Antifreeze control method and antifreeze control device for gas water heater

Abstract

The present application relates to a freeze protection control method and device for a gas water heater, wherein the freeze protection control method includes: when detecting that the gas water heater meets preset freeze protection start conditions, obtaining the average water flow rate of a water pump at a first preset power and a first operating time; determining the number of water pump operations based on the pre-stored water storage volume of the gas water heater, the first operating time, and the average water flow rate; determining the operation interval duration of the water pump based on the first operating time, the average water flow rate, and a preset unit water flow rate; controlling an electric heating device to heat according to a preset heating power, and controlling the water pump to operate according to the first preset power, the operating interval duration, the first operating time, and the number of operations during the heating period of the electric heating device, so that the temperature of the stored water is increased by a preset temperature rise value when the water pump operation ends. The embodiments of the present application can prevent the stored water in the gas water heater from freezing in a low temperature environment.

Description

Technical Field

[0001] The present application relates to the technical field of antifreeze control for gas water heaters, and in particular to an antifreeze control method and an antifreeze control device for gas water heaters. Background Art

[0002] A gas water heater, also known as a gas water heater, uses gas as fuel, heating it through combustion and transferring heat to cold water flowing through a heat exchanger to produce hot water. When the ambient temperature drops below freezing, the water in the gas water heater begins to freeze. This freezing expands the water's volume, making it prone to rupturing pipes. Summary of the Invention

[0003] In view of the shortcomings of the existing methods, the present application provides an antifreeze control method and an antifreeze control device for a gas water heater, so as to solve the technical problem in the prior art that the pipes of the gas water heater are easily burst after the stored water begins to freeze.

[0004] In a first aspect, an embodiment of the present application provides an antifreeze control method for a gas water heater, the gas water heater comprising a water pump and an electric heating device arranged on a water flow pipe, the control method comprising: when it is detected that the gas water heater meets a preset antifreeze start-up condition, obtaining the average water flow rate of the water pump at a first preset power and a first operating time; determining the number of operations of the water pump based on the pre-stored water storage volume of the gas water heater, the first operating time and the average water flow rate; determining the operating interval duration of the water pump based on the first operating time, the average water flow rate and a preset unit water flow rate; the unit flow rate is the water flow rate corresponding to the water pump when the electric heating device raises the stored water to a preset temperature rise value at a preset heating power; controlling the electric heating device to heat according to the preset heating power, and controlling the water pump to operate according to the first preset power, the operating interval duration, the first operating time and the number of operations during the heating period of the electric heating device, so that when the water pump ends its operation, the water temperature of the stored water is raised by the preset temperature rise value.

[0005] As an optional embodiment, the gas water heater also includes a gas heating device arranged on the water flow pipe, and the control method also includes: when the water storage volume of the gas water heater is not obtained, controlling the water flow of the water pump at a second preset power to reach a preset heating water flow, and then starting the gas heating device for heating; during the heating period of the gas heating device, when the current outlet water temperature is greater than or equal to the preset starting temperature, collecting the water inlet flow sequence and the water inlet temperature sequence; if the water inlet temperature sequence meets the preset heating rule, determining the heated water volume according to the water inlet flow sequence, and using the heated water volume as the water storage volume of the gas water heater; the heated water volume is the water volume corresponding to the water inlet end flowing through the water flow pipe when the water inlet temperature sequence meets the preset heating rule; executing the step of obtaining the average water flow of the water pump at the first preset power and the first operating time when it is detected that the gas water heater meets the preset anti-freeze start condition.

[0006] As an optional implementation manner, the inlet water temperature sequence satisfies the preset heating rule, including: if a preset number of target inlet water temperature values ​​in the inlet water temperature sequence increase in temperature, and the difference between the last target inlet water temperature value and the first target inlet water temperature value among the preset number of target inlet water temperature values ​​is greater than the preset temperature difference, then it is determined that the inlet water temperature sequence satisfies the preset heating rule; the target inlet water temperature value is the inlet water temperature value closest to the collection time and the current time, the last target inlet water temperature value is the inlet water temperature value closest to the current time among the target inlet water temperature values, and the first target inlet water temperature value is the inlet water temperature value farthest from the current time among the target inlet water temperature values.

[0007] As an optional implementation method, the control method also includes: collecting the current water outlet temperature at the end of the operation of the water pump; if the current water outlet temperature is greater than or equal to the preset verification temperature, repeating the step of obtaining the average water flow of the water pump at the first preset power and the first operating time when it is detected that the gas water heater meets the preset anti-freeze start-up conditions; if the current water outlet temperature is lower than the preset verification temperature, repeating the step of controlling the water flow of the water pump at the second preset power to reach the preset heating water flow when the water storage volume of the gas water heater is not detected.

[0008] As an optional implementation, obtaining the average water flow of the water pump under a first preset power and a first operating time includes: using the first operating time as a first collection time to collect an operating water flow sequence; and determining the average water flow based on the operating water flow sequence.

[0009] As an optional implementation manner, the number of times the water pump operates is determined based on the pre-stored water storage volume of the gas water heater, the first operating time and the average water flow rate, including: the ratio of the product of the water storage volume of the gas water heater and the first operating time to the average water flow rate is used as the number of times the water pump operates.

[0010] As an optional implementation manner, according to the first operation time, the average water flow rate and the preset unit water flow rate, the formula for determining the operation interval time of the water pump is: T 运转 =(T1×L1 / L0)-T1; where T 运转 is the operation interval of the water pump, L1 is the average water flow rate, T1 is the first operation time, and L0 is the unit water flow rate.

[0011] As an optional implementation manner, the control method further includes: if the average water flow rate is less than a preset blockage alarm reminder flow rate, outputting a blockage alarm reminder signal.

[0012] As an optional implementation method, the gas heating device is started for heating after the water flow of the water pump at the second preset power reaches a preset heating water flow, including: collecting the current water flow of the water pump at the second preset power; within the preset second collection time period, when the current water flow is greater than or equal to the heating start water flow, the gas heating device is started for heating.

[0013] In a second aspect, an embodiment of the present application provides an antifreeze control device for a gas water heater, wherein the gas water heater comprises a water pump and an electric heating device arranged on a water flow pipe, and the control device comprises: an average water flow acquisition module for acquiring the average water flow of the water pump under a first preset power and a first operating time when it is detected that the gas water heater meets a preset antifreeze start-up condition; an operation number determination module for determining the operation number of the water pump according to the pre-stored water storage volume of the gas water heater, the first operating time and the average water flow; an operation interval duration determination module for determining the operation number of the water pump according to the pre-stored water storage volume of the gas water heater, the first operating time and the average water flow; and an operation interval duration determination module for determining the operation number of the water pump according to the pre-stored water storage volume of the gas water heater, the first operating time and the average water flow. The operation interval duration of the water pump is determined according to the first operation duration, the average water flow rate and the preset unit water flow rate; the unit flow rate is the water flow rate corresponding to the water pump when the electric heating device raises the stored water to a preset temperature rise value with a preset heating power; the water pump operation control module is used to control the electric heating device to heat according to the preset heating power, and control the water pump to operate according to the first preset power, the operation interval duration, the first operation duration and the number of operations during the heating period of the electric heating device, so that when the water pump ends its operation, the water temperature of the stored water is raised to the preset temperature rise value.

[0014] The present application provides an antifreeze control method and an antifreeze control device for a gas water heater. The technical solutions provided by the embodiments of the present application bring at least the following beneficial effects:

[0015] By controlling the electric heating device and the water pump, the stored water in the gas water heater is heated multiple times in a circulating manner to increase the stored water temperature of the gas water heater by increasing the preset temperature rise value, so that the stored water temperature of the gas water heater is higher than the freezing temperature to avoid the stored water in the gas water heater from freezing.

[0016] The water pump operates at a first preset power to control the noise below a preset noise value to avoid disturbing the user.

[0017] Under extreme ambient temperatures (e.g., minus 20 degrees Celsius), the heating capacity of the electric heating device may be insufficient, and circulating antifreeze is used for supplementary heating to ensure heating efficiency and antifreeze effect.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure of a gas water heater provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a structure in which a water flow pipe in a gas water heater provided in an embodiment of the present application is connected to a peripheral pipe outside the gas water heater;

[0022] Figure 3 A flow chart of an antifreeze control method for a gas water heater provided in an embodiment of the present application;

[0023] Figure 4 A flow chart of another antifreeze control method for a gas water heater provided in an embodiment of the present application;

[0024] Figure 5 A flow chart of another antifreeze control method for a gas water heater provided in an embodiment of the present application;

[0025] Figure 6A schematic diagram of the relationship between the heating time of an electric heating device and the operating interval of a water pump in a method for controlling the freezing of a gas water heater provided in an embodiment of the present application;

[0026] Figure 7 A schematic diagram of the framework of an antifreeze control device for a gas water heater provided in an embodiment of the present application.

[0027] Reference numerals and corresponding descriptions:

[0028] 100: shell;

[0029] 110: water pipe;

[0030] 120: peripheral pipeline;

[0031] 130: water inlet temperature sensor;

[0032] 140: water outlet temperature sensor;

[0033] 150: water flow sensor;

[0034] 160: Electric heating device;

[0035] 200: average water flow acquisition module;

[0036] 210: Operation times determination module;

[0037] 220: Operation interval duration determination module;

[0038] 230: Water pump operation control module. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0040] The structure of the gas water heater in the embodiment of the present application is as follows Figure 1-2 As shown, it mainly includes a shell 100, a water flow pipe 110 is arranged inside the shell 100, and a peripheral pipe 120 connected to the water flow pipe 110 is arranged outside the shell 100; wherein, the water inlet end of the water flow pipe 110 is connected to the water outlet end of the peripheral pipe 120, and the water outlet end of the water flow pipe 110 is connected to the water outlet end of the peripheral pipe 120, and the water flowing out of the water flow pipe 110 flows back to the water flow pipe 110 through the peripheral pipe 120 to form a circulation pipe.

[0041] A water inlet temperature sensor 130 for collecting the water inlet temperature is provided at the water inlet end of the water flow pipe 110, and a water outlet temperature sensor 140 for collecting the water outlet temperature is provided at the water outlet end of the water flow pipe 110; a water flow sensor 150, a water pump, a gas heating device and an electric heating device 160 are also provided on the water flow pipe 110, and the electric heating device 160 is at least used to heat the water so that the water temperature is much greater than the freezing temperature; a smoke exhaust port is also provided on the shell 100, and cold air can enter from the smoke exhaust port and reduce the water temperature of the water in the water flow pipe 110. An ambient temperature sensor is provided at the smoke exhaust port, and the ambient temperature sensor detects the air temperature.

[0042] like Figure 3 As shown, the embodiment of the present application provides an antifreeze control method for a gas water heater, which mainly includes steps S1-S4:

[0043] Step S1: When it is detected that the gas water heater meets the preset antifreeze start condition, the average water flow rate of the water pump under the first preset power and first operation time is obtained.

[0044] In some possible embodiments, when the current temperature detected by any of the gas water heater's water inlet temperature sensor 130, water outlet temperature sensor 140, and ambient temperature sensor is less than a preset freezing temperature, the water pump may be controlled to operate at a first preset power for a preset first operating time to determine the average water flow rate. The first preset power is a power at which the noise generated by the water pump during operation is less than a preset noise level, thereby preventing the noise generated by the water pump from disturbing the user. Alternatively, the first preset power is the minimum power of the water pump. Alternatively, the first preset power is 30% of the rated power of the water pump. Alternatively, the preset noise level is 30 decibels.

[0045] When the water temperature is lower than 0 degrees Celsius, the water begins to freeze. Since there is an error in the data collected by the temperature sensor (for example, 1 degree Celsius), the freezing temperature can be set to 5 degrees Celsius.

[0046] Step S2: determining the number of times the water pump operates according to the pre-stored water storage volume, the first operating time and the average water flow of the gas water heater.

[0047] After the gas water heater stops working, water remains in the circulation pipe. The water stored in the gas water heater is the water in the circulation pipe. The water storage volume data of the gas water heater can be pre-stored in the database, or it can be determined by setting when the gas water heater is in working state and then stored in the database.

[0048] The gas water heater in the embodiment of the present application heats the stored water in the gas water heater via the electric heating device 160 to avoid disturbing the user with noise generated by the heating process. The gas water heater may be installed in certain environments (e.g., an environment of -20 degrees Celsius). In such environments, the water temperature dissipates heat quickly, and the electric heating device 160 may be prone to insufficient heating capacity. Therefore, the electric heating device 160 can be heated multiple times in a circulating flow manner to improve heating efficiency and ensure antifreeze effect.

[0049] Step S3: determining the operation interval duration of the water pump according to the first operation duration, the average water flow rate and the preset unit water flow rate.

[0050] The unit water flow rate is the water flow rate of the water pump when the electric heating device 160 raises the water temperature of the gas water heater to the preset temperature value at the preset heating power. Assuming that the maximum heating power of the gas heating device in the embodiment of the application is 23 kilowatts, 23 kilowatts is equivalent to a water flow rate of 13 liters per minute, and the maximum heating temperature is 25 degrees Celsius; when the power is 1 kilowatt and the water flow rate is 1 liter per minute, the maximum heating temperature is 14 degrees (i.e., the heating coefficient is 14), that is, P = L × (T 设置 -T 进水 ) / 14), where P is the heating power, L is the water flow of the gas water heater, and T 设置 is the set temperature of the gas water heater, T 进水 The water inlet temperature of the gas water heater. When the air pressure is normal, the heating coefficient is 14. When the air pressure is high, the heating coefficient is greater than 14; otherwise, the heating coefficient is less than 14.

[0051] When the heating power of electric heater 160 is 100 watts, the water flow rate is equivalent to 1 liter per minute, and the maximum heating temperature is 1.4 degrees Celsius. If the water temperature of the gas water heater is raised by 10 degrees Celsius using electric heater 160 with a heating power of 100 watts, the water flow rate is 0.14 liters per minute, and this 0.14 liters per minute water flow rate is the unit water flow rate.

[0052] The operation interval of the water pump is the interval between the last time the water pump finished operating for a preset operation duration (for example, the first operation duration) and the next time the water pump starts operating for the preset operation duration.

[0053] Due to heat loss, the heating efficiency of the electric heating device 160 is less than 100%. The numerical values ​​listed above for the corresponding relationship between heating power, heating temperature, and water flow rate do not take into account factors such as heat loss and air pressure. If the heating efficiency is 0.9 and the air pressure is normal, 100 watts of power is equivalent to a water flow rate of 1 liter per minute, which can heat the water by 1.26 (1.4 x 0.9) degrees Celsius. For ease of explanation, all numerical values ​​in this embodiment take into account the influence of heating efficiency and air pressure.

[0054] Step S4: Control the electric heating device 160 to heat according to the preset heating power, and control the water pump to operate according to the first preset power, operation interval duration, first operation duration and number of operations during the heating period of the electric heating device 160, so that when the water pump ends, the water temperature of the stored water rises by the preset temperature rise value.

[0055] Optionally, the preset heating power of the electric heating device 160 is 100 watts.

[0056] Optionally, the preset temperature rise value is 10 degrees Celsius.

[0057] An embodiment of the present application provides an antifreeze control method for a gas water heater, which controls the electric heating device 160 and the water pump to heat the stored water in the gas water heater multiple times in a circulating manner, so as to increase the stored water temperature of the gas water heater by a preset temperature rise value, so that the stored water temperature of the gas water heater is greater than the freezing temperature, so as to avoid the stored water in the gas water heater from freezing.

[0058] like Figure 4 As shown, as an optional embodiment, the antifreeze control method for a gas water heater further includes steps S5-S8:

[0059] Step S5: When the water storage volume of the gas water heater is not obtained, the gas heating device is started for heating after the water flow of the water pump at the second preset power reaches the preset heating water flow.

[0060] Based on the foregoing embodiments, some possible embodiments are provided. After the current temperature collected by any of the water inlet temperature sensor 130, the water outlet temperature sensor 140 and the ambient temperature sensor of the gas water heater is lower than the preset freezing temperature, it can be confirmed whether the water storage volume data of the gas water heater is stored in the database. If it is determined that the water storage volume data of the gas water heater is stored, the step of obtaining the average water flow rate of the water pump at the first preset power and the first operating time is executed.

[0061] In another possible embodiment, this embodiment differs from the previous embodiment in that the timing for confirming whether the water storage volume data of the gas water heater is stored in the database is different. After the current temperature collected by any of the gas water heater's water inlet temperature sensor 130, the water outlet temperature sensor 140, and the ambient temperature sensor is less than a preset freezing temperature, the step of obtaining the average water flow rate of the water pump at a first preset power and a first operating duration is executed. During or at the end of obtaining the average water flow rate of the water pump at the first preset power and the first operating duration, it is confirmed whether the water storage volume data of the gas water heater is stored in the database. If it is determined that the water storage volume data of the gas water heater is stored, the step of determining the number of water pump operations based on the pre-stored water storage volume of the gas water heater, the first operating duration, and the average water flow rate is executed.

[0062] In the two most recent embodiments mentioned above, if the water storage volume data of the gas water heater is not stored, the step of controlling the water flow of the water pump at the second preset power to reach the preset heating water flow and then starting the gas heating device for heating is executed.

[0063] Step S6: During the heating period of the gas heating device, when the current outlet water temperature is greater than or equal to the preset starting temperature, the inlet water flow sequence and the inlet water temperature sequence are collected.

[0064] The startup temperature is greater than the antifreeze temperature, and the difference between the startup temperature and the antifreeze temperature is greater than the preset misjudgment temperature difference. Optionally, the startup temperature is the sum of the user-set outlet water temperature and the compensation temperature. Optionally, the compensation temperature is 4 degrees Celsius. Since the stored water experiences a significant temperature drop as it flows through the circulation pipeline, an additional 4 degrees Celsius can be used to compensate. If the inlet water temperature is lower, or if the preset startup temperature is higher, the compensation temperature can be increased accordingly.

[0065] Optionally, the starting temperature is the sum of the factory preset temperature and the compensation temperature. In the case where the user does not set the water outlet temperature, the manufacturer can pre-set the temperature.

[0066] Optionally, the manufacturer's preset temperature may be greater than or equal to 40 degrees Celsius and less than or equal to 60 degrees Celsius.

[0067] Optionally, the preset misjudgment temperature difference may be equal to 35 degrees Celsius and less than or equal to 55 degrees Celsius.

[0068] Step S7: If the inlet water temperature sequence meets the preset heating rule, the heating water volume is determined according to the inlet water flow sequence, and the heating water volume is used as the water storage volume of the gas water heater.

[0069] The heated water volume is the corresponding water volume flowing through the water inlet end of the water pipe 110 when the water inlet temperature sequence meets the preset heating rule.

[0070] If the inlet water temperature sequence satisfies a preset temperature increase rule, and the water volume for temperature increase determined according to the inlet water flow sequence, it can be determined that the stored water in the circulation pipeline circulates one circle. The water volume for one circle of the stored water in the circulation pipeline can be determined by the corresponding flow values and time values in the collected inlet water flow sequence, and this water volume is the stored water volume of the gas water heater.

[0071] Step S8: Execute the step of obtaining the average water flow rate of the water pump at the first preset power and the first operation duration when it is detected that the gas water heater meets the preset anti-freezing start condition.

[0072] After determining the stored water volume of the gas water heater, the steps of S1 above can be executed to perform anti-freezing control.

[0073] As an optional implementation manner, the inlet water temperature sequence in the foregoing step S7 satisfying the preset temperature increase rule includes the steps of:

[0074] If a preset number of target inlet water temperature values in the inlet water temperature sequence increase in temperature, and the difference between the last target inlet water temperature value and the first target inlet water temperature value among the preset number of target inlet water temperature values is greater than the preset temperature difference, it is determined that the inlet water temperature sequence satisfies the preset temperature increase rule.

[0075] Among them, the target inlet water temperature value is the inlet water temperature value with the closest collection time to the current time, the last target inlet water temperature value is the inlet water temperature value with the closest time to the current time among the target inlet water temperature values, and the first target inlet water temperature value is the inlet water temperature value with the farthest time from the current time among the target inlet water temperature values.

[0076] Optionally, the temperature difference is 5 degrees Celsius.

[0077] In a possible embodiment, the preset number of target inlet water temperature values is 10. When the inlet water temperature sequence satisfies the preset temperature increase rule, the 10 target inlet water temperature values are A1, A2, A3, A4, A5, A6, A7, A8, A9, and A10 in sequence according to the collection order.

[0078] Among them, A10 is the last target inlet water temperature value, A1 is the first target inlet water temperature value. If A1 < A2 < A3 < A4 < A5 < A6 < A7 < A8 < A9 < A10, and the difference between A10 and A1 is greater than or equal to 5 (the foregoing temperature difference), it is determined that the inlet water temperature sequence satisfies the preset temperature increase rule.

[0079] As Figure 5 shown, as an optional implementation manner, the anti-freezing control method of the gas water heater further includes steps S10 - S30:

[0080] Step S10: Collect the current outlet water temperature when the water pump stops running.

[0081] When it is detected that the water pump has finished running, the outlet water temperature sensor 140 is controlled to collect the current outlet water temperature.

[0082] Step S20: If the current outlet water temperature is greater than or equal to the preset verification temperature, repeat the step of obtaining the average water flow of the water pump at the first preset power and first operating time when it is detected that the gas water heater meets the preset antifreeze start condition.

[0083] If the current outlet water temperature is greater than or equal to the preset verification temperature, it means that the water temperature of the gas water heater has increased by the preset temperature rise value and the antifreeze effect has been achieved, then the process returns to the aforementioned step S1 to determine the antifreeze start-up conditions.

[0084] Optionally, the verification temperature is 6 degrees Celsius.

[0085] Step S30: If the current outlet water temperature is lower than the preset verification temperature, repeat the step of starting the gas heating device for heating after controlling the water flow of the water pump at the second preset power reaches the preset heating water flow when the water storage volume of the gas water heater is not detected.

[0086] If the current outlet water temperature is lower than the preset verification temperature, it indicates that the heat of the stored water in the gas water heater is lost too quickly, and the aforementioned step S5 is executed to reconfirm the water storage capacity of the gas water heater.

[0087] As an optional implementation manner, the step S1 of obtaining the average water flow rate of the water pump at the first preset power and the first operating time includes:

[0088] The first operation duration is used as the first collection duration to collect the operation water flow sequence; and the average water flow is determined according to the operation water flow sequence.

[0089] The operating water flow sequence is collected at a preset first collection frequency, wherein the first collection frequency is once per second. Optionally, the first operating time is 10 seconds.

[0090] In one possible embodiment, the water pump is operated at 30% of the rated power for 10 seconds, and 10 water flow values ​​are collected once per second during the 10-second period. The average water flow rate during the 10-second period is determined using the 10 water flow values.

[0091] As an optional implementation manner, the above-mentioned step S2 of determining the number of operations of the water pump according to the pre-stored water storage volume, the first operation time and the average water flow of the gas water heater includes:

[0092] The ratio of the product of the water storage volume of the gas water heater and the first operation time to the average water flow rate is used as the number of operations of the water pump.

[0093] The formula for determining the number of water pump operations based on the pre-stored water storage volume of the gas water heater, the first operation time, and the average water flow rate is:

[0094] N = L2 × T1 / L1;

[0095] Among them, N is the number of times the water pump operates, L2 is the water storage capacity of the gas water heater, L1 is the average water flow rate, and T1 is the first operating time.

[0096] In one possible embodiment, since the water flow rate when the water pump is running will be significantly greater than the aforementioned unit water flow rate of 0.14L per minute, the water pump can only operate intermittently. If the first operating time is 10 seconds, the amount of water delivered by the water pump each time it runs for the first operating time is 10×L1 (in liters per minute) = L1 / 6, then the number of times the water pump runs is N = L2 / (L1 / 6) = 6×L2 / L1; where L1 is the average water flow rate, L2 is the water storage capacity of the gas water heater, and N is the number of times the water pump runs. Due to heat dissipation, the adjustment coefficient can be increased to adapt. If the adjustment coefficient is 1.2, the number of times the water pump runs is (6×1.2×L2) / L1.

[0097] As an optional implementation manner, the formula for determining the operation interval duration of the water pump in the aforementioned step S3 according to the first operation duration, the average water flow rate and the preset unit water flow rate is:

[0098] T 运转 =(T1×L1 / L0)-T1;

[0099] Among them, T 运转 is the operation interval of the water pump, L1 is the average water flow rate, T1 is the first operation time, and L0 is the unit water flow rate.

[0100] In some possible embodiments, the heating time of the electric heating device 160 is determined by the following formula:

[0101] T 加热 =T1×L1 / L0;

[0102] Among them, T 加热 is the heating time of the electric heating device 160 before each operation of the water pump, T1 is the first operation time, and L0 is the unit water flow rate.

[0103] like Figure 6As shown, before the water pump operates for the first time, the heating time of the electric heating device 160 is T1×L1 / L0 to ensure that the water temperature rises by 10 degrees Celsius. When the heating time of the electric heating device 160 ends, the water pump operates for the first operating time. During the operation of the water pump, the electric heating device 160 continues to heat. When the first operating time of the water pump ends, after a time of (T1×L1 / L0)-T1, the water pump operates again, and then the water pump stops operating, and this cycle repeats until the number of operations of the water pump is reached.

[0104] As an optional implementation manner, the control method further includes:

[0105] If the average water flow rate is less than the preset clogging alarm flow rate, a clogging alarm signal is output.

[0106] As an optional implementation manner, the control method further includes:

[0107] If the average water flow rate is greater than or equal to the preset blockage alarm reminder flow rate, the above-mentioned step S2 is executed, that is, the number of water pump operations is determined based on the pre-stored water storage volume of the gas water heater, the first operation time and the average water flow rate.

[0108] As an optional implementation manner, after the water flow rate of the water pump at the second preset power reaches the preset heating water flow rate in the aforementioned step S5, the gas heating device is started for heating, including:

[0109] The current water flow of the water pump at the second preset power is collected; within the preset second collection time, when the current water flow is greater than or equal to the heating start water flow, the gas heating device is started for heating.

[0110] Optionally, the second preset power is the maximum power of the water pump. When the water pump operates at the maximum power and the current water flow reaches the starting water flow within the preset second collection time, and the current water flow is greater than the equal starting water flow, it is considered that the gas water heater has detected a water flow signal, and the gas heating device can be started for heating.

[0111] Optionally, the second acquisition duration is 8 seconds.

[0112] Optionally, the starting water flow rate is 2.5 liters per minute.

[0113] As an optional implementation, at the end of the preset second collection time, if all the collected current water flow rates are less than the heating start water flow rate, a blockage alarm reminder signal is output.

[0114] At the end of the preset second collection time, if all the current water flow rates collected are less than the heating start water flow rate, it means that the circulation pipeline is blocked and the gas heating device cannot be started for heating. In addition, since the heating power of the gas water heater is large, if the current water flow rate is less than the heating start water flow rate and the gas heating device is started for heating, it is easy to cause the gas water heater to dry burn.

[0115] It should be understood that although Figures 3 to 5 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figures 3 to 5 At least part of the steps may include multiple steps or multiple stages. These steps or stages are not necessarily performed at the same time, but can be performed at different times. The order of execution of these steps or stages is not necessarily one by one, but can be performed in turn or alternately with other steps or at least part of the steps or stages in other steps.

[0116] It can be understood that the same / similar parts between the various embodiments of the above method in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments. For related parts, please refer to the description of other method embodiments.

[0117] like Figure 7 As shown, based on the same inventive concept, an embodiment of the present application provides an antifreeze control device for a gas water heater, the gas water heater includes a water pump and an electric heating device 160 arranged on a water flow pipe 110, and the control device includes an average water flow acquisition module 200, an operation number determination module 210, an operation interval duration determination module 220 and a water pump operation control module 230. The average water flow acquisition module 200 is used to obtain the average water flow of the water pump under the first preset power and the first operating time when it is detected that the gas water heater meets the preset anti-freeze start-up conditions; the operation number determination module 210 is used to determine the number of operations of the water pump based on the pre-stored water storage volume of the gas water heater, the first operating time and the average water flow; the operation interval duration determination module 220 is used to determine the operation interval duration of the water pump based on the first operating time, the average water flow and the preset unit water flow; the unit flow is the water flow corresponding to the water pump when the electric heating device 160 raises the stored water to the preset temperature rise value at the preset heating power; the water pump operation control module 230 is used to control the electric heating device 160 to heat according to the preset heating power, and control the water pump to operate according to the first preset power, operation interval duration, the first operating time and the number of operations during the heating period of the electric heating device 160, so that when the water pump operation ends, the water temperature of the stored water rises to the preset temperature rise value.

[0118] An embodiment of the present application provides an antifreeze control device for a gas water heater, which controls the electric heating device 160 and the water pump to heat the stored water in the gas water heater multiple times in a circulating manner, so as to increase the stored water temperature of the gas water heater by a preset temperature rise value, so that the stored water temperature of the gas water heater is greater than the freezing temperature, so as to avoid the stored water in the gas water heater from freezing.

[0119] As an optional embodiment, the gas water heater further includes a gas heating device provided on the water flow pipe 110, and the control device further includes a gas heating device starting module, a collection module, a judgment module, and an execution module. The gas heating device starting module is used to control the water flow of the water pump at the second power to reach a preset heating water flow when the water storage volume of the water flow pipe 110 is not obtained, and then start the gas heating device for heating; the collection module is used to collect the water inlet flow sequence and the water inlet temperature sequence when the current water outlet temperature is greater than or equal to the preset starting temperature during the heating period of the gas heating device; the judgment module is used to determine the amount of heated water according to the water inlet flow sequence if the water inlet temperature sequence meets the preset heating rule, and use the heated water amount as the water storage volume of the gas water heater; the heated water amount is the amount of water corresponding to the water inlet of the water flow pipe 110 when the water inlet temperature sequence meets the preset heating rule; the execution module is used to execute the step of obtaining the average water flow of the water pump at the first preset power and the first operating time when it is detected that the gas water heater meets the preset anti-freeze starting condition.

[0120] As an optional implementation manner, the judgment module is specifically configured to:

[0121] If the temperatures of a preset number of target inlet water temperature values ​​in the inlet water temperature sequence increase, and the difference between the last target inlet water temperature value and the first target inlet water temperature value among the preset number of target inlet water temperature values ​​is greater than the preset temperature difference, it is determined that the inlet water temperature sequence meets the preset heating rule; the target inlet water temperature value is the inlet water temperature value closest to the collection time and the current time, the last target inlet water temperature value is the inlet water temperature value closest to the current time among the target inlet water temperature values, and the first target inlet water temperature value is the inlet water temperature value farthest from the current time among the target inlet water temperature values.

[0122] As an optional embodiment, the antifreeze control device for the gas water heater further includes a current outlet water temperature acquisition module, a first repetitive execution module, and a second repetitive execution module. The current outlet water temperature acquisition module is used to acquire the current outlet water temperature when the water pump ends its operation; the first repetitive execution module is used to repeatedly execute the step of obtaining the average water flow rate of the water pump at a first preset power and a first operating time when it is detected that the gas water heater meets the preset antifreeze start-up conditions if the current outlet water temperature is greater than or equal to a preset verification temperature; the second repetitive execution module is used to repeatedly execute the step of controlling the water flow rate of the water pump at a second power to reach a preset heating water flow rate and then starting the gas heating device for heating when the water storage volume of the water flow pipe 110 is not detected if the current outlet water temperature is less than the preset verification temperature.

[0123] As an optional implementation manner, the operation number determination module 210 is specifically configured to:

[0124] The ratio of the product of the water storage volume of the gas water heater and the first operation time to the average water flow rate is used as the number of operations of the water pump.

[0125] As an optional implementation manner, the operation interval duration determination module 220 is specifically configured to:

[0126] The operation interval of the water pump is determined according to the first operation time, the average water flow and the preset unit water flow, including: the ratio of the product of the first operation time and the average water flow to the unit water flow is used as the operation interval.

[0127] As an optional implementation manner, the average water flow acquisition module is specifically used to:

[0128] The first operation duration is used as the first collection duration to collect the operation water flow sequence; and the average water flow is determined according to the operation water flow sequence.

[0129] As an optional implementation, the antifreeze control device of the gas water heater further includes a blockage alarm reminder module, which is used to output a blockage alarm reminder signal if the average water flow rate is less than a preset blockage alarm reminder flow rate.

[0130] As an optional implementation manner, the gas heating device starting module is specifically used to:

[0131] The current water flow of the water pump at the second power is collected; within the preset second collection time, when the current water flow is greater than or equal to the heating start water flow, the gas heating device is started for heating.

[0132] The present application provides an antifreeze control method and an antifreeze control device for a gas water heater. The technical solutions provided by the embodiments of the present application bring at least the following beneficial effects:

[0133] By controlling the electric heating device 160 and the water pump, the stored water in the gas water heater is heated multiple times in a circulating manner to increase the stored water temperature of the gas water heater by a preset temperature rise value, so that the stored water temperature of the gas water heater is greater than the freezing temperature to avoid the stored water in the gas water heater from freezing.

[0134] The water pump operates at a first preset power to control the noise below a preset noise value to avoid disturbing the user.

[0135] Under extreme ambient temperatures (eg, minus 20 degrees Celsius), the heating capacity of the electric heating device 160 may be insufficient, and circulating antifreeze is used for supplementary heating to ensure heating efficiency and antifreeze effect.

[0136] The specific definitions of the antifreeze control device for a gas water heater can be found in the definitions of the antifreeze control method for a gas water heater described above and will not be further elaborated here. Each module in the antifreeze control device for a gas water heater can be implemented in whole or in part through software, hardware, or a combination thereof. Each of these modules can be embedded in or independent of a processor in a computer device in hardware form, or stored in a computer device memory in software form, allowing the processor to call and execute the corresponding operations of each module.

[0137] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0138] Each embodiment in this specification is described in a related manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiment is generally similar to the method embodiment, so the description is relatively simple. For related parts, refer to the description of the method embodiment.

[0139] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0140] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for controlling the antifreeze of a gas water heater, characterized in that: The gas water heater comprises a water pump and an electric heating device (160) arranged on a water flow pipe (100), and the control method comprises: When it is detected that the gas water heater meets the preset antifreeze start condition, obtaining the average water flow of the water pump under the first preset power and first operation time; determining the number of operations of the water pump according to the pre-stored water storage volume of the gas water heater, the first operation time, and the average water flow rate; Determining the operation interval of the water pump according to the first operation duration, the average water flow rate, and a preset unit water flow rate; the unit water flow rate is the water flow rate corresponding to the water pump when the electric heating device (160) raises the stored water temperature to a preset temperature rise value at a preset heating power; Controlling the electric heating device (160) to heat according to the preset heating power, and controlling the water pump to operate according to the first preset power, the operation interval duration, the first operation duration, and the number of operations during the heating period of the electric heating device (160), so that when the operation of the water pump ends, the temperature of the stored water is increased by the preset temperature increase value; The gas water heater further comprises a gas heating device provided on the water flow pipe (100), and the control method further comprises: When the water storage volume of the gas water heater is not obtained, controlling the water flow of the water pump at the second preset power to reach a preset heating water flow, and then starting the gas heating device for heating; During the heating period of the gas heating device, when the current outlet water temperature is greater than or equal to the preset starting temperature, collecting the inlet water flow sequence and the inlet water temperature sequence; If the water inlet temperature sequence satisfies a preset heating rule, the heating water volume is determined according to the water inlet flow sequence, and the heating water volume is used as the water storage volume of the gas water heater; the heating water volume is the water volume corresponding to the water inlet end flowing through the water flow pipe (100) when the water inlet temperature sequence satisfies the preset heating rule; The step of obtaining the average water flow of the water pump under the first preset power and the first operating time when it is detected that the gas water heater meets the preset antifreeze starting condition is performed.

2. The antifreeze control method according to claim 1, characterized in that: The inlet water temperature sequence satisfies the preset temperature rise rules, including: If a preset number of target inlet water temperature values ​​in the inlet water temperature sequence increase in temperature, and the difference between the last target inlet water temperature value and the first target inlet water temperature value among the preset number of target inlet water temperature values ​​is greater than the preset temperature difference, it is determined that the inlet water temperature sequence meets the preset heating rule; the target inlet water temperature value is the inlet water temperature value closest to the collection time and the current time, the last target inlet water temperature value is the inlet water temperature value closest to the current time among the target inlet water temperature values, and the first target inlet water temperature value is the inlet water temperature value farthest from the current time among the target inlet water temperature values.

3. The antifreeze control method according to claim 1, characterized in that: The control method further includes: When the water pump ends its operation, the current outlet water temperature is collected; If the current water outlet temperature is greater than or equal to the preset verification temperature, repeatedly performing the step of obtaining the average water flow rate of the water pump at the first preset power and first operating time when it is detected that the gas water heater meets the preset antifreeze start condition; If the current water outlet temperature is lower than the preset verification temperature, the step of starting the gas heating device for heating is repeated after the water flow of the water pump at the second preset power reaches the preset heating water flow when the water storage volume of the gas water heater is not detected.

4. The antifreeze control method according to claim 1, characterized in that: The obtaining of the average water flow rate of the water pump at the first preset power and the first operating time includes: Using the first operation duration as a first collection duration to collect an operation water flow sequence; The average water flow rate is determined according to the operating water flow rate sequence.

5. The antifreeze control method according to claim 1, characterized in that: The step of determining the number of times the water pump operates according to the pre-stored water storage volume of the gas water heater, the first operating time, and the average water flow rate includes: The ratio of the product of the water storage volume of the gas water heater and the first operation time to the average water flow rate is used as the number of operations of the water pump.

6. The antifreeze control method according to claim 1, characterized in that: According to the first operation time, the average water flow rate and the preset unit water flow rate, the formula for determining the operation interval time of the water pump is: T 运转 = (T1×L1 / L0)-T1; Among them, T 运转 is the operation interval of the water pump, L1 is the average water flow rate, T1 is the first operation time, and L0 is the unit water flow rate.

7. The antifreeze control method according to claim 6, characterized in that: The control method further includes: If the average water flow rate is less than the preset clogging alarm reminder flow rate, a clogging alarm reminder signal is output.

8. The antifreeze control method according to claim 1, characterized in that: After the water flow of the water pump at the second preset power reaches a preset heating water flow, the gas heating device is started for heating, comprising: collecting a current water flow rate of the water pump at the second preset power; During the preset second collection time period, when the current water flow rate is greater than or equal to the heating start water flow rate, the gas heating device is started for heating.

9. An antifreeze control device for a gas water heater, characterized in that: The gas water heater comprises a water pump and an electric heating device (160) arranged on a water flow pipe (100), and the control device comprises: An average water flow acquisition module (200) is used to acquire the average water flow of the water pump at a first preset power and a first operating time when it is detected that the gas water heater meets a preset antifreeze start condition; An operation number determination module (210) is used to determine the operation number of the water pump according to the pre-stored water storage volume of the gas water heater, the first operation time and the average water flow rate; an operation interval duration determination module (220) for determining the operation interval duration of the water pump according to the first operation duration, the average water flow rate, and a preset unit water flow rate; a water pump operation control module (230) for controlling the electric heating device (160) to heat according to a preset heating power, and controlling the water pump to operate according to the first preset power, the operation interval duration, the first operation duration, and the number of operations during the heating period of the electric heating device (160), so that the temperature of the stored water is increased by a preset temperature rise value when the water pump operation ends; The gas water heater further comprises a gas heating device arranged on the water flow pipe (100), and the control device further comprises a gas heating device starting module, a collection module, a judgment module and an execution module; The gas heating device starting module is used for controlling the water flow of the water pump at the second power to start heating after the water flow reaches a preset heating water flow when the water storage volume of the water flow pipe (100) is not obtained; The acquisition module is used to collect the water inlet flow sequence and the water inlet temperature sequence when the current water outlet temperature is greater than or equal to the preset starting temperature during the heating period of the gas heating device; The judgment module is used to determine the amount of water to be heated according to the water flow sequence if the water inlet temperature sequence satisfies the preset heating rule, and use the amount of water to be heated as the water storage volume of the gas water heater; the amount of water to be heated is the amount of water corresponding to the water inlet of the water flow pipe (100) when the water inlet temperature sequence satisfies the preset heating rule; The execution module is used to execute the step of obtaining the average water flow of the water pump under a first preset power and a first operating time when it is detected that the gas water heater meets a preset antifreeze start condition.

Images