CN111380228B - Low-air-pressure identification control method of gas water heater - Google Patents
Low-air-pressure identification control method of gas water heater Download PDFInfo
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- CN111380228B CN111380228B CN202010144344.5A CN202010144344A CN111380228B CN 111380228 B CN111380228 B CN 111380228B CN 202010144344 A CN202010144344 A CN 202010144344A CN 111380228 B CN111380228 B CN 111380228B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000009835 boiling Methods 0.000 claims abstract description 8
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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 control method of a gas water heater, which comprises the following steps: detecting whether a user is boiling water; if the user is detected to be boiling, collecting a plurality of groups of demand load data; judging whether the user demand load is stable or not according to the multiple groups of demand load data; if the load required by the user is stable, judging whether the gas water heater shifts back and forth; and if the gas water heater shifts back and forth, judging that the actual air inlet pressure of the gas water heater is lower than the rated air inlet pressure, and adjusting the opening of the gas proportional valve. 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 control method of 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 low pressure identification control method for 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 control method of a gas water heater comprises the following steps:
detecting whether a user is boiling water;
if the user is detected to be boiling, collecting a plurality of groups of demand load data;
judging whether the user demand load is stable or not according to the multiple groups of demand load data;
if the load required by the user is stable, judging whether the gas water heater shifts back and forth;
and if the gas water heater shifts back and forth, judging that the actual air inlet pressure of the gas water heater is lower than the rated air inlet pressure, and adjusting the opening of the gas proportional valve.
In some embodiments, the step of collecting the multiple sets of demand load data specifically includes:
1 group of demand load data is collected at set time intervals in preset time, and n groups of demand load data are collected in the preset time.
In some embodiments, the demand load data 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.
In some embodiments, the step of determining whether the user demand load is stable according to the multiple sets of demand load data specifically includes:
when Q is1-Q2When the load is less than 0.3kw, the user demand load is judged to be stable, wherein Q1For the maximum of n sets of demand load data, Q2Is the minimum value in the n sets of demand load data.
In some embodiments, if the gas water heater is shifted back and forth, the step of determining that the actual intake pressure of the gas water heater is lower than the rated intake pressure specifically comprises:
when W is1PH＜W2When PL is required, the actual air inlet pressure of the gas water heater is judged to be lower than the rated air inlet pressure, wherein the gas water heater is W1Gear and W2Shift gears back and forth between gears, 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 heater2And the minimum load when the gas proportional valve is at the minimum opening degree in the gear.
In some embodiments, the step of adjusting the opening of the gas proportional valve is specifically:
adjusting the load of a gas water heater to W1PH, and sequentially increasing the current of the gas proportional valve;
comparing the outlet water temperature of the gas water heater with a target temperature set by a user;
and controlling the gas proportional valve to work according to the comparison result.
In some embodiments, the step of controlling the operation of the gas proportional valve according to the comparison result is specifically:
when the difference value between the outlet water temperature of the gas water heater and the target temperature set by a user is smaller than a preset threshold value, controlling the gas proportional valve to keep the current working state;
when the current of the gas proportional valve is adjusted up to the maximum current value, and the difference value between the water outlet temperature of the gas water heater and the target temperature set by the user is greater than a preset threshold value, calculating the user demand load and W1PH、W2And controlling the gas water heater to work according to the calculation result by the PL difference value.
In some embodiments, the user demand load and W are calculated1PH、W2The step of controlling the gas water heater to work according to the calculation result by the PL difference specifically 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 smaller, the load 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 smaller, the load of the gas water heater is adjusted to W2PL。
In some embodiments, W is adjusted after the gas water heater1The current of the gas proportional valve corresponding to the PH is stored as a preset current, and when the load of the gas water heater is adjusted to W again1And controlling the gas proportional valve to work at a preset current at the PH value.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. the low-air-pressure identification control method of 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 schematic sectional load diagram of a gas water heater in 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 low pressure identification control method for a gas water heater, where the identification control method includes the following steps:
detecting whether a user is boiling water;
if the user is detected to be boiling water, acquiring multiple groups of demand load data, specifically, acquiring 1 group of demand load data every set time within a preset time, acquiring n groups of demand load data within the preset time, for example, acquiring 1 group of demand load data value every 100ms, and acquiring 20 groups of demand load data a [0 ] within 2s]…a[19]Then sample every 100ms and a [19 ]]Value discard, i.e.: a 19]＝a[18]，a[18]＝a[17]，……，a[1]＝a[0]，a[0]The latest 20 sets of demand load data can be sampled from the current value, and further, the demand load data is calculated according to the following formula: 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 waterCalculating the water inlet temperature of the gas water heater by detecting the water inlet amount of the gas water heater and the water inlet temperature to obtain demand load data;
judging whether the user demand load is stable or not according to the multiple groups of demand load data, specifically, when Q is1-Q2When the load is less than 0.3kw, the user demand load is judged to be stable, wherein Q1For the maximum of n sets of demand load data, Q2The minimum value of the n groups of demand load data is that when a user bathes with water, the demand load of the general user is constant, and the demand load may fluctuate due to the inflow water temperature or unstable water flow of a small number of users;
if the load required by the user is stable, judging whether the gas water heater shifts back and forth, specifically, as shown in fig. 2, taking a 2-4-6 segmented gas water heater as an example, the rated intake pressure of the segmented gas water heater is 2000pa, when the actual intake pressure is too low, the PL load does not change, and the PH load obviously decreases, wherein PL is the minimum opening degree of the segmented gas proportional valve, namely the minimum load, PH is the maximum opening degree of the segmented gas proportional valve, namely the maximum load, the opening degrees of different segmented PL and PH gas proportional valves are consistent, and the combustion row number is controlled by an electromagnetic valve. Specifically, in this embodiment, if the gas water heater shifts gears back and forth, the step of determining that the actual intake pressure of the gas water heater is lower than the rated intake pressure specifically includes:
when W is1PH＜W2When PL is required, the actual air inlet pressure of the gas water heater is judged to be lower than the rated air inlet pressure, wherein the gas water heater is W1Gear and W2Shift gears back and forth between gears, 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 heater2Minimum load when gas proportional valve is at minimum opening degree in gear
More specifically, as shown in fig. 2, when 1 round-trip gear shifting occurs within 20s, such as 4PL- >2PH- >4PL, it is considered that the gear-off occurs in the gas water heater, as shown in fig. 2, when the load at 4PL is 6kw at a pressure close to the normal pressure, and the load at 2PH calculated by the water production capacity is less than 6kw, the load at 2PH at the normal pressure should be 7kw, and it is determined that the intake pressure of the gas water heater is low;
if the gas water heater is shifted back and forth, judging that the actual air inlet pressure of the gas water heater is lower than the rated air inlet pressure, and adjusting the opening of a gas proportional valve; in this embodiment, the step of adjusting the opening degree of the gas proportional valve specifically includes:
adjusting the load of a gas water heater to W1PH, and sequentially increasing the current of the gas proportional valve;
comparing the outlet water temperature of the gas water heater with a target temperature set by a user;
and controlling the gas proportional valve to work according to the comparison result.
Furthermore, the step of controlling the gas proportional valve to work according to the comparison result specifically comprises the following steps:
when the difference value between the outlet water temperature of the gas water heater and the target temperature set by a user is smaller than a preset threshold value, controlling the gas proportional valve to keep the current working state;
when the current of the gas proportional valve is adjusted up to the maximum current value, and the difference value between the water outlet temperature of the gas water heater and the target temperature set by the user is greater than a preset threshold value, calculating the user demand load and W1PH、W2And controlling the gas water heater to work according to the calculation result by the PL difference value.
Preferably, the user demand load and W are calculated1PH、W2The step of controlling the gas water heater to work according to the calculation result by the PL difference specifically 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 smaller, the load 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 smaller, the load of the gas water heater is adjusted to W2PL。
More preferably, W is adjusted after the gas water heater1The current of the gas proportional valve corresponding to the PH is stored as a preset current, and when the load of the gas water heater is adjusted to W again1And controlling the gas proportional valve to work at a preset current at the PH value.
Specifically, in this embodiment, the step of adjusting the opening degree of the gas proportional valve is specifically as shown in fig. 2:
(1) when the gear of the gas water heater is adjusted to be 2PH, the opening degree of the gas proportional valve is properly adjusted to finely adjust the load, the current of the common gas proportional valve can be adjusted to be 10mA at most, and after the current is generally adjusted to be more than 10mA, the opening degree of the gas proportional valve is basically unchanged, and the load cannot change.
A. And (3) increasing the current of the gas proportional valve by 0.5mA every time until the difference between the water outlet temperature of the gas water heater and the target temperature set by a user is within 2 ℃, and keeping the current of the gas proportional valve to work.
B. If the current of the gas proportional valve is increased to 10mA, the difference between the water outlet temperature of the gas water heater and the target temperature set by the user is more than 2 ℃, then which of the current 2PH and 4PL the user demand load is closer to is calculated, and if the user demand load is closer to 4PL, the gas water heater is switched to 4PL for heating.
(2) And storing the current value of the gas proportional valve corresponding to the increased 2PH, and controlling the gas proportional valve to work at the stored current value of the gas proportional valve when the gas water heater is adjusted to the 2PH load next time. And after power failure, the value is restored to factory default.
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 low air pressure identification control method of a gas water heater is characterized by comprising the following steps:
detecting whether a user is boiling water;
if the user is detected to be boiling, collecting a plurality of groups of demand load data;
judging whether the user demand load is stable or not according to the multiple groups of demand load data;
if the load required by the user is stable, judging whether the gas water heater shifts back and forth;
and if the gas water heater shifts back and forth, judging that the actual air inlet pressure of the gas water heater is lower than the rated air inlet pressure, and adjusting the opening of the gas proportional valve.
2. The low pressure identification control method of a gas water heater according to claim 1, wherein the step of collecting a plurality of sets of demand load data is specifically:
1 group of demand load data is collected at set time intervals in preset time, and n groups of demand load data are collected in the preset time.
3. The low pressure identification control method of the gas water heater according to claim 2, wherein the demand load data 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.
4. The low pressure identification control method of the gas water heater according to claim 2, wherein the step of judging whether the user demand load is stable according to the plurality of sets of demand load data specifically comprises:
when Q is1-Q2When the load is less than 0.3kw, the user demand load is judged to be stable, wherein Q1For the maximum of n sets of demand load data, Q2Is the minimum value in the n sets of demand load data.
5. The low pressure identification control method of the gas water heater according to claim 1, 2, 3 or 4, wherein if the gas water heater is shifted back and forth, the step of determining that the actual inlet pressure of the gas water heater is lower than the rated inlet pressure specifically comprises:
when W is1PH＜W2When PL is required, the actual air inlet pressure of the gas water heater is judged to be lower than the rated air inlet pressure, wherein the gas water heater is W1Gear and W2Shift gears back and forth between gears, 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 heater2And the minimum load when the gas proportional valve is at the minimum opening degree in the gear.
6. The low pressure identification control method of the gas water heater according to claim 5, wherein the step of adjusting the opening degree of the gas proportional valve specifically comprises:
adjusting the load of a gas water heater to W1PH, and sequentially increasing the current of the gas proportional valve;
comparing the outlet water temperature of the gas water heater with a target temperature set by a user;
and controlling the gas proportional valve to work according to the comparison result.
7. The low air pressure identification control method of the gas water heater according to claim 6, wherein the step of controlling the operation of the gas proportional valve according to the comparison result specifically comprises:
when the difference value between the outlet water temperature of the gas water heater and the target temperature set by a user is smaller than a preset threshold value, controlling the gas proportional valve to keep the current working state;
when the current of the gas proportional valve is adjusted up to the maximum current value, and the difference value between the water outlet temperature of the gas water heater and the target temperature set by the user is greater than a preset threshold value, calculating the user demand load and W1PH、W2And controlling the gas water heater to work according to the calculation result by the PL difference value.
8. The method as claimed in claim 7, wherein the calculation of the user demand load and the calculation of W are performed by a gas water heater1PH、W2The step of controlling the gas water heater to work according to the calculation result by the PL difference specifically 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 smaller, the load 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 smaller, the load of the gas water heater is adjusted to W2PL。
9. The low pressure identification control method of gas water heater according to claim 8, wherein W is adjusted after gas water heater1The current of the gas proportional valve corresponding to the PH is stored as a preset current, and when the load of the gas water heater is adjusted to W again1And controlling the gas proportional valve to work at a preset current at the PH value.
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| CN111981695A (en) * | 2020-07-22 | 2020-11-24 | 华帝股份有限公司 | Low-air-pressure identification and control method for gas water heater |
| CN112128988A (en) * | 2020-08-31 | 2020-12-25 | 华帝股份有限公司 | High-air-pressure identification control method for water heater and water heater |
| CN114294817A (en) * | 2021-12-03 | 2022-04-08 | 华帝股份有限公司 | Electric water heater and control method thereof |
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| JPS60223952A (en) * | 1984-11-13 | 1985-11-08 | Sanyo Electric Co Ltd | Gas water heater |
| RU2116582C1 (en) * | 1994-03-11 | 1998-07-27 | Юлий Владимирович Фундатор | Automatic gas-fired water heater |
| CN204512524U (en) * | 2014-12-23 | 2015-07-29 | 广东超人节能厨卫电器有限公司 | A kind of constant temp gas water heater valve body |
| CN110440449A (en) * | 2019-07-16 | 2019-11-12 | 华帝股份有限公司 | Control method of water heater system |
| CN110779216A (en) * | 2019-09-29 | 2020-02-11 | 华帝股份有限公司 | Gear control method of gas water heater |
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2020
- 2020-03-04 CN CN202010144344.5A patent/CN111380228B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60223952A (en) * | 1984-11-13 | 1985-11-08 | Sanyo Electric Co Ltd | Gas water heater |
| RU2116582C1 (en) * | 1994-03-11 | 1998-07-27 | Юлий Владимирович Фундатор | Automatic gas-fired water heater |
| CN204512524U (en) * | 2014-12-23 | 2015-07-29 | 广东超人节能厨卫电器有限公司 | A kind of constant temp gas water heater valve body |
| CN110440449A (en) * | 2019-07-16 | 2019-11-12 | 华帝股份有限公司 | Control method of water heater system |
| CN110779216A (en) * | 2019-09-29 | 2020-02-11 | 华帝股份有限公司 | Gear control method of gas water heater |
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