CN111426066B - Temperature control method for gas water heater - Google Patents
Temperature control method for gas water heater Download PDFInfo
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- CN111426066B CN111426066B CN202010306938.1A CN202010306938A CN111426066B CN 111426066 B CN111426066 B CN 111426066B CN 202010306938 A CN202010306938 A CN 202010306938A CN 111426066 B CN111426066 B CN 111426066B
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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 relates to a temperature control method of a gas water heater, which is characterized by comprising the following steps: acquiring water flow data entering a gas water heater in real time, acquiring fluctuation frequency M of water flow in unit cycle time, if M is more than or equal to M0, reducing the maximum working current I of a proportional valve to aI0, and simultaneously controlling the current of the proportional valve and the rotating speed of a fan to adjust in real time according to the water flow data; wherein M0 is the high water flow fluctuation frequency threshold, a is a positive number, a is more than 0 and less than 1, and I0 is the standard maximum working current of the proportional valve. According to the temperature control method of the gas water heater, under the condition that the water flow fluctuation frequency is high, the maximum working power of the gas water heater can be limited by reducing the maximum working current of the proportional valve, namely the adjustment range of the proportional valve is limited, the outlet water temperature is correspondingly limited, and the condition that a user is scalded is avoided. Meanwhile, the variation range of the outlet water temperature is limited, and the stability of the outlet water temperature is improved.
Description
Technical Field
The invention relates to the technical field of gas water heaters, in particular to a temperature control method of a gas water heater.
Background
The proportional valve in the gas water heater generally comprises two gas double channels with different opening diameters, an electromagnetic valve arranged corresponding to each channel to control the conduction and the closing of the channel, an air outlet communicated with the gas double channels, and an opening degree adjusting assembly for adjusting the opening degree of the air outlet. When the gas water heater works, when the combustion load is small, the electromagnetic valve is controlled to act so as to open the channel with the small outlet, when the combustion load is increased, the electromagnetic valve is controlled to act so as to open the channel with the large outlet, and when the gas water heater burns at full load, the electromagnetic valve is controlled to act so as to simultaneously open the two channels, namely, the adjustment of different load sections of the gas water heater can be realized through controlling the electromagnetic valves on the two channels. On the basis that the electromagnetic valve controls the conduction and the closing of the two channels, the opening adjusting assembly is used for adjusting the area of the flow opening of the channel, and then the opening and closing state of the two channels and the size of the area of the flow opening jointly form the opening of the proportional valve. And the rotational speed of the fan is synchronously adjusted along with the opening of the proportional valve, namely the larger the opening of the proportional valve is, the larger the rotational speed of the corresponding fan is.
The stability of the outlet water temperature is an important judgment standard of the working performance of the gas water heater, and the water flow of a user house usually has fluctuation in the working process of the gas water heater, so that the stability of the outlet water of the gas water heater is directly influenced. The patent of the utility model discloses a chinese utility model patent "become row formula gas instantaneous water heater" of granted publication number CN2766189Y (application number 200420054512.8), the gas water heater that wherein discloses has water flow sensor feedback signal to singlechip to adjust gas flow when water pressure fluctuates. However, under the condition that the water flow fluctuates rapidly, the proportional valve opening adjusting frequency cannot be well adjusted according to the fluctuation frequency of the water flow, the condition that the water cannot be adjusted or the instantaneous temperature is too high can occur, the stability of the outlet water temperature is difficult to guarantee, and meanwhile, the proportional valve can be damaged.
Disclosure of Invention
The invention aims to solve the technical problem of providing a temperature control method of a gas water heater, which can realize stable outlet water temperature and avoid overhigh outlet water temperature under the condition of higher water flow fluctuation frequency in the prior art.
The technical scheme adopted by the invention for solving the problems is as follows: a temperature control method for a gas water heater is characterized by comprising the following steps: acquiring water flow data entering a gas water heater in real time, acquiring fluctuation frequency M of water flow in unit cycle time, if M is more than or equal to M0, reducing the maximum working current I of a proportional valve to aI0, and simultaneously controlling the current of the proportional valve and the rotating speed of a fan to adjust in real time according to the water flow data;
wherein M0 is the high water flow fluctuation frequency threshold, a is a positive number, a is more than 0 and less than 1, and I0 is the standard maximum working current of the proportional valve.
In order to ensure the constant temperature of the discharged water when the adjusting frequency of the proportional valve cannot be adjusted along with the water flow fluctuation frequency, comparing M with a water flow fluctuation frequency threshold value M1 which cannot be followed by the proportional valve, if M is more than or equal to M1, calculating the average value A of water flow data by using a filtering algorithm, and controlling the current of the proportional valve and the rotating speed of a fan according to A; wherein M1 > M0.
In order to reduce the load section switching work of the gas water heater and improve the stability of the water outlet temperature of the water heater, if M0 < M1 and the gas water heater needs to be switched between two adjacent load sections due to the fluctuation of water flow:
controlling the gas water heater to work in any one of the two adjacent load sections;
or counting the number B of switching load sections of the gas water heater, and controlling the gas water heater to stop switching between the two adjacent load sections when B reaches a switching number threshold value B0.
Preferably, B0 ═ 3.
Preferably, the fluctuation frequency of the water flow in the unit period time is obtained according to a water flow data inflection point, where the water flow data inflection point is: the water flow data collected at the data collection time before the inflection point of the water flow data and the water flow data collected at the data collection time after the inflection point of the water flow data are both larger than the water flow data collected at the inflection point of the water flow data; or the water flow data acquired at the data acquisition time before the inflection point of the water flow data and the water flow data acquired at the data acquisition time after the inflection point of the water flow data are both smaller than the water flow data acquired at the inflection point of the water flow data.
Compared with the prior art, the invention has the advantages that: according to the temperature control method of the gas water heater, under the condition that the water flow fluctuation frequency is high, the maximum working power of the gas water heater can be limited by reducing the maximum working current of the proportional valve, namely the adjustment range of the proportional valve is limited, the outlet water temperature is correspondingly limited, the condition that the outlet water temperature is too high when the proportional valve cannot be well adjusted along with the water flow fluctuation is avoided, namely the condition that the outlet water temperature is too high due to the fact that the adjustment action of the proportional valve lags behind the water flow fluctuation is avoided, and the condition that a user is scalded is further avoided. Meanwhile, the variation range of the outlet water temperature is limited, and the stability of the outlet water temperature is improved. The method is suitable for the condition that the adjustment of the proportional valve cannot well follow the frequency of water flow fluctuation due to high water flow fluctuation frequency, and the constant temperature adjustment problem under the condition of high-frequency water flow fluctuation is solved.
Drawings
FIG. 1 is a flow chart of a method for controlling the temperature of a gas water heater according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1, the method for controlling the temperature of a gas water heater in the present embodiment includes the following steps:
s1, acquiring water flow data entering the gas water heater in real time, and acquiring the fluctuation frequency M of the water flow in unit cycle time, wherein the duration of the unit cycle time is specifically set according to the requirement;
the fluctuation frequency of the water flow in unit cycle time can be obtained according to the inflection point of the water flow data, and the inflection point of the water flow data is as follows: the water flow data collected at the data collection time before the inflection point of the water flow data and the water flow data collected at the data collection time after the inflection point of the water flow data are both larger than the water flow data collected at the inflection point of the water flow data; or the water flow data acquired at the data acquisition time before the inflection point of the water flow data and the water flow data acquired at the data acquisition time after the inflection point of the water flow data are both smaller than the water flow data acquired at the inflection point of the water flow data;
s2, comparing M with a high water flow fluctuation frequency threshold M0;
if M is larger than or equal to M0, reducing the maximum working current I of the proportional valve to be aI0, wherein a is a positive number, a is larger than 0 and smaller than 1, and I0 is the standard maximum working current of the proportional valve; meanwhile, the current of the proportional valve and the rotating speed of the fan are controlled to be adjusted in real time along with the water flow data, namely the speed is controlled in real time according to the working control method of the gas water heater according to the water flow data and the set outlet water temperature value of a user, and the current of the proportional valve and the rotating speed of the fan can not be increased after the current of the proportional valve reaches the maximum working current I;
so under the condition that the water flow fluctuation frequency is high, can limit gas heater's maximum operating power through the maximum operating current who reduces the proportional valve, the control range of proportional valve has been restricted promptly, the corresponding leaving water temperature that has restricted, the too high condition of leaving water temperature of avoiding appearing when following the water flow fluctuation regulation because of the proportional valve can not be fine, the too high condition of leaving water temperature that leads to because of the regulating action lag water flow fluctuation of proportional valve promptly is avoided, and then avoid producing the condition of scalding to the user. Meanwhile, the variation range of the outlet water temperature is limited, the influence of high-frequency water flow fluctuation on the outlet water temperature is reduced, and the stability of the outlet water temperature is improved.
S3, if M is more than M0 and the gas water heater needs to switch between two adjacent load sections due to the fluctuation of water flow on the basis of S2, on the basis of reducing the maximum working current I of the proportional valve to aI0, the gas water heater works in one of the following two modes;
1) the gas water heater is controlled to work in any one of the two adjacent load sections, in the embodiment, the gas water heater is controlled to work in the lower load section of the two adjacent load sections, and the adjustment of the rotating speed of the proportional valve and the fan is carried out in the lower load section according to water flow data and a set water outlet temperature value
2) Counting the number of times B of switching load sections of the gas water heater, and when B reaches a switching time threshold value B0, in the embodiment, B0 is 3, controlling the gas water heater to stop switching between the two adjacent load sections, namely, stopping working in the current load section after 3 times of load section switching;
therefore, frequent switching of the electromagnetic valve in the proportional valve can be avoided, and the stability of the outlet water temperature is improved on the basis of improving the working stability of the gas water heater;
s4, on the basis of S2 and S3, comparing M with a water flow fluctuation frequency threshold value M1 which cannot be followed by the proportional valve, and if M is larger than or equal to M1, calculating an average value A of water flow data by using a filtering algorithm, wherein the adopted filtering algorithm can adopt various filtering algorithms in the prior art, for example, an average filtering algorithm can be adopted, and on the basis of reducing the maximum working current I of the proportional valve to aI0, the current of the proportional valve and the rotating speed of the fan are adjusted according to A; meanwhile, if the situation that the gas water heater needs to be switched between two adjacent load sections due to the water flow rate occurs, the gas water heater works according to the method in S3;
therefore, when the adjusting frequency of the proportional valve can not be adjusted along with the water flow fluctuation frequency, the stability of the water flow data for controlling the adjustment of the proportional valve is improved through filtering calculation, and the constant temperature of the outlet water is further ensured,
according to the temperature control method of the gas water heater, the progressive adjustment is adopted according to the change of the water flow fluctuation frequency, the influence of high-frequency water flow fluctuation on the outlet water temperature is reduced, the adjustment response of the proportional valve is fast, the frequency range of the water flow fluctuation can be responded, and the stability of the outlet water temperature is greatly improved.
Claims (4)
1. A temperature control method for a gas water heater is characterized by comprising the following steps: acquiring water flow data entering a gas water heater in real time, acquiring fluctuation frequency M of water flow in unit cycle time, if M is more than or equal to M0, reducing the maximum working current I = aI0 of a proportional valve, and simultaneously controlling the current of the proportional valve and the rotating speed of a fan to adjust in real time according to the water flow data;
wherein M0 is a high water flow fluctuation frequency threshold, a is a positive number, a is more than 0 and less than 1, and I0 is the standard maximum working current of the proportional valve;
if M > M0, and the gas water heater needs to switch between two adjacent load segments due to water flow fluctuations:
controlling the gas water heater to work in any one of the two adjacent load sections;
or counting the number B of switching load sections of the gas water heater, and controlling the gas water heater to stop switching between the two adjacent load sections when B reaches a switching number threshold value B0.
2. The gas water heater temperature control method according to claim 1, characterized in that: comparing M with a water flow fluctuation frequency threshold M1 which cannot be followed by the proportional valve, if M is larger than or equal to M1, calculating an average value A of water flow data by using a filtering algorithm, and controlling the current of the proportional valve and the rotating speed of the fan according to A; wherein M1 > M0.
3. The gas water heater temperature control method according to claim 1 or 2, characterized in that: b0= 3.
4. The gas water heater temperature control method according to claim 1, characterized in that: acquiring the fluctuation frequency of the water flow in unit cycle time according to water flow data inflection points, wherein the water flow data inflection points are as follows: the water flow data collected at the data collection time before the inflection point of the water flow data and the water flow data collected at the data collection time after the inflection point of the water flow data are both larger than the water flow data collected at the inflection point of the water flow data; or the water flow data acquired at the data acquisition time before the inflection point of the water flow data and the water flow data acquired at the data acquisition time after the inflection point of the water flow data are both smaller than the water flow data acquired at the inflection point of the water flow data.
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| CN202010306938.1A CN111426066B (en) | 2020-04-17 | 2020-04-17 | Temperature control method for gas water heater |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112050475A (en) * | 2020-09-07 | 2020-12-08 | 芜湖美的厨卫电器制造有限公司 | Water temperature control method, device and equipment of water heater and gas water heater |
| CN112050476B (en) * | 2020-09-07 | 2022-07-29 | 芜湖美的厨卫电器制造有限公司 | Temperature control method, device and equipment of water heater and water heater |
| CN112066567B (en) * | 2020-10-09 | 2021-06-04 | 宁波方太厨具有限公司 | Constant temperature control method and system for gas water heater, electronic equipment and storage medium |
| CN112682947A (en) * | 2020-12-28 | 2021-04-20 | 威能(无锡)供热设备有限公司 | Gas water heating equipment and disturbance compensation control method and readable storage medium thereof |
| CN114234453B (en) * | 2021-09-26 | 2023-03-07 | 华帝股份有限公司 | Fluctuating temperature control method of gas water heater and gas water heater |
| CN115111784A (en) * | 2022-06-24 | 2022-09-27 | 宁波方太厨具有限公司 | Temperature control method and device for water heater, water heater and storage medium |
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| CN101303161A (en) * | 2008-06-12 | 2008-11-12 | 中山华帝燃具股份有限公司 | Intelligent gas water heater and control method thereof |
| JP2017067348A (en) * | 2015-09-29 | 2017-04-06 | 株式会社ガスター | Hot water supply system and abnormality determination method of hot water supply system |
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