CN116294229A - Control method of gas water heater - Google Patents
Control method of gas water heater Download PDFInfo
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- CN116294229A CN116294229A CN202310193075.5A CN202310193075A CN116294229A CN 116294229 A CN116294229 A CN 116294229A CN 202310193075 A CN202310193075 A CN 202310193075A CN 116294229 A CN116294229 A CN 116294229A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 269
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000001105 regulatory effect Effects 0.000 claims abstract description 83
- 238000010438 heat treatment Methods 0.000 claims description 42
- 230000007246 mechanism Effects 0.000 claims description 34
- 238000002485 combustion reaction Methods 0.000 claims description 17
- 238000004364 calculation method Methods 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 8
- 230000001960 triggered effect Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 230000002277 temperature effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 1
- 239000000344 soap Substances 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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- 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
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/184—Preventing harm to users from exposure to heated water, e.g. scalding
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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
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/219—Temperature of the water after heating
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/238—Flow rate
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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
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/305—Control of valves
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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
- F24H15/00—Control of fluid heaters
- F24H15/40—Control of fluid heaters characterised by the type of controllers
- F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
- F24H15/421—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data
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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
- F24H15/00—Control of fluid heaters
- F24H15/40—Control of fluid heaters characterised by the type of controllers
- F24H15/486—Control of fluid heaters characterised by the type of controllers using timers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Fluid Mechanics (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Abstract
The invention discloses a control method of a gas water heater, which comprises the following steps: a flow regulation master control step, comprising: judging whether a control instruction for entering a bypass learning step is received, and entering the bypass learning step when the control instruction for entering the bypass learning step is received; the bypass learning step includes: calculating an error Deltab of the flow regulating valve: Δb=b-B; and (3) exiting the bypass learning step, returning to the flow regulation main control step, and compensating the target step number in the flow regulation main control step by using the error delta b. According to the control method of the gas water heater, the bypass learning step is set, the target bypass ratio of the flow regulating valve and the corresponding target step number are obtained when the flow regulating valve is regulated to the set temperature, the difference value of the actual step number and the target step number is calculated to obtain the error of the flow regulating valve, and the error is compensated to the follow-up control of the flow regulating valve, so that the high-precision control of the flow regulating valve is realized.
Description
Technical Field
The invention belongs to the technical field of household appliances, and particularly relates to a control method of a gas water heater.
Background
At present, water heaters are household appliances commonly used in daily life of people, and the water heaters can be divided into gas water heaters, electric water heaters and solar water heaters according to different heat sources. In the use process, the hot water output by the water heater is output for a user to use through a user terminal (such as a faucet or a shower).
When the output power of the water heater cannot heat the water to the set temperature, the temperature of the water outlet is too low.
In the actual use process of the water heater, when the water is turned off for a short time and hot water is reused, the water temperature can change. Taking a gas water heater as an example, in the normal use process, when a user turns off water and turns on again, the water temperature is increased, then is reduced and is stabilized, and the use experience of the user is further affected.
The existing water inlet control method of the gas water heater in the market mainly adopts modes such as memory alloy control, water valve control, water servo control and the like, the water servo control has the advantage of timely response, and because of water pressure difference used in the home of a user and water servo zero-step position inconsistency caused by processing of parts, when the water heater controls water servo to run to a certain step number, the actual running position of the water servo is also different, the water servo bypass opening is inconsistent, finally, the problem of poor control precision is caused, and the problem of poor constant temperature effect is further solved.
Disclosure of Invention
The invention provides a gas water heater method aiming at the technical problem of poor control precision caused by inconsistent water servo zero-step positions in the prior art, and the method can solve the problems.
In order to achieve the aim of the invention, the invention is realized by adopting the following technical scheme:
the gas water heater control method comprises a heating mechanism, a water inlet main pipe, a water outlet main pipe, a bypass pipe and a flow regulating valve, wherein the heating mechanism is provided with a water inlet end and a water outlet end, the water inlet end of the flow regulating valve is connected with the water inlet main pipe, two water outlet ends of the flow regulating valve are respectively and correspondingly connected with the water inlet end of the heating mechanism and the bypass pipe, one path of the water outlet main pipe is connected with the water outlet end of the heating mechanism, the other path of the water outlet main pipe is connected with the bypass pipe, and the gas water heater control method comprises the following steps:
a flow regulation master control step, comprising:
judging whether a control instruction for entering a bypass learning step is received, and entering the bypass learning step when the control instruction for entering the bypass learning step is received;
the bypass learning step includes:
acquiring an actual bypass ratio H of the flow regulating valve, and acquiring an actual step number B of the flow regulating valve corresponding to the actual bypass ratio H;
obtaining a target bypass ratio h of a flow regulating valve, and obtaining a target step number b of the flow regulating valve corresponding to the target bypass ratio h;
calculating an error Deltab of the flow regulating valve: Δb=b-B;
and (3) exiting the bypass learning step, returning to the flow regulation main control step, and compensating the target step number in the flow regulation main control step by using the error delta b.
In some embodiments, the method for obtaining the actual bypass ratio H includes:
respectively obtaining the water outlet temperature T2 of the heating mechanism, the water outlet temperature T3 of the water outlet main pipe and the water inlet temperature T1 of the water inlet main pipe;
calculating an actual bypass ratio H: h= (T2-T3)/(T2-T1) ×s, where S is a coefficient.
In some embodiments, the method for obtaining the actual bypass ratio h includes:
respectively obtaining the water outlet temperature T2 of the heating mechanism, the water inlet temperature T1 of the water inlet main pipe and the setting temperature T of the water outlet main pipe;
calculating a target bypass ratio h: h= (T2-T set)/(T2-T1) ×s, where S is a coefficient.
In some embodiments, in the bypass learning step, the actual step number or the target step number of the flow rate regulating valve is searched by searching a lookup table in which a relationship between the bypass ratio and the step number is recorded.
In some embodiments, the bypass learning step further includes, before acquiring the actual bypass ratio H of the flow regulating valve and acquiring the target bypass ratio H of the flow regulating valve:
obtaining the water outlet temperature of the water outlet main pipe and the setting temperature of the water outlet main pipe;
and judging the difference value between the water outlet temperature and the water outlet set temperature, and executing other steps of bypass learning when the difference value is smaller than the set temperature difference and the first set time is continued.
In some embodiments, when the difference does not satisfy less than the set temperature difference for a first set time, further comprising:
judging the time of entering the bypass learning step, and executing other steps of bypass learning when the time of entering the bypass learning step meets the second set time.
In some embodiments, the control instructions to enter the bypass learning step are triggered by a user or periodically automatically.
In some embodiments, the flow regulating master step comprises:
acquiring the water inlet temperature of a water inlet main pipe and the setting temperature of a water outlet main pipe, and calculating the target water flow;
judging whether the combustion can be heated to the set temperature, and controlling the flow regulating valve to shrink one path of outlet water entering the heating mechanism when the combustion cannot be heated to the set temperature until the outlet water flow reaches the shrink target water flow.
In some embodiments, the method of calculating the target water flow rate Q includes:
dividing temperature intervals, wherein each temperature interval is correspondingly provided with a temperature difference calculation formula;
judging a temperature interval in which the set temperature is located, and acquiring a corresponding temperature difference calculation formula;
calculating a temperature difference according to the acquired temperature difference calculation formula;
and calculating the target water flow Q according to the temperature difference.
In some embodiments, the method of calculating the target water flow rate Q from the temperature difference is:
q=1 maximum heat load 25/Δt.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the control method of the gas water heater, the bypass learning step is set, the target bypass ratio of the flow regulating valve and the corresponding target step number are obtained when the flow regulating valve is regulated to the set temperature, boiled water is combusted under the opening degree of the bypass ratio, the actual bypass ratio and the corresponding actual target step number are obtained, if the zero position of the flow regulating valve is not offset, after the combustion is stable, the outlet water temperature is equal to the set temperature, the actual bypass ratio is equal to the target bypass ratio, the actual step number is equal to the target step number, otherwise, the difference value of the actual step number equal to the target step number is calculated to be the error of the flow regulating valve, and the error is compensated to the follow-up control of the flow regulating valve, so that the high-precision control of the flow regulating valve is realized.
Other features and advantages of the present invention will become apparent upon review of the detailed description of the invention in conjunction with the drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a system schematic diagram of one embodiment of a gas water heater of the present invention;
FIG. 2 is a flow chart of a method for controlling a gas water heater according to an embodiment of the present invention.
Description of the embodiments
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
The embodiment provides a constant temperature control method of a gas water heater, as shown in fig. 1, the gas water heater adopted in the control method comprises a heating mechanism 30, a water inlet main pipe 10, a water outlet main pipe 20, a bypass pipe 50 and a flow regulating valve 40, wherein the heating mechanism 30 is provided with a water inlet end and a water outlet end, the water inlet end 151 of the flow regulating valve 40 is connected with the water inlet main pipe 10, the flow regulating valve 40 is provided with two water outlet ends, one water outlet end is connected with the water inlet end of the heating mechanism, the other water outlet end is connected with the bypass pipe 50, one of the water outlet main pipes 20 is connected with the water outlet end of the heating mechanism, and the other water outlet pipe is connected with the bypass pipe 50.
The water inlet manifold 10 is used for connecting a tap water pipe, and cold water entering from tap water can only flow into the water inlet end of the heating mechanism 30 or can be divided into two paths through the adjustment of the flow regulating valve 40, wherein one path of cold water flows into the water inlet end of the heating mechanism 30, and the other path of cold water flows into the bypass pipe 50. The flow rate adjusting valve 40 can also adjust the flow rate ratio of the two water outlets.
Under the condition that the zero-step positions of the flow regulating valve 40 are inconsistent due to the difference of water pressure used in the home of a user and the processing of parts, when the flow regulating valve 40 runs to a certain step number, the actual running positions of the flow regulating valve 40 are also different, and the bypass opening of the flow regulating valve 40 is inconsistent. Assuming that the bypass ratio of the water heater control flow regulating valve 40 is twenty percent, the bypass ratio of the flow regulating valve 40 is only fifteen percent actually due to the problem of non-uniform consistency of the flow regulating valve 40, the mixing proportion of cold water is reduced, the water outlet temperature of the water heater is higher, otherwise, the water outlet temperature of the water heater is lower, and in general, the non-uniform consistency of the flow regulating valve 40 can lead to poor constant temperature effect of the water heater. At present, the problems of single water servo, double water servo and double water driving servo exist.
In order to solve the problem of water servo consistency, the present embodiment can correct the preset bypass ratio through the self-learning function, adjust the number of water servo operation steps, ensure that the bypass required opening and the actual opening of the flow regulating valve 40 are unified, and improve the constant temperature effect of the water heater. The control method is particularly suitable for controlling the double-drive water servo capable of simultaneously adjusting the water flow of two paths.
As shown in fig. 2, the control method of the gas water heater of the present embodiment includes:
a flow regulation master control step, comprising:
judging whether a control instruction for entering a bypass learning step is received, and entering the bypass learning step when the control instruction for entering the bypass learning step is received;
the bypass learning step includes:
acquiring an actual bypass ratio H of the flow regulating valve, and acquiring an actual step number B of the flow regulating valve corresponding to the actual bypass ratio H;
obtaining a target bypass ratio h of a flow regulating valve, and obtaining a target step number b of the flow regulating valve corresponding to the target bypass ratio h;
calculating an error Deltab of the flow regulating valve: Δb=b-B;
and (3) exiting the bypass learning step, returning to the flow regulation main control step, and compensating the target step number in the flow regulation main control step by using the error delta b.
According to the control method of the gas water heater, through setting the bypass learning step, the target bypass ratio of the flow regulating valve and the corresponding target step number are obtained when the flow regulating valve is regulated to the set temperature, boiled water is combusted under the opening degree of the bypass ratio, the actual bypass ratio and the corresponding actual target step number are obtained, if the zero position of the flow regulating valve is not offset, after the combustion is stable, the outlet water temperature is equal to the set temperature, the actual bypass ratio is equal to the target bypass ratio, the actual step number is equal to the target step number, otherwise, the difference value of the actual step number equal to the target step number is calculated to be the error of the flow regulating valve, and the error is compensated to the follow-up control of the flow regulating valve, so that the high-precision control of the flow regulating valve is realized.
In some embodiments, the method for obtaining the actual bypass ratio H includes:
and respectively obtaining the water outlet temperature T2 of the heating mechanism, the water outlet temperature T3 of the water outlet main pipe and the water inlet temperature T1 of the water inlet main pipe.
Calculating an actual bypass ratio H: h= (T2-T3)/(T2-T1) ×s, where S is a coefficient.
In some embodiments, the method for obtaining the actual bypass ratio h includes:
respectively obtaining the water outlet temperature T2 of the heating mechanism, the water inlet temperature T1 of the water inlet main pipe and the setting temperature T of the water outlet main pipe;
calculating a target bypass ratio h: h= (T2-T set)/(T2-T1) ×s, where S is a coefficient.
The coefficient S is a constant coefficient and is stored in the storage module, and can be set according to actual requirements during initial writing.
When the water heater is in normal combustion, after the user turns off water, the flow regulating valve 40 is adjusted according to the step number corresponding to the target bypass ratio h, and under the step number, the outlet water temperature is considered to be just up to the set temperature. If the flow regulating valve 40 is inconsistent in zero step position caused by water pressure difference and part processing, the actual step number is inconsistent with the target step number, the difference between the actual step number and the target step number is calculated to compensate the flow regulating valve 40, so that the actual step number is consistent with the target step number in the subsequent control step, the accuracy of regulating and controlling the temperature is improved, and the constant temperature effect is realized.
In some embodiments, in the bypass learning step, the actual number of steps or the target number of steps of the flow regulating valve is searched by searching a lookup table in which a relationship between the bypass ratio and the number of steps is recorded.
The lookup table is stored in the memory module, and the correspondence between the bypass ratio of the flow rate regulating valve 40 and the number of steps is recorded therein, and the bypass ratio is generally calculated in the flow rate control, and the number of steps corresponding thereto is obtained by looking up the lookup table. After the step number is obtained, the flow regulating valve is controlled to move to the corresponding step number so as to realize the regulation and control of the flow.
In some embodiments, the bypass learning step, before obtaining the actual bypass ratio H of the flow regulating valve and obtaining the target bypass ratio H of the flow regulating valve, further includes:
obtaining the water outlet temperature of the water outlet main pipe and the setting temperature of the water outlet main pipe;
and judging the difference value between the water outlet temperature and the water outlet set temperature, and executing other steps of bypass learning when the difference value is smaller than the set temperature difference and the first set time is continued.
The difference being smaller than the set temperature difference indicates that the difference is not particularly large, and therefore the difference is found by continuing to perform other steps of bypass learning.
When the difference is not smaller than the set temperature difference, the difference is larger, and the reason for this problem is various, and it is possible that the ignition time is shorter, and it is also possible that other faults occur in the water heater, so in order to solve the problem, in some embodiments, when the difference is not smaller than the set temperature difference and lasts for the first set time, the method further includes:
judging the time of entering the bypass learning step, and executing other steps of bypass learning when the time of entering the bypass learning step meets the second set time.
By judging the time for entering the learning step, the problem of larger deviation between the water outlet temperature and the set temperature caused by shorter ignition time can be solved. When the time for entering the bypass learning step is not longer than the second set time, the mode only needs to keep the ignition combustion continuously, and the part of water which is not heated uniformly in the pipe section is discharged.
When the time for entering the bypass learning step is longer than the second set time, the problem that the temperature detection element is failed or other failure causes are possibly solved due to insufficient combustion time, and other steps for continuing to perform the bypass learning are enough at the moment, so that the accuracy of the bypass learning is not affected.
In some embodiments, the control instructions to enter the bypass learning step may be triggered by the user or automatically on a periodic basis.
When triggered by a user, the method can be used for defining additional functions by setting a special trigger key or performing specific operation on the existing key, for example, a mode of closing the machine and long-pressing the waterfall washing key, namely, entering a bypass learning step.
In some embodiments, the flow regulating master step comprises:
acquiring a water inlet temperature T1 of a water inlet main pipe and a set temperature T of a water outlet main pipe, and calculating target water flow;
judging whether the combustion can be heated to the set temperature, and when the combustion can not be heated to the set temperature, controlling the flow regulating valve to carry out shrinkage control on one path of outlet water entering the heating mechanism until the outlet water flow reaches the shrinkage target water flow.
It can be understood that in the step of judging whether the combustion can be heated to the set temperature, for the gas water heater, the combustion can be the current combustion working condition of the gas water heater or the maximum combustion output power of the gas water heater.
When the combustion can be heated to the set temperature, water is continuously used, and the shrinkage is not needed.
In this embodiment, the method for calculating the target water flow Q includes:
dividing temperature intervals, wherein each temperature interval is correspondingly provided with a temperature difference calculation formula;
judging a temperature interval in which the set temperature is located, and acquiring a corresponding temperature difference calculation formula;
calculating a temperature difference according to the acquired temperature difference calculation formula;
and calculating the target water flow Q according to the temperature difference.
The higher the set temperature, the more energy is required. By dividing the temperature interval, the set temperatures in the same temperature interval are obtained by adopting the same calculation formula, and the formula set quantity can be effectively reduced.
The temperature difference calculation formula corresponding to each temperature interval is as follows:
when the set temperature is more than or equal to 60 ℃, the temperature difference delta t=T is set to be-T1-5.
When 50.ltoreq.the set temperature <60 ℃, the temperature difference Δt=50-T1.
When the set temperature is <50 ℃, the temperature difference Δt=tset-T1.
Wherein T is set to be the set temperature, and T1 is the water inlet temperature. The unit of the constants inside the formula is degrees celsius.
The method for calculating the target water flow Q according to the temperature difference comprises the following steps:
q=1 maximum heat load 25/Δt.
The maximum heating capacity of the gas water heater is reflected by the maximum heat load of the gas water heater, and the value is fixed when leaving the factory.
After the gas water heater is powered on and started, the gas water heater further comprises a flow regulating valve which is regulated to 300 steps for standby. In this position, both the shrink control and the bypass control can be achieved quickly, and the reaction rate can be increased.
Before the flow regulating valve is regulated to 300 steps, the flow regulating valve is zeroed, so that the regulation accuracy is improved.
And (3) returning to zero by the flow regulating valve, and compensating the target step number in the flow regulating main control step by utilizing the error delta b calculated in the bypass learning step.
When no cold water enters the bypass pipe 50, the hot water output by the water outlet end of the heating mechanism 30 enters the water outlet main pipe 20 to be directly supplied to a user. When cold water enters the bypass pipe 50, the cold water in the bypass pipe 50 is mixed with hot water output from the water outlet end of the heating mechanism 30, and the mixed water is supplied to a user through the water outlet main pipe 20.
When the gas water heater is started initially or started again longer than the previous water consumption time, the temperature of the heating mechanism 30 is lower, and after ignition combustion is started, the water output from the water outlet end of the gas water heater is gradually raised to be close to the set temperature after the water is subjected to low temperature, and under the working condition, the bypass pipe 50 is not required to be started to mix cold water with the water output from the heating mechanism.
When the gas water heater is in the working process, the user turns off water and turns on water again in a certain time, at this time, the heating mechanism 30 is still hot, partial water temperature can be increased after the water is turned on again for ignition, the water temperature is higher than the set temperature, the temperature gradually tends to be set, if the water is turned on again for ignition and then is directly output to the user, the body feeling of the user is poor, and the risk that the user is scalded by high-temperature water exists. At this time, the bypass pipe 50 is controlled to enter the cold water, and the cold water is mixed with the hot water output from the water outlet end of the heating mechanism 30 and supplied to the user, so that the above problem can be avoided.
In some embodiments of the present invention, the flow regulating master control step includes:
a condition judgment step of entering bypass adjustment, wherein when the condition of entering bypass adjustment is met, the bypass adjustment step is entered;
and a bypass adjusting step, namely acquiring a bypass ratio of the flow adjusting valve, and adjusting the flow of the flow adjusting valve entering the water inlet end of the heating mechanism and the bypass pipe respectively according to the bypass ratio.
The bypass adjustment is not required to be started at any time, and therefore, in some embodiments of the present invention, a condition for entering the bypass adjustment is provided, and when it is judged that the condition for entering the bypass adjustment is satisfied, the water flow of one path of the bypass pipe 50 is started.
In some embodiments of the present invention, the purpose of opening the bypass adjustment is to reduce the temperature of the water outlet of the heating mechanism 30 and prevent the temperature from being too high, so in order to achieve the purpose of reducing the temperature of the mixed water, the adjustment modes of the flow rate adjustment valve 40 have at least two modes, one mode is to reduce the water entering the heating mechanism 30 for heating, and the other mode is to increase the cold water entering the bypass pipe 50, in this embodiment, the bypass ratio of the flow rate adjustment valve 40 is adjusted to achieve the purpose of controlling the flow rates of the two water outlet ends thereof, and the purpose of controlling the temperature of the water finally outputted from the water outlet manifold 20 to be constant is achieved.
In some embodiments of the present invention, the condition determining step for entering the bypass adjustment includes:
judging whether to shut down the water or stop zero cold water circulation heating, and entering a bypass adjusting step when any condition of shutting down the water or stopping zero cold water circulation heating is met.
The water supply is shut down, namely, the gas water heater is shut down by a user in the working process, and the water supply is shut down in the using process because of the conventional operation required by some individuals of the user, and the water supply is possibly shut down in the middle of various reasons such as soap, shower gel, hair washing and the like. The sudden rise of the water outlet temperature of the water for starting generally occurs when the water is stopped and started again, so that the scheme judges whether the water is stopped or not as one of conditions for entering bypass regulation, and accurate control is realized.
Zero cold water circulation heating generally occurs in the process that a user does not use the gas water heater, and in order to output warm water when the user turns on water for the first time or longer than the previous time, zero cold water heating circulation is performed when the user does not use the gas water heater, and cold water in a circulation heating pipeline is used. The bypass pipe 50 cannot be opened during zero cold water circulation, and therefore, in this embodiment, the bypass adjustment step is performed by taking the stop of zero cold water circulation heating as another condition for judging that the bypass adjustment step is performed.
By the two conditions, the situation that the bypass adjustment step cannot be entered can be eliminated, and the preliminary screening control is entered into the bypass adjustment step.
The bypass adjustment is opened according to the above-mentioned scheme, especially for the situation that the water outlet temperature of the heating mechanism is too high, even if the two conditions are satisfied, the bypass adjustment step is not needed to be entered when the water outlet temperature of the heating mechanism is not too high, so that the scope of the bypass adjustment can be further narrowed by the judging step, and the situation that the water outlet temperature of the water outlet manifold 20 is too low due to the incorrect bypass adjustment is avoided, which is the opposite situation.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. The control method of the gas water heater is characterized in that the gas water heater comprises a heating mechanism, a water inlet main pipe, a water outlet main pipe, a bypass pipe and a flow regulating valve, wherein the heating mechanism is provided with a water inlet end and a water outlet end, the water inlet end of the flow regulating valve is connected with the water inlet main pipe, two water outlet ends of the flow regulating valve are respectively and correspondingly connected with the water inlet end of the heating mechanism and the bypass pipe, one path of the water outlet main pipe is connected with the water outlet end of the heating mechanism, the other path of the water outlet main pipe is connected with the bypass pipe, and the control method of the gas water heater comprises the following steps:
a flow regulation master control step, comprising:
judging whether a control instruction for entering a bypass learning step is received, and entering the bypass learning step when the control instruction for entering the bypass learning step is received;
the bypass learning step includes:
acquiring an actual bypass ratio H of the flow regulating valve, and acquiring an actual step number B of the flow regulating valve corresponding to the actual bypass ratio H;
obtaining a target bypass ratio h of a flow regulating valve, and obtaining a target step number b of the flow regulating valve corresponding to the target bypass ratio h;
calculating an error Deltab of the flow regulating valve: Δb=b-B;
and (3) exiting the bypass learning step, returning to the flow regulation main control step, and compensating the target step number in the flow regulation main control step by using the error delta b.
2. The gas water heater control method according to claim 1, wherein the obtaining method of the actual bypass ratio H includes:
respectively obtaining the water outlet temperature T2 of the heating mechanism, the water outlet temperature T3 of the water outlet main pipe and the water inlet temperature T1 of the water inlet main pipe;
calculating an actual bypass ratio H: h= (T2-T3)/(T2-T1) ×s, where S is a coefficient.
3. The gas water heater control method according to claim 1, wherein the obtaining method of the actual bypass ratio h includes:
respectively obtaining the water outlet temperature T2 of the heating mechanism, the water inlet temperature T1 of the water inlet main pipe and the setting temperature T of the water outlet main pipe;
calculating a target bypass ratio h: h= (T2-T set)/(T2-T1) ×s, where S is a coefficient.
4. The method according to claim 1, wherein in the bypass learning step, the actual step number or the target step number of the flow rate regulating valve is searched by searching a lookup table in which a relationship between the bypass ratio and the step number is recorded.
5. The gas water heater control method according to claim 1, wherein the bypass learning step further includes, before acquiring the actual bypass ratio H of the flow rate regulating valve and acquiring the target bypass ratio H of the flow rate regulating valve:
obtaining the water outlet temperature of the water outlet main pipe and the setting temperature of the water outlet main pipe;
and judging the difference value between the water outlet temperature and the water outlet set temperature, and executing other steps of bypass learning when the difference value is smaller than the set temperature difference and the first set time is continued.
6. The gas water heater control method as recited in claim 5, further comprising, when the difference does not satisfy less than a set temperature difference for a first set time:
judging the time of entering the bypass learning step, and executing other steps of bypass learning when the time of entering the bypass learning step meets the second set time.
7. A gas water heater control method as claimed in any one of claims 1 to 6, wherein the control instruction to enter the bypass learning step is triggered by a user or automatically on a regular basis.
8. The gas water heater control method according to any one of claims 1 to 6, wherein the flow rate adjustment master control step includes:
acquiring the water inlet temperature of a water inlet main pipe and the setting temperature of a water outlet main pipe, and calculating the target water flow;
judging whether the combustion can be heated to the set temperature, and controlling the flow regulating valve to shrink one path of outlet water entering the heating mechanism when the combustion cannot be heated to the set temperature until the outlet water flow reaches the shrink target water flow.
9. The gas water heater control method as recited in claim 8, wherein the target water flow rate Q calculation method includes:
dividing temperature intervals, wherein each temperature interval is correspondingly provided with a temperature difference calculation formula;
judging a temperature interval in which the set temperature is located, and acquiring a corresponding temperature difference calculation formula;
calculating a temperature difference according to the acquired temperature difference calculation formula;
and calculating the target water flow Q according to the temperature difference.
10. The control method of a gas water heater according to claim 9, wherein the method of calculating the target water flow rate Q from the temperature difference is:
q=1 maximum heat load 25/Δt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310193075.5A CN116294229A (en) | 2023-03-01 | 2023-03-01 | Control method of gas water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310193075.5A CN116294229A (en) | 2023-03-01 | 2023-03-01 | Control method of gas water heater |
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| Publication Number | Publication Date |
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| CN116294229A true CN116294229A (en) | 2023-06-23 |
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| CN202310193075.5A Pending CN116294229A (en) | 2023-03-01 | 2023-03-01 | Control method of gas water heater |
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| Country | Link |
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| CN (1) | CN116294229A (en) |
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2023
- 2023-03-01 CN CN202310193075.5A patent/CN116294229A/en active Pending
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