Method, system, device, medium for back cleaning of a gas water heater

Abstract

The application discloses a kind of gas water heater's rear cleaning method, system, equipment, medium, response gas water heater's flameout signal, obtain the last speed of fan, according to last speed, obtain the first target speed corresponding to first preset time period and the second target speed corresponding to second preset time period, then control fan runs at first target speed in first preset time period and control fan runs at second target speed in second preset time period to complete rear cleaning, the rear cleaning method disclosed in the application can quickly remove tail gas and gas after gas water heater is closed, and reduce residual temperature, reduce manual intervention, improve the efficiency of removing tail gas and gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas water heaters, in particular to a gas water heater post-cleaning method, system, device and medium. BACKGROUND

[0002] After the gas water heater product is burned, the tail gas formed by the gas or the gas that does not participate in the combustion is prone to be retained in the machine. In the prior art, without the influence of pressure difference, it will not be discharged along the flue, and the next time the ignition may form a deflagration phenomenon, or spread to the outside of the machine. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the defect that the tail gas formed by combustion or the gas that does not participate in combustion is prone to be retained in the machine and cannot be discharged in time in the prior art, and to provide a gas water heater post-cleaning method, system, device and medium.

[0004] The present application solves the above technical problems by the following technical solutions:

[0005] The present application provides a gas water heater post-cleaning method, comprising:

[0006] responding to the flameout signal of the gas water heater;

[0007] obtaining the last rotation speed of the fan; the last rotation speed is the rotation speed of the fan at the last time before the flameout;

[0008] According to the last rotation speed, a first target rotation speed corresponding to a first preset time period is obtained;

[0009] controlling the fan to operate at the first target rotation speed within the first preset time period;

[0010] and controlling the fan to operate at a second target rotation speed within a second preset time period;

[0011] The first preset time period is a period of time after the machine is extinguished, and the second preset time period is a period of time after the first preset time period.

[0012] Preferably, the first target rotation speed corresponding to the first preset time period is obtained according to the last rotation speed, comprising:

[0013] determining whether the last rotation speed is less than or equal to a preset rotation speed;

[0014] If the last rotation speed is less than or equal to the preset rotation speed, a first preset rotation speed is obtained as the first target rotation speed;

[0015] If the last rotation speed is greater than the preset rotation speed, a second preset rotation speed is obtained as the first target rotation speed;

[0016] The first preset rotating speed is less than the second preset rotating speed, and the second target rotating speed is less than the first and second preset rotating speeds.

[0017] Preferably, before the control of the operation of the fan at the second target rotating speed in the second preset time period, the method further comprises:

[0018] If the water flow signal is detected in the first preset time period and the water flow signal still exists after the first preset time period, the subsequent steps are stopped, and the gas water heater is ignited.

[0019] Preferably, the control of the operation of the fan at the second target rotating speed in the second preset time period comprises:

[0020] If the water flow signal is detected in the second preset time period, the operation of the fan is stopped, and the gas water heater is ignited.

[0021] Preferably, before the acquisition of the last rotating speed of the fan, the method further comprises:

[0022] If the water flow signal still exists,

[0023] the subsequent steps are directly stopped, a corresponding fault is reported, and the fan is controlled to operate at the second preset rotating speed in the first preset time period and to operate at the second target rotating speed in the second preset time period.

[0024] Preferably, after the control of the operation of the fan at the second target rotating speed in the second preset time period, the method further comprises:

[0025] The gas water heater is controlled to enter a standby state.

[0026] The application also provides a post-cleaning system of a gas water heater, which comprises:

[0027] An extinguishing response module for responding to an extinguishing signal of the gas water heater; a rotating speed acquisition module for acquiring a last rotating speed of the fan; the last rotating speed is a rotating speed of the fan at a last time point before extinguishing;

[0028] A target rotating speed acquisition module for acquiring a first target rotating speed corresponding to a first preset time period according to the last rotating speed;

[0029] A first fan control module for controlling the operation of the fan at the first target rotating speed in the first preset time period;

[0030] A second fan control module for controlling the operation of the fan at a second target rotating speed in a second preset time period.

[0031] Preferably, the rear cleaning system of the gas water heater comprises:

[0032] A water flow detection module is configured to detect the water flow in real time.

[0033] Preferably, the target rotating speed acquisition module comprises:

[0034] A final rotating speed judgment module is configured to judge whether the final rotating speed is less than or equal to a preset rotating speed.

[0035] A first preset rotating speed acquisition module is configured to acquire the first preset rotating speed as the first target rotating speed if the final rotating speed is less than or equal to the preset rotating speed.

[0036] A second preset rotating speed acquisition module is configured to acquire the second preset rotating speed as the first target rotating speed if the final rotating speed is greater than the preset rotating speed; the first preset rotating speed is less than the second preset rotating speed, and the second target rotating speed is less than the first and second preset rotating speeds.

[0037] Preferably, the second fan control module comprises:

[0038] An ignition stopping module is configured to stop the subsequent steps and ignite the gas water heater if the water flow signal is detected within the first preset time period and the water flow signal still exists after the first preset time period.

[0039] Preferably, the rotating speed acquisition module comprises:

[0040] A fault reporting module is configured to directly stop the subsequent steps, report the corresponding fault, and control the fan to operate at the second preset rotating speed within the first preset time period and operate at the second target rotating speed within the second preset time period if the water flow signal still exists.

[0041] Preferably, the second fan control module comprises:

[0042] A standby control module is configured to wait for the completion of the rear cleaning of the gas water heater and control the gas water heater to enter a standby state.

[0043] The application further provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and used for running on the processor, wherein the processor implements the rear cleaning method of the gas water heater according to any one of the above.

[0044] The application further provides a computer readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the rear cleaning method of the gas water heater according to any one of the above.

[0045] The positive progress effect of the present application is that the present application discloses a gas water heater post-cleaning method, system, equipment and medium, in response to the flameout signal of the gas water heater, the last speed of the fan is obtained, according to the last speed, the first target speed corresponding to the first preset time period and the second target speed corresponding to the second preset time period are obtained, and then the fan is controlled to run at the first target speed within the first preset time period and the fan is controlled to run at the second target speed within the second preset time period to complete the post-cleaning, realize the exhaust of tail gas and fuel gas, and reduce the residual temperature, reduce the manual intervention, and improve the exhaust efficiency of tail gas and fuel gas. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 The flowchart of the gas water heater post-cleaning method of the present application embodiment 1.

[0047] Figure 2 The flowchart of step S103 of the gas water heater post-cleaning method of the present application embodiment 2.

[0048] Figure 3 The flowchart of another embodiment of the gas water heater post-cleaning method of the present application embodiment 2.

[0049] Figure 4 The flowchart of another embodiment of the gas water heater post-cleaning method of the present application embodiment 2.

[0050] Figure 5 The module schematic diagram of the gas water heater post-cleaning system of the present application embodiment 3.

[0051] Figure 6 The schematic diagram of the target speed acquisition module of the gas water heater post-cleaning system of the present application embodiment 4.

[0052] Figure 7 The schematic diagram of the second fan control module of the gas water heater post-cleaning system of the present application embodiment 4.

[0053] Figure 8 The structure schematic diagram of the electronic equipment of the present application embodiment 5. DETAILED DESCRIPTION

[0054] The present application will be further described below by way of examples, but the present application is not limited in the scope of the examples.

[0055] Embodiment 1

[0056] The present embodiment provides a gas water heater post-cleaning method, as shown in the figure, comprising the following steps: Figure 1

[0057] ​S101, in response to the gas water heater off signal.

[0058] When the gas water heater is normally combusting, after receiving the gas water heater off signal, in response to the gas water heater off signal, generally the water flow stops, and the gas water heater is turned off.

[0059] S102, obtain the last speed of the fan; the last speed is the fan speed at the last time before the off.

[0060] After the gas water heater is turned off, the last speed of the fan is obtained, which refers to the fan speed at the last time before the gas water heater is turned off, that is, the next time of the last time, the gas water heater is turned off in response to the off signal.

[0061] S103, according to the last speed, obtain the first target speed corresponding to the first preset time period.

[0062] The first target speed is used for the fan to run according to the first target speed for post-cleaning in the first preset time period.

[0063] The first preset time period is a time period preset according to business requirements, which is used to indicate that the first target speed runs in a fixed time period. The first preset time period can be t seconds. The first preset time period is related to the state of the water heater itself. If the heat dissipation of the water heater is slow, the water in the water heater will continue to heat up after the water is stopped and the machine is turned off, which may cause the risk of scalding. Therefore, in this case, the first preset time period needs to be longer. If the heat dissipation is fast, the temperature will drop faster when the cold water comes in next time. At this time, the first preset time period is shorter to prevent taking away more heat. Wherein, t can be 5-30 seconds, for example, according to business requirements, t is equal to 10, at this time, the first target speed corresponding to the first preset time period is obtained.

[0064] S104, control the fan to run at the first target speed in the first preset time period.

[0065] Based on the first target speed, the gas water heater controls the fan to run at the first target speed in the first preset time period for the post-cleaning of the gas water heater in the first preset time period. The cleaning in the first preset time period is usually the effect of strong wind force and rapid increase of air pressure to quickly remove gas. The first target speed can be A%Nmax, wherein A% is a preset weight, which can be determined according to the load curve. The higher the load, the greater the speed. Generally, A% is 70%, or 100%. Wherein Nmax is the maximum speed of the gas water heater when it is combusting normally.

[0066] S105, and control the fan to run at the second target speed in the second preset time period.

[0067] Based on the second target rotating speed, the gas water heater controls the fan to run at the second target rotating speed within a second preset time period to perform the second preset time period of the gas water heater after cleaning.

[0068] The second target rotating speed is used for the fan to run at the second target rotating speed within the second preset time period to perform the after cleaning.

[0069] The second preset time period is also a time period preset according to the business requirement, which is used to indicate that the second target rotating speed runs within a fixed time period. The second preset time period is set to further perform the after cleaning, and also to prevent the noise from being too large when the fan is always used at a high rotating speed. The low rotating speed within the second preset time period can be more acceptable to the user. According to the business requirement, the second preset time period should be greater than the first time period. The second preset time period can be k seconds. When the gas water heater is slow to dissipate heat, only the first preset time period needs to be set, and the after cleaning in the second preset time period is not needed. When the gas water heater dissipates heat fast, a shorter first preset time period is set to prevent the existence of blockages. After the after cleaning according to the first preset time period, the after cleaning in the second preset time period is performed. The k seconds of the second preset time period can be 25-55 seconds. For example, according to the business requirement, k is equal to 20. At this time, the second target rotating speed corresponding to the second preset time period of twenty seconds is obtained.

[0070] Generally, t is less than k, which is to prevent the waiting time from being too long next time, and also to fully clean the tail gas and fuel gas. t+k is usually 30-60 seconds.

[0071] The second target rotating speed is B%Nmax, wherein B% is a preset weight, which can be determined according to the load curve. The higher the load, the greater the rotating speed, and B% can be 50%. Generally, A>B.

[0072] The first preset time period is a period of time after the machine is extinguished, and the second preset time period is a period of time after the first preset time period.

[0073] The embodiment discloses a method for after cleaning of a gas water heater. In response to an extinguishing signal of the gas water heater, the last rotating speed of the fan is obtained. According to the last rotating speed, the first target rotating speed corresponding to the first preset time period is obtained. The fan is controlled to run at the first target rotating speed within the first preset time period, and the fan is controlled to run at the second target rotating speed within the second preset time period to complete the after cleaning. The air pressure is rapidly increased for a short time within the first preset time period to discharge the tail gas and fuel gas. Within the second preset time period, the fan runs at a relatively slow rotating speed to continuously discharge the tail gas and fuel gas, and also does not generate large noise and reduce the residual temperature. The manual intervention is reduced, and the efficiency of discharging the tail gas and fuel gas is improved.

[0074] Embodiment 2

[0075] In an implementable scheme, asFigure 2 As shown, step S103, obtaining the first target rotational speed corresponding to the first preset time period based on the last rotational speed, specifically includes:

[0076] S1031. Determine whether the final rotation speed is less than or equal to the preset rotation speed.

[0077] Based on the final rotational speed, the first target rotational speed corresponding to the first preset time period is obtained. The preset rotational speed can be A%Nmax, where A% is a preset weight, which can be determined according to the load curve. The higher the load, the higher the rotational speed. Generally, A% is taken as 70%. Nmax is the maximum rotational speed that the fan can reach when the gas water heater is in maximum combustion.

[0078] S1032. If the final rotational speed is less than or equal to the preset rotational speed, then the first preset rotational speed is obtained as the first target rotational speed. Preferably, the first preset rotational speed is equal to the preset rotational speed.

[0079] If the final rotation speed is less than or equal to the preset rotation speed, it means that before the water heater shuts off, the fan speed and proportional valve current are relatively low, and the heat released is not high. At the same time, there is less exhaust gas and unburned gas produced. Therefore, after cleaning is performed according to A%Nmax. At this time, the first preset rotation speed is used as the first target rotation speed. The first preset rotation speed can be A%Nmax. This can completely exhaust the exhaust gas and unburned gas, and also dissipate excess heat to prevent burns caused by excessive temperature rise due to unexhausted exhaust gas or unburned gas and excess heat during the next ignition.

[0080] S1033. If the final rotational speed is greater than the preset rotational speed, then the second preset rotational speed is obtained as the first target rotational speed; the first preset rotational speed is less than the second preset rotational speed, and the second target rotational speed is less than the first and second preset rotational speeds.

[0081] When the final speed exceeds the preset speed, it indicates that the gas water heater fan speed and proportional valve current were relatively high before the flameout, and the released heat was also relatively high. At the same time, there was a lot of exhaust gas and unburned gas produced. Therefore, the post-purge cannot be performed according to A%Nmax. In this case, the second preset speed is used as the first target speed, where the second preset speed can be Nmax. This can completely expel the exhaust gas and unburned gas, and also dissipate excess heat to prevent burns caused by excessive temperature rise due to unexhausted exhaust gas or unburned gas and excess heat during the next ignition.

[0082] In a feasible solution, such as Figure 3 As shown, before step S105 controls the fan to run at the second target speed during the second preset time period, it includes:

[0083] S1050, if the water flow signal is detected in the first preset time period and the water flow signal still exists after the first preset time period, then the subsequent steps are stopped, and the gas water heater is ignited.

[0084] The water flow signal is continuously detected during the combustion of the gas water heater and the post-cleaning process of the gas water heater. Before the fan is controlled to operate at the second target speed for the second preset time period, if the water flow signal is detected in the first preset time period and the water flow signal still exists after the first preset time period, it indicates that the water flow generation time is relatively long, and the user has a water demand. Therefore, it is necessary to stop controlling the fan to operate at the second target speed for the second preset time period, and at this time, it indicates that the gas water heater can be ignited.

[0085] In another optional embodiment, as shown in Figure 4 S105, the step further comprises:

[0086] S1051, if the water flow signal is detected in the second preset time period, the fan is stopped, and the water heater is ignited.

[0087] While the fan is controlled to operate at the second target speed for the second preset time period, it is detected whether there is a water flow signal in the second preset time period. If the water flow signal is detected in the second preset time period, it indicates that the user only temporarily closes the water flow. At this time, because the fan has been operated at the first target speed for the first preset time period to discharge heat and tail gas, the fan can be directly stopped, indicating that the gas water heater can be ignited.

[0088] In an embodiment, before step S102, it comprises:

[0089] If the water flow signal still exists, the subsequent steps are directly stopped, a corresponding fault is reported, and the fan is controlled to operate at the second preset speed for the first preset time period and at the second target speed for the second preset time period.

[0090] Before obtaining the last speed of the fan, the gas water heater is extinguished in response to the extinguishing signal. It is detected whether there is a water flow signal. If the water flow signal still exists at this time, it indicates that the gas water heater is extinguished with the water flow signal. This step conflicts with the control logic of the gas water heater, indicating that the gas water heater has a fault. Therefore, the subsequent steps are directly stopped, a corresponding fault is reported, and at this time, the residual heat and tail gas still need to be discharged. Therefore, the fan needs to be controlled to operate at the second preset speed for the first preset time period and at the second target speed for the second preset time period. The second preset speed and the second target speed can be the same as the limitations in Embodiment 1.

[0091] In an implementable solution, after step S105, further comprising:

[0092] The gas water heater enters a standby state.

[0093] After controlling the fan to run at the second target rotating speed for the second preset time period, the post-cleaning of the gas water heater is completed, at this time, the gas water heater can be controlled to enter a standby state, and the next ignition will not form a deflagration phenomenon or spread to the outside of the machine.

[0094] Embodiment 3

[0095] The embodiment provides a post-cleaning system 300 of a gas water heater, such as Figure 5 The post-cleaning system 300 of the gas water heater comprises:

[0096] An extinguishing response module 301, configured to respond to an extinguishing signal of the gas water heater;

[0097] A rotating speed acquisition module 302, configured to acquire a last rotating speed of the fan; the last rotating speed is a fan rotating speed at a last time point before extinguishing;

[0098] A target rotating speed acquisition module 303, configured to acquire a first target rotating speed corresponding to a first preset time period according to the last rotating speed;

[0099] A first fan control module 304, configured to control the fan to run at the first target rotating speed for the first preset time period;

[0100] A second fan control module 305, configured to control the fan to run at a second target rotating speed for a second preset time period.

[0101] The first target rotating speed is used for the fan to run at the first target rotating speed for post-cleaning in the first preset time period. The first preset time period is a time period preset according to a business requirement, and is used for indicating that the first target rotating speed runs in a fixed time period.

[0102] The first fan control module 304 controls the fan to run at the first target rotating speed for the first preset time period, and performs post-cleaning of the gas water heater in the first preset time period. The cleaning in the first preset time period is usually strong wind force and rapid increase of air pressure to rapidly remove gas. The first target rotating speed can be A%Nmax, wherein A% is a preset weight, A% can be determined according to a load curve, the higher the load, the greater the rotating speed, and A% is generally taken as 70%, or can be 100%, and Nmax is the maximum rotating speed when the gas water heater is in maximum combustion.

[0103] The second fan control module 305 is configured to control the fan to operate at a second target rotating speed in a second preset time period, wherein the second target rotating speed is used to operate the fan at the second target rotating speed in the second preset time period for post-cleaning. The second preset time period is also a time period preset according to business requirements, and is used to indicate that the second target rotating speed operates in a fixed time period. The second preset time period is set to further perform post-cleaning, and also to prevent the noise from being too loud when the fan is always used at a high rotating speed. The second preset time period can be b seconds, for example, b is equal to 20 according to business requirements. At this time, the second target rotating speed corresponding to the second preset time period of twenty seconds is obtained.

[0104] Generally, a is less than b, which is to prevent the next ignition waiting time from being too long, and also to sufficiently clean the exhaust gas and fuel gas.

[0105] The second target rotating speed is B%Nmax, wherein B% is a preset weight, which can be determined according to a load curve. The higher the load, the greater the rotating speed, and B% can be 50%.

[0106] The first preset time period is a period of time after the machine is extinguished, and the second preset time period is a period of time after the first preset time period.

[0107] The post-cleaning system of the gas water heater provided in the embodiment can obtain the first target rotating speed corresponding to the first preset time period by using the last rotating speed of the fan, control the fan to operate at the first target rotating speed in the first preset time period, and control the fan to operate at the second target rotating speed in the second preset time period to complete post-cleaning. The exhaust gas and fuel gas are discharged by rapidly increasing the air pressure for a short time in the first preset time period, and the exhaust gas and fuel gas are continuously discharged at a slow rotating speed in the second preset time period. Moreover, the system does not produce large noise and reduce the residual temperature, reduces manual intervention, and improves the exhaust gas and fuel gas efficiency.

[0108] Embodiment 4

[0109] In an optional embodiment, as shown in Figure 5 The post-cleaning system 300 of the gas water heater further comprises:

[0110] The water flow detection module 306 is configured to detect the water flow in real time.

[0111] When the water flow detection module detects the water flow, the system can control the post-cleaning program differently according to different time periods. For example, the water flow signal is detected in the first preset time period, and the water flow signal still exists after the first preset time period. Then, the subsequent steps are stopped, and the gas water heater is ignited.

[0112] In an optional embodiment, as shown inFigure 6 As shown in the figure, the target rotating speed obtaining module 303 comprises:

[0113] The last rotating speed judging module 3031 is configured to judge whether the last rotating speed is less than or equal to a preset rotating speed.

[0114] The first preset rotating speed obtaining module 3032 is configured to, if the last rotating speed is less than or equal to the preset rotating speed, obtain a first preset rotating speed as the first target rotating speed.

[0115] The second preset rotating speed obtaining module 3033 is configured to, if the last rotating speed is greater than the preset rotating speed, obtain a second preset rotating speed as the first target rotating speed; the first preset rotating speed is less than the second preset rotating speed, and the second target rotating speed is less than the first and second preset rotating speeds.

[0116] In an optional embodiment, as shown in the figure, the second fan control module 305 comprises: Figure 7

[0117] The ignition stopping module 3051 is configured to, if the water flow detection module 306 detects the water flow signal within the first preset time period, and the water flow signal still exists after the first preset time period, stop the subsequent steps and ignite the gas water heater.

[0118] In an optional embodiment, the rotating speed obtaining module 302 comprises:

[0119] The fault reporting module is configured to, if the flameout response module 301 responds to the flameout signal of the gas water heater and the water flow detection module 306 still detects the water flow signal, directly stop the subsequent steps, report the corresponding fault, and control the fan to operate at the second preset rotating speed within the first preset time period and operate at the second target rotating speed within the second preset time period.

[0120] In an optional embodiment, as shown in the figure, the second fan control module 305 comprises: Figure 7

[0121] The standby control module 3052 is configured to wait for the completion of the post-cleaning of the gas water heater and control the gas water heater to enter a standby state.

[0122] Embodiment 5

[0123] The embodiment provides an electronic device, Figure 8 which is a schematic diagram of modules of the electronic device. The electronic device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the post-cleaning method of the gas water heater of embodiment 1 and the post-cleaning method of the gas water heater of embodiment 2 when executing the program. Figure 8 The electronic device 30 shown is merely an example and should not impose any limitation on the functions and use range of the embodiments of the present application. ​​

[0124] As shown in Figure 8 Electronic device 30 can be in the form of a general purpose computing device, such as a server device. Components of electronic device 30 can include, but are not limited to, at least one processor 31 as described above, at least one memory 32 as described above, and a bus 33 that connects different system components, including the memory 32 and the processor 31.

[0125] Bus 33 includes a data bus, an address bus, and a control bus.

[0126] Memory 32 can include volatile memory, such as random access memory (RAM) 321 and / or cache memory 322, and can further include non-volatile memory, such as read only memory (ROM) 323.

[0127] Memory 32 can also include a program / utility 325 having a set of program modules 324, including but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which can include implementation of a network environment, individually or in some combination.

[0128] Processor 31 can execute instructions, for example, the method for cleaning the gas water heater after use according to embodiment 1 and the method for cleaning the gas water heater after use according to embodiment 2, stored in memory 32 to perform various functions, including the processing of data.

[0129] Electronic device 30 can also communicate with one or more external devices 34 such as a keyboard or a pointing device, through input / output (I / O) interface 35. And, electronic device 30 can communicate with one or more networks, such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet, through network adapter 36. As shown in Figure 8 Network adapter 36 can communicate with other modules of electronic device 30 through bus 33. It should be appreciated that although not shown, other hardware and / or software modules could be used in conjunction with electronic device 30. Such as, but not limited to, microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data archival storage systems, etc.

[0130] It should be noted that although several units / modules or sub-units / modules of the electronic device are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, according to an embodiment of the application, the features and functionalities of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functionalities of one unit / module described above can be further divided into embodied by a plurality of units / modules.

[0131] Embodiment 6

[0132] The embodiment provides a computer readable storage medium, and a computer program is stored on the computer readable storage medium. The program is executed by a processor to implement the method for cleaning the gas water heater according to the embodiment 1 and the method for cleaning the gas water heater according to the embodiment 2.

[0133] More specifically, the readable storage medium can include, but is not limited to, a portable disc, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0134] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A method of back purging a gas water heater, the method comprising: introducing a purge gas into the gas water heater; and purging the gas water heater of the purge gas. The method comprises: responding to an extinguishing signal of a gas water heater; acquiring a last rotation speed of a fan, the last rotation speed being a rotation speed of the fan at a last time before extinguishing; acquiring a first target rotation speed corresponding to a first preset time period according to the last rotation speed; controlling the fan to operate at the first target rotation speed within the first preset time period; controlling the fan to operate at a second target rotation speed within a second preset time period; the first preset time period is a period of time after the machine is extinguished, and the second preset time period is a period of time after the first preset time period; the acquiring of the first target rotation speed corresponding to the first preset time period according to the last rotation speed specifically comprises: judging whether the last rotation speed is less than or equal to a preset rotation speed; if the last rotation speed is less than or equal to the preset rotation speed, acquiring a first preset rotation speed as the first target rotation speed; if the last rotation speed is greater than the preset rotation speed, acquiring a second preset rotation speed as the first target rotation speed; the first preset rotation speed is less than the second preset rotation speed, and the second target rotation speed is less than the first preset rotation speed and the second preset rotation speed; before the acquiring of the last rotation speed of the fan, the method further comprises: if the water flow signal still exists, directly stopping subsequent steps, reporting a corresponding fault, and controlling the fan to operate at a second preset rotation speed within the first preset time period and to operate at the second target rotation speed within the second preset time period.

2. The method of claim 1, wherein the gas water heater is a condensing type gas water heater. before the controlling of the fan to operate at the second target rotation speed within the second preset time period, the method further comprises: if a water flow signal is detected within the first preset time period and the water flow signal still exists after the first preset time period, stopping subsequent steps and igniting the gas water heater.

3. The method of claim 1, wherein the gas water heater is a condensing type gas water heater. the controlling of the fan to operate at the second target rotation speed within the second preset time period further comprises: if a water flow signal is detected within the second preset time period, stopping the operation of the fan and igniting the gas water heater.

4. The method of claim 1, wherein the gas water heater is a condensing type gas water heater. after the controlling of the fan to operate at the second target rotation speed within the second preset time period, the method further comprises: controlling the gas water heater to enter a standby state.

5. A rear cleaning system for a gas water heater, the system comprising: The method comprises: an extinguishing response module for responding to an extinguishing signal of a gas water heater; a rotation speed acquisition module for acquiring a last rotation speed of a fan, the last rotation speed being a rotation speed of the fan at a last time before extinguishing; a target rotation speed acquisition module for acquiring a first target rotation speed corresponding to a first preset time period according to the last rotation speed; a first fan control module for controlling the fan to operate at the first target rotation speed within the first preset time period; a second fan control module for controlling the fan to operate at a second target rotation speed within a second preset time period; the target rotation speed acquisition module comprises: a last rotation speed judgment module for judging whether the last rotation speed is less than or equal to a preset rotation speed; a first preset rotation speed acquisition module for acquiring the first preset rotation speed as the first target rotation speed if the last rotation speed is less than or equal to the preset rotation speed; The second preset rotating speed acquisition module is configured to acquire the second preset rotating speed as a first target rotating speed if the last rotating speed is greater than the preset rotating speed; the first preset rotating speed is less than the second preset rotating speed, and the second target rotating speed is less than the first and second preset rotating speeds. The rotating speed acquisition module comprises: The fault reporting module is configured to directly stop the subsequent steps, report a corresponding fault, and control the fan to operate at a second preset rotating speed for a first preset time period and operate at a second target rotating speed for a second preset time period if the water flow signal still exists.

6. The rear cleaning system of the gas water heater according to claim 5, characterized in that, The water flow detection module is further configured to detect the water flow in real time.

7. An electronic device comprising a memory, a processor, and a computer program stored on the memory for running on the processor, characterized in that, The processor executes the computer program to implement the rear cleaning method of the gas water heater according to any one of claims 1-4.

8. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the rear cleaning method of the gas water heater according to any one of claims 1-4.

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