Water heater

Abstract

The utility model provides a water heater which comprises an electric heating piece, the electric heating piece is provided with a first side and a second side, the first side and the second side are oppositely arranged, a water inlet is formed in the first side, a water outlet is formed in the second side, the water inlet is connected with a water inlet pipeline, and a water flow sensor is arranged on the water inlet pipeline. The water outlet is connected with a water outlet pipeline; and a magnetizer for magnetizing water is arranged on the water outlet pipeline. According to the water heater, the water flow sensor is arranged on the water inlet pipeline connected with the water inlet of the electric heating piece, and the magnetizer for magnetizing water is arranged on the water outlet pipeline connected with the water outlet of the electric heating piece, so that on one hand, the magnetizer is independent of the electric heating piece, and when the magnetizer breaks down, the magnetizer is convenient to maintain and replace; on the other hand, the magnetizer and the water flow sensor are located on the two opposite sides of the electric heating piece respectively, the magnetizer is prevented from affecting a Hall element in the water flow sensor, and therefore the problem that the precision of the water flow sensor is affected is avoided.

Description

Technical Field

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

[0002] In order to sterilize water, some water heaters are provided with a magnetizer for magnetizing water quality. Among the current solutions for providing a magnetizer on a water heater, some of them are provided in the pipeline inside the electric heating element. When the magnetizer fails, it is difficult to repair and replace. Some of them are provided on the water inlet pipeline connected to the electric heating element. Since a water flow sensor is provided on the water inlet pipeline, the magnetizer is provided on the same side as the water flow sensor and is too close to the water flow sensor, which will affect the Hall element in the water flow sensor, thereby causing a problem of affecting the accuracy of the water flow sensor. Utility Model Content

[0003] In order to at least partially solve the problems existing in the prior art, according to one aspect of the utility model, a water heater is provided, and the technical solution is as follows.

[0004] The water heater includes an electric heating element, which has a first side and a second side. The first side is arranged opposite to the second side. A water inlet is arranged on the first side, and a water outlet is arranged on the second side. The water inlet is connected to a water inlet pipeline, and a water flow sensor is arranged on the water inlet pipeline. The water outlet is connected to a water outlet pipeline, and a magnetizer for magnetizing water quality is arranged on the water outlet pipeline.

[0005] In the water heater of the utility model, the water flow sensor is arranged on the water inlet pipe connected to the water inlet of the electric heating element, and the magnetizer for magnetizing the water quality is arranged on the water outlet pipe connected to the water outlet of the electric heating element. On the one hand, the magnetizer is arranged independently of the electric heating element, and when the magnetizer fails, it is convenient to repair and replace; on the other hand, the magnetizer and the water flow sensor are respectively located on the opposite sides of the electric heating element, so that the magnetizer is prevented from affecting the Hall element in the water flow sensor, thereby avoiding the problem of affecting the accuracy of the water flow sensor.

[0006] Exemplarily, the magnetizer and the water flow sensor have a spacing H1 in the first direction, H1 ≥ 100 mm, and the first direction is the length direction of the electric heating element. When the magnetizer and the water flow sensor meet this spacing range, the influence of the magnetizer on the Hall element in the water flow sensor can be effectively avoided, thereby avoiding the problem of affecting the accuracy of the water flow sensor.

[0007] Exemplarily, the water heater further comprises a first shell and a second shell, the first shell and the second shell are covered to form a receiving cavity, the electric heating element is arranged in the receiving cavity, and a power board is arranged on the second shell, and the power board is electrically connected to the electric heating element through a wire. The arrangement of the first shell and the second shell can not only support the electric heating element, but also facilitate the arrangement of the power board and other structural parts; furthermore, the power board can control the electric heating element to work or stop, and can control the temperature of the water heated by the electric heating element, thereby protecting the safety of the water heater.

[0008] Exemplarily, a negative ion generating assembly is provided on the second shell, and the negative ion generating assembly includes a negative ion power supply board, a negative ion generator and a discharge electrode, the negative ion power supply board is electrically connected to the power supply board through a wire, the negative ion generator is electrically connected to the negative ion power supply board through a wire, and the discharge electrode is electrically connected to the negative ion generator through a wire. In this way, the water heater is provided with an electric heating element, a magnetizer and a negative ion generator, which enriches the function of the water heater, so that the water heater can not only heat water and purify water quality, but also purify air and eliminate smoke.

[0009] Exemplarily, the discharge electrode has a discharge segment extending through the second shell and outside the accommodating cavity. In this arrangement, the free electrons generated by the discharge segment can directly contact the external air, which is conducive to purifying the air, and compared with the case where the discharge segment is arranged in the accommodating cavity, when purifying the air, there is no need to use a fan to discharge the adsorbed matter out of the accommodating cavity, thereby reducing costs.

[0010] Exemplarily, the length of the discharge segment is D, D≤2 mm, so as to avoid the operator accidentally touching the discharge segment due to its excessive length, thereby increasing the safety of use.

[0011] Exemplarily, the second housing is provided with a plurality of through holes, and the discharge segment extends out of the accommodating cavity through one of the through holes. In this way, the discharge segment can pass through the through hole and directly contact the air, which is not only conducive to heat dissipation, but also facilitates the arrangement of the discharge segment, making the structure simpler.

[0012] Exemplarily, the water inlet pipeline has a pipeline joint, and in the first direction, the discharge electrode is arranged higher than the pipeline joint. Such arrangement prevents the pipeline joint from leaking and affecting the discharge effect of the discharge electrode.

[0013] Exemplarily, compared with the first side and the second side, the negative ion power board and the power board are both arranged closer to the first side. In this way, on the one hand, the negative ion power board and the power board are both arranged closer to the first side, so that the negative ion power board and the power board are both closer to the water inlet pipeline, and the temperature near the water inlet pipeline is lower, which avoids the high temperature from affecting the operation of the negative ion power board and the power board; on the other hand, the negative ion power board and the power board are arranged on the same side, so that the length of the wire required to be arranged between the negative ion power board and the power board is shorter, which is convenient for wiring.

[0014] For example, a display panel is provided on the first housing, and the display panel is connected to the power panel via a wire. The display panel can display the water temperature, and the user can adjust the temperature accurately according to the display panel, thereby improving the user experience.

[0015] Exemplarily, the discharge electrode and the display panel have a safety distance H in the second direction, H≥40mm, and the second direction is the thickness direction of the electric heating element. When the discharge electrode and the display panel meet the range of the safety distance in the second direction, the discharge electrode is prevented from affecting the display panel.

[0016] For example, the second shell is provided with a first connecting hole and a second connecting hole, the water inlet pipe extends from the water inlet through the first connecting hole to the outside of the accommodating cavity, and the water outlet pipe extends from the water outlet through the second connecting hole to the outside of the accommodating cavity. This arrangement facilitates the connection of the water inlet pipe with the external pipe, and facilitates the connection of the water outlet pipe with the external pipe.

[0017] A series of simplified concepts are introduced in the utility model content, which will be further described in detail in the detailed implementation section. The utility model content section does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0018] The advantages and features of the present invention are described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following drawings of the present invention are used as part of the present invention for understanding the present invention. The drawings show the implementation of the present invention and its description, and are used to explain the principle of the present invention. In the drawings,

[0020] Figure 1 A three-dimensional water heater of an exemplary embodiment of the utility model Figure 1 ;

[0021] Figure 2 for Figure 1 The three-dimensional water heater shown Figure 2 ;

[0022] Figure 3 for Figure 1 The water heater shown is a front view with the first shell removed;

[0023] Figure 4 for Figure 1 a rear view of the second housing of the water heater;

[0024] Figure 5 for Figure 1 a rear view of the water heater shown;

[0025] Figure 6 for Figure 5 AA section view in;

[0026] Figure 7 for Figure 6 Enlarged view of part A in FIG.

[0027] The above drawings include the following reference numerals:

[0028] 10. water heater; 110. electric heating element; 111. first side; 101. water flow sensor; 1111. water inlet; 112. second side; 1121. water outlet; 113. water inlet pipeline; 1131. pipeline joint; 114. water outlet pipeline; 120. magnetizer; 130. first shell; 131. glass plate; 132. display board; 140. second shell; 141. first connecting hole; 142. second connecting hole; 150. accommodating chamber; 160. power board; 170. negative ion generating assembly; 171. negative ion power board; 172. negative ion generator; 173. discharge electrode; 1731. discharge segment; 180. through hole; 191. thyristor board; 192. zero sequence mutual inductor; 193. thermal circuit breaker; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0029] In the following description, a large number of details are provided so that the present invention can be thoroughly understood. However, it will be appreciated by those skilled in the art that the following description only illustrates preferred embodiments of the present invention, and the present invention can be implemented without one or more of such details. In addition, in order to avoid confusion with the present invention, some technical features known in the art are not described in detail.

[0030] In order to thoroughly understand the implementation of the utility model, a detailed structure will be presented in the following description. Obviously, the implementation of the utility model is not limited to the specific details familiar to those skilled in the art. The preferred implementation of the utility model is described in detail below, but in addition to these detailed descriptions, the utility model can also have other implementations.

[0031] The embodiment of the utility model provides a water heater. The water heater can be used in a variety of scenarios, including but not limited to being used in home, office and other scenarios. The following will introduce a water heater according to the embodiment of the utility model in detail with reference to the accompanying drawings.

[0032] Combined with reference Figure 1 and Figure 3, the water heater 10 may include an electric heating element 110. The electric heating element 110 may have a first side 111 and a second side 112. The first side 111 and the second side 112 may be arranged opposite to each other. A water inlet 1111 may be arranged on the first side 111. A water outlet 1121 may be arranged on the second side 112. The water inlet 1111 may be connected to a water inlet pipeline 113. A water flow sensor 101 may be arranged on the water inlet pipeline 113. The water outlet 1121 may be connected to a water outlet pipeline 114. A magnetizer 120 for magnetizing water quality may be arranged on the water outlet pipeline 114.

[0033] In the water heater 10 of the utility model, the water flow sensor 101 is arranged on the water inlet pipe 113 connected to the water inlet 1111 of the electric heating element 110, and the magnetizer 120 for magnetizing water quality is arranged on the water outlet pipe 114 connected to the water outlet 1121 of the electric heating element 110. On the one hand, the magnetizer 120 is arranged independently of the electric heating element 110, and when the magnetizer 120 fails, it is convenient to repair and replace; on the other hand, the magnetizer 120 and the water flow sensor 101 are respectively located on the opposite sides of the electric heating element 110, so that the magnetizer 120 avoids affecting the Hall element in the water flow sensor 101, thereby avoiding the problem of affecting the accuracy of the water flow sensor 101.

[0034] The principle of magnetizing water quality by magnetizer 120 is that when water cuts the magnetic lines vertically, water will generate electrical energy, which will be converted into the internal energy of water. Under the action of this internal energy, the large molecular cluster water formed by 16 to 30 water molecules will be transformed into small molecular cluster water formed by 3 to 5 water molecules. In addition, the genetic genes of bacteria in the water are also completely destroyed. Under normal circumstances, the chlorine in water exists as free chlorine, which is highly active and easily generates trichloromethane and haloacetic acid with organic matter in water, but does not react chemically with water. After being treated with a strong magnetic field, chlorine and water are activated, and chlorine and water react to generate hydrochloric acid and hypochlorous acid. Hypochlorous acid is unstable at room temperature and decomposes into hydrochloric acid and new ecological oxygen. This new ecological oxygen has a very strong oxidizing effect, which can thoroughly sterilize and disinfect in water. After hydrochloric acid is ionized, chloride ions and hydrogen ions are generated. Chlorine ions are very easy to combine with metal ions such as potassium, sodium, calcium, and magnesium in water to generate potassium salts, sodium salts, calcium salts, and magnesium salts that are harmless to the human body.

[0035] In one embodiment of the present invention, refer again to Figure 1 and Figure 3, the magnetizer 120 and the water flow sensor 101 may have a spacing H1 in the first direction X, H1 ≥ 100mm. The first direction X may be the length direction of the electric heating element 110. H1 may vary according to the size of the electric water heater 10. The minimum value of H1 is 100mm. When the size of the electric water heater 10 is small, H1 may be as small as 100mm. When the magnetizer 120 and the water flow sensor 101 meet this spacing range, the influence of the magnetizer 120 on the Hall element in the water flow sensor 101 can be effectively avoided, thereby avoiding the problem of affecting the accuracy of the water flow sensor 101. It can be understood that the larger the spacing H1 between the magnetizer 120 and the water flow sensor 101 in the first direction X, the smaller the influence of the magnetizer 120 on the accuracy of the water flow sensor 101.

[0036] In one embodiment of the present utility model, in conjunction with reference to Figures 1 to 6 The water heater 10 may further include a first shell 130 and a second shell 140. The first shell 130 and the second shell 140 may be covered to form an accommodating chamber 150. The electric heating element 110 may be arranged in the accommodating chamber 150. A power board 160 may be arranged on the second shell 140. The power board 160 may be electrically connected to the electric heating element 110 through a wire. The first shell 130 and the second shell 140 are arranged, which can not only support the electric heating element 110, but also facilitate the arrangement of the power board 160 and other structural parts; furthermore, through the power board 160, the electric heating element 110 can be controlled to work or stop, and the temperature of the water heated by the electric heating element 110 can be controlled, thereby protecting the safety of the water heater 10. When in use, the first shell 130 may face the user, and the second shell 140 may be installed on the wall. A glass plate 131 may be arranged on the first shell 130, and the glass plate 131 may be covered on the power board 160, so that the user can observe the status of the power board 160.

[0037] In one embodiment of the present utility model, in conjunction with reference to Figure 2 and Figure 3 , a negative ion generating assembly 170 may be provided on the second shell 140. The negative ion generating assembly 170 may include a negative ion power supply board 171, a negative ion generator 172 and a discharge electrode 173. The negative ion power supply board 171 may be electrically connected to the power supply board 160 via a wire. The negative ion generator 172 may be electrically connected to the negative ion power supply board 171 via a wire. The discharge electrode 173 may be electrically connected to the negative ion generator 172 via a wire. In this way, the water heater 10 is provided with an electric heating element 110, a magnetizer 120 and a negative ion generator 172, which enriches the function of the water heater 10, so that the water heater 10 can not only heat water and purify water quality, but also purify air and eliminate smoke.

[0038] In one embodiment of the present utility model, in conjunction with reference to Figure 6 and Figure 7 The discharge electrode 173 may have a discharge segment 1731 extending through the second shell 140 and out of the accommodating chamber 150. In this way, the free electrons generated by the discharge segment 1731 can directly contact the external air, which is beneficial to purifying the air. Compared with the case where the discharge segment 1731 is arranged in the accommodating chamber 150, when purifying the air, there is no need to use a fan to discharge the adsorbed matter out of the accommodating chamber 150, thereby reducing the cost.

[0039] In one embodiment of the present invention, again in conjunction with reference to Figure 6 and Figure 7 , the length of the discharge segment 1731 can be D, D≤2mm. The minimum value of D is 2mm. Avoiding the discharge segment 1731 being too long and causing the operator to touch it by mistake increases the safety of use. D can have a good discharge effect within this range, and avoid the discharge segment 1731 from touching the wall when the second shell 140 is installed on the wall due to the length exceeding 2mm, thereby affecting the discharge effect.

[0040] In one embodiment of the present utility model, in conjunction with reference to Figure 3 , Figure 6 and Figure 7 The second housing 140 may be provided with a plurality of through holes 180. The discharge segment 1731 may pass through one of the through holes 180 and extend out of the accommodating cavity 150. In this way, the discharge segment 1731 may pass through the through hole 180 and directly contact the air, which is not only conducive to heat dissipation, but also conducive to the arrangement of the discharge segment 1731, making the structure simpler.

[0041] Combined with reference Figure 3 and Figure 7 The working process of the negative ion generating assembly 170 is described in detail below. The power board 160 supplies power to the negative ion power board 171, and the negative ion power board 171 inputs direct current or alternating current to the negative ion generator 172. The direct current or alternating current is processed by the rectifier circuit, boost circuit, filter circuit, etc. of the negative ion generator 172 to obtain pure direct current negative high voltage. The negative ion generator 172 inputs the direct current negative high voltage to the discharge electrode 173, and discharges through the discharge segment 1731 of the discharge electrode 173. The direct current high voltage of the discharge segment 1731 is used to generate high corona, and a large number of electrons (e-) are released at a high speed. Electrons cannot exist in the air for a long time and will be immediately captured by oxygen molecules (O2) in the air, thereby generating air negative ions. The negative ions will adsorb larger suspended matter in the air, causing the suspended matter to attract each other and finally fall to the ground, thereby achieving the effect of purifying the air.

[0042] In one embodiment of the present invention, refer to Figure 3The water inlet pipe 113 may have a pipe joint 1131. In the first direction X, the discharge electrode 173 may be arranged higher than the pipe joint 1131. Such an arrangement can prevent the pipe joint 1131 from leaking and affecting the discharge effect of the discharge electrode 173.

[0043] In one embodiment of the present invention, refer again to Figure 3 , compared with the first side 111 and the second side 112, the negative ion power board 171 and the power board 160 can be arranged closer to the first side 111. In this way, on the one hand, the negative ion power board 171 and the power board 160 are arranged closer to the first side 111, and the negative ion power board 171 and the power board 160 are closer to the water inlet pipe 113, and the temperature near the water inlet pipe 113 is relatively low, which prevents the high temperature from affecting the operation of the negative ion power board 171 and the power board 160; on the other hand, the negative ion power board 171 and the power board 160 are arranged on the same side, so that the length of the wire required to be arranged between the negative ion power board 171 and the power board 160 is relatively short, which is convenient for wiring.

[0044] In one embodiment of the present utility model, in conjunction with reference to Figure 3 and Figure 4 A display panel 132 may be provided on the first housing 130. The display panel 132 may be connected to the power board 160 via a wire. The display panel 132 may display the water temperature, and the user may adjust the temperature accurately according to the display panel 132, thereby improving the user's experience.

[0045] In one embodiment of the present invention, refer to Figure 6 , the discharge electrode 173 and the display panel 132 may have a safety distance H in the second direction Y, H ≥ 40 mm. It is understandable that the minimum value of H is 40 mm. The second direction Y may be the thickness direction of the electric heating element 110. When the discharge electrode 173 and the display panel 132 meet the range of this safety distance in the second direction Y, the discharge electrode 173 is prevented from affecting the display panel 132. If H is less than 40 mm, the free electrons generated by the discharge electrode 173 will adhere to the display panel 132, and when there is static electricity, the display panel 132 may be broken down by the free electrons.

[0046] In one embodiment of the present utility model, in conjunction with reference to Figure 3 and Figure 6 , the second housing 140 may be provided with a first communication hole 141 and a second communication hole 142. The water inlet pipe 113 may extend from the water inlet 1111 through the first communication hole 141 to the outside of the accommodating chamber 150. The water outlet pipe 114 may extend from the water outlet 1121 through the second communication hole 142 to the outside of the accommodating chamber 150. Such a configuration facilitates the connection of the water inlet pipe 113 with an external pipe, and facilitates the connection of the water outlet pipe 114 with an external pipe.

[0047] In one embodiment of the present invention, refer again to Figure 3 , a thyristor board 191, a zero-sequence mutual inductor 192 and a thermal circuit breaker 193 may also be provided on the second housing 140. The thyristor board 191 may be electrically connected to the electric heating element 110 through a wire. The thyristor board 191 may be connected to control the electric heating element 110, and adjust the output power in real time, so as to achieve constant temperature water outlet at the end. The zero-sequence mutual inductor 192 may be electrically connected to the power supply board 160 through a wire, and the zero-sequence mutual inductor 192 may be sleeved outside the neutral line and the live line. The zero-sequence mutual inductor 192 is mainly used to protect and monitor the circuit. For example, when a circuit leaks electricity, the zero-sequence mutual inductor 192 will output current, cut off the power supply or issue an alarm measure, and detect whether the inlet and outlet currents of the live line (in) and the neutral line (out) are balanced. When the deviation value reaches 25±5mA, it indicates that a large leakage has occurred, and an automatic alarm is issued. One end of the thermal circuit breaker 193 can be connected to the neutral line and the live line, and the other end of the thermal circuit breaker 193 can be electrically connected to the power board 160 through a wire. The thermal circuit breaker 193 is a dry-burning protection device. When the water heater 10 is dry-burned, when the surface of the electric heating element 110 exceeds the disconnection temperature point of the thermal circuit breaker 193, the thermal circuit breaker 193 is instantly actuated to cut off the circuit, thereby preventing the water heater 10 from being damaged by dry-burning. In this way, by providing the thyristor board 191, the zero-sequence mutual inductor 192 and the thermal circuit breaker 193, the safety of the circuit of the water heater 10 is enhanced.

[0048] In summary, the working process of the water heater 10 is described in detail. After the power supply is connected, the circuit in the water heater 10 works, and the display panel 132, the electric heating element 110 and the negative ion generator 172 start working. The user can operate and control through the display panel 132. Low-temperature water enters the electric heating element 110 through the water inlet pipe 113, and becomes hot water after being heated by the electric heating element 110. The hot water enters the water outlet pipe 114, flows through the magnetizer 120 to purify the water quality, and high-quality hot water flows out from the water outlet pipe 114. The free electrons generated by the negative ion generator 172 are captured by oxygen molecules in the air and combined into negative ions. The negative ions adsorb suspended matter and purify the air.

[0049] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "vertical", "horizontal", "top", "bottom", etc. are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention; the directional words "inside" and "outside" refer to the inside and outside relative to the contours of each component itself.

[0050] For ease of description, regional relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the regional positional relationship between one or more components or features shown in the figure and other components or features. It should be understood that regional relative terms include not only the orientation of the components as described in the figure, but also different orientations in use or operation. For example, if the components in the accompanying drawings are inverted as a whole, the components "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Therefore, the exemplary term "above" may include both "above" and "below". In addition, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this article is intended to include all of these situations.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, parts, components and / or combinations thereof.

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0053] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model. The protection scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A water heater, characterized in that: The invention comprises an electric heating element, wherein the electric heating element has a first side and a second side, the first side is arranged opposite to the second side, a water inlet is arranged on the first side, a water outlet is arranged on the second side, the water inlet is connected to a water inlet pipeline, a water flow sensor is arranged on the water inlet pipeline, the water outlet is connected to a water outlet pipeline, a magnetizer for magnetizing water quality is arranged on the water outlet pipeline.

2. The water heater according to claim 1, characterized in that: The magnetizer and the water flow sensor have a distance H1 in a first direction, where H1≥100 mm. The first direction is the length direction of the electric heating element.

3. The water heater according to claim 1, characterized in that: The water heater also includes a first shell and a second shell. The first shell and the second shell are covered to form a receiving cavity. The electric heating element is arranged in the receiving cavity. A power board is arranged on the second shell. The power board is electrically connected to the electric heating element through a wire.

4. The water heater according to claim 3, characterized in that: A negative ion generating component is arranged on the second shell, and the negative ion generating component includes a negative ion power supply board, a negative ion generator and a discharge electrode. The negative ion power supply board is electrically connected to the power supply board through a wire, the negative ion generator is electrically connected to the negative ion power supply board through a wire, and the discharge electrode is electrically connected to the negative ion generator through a wire.

5. The water heater according to claim 4, characterized in that: The discharge electrode has a discharge segment extending through the second shell and extending outside the accommodating cavity.

6. The water heater according to claim 5, characterized in that: The length of the discharge section is D, where D≤2 mm.

7. The water heater according to claim 5, characterized in that: The second shell is provided with a plurality of through holes, and the discharge segment extends out of the accommodating cavity through one of the through holes.

8. The water heater according to claim 4, characterized in that: The water inlet pipeline has a pipeline joint, and in a first direction, the discharge electrode is arranged higher than the pipeline joint.

9. The water heater according to claim 4, characterized in that: Compared with the first side and the second side, the negative ion power supply plate and the power supply plate are both arranged closer to the first side.

10. The water heater according to claim 4, characterized in that: The first shell is provided with a display panel, and the display panel is connected to the power supply panel through a wire.

11. The water heater according to claim 10, characterized in that The discharge electrode and the display panel have a safety distance H in the second direction, H≥40 mm, and the second direction is the thickness direction of the electric heating element.

12. The water heater according to claim 3, characterized in that: The second shell is provided with a first connecting hole and a second connecting hole, the water inlet pipe extends from the water inlet through the first connecting hole to the outside of the accommodating cavity, and the water outlet pipe extends from the water outlet through the second connecting hole to the outside of the accommodating cavity.

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