1520 penetrates the outer surface of the outlet pipe 300 and is connected to an external waste heat recovery unit (which can be a floor heating pipe). To enable the discharge pipe 1520 to connect to the external waste heat recovery unit, as follows... Figure 10 and Figure 12As shown, a column 1700 is slidably inserted inside the third column 1500. A groove 1720 is formed on the outer surface of the column 1700 near its bottom end. When the column 1700 slides upwards inside the third column 1500 along its axial direction, the groove 1720 connects with the discharge pipe 1520. At this time, the circulated groundwater enters the external waste heat recovery unit through the groove 1720 and the discharge pipe 1520. Specifically, to restrict the column 1700 to slide only along its axial direction and prevent it from rotating, as... Figure 12 As shown, the column 1700 has a polygonal shape, which restricts the column 1700 from rotating.

[0025] In order to allow the groundwater circulating in the lower cavity of the outlet pipe 300 to flow into the upper cavity of the outlet pipe 300, a first through hole 910 is provided at the top of the first column 900. The groundwater circulating in the lower cavity of the outlet pipe 300 enters the upper cavity of the outlet pipe 300 through the first through hole 910, and then enters the discharge pipe 1520 through the groove 1720.

[0026] When a portion of all heat exchange tubes 400 are not used for direct circulation of groundwater, the remaining heat exchange tubes 400 can still normally collect residual heat from the circulated groundwater. Figure 10 As shown, the top of the third column 1500 is provided with multiple second through holes 1510. The circulated groundwater enters the upper cavity of the outlet pipe 300 and is then discharged into the water storage tank through the second through holes 1510.

[0027] In order to allow the circulated groundwater to be discharged from the outlet pipe 1520 and multiple second through holes 1510, such as Figure 9 , Figure 10 , Figure 11 and Figure 12As shown, a rod 1600 is slidably inserted inside the first column 900. A first cover plate 1610 is fixedly installed at the bottom end of the rod 1600, penetrating the bottom end of the first column 900. A spring 1620 is sleeved at the top end of the rod 1600, penetrating the top end of the first column 900. One end of the spring 1620 is fixedly connected to the top end of the first column 900, and the other end of the spring 1620 is fixedly connected to the top end of the rod 1600. The first cover plate 1610 completely covers the first through hole 910. The outer dimensions of the first cover plate 1610 are smaller than the outer dimensions of the first column 900. A second cover plate 1710 is fixedly installed at the bottom end of the third column 1500, penetrating through the bottom end of the column 1700. The second cover plate 1710 completely covers the multiple second through holes 1510. The outer dimensions of the second cover plate 1710 are smaller than the outer dimensions of the third column 1500. A baffle plate 1730 is fixedly installed at the top end of the column 1700, penetrating through the top end of the third column 1500. The first through hole 910, the discharge pipe 1520, and the groove 1720 are arranged opposite to the second through hole 1510, so they will not interfere with each other, ensuring that the circulated groundwater can be discharged from the discharge pipe 1520 and the multiple second through holes 1510. When at least one heat exchange pipe 400 can recover the residual heat of the groundwater during the final circulation of the groundwater, under the elastic force of the spring 1620, such as Figure 9 As shown, the rod 1600 drives the first cover plate 1610 to seal the first through hole 910. At this time, the circulated groundwater must flow from the lower cavity of the outlet pipe 300 through the conduit 1200 into the upper cavity of the inlet pipe 200.

[0028] When the circulated groundwater needs to be discharged from the discharge pipe 1520 into the external waste heat recovery unit, the first column 900 moves upward, as... Figure 8 As shown, the top of the rod 1600 will first abut against the second cover plate 1710. As the first column 900 continues to move upward, the second cover plate 1710 will completely seal the lower surface of the second through hole 1510. Simultaneously, as... Figure 12 As shown, the groove 1720 will move to communicate with the discharge pipe 1520. When the first column 900 moves upward, the rod 1600 is squeezed, causing the rod 1600 to move downward relative to the first column 900, as... Figure 8As shown, the rod 1600 drives the first cover plate 1610 away from the bottom of the first column 900, exposing the first through hole 910. At this time, the circulated groundwater flows from the lower cavity of the outlet pipe 300, through the first through hole 910, and then from the groove 1720 into the discharge pipe 1520. This setting allows the circulated groundwater to be discharged into the external waste heat recovery unit without wasting the waste heat of the groundwater. It should be noted that the second through hole 1510 must be sealed first in the order of this application before the first through hole 910, the groove 1720, and the discharge pipe 1520 can be connected. To prevent air from entering the external waste heat recovery unit pipe through the second through hole 1510, the first through hole 910, the groove 1720, and the discharge pipe 1520, the oxygen in the air will dissolve in the water and react with the metal components in the system (such as pipes, manifolds, valves, heat exchangers, pump impellers, etc.) to cause oxidation, resulting in rust and corrosion.

[0029] To ensure that the preheated cavities, separated by several partitions of 500mm, can maintain connectivity of domestic water supply when water usage is high, such as... Figure 2 and Figure 3 As shown, a connecting pipe is inserted between the outer surfaces of the partitions 500 at their middle positions. Multiple solenoid valves 600 are installed on the outer surface of the connecting pipe near its outer surface. These solenoid valves 600 are respectively located on the upper surface of the partitions 500. When the heat exchange tube 400 participating in the first cycle changes, the solenoid valve 600 is controlled by an electrical signal and opens the solenoid valve 600 at the bottom of the cavity where the current heat exchange tube 400 is located. When the solenoid valve 600 is open, it connects adjacent cavities, allowing the domestic water inside to flow. To ensure the water inside the cavity reaches the operating temperature, such as… Figure 13 As shown, heat exchangers are provided on the lower surfaces of the several partitions 500. The heat exchangers circulate a heating medium through a heat pump, thereby providing additional heating to the water inside the cavity.

[0030] In order to adjust the number of heat exchange tubes 400 that directly participate in the groundwater circulation in real time according to the amount of water used, such as Figure 1 As shown, a water outlet pipe 1300 is fixedly installed at the bottom of the water tank 100. A flow sensor 1400 is fixedly installed at the outlet end of the water outlet pipe 1300. The flow sensor 1400 senses the water flow rate and then sends an electrical signal to the controller. The controller then controls the drive motor 840 to move, thereby controlling the position of the first column 900 and the second column 1000. In order to replenish the water used inside the cavity in time, multiple water inlet valves 110 are provided on the outer surface of the water tank 100. The multiple water inlet valves 110 are respectively connected to multiple cavities inside the water tank 100, and water is replenished to the multiple cavities inside the water tank 100 through the water inlet valves 110.

[0031] In this solution, the electrical components are controlled by their associated peripheral controllers. The control circuit can be easily programmed by those skilled in the art and is common knowledge in the field. It is used without modification. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A water tank for a heat pump water heater, characterized in that, include: Water tank body (100), used for storing water; Several partitions (500) are disposed inside the water tank (100) to divide the interior of the water tank (100) into multiple cavities; Several heat exchange tubes (400) are respectively installed inside multiple cavities for preheating the water inside the cavities; An inlet pipe (200) is installed on the outer surface of the water tank (100) for the entry of groundwater. The inlet ends of the plurality of heat exchange tubes (400) penetrate the outer surface of the water tank (100) and are connected to the inlet pipe (200). The outlet pipe (300) is located on the outer surface of the water tank (100) and is used for the discharge of groundwater. The outlet ends of the plurality of heat exchange pipes (400) penetrate the outer surface of the water tank (100) and are connected to the outlet pipe (300). The inlet pipe (200) is connected to the outlet pipe (300) through the heat exchange pipe (400). The first column (900) and the second column (1000) are located inside the outlet pipe (300) and inside the inlet pipe (200). The first column (900) and the second column (1000) are configured such that when they move in the same direction along the central axis of the water tank (100), at least one of the heat exchange tubes (400) can preheat the domestic water inside the water tank (100).

2. The water tank of the heat pump water heater according to claim 1, characterized in that, Sliding sleeves (700) are slidably installed on the outer surfaces of the inlet pipe (200) and the outlet pipe (300). Magnetic plates (1100) are fixedly installed on the outer surfaces of the first column (900) and the second column (1000) near the sliding sleeves (700). Electromagnetic plates (710) are fixedly installed on the inner wall of the sliding sleeves (700) near the magnetic plates (1100). There is a magnetic attraction between the electromagnetic plates (710) and the magnetic plates (1100). The sliding sleeves (700) are configured to move along the central axis of the inlet pipe (200) and the outlet pipe (300) when they move, so that the first column (900) and the second column (1000) can move in the same direction along the central axis of the water tank (100) through the magnetic attraction between the electromagnetic plates (710) and the magnetic plates (1100).

3. The water tank of the heat pump water heater according to claim 1, characterized in that, The outer surfaces of the inlet pipe (200) and the outlet pipe (300) are provided with a drive unit (800) for moving the sliding sleeve (700), and the drive unit (800) includes: Mounting plate (810), which is fixedly installed between two sliding sleeves (700); Gear (820), which is rotatably mounted on the outer surface of the mounting plate (810) near the water tank body (100); A rack (830) is fixedly installed on the outer surface of the water tank body (100), and the gear (820) meshes with the rack (830); A drive motor (840) is fixedly installed on the outer surface of the mounting plate (810) away from the water tank body (100). The output end of the drive motor (840) passes through the outer surface of the mounting plate (810) and is fixedly connected to the rotation center of the gear (820).

4. The water tank of the heat pump water heater according to claim 1, characterized in that, The top end of the inlet pipe (200) is fixedly connected to a conduit (1200), and the other end of the conduit (1200) is fixedly connected to the bottom end of the outlet pipe (300). The inlet pipe (200) is connected to the outlet pipe (300) through the conduit (1200).

5. The water tank of the heat pump water heater according to claim 2, characterized in that, The top of the first column (900) is provided with a first through hole (910). A rod (1600) is slidably inserted inside the first column (900). The bottom end of the rod (1600) is fixedly installed with a first cover plate (1610) through the bottom end of the first column (900). The top end of the rod (1600) is fitted with a spring (1620) through the top end of the first column (900). One end of the spring (1620) is fixedly connected to the top end of the first column (900), and the other end of the spring (1620) is fixedly connected to the top end of the rod (1600). The first cover plate (1610) is set to completely cover the first through hole (910). The outer dimensions of the first cover plate (1610) are smaller than the outer dimensions of the first column (900).

6. The water tank of the heat pump water heater according to claim 5, characterized in that, A third column (1500) is fixedly installed on the inner wall near the top of the outlet pipe (300). The top of the third column (1500) has multiple second through holes (1510). A discharge pipe (1520) is fixedly connected to the outer surface of one side of the third column (1500). The other end of the discharge pipe (1520) passes through the outer surface of the outlet pipe (300).

7. The water tank of the heat pump water heater according to claim 6, characterized in that, A column (1700) is slidably inserted inside the third column (1500). The column (1700) is polygonal in shape. A second cover plate (1710) is fixedly installed at the bottom end of the column (1700) through the bottom end of the third column (1500). The second cover plate (1710) completely covers multiple second through holes (1510). The outer dimensions of the second cover plate (1710) are smaller than the outer dimensions of the third column (1500).

8. The water tank of the heat pump water heater according to claim 7, characterized in that, A baffle plate (1730) is fixedly installed at the top of the column (1700) through the top of the third column (1500). A groove (1720) is opened on the outer surface of the column (1700) near the bottom end. The groove (1720) is connected to the discharge pipe (1520). The first through hole (910), the discharge pipe (1520) and the groove (1720) are arranged opposite to the second through hole (1510).

9. The water tank of the heat pump water heater according to claim 1, characterized in that, A connecting pipe is inserted between the outer surfaces of the middle positions of the several partitions (500), and a plurality of solenoid valves (600) are provided on the outer surface of the connecting pipe. The solenoid valves (600) are respectively provided on the upper surface of the several partitions (500), and heat exchangers are provided on the lower surface of the several partitions (500).

10. The water tank of the heat pump water heater according to claim 1, characterized in that, The outer surface of the water tank (100) is provided with a plurality of water inlet valves (110), which are respectively connected to a plurality of cavities inside the water tank (100). A water outlet pipe (1300) is fixedly installed at the bottom of the water tank (100), and a flow sensor (1400) is fixedly installed at the outlet end of the water outlet pipe (1300).

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