Control method and system of gas water heater, electronic device, storage medium

Abstract

The application discloses a control method and system of a gas water heater, an electronic device and a storage medium. The gas water heater comprises a water pump, a three-way electromagnetic valve and an internal circulation loop. The three-way electromagnetic valve comprises a water inlet valve port, a first water outlet valve port and a second water outlet valve port. The internal circulation loop comprises an internal hot water pipeline, an internal return water pipeline and an internal circulation pipeline. The control method comprises the following steps: controlling the first water outlet valve port to be closed and the second water outlet valve port to be opened; controlling the water pump to operate, so that the water in the external circulation loop is transported to the gas water heater through the internal return water pipeline by the water pump; starting the gas water heater to perform internal circulation heating, and the water heated by the internal circulation heating circulates in the internal circulation loop. The application sets the pipeline of the internal circulation loop for the water stored in the pipeline of the external circulation loop, so that the water is heated and the heated hot water is stored, and the hot water directly flows out when the water is boiled again.

Description

Technical Field

[0001] This invention relates to the field of gas water heater control, specifically to a control method and system for a gas water heater, electronic equipment, and storage medium. Background Technology

[0002] Currently, all gas water heaters on the market will initially produce a short period of cold water after water usage has ceased. This is because the water heater needs to detect water flow before igniting and burning. However, there is a time gap between when the user starts using water and when the water heater ignites, during which time the water hasn't had enough time to heat up. Existing gas water heaters lack an internal circulation loop, making it impossible to resolve the issue of cold water upon re-dispensing. This problem remains a major pain point in the industry. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defect in the prior art where cold water is discharged when the gas water heater stops heating and is reused, and to provide a control method and system, electronic equipment and storage medium for a gas water heater.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] Firstly, a control method for a gas water heater is provided. The gas water heater includes a water pump, a three-way solenoid valve, and an internal circulation loop. The three-way solenoid valve includes an inlet valve, a first outlet valve, and a second outlet valve. The internal circulation loop includes an internal hot water pipe, an internal return water pipe, and an internal circulation pipe. The inlet valve is connected to the internal hot water pipe, the first outlet valve is connected to the external circulation loop, the second outlet valve is connected to one end of the internal circulation pipe, the other end of the internal circulation pipe is connected to the internal return water pipe, the outlet of the water pump is connected to the internal return water pipe, and the inlet of the water pump is connected to the external circulation loop. The control method includes:

[0006] Control the first water outlet valve to close and the second water outlet valve to open;

[0007] The water pump is controlled to operate, and water in the external circulation loop is transported to the gas water heater through the internal return water pipe via the water pump.

[0008] The gas water heater is started to perform internal circulation heating, and the heated water circulates in the internal circulation loop.

[0009] Optionally, the step of controlling the first outlet valve to close and the second outlet valve to open specifically includes:

[0010] When the gas water heater meets the conditions for opening the internal circulation heating, the first water outlet valve is closed and the second water outlet valve is opened.

[0011] The conditions for activating the internal circulation heating include: the heating duration before the gas water heater stops heating is greater than a first preset duration and the duration after the gas water heater stops heating is less than a second preset duration; the inlet water temperature of the gas water heater is less than a preset inlet water temperature; and no water flow is detected at the water pump.

[0012] Optionally, the control method further includes:

[0013] When the gas water heater meets the conditions for ending the internal circulation heating, the internal circulation heating state is ended.

[0014] The conditions for ending the internal circulation heating include: the working time of the gas water heater in internal circulation heating is greater than a third preset time, the outlet water temperature of the gas water heater reaches the preset requirement, the gas water heater malfunctions, or the increase in the water flow of the gas water heater is greater than the preset water flow threshold.

[0015] Optionally, the gas water heater achieving a preset water outlet temperature includes:

[0016] When the set temperature of the gas water heater is greater than the preset temperature threshold, if the difference between the outlet water temperature of the gas water heater and the set temperature of the gas water heater is greater than the temperature difference threshold, it indicates that the outlet water temperature of the gas water heater has reached the preset requirement.

[0017] When the set temperature of the gas water heater is less than or equal to the preset temperature threshold, if the outlet water temperature of the gas water heater reaches the set temperature of the gas water heater, it indicates that the outlet water temperature of the gas water heater has reached the preset requirement.

[0018] Optionally, when the gas water heater meets the internal circulation heating termination condition (i.e., the operating time of the gas water heater in internal circulation heating exceeds a third preset time or the outlet water temperature of the gas water heater reaches a preset requirement), the control method further includes the following after ending the internal circulation heating state:

[0019] Turn off the gas water heater and keep the water pump running.

[0020] Optionally, after the internal circulation heating state ends, the control method further includes:

[0021] In response to the user's action of turning on the hot water, the gas water heater is controlled to turn on after a preset delay time.

[0022] Optionally, when the inlet water flow rate of the gas water heater is less than the first water flow rate threshold, the preset delay time is the first delay time;

[0023] When the inlet water flow rate of the gas water heater is greater than the second water flow rate threshold, the preset delay time is the second delay time;

[0024] When the inlet water flow rate of the gas water heater is greater than the first water flow rate threshold and less than the second water flow rate threshold, if L*(T1-T2)≥M, then the preset delay time is the first delay time; if L*(T1-T2)<M, then the preset delay time is the second delay time; where L represents the inlet water flow rate, T1 represents the set temperature of the gas water heater, T2 represents the inlet water temperature of the gas water heater, and M represents the preset threshold.

[0025] Secondly, a control system for a gas water heater is provided. The gas water heater includes a water pump, a three-way solenoid valve, and an internal circulation loop. The three-way solenoid valve includes an inlet valve, a first outlet valve, and a second outlet valve. The internal circulation loop includes an internal hot water pipe, an internal return water pipe, and an internal circulation pipe. The inlet valve is connected to the internal hot water pipe, the first outlet valve is connected to the external circulation loop, the second outlet valve is connected to one end of the internal circulation pipe, the other end of the internal circulation pipe is connected to the internal return water pipe, the outlet of the water pump is connected to the internal return water pipe, and the inlet of the water pump is connected to the external circulation loop. The control system includes:

[0026] The valve port control module is used to control the first outlet valve port to close and the second outlet valve port to open;

[0027] A water pump control module is used to control the operation of the water pump, and to transport water in the external circulation loop to the gas water heater through the internal return water pipe via the water pump.

[0028] The internal circulation start module is used to start the gas water heater for internal circulation heating, and the water heated by the internal circulation flows in the internal circulation loop.

[0029] Thirdly, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and for running on the processor, wherein the processor executes the computer program to implement the control method for the gas water heater described in any of the preceding claims.

[0030] Fourthly, a computer-readable storage medium is provided, on which a computer program is stored, characterized in that, when the computer program is executed by a processor, it implements the control method for a gas water heater as described in any of the preceding claims.

[0031] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0032] The positive and progressive effects of this invention are as follows: This invention sets up an internal circulation loop pipe for the water stored in the external circulation loop pipe, thereby heating and storing the heated hot water, ensuring that hot water flows out directly when the water is turned on again. Attached Figure Description

[0033] Figure 1 A flowchart of a control method for a gas water heater provided as an exemplary embodiment of the present invention;

[0034] Figure 2 A schematic diagram of the structure of a gas water heater provided as an exemplary embodiment of the present invention;

[0035] Figure 3 A flowchart illustrating another control method for a gas water heater provided as an exemplary embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of a control system for a gas water heater, as an exemplary embodiment of the present invention.

[0037] Figure 5 This is a structural diagram of an electronic device provided as an exemplary embodiment of the present invention. Detailed Implementation

[0038] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0039] This embodiment provides a control method for a gas water heater. For example... Figure 2 The gas water heater shown includes a water pump 201, a three-way solenoid valve 202, and an internal circulation circuit. The three-way solenoid valve includes an inlet valve 203, a first outlet valve 204, and a second outlet valve 205. The internal circulation circuit includes an internal hot water pipe 206, an internal return water pipe 207, and an internal circulation pipe 208. The inlet valve is connected to the internal hot water pipe, the first outlet valve is connected to the external circulation circuit, the second outlet valve is connected to one end of the internal circulation pipe, the other end of the internal circulation pipe is connected to the internal return water pipe, the outlet of the water pump is connected to the internal return water pipe, and the inlet of the water pump is connected to the external circulation circuit. The external circulation circuit includes an external hot water pipe 209, an external return water pipe 210, and an inlet pipe.

[0040] like Figure 1 As shown, the control method includes the following steps:

[0041] Step 101: Control the first water outlet valve to close and the second water outlet valve to open.

[0042] The three-way solenoid valve includes an inlet valve 203, a first outlet valve 204, and a second outlet valve 205. The inlet valve 203 is connected to the internal hot water pipe 206, the first outlet valve 204 is connected to the external circulation loop, and the second outlet valve 205 is connected to one end of the internal circulation pipe 208. When the first outlet valve 204 is open and the second outlet valve 205 is closed, the gas water heater is in the external circulation loop. When the first outlet valve 204 is closed and the second outlet valve 205 is open, the gas water heater is in the internal circulation loop.

[0043] In one embodiment, when the gas water heater meets the conditions for opening the internal circulation heating, the first outlet valve is closed and the second outlet valve is opened.

[0044] The conditions for activating internal circulation heating include:

[0045] (1) The internal circulation loop is activated;

[0046] (2) The gas water heater system did not malfunction;

[0047] (3) The gas water heater is on;

[0048] (4) The heating time before the gas water heater stops heating is greater than the first preset time and the heating time after the gas water heater stops heating is less than the second preset time;

[0049] (5) No water flow was detected at the water pump;

[0050] (6) The inlet water temperature of the gas water heater is lower than the preset inlet water temperature;

[0051] (7) The combustion operation of the gas water heater before it stops heating is not the combustion operation in the internal circulation loop;

[0052] (8) Set the temperature of the gas water heater to within the preset temperature, etc.

[0053] The internal circulation heating activation conditions can be set to one or more of the following: the activation conditions can be customized to suit the needs of the gas water heater used, without specific limitations. The first preset time refers to the combustion working time required before the gas water heater stops heating, and the second preset time refers to the combustion cessation time required after the gas water heater finishes combustion. Both the first and second preset times can be set according to the requirements of the gas water heater, without specific limitations.

[0054] Step 102: Control the water pump to operate, and use the water pump to transport water from the external circulation loop to the gas water heater through the internal return water pipe.

[0055] When the gas water heater activates its internal circulation heating mode, the first outlet valve 204 closes, the second outlet valve 205 opens, and the water pump 201 starts. Water from the external hot water pipe 209 flows to the external return water pipe 210 through a one-way valve. After the water pump starts, the water in the external circulation loop is activated by the water pump 201, causing the flow sensor to detect water flow. Once the flow sensor detects water flow, the gas water heater begins to burn and heat the water in the external circulation loop, which is supplied by the internal return water pipe.

[0056] In one embodiment, when the gas water heater is in the internal circulation loop heating mode, if the user suddenly uses water, there will be a pressure difference in the three-way solenoid valve. The water pressure will force open the first outlet valve, causing the gas water heater to switch from internal circulation loop combustion heating to external circulation loop combustion heating.

[0057] This embodiment allows water to flow out even when the gas water heater is in internal circulation heating mode and the user suddenly uses water.

[0058] Step 103: Start the gas water heater to perform internal circulation heating. The water heated by internal circulation flows in the internal circulation loop.

[0059] Once the conditions for turning on the gas water heater are met, the gas water heater will start to heat the water in the internal circulation mode. The water heated in the internal circulation mode will circulate in the internal circulation mode to ensure that there is no cold water.

[0060] In this embodiment, the water stored in the external circulation loop is heated and stored in the internal circulation loop pipe, so that hot water flows out directly when the water is turned on again.

[0061] In one embodiment, when the operating time of the gas water heater in internal circulation heating exceeds a third preset time, the gas water heater meets the internal circulation heating termination condition, thereby ending the internal circulation heating state of the gas water heater. The third preset time refers to the combustion operating time set for heating by the gas water heater. For example, the third preset time is 20 seconds. When the operating time of the gas water heater in internal circulation heating reaches 20 seconds, the operating time of the gas water heater in internal circulation heating meets the internal circulation heating termination condition, and at this time, the internal circulation heating state of the gas water heater ends.

[0062] In this embodiment, by setting a third preset duration, the working time of the internal circulation heating is compared with the third preset duration to determine whether the gas water heater has finished heating, thereby controlling the heating temperature of the gas water heater to be neither too high nor too low.

[0063] In one embodiment, when the outlet water temperature of the gas water heater reaches the preset requirement, the internal circulation heating termination condition is met, thereby ending the internal circulation heating state of the gas water heater; the preset requirement refers to the gas water heater's heating temperature exiting based on the set temperature of the gas water heater, thus indicating the outlet water temperature of the gas water heater when the internal circulation heating ends.

[0064] A preset temperature threshold is set according to the needs of the gas water heater itself. When the set temperature of the gas water heater is higher than the preset temperature threshold, if the difference between the outlet water temperature and the set temperature is greater than the temperature difference threshold, then the outlet water temperature of the gas water heater reaches the preset requirement. The temperature difference threshold refers to the set value of the difference between the outlet water temperature and the set temperature of the gas water heater. For example, if the preset temperature threshold is set to 45 degrees Celsius, and the temperature difference threshold between the outlet water temperature and the set temperature is 2 degrees Celsius, when the set temperature of the gas water heater is higher than 45 degrees Celsius, the outlet water temperature reaches 2 degrees Celsius higher than the set temperature, that is, the outlet water temperature of the gas water heater reaches the preset requirement, which meets the condition for ending the internal circulation heating, so the internal circulation heating state of the gas water heater ends.

[0065] When the set temperature of the gas water heater is less than or equal to the preset temperature threshold, if the outlet water temperature of the gas water heater reaches the set temperature, then the outlet water temperature of the gas water heater has reached the preset requirement. For example, if the preset temperature threshold is set to 45 degrees, when the set temperature of the gas water heater is less than or equal to 45 degrees, that is, the outlet water temperature of the gas water heater has reached the preset requirement, the internal circulation heating end condition is met, so the internal circulation heating state of the gas water heater ends.

[0066] This embodiment sets preset requirements and determines whether the gas water heater meets the internal circulation heating termination condition by judging whether the outlet water temperature of the gas water heater reaches the preset requirements, thus ensuring that the gas water heater can perform combustion heating normally under different conditions.

[0067] In one embodiment, when a gas water heater malfunctions, such as the gas water heater going out during use, the gas water heater issuing a dry-burning warning, or the gas water heater having excessively low pressure, the gas water heater meets the conditions for ending the internal circulation heating, thereby ending the internal circulation heating state of the gas water heater and shutting off the internal circulation loop of the gas water heater.

[0068] In this embodiment, by setting a condition that the gas water heater exits the internal circulation heating state when it malfunctions, the gas water heater malfunction can be detected and resolved in a timely manner.

[0069] In one embodiment, a preset water flow threshold is set according to the required flow rate of the gas water heater. When the increase in water flow rate exceeds the preset threshold, the gas water heater meets the internal circulation heating termination condition, ending the internal circulation heating state and entering an abnormal internal circulation exit state. The second outlet valve and water pump are then directly shut off, exiting the internal circulation loop. Setting the preset water flow threshold prevents a sudden increase in water flow while the gas water heater is heating and burning in the internal circulation loop. This allows the gas water heater to exit the internal circulation loop promptly, for example, if a user's water usage causes a sudden increase in water flow. For instance, if the preset water flow threshold is set to 1 L / min, and the increase in water flow rate exceeds 1 L / min, the gas water heater meets the internal circulation heating termination condition and ends its internal circulation heating state.

[0070] In this embodiment, by setting a preset water flow threshold, when the water flow of the gas water heater increases due to sudden water usage by the user or other circumstances, the heating state of the internal circulation loop is promptly exited and the internal circulation loop is exited.

[0071] In one embodiment, the gas water heater meets the condition for ending internal circulation heating when the internal circulation heating time exceeds a third preset time or the outlet water temperature reaches a preset requirement. After the gas water heater ends its internal circulation heating state, it needs to be turned off while the water pump continues to run. This is to even out the water temperature in the internal circulation loop, ensuring a balanced temperature and preventing variations in water temperature. The water evenness time is set according to the specific needs of the gas water heater. For example, if the evenness time for a 16L gas water heater is set to 8 seconds, the internal circulation loop can be shut off after 8 seconds of even water temperature.

[0072] In this embodiment, by agitating the water in the internal circulation loop of the gas water heater, the water temperature in the internal circulation loop is made uniform, avoiding uneven water temperature and thus improving the user experience.

[0073] In one embodiment, when a user turns on the hot water, the gas water heater is controlled to turn on after a preset delay time in response to the user's action. The preset delay time refers to the interval between when the user turns on the hot water and when the gas water heater turns on. The main purpose of setting the preset delay time is to avoid accidental triggering of the hot water turning-on action. Secondly, depending on the water flow rate, set temperature, and inlet water temperature of the gas water heater, modifying the preset delay time can effectively suppress the problem of temperature rise when the gas water heater stops supplying water. For example, when the water pump detects the water flow rate, the gas water heater may not start combustion heating for 2 to 3 seconds before resuming combustion heating.

[0074] To ensure the reliability and accuracy of the internal circulation of the gas water heater, detailed tests were conducted for different water flow rates and set temperatures to obtain a highly accurate software algorithm. When the inlet water flow rate of the gas water heater is less than a first water flow rate threshold, a preset delay time is set to the first delay time; when the inlet water flow rate of the gas water heater is greater than a second water flow rate threshold, the preset delay time is set to the second delay time; when the inlet water flow rate of the gas water heater is greater than the first water flow rate threshold but less than the second water flow rate threshold, if L*(T1-T2)≥M, the preset delay time is the first delay time; if L*(T1-T2)<M, the preset delay time is the second delay time. For example: setting the first water flow rate threshold to L1 (liters / minute) and the second water flow rate threshold to L2 (liters / minute), when the inlet water flow rate of the gas water heater is small... For L1 (liters / minute), the first delay time is set to t1 seconds; when the inlet water flow of the gas water heater is greater than L2 (liters / minute), the second delay time is t2 seconds; when the inlet water flow of the gas water heater is greater than L1 (liters / minute) and less than L2 (liters / minute), if L*(T1-T2)≥M, the preset delay time is t1 seconds, and if L*(T1-T2)<M, the preset delay time is t2 seconds. The specific values ​​of t1 and t2 can be set according to actual needs; where L represents the inlet water flow, T1 represents the set temperature of the gas water heater, T2 represents the inlet water temperature of the gas water heater, and M represents the preset threshold.

[0075] This embodiment avoids accidental triggering of the user's action to turn on the hot water by setting a preset extension time. Secondly, by modifying the preset delay time according to the different water flow, set temperature and inlet water temperature of the gas water heater, the problem of temperature rise when the gas water heater stops can be effectively suppressed.

[0076] This embodiment modifies the structure of the gas water heater, constructs an internal circulation loop, and controls the three-way solenoid valve and water pump to achieve the function of no cold water when the gas water heater outputs water. The internal circulation loop function control of the gas water heater is implemented using a dynamic machine approach, which subdivides the entry, execution, and exit conditions of the internal circulation to ensure better operation of the internal circulation loop and improve the user experience. It also intelligently processes the exit conditions before the end of the internal circulation and the preset delay time when water is used again after the internal circulation loop ends.

[0077] In this embodiment, the water stored in the external circulation loop is heated and stored in the internal circulation loop pipe, so that hot water flows out directly when the water is turned on again.

[0078] like Figure 3 The present invention also provides a flowchart of another control method for a gas water heater.

[0079] Step 301: Determine whether the system is in a waiting state for the internal circulation loop to open. If yes, control the water pump to shut down. If no, proceed to step 305.

[0080] Step 302: Control the first water outlet valve to open and the second water outlet valve to close;

[0081] Step 303: Determine whether the conditions for starting the inner loop have been met. If yes, proceed to step 304; otherwise, end the process.

[0082] Step 304: Enter the internal circulation loop open state;

[0083] Step 305: Determine whether the internal circulation loop is open. If yes, control the water pump to shut down. If no, proceed to step 309.

[0084] Step 306: Close the first water outlet valve and open the second water outlet valve;

[0085] Step 307: Determine if the duration reaches 1 second. If yes, proceed to step 308; otherwise, proceed to step 328.

[0086] Step 308: Enter the internal circulation loop heating state;

[0087] Step 309: Determine whether the internal circulation loop is in heating mode. If yes, control the water pump to start. If no, proceed to step 315.

[0088] Step 310: Close the first water outlet valve and open the second water outlet valve;

[0089] Step 311: Determine whether the internal circulation heating termination condition has been met. If yes, proceed to step 312; otherwise, proceed to step 313.

[0090] Step 312: Enter the internal circulation loop and the water is evenly mixed;

[0091] Step 313: Determine whether the abnormal exit condition of the internal circulation heating has been met. If yes, proceed to step 314; otherwise, proceed to step 328.

[0092] Step 314: Entering the abnormal exit state of the inner loop;

[0093] Step 315: Determine whether the water is in the internal circulation loop and evenly mixed. If yes, control the water pump to start. If no, proceed to step 319.

[0094] Step 316: Close the first water outlet valve and open the second water outlet valve;

[0095] Step 317: Determine whether the water in the inner circulation loop is evenly mixed. If yes, proceed to step 318; otherwise, proceed to step 328.

[0096] Step 318: Enter the closed state of the internal circulation loop;

[0097] Step 319: Determine if the internal circulation loop is in an abnormal exit state. If yes, control the water pump to shut down. If no, proceed to step 323.

[0098] Step 320: Control the first water outlet valve to open and the second water outlet valve to close;

[0099] Step 321: Determine if the duration reaches 1 second. If yes, proceed to step 322; otherwise, proceed to step 328.

[0100] Step 322: Enter the closed state of the internal circulation loop;

[0101] Step 323: Determine whether the internal circulation loop is closed. If yes, control the water pump to shut down. If no, proceed to step 328.

[0102] Step 324: Determine if the water flow rate at the pump is 0. If yes, proceed to step 325; otherwise, proceed to step 327.

[0103] Step 325: Control the first water outlet valve to open and the second water outlet valve to close;

[0104] Step 326: Enter the waiting state for the inner loop to open;

[0105] Step 327: Close the first water outlet valve and open the second water outlet valve;

[0106] Step 328, End.

[0107] The internal circulation loop function control of the gas water heater is implemented using a state machine, which provides detailed control over the entry, execution, and exit conditions of the internal circulation loop. The state machine determines the normal operation of the gas water heater's internal circulation loop, including: State 0: Waiting for the internal circulation loop to start; State 1: Internal circulation loop started; State 2: Internal circulation loop heating; State 3: Water is evenly mixed in the internal circulation loop; State 4: Internal circulation loop abnormally exits; State 5: Internal circulation loop is closed.

[0108] The normal operation of the internal circulation function transitions as follows: State 0: Waiting for the internal circulation loop to start, the three-way solenoid valve is closed and the water pump is off → State 1: Internal circulation loop starts, the three-way solenoid valve is open and the water pump is off → State 2: Internal circulation loop is heating, the three-way solenoid valve is open and the water pump is on → State 3: Internal circulation loop is water-mixing, the three-way solenoid valve is open and the water pump is on → State 5: Internal circulation loop stops, the three-way solenoid valve is closed and the water pump is off → State 0: Waiting for the internal circulation loop to start, the three-way solenoid valve is closed and the water pump is off. If a user uses water during State 3, the system will transition to State 4: Internal circulation loop malfunctions and exits, the three-way solenoid valve is closed and the water pump is off → State 5: Internal circulation loop stops, the three-way solenoid valve is closed and the water pump is off → State 0: Waiting for the internal circulation loop to start, the three-way solenoid valve is closed and the water pump is off.

[0109] This embodiment provides a control system for a gas water heater. The gas water heater includes a water pump, a three-way solenoid valve, and an internal circulation loop. The three-way solenoid valve includes an inlet valve, a first outlet valve, and a second outlet valve. The internal circulation loop includes an internal hot water pipe, an internal return water pipe, and an internal circulation pipe. The inlet valve is connected to the internal hot water pipe, the first outlet valve is connected to the external circulation loop, the second outlet valve is connected to one end of the internal circulation pipe, the other end of the internal circulation pipe is connected to the internal return water pipe, the water pump outlet is connected to the internal return water pipe, and the water pump inlet is connected to the external circulation loop. Figure 4 As shown, the control system includes:

[0110] Valve port control module 401 is used to control the first outlet valve port to close and the second outlet valve port to open.

[0111] The water pump control module 402 is used to control the operation of the water pump, which transports water from the external circulation loop to the gas water heater through the internal return water pipe.

[0112] The internal circulation start module 403 is used to start the gas water heater for internal circulation heating, and the water heated by internal circulation flows in the internal circulation loop.

[0113] Optionally, the valve port control module 401 is specifically used for:

[0114] The internal circulation control module is used to control the first outlet valve to close and the second outlet valve to open when the gas water heater meets the internal circulation heating start conditions.

[0115] The conditions for activating internal circulation heating include: the heating time before the gas water heater stops heating is greater than the first preset time and the time after the gas water heater stops heating is less than the second preset time; the inlet water temperature of the gas water heater is less than the preset inlet water temperature; and no water flow is detected at the water pump.

[0116] Optionally, the control system also includes:

[0117] The internal circulation termination module is used to terminate the internal circulation heating state when the gas water heater meets the internal circulation heating termination conditions.

[0118] The conditions for ending internal circulation heating include: the working time of the gas water heater in internal circulation heating is greater than the third preset time, the outlet water temperature of the gas water heater reaches the preset requirement, the gas water heater malfunctions, or the increase in the water flow of the gas water heater is greater than the preset water flow threshold.

[0119] Optionally, the inner loop termination module includes:

[0120] The first characterization unit is used to characterize the gas water heater's outlet temperature as reaching the preset requirement if the difference between the gas water heater's outlet temperature and the gas water heater's set temperature is greater than the temperature difference threshold when the set temperature of the gas water heater is greater than the preset temperature threshold.

[0121] The second characterization unit is used to characterize that the outlet water temperature of the gas water heater has reached the preset requirement when the set temperature of the gas water heater is less than or equal to the preset temperature threshold.

[0122] Optionally, the control system also includes:

[0123] The water pump operation module is used to shut down the gas water heater while controlling the water pump to continue running.

[0124] Optionally, the control system also includes:

[0125] The water heater control module is used to respond to the user's action of turning on the hot water and control the gas water heater to turn on after a preset delay time.

[0126] Optionally,

[0127] The first preset module is used to preset a delay time of the first delay time when the inlet water flow of the gas water heater is less than the first water flow threshold.

[0128] The second preset module is used to preset the delay time to the second delay time when the inlet water flow of the gas water heater is greater than the second water flow threshold.

[0129] The third preset module is used to set the preset delay time as the first delay time when the inlet water flow of the gas water heater is greater than the first water flow threshold and less than the second water flow threshold. If L*(T1-T2)≥M, the preset delay time is the second delay time. Wherein, L represents the inlet water flow, T1 represents the set temperature of the gas water heater, T2 represents the inlet water temperature of the gas water heater, and M represents the preset threshold.

[0130] For the system embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The system embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of the present invention according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0131] Figure 5 This is a schematic diagram of an electronic device provided as an exemplary embodiment of the present invention. The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements an exemplary control method for a gas water heater. Figure 5 The electronic device 50 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of the present invention.

[0132] like Figure 5 As shown, the electronic device 50 can be manifested in the form of a general-purpose computing device, such as a server device. The components of the electronic device 50 may include, but are not limited to: at least one processor 51, at least one memory 52, and a bus 53 connecting different system components (including memory 52 and processor 51).

[0133] Bus 53 includes a data bus, an address bus, and a control bus.

[0134] The memory 52 may include volatile memory, such as random access memory (RAM) 521 and / or cache memory 522, and may further include read-only memory (ROM) 523.

[0135] The memory 52 may also include a program / utility 525 having a set (at least one) of program modules 524, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0136] The processor 51 executes various functional applications and data processing by running computer programs stored in the memory 52, such as the control method of the exemplary gas water heater of the present invention.

[0137] Electronic device 50 can also communicate with one or more external devices 54. This communication can be made via input / output (I / O) interface 55. Furthermore, the model-generated device 50 can also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via network adapter 56. As shown, network adapter 56 communicates with other modules of the model-generated electronic device 50 via bus 53. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the model-generated electronic device 50, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems.

[0138] It should be noted that although several units / modules or sub-units / modules of the electronic device have been mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to embodiments of the present invention, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided and embodied by multiple units / modules.

[0139] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a control method for an exemplary gas water heater according to an embodiment of this invention.

[0140] The readable storage medium may be more specifically adopted, including but not limited to: portable disk, hard disk, random access memory, read-only memory, erasable programmable read-only memory, optical storage device, magnetic storage device, or any suitable combination thereof.

[0141] In a possible implementation, the present invention can also be implemented as a program product comprising program code, which, when the program product is run on a terminal device, causes the terminal device to execute a control method for an exemplary gas water heater according to an embodiment of the present invention.

[0142] The program code for executing the present invention can be written in any combination of one or more programming languages. The program code can be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on a remote device.

[0143] It should be understood that in the specific embodiments of the present invention, the terms "first" and "second" serve only as a distinction and do not have any substantial meaning.

[0144] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention 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 invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A control method for a gas water heater, characterized in that, The gas water heater includes a water pump, a three-way solenoid valve, and an internal circulation loop. The three-way solenoid valve includes an inlet valve, a first outlet valve, and a second outlet valve. The internal circulation loop includes an internal hot water pipe, an internal return water pipe, and an internal circulation pipe. The inlet valve is connected to the internal hot water pipe, the first outlet valve is connected to the external circulation loop, the second outlet valve is connected to one end of the internal circulation pipe, and the other end of the internal circulation pipe is connected to the internal return water pipe. The outlet of the water pump is connected to the internal return water pipe, and the inlet of the water pump is connected to the external circulation loop. The external circulation loop includes an external hot water pipe, an external return water pipe, and an inlet pipe. The control method includes: Control the first water outlet valve to close and the second water outlet valve to open; The water pump is controlled to operate, the first outlet valve is opened and the second outlet valve is closed, and the water in the external circulation loop is transported to the gas water heater through the internal return pipe by the water pump. The gas water heater is started to perform internal circulation heating, and the heated water circulates in the internal circulation loop.

2. The control method for a gas water heater as described in claim 1, characterized in that, The step of controlling the first water outlet valve to close and the second water outlet valve to open specifically includes: When the gas water heater meets the conditions for opening the internal circulation heating, the first water outlet valve is closed and the second water outlet valve is opened. The conditions for activating the internal circulation heating include: the heating duration before the gas water heater stops heating is greater than a first preset duration and the duration after the gas water heater stops heating is less than a second preset duration; the inlet water temperature of the gas water heater is less than a preset inlet water temperature; and no water flow is detected at the water pump.

3. The control method for a gas water heater as described in claim 1, characterized in that, The control method further includes: When the gas water heater meets the conditions for ending the internal circulation heating, the internal circulation heating state is ended. The conditions for ending the internal circulation heating include: the working time of the gas water heater in internal circulation heating is greater than a third preset time, the outlet water temperature of the gas water heater reaches the preset requirement, the gas water heater malfunctions, or the increase in the water flow of the gas water heater is greater than the preset water flow threshold.

4. The control method for a gas water heater as described in claim 3, characterized in that, The gas water heater achieving the preset water outlet temperature includes: When the set temperature of the gas water heater is greater than the preset temperature threshold, if the difference between the outlet water temperature of the gas water heater and the set temperature of the gas water heater is greater than the temperature difference threshold, it indicates that the outlet water temperature of the gas water heater has reached the preset requirement. When the set temperature of the gas water heater is less than or equal to the preset temperature threshold, if the outlet water temperature of the gas water heater reaches the set temperature of the gas water heater, it indicates that the outlet water temperature of the gas water heater has reached the preset requirement.

5. The control method for a gas water heater as described in claim 3, characterized in that, When the gas water heater meets the internal circulation heating termination condition (i.e., the operating time of the gas water heater in internal circulation heating exceeds a third preset time or the outlet water temperature of the gas water heater reaches a preset requirement), then after ending the internal circulation heating state, the control method further includes: Turn off the gas water heater and keep the water pump running.

6. The control method for a gas water heater as described in claim 3, characterized in that, After the internal circulation heating state ends, the control method further includes: In response to the user's action of turning on the hot water, the gas water heater is controlled to turn on after a preset delay time.

7. The control method for a gas water heater as described in claim 6, characterized in that, When the inlet water flow rate of the gas water heater is less than the first water flow rate threshold, the preset delay time is the first delay time; When the inlet water flow rate of the gas water heater is greater than the second water flow rate threshold, the preset delay time is the second delay time; When the inlet water flow rate of the gas water heater is greater than the first water flow rate threshold and less than the second water flow rate threshold, if L*(T1-T2)≥M, then the preset delay time is the first delay time; if L*(T1-T2)<M, then the preset delay time is the second delay time; where L represents the inlet water flow rate, T1 represents the set temperature of the gas water heater, T2 represents the inlet water temperature of the gas water heater, and M represents the preset threshold.

8. A control system for a gas water heater, characterized in that, The gas water heater includes a water pump, a three-way solenoid valve, and an internal circulation loop. The three-way solenoid valve includes an inlet valve, a first outlet valve, and a second outlet valve. The internal circulation loop includes an internal hot water pipe, an internal return water pipe, and an internal circulation pipe. The inlet valve is connected to the internal hot water pipe, the first outlet valve is connected to the external circulation loop, the second outlet valve is connected to one end of the internal circulation pipe, and the other end of the internal circulation pipe is connected to the internal return water pipe. The outlet of the water pump is connected to the internal return water pipe, and the inlet of the water pump is connected to the external circulation loop. The external circulation loop includes an external hot water pipe, an external return water pipe, and an inlet pipe. The control system includes: The valve port control module is used to control the first outlet valve port to close and the second outlet valve port to open; A water pump control module is used to control the operation of the water pump, control the opening of the first water outlet valve and the closing of the second water outlet valve, and use the water pump to transport water in the external circulation loop to the gas water heater through the internal return water pipe. The internal circulation start module is used to start the gas water heater for internal circulation heating, and the water heated by the internal circulation flows in the internal circulation loop.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and for running on the processor, characterized in that, When the processor executes the computer program, it implements the control method for the gas water heater according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the control method for the gas water heater according to any one of claims 1 to 7.

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