Electric water heater

Abstract

A water containing cavity is formed in an inner container, a heating pipe is located in the water containing cavity and used for heating water in the water containing cavity, a water inlet pipe is used for supplying water to the water containing cavity, and a water outlet pipe is used for allowing the water in the water containing cavity to flow out. The liquid level sensor comprises a magnetic ring and a magnetic induction device, the water outlet pipe is sleeved with the magnetic ring, the magnetic ring moves up and down along the water outlet pipe under the action of water buoyancy, the movement upper limit position of the magnetic ring is higher than the height upper limit position of the heating pipe, and the magnetic induction device is arranged on the outer wall of the inner container and right faces the position above the magnetic ring. According to the scheme, the liquid level sensor can be installed without forming holes in the inner container or the flange plate, machining and installation are convenient, production efficiency is improved, and reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of electric water heaters, in particular to an electric water heater capable of preventing an inner tank from being dry-burned. Background Art

[0002] The electric water heater includes an outer shell, an inner tank, a water inlet pipe, a water outlet pipe, a heating pipe, etc. Specifically, a flange is arranged on one end of the inner tank, and the heating pipe is arranged on the flange. The heating pipe is used to heat the water in the inner tank. The water inlet pipe and the water outlet pipe can be arranged at the bottom of the inner tank or on the flange on the side.

[0003] During the use of the electric water heater, if the liquid level in the inner tank is lower than the heating tube, dry burning is likely to occur, and in severe cases, the inner tank may burn. Therefore, it is necessary to detect the liquid level in the inner tank to determine whether the liquid level in the inner tank is higher than the height of the heating tube, thereby preventing dry burning.

[0004] In the prior art, a liquid level sensor is used to detect the liquid level in the inner tank. During processing and production, a hole needs to be opened on the inner tank or the flange to install the liquid level sensor. At the same time, a sealing treatment needs to be performed at the position of the hole, which is inconvenient to process and has low production efficiency.

[0005] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] In view of the problems pointed out in the background technology, the utility model provides an electric water heater, in which the installation of the liquid level sensor does not require drilling holes on the inner tank or the flange, which is easy to process and install, improves production efficiency, and has high reliability.

[0007] In order to achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions:

[0008] The utility model provides an electric water heater, comprising:

[0009] An inner tank, wherein a water-containing cavity is formed;

[0010] A heating pipe, located in the water holding chamber and used for heating the water in the water holding chamber;

[0011] A water inlet pipe, used for supplying water to the water holding chamber;

[0012] A water outlet pipe, used for allowing the water in the water storage chamber to flow out;

[0013] The liquid level sensor comprises a magnetic ring and a magnetic sensing device, wherein the magnetic ring is sleeved on the water outlet pipe, and the magnetic ring moves up and down along the water outlet pipe under the action of water buoyancy, and the upper limit of the movement of the magnetic ring is higher than the upper limit of the height of the heating tube, and the magnetic sensing device is arranged on the outer wall of the inner tank, just above the magnetic ring.

[0014] In some embodiments, an upper limit portion and a lower limit portion are provided on the outer peripheral wall of the water outlet pipe at intervals along its height direction, and the magnetic ring moves up and down between the upper limit portion and the lower limit portion.

[0015] In some embodiments, the upper limit portion is close to the top water outlet position of the water outlet pipe.

[0016] In some embodiments, the distance between the upper limit portion and the lower limit portion is less than 10 cm.

[0017] In some embodiments, the magnetic sensing device is adhered to the outer wall of the inner container.

[0018] In some embodiments, the water inlet pipe and the water outlet pipe extend upward from the bottom of the inner tank into the water storage cavity;

[0019] Alternatively, a flange is provided on one end side of the inner tank along its horizontal length direction, and the water inlet pipe and the water outlet pipe extend from the flange into the water storage cavity.

[0020] In some embodiments, a filter is further included, which is arranged on the water inlet pipe. The filter includes a shell, a filter element is arranged in the inner cavity of the shell, a water inlet, a clean water outlet, and a sewage outlet are provided on the shell, and a gap is provided between the filter element and the inner circumferential wall of the shell. A protrusion structure is provided on the inner circumferential wall of the shell, and the protrusion structure is used to disturb the water flow flowing into the gap.

[0021] In some embodiments, an internal component is disposed in the inner cavity of the shell, a water flow gap is formed between the internal component and the inner peripheral wall of the shell, the filter element is disposed in the inner cavity of the internal component, a plurality of spaced through holes are disposed on the peripheral wall of the internal component, water flows from the water inlet into the water flow gap, and flows into the inner cavity of the internal component through the through holes.

[0022] In some embodiments, the built-in component is a hollow cylindrical structure with open ends, and protrusions are respectively provided on the outer peripheral walls of the opposite ends of the built-in component, and the protrusions are sealed against the inner peripheral wall of the shell;

[0023] The first end of the built-in component abuts against the inner end wall of the first end of the shell, and the sewage outlet is arranged on the end wall of the first end of the shell;

[0024] There is a distance between the second end of the built-in component and the inner end wall of the second end of the shell, and the clean water outlet is arranged on the end wall of the second end of the shell;

[0025] One end of the filter element is connected to the second end of the built-in component, and the water inlet is arranged on the peripheral wall of the shell and communicated with the gap between the built-in component and the shell.

[0026] In some embodiments, the built-in component is provided with a through opening, and the through opening is arranged close to the first end of the built-in component, and the dirt in the gap enters the inner cavity of the built-in component through the through opening and is then discharged from the sewage outlet.

[0027] Compared with the prior art, the advantages and positive effects of the utility model are:

[0028] In the electric water heater disclosed in the present application, the liquid level sensor includes a magnetic ring and a magnetic sensing device. The magnetic ring is sleeved on the water outlet pipe, and the magnetic sensing device is fixed to the outer wall of the inner tank by gluing. The installation of the magnetic ring and the magnetic sensing device does not require opening holes in the inner tank or the flange as in the prior art, nor does it require corresponding water sealing treatment, which facilitates production and processing and improves production efficiency.

[0029] When the liquid level in the inner tank is higher than the low position of the magnetic ring, the magnetic ring floats up under the action of water buoyancy, and the distance between the magnetic ring and the top magnetic sensing device gradually decreases until the magnetic sensing device senses the magnetic ring, indicating that there is sufficient water in the inner tank. At this time, the liquid level is higher than the upper limit of the heating tube, and dry burning will definitely not occur.

[0030] When the liquid level in the inner pot is low, lower than the magnetic ring, the magnetic ring cannot float up. At this time, the distance between the magnetic ring and the magnetic sensing device exceeds the sensing range of the magnetic sensing device. The magnetic sensing device cannot sense it, indicating that the inner pot is short of water. At this time, there is a risk of dry burning.

[0031] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 is one of the structural schematic diagrams of the electric water heater according to the embodiment;

[0034] Figure 2This is a second structural schematic diagram of an electric water heater according to an embodiment;

[0035] Figure 3 is a partial structural schematic diagram of a magnetic ring and a water outlet pipe according to an embodiment;

[0036] Figure 4 is a schematic structural diagram of a magnetic ring in a low position according to an embodiment;

[0037] Figure 5 is a schematic structural diagram of a magnetic ring in a high position after floating according to an embodiment;

[0038] Figure 6 is a schematic structural diagram of a filter according to an embodiment;

[0039] Figure 7 is a cross-sectional view of a filter according to an embodiment;

[0040] Figure 8 for Figure 7 Enlarged view of part A in the middle;

[0041] Fig. 9 is a schematic structural diagram of a built-in component according to an embodiment;

[0042] Fig.10 is a schematic diagram of a water path of an electric water heater and a filter according to an embodiment;

[0043] Reference numerals:

[0044] 100, electric water heater; 110, water inlet pipe; 120, water outlet pipe; 121, upper limit portion; 122, lower limit portion; 130, flange; 140, heating tube; 141, upper limit position of the height of the heating tube; 150, inner tank; 151, water storage chamber;

[0045] 200, liquid level sensor; 210, magnetic ring; 220, magnetic sensing device;

[0046] 300, filter; 310, housing; 311, water inlet; 312, clean water outlet; 313, sewage outlet; 314, first housing; 315, second housing; 320, filter element; 330, built-in component; 331, through hole; 332, raised portion; 333, through port; 334, gap;

[0047] 410, first solenoid valve; 420, second solenoid valve. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0054] This embodiment discloses an electric water heater, referring to Figure 1 or Figure 2 The liquid level sensor 200 includes an inner tank 150, a flange 130, a water inlet pipe 110, a water outlet pipe 120, a heating pipe 140, a liquid level sensor 200 and the like.

[0055] The inner tank 150 has a water chamber 151 formed therein, and a flange 130 is disposed on one end of the inner tank 150 in the horizontal length direction. The water inlet pipe 110 is used to supply water to the water chamber 151, and the water outlet pipe 120 is used to allow the water in the water chamber 151 to flow out. The heating pipe 140 is connected to the flange 130, and the heating pipe 140 is located in the water chamber 151 and is used to heat the water in the water chamber 151.

[0056] Tap water flows into the water chamber 151 through the water inlet pipe 110, and the heating pipe 140 heats the water in the water chamber 151. The heated hot water flows out from the water outlet pipe 120 to provide water of the required temperature to the user.

[0057] During the heating process of the electric water heater 100, it is necessary to ensure that the liquid level in the water storage chamber 151 is higher than the heating tube 140, otherwise dry burning will occur, and in severe cases, the inner tank 150 will burn.

[0058] The electric water heater in this embodiment detects the liquid level in the water storage chamber 151 through the liquid level sensor 200, so as to prevent the electric water heater from drying out and improve the safety of the electric water heater.

[0059] Specifically, the liquid level sensor 200 includes a magnetic ring 210 and a magnetic sensing device 220. Figure 3 The magnetic ring 210 is sleeved on the water outlet pipe 120. The magnetic ring 210 moves up and down along the water outlet pipe 120 under the action of water buoyancy. The upper limit of the movement of the magnetic ring 210 is higher than the upper limit of the height of the heating tube 140. The magnetic sensing device 220 is arranged on the outer wall of the inner tank 150, just above the magnetic ring 210.

[0060] Figure 4 The schematic diagram of the magnetic ring 210 when it is in the low position is shown. Figure 5 It is a schematic diagram showing the magnetic ring 210 floating to a high position under the action of water buoyancy.

[0061] When the liquid level in the inner tank 150 is higher than the low position of the magnetic ring 210, the magnetic ring 210 floats up under the action of water buoyancy, and the distance between the magnetic ring 210 and the top magnetic sensing device 220 gradually decreases until the magnetic sensing device 220 senses the magnetic ring, indicating that there is sufficient water in the inner tank 150. At this time, the liquid level is higher than the upper limit position 141 of the heating tube, and dry burning will definitely not occur.

[0062] When the liquid level in the inner pot 150 is low, lower than the magnetic ring 210, the magnetic ring 210 cannot float up. At this time, the distance between the magnetic ring 210 and the magnetic sensing device 220 exceeds the sensing range of the magnetic sensing device 220. The magnetic sensing device 220 cannot sense, indicating that the inner pot 150 is short of water. At this time, there is a risk of dry burning.

[0063] The magnetic ring 210 is sleeved on the water outlet pipe 120, and the magnetic sensing device 220 is fixed to the outer wall of the inner tank 150 by gluing. The installation of the magnetic ring 210 and the magnetic sensing device 220 does not require drilling holes in the inner tank or the flange as in the prior art, nor does it require corresponding water sealing treatment, which facilitates production and processing and improves production efficiency.

[0064] In some embodiments, reference Figure 3 An upper limit portion 121 and a lower limit portion 122 are provided on the outer peripheral wall of the water outlet pipe 120 at intervals along its height direction, and the magnetic ring 210 moves up and down between the upper limit portion 121 and the lower limit portion 122 .

[0065] The upper limit portion 121 is used to limit the upward movement position of the magnetic ring 210, and the lower limit portion 122 is used to limit the downward movement position of the magnetic ring 210. The upper limit portion 121 and the lower limit portion 122 play a role in limiting the movement of the magnetic ring 210.

[0066] Furthermore, the upper limit portion 121 is close to the top water outlet position of the water outlet pipe 120, so that the floating high position of the magnetic ring 210 is close to the top of the water outlet pipe 120, thereby improving the accuracy of liquid level detection to prevent the inner tank 150 from drying out.

[0067] Furthermore, the distance between the upper limit portion 121 and the lower limit portion 122 is less than 10 cm, which further improves the accuracy of liquid level detection.

[0068] In some embodiments, the magnetic sensing device 220 is adhered to the outer wall of the inner liner 150 for easy installation. There is no need to drill holes in the inner liner 150 or the flange 130 to install the sensor, which facilitates production and processing.

[0069] exist Figure 1In the electric water heater shown, the water inlet pipe 110 and the water outlet pipe 120 extend upward from the bottom of the inner tank 150 into the water storage chamber 151. The heating pipe 140 bends downward and extends from the flange 130 to the inner side of the water storage chamber 151. The installation position of the heating pipe 140 on the flange 130 is the upper limit position 510 of the height of the heating pipe 140. The water inlet pipe 110 and the water outlet pipe 120 are both straight pipe structures, and the magnetic ring 210 is arranged near the top of the water outlet pipe 120.

[0070] exist Figure 2 In the electric water heater shown in FIG. Figure 1 The difference between the electric water heater shown is that the water inlet pipe 110 and the water outlet pipe 120 extend from the flange 130 into the water storage chamber 151. The heating pipe 140 bends downward and extends from the flange 130 to the inner side of the water storage chamber 151, and the installation position of the heating pipe 140 on the flange 130 is the upper limit position 510 of the height of the heating pipe 140. The water inlet pipe 110 is a straight pipe structure, and the water outlet pipe 120 is a curved pipe structure. The top of the water outlet pipe 120 has a straight pipe section, and the magnetic ring 210 is arranged on the straight pipe section.

[0071] In some embodiments, reference Fig.10 The electric water heater further includes a filter 300 , which is disposed on the water inlet pipe 110 . The filter 300 is used to filter impurities in the water. The water filtered by the filter 300 flows into the electric water heater 100 .

[0072] The filter 300 includes a housing 310 and a filter element 320, and the filter element 320 is disposed in the inner cavity of the housing 310. In this specific embodiment, the filter 300 is an ultra-micro filter, and the filter element 320 is an ultra-micro filtration membrane.

[0073] The filtration accuracy of the ultra-microfiltration membrane is between 0.01-10um, which can intercept and remove suspended matter, colloids, particles, bacteria, viruses and other macromolecular substances in the water. The ultra-microfiltration membrane can remove most pollutants in tap water except ions, so the water filtered by the ultra-microfiltration membrane is suitable for domestic use.

[0074] However, after long-term use, a large amount of pollutants are easily attached to the surface of the ultra-microfiltration membrane, causing a decrease in flow rate and affecting the user experience. Therefore, the filter needs to be cleaned regularly.

[0075] Reference Figure 6 and Figure 7The shell 310 is provided with a water inlet 311, a clean water outlet 312, and a sewage outlet 313. The clean water outlet 312 and the sewage outlet 313 are arranged opposite to each other along the length direction of the shell 310. The water inlet 311 is arranged on the circumferential side wall of the shell 310 and is close to the clean water outlet 312. The clean water outlet 312 is connected to the water inlet of the electric heater through a connecting pipe. A first solenoid valve 410 is arranged on the sewage pipeline connected to the sewage outlet 313 to control the on-off of the sewage pipeline. A second solenoid valve 420 is arranged on the water inlet pipeline connected to the water inlet 311 to control the on-off of the water inlet pipeline.

[0076] The housing 310 includes a first housing 314 and a second housing 315. The first housing 314 and the second housing 315 are connected to form an inner cavity for installing the filter element 320. Figure 7 For example, the water inlet 311 is provided on the circumferential side wall of the first housing 314, the sewage outlet 313 is provided at the end of the first housing 314, and the clean water outlet 312 is provided at the end of the second housing 315. One end of the filter element 320 is at a certain distance from the end where the sewage outlet 313 is located, and the other end of the filter element 320 is at a certain distance from the end where the clean water outlet 312 is located. One end of the filter element 320 close to the clean water outlet 312 is sealed against the inner circumferential wall of the first housing 314, and there is a gap between the filter element 320 and the inner circumferential wall of the first housing 314.

[0077] A protrusion structure (not shown) is disposed on the inner peripheral wall of the first shell 314 , and the protrusion structure is used to disturb the water flow into the gap.

[0078] When the electric water heater is in normal use, the filter 300 device executes the filtering mode, the sewage outlet 313 is closed, and water flows into the inner cavity of the shell 310 through the water inlet 311, flows out from the clean water outlet 312 after being filtered by the filter element 320, and flows into the electric water heater 100 for heating to provide users with water of the required temperature.

[0079] When the filter 300 filters tap water, the protruding structure disturbs the water flow in the inner cavity of the filter 300, which helps to reduce the adhesion of pollutants on the surface of the membrane filaments of the ultra-microfiltration membrane and delay the contamination of the membrane filaments.

[0080] When the filter 300 needs to be cleaned, the filter 300 device performs a forward flushing mode, water enters the inner cavity of the housing 310, flushes the filter element 320, and then is discharged from the sewage outlet 313. After the water enters the inner cavity of the housing 310, the convex structure can increase the disturbance of the water flow, which helps the pollutants to leave the surface of the filter element 320, thereby improving the cleaning effect of the filter element 320.

[0081] In some embodiments, the inner cavity of the housing 310 is provided with an internal component 330, referring to Figures 7 to 9A water flow gap 334 is formed between the built-in component 330 and the inner peripheral wall of the housing 310 (specifically the first housing 314 ), the filter element 320 is disposed in the inner cavity of the built-in component 330 , and a plurality of through holes 331 arranged at intervals are disposed on the peripheral wall of the built-in component 330 .

[0082] When the electric water heater is in normal use, tap water flows from the water inlet 311 into the water flow gap 334 between the built-in component 330 and the first shell 314. The multiple through holes 331 on the built-in component 330 play a role in flow equalization. The tap water flows into the space where the filter element 320 is located through the through holes 331. At this time, the through holes 331 help to increase the turbulence effect, which can reduce the adhesion of pollutants on the membrane fibers of the ultrafiltration membrane and delay the contamination of the membrane fibers.

[0083] When the filter element 320 inside the filter 300 is forwardly flushed, tap water flows from the water inlet 311 into the water flow gap 334 between the built-in component 330 and the first shell 314. The multiple through holes 331 on the built-in component 330 play a role in flow equalization. The tap water flows into the space where the filter element 320 is located through the through holes 331. At this time, the flushing water flow impacts and shakes the membrane fibers from all directions, which helps the pollutants to fall off the filter element 320 and improves the flushing effect of the filter element 320.

[0084] In some embodiments, protrusions 332 are respectively provided on the outer peripheral walls of the opposite ends of the built-in component 330, and the protrusions 332 are sealed against the inner peripheral wall of the housing 310 (specifically, the first housing 314). The first end of the built-in component 330 is against the inner end wall of the first end of the housing 310, and the end wall of the first end of the housing 310 is provided with a sewage outlet 313. There is a distance between the second end of the built-in component 330 and the inner end wall of the second end of the housing 310, and the end wall of the second end of the housing 310 is provided with a clean water outlet 312.

[0085] One end of the filter element 320 is connected to the second end of the built-in component 330, and the water inlet 311 is provided on the peripheral wall of the housing 310 and communicates with the gap 334 between the built-in component 330 and the housing 310. Tap water or gas flows into the gap 334 between the built-in component 330 and the first housing 314, and flows into the interior of the built-in component 330 through the through hole 331 on the built-in component 330.

[0086] In some embodiments, a through opening 333 is provided on the inner component 330 , and the through opening 333 is arranged near the first end of the inner component 330 . Dirt in the gap 334 enters the inner cavity of the inner component 330 through the through opening 333 and is then discharged from the sewage outlet 313 .

[0087] If there are larger-sized particulate pollutants in the tap water flowing into the water inlet pipe of the filter 300 through the water inlet 311, these pollutants will accumulate in the gap 334 between the built-in component 330 and the shell 310, which will affect the water flow over time. Due to the setting of the through port 333, during positive flushing, the pollutants in the gap 334 can flow into the inner cavity of the built-in component 330 from the through port 333. Since the through port 333 is set close to the sewage outlet 313, these pollutants are directly discharged from the sewage outlet 313 under the action of the water flow.

[0088] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0089] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions that can be easily thought of by technicians familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An electric water heater, comprising: An inner tank, wherein a water-containing cavity is formed; A heating pipe, located in the water holding chamber and used for heating the water in the water holding chamber; A water inlet pipe, used for supplying water to the water holding chamber; A water outlet pipe, used for allowing the water in the water storage chamber to flow out; It is characterized by further comprising: The liquid level sensor comprises a magnetic ring and a magnetic sensing device, wherein the magnetic ring is sleeved on the water outlet pipe, and the magnetic ring moves up and down along the water outlet pipe under the action of water buoyancy, and the upper limit of the movement of the magnetic ring is higher than the upper limit of the height of the heating tube, and the magnetic sensing device is arranged on the outer wall of the inner tank, just above the magnetic ring.

2. The electric water heater according to claim 1, characterized in that: An upper limit portion and a lower limit portion are provided on the outer peripheral wall of the water outlet pipe at intervals along the height direction thereof, and the magnetic ring moves up and down between the upper limit portion and the lower limit portion.

3. The electric water heater according to claim 2, characterized in that: The upper limit portion is close to the top water outlet position of the water outlet pipe.

4. The electric water heater according to claim 2, characterized in that: The distance between the upper limit portion and the lower limit portion is less than 10 cm.

5. The electric water heater according to claim 1, characterized in that: The magnetic induction device is adhered to the outer wall of the inner container.

6. The electric water heater according to any one of claims 1 to 5, characterized in that: The water inlet pipe and the water outlet pipe extend upward from the bottom of the inner container into the water storage cavity; Alternatively, a flange is provided on one end side of the inner tank along its horizontal length direction, and the water inlet pipe and the water outlet pipe extend from the flange into the water storage cavity.

7. The electric water heater according to any one of claims 1 to 5, characterized in that: It also includes a filter, which is arranged on the water inlet pipe. The filter includes a shell, a filter element is arranged in the inner cavity of the shell, a water inlet, a clean water outlet, and a sewage outlet are arranged on the shell, a gap is provided between the filter element and the inner circumferential wall of the shell, and a protrusion structure is arranged on the inner circumferential wall of the shell, and the protrusion structure is used to disturb the water flow flowing into the gap.

8. The electric water heater according to claim 7, characterized in that: An internal component is arranged in the inner cavity of the shell, a water flow gap is formed between the internal component and the inner peripheral wall of the shell, the filter element is arranged in the inner cavity of the internal component, and a plurality of through holes arranged at intervals are arranged on the peripheral wall of the internal component, water flows into the water flow gap from the water inlet, and flows into the inner cavity of the internal component through the through holes.

9. The electric water heater according to claim 8, characterized in that: The built-in component is a hollow cylindrical structure with open ends. The outer peripheral walls at the opposite ends of the built-in component are respectively provided with raised parts, and the raised parts are abutted and sealed against the inner peripheral wall of the shell; The first end of the built-in component abuts against the inner end wall of the first end of the shell, and the sewage outlet is arranged on the end wall of the first end of the shell; There is a distance between the second end of the built-in component and the inner end wall of the second end of the shell, and the clean water outlet is arranged on the end wall of the second end of the shell; One end of the filter element is connected to the second end of the built-in component, and the water inlet is arranged on the peripheral wall of the shell and communicated with the gap between the built-in component and the shell.

10. The electric water heater according to claim 9, characterized in that: The built-in component is provided with a through opening, which is arranged close to the first end of the built-in component. Dirt in the gap enters the inner cavity of the built-in component through the through opening and is then discharged from the sewage outlet.

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