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CN-121631584-B - Control method and device of gas water heater, controller and gas water heater

CN121631584BCN 121631584 BCN121631584 BCN 121631584BCN-121631584-B

Abstract

The invention relates to the technical field of hot water supply equipment and discloses a control method, a device, a controller and a gas water heater of the gas water heater, wherein the method comprises the steps of responding to a water consumption request of the gas water heater, controlling a burner to ignite and heat and maintaining a bypass ratio if a first water cut-off time between the current time and the previous water cut-off time of the gas water heater is smaller than a preset water cut-off threshold; and after delaying the target duration after the combustor is started, controlling a bypass valve of the gas water heater to be reduced from the current gear to the target gear. According to the method, the delay calculation rule corresponding to the first water cut-off time length is inquired through the preset delay rule, the delay time is adjusted pertinently according to the actual water cut-off time length, and the problem of water outlet temperature fluctuation caused by inaccurate time for adjusting the bypass ratio is avoided.

Inventors

  • Liang shaoyang

Assignees

  • 广东万和新电气股份有限公司

Dates

Publication Date
20260505
Application Date
20260204

Claims (8)

  1. 1. The control method of the gas water heater is characterized in that the gas water heater comprises a water inlet pipe (11), a water outlet pipe (12) and a bypass pipe (13), two ends of the bypass pipe (13) are respectively connected with the water inlet pipe (11) and the water outlet pipe (12), and the bypass pipe (13) is provided with a bypass valve (14), and the method comprises the following steps: Acquiring a first water cut-off time length between a current time and a previous water cut-off time of the gas water heater; If the first water cut-off duration is smaller than a preset water cut-off threshold, responding to a water use request of the gas water heater, controlling a burner of the gas water heater to ignite and heat, and maintaining a bypass ratio of the gas water heater; Determining a target duration based on the first water cut-off duration and a preset delay rule, wherein the preset delay rule is used for indicating the corresponding relation between a plurality of water cut-off duration intervals and a plurality of delay calculation rules; after delaying the target time period after the combustor is started, controlling a bypass valve of the gas water heater to be reduced from a current gear to a target gear, wherein a gear difference between the current gear and the target gear is determined based on a current heat load; The method further comprises the steps of setting a first water cut-off threshold value, wherein the first water cut-off threshold value is smaller than a preset water cut-off threshold value, and determining a target time length based on the first water cut-off time length and a preset delay rule, wherein if the first water cut-off time length is equal to the first water cut-off threshold value, determining a first target time length corresponding to the first water cut-off threshold value as the target time length; The method comprises the steps of determining a target duration based on the first water cut-off duration and a preset delay rule, determining a first shortening time corresponding to a first difference value based on the first water cut-off threshold and the first water cut-off duration if the first water cut-off duration is smaller than the first water cut-off threshold, and determining the difference value between the first target duration and the first shortening time as the target duration.
  2. 2. The method of claim 1, wherein the determining a first shortened time corresponding to the first difference based on the first difference between the first water cut-off threshold and the first water cut-off period comprises: calculating a first ratio of the first difference value to a preset time interval, and performing downward rounding on the first ratio to obtain a first coefficient; and calculating the product of the first coefficient and a first preset interval to obtain a first shortened time.
  3. 3. The method of claim 1, further setting a second water cut-off threshold, the second water cut-off threshold being greater than the first water cut-off threshold and the second water cut-off threshold being less than a preset water cut-off threshold, the determining a target time length based on the first water cut-off time length and a preset delay rule, further comprising: If the first water cut-off time length is greater than the first water cut-off threshold value and the first water cut-off time length is less than the second water cut-off threshold value, determining a second shortening time corresponding to the second difference value based on the second difference value between the second water cut-off threshold value and the first water cut-off time length; And determining the difference value between the first target duration and the second shortened time as the target duration.
  4. 4. A control method of a gas water heater according to claim 3, wherein the determining a second shortened time corresponding to a second difference value based on the second difference value between the second water cut-off threshold value and the first water cut-off period includes: Calculating a second ratio of the second difference value to a preset time interval, and performing downward rounding on the second ratio to obtain a second coefficient; and calculating a second product of the second coefficient and a second preset interval to obtain a second shortened time.
  5. 5. The method for controlling a gas water heater according to claim 3, wherein the determining the target time period based on the first water cut-off time period and a preset delay rule further comprises: If the first water cut-off time length is greater than or equal to the second water cut-off threshold value, and the first water cut-off time length is smaller than the preset water cut-off threshold value, determining a second target time length corresponding to a first interval as the target time length, wherein the upper limit of the first interval is the preset water cut-off threshold value, the lower limit of the first interval is the second water cut-off threshold value, and the second target time length is smaller than the first target time length.
  6. 6. The utility model provides a controlling means of gas heater, its characterized in that, gas heater includes inlet tube, outlet pipe and bypass pipe, the both ends of bypass pipe are connected respectively the inlet tube with the outlet pipe, the bypass pipe is equipped with the bypass valve, the device includes: the time length calculation module is used for obtaining a first water cut-off time length between the current time and the previous water cut-off time of the gas water heater; The heating module is used for responding to a water consumption request of the gas water heater, controlling the ignition heating of a burner of the gas water heater and maintaining the bypass ratio of the gas water heater if the first water cut-off time length is smaller than a preset water cut-off threshold; The target duration determining module is used for determining target duration based on the first water-stop duration and a preset delay rule, wherein the preset delay rule is used for indicating the corresponding relation between a plurality of water-stop duration intervals and a plurality of delay calculation rules; a delay module for controlling a bypass valve of the gas water heater to be reduced from a current gear to a target gear after delaying the target time period after the burner is started, wherein a gear difference between the current gear and the target gear is determined based on a current heat load; The device also sets a first water cut-off threshold value, wherein the first water cut-off threshold value is smaller than a preset water cut-off threshold value, and the target duration determining module further comprises a first determining unit, a second determining unit and a second determining unit, wherein the first determining unit is used for determining a first target duration corresponding to the first water cut-off threshold value as the target duration if the first water cut-off duration is equal to the first water cut-off threshold value; The target duration determining module further comprises a first shortening time determining unit, a second determining unit and a control unit, wherein the first shortening time determining unit is used for determining a first shortening time corresponding to a first difference value based on the first difference value between the first water stopping threshold value and the first water stopping duration if the first water stopping duration is smaller than the first water stopping threshold value, and the second determining unit is used for determining the difference value between the first target duration and the first shortening time as the target duration.
  7. 7. A controller for a gas water heater, the controller comprising: A memory and a processor, the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions, thereby executing the control method of the gas water heater according to any one of claims 1 to 5.
  8. 8. A gas water heater is characterized in that, the gas water heater includes the controller of claim 7.

Description

Control method and device of gas water heater, controller and gas water heater Technical Field The invention relates to the technical field of hot water supply equipment, in particular to a control method and device of a gas water heater, a controller and the gas water heater. Background After the gas water heater is closed, water flow is stopped, the burner is flameout, but the waste heat of high-temperature components such as a combustion chamber, a heat exchanger and the like can continuously heat water in the heat exchanger, so that the temperature of the water is far higher than the set temperature, and high-temperature water is formed. When the gas water heater is started again after being turned off briefly, the combustor ignites to a period when the heat exchanger reaches rated heating power, and an ignition energy blank period exists, and cold water which flows in newly cannot be heated sufficiently in the ignition energy blank period, namely flows out, so that the temperature of the water outlet is too low. In contrast, in the related art, after receiving a new water use request, the burner of the gas water heater ignites again to burn, the bypass ratio is first maintained or increased, and cold water in the bypass line is mixed with high-temperature water initially flowing out of the heat exchanger, and the high-temperature water in the initial stage is neutralized. Then, the opening of the bypass valve is reduced to reduce the bypass ratio (i.e., the shut-down valve is returned), thereby releasing the heat energy stored during the water shut-down period, and the heat energy is used to supplement the energy shortage in the ignition energy blank period, so as to avoid the outflow of cold water. The triggering time of reducing the opening of the bypass valve is difficult to accurately control, if the bypass ratio is reduced too early, the high-temperature water generated by waste heat in the heat exchanger is not completely discharged, the released heat energy is overlapped with the high-temperature water to cause the temperature rise of water outlet, if the bypass ratio is adjusted too late, a large amount of cold water is shunted by the bypass pipeline in the blank period of ignition energy, and the heat gap is difficult to compensate, so that the temperature drop of water outlet is caused. Based on this, how to determine the moment of reducing the opening of the bypass valve after the gas water heater is started for the second time is a current problem to be solved urgently. Disclosure of Invention The invention aims to provide a control method and device of a gas water heater, a controller and the gas water heater, which effectively solve the problem of fluctuation of outlet water temperature after the gas water heater is restarted. The technical problems are solved by the following technical scheme: A control method of a gas water heater, the gas water heater comprising a water inlet pipe (11), a water outlet pipe (12) and a bypass pipe (13), both ends of the bypass pipe (13) are respectively connected with the water inlet pipe (11) and the water outlet pipe (12), the bypass pipe (13) is provided with a bypass valve (14), the method comprising: Acquiring a first water cut-off time length between a current time and a previous water cut-off time of the gas water heater; If the first water cut-off duration is smaller than a preset water cut-off threshold, responding to a water use request of the gas water heater, controlling a burner of the gas water heater to ignite and heat, and maintaining a bypass ratio of the gas water heater; Determining a target duration based on the first water cut-off duration and a preset delay rule, wherein the preset delay rule is used for indicating the corresponding relation between a plurality of water cut-off duration intervals and a plurality of delay calculation rules; and after the target time period is delayed after the combustor is started, controlling a bypass valve of the gas water heater to be reduced from a current gear to a target gear, wherein a gear difference between the current gear and the target gear is determined based on a current heat load. Compared with the background technology, the control method of the gas water heater has the advantages that the control method of the gas water heater comprises the steps of obtaining first water stopping time between the current time and the previous water stopping time of the gas water heater, controlling a burner of the gas water heater to ignite and heat and maintain the bypass ratio of the gas water heater if the first water stopping time is smaller than a preset water stopping threshold value, determining target time based on the first water stopping time and a preset delay rule, wherein the preset delay rule is used for indicating the corresponding relation between a plurality of water stopping time intervals and a plurality of delay calculation rules, and controlling a bypass valve of the gas water he