CN116642272A - Control method of gas water heating system and gas water heating system - Google Patents
Control method of gas water heating system and gas water heating system Download PDFInfo
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- CN116642272A CN116642272A CN202310906765.0A CN202310906765A CN116642272A CN 116642272 A CN116642272 A CN 116642272A CN 202310906765 A CN202310906765 A CN 202310906765A CN 116642272 A CN116642272 A CN 116642272A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 44
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 36
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims description 15
- 230000000694 effects Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
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Classifications
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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
- F24H15/335—Control of pumps, e.g. on-off control
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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
- F24H15/104—Inspection; Diagnosis; Trial operation
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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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Abstract
The application relates to the field of residential hot water supply systems, and particularly discloses a control method of a gas hot water system and the gas hot water system, wherein the method comprises the following steps: starting a water pump assembly, and obtaining the frequency of a water quantity servo control switch valve; calculating a water flow average value according to the frequency of the control switch valve of the water flow server; matching the calculated average value of the water flow with a pre-stored actual measurement database in the main controller, identifying the length of the hot water pipeline, calculating the water capacity of the hot water pipeline, and calculating the optimal cyclic heating time according to the water capacity; the main controller performs cyclic heating according to the optimal cyclic heating time. The beneficial technical effects of the application include: by the optimized control method, quantitative circulating heating of the gas water heating system is realized, hot water in the hot water pipeline is prevented from flowing into the cold water pipeline, the influence of the circulating system on the water purifier in the cold water pipeline is further reduced, and meanwhile, the consumption of gas is greatly reduced.
Description
Technical Field
The application relates to the field of residential hot water supply systems, in particular to a control method of a gas hot water system.
Background
The gas water heater is an indispensable living article in modern families, can rapidly provide hot water, and meets living demands of people. The traditional gas water heater needs to preheat a certain amount of water to reach the required temperature, so that certain energy waste is caused, the water outlet speed of hot water is slow, the user experience is poor, and potential safety hazards such as dry burning or electric leakage can occur in the use process. Along with the continuous improvement of energy-saving and environment-friendly consciousness and the improvement of the demands of markets on the safety and the use experience of the water heater, gas water heater manufacturers begin to develop novel water heater products, wherein the novel water heater products comprise the gas water heater with zero cold water type. The zero cold water type gas water heater can directly heat cold water to a required temperature, so that the preheating process is avoided, the use is more convenient and quick, the zero cold water type gas water heater adopts the dry burning prevention and leakage protection technology, the power supply can be automatically cut off under abnormal conditions, and the occurrence of safety accidents is avoided.
Gas water heating systems are typically provided with a one-way valve between the hot water line and the cold water line that prevents cold water from flowing back into the hot water line. In a zero cold water type gas water heating system, a gas water heater is generally installed between a user water inlet pipe and a water using terminal, and is used for heating water provided by the user water inlet pipe and providing the heated water to the water using terminal. Among which water terminals include, but are not limited to, hot water faucets and cold water faucets. The water inlet of the gas water heater is connected with a user water inlet pipe, the user water inlet pipe is connected with a cold water tap through a cold water pipeline, the water outlet of the gas water heater is connected with the hot water tap through a hot water pipeline, and the hot water pipeline is connected with the cold water pipeline through a one-way valve.
In the installation scene, the zero cold water type gas water heating system usually has two states of a water return pipeline and a water return pipeline. Under the state of having the water return pipeline, hot water can form an internal circulation through independent water return pipeline and gas heater to avoid hot water inflow cold water pipeline in, this kind of mode is more convenient for the family, but needs additional installation water return pipeline, has increased installation cost. In the state without a water return pipeline, the circulating system of the whole gas water heating system needs to use the cold water pipeline as the water return pipe, so that the problem that hot water flows into the cold water pipeline exists, and the service life of the water purifier in the cold water pipeline can be influenced. Because the water purifier needs to filter and purify cold water, the water filtered by the water purifier can be degraded by the circularly heated water, so that the service life of the water purifier is influenced. In addition, in the internal circulation process of the existing gas water heating system without a water return pipeline, in order to keep the water flow temperature in the hot water pipeline and realize the zero cold water function, a technical scheme of continuously burning gas to circularly heat water in the pipeline is generally adopted, so that hot water can continuously flow in the internal circulation even if a water terminal is not opened for a long time, and the waste of gas is caused.
Disclosure of Invention
The application aims to solve the technical problems that: at present, the technical problem that hot water flows into a cold water pipeline when a zero cold water type gas water heater is in a state without a return water pipeline is solved, a control method of a gas water heating system and the gas water heating system are provided, hot water in the cold water pipeline is reduced through an optimal control method, the influence of a circulating system on a water purifier in the cold water pipeline is reduced, and meanwhile consumption of gas is reduced.
In order to solve the technical problems, the application adopts the following technical scheme: the control method of the gas water heating system is suitable for the gas water heating system comprising a hot water pipeline, a cold water pipeline, a one-way valve and a gas water heater, wherein the gas water heater comprises a water pump assembly, a water volume server and a main controller, and comprises the following steps:
step S1, starting a water pump assembly to obtain the frequency of a water quantity servo control switch valve;
s2, calculating a flow average value according to the frequency of a control switch valve of the water quantity server;
step S3, matching the calculated average value of the flow quantity with an actual measurement database stored in the main controller in advance, and identifying the length of a hot water pipeline;
step S4, calculating the water capacity of the hot water pipeline according to the length of the hot water pipeline;
step S5, dividing the water capacity of the hot water pipeline by the average value of the water flow quantity to obtain the optimal circulating heating time;
and S6, the main controller executes cyclic heating according to the optimal cyclic heating time.
The water quantity servo is a device for controlling water flow, is mainly applied to household appliances such as water heaters, washing machines, dish washers and the like, and aims to achieve the purposes of saving water and energy. The main principle of the water quantity servo is that the sensor detects water flow and controls the switch of the switch valve according to the set water quantity threshold value, thereby controlling the water flow and achieving the effect of saving energy.
According to the optimization of the control method of the gas water heating system, the length of the hot water pipeline is identified by means of calculation and analysis of the main controller, then series operation is carried out according to the length of the hot water pipeline, the optimal circulating heating time is calculated, and finally the main controller is used for executing circulating heating in the optimal circulating heating time, so that the internal circulating state of the water heater pipeline is stopped after the water in the water heater pipeline just heats the whole hot water pipeline, the function of preventing cold water from flowing backwards through the check valve is combined, the purposes that one end of the check valve facing the hot water pipeline is hot water and one end of the check valve facing the cold water pipeline is cold water are achieved subtly, namely quantitative circulating heating of the gas water heating system is achieved, hot water in the hot water pipeline is prevented from flowing into the cold water pipeline, the influence of the circulating system on the water purifier in the cold water pipeline is reduced, and meanwhile compared with the scheme that the existing gas water heating system continuously executes circulating heating is greatly reduced.
Preferably, the water volume server includes a water volume detecting unit, a water volume controller, and a switch valve, and in step S1, the method for obtaining the frequency of controlling the switch valve by the water volume server includes:
periodically acquiring the water flow speed detected by the water flow detection unit;
multiplying the detected water flow speed by the detection period to obtain the water flow quantity of the current period;
judging whether the water flow rate of the current period exceeds a preset water flow rate threshold value, if so, controlling the switch valve to be closed, and if not, controlling the switch valve to be opened;
and recording the operation time and state of the control switch valve each time to obtain the frequency of the control switch valve of the water quantity server.
Preferably, in step S2, the method for calculating the average value of the flow rate according to the frequency of the control switch valve of the water volume server includes:
calculating the water flow in a preset time according to the frequency of a control switch valve of the water flow server;
and solving an average value of the water flow in the preset time to obtain an average value of the water flow.
Preferably, the flow rate within the preset time is specifically calculated by the following formula:
wherein Q represents the water flow in the preset time, and F represents the frequency of the water flow servo control switch valve.
Preferably, the water capacity in the hot water pipeline is specifically calculated by the following formula:
wherein C represents the water capacity in the hot water pipeline, L represents the length of the hot water pipeline, and S represents the cross-sectional area of a standard hot water pipeline in the household hot water system.
Preferably, in step S5, the method for performing cyclic heating by the main controller according to the optimal cyclic heating time includes:
the main controller controls the water pump assembly to start and controls the water pump assembly to run in the optimal cyclic heating time;
and after the optimal cyclic heating time is over, the main controller controls the water pump assembly to stop running.
Preferably, the hot water pipe is provided with a water temperature detecting unit, and in step S5, the method for executing cyclic heating by the main controller according to the optimal cyclic heating time further includes:
the water temperature detection unit periodically detects the water flow temperature in the hot water pipeline;
when the water flow temperature is higher than a preset temperature threshold value, the main controller maintains the running state of the current water pump assembly, and when the water flow temperature is lower than the preset temperature threshold value, the main controller executes the following steps:
the main controller controls the water pump assembly to start and controls the water pump assembly to run in the optimal cyclic heating time;
and after the optimal cyclic heating time is over, the main controller controls the water pump assembly to stop running.
A gas water heating system for performing a control method of a gas water heating system as described above, comprising:
the gas water heater comprises a water pump assembly, a water quantity server and a main controller, wherein the water pump assembly is used for providing power for the circulation heating of the gas water heater, the water quantity server is used for detecting the water flow speed and adjusting the water flow quantity, and the water pump assembly and the water quantity server are electrically connected with the main controller;
the hot water pipeline is communicated with the water outlet of the gas water heater, and the cold water pipeline is communicated with the water inlet of the gas water heater;
a one-way valve is communicated between the hot water pipeline and the cold water pipeline to form a circulating waterway.
Preferably, the hot water pipeline is provided with a water temperature detection unit, and the water temperature detection unit is used for detecting the water flow temperature in the hot water pipeline.
The beneficial technical effects of the application include: the control method of the gas water heating system and the gas water heating system are adopted, the length of a hot water pipeline is identified by means of calculation and analysis of a main controller, then series operation is carried out according to the length of the hot water pipeline, the optimal circulating heating time is calculated, finally the main controller is used for executing circulating heating in the optimal circulating heating time, so that the water in the water heater pipeline stops the internal circulating state of the water heater pipeline after just heating the whole hot water pipeline, the function of preventing cold water backflow is combined with a one-way valve, the purpose that one end of the one-way valve facing the hot water pipeline is hot water and one end of the one-way valve facing the cold water pipeline is cold water is achieved subtly, the quantitative circulating heating of the gas water heating system is achieved, the hot water in the hot water pipeline is prevented from flowing into the cold water pipeline, the influence of the circulating system on a water purifier in the cold water pipeline is further reduced, and meanwhile compared with the scheme that the existing gas water heating system continuously executes circulating heating is greatly reduced; the frequency of the control switch valve is dynamically adjusted according to the water quantity change condition in the water heater, so that a better control effect is achieved, and water resources are saved; by periodically detecting the water flow temperature in the hot water pipeline, when the water flow temperature is lower than a preset temperature threshold value, quantitative circulating heating of the gas water heating system is executed, so that the operation times of the gas water heater in an internal circulation state are reduced while the water temperature in the hot water pipeline is ensured, and the consumption of gas is greatly reduced.
Other features and advantages of the present application will be disclosed in the following detailed description of the application and the accompanying drawings.
Drawings
The application is further described with reference to the accompanying drawings:
FIG. 1 is a flow chart of a control method of a gas water heating system according to an embodiment of the application.
FIG. 2 is a flowchart of a method for obtaining the frequency of controlling a switch valve of a water volume server according to an embodiment of the present application.
FIG. 3 is a flowchart of a method for performing cyclic heating by a main controller according to an optimal cyclic heating time according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a gas water heating system according to an embodiment of the present application.
FIG. 5 is a schematic cross-sectional view of a gas water heater according to an embodiment of the present application.
Wherein: 1. the water inlet, 2, the water outlet, 3, the check valve, 4, the water quantity server, 5, the hot water pipeline, 6, the cold water pipeline, 7, the water pump assembly, 8, the main control unit.
Detailed Description
The technical solutions of the embodiments of the present application will be explained and illustrated below with reference to the drawings of the embodiments of the present application, but the following embodiments are only preferred embodiments of the present application, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present application.
In the following description, directional or positional relationships such as the terms "inner", "outer", "upper", "lower", "left", "right", etc., are presented for convenience in describing the embodiments and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.
The embodiment of the application provides a control method of a gas water heating system, which is suitable for the gas water heating system comprising a hot water pipeline 5, a cold water pipeline 6, a one-way valve 3 and a gas water heater, wherein the gas water heater comprises a water pump assembly 7, a water quantity server 4 and a main controller 8, and referring to fig. 1, the control method comprises the following steps:
step S1, the water pump assembly 7 is started, and the frequency of the control switch valve of the water quantity server 4 is obtained.
Wherein, in the state of gas hot water system internal circulation, water pump assembly 7 is used for providing power for the internal circulation. The water quantity servo 4 is a combined device for controlling water flow, is mainly applied to household appliances such as water heaters, washing machines, dish washers and the like, and aims to achieve the purposes of saving water and energy. The main principle of the water quantity servo 4 is that the water flow is detected by an internal sensor, and the switch of a switch valve is controlled according to a set water quantity threshold value, so that the water flow is controlled, and the effect of saving energy is achieved.
And S2, calculating the average value of the water flow according to the frequency of controlling the switch valve by the water quantity server 4.
And step S3, matching the calculated average value of the flow quantity with an actual measurement database stored in the main controller 8 in advance, and identifying the length of the hot water pipeline 5.
The content of the actual measurement database is data of pressure difference delta P (Mpa) in the pipeline and actual flow average value Q' (L/min) in the pipeline, which are matched with the length L (m) of the hot water pipeline 5, under the condition of different lengths L (m) of the hot water pipeline 5.
The pressure difference delta P (Mpa) in the pipeline can be measured by a pressure sensor, and the data of the actual flow average value Q' (L/min) in the pipeline can be obtained by a water quantity sensor, a flowmeter, a pressure sensor or a liquid level sensor.
For example, after the water pump is started, an actual measurement database formed by data of the length L (m), the pressure difference Δp (Mpa) and the actual flow average Q' (L/min) of the hot water pipeline 5 obtained by test is shown in the following table:
it can be seen from the exemplary measured database that the longer the hot water line 5, the smaller the pressure differential Δp in the gas water heater line, and the smaller the actual flow average in the line, with the power provided by the water pump assembly 7 remaining unchanged. In this embodiment, the measured database obtained by the test is stored in the main controller 8 of the gas water heater in advance.
Step S4, calculating the water capacity of the hot water pipeline 5 according to the length of the hot water pipeline 5;
step S5, dividing the water capacity of the hot water pipeline 5 by the average value of the water flow quantity to obtain the optimal circulating heating time;
in step S6, the main controller 8 performs cyclic heating according to the optimal cyclic heating time.
Through the optimization of the control method of the gas water heating system, the length of the hot water pipeline 5 is identified by means of the calculation and analysis of the main controller 8, the optimal circulating heating time is calculated according to the length of the hot water pipeline 5, and finally, the main controller 8 is used for executing circulating heating in the optimal circulating heating time, so that the internal circulating state of the water heater pipeline is stopped after the water in the water heater pipeline just heats the whole hot water pipeline 5, the function of preventing cold water from flowing backwards by combining the check valve 3 is realized, the one end of the check valve 3 facing the hot water pipeline 5 is hot water, the one end of the check valve 3 facing the cold water pipeline 6 is cold water, namely the quantitative circulating heating of the gas water heating system is realized, compared with the scheme of continuously executing circulating heating by the existing gas water heating system, the consumption of gas is greatly reduced, the hot water in the hot water pipeline 5 is prevented from flowing into the cold water pipeline 6, and the influence of the circulating system on the water purifier in the cold water pipeline 6 is further reduced.
On the other hand, in the present embodiment, the water volume server 4 includes a water volume detecting unit, a water volume controller and a switch valve, and in step S1, referring to fig. 2, the method for obtaining the frequency of controlling the switch valve by the water volume server 4 includes:
step S101, periodically acquiring the water flow speed detected by the water flow detection unit;
step S102, multiplying the detected water flow speed by the detection period to obtain the water flow quantity in the current period;
step S103, judging whether the water flow rate of the current period exceeds a preset water flow rate threshold, if so, controlling the switch valve to be closed, and if not, controlling the switch valve to be opened;
step S104, the operation time and the state of each control switch valve are recorded, and the frequency of the control switch valve of the water volume server 4 is obtained.
The input of the water volume server 4 is the water flow speed detected by the water volume detecting unit, and is generally input into the water volume controller by means of transmitting an electric signal. The water quantity controller can process and analyze the input water flow speed and control the switch of the switch valve by taking a preset water quantity threshold value as a standard. The output of the water quantity servo 4 is a switch signal for controlling a switch valve, and the purpose of controlling the water flow is realized by controlling the switch of the switch valve.
Alternatively, the water amount detection unit may be a water amount sensor, a flow meter, a pressure sensor, a liquid level sensor, or the like, which is not limited in this embodiment.
In this embodiment, the operation time and state of each control valve are transmitted to the main controller 8 through the water volume server 4, and data is provided for the frequency of the control valve of the water volume server 4 calculated by the main controller 8. Meanwhile, the frequency of the control switch valve is dynamically adjusted according to the water quantity change condition in the water heater, so that a better control effect is achieved, and water resources are saved.
Optionally, after the master controller 8 records the operation time and state of each control switch valve, the frequency of the water volume server 4 controlling the switch valve can be obtained by calculating the time interval of each control switch valve, which comprises the following specific steps:
screening out operation records of all water quantity servo 4 for controlling the switch valve from the records, wherein the operation records comprise the opening and closing of the switch valve;
sequencing according to the operation time of the control switch valve, and calculating the time interval between two adjacent operation times, namely the time interval from the last valve closing to the next valve closing or the time interval from the last valve opening to the next valve opening;
adding all time intervals, and dividing the time intervals by a value obtained by subtracting one from the operation times to obtain an average time interval;
the frequency at which the water volume server 4 controls the on-off valve is equal to the number of operations per second, i.e. the inverse of the average time interval.
For example, assuming that there are 5 operations of opening and closing the valve in the record, the operation times are t1, t2, t3, t4, t5, respectively, then the time intervals are t2-t1, t3-t2, t4-t3, t5-t4, respectively. The formula for calculating the average time interval is:
average time interval= (t2-t1+t3-t2+t4-t3+t5-t4)/(5-1);
after the average time interval is obtained, the frequency with which the water output server 44 controls the on-off valve can be calculated, i.e., the average time interval is inverted.
On the other hand, in the embodiment, in step S2, the method for calculating the flow average value according to the frequency of controlling the switching valve by the water volume server 4 includes:
according to the frequency of the control switch valve of the water quantity server 4, calculating the water flow quantity in the preset time;
and (5) calculating the average value of the water flow in the preset time to obtain the average value of the water flow.
On the other hand, in this embodiment, the flow rate in the preset time is specifically calculated by the following formula:
wherein Q represents the water flow rate in a preset time, and F represents the frequency of controlling the switch valve by the water flow server 4.
On the other hand, in the present embodiment, the water capacity in the hot water pipe 5 is specifically calculated by the following formula:
wherein C represents the water volume in the hot water pipe 5, L represents the length of the hot water pipe 5, and S represents the cross-sectional area of a standard hot water pipe in a domestic hot water system.
By way of example, standard hot water pipe cross-sectional area in a domestic hot water system is typically determined by the diameter of the pipe, a typical hot water pipe diameter being 3/4 inch, and a standard pipe cross-sectional area for a 3/4 inch hot water pipe being 1.77 square centimeters (approximately equal to 0.274 square inches).
On the other hand, in the present embodiment, in step S5, the method for performing cyclic heating by the main controller 8 according to the optimal cyclic heating time includes:
the main controller 8 controls the water pump assembly 7 to start and controls the water pump assembly 7 to run in the optimal cyclic heating time;
after the optimal cyclic heating time is over, the main controller 8 controls the water pump assembly 7 to stop running.
When the water pump assembly 7 stops running, the internal circulation state of the water heater is stopped, and because the circulation heating is only carried out in the calculated optimal circulation heating time, when the optimal circulation heating time is finished, the hot water in the hot water pipeline 5 in front of the one-way valve 3 is just hot water, so-called zero cold water is realized, the one-way valve 3 has the function of preventing the cold water from flowing backwards, and in the state that the internal circulation state is stopped, the cold water cannot enter the hot water pipeline 5 and the hot water cannot enter the cold water pipeline 6, the quantitative circulation heating through the gas hot water system is realized, the hot water in the hot water pipeline 5 is prevented from flowing into the cold water pipeline 6, and the influence of the circulation system on the water purifier in the cold water pipeline 6 is further reduced. Meanwhile, the water pump is stopped, so that the gas water heater can not operate, and the consumption of gas is reduced.
On the other hand, in this embodiment, the hot water pipe 5 is provided with a water temperature detecting unit, referring to fig. 3, in step S5, the method for executing cyclic heating by the main controller 8 according to the optimal cyclic heating time further includes:
step S501, a water temperature detection unit periodically detects the water flow temperature in the hot water pipeline 5;
in step S502, when the water flow temperature is higher than the preset temperature threshold, the main controller 8 maintains the current operation state of the water pump assembly 7, and when the water flow temperature is lower than the preset temperature threshold, the main controller 8 performs the following steps:
step S503, the main controller 8 controls the water pump assembly 7 to start, and controls the water pump assembly 7 to run in the optimal cyclic heating time;
in step S504, after the optimal cyclic heating time is over, the main controller 8 controls the water pump assembly 7 to stop running.
By periodically detecting the water flow temperature in the hot water pipeline 5, when the water flow temperature is lower than a preset temperature threshold, namely when hot water (for example, 40 ℃) is cooled to cold water (for example, 20 ℃), quantitative circulation heating of the gas water heating system is executed, so that the operation times of the gas water heater in an internal circulation state are reduced while the water temperature in the hot water pipeline 5 is ensured, and the consumption of gas is greatly reduced.
A gas water heating system for performing a control method of a gas water heating system as described above, comprising:
the gas water heater comprises a water pump assembly 7, a water quantity server 4 and a main controller 8, wherein the water pump assembly 7 is used for providing power for the circulation heating of the gas water heater, the water quantity server 4 is used for detecting the water flow speed and adjusting the water flow quantity, and the water pump assembly 7 and the water quantity server 4 are electrically connected with the main controller 8;
the hot water pipeline 5 and the cold water pipeline 6 are communicated with the water outlet 2 of the gas water heater, and the cold water pipeline 6 is communicated with the water inlet 1 of the gas water heater;
a one-way valve 3 is communicated between the hot water pipeline 5 and the cold water pipeline 6 to form a circulating waterway.
The schematic structure of the gas water heating system according to this embodiment is shown in fig. 4, wherein the water pump assembly 7- > C- > D is a hot water pipeline 5, the a- > E pipeline is a cold water pipeline 6, and the a- > B- > C- > D- > check valve 3- > E- > a- > B is a circulating water path. The schematic diagram of the internal structure of the gas water heater is shown in fig. 5.
On the other hand, in this embodiment, the hot water pipe 5 is provided with a water temperature detecting unit, and the water temperature detecting unit is used for detecting the water flow temperature in the hot water pipe 5.
On the other hand, in this embodiment, the gas water heater further includes a display screen connected to the main controller 8, and a zero cold water function key is disposed on the display screen.
The following describes a specific operation flow of a control method of a gas water heating system according to the present embodiment:
after the after-sales master installs the gas water heater for the first time in the user's home, the gas water heater is powered on, the pressure sensor detects the original pressure P1 (for example, 0.206 Mpa) in the pipeline, and the data P1 is transmitted to the main controller 8;
after sales master starts to operate the gas water heater to identify the length of the hot water pipeline 5, presses a zero cold water function key on the display screen, starts a zero cold water function, and operates the water pump assembly 7;
the pressure sensor detects the pressure P2 (for example, 0.26 Mpa) in the pipeline after the water pump assembly 7 is started, and the data P2 is transmitted to the main controller 8 to obtain the pressure difference delta P=0.054 Mpa;
the water pumped by the water pump assembly 7 passes through the water volume server 4, and the frequency F (for example, 33.45 HZ) of the control switch valve of the water volume server 4 is obtained;
the main controller 8 receives the frequency F of the switching valve controlled by the water quantity server 4, and calculates the water flow quantity Q= (33.45+3)/8.1=4.5L/min according to a formula;
the main controller 8 calculates the average value of the calculated water flow Q, and matches with an actual measurement database stored in the main controller 8 in advance, and recognizes that the length of the hot water pipeline 5 is 20m;
the length of the hot water pipeline 5 is identified, and the main controller 8 transmits a signal to the display to prompt the display to identify completion;
the main controller 8 calculates the optimal cyclic heating time according to the length 20m of the hot water pipeline 5;
after-sales master lightly touches the power switch key to confirm that the task of recognizing the length of the hot water pipeline 5 by the main controller 8 is completed;
formally using the zero cold water function state, after-sales master presses the zero cold water function key on the display screen again to start the zero cold water function, and then, in the state of internal circulation of the gas hot water system, the main controller 8 executes circulation heating according to the optimal circulation heating time to realize the zero cold water function.
While the application has been described in terms of embodiments, it will be appreciated by those skilled in the art that the application is not limited thereto but rather includes the drawings and the description of the embodiments above. Any modifications which do not depart from the functional and structural principles of the present application are intended to be included within the scope of the appended claims.
Claims (9)
1. The control method of the gas water heating system is suitable for the gas water heating system comprising a hot water pipeline, a cold water pipeline, a one-way valve and a gas water heater, wherein the gas water heater comprises a water pump assembly, a water volume server and a main controller, and is characterized by comprising the following steps:
step S1, starting a water pump assembly to obtain the frequency of a water quantity servo control switch valve;
s2, calculating a flow average value according to the frequency of a control switch valve of the water quantity server;
step S3, matching the calculated average value of the flow quantity with an actual measurement database stored in the main controller in advance, and identifying the length of a hot water pipeline;
step S4, calculating the water capacity of the hot water pipeline according to the length of the hot water pipeline;
step S5, dividing the water capacity of the hot water pipeline by the average value of the water flow quantity to obtain the optimal circulating heating time;
and S6, the main controller executes cyclic heating according to the optimal cyclic heating time.
2. A control method of a gas water heating system according to claim 1, wherein,
the water volume server comprises a water volume detection unit, a water volume controller and a switch valve, and in the step S1, the method for obtaining the frequency of the water volume server for controlling the switch valve comprises the following steps:
periodically acquiring the water flow speed detected by the water flow detection unit;
multiplying the detected water flow speed by the detection period to obtain the water flow quantity of the current period;
judging whether the water flow rate of the current period exceeds a preset water flow rate threshold value, if so, controlling the switch valve to be closed, and if not, controlling the switch valve to be opened;
and recording the operation time and state of the control switch valve each time to obtain the frequency of the control switch valve of the water quantity server.
3. A control method of a gas water heating system according to claim 1, wherein,
in step S2, the method for calculating the average value of the flow rate according to the frequency of the control switch valve of the water flow server includes:
calculating the water flow in a preset time according to the frequency of a control switch valve of the water flow server;
and solving an average value of the water flow in the preset time to obtain an average value of the water flow.
4. A control method of a gas water heating system according to claim 3, wherein,
the water flow rate in the preset time is calculated specifically by the following formula:
wherein Q represents the water flow in the preset time, and F represents the frequency of the water flow servo control switch valve.
5. A control method of a gas water heating system according to claim 1, wherein,
the water capacity in the hot water pipeline is specifically calculated by the following formula:
wherein C represents the water capacity in the hot water pipeline, L represents the length of the hot water pipeline, and S represents the cross-sectional area of a standard hot water pipeline in the household hot water system.
6. A control method of a gas water heating system according to claim 1, wherein,
in step S5, the method for executing the cyclic heating by the main controller according to the optimal cyclic heating time includes:
the main controller controls the water pump assembly to start and controls the water pump assembly to run in the optimal cyclic heating time;
and after the optimal cyclic heating time is over, the main controller controls the water pump assembly to stop running.
7. A control method of a gas water heating system as claimed in claim 6, wherein,
in step S5, the method for executing the cyclic heating by the main controller according to the optimal cyclic heating time further includes:
the water temperature detection unit periodically detects the water flow temperature in the hot water pipeline;
when the water flow temperature is higher than a preset temperature threshold value, the main controller maintains the running state of the current water pump assembly, and when the water flow temperature is lower than the preset temperature threshold value, the main controller executes the following steps:
the main controller controls the water pump assembly to start and controls the water pump assembly to run in the optimal cyclic heating time;
and after the optimal cyclic heating time is over, the main controller controls the water pump assembly to stop running.
8. A gas water heating system for performing a control method of a gas water heating system as claimed in any one of claims 1 to 7, comprising:
the gas water heater comprises a water pump assembly, a water quantity server and a main controller, wherein the water pump assembly is used for providing power for the circulation heating of the gas water heater, the water quantity server is used for detecting the water flow speed and adjusting the water flow quantity, and the water pump assembly and the water quantity server are electrically connected with the main controller;
the hot water pipeline is communicated with the water outlet of the gas water heater, and the cold water pipeline is communicated with the water inlet of the gas water heater;
a one-way valve is communicated between the hot water pipeline and the cold water pipeline to form a circulating waterway.
9. A gas fired hot water system as claimed in claim 8, wherein,
the hot water pipeline is provided with a water temperature detection unit, and the water temperature detection unit is used for detecting the water flow temperature in the hot water pipeline.
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