CN115711491A - Control method of zero-cold-water gas water heater - Google Patents
Control method of zero-cold-water gas water heater Download PDFInfo
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- CN115711491A CN115711491A CN202211353626.1A CN202211353626A CN115711491A CN 115711491 A CN115711491 A CN 115711491A CN 202211353626 A CN202211353626 A CN 202211353626A CN 115711491 A CN115711491 A CN 115711491A
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Abstract
The invention discloses a control method of a zero-cold-water gas water heater, which comprises a receiving single circulation mode, a inching circulation mode, a timing circulation mode, a pressurization mode and an anti-freezing mode. The invention can also pump the water in the water return pipeline back to the gas water heater by starting the water pump, heat and recycle the water back to the recovery pipeline, realize the circular heating, the controller judges whether to stop the water pump or not and whether to finish the circulation or not according to the temperature of the water outlet temperature probe, the temperature of the water return temperature probe and the continuous operation time of the water pump, thus balancing the water temperature in the pipeline and avoiding the problems of high water temperature of a water-saving pipe and low water temperature in a water-saving pipe in the pipeline.
Description
Technical Field
The invention relates to the technical field of gas water heaters, in particular to a control method for a zero-cold-water gas water heater.
Background
Compared with a general electric water heater, the zero-cold-water gas water heater has multiple advantages, such as: firstly, the zero-cold-water gas water heater is internally provided with an integrated centrifugal water pump, so that the installation is more attractive and elegant; and secondly, the zero-cold-water gas water heater can use hot water at any time and any place, and the water stop valve can be opened to use the hot water, so that the zero-cold-water gas water heater is very convenient and fast, convenient and the like. The zero-cold water gas water heater is a trend in the water heater industry because the zero-cold water gas water heater can realize the effect of instant hot water on-off, but the minimum load of the zero-cold water gas water heater in the current market is made to be larger due to the reasons of cost and the like, so that when the zero-cold water circulation function is executed by the gas water heater, the phenomenon that water is boiled due to excessive overshoot is possibly caused, the water temperature in a pipeline is unstable, and a water saving pipe is cold, a water saving pipe is hot or water at a remote water using point is not hot.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides a control method which can be used for pumping water in a water return pipeline back into a gas water heater by starting a water pump, heating the water and then recycling the water back to a recycling pipeline, realizing circular heating, judging whether the water pump needs to be stopped or not by a controller through the temperature of an outlet water temperature probe, the temperature of a return water temperature probe and the continuous running time of the water pump, judging whether the circulation is finished or not, balancing the water temperature in a pipeline, and avoiding the high water temperature of a water-saving pipe and the low water temperature of the water-saving pipe in the pipeline.
In order to solve the technical problem, the invention provides a control method of a zero-cold-water gas water heater,
the gas water heater is internally provided with a water pump, a main water path, a controller and a gas control valve, the water pump is installed on the main water path of the gas water heater, the water pump and the gas control valve are respectively electrically connected with the controller, the gas control valve is installed on a gas supply path of the gas water heater, the gas control valve is used for controlling the opening and the on-off of gas, the main water path comprises a water inlet pipeline, a water outlet pipeline and a water return pipeline, the water inlet pipeline, the water outlet pipeline and the water return pipeline are sequentially connected to form a circulation pipeline, the gas water heater adopts the following control method to realize circulation, and the control method comprises the following steps:
step S1: if the gas water heater receives the single circulation instruction, the step S4 is carried out; if the gas water heater receives the inching cycle instruction, the step S2 is carried out; if the gas water heater receives the timing cycle instruction, the step S3 is carried out;
step S2: the gas water heater operates according to a single circulation mode according to a single circulation instruction;
and step S3: the gas water heater operates according to a timing cycle instruction and a timing cycle mode;
and step S4: the water pump is started softly, and the step S5 is carried out;
step S5: detecting a water flow signal by a water flow sensor, and entering step S6;
step S6: judging a water flow signal detected by a water flow sensor, determining whether water flow exists to meet the starting condition of the gas water heater, if the water flow signal exists, determining that the starting condition of the gas water heater is met, starting the gas water heater to act, and entering step S7; if no water flow signal is detected, judging whether the time for reaching the water flow signal detection is met, if the time for reaching the water flow signal detection is determined, determining that the water pump is abnormal, and sending a water pump fault alarm; if the water flow detection time is determined not to be reached, returning to the step S5;
step S7: detecting whether the fan is blocked before cleaning, if so, determining that the fan is abnormal, and sending a fan blockage fault alarm; if the blockage is determined not to exist, the controller opens the gas control valve to ventilate, burn and heat, the gas water heater enters an ignition state, and the step S8 is executed;
step S8:0.5S, closing the rear main valve, and entering the step S9;
step S9: closing a gas proportional valve of the gas pipeline after 0.5S, and entering a step S10;
step S10: detecting whether a flame signal of combustion of the gas water heater exists, and if the flame signal of combustion of the gas water heater exists, carrying out air distribution and constant temperature control by the controller according to a zero cold water mode; if no flame signal of combustion of the gas water heater is detected, the step S11 is carried out;
step S11: judging whether the number of times of twice ignition is met, if so, sending an ignition fault alarm, and if not, returning to the step S10;
step S12: during air distribution and constant temperature control, detecting the operation time T0 of the water pump, judging whether the operation time T0 of the water pump is greater than the maximum operation time Tl of the water pump, and stopping the operation of the water pump if the operation time T0 of the water pump is determined to be greater than the maximum operation time Tl of the water pump; if the operation time T0 of the water pump is not greater than the maximum operation time Tl of the water pump, the water pump continues to operate;
step S13: when air distribution and constant temperature control are carried out, the water outlet temperature sensing probe and the water return temperature sensing probe can detect the water temperature and the water return temperature, and the detected water outlet temperature T is judged Go out Whether it is higher than the temperature T set by the controller Stator The minimum number of fire of the gas water heater is 25/the current water flow/2, if the detected outlet water temperature T is determined Go out Is greater than the temperature T set by the controller Stator If the minimum fire number of the gas water heater is 25/current water flow/2, the gas water heater is switched off, but the water pump is not switched off, and the water pump continues to operate for n seconds; judging whether the detected return water temperature is greater than the set temperature T Stator -when the minimum number of fire is 25/current water flow of the gas water heater, if the detected return water temperature is determined to be greater than the set temperature T Stator And when the minimum fire number of the gas water heater is 25 per current water flow, turning off the gas water heater, but not turning off the water pump, continuously operating the water pump for n seconds, and turning off the water pump to finish the circulation if the detected outlet water temperature and return water temperature cannot reach the starting conditions.
As a further improvement of the above technical solution, the single cycle mode in step S2 operates according to the following specific steps:
step S21: judging whether the gas water heater is in a standby state, and if the gas water heater is in the standby state, entering a step S22;
step S22: judging whether the standby time of the gas water heater exceeds 8 seconds, and if the standby time of the gas water heater exceeds 8 seconds, entering a step S23; if the standby time of the gas water heater is determined not to exceed 8 seconds, returning to the step S21;
step S23: detecting whether the current water flow in unit time in the water inlet pipeline and the water outlet pipeline is 0 or not, and if so, determining that the current water flow in unit time in the water pipeline is 0; if the current water flow in the water inlet and outlet pipelines in unit time is determined to be 0, judging whether the water flow in the water inlet and outlet pipelines detected in 6S is changed from Q to 0 twice, and if the water flow in the water inlet and outlet pipelines detected in 6S is changed from Q to 0 twice, entering step S3; and if the current water flow in the water inlet and outlet pipeline in unit time is determined not to satisfy twice change from Q to 0, returning to the step S22.
As a further improvement of the above technical solution, the timing cycle mode in step S3 operates according to the following specific steps:
step S31: acquiring the standard time TC from the far end, and entering the step S32;
step S32: acquiring starting time T0 for starting the water pump at regular time, and entering step S33;
step S33: acquiring the time T1 of the operation end of the water pump, and entering step S34;
step S34: judging whether T1< = T0 is met, if yes, entering step S35, and if not, entering step S36;
step S35: judging whether T1= T1+24 or not, and if yes, entering step S36;
step S36: judging whether TC > = T0 is met, if yes, entering step S37, and if not, returning to step S34;
step S37: judging whether the outlet water temperature is less than the temperature T set by the controller Stator -4, if yes, proceeding to step S4; if not, the step S39 is executed;
step S38: judging whether the return water temperature is less than the temperature T set by the controller Stator -8, if the determination is yes, proceeding to step S4; if not, the process returns to step S37.
As a further improvement of the above technical solution, the control method of the gas water heater further includes receiving an operation instruction of a pressurization mode, where the pressurization mode is operated according to the following specific steps:
starting the pressurization function of the gas water heater in a standby state, and recording an initial water flow value;
the water flow sensor detects water flow signals, judges whether the water flow signals are detected or not, if the water flow signals are detected, the water flow sensor continues to detect the water flow signals, if the water flow signals are detected, judges whether the water flow is less than 5L or not, if the water flow is determined to be less than 5L, the condition that the water heater is started is determined to be met, and the water heater is started to act; if the water flow is determined not to be satisfied to be less than 5L, continuously returning to judge whether the water flow is satisfied to be less than 5L;
calculating the temperature T set by the controller of the gas water heater after the water pump is started Stator Lower maximum water flow rate Qmax;
and controlling the rotation speed of the water pump by taking Qmax as a target water flow;
when the water flow is judged to be reduced by 50% in 1S, if the water flow is not determined to be reduced by 50%, continuously controlling the rotation speed of the water pump by taking Qmax as a target water flow; if yes, the water pump is turned off, and the supercharging mode is exited.
As a further improvement of the above technical solution, the control method of the gas water heater further comprises receiving an operation instruction of an anti-freeze mode, wherein the anti-freeze mode is operated according to the following specific steps:
detecting the temperature in a return water pipeline of the gas water heater in a standby state;
entering an anti-freezing mode when the detected temperature in the water return pipeline is lower than the starting temperature;
judging whether the standby time of the gas water heater exceeds 30 minutes, if so, judging whether the return water temperature meets < 2 ℃, if not, judging whether the return water temperature meets < 2 ℃, if so, judging whether the return water temperature meets < 6 ℃, and if so, setting the return water temperature of the gas water heater to be 30 ℃, starting the gas water heater to execute a single-cycle, and withdrawing the gas water heater from the anti-freezing mode; if the backwater temperature is determined not to meet the requirement of less than 6 ℃, returning to continuously judge whether the backwater temperature meets the requirement of less than 2 ℃; if the backwater temperature is determined to be less than 2 ℃, when the backwater temperature of the gas water heater is set to be 35 ℃, the gas water heater is started to execute a single cycle, and the gas water heater exits the anti-freezing mode.
As a further improvement of the technical scheme, a circulating pipeline formed by the water inlet pipeline, the water outlet pipeline and the water return pipeline is used for circulating heating of the gas water heater.
As a further improvement of the above technical scheme, a water outlet temperature probe is installed at the water outlet end of the main water path, the water outlet temperature probe is used for monitoring the water outlet temperature of the water outlet end of the main water path of the gas water heater in real time, a water return temperature probe is installed at the water inlet end of the main water path, the water return temperature probe is used for monitoring the water return temperature of the water inlet end of the main water path of the gas water heater in real time, and the water outlet temperature probe and the water return temperature probe are respectively and electrically connected with the controller.
As a further improvement of the technical scheme, a water flow sensor is installed on the main water path and used for detecting water flow signals of the main water path.
As a further improvement of the technical scheme, the fire detection needle is arranged in the gas water heater and used for detecting whether flame exists or not.
Compared with the prior art, the scheme of the invention at least comprises the following beneficial effects:
(1) The gas water heater of the invention firstly starts the water pump, secondly pumps water in the water return pipeline back to the gas water heater through the water pump, then ignites and heats through starting the gas control valve, and finally circulates hot water to the water return pipeline through the water outlet pipeline to finish the circular heating of the gas water heater.
(2) The control method of the gas water heater comprises the steps of receiving a timing cycle instruction, determining the water using time period of a user according to the timing cycle instruction by acquiring the running timing time and the running ending time of the gas water heater set by the user, and determining the heating time period of the water heater, so that the user can use hot water at any time, the water in a water outlet pipeline can be prevented from being heated for a long time, the waste of the hot water is avoided, and the utilization rate of the hot water is improved.
(3) When air distribution and constant temperature control are carried out, the temperature and the return water temperature can be detected by the water outlet temperature sensing probe and the return water temperature sensing probe, whether the detected water outlet temperature T is greater than the temperature T set by the controller and the minimum fire number of the gas water heater, 25/current water flow/2 or not is judged, if the detected water outlet temperature T is greater than the temperature T set by the controller and the minimum fire number of the gas water heater, 25/current water flow/2, the gas water heater is switched off, but the water pump is not switched off, and the water pump continues to operate for n seconds; and judging whether the detected backwater temperature is greater than the set temperature Tset-minimum fire number of the gas water heater multiplied by 25/current water flow, if the detected backwater temperature is greater than the set temperature Tset-minimum fire number of the gas water heater multiplied by 25/current water flow, turning off the fire of the gas water heater, but not turning off the water pump, and continuously operating the water pump for n seconds. The invention detects the temperature of water and the temperature of return water through the temperature of the water outlet temperature probe and the temperature of the return water, judges the water outlet temperature and the temperature of the return water, and judges whether to stop the water pump and whether to complete circulation when judging whether to reach the starting condition of the water pump.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a schematic view of a gas water heater of the present invention;
FIG. 2 is a flow chart of the operation of the gas water heater of the present invention in a single cycle mode;
FIG. 3 is a flow chart of the operation of the gas water heater of the present invention in a click cycle mode;
FIG. 4 is a flow chart of the operation of the gas water heater of the present invention in a timed cycle mode;
FIG. 5 is a flow chart of the operation of the gas water heater of the present invention in the boost mode;
fig. 6 is a flow chart of the operation of the gas water heater of the present invention in the freeze protection mode.
In the figure, the gas water heater 1, the water pump 2, the main water channel 3, the water inlet pipeline 31, the water outlet pipeline 32, the water return pipeline 33, the water flow sensor 34, the water outlet temperature probe 35, the water return temperature probe 36, the controller 4, the gas control valve 5 and the water heater 6 are shown.
Detailed Description
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 making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1-6, in an embodiment of the present invention, a control method of a zero-cold-water gas water heater 1 is provided, in which a water pump 2, a main water path 3, a controller 4, and a gas control valve 5 are provided inside the gas water heater 1, the water pump 2 is installed on the main water path 3 of the gas water heater 1, the water pump 2 and the gas control valve 5 are respectively electrically connected to the controller 4, the gas control valve 5 is installed on an air supply path of the gas water heater 1, the gas control valve 5 is used for controlling the opening and closing of gas, the main water path 3 includes a water inlet pipe 31, a water outlet pipe 32, and a water return pipe 33, the water inlet pipe 31, the water outlet pipe 32, and the water return pipe 33 are sequentially connected to form a circulation pipe, the gas water heater 1 first starts the water pump 2, then pumps water in the water return pipe 33 into the gas water heater 1 through the water pump 2, then starts the gas control valve 5 to ignite and heat, and finally circulates hot water to the water return pipe 33 through the water outlet pipe 32 to complete circulation heating of the gas water heater 1, the circulation heating is achieved by using the following control method:
step S1: if the gas water heater 1 receives the single-cycle instruction, the step S4 is carried out; if the gas water heater 1 receives the inching cycle instruction, the step S2 is carried out; if the gas water heater 1 receives the timing cycle instruction, the step S3 is carried out;
step S2: the gas water heater 1 operates according to a single circulation mode according to a single circulation instruction;
in step S2, the single circulation mode is operated according to the following specific steps:
step S21: judging whether the gas water heater 1 is in a standby state, and if the gas water heater 1 is in the standby state, entering step S22;
step S22: judging whether the standby time of the gas water heater 1 exceeds 8 seconds, and if the standby time of the gas water heater 1 is determined to exceed 8 seconds, entering a step S23; if the standby time of the gas water heater 1 is determined not to exceed 8 seconds, returning to the step S21;
step S23: detecting whether the current water flow in the water inlet pipeline 32 and the water outlet pipeline 32 per unit time is 0 or not, and if so, determining that the current water flow in the water outlet pipeline 32 per unit time is 0; if the current water flow in the water inlet and outlet pipeline 32 in unit time is determined to be 0, judging whether the water flow in the water inlet and outlet pipeline 32 is detected to be changed from Q to 0 twice in 6S, and if the water flow in the water inlet and outlet pipeline 32 is detected to be changed from Q to 0 twice in 6S, entering the step S3; if it is determined that the current water flow rate of the water inlet and outlet pipelines 32 in unit time does not satisfy twice Q-to-0, the operation returns to step S22, the gas water heater 1 of the present invention detects and judges the water flow rate according to the water flow rate detected in the operation process of the inching circulation mode, and regarding the situation that the water flow rate twice Q-to-0, as shown in a square wave waveform diagram displayed in the operation flow diagram of the inching circulation mode in FIG. 3, wherein the water flow rate is from 0- - > Q- - > 0.
And step S3: the gas water heater 1 operates according to a timing cycle instruction and a timing cycle mode;
step S31: acquiring standard time TC from a far end, and entering step S32;
step S32: acquiring the starting time T0 for starting the water pump 2 at fixed time, and entering step S33;
step S33: acquiring the time T1 when the operation of the water pump 2 is finished, and entering step S34;
step S34: judging whether T1< = T0 is met, if yes, entering step S35, and if not, entering step S36;
step S35: judging whether T1= T1+24 or not, and if yes, entering step S36;
step S36: judging whether TC > = T0 is met, if yes, entering step S37, and if not, returning to step S34;
step S37: judging whether the outlet water temperature is less than the temperature T set by the controller 4 Stator -4, if yes, proceeding to step S4; if not, the step S39 is executed;
step S38: judging whether the backwater temperature is less than the temperature T set by the controller 4 Stator -8, if yes, proceeding to step S4; if not, returning to the step S37;
and step S4: the water pump 2 is softly started, and the step S5 is entered;
step S5: the water flow sensor 34 detects a water flow signal, and the process proceeds to step S6;
step S6: judging a water flow signal detected by the water flow sensor 34, determining whether water flow exists to meet the starting condition of the gas water heater 1, if the water flow signal exists, determining that the starting condition of the gas water heater 1 is met, starting the gas water heater 1 to act, and entering step S7; if no water flow signal is detected, judging whether the time for reaching the water flow signal detection is met, if the time for reaching the water flow signal detection is determined, determining that the water pump 2 is abnormal, and sending a fault alarm of the water pump 2; if the water flow detection time is determined not to be reached, returning to the step S5;
step S7: detecting whether the fan is blocked before cleaning, if so, determining that the fan is abnormal, and sending a fan blockage fault alarm; if the blockage is determined not to exist, the controller 4 opens the gas control valve 5 to ventilate, burn and heat, the gas water heater 1 enters an ignition state, and the step S8 is carried out;
step S8:0.5S, closing the main valve, and entering the step S9;
step S9: closing a gas proportional valve of the gas pipeline after 0.5S, and entering a step S10;
step S10: detecting whether a flame signal of the gas water heater 1 is generated, and if the flame signal of the gas water heater 1 is detected, carrying out air distribution and constant temperature control by the controller 4 according to a zero cold water mode; if no flame signal of the combustion of the gas water heater 1 is detected, the step S11 is executed;
step S11: judging whether the number of times of twice ignition is met, if so, sending an ignition fault alarm, and if not, returning to the step S10;
step S12: during air distribution and constant temperature control, detecting the running time T0 of the water pump 2, judging whether the running time T0 of the water pump 2 is greater than the maximum running time Tl of the water pump 2, and stopping the running of the water pump 2 if the running time T0 of the water pump 2 is determined to be greater than the maximum running time Tl of the water pump 2; if the operation time T0 of the water pump 2 is not greater than the maximum operation time Tl of the water pump 2, the water pump 2 continues to operate;
step S13: when air distribution and constant temperature control are carried out, the water outlet temperature-sensing probe and the water return temperature-sensing probe can detect the temperature of water and the temperature of water return, and the detected water outlet temperature T is judged Go out Whether or not it is higher than the set temperature T of the controller 4 Stator + 1 minimum number of fire 25/current water flow/2 of gas water heater, if the detected water outlet is determinedTemperature T Go out Is greater than the set temperature T of the controller 4 Stator + the minimum fire number of the gas water heater 1 is 25/current water flow/2, the gas water heater 1 is turned off, but the water pump 2 is not closed, and the water pump 2 continues to operate for n seconds; judging whether the detected return water temperature is greater than the set temperature T Stator -when the gas water heater 1 has the minimum number of fire x 25/current water flow, if the detected return water temperature is determined to be greater than the set temperature T Stator 1 minimum number of fire x 25/current water flow of gas water heater, wherein T Go out The outlet water temperature T of the outlet pipe Stator And if the temperature is set for the controller 4, the gas water heater 1 is turned off, but the water pump 2 is not turned off, the water pump 2 continues to operate for n seconds, and if the detected outlet water temperature and return water temperature can not reach the starting condition, the water pump 2 is turned off, and the cycle is ended.
In the specific implementation of the present invention, the control method of the gas water heater 1 further includes receiving an operation instruction of a pressurization mode, wherein the pressurization mode is operated according to the following specific steps:
starting the pressurization function of the gas water heater 1 in a standby state, and recording an initial water flow value;
the water flow sensor 34 detects water flow signals, judges whether the water flow signals are detected or not, if no water flow signals are detected, the water flow sensor 34 continues to detect the water flow signals, if the water flow signals are detected, judges whether the water flow is less than 5L or not, if the water flow is less than 5L, the condition that the water heater is started is determined to be reached, and the water heater is started to act; if the water flow is determined not to be satisfied with the flow rate of <5L, continuously returning to judge whether the water flow is satisfied with the flow rate of <5L;
calculating the temperature T set by the controller 4 of the gas water heater 1 after the water pump 2 is turned on Stator The maximum water flow rate Qmax;
controlling the rotating speed of the water pump 2 by taking Qmax as a target;
when judging whether the water flow is reduced by 50% in 1S, if not, continuing to control the rotating speed of the water pump 2 by taking Qmax as a target water flow; if yes, the water pump 2 is turned off, and the supercharging mode is exited.
During the specific implementation of the present invention, the control method of the gas water heater 1 further comprises receiving an operation instruction of an anti-freezing mode, wherein the anti-freezing mode is operated according to the following specific steps:
detecting the temperature in a water return pipeline of the gas water heater 1 in a standby state;
entering an anti-freezing mode when the detected temperature in the water return pipeline is lower than the starting temperature;
judging whether the standby time of the gas water heater 1 exceeds 30 minutes, if yes, judging whether the return water temperature meets < 2 ℃, if the return water temperature does not meet < 2 ℃, judging whether the return water temperature meets < 6 ℃, if the return water temperature meets < 6 ℃, setting the return water temperature of the gas water heater 1 to be 30 ℃, starting the gas water heater 1 to execute a single cycle, and withdrawing the gas water heater 1 from an anti-freezing mode; if the backwater temperature is determined not to meet the requirement of less than 6 ℃, returning to continuously judge whether the backwater temperature meets the requirement of less than 2 ℃; if the backwater temperature is determined to be less than 2 ℃, when the backwater temperature of the gas water heater 1 is set to be 35 ℃, the gas water heater 1 is started to execute a single cycle, and the gas water heater 1 exits the anti-freezing mode.
As shown in fig. 1, in the embodiment of the present invention, when the embodiment of the present invention is implemented specifically, a circulation pipeline formed by a water inlet pipeline 31, a water outlet pipeline 32, and a water return pipeline 33 is used for circularly heating the gas water heater 1, and the water outlet end of the water outlet pipeline 32 is connected to hot water inlets of a plurality of gas water heaters 1 corresponding to users, and hot water in the water outlet pipeline 32 is pumped to the user water heater 6 by the water pump 2, so that when a user opens the water heater 6, constant-temperature hot water flows out, and the present invention is comfortable and convenient. The invention also installs the temperature probe 35 of the outlet water at the outlet end of the main water route 3, the temperature probe 35 of the outlet water is used for monitoring the temperature of the outlet water of the outlet end of the main water route 3 of the gas heater 1 in real time; a return water temperature probe 36 is installed at the water inlet end of the main water path 3, the return water temperature probe 36 is used for monitoring the return water temperature of the water inlet end of the main water path 3 of the gas water heater 1 in real time, the water outlet temperature probe 35 and the return water temperature probe 36 are respectively and electrically connected with the controller 4, and the controller 4 judges whether to stop the water pump 2 or not according to the temperature detected by the water outlet temperature probe 35, the temperature detected by the return water temperature probe 36 and the continuous operation time of the water pump 2, and judges whether to complete the circulation.
The invention also installs a water flow sensor 34 on the main water path 3, the water flow sensor 34 is used for detecting the water flow signal of the main water path 3, and the invention also installs a fire detection needle in the gas water heater 1, the fire detection needle is used for detecting whether there is flame.
In other embodiments of the present invention, the main waterway 3 of the present invention may not use the return pipe 33.
Compared with the prior art, the technical scheme disclosed by the embodiment has the following beneficial effects:
in the above embodiment, the gas water heater 1 of the present invention starts the water pump 2, then pumps the water in the water return pipeline 33 back into the gas water heater 1 through the water pump 2, then ignites and heats by starting the gas control valve 5, and finally circulates the hot water to the water return pipeline 33 through the water outlet pipeline 32 to complete the circulation heating of the gas water heater 1, and the controller 4 determines whether to stop the water pump 2 or not and determines whether to complete the circulation or not according to the temperature of the water outlet temperature probe 35, the temperature of the water return temperature probe 36, and the continuous operation time of the water pump 2, so as to equalize the water temperature in the pipeline, and avoid the high water temperature of a water-saving pipe and the low water temperature of a water-saving pipe in the pipeline.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (9)
1. A control method of a zero-cold-water gas water heater is characterized by comprising the following steps: the gas water heater is internally provided with a water pump, a main water path, a controller and a gas control valve, the water pump is installed on the main water path of the gas water heater, the water pump and the gas control valve are respectively electrically connected with the controller, the gas control valve is installed on a gas supply path of the gas water heater, the gas control valve is used for controlling the opening and the on-off of gas, the main water path comprises a water inlet pipeline, a water outlet pipeline and a water return pipeline, the water inlet pipeline, the water outlet pipeline and the water return pipeline are sequentially connected to form a circulation pipeline, the gas water heater adopts the following control method to realize circulation, and the control method comprises the following steps:
step S1: if the gas water heater receives the single circulation instruction, the step S4 is carried out; if the gas water heater receives the inching cycle instruction, the step S2 is carried out; if the gas water heater receives the timing cycle instruction, the step S3 is carried out;
step S2: the gas water heater operates according to a single circulation mode according to a single circulation instruction;
and step S3: the gas water heater operates according to a timing cycle instruction and a timing cycle mode;
and step S4: the water pump is started softly, and the step S5 is carried out;
step S5: detecting a water flow signal by a water flow sensor, and entering step S6;
step S6: judging a water flow signal detected by a water flow sensor, determining whether water flow exists to meet the starting condition of the gas water heater, if the water flow signal exists, determining that the starting condition of the gas water heater is met, starting the gas water heater to act, and entering step S7; if no water flow signal is detected, judging whether the time for reaching the water flow signal detection is met, if the time for reaching the water flow signal detection is determined, determining that the water pump is abnormal, and sending a water pump fault alarm; if the water flow detection time is determined not to be reached, returning to the step S5;
step S7: detecting whether the fan is blocked before cleaning, if so, determining that the fan is abnormal, and sending a fan blockage fault alarm; if the blockage is determined not to exist, the controller opens the gas control valve to ventilate, burn and heat, the gas water heater enters an ignition state, and the step S8 is executed;
step S8:0.5S, closing the rear main valve, and entering the step S9;
step S9: closing a gas proportional valve of the gas pipeline after 0.5S, and entering a step S10;
step S10: detecting whether a flame signal of combustion of the gas water heater exists, and if the flame signal of combustion of the gas water heater exists, carrying out air distribution and constant temperature control by the controller according to a zero cold water mode; if no flame signal of combustion of the gas water heater is detected, the step S11 is carried out;
step S11: judging whether the number of times of twice ignition is met, if so, sending an ignition fault alarm, and if not, returning to the step S10;
step S12: during air distribution and constant temperature control, detecting the operation time T0 of the water pump, judging whether the operation time T0 of the water pump is greater than the maximum operation time Tl of the water pump, and stopping the operation of the water pump if the operation time T0 of the water pump is determined to be greater than the maximum operation time Tl of the water pump; if the water pump operation time T0 is not larger than the maximum operation time Tl of the water pump, the water pump continues to operate;
step S13: when air distribution and constant temperature control are carried out, the water outlet temperature sensing probe and the water return temperature sensing probe can detect the water temperature and the water return temperature, and the detected water outlet temperature T is judged Go out Whether it is higher than the temperature T set by the controller Stator + minimum fire number of gas water heater 25/current water flow/2, if the detected water outlet temperature T is determined Go out Is greater than the temperature T set by the controller Stator If the minimum fire number of the gas water heater is 25/current water flow/2, the gas water heater is switched off, but the water pump is not switched off, and the water pump continues to operate for n seconds; judging whether the detected return water temperature is greater than the set temperature T Stator -when the minimum number of fire of gas water heater is 25/current water flow, if it is determined that the detected backwater temperature is greater than the set temperature T Stator When the minimum fire number of the gas water heater is 25/the current water flow, the gas water heater is turned off, but the water pump is not turned off, the water pump continues to operate for n seconds, and if the detected outlet water temperature and return water temperature can not reach the starting condition, the water pump is turned off, and the circulation is finished.
2. The control method of the zero-cold-water gas water heater according to claim 1, characterized in that: the single cycle mode in step S2 operates as follows:
step S21: judging whether the gas water heater is in a standby state or not, and if the gas water heater is in the standby state, entering the step S22;
step S22: judging whether the standby time of the gas water heater exceeds 8 seconds, and if the standby time of the gas water heater exceeds 8 seconds, entering a step S23; if the standby time of the gas water heater is determined not to exceed 8 seconds, returning to the step S21;
step S23: detecting whether the current water flow in unit time in the water inlet pipeline and the water outlet pipeline is 0 or not, and if so, determining that the current water flow in unit time in the water pipeline is 0; if the current water flow in the water inlet and outlet pipelines in unit time is determined to be 0, judging whether the water flow in the water inlet and outlet pipelines detected in 6S is changed from Q to 0 twice, and if the water flow in the water inlet and outlet pipelines detected in 6S is changed from Q to 0 twice, entering step S3; and if the current water flow in the water inlet and outlet pipelines in unit time is determined not to satisfy twice, changing Q into 0, returning to the step S22.
3. The control method of the zero-cold-water gas water heater according to claim 1, characterized in that: the timing cycle mode in step S3 operates according to the following specific steps:
step S31: acquiring standard time TC from a far end, and entering step S32;
step S32: acquiring the starting time T0 of the timing start of the water pump, and entering step S33;
step S33: acquiring the time T1 of the operation completion of the water pump, and entering step S34;
step S34: judging whether T1< = T0 is met, if yes, entering step S35, and if not, entering step S36;
step S35: judging whether T1= T1+24 is met, and if yes, entering step S36;
step S36: judging whether TC > = T0 is met, if yes, entering step S37, and if not, returning to step S34;
step S37: judging whether the outlet water temperature is less than the temperature T set by the controller Stator -4, if yes, proceeding to step S4; if not, the step S39 is executed;
step S38: judging whether the return water temperature is less than the temperature T set by the controller Stator -8, if yes, proceeding to step S4; if not, returningAnd step S37.
4. The control method of the zero-cold water gas water heater according to claim 1, wherein: the control method of the gas water heater also comprises the step of receiving an operation instruction of a pressurization mode, wherein the pressurization mode is operated according to the following specific steps:
starting the pressurization function of the gas water heater in a standby state, and recording an initial water flow value;
the water flow sensor detects water flow signals, judges whether the water flow signals are detected or not, if no water flow signals are detected, the water flow sensor continues to detect the water flow signals, if the water flow signals are detected, judges whether the water flow is less than 5L or not, if the water flow is less than 5L, the condition that the water heater is started is determined, and the water heater is started to act; if the water flow is determined not to be satisfied with the flow rate of <5L, continuously returning to judge whether the water flow is satisfied with the flow rate of <5L;
calculating the temperature T set by the controller of the gas water heater after the water pump is started Stator Lower maximum water flow rate Qmax;
and controlling the rotation speed of the water pump by taking Qmax as a target water flow;
when the water flow is judged to be reduced by 50% in 1S, if the water flow is not determined to be reduced by 50%, continuing to control the rotating speed of the water pump by taking Qmax as a target; if yes, the water pump is turned off, and the supercharging mode is exited.
5. The control method of the zero-cold-water gas water heater according to claim 1, characterized in that: the control method of the gas water heater further comprises the step of receiving an operation instruction of an anti-freezing mode, wherein the anti-freezing mode is operated according to the following specific steps:
detecting the temperature in a return water pipeline of the gas water heater in a standby state;
entering an anti-freezing mode when the detected temperature in the water return pipeline is lower than the starting temperature;
judging whether the standby time of the gas water heater exceeds 30 minutes, if so, judging whether the return water temperature meets < 2 ℃, if the return water temperature does not meet < 2 ℃, judging whether the return water temperature meets < 6 ℃, if the return water temperature meets < 6 ℃, setting the return water temperature of the gas water heater to be 30 ℃, starting the gas water heater to execute a single cycle, and exiting the anti-freezing mode; if the backwater temperature is determined not to meet the requirement of less than 6 ℃, returning to continuously judge whether the backwater temperature meets the requirement of less than 2 ℃; if the backwater temperature is determined to be less than 2 ℃, when the backwater temperature of the gas water heater is set to be 35 ℃, the gas water heater is started to execute a single cycle, and the gas water heater exits the anti-freezing mode.
6. The control method of the zero-cold water gas water heater according to claim 1, wherein: and a circulating pipeline formed by the water inlet pipeline, the water outlet pipeline and the water return pipeline is used for circulating heating of the gas water heater.
7. The control method of the zero-cold water gas water heater according to claim 1, wherein: the water outlet temperature monitoring device is characterized in that a water outlet temperature probe is installed at the water outlet end of the main water path, the water outlet temperature probe is used for monitoring the water outlet temperature of the water outlet end of the main water path of the gas water heater in real time, a return water temperature probe is installed at the water inlet end of the main water path, the return water temperature probe is used for monitoring the return water temperature of the water inlet end of the main water path of the gas water heater in real time, and the water outlet temperature probe and the return water temperature probe are respectively and electrically connected with the controller.
8. The control method of the zero-cold-water gas water heater according to claim 1, characterized in that: and a water flow sensor is arranged on the main water path and is used for detecting a water flow signal of the main water path.
9. The control method of the zero-cold-water gas water heater according to claim 1, characterized in that: the gas heater internally mounted has the inspection fire needle, it is used for detecting whether there is flame to examine the fire needle.
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