CN111981695A - Low-air-pressure identification and control method for gas water heater - Google Patents
Low-air-pressure identification and control method for gas water heater Download PDFInfo
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- CN111981695A CN111981695A CN202010712102.1A CN202010712102A CN111981695A CN 111981695 A CN111981695 A CN 111981695A CN 202010712102 A CN202010712102 A CN 202010712102A CN 111981695 A CN111981695 A CN 111981695A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000001276 controlling effect Effects 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 description 3
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- 230000009286 beneficial 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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Abstract
The invention discloses a low-pressure identification and control method for a gas water heater, which comprises the following steps: s1, controlling the gas water heater to burn normally; s2, calculating the demand load of the user; s3, judging whether the user demand load is W1PH or W2PL, if not, returns to step S2, if yes, proceeds to step S4, where W1Gear and W2The gears are 2 adjacent gears of the gas water heater, and W2The gear is higher than W1Gear position, W1PH is W of gas water heater1Maximum load at gear when gas proportional valve is at maximum opening, W2PL is W for gas water heater2The minimum load when the gas proportional valve is at the minimum opening degree in the gear; s4, calculating W1pH and W2PL, and W is judged2Whether PL is greater than W1The sum of the PH value and the preset threshold value, if not, the step is returned to the step S2, and if yes, the step is carried out to the step S5; s5, judging that the gas water heater is out of gear, and comparing W1PH and/or W2PL is regulated;the gear shifting device can avoid the situation of gear shifting back and forth so as to improve the use experience of a user.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to a low-pressure identification and control method for a gas water heater.
Background
The existing gas water heaters are all constant-temperature gas water heaters, the gas water heaters with different loads have different segmentation modes, such as 2-4-6 segmentation gas water heaters, which means that 2 rows (4 rows or 6 rows) of fire can be used for heating and burning when the gas water heaters burn, and different rows of fire are selected for burning according to different loads, but when the gas water heaters leave a factory, 2 rows of maximum fire loads are required to be greater than 4 rows of minimum fire loads, and 4 rows of maximum fire loads are required to be greater than 6 rows of minimum fire loads, so as to ensure the continuity of the loads. However, due to the influence of the use environment of the user, for example, the influence of conditions such as low gas intake pressure, etc., the maximum fire load of 2 rows is smaller than the minimum fire load of 4 rows, and when the user demand load is between the maximum fire load of 2 rows and the minimum fire load of 4 rows, the gas water heater cannot meet the user demand load, thereby reducing the use experience of the user.
Disclosure of Invention
The present invention is directed to solve at least one of the problems of the related art to a certain extent, and therefore, the present invention is to provide a method for identifying and controlling low pressure of a gas water heater, which can avoid the situation of shifting gears back and forth to improve the user experience.
The above purpose is realized by the following technical scheme:
a low air pressure identification and control method for a gas water heater comprises the following steps:
s1, controlling the gas water heater to burn normally;
s2, calculating the demand load of the user;
s3, judging whether the user demand load is W1PH or W2PL, if not, returns to step S2, if yes, proceeds to step S4, where W1Gear and W2The gears are 2 adjacent gears of the gas water heater, and W2The gear is higher than W1Gear position, W1PH is W of gas water heater1Maximum load at gear when gas proportional valve is at maximum opening, W2PL is W for gas water heater2The minimum load when the gas proportional valve is at the minimum opening degree in the gear;
s4, calculating W1pH and W2PL, and W is judged2Whether PL is greater than W1The sum of the PH value and the preset threshold value, if not, the step is returned to the step S2, and if yes, the step is carried out to the step S5;
S5，judging the occurrence of gear-off of the gas water heater and comparing W1PH and/or W2PL is regulated.
In some embodiments, step S2 is followed by the steps of:
and S21, judging whether the user demand load is stable, if so, entering the step S3, otherwise, returning to the step S2.
In some embodiments, step S21 includes:
s211, judging whether the preset temperature of a user, the water inlet temperature and/or the water flow of the gas water heater are/is changed, if not, repeating the step S211, and if so, entering the step S212;
s212, calculating the real-time demand load of the gas water heater, judging whether the difference value between the real-time demand load and the user demand load is smaller than a preset difference value, if so, judging that the user demand load is stable, and if not, judging that the user demand load is unstable.
In some embodiments, step S5 includes:
s51, adjusting the gas water heater to W1PH；
S52, increasing the current of the gas proportional valve by a first current value;
s53, judging whether the sum of the cumulatively increased first current values is larger than a first maximum current value or not, if so, switching the gas water heater to W2PL, if not, then go to step S54;
s54, judging W1Whether PH is greater than W2PL, if yes, proceeds to step S55, otherwise, returns to step S52;
and S55, stopping increasing the current of the gas proportional valve, and controlling the gas water heater to burn normally.
In some embodiments, switching the gas water heater to W2The PL step is followed by:
s531, reducing the current of the gas proportional valve by a second current value;
s532, judging whether the sum of the cumulatively reduced second current values is larger than a second maximum current value or not, and if so, calculating the user demand load and W1PH、W2Difference of PL and according to calculationControlling the gas water heater to work as a result, and if not, entering the step S533;
s533, judging W1Whether PH is greater than W2PL, if yes, the process goes to step S534, otherwise, the process returns to step S531;
and S534, stopping increasing the current of the gas proportional valve, and controlling the gas water heater to burn normally.
In some embodiments, the user demand load and W are calculated1PH、W2The step of controlling the gas water heater to work according to the difference value of the PLs and the calculation result comprises the following steps:
calculating the user demand load and W1Difference of PH, calculating user demand load and W2The difference in PL;
when the user demand load is W1The difference of PH is less than the user demand load and W2When the difference value of PL is small, the gear of the gas water heater is adjusted to W1PH；
When the user demand load is W1The difference of PH is larger than the user demand load and W2When the difference value of PL is small, the gear of the gas water heater is adjusted to W2PL
In some embodiments, the predetermined threshold is 0.2-0.8 kw.
In some embodiments, the user demand load is calculated according to the following formula:
P＝L×(Tis provided with-TInflow water) /14, wherein L is the water inflow of the gas water heater, TIs provided withTarget temperature, T, set for userInflow waterThe temperature of the inlet water of the gas water heater.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. the low-air-pressure identification and control method for the gas water heater can avoid the situation of back-and-forth gear shifting so as to improve the use experience of users.
Drawings
FIG. 1 is a schematic flow chart illustrating a low pressure identification control method according to an embodiment of the present invention;
FIG. 2 is a sectional load diagram of a 2-4-6 sectional gas water heater in an embodiment of the invention;
FIG. 3 is a control flow chart of a 2-4-6 sectional gas water heater in the embodiment of the 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, the present embodiment provides a method for identifying and controlling low pressure of a gas water heater, the method includes the following steps:
s1, controlling the gas water heater to burn normally;
s2, calculating the user demand load, specifically, the user demand load P ═ L × (T)Is provided with-TInflow water) /14, wherein L is the water inflow of the gas water heater, TIs provided withTarget temperature, T, set for userInflow waterThe water inlet temperature of the gas water heater;
s3, judging whether the user demand load is W1PH or W2PL, if not, returns to step S2, if yes, proceeds to step S4, where W1Gear and W2The gears are 2 adjacent gears of the gas water heater, and W2The gear is higher than W1Gear position, W1PH is W of gas water heater1Maximum load at gear when gas proportional valve is at maximum opening, W2PL is W for gas water heater2The minimum load when the gas proportional valve is at the minimum opening degree in the gear;
s4, calculating W1pH and W2PL, and W is judged2Whether PL is greater than W1If not, returning to step S2, and if yes, entering step S5, in this embodiment, the preset threshold is 0.2-0.8kw, preferably, the preset threshold is 0.5kw, that is, determining W2Whether PL is greater than W1PH+0.5kw；
S5, judging that the gas water heater is out of gear, and comparing W1PH value and/or W2PL is regulated.
The low-pressure identification and control method for the gas water heater can avoid the situation of back-and-forth gear shifting, so that the use experience of a user is improved.
In the present embodiment, step S2 is followed by the following steps:
and S21, judging whether the user demand load is stable, if so, entering the step S3, otherwise, returning to the step S2.
Further, step S21 includes:
s211, judging whether the preset temperature of a user, the water inlet temperature and/or the water flow of the gas water heater are/is changed, if not, repeating the step S211, and if so, entering the step S212;
s212, calculating the real-time demand load of the gas water heater, judging whether the difference value between the real-time demand load and the user demand load is smaller than a preset difference value, if so, judging that the user demand load is stable, and if not, judging that the user demand load is unstable. The steps are reasonable in design, and the situation that whether the gas water heater is out of gear or not can not be accurately judged due to the fact that the load required by a user changes can be avoided.
In the present embodiment, step S5 includes:
s51, adjusting the gas water heater to W1PH；
S52, increasing the current of the gas proportional valve by a first current value;
s53, judging whether the sum of the cumulatively increased first current values is larger than a first maximum current value or not, if so, switching the gas water heater to W2PL, if not, then go to step S54;
s54, judging W1Whether PH is greater than W2PL, if yes, proceeds to step S55, otherwise, returns to step S52;
and S55, stopping increasing the current of the gas proportional valve, and controlling the gas water heater to burn normally.
Further, the gas water heater is switched to W2The PL step is followed by:
s531, reducing the current of the gas proportional valve by a second current value;
s532, judging whether the sum of the cumulatively reduced second current values is larger than a second maximum current value or not, and if so, calculating the user demand load and W1PH、W2The PL difference value controls the gas water heater to work according to the calculation result, if not, the step S533 is carried out;
s533, judging W1Whether PH is greater than W2PL, if yes, the process goes to step S534, otherwise, the process returns to step S531;
and S534, stopping increasing the current of the gas proportional valve, and controlling the gas water heater to burn normally.
In this embodiment, the user demand load and W are calculated1PH、W2The step of controlling the gas water heater to work according to the difference value of the PLs and the calculation result comprises the following steps:
calculating the user demand load and W1Difference of PH, calculating user demand load and W2The difference in PL;
when the user demand load is W1The difference of PH is less than the user demand load and W2When the difference value of PL is small, the gear of the gas water heater is adjusted to W1PH；
When the user demand load is W1The difference of PH is larger than the user demand load and W2When the difference value of PL is small, the gear of the gas water heater is adjusted to W2PL。
As shown in fig. 2 and fig. 3, as exemplified by a 2-4-6 staged gas water heater, the rated intake pressure is 2000pa, when the actual intake pressure is too low, the PL load is not changed, and the PH load is obviously reduced, wherein PL is the minimum opening of the staged gas proportional valve, i.e. the minimum load, PH is the maximum opening of the staged gas proportional valve, i.e. the maximum load, and the openings of the different staged PL and PH gas proportional valves are consistent, and the combustion discharge number is controlled by an electromagnetic valve.
The low air pressure identification method comprises the following steps:
the phenomenon of low air pressure: when the user demand load P is L (T)Is provided with-TInflow water) /14, wherein L is the water inflow of the gas water heater, TIs provided withTarget temperature, T, set for userInflow waterFor the inlet water temperature of gas water heatersP is constant, when a user bathes with water, the general demand load is constant, when the set temperature and water flow are not changed, for example, when the demand load is 5.5kw, and the gear is broken due to low air pressure, namely, the condition that 4PL is less than 2PH occurs, the load can be satisfied without corresponding fire grate, and when the water heater is not processed, the water heater can be shifted back and forth, for example, 4PL->2PH->4PL->2PH。
The identification method comprises the following steps: when the gas water heater is at 4PL or 2PH, the water producing capacity P ═ L × (T) is respectively carried outIs provided with-TInflow water) 14 calculation when 4PL is found>When the pH value is 2 and 0.5kw, the gas water heater is considered to be out of gear, and the gas pressure is too low;
exit recognition conditions: when the user preset temperature, the inlet water temperature and/or the water flow change of the gas water heater are found in the identification process, the user demand load P is L (T)Is provided with-TInflow water) And when the/14 change is larger than 0.5kw, the identification judgment is carried out again.
Recognizing low air pressure control:
1. when the gear of the gas water heater is adjusted to be 2PH, the opening of the proportional valve is properly increased to finely adjust the load, and the maximum value of the load can be adjusted to be 10 mA. Generally, after the up-regulation is larger than 10mA, the opening of the proportional valve is basically unchanged, and the load can not be changed any more.
The current of the 0.5mA proportional valve is adjusted up each time until the water production capacity P is equal to L x (T) at 2PHIs provided with-TInflow water) When the/14 is larger than 4PL, the current is stopped increasing, and the gear is not stopped at the moment, so that the constant temperature can be normally controlled.
2. If the proportional valve is increased by 10mA, the water producing capacity P of 2PH is not full (T)Is provided with-TInflow water) When the/14 is larger than 4PL, the gear of the gas water heater is switched to 4PL, the proportional valve current of 0.5mA is adjusted downwards each time, the maximum value can be adjusted downwards by 5mA until 2PH is met>4PL stopped downregulation.
If the flame is extinguished midway, the flame is reignited, the 4PL proportional valve current +0.5mA before the flame is extinguished is used for ensuring that the flame is not extinguished, and the required load is judged to be away from the current load P to be L (T)Is provided with-TInflow water) And/14 is closer to 2PH, 4PL, and then switched to the closer load value for heating.
3. If the maximum downward adjustment amount is 5mA, 2PH <4PL is not met, and the gear of the gas water heater is switched to the close load value for heating.
4. The adjusted current values of 2PH and 4PL are memorized, and the current values are reused for the next time, namely the compensated values are used, so that the gear is not broken any more, and the current values do not need to be adjusted and determined for many times.
The control method provided by the embodiment at least has the following advantages:
1. when the air pressure is not too low, the current constant temperature requirement can be met through compensation when the air pressure is operated at 2PH or 4PL, and the segmented back-and-forth switching can not occur;
when the gear is broken seriously, a proper gear can be selected after one-time switching.
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 (8)
1. A low air pressure identification and control method for a gas water heater is characterized by comprising the following steps:
s1, controlling the gas water heater to burn normally;
s2, calculating the demand load of the user;
s3, judging whether the user demand load is W1PH or W2PL, if not, returns to step S2, if yes, proceeds to step S4, where W1Gear and W2The gears are 2 adjacent gears of the gas water heater, and W2The gear is higher than W1Gear position, W1PH is W of gas water heater1Maximum load at gear when gas proportional valve is at maximum opening, W2PL is W for gas water heater2The minimum load when the gas proportional valve is at the minimum opening degree in the gear;
s4, calculating W1pH and W2PL, and W is judged2Whether PL is greater than W1The sum of the PH value and the preset threshold value, if not, the step is returned to the step S2, and if yes, the step is carried out to the step S5;
s5, judging that the gas water heater is out of gear, and comparing W1PH and/or W2PL is regulated.
2. The method for identifying and controlling low pressure of a gas water heater as claimed in claim 1, wherein the step S2 is followed by the steps of:
and S21, judging whether the user demand load is stable, if so, entering the step S3, otherwise, returning to the step S2.
3. The method for identifying and controlling low pressure of a gas water heater as claimed in claim 2, wherein the step S21 comprises:
s211, judging whether the preset temperature of a user, the water inlet temperature and/or the water flow of the gas water heater are/is changed, if not, repeating the step S211, and if so, entering the step S212;
s212, calculating the real-time demand load of the gas water heater, judging whether the difference value between the real-time demand load and the user demand load is smaller than a preset difference value, if so, judging that the user demand load is stable, and if not, judging that the user demand load is unstable.
4. The method for identifying and controlling low pressure of a gas water heater as claimed in claim 1, wherein the step S5 comprises:
s51, adjusting the gas water heater to W1PH；
S52, increasing the current of the gas proportional valve by a first current value;
s53, judging whether the sum of the cumulatively increased first current values is larger than a first maximum current value or not, if so, switching the gas water heater to W2PL, if not, then go to step S54;
s54, judging W1Whether PH is greater than W2PL, if yes, proceeds to step S55, otherwise, returns to step S52;
and S55, stopping increasing the current of the gas proportional valve, and controlling the gas water heater to burn normally.
5. The method as claimed in claim 4, wherein the gas water heater is switched to W2The PL step is followed by:
s531, reducing the current of the gas proportional valve by a second current value;
s532, judging whether the sum of the cumulatively reduced second current values is larger than a second maximum current value or not, and if so, calculating the user demand load and W1PH、W2The PL difference value controls the gas water heater to work according to the calculation result, if not, the step S533 is carried out;
s533, judging W1Whether PH is greater than W2PL, if yes, the process goes to step S534, otherwise, the process returns to step S531;
and S534, stopping increasing the current of the gas proportional valve, and controlling the gas water heater to burn normally.
6. The method as claimed in claim 5, wherein the user demand load and W are calculated1PH、W2The step of controlling the gas water heater to work according to the difference value of the PLs and the calculation result comprises the following steps:
calculating the user demand load and W1Difference of PH, calculating user demand load and W2The difference in PL;
when the user demand load is W1The difference of PH is less than the user demand load and W2When the difference value of PL is small, the gear of the gas water heater is adjusted to W1PH；
When the user demand load is W1The difference of PH is larger than the user demand load and W2When the difference value of PL is small, the gear of the gas water heater is adjusted to W2PL。
7. The method for identifying and controlling low pressure in a gas water heater as claimed in any one of claims 1 to 6, wherein the predetermined threshold is 0.2-0.8 kw.
8. The method for identifying and controlling low pressure of a gas water heater as claimed in any one of claims 1 to 6, wherein the user demand load is calculated according to the following formula:
P＝L×(Tis provided with-TInflow water) /14, wherein L is the water inflow of the gas water heater, TIs provided withTarget temperature, T, set for userInflow waterThe temperature of the inlet water of the gas water heater.
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| CN115289691A (en) * | 2022-08-04 | 2022-11-04 | 珠海格力电器股份有限公司 | Combustion control method and device for gas water heater, gas water heater and storage medium |
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