CN110207392B - Method for correcting current function relationship between fan and proportional valve - Google Patents
Method for correcting current function relationship between fan and proportional valve Download PDFInfo
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- CN110207392B CN110207392B CN201811277542.8A CN201811277542A CN110207392B CN 110207392 B CN110207392 B CN 110207392B CN 201811277542 A CN201811277542 A CN 201811277542A CN 110207392 B CN110207392 B CN 110207392B
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- 238000000034 method Methods 0.000 title claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 91
- 238000002485 combustion reaction Methods 0.000 claims abstract description 46
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 50
- 230000033228 biological regulation Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241000233805 Phoenix Species 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
Abstract
The invention discloses a method for correcting a current functional relation between a fan and a proportional valve, which comprises the steps of respectively determining the maximum combustion load Qmax and the minimum combustion load Qmin of a water heater under the current atmospheric pressure by combining the maximum current and the minimum current of the proportional valve in the water heater, and correcting a fan current and proportional valve current functional relation curve F (I) according to the maximum combustion load Qmax and the minimum combustion load Qmin. According to the method, the load of the water heater is calculated when the maximum output and the minimum output of the proportional valve are achieved under the current environment, the maximum output and the minimum output of the proportional valve are compared and replaced with the preset maximum output and the preset minimum output of the proportional valve, the corresponding relation between the output magnitude of the proportional valve control signal and the output load of the water heater is adjusted, and the fan current of the water heater is accurately adjusted according to the corresponding relation between the output load and the fan current.
Description
Technical Field
The invention relates to the field of control of gas water heaters, in particular to a method for correcting a current function relation between a fan and a proportional valve.
Background
The combustion performance of the constant-temperature water heater is influenced by multiple factors (altitude, gas supply pressure and gas composition) to cause the drift of the original parameters of the water heater. The actual load of the gas water heater with too high altitude is lower; the air supply pressure of the fuel gas is too low, so that the air-fuel ratio is not suitable for combustion, and flameout is caused, and the deviation of the fuel gas components is too large, so that the combustion load of the water heater cannot meet the actual requirement, and flameout is caused by improper air-fuel ratio. To this current gas heater through the secondary pressure that detects gas nozzle and calculate corresponding load, but the influence that influences gas heater work efficiency is a lot, and the atmospheric pressure and the gas quality of environmental atmospheric pressure gas air feed etc. are just according to the regulation of secondary pressure control proportional valve and can produce the error, influence the accurate control of proportional valve and fan.
Disclosure of Invention
In order to overcome the disadvantages of the prior art, the invention aims to provide a method for accurately adjusting the control parameters of a proportional valve under the action of various influencing factors.
The method provided by the invention comprises the following steps:
a method for correcting the current function relation between a fan and a proportional valve comprises the steps of respectively determining the maximum combustion load Qmax and the minimum combustion load Qmin of a water heater under the current atmospheric pressure by combining the maximum current and the minimum current of the proportional valve in the water heater, and correcting a fan current and proportional valve current function relation curve F (I) according to the maximum combustion load Qmax and the minimum combustion load Qmin.
Further, correcting the fan current and proportional valve current function relation curve f (i), specifically comprising: and under the condition that the air source is determined to have larger difference with the standard air source, correcting the linear relation of the proportional valve current and the fan current to be j F (I) according to the proportional relation between Qmax and the preset maximum combustion load Qmax0 or the proportional relation j between Qmin and the preset maximum combustion load Qmin0, wherein j is Qmax/Qmax0 or j is Qmin/Qmin 0.
Further, after modifying the linear relationship between the proportional valve current and the fan current to j F (I), the method includes: under the condition that the secondary pressure of the gas nozzle is deviated, the linear relation between the proportional valve current and the fan current is corrected to be ij F (I) according to the proportional relation I between the secondary pressure and the preset secondary pressure, namely P2/Pmax0 or I, namely P21/Pmin 0.
Further, the method for determining a state of secondary pressure occurrence deviation of the gas nozzle specifically includes: determining the maximum secondary pressure of the current gas nozzle according to the difference value of the maximum gas pressure P1 and the current atmospheric pressure P0 of the gas nozzle, determining the minimum secondary pressure of the current gas nozzle according to the difference value of the minimum gas pressure P2 and the current atmospheric pressure P0 of the gas nozzle, and comparing the secondary pressure of the current gas nozzle with the secondary pressure of the preset water heater according to the corresponding relation between the preset water heater load and the secondary pressure to determine the secondary pressure of the gas nozzle to be deviated and the deviation is within a preset range.
Further, the method for judging the large difference between the air source and the standard air source specifically comprises the following steps: and determining that the difference between the air source and the standard air source is larger according to the condition that the difference between Qmax and the preset maximum load Qmax0 of the water heater or the difference between Qmin and the preset minimum load Qmin0 of the water heater is larger than the preset value.
Further, the fan current and proportional valve current function relation curve f (i) is corrected, and the method specifically comprises the following steps: and determining a linear relation between the proportional valve current and the water heater load according to the preset corresponding relation between the preset water heater load and the fan current.
Further, the method includes determining a coefficient k between the current air pressure P1 and the standard air pressure P0 to be P1/P0, wherein a difference between kQmax and a preset maximum combustion load Qmax0 is smaller than a preset value, a difference between kQmin and a preset maximum combustion load Qmin0 is smaller than a preset value, and kQmax corresponds to a proportional valve maximum current and kQmin corresponds to a proportional valve minimum current.
Further, determining the maximum combustion load Qmax and the minimum combustion load Qmin of the water heater specifically comprises: and determining the load Qmax of the water heater under the maximum power and the load Qmin under the minimum power according to the water volume heated in the preset time, the water inlet temperature and the water outlet temperature.
Further, after determining the maximum combustion load Qmax and the minimum combustion load Qmin of the water heater, the method further comprises: and determining that the coefficient k between the current air pressure P1 and the standard air pressure P0 is P1/P0, and determining that the air supply is abnormal according to the condition that the difference value between kQmax and the preset maximum combustion load Qmax0 is larger than a preset value.
Further, after determining the maximum combustion load Qmax and the minimum combustion load Qmin of the water heater, the method further comprises: and determining the difference between the output air pressures Pmax and Pmin of the gas nozzle and the current atmospheric pressure under the maximum output current and the minimum output current, and determining that the current gas pressure is abnormal outside the value range of the secondary pressure of the gas nozzle.
Compared with the prior art, the method has the advantages that the load of the water heater is calculated when the maximum output and the minimum output of the proportional valve are realized in the current environment, the maximum output and the minimum output of the proportional valve are compared and replaced with the preset maximum output and the preset minimum output of the proportional valve, the corresponding relation between the output magnitude of the proportional valve control signal and the output load of the water heater is adjusted, and the fan current of the water heater is accurately adjusted according to the corresponding relation between the output load and the fan current.
Drawings
FIG. 1 is a flow chart of a method for correcting a current functional relationship between a fan and a proportional valve according to the present invention.
FIG. 2 is a flow chart of a correction process of a correction method of a fan and proportional valve current functional relationship according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, an embodiment of the present invention provides a control and regulation method for a proportional valve, including: under the control of the maximum current, when the maximum gas output quantity is reached, the water heater operates under the maximum power, the gas pressure at the output end of the gas nozzle under the maximum power is determined to be the working gas pressure Pmax of the water heater under the maximum power, and the load Qmax of the gas water heater under the current environment maximum power is determined according to the water flow in the preset time, the water inlet temperature Lmax1 and the water outlet temperature Lmax 2.
And under the control of the minimum current, when the gas output quantity is the minimum, the water heater operates under the minimum power, the gas pressure at the output end of the gas nozzle under the maximum power is determined to be the working gas pressure Pmin of the water heater under the minimum power, and the load Qmin of the gas water heater under the current environment minimum power is determined according to the water flow in the preset time, the water inlet temperature Lmin1 and the water outlet temperature Lmin 2.
And the water heater determines the corresponding relation between the fan current and the proportional valve current according to the preset corresponding relation between the load and the fan current.
The gas water heater usually controls the output quantity of gas in a form of a proportional valve, the flow of the proportional valve is controlled by the current, the corresponding relation between the current and the opening and closing of the proportional valve is preset in the water heater, because the opening and closing of the proportional valve directly determines the load generated by the gas in a standard environment, and the linear relation is formed between the current and the load generated by the gas, the linear relation between the current and the preset value is stored in the gas water heater, the size of the proportional valve is adjusted according to the load required to be carried by the water heater, in the actual use process, because of the change of the altitude, the secondary pressure is different in different time periods due to too low gas supply pressure, the heat efficiency of the gas is different due to the different qualities of the gas, when the proportional valve is controlled to be in the preset size by the current, the gas nozzle cannot give out a proper amount of combustible, resulting in differences in the water heater load from the preset value.
The exhaust fan is used for assisting the circulation of air, providing proper amount of air for combustion and discharging exhaust gas to prevent the retention of harmful gases such as carbon monoxide, the rotation number of the exhaust fan is controlled by the current loaded on the fan, the rotation number of the exhaust fan is adapted to the load loaded by the water heater, the proper air intake amount and exhaust amount are provided, the load loaded by the water heater is linearly related to the current loaded on the proportional valve, so the rotation number of the exhaust fan can be determined by the current loaded on the proportional valve, the water heater is preset with the rotation number s of the exhaust fan, namely F (I), wherein I is the current loaded on the proportional valve, and the rotation number s of the exhaust fan is adjusted according to the proportional relation between Qmax and Qmax0, so that s is jF (I). As such, the exhaust fan can operate at a number of revolutions commensurate with the water heater.
Further, the water heater determines that the current air pressure P1 is the sea level atmospheric pressure P0 and the water heater working air pressure Pmin is within the upper and lower limits of the secondary pressure of the proportional valve under the maximum power and the minimum power.
The water heater adjusts the preset values according to the load at maximum power and the load at minimum power in the current environment so that Qmax0 is Qmax and Qmin0 is Qmin.
And adjusting the corresponding relation between the preset fan current and the proportional valve current according to the fact that the difference between the load Qmax under the current environment maximum power and the load Qmin under the current environment minimum power and the preset value is larger than a first threshold value, and according to the fact that the coefficient j of the load under the current environment maximum power relative to the preset value is Qmax/Qmax0 or j is Qmin/Qmin 0.
According to the working air pressures Pmax and Pmin and the air pressure P1 of the current environment, determining a secondary pressure Pmax1 of the water heater under the maximum current of the stop valve and a secondary pressure Pmin1 of the water heater under the minimum current of the stop valve, wherein the difference value of the Pmax1 and a preset value Pmax0 is within fifty percent, the difference value of the Pmin1 and a preset value Pmin0 is within fifty percent, and according to the proportional coefficient of the Pmax1 and the Pmax0 or the proportional coefficient of the Pmin1 and the Pmin0, i-Pmax 1/Pmax0 or i-Pmin 1/Pmin0, the corresponding relation of the fan current and the proportional valve current is adjusted, so that s-iF (I) is adjusted.
The method comprises the steps that when a water heater is in a debugging mode, the current air pressure is obtained firstly, the current air pressure is determined to be sea level atmospheric pressure, a threshold value is preset in actual operation, when the pressure detected by a pressure sensor is within a preset threshold value range, the current air pressure is determined to be sea level atmospheric pressure, then, the water heater operates under the maximum power, the pressure sensor detects the pressure of a gas nozzle and is the working air pressure Pmax of the water heater under the maximum power, and the load Qmax of the water heater is determined according to the water flow heated in a preset time period and the temperature changes of a water inlet and a water outlet; similarly, the water heater determines the working air pressures Pmin and Qmin of the water heater under the minimum power, and Pmax and Pmin are within the pressure range set by the water heater, and no potential safety hazard is generated, then the upper limit of the load of the water heater in the preset value is adjusted to enable Qmax0 to be Qmax and the lower limit of the load of the water heater in the preset value is adjusted to enable Qmin0 to be Qmin, and the linear relation between the current on the proportional valve and the load carried by the water heater is determined again. The effects of accurately controlling the output of combustible gas and effectively controlling the temperature of hot water are achieved.
When the coefficient j of the load relative to the preset value under the maximum power of the current environment is larger than the preset value, the fact that the load generated by the water heater under the current gas pressure is inconsistent with the preset load is shown, the gas used by the water heater and the standard gas have a large difference value above combustion heat, the hidden danger that flame is extinguished due to the original fan rotating speed is kept at the moment, the corresponding relation between the proportional valve current and the fan current is adjusted, the fan rotating speed is influenced by adjusting the fan current according to the coefficient j, and the fan rotating speed is matched with the load of the water heater.
The rotating speed of the exhaust fan during working is adaptive to the secondary pressure generated by the water heater, and an excessively high rotating speed may cause flameout.
As shown in fig. 2:
step S100: and determining the maximum output and the minimum output of the proportional valve under the current environment.
Step S200: and determining the proportional relation k between the current atmospheric pressure and the standard atmospheric pressure.
Step S300: and determining the corresponding relation between the load and the proportional valve current.
Step S400: and determining the ratio j of the upper limit and the lower limit of the load of the water heater to the preset load.
Step S500: and determining the secondary pressure of the gas nozzle and a preset secondary upper-lower limit ratio i.
Step S600: and correcting the relation between the fan current and the proportional valve current according to the load.
In another embodiment, the water heater determines that the current air pressure is not equal to the sea level air pressure, determines that the coefficient k of the current air pressure relative to the sea level air pressure is P1/P0, compares the load Qmax0 at the maximum power of the current environment with the load Qmax at the maximum power of the preset value according to the product of the coefficient k of the current air pressure relative to the sea level air pressure, determines that the difference between kQmax0 and Qmax is less than the preset value, and corrects the preset value according to the load Qmax at the maximum power of the current environment so that Qmax0 is Qmax. And comparing the product kQmin0 of the coefficient k of the current air pressure relative to the sea level air pressure and the load under the minimum power of the preset value with the load Qmin under the maximum power of the current environment, determining that the difference value between kQmin0 and Qmin is smaller than the preset value, and correcting the preset value according to the load Qmin under the maximum power of the current environment to ensure that Qmin0 is Qmin.
In another embodiment, the working air pressures Pmax and Pmin at the maximum power of the water heater are out of the range of the upper and lower secondary limits of the proportional valve, and the insufficient air supply is determined.
In the actual use process, because the pipe network design is not standard and the phenomenon of insufficient air pressure can be generated in the air supply concentration, the current insufficient air supply is determined by judging that the working air pressure of the water heater under the maximum power and the minimum power is not in the upper and lower limit ranges of the proportional valve, particularly is lower than the pressure lower limit of the proportional valve. The controller can send out early warning in the modes of phoenix sounding, display screen display and the like to require a user to overhaul.
In another embodiment, a secondary pressure Pmax1 of the water heater at a maximum current of the cutoff valve and a secondary pressure Pmin1 of the water heater at a minimum current of the cutoff valve are determined according to the working air pressures Pmax and Pmin and the air pressure P1 of the current environment, and a gas pressure abnormality is determined according to whether a difference between Pmax1 and a preset value Pmax0 is more than fifty percent or a difference between Pmin1 and a preset value Pmin0 is more than fifty percent.
In another embodiment, the difference between kQmax0 and Qmax is greater than a predetermined value, or the difference between kQmin0 and Qmin is greater than a predetermined value, and Qmax or Qmin is determined to be abnormal.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A method for correcting a current functional relation between a fan and a proportional valve is characterized by comprising the following steps: the method comprises the steps of respectively determining the maximum combustion load Qmax and the minimum combustion load Qmin of the water heater under the current atmospheric pressure by combining the maximum current and the minimum current of a proportional valve in the water heater, and correcting a fan current and proportional valve current function relation curve F (I) according to the maximum combustion load Qmax and the minimum combustion load Qmin;
correcting a fan current and proportional valve current function relation curve F (I), and specifically comprising the following steps: under the condition that the difference between an air source and a standard air source is large, correcting the linear relation between the fan current and the proportional valve current to be j F (I) according to the proportional relation between Qmax and a preset maximum combustion load Qmax0 or the proportional relation between Qmin and a preset minimum combustion load Qmin0, wherein j = Qmax/Qmax0 or j = Qmin/Qmin 0;
after correcting the linear relationship between the fan current and the proportional valve current to j F (I), the method includes: correcting the linear relation of the fan current and the proportional valve current to be ij F (I) according to the proportional relation between the secondary pressure and the preset secondary pressure, I = Pmax1/Pmax0 or I = Pmin1/Pmin0 in the state that the secondary pressure of the gas nozzle has deviation;
the method for judging the state of the secondary pressure occurrence deviation of the gas nozzle specifically comprises the following steps: determining the maximum secondary pressure Pmax1 of the current gas nozzle according to the difference value between the maximum working air pressure Pmax of the gas nozzle and the current atmospheric pressure P1, determining the minimum secondary pressure Pmin1 of the current gas nozzle according to the difference value between the minimum working air pressure Pmin of the gas nozzle and the current atmospheric pressure P1, and determining the secondary pressure occurrence deviation of the gas nozzle and enabling the deviation to be within a preset range according to the comparison between the corresponding relation of the combustion load of a preset water heater and the secondary pressure of the current gas nozzle.
2. The method for correcting the current functional relation between the fan and the proportional valve according to claim 1, wherein the method comprises the following steps: the method for judging the large difference between the air source and the standard air source specifically comprises the following steps: and determining that the difference between the air source and the standard air source is larger according to the condition that the difference between Qmax and the preset maximum combustion load Qmax0 or between Qmin and the preset minimum combustion load Qmin0 is larger than the preset value.
3. The method for correcting the current functional relation between the fan and the proportional valve according to claim 1 or 2, wherein the method comprises the following steps: correcting a fan current and proportional valve current function relation curve F (I), and specifically comprising the following steps: and determining a linear relation between the proportional valve current and the water heater combustion load according to the correspondence between the maximum combustion load Qmax and the proportional valve maximum current and the correspondence between the minimum combustion load Qmin and the proportional valve minimum current, and determining the correspondence between the fan current and the proportional valve current according to the preset correspondence between the water heater combustion load and the fan current.
4. The method for correcting the current functional relation between the fan and the proportional valve according to claim 3, wherein the method comprises the following steps: the method further comprises the steps of determining a coefficient k = P1/P0 between the current atmospheric pressure P1 and the standard atmospheric pressure P0, comparing kQmax0 which is the product of the coefficient k and the preset maximum combustion load with Qmax which is the current environment, determining that the difference value between kQmax0 and Qmax is smaller than the preset value, and correcting the preset value according to Qmax so that Qmax0= Qmax; and comparing the product kQmin0 of the coefficient k and the preset minimum combustion load with the current environment minimum combustion load Qmin, determining that the difference value between kQmin0 and Qmin is smaller than the preset value, and correcting the preset value according to Qmin to ensure that Qmin0= Qmin.
5. The method for correcting the current functional relation between the fan and the proportional valve according to claim 1 or 2, wherein the method comprises the following steps: determining the maximum combustion load Qmax and the minimum combustion load Qmin of the water heater, and specifically comprising the following steps: and determining the load Qmax of the water heater under the maximum power and the load Qmin under the minimum power according to the water volume heated in the preset time, the water inlet temperature and the water outlet temperature.
6. The method for correcting the current functional relation between the fan and the proportional valve according to claim 1, wherein the method comprises the following steps: after determining the maximum combustion load Qmax and the minimum combustion load Qmin of the water heater, the method further comprises: determining a coefficient k = P1/P0 between the current atmospheric pressure P1 and the standard atmospheric pressure P0, and determining that the air supply is abnormal according to the fact that the difference value between kQmax0 and Qmax is larger than a preset value.
7. The method for correcting the current functional relation between the fan and the proportional valve according to claim 1, wherein the method comprises the following steps: after determining the maximum combustion load Qmax and the minimum combustion load Qmin of the water heater, the method further comprises: and determining that the current gas pressure is abnormal when the difference value between the working air pressures Pmax and Pmin of the gas nozzle and the current atmospheric pressure is out of the value range of the secondary pressure of the gas nozzle under the condition of determining the maximum current and the minimum current of the proportional valve.
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| CN111578525B (en) * | 2019-10-18 | 2021-11-16 | 华帝股份有限公司 | Calibration method of proportional valve of gas water heater |
| CN110926032B (en) * | 2019-11-01 | 2021-05-18 | 华帝股份有限公司 | Fan air volume adjusting method for gas water heater and gas water heater |
| CN111609560B (en) * | 2020-04-20 | 2022-05-31 | 芜湖美的厨卫电器制造有限公司 | Control method of gas water heater, gas water heater and computer readable storage medium |
| CN111964269B (en) * | 2020-07-27 | 2022-01-11 | 广东万和新电气股份有限公司 | Gas water heater and automatic judgment and control method for rotating speed precision of fan of gas water heater |
| CN113485466B (en) * | 2021-06-30 | 2023-10-24 | 深圳市科曼医疗设备有限公司 | Proportional valve control method, proportional valve control device, computer equipment and readable storage medium |
| WO2023272542A1 (en) * | 2021-06-30 | 2023-01-05 | 深圳市科曼医疗设备有限公司 | Proportional valve control method and apparatus, computer device and readable storage medium |
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