CN117663490A - Gas water heating equipment, water flow regulating method thereof and readable storage medium - Google Patents

Abstract

The present disclosure provides a gas water heating apparatus, a water flow rate adjusting method thereof, and a readable storage medium. The water flow regulating method of the gas water heating equipment comprises the following steps: monitoring the temperature of the inlet water; when the water inlet temperature is less than or equal to a preset water inlet temperature threshold value, the water flow regulating valve is regulated to a preset opening smaller than the maximum opening of the water flow regulating valve and kept for a specific time period; when the specific time period is reached, the water flow regulating valve is regulated to the maximum opening degree. Because the water inlet temperature is too low, the water flow can be limited by adjusting the water flow regulating valve so as to avoid the impact of large-flow cold water to a user, then the flow limitation is controlled within a specific time period as short as possible, and the flow limitation is canceled when the water temperature is heated to a proper temperature, so that the user can enjoy the large-flow water with comfortable water temperature as soon as possible.

Description

Gas water heating equipment, water flow regulating method thereof and readable storage medium

Technical Field

The disclosure relates to the field of gas water heating equipment control, in particular to a gas water heating equipment, a water flow adjusting method thereof and a readable storage medium.

Background

Gas water heating plants generally comprise a gas water heater and a gas boiler. The gas water heater is used for supplying domestic hot water such as drinking water, bathing water and the like; and the gas boiler can be used for providing domestic hot water and also can be communicated with a radiator arranged indoors to provide central heating. Gas water heating devices generally have a rated minimum combustion load and rated maximum combustion load, however, in winter, due to the fact that the water inlet temperature is too low, even if the device works in the maximum combustion load section, the heating of domestic hot water is still slow, the time for heating the water to the set temperature is long, and the water temperature is low in the period, so that the experience of a user in using hot water, especially in bathing, is greatly affected.

Disclosure of Invention

To overcome the problems in the background art, the present disclosure provides a gas water heating device, a water flow adjusting method thereof, and a readable storage medium.

A first aspect of an embodiment of the present disclosure provides a water flow rate adjustment method of a gas water heating apparatus, including: monitoring the temperature of the inlet water; when the water inlet temperature is less than or equal to a preset water inlet temperature threshold value, the water flow regulating valve is regulated to a preset opening smaller than the maximum opening of the water flow regulating valve and kept for a specific time period; when the specific time period is reached, the water flow regulating valve is regulated to the maximum opening degree.

In some embodiments, the specific time period is determined according to the total time period required for the water inlet temperature to be heated from the initial value to the target value.

In some embodiments, the specific time period is a preset fixed time period, and the preset fixed time period is determined according to the number of liters of the gas water heating device.

In some embodiments, the circulating water pump is turned off and the fuel gas proportional valve current is increased by a predetermined compensation amount during the specific time period.

In some embodiments, the water flow rate adjustment method of the gas water heating device further comprises: monitoring water flow, and calculating a demand heat load according to the monitored water inlet temperature and water flow; and when the required heat load is greater than or equal to the rated maximum heat load, adjusting the opening of the water flow regulating valve according to the rated maximum heat load, and closing the circulating water pump.

In some embodiments, the water flow rate adjustment method of the gas water heating device further comprises: monitoring the outlet water temperature and the water flow, and calculating the required heat load according to the monitored inlet water temperature and water flow; when the water outlet temperature is greater than or equal to a preset first water outlet temperature threshold value, or the water flow is less than or equal to a preset water flow threshold value, or the required heat load is less than or equal to a rated minimum heat load, the water flow regulating valve is made to be in a maximum opening.

In some embodiments, the water flow rate adjustment method of the gas water heating device further comprises: and starting the circulating water pump to work when the water flow regulating valve is at the maximum opening.

In some embodiments, the water flow rate adjustment method of the gas water heating device further comprises: when the water outlet temperature is greater than or equal to a preset second water outlet temperature threshold value which is higher than the first water outlet temperature threshold value, the gas valve is closed, and meanwhile, the water flow regulating valve is at the maximum opening degree, and the circulating water pump continuously operates for a preset time.

A second aspect of the disclosed embodiments provides a computer-readable storage medium having stored thereon instructions which, when executed by a processor, perform the above-described method steps.

A third aspect of the disclosed embodiments provides a gas water heating apparatus comprising a feed water temperature sensor, a water flow regulator valve, and a controller. Wherein the controller is configured to: monitoring the water inlet temperature through a water inlet temperature sensor; when the water inlet temperature is less than or equal to a preset water inlet temperature threshold value, the water flow regulating valve is regulated to a preset opening smaller than the maximum opening of the water flow regulating valve and kept for a specific time period; and when the specific time length is up, regulating the water flow regulating valve to the maximum opening.

In some embodiments, the specific time period is determined according to the total time period required for the water inlet temperature to be heated from the initial value to the target value.

In some embodiments, the gas water heating apparatus further comprises a circulating water pump and a gas proportional valve; the controller is further configured to turn off the circulating water pump and increase the fuel gas proportional valve current by a predetermined compensation amount during the specific time period.

In some embodiments, the gas water heating apparatus further comprises a water outlet temperature sensor, a water flow sensor; the controller is further configured to: the water outlet temperature is monitored through a water outlet temperature sensor, the water flow is monitored through a water flow sensor, and the required heat load is calculated according to the monitored water inlet temperature and the monitored water flow; when the water outlet temperature is greater than or equal to a preset first water outlet temperature threshold value, or the water flow is less than or equal to a preset water flow threshold value, or the required heat load is less than or equal to a rated minimum heat load, the water flow regulating valve is made to be in a maximum opening.

In some embodiments, the gas water heating apparatus further comprises a circulating water pump; the controller is further configured to activate the circulating water pump when the water flow rate regulating valve is at a maximum opening.

The technical solution provided by one or more embodiments of the present disclosure may include the following beneficial effects: because the water inlet temperature is too low, the water flow can be limited by adjusting the water flow regulating valve so as to avoid the impact of large-flow cold water to a user, then the flow limitation is controlled within a specific time period as short as possible, and the flow limitation is canceled when the water temperature is heated to a proper temperature, so that the user can enjoy the large-flow water with comfortable water temperature as soon as possible.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

FIG. 1 is a schematic block diagram of a gas water heating apparatus connected to a water heating system in an embodiment of the present disclosure;

FIG. 2 is a schematic block diagram of a gas water heating apparatus connected to a water heating system in accordance with another embodiment of the present disclosure;

FIG. 3 is a flow chart of a control method of the gas water heating apparatus for water flow regulation in the first embodiment;

FIG. 4 is a flow chart of a control method of the gas water heating apparatus for water flow regulation in a second embodiment;

FIG. 5 is a flow chart of a control method of the gas water heating apparatus for water flow regulation in a third embodiment;

fig. 6 is a flowchart of a control method of the gas water heating apparatus for water flow rate adjustment in the fourth embodiment.

Detailed Description

The embodiments shown in the drawings will be described in detail below. These embodiments do not represent all embodiments consistent with the present disclosure, and structural, methodological, or functional transformations of one of ordinary skill in the art based on these embodiments are included within the scope of the appended claims.

The gas water heating device is a gas water heater which takes combustible gas as fuel, such as natural gas, city gas, liquefied gas, biogas and the like, and provides heat by burning the combustible gas to meet the living demands of users, for example, a gas water heater which provides living hot water, a dual-purpose gas boiler which can simultaneously provide living hot water and heating demands, and the like.

The hot water system 100 according to one embodiment of the present disclosure as shown in fig. 1, wherein the gas water heating apparatus is a gas water heater, which is in communication with a water point (such as a mixing valve tap) 70 through a cold water pipe 51 and a hot water pipe 52; further, a return pipe 53 is connected between the gas water heating apparatus and the hot water pipe 52. The pipeline can be a water flow passage formed by connecting a plurality of water pipes. The water consumption points can be multiple and are respectively connected with the cold water pipeline and the hot water pipeline. In this embodiment, the water usage point 70 is one water usage point farthest or farther from the gas water heating apparatus among the plurality of water usage points. When the gas water heating apparatus is operated in the bathroom mode, i.e., domestic hot water is supplied, cold water and hot water are supplied to the water point 70 via the cold water pipe 51 and the hot water pipe 52, respectively, and are mixed and then outputted. When the gas water heating device works in the preheating circulation mode, hot water output by the device flows back to the device through the hot water pipeline 52 and the water return pipe 53 to be reheated. In some embodiments, a check valve 54 is also provided on the return pipe 53 to limit the flow of water from the hot water line 52 to the gas water heater only in one direction via the return pipe 53.

The gas water heating apparatus includes a housing 10, a burner assembly, a heat exchanger 13, a smoke exhaust device, and the like, which are housed in the housing 10. The housing 10 may be formed from a plurality of panels that are joined together to form a receiving space therein for receiving the components. A water inlet pipe 111, a water outlet pipe 112, and a gas supply line 113 extend from the bottom of the housing 10.

The burner assembly generally includes a gas distribution frame (not shown) and a burner 12. A gas valve assembly 15 is provided on the gas supply line 113, which typically includes a gas valve and a gas proportional valve integrated together. The gas valve and the gas proportional valve can be electrically controllable valves, the gas valve is used for connecting or disconnecting a gas supply channel, and the gas proportional valve is used for controlling the gas supply quantity entering the gas distribution frame. In some embodiments, the combustor 12 includes several combustion units arranged side-by-side in the longitudinal direction. Each combustion unit has a flat plate shape, which is generally vertically fixed in a burner frame, has an air inlet provided at a lower portion thereof, has a plurality of fire holes provided at a top portion thereof, and a gas-air mixing passage communicating the air inlet and the plurality of fire holes. The gas passing through the gas valve assembly 15 is distributed through the gas distributor into the gas inlet of each combustion unit and is mixed with the primary air entering simultaneously in the gas-air mixing channel and delivered to the fire holes at the top of the fire grate for combustion and generation of hot flue gas. The burner assembly further comprises ignition means 121 for igniting the gas and air mixture, and flame detection means 122 for detecting the presence or absence of a flame. In some embodiments, the ignition device 121 includes a pair of ignition electrodes extending above the fire holes of the combustion unit. The flame detection means 122 comprises a flame detection electrode extending over the fire hole of the combustion unit.

The heat generated by the combustion of the burner 12 passes through a heat exchanger 13. The heat exchanger 13 is typically disposed above the burner 12. In some embodiments, the heat exchanger may be a fin-and-tube heat exchanger, i.e., a heat exchanger housing having a plurality of fins disposed therein through which a heat exchange water pipe passes in a detour, both ends of which are respectively in communication with an inlet pipe 111 located upstream in the water flow direction and an outlet pipe 112 located downstream in the water flow direction. The heat generated by the combustion of the gas-air mixture is absorbed by the fins and further transferred to the water flowing through the heat exchange water pipe, and the heated water is transferred to the hot water pipe 52 through the water outlet pipe 112, thereby providing domestic hot water for drinking, bathing, etc. to the user.

In some embodiments, a fan 16 may be provided below the burner 12 to drive the flow of air to provide the air required for combustion and to cause the smoke produced by the combustion to be collected by the hood of the smoke evacuation device and to be exhausted through a smoke evacuation line (not shown) connected to the hood. A water inlet temperature sensor 171 is provided at the inlet pipe 111 (e.g., on the outer wall of the inlet pipe) for sensing the temperature of the water flow through the inlet pipe. In the warm-up circulation mode, the water inlet temperature sensor 171 is used to detect the temperature of the return water flowing into the water inlet pipe 111 through the water return pipe 53, and is therefore used as a return water temperature sensor at this time; and in the bathroom mode, the temperature sensor 171 is used to detect the temperature of cold water flowing into the inlet pipe 111. A water outlet temperature sensor 172 is disposed at the outlet pipe 112 (e.g., on the outer wall of the outlet pipe) for detecting the temperature of the water outlet passing through the outlet pipe. The temperature sensor may be a thermistor, such as a positive temperature coefficient thermistor (Positive Temperature Coefficient, PTC), and in some embodiments, the temperature sensor may also be a negative temperature coefficient (Negative Temperature Coefficient, NTC) temperature sensor. A circulation pump 19 is provided in the waterway for driving or promoting water flow, and in some embodiments, the circulation pump 18 may be connected in the water inlet pipe 111.

A water flow sensor 14 is provided in the waterway for sensing water flow. In some embodiments, the water flow sensor 14 may be mounted at the inlet pipe 111 for detecting the flow of inlet water, and may include a rotor assembly with magnets and hall elements, the rotor assembly being rotated when water flows through the sensor, thereby utilizing the hall effect of the hall elements to measure the magnetic physical quantity. A water flow regulator valve 18 is provided in the waterway for controlling the amount of water flow in the waterway. The water flow regulator valve 18 may be an electrically actuated valve, such as a motor actuated valve cartridge assembly, to regulate the amount of water flow from the outlet of the valve. Preferably, the motor may be a stepper motor to achieve fine adjustment of the water flow. In some embodiments, the water flow sensor 14 and the water flow regulator valve 18 may be integrated together, i.e., form a water volume server. As is well known to those skilled in the art, the water volume servo typically includes a valve body, a water flow rotor assembly, a hall sensor, a valve cartridge assembly, a motor, and the like. When water passes through, the magnetic water flow rotor rotates, the Hall sensor senses and transmits a current signal to the controller 20, and the controller 20 then controls the motor to drive the valve core assembly to act so as to adjust the water quantity of the water outlet of the valve body. In these embodiments, the water flow sensor 14 and the water flow regulator valve 18 are not separate components and form part of a water volume server, and the motor-driven valve cartridge assembly acts to substantially regulate the water flow regulator valve.

A controller 20 is provided within the housing 10 for detecting and controlling the operation of the various components and circuit devices within the gas water heating apparatus. In some embodiments, the controller 20 may be a control circuit including a processor and a memory, and a plurality of electronic components connected in a wired manner. The processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or any conventional processor. In this embodiment, the processor is a control center of the gas water heating apparatus that connects the various parts of the apparatus using various interfaces and lines. For example, the controller 20 is in wired electrical connection or wireless communication with the air valve assembly 15, the fan 16, the inlet water temperature sensor 171, the outlet water temperature sensor 172, the flow sensor 14, the water flow rate adjustment valve 18, the circulating water pump 19, and the like.

The memory may be used to store instructions of any application or method operating on the processor of the controller, as well as various types of data. The processor implements various functions of the gas water heating apparatus by running or executing programs or instructions stored in the memory and invoking data stored in the memory. The memory may comprise any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), magnetic memory, flash memory, solid state memory, magnetic or optical disk, and the like.

Fig. 2 shows a further embodiment of a hot water system 200, which is similar to the heating system 100 shown in fig. 1, with the main difference that the return pipe 63 is connected between the cold water pipe 51 and the hot water pipe 52 near the water point 70 by means of two three-way connections 61, 62. By the mode, even if a user does not lay the water return pipe in advance in the house decoration, the water return pipe can be connected between the cold water pipe and the hot water pipe at the water consumption point (such as the lower part of the basin) at the far end of the gas water heating equipment to realize the preheating circulation function. Similarly, the return pipe 63 is further provided with a check valve 64 to limit the flow of water from the hot water line 52 to the cold water line 51 via the return pipe 63 and further back to the gas water heating apparatus via the inlet pipe 111.

Fig. 3 shows the steps of the control method for water flow rate adjustment of the gas water heating apparatus in the first embodiment, and the steps of the method are described in detail below with reference to the execution of the steps by the controller 20.

The controller 20 monitors the inlet water temperature Ti in real time through the inlet water temperature sensor 171 (step 301), and determines whether the current inlet water temperature is less than or equal to a predetermined inlet water temperature threshold Til (step 302). The inlet temperature threshold Til is low and may be, for example, 10 ℃. When the intake water temperature Ti is less than or equal to the intake water temperature threshold Til, indicating that the intake water temperature is low due to low ambient temperature in winter, the controller 20 adjusts the water flow rate adjustment valve 18 to a predetermined opening (step 303) so that the water flow rate is maintained at a low level. The predetermined opening degree is preset and smaller than the maximum opening degree, for example, may be half of the valve full-open time; if the water flow in the pipe is 8L/min (liters/min) when the valve is fully open, i.e., without restriction, then the water flow in the pipe drops to 4L/min after the water flow regulator valve 18 is adjusted to the predetermined opening. In some embodiments, the controller 20 may adjust the water flow regulator valve 18 to a predetermined opening by adjusting the number of steps of travel of the stepper motor. In some embodiments, the water flow in the line may be too small, or even less than the start-up flow, e.g., 2.5L/min, when the water flow regulator valve 18 reaches a predetermined opening, and the predetermined opening may be redetermined with the start-up flow as the target flow. If the inlet water temperature Ti is greater than the inlet water temperature threshold Til, the controller 20 continues to monitor the inlet water temperature.

The water flow rate adjustment valve 18 is maintained for a certain period of time after being adjusted to a predetermined opening degree. The specific time period is also preset. In some embodiments, the specific time period is determined based on the total time period required for the inlet water temperature to be heated from an initial value to a target value. The target value may be a target value for a plant warm-up cycle; the initial value may be the current inlet water temperature. For example, the device may first start the preheating cycle mode, and the total time period required for heating from the initial value to the target value is T, and then the specific time period T may be half of the total time period T, that is, 0.5T, or may be near half of the total time period T, for example, 0.4 to 0.6T. This means that when a certain period of time is reached, almost half of the water in the circulation line has been preheated, and this part of the water normally fills the hot water line 52 first. In other embodiments, the specific time period may also be a preset fixed time period, which is generally dependent on the household area, the pipe length, etc. of the user's home, which is generally related to the number of liters of the gas water heating apparatus, so that the fixed time period may be determined according to the number of liters of the gas water heating apparatus. For example, the specific time period of the 12L gas water heating apparatus may be preset to 4 minutes, the specific time period of the 14L gas water heating apparatus may be preset to 5 minutes, the specific time period of the 17L gas water heating apparatus may be preset to 6 minutes, and the specific time period of the 20L gas water heating apparatus and above may be preset to 7 minutes.

The controller 20 determines whether a certain period of time has been reached (step 304). During the specific time period, that is, when the specific time period has not been reached, the controller 20 can cause the circulating water pump 19 to be turned off and increase the current of the fuel gas proportional valve by a preset compensation amount, for example, by 2-3 mA (milliamp), so that the fuel gas supply amount can be increased and the combustion can be promoted; simultaneously, the rotating speed of the fan can be correspondingly adjusted to promote combustion. If the specified duration is reached, the controller 20 adjusts the water flow regulator valve 18 to a maximum opening (step 304) and maintains, i.e., removes the restriction, resumes maximum water flow in the line. In the above embodiment, since the intake water temperature is too low, the water flow rate can be limited by adjusting the water flow rate adjusting valve to avoid the impact of large-flow cold water to the user, and then the flow limit is controlled within a specific time period as short as possible, and the flow limit is canceled when the water temperature is heated to a proper temperature, so that the user can enjoy the large-flow water with comfortable water temperature as soon as possible.

Fig. 4 shows the steps of the control method for water flow rate adjustment of the gas water heating apparatus in the second embodiment, and the steps of the method are described in detail below with reference to the execution of the steps by the controller 20. The controller 20 monitors the inlet water temperature Ti through the inlet water temperature sensor 171, monitors the water flow rate M through the water flow rate sensor 14, and calculates the required heat load Q based on the monitored inlet water temperature and water flow rate (step 341). Calculation of the required heat load Q is generally obtained according to the formula q=c×m× (Ttar-Ti). Wherein c is the specific heat capacity of water, M is the current water flow, ttar is the hot water outlet temperature preset by a user, and Ti is the current inlet water temperature. After obtaining the required heat load Q, the controller 20 further determines whether the required heat load Q is greater than or equal to the rated maximum heat load Qmax (step 342); if so, the controller 20 may adjust the opening of the water flow rate adjusting valve 18 according to the rated maximum heat load (step 343) to limit the water flow accordingly, so as to avoid the impact of large-flow cold water to the user. In some embodiments, the corresponding water flow may be calculated according to a rated maximum heat load, for example, m=qmax/(c× (Ttar-Ti)), where M is the current water flow, qmax is the rated maximum heat load, c is the specific heat capacity of water, ttar is the hot water outlet temperature preset by the user, and Ti is the current inlet water temperature; then, according to the corresponding relation between the preset water flow and the step number of the stepping motor, the controller controls the stepping motor to operate so as to drive the valve core to move to the corresponding position, and accordingly the corresponding opening of the water flow regulating valve is achieved. Similar to the first embodiment, the adjusted opening is maintained for a certain period of time, and the controller 20 may turn off the circulation water pump 19 and increase the fuel gas proportional valve current by a predetermined compensation amount during the certain period of time; when the specified duration is reached, the controller 20 adjusts the water flow regulator valve 18 to a maximum opening to cancel the restriction and restore the maximum water flow in the line.

Fig. 5 shows steps of a control method for water flow rate adjustment of the gas water heating apparatus in the third embodiment, and the steps of the method are described in detail below with reference to the execution of the steps by the controller 20.

The controller 20 monitors the water outlet temperature To through the water outlet temperature sensor 172 (step 331), and determines whether the water outlet temperature To is greater than or equal To a predetermined first water outlet temperature threshold Tol1 (step 332). The first water outlet temperature threshold Tol1 may be a predetermined higher temperature, such as 70 ℃. When the water outlet temperature To is greater than or equal To the predetermined first water outlet temperature threshold To 1, which indicates that the hot water outlet temperature is high at this time and may affect the user experience, the controller 20 adjusts or maintains the water flow rate adjusting valve 18 To the maximum opening (step 313) so as To maximize the water flow rate in the pipeline, thereby reducing the water outlet temperature. The higher hot water outlet temperature may be caused by various factors, such as a smaller water flow due to a larger pipeline resistance, or a demand heat load is usually smaller than a rated minimum heat load due to a higher ambient temperature in summer, etc., so that the early intervention before the hot water outlet temperature reaches the higher temperature can be performed by monitoring and controlling the trigger factors.

In some embodiments, the controller 20 monitors the water flow through the water flow sensor 14 (step 311) and determines whether the current water flow M is less than or equal to a predetermined water flow threshold M1 (step 312). The water flow rate threshold M1 may be a predetermined small flow rate value, such as 5L/min. If the current water flow M is less than or equal to the water flow threshold M1, indicating that there is a possibility of greater resistance in the pipeline at present, the controller 20 causes the water flow regulating valve 18 to adjust to or maintain at the maximum opening (step 313) to increase the water flow in the pipeline, thereby avoiding the situation of higher water outlet temperature. In some embodiments, controller 20 calculates a demand heat load Q based on the monitored inlet water temperature and water flow rate (step 321). Calculation of the required heat load Q is generally obtained according to the formula q=c×m× (Ttar-Ti). Wherein c is the specific heat capacity of water, M is the current water flow, ttar is the set temperature of hot water outlet, and Ti is the current inlet water temperature. That is, the controller 20 obtains the target temperature to be reached by the heating water preset and stored by the user from the memory, and then calculates the required heat load Q according to the set temperature, the current inlet water temperature, and the current water flow. After obtaining the required heat load Q, the controller 20 further determines whether the required heat load Q is less than or equal to the rated minimum heat load Qmin (step 322); if so, indicating that there is currently a possibility of a lower water flow due to a higher resistance in the pipeline, a higher ambient temperature and a higher inlet water temperature, or both, resulting in a lower demand heat load, the controller 20 causes the water flow regulator valve 18 to adjust to or maintain at a maximum opening (step 313) to increase the water flow in the pipeline, thereby avoiding a higher outlet water temperature. When the water flow regulating valve 18 is at the maximum opening, the controller 20 can also control the circulating water pump 19 to start working so as to further increase the water flow in the pipeline.

Fig. 6 shows steps of a control method of water flow rate adjustment of the gas water heating apparatus in the fourth embodiment, and a detailed description of the steps of the method performed by the controller 20 is provided below. The controller 20 monitors the water outlet temperature To through the water outlet temperature sensor 172 (step 351), and determines whether the water outlet temperature To is greater than or equal To a predetermined second water outlet temperature threshold Tol2 (step 352). The second water outlet temperature threshold Tol2 may be preset and higher than the first water outlet temperature threshold Tol1, for example 80 ℃. When the water outlet temperature To is greater than or equal To the predetermined second water outlet temperature threshold To 2, which indicates that the hot water outlet temperature is too high at this time and may scald the user, the controller 20 controls the gas valve To close (step 353), i.e. the combustion is stopped; at the same time, the water flow regulating valve 18 is regulated or maintained to be at the maximum opening (step 354), and the circulating water pump 19 is controlled to continuously operate for a predetermined period of time (step 355), so that the water flow can be promoted to take away the waste heat, and the water outlet temperature can be quickly reduced, so that the user is prevented from being scalded.

All or part of the steps in the methods of the above disclosed embodiments may be accomplished by computer programs to instruct related hardware. The computer program may be stored in a computer readable storage medium, which computer program, when being executed by a processor, implements the steps of the various method embodiments described above. Wherein the computer program comprises computer program code, which may be in source code form, object code form, executable file or some intermediate form, etc. The readable storage medium may comprise any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), magnetic memory, flash memory, solid state memory, magnetic or optical disk, and the like.

It should be understood that the methods and apparatus disclosed in the foregoing disclosure may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, such as the division of units in a controller is merely a division of one logic function, and there may be additional divisions in actual implementation, e.g., multiple units may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the components, elements, units discussed above may be electrically, mechanically, or otherwise connected to each other; may be a direct connection or an indirect connection via some interfaces or the like; either a wired connection or a wireless communication.

Further, the units described above as separate members may or may not be physically separate, and members shown as units may or may not be physical units; some or all of the elements may be selected according to actual needs to achieve the objectives of the disclosed embodiment. In addition, each functional unit in each embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.

It should be understood that although the present disclosure describes embodiments in terms of examples, not every embodiment is provided with a single embodiment, and that this description is for clarity only, and that the embodiments of the disclosure may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

Claims (14)

1. A method for regulating water flow of a gas water heating device, the method comprising:

monitoring the temperature of the inlet water;

when the water inlet temperature is less than or equal to a preset water inlet temperature threshold value, the water flow regulating valve is regulated to a preset opening smaller than the maximum opening of the water flow regulating valve and kept for a specific time period;

and when the specific time length is up, regulating the water flow regulating valve to the maximum opening.

2. A method of regulating water flow of a gas water heating apparatus according to claim 1, wherein: the specific time period is determined according to the total time period required by the water inlet temperature to be heated from an initial value to a target value.

3. A method of regulating water flow of a gas water heating apparatus according to claim 1, wherein: the specific time length is a preset fixed time length, and the preset fixed time length is determined according to the number of the liters of the gas water heating equipment.

4. A method of regulating water flow of a gas water heating apparatus according to claim 1, wherein: and in the specific time period, the circulating water pump is closed, and the current of the fuel gas proportional valve is increased by a preset compensation amount.

5. A method of regulating water flow of a gas water heating apparatus according to claim 1, wherein: the method also comprises

Monitoring water flow, and calculating a demand heat load according to the monitored water inlet temperature and water flow;

and when the required heat load is greater than or equal to the rated maximum heat load, adjusting the opening of the water flow regulating valve according to the rated maximum heat load, and closing the circulating water pump.

6. A method of regulating water flow of a gas water heating apparatus according to claim 1, wherein: the method also comprises

Monitoring the outlet water temperature and the water flow, and calculating the required heat load according to the monitored inlet water temperature and water flow;

when the water outlet temperature is greater than or equal to a preset first water outlet temperature threshold value, or the water flow is less than or equal to a preset water flow threshold value, or the required heat load is less than or equal to a rated minimum heat load, the water flow regulating valve is made to be in a maximum opening.

7. A method of regulating water flow of a gas water heating apparatus as claimed in claim 6, wherein: the method further comprises the step of starting the circulating water pump to work when the water flow regulating valve is at the maximum opening.

8. A method of regulating water flow of a gas water heating apparatus as claimed in claim 7, wherein: the method further comprises the steps of closing the gas valve when the water outlet temperature is greater than or equal to a preset second water outlet temperature threshold value which is higher than the first water outlet temperature threshold value, enabling the water flow regulating valve to be at the maximum opening degree, and enabling the circulating water pump to continuously operate for a preset time.

9. A computer-readable storage medium having instructions stored thereon, characterized by: the instructions, when executed by a processor, implement the method of any of claims 1-8.

10. A gas water heating apparatus, characterized in that: the gas water heating equipment comprises a water inlet temperature sensor, a water flow regulating valve and a controller; wherein the controller is configured to

Monitoring the water inlet temperature through a water inlet temperature sensor;

when the water inlet temperature is less than or equal to a preset water inlet temperature threshold value, the water flow regulating valve is regulated to a preset opening smaller than the maximum opening of the water flow regulating valve and kept for a specific time period;

and when the specific time length is up, regulating the water flow regulating valve to the maximum opening.

11. Gas water heating apparatus according to claim 10, characterized in that: the specific time period is determined according to the total time period required by the water inlet temperature to be heated from an initial value to a target value.

12. Gas water heating apparatus according to claim 10, characterized in that: the gas water heating equipment also comprises a circulating water pump and a gas proportional valve; the controller is further configured to turn off the circulating water pump and increase the fuel gas proportional valve current by a predetermined compensation amount during the specific time period.

13. Gas water heating apparatus according to claim 10, characterized in that: the gas water heating equipment also comprises a water outlet temperature sensor and a water flow sensor; the controller is further configured to

The water outlet temperature is monitored through a water outlet temperature sensor, the water flow is monitored through a water flow sensor, and the required heat load is calculated according to the monitored water inlet temperature and the monitored water flow;

when the water outlet temperature is greater than or equal to a preset first water outlet temperature threshold value, or the water flow is less than or equal to a preset water flow threshold value, or the required heat load is less than or equal to a rated minimum heat load, the water flow regulating valve is made to be in a maximum opening.

14. Gas water heating apparatus according to claim 13, characterized in that: the gas water heating equipment also comprises a circulating water pump; the controller is further configured to start the circulating water pump to operate when the water flow rate regulating valve is at the maximum opening.