Water tank for heat pump water heater

Abstract

The present application relates to the technical field of water tank, and discloses a water tank for heat pump water heater, which comprises a water tank body for storing domestic water, a plurality of partitions arranged in the interior of the water tank body for separating the interior of the water tank body into a plurality of cavities, a plurality of heat exchange pipes respectively arranged in the interiors of the plurality of cavities for preheating domestic water in the cavities, and an inlet pipe arranged on the outer surface of the water tank body for the entry of underground water, wherein the water inlet ends of the plurality of heat exchange pipes are connected with the inlet pipe by penetrating through the outer surface of the water tank body. The present application can preheat the domestic water stored in the interior of the water tank body in winter, reduce the energy consumption of the compressor, save energy, avoid long-time high-pressure operation of the compressor, and ensure the service life of the compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water tanks, in particular to a water tank for a heat pump water heater. BACKGROUND

[0002] The water source heat pump water heater is a device for efficiently producing hot water for daily use or industrial use by using the solar energy stored in the earth water body (such as underground water, river, lake, sea water or waste water) as a heat source / sink through heat pump technology.

[0003] The existing water tank for a heat pump water heater, when in use, circulates the high-pressure refrigerant gas with temperature rising after compression of the compressor from the heat exchange pipe, thereby heating the water in the water tank. In winter, the water temperature in the water tank is relatively low, and at this time, the compressor needs a larger compression ratio to make the water in the water tank reach the required temperature. The high compression ratio causes the exhaust temperature of the compressor to abnormally rise, and the compressor runs for a long time under high temperature working condition, which causes the winding to overheat and the mechanical wear to intensify, thereby greatly reducing the service life of the compressor. SUMMARY

[0004] The purpose of the present application is to solve the problems existing in the prior art, and a water tank for a heat pump water heater is provided.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] The water tank for a heat pump water heater comprises:

[0007] A water tank body for storing water for daily use;

[0008] A plurality of partitions arranged in the interior of the water tank body for separating the interior of the water tank body into a plurality of cavities;

[0009] A plurality of heat exchange pipes arranged in the interior of the plurality of cavities for preheating the water for daily use in the cavities;

[0010] An inlet pipe arranged on the outer surface of the water tank body for the entry of underground water, and the water inlet ends of the plurality of heat exchange pipes are connected with the inlet pipe through the outer surface of the water tank body;

[0011] An outlet pipe arranged on the outer surface of the water tank body for the outlet of underground water, and the water outlet ends of the plurality of heat exchange pipes are connected with the outlet pipe through the outer surface of the water tank body, and the inlet pipe is in communication with the outlet pipe through the heat exchange pipe;

[0012] A first column and a second column, the first column is arranged in the interior of the outlet pipe, the second column is arranged in the interior of the inlet pipe, and when the first column and the second column move in the same direction along the central axis of the water tank body, at least one of the plurality of heat exchange pipes can preheat the water for daily use in the interior of the water tank body.

[0013] As a further scheme of the present application, the outer surface of the inlet pipe and the outlet pipe is slidingly installed with a sliding sleeve, the outer surface of the first column and the second column close to the side of the sliding sleeve is fixedly installed with a magnetic sheet, the inner wall of the sliding sleeve close to the magnetic sheet is fixedly installed with an electromagnetic sheet, the electromagnetic sheet and the magnetic sheet have magnetic attraction, the sliding sleeve is arranged to be able to drive the first column and the second column to move in the same direction along the central axis of the water tank body by the magnetic attraction between the electromagnetic sheet and the magnetic sheet when the sliding sleeve moves along the central axis of the inlet pipe and the outlet pipe.

[0014] As a further scheme of the present application, the outer surface of the inlet pipe and the outlet pipe is provided with a driving unit for driving the sliding sleeve to move, the driving unit comprises:

[0015] a mounting plate fixedly installed between the two sliding sleeves;

[0016] a gear rotatably installed on the outer surface of the mounting plate close to the water tank body;

[0017] a rack fixedly installed on the outer surface of the water tank body, the gear is engaged with the rack;

[0018] a driving motor fixedly installed on the outer surface of the mounting plate away from the water tank body, the output end of the driving motor penetrates the outer surface of the mounting plate and is fixedly connected with the rotation center of the gear.

[0019] As a further scheme of the present application, the top end of the inlet pipe is fixedly connected with a guide pipe, the other end of the guide pipe is fixedly connected with the bottom end of the outlet pipe, the inlet pipe is communicated with the outlet pipe through the guide pipe.

[0020] As a further scheme of the present application, the top end of the first column is penetrated with a first through hole, a rod body is slidingly inserted into the first column, a first cover plate is fixedly installed on the bottom end of the rod body penetrating the bottom end of the first column, a spring is sleeved on the top end of the rod body penetrating the top end of the first column, one end of the spring is fixedly connected with the top end of the first column, the other end of the spring is fixedly connected with the top end of the rod body, the first cover plate completely covers the first through hole, the outer dimension of the first cover plate is smaller than the outer dimension of the first column.

[0021] As a further scheme of the present application, the inner wall close to the top end of the outlet pipe is fixedly installed with a third column, a plurality of second through holes are penetrated on the top end of the third column, a discharge pipe is fixedly connected on the outer surface of one side of the third column, the other end of the discharge pipe penetrates the outer surface of the outlet pipe.

[0022] As a further scheme of the present application, the inside of the third column body is slidably inserted with a column body, the column body is polygonal in shape, a second cover plate is fixedly installed at the bottom end of the column body and penetrates through the bottom end of the third column body, the second cover plate completely covers the plurality of second through holes, and the size of the second cover plate is smaller than the size of the third column body.

[0023] As a further scheme of the present application, the top end of the column body is fixedly installed with a baffle and penetrates through the top end of the third column body, a groove is formed on the outer surface of the column body close to the bottom end side, the groove is in communication with the discharge pipe, and the first through hole, the discharge pipe and the groove are oppositely arranged with the second through hole.

[0024] As a further scheme of the present application, a communication pipe is inserted between the outer surfaces of the middle positions of the plurality of partition plates, a plurality of electromagnetic valves are arranged on the outer surface close to the communication pipe, the electromagnetic valves are respectively arranged on the upper surfaces of the plurality of partition plates, and the lower surfaces of the plurality of partition plates are respectively provided with heat exchangers.

[0025] As a further scheme of the present application, a plurality of water inlet valves are arranged on the outer surface of the water tank body, the plurality of water inlet valves are respectively in communication with a plurality of cavities in the water tank body, a water outlet pipe is fixedly installed at the bottom of the water tank body, and a flow sensor is fixedly installed at the water outlet end of the water outlet pipe.

[0026] The present application is provided with a plurality of heat exchange pipes, so that the domestic water stored in the water tank body can be preheated in winter, the energy consumption of the compressor is reduced, energy is saved, long-term high-pressure operation of the compressor is avoided, and the service life of the compressor is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The present application is provided with a heat pump water heater water tank overall structure diagram;

[0028] Figure 2 The present application is provided with a heat pump water heater water tank internal structure diagram;

[0029] Figure 3 The present application is provided with a heat pump water heater water tank partition plate diagram;

[0030] Figure 4 The present application is provided with a heat pump water heater water tank driving unit diagram;

[0031] Figure 5 The present application is provided with a heat pump water heater water tank single pipe heating state diagram;

[0032] Figure 6 The present application is provided with a heat pump water heater water tank multi-pipe heating state diagram;

[0033] Figure 7 The schematic diagram of the electromagnetic sheet of the water tank for the heat pump water heater according to the present application;

[0034] Figure 8 The schematic diagram of the first column body of the water tank for the heat pump water heater according to the present application; Figure 6 The schematic diagram of the local enlargement at A in the middle of the water tank for the heat pump water heater according to the present application;

[0035] Figure 9 The schematic diagram of the third column body of the water tank for the heat pump water heater according to the present application;

[0036] Figure 10 The schematic diagram of the third column body of the water tank for the heat pump water heater according to the present application;

[0037] Figure 11 The schematic diagram of the first column body of the water tank for the heat pump water heater according to the present application;

[0038] Figure 12 The schematic diagram of the third column body of the water tank for the heat pump water heater according to the present application;

[0039] Figure 13 The schematic diagram of the partition plate of the water tank for the heat pump water heater according to the present application.

[0040] In the figure:

[0041] 100, water tank body; 110, water inlet valve;

[0042] 200, inlet pipe; 300, outlet pipe; 400, heat exchange pipe; 500, partition plate; 600, electromagnetic valve;

[0043] 700, sliding sleeve; 710, electromagnetic sheet;

[0044] 800, driving unit; 810, mounting plate; 820, gear; 830, rack; 840, driving motor;

[0045] 900, first column body; 910, first through hole;

[0046] 1000, second column body; 1100, magnetic sheet; 1200, guide pipe; 1300, water outlet pipe; 1400, flow sensor;

[0047] 1500, third column body; 1510, second through hole; 1520, discharge pipe;

[0048] 1600, rod body; 1610, first cover plate; 1620, spring;

[0049] 1700, column body; 1710, second cover plate; 1720, groove; 1730, blocking sheet. DETAILED DESCRIPTION

[0050] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in conjunction with specific embodiments.

[0051] In order to make the extracted underground water can preheat the water in the water tank, as Figure 1 and Figure 2 shown, the present application proposes a water tank for heat pump water heater, comprising a water tank body 100, a plurality of partitions 500, a plurality of heat exchange pipes 400, an inlet pipe 200, an outlet pipe 300, a first column 900 and a second column 1000. The inside of the water tank body 100 stores domestic water, by fixing a plurality of partitions 500 in the inside of the water tank body 100, for separating the inside of the water tank body 100 into a plurality of cavities, and then fixing a plurality of heat exchange pipes 400 in the inside of the plurality of cavities, for preheating the domestic water in the cavities. In order to make the underground water enter the inside of the plurality of heat exchange pipes 400, as Figure 3 and Figure 4 shown, the inlet pipe 200 is fixedly installed on the outer surface of the water tank body 100, the water inlet end of the inlet pipe 200 is communicated with the external water pump through a hose, so that the underground water extracted by the water pump enters the inside of the inlet pipe 200, since the water inlet end of the plurality of heat exchange pipes 400 penetrates the outer surface of the water tank body 100 and is connected with the inlet pipe 200, the underground water enters the inside of the plurality of heat exchange pipes 400 through the inlet pipe 200, and since the outlet pipe 300 is fixedly installed on the outer surface of the water tank body 100, the water outlet end of the plurality of heat exchange pipes 400 penetrates the outer surface of the water tank body 100 and is connected with the outlet pipe 300, the inlet pipe 200 is communicated with the outlet pipe 300 through the heat exchange pipes 400, the underground water extracted by the water pump will flow into the inside of the outlet pipe 300 after circulating in the heat exchange pipes 400, and then be discharged from the water outlet end of the outlet pipe 300, through the device, the domestic water stored in the inside of the water tank body 100 can be preheated in winter, reducing the energy consumption of the compressor and saving energy, at the same time, avoiding long-time high-pressure operation of the compressor, ensuring the service life of the compressor.

[0052] Since the use of domestic water sometimes increases and sometimes decreases, a large amount of underground water is needed to preheat the domestic water in the entire water tank body 100, causing the water pump to need high-pressure operation, in order to preheat the domestic water in the inside of the water tank body 100 locally according to the water consumption, reducing the working pressure of the water pump, as Figure 5 and Figure 6As shown, the first column 900 is arranged inside the outlet pipe 300 and is slidingly mounted with the inner wall of the outlet pipe 300 and is in close contact with the inner wall of the outlet pipe 300, and the second column 1000 is arranged inside the inlet pipe 200 and is slidingly mounted with the inner wall of the inlet pipe 200 and is in close 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 body 100, that is, when the height position of the first column 900 and the second column 1000 changes, at least one of the heat exchange pipes 400 can preheat the domestic water in the water tank body 100, through the arrangement, the device can select the heat exchange pipe 400 that needs to directly circulate underground water according to the demand, that is, the number of heat exchange pipes 400 participating in the first circulation of underground water, so as to heat the domestic water in one or more cavities of the water tank body 100, adjust the amount of domestic water that needs to be preheated in real time, and the pumping capacity of the water pump can be adjusted according to the number of heat exchange pipes 400, so as to avoid long-time high-pressure work of the water pump, save electricity and energy consumption.

[0053] After the underground water preheats the domestic water in the cavity of the water tank body 100 through the heat exchange pipe 400, there is often still some residual heat, in order to avoid this waste of heat, for example Figure 6 As shown, the top end of the inlet pipe 200 is fixedly connected with a conduit 1200, the other end of the conduit 1200 is fixedly connected with the bottom end of the outlet pipe 300, and the inlet pipe 200 is connected in communication with the outlet pipe 300 through the conduit 1200, as shown in Figure 5As shown, when there are still at least one of the heat exchange pipes 400 not participating in the first circulation of the underground water, because the first column 900 and the second column 1000 respectively separate the interiors of the outlet pipe 300 and the inlet pipe 200 into upper and lower cavities, the underground water entering from the inlet pipe 200 will first circulate once through the heat exchange pipe 400 from the lower cavity of the inlet pipe 200, and then be discharged from the other end of the heat exchange pipe 400 to the interior of the lower cavity of the outlet pipe 300. Because of the separation of the first column 900, the circulated underground water flows into the interior of the upper cavity of the inlet pipe 200 through the guide pipe 1200, and then flows through the interiors of other heat exchange pipes 400, and finally flows into the interior of the upper cavity of the outlet pipe 300, and is discharged from the outlet of the upper cavity of the outlet pipe 300 to the interior of the water storage tank for subsequent use. Through the above arrangement, the underground water that has circulated once through the heat exchange pipe 400 can enter the subsequent heat exchange pipe 400 again to preheat the domestic water in the cavity of the water tank body 100 (i.e., through the final circulation of the underground water, the remaining heat exchange pipes 400 continue to preheat the domestic water in the cavity of the water tank body 100), so that the waste heat of the underground water can be utilized to the maximum extent. It should be noted that because the interiors of the outlet pipe 300 and the inlet pipe 200 are separated by the first column 900 and the second column 1000, the just extracted underground water will first circulate in the heat exchange pipe 400 of the water tank body 100 cavity that needs to be heated, and then circulate in the remaining heat exchange pipes 400, which will not affect the preheating of the domestic water by the normal heat exchange pipes 400.

[0054] In order to be able to drive the first column 900 and the second column 1000 to move in the interiors of the outlet pipe 300 and the inlet pipe 200 and adjust the height positions of the two, as shown in the drawings, Figure 4 As shown, the outer surfaces of the inlet pipe 200 and the outlet pipe 300 are slidingly installed with a sliding sleeve 700, as shown in the drawings, Figure 5 As shown, the outer surfaces of the first column 900 and the second column 1000 close to the sliding sleeve 700 are fixedly installed with a magnetic sheet 1100, as shown in the drawings, Figure 7 As shown, the inner wall of the sliding sleeve 700 close to the magnetic sheet 1100 is fixedly installed with an electromagnetic sheet 710, and the electromagnetic sheet 710 and the magnetic sheet 1100 have a magnetic attraction force. By moving the sliding sleeve 700 along the central axis direction of the inlet pipe 200 and the outlet pipe 300, the first column 900 and the second column 1000 can be driven to move in the same direction along the central axis direction of the water tank body 100 by the magnetic attraction force between the electromagnetic sheet 710 and the magnetic sheet 1100, so as to adjust the height positions of the first column 900 and the second column 1000. Therefore, the user can adjust the number of heat exchange pipes 400 participating in the first circulation of the underground water according to the needs. It should be noted that the magnetic attraction force between the electromagnetic sheet 710 and the magnetic sheet 1100 is strong and will not be separated due to water pressure.

[0055] In order to drive the sliding sleeve 700 to move along the central axis direction of the inlet pipe 200 and the outlet pipe 300, as shown in Figure 3 and Figure 7 , the outer surface of the inlet pipe 200 and the outlet pipe 300 is provided with a driving unit 800 for driving the sliding sleeve 700 to move, and the driving unit 800 comprises a mounting plate 810, a gear 820, a rack 830 and a driving 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 close to the water tank body 100, the rack 830 is fixedly installed on the outer surface of the water tank body 100, and the driving 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 driving motor 840 penetrates the outer surface of the mounting plate 810 and is fixedly connected with the rotation center of the gear 820. The output end of the driving motor 840 drives the gear 820 to rotate, and the gear 820 drives the mounting plate 810 to move up and down along the central axis direction of the inlet pipe 200 and the outlet pipe 300 to adjust the height position.

[0056] As shown in Figure 6 , when all the heat exchange pipes 400 are used for direct circulation of underground water, the underground water after circulation does not have subsequent heat exchange pipes 400 for waste heat recovery. In order to avoid waste of the waste heat of the underground water, as shown in Figure 6 and Figure 8 , the inner wall of the outlet pipe 300 close to the top end is fixedly provided with a third column 1500, and the outer surface of one side of the third column 1500 is fixedly connected with a discharge pipe 1520. The other end of the discharge pipe 1520 penetrates the outer surface of the outlet pipe 300 and is connected in communication with an external waste heat recovery unit (which can be a floor heating pipe). In order to enable the discharge pipe 1520 to be connected in communication with the external waste heat recovery unit, as shown in Figure 10 and Figure 12 , a column 1700 is slidably inserted into the inside of the third column 1500. The outer surface of the side close to the bottom end of the column 1700 is provided with a groove 1720. When the column 1700 slides upward along the axial direction in the inside of the third column 1500, the groove 1720 is connected in communication with the discharge pipe 1520. At this time, the underground water after circulation enters the inside of the external waste heat recovery unit through the groove 1720 and the discharge pipe 1520. Specifically, in order to limit the column 1700 to only slide along the axial direction and not to rotate, as shown in Figure 12 , the column 1700 is polygonal in shape, so that the column 1700 cannot rotate.

[0057] In order to make the underground water after the lower cavity circulation of the outlet pipe 300 flow into the upper cavity of the outlet pipe 300, the top end of the first column 900 is provided with a first through hole 910, and the underground water after the lower cavity circulation 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.

[0058] When part of the heat exchange pipe 400 is not used for direct circulation of underground water, the remaining heat exchange pipe 400 can normally collect the residual heat of the circulated underground water, such as Figure 10 As shown, the top end of the third column 1500 is provided with a plurality of second through holes 1510, and the circulated underground water enters the upper cavity of the outlet pipe 300 and is discharged into the water storage tank from the second through hole 1510.

[0059] In order to make the circulated underground water be able to switch discharge from the discharge pipe 1520 and the plurality of second through holes 1510, as shown Figure 9 、 Figure 10 、 Figure 11 and Figure 12 As shown, the inside of the first column 900 is slidably inserted with a rod body 1600, the bottom end of the rod body 1600 is fixedly installed with a first cover plate 1610 penetrating the bottom end of the first column 900, the top end of the rod body 1600 is sleeved with a spring 1620 penetrating the top end of the first column 900, one end of the spring 1620 is fixedly connected with the top end of the first column 900, the other end of the spring 1620 is fixedly connected with the top end of the rod body 1600, the first cover plate 1610 completely covers the first through hole 910, the outer dimension of the first cover plate 1610 is smaller than the outer dimension of the first column 900, the bottom end of the column 1700 is fixedly installed with a second cover plate 1710 penetrating the bottom end of the third column 1500, the second cover plate 1710 completely covers the plurality of second through holes 1510, the outer dimension of the second cover plate 1710 is smaller than the outer dimension of the third column 1500, the top end of the column 1700 is fixedly installed with a baffle 1730 penetrating 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, and do not interfere with each other, so as to ensure that the circulated underground water can be switched and discharged from the discharge pipe 1520 and the plurality of second through holes 1510. When at least one heat exchange pipe 400 can perform the final circulation of underground water to recover the residual heat of underground water, under the elastic force of the spring 1620, as shown Figure 9 The rod body 1600 drives the first cover plate 1610 to seal the first through hole 910, at this time, the circulated underground water must flow into the upper cavity of the inlet pipe 200 from the lower cavity of the outlet pipe 300 through the conduit 1200.

[0060] 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 8 As 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.

[0061] 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.

[0062] 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 1As shown, the bottom of the water tank body 100 is fixedly provided with a water outlet pipe 1300, and the water outlet end of the water outlet pipe 1300 is fixedly provided with a flow sensor 1400. The flow sensor 1400 senses the water flow, and then sends an electric signal to the controller, and then controls the driving motor 840 to move, so as to control the positions of the first column body 900 and the second column body 1000. In order to supplement the water used in the cavity in time, the outer surface of the water tank body 100 is provided with a plurality of water inlet valves 110, which are respectively connected with a plurality of cavities in the water tank body 100, and the water in the cavities is supplemented through the water inlet valves 110.

[0063] The control mode of the electrical element in the scheme is controlled by the peripheral controller matched with the electrical element, and the control circuit can be realized by simple programming of the person skilled in the art, and belongs to the public knowledge in the art. The control mode and the circuit connection are only used and not improved, and the present application is mainly used to protect the mechanical device. Therefore, the control mode and the circuit connection will not be explained in detail.

[0064] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application.

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). A first column (900) and a second column (1000) are provided, the first column (900) being disposed inside the outlet pipe (300) and the second column (1000) being disposed 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 plurality of heat exchange tubes (400) can preheat the domestic water inside the water tank (100). 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).

2. 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).

3. 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).

4. The water tank of the heat pump water heater according to claim 1, 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).

5. The water tank of the heat pump water heater according to claim 4, 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).

6. The water tank of the heat pump water heater according to claim 5, 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).

7. The water tank of the heat pump water heater according to claim 6, 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).

8. 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).

9. 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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