Air energy water heater

Abstract

Compared with the prior art, according to the air energy water heater, a detachable cover body is arranged on a water tank, and a magnetic induction assembly, a magnesium rod and a magnetic body are arranged below the cover body. A magnetic induction body located at a second distance position of a base plane and a magnetic body located at a first distance position of the base plane under the supporting action of a magnesium rod are detachably arranged below a cover body of the water tank, and after the magnesium rod is continuously consumed, the magnetic body falls down and the distance between the magnetic body and the magnetic induction body is gradually shortened to generate magnetic induction; the reminding unit connected with the magnetic induction assembly sends out the reminding signal so as to send out the reminding information of replacing the magnesium rod before the magnesium rod is about to be consumed up, the early warning performance when the magnesium rod of the air energy water heater is about to be consumed up is improved, and a user can prepare to replace the magnesium rod in advance.

Description

Technical Field

[0001] This utility model relates to the field of household appliances, and in particular to an air source water heater. Background Technology

[0002] Currently, air source heat pump water heaters typically use stainless steel with a corrosion-resistant enamel coating as the inner tank structure. However, due to the inability to guarantee the uniformity of the enamel material and the presence of welds on the inner tank, using enamel alone is insufficient to prevent corrosion. Therefore, water heater manufacturers add magnesium rods to the tank, using the principle of "sacrificial anode corrosion protection" to extend the tank's lifespan. Magnesium rods are chemically more reactive than the tank's inner structure, preferentially reacting with oxygen, minerals (such as calcium and magnesium ions), and trace electrolytes in the water, thus protecting the inner tank from corrosion. However, due to regional differences in water quality, the consumption of magnesium rods varies. Furthermore, the magnesium rod is deeply embedded inside the tank, making it impossible for users to visually observe it. Current air source heat pump water heaters lack sufficient early warning mechanisms to detect when the magnesium rod is depleted, making it difficult to issue timely alerts when it is nearing depletion. If a user is only alerted after the magnesium rod is completely depleted, there may be no anode layer available when the user prepares to replace the rod, leading to tank corrosion and shortening the tank's lifespan. Utility Model Content

[0003] This utility model provides an air source water heater that aims to solve the problem of insufficient early warning when the magnesium rod in the water tank of existing air source water heaters is about to be consumed or when it is consumed, which leads to a shortened service life of the water tank.

[0004] In a first aspect, this utility model provides an air source water heater, comprising: a water tank; a cover having a base surface, the cover being detachably mounted on the water tank; a magnetic sensing component disposed at a second distance below the base surface; a reminder unit communicatively connected to the magnetic sensing component; a magnesium rod disposed below the cover; and a magnetic body supported by the magnesium rod, the magnetic body being located at a first distance below the base surface, the magnetic body being vertically movable below the cover; wherein, when the magnesium rod is depleted to the point where it can no longer support the magnetic body, the magnetic body falls to the second distance below the base surface under the influence of gravity, the magnetic sensing component detects the magnetic body, and the reminder unit issues a reminder message to replace the magnesium rod.

[0005] In the air source water heater provided by this utility model, the water tank is provided with an outer cover hole, the cover body includes an inner screw cover and an outer screw cover, the base surface is provided on the outer screw cover, the outer screw cover is detachably provided on the outer cover hole, the outer screw cover is provided with an inner cover hole, the inner screw cover is detachably provided on the inner cover hole, the magnetic sensing component and the magnetic body are provided below the inner screw cover, and the magnesium rod is connected to the outer screw cover.

[0006] The air source water heater provided by this utility model also includes a protective tube, which is located below the inner rotary cover, and the magnetic sensing component is located inside the protective tube.

[0007] In the air source water heater provided by this utility model, the top of the magnesium rod is recessed downward to form a first receiving cavity, the bottom of the first receiving cavity is recessed downward to form a second receiving cavity, the magnetic body is disposed in the first receiving cavity, and the protective tube is disposed in the second receiving cavity.

[0008] In the air source water heater provided by this utility model, the protective tube abuts against the inner wall of the second receiving cavity.

[0009] The air source water heater provided by this utility model also includes a flexible connector to connect the magnetic body and the cover. The flexible connector is used to constrain the distance between the magnetic body and the base surface to not exceed the second distance.

[0010] In the air source water heater provided by this utility model, the flexible connector is a spiral spring. One end of the spiral spring is connected to the inner rotating cover, and the other end of the spiral spring is connected to a magnetic body. The spiral spring is used to make the magnetic body fit against the protective tube.

[0011] In the air source water heater provided by this utility model, a sealing element is provided between the outer rotating cover and the water tank.

[0012] In the air source water heater provided by this utility model, the inner screw cap is provided with a first external thread, and the hole wall of the inner cap hole is provided with a first internal thread. The first external thread and the first internal thread are rotated together in a first direction. The outer screw cap is provided with a second external thread, and the hole wall of the outer cap hole is provided with a second internal thread. The second external thread and the second internal thread are rotated together in a second direction. The first direction and the second direction are opposite.

[0013] In the air source water heater provided by this utility model, the magnetic body is provided with a protective layer, and the material of the protective layer is polytetrafluoroethylene.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In the technical solution of this utility model, a detachable cover is provided on the water tank, and a magnetic induction component, a magnesium rod, and a magnetic body are provided below the cover. By having the magnetic induction body located at a second distance from the base surface and the magnetic body located at a first distance from the base surface under the support of the magnesium rod located below the detachable cover of the water tank, as the magnesium rod is continuously consumed, the magnetic body falls and gradually shortens the distance with the magnetic induction body, generating magnetic induction. This causes the reminder unit connected to the magnetic induction component to issue a reminder signal, thereby issuing a reminder message to replace the magnesium rod before it is about to be consumed. This improves the early warning of when the magnesium rod of the air source water heater is about to be consumed, allowing users to prepare to replace the magnesium rod in advance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an air source water heater according to an embodiment of the present invention;

[0018] Figure 2 This is an enlarged view A of the structural schematic diagram of the air source water heater according to an embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the air source water heater in an embodiment of the present invention when the magnesium rod is not consumed;

[0020] Figure 4 This is a schematic diagram of the magnesium rod in the air source water heater of this utility model when it is completely consumed;

[0021] Figure 5 This is a schematic diagram of one embodiment of the air source water heater of this utility model;

[0022] Figure 6 This is a structural schematic diagram of an embodiment of the air source water heater of this utility model;

[0023] Figure label explanation:

[0024] 1. Cap body; 11. Outer screw cap; 12. Inner screw cap; 13. Inner cap hole; 14. Base surface; 15. Edge protector;

[0025] 2. Magnetic induction assembly; 21. Reed switch; 22. Protective tube; 23. Wire;

[0026] 3. Magnetic body; 31. Magnet; 32. Flexible connector; 321. Snail spring;

[0027] 4. Magnesium rod; 41. First receiving cavity; 42. Second receiving cavity;

[0028] 5. Water tank; 51. Outer cover hole; 52. Seal; 53. Inner liner of water tank; 54. Outer shell of water tank; 55. Microchannel condenser; 56. Refrigerant connection pipe;

[0029] 6. Reminder Unit. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0032] This utility model provides an air source heat pump water heater, aiming to solve the problem in existing air source heat pump water heaters where the magnesium rod 4 in the water tank 5 is about to be consumed or the early warning system indicates when it is about to be consumed, leading to a shortened service life of the water tank 5. (Refer to...) Figures 1 to 6 The air source heat pump water heater of this utility model includes: a water tank 5; a cover 1 with a base surface 14, the cover 1 being detachably mounted on the water tank 5; a magnetic sensing component 2, located at a second distance below the base surface 14; a reminder unit 6, communicatively connected to the magnetic sensing component 2; a magnesium rod 4, located below the cover 1; and a magnetic body 3, supported by the magnesium rod 4, located at a first distance below the base surface 14, and vertically movable below the cover 1. When the magnesium rod 4 is depleted to the point where it can no longer support the magnetic body 3, the magnetic body 3 falls to a second distance below the base surface 14 under gravity. The magnetic sensing component 2 detects the magnetic body 3, and the reminder unit 6 issues a reminder to replace the magnesium rod 4. The main function of the water tank 5 is water storage. Figure 6In this embodiment, the compressor, electronic expansion valve, and evaporator located in the outdoor unit of the water heater, together with the microchannel condenser 55 coiled on the outer wall of the water tank 5, form a complete heating system via a refrigerant connection pipe 56. The refrigerant circulates within this system. The refrigerant releases heat through the microchannel condenser 55, which is then transferred to the inner tank liner 53, thereby heating the water in the water tank 5. The water tank 5 has an inner and outer layer structure, consisting of an inner tank liner 53 and an outer tank shell 54. The outer tank shell 54 uses insulation material, which prevents heat loss from the condenser and the inner tank liner 53, allowing the heat from the condenser to heat the water inside the inner tank liner 53 as much as possible. It also serves to secure the condenser. The outdoor unit of the water heater is connected to an external power source, and the control board on the water heater is the main control unit. The cover 1 is a sealing element 52 covering the water tank 5. By providing the cover 1, when necessary, such as when maintenance of the inside of the water tank 5 or replacement of the magnesium rod 4 is required, spatial interaction between the inside and outside of the water tank 5 can be achieved. When not in use, the cover 1 is fixed to the water tank 5 by bolts or a fitting structure, ensuring that the water tank 5 is leak-proof and can maintain the water temperature. The magnetic sensing component 2 is designed to be installed below the base surface 14 of the cover 1, and typically uses a sensing element to detect the movement of the magnetic body 3. Specifically, the so-called magnetic body 3 is usually a permanent magnet 31. In the embodiments of this utility model, the reed switch 21 is used as the component for magnetic induction in the magnetic sensing component 2, and a Hall switch can also be used instead. The use of the reed switch 21 in the magnetic sensing component 2 makes it more durable because it does not have a complex electronic structure. At the same time, the reed switch 21 does not require an external power supply when working, and only relies on the effect of the magnetic field, resulting in lower energy consumption, which is beneficial to further energy saving of the air source water heater. The reminder unit 6 is connected to the magnetic sensing component 2 by a circuit. When the magnetic sensing component 2 senses a change in the position of the magnetic body 3, the reminder unit 6 will remind the user to replace the magnesium rod 4 through a visual or audible signal. The visual signal is achieved by connecting an indicator light in series on the wire 23, and the audible signal is achieved by connecting a buzzer in series on the wire 23. Considering that the audible signal from the buzzer in a user's home environment could affect their life, this embodiment uses an indicator light connected in series with the wire 23 of the reed switch 21 to provide a notification to the user. Furthermore, after the wire 23 is connected to the water heater's control board, the information about the change in the position of the magnetic body 3 sensed by the magnetic sensing component 2 can be sent to the server via the Internet of Things through a remote communication module located in the control board. This allows the user to view and receive a notification that the magnesium rod 4 is about to run out of power through the smart home interconnection APP. The magnesium rod 4 itself is not magnetic; the magnetic field generated by the magnet 31 acts on the reed switch 21. Since the magnesium rod 4 will gradually be consumed after a period of use, when the magnetic body 3 is supported by the magnesium rod 4, the distance from the base surface 14 is H1, which is the first distance. After the magnesium rod 4 is consumed to a certain extent, it can no longer support the magnetic body 3, causing the magnetic body 3 to begin to fall.Magnetic body 3, unable to be supported by magnesium rod 4, falls to a distance of 14H2 from the base surface (H2 being the second distance). Magnetic body 3 then approaches reed switch 21, causing the metal plate inside reed switch 21 to close, thereby activating the detection circuit and triggering a warning signal from reminder unit 6. At this point, magnesium rod 4 is nearing depletion, giving the user ample time to purchase a replacement and arrange for professional replacement, rather than waiting until magnesium rod 4 is completely depleted. This provides a degree of early warning, allowing users to more easily manage the situation when magnesium rod 4 in the water heater's tank 5 runs out.

[0033] Compared with the prior art, in the technical solution of this utility model, a detachable cover 1 is provided on the water tank 5, and a magnetic sensing component 2, a magnesium rod 4, and a magnetic body 3 are provided below the cover 1. By setting the magnetic sensing body at a second distance position on the base surface 14 below the cover 1 of the water tank 5 and the magnetic body 3 at a first distance position on the base surface 14 under the support of the magnesium rod 4, as the magnesium rod 4 is continuously consumed, the magnetic body 3 falls and gradually shortens the distance with the magnetic sensing body, generating magnetic induction. This causes the reminder unit 6 connected to the magnetic sensing component 2 to issue a reminder signal, thereby issuing a reminder message to replace the magnesium rod 4 before it is about to be consumed. This improves the early warning when the magnesium rod 4 of the air source water heater is about to be consumed, allowing users to prepare to replace the magnesium rod 4 in advance.

[0034] Furthermore, referring to Figure 2 Because the cover 1 is removable, after receiving a reminder to replace the magnesium rod 4, the user only needs to remove the cover 1 to take out the used magnesium rod 4. Since the reed switch 21 and the magnet 3 are reusable, the user only needs to replace the rod. This design not only reduces replacement costs but also improves the utilization efficiency of parts, significantly reduces maintenance costs, and extends the service life of the components.

[0035] In one embodiment, reference is made to Figure 1 and Figure 2The water tank 5 has an outer cover hole 51. The cover body 1 includes an inner screw cap 12 and an outer screw cap 11. The base surface 14 is provided on the outer screw cap 11. The outer screw cap 11 is detachably provided on the outer cover hole 51. The outer screw cap 11 has an inner cover hole 13. The inner screw cap 12 is detachably provided on the inner cover hole 13. The magnetic induction component 2 and the magnetic body 3 are located below the inner screw cap 12. The magnesium rod 4 is connected to the outer screw cap 11. The water tank 5 has an outer cover hole 51 for installing the outer screw cap 11. The cover body 1 is composed of an inner screw cap 12 and an outer screw cap 11. The outer screw cap 11 is detachably provided on the outer cover hole 51 of the water tank 5, and the inner screw cap 12 is detachably installed on the inner cover hole 13 of the outer screw cap 11. The magnetic sensing component 2 and the magnetic body 3 are located below the inner rotating cover 12, allowing users to easily remove these reusable components at once when disassembling the inner cover 1. The magnesium rod 4 is connected to the outer rotating cover 11. When the magnesium rod 4 needs replacement, only the outer rotating cover 11 needs to be removed. The easy-to-remove design of both the inner and outer rotating covers 11 makes replacing the magnesium rod 4 more convenient. A sealing ring is also provided at the connection between the outer and inner rotating covers 11 to ensure that the water tank 5 does not leak and to prevent moisture from entering the sensing component area. This optimized sealing structure improves the overall lifespan and safety of the water heater.

[0036] In one embodiment, reference is made to Figures 2 to 4 The system also includes a protective tube 22, which is located below the inner screw cap 12, and the magnetic sensing component 2 is disposed within the protective tube 22. The protective tube 22 is typically made of high-temperature resistant and corrosion-resistant plastic or metal materials to withstand the high temperatures and moisture in the water heater's operating environment. The protective tube 22 effectively prevents water vapor or other liquids from seeping into the area of ​​the magnetic sensing component 2. The protective tube 22 is cylindrical or other suitable geometric shape to accommodate the magnetic sensing component 2; in this embodiment, a cylindrical protective tube 22 is used. The magnetic sensing component 2 should be installed inside the protective tube 22 and maintain an appropriate distance from the magnetic body 3 below the inner screw cap 12. That is, the magnetic sensing component 2 is installed at a distance of 14H2 from the base surface, and the magnetic body 3 is supported by the magnesium rod 4 at a distance of 14H1 from the base surface. The distance difference between H1 and H2 ensures that the sensing component is not affected by the magnetic body 3.

[0037] In one embodiment, reference is made to Figure 3The magnesium rod 4 has a first recessed cavity 41 at its top and a second recessed cavity 42 at its bottom. The magnetic body 3 is disposed within the first cavity 41, and the protective tube 22 is disposed within the second cavity 42. The magnesium rod 4 has a first recessed cavity 41 at its top, and the bottom of the first cavity 41 is also recessed to form the second cavity 42. The magnetic body 3 is placed within the first cavity 41, and the protective tube 22 is located within the second cavity 42. By establishing cavities at the top and bottom of the magnesium rod 4, a layered structure is formed, allowing the magnetic body 3 and the protective tube 22 to be tightly and stably disposed within the magnesium rod 4, while avoiding interference and mutual influence between them. The first cavity 41 provides suitable space for the magnetic body 3, while the second cavity 42 provides additional protective space to ensure that the protective tube 22 is not damaged by the external environment, mainly referring to steam and water in the water tank 5, thus improving the stability and reliability of its use.

[0038] In one embodiment, reference is made to Figure 3 The protective tube 22 abuts against the inner wall of the second receiving cavity 42. The friction between the protective tube 22 and the inner wall of the second receiving cavity 42 further supports the magnesium rod 4, making the installation of the magnesium rod 4 more stable and less likely to cause the magnesium rod 4 to break due to consumption and fall off prematurely, thus preventing false alarms of consumption status.

[0039] Furthermore, referring to Figures 2 to 4 Below the inner rotating cover 12, there is also a protective edge 15, which abuts against the inner side wall of the first receiving cavity 41. The purpose of the protective edge 15 is to reduce the collision between the magnetic body 3 and the magnesium rod 4 caused by environmental vibration during the use of the water heater, protect the magnesium rod 4, and prevent the magnesium rod 4 from breaking prematurely during use.

[0040] In one embodiment, reference is made to Figures 2 to 4The device also includes a flexible connector 32 connecting the magnetic body 3 and the cover 1. The flexible connector 32 is used to constrain the distance between the magnetic body 3 and the base surface 14 to not exceed a second distance. The main function of the flexible connector 32 is to connect the magnetic body 3 and the cover 1 and limit the distance between the magnetic body 3 and the base surface 14. The flexible connector 32 ensures that the magnetic body 3 maintains a suitable distance from the cover 1 during operation, so that the magnetic body 3 can interact with the reed switch 21 to activate the detection circuit when necessary. With the flexible connector 32 constraining the magnetic body 3, the second distance refers to a maximum allowable distance between the magnetic body 3 and the cover 1. The flexible connector 32 ensures that the distance between the magnetic body 3 and the cover 1 will not exceed this maximum value, thereby ensuring the stability and working effect of the device. At the same time, the flexible connector 32 can also effectively prevent the magnetic body 3 from shifting due to vibration, external force, or water flow, thus affecting the operation of the water heater. The flexible connector 32 is usually made of a material with good flexibility and high temperature resistance. For example, silicone, rubber, or polymer materials (such as TPU or TPE) can all be used as materials for the flexible connector 32. These materials can ensure sufficient flexibility while withstanding the high temperature and steam environment during the operation of the water heater. The flexible connector 32 can be combined with the fixing structure of the magnetic body 3 and the cover 1, usually by means of buckles, ring-shaped fixing devices, or screws, to reliably connect the flexible connector 32 to the magnetic body 3 and the cover 1.

[0041] Furthermore, referring to Figure 5 The flexible connector 32 is a spiral spring 321. One end of the spiral spring 321 is connected to the inner rotating cover 12, and the other end is connected to the magnetic body 3. The spiral spring 321 is used to keep the magnetic body 3 in contact with the protective tube 22. The spiral spring 321 constrains the distance between the magnetic body 3 and the protective tube 22, ensuring that the magnetic body 3 remains in contact with the protective tube 22 during operation. One end of the spiral spring 321 is connected to the inner rotating cover 12, and the other end is connected to the magnetic body 3. Through the elasticity of the spiral spring 321, the distance between the magnetic body 3 and the protective tube 22 is effectively controlled. At the same time, the spiral spring 321 also provides a certain elastic restoring force, ensuring that the magnetic body 3 always maintains a suitable relative position. The application of the spiral spring 321 greatly improves the stability of the internal components of the water heater and avoids the influence of external interference, such as water flow or temperature changes, on the position of the magnetic body 3. As the magnesium rod 4 is consumed, the magnetic body 3 will gradually move as the magnesium rod 4 is consumed. The restoring force provided by the spiral spring 321 keeps the magnetic body 3 in contact with the protective tube 22.

[0042] In one embodiment, reference is made to Figure 2A sealing element 52 is provided between the outer cap 11 and the water tank 5. The sealing element 52 is used to improve the overall sealing performance of the water tank 5. Since the outer cap 11 and the water tank 5 are detachable, the user needs to remove the outer cap 11 to replace the magnesium rod 4. After the user reinstalls the outer cap 11, the sealing element 52 can effectively ensure the sealing performance between the outer cap 11 and the outer cap hole 51, thereby ensuring that water vapor in the tank will not leak into the environment. In addition, the sealing element 52 has a certain degree of elasticity, which can alleviate some of the vibration transmission between the outer cap 11 and the water tank 5 and reduce wear.

[0043] In one embodiment, reference is made to Figure 2 The inner screw cap 12 has a first external thread, and the inner cap hole 13 has a first internal thread on its wall. The first external thread and the first internal thread are rotatably engaged in a first direction. The outer screw cap 11 has a second external thread, and the outer cap hole 51 has a second internal thread on its wall. The second external thread and the second internal thread are rotatably engaged in a second direction, with the first direction and the second direction being opposite. The inner screw cap 12 and the outer screw cap 11 are connected to other components through their respective threaded structures. The first external thread of the inner screw cap 12 engages with the first internal thread, and the second external thread of the outer screw cap 11 engages with the second internal thread, with the two directions being opposite. This means that when the inner screw cap 12 rotates out from the outer screw cap 11, the outer screw cap 11 will not be rotated out. This ensures a stable connection between the outer screw cap 11 and the water tank 5. The first direction is opposite to the second direction, which can effectively enhance the locking force between the inner screw cap 12 and the outer screw cap 11, and between the outer screw cap 11 and the water tank 5, prevent the threads from loosening during use, and help improve the stability of the overall structure in environments such as high temperature and vibration, and prevent leakage or loosening.

[0044] In one embodiment, the magnetic body 3 is provided with a protective layer made of polytetrafluoroethylene (PTFE). Since the magnetic component of the magnetic body 3 is the magnet 31, a PTFE protective layer is needed to ensure that the magnet 31 is not affected by the environment during long-term use. The protective layer should completely enclose the magnet 31, ensuring that the magnet 31 is isolated from the inner wall of the water tank 5, the magnesium rod 4, and other components, preventing corrosion from water or chemicals. The PTFE protective layer will not undergo thermal degradation due to high temperatures in the water heater's operating environment. Simultaneously, the PTFE protective layer also possesses a certain mechanical strength to prevent damage from external impacts. Protected by the PTFE protective layer, the magnet 31 can be used in the water heater for a long time without corrosion or oxidation, thereby extending the service life of the magnet 31 and reducing maintenance costs.

[0045] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An air energy water heater, characterized by, The utility model relates to a water tank, a cover body, a magnetic sensing assembly, a reminding unit and a magnesium rod. The water tank comprises: A water tank; A cover body provided with a base surface, the cover body being detachably arranged on the water tank; A magnetic sensing assembly arranged at a second distance below the base surface; A reminding unit in communication connection with the magnetic sensing assembly; A magnesium rod arranged below the cover body; A magnetic body supported by the magnesium rod, the magnetic body being arranged at a first distance below the base surface and vertically movably arranged below the cover body; 2. The air energy water heater of claim 1, wherein, When the magnesium rod is consumed to be insufficient to support the magnetic body, the magnetic body falls to the second distance below the base surface under the action of gravity, the magnetic sensing assembly detects the magnetic body, and the reminding unit sends reminding information for replacing the magnesium rod.

3. The air energy water heater of claim 2, wherein, The water tank is provided with an outer cover hole, the cover body comprises an inner screw cover and an outer screw cover, the base surface is arranged on the outer screw cover, the outer screw cover is detachably arranged on the outer cover hole, the outer screw cover is provided with an inner cover hole, the inner screw cover is detachably arranged on the inner cover hole, the magnetic sensing assembly and the magnetic body are arranged below the inner screw cover, and the magnesium rod is connected to the outer screw cover.

4. The air energy water heater of claim 3, wherein, Further comprising a protection tube arranged below the inner screw cover, and the magnetic sensing assembly is arranged in the protection tube.

5. An air energy water heater as claimed in claim 4 wherein, The top of the magnesium rod is concave downward to form a first accommodating cavity, the bottom of the first accommodating cavity is concave downward to form a second accommodating cavity, the magnetic body is arranged in the first accommodating cavity, and the protection tube is arranged in the second accommodating cavity.

6. The air energy water heater of claim 3, wherein, The protection tube abuts against the inner wall surface of the second accommodating cavity.

7. An air energy water heater as claimed in claim 6 wherein, Further comprising a flexible connecting piece connecting the magnetic body and the cover body, the flexible connecting piece being used to constrain the distance between the magnetic body and the base surface from exceeding the second distance.

8. An air energy water heater as claimed in claim 2 wherein, The flexible connecting piece is a volute spring, one end of the volute spring is connected to the inner screw cover, the other end of the volute spring is connected to the magnetic body, and the volute spring is used to make the magnetic body adhere to the protection tube.

9. An air energy water heater as claimed in any one of claims 2 to 8, wherein, A sealing piece is arranged between the outer screw cover and the water tank.

10. An air energy water heater as claimed in claim 1 wherein, The inner screw cover is provided with a first outer thread, the hole wall of the inner cover hole is provided with a first inner thread, the first outer thread and the first inner thread are rotationally combined in a first direction, the outer screw cover is provided with a second outer thread, the hole wall of the outer cover hole is provided with a second inner thread, the second outer thread and the second inner thread are rotationally combined in a second direction, and the directions of the first direction and the second direction are opposite. The magnetic body is externally provided with a protective layer, and the material of the protective layer is polytetrafluoroethylene.

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