CN113639460A

CN113639460A - Self-cleaning system and self-cleaning method for gas water heater

Info

Publication number: CN113639460A
Application number: CN202111076766.4A
Authority: CN
Inventors: 张俊新; 郑来松; 周春萍; 潘叶江
Original assignee: Vatti Co Ltd
Current assignee: Vatti Co Ltd
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2021-11-12
Anticipated expiration: 2041-09-14
Also published as: CN113639460B

Abstract

The invention provides a self-cleaning system of a gas water heater, which comprises a circulating pipeline, a water pump, an adding tank, a main water inlet valve, a controller, a WIFI module and a mobile device APP. The circulation pipeline comprises a cold-hot conversion pipeline and a cold water pipeline communicated with the cold-hot conversion pipeline through a one-way valve, the cold-hot conversion pipeline comprises a cold water side and a hot water side communicated with the cold water side, and a cold water outlet and a hot water outlet which are controlled through a water outlet valve are arranged at the joint of the hot conversion pipeline and the cold water pipeline. The water pump is arranged on the cold water inlet side. The adding tank is arranged on the cold water inlet side and is communicated with the cold water pipeline through an electromagnetic valve. The main water inlet valve is arranged at the water inlet end of the circulating pipeline to control the on-off of the circulating pipeline and external water supply. The controller is used for controlling the one-way valve, the water pump and the electromagnetic valve. The WIFI module is arranged in the gas water heater and electrically connected with the controller. Mobile device APP communication connection WIFI module. The self-cleaning system of the gas water heater can realize self-cleaning, is simple to operate, reduces cleaning cost and does not need field attendance.

Description

Self-cleaning system and self-cleaning method for gas water heater

Technical Field

The invention relates to the field of kitchen utensils, in particular to a self-cleaning system and a self-cleaning method for a gas water heater.

Background

The household water channel pipeline is used for a long time, and scale deposition is difficult to avoid. Particularly, the hot water heated by the gas water heater can precipitate water scale more seriously. Therefore, the market also has household services with clean water pipes, and the cost is not low.

Disclosure of Invention

The invention aims to provide a self-cleaning system of a gas water heater, which can realize self-cleaning, is simple to operate, reduces the cleaning cost and does not need field attendance.

The invention also aims to provide a self-cleaning method of the gas water heater.

In order to realize the purpose of the invention, the invention adopts the following technical scheme:

according to one aspect of the invention, a self-cleaning system of a gas water heater is provided, and the self-cleaning system comprises a circulating pipeline, a water pump, an adding tank, a main water inlet valve, a controller, a WIFI module and a mobile device APP. The circulating pipeline comprises a cold-hot conversion pipeline and a cold water pipeline communicated with the cold-hot conversion pipeline through a one-way valve, wherein the cold-hot conversion pipeline comprises a cold water side and a hot water side communicated with the cold water side, and a cold water outlet and a hot water outlet which are controlled through a water outlet valve are arranged at the joint of the hot conversion pipeline and the cold water pipeline. The water pump is arranged on the cold water inlet side. The adding tank is arranged on the cold water inlet side and is communicated with the cold water pipeline through an electromagnetic valve. The main water inlet valve is arranged at the water inlet end of the circulating pipeline to control the on-off of the circulating pipeline and external water supply. The controller is used for controlling the one-way valve, the water pump and the electromagnetic valve. The WIFI module is arranged in the gas water heater and electrically connected with the controller. And the mobile device APP is in communication connection with the WIFI module.

According to an embodiment of the present invention, the mobile device APP is configured to set a dissolution ratio, a dissolution temperature, and a flushing soaking time, and the mobile device APP is provided with a self-cleaning operation step, which is communicated with the WIFI module to realize a step-by-step operation without field attendance.

According to another aspect of the invention, a self-cleaning method for a gas water heater is provided, which adopts the self-cleaning system for the gas water heater, and comprises the steps of closing a main water inlet valve of the gas water heater and opening a one-way valve; adding a scale remover into the addition tank; starting a self-cleaning function, enabling water to flow into the adding tank to dissolve the descaling agent, and starting a water pump to enable the descaling agent to circularly flow along with a circulating pipeline; the heating function of the gas water heater is turned on, and when the temperature of inlet water reaches the set dissolving temperature, the heating is stopped; in the scouring and soaking time, the water pump is started and stopped at intervals to scour and soak the circulating pipeline; after the flushing is finished, starting a reminding function and a drainage function; and after the drainage is finished, closing the water outlet valve and closing the self-cleaning function.

According to an embodiment of the present invention, wherein closing the main water inlet valve of the gas water heater and opening the check valve comprises: before self-cleaning, a main water inlet valve of the gas water heater is manually closed to avoid dilution and flowing away after a descaling agent is added; and opening the check valve so that the circulation line forms a water flow path flowing from the cold-heat conversion line to the cold water line.

According to an embodiment of the invention, wherein the adding of the descaling agent into the addition tank comprises: setting a dissolution ratio in the APP of the mobile device according to the type of the detergent; calculating the water flow speed by using a water flow sensor arranged in the circulating pipeline of the gas water heater, and further calculating the water storage capacity in the circulating pipeline; calculating the dosage of a dissolving agent according to the dissolving ratio and the water storage capacity; and adding the calculated amount of the dissolving agent to the addition tank.

According to an embodiment of the present invention, after the self-cleaning function of the gas water heater is started, the solenoid valve controlling the opening and closing of the addition tank is opened, water flows into the addition tank to dissolve the scale remover, the water pump in the circulation line is started to circulate the water in the circulation line, and thus the scale remover dissolved in the water flows in a circulation manner.

According to an embodiment of the invention, during the self-cleaning, the solenoid valve keeps the suction valve at all times, wherein the solenoid valve operates with reduced pressure to reduce the solenoid valve temperature rise.

According to one embodiment of the invention, the electromagnetic valve is a 24V brake electromagnetic valve, the electromagnetic valve is full of 24V and sucks the valve for 5s, then the voltage is reduced and maintained at 15V-18V, and the temperature rise of the electromagnetic valve is reduced.

According to an embodiment of the present invention, the set dissolution temperature is 60 ℃, and when the water inlet temperature of the gas water heater reaches 60 ℃, the gas water heater stops heating.

According to an embodiment of the present invention, the water pump is started for 1 minute to flush the circulation line, and then stopped for 1 minute to soak the circulation line, and the process is repeated for 30 minutes to fully dissolve the scale and prevent the scale from being deposited again.

According to an embodiment of the present invention, after the washing is completed, the starting of the reminding function and the draining function includes: after self-cleaning is finished, the water discharging function is reminded to be started through whole machine buzzing of the gas water heater or the APP of the mobile equipment; and opening the water outlet valve and the main water inlet valve, and starting the water pump to accelerate water drainage when water flow is detected.

According to an embodiment of the invention, after the drainage function is started for 3 minutes, the operator is reminded to switch the cold water outlet and the hot water outlet through the whole buzzer of the gas water heater or the APP of the mobile device; and

after the drainage function is started for 6 minutes, the operator is reminded to determine whether the discharged water has peculiar smell through the whole buzzer of the gas water heater or the APP of the mobile equipment.

According to an embodiment of the present invention, when the operator confirms that there is no odor in the discharged water, the outlet valve is closed, and then the self-cleaning function is turned off by detecting no water flow in the circulation line for 10 consecutive seconds.

One embodiment of the present invention has the following advantages or benefits:

the self-cleaning system of the gas water heater comprises a circulating pipeline, a water pump, an adding tank, a main water inlet valve, a controller, a WIFI module and a mobile device APP. The mobile device APP stores self-cleaning operation steps. The WIFI module is able to communicate with the mobile device APP to prompt the current operating step. The controller is connected with the WIFI module electricity in order to instruct the control action of controller. The self-cleaning can be realized by adding the descaling agent in the adding tank and then circulating in the circulating pipeline through the water pump, the operation is simple, the cleaning cost is reduced, and the field attendance is not needed.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

FIG. 1 is a schematic diagram of a gas water heater self-cleaning system shown according to an exemplary embodiment.

FIG. 2 is a partial schematic view of a gas water heater side of a gas water heater self-cleaning system shown in accordance with an exemplary embodiment.

FIG. 3 is a schematic diagram illustrating a method of self-cleaning a gas water heater, according to an exemplary embodiment.

Wherein the reference numerals are as follows:

1. a circulation line; 11. a cold-hot conversion pipeline; 111. a cold water side; 112. a hot water side; 12. a cold water line; 13. a one-way valve; 2. a water pump; 3. an addition tank; 4. an electromagnetic valve; 5. a main water inlet valve.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

The terms "a," "an," "the," "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

As shown in fig. 1 to 2, fig. 1 is a schematic diagram illustrating a self-cleaning system of a gas water heater provided by the invention. Fig. 2 shows a partial schematic side view of a gas water heater of a self-cleaning system of the gas water heater provided by the invention.

The self-cleaning system of the gas water heater comprises a circulating pipeline 1, a water pump 2, an adding tank 3, an electromagnetic valve 4, a main water inlet valve 5, a controller, a WIFI module and a mobile device APP. The circulation pipeline 1 comprises a cold-heat conversion pipeline 11 and a cold water pipeline 12 communicated with the cold-heat conversion pipeline 11 through a one-way valve 13, wherein the cold-heat conversion pipeline 11 comprises a cold water side 111 and a hot water side 112 communicated with the cold water side 111, and a cold water outlet and a hot water outlet controlled through a water outlet valve are arranged at the joint of the heat conversion pipeline 11 and the cold water pipeline 12. The water pump 2 is arranged on the cold water inlet side. The addition tank 3 is disposed on a cold water inlet side 11 and is communicated with a cold water pipeline 12 through an electromagnetic valve 4. The main water inlet valve 5 is arranged at the water inlet end of the circulating pipeline 1 to control the communication between the circulating pipeline 1 and external water supply. The controller is used for controlling the one-way valve 13, the water pump 2 and the electromagnetic valve 4. The WIFI module is arranged in the gas water heater and is electrically connected with the controller. Mobile device APP communication connection WIFI module. Mobile device APP is used for setting for dissolving than, setting for dissolving temperature and erode the soaking time to be provided with the automatically cleaning operation step on the mobile device APP through with WIFI module communication in order to realize that the substep operation need not on-the-spot on duty.

Wherein the circulation line 1 can form a closed circuit via the non-return valve 13. External water supply enters the circulating pipeline 1 through the main water inlet valve 5 and is divided into two paths. One of the streams flows through the cold water line 12 and out through the cold water outlet. One path of the hot water flows through the cold-hot conversion pipeline 11, flows into the cold water side 111, is heated by the gas water heater, and then becomes hot water which flows from the hot water side 112 to the hot water outlet and flows out. The water outlet valve can control the opening and closing of the cold water outlet and the hot water outlet. The mobile device APP is provided with operation steps in advance, the WIFI module can be utilized to prompt the mobile device APP to carry out corresponding steps through communication with the WIFI module, the mobile device APP prompts an operator to operate, and therefore field unattended operation is achieved. When the operator is near the gas water heater, the whole buzzer buzzes the whole gas water heater.

Fig. 3 shows a schematic diagram of a self-cleaning method for a gas water heater provided by the invention.

The self-cleaning method of the gas water heater of the embodiment of the invention adopts the self-cleaning system of the gas water heater, which comprises the following steps:

s1: closing a main water inlet valve 5 of the gas water heater and opening a one-way valve 13;

s2: adding a scale remover to the addition tank 3;

s3: starting a self-cleaning function to enable water to flow into the adding tank 3 to dissolve the scale remover, and starting the water pump 2 to enable the scale remover to circularly flow along with the circulating pipeline 1;

s4: the heating function of the gas water heater is turned on, and when the temperature of the inlet water reaches the set dissolving temperature, the heating is stopped;

s5: in the scouring and soaking time, the water pump 2 is started and stopped at intervals, and the circulating pipeline 1 is scoured and soaked;

s6: after the flushing is finished, starting a reminding function and a drainage function; and

s7: and after the drainage is finished, closing the water outlet valve and closing the self-cleaning function.

As shown in fig. 3, step S1 may implement the circulation line 1 to form a passage. Step S2 adds a scale remover to the addition tank 3 on the path for subsequent scale removal. In step S3, the self-cleaning tool is started, and the water pump 2 is started to introduce the scale remover into the water to circulate in the circulation line 1. Step S4 heats the cold water in the circulation line 1 to achieve complete melting of the descaling agent into the water. And step S5, starting and stopping the water pump 2 at intervals after the scale remover is completely melted, so as to realize the interval circulation of water, and the circulation of water scale washing and water scale soaking is carried out. In step S6, the scale is removed and discharged to the circulation line 1. Finally step S7 completes the self-cleaning function.

In a preferred embodiment of the present invention, closing the main water inlet valve 5 of the gas water heater and opening the check valve 13 comprises: before self-cleaning, the main water inlet valve 5 of the gas water heater is manually closed to avoid dilution and flowing away after the scale remover is added; and the check valve 13 is opened so that the circulation line 1 forms a water flow path from the cold-heat conversion line 11 to the cold water line 12.

As shown in fig. 3, before the self-cleaning function is used, a user is required to manually close the main water inlet valve 5 in the room where the gas water heater is located. So as to avoid the scale remover being diluted and not being able to fully dissolve the scale in the circulating pipeline 1. The detergent is prevented from flowing to other user households, and although harmless, the detergent can also cause peculiar smell.

In a preferred embodiment of the present invention, the addition of the detergent to the addition tank 3 comprises: setting a dissolution ratio in an APP of the mobile equipment according to the type of the scale remover; calculating the water flow speed by using a water flow sensor arranged in a circulating pipeline 1 of the gas water heater, and further calculating the water storage capacity in the circulating pipeline 1; calculating the dosage of the dissolving agent according to the dissolving ratio and the water storage capacity; and adding the calculated amount of the dissolving agent to the addition tank 3.

As shown in fig. 3, the dosage of detergent is automatically calculated by the program after the user sets the dissolution ratio on APP (the user sets the ratio according to the detergent solvent selected by the user). For example: the user dissolution ratio was set to 1: 50. The gas water heaters with the water pumps 2 are all provided with a cold water preheating function. When the user uses the water pipe preheating function, the program automatically calculates the water storage capacity of the pipeline. The calculation method is as follows: the gas water heater is provided with a water flow sensor and is used for starting and stopping control of the gas water heater (after the water flow is larger than the starting flow, ignition and combustion are carried out). The water flow speed aL/min of each second is obtained by the device, and the water flow speed aL/min/60) is multiplied by 1S to obtain the water flow (aL/min/1S) flowing in 1S. The hot water from the water outlet of the gas water heater is driven by the water pump 2 to flow back to the water inlet of the gas water heater. The water temperature is continuously reduced in the reflux process (heat exchange with cold water in the previous section, heat exchange with a pipeline and the like). When the temperature of the inlet water begins to rise, the hot water at the water outlet can be considered to flow back to the water inlet. In order to avoid misjudgment, the rising temperature is preferably set to be 2-3 ℃. At the moment, the accumulated calculation of the water flow in the pipeline is finished, and the water storage capacity of the pipeline is

For example, the water storage amount is 4L. Then, the dissolution ratio was set to 1:50 and the pipeline water storage capacity was 4L. The dosage of the dissolving agent X is 4000mL/50 is 80 g.

In a preferred embodiment of the present invention, after the self-cleaning function of the gas water heater is started, the electromagnetic valve 4 for controlling the opening and closing of the adding tank 3 is opened, the water flow flows into the adding tank 3 to dissolve the scale remover, the water pump 2 in the circulating pipeline 1 is started, so that the water flow in the circulating pipeline 1 circularly flows, and therefore the scale remover dissolved in the water flow also circularly flows.

As shown in fig. 1 to 3, the electromagnetic valve 4 is a normally closed electromagnetic valve, i.e., when not in use, the water inlet of the adding tank 3 is closed all the time, and the user can detach the adding tank 3 at any time without the trouble of first emptying the stored water and then detaching the stored water.

In a preferred embodiment of the invention, the solenoid valve 4 is kept suction valve all the way during self-cleaning, wherein the solenoid valve 4 is operated with reduced pressure to reduce the solenoid valve 4 temperature rise. The electromagnetic valve 4 is a 24V brake electromagnetic valve, the electromagnetic valve 4 is full of voltage and sucks the valve 5s at 24V, then the voltage is reduced and maintained at 15V-18V, and the temperature rise of the electromagnetic valve 4 is reduced.

Wherein, in order to fully dissolve the solvent in the adding tank 3, the electromagnetic valve 4 needs to keep the suction valve in the whole process during the self-cleaning period. I.e. the valve sucking time will be longer, and the temperature rise of the electromagnetic valve 4 needs to be fully considered.

In a preferred embodiment of the invention, the dissolving temperature is set to be 60 ℃, and when the inlet water temperature of the gas water heater reaches 60 ℃, the gas water heater stops heating.

As shown in figure 3, the water inlet temperature of the gas water heater is the set dissolving temperature, and when the water inlet temperature is greater than or equal to 60 ℃, the scale remover is fully dissolved.

In a preferred embodiment of the present invention, the water pump 2 is started for 1 minute to flush the circulation line 1, and then stopped for 1 minute to soak the circulation line 1, which is repeated for 30 minutes to sufficiently dissolve the scale and prevent the scale from being deposited again.

As shown in fig. 1 to 3, after heating, the gas water heater is locked, and ignition cannot be performed until the temperature of the inlet water is reduced to the bath set temperature. At this time, the water pump 2 is started for 1 minute, stopped for 1 minute and continuously rotated. The pipes were flushed and soaked for 30 minutes to allow the scale to dissolve sufficiently and flush the flow to prevent redeposition.

In a preferred embodiment of the present invention, after the washing is completed, the opening reminding function and the draining function include: after self-cleaning is finished, the water discharging function is reminded to be started through whole machine buzzing of the gas water heater or APP movement of the device; and opening the water outlet valve and the main water inlet valve 5, and starting the water pump 2 to accelerate the drainage when the water flow is detected. After the drainage function is started for 3 minutes, an operator is reminded to switch the cold water outlet and the hot water outlet through whole machine buzzing of the gas water heater or mobile equipment APP. After the drainage function is started for 6 minutes, an operator is reminded to confirm whether the discharged water has peculiar smell through whole machine buzzing of the gas water heater or mobile equipment APP.

In a preferred embodiment of the present invention, when the operator confirms that there is no odor in the discharged water, the outlet valve is closed, and then the self-cleaning function is turned off by detecting no water flow in the circulation line 1 for 10 consecutive seconds.

As shown in FIG. 3, the operator determines whether the detergent remains in the water by seeing that the color of the water has been smelled through the nose. A continuous 10s water-free flow may determine that the water has been emptied. Thus, the cleaning operation is finished.

The self-cleaning system of the gas water heater comprises a circulating pipeline 1, a water pump 2, an adding tank 3, a main water inlet valve 5, a controller, a WIFI module and a mobile device APP. The cleaning system adopts the cleaning method, wherein the mobile device APP stores self-cleaning operation steps. The WIFI module is able to communicate with the mobile device APP to prompt the current operating step. The controller is connected with the WIFI module electricity in order to instruct the control action of controller. Self-cleaning can be realized by adding a descaling agent in the adding tank 3 and then circulating in the circulating pipeline 1 through the water pump 2, the operation is simple, the cleaning cost is reduced, and field watching is not needed. The dissolution ratio, the heating temperature and the flushing time can be set and modified by a user. The method meets the requirements of users on different occasions of using the descaling agent, and has strong adaptability.

In embodiments of the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or units must have a specific direction, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the embodiments of the present invention.

In the description herein, the appearances of the phrase "one embodiment," "a preferred embodiment," or the like, are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present embodiment by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A gas water heater self-cleaning system, comprising:

the circulating pipeline (1) comprises a cold-heat conversion pipeline (11) and a cold water pipeline (12) communicated with the cold-heat conversion pipeline (11) through a one-way valve (13), wherein the cold-heat conversion pipeline (11) comprises a cold water side (111) and a hot water side (112) communicated with the cold water side (111), and a cold water outlet and a hot water outlet which are controlled through a water outlet valve are arranged at the joint of the heat conversion pipeline (11) and the cold water pipeline (12);

a water pump (2) arranged on the cold water inlet side (11);

the adding tank (3) is arranged on the cold water inlet side (11) and is communicated with the cold water pipeline (12) through an electromagnetic valve (4);

the main water inlet valve (5) is arranged at the water inlet end of the circulating pipeline (1) to control the communication between the circulating pipeline (1) and external water supply;

a controller for controlling the one-way valve (13), the water pump (2) and the solenoid valve (4);

the WIFI module is arranged in the gas water heater and is electrically connected with the controller; and

and the mobile device APP is in communication connection with the WIFI module.

2. The gas water heater self-cleaning system of claim 1, wherein the mobile device APP is configured to set a dissolution ratio, set a dissolution temperature and flush soak time, and the mobile device APP is provided with self-cleaning operation steps to achieve step-by-step operation without field attendance by communicating with the WIFI module.

3. A gas water heater self-cleaning method, characterized in that the gas water heater self-cleaning system of any one of claims 1 to 2 is adopted, the method comprises:

closing a main water inlet valve (5) of the gas water heater and opening a one-way valve (13);

adding a descaling agent into the adding tank (3);

starting a self-cleaning function, enabling water to flow into the adding tank (3) to dissolve the scale remover, and starting the water pump (2) to enable the scale remover to circularly flow along with the circulating pipeline (1);

the heating function of the gas water heater is turned on, and when the temperature of inlet water reaches the set dissolving temperature, the heating is stopped;

in the scouring and soaking time, the water pump (2) is started and stopped at intervals to scour and soak the circulating pipeline (1);

after the flushing is finished, starting a reminding function and a drainage function; and

and after the drainage is finished, closing the water outlet valve and closing the self-cleaning function.

4. Self-cleaning method for gas water heaters according to claim 3, characterized in that closing the main water inlet valve (5) of the gas water heater and opening the one-way valve (13) comprises:

before self-cleaning, the main water inlet valve (5) of the gas water heater is manually closed to avoid dilution and flowing away after the descaling agent is added; and

the check valve (13) is opened so that the circulation line (1) forms a water flow path from the cold-heat conversion line (11) to the cold water line (12).

5. A gas water heater self-cleaning method according to claim 3, characterized in that adding a detergent to the addition tank (3) comprises:

setting a dissolution ratio in the APP of the mobile device according to the type of the detergent;

calculating the water flow speed by using a water flow sensor arranged in the circulating pipeline (1) of the gas water heater, and further calculating the water storage capacity in the circulating pipeline (1);

calculating the dosage of a dissolving agent according to the dissolving ratio and the water storage capacity; and

adding the calculated amount of the dissolving agent to the addition tank (3).

6. The gas water heater self-cleaning method according to claim 3, characterized in that after the self-cleaning function of the gas water heater is started, the electromagnetic valve (4) controlling the adding tank (3) to open and close is opened, water flows into the adding tank (3) to dissolve the scale remover, and the water pump (2) in the circulating pipeline (1) is started to make the water flow in the circulating pipeline (1) circulate, so that the scale remover dissolved in the water flow also realizes the circulation flow.

7. Self-cleaning method for gas water heaters according to claim 6, characterized in that during self-cleaning the solenoid valve (4) keeps suction valve all the way, wherein the solenoid valve (4) operates with reduced pressure to reduce the temperature rise of the solenoid valve (4).

8. Self-cleaning method for gas water heaters according to claim 7, characterized in that the solenoid valve (4) is a 24V brake solenoid valve, the solenoid valve (4) is full of voltage 24V and is sucked for 5s, then the voltage is reduced and maintained at 15V-18V, and the temperature rise of the solenoid valve (4) is reduced.

9. The self-cleaning method for the gas water heater of claim 3, wherein the set dissolution temperature is 60 ℃, and when the inlet water temperature of the gas water heater reaches 60 ℃, the gas water heater stops heating.

10. A gas water heater self-cleaning method according to claim 3, characterized in that the water pump (2) is started for 1 minute to flush the circulation line (1) and then stopped for 1 minute to soak the circulation line (1) for 30 minutes to dissolve the scale sufficiently and prevent re-deposition.

11. The gas water heater self-cleaning method of claim 3, wherein the starting of the reminder function and the drain function after the completion of the flushing comprises:

after self-cleaning is finished, the water discharging function is reminded to be started through whole machine buzzing of the gas water heater or the APP of the mobile equipment; and

the water outlet valve and the main water inlet valve (5) are opened, and the water pump (2) is started to accelerate the drainage when the water flow is detected.

12. The gas water heater self-cleaning method of claim 11,

after the drainage function is started for 3 minutes, an operator is reminded to switch a cold water outlet and a hot water outlet through integral buzzing of the gas water heater or the mobile device APP; and

13. Self-cleaning method for gas water heaters according to claim 3, characterized in that when the operator confirms no peculiar smell in the discharged water, the outlet valve is closed, then the self-cleaning function is closed after detecting no water flow in the circulation line (1) for 10s continuously.