CN111578525B - Calibration method of proportional valve of gas water heater - Google Patents
Calibration method of proportional valve of gas water heater Download PDFInfo
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- CN111578525B CN111578525B CN202010460514.0A CN202010460514A CN111578525B CN 111578525 B CN111578525 B CN 111578525B CN 202010460514 A CN202010460514 A CN 202010460514A CN 111578525 B CN111578525 B CN 111578525B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005070 sampling Methods 0.000 claims abstract description 30
- 238000002485 combustion reaction Methods 0.000 claims abstract description 19
- 230000001276 controlling effect Effects 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 160
- 238000013459 approach Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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Abstract
The invention discloses a calibration method of a proportional valve of a gas water heater, which comprises the following steps: controlling the gas water heater to enter a normal combustion mode; judging whether the gas water heater enters a normal combustion mode or not, and controlling the proportional valve to adjust the opening degree to be calibrated if the gas water heater enters the normal combustion mode; controlling the proportional valve to work for a preset time under the opening degree to be calibrated; sampling the current gas pressure of the gas water heater; judging whether the current gas pressure of the gas water heater meets a preset condition or not, and determining whether to adjust the proportional valve current or to sample the current gas pressure of the gas water heater again according to a judgment result; it can promote calibration efficiency and calibration accuracy.
Description
Technical Field
The invention relates to the technical field of kitchen electricity, in particular to a calibration method of a proportional valve of a gas water heater.
Background
The existing gas water heaters are all constant-temperature gas water heaters, the constant-temperature gas water heaters calculate the current load by collecting the water inlet temperature, the water outlet temperature and the water flow to control the opening degree of a proportional valve, and each load corresponds to the opening degree of one proportional valve. Because the proportional valve controls the opening degree of the proportional valve by converting the current output by the controller into electromagnetic force, and the structure and the performance difference of the proportional valve are larger, namely different proportional valves, even if the controller outputs the same current, the opening degrees of the proportional valves are also different, so that the load difference output by the gas water heater is larger. Therefore, before each gas water heater leaves a factory, the corresponding load of the opening of the proportional valve must be calibrated, the prior art is manually operated, the efficiency is low, and the calibration precision is difficult to guarantee.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the related art to some extent, and therefore the present invention is directed to a calibration method for a proportional valve of a gas water heater, which can improve calibration efficiency and calibration accuracy.
The above purpose is realized by the following technical scheme:
a calibration method for a proportional valve of a gas water heater comprises the following steps:
controlling the gas water heater to enter a normal combustion mode;
judging whether the gas water heater enters a normal combustion mode or not, and controlling the proportional valve to adjust the opening degree to be calibrated if the gas water heater enters the normal combustion mode;
controlling the proportional valve to work for a preset time under the opening degree to be calibrated;
sampling the current gas pressure of the gas water heater;
and judging whether the current gas pressure of the gas water heater meets a preset condition or not, and determining whether to adjust the proportional valve current or to sample the current gas pressure of the gas water heater again according to a judgment result.
In some embodiments, the step of sampling the current gas pressure of the gas water heater specifically comprises:
sampling at least 2 groups of gas pressure data, taking the median of each group of gas pressure data, and taking the average value of all the medias as the current gas pressure of the gas water heater;
each group of gas pressure data comprises a plurality of gas pressure data obtained by sampling at intervals, and the plurality of gas pressure data are sequenced to obtain a median of the gas pressure data.
In some embodiments, the step of determining whether to adjust the proportional valve current or to sample the current gas pressure of the gas water heater again according to the determination result specifically includes:
if the current gas pressure of the gas water heater does not meet the preset condition, regulating the proportional valve current;
and if the current gas pressure of the gas water heater meets the preset condition, counting, and sampling the current gas pressure of the gas water heater again.
In some embodiments, when the number of continuous counts reaches a preset number, the proportional valve is controlled to adjust to another opening to be calibrated, and the steps of controlling the proportional valve to work for a preset duration at the opening to be calibrated, sampling the current gas pressure of the gas water heater, and judging whether the current gas pressure of the gas water heater meets a preset condition are repeated.
In some embodiments, the step of adjusting the proportional valve current is specifically:
if the current gas pressure of the gas water heater is smaller than the preset gas pressure range of the preset condition, increasing the current of the proportional valve;
and if the current gas pressure of the gas water heater is larger than the preset gas pressure range of the preset condition, reducing the current of the proportional valve.
In some embodiments, if the current gas pressure of the gas water heater is smaller than the preset gas pressure range of the preset condition, the current increased by the proportional valve in the step of increasing the current of the proportional valve is: k (Q)1-Q)/10, where K is the coefficient, Q is the current gas pressure, Q1The gas pressure of the proportional valve in the opening state to be calibrated;
after adjusting the proportional valve current, waiting time (Q)1-Q) seconds, and the current gas pressure of the gas water heater is sampled again.
In some embodiments, if the current gas pressure of the gas water heater is greater than the preset gas pressure range of the preset condition, the current for controlling the proportional valve to decrease in the step of decreasing the current of the proportional valve is: kx (Q-Q)1) 10, where K is the coefficient, Q is the current gas pressure, Q1The gas pressure of the proportional valve in the opening state to be calibrated;
after adjusting the proportional valve current, waiting time (Q-Q)1) And secondly, sampling the current gas pressure of the gas water heater again.
In some embodiments, 0.7 × I0≤K≤0.9×I0In which I0The current value of the proportional valve is 10PA gas pressure.
In some embodiments, K × (Q)1-Q)/10 is less than or equal to 10 xK, wherein K is a coefficient, Q is the current gas pressure, and Q is1The gas pressure of the proportional valve in the opening state to be calibrated;
or, Kx (Q-Q)1) 10 is less than or equal to 10 multiplied by K, wherein K is a coefficient, Q is the current gas pressure, and Q is1The gas pressure of the proportional valve in the opening state to be calibrated is obtained.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. the calibration method of the proportional valve of the gas water heater can improve calibration efficiency and calibration precision.
Drawings
FIG. 1 is a schematic structural diagram of a gas water heater in an embodiment of the invention;
fig. 2 is a schematic flow chart of a calibration method according to an embodiment of the present invention.
Detailed Description
The present invention is illustrated by the following examples, but the present invention is not limited to these examples. Modifications to the embodiments of the invention or equivalent substitutions of parts of technical features without departing from the spirit of the invention are intended to be covered by the scope of the claims of the invention.
The first embodiment is as follows: as shown in fig. 1 and fig. 2, the present embodiment provides a calibration method for a proportional valve of a gas water heater, and a calibration system for implementing the calibration method includes a gas water heater 1, a digital display barometer 2, and an automatic debugging dedicated controller 3, where the digital display barometer 2 is connected to a pressure measurement location at a rear end of the proportional valve of the gas water heater through a pressure measurement tube, the automatic debugging dedicated controller 3 samples with the digital display barometer 2 through a data line, the automatic debugging dedicated controller 3 is connected to a controller 4 of the gas water heater, 2000PA standard natural gas is input to a gas inlet (2000PA is a user's standard gas pressure), and the gas pressure can be adjusted to 0-2000 PA gas pressure after passing through the proportional valve. The load during combustion varies with pressure. The combustion load is larger as the gas pressure is larger. The loads corresponding to different combustion structures will also be different for the same air pressure. The calibration method provided by the implementation comprises the following steps:
controlling the gas water heater to enter a normal combustion mode;
judging whether the gas water heater enters a normal combustion mode or not, and controlling the proportional valve to adjust the opening degree to be calibrated if the gas water heater enters the normal combustion mode;
controlling the proportional valve to work for a preset time under the opening degree to be calibrated;
sampling the current gas pressure of the gas water heater;
and judging whether the current gas pressure of the gas water heater meets a preset condition or not, and determining whether to adjust the proportional valve current or to sample the current gas pressure of the gas water heater again according to a judgment result.
The calibration method of the gas water heater proportional valve of the embodiment can improve calibration efficiency and calibration accuracy.
Specifically, the full-automatic calibration method provided by the embodiment can replace the existing manual test calibration method, the opening degree of the corresponding proportional valve under different loads can be fully automatically calibrated, and the accuracy is higher.
In addition, the air valve and the water valve can be automatically debugged and calibrated only by manually opening the air valve and the water valve, and the debugging and the calibration can be quickly adjusted through estimation, so that the speed is higher, and the labor cost is saved.
In addition, during debugging and calibration, the adjustment can be performed after corresponding waiting according to the inertia characteristic of the proportional valve, the adjustment is more accurate and standard, and the problem that the manual debugging possibly causes large adjustment error is avoided.
Preferably, the step of sampling the current gas pressure of the gas water heater specifically comprises:
sampling at least 2 groups of gas pressure data, taking the median of each group of gas pressure data, and taking the average value of all the medias as the current gas pressure of the gas water heater;
each group of gas pressure data comprises a plurality of gas pressure data obtained by sampling at intervals, and the plurality of gas pressure data are sequenced to obtain a median of the gas pressure data.
Therefore, the accuracy of gas pressure sampling can be improved, sampling errors are reduced, and the accuracy of proportional valve calibration is improved.
Further, the step of determining whether to adjust the proportional valve current or to sample the current gas pressure of the gas water heater again according to the judgment result specifically includes:
if the current gas pressure of the gas water heater does not meet the preset condition, regulating the proportional valve current, and calibrating the opening of the proportional valve;
if the current gas pressure of the gas water heater meets the preset condition, counting is carried out, the current gas pressure of the gas water heater is sampled again, and the accuracy of the calibration of the proportional valve is improved through repeated sampling, comparison, judgment and calibration.
Furthermore, when the continuous counting times reach the preset times, the proportional valve is controlled to be adjusted to another opening to be calibrated, the steps of working for the preset time length under the opening to be calibrated, sampling the current gas pressure of the gas water heater and judging whether the current gas pressure of the gas water heater meets the preset conditions are repeatedly controlled, and the accuracy of the proportional valve calibration is improved through multiple times of sampling, comparing, judging and calibrating.
In this embodiment, the step of adjusting the proportional valve current specifically includes:
if the current gas pressure of the gas water heater is smaller than the preset gas pressure range of the preset condition, increasing the current of the proportional valve;
and if the current gas pressure of the gas water heater is larger than the preset gas pressure range of the preset condition, reducing the current of the proportional valve.
Through the above steps, the opening degree of the proportional valve can be thereby calibrated.
Preferably, if the current gas pressure of the gas water heater is smaller than the preset gas pressure range of the preset condition, the current increased by the proportional valve in the step of increasing the current of the proportional valve is controlled as follows: k (Q)1-Q)/10, where K is the coefficient, Q is the current gas pressure, Q1The gas pressure of the proportional valve in the opening state to be calibrated;
after adjusting the proportional valve current, waiting time (Q)1-Q) seconds, and the current gas pressure of the gas water heater is sampled again. During calibration, the adjustment can be performed after corresponding waiting according to the inertia characteristic of the proportional valve, the adjustment is more accurate and standard, and the problem that the adjustment error is large due to manual debugging is avoided.
Preferably, if the current gas pressure of the gas water heater is greater than the preset gas pressure range of the preset condition, the current for controlling the proportional valve to reduce in the step of reducing the current of the proportional valve is as follows: kx (Q-Q)1) 10, where K is the coefficient, Q is the current gas pressure, Q1The gas pressure of the proportional valve in the opening state to be calibrated;
after adjusting the proportional valve current, waiting time (Q-Q)1) And secondly, sampling the current gas pressure of the gas water heater again. During calibration, the adjustment can be performed after corresponding waiting according to the inertia characteristic of the proportional valve, the adjustment is more accurate and standard, and the problem that the adjustment error is large due to manual debugging is avoided.
Preferably, 0.7 × I0≤K≤0.9×I0In which I0The value of the current value of the proportional valve and the value of K are reasonable under the condition of 10PA gas pressure, so that the proportional valve can be suitable for adjusting the current of the proportional valve, and the opening degree of the proportional valve meets the requirement. More preferably, k is 0.8 × I0。
In this embodiment, K × (Q)1-Q)/10 is less than or equal to 10 xK, wherein K is a coefficient, Q is the current gas pressure, and Q is1The gas pressure of the proportional valve in the opening state to be calibrated; therefore, the control overshoot can be prevented, namely the current gas pressure is smaller than the target gas pressure, the gas pressure is larger than the target gas pressure after once adjustment, and K is 0.8 multiplied by I0The current gas pressure can be made to slowly approach the target value, Kx (Q) to prevent excessive regulation1Maximum value of-Q)/10 is 10 XK, K exceeds 10 XK, and is adjusted to 10 XK.
Or, Kx (Q-Q)1) 10 is less than or equal to 10 multiplied by K, wherein K is a coefficient, Q is the current gas pressure, and Q is1The gas pressure of the proportional valve in the opening state to be calibrated is obtained. Therefore, the control overshoot can be prevented, namely the current gas pressure is larger than the target gas pressure, the gas pressure is smaller than the target gas pressure after once adjustment, and K is 0.8 multiplied by I0Can make the current gasThe air pressure slowly approaches the target value, K (Q) to prevent excessive adjustment1Maximum value of-Q)/10 is 10 XK, K exceeds 10 XK, and is adjusted to 10 XK.
The following description is made of the specific process applied to the calibration method provided in this embodiment:
three parameter specifications for gas water heaters require calibration:
PL- - -minimum opening degree of the proportional valve, when the barometer reaches a design value (corresponding to the minimum load of the gas water heater), the current output by the controller at the moment is recorded, and when the controller outputs the current during combustion operation, the output minimum load is represented.
DH-opening degree of the proportional valve when igniting, when the barometer reaches the design value (corresponding to the ignition load of the gas water heater), the current output by the controller at the moment is recorded. When the combustion is ignited, the controller outputs the current to indicate the output ignition load.
PH-the maximum opening degree of the proportional valve, and when the barometer reaches a design value (corresponding to the maximum load of the gas water heater), the current output by the controller at the moment is recorded. When the controller outputs the current during combustion operation, the controller outputs the maximum load.
Automatically adjusting calibration control:
1.1, after connecting each pipeline of the gas water heater, connecting a digital display barometer 2 to a pressure measuring part at the rear end of the proportional valve.
And 1.2, opening a water valve and an air valve. And controlling the gas water heater to automatically enter a normal combustion mode, and automatically entering PL calibration after the automatic debugging special controller 3 detects that the flame is normally combusted.
1.3, keeping PL preset current I _ PL for burning for 4S, ensuring the opening of the proportional valve to be stable during burning, and ensuring the output of the digital display barometer 2 to be relatively stable.
And sampling the current air pressure Q after 1.4 and 2.2 seconds. Description of air pressure sampling: because the controller of the gas water heater outputs current to control the proportional valve to have inertia, namely when the control current is increased or reduced, the proportional valve needs 3-5s to reflect the real opening. The air pressure fluctuates during the adjustment process, so that the air pressure sampling is not required to be too fast. In this embodiment, sampling is performed every 100ms, 11 groups of data are sampled every 1.1s, a median (sorting takes a median) Q1 is taken, and in the same way, 11 groups of numerical values are taken again to take a median Q2, and the current air pressure Q is obtained by participating in the calculation (Q1+ Q2)/2.
1.5, when Q < Q _ PL-10, the proportional valve current I _ PL automatically increases K (Q _ PL-Q)/10 (K is a current value I0 corresponding to 10PA under the normal condition, because the control overshoot is prevented, namely the current gas pressure is smaller than the target gas pressure, the current gas pressure is larger than the target gas pressure after once adjustment, K is 0.8 xI 0, the current gas pressure can slowly approach the target value, and Kx (Q) is used for preventing the excessive adjustment1Maximum value of-Q)/10 is 10 XK, K exceeds 10 XK, and is adjusted to 10 XK. After adjustment, a waiting time (Q _ PL-Q) S is carried out by the adjustment amount (i.e. the more the adjustment amount, the longer the waiting time), and then the step 1.4 is returned.
1.6 when Q>When Q _ PL +10, the current I _ PL of the proportional valve automatically increases K (Q-Q _ PL)/10(K is a current value I0 corresponding to 10PA under the normal condition, because the control overshoot is prevented, namely the current gas pressure is larger than the target gas pressure, the current gas pressure is smaller than the target gas pressure after once adjustment, K is 0.8 × I0, the current gas pressure can slowly approach the target value, and Kx (Q) is used for preventing the overshoot1Maximum value of-Q)/10 is 10 XK, K exceeds 10 XK, and is adjusted to 10 XK. After adjustment, a waiting time (Q-Q _ PL) S is carried out by the adjustment amount (i.e. the more the adjustment amount, the longer the waiting time), and the procedure returns to step 1.4
And 1.7, counting when Q _ PL +10 < Q < ═ Q _ PL-10, returning to the step 1.4, and entering the next DH calibration when the condition is met after three times of continuous counting. If 1.4 later enters again 1.5 or 1.6, a recount is required.
The DH calibration and PH calibration steps are the same as the PL calibration step. And after the calibration is finished, automatically storing the three calibration parameters to the controller. In order to prevent calibration errors, the three calibration parameters can be used as preset parameters, and PL, DH and PH can be re-calibrated for multiple times. After debugging, the automatic debugging special controller 3 controls the buzzer to sound to prompt that the operation is finished.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A calibration method for a proportional valve of a gas water heater is characterized by comprising the following steps:
controlling the gas water heater to enter a normal combustion mode;
judging whether the gas water heater enters a normal combustion mode or not, and controlling the proportional valve to adjust the opening degree to be calibrated if the gas water heater enters the normal combustion mode; the opening to be calibrated comprises a minimum opening of the proportional valve, an opening of the proportional valve during ignition and a maximum opening of the proportional valve;
controlling the proportional valve to work for a preset time under the opening degree to be calibrated;
sampling the current gas pressure of the gas water heater;
and judging whether the current gas pressure of the gas water heater meets a preset condition or not, and determining whether to adjust the proportional valve current or to sample the current gas pressure of the gas water heater again according to a judgment result.
2. The method for calibrating the proportional valve of the gas water heater according to claim 1, wherein the step of sampling the current gas pressure of the gas water heater specifically comprises:
sampling at least 2 groups of gas pressure data, taking the median of each group of gas pressure data, and taking the average value of all the medias as the current gas pressure of the gas water heater;
each group of gas pressure data comprises a plurality of gas pressure data obtained by sampling at intervals, and the plurality of gas pressure data are sequenced to obtain a median of the gas pressure data.
3. The method for calibrating the proportional valve of the gas water heater according to claim 1, wherein the step of determining whether to adjust the proportional valve current or to sample the current gas pressure of the gas water heater again according to the determination result specifically comprises the steps of:
if the current gas pressure of the gas water heater does not meet the preset condition, regulating the proportional valve current;
and if the current gas pressure of the gas water heater meets the preset condition, counting, and sampling the current gas pressure of the gas water heater again.
4. The method for calibrating the proportional valve of the gas water heater according to claim 3, wherein when the number of continuous counts reaches a preset number, the proportional valve is controlled to adjust to another opening to be calibrated, and the steps of controlling the proportional valve to work for a preset duration at the opening to be calibrated, sampling the current gas pressure of the gas water heater, and judging whether the current gas pressure of the gas water heater meets a preset condition are repeated.
5. The method for calibrating the proportional valve of the gas water heater according to claim 3, wherein the step of adjusting the proportional valve current comprises:
if the current gas pressure of the gas water heater is smaller than the preset gas pressure range of the preset condition, increasing the current of the proportional valve;
and if the current gas pressure of the gas water heater is larger than the preset gas pressure range of the preset condition, reducing the current of the proportional valve.
6. The method for calibrating the proportional valve of the gas water heater according to claim 5, wherein if the current gas pressure of the gas water heater is smaller than the preset gas pressure range of the preset condition, the step of increasing the current of the proportional valve comprises the steps of: k (Q1-Q)/10, wherein K is a coefficient, Q is the current gas pressure, and Q1 is the gas pressure of the proportional valve in the opening state to be calibrated;
after the proportional valve current is adjusted, waiting for time (Q1-Q) seconds, and sampling the current gas pressure of the gas water heater again.
7. The calibration method of the proportional valve of the gas water heater according to claim 5,
if the current gas pressure of the gas water heater is larger than the preset gas pressure range of the preset condition, the current for controlling the proportional valve to reduce in the step of reducing the current of the proportional valve is as follows: k (Q-Q1)/10, wherein K is a coefficient, Q is the current gas pressure, and Q1 is the gas pressure of the proportional valve in the opening state to be calibrated;
after adjusting the proportional valve current, waiting for a time (Q-Q1) second, and sampling the current gas pressure of the gas water heater again.
8. The method as claimed in claim 5 or 6, wherein K is 0.7 xI 0 ≤ K ≤ 0.9 xI 0, wherein I0 is the current value of the proportional valve under 10PA gas pressure.
9. The calibration method of the proportional valve of the gas water heater as claimed in claim 5 or 6, wherein Kx (Q1-Q)/10 ≤ 10 × K, wherein K is coefficient, Q is current gas pressure, and Q1 is gas pressure of the proportional valve at the opening to be calibrated;
or K (Q-Q1)/10 is less than or equal to 10 xK, wherein K is a coefficient, Q is the current gas pressure, and Q1 is the gas pressure of the proportional valve in the opening state to be calibrated.
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| CN106642711B (en) * | 2015-09-22 | 2022-09-16 | 艾欧史密斯(中国)热水器有限公司 | Dual sensing combustion system |
| CN105841353B (en) * | 2016-03-30 | 2019-02-12 | 成都前锋电子有限责任公司 | A kind of gas heater and its control method of width adaptation range |
| CN107101383B (en) * | 2017-05-13 | 2023-08-22 | 广东万家乐燃气具有限公司 | Gas heater production regulation check out test set |
| CN109237115B (en) * | 2017-07-10 | 2022-01-18 | 青岛经济技术开发区海尔热水器有限公司 | Adaptive adjustment method for working range of proportional valve and gas water heater |
| CN109724237B (en) * | 2017-10-30 | 2022-03-11 | 青岛经济技术开发区海尔热水器有限公司 | Secondary pressure adjusting method for gas water heater and gas water heater |
| CN110207392B (en) * | 2018-10-30 | 2021-07-23 | 华帝股份有限公司 | Method for correcting current function relationship between fan and proportional valve |
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