Electric water heater

Abstract

The utility model relates to the field of water heaters, and provides an electric water heater. The electric water heater comprises an outer shell, an inner container, a sewage draining plug and a filtering assembly. The inner container is contained in the outer shell, the inner container is provided with a water storage cavity, the inner container is provided with a drain outlet, and the drain outlet is communicated with the water storage cavity; the sewage draining plug is mounted at the sewage draining exit, and the sewage draining plug is used for plugging the sewage draining exit; one end of the filtering assembly is connected with the pollution discharge plug, and the other end of the filtering assembly extends towards the direction of the water storage cavity. The filtering assembly can be soaked in the water storage cavity of the inner container of the electric water heater for a long time, reduction of water inlet flow is avoided, and sufficient release of effective substances of the filtering material is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, in particular to an electric water heater. Background Art

[0002] Water heaters include electric water heaters, solar water heaters and gas water heaters. The electric water heater and the solar water heater include an inner tank for storing water.

[0003] In the related art, a pre-filter filled with a scale inhibitor is usually adopted, so that water first flows through the scale inhibitor in the pre-filter, and the scale inhibitor is carried into the inner tank to prevent the precipitation of calcium and magnesium ions. However, the pre-filter needs to occupy a certain space. At the same time, the time for water to flow through the scale inhibitor is short, it is difficult to fully release the effective substance of the scale inhibitor, the scale inhibition performance is poor, and the water inlet volume will also be reduced. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the related art. For this purpose, the utility model provides an electric water heater, in which the filtering component is immersed in the water storage cavity of the inner tank of the electric water heater for a long time, thereby avoiding the reduction of the water inlet flow rate and ensuring the full release of the effective substances of the filter material.

[0005] According to the electric water heater of the utility model, it includes:

[0006] An outer shell;

[0007] An inner tank, which is received in the outer shell. The inner tank has a water storage cavity, and a sewage outlet is provided on the inner tank, and the sewage outlet is communicated with the water storage cavity;

[0008] A sewage plug, which is installed at the sewage outlet and is used to block the sewage outlet;

[0009] A filtering component, one end of which is connected to the sewage plug, and the other end extends towards the direction of the water storage cavity.

[0010] According to an embodiment of the utility model, the filtering component includes a sleeve and a filter material. The sleeve has a first end and a second end. The first end is fixedly connected to the sewage plug, and the second end is suspended in the water storage cavity. The filter material is arranged in the sleeve, and a plurality of communication ports are provided on the peripheral wall of the sleeve.

[0011] According to an embodiment of the utility model, the filtering component further includes an end cover. The second end has an open end, and the end cover covers the open end.

[0012] According to an embodiment of the utility model, a bayonet is provided on the tube wall of the second end, and an elastic arm extends from one side of the end cover toward the sleeve, and the elastic arm is engaged with the bayonet.

[0013] According to an embodiment of the utility model, the filter material is arranged in a rod shape, and a central hole extending along the central axis direction of the sleeve is provided in the filter material.

[0014] According to one embodiment of the present invention, the diameter of the central hole is greater than or equal to 2.5 mm and less than or equal to 8 mm;

[0015] And / or, the outer diameter of the filter material is greater than or equal to 17 mm and less than or equal to 25 mm.

[0016] According to an embodiment of the utility model, a concave-convex surface is provided on the outer wall surface of the filter material along the central axis direction of the sleeve.

[0017] According to an embodiment of the utility model, the filter material includes at least one of a scale-inhibiting substance, a rare earth element, an antibacterial substance, a residual chlorine-removing substance and a fragrant substance.

[0018] According to an embodiment of the utility model, the filter assembly further comprises a base, the base is fixedly connected to the end of the first end of the sleeve, and the base is connected to the sewage plug.

[0019] According to an embodiment of the utility model, a threaded column is provided on the side of the base facing away from the sleeve, a threaded hole is provided on the side of the drain plug facing the inner tank, and the base and the drain plug are threadedly connected through the threaded column and the threaded hole.

[0020] The above one or more technical solutions in the embodiments of the utility model have at least one of the following technical effects:

[0021] In this application, one end of the filtering component is connected to the sewage plug, and the other end extends towards the water storage cavity, ensuring that the filtering component can be immersed in the water storage cavity of the electric water heater inner tank for a long time. This enables the filtering component to always be in water, continuously filtering and improving the water quality. Whether it is scale inhibitor substances, antibacterial substances or other beneficial substances, they can be stably released through the filter element for a long time, thus effectively improving the water quality. In the traditional design of electric water heaters, if the filtering device is set in the water inlet pipeline, it may have a certain impact on the water flow due to the resistance of the filtering medium, resulting in a decrease in the water inlet flow rate. However, in this design, by directly installing the filtering component at the sewage outlet instead of in the water inlet pipeline, the direct impact on the water inlet flow rate is effectively avoided. When users use the electric water heater, they can enjoy a stable water flow rate while obtaining filtered high-quality water source. Since the filtering component is immersed in the water storage cavity for a long time, this creates favorable conditions for the full release of the effective substances in the filter material. Under the action of factors such as water temperature and pressure, the scale inhibitor substances, antibacterial substances, etc. in the filter material can be released into the water more evenly and continuously, thereby improving the filtering efficiency and the water quality improvement effect.

[0022] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or in related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 is a schematic diagram of the sectional assembly relationship of an embodiment of an electric water heater provided by an embodiment of the present utility model;

[0025] Figure 2 is Figure 1 the structural schematic diagram of the filtering component in

[0026] Figure 3 is Figure 2 the front view of the filtering component in

[0027] Figure 4 is Figure 3 the sectional view at A-A in

[0028] Figure 5 is Figure 4 the enlarged view at A in

[0029] Reference numerals:

[0030] 10. Electric water heater;

[0031] 100. Outer housing;

[0032] 200. Inner tank; 210. Water storage cavity; 220. Drain port;

[0033] 300. Drain plug; 310. Threaded hole;

[0034] 400. Filter assembly; 410. Sleeve; 411. First end; 412. Second end; 412a. Open end; 413. Communication port; 414. Bayonet; 420. Filter media; 421. Central hole; 430. End cap; 431. Spring arm; 440. Base; 441. Threaded post. Detailed implementation mode

[0035] The following further describes in detail the implementation mode of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0036] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific situations.

[0038] In the embodiments of the present utility model, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0039] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0040] The water heater includes an electric water heater, a solar water heater, and a gas water heater. The electric water heater and the solar water heater include an inner tank for storing water.

[0041] In the related art field, a pre-filter equipped with a scale inhibitor is usually adopted, allowing the user's water to first flow through the scale inhibitor in the pre-filter and bring the scale inhibitor into the tank to prevent the precipitation of calcium and magnesium ions. However, the pre-filter needs to occupy a certain space for user use. At the same time, the time for the water to flow through the scale inhibitor is short, making it difficult to fully release the scale inhibitor, resulting in poor scale inhibition performance and also reducing the water inlet volume.

[0042] The present utility model provides an electric water heater.

[0043] In the embodiments of the utility model, with reference to Figures 1 to 2 , the electric water heater 10 includes a housing 100, an inner tank 200, a drain plug 300, and a filter assembly 400. The inner tank 200 is received in the housing 100. The inner tank 200 has a water storage cavity 210. A drain port 220 is provided on the inner tank 200, and the drain port 220 communicates with the water storage cavity 210. The drain plug 300 is installed at the drain port 220, and the drain plug 300 is used to block the drain port 220. One end of the filter assembly 400 is connected to the drain plug 300, and the other end extends towards the direction of the water storage cavity 210.

[0044] The outer casing 100 is the external protective layer of the electric water heater 10, which protects the various components inside the water heater from the external environment, such as dust, moisture, impact, etc. The outer casing 100 is usually made of a strong and insulating material, such as metal or plastic, to ensure its structural strength and safety. In addition, the outer casing 100 also has an aesthetic appearance design, which can blend into different home environments and enhance the overall home style.

[0045] In this application, the inner tank 200 changes the original enamel layer to a polymer, so that the magnesium rod assembly used to protect the enamel inner tank 200 is no longer needed in the inner tank 200. The inner tank 200 is the core component of the electric water heater 10 and is used to store hot water. It has good heat preservation performance and corrosion resistance, ensuring that the hot water can maintain its temperature for a long time and preventing the water quality from being polluted.

[0046] The drain port 220 is an opening in the inner tank 200 for discharging the dirt and impurities accumulated in the inner tank 200. During the use of the inner tank 200, some impurities such as scale and sediment will inevitably accumulate. Through the drain port 220, these impurities can be easily cleaned to keep the inner tank 200 clean.

[0047] The drain plug 300 is used to block the drain port 220 to prevent the water in the inner tank 200 from leaking from the drain port 220. It usually has a tight structure and excellent sealing performance to ensure the sealing and safety of the inner tank 200.

[0048] The filter assembly 400 is a device installed at the drain port 220 for releasing scale inhibitors or other component substances into the water quality in the inner tank 200. It can prevent the precipitation of calcium and magnesium ions and improve the cleanliness and safety of the hot water. The filter assembly 400 is usually made of scale inhibitor materials, such as scale inhibitors, strontium-rich substances, polymer skeleton materials, etc., to ensure the filtering effect and durability.

[0049] The present application connects one end of the filter assembly 400 to the sewage plug 300 and extends the other end toward the water storage chamber 210, thereby ensuring that the filter assembly 400 can be immersed in the water storage chamber 210 of the inner tank 200 of the electric water heater 10 for a long time. The filter assembly 400 is always in the water, and can continuously filter and improve the water quality. Whether it is anti-scaling substances, antibacterial substances or other beneficial substances, they can be released stably for a long time through the filter element, thereby effectively improving the water quality. In the traditional design of the electric water heater 10, if the filter device is set in the water inlet pipeline, the resistance of the filter medium may have a certain impact on the water flow, resulting in a decrease in the water inlet flow rate. However, the present application effectively avoids the direct impact on the water inlet flow rate by directly installing the filter assembly 400 at the sewage outlet 220 instead of in the water inlet pipeline. When using the electric water heater 10, users can enjoy a stable water flow rate while obtaining a high-quality filtered water source. Since the filter assembly 400 is immersed in the water storage chamber 210 for a long time, this creates favorable conditions for the full release of effective substances in the filter material 420. Under the influence of factors such as water temperature and pressure, the scale inhibitors, antibacterial substances, etc. in the filter material 420 can be released into the water more evenly and continuously, thereby improving the filtration efficiency and water quality improvement effect. In contrast, if the filter material 420 is only in contact with water for a short time, it may not be able to fully play its role.

[0050] Reference Figures 2 to 4 According to an embodiment of the utility model, the filter assembly 400 includes a sleeve 410 and a filter material 420. The sleeve 410 has a first end 411 and a second end 412. The first end 411 is connected and fixed to the drain plug 300, and the second end 412 is suspended in the water storage chamber 210. The filter material 420 is arranged in the sleeve 410, and a plurality of communication ports 413 are arranged on the peripheral wall of the sleeve 410. It can be understood that the sleeve 410 has a first end 411 and a second end 412, wherein the first end 411 is connected and fixed to the drain plug 300, and the second end 412 is suspended in the water storage chamber 210. The sleeve 410 is stably installed inside the electric water heater 10, and the filter material 420 can be placed in the water for filtering. The sleeve 410 not only fixes and protects the filter material 420, but also ensures that the filter material 420 can contact sufficient water flow through the suspended design of its second end 412, thereby improving the filtering efficiency. The filter material 420 is arranged in the sleeve 410, and is used to release scale-inhibiting substances or other aromatic substances to the water in the inner tank 200 to improve the impurities, microorganisms or other harmful substances in the inner tank 200 and improve the water quality.

[0051] A plurality of communication ports 413 are provided on the peripheral wall of the sleeve 410. The communication ports 413 allow water to enter the interior of the sleeve 410 and contact the filter media 420. The design of the communication ports 413 enables water to enter evenly from around the sleeve 410, fully contact the filter media 420, and improve the filtration efficiency. At the same time, this also helps to avoid the problem of local rapid wear of the filter media 420 caused by the single direction of water flow.

[0052] Specifically, the number, shape, and arrangement form of the communication ports 413 can be set as required and are not specifically limited herein.

[0053] Optionally, the filter media 420 includes at least one of a scale inhibitor, rare earth elements, antibacterial substances, chlorine-removing substances, and fragrant substances. The filter media 420 is the core part of the filtration assembly 400. Different filtration objectives, such as softening water quality, removing chlorine and heavy metals, etc., can be achieved according to the selected materials.

[0054] Refer to Figure 4 , according to an embodiment of the present invention, the filtration assembly 400 further includes an end cap 430. The second end 412 has an opening 412a, and the end cap 430 covers the opening 412a. It can be understood that the second end 412 of the sleeve 410 is provided with an opening 412a, making the second end 412 open, allowing the filter media 420 to be filled into the interior of the sleeve 410 from the second end 412. The end cap 430 is designed to cover the opening 412a of the second end 412 of the sleeve 410 to form a closed filtration environment. It can ensure that the filter media 420 is completely wrapped inside the sleeve 410, prevent the direct loss of the filter media 420 or displacement due to water flow impact, and ensure the stable filtration work of the filter media 420.

[0055] Refer to FIGS. 2 to Figure 4, according to an embodiment of the present utility model, a bayonet 414 is provided on the tube wall of the second end 412. An elastic arm 431 extends from the side of the end cap 430 facing the sleeve 410, and the elastic arm 431 is snap - connected with the bayonet 414. It can be understood that the bayonet 414 is provided on the tube wall of the second end 412 of the sleeve 410, usually in the form of a groove or notch, and its shape and size match those of the elastic arm 431. The main function of the bayonet 414 is to provide a fixed point so that the elastic arm 431 can be firmly snap - connected to it, thereby realizing the tight connection between the end cap 430 and the sleeve 410. The elastic arm 431 is an elastic component extending from the side of the end cap 430 facing the sleeve 410, usually having a certain degree of curvature and elasticity. The elastic arm 431 can elastically deform to adapt to the shape and size of the bayonet 414 and is fixed in the bayonet 414 by snap - connection. Through the snap - connection setting of the elastic arm 431 and the bayonet 414, users can easily realize the connection between the end cap 430 and the sleeve 410 without using additional tools or complex operation steps. Once the elastic arm 431 is snapped into the bayonet 414, it will tightly fit inside the bayonet 414 due to its own elasticity, ensuring the stable and reliable connection between the end cap 430 and the sleeve 410. When users need to disassemble the end cap 430, they only need to apply a certain force to pop the elastic arm 431 out of the bayonet 414, and the disassembly process can be easily completed.

[0056] Referring to Figure 4 and Figure 5 , according to an embodiment of the present utility model, the filter medium 420 is provided in a rod shape, and a central hole 421 extending along the central axis direction of the sleeve 410 is provided inside the filter medium 420. It can be understood that the filter medium 420 is designed in a rod shape, which is suitable for being placed inside the sleeve 410. Such a shape helps to achieve full contact between the filter medium 420 and the water flow. The rod - shaped filter medium 420 can provide a large surface area, increasing the chance of contact with the water flow, thereby improving the filtration efficiency. In addition, the rod - shaped design also facilitates the replacement and maintenance of the filter medium 420. The setting of the central hole 421 allows more water to pass through the inside of the filter medium 420 instead of just flowing over the outer surface of the filter medium 420. Further increasing the water flow rate and improving the filtration efficiency.

[0057] According to an embodiment of the present utility model, the aperture diameter of the central hole 421 is greater than or equal to 2.5 mm and less than or equal to 8 mm. It can be understood that setting the lower limit of the aperture diameter to 2.5 mm ensures that there is sufficient space inside the filter medium 420 to allow water flow, while avoiding the risk of increased water flow resistance or blockage due to too small an aperture diameter. It can ensure that when water passes through the filter medium 420, it can be fully filtered and maintain a certain flow rate. Setting the upper limit of the aperture diameter to 8 mm is to ensure that the filtration area inside the filter medium 420 is large enough to provide sufficient filtration effect. If the aperture diameter is too large, it may cause the water to pass through the filter medium 420 too smoothly, reducing the effective contact area with the filter medium 420 and lowering the filtration effect. Within this aperture diameter range, the water flow rate can be reasonably balanced. A smaller aperture diameter may lead to increased water flow resistance and reduced flow efficiency; while a larger aperture diameter may cause the water to pass through too quickly, reducing the contact time with the filter medium 420. Therefore, by setting an appropriate aperture diameter range, a high water flow rate can be achieved while ensuring the filtration effect.

[0058] Optionally, the aperture diameter of the central hole 421 can be any one of 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm or 8 mm, etc., and can be set according to needs.

[0059] According to an embodiment of the present utility model, the outer diameter of the filter medium 420 is greater than or equal to 17 mm and less than or equal to 25 mm. It can be understood that setting the lower limit of the outer diameter of the filter medium 420 to 17 mm ensures that the filter medium 420 has sufficient surface area, thereby providing more filtration area and helping to improve the filtration effect. Sufficient surface area means that when water passes through the filter medium 420, it can contact more filter medium 420 particles, thus more effectively removing impurities and harmful substances in the water. Setting the upper limit of the outer diameter to 25 mm is considered because too large an outer diameter may increase the overall size of the filtration component 400, which is not conducive to installation and space utilization. At the same time, too large an outer diameter may also cause uneven water flow distribution, affecting the filtration effect. On the premise of ensuring the filtration effect, by limiting the upper limit of the outer diameter of the filter medium 420, the filtration component 400 can be made more compact and better adapted to the space limitation of the inner tank 200. This is particularly important for small or compact electric water heaters 10, which helps to achieve an efficient filtration function in a limited space.

[0060] Optionally, the outer diameter of the filter medium 420 can be any one of 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm or 25 mm, etc., and can be set according to needs.

[0061] According to an embodiment of the present utility model, the outer wall surface of the filter medium 420 is provided with a concave-convex surface along the central axis direction of the sleeve 410. It can be understood that the design of the concave-convex surface makes the outer wall surface of the filter medium 420 no longer smooth, but has multiple protruding and recessed parts. These concave-convex structures increase the contact area between the filter medium 420 and the water flow, enabling more water flow to come into contact with the surface of the filter medium 420, thereby improving the material release effect of the filter medium 420. The presence of the concave-convex surface enables the water flow to be more evenly distributed when passing through the filter medium 420. The protruding parts can guide the water flow towards the recessed parts, causing the water flow to form a more complex flow path on the surface of the filter medium 420, reducing the dead corners of the water flow, and improving the filtration efficiency. The design of the concave-convex surface increases the structural strength of the filter medium 420 to a certain extent. The protruding parts can disperse the impact force of the water flow on the filter medium 420, reducing the risk of damage to the filter medium 420 due to uneven stress.

[0062] Certainly, in other embodiments, by adjusting the size of the central hole 421 diameter of the rod-shaped filter medium 420, or controlling the surface roughness of the rod-shaped filter medium 420, or adding a concave-convex surface to the surface of the rod-shaped filter medium 420 and other means, the release rate of the active ingredients of the rod-shaped filter medium 420 can be controlled. Compared with the granular filter medium 420 being immersed in the storage water heater 10 for a long time, the problem of low service life of the filter medium 420 caused by excessive release of active substances can be avoided.

[0063] Refer to Figures 2 to 5 Referring to

[0064] Refer to Figures 2 to 5, according to an embodiment of the present utility model, a threaded post 441 is provided on the side of the base 440 facing away from the sleeve 410, and a threaded hole 310 is provided on the side of the sewage plug 300 facing the inner tank 200. The base 440 and the sewage plug 300 are threadedly connected through the threaded post 441 and the threaded hole 310. It can be understood that through the tight combination of the threaded post 441 and the threaded hole 310, the connection between the base 440 and the sewage plug 300 is more stable and not easily loosened. To be applicable to scenarios that need to withstand a certain water pressure or impact force, ensuring the long-term use stability of the filter assembly 400. The design of the threaded post 441 and the threaded hole 310 makes the installation process more intuitive and simple. The user only needs to align the threaded post 441 with the threaded hole 310 and then rotate the sewage plug 300 to complete the installation. This design reduces the tools and steps required for installation and improves the installation efficiency. Through the tight fit of the threaded post 441 and the threaded hole 310, a good sealing effect is formed between the sewage plug 300 and the base 440. This helps prevent water or other liquids from leaking from the connection, ensuring the cleanliness and hygiene inside the inner tank 200.

[0065] The electric water heater 10 of the present application may further include a heating part, a control part, etc. Among them, the heating part is mainly composed of a heating tube or a heating wire, which is responsible for converting electrical energy into heat energy to heat water. This part is usually made of high-quality materials to ensure high heating efficiency, safety and reliability. The control part includes a temperature controller, a circuit board, etc., which are responsible for controlling parameters such as the heating temperature and working time of the electric water heater 10 to ensure the normal operation of the electric water heater 10. The electric water heater 10 is usually equipped with a variety of safety protection devices, such as an anti-electricity wall, a leakage protection switch, an over-temperature protection, etc., to ensure the use safety. The electric water heater 10 may also include some other accessories, such as a water inlet pipe, a water outlet pipe, a sewage outlet 220, etc., to facilitate the installation, use and maintenance of the user.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the present utility model, rather than to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present utility model do not depart from the spirit and scope of the technical solutions of the present utility model, and should all be covered by the scope of the claims of the present utility model.

Claims

1. An electric water heater, characterized in that: include: outer shell; An inner liner, the inner liner is accommodated in the outer shell, the inner liner has a water storage cavity, the inner liner is provided with a sewage outlet, and the sewage outlet is communicated with the water storage cavity; A sewage plug, which is installed at the sewage outlet and is used to seal the sewage outlet; A filter assembly, one end of which is connected to the sewage plug, and the other end of which is extended toward the water storage cavity.

2. The electric water heater according to claim 1, characterized in that: The filter assembly includes a sleeve and filter material, the sleeve has a first end and a second end, the first end is connected and fixed to the sewage plug, and the second end is suspended in the water storage cavity, the filter material is arranged in the sleeve, and a plurality of communication ports are arranged on the peripheral wall of the sleeve.

3. The electric water heater according to claim 2, characterized in that: The filter assembly further includes an end cap, the second end has an opening, and the end cap covers the opening.

4. The electric water heater according to claim 3, characterized in that: A bayonet is provided on the tube wall of the second end, and an elastic arm extends from one side of the end cover toward the sleeve, and the elastic arm is engaged with the bayonet.

5. The electric water heater according to any one of claims 2 to 4, characterized in that: The filter material is arranged in a rod shape, and a central hole extending along the central axis direction of the sleeve is arranged in the filter material.

6. The electric water heater according to claim 5, characterized in that: The diameter of the central hole is greater than or equal to 2.5 mm and less than or equal to 8 mm; and / or, The outer diameter of the filter material is greater than or equal to 17 mm and less than or equal to 25 mm.

7. The electric water heater according to claim 5, characterized in that: The outer wall surface of the filter material is provided with a concave-convex surface along the central axis direction of the sleeve.

8. The electric water heater according to any one of claims 2 to 4, characterized in that: The filter assembly also includes a base, the base is fixedly connected to the end of the first end of the sleeve, and the base is connected to the sewage plug.

9. The electric water heater according to claim 8, characterized in that: A threaded column is arranged on the side of the base facing away from the sleeve, a threaded hole is arranged on the side of the drain plug facing the inner tank, and the base and the drain plug are threadedly connected via the threaded column and the threaded hole.

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