Gas water heater preheating control method and device and gas water heater

Abstract

The application relates to a gas water heater preheating control method and device and a gas water heater, and comprises the following steps: in the case of non-first preheating in a continuous preheating mode, if the outlet water temperature of the water heater is less than or equal to a first preset temperature threshold value within a continuous preset time, a circulating water pump is started to circulate water in a circulating water circuit, and a heating unit remains in a shutdown state; the first preset temperature threshold value is less than a set temperature; if the inlet water temperature of the water heater is greater than or equal to a target temperature threshold value within the continuous preset time, or the cumulative circulating water flow is greater than or equal to a first preset water flow threshold value, the circulating water pump remains in a running state, the heating unit is started to heat the water, and the process is continued until a single preheating end condition is met. In the continuous preheating mode, the distribution of cold and hot water in the circulating water circuit is accurately identified through temperature characteristics or flow characteristics, and after the cold water section is excluded, the hot water section is heated and treated in circulation, so that the gas consumption of the water heater can be effectively saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a gas water heater preheating control method and device and a gas water heater. BACKGROUND

[0002] With the development of gas water heater technology, zero-cold-water gas water heaters with preheating function have become the mainstream model in the market because they can preheat the cold water in the circulating pipeline, realizing instant heating and no need to wait for cold water when the user takes a bath. The zero-cold-water function needs to heat the cold water in the circulating pipeline, so the gas consumption is higher than that of a conventional gas water heater. Therefore, the industry proposes a half-pipe energy-saving preheating control scheme, which only heats the hot water pipeline actually used by the user to avoid heating the cold water pipeline, so as to shorten the preheating time and reduce gas consumption.

[0003] However, the existing half-pipe energy-saving preheating control scheme has various drawbacks, such as low accuracy when collecting the total flow of the circulating water pipeline. There is a significant delay in preheating termination, causing additional heating and wasting gas. When the gas water heater is continuously preheated, it may mistakenly heat the cold water section that was not heated in the previous cycle, wasting gas. SUMMARY

[0004] Therefore, it is necessary to provide a gas water heater preheating control method and device and a gas water heater that can accurately identify the hot water section and the cold water section in the circulating water pipeline, effectively reduce the working time of the zero-cold-water gas water heater in continuous preheating, and effectively save gas consumption.

[0005] In a first aspect, the present application provides a gas water heater preheating control method, comprising:

[0006] In the case of non-first preheating in the continuous preheating mode, if the water outlet temperature of the water heater is less than or equal to a first preset temperature threshold within a continuous preset time, start the circulating water pump to circulate the water in the circulating water pipeline, and the heating unit remains in a stopped state; the first preset temperature threshold is less than the set temperature;

[0007] If the water inlet temperature of the water heater is greater than or equal to a target temperature threshold, or the cumulative circulating water flow is greater than or equal to a first preset water flow threshold, within a continuous preset time, the circulating water pump remains in an operating state, and the heating unit is started to heat the water until a single preheating termination condition is met.

[0008] In one of the embodiments, the method further comprises:

[0009] In the case of first preheating in the continuous preheating mode, if the water outlet temperature is less than or equal to the first preset temperature threshold within a continuous preset time, start the heating unit to heat the water, and start the circulating water pump to circulate the water in the circulating water pipeline until a single preheating termination condition is met.

[0010] In one of the embodiments, the method further comprises:

[0011] The single preheating end condition is determined to be met in any of the following conditions:

[0012] First, the outlet water temperature is greater than or equal to a second preset temperature threshold value and the return water temperature of the water heater is greater than a preset temperature threshold value for a continuous preset time; wherein the second preset temperature threshold value is greater than the set temperature;

[0013] Second, the return water temperature of the water heater is greater than or equal to the target temperature threshold value and the preheating heating time is greater than or equal to a preset time threshold value for a continuous preset time; wherein the preheating heating time is the duration of the heating unit in the running state;

[0014] Third, the cumulative preheating circulating water flow is greater than or equal to a second preset water flow threshold value; wherein the second preset water flow threshold value is greater than or equal to the first preset water flow threshold value.

[0015] In one of the embodiments, the method further comprises:

[0016] In the case of the first preheating of the continuous preheating mode or the continuous preheating mode debugging event, the total water flow of the circulating water circuit is obtained;

[0017] The first preset water flow threshold value and the second preset water flow threshold value are determined according to the total water flow.

[0018] In one of the embodiments, the total water flow of the circulating water circuit is obtained, comprising:

[0019] The cumulative instantaneous water flow from the first time to the second time is recorded to obtain the total water flow; wherein the first time is the starting time of the heating unit, and the second time is the time when the inlet water temperature is greater than or equal to the target temperature threshold value for a continuous preset time.

[0020] In one of the embodiments, the total water flow of the circulating water circuit is obtained, further comprising:

[0021] If the outlet water temperature is less than the target temperature threshold value at the water pump starting time, and the user does not perform the water taking action from the first time to the second time, the total water flow is obtained according to the cumulative instantaneous water flow recorded from the first time to the second time;

[0022] If the outlet water temperature is greater than or equal to the target temperature threshold value at the water pump starting time, or the user performs the water taking action from the first time to the second time, the total water flow is obtained according to the cumulative instantaneous water flow recorded from the first time to the second time and a preset correction amount.

[0023] In one embodiment, the method further comprises:

[0024] determining the second preset water flow threshold according to the total water flow and water taking point information of the last time the user performed a water taking action before the current time.

[0025] In a second aspect, the application further provides a gas water heater preheating control device, comprising:

[0026] a cold water section identification module, configured to, in a case of non-first preheating in a continuous preheating mode, if the outlet water temperature of the water heater is less than or equal to a first preset temperature threshold within a continuous preset time, start a circulating water pump to circulate the water in the circulating water circuit, and keep the heating unit in a stopped state; the first preset temperature threshold is less than the set temperature.

[0027] a heating control module, configured to, if the inlet water temperature of the water heater is greater than or equal to a target temperature threshold within a continuous preset time, or the cumulative circulating water flow is greater than or equal to a first preset water flow threshold, keep the circulating water pump in a running state, start the heating unit to heat the water, and keep heating until a single preheating end condition is met.

[0028] In one embodiment, the heating control module is specifically configured to, in a case of first preheating in the continuous preheating mode, if the outlet water temperature is less than or equal to the first preset temperature threshold within a continuous preset time, start the heating unit to heat the water, start the circulating water pump to circulate the water in the circulating water circuit, and keep heating until the single preheating end condition is met.

[0029] In a third aspect, the application further provides a gas water heater, comprising a circulating water pump, a circulating water circuit, a heating unit, an inlet water temperature sensor, an outlet water temperature sensor, a flow sensor and a controller, wherein the controller is connected to the circulating water pump, the heating unit, the inlet water temperature sensor, the outlet water temperature sensor and the flow sensor respectively.

[0030] The controller is configured to execute the steps of the gas water heater preheating control method of the first aspect.

[0031] In summary, this application proposes a preheating control method, device, and gas water heater for a gas water heater, comprising: in a continuous preheating mode (not the initial preheating), if the outlet water temperature of the water heater is less than or equal to a first preset temperature threshold within a continuous preset time, starting the circulating water pump to circulate the water in the circulating water circuit, while the heating unit remains off; the first preset temperature threshold is less than a set temperature; if the inlet water temperature of the water heater is greater than or equal to a target temperature threshold within a continuous preset time, or the cumulative circulating water flow rate is greater than or equal to a first preset water flow rate threshold, the circulating water pump remains running, and the heating unit is started to heat the water until the conditions for the end of a single preheating cycle are met. In continuous preheating mode, this application accurately identifies the distribution of hot and cold water in the circulating water circuit through temperature or flow characteristics, and after removing the cold water section, circulates and heats the hot water section, effectively saving gas consumption of the water heater. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of a gas water heater in one embodiment;

[0033] Figure 2 This is a flowchart illustrating a gas water heater preheating control method in one embodiment;

[0034] Figure 3 This is a flowchart illustrating the preheating control method for a gas water heater in another embodiment;

[0035] Figure 4 This is a structural block diagram of a gas water heater preheating control device in one embodiment;

[0036] Figure 5 This is an internal structural diagram of a computer device in one embodiment.

[0037] Summary of attached image labels:

[0038] Hot water section - 111; Cold water section - 112; Flow sensor - 120; Inlet water temperature sensor - 130; Outlet water temperature sensor - 140; Heating unit - 150; Circulating water pump - 160; Check valve - 170. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0040] In one embodiment, such as Figure 1As shown, a gas water heater is provided, comprising a circulating water circuit, a circulating water pump 160, a heating unit 150, a water inlet temperature sensor 130, a water outlet temperature sensor 140, a flow sensor 120 and a controller, the controller is connected to the circulating water pump 160, the heating unit 150, the water inlet temperature sensor 130, the water outlet temperature sensor 140 and the flow sensor 120 respectively.

[0041] In this embodiment, the gas water heater is a gas water heater with zero cold water function. By heating the water in the circulating water circuit in advance, the user can take hot water at the water taking point without waiting for heating, realizing the use experience of instant heating.

[0042] In this embodiment, the circulating water circuit refers to the relevant water circuit connecting the household cold water inlet, the user water taking point, the gas water heater water inlet, the internal and the water outlet for water circulation. The circulating water circuit at least includes a hot water section water circuit 111, a cold water section water circuit 112 and a heating section water circuit. For example, Figure 1 As shown, the hot water section water circuit 111 refers to the water circuit from the water outlet of the gas water heater to the user water taking point, for example, A1 to A2 part of the water circuit. The cold water section water circuit 112 refers to the water circuit from the household cold water inlet to the user water taking point, for example, B1 to B2 part and B2 to B3 part of the water circuit. The heating section water circuit refers to the water circuit that the heating unit 150 of the gas water heater adjusts the temperature of the water in the water circuit, for example, C1 to C2 part of the water circuit.

[0043] In this embodiment, the heating unit 150 is arranged in the gas water heater to heat the water in the heating section water circuit and adjust the water to the set temperature. In this embodiment, the set temperature is the target temperature that the gas water heater needs to heat. The setting method of the set temperature is not limited in this embodiment, which can be determined according to the actual application scene. For example, the user can set the set temperature by operating the operation panel of the water heater, or complete the setting of the set temperature of the water heater through the application program on the mobile terminal. The user can determine the actual value of the set temperature according to the actual application needs.

[0044] In the embodiment, the number of water taking points connected to the circulating water path can be determined according to the installation of the water pipe in the actual application scene, and the water path system provided in the embodiment includes at least one water taking point. In the case where the water path system includes multiple water taking points, the gas water heater provided in the embodiment can adaptively adjust the related parameter threshold in the preheating control program according to the setting position of the water taking point. In the embodiment, a one-way valve 170 can be arranged at the connection between the water taking point farthest from the water outlet of the gas water heater and the circulating water path, or a corresponding one-way valve 170 can be arranged at the connection between each water taking point and the circulating water path, to ensure that the water in the hot water pipe can flow to the cold water pipe, and the water in the cold water pipe cannot flow to the hot water pipe in the backwater pipe.

[0045] In the embodiment, the gas water heater includes a gas valve, a cold water valve and a hot water valve. The gas valve is arranged at the gas inlet of the gas water heater and is used to control the on-off of the gas pipe. The cold water valve is arranged at the water inlet of the gas water heater and is used to control the on-off of the pipe connecting the circulating pipe and the water inlet of the gas water heater. The hot water valve is arranged at the water outlet of the gas water heater and is used to control the on-off of the pipe connecting the circulating pipe and the water outlet of the gas water heater. It should be noted that the gas valve, the cold water valve and the hot water valve can be determined according to the actual type of the gas water heater in the actual application scene.

[0046] In the embodiment, the gas water heater is internally provided with a flow sensor 120, a water inlet temperature sensor 130, a water outlet temperature sensor 140, a heating unit 150 and a circulating water pump 160. The water inlet temperature sensor 130 is arranged at the position where the water inlet of the gas water heater is connected to the cold water pipe, and the water outlet temperature sensor 140 is arranged at the position where the water outlet of the gas water heater is connected to the hot water pipe. The flow sensor 120 is arranged at the pipe between the heating unit 150 and the water inlet of the gas water heater, to effectively count the circulating water flow. The circulating water pump 160 is arranged at any position of the water pipe inside the gas water heater, for example, between the heating unit 150 and the water inlet of the gas water heater. The circulating water pump 160 is used to provide power for the water in the circulating water path, so that the water flows in the specified direction.

[0047] It should be noted that the specific types of the flow sensor 120, the temperature sensor, the heating unit 150 and the circulating water pump 160 are not limited in the embodiment, and elements with accurate detection and driving capabilities can be selected according to the needs of the actual application scene to execute the corresponding control program.

[0048] In the embodiment, the controller is configured to execute the gas water heater preheating control method provided in the following embodiments to accurately identify the cold water section and the hot water section in the circulating water path of the gas water heater in the continuous cycle preheating condition, and to cycle heat the water in the hot water section through the delay heating control to save the gas consumption of the gas water heater and avoid the gas water heater from heating the water with a lower temperature, thereby avoiding unnecessary gas waste.

[0049] In one embodiment, as shown in Figure 2 , a gas water heater preheating control method is provided, which is applied to the controller of the gas water heater in Figure 1 , and includes the following steps:

[0050] S201, in the case of non-first preheating in the continuous preheating mode, if the outlet water temperature of the water heater is less than or equal to a first preset temperature threshold within a continuous preset time, the circulating water pump is started to circulate the water in the circulating water path, and the heating unit remains in a stopped state.

[0051] In the embodiment, the controller of the gas water heater is internally provided with a corresponding continuous preheating mode related control program. In the continuous preheating mode, the gas water heater performs multiple preheating functions according to the water temperature in the circulating water path to ensure that the user can take hot water at the water taking point and use it immediately without waiting for the water to be heated. It should be noted that in the embodiment, the gas water heater enters the continuous preheating mode, and the first heating condition and the non-first heating condition are distinguished. The first heating condition refers to the application scenario of performing the preheating function for the first time. The non-first heating condition refers to the application scenario of maintaining the continuous preheating mode and performing the preheating function to maintain the water temperature in the hot water section of the circulating water path.

[0052] In the embodiment, in the case that the gas water heater is in the continuous preheating mode, the controller monitors the water state in the circulating water path in real time through the inlet water temperature sensor, the outlet water temperature sensor and the flow sensor to obtain the outlet water temperature of the outlet, the inlet water temperature of the inlet and the cumulative water flow in the circulating water path. In the case of non-first preheating in the continuous preheating mode, if it is monitored that the outlet water temperature of the water heater is less than or equal to a first preset temperature threshold within a continuous preset time, for example, the outlet water temperature is less than or equal to the first preset temperature threshold for 3 seconds (s), and the first preset temperature threshold is less than the set temperature, it indicates that the real-time temperature of the water in the hot water pipeline connected to the outlet of the gas water heater is lower than the set temperature, and the difference between the real-time temperature and the set temperature is greater than a certain range, and the next preheating program needs to be executed to adjust the temperature of the hot water section.

[0053] For example, if the set temperature is 40 degrees Celsius (°C), the first preset temperature threshold is 37 °C, and the controller monitors that the water outlet temperature is 30 °C within 3 seconds, which is obviously lower than the first preset temperature threshold 37 °C, at which time the temperature of the hot water section needs to be adjusted. In this embodiment, the actual value of the first preset temperature threshold can change according to the change of the set temperature, and the first preset temperature threshold is the starting temperature of the preheating program for heating the water body in the hot water section.

[0054] The controller controls the circulating water pump to start, so that the water body in the circulating water path starts to circulate until the hot water section water body is transferred to the water inlet of the gas water heater. It should be noted that in this embodiment, the controller will first control the water pump to start and keep the heating unit stopped, so as to ensure that when the heating unit operates and heats, it directly heats the hot water section water body, without heating the cold water section water body.

[0055] S202, if the water inlet temperature of the water heater is greater than or equal to the target temperature threshold within a continuous preset time, or the cumulative circulating water flow is greater than or equal to the first preset water flow threshold, the circulating water pump remains in the running state, and the heating unit is started to heat the water body until the single preheating end condition is met.

[0056] In this embodiment, the setting of the target temperature threshold can ensure that the gas water heater can stably identify the hot water section water body. In actual application, the target temperature threshold can be set as wherein, is the set temperature, is the initial temperature of the water inlet of the gas water heater, The average water inlet temperature of the gas water heater within 10 seconds after the circulating water pump is started for the first time after entering the continuous preheating mode can be used as the initial temperature. It should be noted that The water inlet temperature value at a suitable time can be selected as the initial temperature according to the needs of the actual application scene to ensure the accuracy of the target temperature threshold.

[0057] In this embodiment, the water inlet temperature of the water heater is greater than or equal to the target temperature threshold within a continuous preset time, at which time the water inlet temperature sensor at the water inlet of the gas water heater has detected that the water body in the pipeline at the water inlet has a significant temperature rise change, indicating that the water body in the hot water section of the gas water heater has been circulated to the water inlet of the gas water heater.

[0058] In the embodiment, the cumulative circulating water flow rate refers to the water flow rate of the water body in the circulating water path circulating in the pipeline. When the cumulative circulating water flow rate is greater than or equal to the first preset water flow threshold, it indicates that the water body in the circulating water path has moved a sufficient distance, so that the water body in the hot water section is circulated from between the water outlet of the gas water heater and the water taking point to between the water taking point and the water inlet of the gas water heater. In actual application, the lengths of the hot water pipeline and the cold water pipeline between the gas water heater and the water taking point, i.e., A1-A2 and B1-B3, are usually set to 1:1, and therefore, the first preset water flow threshold can be set to half of the total circulating water flow rate, i.e., 0.5 wherein, is the total circulating water flow rate, i.e., the water flow rate of the circulating water path circulating in all pipelines once. It should be noted that the first preset water flow threshold can also be adaptively adjusted according to the actual situation of the pipeline of the water path system in the actual application scenario.

[0059] In the embodiment, by judging the water inlet temperature or the cumulative circulating water flow rate, the actual position of the water body in the hot water section of the circulating water path of the gas water heater can be accurately identified, so that the heating unit is started when the hot water section moves to the water inlet of the gas water heater, and the water body in the hot water section is precisely heated. The temperature of the water body in the hot water section is greater than the temperature of the water body in the cold water section, so that the gas water heater can consume less gas to heat the water body to the set temperature, and ensure that the temperature of the water body in the hot water pipeline from the water outlet of the gas water heater to the water taking point is always within the set temperature range.

[0060] In summary, the embodiment provides a gas water heater preheating control method. In the continuous preheating mode, the cold water section is first excluded, and only the preheated hot water section is heated, without changing the hardware structure of the gas water heater. By setting the temperature threshold and the flow threshold, the position of the hot water section in the circulating water path can be effectively and accurately identified. The method is suitable for various zero-cold-water gas water heater models with a backwater pipe, effectively reduces gas consumption, and has a wide application prospect.

[0061] In one embodiment, the gas water heater preheating control method further comprises:

[0062] In the case of first preheating in the continuous preheating mode, if the outlet water temperature is less than or equal to the first preset temperature threshold within the continuous preset time, the heating unit is started to heat the water body, and the circulating water pump is started to circulate the water body in the circulating water path until the single preheating end condition is met.

[0063] In the first preheating of the continuous preheating mode, the controller starts the heating unit and the circulating water pump simultaneously or sequentially to start the water circulation and heat the water in the circulating water path when the water temperature in the hot water pipeline of the gas water heater is less than or equal to the first preset temperature threshold.

[0064] In one of the embodiments, the single preheating end condition is determined when any of the following conditions is met:

[0065] First, the outlet water temperature is greater than or equal to the second preset temperature threshold in the continuous preset time, and the return water temperature of the water heater is greater than the preset temperature threshold. The second preset temperature threshold is greater than the set temperature.

[0066] In this embodiment, the return water temperature of the water heater and the inlet water temperature of the water heater can be understood as the same temperature, that is, the temperature value detected by the inlet water temperature sensor of the gas water heater. The return water temperature of the gas water heater can also be detected by the return water temperature sensor additionally arranged on the return water pipeline. It should be noted that the return water temperature of the gas water heater refers to the temperature of the water flowing from the water taking point to the inlet of the gas water heater. The water received by the inlet of the gas water heater can be the mixed water of cold water and return water accessed through the cold water access port. It should be noted that the return water pipeline is not limited in this embodiment, and the collection method of the return water temperature can be determined according to the actual pipeline design of the water system in the actual application scene.

[0067] In this embodiment, the second preset temperature threshold is a temperature value set to be higher than the set temperature by a certain temperature. For example, the set temperature is 40℃, and the second preset temperature threshold can be 45℃ or 43℃. When the outlet water temperature is greater than or equal to the second preset temperature threshold in the continuous preset time, and the return water temperature of the water heater is greater than the preset temperature threshold (30℃), it indicates that the water temperature in the hot water pipeline has been preheated to the set temperature range, and the user can immediately take hot water at the water taking point. And because the water in the hot water pipeline mixes with the water in the cold water pipeline, the water temperature in the cold water pipeline is significantly higher than when the cold water pipeline is idle. The preset temperature threshold is greater than the initial temperature of the inlet. It should be noted that the preset time here can be the same as the preset time in the foregoing embodiments, for example, 3s, or can be greater than the preset time in the foregoing embodiments, for example, 5s. The setting of the preset time here is related to the setting position of the water taking point.

[0068] Second, the return water temperature of the water heater is greater than or equal to a target temperature threshold and a preheating heating time is greater than or equal to a preset time threshold within a continuous preset time; wherein the preheating heating time is a duration that the heating unit is in an operating state.

[0069] In the embodiment, the return water temperature of the water heater is greater than or equal to the target temperature threshold and the preheating heating time is greater than or equal to the preset time threshold within the continuous preset time, which indicates that the water in the cold water pipeline of the gas water heater has been mixed with the water in the hot water pipeline at this time, and the execution time of the preheating program has met the requirement that the water in the hot water pipeline is heated to the set temperature range.

[0070] Third, a cumulative preheating circulating water flow is greater than or equal to a second preset water flow threshold; wherein the second preset water flow threshold is greater than or equal to the first preset water flow threshold.

[0071] In the embodiment, the second preset water flow threshold can be set to 0.5 -0.8 . To ensure that the heating unit of the gas water heater at least completes the heating process of the water in the hot water section waterway, and realizes the temperature control adjustment of the hot water section waterway.

[0072] In the related art, different households have large differences in the installation length, position, and pipeline insulation measures of the circulating waterway, which can interfere with the accuracy of the preheating shutdown judgment, cause heating delay, and waste gas. Based on the above steps, the embodiment provides a gas water heater preheating control method. The judgment condition 1 (the first point condition described above) is suitable for the installation condition that the circulating waterway length is moderate and the insulation measures are good. During the heating process, the return water temperature continuously rises, and this stop heating condition is easily met. The judgment condition 2 (the second point condition described above) is suitable for the installation condition that the circulating waterway is long or has no insulation measures. During the heating process, the return water temperature first rises and then reaches thermal equilibrium and no longer rises. In this case, this stop heating condition is easily met. The judgment condition 3 (the third point condition described above) is suitable for the case of starting the energy-saving zero-cold-water mode. Through multiple judgment conditions, different waterway systems can be effectively adapted, the preheating shutdown judgment is accurate, and gas is effectively saved.

[0073] In one of the embodiments, as shown in Figure 3 the gas water heater preheating control method further comprises:

[0074] S301, in the case of first preheating in the continuous preheating mode or in the continuous preheating mode debugging event, acquiring a total water flow of the circulating waterway.

[0075] S302, determining a first preset water flow threshold and a second preset water flow threshold according to the total water flow.

[0076] In the embodiment, the continuous preheating mode debugging event refers to debugging the waterway flow, and is used to collect a control program of a threshold setting related parameter such as a total water flow of the circulating waterway. It should be noted that the first preheating of the continuous preheating mode can be simultaneously run with the debugging event, or separately run. Specifically, the first preheating of the continuous preheating mode can be configured according to the needs of the actual application scene.

[0077] In the embodiment, the first preset water flow threshold and the second preset water flow threshold are both set as a specific water flow value less than the total water flow, for example, 0.5 and 0.8 .

[0078] In one of the embodiments, the total water flow of the circulating waterway is obtained, including:

[0079] The cumulative instantaneous water flow from the first time to the second time is recorded to obtain the total water flow; wherein the first time is the starting time of the heating unit, and the second time is the time when the water inlet temperature is greater than or equal to the target temperature threshold within the continuous preset time is detected.

[0080] In the embodiment, in the standby state of the unit, the zero cold water function (continuous preheating mode) is turned on to enter the cruise heating, and the timing starts from the time when the unit ignition is successful to enter the water temperature control moment, which is recorded as the first time . The time when the system continuously detects for 2s is recorded as the second time . Then the total water flow is , wherein is the instantaneous water flow at time t, is the water inlet temperature after the waterway starts circulating, is the initial water inlet temperature, is the set temperature.

[0081] In one of the embodiments, the total water flow of the circulating waterway is obtained, further including:

[0082] If the water outlet temperature is less than the target temperature threshold at the water pump starting time, and the user does not perform the water taking action within the first time to the second time, the total water flow is obtained according to the cumulative instantaneous water flow recorded from the first time to the second time.

[0083] If the water outlet temperature is greater than or equal to the target temperature threshold at the water pump starting time, or the user performs the water taking action within the first time to the second time, the total water flow is obtained according to the cumulative instantaneous water flow recorded from the first time to the second time and the preset correction amount.

[0084] In the embodiment, the auxiliary judgment condition < , determine the initial state of the water body before sampling of each sensor of the gas water heater, ensure that the water temperature distribution of the circulating waterway before sampling is uniform, and there is no local higher water temperature that can cause interference with sampling later, further improving the sampling accuracy. For example, if there is high-temperature water in the circulating waterway, the sampling will end early due to the early satisfaction of the total water flow data obtained by sampling is inaccurate. Among them, that is, the outlet water temperature at the time of starting the water pump, which can also be called the initial outlet water temperature. Through the auxiliary judgment condition, the user's operation of interfering with sampling in the middle of the cruise preheating process is debugged. It can effectively exclude the problem that the sampling data is inaccurate due to the user's use of hot water in the middle. If the user uses hot water in the middle, it will cause the total water flow of the circulating pipeline to increase.

[0085] In this embodiment, if the outlet water temperature at the time of starting the water pump is greater than or equal to the target temperature threshold, or the auxiliary judgment condition that the user performs a water taking action within the first time to the second time occurs, the controller will increase a preset correction amount when obtaining the total water flow . For example, when the outlet water temperature at the time of starting the water pump is greater than or equal to the target temperature threshold, the cumulative instantaneous water flow recorded according to the first time to the second time is appropriately increased, and the total water flow is obtained. When the user performs a water taking action within the first time to the second time, the cumulative instantaneous water flow recorded according to the first time to the second time is appropriately reduced, and the total water flow is obtained.

[0086] In one of the embodiments, the gas water heater preheating control method further comprises:

[0087] According to the total water flow and the water taking point information of the last time the user performs a water taking action before the current time, a second preset water flow threshold is determined.

[0088] In this embodiment, as Figure 1 shown, if the water taking point of the last time the user performs a water taking action before the current time is water taking point 1, the second preset water flow threshold can be set to 0.7 . If the water taking point of the last time the user performs a water taking action before the current time is water taking point 2, the second preset water flow threshold can be set to 0.5 . Based on the above steps, the second preset water flow threshold is flexibly changed to realize flexible adjustment of water body heating in the hot water section waterway, ensure accurate heating of the hot water section, and further reduce gas consumption.

[0089] In summary, the embodiment provides a gas water heater preheating control method. In the first preheating, only the hot water section A1-A2 is heated. In the second preheating, the circulating pipeline water temperature state is identified first, and the water pump is started but not heated. Because the cold water section B1-B2-B3 is not heated, the identified water temperature is relatively low. When the water temperature is suddenly detected to be high (reaching the aforementioned identification threshold), it is considered that the first heated hot water section is identified, and all cold water sections are excluded. At this time, the gas water heater starts to ignite and heat. Obviously, the same preheating effect is achieved, and the overall energy saving is higher because the hot water section in the first heating is used as the reference water temperature during heating. The gas water heater preheating control method provided by the embodiment increases the screening conditions and improves the sampling accuracy for the method of obtaining the total water flow during preheating. For the complex preheating condition, multiple preheating termination conditions are designed to reduce the probability of heating delay shutdown. In the continuous preheating state, the current water temperature distribution of the circulating water pipeline is identified, and the cold water section is excluded. Through the above three points, the preheating accuracy can be greatly improved, the gas consumption can be saved, and the circulating preheating efficiency can be improved.

[0090] It should be understood that although each step in the flowchart involved in each of the above embodiments is displayed in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise stated herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in each of the above embodiments can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or steps or stages in other steps.

[0091] Based on the same inventive concept, the embodiment of the present application also provides a gas water heater preheating control device for implementing the above-mentioned gas water heater preheating control method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more gas water heater preheating control device embodiments provided below can refer to the limitations of the gas water heater preheating control method described above, and will not be repeated here.

[0092] In one embodiment, as shown in Figure 4 , a gas water heater preheating control device 400 is provided, comprising a cold water section identification module 410 and a heating control module 420, wherein:

[0093] ​The cold water section identification module 410 is configured to, in the case of non-first preheating in the continuous preheating mode, if the outlet water temperature of the water heater is less than or equal to a first preset temperature threshold for a continuous preset time, start the circulating water pump to circulate the water in the circulating water circuit, and the heating unit remains in a stopped state; the first preset temperature threshold is less than the set temperature.

[0094] The heating control module 420 is configured to, if the inlet water temperature of the water heater is greater than or equal to a target temperature threshold for a continuous preset time, or the cumulative circulating water flow is greater than or equal to a first preset water flow threshold, the circulating water pump remains in a running state, and the heating unit is started to heat the water until a single preheating end condition is met.

[0095] The above-mentioned various modules in the gas water heater preheating control device can be realized by software, hardware and combinations thereof, wholly or partially. The above-mentioned various modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so as to be called and executed by the processor to perform the operations corresponding to the above-mentioned various modules.

[0096] In an embodiment, a computer device can be provided, which can be a terminal, and an internal structure diagram thereof can be as shown in Figure 5 The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The input / output interface of the computer device is configured to exchange information between the processor and external devices. The communication interface of the computer device is configured to perform wired or wireless communication with external terminals, and the wireless communication can be achieved through WIFI, mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by the processor to implement a gas water heater preheating control method. The display unit of the computer device is configured to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer overlaid on the display screen, or can be a key, trackball or touchpad arranged on the shell of the computer device, or can be an external keyboard, touchpad or mouse, etc.

[0097] Those skilled in the art can understand that Figure 5The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0098] In one embodiment, a computer device is provided, comprising a memory and a processor, the memory storing a computer program, and the processor implementing the following steps when executing the computer program:

[0099] In the case of non-first preheating in the continuous preheating mode, if the outlet water temperature of the water heater is less than or equal to a first preset temperature threshold value within a continuous preset time, a circulating water pump is started to circulate the water body in the circulating water circuit, and the heating unit remains in a stopped state; the first preset temperature threshold value is less than the set temperature;

[0100] If the inlet water temperature of the water heater is greater than or equal to a target temperature threshold value, or the cumulative circulating water flow is greater than or equal to a first preset water flow threshold value, within a continuous preset time, the circulating water pump remains in a running state, the heating unit is started to heat the water body, until a single preheating end condition is met.

[0101] In one embodiment, a computer readable storage medium is provided, having a computer program stored thereon, and the computer program is executed by a processor to implement the following steps:

[0102] In the case of non-first preheating in the continuous preheating mode, if the outlet water temperature of the water heater is less than or equal to a first preset temperature threshold value within a continuous preset time, a circulating water pump is started to circulate the water body in the circulating water circuit, and the heating unit remains in a stopped state; the first preset temperature threshold value is less than the set temperature;

[0103] If the inlet water temperature of the water heater is greater than or equal to a target temperature threshold value, or the cumulative circulating water flow is greater than or equal to a first preset water flow threshold value, within a continuous preset time, the circulating water pump remains in a running state, the heating unit is started to heat the water body, until a single preheating end condition is met.

[0104] In one embodiment, a computer program product is provided, comprising a computer program, and the computer program is executed by a processor to implement the following steps:

[0105] In the case of non-first preheating in the continuous preheating mode, if the outlet water temperature of the water heater is less than or equal to a first preset temperature threshold value within a continuous preset time, a circulating water pump is started to circulate the water body in the circulating water circuit, and the heating unit remains in a stopped state; the first preset temperature threshold value is less than the set temperature;

[0106] If the water inlet temperature of the water heater is greater than or equal to the target temperature threshold or the cumulative circulating water flow is greater than or equal to the first preset water flow threshold within a continuous preset time, the circulating water pump remains in the running state, and the heating unit is started to heat the water body until the single preheating end condition is met.

[0107] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiments of the method. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0108] The technical features of the above embodiments can be combined in any way. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0109] The above-described embodiments are merely illustrative of several embodiments of the present application, and the description is relatively specific and detailed, but should not be understood as a limitation on the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A preheating control method for a gas water heater, characterized in that, include: In the case of non-initial preheating in continuous preheating mode, if the outlet water temperature of the water heater is less than or equal to the first preset temperature threshold within a continuous preset time, the circulating water pump is started to circulate the water in the circulating water circuit, and the heating unit remains in a stopped state; the first preset temperature threshold is less than the set temperature. If the cumulative circulating water flow rate is greater than or equal to the first preset water flow rate threshold, the circulating water pump remains in operation and the heating unit is started to heat the water until the single preheating end condition is met. The method further includes: In the case of the first preheating in continuous preheating mode, if the outlet water temperature is less than or equal to the first preset temperature threshold within a continuous preset time, the heating unit is started to heat the water, and the circulating water pump is started to circulate the water in the circulating water circuit until the single preheating end condition is met. The method further includes: The conditions for the termination of a single preheating cycle are determined to be met if the following conditions are met: The cumulative preheating circulating water flow rate is greater than or equal to the second preset water flow rate threshold; wherein, the second preset water flow rate threshold is greater than or equal to the first preset water flow rate threshold; The method further includes: In the case of the first preheating in continuous preheating mode or in the case of a continuous preheating mode debugging event, obtain the total water flow of the circulating water circuit; The first preset water flow threshold and the second preset water flow threshold are determined based on the total water flow. The process of obtaining the total water flow rate of the circulating water system includes: The cumulative instantaneous water flow rate from the first moment to the second moment is recorded to obtain the total water flow rate; wherein, the first moment is the start-up moment of the heating unit, and the second moment is the moment when the inlet water temperature is detected to be greater than or equal to the target temperature threshold within a continuous preset time.

2. The method according to claim 1, characterized in that, The method of obtaining the total water flow of the circulating water system also includes: If the outlet water temperature is less than the target temperature threshold at the time the water pump starts, and the user does not perform a water intake action between the first moment and the second moment, the total water flow rate is obtained based on the cumulative instantaneous water flow rate recorded between the first moment and the second moment. If the outlet water temperature is greater than or equal to the target temperature threshold at the time the water pump starts, or if the user performs a water intake action between the first and second moments, the total water flow rate is obtained based on the cumulative instantaneous water flow rate recorded between the first and second moments and the preset correction amount.

3. The method according to claim 1, characterized in that, The method further includes: The second preset water flow threshold is determined based on the total water flow and the water point information of the last water-taking action performed by the user before the current time.

4. A preheating control device for a gas water heater, characterized in that, include: The cold water segment identification module is used to start the circulating water pump to circulate the water in the circulating water circuit and keep the heating unit in a stopped state if the outlet water temperature of the water heater is less than or equal to a first preset temperature threshold within a continuous preset time in the case of non-initial preheating in continuous preheating mode; the first preset temperature threshold is less than the set temperature. The heating control module is used to keep the circulating water pump running and start the heating unit to heat the water if the cumulative circulating water flow is greater than or equal to the first preset water flow threshold, until the single preheating end condition is met. The heating control module is specifically used to start the heating unit to heat the water body and start the circulating water pump to circulate the water body in the case of the first preheating in the continuous preheating mode, if the outlet water temperature is less than or equal to the first preset temperature threshold within a continuous preset time, until the single preheating end condition is met. The heating control module is also used to determine that the single preheating end condition is met when the following condition is met: the cumulative preheating circulating water flow rate is greater than or equal to the second preset water flow rate threshold; wherein, the second preset water flow rate threshold is greater than or equal to the first preset water flow rate threshold. The cold water section identification module is also used to obtain the total water flow of the circulating water path in the case of the first preheating in the continuous preheating mode or in the case of a continuous preheating mode debugging event; and to determine the first preset water flow threshold and the second preset water flow threshold based on the total water flow. The process of obtaining the total water flow rate of the circulating water system includes: The cumulative instantaneous water flow rate from the first moment to the second moment is recorded to obtain the total water flow rate; wherein, the first moment is the start-up moment of the heating unit, and the second moment is the moment when the inlet water temperature is detected to be greater than or equal to the target temperature threshold within a continuous preset time.

5. A gas-fired water heater, characterized in that, It includes a circulating water pump, a circulating water circuit, a heating unit, an inlet water temperature sensor, an outlet water temperature sensor, a flow sensor, and a controller, wherein the controller is connected to the circulating water pump, the heating unit, the inlet water temperature sensor, the outlet water temperature sensor, and the flow sensor respectively; The controller is used to execute the gas water heater preheating control method according to any one of claims 1-3.

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