A multi-stage sectional heat pump water heater heat exchange structure

Abstract

This invention discloses a multi-stage segmented heat exchange structure for a heat pump water heater, belonging to the field of heat exchange technology. The structure includes a heat exchange chamber, an inlet pipe, an outlet pipe, a heater, a circulation assembly, multiple heat-absorbing components, and a multi-stage flow guiding structure. The circulation assembly pumps high-temperature water from the bottom of the chamber to the top, achieving uniform medium temperature. The heat-absorbing components are arranged in segments along the pipes. This invention achieves efficient heat conduction through a tightly fitted, elastically pre-tightened heat-conducting plate against the outer wall of the pipe. The multi-stage flow guiding structure consists of perforated inclined plates arranged in a staggered pattern within the pipe, extending the liquid residence time. Through the synergistic effect of external temperature uniformity, segmented enhanced heat transfer, and internal flow guiding delay, this invention significantly improves liquid vaporization efficiency and heat exchange uniformity. It features a compact structure, high heat exchange efficiency, and good safety, and is suitable for heat pump water heaters and other phase-change heat exchange equipment.

Description

Technical Field

[0001] This invention relates to the field of heat exchange heater technology, specifically a multi-stage segmented heat pump water heater heat exchange structure. Background Technology

[0002] As a highly efficient and energy-saving hot water supply device, a heat pump water heater works by absorbing low-grade heat energy from the air through a heat pump circulation system. This heat energy is then transferred to the water in the tank via a compressor, thus heating the water. In this process, the performance of the heat exchanger directly determines the coefficient of performance (COP) and user experience of the entire heat pump system. Traditional heat pump water heaters typically use a single coil-type or plate-type heat exchanger, whose heat exchange area and efficiency are limited by the structure.

[0003] In existing technologies, heat exchange structures for liquid heating processes, especially in scenarios requiring phase change heat transfer of liquid refrigerants or other working media, generally suffer from the following technical problems: First, the residence time of the liquid to be heated in the heat exchange pipe is short, and the liquid flows out before fully absorbing heat, resulting in incomplete heating and affecting system performance; Second, the heat exchange medium (such as water) in the heat exchange chamber exhibits significant temperature stratification during the heating process, i.e., the upper part of the water is hotter than the lower part, leading to uneven heating in different sections of the heat exchange pipe, resulting in local overheating or insufficient local heat transfer; Third, the thermal contact between the heat exchange pipe and the heating medium is poor. Traditional heat exchange structures are mostly pipe immersion type, with high thermal resistance and heat transfer efficiency that needs improvement; Fourth, existing heat exchange structures lack effective management of pressure fluctuations within the pipe, which can easily lead to safety hazards or reduce heat exchange stability due to sudden pressure increases.

[0004] To address these issues, some existing technologies attempt to improve heat exchange efficiency by increasing the length of heat exchange tubes, expanding the heat exchange area, or increasing the flow rate. However, these methods often lead to increased equipment size, higher costs, or increased energy consumption. Therefore, there is an urgent need for a novel heat exchange structure that can significantly improve heat exchange efficiency, ensure heat exchange uniformity, and enhance system stability without significantly increasing equipment size and cost. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage segmented heat pump water heater heat exchange structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage segmented heat pump water heater heat exchange structure, comprising:

[0007] A heat exchange box, wherein a first heat exchange chamber for containing a heat exchange medium is formed inside the heat exchange box;

[0008] At least one liquid inlet pipe is disposed in the first heat exchange chamber for conveying the liquid to be heated;

[0009] The water outlet pipe is connected to the outlet end of the liquid inlet pipe and is used to discharge the heated gas.

[0010] A heater, disposed inside the heat exchange box, is used to heat the heat exchange medium;

[0011] The circulation component has its inlet connected to the lower region of the heat exchange box and its outlet connected to the upper region of the heat exchange box. It is used to pump the higher temperature medium at the bottom of the heat exchange box to the top to achieve uniformity of the medium temperature.

[0012] Multiple heat-absorbing components are arranged in sections in the first heat exchange chamber along the extension direction of the liquid inlet pipe. Each heat-absorbing component abuts against the outer wall of the liquid inlet pipe and is used to efficiently transfer the heat of the heat exchange medium to the liquid inlet pipe.

[0013] A multi-stage flow guiding structure is provided inside the liquid inlet pipe to extend the flow path and residence time of the liquid to be heated within the liquid inlet pipe.

[0014] As a further embodiment of the present invention, the multi-stage flow guiding structure includes a plurality of inclined plates arranged alternately along the axial direction of the liquid inlet pipe, each of the inclined plates being fixedly connected to the inner wall of the liquid inlet pipe, and each of the inclined plates having a plurality of through holes.

[0015] As a further embodiment of the present invention, the circulation assembly includes a pumping pipe, a water pump, and a draining pipe; one end of the pumping pipe is connected to the bottom of the heat exchange box, and the other end is connected to the inlet of the water pump; one end of the draining pipe is connected to the outlet of the water pump, and the other end is connected to the top of the heat exchange box.

[0016] As a further embodiment of the present invention, the heat-absorbing component includes:

[0017] A pair of heat-conducting plates are attached to the outer walls of the liquid inlet pipe from opposite sides;

[0018] A connecting rod, one end of which is fixedly connected to the outer side of the heat-conducting plate;

[0019] A connecting frame is fixedly connected to the other end of the connecting rod;

[0020] At least one sliding rod is fixedly installed on the inner wall of the heat exchange box and slides in cooperation with the heat conduction plate;

[0021] An elastic element is sleeved on the slide rod, with one end abutting against the heat-conducting plate and the other end abutting against the inner wall of the heat exchange box, for providing a pre-tightening force to make the heat-conducting plate tightly adhere to the liquid inlet pipe.

[0022] As a further embodiment of the present invention, the side of the heat-conducting plate facing the liquid inlet pipe is an arc-shaped curved surface that matches the outer wall of the liquid inlet pipe, and the heat-conducting plate is made of copper or aluminum alloy.

[0023] As a further embodiment of the present invention, the liquid inlet pipe and the water outlet pipe are connected by a pressure relief valve. The pressure relief valve is used to automatically open when the pressure in the liquid inlet pipe exceeds a preset threshold, so that the heated gas enters the water outlet pipe.

[0024] As a further embodiment of the present invention, a cover plate is movably connected to the top of the heat exchange box, and an inlet pipe for injecting heat exchange medium is provided on the cover plate, and an outlet pipe for discharging heat exchange medium is provided on the lower part of the side wall of the heat exchange box.

[0025] As a further embodiment of the present invention, the heater is an electric heating tube, which is arranged in a serpentine or spiral shape at the bottom of the heat exchange box.

[0026] As a further embodiment of the present invention, the number of heat-absorbing components is three to five, which are distributed at equal intervals along the axial direction of the liquid inlet pipe to form a segmented enhanced heat exchange structure.

[0027] As a further embodiment of the present invention, the included angle between the inclined plate and the axis of the liquid inlet pipe is 30° to 60°, the diameter of the through hole is 2mm to 5mm, and the projections of two adjacent inclined plates on the axial direction of the liquid inlet pipe at least partially overlap.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. When using this invention, by setting a multi-stage inclined plate flow guiding structure inside the liquid inlet pipe, the flow path of the liquid to be heated is effectively extended, and the residence time is increased by 20% to 40%, so that the liquid can absorb external heat more fully, the heating rate is significantly improved, and the possibility of unheated liquid entering the downstream system is reduced.

[0030] 2. In use, this invention introduces a circulation component driven by a water pump, forcibly transporting the relatively cooler medium from the bottom of the heat exchanger to the top, where it mixes with the higher-temperature medium, effectively solving the problem of hot water stratification. Experiments show that with the circulation component operating, the maximum vertical temperature difference within the heat exchanger can be reduced from the original 10-15℃ to less than 2℃, ensuring a uniform heat supply along the entire length of the inlet pipe and avoiding localized overheating or insufficient heat exchange.

[0031] 3. In use, this invention employs a segmented, elastically pre-tightened heat-conducting plate structure, replacing the traditional air gap or simple bonding method. Under the action of the spring, the heat-conducting plate maintains a tight arc-shaped contact with the outer wall of the liquid inlet pipe, reducing contact thermal resistance by more than 50%. Simultaneously, the high thermal conductivity of the heat-conducting plate itself allows heat to be rapidly transferred from the medium to the pipe wall, effectively shortening the heat exchange response time. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a multi-stage segmented heat pump water heater heat exchange structure.

[0033] Figure 2 This is a schematic diagram of the cross-sectional structure of a multi-stage segmented heat pump water heater.

[0034] Figure 3 A multi-stage segmented heat pump water heater heat exchange structure Figure 2 A magnified structural diagram of point A in the middle.

[0035] Figure 4 This is a schematic diagram of the cross-sectional structure of the liquid inlet pipe in a multi-stage segmented heat pump water heater heat exchange structure.

[0036] Figure 5 A multi-stage segmented heat pump water heater heat exchange structure Figure 4 A magnified structural diagram at point B in the middle.

[0037] In the diagram: 1. Heat exchanger body; 101. Cover plate; 102. Inlet pipe; 103. Outlet pipe;

[0038] 2. Liquid inlet pipe;

[0039] 3. Water outlet pipe;

[0040] 4. Pressure relief valve;

[0041] 5. Heater;

[0042] 6. Circulation assembly; 601. Pumping pipe; 602. Water pump; 603. Drainage pipe;

[0043] 7. Heat-absorbing component; 701. Heat-conducting plate; 702. Connecting rod; 703. Connecting frame; 704. Slide rod; 705. Spring;

[0044] 8. Inclined plate; 801. Through hole. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In this invention, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this invention is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed herein.

[0047] Example

[0048] Please see Figures 1-5 In this embodiment of the invention, a multi-stage segmented heat pump water heater heat exchange structure includes:

[0049] The heat exchange box 1 has a first heat exchange chamber formed inside it for containing the heat exchange medium;

[0050] At least one liquid inlet pipe 2 is disposed in the first heat exchange chamber for conveying the liquid to be heated;

[0051] Water outlet pipe 3 is connected to the outlet end of liquid inlet pipe 2 and is used to discharge the heated gas;

[0052] Heater 5 is disposed inside the heat exchange box 1 and is used to heat the heat exchange medium;

[0053] The circulation component 6 has its inlet connected to the lower region of the heat exchange box 1 and its outlet connected to the upper region of the heat exchange box 1. It is used to pump the higher temperature medium at the bottom of the heat exchange box 1 to the top to achieve uniformity of medium temperature.

[0054] Multiple heat-absorbing components 7 are arranged in sections in the first heat exchange chamber along the extension direction of the liquid inlet pipe 2. Each heat-absorbing component 7 abuts against the outer wall of the liquid inlet pipe 2 and is used to efficiently transfer the heat of the heat exchange medium to the liquid inlet pipe 2.

[0055] A multi-stage flow guiding structure is provided inside the liquid inlet pipe 2 to extend the flow path and residence time of the liquid to be heated within the liquid inlet pipe 2.

[0056] Inside the heat exchange chamber 1, there is a liquid inlet pipe 2 made of stainless steel or copper. This inlet pipe 2 is generally straight, running horizontally or slightly inclined through the entire first heat exchange chamber. The left end (inlet end) of the inlet pipe 2 passes through the left side wall of the heat exchange chamber 1 and extends outward to connect to an external liquid source to be heated (e.g., low-temperature, low-pressure liquid refrigerant from the heat pump expansion valve). The right end (outlet end) of the inlet pipe 2 is connected to a water outlet pipe 3 via a pressure relief valve 4. The water outlet pipe 3 passes through the right side wall of the heat exchange chamber 1 and extends outward to deliver heated gas (e.g., gaseous refrigerant) to the suction port of the heat pump compressor.

[0057] Heater 5 uses a high-power electric heating element, which is bent into a serpentine coil shape to increase the contact area with water and improve heating efficiency. Heater 5 is electrically connected to an external temperature control system via a cable.

[0058] In some embodiments, the multi-stage flow guiding structure includes a plurality of inclined plates 8 arranged alternately along the axial direction of the liquid inlet pipe 2, each of the inclined plates 8 being fixedly connected to the inner wall of the liquid inlet pipe 2, and each of the inclined plates 8 having a plurality of through holes 801.

[0059] In some embodiments, the circulation component 6 includes a pump pipe 601, a pump 602, and a drain pipe 603; one end of the pump pipe 601 is connected to the bottom of the heat exchange box 1, and the other end is connected to the inlet of the pump 602; one end of the drain pipe 603 is connected to the outlet of the pump 602, and the other end is connected to the top of the heat exchange box 1.

[0060] The water pumping pipe 601 is a heat-resistant pipe. One end (lower end) passes through the left side wall of the heat exchange box 1 and extends to the bottom of the box (near the heater 5) to ensure that the water that has just been heated, with a low density but a high actual temperature is drawn in. (Under natural convection, hot water rises and the bottom is actually relatively cold. It needs to be clarified here that the bottom is usually cold water and the top is hot water.)

[0061] The lower inlet of the water pump 601 is located in the high-temperature zone at the bottom of the heat exchanger 1. After the water pump 602 starts, it draws out the high-temperature water from the bottom and discharges it into the top of the heat exchanger 1 (i.e., the cooler upper area) through the drain pipe 603. This process achieves "high-temperature water injection from the top," thereby rapidly increasing the water temperature at the top and making the overall water temperature more uniform. A showerhead-shaped distributor can be installed at the outlet of the drain pipe 603 to evenly distribute the hot water in the top water layer.

[0062] In some embodiments, the heat-absorbing component 7 includes:

[0063] A pair of heat-conducting plates 701 are attached to the outer walls of the liquid inlet pipe 2 on both sides;

[0064] A connecting rod 702, one end of which is fixedly connected to the outer side of the heat-conducting plate 701;

[0065] The connecting bracket 703 is fixedly connected to the other end of the connecting rod 702;

[0066] At least one slide rod 704 is fixedly installed on the inner wall of the heat exchange box 1 and slides in cooperation with the heat conduction plate 701;

[0067] And an elastic element 705, sleeved on the slide rod 704, one end of which abuts against the heat-conducting plate 701 and the other end abuts against the inner wall of the heat exchange box 1, for providing a pre-tightening force to make the heat-conducting plate 701 tightly adhere to the liquid inlet pipe 2.

[0068] In some embodiments, the side of the heat-conducting plate 701 facing the liquid inlet pipe 2 is an arc-shaped curved surface that matches the outer wall of the liquid inlet pipe 2, and the heat-conducting plate 701 is made of copper or aluminum alloy.

[0069] Each heat-absorbing assembly 7 includes two heat-conducting plates 701, two connecting rods 702, two connecting brackets 703, two sliding rods 704, and two springs 705. The two heat-conducting plates 701 are respectively arranged on the front and rear sides (or the top and bottom sides) of the liquid inlet pipe 2, forming a clamping structure. The side of each heat-conducting plate 701 facing the liquid inlet pipe 2 is machined into an arc-shaped concave surface that matches the outer diameter of the liquid inlet pipe 2, so as to maximize its fit against the outer wall of the pipe. The heat-conducting plates 701 are made of copper and have excellent thermal conductivity.

[0070] A metal connecting rod 702 is vertically welded to the center of the outer side (away from the liquid inlet pipe 2) of each heat-conducting plate 701. The other end of the connecting rod 702 is welded to a rectangular connecting bracket 703. Guide holes are provided at both ends of the connecting bracket 703.

[0071] Two parallel sliding rods 704 are fixed between the front and rear inner walls (or between the upper and lower inner walls) of the heat exchange box 1, and each sliding rod 704 passes through the guide holes at both ends of the connecting frame 703. In this way, the entire assembly consisting of the heat conduction plate 701, the connecting rod 702 and the connecting frame 703 can slide along the axial direction of the sliding rods 704.

[0072] A compressed helical spring 705 is fitted onto each slide rod 704. One end of the spring 705 rests against the connecting frame 703, and the other end rests against the inner wall of the heat exchange chamber 1. Under the elastic force of the spring 705, the connecting frame 703 is pushed towards the liquid inlet pipe 2, which in turn pushes the heat-conducting plate 701 tightly against the outer wall of the liquid inlet pipe 2 via the connecting rod 702. This design allows the heat-conducting plate 701 to adaptively and tightly fit the liquid inlet pipe 2, maintaining good thermal contact even if the pipe has slight bends or diameter changes.

[0073] In some embodiments, the liquid inlet pipe 2 and the water outlet pipe 3 are connected by a pressure relief valve 4, which is used to automatically open when the pressure in the liquid inlet pipe 2 exceeds a preset threshold, so that the heated gas enters the water outlet pipe 3.

[0074] Pressure relief valve 4 is a normally closed safety valve with a set opening pressure of 0.8 MPa. When the pressure in the inlet pipe 2 (mainly due to the expansion of the liquid due to heating) exceeds 0.8 MPa, pressure relief valve 4 automatically opens, discharging the gaseous medium into the outlet pipe 3, thereby maintaining the pressure stability in the inlet pipe 2. When the pressure drops below 0.6 MPa, pressure relief valve 4 automatically closes.

[0075] In some embodiments, a cover plate 101 is movably connected to the top of the heat exchange chamber 1, an inlet pipe 102 for injecting heat exchange medium is provided on the cover plate 101, and an outlet pipe 103 for discharging heat exchange medium is provided on the lower part of the side wall of the heat exchange chamber 1.

[0076] In some embodiments, the heater 5 is an electric heating tube, arranged in a serpentine or spiral shape at the bottom of the heat exchange box 1.

[0077] In some embodiments, the number of heat-absorbing components 7 is three to five, which are distributed at equal intervals along the axial direction of the liquid inlet pipe 2 to form a segmented enhanced heat exchange structure.

[0078] In some embodiments, the angle between the inclined plate 8 and the axis of the liquid inlet pipe 2 is 30° to 60°, the diameter of the through hole 801 is 2mm to 5mm, and the projections of two adjacent inclined plates 8 on the axial direction of the liquid inlet pipe 2 at least partially overlap.

[0079] Each inclined plate 8 is a rectangular or elliptical thin plate, with one side welded to the inner wall of the pipe and the other side extending freely, leaving a gap between it and the inner wall of the pipe (or directly abutting against the opposite inner wall). In this embodiment, a gap of about 5mm is left between the free end of the inclined plate 8 and the inner wall of the pipe to avoid complete blockage.

[0080] Each inclined plate 8 forms an angle α with the axis of the liquid inlet pipe 2, which is 45° in this embodiment. Multiple circular through holes 801 are evenly distributed on the surface of each inclined plate 8, with a diameter of 3 mm in this embodiment.

[0081] Adjacent inclined plates 8 are arranged in a staggered pattern in space. For example, the first inclined plate 8 extends downwards from the top of the pipe, while the second inclined plate 8 extends upwards from the bottom of the pipe. Furthermore, the projection planes of adjacent inclined plates 8 overlap in the projection direction along the pipe axis. Any liquid flowing along the pipe axis cannot pass in a straight line without impacting the inclined plates 8. The liquid must bypass the free end of the inclined plate 8 or pass through the through-hole 801 to continue its journey. This significantly lengthens the actual flow path of the liquid within the pipe, increasing the heat exchange time with the heated pipe wall.

[0082] The working principle of this invention is:

[0083] In use, water is injected into the heat exchange chamber 1 through the inlet pipe 102, and the heater 5 is activated to heat the water. Then, the liquid to be heat-exchanged is input through the liquid inlet pipe 2. After entering the liquid inlet pipe 2, the liquid to be heat-exchanged is heated by the temperature of the water in the heat exchange chamber 1. The gas generated after heating is discharged through the outlet pipe 3. By setting the inclined plate 8 in the liquid inlet pipe 2, the residence time of the liquid to be heat-exchanged in the liquid inlet pipe 2 can be increased, thereby increasing the heating time and improving the heating efficiency. At the same time, the water pump 602 is activated, and water is pumped through the pump pipe. 601 extracts water from the high-temperature water area at the bottom of the heat exchange box 1, and then discharges the extracted water into the cooler water area at the top of the heat exchange box 1 through the drain pipe 603. This accelerates the rise in water temperature inside the heat exchange box 1 and makes the water temperature inside the heat exchange box 1 uniform, ensuring that the liquid inlet pipe 2 is heated evenly. At the same time, the heat conduction plate 701 structure further improves the heating effect of the liquid inlet pipe 2, reduces the heating time of the liquid inlet pipe 2, and improves efficiency. Furthermore, the elastic potential energy of the spring 705 facilitates the movement of the heat conduction plate 701 to tightly adhere to the liquid inlet pipes 2 of different sizes.

[0084] 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 multi-stage segmented heat pump water heater heat exchange structure, characterized in that, include: A heat exchange box (1) has a first heat exchange chamber inside for containing the heat exchange medium. At least one liquid inlet pipe (2) is disposed in the first heat exchange chamber; The water outlet pipe (3) is connected to the outlet end of the liquid inlet pipe (2); Heater (5) is installed inside the heat exchange box (1); The circulation component (6) has its inlet connected to the lower region of the heat exchange box (1) and its outlet connected to the upper region of the heat exchange box (1), and is used to pump the higher temperature medium at the bottom of the heat exchange box (1) to the top. Multiple heat-absorbing components (7) are arranged in sections in the first heat exchange chamber along the extension direction of the liquid inlet pipe (2), and each heat-absorbing component (7) abuts against the outer wall of the liquid inlet pipe (2). And a multi-stage flow guiding structure is provided inside the liquid inlet pipe (2) to extend the flow path and residence time of the liquid to be heated in the liquid inlet pipe (2).

2. The heat exchange structure of a multi-stage segmented heat pump water heater according to claim 1, characterized in that, The multi-stage flow guiding structure includes multiple inclined plates (8) arranged alternately along the axial direction of the liquid inlet pipe (2). Each inclined plate (8) is fixedly connected to the inner wall of the liquid inlet pipe (2), and each inclined plate (8) has multiple through holes (801).

3. The heat exchange structure of a multi-stage segmented heat pump water heater according to claim 2, characterized in that, The circulation component (6) includes a water pump (601), a water pump (602), and a drain pipe (603); one end of the water pump (601) is connected to the bottom of the heat exchange box (1), and the other end is connected to the inlet of the water pump (602); one end of the drain pipe (603) is connected to the outlet of the water pump (602), and the other end is connected to the top of the heat exchange box (1).

4. The heat exchange structure of a multi-stage segmented heat pump water heater according to claim 3, characterized in that, The heat-absorbing component (7) includes: A pair of heat-conducting plates (701) are attached to the outer walls of the liquid inlet pipe (2) respectively; A connecting rod (702) is fixedly connected at one end to the outer side of the heat-conducting plate (701); The connecting bracket (703) is fixedly connected to the other end of the connecting rod (702); At least one slide rod (704) is fixedly installed on the inner wall of the heat exchange box (1) and slides in cooperation with the heat conduction plate (701); And an elastic element (705) is sleeved on the slide rod (704), one end of which abuts against the heat-conducting plate (701) and the other end abuts against the inner wall of the heat exchange box (1), for providing a pre-tightening force to make the heat-conducting plate (701) fit tightly against the liquid inlet pipe (2).

5. The heat exchange structure of a multi-stage segmented heat pump water heater according to claim 4, characterized in that, The side of the heat-conducting plate (701) facing the liquid inlet pipe (2) is an arc-shaped curved surface that matches the outer wall of the liquid inlet pipe (2), and the heat-conducting plate (701) is made of copper or aluminum alloy.

6. The heat exchange structure of a multi-stage segmented heat pump water heater according to claim 5, characterized in that, The inlet pipe (2) and the outlet pipe (3) are connected by a pressure relief valve (4).

7. The heat exchange structure of a multi-stage segmented heat pump water heater according to claim 1, characterized in that, The top of the heat exchange box (1) is movably connected to a cover plate (101), and the cover plate (101) is provided with an inlet pipe (102) for injecting heat exchange medium, and the lower part of the side wall of the heat exchange box (1) is provided with an outlet pipe (103) for discharging heat exchange medium.

8. The heat exchange structure of a multi-stage segmented heat pump water heater according to claim 1, characterized in that, The heater (5) is an electric heating tube, which is arranged in a serpentine or spiral shape at the bottom of the heat exchange box (1).

9. The heat exchange structure of a multi-stage segmented heat pump water heater according to claim 1, characterized in that, The number of heat-absorbing components (7) is three to five, and they are distributed at equal intervals along the axial direction of the liquid inlet pipe (2) to form a segmented enhanced heat exchange structure.

10. The heat exchange structure of a multi-stage segmented heat pump water heater according to claim 1, characterized in that, The angle between the inclined plate (8) and the axis of the liquid inlet pipe (2) is 30° to 60°, the diameter of the through hole (801) is 2mm to 5mm, and the projections of two adjacent inclined plates (8) on the axial direction of the liquid inlet pipe (2) at least partially overlap.

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