CN110953728A - Constant temperature control method of gas water heater - Google Patents
Constant temperature control method of gas water heater Download PDFInfo
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- CN110953728A CN110953728A CN201911296342.1A CN201911296342A CN110953728A CN 110953728 A CN110953728 A CN 110953728A CN 201911296342 A CN201911296342 A CN 201911296342A CN 110953728 A CN110953728 A CN 110953728A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 297
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 7
- 230000011218 segmentation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling 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
Abstract
The invention discloses a constant temperature control method of a gas water heater, which comprises the following steps: starting the gas water heater; collecting a plurality of groups of water flow data; judging whether the current water flow has circular fluctuation or not according to the collected water flow data; if the current water flow has cyclic fluctuation, calculating the average value of a plurality of groups of water flow data to obtain the current demand load; controlling the gas water heater to perform heating work according to the calculated current demand load; collecting multiple groups of water flow data again; and judging whether the current water flow is stable or not according to the collected water flow data. The method is simple and reliable, and the gas water heater can ensure that the outlet water temperature is relatively constant when the water flow is in cyclic fluctuation.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a constant temperature control method of a gas water heater.
Background
In the prior art, most of gas water heaters are constant-temperature gas water heaters, and 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 of fire (4 rows of fire or 6 rows of fire) can be used for heating and burning when the gas water heaters burn, different rows of fire numbers 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, 4 rows of maximum fire loads are required to be greater than 6 rows of minimum fire loads, and load continuity is ensured. However, due to the influence of the use environment of a user (when the water pressure is unstable, the water flow fluctuation is large), the demand load of the water flow at a high point is more than 2 rows of the maximum fire for a moment, the water flow needs to be switched to 4 rows of the maximum fire, and when the water flow at a low point, the demand load is less than 4 rows of the minimum fire, the water flow needs to be switched to 2 rows of the minimum fire, so that the gas water heater is shifted back and forth, the flame is unstable, and the outlet water temperature is suddenly low.
Disclosure of Invention
The invention aims to solve at least one of the problems in the prior related art to a certain extent, and therefore, the invention provides a constant temperature control method of a gas water heater, which is simple and reliable and can ensure that the outlet water temperature is relatively constant when the water flow of the gas water heater generates cyclic fluctuation.
The above purpose is realized by the following technical scheme:
a thermostatic control method of a gas water heater comprises the following steps:
starting the gas water heater;
collecting a plurality of groups of water flow data;
judging whether the current water flow has circular fluctuation or not according to the collected water flow data;
if the current water flow has cyclic fluctuation, calculating the average value of the multiple groups of water flow data to obtain the current demand load;
controlling the gas water heater to perform heating work according to the calculated current demand load;
collecting multiple groups of water flow data again;
and judging whether the current water flow is stable or not according to the collected water flow data.
In some embodiments, the step of collecting multiple sets of water flow data specifically comprises:
collecting the plurality of water flow data values at intervals of second preset time within first preset time to obtain first water flow data;
and continuously acquiring the current water flow data value every second preset time interval, correcting the water flow data acquired last time according to the acquired current water flow data value, and correcting the water flow data within third preset time or continuously n times to obtain second water flow data.
In some embodiments, the specific step of determining whether the current water flow fluctuates according to the collected water flow data includes:
judging whether the difference value between the maximum value and the minimum value in the second water flow data is greater than or equal to a first preset water flow value and less than or equal to a second preset water flow value, if so, determining that the current water flow of the gas water heater has circular fluctuation; if not, the current water flow of the gas water heater does not have circulation fluctuation.
In some embodiments, the gas water heater further comprises, after the current water flow does not have the circulation fluctuation:
acquiring a current actual water flow value of the gas water heater;
calculating the collected actual water flow value to obtain the current demand load;
and controlling the gas water heater to perform heating operation according to the calculated current demand load.
In some embodiments, the current demand load is obtained by the following calculation formula:
wherein Q is the current demand load value, T1 is a preset temperature value, T2 is a water inlet temperature value, Ln is the average value of the multiple sets of water flow data, Lm is a preset water flow, and H is the thermal efficiency of the heating unit water flow.
In some embodiments, the step of re-acquiring the plurality of sets of water flow data specifically includes:
acquiring the first water flow data again;
and continuously acquiring the current water flow data value every second preset time interval, correcting the water flow data acquired last time according to the acquired current water flow data value, and correcting the water flow data within fourth preset time or continuously m times to obtain third water flow data.
In some embodiments, the step of determining whether the current water flow is stable according to the collected water flow data specifically includes:
judging whether the difference value between the maximum value and the minimum value in the third water flow data is smaller than the first preset water flow value and larger than the second preset water flow value or not, if so, judging that the current water flow of the gas water heater is stable; if not, the current water flow of the gas water heater is unstable.
In some embodiments, the gas water heater further comprises after the current water flow is stable:
acquiring the current actual water flow value of the gas water heater again;
calculating the collected actual water flow value to obtain the current demand load;
and controlling the gas water heater to perform heating operation according to the calculated current demand load.
In some embodiments, the gas water heater further comprises, after the current water flow is unstable:
calculating the average value in the third water flow data collected again to obtain the current demand load;
and controlling the gas water heater to perform heating operation according to the calculated current demand load.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. the constant temperature control method of the gas water heater is simple and reliable, and can ensure that the outlet water temperature is relatively constant when the water flow of the gas water heater generates cyclic fluctuation.
2. The design is reasonable, and the use experience of a user can be effectively improved.
Drawings
FIG. 1 is a schematic flow chart of a method for controlling a constant temperature according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a gas water heater with overlapping segment loads according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of the claims of the present invention.
As shown in fig. 1 and 2, this embodiment provides a constant temperature control method for a gas water heater, where the gas water heater applies the constant temperature control method in this embodiment to intelligently identify a water flow fluctuation situation, and when the water flow fluctuates, a stable water flow signal value is obtained by determining whether multiple sets of collected water flow data meet a preset condition and calculating a demand load by using an average value of the multiple sets of water flow data, so as to ensure that the gas water heater is heated constantly and the water outlet temperature is constant, and when the water flow changes suddenly or is stable, the demand load is recalculated by using the latest water flow within a certain time, so that the water outlet temperature can be quickly adjusted to a preset target value after the water flow changes greatly.
As shown in fig. 2, most of the gas water heaters are constant temperature gas water heaters, and 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 are burnt, 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. FIG. 2 is a schematic diagram of a 2-4-6 sectional water heater with different sectional loads overlapped, the intake pressure is generally 2000pa, PL in the diagram is the minimum load of the minimum opening of the sectional small proportional valve, PH is the maximum load of the maximum opening of the sectional small proportional valve, and the opening of the different sectional PL and PH proportional valve are consistent, and the combustion discharge number is controlled by a solenoid valve. In addition, the 2-4 overlap is calculated by 2PH-4 PL-7-6-1 kW, i.e. 23kW is equivalent to 13L/min × 25 ℃,1kW means a water flow of 1L/min, which can be heated by 14 ℃; the 4-6 overlap was calculated by 4PH-6 PL-13-10 kW-3 kW.
In the prior art, most of gas water heaters have a domestic water inlet temperature of 28 ℃, a preset temperature of 42 ℃, a water flow rate of 6.5L/min, a load of 6.5 × (42-28)/(1 × 14) of 6.5kw, wherein 1 × 14 is a unit water flow rate capable of being heated of 14 ℃, if the water flow of the gas water heater of the user is stabilized to 6.5L/min and the inlet pressure is normal 2000pa, the gas water heater works near 2 exhaust PH or near 4PL, but if the water flow of the gas water heater fluctuates back and forth at 5.5L/min-7.5L/min, the actual demand load jumps back and forth between 5.5kw and 7.5kw, i.e. the gas water heater works near 2 exhaust PH for a while works near 4 exhaust PL for a while, so that the gears are switched back and forth, the electromagnetic valve controlling the gears generates a large sound, and the electromagnetic valve controlling the gears is frequently generating an abnormal sound due to the fact that the gears are shifted all the time, and the back-and-forth gear shifting flame is always in an unstable state, flameout is easy to occur, and the water outlet temperature is not constant.
The method for controlling the constant temperature of the gas water heater comprises the following specific steps:
and step S101, starting the gas water heater.
Step S102, collecting the plurality of water flow data values at intervals of second preset time within first preset time to obtain first water flow data.
In this embodiment, the first preset time is preferably set to 2s, the second preset time is preferably set to 100ms, the preset time value is not limited to the above value, and other more suitable values may be selected according to actual needs. In addition, due to most users with unstable water pressure, the fluctuation amount of the water flow is between 0.5L and 1.5L, and within 0.5 s and 2s of the period, the water flow in one or more periods can be detected in one calculation period of 2s in the embodiment, so that the average value is ensured to be basically at a constant value.
And S103, continuously acquiring current water flow data values every second preset time interval, correcting the water flow data acquired last time according to the acquired current water flow data values, and correcting the water flow data within third preset time or continuously n times to obtain second water flow data.
In this embodiment, the third preset time is preferably set to 2s, and the preset time value is not limited to the above value, and other more suitable values may be selected according to actual needs. n is preferably 20 times, but not limited to 20 times, and an appropriate number of times can be selected according to actual requirements. When 20 groups of data collected for 20 times or within 2s are the second water flow data.
In this embodiment, when the gas water heater senses the user's boiling water, the controller collects 1 set of water flow data values every 100ms according to the second preset time, collects 20 sets of data in the first preset time 2s to obtain the first water flow data, i.e. a [0] … a [19], then samples every 100ms according to the third preset time, and discards the a [19] values, i.e.: and a [19] ═ a [18], a [18] ═ a [17], … …, a [1] ═ a [0], a [0] ═ the current value, and so on, continuously acquiring new water flow data values to correct the water flow data corrected last time until 20 groups of latest data are acquired after 20 times of continuous counting or 2s counting down is finished, wherein the 20 groups of latest data are the second water flow data.
Step S104, judging whether the difference value between the maximum value and the minimum value in the second water flow data is greater than or equal to a first preset water flow value and less than or equal to a second preset water flow value;
if so, the current water flow of the gas water heater generates circulation fluctuation;
if not, the current water flow of the gas water heater does not have circulation fluctuation, and the current actual water flow value of the gas water heater is collected; and calculating the acquired actual water flow value to obtain the current demand load, and controlling the gas water heater to heat according to the calculated current demand load.
In this embodiment, the first preset water flow value is preferably 0.5L/min, but not limited to 0.5L/min, and an appropriate value may be selected according to an actual demand, and the second preset water flow value is preferably 2L/min, but not limited to 2L/min, and an appropriate value may be selected according to an actual demand.
In this embodiment, when the difference between the maximum value and the minimum value of 20 groups of data is detected within 20 times or 2s continuously, which is not less than 0.5L/min and not more than 2L/min, it is determined that the water flow of the gas water heater has cyclic fluctuation, and if the water flow of the gas water heater fluctuates back and forth between 5.5L/min and 7.5L/min, the actual demand load jumps back and forth between 5.5kw and 7.5kw at this time, so that gear shifting occurs; and when the difference value between the maximum value and the minimum value of 20 groups of data is detected within 20 times or 2s continuously and is less than 0.5L/min and more than 2L/min, the current water flow of the gas water heater has no circulation fluctuation.
Step S105, if the current water flow has the circulation fluctuation, calculating the average value of the second water flow data to obtain the current demand load;
and controlling the gas water heater to perform heating operation according to the calculated current demand load.
In this embodiment, if the water flow of the gas water heater fluctuates cyclically, the average value of the plurality of sets of water flow data is calculated by using 20 sets of water flow data when the demand load is calculated, so that the heating operation of the gas water heater is basically in a stable state. When the water flow of the user fluctuates from 5.5L/min to 7.5L/min back and forth, the actual demand load jumps back and forth between 5.5kw and 7.5kw, and the gears are switched back and forth, but the average value of a plurality of groups of water flow data is used for calculation, so that the gas water heater can keep the water flow of 6.5L/min to control the heating of the water heater, the output load is ensured to be 6.5kw to realize constant output, the gears are not switched back and forth, and the stable output of the water outlet temperature at 42 ℃ is kept.
In this embodiment, the current demand load is obtained by the following calculation formula:
wherein Q is the current demand load value, T1 is a preset temperature value, T2 is a water inlet temperature value, Ln is the average value of the multiple sets of water flow data, Lm is a preset water flow, and H is the thermal efficiency of the heating unit water flow.
When the temperature of the household inlet water of the user is 28 ℃, the preset temperature is 42 ℃, and the water flow is 6.5L/min, the load is 6.5 x (42-28)/(1 x 14) ═ 6.5kw, wherein 1 x 14 is the heatable unit water flow 14 ℃.
And step S106, after the first water flow data is collected again in the step S102, collecting the current water flow data value continuously every second preset time interval, correcting the water flow data collected last time according to the collected current water flow data value, and correcting the water flow data in fourth preset time or continuously m times to obtain third water flow data.
In this embodiment, the fourth preset time is preferably set to 300ms, and the preset time value is not limited to the above value, and other more suitable values may be selected according to actual needs. m is preferably 3 times, but not limited to 3 times, and an appropriate number of times can be selected according to actual requirements. When 20 groups of data are acquired for 3 times or within 300ms, the data are the third water flow data.
Step S107, judging whether the difference value between the maximum value and the minimum value in the third water flow data is smaller than the first preset water flow value and larger than the second preset water flow value;
if so, the current water flow of the gas water heater is stable, and the current actual water flow value of the gas water heater is collected again; calculating the collected actual water flow value to obtain the current demand load; and controlling the gas water heater to perform heating operation according to the calculated current demand load.
If not, the current water flow of the gas water heater is unstable, calculating the average value of the third water flow data collected again to obtain the current demand load, and controlling the gas water heater to heat according to the calculated current demand load.
In the embodiment, when the difference value between the maximum value and the minimum value of 20 groups of data acquired continuously for 3 times or within 300ms is less than 0.5L/min or more than 2L/min, it is judged that the water flow of the gas water heater has changed greatly, that is, other water consumption points are started, the average value of the current latest 3 groups of water flow data is used for calculating the demand load all the time, and the water heater is controlled to heat according to the calculated demand load; when the difference value between the maximum value and the minimum value of 20 groups of data acquired continuously for 3 times or within 300ms is not less than 0.5L/min and not less than 2L/min, the fact that the water flow of the gas water heater is stable is judged, the current actual water flow is used for calculating the demand load of the load, the water heater is controlled to heat according to the calculated demand load, and therefore heating real-time performance is guaranteed.
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 thermostatic control method of a gas water heater is characterized by comprising the following steps:
starting the gas water heater;
collecting a plurality of groups of water flow data;
judging whether the current water flow has circular fluctuation or not according to the collected water flow data;
if the current water flow has cyclic fluctuation, calculating the average value of the multiple groups of water flow data to obtain the current demand load;
controlling the gas water heater to perform heating work according to the calculated current demand load;
collecting multiple groups of water flow data again;
and judging whether the current water flow is stable or not according to the collected water flow data.
2. The thermostatic control method of a gas water heater according to claim 1, wherein the step of collecting a plurality of sets of water flow data specifically comprises:
collecting the plurality of water flow data values at intervals of second preset time within first preset time to obtain first water flow data;
and continuously acquiring the current water flow data value every second preset time interval, correcting the water flow data acquired last time according to the acquired current water flow data value, and correcting the water flow data within third preset time or continuously n times to obtain second water flow data.
3. The constant temperature control method of the gas water heater according to claim 2, wherein the specific step of judging whether the current water flow fluctuates according to the collected water flow data comprises:
judging whether the difference value between the maximum value and the minimum value in the second water flow data is greater than or equal to a first preset water flow value and less than or equal to a second preset water flow value, if so, determining that the current water flow of the gas water heater has circular fluctuation; if not, the current water flow of the gas water heater does not have circulation fluctuation.
4. The thermostatic control method of a gas water heater as claimed in claim 3, wherein the step of the gas water heater after the current water flow does not have the circulation fluctuation further comprises:
acquiring a current actual water flow value of the gas water heater;
calculating the collected actual water flow value to obtain the current demand load;
and controlling the gas water heater to perform heating operation according to the calculated current demand load.
5. A method as claimed in claim 1The constant temperature control method of the gas water heater is characterized in that the current demand load is obtained by the following calculation formula:
wherein Q is the current demand load value, T1 is a preset temperature value, T2 is a water inlet temperature value, Ln is the average value of the multiple sets of water flow data, Lm is a preset water flow, and H is the thermal efficiency of the heating unit water flow.
6. The thermostatic control method of a gas water heater according to claim 2, wherein the step of re-acquiring a plurality of sets of water flow data specifically comprises:
acquiring the first water flow data again;
and continuously acquiring the current water flow data value every second preset time interval, correcting the water flow data acquired last time according to the acquired current water flow data value, and correcting the water flow data within fourth preset time or continuously m times to obtain third water flow data.
7. The constant temperature control method of a gas water heater according to claim 6, wherein the step of judging whether the current water flow is stable according to the collected water flow data specifically comprises:
judging whether the difference value between the maximum value and the minimum value in the third water flow data is smaller than the first preset water flow value and larger than the second preset water flow value or not, if so, judging that the current water flow of the gas water heater is stable; if not, the current water flow of the gas water heater is unstable.
8. The thermostatic control method for the gas water heater according to claim 7, wherein the gas water heater further comprises after the current water flow is stable:
acquiring the current actual water flow value of the gas water heater again;
calculating the collected actual water flow value to obtain the current demand load;
and controlling the gas water heater to perform heating operation according to the calculated current demand load.
9. The thermostatic control method for the gas water heater according to claim 7, wherein the gas water heater further comprises after the current water flow is unstable:
calculating the average value in the third water flow data collected again to obtain the current demand load;
and controlling the gas water heater to perform heating operation according to the calculated current demand load.
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