CN111981698B - Gas water heater and control method thereof - Google Patents
Gas water heater and control method thereof Download PDFInfo
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- CN111981698B CN111981698B CN202010823814.0A CN202010823814A CN111981698B CN 111981698 B CN111981698 B CN 111981698B CN 202010823814 A CN202010823814 A CN 202010823814A CN 111981698 B CN111981698 B CN 111981698B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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Abstract
The invention discloses a gas water heater, comprising: the combustor is used for igniting gas and comprises at least two combustion areas divided by a sectional valve, wherein one combustion area is provided with an ignition needle and all the combustion areas are provided with flame induction needles; and the control section is configured to: controlling the ignition needle to be started in response to a starting instruction; determining whether to ignite the fuel gas in the rest combustion areas according to the temperature difference between the preset target temperature and the currently measured inlet water temperature; when the fuel gas in the rest combustion areas needs to be ignited, a sectional valve for communicating the current combustion area with the combustion area to be ignited is opened; and when the flame induction needle in the combustion area to be ignited does not induce a flame signal in the first ignition time period, reducing the wind speed of the fan. The invention further discloses a control method of the gas water heater, and by adopting the embodiment of the invention, the gas in the gas water heater can be fully combusted, and the problem of gas leakage or deflagration is avoided.
Description
Technical Field
The invention relates to the field of water heaters, in particular to a gas water heater and a control method thereof.
Background
With the iteration of the combustion technology of the gas water heater, many gas water heaters on the market are multi-segment combustion at present. The gas water heater with the sectional combustion has more fire rows and more combustion sections, but the combustor still uses a set of ignition and induction devices. Under the condition of poor quality of an air source and the like, one or more sections of multi-section burning of the gas hot gas device are only filled with gas and are not burnt, the gas is continuously discharged into the machine without being burnt, the gas leakage or deflagration can be caused, and a fire can be caused in serious cases.
Disclosure of Invention
The embodiment of the invention aims to provide a gas water heater and a control method thereof, which can enable gas in the gas water heater to be fully combusted and avoid the problem of gas leakage or deflagration.
In order to achieve the above object, an embodiment of the present invention provides a gas water heater, including:
the combustor is used for igniting gas and comprises at least two combustion areas divided by a sectional valve, wherein one combustion area is provided with an ignition needle and all the combustion areas are provided with flame induction needles; and the number of the first and second groups,
the control section is configured to:
in response to a starting instruction, controlling the ignition needle to start so as to ignite the gas in the current combustion area;
determining whether to ignite the fuel gas in the rest combustion areas according to the temperature difference between the preset target temperature and the currently measured inlet water temperature;
when the fuel gas in the rest combustion areas needs to be ignited, a sectional valve for communicating the current combustion area with the combustion area to be ignited is opened;
judging whether a flame induction needle in the combustion area to be ignited induces a flame signal in a first ignition time period;
and when the flame induction needle does not induce a flame signal in the first ignition time period, reducing the wind speed of the fan.
As an improvement of the above scheme, after the wind speed of the wind turbine is reduced, the method further comprises:
judging whether a flame induction needle in the combustion area to be ignited induces a flame signal in a second ignition time period;
and when the flame induction needle does not induce a flame signal in the second ignition time period, controlling the gas water heater to cut off the gas valve and sending an alarm prompt.
As a refinement of the above, the control section is further configured to:
when the flame sensing needle which has sensed the flame signal loses the flame signal, judging whether the flame sensing needle senses the flame signal again in a third ignition time period;
if yes, entering a standby state after the gas water heater is used; if not, reducing the wind speed of the fan;
after the wind speed of the fan is reduced, judging whether the flame sensing needle senses the flame signal again in a fourth ignition time period;
and when the flame induction needle does not induce a flame signal in the fourth ignition time period, controlling the gas water heater to cut off the gas valve and sending an alarm prompt.
As an improvement of the above scheme, the reducing the wind speed of the wind turbine includes:
reducing the wind speed of the fan from a normal wind speed to a preset wind speed, and controlling the fan to keep the preset wind speed unchanged within a preset time period;
and after the preset time period is exceeded, controlling the wind speed of the fan to recover from the preset wind speed to the normal wind speed.
As an improvement of the above scheme, the fan is started before the ignition needle is started, and the ignition needle is started after the wind speed of the fan reaches a preset normal wind speed.
As an improvement of the scheme, fire rows are arranged in the combustor, and the number of the fire rows in different combustion areas is unequal.
In order to achieve the above object, an embodiment of the present invention further provides a control method for a gas water heater, including:
controlling an ignition needle of the gas water heater to be started to ignite gas in a current combustion area in response to a starting instruction; the gas water heater comprises at least two combustion areas which are divided by a section valve, wherein an ignition needle is arranged in one combustion area, and flame induction needles are arranged in all the combustion areas;
determining whether to ignite the fuel gas in the rest combustion areas according to the temperature difference between the preset target temperature and the currently measured inlet water temperature;
when the fuel gas in the rest combustion areas needs to be ignited, a sectional valve for communicating the current combustion area with the combustion area to be ignited is opened;
judging whether a flame induction needle in the combustion area to be ignited induces a flame signal in a first ignition time period;
and when the flame induction needle does not induce a flame signal in the first ignition time period, reducing the wind speed of the fan.
As an improvement of the above scheme, after the wind speed of the wind turbine is reduced, the method further comprises:
judging whether a flame induction needle in the combustion area to be ignited induces a flame signal in a second ignition time period;
and when the flame induction needle does not induce a flame signal in the second ignition time period, controlling the gas water heater to cut off the gas valve and sending an alarm prompt.
As an improvement of the above, the method further comprises:
when the flame sensing needle which has sensed the flame signal loses the flame signal, judging whether the flame sensing needle senses the flame signal again in a third ignition time period;
if yes, entering a standby state after the gas water heater is used; if not, reducing the wind speed of the fan;
after the wind speed of the fan is reduced, judging whether the flame sensing needle senses the flame signal again in a fourth ignition time period;
and when the flame induction needle does not induce a flame signal in the fourth ignition time period, controlling the gas water heater to cut off the gas valve and sending an alarm prompt.
As an improvement of the above scheme, the reducing the wind speed of the wind turbine includes:
reducing the wind speed of the fan from a normal wind speed to a preset wind speed, and controlling the fan to keep the preset wind speed unchanged within a preset time period;
and after the preset time period is exceeded, controlling the wind speed of the fan to recover from the preset wind speed to the normal wind speed.
Compared with the prior art, the gas water heater and the control method thereof disclosed by the embodiment of the invention have the advantages that a flame induction needle is arranged in each combustion area in the gas water heater, and after the ignition needle starts to ignite the gas in the current combustion area, whether the gas in the rest combustion areas needs to be ignited or not is determined according to the temperature difference between the pre-target temperature and the water inlet temperature; when the rest of the combustion areas need to be ignited, the sectional valve is opened; when the flame induction needle in the combustion area to be ignited induces a flame signal in the first ignition time period, the wind speed of the fan is reduced. Because when all the other combustion areas ignite, whether the current combustion area is ignited or not is determined by judging the flame induction needle, whether the combustion area is ignited smoothly or not can be accurately judged, in addition, when the ignition failure of the combustion area occurs, the flame transfer time is prolonged by reducing the wind speed of the fan, the gas is re-combusted, the gas in the gas water heater can be fully combusted, and the problem of gas leakage or deflagration is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a gas water heater provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a burner of a gas water heater provided by an embodiment of the invention;
FIG. 3 is a flow chart of the operation of a gas water heater provided by an embodiment of the present invention;
FIG. 4 is another flow chart of operation of a gas water heater provided by an embodiment of the present invention;
fig. 5 is a flowchart of a control method for a gas water heater according to an embodiment of the present invention.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1, fig. 1 shows a gas water heater according to a first embodiment of the present invention, including:
the burner 10 is used for igniting gas and comprises at least two burning areas which are divided by adopting a sectional valve, wherein one burning area is provided with an ignition needle, and all the burning areas are provided with flame induction needles; and the number of the first and second groups,
the control section 20 is configured to:
in response to a starting instruction, controlling the ignition needle to start so as to ignite the gas in the current combustion area;
determining whether to ignite the fuel gas in the rest combustion areas according to the temperature difference between the preset target temperature and the currently measured inlet water temperature;
when the fuel gas in the rest combustion areas needs to be ignited, a sectional valve for communicating the current combustion area with the combustion area to be ignited is opened;
judging whether a flame induction needle in the combustion area to be ignited induces a flame signal in a first ignition time period;
and when the flame induction needle does not induce a flame signal in the first ignition time period, reducing the wind speed of the fan.
Further, referring to FIG. 2, the combustor 10 includes three combustion zones A, B, C partitioned with a staging valve. The sectional valve is a baffle plate provided with a valve, and when the valve is opened, the combustion areas on two sides of the sectional valve are communicated, so that fuel gas can be diffused to another combustion area from the current combustion area. The burner 10 is provided with fire rows, and the number of the fire rows in different burning areas is unequal. Wherein, A district contains 8 fire rows, and B district contains 3 fire rows, and C district contains 4 fire rows, and gas heater can realize four kinds of different segmentation burning forms (3 rows, 7 rows, 11 rows, 15 rows) through the control to different regional gas. It should be noted that there are many segmentation methods for the gas water heater, which is only one of the reasonable segmentation methods, and in practical use, the number of fire rows in each combustion area can be arbitrarily divided, which is not specifically limited in the present invention.
An ignition needle is arranged in one of the combustion areas of the burner 10 and a flame induction needle is arranged in all the combustion areas. Taking the burner in fig. 2 as an example, the first two are all flame sensing needles which are respectively arranged in the B, C, A areas and used for sensing whether flame signals exist in the corresponding combustion areas or not; the ignition needle is used for igniting gas, and electric sparks generated by the high-voltage pulser are released through the ignition needle during ignition so as to ignite the gas in the area; fifthly, the fire grate is adopted; and sixthly, is the shell of the combustor 10. It is worth mentioning that when there are three or more combustion zones in the gas water heater, the ignition needle should be located in the central or more central combustion zone, so as to facilitate ignition of the combustion zone of the partition.
Specifically, when a user opens a hot water faucet, if the water flow in the pipeline of the gas water heater is greater than the starting water flow of the gas water heater, the gas water heater responds to a starting instruction to start an ignition program, and the ignition needle is controlled to be started so as to ignite the gas in the current combustion area. In the process, the flame induction needle judges whether a flame signal is induced; if yes, judging that the current combustion area is successfully combusted, and stopping igniting the high-voltage pulser at the moment; if not, secondary ignition is carried out, the flame induction needle judges whether a flame signal is induced again, whether ignition is successful is checked, normal combustion is carried out if ignition is successful, and if not, a machine reports a fault.
After the combustion area where the ignition needle is located is normally combusted, whether other combustion areas need to be ignited or not needs to be judged. In one embodiment, a target temperature set by a user and a water inlet temperature measured by a temperature sensor at the position of a water inlet of a gas water heater are obtained; feeding back the inlet water temperature to the control part 20, and calculating the required heat load by the control part 20 according to the temperature difference between the target temperature and the inlet water temperature; if the heat load is smaller than a preset load threshold value, other combustion areas do not need to be ignited, and combustion can be realized only in one combustion area; if the heat load is greater than the load threshold, other combustion zones need to be ignited, and the predetermined heat load cannot be reached by combustion in one combustion zone alone, so combustion in the remaining combustion zones is required to increase the heat load.
In another embodiment, a target temperature set by a user, inflow water flow measured by a water flow sensor and inflow water temperature measured by a temperature sensor at the position of a water inlet of a gas water heater are obtained; feeding back the inlet water temperature and the inlet water flow to the control part 20, and calculating the required heat load by the control part 20 according to the temperature difference between the target temperature and the inlet water flow; if the thermal load is less than the load threshold, then other combustion zones need not be ignited; if the thermal load is greater than the load threshold, then additional combustion zones need to be ignited.
When gas in the rest combustion areas needs to be ignited, a sectional valve for communicating the current combustion area with the combustion area to be ignited is opened, namely, a valve of the sectional valve is opened at the moment, the gas in the current combustion area can be diffused to the combustion area to be ignited through the valve, and a flame induction needle in the combustion area to be ignited judges whether a flame signal is induced in a first ignition time period or not; if yes, indicating that the ignition is successful, normally operating the water heater, and entering a standby state after the use of a user is finished; if not, indicating that the ignition fails, reducing the wind speed of the fan at the moment to prolong the fire transfer time, and being beneficial to the ignition of the flame in the current combustion area to the combustion area to be ignited so as to achieve the purpose of fire transfer. After the wind speed of the fan is reduced, whether a flame sensing needle in the combustion area to be ignited senses a flame signal in a second ignition time period is judged; when the flame induction needle induces a flame signal in a second ignition time period, indicating that ignition is successful, and enabling the water heater to normally operate to enter a standby state after the use of a user is finished; and when the flame induction needle does not induce a flame signal in the second ignition time period, controlling the gas water heater to cut off the gas valve and sending an alarm prompt.
Optionally, the first ignition time period is 2s, and the second ignition time period is 3 s. The wind speed of the fan is reduced, and the method comprises the following steps: reducing the wind speed of the fan from a normal wind speed to a preset wind speed, and controlling the fan to keep the preset wind speed unchanged within a preset time period; and after the preset time period is exceeded, controlling the wind speed of the fan to recover from the preset wind speed to the normal wind speed. The preset time period is 3 s. It is worth to be noted that the fan is started before the ignition needle is started, and the ignition needle is started after the wind speed of the fan reaches a preset normal wind speed.
For example, taking the burner in fig. 2 as an example for illustration, the region B is used as the region where the ignition needle is located, and is ignited at the first time, when the region a needs to be ignited, the gas channel leading to the region a is opened, and the gas enters the fire discharging sheet in the region a and is ignited by the flame in the region B. The flame induction needle in the area A induces a flame signal within 2s, and the area A burns normally; if the flame sensing needle in the area A does not sense a flame signal within 2s, the wind speed of the fan is reduced from the normal wind speed V to a preset wind speed by 200r/min, and the wind speed is maintained for 3s and is restored to V again. If the flame induction needle in the area A senses a flame signal within 3s, the area A is normally combusted, the water heater normally operates, and a user enters a standby state after use; if the flame sensing needle in the area A does not sense the flame signal in 3s, the gas water heater actively cuts off the gas valve, stops burning, reports a fault code, and sends out a prompt tone to remind a user of overhauling.
It is worth mentioning that the above process can be referred to fig. 3.
Further, the embodiment of the invention also provides a method for preventing a certain combustion section flameout condition of the gas water heater during multi-section combustion, and the process can refer to fig. 4. At this time, the control section 20 is further configured to:
when the flame sensing needle which has sensed the flame signal loses the flame signal, judging whether the flame sensing needle senses the flame signal again in a third ignition time period;
if yes, entering a standby state after the gas water heater is used; if not, reducing the wind speed of the fan;
after the wind speed of the fan is reduced, judging whether the flame sensing needle senses the flame signal again in a fourth ignition time period;
and when the flame induction needle does not induce a flame signal in the fourth ignition time period, controlling the gas water heater to cut off the gas valve and sending an alarm prompt.
Optionally, the third ignition time period is 2s and the fourth ignition time period is 3 s.
Taking the burner in fig. 2 as an example for explanation, in normal combustion of the water heater, the flame sensing needle in the area a can sense a flame signal, if the flame sensing needle in the area a loses the flame signal in an unprogrammed manner after a period of time and does not recover the normal signal within 2s, the control part 20 does not close the area, the gas in the area is normally ventilated, but the flame is extinguished, namely the abnormal combustion is performed, at this time, the control part 20 controls the wind speed of the fan to be reduced by 200r/min from the normal wind speed V ', and recovers to V' again after keeping for a period of time t, and then the area is given a chance of transmitting the fire once, if the flame sensing needle in the area a does not sense the flame signal within 3s, the water heater cuts off the gas valve, stops combustion, reports a fault code, and sends out a prompt sound to remind a user of overhaul; if a flame signal is sensed in the flame sensing needle 3s in the area A, the combustion is normal. The area A burns normally, the gas water heater operates normally, and the gas water heater enters a standby state after the use of a user is finished.
Compared with the prior art, the gas water heater disclosed by the embodiment of the invention is characterized in that each combustion area in the gas water heater is provided with the flame induction needle, and after the ignition needle starts to ignite the gas in the current combustion area, whether the gas in the other combustion areas needs to be ignited or not is determined according to the temperature difference between the pre-target temperature and the water inlet temperature; when the rest of the combustion areas need to be ignited, the sectional valve is opened; when the flame induction needle in the combustion area to be ignited induces a flame signal in the first ignition time period, the wind speed of the fan is reduced. Because when all the other combustion areas ignite, whether the current combustion area is ignited or not is determined by judging the flame induction needle, whether the combustion area is ignited smoothly or not can be accurately judged, in addition, when the ignition failure of the combustion area occurs, the flame transfer time is prolonged by reducing the wind speed of the fan, the gas is re-combusted, the gas in the gas water heater can be fully combusted, and the problem of gas leakage or deflagration is avoided.
Referring to fig. 5, fig. 5 shows a gas water heater control method according to a second embodiment of the present invention, including:
s11, responding to a starting instruction, controlling an ignition needle of the gas water heater to start so as to ignite the gas in the current combustion area;
s12, determining whether ignition of fuel gas in other combustion areas is needed or not according to the temperature difference between the preset target temperature and the currently measured inlet water temperature;
s13, when the fuel gas in the rest combustion areas needs to be ignited, opening a sectional valve for communicating the current combustion area with the combustion area to be ignited;
s14, judging whether a flame induction needle in the combustion area to be ignited induces a flame signal in a first ignition time period;
and S15, when the flame induction needle does not induce a flame signal in the first ignition time period, reducing the wind speed of the fan.
The gas water heater comprises at least two combustion areas divided by a section valve, wherein an ignition needle is arranged in one combustion area, and flame induction needles are arranged in all the combustion areas. The combustor is provided with fire rows, and the number of the fire rows in different combustion areas is unequal.
Specifically, in step S11, when the user opens the hot water faucet, if the water flow in the pipeline of the gas water heater is greater than the starting water flow of the gas water heater, the gas water heater starts an ignition program in response to the starting instruction, and controls the ignition needle to start to ignite the gas in the current combustion area. In the process, the flame induction needle judges whether a flame signal is induced; if yes, judging that the current combustion area is successfully combusted, and stopping igniting the high-voltage pulser at the moment; if not, secondary ignition is carried out, the flame induction needle judges whether a flame signal is induced again, whether ignition is successful is checked, normal combustion is carried out if ignition is successful, and if not, a machine reports a fault.
Specifically, in step S12, after the combustion region where the ignition needle is located is normally combusted, it is necessary to determine whether to ignite another combustion region at this time.
In one embodiment, a target temperature set by a user and a water inlet temperature measured by a temperature sensor at the position of a water inlet of a gas water heater are obtained; feeding back the temperature of the inlet water to a control part, and calculating the required heat load by the control part according to the temperature difference between the target temperature and the temperature of the inlet water; if the heat load is smaller than a preset load threshold value, other combustion areas do not need to be ignited, and combustion can be realized only in one combustion area; if the heat load is greater than the load threshold, other combustion zones need to be ignited, and the predetermined heat load cannot be reached by combustion in one combustion zone alone, so combustion in the remaining combustion zones is required to increase the heat load.
In another embodiment, a target temperature set by a user, inflow water flow measured by a water flow sensor and inflow water temperature measured by a temperature sensor at the position of a water inlet of a gas water heater are obtained; feeding back the inlet water temperature and the inlet water flow to a control part, and calculating the required heat load by the control part according to the temperature difference between the target temperature and the inlet water flow; if the thermal load is less than the load threshold, then other combustion zones need not be ignited; if the thermal load is greater than the load threshold, then additional combustion zones need to be ignited.
Specifically, in step S13, when it is necessary to ignite the gas in the remaining combustion area, a segment valve that communicates the current combustion area with the combustion area to be ignited is opened, that is, the valve of the segment valve is opened, and the gas in the current combustion area is diffused to the combustion area to be ignited through the valve.
Specifically, in steps S14 to S15, the flame induction needle in the combustion area to be ignited determines whether it induces a flame signal within a first ignition time period; if yes, indicating that the ignition is successful, normally operating the water heater, and entering a standby state after the use of a user is finished; if not, indicating that the ignition fails, reducing the wind speed of the fan at the moment to prolong the fire transfer time, and being beneficial to the ignition of the flame in the current combustion area to the combustion area to be ignited so as to achieve the purpose of fire transfer.
Further, after the wind speed of the fan is reduced, the method also comprises steps S16-S18:
s16, judging whether a flame induction needle in the combustion area to be ignited induces a flame signal in a second ignition time period;
s17, when the flame induction needle does not induce a flame signal in a second ignition time period, controlling the gas water heater to cut off the gas valve and sending an alarm prompt;
and S18, when the flame induction needle induces the flame signal in the second ignition time period, indicating that the ignition is successful, and enabling the water heater to normally operate and enter a standby state after the use of a user is finished.
Optionally, the first ignition time period is 2s, and the second ignition time period is 3 s.
Further, the reducing the wind speed of the fan comprises the following steps of S21-S22:
s21, reducing the wind speed of the fan from the normal wind speed to a preset wind speed, and controlling the fan to keep the preset wind speed unchanged in a preset time period; the preset time period is 3 s;
and S22, controlling the wind speed of the fan to recover to the normal wind speed from the preset wind speed after the preset time period is exceeded.
Furthermore, the embodiment of the present invention further provides a method for preventing flameout of a certain combustion section during multi-section combustion of a gas water heater, where the method further includes steps S31-S34:
s31, when the flame sensing needle which has sensed the flame signal loses the flame signal, judging whether the flame sensing needle senses the flame signal again in a third ignition time period;
s32, if yes, entering a standby state after the gas water heater is used; if not, reducing the wind speed of the fan;
s33, after the wind speed of the fan is reduced, whether the flame sensing needle senses a flame signal again in a fourth ignition time period is judged;
and S34, when the flame induction needle does not induce a flame signal in the fourth ignition time period, controlling the gas water heater to cut off the gas valve and sending an alarm prompt.
Optionally, the third ignition time period is 2s and the fourth ignition time period is 3 s.
Compared with the prior art, the control method of the gas water heater disclosed by the embodiment of the invention has the advantages that a flame induction needle is arranged in each combustion area in the gas water heater, and after the ignition needle starts to ignite the gas in the current combustion area, whether the gas in the other combustion areas needs to be ignited or not is determined according to the temperature difference between the pre-target temperature and the water inlet temperature; when the rest of the combustion areas need to be ignited, the sectional valve is opened; when the flame induction needle in the combustion area to be ignited induces a flame signal in the first ignition time period, the wind speed of the fan is reduced. Because when all the other combustion areas ignite, whether the current combustion area is ignited or not is determined by judging the flame induction needle, whether the combustion area is ignited smoothly or not can be accurately judged, in addition, when the ignition failure of the combustion area occurs, the flame transfer time is prolonged by reducing the wind speed of the fan, the gas is re-combusted, the gas in the gas water heater can be fully combusted, and the problem of gas leakage or deflagration is avoided.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (6)
1. A gas water heater, comprising:
the combustor is used for igniting gas and comprises at least two combustion areas divided by a sectional valve, wherein one combustion area is provided with an ignition needle and all the combustion areas are provided with flame induction needles; and the number of the first and second groups,
the control section is configured to:
in response to a starting instruction, controlling the ignition needle to start so as to ignite the gas in the current combustion area;
determining whether to ignite the fuel gas in the rest combustion areas according to the temperature difference between the preset target temperature and the currently measured inlet water temperature;
when the fuel gas in the rest combustion areas needs to be ignited, a sectional valve for communicating the current combustion area with the combustion area to be ignited is opened;
judging whether a flame induction needle in the combustion area to be ignited induces a flame signal in a first ignition time period;
when the flame induction needle does not induce a flame signal in a first ignition time period, reducing the wind speed of the fan; wherein, reduce the wind speed of fan, include: reducing the wind speed of the fan from a normal wind speed to a preset wind speed, and controlling the fan to keep the preset wind speed unchanged within a preset time period;
after the wind speed of the fan is reduced, whether a flame sensing needle in the combustion area to be ignited senses a flame signal in a second ignition time period is judged;
when the flame induction needle does not induce a flame signal in a second ignition time period, controlling the gas water heater to cut off the gas valve and sending an alarm prompt;
when the flame sensing needle which has sensed the flame signal loses the flame signal, judging whether the flame sensing needle senses the flame signal again in a third ignition time period;
if yes, entering a standby state after the gas water heater is used; if not, reducing the wind speed of the fan;
after the wind speed of the fan is reduced, judging whether the flame sensing needle senses the flame signal again in a fourth ignition time period;
and when the flame induction needle does not induce a flame signal in the fourth ignition time period, controlling the gas water heater to cut off the gas valve and sending an alarm prompt.
2. The gas water heater of claim 1, wherein said reducing the wind speed of the fan further comprises:
and after the preset time period is exceeded, controlling the wind speed of the fan to recover from the preset wind speed to the normal wind speed.
3. The gas water heater of claim 1, wherein said fan is activated before said ignition needle is activated, and said ignition needle is activated after a wind speed of said fan reaches a preset normal wind speed.
4. The gas fired water heater of claim 1, wherein fire rows are provided in said burner, the number of fire rows in different said combustion zones being unequal.
5. A method of controlling a gas water heater, comprising:
controlling an ignition needle of the gas water heater to be started to ignite gas in a current combustion area in response to a starting instruction; the gas water heater comprises at least two combustion areas which are divided by a section valve, wherein an ignition needle is arranged in one combustion area, and flame induction needles are arranged in all the combustion areas;
determining whether to ignite the fuel gas in the rest combustion areas according to the temperature difference between the preset target temperature and the currently measured inlet water temperature;
when the fuel gas in the rest combustion areas needs to be ignited, a sectional valve for communicating the current combustion area with the combustion area to be ignited is opened;
judging whether a flame induction needle in the combustion area to be ignited induces a flame signal in a first ignition time period;
when the flame induction needle does not induce a flame signal in a first ignition time period, reducing the wind speed of the fan; wherein, reduce the wind speed of fan, include: reducing the wind speed of the fan from a normal wind speed to a preset wind speed, and controlling the fan to keep the preset wind speed unchanged within a preset time period;
after the wind speed of the fan is reduced, whether a flame sensing needle in the combustion area to be ignited senses a flame signal in a second ignition time period is judged;
when the flame induction needle does not induce a flame signal in a second ignition time period, controlling the gas water heater to cut off the gas valve and sending an alarm prompt;
when the flame sensing needle which has sensed the flame signal loses the flame signal, judging whether the flame sensing needle senses the flame signal again in a third ignition time period;
if yes, entering a standby state after the gas water heater is used; if not, reducing the wind speed of the fan;
after the wind speed of the fan is reduced, judging whether the flame sensing needle senses the flame signal again in a fourth ignition time period;
and when the flame induction needle does not induce a flame signal in the fourth ignition time period, controlling the gas water heater to cut off the gas valve and sending an alarm prompt.
6. The gas water heater control method of claim 5, wherein reducing the wind speed of the fan further comprises:
and after the preset time period is exceeded, controlling the wind speed of the fan to recover from the preset wind speed to the normal wind speed.
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