Bubble water generating device of electric water heater and control method thereof

Abstract

The application discloses a bubble water generating device of an electric water heater and a control method thereof. The bubble water generating device is additionally arranged in an inner container of the electric water heater, air is continuously provided into a gas dissolving tank through mutual cooperation of the gas dissolving tank and an air pump, and thus a large amount of bubble water is formed. The bubble water generating device has a simple structure, air is provided into the inner container to generate a large amount of bubble water, and thus the use experience of a user is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a bubble water generating device of an electric water heater and a control method thereof. Background Art

[0002] Sparkling water's cleansing properties have made it a new trend in the water heating equipment industry. Widely used in daily life, it's increasingly popular with users. Currently, some electric water heaters with micro-bubble water incorporate an air tank within the internal and external water channels, enabling a bubble bath. This system uses a solenoid valve to shut off the tap water supply, then inflates the tank with an air pump or a water pump. Once inflated, the solenoid valve is opened to restore tap water flow. As the hot water continues to flow, the microbubble concentration gradually decreases, making it inadequate for high-volume bathing applications. Furthermore, the addition of the air tank increases the number of pipes in the water heater, increasing the overall dimensions of the unit. This inadvertently reduces the installation space within the water heater's inner tank, creating inconveniences in both product design and installation.

[0003] Therefore, it is necessary to design an electric water heater with the function of outputting bubble water. Summary of the Invention

[0004] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a bubble water generating device for an electric water heater, which has a simple structure and generates a large amount of bubble water by providing air into the inner tank, thereby effectively improving the user experience.

[0005] In addition, the present invention proposes a control method for an electric water heater, which is simple and feasible and can effectively improve the stability of micro-bubble water generation.

[0006] The first objective is achieved through the following technical solutions:

[0007] A bubble water generating device for an electric water heater, the electric water heater comprising an inner tank, the inner tank being connected to a water supply pipe, the water supply pipe being provided with a water valve, and further comprising:

[0008] A dissolved air tank, the dissolved air tank being arranged inside the inner container;

[0009] A water inlet pipe, one end of which is connected to the dissolved air tank, and the other end of which is connected to the inner container;

[0010] A vent pipe, one end of which is connected to the air dissolving tank and the other end is connected to the outside, and an air pump is provided on the vent pipe;

[0011] A water outlet pipe, one end of which is connected to the dissolved air tank, and the other end of which is connected to an external water point;

[0012] A drain pipe connected to the water outlet pipe to discharge the water in the dissolved air tank, and a drain valve is provided on the drain pipe;

[0013] A controller is electrically connected to the water valve, the air pump, and the drain valve respectively.

[0014] In some embodiments, a first one-way valve is further included. The first one-way valve is arranged on the water inlet pipe, and the conducting direction of the first one-way valve is configured to open in one direction from the inner container to the inside of the air dissolving tank.

[0015] In some embodiments, the water inlet pipe has a connected water inlet and water outlet, wherein the water inlet is connected to the inside of the inner tank, the water outlet passes through the top wall of the air dissolving tank from top to bottom and extends into the air dissolving tank, and the first one-way valve is arranged on the water outlet.

[0016] In some embodiments, a second one-way valve is further included, which is arranged on the ventilation pipe and is configured to open in one direction from the outside of the inner container to the inside of the gas dissolving tank.

[0017] In some embodiments, the ventilation pipe has an air inlet and an air outlet that are connected to each other, wherein the air inlet is connected to the outside, the air outlet passes through the bottom wall of the air dissolving tank from bottom to top and extends into the air dissolving tank, and the second one-way valve is arranged on the air outlet.

[0018] In some embodiments, in the vertical direction, the height of the air outlet end of the vent pipe is higher than the height of the water outlet end of the water inlet pipe.

[0019] In some embodiments, a water flow sensor is further included. The water flow sensor is disposed on the water supply pipe and is electrically connected to the controller.

[0020] In some embodiments, a flow guide is further included, and the flow guide is disposed in the air dissolving tank.

[0021] The second objective is achieved through the following technical solutions:

[0022] A control method for an electric water heater is applied to the bubble water generating device as described in any of the above embodiments, and the control method for the electric water heater comprises the following steps:

[0023] After the electric water heater enters the microbubble standby mode;

[0024] Close the water valve, open the drain valve and start the water pump to drain the water in the air dissolving tank;

[0025] Recording the drainage time, and when the drainage time reaches a preset time value, reopening the water valve, and simultaneously closing the drain valve and the water pump to enable the electric water heater to enter a micro-bubble operation mode;

[0026] After the water point is opened, the water flow of the water supply pipe is detected to obtain a water flow value;

[0027] Comparing the water flow rate value with a preset water volume value, and restarting the air pump according to the comparison result so that the air pump works according to the preset initial working condition;

[0028] Detecting the current water flow of the water supply pipe again to obtain a water flow value;

[0029] The water flow rate value is compared with the preset water volume value again, and the comparison result is used to determine whether the air pump has reached the preset upper limit working condition, thereby improving the current working condition of the air pump.

[0030] In some embodiments, the step of comparing the water flow value with a preset water flow value and restarting the air pump according to the comparison result so that the air pump operates according to a preset initial working condition includes:

[0031] Determining whether the water flow rate value is greater than the preset water flow value;

[0032] If yes, restart the air pump to operate according to the preset initial working conditions;

[0033] If not, the process returns to detect the water flow of the water supply pipe again to obtain the water flow.

[0034] In some embodiments, the step of comparing the water flow rate value with a preset water volume value, and determining whether the air pump has reached a preset upper limit operating condition based on the comparison result, thereby further improving the current operating condition of the air pump includes:

[0035] Determining whether the water flow rate value is greater than the preset water flow value;

[0036] If so, determining whether the air pump has reached a preset upper limit operating condition;

[0037] If not, the air pump continues to operate according to the preset initial working condition.

[0038] In some embodiments, the step of determining whether the air pump has reached a preset upper limit operating condition includes:

[0039] Determining whether the air pump has reached the preset upper limit operating condition;

[0040] If yes, the air pump continues to operate according to the preset initial working condition;

[0041] If not, the current working condition of the air pump is improved.

[0042] Compared with the prior art, the present invention has at least the following beneficial effects:

[0043] 1. The bubble water generating device of the electric water heater of the present invention has a simple structure and generates a large amount of bubble water by providing air into the inner tank, thereby effectively improving the user experience.

[0044] 2. The control method of the electric water heater of the present invention is simple and feasible, and can effectively improve the stability of microbubble water generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 1 is a schematic structural diagram of an electric water heater in a first embodiment of the present invention;

[0046] Figure 2 It is a flow chart of a control method for an electric water heater in the second embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only 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 should fall within the scope of the technical solutions claimed by the present invention.

[0048] Example 1:

[0049] like Figure 1 As shown, this embodiment provides a bubble water generating device for an electric water heater, the electric water heater having an inner tank 1, the inner tank 1 being connected to a water supply pipe 11, a water valve 12 being provided on the water supply pipe 11, and further comprising:

[0050] The dissolved air tank 2 is arranged inside the inner tank 1;

[0051] A water inlet pipe 3, one end of which is connected to the air dissolving tank 2, and the other end of which is connected to the inner tank 1;

[0052] A vent pipe 4, one end of which is connected to the air dissolving tank 2 and the other end is connected to the outside. An air pump 41 is provided on the vent pipe 4;

[0053] A water outlet pipe 5, one end of which is connected to the dissolved air tank 2, and the other end is connected to an external water point;

[0054] Drain pipe 6, which is connected to the water outlet pipe 5 to discharge the water in the dissolved air tank 2, and a drain valve 61 is provided on the drain pipe 6;

[0055] The controller is electrically connected to the water valve 12 , the air pump 41 , and the drain valve 61 .

[0056] In this embodiment, a bubble water generating device is added to the inner tank 1 of the electric water heater, and air is continuously supplied to the air dissolving tank 2 through the mutual cooperation of the air dissolving tank 2 and the air pump 41, thereby forming a large amount of bubble water. The structure is simple, and a large amount of bubble water is generated by supplying air to the inner tank 1, thereby effectively improving the user experience.

[0057] In this embodiment, the electric water heater has an inner tank 1 and a heater arranged inside the inner tank 1, the heater performs a heating operation to heat the purified water in the inner tank 1, the inner tank 1 is connected to a water supply pipe 11, the water supply pipe 11 is connected to the external water supply so that the external water supply passes through the water supply pipe 11 to supply water to the inner tank 1, the air dissolving tank 2 is arranged inside the inner tank 1, and the air dissolving tank 2 is a tank-shaped structure with a hollow inner cavity, the air dissolving tank 2 is interconnected with the space inside the inner tank 1 through the water inlet pipe 3 to facilitate the purified water or hot water in the inner tank 1 to enter the air dissolving tank 2 through the water inlet pipe 3, the water valve 12 is arranged on the water supply pipe 11 so that the water valve controls the on and off of the water supply pipe 11, the air dissolving tank 2 is interconnected with the outside of the inner tank 1 through the vent pipe 4, and an air pump 4 is provided on the vent pipe 4. 1 is used to control the on / off state of the vent pipe 4. The air pump 41 is used to introduce external air and water into the air dissolving tank 2 through the vent pipe 4, thereby transporting air into the air dissolving tank 2. A drain pipe 6 is connected between the water outlet pipe 5 and the external water point. A drain valve 61 is provided on the drain pipe 6 so that the drain valve 61 controls the on / off state of the drain pipe 6, thereby facilitating the discharge of water stored in the air dissolving tank 2. The air dissolving tank 2 is connected to the external water point through the water outlet pipe 5 to facilitate the transport of generated bubble water or purified water to the external water point through the water outlet pipe 5, thereby achieving the output of pure hot water or hot water with bubbles. The controller controls the water valve 12, the air pump 41, and the drain valve 61 to perform corresponding operations to provide air into the inner tank 1, thereby causing the electric water heater to generate a large amount of bubble water.

[0058] In this embodiment, a three-way valve is provided at the bottom of the dissolved air tank 2, and the two outlets of the three-way valve are respectively connected to the water outlet pipe 5 and the drain pipe 6, and the drain outlet of the drain pipe 6 is connected to the floor drain pipe or other container.

[0059] Furthermore, a first one-way valve 32 is included. The first one-way valve 32 is arranged on the water inlet pipe 3, and the conducting direction of the first one-way valve 32 is configured to open in one direction from the inner container 1 to the inside of the air dissolving tank 2.

[0060] Preferably, the water inlet pipe 3 has a connected water inlet and water outlet, wherein the water inlet is connected to the inner tank 1, and the water outlet passes through the top wall of the dissolved air tank 2 from top to bottom and extends into the dissolved air tank 2, and the first one-way valve 32 is set on the water outlet.

[0061] Specifically, a second one-way valve 42 is further included. The second one-way valve 42 is provided on the vent pipe 4 , and the conducting direction of the second one-way valve 42 is configured to open in one direction from the outside of the inner container 1 to the inside of the gas dissolving tank 2 .

[0062] Preferably, the vent pipe 4 has an air inlet and an air outlet that are connected, wherein the air inlet is connected to the outside, and the air outlet passes through the bottom wall of the air dissolving tank 2 from bottom to top and then extends into the air dissolving tank 2, and the second one-way valve 42 is set on the air outlet.

[0063] Furthermore, in the vertical direction, the height of the air outlet end of the vent pipe 4 is higher than the height of the water outlet end of the water inlet pipe 3 .

[0064] In this embodiment, the volume of the air dissolving tank 2 is greater than 1L, which can help to prolong the time of outputting micro-bubble water. The air dissolving tank 2 can be installed in the inner liner 1 by screws or other connecting structures. When the air dissolving tank 2 is installed in the inner liner 1, the lower end of the air dissolving tank 2 is connected to the bottom wall of the inner liner 1, and the upper end thereof extends from the bottom to the top, so that the air dissolving tank 2 is a shell with a hollow inner cavity, and the shell is a can-shaped structure. The first one-way valve 32 is provided on the water outlet, and the first one-way valve 32 is provided on the water outlet. Since the conducting direction of the first one-way valve 32 is constituted to be opened in one direction from the inner bag 1 to the inner part of the gas tank 2, the gas in the gas tank 2 can be prevented from flowing back into the inner bag 1. In addition, the air inlet of the vent pipe 4 is connected with the outside, and the air outlet passes through the bottom wall of the inner bag 1 and the bottom wall of the gas tank 2 from bottom to top in sequence and then extends into the gas tank 2. The second one-way valve 42 is preferably provided on the air outlet. Of course, the installation position of the second one-way valve 42 is not limited to being installed on the air outlet. The second one-way valve 42 can also be provided on the air inlet, which is conducive to introducing external air into the gas tank 2. Since the conducting direction of the second one-way valve 42 is constituted to be opened in one direction from the outside of the inner bag 1 to the inner part of the gas tank 2, the gas entering the gas tank 2 can be avoided to flow back. More preferably, in the vertical direction, the height of the air outlet end of the vent pipe 4 is higher than the height of the water outlet end of the water inlet pipe 3, that is, in the vertical direction inside the air dissolving tank 2, the height of the air outlet is higher than the height of the water outlet, thereby effectively improving the generation effect of bubble water.

[0065] Furthermore, a water flow sensor 7 is included. The water flow sensor 7 is arranged on the water supply pipe 11, and the water flow sensor 7 is electrically connected to the controller.

[0066] In this embodiment, the water flow sensor 7 is provided on the water inlet pipe 3 to detect the water flow on the water supply pipe 11, thereby feeding back the acquired water flow value to the controller, and the controller performs corresponding actions according to the received data.

[0067] In particular, the device further comprises a flow guide 8 , which is arranged in the air dissolving tank 2 .

[0068] In this embodiment, a guide member 8 is provided in the air dissolving tank 2. The guide member 8 enables air to dissolve more easily in water to generate micro-bubble water, thereby effectively improving the generation effect of bubble water. More preferably, the guide member 8 can be set as a flat plate with a plate-like structure, and a plurality of through holes are provided on the flat plate at intervals, so that the air and water supply entering the air dissolving tank 2 can achieve a water-gas mixing effect. Of course, the guide member 8 can also adopt a guide structure with different structures or appearances to achieve a water-gas mixing effect, thereby enhancing the gas-liquid mixing effect under the action of the guide member 8, and thus achieving the stability of micro-bubble water generation.

[0069] In this embodiment, an operation display is provided on the outer wall of the electric water heater. The operation display is provided with a microbubble button for turning on the microbubble mode. The user uses the microbubble button to make the electric water heater quickly enter the microbubble water function. The microbubble water function includes a microbubble standby mode, a microbubble inflation mode, and a microbubble operation mode in sequence, thereby enabling the gas water heater to generate microbubble water.

[0070] In this embodiment, when a user desires to use the microbubble water function, the electric water heater first disconnects the water path of the water supply pipe 11 via the water valve 12. The drain valve 61 is then opened to drain the water stored in the air dissolving tank 2. Simultaneously, the air pump 41 is activated to introduce external air into the air dissolving tank 2, thereby pre-filling the air dissolving tank 2 with air. The water valve 12 then connects the water path of the water supply pipe 11, allowing external water to enter the inner tank 1 through the water supply pipe 11 and heat the hot water entering the inner tank 1. When the user turns on the water valve at the water point, the hot water in the inner tank 1 enters the air dissolving tank 2 through the water inlet pipe 3. The guide member 8 causes the external air and hot water to mix, and the air pump 41 is activated again to pump air to continuously output microbubble water.

[0071] Example 2:

[0072] like Figure 2As shown, this embodiment provides a control method for an electric water heater, which is applied to a bubble water generating device as described in any one of the first embodiments. When a user needs to use the micro-bubble water function, the electric water heater first disconnects the water path of the water supply pipe through the water valve, then opens the drain valve to discharge the water stored in the air dissolving tank, and simultaneously starts the air pump to introduce external air into the air dissolving tank, so that the air dissolving tank is pre-filled with air. Then, the water valve connects the water path of the water supply pipe to allow external water to enter the inner tank through the water supply pipe, and heats the hot water entering the inner tank. When the user turns on the water valve switch of the water use point, the hot water in the inner tank enters the air dissolving tank through the water inlet pipe, and under the action of the guide member, the external air and hot water are mixed to form a gas-liquid mixture. At the same time, the air pump is started again to pump air to continuously output micro-bubble water. The method is simple and feasible, and can effectively improve the stability of micro-bubble water generation.

[0073] The control method of the electric water heater in this embodiment specifically includes the following steps:

[0074] Step S101: The electric water heater enters a microbubble standby mode.

[0075] In this embodiment, the microbubble function is activated by operating the microbubble button on the display, thereby causing the electric water heater to enter the microbubble standby mode.

[0076] Step S102: close the water valve, open the drain valve and start the water pump to drain the water in the dissolved air tank.

[0077] In this embodiment, the controller closes the water inlet valve to introduce external water supply into the inner tank, opens the drain valve to connect the drain pipe to discharge the water stored in the dissolved air tank, and simultaneously turns on the air pump to inject external air into the dissolved air tank. At the same time, due to the action of air pressure, the first one-way valve disconnects the connection between the water inlet pipe and the dissolved air tank. Furthermore, the water stored in the dissolved air tank is automatically discharged outward through the drain pipe under the action of air pressure. At the same time, the air pump is used to inflate the interior of the dissolved air tank, thereby switching the electric water heater from the microbubble standby mode to the microbubble charging mode.

[0078] Step S103, recording the drainage time, until the drainage time reaches a preset time value, reopening the water valve, and simultaneously closing the drain valve and the water pump to put the electric water heater into the micro-bubble operation mode.

[0079] In this embodiment, since the controller has a timing function, the drainage time can be recorded by the controller. When the controller detects that the drainage time has reached a preset time value, it determines that the air dissolving tank is full of air, and then reopens the water valve. At the same time, the drain valve and the water pump are closed to switch the electric water heater from the microbubble inflation mode to the microbubble operation mode. The water valve is reopened to connect the water supply pipe of the water heater. Part of the water supply is instantly sprayed into the air dissolving tank, further compressing the air in the tank, causing it to dissolve into the water to form low-concentration microbubble water. In this embodiment, the preset time value is preferably a fixed value or set by the parameter setting mode of the controller. More preferably, the preset time value is determined based on the volume of the air dissolving tank or the actual drainage time. If the volume of the air dissolving tank is 1L, its drainage time can be set to 10s to 20s.

[0080] Step S104: After the water point is opened, the current water flow of the water supply pipe is detected to obtain the water flow value.

[0081] In step S105 , the water flow rate value is compared with a preset water volume value, and the air pump is restarted according to the comparison result so that the air pump works according to the preset initial working condition.

[0082] Specifically, the water flow value is compared with a preset water flow value, and the steps of determining whether the air pump has reached a preset upper limit working condition according to the comparison result, thereby further improving the current working condition of the air pump include:

[0083] Determine whether the water flow value is greater than the preset water value;

[0084] If so, determine whether the air pump has reached the preset upper limit operating condition;

[0085] If not, the air pump continues to work according to the preset initial working conditions.

[0086] In this embodiment, the air pump has a preset upper limit operating condition, a preset initial operating condition and a preset lower limit operating condition set in sequence from large to small, wherein the preset upper limit operating condition is the maximum operating state of the air pump, the preset initial operating condition is the default operating state of the air pump, and the preset lower limit operating condition is the minimum operating state of the air pump. In addition, the preset initial operating condition is a fixed value or is pre-set by the parameter setting of the controller. The preset upper limit operating condition is generally the operating condition with the highest output efficiency of the air pump, and the preset initial operating condition is generally 50% to 80% of the preset upper limit operating condition of the air pump.

[0087] In this embodiment, after the water point is opened, that is, after the user opens the bathing valve when the electric water heater is in shower mode, the water flow sensor detects the water flow of the water supply pipe to obtain the water flow value, and determines whether the water flow value is greater than the preset water volume value. If so, the controller turns on the air pump to work according to the preset initial working conditions. If not, it returns to step S104 to detect the current water flow of the water supply pipe again to obtain the water flow value.

[0088] Step S106: The current water flow rate of the water supply pipe is detected again to obtain a water flow rate value.

[0089] Step S107, again comparing the water flow value with the preset water value, and judging whether the air pump has reached the preset upper limit working condition according to the comparison result, so as to improve the current working condition of the air pump again.

[0090] Specifically, the water flow value is compared with a preset water flow value, and the steps of determining whether the air pump has reached a preset upper limit working condition according to the comparison result, thereby further improving the current working condition of the air pump include:

[0091] Determine whether the water flow value is greater than the preset water value;

[0092] If so, determine whether the air pump has reached the preset upper limit operating condition;

[0093] If not, the air pump continues to work according to the preset initial working conditions.

[0094] Furthermore, the steps of determining whether the air pump has reached the preset upper limit operating condition include:

[0095] Determine whether the air pump has reached the preset upper limit operating condition;

[0096] If yes, the air pump continues to work according to the preset initial working conditions;

[0097] If not, the current working condition of the air pump is improved, and the water flow value is compared with the preset water value again.

[0098] In this embodiment, after the air pump operates according to the preset initial working condition, the current water flow of the water supply pipe is detected again to obtain the water flow value, and it is judged again whether the water flow value is greater than the preset water value. If so, it is judged whether the air pump has reached the preset upper limit working condition. If not, the air pump is controlled to continue to operate according to the preset initial working condition. In addition, the step after judging whether the air pump has reached the preset upper limit working condition also includes judging whether the air pump has reached the preset upper limit working condition. If so, it returns to step S105 and causes the air pump to continue to work according to the preset initial working condition; if not, it improves the current working condition of the air pump. After improving the working condition of the air pump, it returns to judge again whether the water flow value is greater than the preset water value, so that the air pump gradually improves the working condition until the air pump reaches the preset upper limit working condition. More preferably, the preset water value is preferably set to 1L / min.

[0099] In this embodiment, when the water flow rate value remains unchanged, the preset water volume value and the air pump working condition are in an increasing function relationship, that is, the higher the air pump working condition, the larger the preset water volume value. The calculation formula of the preset water volume value is as follows:

[0100] V=(RR 初始)*(V max -V0) / (R max -R 初始 )+V0;

[0101] Among them, R is the preset working condition of the air pump, R 初始 is the preset initial working condition of the air pump, V max is the preset water volume value when the air pump is in the preset upper limit working condition; V0 is the preset water volume value when the air pump is in the preset initial working condition; R max It is the preset upper limit operating condition of the air pump.

[0102] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A control method for an electric water heater, wherein the electric water heater comprises an inner tank (1), the inner tank (1) is connected to a water supply pipe (11), and a water valve (12) is provided on the water supply pipe (11), characterized in that: Also includes: An air dissolving tank (2), the air dissolving tank (2) being arranged inside the inner container (1); A water inlet pipe (3), one end of the water inlet pipe (3) is connected to the dissolved air tank (2), and the other end is connected to the inner container (1); A vent pipe (4), one end of the vent pipe (4) is connected to the air dissolving tank (2), and the other end is connected to the outside, and an air pump (41) is provided on the vent pipe (4); A water outlet pipe (5), one end of which is connected to the dissolved air tank (2) and the other end of which is connected to an external water point; A drainage pipe (6), the drainage pipe (6) being connected to the water outlet pipe (5) to discharge the water stored in the dissolved air tank (2), and a drainage valve (61) being provided on the drainage pipe (6); A controller, the controller being electrically connected to the water valve (12), the air pump (41), and the drain valve (61); a first one-way valve (32), the first one-way valve (32) being arranged on the water inlet pipe (3), and the conducting direction of the first one-way valve (32) being configured to open in one direction from the inner liner (1) to the inside of the dissolved air tank (2), the water inlet pipe (3) having a water inlet and a water outlet connected to each other, wherein the water inlet is connected to the inside of the inner liner (1), the water outlet passes through the top wall of the dissolved air tank (2) from top to bottom and then extends into the dissolved air tank (2), and the first one-way valve (32) is arranged on the water outlet; a second one-way valve (42), the second one-way valve (42) being arranged on the vent pipe (4), and the conducting direction of the second one-way valve (42) being configured to open in one direction from the outside of the inner container (1) to the inside of the dissolved gas tank (2); The control method of the electric water heater comprises the following steps: After the electric water heater enters the microbubble standby mode; Close the water valve, open the drain valve and start the water pump to drain the water in the air dissolving tank; Recording the drainage time, and when the drainage time reaches a preset time value, reopening the water valve, and simultaneously closing the drain valve and the water pump to enable the electric water heater to enter a micro-bubble operation mode; After the water point is opened, the water flow of the water supply pipe is detected to obtain a water flow value; Comparing the water flow rate value with a preset water volume value, and restarting the air pump according to the comparison result so that the air pump works according to the preset initial working condition; Detecting the current water flow of the water supply pipe again to obtain a water flow value; The water flow rate value is compared with the preset water volume value again, and the comparison result is used to determine whether the air pump has reached the preset upper limit working condition, thereby improving the current working condition of the air pump.

2. The control method of an electric water heater according to claim 1, characterized in that: The vent pipe (4) has an air inlet and an air outlet that are connected to each other, wherein the air inlet is connected to the outside, and the air outlet passes through the bottom wall of the air dissolving tank (2) from bottom to top and then extends into the air dissolving tank (2), and the second one-way valve (42) is arranged on the air outlet.

3. The control method of an electric water heater according to claim 1, characterized in that: In the vertical direction, the height of the air outlet end of the vent pipe (4) is higher than the height of the water outlet end of the water inlet pipe (3).

4. The control method of an electric water heater according to claim 1, characterized in that: It also includes a water flow sensor (7), which is arranged on the water supply pipe (11), and the water flow sensor (7) is electrically connected to the controller.

5. A control method for an electric water heater according to any one of claims 1 to 4, characterized in that: It also includes a flow guide (8), which is arranged in the air dissolving tank (2).

6. The control method of an electric water heater according to claim 1, characterized in that: The step of comparing the water flow value with a preset water flow value and restarting the air pump according to the comparison result so that the air pump works according to the preset initial working condition includes: Determining whether the water flow rate value is greater than the preset water flow value; If yes, restart the air pump to operate according to the preset initial working conditions; If not, the process returns to detect the water flow of the water supply pipe again to obtain the water flow.

7. The control method of an electric water heater according to claim 1, characterized in that: The step of comparing the water flow value with a preset water flow value and determining whether the air pump has reached a preset upper limit operating condition based on the comparison result, thereby further improving the current operating condition of the air pump includes: Determining whether the water flow rate value is greater than the preset water flow value; If so, determining whether the air pump has reached a preset upper limit operating condition; If not, the air pump continues to operate according to the preset initial working condition.

8. The control method of an electric water heater according to claim 7, characterized in that: The step of determining whether the air pump has reached the preset upper limit operating condition includes: Determining whether the air pump has reached the preset upper limit operating condition; If yes, the air pump continues to operate according to the preset initial working condition; If not, the current working condition of the air pump is improved.

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