Electric water heater with potential corrosion prevention function

Abstract

The utility model discloses an electric water heater with a potential corrosion prevention function, which comprises a shell, a water inlet pipe and a water outlet pipe are arranged on the shell, and an electric control board is further arranged in the shell; the inner container is respectively communicated with the water inlet pipe and the water outlet pipe; the electric heating device is arranged in the inner container; the water inlet pipe and the water outlet pipe adopt an anti-potential corrosion pipe group, the anti-potential corrosion pipe group comprises an inner pipe body, an insulating fixing piece and an external pipe body, a communicating hole is formed in the insulating fixing piece, the inner pipe body is connected with the external pipe body through the insulating fixing piece, the inner pipe body is communicated with the external pipe body through the communicating hole, and the inner pipe body and the external pipe body are insulated and isolated; the insulation fixing piece is arranged on the inner container, the inner pipe body is located in the inner container, and the outer pipe body is located outside the inner container. The electric water heater is integrated with the potential corrosion prevention water pipe, so that the use reliability of the electric water heater is improved, and the service life of the electric water heater is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of household appliances, and in particular relates to an electric water heater with an anti-potential corrosion function. Background Art

[0002] At present, water heaters are commonly used household appliances in people's daily lives. Electric water heaters can be divided into storage type electric water heaters and instant electric water heaters according to the size of heating power. Storage type electric water heaters are equipped with a water tank, which has the characteristics of large water output and stable water temperature, and are purchased and used by more families.

[0003] A conventional electric water heater typically consists of an outer shell, an inner tank, an electric heating tube, and a magnesium rod. The inner tank is equipped with a water inlet and outlet pipes. The electric heating tube and magnesium rod are inserted into the inner tank, which is located in the outer shell. When in use, water is poured into the inner tank and the electric heating tube is powered to heat the water to a set temperature. When the user uses water, the water inlet pipe injects cold water into the inner tank, and hot water is discharged through the outlet pipe.

[0004] Because one end of the water inlet and outlet pipes is exposed outside the inner tank, while the other end is located inside the inner tank, conventional water inlet and outlet pipes are usually made of iron, while the water pipes connected to the user's home are generally copper pipes. This creates a potential difference at the point of contact between the copper and iron pipes. Under the influence of this potential difference, after prolonged use, the pipe connection is prone to potential corrosion, resulting in water leakage, which in turn reduces the reliability of the electric water heater and shortens its service life. In view of this, how to design a technology to improve the reliability of electric water heaters and extend their service life is the technical problem to be solved by this utility model. Utility Model Content

[0005] The utility model provides an electric water heater with an anti-potential corrosion function, which enables the electric water heater to be integrated with a water pipe with an anti-potential corrosion function, thereby improving the reliability of the electric water heater and extending the service life of the electric water heater.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] In one aspect, the present invention provides an electric water heater with an anti-potential corrosion function, comprising:

[0008] A housing, wherein a water inlet pipe and a water outlet pipe are provided on the housing, and an electric control panel is also provided in the housing;

[0009] An inner liner, the inner liner being connected to the water inlet pipe and the water outlet pipe respectively;

[0010] An electric heating device, the electric heating device being arranged in the inner container;

[0011] The water inlet pipe and the water outlet pipe adopt an anti-potential corrosion pipe group, which includes an inner pipe body, an insulating fixing piece and an external pipe body. The insulating fixing piece is provided with a connecting hole, and the inner pipe body is connected to the external pipe body through the insulating fixing piece. The inner pipe body is connected to the external pipe body through the connecting hole, and the inner pipe body and the external pipe body are insulated and isolated; the insulating fixing piece is provided on the inner liner, the inner pipe body is located in the inner liner, and the external pipe body is located outside the inner liner and is configured to be the same metal material as the water pipe connected to the outside.

[0012] By using a pipe group with anti-potential corrosion function for the water inlet pipe and the water outlet pipe, the anti-potential corrosion pipe group separates the inner pipe body and the external pipe body through insulating fixings and fixes them together. During assembly, the pipe group is fixedly installed on the inner tank through the insulating fixings. At this time, the inner pipe body is located in the inner tank, and the external pipe body is located outside the inner tank. The inner pipe body and the external pipe body are insulated and separated by the insulating fixings, so that the inner pipe body will not produce potential corrosion inside the inner tank. At the same time, the external pipe body can be made of the same metal material as the pipe body in the user's home. After the external pipe body is connected to the water pipe in the user's home, galvanic corrosion caused by direct contact between dissimilar metals can be avoided, thereby improving the reliability of use and extending the service life of the electric water heater.

[0013] At the same time, since the inner pipe body and the outer pipe body are directly connected together and fixed on the inner tank through insulating fixings, they have good anti-leakage performance at the factory stage, thereby avoiding leakage of the anti-potential corrosion pipe group itself when installing the connecting pipe in the user's home, reducing the workload of on-site installers and reducing problems such as installation leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0015] Figure 1 This is a structural schematic diagram of an embodiment of an electric water heater of the present invention;

[0016] Figure 2 This is a second structural diagram of an electric water heater embodiment of the present invention;

[0017] Figure 3 for Figure 2 Cross-sectional view of a medium-sized electric water heater;

[0018] Figure 4 for Figure 2 Schematic diagram of the structure of the anti-corrosion component;

[0019] Figure 5 for Figure 4 One of the cross-sectional views of the corrosion-resistant components;

[0020] Figure 6 for Figure 5 A local enlarged schematic diagram of the middle N region;

[0021] Figure 7 for Figure 1 Schematic diagram of the partial structure of the electric water heater;

[0022] Figure 8 for Figure 7 Assembly diagram of the middle end cover and the electric control board;

[0023] Figure 9 for Figure 8 A partial enlarged schematic diagram of area B in the middle;

[0024] Figure 10 for Figure 8 Schematic diagram of the structure of the middle end cover;

[0025] Figure 11 for Figure 10 A partial enlarged schematic diagram of the middle C area;

[0026] Figure 12 for Figure 8 Structural diagram of the fixed installation parts;

[0027] Figure 13 for Figure 1 Explosion diagram of the Zhongdian water heater (part 2);

[0028] Figure 14 for Figure 13 A partial enlarged schematic diagram of the middle M region;

[0029] Figure 15 for Figure 13 Exploded view of the housing assembly;

[0030] Figure 16 for Figure 4 One of the cross-sectional views of the corrosion-resistant components;

[0031] Figure 17 for Figure 4 One of the cross-sectional views of the corrosion-resistant components;

[0032] Figure 18 for Figure 2 The utility model is a cross-sectional view of the water inlet pipe. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] An electric water heater uses electricity as its main energy source. The high-temperature heat generated after power is turned on directly heats the water stored in the electric water heater to achieve the purpose of preparing hot water.

[0035] An electric water heater usually consists of a water tank, an electric heating component, and an electric control board. A water storage cavity is formed in the water tank to store the water to be heated. The electric heating component is inserted into the water storage cavity formed by the water tank. The electric control board is used to control the on and off operation of the electric heating component so that the water in the water tank is heated to the set temperature.

[0036] The water tank of an electric water heater generally consists of an outer shell and an inner tank, with an insulation layer between the outer shell and the inner tank. The outer shell is usually made of plastic to meet the requirements of aesthetic and diverse design. The inner tank can be made of metal or plastic depending on the needs.

[0037] In addition, the insulation layer formed between the outer shell and the inner liner is made of commonly used insulation materials such as asbestos, sponge, foam plastic, polyurethane foam, etc. In conventional technology, in order to obtain a good insulation effect, the insulation layer is usually formed by foaming.

[0038] Among them, for the inner tank with a metal body, the interior of the inner tank is prone to corrosion due to the influence of water quality. For this reason, a magnesium rod is also configured on the water tank, and the magnesium rod is inserted into the water storage cavity inside the water tank.

[0039] Because magnesium has the lowest potential in the electrochemical series and is physiologically non-toxic, it is ideal for use as a magnesium rod to protect the inner liner. The size of the magnesium rod directly affects the duration and effectiveness of the protective effect. The larger the magnesium rod, the better the protection and the longer the protection lasts.

[0040] The water tank is also provided with a water inlet pipe and a water outlet pipe. The water inlet pipe is used to deliver cold water to the water storage cavity formed in the water tank, while the hot water in the water storage cavity is output from the water outlet pipe.

[0041] For the electric heating component, electric heating methods such as electric heating wire, magnetic energy or silicon tube heating can be used to heat the water stored in the water storage cavity.

[0042] As for the electric control board, it is used to receive detection signals sent by relevant sensors (such as water temperature sensor, flow sensor), and at the same time, control the power on and off operation of the electric heating component.

[0043] When the electric water heater is working, the electric control board controls the electric heating component to be powered on for heating. When the water temperature in the water tank reaches the set value, the electric control board controls the electric heating component to be powered off.

[0044] Example 1, refer to Figures 1-16 As shown, an embodiment of the present application provides an electric water heater, including: a shell 100, an inner tank 200, and an electric heating device 300.

[0045] The outer shell 100 further includes an electric control board 123, an inner liner 200, and an electric heating device 300. The inner liner 200 includes a water inlet pipe 210 and a water outlet pipe 220.

[0046] In order to solve the problem of galvanic corrosion caused by direct contact of dissimilar metals, anti-potential corrosion pipe groups are used for both the water inlet pipe and the water outlet pipe, and the water inlet pipe 210 is used as an example for explanation. Figure 18 As shown, the water inlet pipe 210 includes an inner tube body 211, an insulating fixing 212 and an external tube body 213. The insulating fixing 212 is provided with a connecting hole 2121. The inner tube body 211 is connected to the external tube body 213 through the insulating fixing 212. The inner tube body 211 is connected to the external tube body 213 through the connecting hole 2121. The inner tube body 211 and the external tube body 213 are insulated and isolated; the insulating fixing 212 is provided on the inner tank, the inner tube body 211 is located in the inner tank, and the external tube body 213 is located outside the inner tank and is configured to be the same metal material as the water pipe connected to the outside.

[0047] Specifically, the water inlet pipe 210 is an anti-corrosion pipe assembly, the portion located inside the inner tank is the inner pipe body 211, and the portion located outside the inner tank for connecting to the user's home water pipe is the outer pipe body 213. The water inlet pipe is fixed to the inner tank by an insulating fixing 212.

[0048] In actual use, after the electric water heater is installed in a user's home, the user's water supply pipe and water inlet pipe need to be connected. At this time, the water inlet pipe is connected to the user's water supply pipe via the external pipe body 213. The metal material of the external pipe body 213 is generally the same metal material as the user's water supply pipe. This way, after the water supply pipe and external pipe body 213 are connected together, because they are made of the same metal material, the problem of galvanic corrosion caused by direct contact between dissimilar metals is avoided.

[0049] In one embodiment, an auxiliary connecting piece 214 is further provided on the insulating fixing piece 212. The auxiliary connecting piece 214 is a sleeve structure and is sleeved on the outside of the inner tube body 211. The inner wall of the auxiliary connecting piece 214 is provided with an internal thread. The auxiliary connecting piece 214 is insulated and isolated from the inner tube body 211.

[0050] Specifically, to facilitate the operator's secure connection of the insulating fixture 212 to the inner liner during assembly, an auxiliary connector 214 is provided on the insulating fixture 212. The auxiliary connector 214 is generally made of metal to securely connect to the inner liner. Furthermore, to prevent galvanic corrosion caused by dissimilar metal contact, the auxiliary connector 214 is insulated from the inner tube 211 by the insulating fixture 212. Furthermore, the insulating fixture 212 is provided with a spacer structure 2122, which is located between the inner tube 211 and the auxiliary connector 214.

[0051] In another embodiment, in order to improve the sealing performance of the anti-potential corrosion pipe group itself, the external pipe body 213 and the auxiliary connecting piece 214 are embedded in the insulating fixing piece 212 .

[0052] Specifically, the insulating fixing part 212 is generally made of plastic material. During the injection molding process of the insulating fixing part 212, the external tube body 213 and the auxiliary connecting part 214 are placed in the mold for manufacturing the insulating fixing part 212. Then, when the insulating fixing part 212 completes the injection molding process, the external tube body 213 and the auxiliary connecting part 214 are embedded in the insulating fixing part 212.

[0053] In another embodiment, in order to facilitate the sealing assembly of the inner tube body 211, the communicating hole 2121 is a stepped hole structure, and a step surface is formed in the communicating hole 2121. The inner tube body 211 is inserted into the communicating hole 2121 and rests on the step surface.

[0054] Specifically, during the process of assembling the inner tube body 211 , the operator seals and inserts the inner tube body 211 into the communicating hole 2121 , and the end of the inner tube body 211 abuts against the step surface for positioning and installation.

[0055] By using a pipe group with anti-potential corrosion function for the water inlet pipe and the water outlet pipe, the anti-potential corrosion pipe group separates the inner pipe body 211 and the external pipe body 213 through the insulating fixing piece 212 and fixes them together. During assembly, the pipe group is fixedly installed on the inner tank through the insulating fixing piece 212. At this time, the inner pipe body 211 is located in the inner tank, and the external pipe body 213 is located outside the inner tank. The inner pipe body 211 and the external pipe body 213 are insulated and separated by the insulating fixing piece 212, so that the inner pipe body 211 will not produce potential corrosion inside the inner tank. At the same time, the external pipe body 213 can be made of the same metal material as the pipe body in the user's home. After the external pipe body 213 is connected to the water pipe in the user's home, galvanic corrosion caused by direct contact between dissimilar metals can be avoided, thereby improving the reliability of use and extending the service life of the electric water heater.

[0056] At the same time, since the inner tube body 211 and the outer tube body 213 are directly connected together and fixed on the inner tank through the insulating fixing piece 212, they have good anti-leakage performance at the factory stage, thereby avoiding leakage of the anti-potential corrosion pipe group itself when installing the connecting pipe in the user's home, reducing the workload of on-site installers and reducing problems such as installation leakage.

[0057] In another embodiment of the present application, in order to further reduce galvanic corrosion of components in the electric water heater caused by direct contact of dissimilar metals, the following improved design may be performed.

[0058] Specifically, in order to reduce corrosion inside the inner tank 200, the electric water heater also includes an anti-corrosion component 250, which includes: a magnesium rod 251. In order to reduce galvanic corrosion of the magnesium rod 251 caused by direct contact between dissimilar metals, the anti-corrosion component 250 is structurally improved and designed as follows.

[0059] One end of the magnesium rod 251 is provided with a socket; the anti-corrosion component 250 further includes: an insulating component 252, a fixed installation component 253 and a conductive rod 254.

[0060] The insulating component 252 is provided with a first through hole, and the fixed installation component 253 is provided with a second through hole. The fixed installation component 253 is configured to be fixedly installed on the inner tank of the water heater; the conductive rod 254 passes through the second through hole and the first through hole in sequence and is inserted into the socket, and the conductive rod 254 is conductively connected to the magnesium rod 251; the insulating component 252 is arranged between the magnesium rod 251 and the fixed installation component 253.

[0061] Specifically, when installing the anti-corrosion assembly 250, the magnesium rod 251 is inserted into the inner liner 200, and the fixed installation component 253 is fixedly connected to the inner liner to support the magnesium rod 251 inside the inner liner 200. The electric control board is electrically connected to the electric heating device and the conductive rod 254 of the anti-corrosion assembly 250 respectively.

[0062] During use, the inner liner 200 is filled with water, and the magnesium rod 251 is immersed in the water in the inner liner 200. However, since the magnesium rod 251 is separated from the fixed installation component 253 by the insulating component 252, the part of the magnesium rod 251 that contacts the water does not directly contact the fixed installation component 253, but is separated by the insulating component 252. In this way, during use, galvanic corrosion caused by direct contact between the dissimilar metals magnesium and the iron fixed installation component 253 in water can be avoided.

[0063] Among them, Figure 1 As shown, the electric water heater can be a single tank with a counterweight, or, as Figure 3 As shown, the electric water heater can be configured with multiple inner tanks.

[0064] In one embodiment, the insulating component 252 may be an independent component, or may be directly formed by injection molding on the magnesium rod 251 or the fixed installation component 253 .

[0065] like Figure 5 As shown, the insulating component 252 is formed on the fixing and mounting component 253 by injection molding.

[0066] Since the conductive rod 254 needs to be inserted into the socket of the magnesium rod 251, in order to prevent water from entering the connection portion between the magnesium rod 251 and the insulating component 252 and causing galvanic corrosion between the magnesium rod 251 and the conductive rod 254, a sealing ring 255 is further provided between the insulating component 252 and the magnesium rod 251.

[0067] Specifically, a sealing ring 255 is provided between the insulating component 252 and the magnesium rod 251 to seal the two, thereby ensuring that during long-term use, water in the inner tank will not penetrate into the connection between the conductive rod 254 and the magnesium rod 251, further improving the reliability of use.

[0068] In some embodiments, a retaining ring 2541 is provided on the conductive rod 254 ; the retaining ring is abutted against the end of the magnesium rod 251 and is clamped between the sealing ring 255 and the magnesium rod 251 .

[0069] Specifically, when inserting the conductive rod 254 , in order to facilitate the operator to accurately assemble, a retaining ring is provided on the conductive rod 254 , and the retaining ring is used to limit the assembly position between the conductive rod 254 and the magnesium rod 251 .

[0070] Or, as Figure 17 As shown, the insulating component 252 is injection-molded on the magnesium rod. At this time, a sealing ring 255 is provided between the fixing and mounting component 253 and the insulating component 252.

[0071] Or, as Figure 16 As shown, the insulating component 252 is an independent component. In this case, a sealing ring 255 is provided between the fixing component 253 and the insulating component 252 , and a sealing ring 255 is also provided between the magnesium rod 251 and the insulating component 252 .

[0072] In another embodiment, an insulating coating 2542 is further provided on the rod wall of the conductive rod 254 , the insulating coating is adjacent to the retaining ring, and the portion of the conductive rod 254 with the insulating coating is inserted into the insertion hole.

[0073] Specifically, since the magnesium rod 251 needs to be provided with a socket to mount the conductive rod 254, the thickness of the portion of the magnesium rod 251 where the socket is formed is relatively small. During use, as the magnesium rod 251 is worn out, the portion of the magnesium rod 251 where the conductive rod 254 is mounted will gradually wear out, exposing the conductive rod 254. However, the insulating coating 2542 provided on the wall of the conductive rod 254 prevents direct contact between the conductive rod 254 and the magnesium rod 251, thereby preventing galvanic corrosion.

[0074] In order to ensure that the conductive rod 254 and the magnesium rod 251 can maintain a conductive state, the insulating coating 2542 is not applied to the end surface of the conductive rod 254, so that the end surface of the conductive rod 254 and the magnesium rod 251 are in contact for conduction. In addition, at least the surface of the retaining ring that contacts the magnesium rod 251 is also provided with the insulating coating.

[0075] In another embodiment, a wiring terminal 256 is further provided at the end of the conductive rod 254 extending out of the fixed installation component 253 .

[0076] Specifically, in order to facilitate the wiring between the conductive rod 254 and the electric control board, a wiring terminal can be provided on the conductive rod 254, and the wiring terminal is convenient for connecting the wire to the electric control board.

[0077] In certain embodiments, to facilitate assembly, the outer circumference of the fixing member 253 is provided with external threads, and the fixing member 253 is threadedly connected to the inner container via the external threads. The outer circumference of the end of the conductive rod 254 extending outside the fixing member 253 is also provided with external threads to facilitate securing the terminal to the end of the conductive rod 254 via a nut.

[0078] In another embodiment of the present application, in order to detect the consumption rate of the magnesium rod 251 during actual use, the following method can be used for detection.

[0079] Specific methods include:

[0080] Step 1: When the electric water heater is powered on and heating, the voltage signal between the inner tank and the magnesium rod 251 is collected, and the corrosion current and the amount of corrosion current corresponding to each period of time are recorded;

[0081] Step 2: When the electric water heater is powered off, record the water inlet temperature at the time of the power outage. After the power is restored, record the water inlet temperature again. The power-off and power-on interval is T. The corresponding corrosion current currently collected is called based on the average of the two water inlet temperatures to obtain the corrosion current during the power outage period.

[0082] Step 3: Collect data once every Δt seconds, and continuously sample for t1 seconds. This is one collection process, and calculate the current average value within the sampling period; when the current values ​​obtained in n consecutive collection processes are all lower than I0, it is determined that the magnesium rod 251 has failed and a reminder is issued.

[0083] Specifically, the magnesium rod 251 and the inner liner are placed in the same solution. Externally, the rod is connected to the inner liner via a wire attached to a conductive rod 254, forming an anti-corrosion circuit. A potential difference exists between the rod 251 and the inner liner, forming a galvanic cell. A corrosion current flows in the anti-corrosion circuit, which is collected by the current detector on the electronic control board and used to monitor the corrosion status of the inner liner. Furthermore, a resistor R connects the inner liner to the electric heating element. This creates direct electrical continuity between the rod 251 and the inner liner, with a resistor R between the rod 251 and the electric heating tube, and another resistor R between the electric heating tube and the inner liner. The corrosion current in the rod 251 and the inner liner is monitored via the electronic control board.

[0084] Specifically, step 1 is as follows: when the electric water heater is running, the electric control board is started to collect data, the voltage signal between the inner tank and the magnesium rod 251 is automatically connected in series with the sampling resistor, and the voltage signal is converted into a current signal. The electric control board samples the current signal, records the corrosion current and corrosion current amount corresponding to each period, and transmits the data to the cloud for reference and research;

[0085] Specifically, step 2 involves recording the water inlet temperature during a power outage. When power is restored, the control panel records the water inlet temperature and the power-on / off interval, T. The corrosion current during the power outage is calculated by calling the average of the two water inlet temperatures.

[0086] Specifically, step 4 is that the electric control board collects data once every △t seconds, and continuously samples for t1 seconds, which is 1 sampling. The average current value within the sampling period is calculated. When the current values ​​collected for n consecutive times are all lower than I1mA, it indicates that the magnesium rod 251 has failed and needs to be replaced as soon as possible. The electric control board sends a signal to the display panel of the electric water heater to inform the user.

[0087] The remaining amount of magnesium rod 251 is prompted. The total amount of electricity that magnesium rod 251 can provide can be calculated according to the current weight of magnesium rod 251 through Faraday's law (such as formula 1). When the current mAh recorded by the control unit is compared with the total power, the consumption level of magnesium rod 251 can be obtained. The user can view the remaining protection time in real time. When the ratio of the current to the total amount is less than 5%, it indicates that magnesium rod 251 is about to fail and the machine needs to replace magnesium rod 251 as soon as possible. The control unit sends a signal to the display panel to inform the user.

[0088] For example, formula 1: n=KQ=KIt. In the formula, K is the proportional coefficient; Q is the amount of electricity passing through the electrode; I is the current passing through the electrode; and t is the duration of the electrode reaction.

[0089] Example 2, refer to Figures 1-16 As shown, in another embodiment of the present application, the inner liner 200 includes an upper liner body 230 and a lower liner body 240, wherein the upper liner body 230 is arranged above the lower liner body 240, the water inlet pipe 210 extends into the lower liner body 240, and the water outlet pipe 220 extends into the upper liner body 230;

[0090] An electric heating device 300 includes a first electric heating tube 330, a second electric heating tube 320, and a third electric heating tube 310. The first electric heating tube 330 and the second electric heating tube 320 are disposed in the upper body, the first electric heating tube 330 extends to the water inlet of the water outlet pipe 220, the second electric heating tube 320 extends to the bottom of the upper body 230, and the third electric heating tube 310 is disposed in the lower body 240 and extends to the bottom of the lower body 240.

[0091] A water temperature detection module 600 includes a first water temperature sensor 610, a second water temperature sensor 620, and a third water temperature sensor 630. The first water temperature sensor 610 and the second water temperature sensor 620 are disposed in the upper liner 230. The first water temperature sensor 610 is disposed above the second water temperature sensor 620 and is located near the water inlet of the water outlet pipe 220. The third water temperature sensor 630 is disposed in the lower liner.

[0092] Among them, the electric control board 123 is configured to control the first electric heating tube 330 to be powered on and heated according to the water temperature detected by the first water temperature sensor 610, and is further configured to control the second electric heating tube 320 to be powered on and heated according to the water temperature detected by the second water temperature sensor 620, and is further configured to control the third electric heating tube 310 to be powered on and heated according to the water temperature detected by the third water temperature sensor 630.

[0093] Specifically, in actual use, when the user starts the electric water heater to supply hot water, the user can make the electric water heater perform different heating methods according to the user's water demand, thereby meeting the user's various hot water use needs.

[0094] Specifically, there are two heating tubes in the upper gallbladder body 230 , the first electric heating tube 330 is close to the water outlet of the water outlet pipe 220 , and the second electric heating tube 320 is located on the lower side of the upper gallbladder body 230 .

[0095] During normal water use, in order to reduce energy consumption, only the second electric heating tube 320 needs to be started to heat the water in the upper tank body 230 .

[0096] When the user starts the electric water heater and needs to use hot water immediately, the first electric heating tube 330 near the water outlet pipe 220 starts heating. The first electric heating tube 330 can quickly heat the water around the water inlet of the water outlet pipe 220 and the water flowing in the water outlet pipe 220 to meet the requirements of instant hot water supply.

[0097] When the user needs more hot water, the second heating tube on the lower side of the upper body 230 starts heating, and the third electric heating tube 310 configured on the lower body 240 also starts heating, thereby increasing the capacity of hot water.

[0098] By arranging the first electric heating tube and the second electric heating tube in the upper body and the third electric heating tube in the lower body, correspondingly, each electric heating tube is configured with a corresponding temperature sensor to detect the water temperature, so that the electric control board controls the operation of the corresponding electric heating tube according to the water temperature detected by different temperature sensors. In this way, during actual use, the user can start the electric water heater according to the demand for hot water to execute different hot water supply modes, thereby enriching the hot water supply mode of the water heater and improving the user experience.

[0099] In one embodiment of the present application, the middle portion of the first electric heating tube 330 is distributed at the bottom of the upper tank body 230 , and the free end portion of the first electric heating tube 330 extends upward along the water outlet pipe.

[0100] Specifically, to fully utilize the heat generated by the first electric heating tube 330 to heat and provide instant hot water, the first electric heating tube 330 is installed with its fixed end on the flange of the upper body 230. As the upper body 230 extends, the first electric heating tube 330 bends and extends to the bottom of the upper body. Its free end then extends upward to the outlet pipe. This allows the first electric heating tube 330 to more effectively and quickly heat the water flowing in the outlet pipe, thereby increasing the output of instant hot water.

[0101] In one embodiment, a bending portion 331 is further provided at the free end portion of the first electric heating tube. The bending portion is close to the water inlet of the water outlet pipe 220 and is located below the first water temperature sensor.

[0102] Specifically, the bent portion 331 has a larger heating area, thereby heating the water around the water inlet of the water outlet pipe 220 below the water inlet of the water outlet pipe 220 .

[0103] In another embodiment, the first water temperature sensor includes a normal temperature sensor (not shown) and an over-temperature sensor (not shown);

[0104] The electric control board 123 is configured to adjust the heating power of the first electric heating tube according to the water temperature detected by the normal temperature sensor;

[0105] The electric control board 123 is further configured to control the on and off of the first electric heating tube according to the water temperature detected by the over-temperature sensor.

[0106] Specifically, during actual use, when the user requires instant hot water, the electric control board 123 adjusts the heating power of the first electric heating tube according to the water temperature value detected by the normal temperature sensor, thereby meeting the accurate temperature control requirements.

[0107] At the same time, in normal water supply mode, heating is mainly provided by the second electric heating tube. In special circumstances, when the user continues to use water at a low flow rate, the first electric heating tube will continue to heat, and the temperature inside the tank will continue to rise. When the over-temperature sensor measures a temperature exceeding 93°C, the second electric heating tube will be forcibly shut down. If there is no water in the upper tank and it is plugged in for use, the second electric heating tube will dry out. If the detected temperature exceeds 97°C, the power supply will be forcibly cut off.

[0108] The specific control method of the electric water heater in this application includes: normal water supply mode, instant water supply mode and capacity-increasing water supply mode;

[0109] In the normal water supply mode, the second electric heating tube in the upper tank is energized, and the electric control board stops energizing the second electric heating tube after the water temperature detected by the second water temperature sensor reaches a preset temperature value;

[0110] In the instant hot water supply mode, the first electric heating tube in the upper tank is energized, and the electric control board adjusts the heating power of the first electric heating tube according to the water temperature detected by the first water temperature sensor;

[0111] When executing the capacity expansion water supply mode, the second electric heating tube in the upper body is energized, and the third electric heating tube in the lower body is energized. The electric control board stops energizing the second electric heating tube for heating after the water temperature detected by the second water temperature sensor reaches the preset temperature value. The electric control board stops energizing the third electric heating tube for heating after the water temperature detected by the third water temperature sensor reaches the preset temperature value.

[0112] Specifically, when the electric water heater is in different water heating modes, the electric control board will control the operation of the electric heating pipe according to different water temperature sensors to meet the different water needs of users.

[0113] Preferably, in order to effectively increase the amount of hot water output of the electric water heater, so as to more effectively achieve the effect of capacity expansion and reduce energy consumption, in the capacity expansion water supply mode, when the user uses water, the third electric heating tube in the lower tank is energized to continuously heat the water, and when the water temperature detected by the third water temperature sensor is lower than the first water temperature value, the second electric heating tube is activated to be energized; and when the water temperature detected by the second water temperature sensor is lower than the second water temperature value, the first electric heating tube is activated to be energized, and the electric control board adjusts the heating power of the first electric heating tube according to the water temperature detected by the first water temperature sensor.

[0114] Specifically, in the capacity expansion mode, after the water in the upper and lower tanks of the electric water heater is heated to the set temperature, when the user uses the water, the lower tank will first be heated by the third electric heating tube to fully utilize the lower tank to generate hot water to increase the capacity. Then, when the water temperature of the lower tank cannot meet the use requirements, the second electric heating tube of the upper tank is started to heat it to fully utilize the upper tank to generate hot water to increase the capacity. Moreover, when the water temperature of the upper tank is insufficient, the first electric heating tube is started to cooperate with the instant water supply to maximize the hot water output.

[0115] In this way, the existing hot water in the two upper-line tanks can be fully utilized to effectively increase the capacity, and the overall energy consumption of the electric heating device 300 can be reduced.

[0116] In another embodiment, in order to facilitate the installation of the electric control board 123, an electric appliance chamber assembly 120 is provided at one end of the housing 100, and the electric appliance chamber assembly 120 includes an end cover 121 and an inspection cover 122, and the end cover 121 is provided with a recessed structure, and a slot 1211 is provided in the recessed structure, and the end cover 121 is also provided with a plug-in channel 1212; the inspection cover 122 is provided on the end cover 121 and covers the recessed structure, and an electric appliance installation room is formed between the inspection cover 122 and the end cover 121; the electric control board 123 is located in the electric appliance installation room and inserted into the slot 1211.

[0117] In order to facilitate the fixing of the electric control board, a fixing installation member 124 is further included. The fixing installation member 124 has an inserting portion 1241 and a limiting portion 1242 . The inserting portion 1241 is inserted into the inserting channel 1212 , and the limiting portion 1242 abuts against the edge of the electric control board 123 .

[0118] Specifically, the electric water heater is equipped with an electrical room assembly 120 to place the electric control board 123. During the installation process, the electric control board 123 is first inserted into the slot 1211 set on the end cover 121, and the electric control board 123 can be pre-assembled and positioned through the slot 1211.

[0119] Then, the plug-in portion 1241 of the fixed mounting member 124 is inserted into the plug-in channel 1212 on the end cover 121, so that the fixed mounting member 124 is fixed on the end cover 121 through the plug-in portion 1241. At the same time, the limiting portion 1242 of the fixed mounting member 124 will block and abut against the outside of the electric control board 123 to limit the electric control board 123 from detaching from the slot 1211.

[0120] By setting a slot 1211 on the end cover 121, the slot 1211 can meet the requirements of inserting and positioning the electric control board 123, and the plug-in channel 1212 set on the end cover 121 can be connected to the fixed installation component 124. After the plug-in portion 1241 of the fixed installation component 124 is inserted into the plug-in channel 1212, the limiting portion 1242 of the fixed installation component 124 will abut against the edge of the electric control board 123 to limit the electric control board 123 from being separated from the slot 1211, thereby realizing a screw-free design of the electric control board 123, reducing the assembly difficulty of the electric water heater and improving the assembly efficiency.

[0121] In one embodiment, a locking portion 1213 is further provided on the end cover 121 , and a locking fitting portion 1243 is provided at the end of the plug-in portion 1241 ;

[0122] After the plug-in portion 1241 is inserted into the plug-in channel 1212 , the locking portion 1213 is connected to the locking fitting portion 1243 .

[0123] Specifically, in order to improve the installation reliability of the fixed installation component 124, for the plug-in portion 1241, after the plug-in portion 1241 is inserted into the plug-in channel 1212, the locking matching portion 1243 will also pass through the plug-in channel 1212 and cooperate with the locking portion 1213 to lock the fixed installation component 124, so that the plug-in portion 1241 of the fixed installation component 124 will not be detached from the plug-in channel 1212, thereby improving the reliability of the connection.

[0124] The locking portion 1213 and the locking fitting portion 1243 may be expressed in various forms. For example, the locking portion 1213 and the locking fitting portion 1243 may both be protruding tooth structures, and the two may be locked together to achieve a locking effect.

[0125] In another embodiment, a positioning groove 1244 is provided on the limiting portion 1242 , and an edge of the electric control board 123 is stuck in the positioning groove 1244 .

[0126] Specifically, in order to improve the reliability of the limiting portion 1242 in limiting the electric control board 123, a positioning groove 1244 is provided on the limiting portion 1242. After the fixed mounting member 124 is inserted into the plug-in channel 1212 through the plug-in portion 1241, the limiting portion 1242 will abut against the electric control board 123, and the electric control board 123 will be stuck in the positioning groove 1244.

[0127] In some embodiments, in order to improve the plugging reliability of the electric control board 123 , the slot 1211 includes two first slot bodies that are arranged opposite to each other, and the electric control board 123 is inserted between the two first slot bodies.

[0128] Specifically, during assembly, the two sides of the electric control board 123 are inserted into the corresponding first slots, and the first slots on both sides can effectively limit the position of the electric control board 123. In addition, the slot 1211 also includes a second slot, which is distributed between the two first slots and arranged opposite the limiting portion 1242. The electric control board 123 is also inserted into the second slot.

[0129] After the electric control board 123 is inserted into the first slot and assembled in place, the corresponding edges of the electric control board 123 will also be located in the slot. In this way, in conjunction with the limiting portion 1242, the four edges of the electric control board 123 are effectively positioned.

[0130] In another embodiment, a positioning rib 1214 may be further provided on the side wall of the recessed structure, and the positioning rib 1214 abuts against the electric control board 123 .

[0131] Specifically, the positioning rib 1214 can rest against the surface of the electric control board 123, and the positioning rib 1214 and the positioning groove 1244 can further limit the electric control board 123. The electric control board 123 is located in the area between the positioning rib 1214 and the positioning groove 1244, reducing the shaking of the electric control board 123.

[0132] In another embodiment of the present application, in order to optimize the overall appearance, the electric water heater further includes a housing assembly 400, wherein the housing assembly 400 includes an electric shock wall cover 410 and a cover plate 420, wherein the electric shock wall cover 410 is provided with a first mounting opening 411, and the cover plate 420 is provided with at least one mounting hole 421, and the cover plate 420 is detachably disposed in the first mounting opening 411;

[0133] The anti-electricity wall cover 410 is provided on the housing 100 , the water inlet pipe 210 and the water outlet pipe 220 extend to the outside of the housing 100 , and the water inlet pipe 210 and the water outlet pipe 220 are respectively inserted into the installation holes 421 .

[0134] Specifically, during the actual assembly process, the inner liner 200 will first be assembled into the outer shell 100, and foam will form an insulation layer between the inner liner 200 and the outer shell 100. Then, the anti-electric wall cover 410 in the cover assembly 400 will be snapped onto the outer shell 100.

[0135] During the installation process, the water inlet pipe 210 and the water outlet pipe 220 will be inserted into the larger first installation opening 411 formed by the anti-electricity wall cover 410. Since the water inlet pipe 210 and the water outlet pipe 220 can move relatively far in the first installation opening 411, when assembling the anti-electricity wall cover 410, the position of the anti-electricity wall cover 410 can be adjusted as needed to facilitate and reliably assemble it to the outer shell 100, thereby avoiding the increased difficulty of assembly caused by interference between the water inlet pipe 210 and the water outlet pipe 220 and the anti-electricity wall cover 410.

[0136] After the electric shock wall cover 410 is assembled, the cover plate 420 is assembled onto the electric shock wall cover 410 to cover the first installation opening 411 , and the water inlet pipe 210 and the water outlet pipe 220 pass through the corresponding installation holes 421 .

[0137] By providing a first mounting port 411 on the anti-electricity wall cover 410 and providing a detachable cover plate 420 in the first mounting port 411, during the actual assembly process, when the anti-electricity wall cover 410 is assembled to the outer shell 100, the cover plate 420 is first removed from the anti-electricity wall cover 410, so that the inlet and outlet water pipes 220 can be inserted into the first mounting port 411 first, and the opening size of the first mounting port 411 can be large enough to meet the displacement requirements when the anti-electricity wall cover 410 is assembled. After the anti-electricity wall cover 410 is assembled in place, the cover plate 420 is assembled to the anti-electricity wall cover 410 to meet the requirements of covering the area around the inlet and outlet water pipes 220, thereby reducing the assembly difficulty of the electric water heater and improving the assembly quality.

[0138] In one embodiment of the present application, the first mounting port 411 is a strip-shaped structure and extends along the length direction of the housing 100 , and at least two mounting holes 421 are provided on the cover plate 420 , the water inlet pipe 210 is inserted into one of the mounting holes 421 , and the water outlet pipe 220 is inserted into the other mounting hole 421 .

[0139] Specifically, the cover plate 420 is provided with at least two mounting holes 421, which respectively meet the installation requirements of the water inlet pipe 210 and the water outlet pipe 220. Regarding the structural shape of the first mounting opening 411, to increase the adjustment range of the electric shock barrier 410, the first mounting opening 411 is a strip-shaped structure that extends along the length of the housing 100. This allows the electric shock barrier 410 to be snapped onto the housing 100 from one side along the length of the housing 100 during installation. The long length of the first mounting opening 411 ensures that the electric shock barrier 410 does not interfere with the water inlet pipe 210 or the water outlet pipe 220 during installation.

[0140] In some embodiments, the specific assembly method of the cover plate 420 can have various structural forms. For example, the cover plate 420 is fixed to the anti-electrical wall cover 410 by screws, or the cover plate 420 is clamped on the anti-electrical wall cover 410.

[0141] In another embodiment, the electric shock wall cover 410 has a front panel 412, a side panel 413 and a bottom panel 414, the front panel 412 is arranged on the front edge of the bottom panel 414, the side panel 413 is arranged on the corresponding sides of the front panel 412 and the bottom panel 414, the bottom panel 414 is provided with the first mounting port 411, the front panel 412 is clamped on the outer shell 100, and the edge of the side panel 413 that fits with the outer shell 100 matches the outer contour of the outer shell 100.

[0142] Specifically, the electric shock wall cover 410 is mounted on the housing 100 via a front panel 412. The housing 100 is provided with a mounting hole 110, which is a bar-shaped hole with one end of the hole being narrower than the other end. The front panel 412 is provided with a latch 415, which is inserted into the mounting hole 110.

[0143] The insertion hole 110 extends along the length direction of the shell 100. During assembly, the tongue 415 is inserted into the end of the insertion hole 110 with a larger width, and then the anti-electric wall cover 410 is pushed so that the tongue 415 is stuck on the end of the insertion hole 110 with a smaller width to complete the assembly.

[0144] In order to improve the reliability of the snap-in assembly, a snap-in tongue 415 may be additionally configured on the side panel 413 to assist the snap-in connection of the front panel 412 through the side panel 413 , thereby improving the reliability of the assembly.

[0145] In one embodiment of the present application, a second installation opening 416 is provided on the front panel 412 , and a detachable control panel 430 is provided in the second installation opening 416 .

[0146] Specifically, the second installation opening 416 provided on the front panel 412 is used to install the control panel 430 , and the control panel 430 is installed in the second installation opening 416 by means of snap-fit ​​screw connection or the like.

[0147] In another embodiment of the present application, a hidden cover 440 is further included. The hidden cover 440 is detachably disposed at the bottom of the anti-electricity wall cover 410 and covers the water inlet pipe 210 and the water outlet pipe 220 .

[0148] Specifically, in order to optimize the overall appearance, a hidden cover 440 can be set on the anti-electricity wall cover 410. The hidden cover 440 can block the parts of the water inlet pipe 210 and the water outlet pipe 220 extending outside the anti-electricity wall cover 410, thereby optimizing the overall appearance of the water heater.

[0149] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0150] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. An electric water heater with anti-potential corrosion function, characterized in that: include: A housing, wherein a water inlet pipe and a water outlet pipe are arranged on the housing, and an electric control panel is also arranged in the housing; An inner tank, wherein the inner tank is connected to the water inlet pipe and the water outlet pipe respectively; An electric heating device, wherein the electric heating device is arranged in the inner tank; The water inlet pipe and the water outlet pipe adopt an anti-potential corrosion pipe group, which includes an inner pipe body, an insulating fixture and an external pipe body. The insulating fixture is provided with a connecting hole, and the inner pipe body is connected to the external pipe body through the insulating fixture. The inner pipe body is connected to the external pipe body through the connecting hole, and the inner pipe body and the external pipe body are insulated and isolated; the insulating fixture is provided on the inner tank, the inner pipe body is located in the inner tank, and the external pipe body is located outside the inner tank and is configured to be the same metal material as the water pipe connected to the outside.

2. The electric water heater with anti-potential corrosion function according to claim 1, characterized in that: The insulating fixing piece is also provided with an auxiliary connecting piece, which is a sleeve structure and is sleeved on the outside of the inner tube body. The inner wall of the auxiliary connecting piece is provided with an internal thread, and the auxiliary connecting piece is insulated and isolated from the inner tube body.

3. The electric water heater with anti-potential corrosion function according to claim 2, characterized in that: The external tube body and the auxiliary connecting piece are embedded in the insulating fixing piece.

4. The electric water heater with anti-potential corrosion function according to claim 2, characterized in that: The insulating fixing piece is also provided with a spacer structure, and the spacer structure is located between the inner tube body and the auxiliary connecting piece.

5. The electric water heater with anti-potential corrosion function according to claim 1, characterized in that: The communicating hole is a stepped hole structure, a step surface is formed in the communicating hole, and the inner tube body is inserted into the communicating hole and abuts against the step surface.

6. The electric water heater with anti-potential corrosion function according to any one of claims 1 to 5, characterized in that: Also includes corrosion-resistant components; The anti-corrosion component comprises: A magnesium rod, one end of which is provided with a socket; An insulating component, wherein a first through hole is provided on the insulating component; A fixed installation component, wherein a second through hole is provided on the fixed installation component, and the fixed installation component is configured to be fixedly installed on the inner tank of the water heater; A conductive rod, the conductive rod sequentially passes through the second through hole and the first through hole and is inserted into the jack, the conductive rod being conductively connected to the magnesium rod and the fixed installation component respectively; The insulating component is disposed between the magnesium rod and the fixing component.

7. The electric water heater with anti-potential corrosion function according to claim 6, characterized in that: A sealing ring is provided between the insulating component and the magnesium rod; and / or a sealing ring is provided between the insulating component and the fixed installation component.

8. The electric water heater with anti-potential corrosion function according to claim 7, characterized in that: The conductive rod is provided with a retaining ring; the retaining ring is abutted against the end of the magnesium rod and is sandwiched between the sealing ring and the magnesium rod; An insulating coating is also provided on the rod wall of the conductive rod, the insulating coating is adjacent to the retaining ring, and the portion of the conductive rod having the insulating coating is inserted into the insertion hole.

9. The electric water heater with anti-potential corrosion function according to claim 8, characterized in that: Also includes: A housing assembly, the housing assembly comprising an anti-electricity wall cover and a cover plate, the anti-electricity wall cover is provided with a mounting opening, the cover plate is provided with at least a mounting hole, and the cover plate is detachably arranged in the mounting opening; Wherein, the anti-electricity wall cover is arranged on the outer shell, and the water inlet pipe and the water outlet pipe are respectively inserted into the installation holes.

10. The electric water heater with anti-potential corrosion function according to claim 9, characterized in that: It also includes a hidden cover, which is detachably arranged on the bottom of the anti-electricity wall cover and covers the water inlet pipe and the water outlet pipe.

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