CN114017925A - Gas water heater and reignition method and control device thereof - Google Patents
Gas water heater and reignition method and control device thereof Download PDFInfo
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- CN114017925A CN114017925A CN202111215483.3A CN202111215483A CN114017925A CN 114017925 A CN114017925 A CN 114017925A CN 202111215483 A CN202111215483 A CN 202111215483A CN 114017925 A CN114017925 A CN 114017925A
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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 application relates to a gas water heater and a reignition method and a control device thereof. The gas water heater comprises a fan and a smoke exhaust system. The reignition method of the gas water heater comprises the following steps: if detecting that the gas water heater is accidentally flamed out in the using process, acquiring the state of a smoke exhaust system; if the smoke exhaust system is in a dredging state, carrying out a reignition attempt lasting for a first ignition duration; if the smoke exhaust system is in a blocking state, the rotating speed of the fan is increased, and if the rotating speed is increased, the smoke exhaust system enters a blocking and dredging state, the first ignition duration is reduced, and a reignition attempt is performed. Because the process of fan acceleration and mediation jam has consumed the certain time, this application guarantees through reducing the time length of reigniting the attempt that the attempt of reigniting is gone on when the gas volume in the combustion chamber is in the safety margin, has guaranteed the safety of reigniting in-process.
Description
Technical Field
The application relates to the technical field of water heaters, in particular to a gas water heater and a reignition method and a control device thereof.
Background
The gas water heater can continuously and timely provide domestic hot water, is comfortable and convenient to use, and is popular with consumers.
The gas heater can carry out the relighting when the unexpected circumstances of putting out a fire, but the safety in the relighting process is difficult to guarantee to traditional relighting mode.
Disclosure of Invention
The invention aims to solve the first technical problem of providing a reignition method of a gas water heater, which can safely reignite the gas water heater.
The second technical problem to be solved by the invention is to provide a gas water heater capable of safely relighting.
The third technical problem to be solved by the invention is to provide a control device of a gas water heater, which can ensure that the gas water heater can be safely re-ignited.
The first technical problem is solved by the following technical solutions:
a reignition method of a gas water heater, the gas water heater comprising a fan and a smoke exhaust system, the reignition method comprising: if detecting that the gas water heater is accidentally flamed out in the using process, acquiring the state of a smoke exhaust system; if the smoke exhaust system is in a dredging state, carrying out a reignition attempt lasting for a first ignition duration; if the smoke exhaust system is in a blocking state, the rotating speed of the fan is increased, and if the rotating speed is increased, the smoke exhaust system enters a blocking and dredging state, the first ignition duration is reduced, and a reignition attempt is performed.
Based on the reignition method of the gas water heater in the embodiment, when the gas water heater is unexpectedly shut down, how to perform the reignition attempt is determined according to whether the gas water heater is blocked. Specifically, when the smoke evacuation system is in a unblocking state, a reignition attempt is directly made for a first ignition duration. When the smoke exhaust system is in a blocked state, the blockage is dredged by increasing the rotating speed of the fan. After the blockage is eliminated, the smoke exhaust system enters a blockage dredging state, and because the processes of fan speed increase and blockage dredging consume a certain time, the embodiment ensures that the reignition attempt is carried out when the gas quantity in the combustion chamber is within a safety limit by reducing the time length of the reignition attempt, so that the safety in the reignition process is ensured.
In one embodiment, the step of obtaining the status of the smoke evacuation system comprises: acquiring the rotating speed of a fan; if the rotating speed meets the first condition, judging that the smoke exhaust system is in a dredging state; the first condition is that the difference between the rotating speed and a first reference rotating speed is smaller than a first threshold value, and the first reference rotating speed is a theoretical rotating speed corresponding to the first control current; and if the rotating speed does not meet the first condition, judging that the smoke exhaust system is in a blocked state.
In one embodiment, if the smoke exhaust system is in a blocked state, the rotation speed of the fan is increased, and if the smoke exhaust system enters a blocked dredging state after the rotation speed is increased, the first ignition duration is reduced and the reignition trying step includes: if the smoke exhaust system is in a blocking state, the control current of the fan is increased from the first control current to the second control current so as to increase the rotating speed, and if the rotating speed meets a second condition after the control current of the fan is the second control current, the smoke exhaust system is judged to enter the blocking and dredging state, the first ignition duration is reduced to be the second ignition duration, and a reignition attempt lasting the second ignition duration is performed; the second condition is that the rotation speed is increased within the first speed increasing period until the difference with a second reference rotation speed is smaller than a second threshold value, and the second reference rotation speed is a theoretical rotation speed corresponding to the second control current.
In one embodiment, the occlusion break state comprises a first occlusion break state and a second occlusion break state; if the smoke exhaust system is in a blocking state, the control current of the fan is increased from the first control current to the second control current so as to increase the rotating speed, and if the rotating speed meets a second condition after the control current of the fan is the second control current, the steps of judging that the smoke exhaust system enters the blocking and dredging state, reducing the first ignition duration to be a second ignition duration and carrying out the reignition attempt for the second ignition duration comprise: if the smoke exhaust system is in a blocked state, the control current of the fan is increased from the first control current to the second control current so as to increase the rotating speed; if the rotating speed meets a second condition after the control current of the fan is a second control current, judging that the smoke exhaust system enters a first blockage dredging state, reducing the first ignition duration to be a second ignition duration, and performing reignition attempt for the second ignition duration; if the rotating speed does not meet the second condition after the control current of the fan is the second control current, the control current of the fan is increased from the second control current to a third control current, and if the rotating speed meets the third condition after the control current of the fan is the third control current, the smoke exhaust system is judged to enter a second blockage dredging state, the second ignition duration is reduced to be a third ignition duration, and a reignition attempt is carried out for the third ignition duration; the third condition is that the rotation speed is increased within the second speed-increasing period to a difference with a third reference rotation speed that is a theoretical rotation speed corresponding to the third control current that is less than a third threshold value.
In one embodiment, the reignition method of the gas water heater further comprises: and if the reignition attempt lasting for the first ignition time length, the reignition attempt lasting for the second ignition time length or the reignition attempt lasting for the third ignition time length is unsuccessful, controlling the gas water heater to stop, and after a maintenance worker inspects a specific blockage reason and maintains the blockage reason, reusing the gas water heater, so that the use safety of the gas water heater is ensured.
And if the gas is not reignited in the reignition attempt process lasting for the first ignition time period, the second ignition time period or the third ignition time period, the gas water heater is possibly in fault and cannot be normally used temporarily, and the gas water heater is controlled to stop.
In one embodiment, the reignition method of the gas water heater further comprises: when the reignition attempt lasting for the first ignition duration is carried out, if the flame ion current in the combustion chamber of the gas water heater is lower than a fourth threshold value, it is determined that the reignition attempt lasting for the first ignition duration is unsuccessful; when the re-ignition attempt lasting for the second ignition time period is carried out, if the flame ion flow in the combustion chamber of the gas water heater is lower than a fourth threshold value, the re-ignition attempt lasting for the second ignition time period is judged to be unsuccessful; and when the reignition attempt lasting for the third ignition duration is carried out, if the flame ion current in the combustion chamber of the gas water heater is lower than a fourth threshold value, determining that the reignition attempt lasting for the third ignition duration is unsuccessful.
In one embodiment, if it is detected that the gas water heater is accidentally turned off in the using process, the method further includes the following steps before acquiring the state of the smoke exhaust system: and if the flame ion flow in the combustion chamber of the gas water heater is lower than the fifth threshold value within the first time length or the change value of the pressure of the smoke exhaust system is greater than the sixth threshold value within the second time length in the use process of the gas water heater, judging that the gas water heater is flameout unexpectedly in the use process.
In one embodiment, the first time length is determined according to the input load of the gas water heater, and the larger the input load of the gas water heater is, the smaller the first time length is.
The second technical problem is solved by the following technical solutions:
the utility model provides a gas heater, includes fan and the system of discharging fume, still includes: and the controller is connected with the fan and comprises a memory and a processor, the memory stores a computer program, and the processor realizes the steps of the reignition method when executing the computer program.
Based on the gas water heater in the embodiment, when the gas water heater is accidentally extinguished, how to perform the reignition attempt is determined according to whether the gas water heater is blocked. Specifically, when the smoke evacuation system is in a unblocking state, a reignition attempt is directly made for a first ignition duration. When the smoke exhaust system is in a blocked state, the blockage is dredged by increasing the rotating speed of the fan. After the blockage is eliminated, the smoke exhaust system enters a blockage dredging state, and because the processes of fan speed increase and blockage dredging consume a certain time, the embodiment ensures that the reignition attempt is carried out when the gas quantity in the combustion chamber is within a safety limit by reducing the time length of the reignition attempt, so that the safety in the reignition process is ensured.
The third technical problem is solved by the following technical solutions:
a control device of a gas water heater, a fan of the gas water heater and a smoke exhaust system, the control device comprises: the smoke exhaust system state acquisition module is used for acquiring the state of the smoke exhaust system if accidental flameout of the gas water heater in the using process is detected; the first reignition module is used for performing reignition attempt lasting for a first ignition duration if the smoke exhaust system is in a dredging state; and the second reignition module is used for increasing the rotating speed of the fan if the smoke exhaust system is in a blocked state, and reducing the first ignition duration and performing reignition attempt if the smoke exhaust system enters a blocked dredging state after the rotating speed is increased.
Based on the control device of the gas water heater in the embodiment, when the gas water heater is accidentally turned off, how to perform the reignition attempt is determined according to whether the gas water heater is blocked or not. Specifically, when the smoke evacuation system is in a unblocking state, a reignition attempt is directly made for a first ignition duration. When the smoke exhaust system is in a blocked state, the blockage is dredged by increasing the rotating speed of the fan. After the blockage is eliminated, the smoke exhaust system enters a blockage dredging state, and because the processes of fan speed increase and blockage dredging consume a certain time, the embodiment ensures that the reignition attempt is carried out when the gas quantity in the combustion chamber is within a safety limit by reducing the time length of the reignition attempt, so that the safety in the reignition process is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart diagram illustrating a method for reigniting a gas water heater in one embodiment;
FIG. 2 is a schematic flow chart illustrating a process for obtaining the status of the smoke evacuation system in one embodiment;
FIG. 3 is a schematic flow chart of a method for reigniting a gas water heater in another embodiment;
FIG. 4 is a flow chart illustrating the adjustment of the duration of a re-ignition attempt in one embodiment;
FIG. 5 is a schematic view of a gas water heater in one embodiment;
fig. 6 is a block diagram showing a control device of the gas water heater according to the embodiment.
Description of reference numerals: 10-gas water heater, 100-control device of gas water heater, 110-smoke exhaust system state acquisition module, 130-first re-ignition module, 150-second re-ignition module.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
Spatial relational terms, such as "under," "below," "under," "over," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
As background art, when the gas water heater in the prior art is accidentally extinguished during use, the gas water heater may be stopped to ensure safe use, but in this way, a user suddenly showers cold water during bathing, which may bring a poor use experience to the user. At present, some gas water heaters attempt to reignite after accidental flameout so as to solve the problem of accidental flameout of the gas water heaters. However, when the reignition is attempted, the gas in the combustion chamber still keeps outputting, and if the reignition is attempted for too long, the gas concentration in the combustion chamber may be too high, which is not favorable for the safe use of the gas water heater.
Based on the reasons, the invention provides a reignition method of a gas water heater capable of safely reigniting, wherein the applied gas water heater comprises a fan and a smoke exhaust system. Specifically, the smoke exhaust system of the gas water heater is usually communicated with the combustion chamber of the gas water heater, and the fan is used for providing a proper amount of air for the gas in the combustion chamber and exhausting the smoke generated when the gas in the combustion chamber is combusted to the outside through the smoke exhaust system. As shown in fig. 1, the reignition method of the gas water heater in the present embodiment includes steps S102 to S106.
S102, if detecting that the gas water heater is flamed out accidentally in the using process, acquiring the state of the smoke exhaust system.
Specifically, the reason for accidental flameout of a gas water heater during use is generally insufficient air supply or insufficient gas supply. Failure of the fan, blockage of the exhaust system, etc. may result in an insufficient supply of air. Gas pipe blockage, unstable gas pressure, etc. may result in insufficient gas supply. The state of the smoke evacuation system described in this embodiment is mainly a state related to the clogging of the smoke evacuation system. In one embodiment, the gas water heater enters a flameout protection mode when detecting that the gas water heater is accidentally flameout during use. The flameout protection mode of the gas water heater in the application is not like the flameout protection mode of the traditional gas water heater, the flameout protection mode is directly stopped and a protection fault code is output, the reignition attempt is carried out according to the following reignition related steps, and poor use experience caused by interruption of a user in the hot water using process is reduced as much as possible.
And S104, if the smoke exhaust system is in a dredging state, performing a reignition attempt lasting for a first ignition duration.
It will be appreciated that the blockage of the exhaust system may be due to carbon deposits in the exhaust system over a long period of use of the gas water heater, or due to excessive wind pressure outside the exhaust system. The smoke exhaust system is in a dredging state, namely the smoke exhaust system does not have the problems, and the gas water heater can work normally again as long as the gas supply and the air supply are recovered to be normal. The reignition attempt refers to keeping control over the gas supply quantity and the air supply quantity, and controlling the ignition device of the gas water heater to ignite, for example, controlling the ignition device to release electric sparks by keeping the proportional valve current on the gas pipeline and the control current of the fan. The re-ignition attempt for the first ignition period means that the ignition device is controlled to ignite until the gas is re-combusted if the gas is not successfully re-combusted in the first ignition period.
And S106, if the smoke exhaust system is in a blockage state, increasing the rotating speed of the fan, and if the rotating speed is increased and the smoke exhaust system enters a blockage dredging state, reducing the first ignition time and attempting to reignite.
It can be understood that the air supply of the gas water heater is difficult to control after the smoke exhaust system is in the blockage state, and the embodiment tries to blow the blockage away by increasing the wind power to enable the smoke exhaust system to enter the blockage dredging state by increasing the rotating speed of the fan. The difference between the blockage dredging state of the smoke exhaust system and the dredging state of the smoke exhaust system is that under the same input load, in order to continuously dredge the blockage, the rotating speed of a fan when the smoke exhaust system is in the blockage dredging state is higher than that when the smoke exhaust system is in the dredging state. For example, when there is a wind outside the system with a higher velocity, the fan speed will be maintained at a higher level than when there is no wind to keep the system unclogged. Because the process of dredging the blockage after the rotating speed of the fan is increased and the rotating speed of the fan is increased requires a certain time, the gas is still kept outputting at the moment, if the reignition trying time length which is the same as that in the step S104 is adopted, the gas in the combustion chamber is possibly too much, which is not beneficial to the safety of the gas water heater, and therefore the duration of the reignition trying after the smoke exhaust system enters the blockage dredging state is lower than the first ignition time length in the step S104.
Based on the reignition method of the gas water heater in the embodiment, when the gas water heater is unexpectedly shut down, how to perform the reignition attempt is determined according to whether the gas water heater is blocked. Specifically, when the smoke evacuation system is in a unblocking state, a reignition attempt is directly made for a first ignition duration. When the smoke exhaust system is in a blocked state, the blockage is dredged by increasing the rotating speed of the fan. After the blockage is eliminated, the smoke exhaust system enters a blockage dredging state, and because the processes of fan speed increase and blockage dredging consume a certain time, the embodiment ensures that the reignition attempt is carried out when the gas quantity in the combustion chamber is within a safety limit by reducing the time length of the reignition attempt, so that the safety in the reignition process is ensured.
In one embodiment, as shown in fig. 2, the step S102 of acquiring the state of the smoke evacuation system includes steps S202 to S206.
S202, acquiring the rotating speed of the fan.
And S204, if the rotating speed meets the first condition, judging that the smoke exhaust system is in a dredging state.
The first condition is that a difference between the rotation speed and a first reference rotation speed is smaller than a first threshold value, and the first reference rotation speed is a theoretical rotation speed corresponding to the first control current. It can be understood that the rotating speed of the fan is related to the control current of the fan, and the control current of the fan is in a corresponding relation with the reference rotating speed of the fan. When the smoke exhaust system is in a dredging state, the difference between the actual rotating speed of the fan and the first reference rotating speed is not large, so that when the rotating speed of the fan meets a first condition, the smoke exhaust system can be judged to be in the dredging state.
And S206, if the rotating speed does not meet the first condition, judging that the smoke exhaust system is in a blocking state.
The rotation speed not satisfying the first condition means that a difference between the rotation speed of the fan and the first reference rotation speed is greater than a first threshold value. It can be understood that when the smoke exhaust system is in a blocked state, the air entering the fan is reduced or even disappears, and the part for overcoming air resistance in the fan power is reduced, so that the rotating speed of the fan is accelerated, and when the rotating speed of the fan exceeds the first reference rotating speed, the smoke exhaust system can be judged to be in the blocked state.
In one embodiment, as shown in fig. 3, the reignition method of the gas water heater comprises steps S302 to S306.
S302, if accidental flameout of the gas water heater in the using process is detected, the state of the smoke exhaust system is obtained.
Step S302 is the same as step S102, and the above description can be referred to.
And S304, if the smoke exhaust system is in a dredging state, performing a reignition attempt lasting for a first ignition duration.
Step S304 is the same as step S104, and the above description can be referred to.
S306, if the smoke exhaust system is in a blocking state, the control current of the fan is increased from the first control current to the second control current so as to increase the rotating speed, and if the rotating speed meets a second condition after the control current of the fan is the second control current, the smoke exhaust system is judged to enter the blocking and dredging state, the first ignition duration is reduced to be the second ignition duration, and a reignition attempt lasting the second ignition duration is performed.
The second condition is that the rotation speed is increased within the first speed increasing period until the difference with a second reference rotation speed is smaller than a second threshold value, and the second reference rotation speed is a theoretical rotation speed corresponding to the second control current. It will be appreciated that in order to increase the speed of the fan in an attempt to break the blockage, the present embodiment increases the control current of the fan from a first control current to a second control current. If the blockage can be eliminated within the first speed-up duration, the difference between the rotating speed of the fan and the second reference rotating speed is smaller than a second threshold value, namely the rotating speed of the fan meets a second condition, the smoke exhaust system can be judged to enter a blockage dredging state at the moment, and the duration of the reignition attempt is reduced from the first ignition duration to a second ignition duration. The first ignition duration, the second ignition duration and the first speed-up duration can be selected according to gas flow, combustion chamber volume, gas concentration safety regulations and the like.
In one embodiment, the occlusion break state comprises a first occlusion break state and a second occlusion break state. The first blockage dredging state refers to a state after a slight blockage is dredged, and the second blockage dredging state refers to a state after a more serious blockage is dredged. As shown in fig. 4, step S306 includes steps S402 to S406.
S402, if the smoke exhaust system is in a blocking state, the control current of the fan is increased from the first control current to the second control current so as to increase the rotating speed.
S404, if the rotating speed meets a second condition after the control current of the fan is a second control current, the smoke exhaust system is judged to enter a first blockage dredging state, the first ignition duration is reduced to be a second ignition duration, and a reignition attempt is carried out for the second ignition duration.
S406, if the rotating speed does not meet the second condition after the control current of the fan is the second control current, the control current of the fan is increased from the second control current to a third control current, and if the rotating speed meets the third condition after the control current of the fan is the third control current, the smoke exhaust system is judged to enter a second blockage dredging state, the second ignition duration is reduced to be a third ignition duration, and a reignition attempt is carried out for the third ignition duration.
The third condition is that the rotation speed is increased within the second speed-increasing period to a difference with a third reference rotation speed that is a theoretical rotation speed corresponding to the third control current that is less than a third threshold value. It is understood that the second condition is not satisfied if the difference between the rotation speed of the fan and the second reference rotation speed is still greater than the second threshold value within the first speed-up period after the control current of the fan is the second control current. At this time, it can be determined that the current smoke exhaust system gives a serious blockage state, and only increasing the control current to the second control current is not enough to dredge the blockage, and the embodiment further increases the control current of the fan from the second control current to the third control current. If the rotating speed of the fan can remove serious blockage within the second speed-up duration, the difference between the rotating speed of the fan and the third reference rotating speed is smaller than a third threshold value, namely the rotating speed of the fan meets a third condition, the smoke exhaust system can be judged to enter a second blockage dredging state, and the duration of the reignition attempt is reduced to a third ignition duration from the second ignition duration. The first ignition duration, the second ignition duration, the third ignition duration, the first speed-up duration and the second speed-up duration can be selected according to gas flow, combustion chamber volume, gas concentration safety regulations and the like.
In one embodiment, the second threshold is selected to range from 150r/min to 350r/min, with a preferred value of 250 r/min. The third threshold is selected to have a value in the range of 200r/min to 400r/min, with a preferred value of 300 r/min. The value ranges of the first ignition duration, the second ignition duration and the third ignition duration are 4-12 seconds, and the value ranges of the first speed-up duration and the second speed-up duration are 2-5 seconds. The preferred group of the first ignition duration is 10 seconds, the second ignition duration is 6 seconds, the third ignition duration is 4 seconds, the first ramp-up duration is 2.5 seconds, and the second ramp-up duration is 2 seconds.
In one embodiment, increasing the control current of the fan from the second control current to the third control current further comprises: and if the rotating speed does not meet the third condition after the control current of the fan is the third control current, controlling the gas water heater to stop. It can be understood that when the control current of the fan is increased to the third control current and the third condition is not met, the blockage of the smoke exhaust system can be judged to be serious to the extent that the blockage cannot be solved only by the acceleration of the fan, at the moment, the gas water heater is controlled to be shut down, and a maintenance worker inspects the specific blockage reason and uses the gas water heater after maintaining the blockage, so that the use safety of the gas water heater is ensured.
In one embodiment, the method of reigniting a gas water heater further comprises: and if the re-ignition attempt lasting for the first ignition time period, the re-ignition attempt lasting for the second ignition time period or the re-ignition attempt lasting for the third ignition time period is not successful, controlling the gas water heater to stop. It can be understood that if the gas is not reignited during the reignition attempt lasting for the first ignition duration, the second ignition duration or the third ignition duration, it means that the gas water heater may be out of order and temporarily out of normal use, so the gas water heater is controlled to stop.
In one embodiment, the method of reigniting a gas water heater further comprises: when the reignition attempt lasting for the first ignition duration is carried out, if the flame ion currents in the combustion chamber of the gas water heater are all lower than a fourth threshold value, it is determined that the reignition attempt lasting for the first ignition duration is unsuccessful. And when the reignition attempt lasting for the second ignition time period is carried out, if the flame ion currents in the combustion chamber of the gas water heater are all lower than a fourth threshold value, determining that the reignition attempt lasting for the second ignition time period is unsuccessful. And when the reignition attempt lasting for the third ignition duration is carried out, if the flame ion current in the combustion chamber of the gas water heater is lower than a fourth threshold value, determining that the reignition attempt lasting for the third ignition duration is unsuccessful. It will be appreciated that the magnitude of the flame current in the combustion chamber may be indicative of whether or not gas is burning in the combustion chamber, and if the flame current in the combustion chamber is below the fourth threshold during all of the re-ignition attempts for the first ignition duration, the gas may be considered to have not re-ignited, i.e. the re-ignition attempts for the first ignition duration have not been successful. The unsuccessful attempts at re-ignition for the second ignition duration and the unsuccessful attempts at re-ignition for the third ignition duration are described similarly and will not be described further.
In one embodiment, the fourth threshold is 0.5 μ A.
In one embodiment, the method of reigniting a gas water heater further comprises: and if the flame ion flow in the combustion chamber of the gas water heater is lower than the fifth threshold value within the first time length or the change value of the pressure of the smoke exhaust system is greater than the sixth threshold value within the second time length in the use process of the gas water heater, judging that the gas water heater is flameout unexpectedly in the use process. It can be understood that whether flame extinguishes can be directly judged by monitoring the flame ion flow in real time, and accidental extinguishment is judged when the duration that the flame ion flow is lower than a fifth threshold value is the first duration in the use process of the gas water heater in order to avoid misjudgment caused by fluctuation. In addition, the smoke exhaust system blockage can cause insufficient air supply and accidental flameout, and the smoke exhaust system blockage can cause the pressure of the smoke exhaust system to be suddenly increased, so that the accidental flameout can be determined if the change value of the pressure of the smoke exhaust system in the second time period is larger than the sixth threshold value in the using process of the gas water heater.
In one embodiment, the fifth threshold is 0.3 μ A.
In one embodiment, the second duration is in a range of 2 to 7 seconds, preferably 2 seconds. The value range of the sixth threshold is 200Pa to 400Pa, and the preferred value is 300 Pa.
In one embodiment, the first time length is determined according to the input load of the gas water heater, and the larger the input load of the gas water heater is, the smaller the first time length is. It can be understood that the flame ion flow value is correspondingly larger when the input load is larger, and the first time length is adjusted according to the input load size to further improve the detection effectiveness of the system.
In one embodiment, the first time length value when the input load of the gas water heater is smaller than the first input load is larger than the first time length value when the input load of the gas water heater is at the first input load and the second input load, and the first time length value when the input load of the gas water heater is at the first input load and the second input load is larger than the first time length value when the input load of the gas water heater is larger than the second input load. Wherein the second input load is greater than the first input load. In one embodiment, the first input load is 35% of the rated input load and the second input load is 75% of the rated input load. When the input load of the gas water heater is less than 35% of the rated input load, the first time length value is 2 seconds. When the input load of the gas water heater is more than 35% of the rated input load and less than 75% of the rated input load, the first time length value is 1.5 seconds. When the input load of the gas water heater is greater than 75% of the rated input load, the first time length value is 1 second.
It should be understood that although the various steps in the flowcharts of fig. 1-4 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-4 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps or stages.
As shown in fig. 5, the embodiment of the present invention further provides a gas water heater 10, which includes a fan, a smoke exhaust system, and a controller. The controller is connected with the fan, the controller comprises a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the following steps:
if detecting that the gas water heater is accidentally flamed out in the using process, acquiring the state of a smoke exhaust system; if the smoke exhaust system is in a dredging state, carrying out a reignition attempt lasting for a first ignition duration; if the smoke exhaust system is in a blocking state, the rotating speed of the fan is increased, and if the rotating speed is increased, the smoke exhaust system enters a blocking and dredging state, the first ignition duration is reduced, and a reignition attempt is performed.
In some embodiments, the processor, when executing the computer program, performs the steps of any of the above-described methods of re-igniting a gas water heater.
In one embodiment, the gas water heater further comprises a rotation speed feedback unit, a control current feedback unit and a fan driving unit. The rotating speed feedback unit is used for feeding the rotating speed of the fan back to the controller, the control current feedback unit is used for feeding the control current of the fan back to the controller, and the fan driving unit is used for adjusting the control current of the fan according to the indication of the controller.
In one embodiment, the gas water heater further comprises a flame ion flow detection module, the flame ion flow detection module is connected with the controller, and the flame ion flow detection module is used for detecting flame ion flow in a combustion chamber of the gas water heater.
In one embodiment, the gas water heater further comprises a pressure detection module. The pressure detection module is connected with the controller and used for detecting the pressure of a smoke exhaust system of the gas water heater.
As shown in fig. 6, the embodiment of the present invention further provides a control device 100 of a gas water heater, a fan of the gas water heater, and a smoke exhaust system, wherein the control device 100 includes a smoke exhaust system state obtaining module 110, a first re-ignition module 130, and a second re-ignition module 150. The smoke exhaust system state obtaining module 110 is configured to obtain a state of the smoke exhaust system if it is detected that the gas water heater is unexpectedly extinguished in the using process. The first reignition module 130 is configured to perform a reignition attempt for a first ignition duration if the smoke evacuation system is in an unclogged state. The second reignition module 150 is configured to increase the rotation speed of the fan if the smoke exhaust system is in a blocked state, and decrease the first ignition duration and attempt reignition if the smoke exhaust system enters a blocked and unclogged state after the rotation speed is increased.
In one embodiment, the smoke exhaust system state acquisition module is specifically configured to acquire a rotation speed of the fan; if the rotating speed meets the first condition, judging that the smoke exhaust system is in a dredging state; and if the rotating speed does not meet the first condition, judging that the smoke exhaust system is in a blocked state. The first condition is that the difference between the rotating speed and the first reference rotating speed is smaller than a first threshold value, the first reference rotating speed is a theoretical rotating speed corresponding to the first control current, and the first control current is the control current of the fan when the fan is accidentally flamed out.
In one embodiment, the second reignition module is configured to increase the control current of the fan from the first control current to a second control current to increase the rotation speed if the smoke exhaust system is in the blocked state, and determine that the smoke exhaust system enters the blocked state and decrease the first ignition duration to a second ignition duration and perform a reignition attempt for the second ignition duration if the rotation speed satisfies a second condition after the control current of the fan is the second control current. The second condition is that the rotation speed is increased within the first speed increasing period until the difference with a second reference rotation speed is smaller than a second threshold value, and the second reference rotation speed is a theoretical rotation speed corresponding to the second control current.
In one embodiment, the occlusion break state comprises a first occlusion break state and a second occlusion break state. The second reignition module comprises a first processing unit, a second processing unit and a third processing unit. The first processing unit is used for increasing the control current of the fan from the first control current to the second control current to increase the rotating speed if the smoke exhaust system is in a blocked state. And the second processing unit is used for judging that the smoke exhaust system enters a first blockage dredging state, reducing the first ignition duration to be a second ignition duration and carrying out re-ignition attempt for the second ignition duration if the rotating speed meets a second condition after the control current of the fan is the second control current. The third processing unit is used for increasing the control current of the fan from the second control current to a third control current if the rotating speed does not meet the second condition after the control current of the fan is the second control current, and judging that the smoke exhaust system enters a second blockage dredging state and reduces the second ignition duration to be a third ignition duration and performs a reignition attempt for the third ignition duration if the rotating speed meets the third condition after the control current of the fan is the third control current. And the third condition is that the rotating speed is increased within the second speed increasing duration to a difference with a third reference rotating speed which is a theoretical rotating speed corresponding to the third control current and is smaller than a third threshold value.
In one embodiment, the control device of the gas water heater further comprises a shutdown protection module. And the shutdown protection module is used for controlling the gas water heater to be shut down if the rotating speed does not meet a third condition after the control current of the fan is a third control current.
In one embodiment, the shutdown protection module is further configured to control the gas water heater to shutdown if the attempt to re-ignite for the first ignition duration, the attempt to re-ignite for the second ignition duration, or the attempt to re-ignite for the third ignition duration is unsuccessful.
In one embodiment, the shutdown protection module includes a reignition determination unit. The reignition judging unit is used for judging that the reignition attempt lasting for the first ignition duration is unsuccessful if flame ion currents in a combustion chamber of the gas water heater are all lower than a fourth threshold value when the reignition attempt lasting for the first ignition duration is performed; when the re-ignition attempt lasting for the second ignition time period is carried out, if the flame ion flow in the combustion chamber of the gas water heater is lower than a fourth threshold value, the re-ignition attempt lasting for the second ignition time period is judged to be unsuccessful; and when the reignition attempt lasting for the third ignition duration is carried out, if the flame ion current in the combustion chamber of the gas water heater is lower than a fourth threshold value, determining that the reignition attempt lasting for the third ignition duration is unsuccessful.
In one embodiment, the gas water heater further comprises an accidental flameout determination module. And the flameout judging module is used for judging that the gas water heater is accidentally flameout in the using process if the flame ion current in the combustion chamber of the gas water heater is lower than a fifth threshold value in the first time length or the change value of the pressure of the smoke exhaust system in the second time length is greater than a sixth threshold value in the using process of the gas water heater.
In one embodiment, the accidental flameout determination module further includes a fourth processing unit, and the fourth processing unit is configured to determine the first duration according to the input load of the gas water heater. The larger the input load of the gas water heater, the smaller the first duration.
Specific limitations on the control device of the gas water heater can be found in the above limitations on the reignition method of the gas water heater, which are not described herein again. The modules in the control device of the gas water heater can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of reigniting a gas water heater, the gas water heater including a fan and a smoke evacuation system, the method comprising:
if accidental flameout of the gas water heater in the using process is detected, acquiring the state of the smoke exhaust system;
if the smoke exhaust system is in a dredging state, carrying out a reignition attempt lasting for a first ignition duration;
if the smoke exhaust system is in a blocking state, the rotating speed of the fan is increased, and if the rotating speed is increased, the smoke exhaust system enters a blocking dredging state, the first ignition duration is reduced, and a reignition attempt is performed.
2. The method of relighting a gas water heater as defined in claim 1, wherein said step of obtaining a state of said smoke evacuation system comprises:
acquiring the rotating speed of the fan;
if the rotating speed meets a first condition, judging that the smoke exhaust system is in the dredging state; the first condition is that the difference between the rotating speed and a first reference rotating speed is smaller than a first threshold value, and the first reference rotating speed is a theoretical rotating speed corresponding to a first control current;
and if the rotating speed does not meet the first condition, judging that the smoke exhaust system is in the blocking state.
3. The reignition method of a gas water heater according to claim 1, wherein the step of increasing the rotation speed of the fan if the smoke exhaust system is in a blockage state, and the step of decreasing the first ignition duration and performing the reignition attempt if the smoke exhaust system enters a blockage-cleared state after the rotation speed is increased comprises:
if the smoke exhaust system is in a blocking state, the control current of the fan is increased from a first control current to a second control current so as to increase the rotating speed, and if the rotating speed meets a second condition after the control current of the fan is the second control current, the smoke exhaust system is judged to enter the blocking and dredging state, the first ignition duration is reduced to be a second ignition duration, and a reignition attempt lasting for the second ignition duration is performed; the second condition is that the rotation speed is increased within a first speed increasing duration until the difference between the rotation speed and a second reference rotation speed is smaller than a second threshold value, and the second reference rotation speed is a theoretical rotation speed corresponding to the second control current.
4. The method of reigniting a gas water heater according to claim 3, wherein the blockage-unblocked state comprises a first blockage-unblocked state and a second blockage-unblocked state;
if the smoke exhaust system is in a blocked state, the control current of the fan is increased from a first control current to a second control current so as to increase the rotating speed, and if the rotating speed meets a second condition after the control current of the fan is the second control current, the steps of determining that the smoke exhaust system enters a blocked dredging state, reducing the first ignition duration to be a second ignition duration and performing a reignition attempt for the second ignition duration comprise:
if the smoke exhaust system is in a blocked state, the control current of the fan is increased from the first control current to the second control current so as to increase the rotating speed;
if the rotating speed meets the second condition after the control current of the fan is the second control current, the smoke exhaust system is judged to enter the first blockage dredging state, the first ignition duration is reduced to be the second ignition duration, and re-ignition attempt is carried out for the second ignition duration;
if the rotating speed does not meet the second condition after the control current of the fan is the second control current, the control current of the fan is increased from the second control current to a third control current, and if the rotating speed meets a third condition after the control current of the fan is the third control current, the smoke exhaust system is judged to enter the second blockage dredging state, the second ignition duration is reduced to be a third ignition duration, and a reignition attempt is performed for the third ignition duration; the third condition is that the rotation speed is increased within a second speed increasing period until the difference between the rotation speed and a third reference rotation speed is smaller than a third threshold value, and the third reference rotation speed is a theoretical rotation speed corresponding to the third control current.
5. The method of relighting a gas water heater as defined in claim 4, further comprising:
and if the reignition attempt lasting for the first ignition time period, the reignition attempt lasting for the second ignition time period or the reignition attempt lasting for the third ignition time period is not successful, controlling the gas water heater to stop.
6. The method of relighting a gas water heater as defined in claim 5, further comprising:
when the reignition attempt lasting for the first ignition duration is carried out, if the flame ion currents in the combustion chamber of the gas water heater are all lower than a fourth threshold value, determining that the reignition attempt lasting for the first ignition duration is unsuccessful;
when the reignition attempt lasting for the second ignition time period is performed, if the flame ion currents in the combustion chamber of the gas water heater are all lower than the fourth threshold value, determining that the reignition attempt lasting for the second ignition time period is unsuccessful;
when the reignition attempt lasting for the third ignition duration is performed, if the flame ion currents in the combustion chamber of the gas water heater are all lower than the fourth threshold, it is determined that the reignition attempt lasting for the third ignition duration is unsuccessful.
7. The method for reigniting a gas water heater according to claim 1, wherein the step of obtaining the state of the smoke evacuation system before detecting an unexpected flameout of the gas water heater during use further comprises:
and if the flame ion flow in the combustion chamber of the gas water heater is lower than a fifth threshold value in the first time length or the change value of the pressure of the smoke exhaust system in the second time length is larger than a sixth threshold value in the use process of the gas water heater, judging that the gas water heater is flameout unexpectedly in the use process.
8. The method of reigniting a gas water heater according to claim 7, wherein the first time period is determined based on a magnitude of an input load of the gas water heater, and wherein the first time period is smaller for a greater input load of the gas water heater.
9. The utility model provides a gas heater, includes fan and the system of discharging fume, its characterized in that still includes:
a controller connected to the fan, the controller comprising a memory storing a computer program and a processor implementing the steps of the reignition method according to one of the claims 1 to 8 when the computer program is executed by the processor.
10. The utility model provides a controlling means of gas heater, gas heater fan and exhaust system which characterized in that, controlling means includes:
the smoke exhaust system state acquisition module is used for acquiring the state of the smoke exhaust system if accidental flameout of the gas water heater in the using process is detected;
the first reignition module is used for performing reignition attempt lasting for a first ignition duration if the smoke exhaust system is in a dredging state;
and the second reignition module is used for increasing the rotating speed of the fan if the smoke exhaust system is in a blocked state, and reducing the first ignition duration and performing reignition attempt if the smoke exhaust system enters a blocked dredging state after the rotating speed is increased.
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