CN112833557A - Gas water heater and flame detection method thereof - Google Patents
Gas water heater and flame detection method thereof Download PDFInfo
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- CN112833557A CN112833557A CN202011044086.XA CN202011044086A CN112833557A CN 112833557 A CN112833557 A CN 112833557A CN 202011044086 A CN202011044086 A CN 202011044086A CN 112833557 A CN112833557 A CN 112833557A
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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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- 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
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/107—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using fluid fuel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Control Of Combustion (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The invention discloses a gas water heater and a flame detection method thereof, wherein the flame detection method comprises the following steps: s1, acquiring an ignition command; s2, detecting and storing the AD value M of the flame ion current at the current moment; s3, controlling the igniter to discharge and ignite, detecting the AD value x of the flame ion current in real time, judging whether x is smaller than M-d, if so, outputting a flame signal, wherein d is an adjustable limit value range for detecting flame and is larger than 0. The invention utilizes the characteristic that the AD value of the flame ion current is reduced after ignition, takes the AD value M of the flame ion current when an ignition command is received as a reference for judging whether flame exists, and simultaneously sets a limit value range d for detecting the flame to form a comparison value M-d for judging whether flame exists, so that a main control board can receive a signal that the flame exists only after the flame is successfully ignited every time a user uses a gas water heater, and the condition of false flame fault reporting in the prior art is avoided.
Description
Technical Field
The invention belongs to the technical field of gas equipment, and particularly relates to a gas water heater and a flame detection method thereof.
Background
The most basic requirement of the use of the gas water heater is that the gas water heater can be ignited and combusted normally, otherwise, the bathing experience is in an air talk.
In a humid environment, the insulativity of a flame induction needle, ceramic and the like is reduced, so that a flame signal is detected when a machine is not ignited for combustion, a false flame fault occurs, and the machine cannot be used. In wet weather, and in particular in the southern rainy weather, users are often heard complaining of the machine failing to operate on ignition.
The current schemes for detecting flames include the following three types:
the first scheme is as follows: and the computer board MCU adopts AD port single limit value detection.
When the AD port is used for detection, the detected AD value is compared with the set AD value for judging whether flame exists or not, so as to judge whether flame exists or not.
Scheme II: and the computer board MCU adopts AD port double-limit detection. And (3) detecting that the AD value is larger than the lower limit before ignition, considering that no flame exists, and igniting, considering that flame exists between the lower limit and the upper limit after ignition, and considering that flame does not exist when the AD value is larger than the upper limit.
The third scheme is as follows: and controlling the insulation and other parameters of the flame detection needle, the fixed ceramic and other components in high humidity.
For the first scheme, if the AD value is set too loosely when the existence of flame is judged, and when the weather is wet, the burner does not have flame but the main control board detects a signal of flame, so that ignition cannot be performed, and a false flame fault is reported; if the AD value is set too harsh when the existence of flame is judged, although the combustion water heater can normally control ignition and combustion, when the combustion working condition is not good, a signal that the main control board detects no flame although the burner still has flame appears, so that the proportional valve is controlled to be closed, and the bathing experience is poor.
And for the second scheme, the actual AD value is lower when no flame exists due to wet weather, at the moment, if the lower limit is too high, the actual AD value detected before ignition is lower, the main control board detects a signal that flame exists, and the ignition of the igniter is not controlled, so that the gas water heater reports false flame fault. The main control board can detect a signal without flame before ignition so as to normally ignite and burn, but when the flame is extinguished due to some reasons, the AD value of flame detection is still between the lower limit and the upper limit, and the main control board detects a signal with flame so as to control the proportional valve to be always opened, so that the detected flame fails, and the result is very dangerous.
For the third scheme, firstly, components with excellent high-humidity insulation performance are difficult to control and high in cost, and dust and oil smoke are deposited on the components after the gas water heater is used for a long time, so that the insulation performance is reduced when the gas water heater is wet, and at the moment, the defects of the first scheme and the second scheme exist.
The AD value of the judgement when having flame in above-mentioned scheme is the fixed value that sets up in advance, and to gas heater in humid environment, the insulating nature descends such as flame response needle and pottery and causes itself that appears when the actual AD value that detects is on the low side not have flame but can detect there is the flame signal to lead to the condition emergence occasionally of control ignition failure, seriously influence user's use experience.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a flame detection method, which aims to take the AD value of flame ion current when an ignition command is received as a basis for judging whether flame is detected, so that whether flame exists in a gas water heater every time the gas water heater is used can be really detected, and false flame faults cannot be reported.
Another object of the present invention is to provide a gas water heater, which adopts the above flame detection method.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method of flame detection comprising the steps of:
s1, acquiring an ignition command;
s2, detecting and storing the AD value M of the flame ion current at the current moment;
and S3, controlling the igniter to discharge and ignite, detecting the AD value x of the flame ion current in real time, judging whether x is smaller than M-d, if so, outputting a flame signal, wherein d is a limit range for detecting flame and is larger than 0.
Further, in the above-mentioned case,
step S3 further includes determining whether x is greater than or equal to M, and if so, outputting a signal that there is no flame.
Further, in the above-mentioned case,
further comprising the step of S4, the method comprises,
and S4, detecting the AD value x of the flame ion current in real time after the ignition is successful, judging whether x is smaller than M-d, and if yes, outputting a signal that the flame exists.
Further, in the above-mentioned case,
also included in step S4 is the step of,
and judging whether x is larger than or equal to M, if so, outputting a signal without flame, and controlling to shut down the fire.
Further, in the above-mentioned case,
further comprising the step of S5, the method comprises,
and S5, controlling to shut down the fire, judging whether the water flow exists, if so, acquiring the duration T of the water flow, judging whether the duration T of the water flow exceeds a set time threshold T, and if so, controlling to re-ignite.
Further, in the above-mentioned case,
the time threshold T is an adjustable parameter.
Further, in the above-mentioned case,
d is an adjustable parameter, and the value range of d is 5-20.
A gas water heater adopts the flame detection method.
After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.
1. The invention utilizes the characteristic that the AD value of the flame ion current is reduced after ignition, takes the AD value M of the flame ion current when receiving an ignition command as a reference for judging whether flame exists, and simultaneously sets an adjustable limit value range d for detecting flame to form a comparison value M-d for judging whether flame exists, so that a main control board can receive a signal that flame exists only after the flame is successfully ignited every time a user uses a gas water heater, and the condition of false flame fault reporting in the prior art is avoided.
2. The invention utilizes the AD value M of the flame ion current when receiving the ignition command as a comparison value for judging no flame, so that the gas water heater can output no flame signals in time when no flame exists, further control a proportional valve and the like to be closed, and improve the safety performance of the gas water heater.
3. According to the invention, the duration of the water flow after flameout due to no flame detection is judged to control the re-ignition work, so that the use experience of a user is improved.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic view of one embodiment of a flame detection method of the present invention;
FIG. 2 is a schematic view of another embodiment of the flame detection method of the invention;
FIG. 3 is a schematic view of yet another embodiment of the flame detection method of the invention.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred devices or elements must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should 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; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 3, the present invention provides a gas water heater and a flame detection method thereof. In detail, the gas water heater generally comprises a main control board, a water flow sensor, an igniter, a burner, a fan, a proportional valve and the like. The main control board is a computer board MCU for overall control of the operation of the gas water heater. When a user uses the gas water heater, the water flow sensor detects water flow information and feeds the water flow information back to the main control board, and after the main control board receives the water flow information, the main control board controls the igniter to discharge and the opening degree of the proportional valve to complete ignition work.
Specifically, whether ignition is successful is based on whether a flame is detected. As shown in fig. 1, the flame detection method of the present invention includes the steps of:
s1, acquiring an ignition command;
s2, detecting and storing the AD value M of the flame ion current at the current moment;
and S3, controlling the igniter to discharge and ignite, detecting the AD value x of the flame ion current in real time, judging whether x is smaller than M-d, if so, outputting a flame signal, wherein d is a limit range for detecting flame and is larger than 0.
When the main control board receives an ignition command, the invention detects the AD value M of the flame ion current at the current moment and stores the AD value M of the flame ion current at the current moment as a basis for judging whether the ignition is successful. It will be appreciated that the AD value M of the flame ion current at the present moment is necessarily a number greater than zero. And then controlling the igniter to discharge and ignite, detecting the AD value x of the flame ion current in real time, judging whether the AD value x of the flame ion current at the moment is smaller than M-d, if so, determining that flame exists, and outputting a signal that the flame exists and the ignition is successful.
Wherein d is an adjustable limit range for detecting flames, and d is a number greater than zero. In a preferred scheme, the value range of d is 5-20, and in a more preferred scheme, the value range of d is 10-15.
In the scheme, the characteristic that the AD value of the flame ion current is reduced after ignition is utilized, the AD value M of the flame ion current when an ignition command is received is used as a reference for judging whether flames exist, and an adjustable limit value range d for detecting the flames is arranged to form a comparison value M-d for judging whether the flames exist, so that a main control board receives a signal that the flames exist only after the flames are successfully ignited every time a user uses the gas water heater, and the condition that false flame faults are reported in the prior art is avoided.
In a further aspect, step S3 further includes determining whether x is greater than or equal to M, and if so, outputting a signal that there is no flame.
In detail, in the process of igniter discharging and proportional valve opening adjusting, there may be a case of unsuccessful ignition, and at this time, because of unsuccessful ignition, when the AD value x of the flame ion current detected in real time is greater than or equal to the stored AD value M of the flame ion current, a signal of no flame, that is, a signal of unsuccessful ignition is output, so that the main control board controls the proportional valve to close, so as to avoid the occurrence of gas leakage.
In the above scheme, since the AD value of the flame ion current of the gas water heater is different according to different environments where the gas water heater is located, the AD value M of the flame ion current when the ignition command is received is used as a comparison value for judging that no flame exists, so that the comparison value is a comparison value which changes along with the change of the environment.
In a further aspect, as shown in fig. 2, the flame detection method of the present invention further includes step S4, after the ignition is successful, detecting an AD value x of the flame ion current in real time, and determining whether x is smaller than M-d, if so, outputting a signal indicating that there is a flame. And judging whether x is larger than or equal to M, if so, outputting a signal without flame, and controlling flameout.
In detail, after the main control board outputs a flame signal, it indicates that the ignition is successful, and at this time, the main control board can adjust the opening of the proportional valve in real time according to the water flow signal of the water flow sensor so as to adjust the size of the flame, so that the gas water heater can operate according to the actual heat requirement of the user.
During the operation of the gas water heater, the AD value x of the flame ion current is a variable value which may be greater than M-d and less than M, or less than M-d, or greater than or equal to M according to different working conditions.
In principle, the AD value x of the flame ionization current should be less than M as long as there is a flame.
When the user's heat demand increases, it is still necessary to detect the AD value x of the flame ion current in real time. When the opening of the control proportional valve is increased, the flame is increased, the AD value x of the flame ion current detected in real time tends to decrease, when the AD value x of the flame ion current detected in real time is smaller than M-d, a command for controlling the increase of the flame is implemented, and at the moment, a signal that the flame exists is output.
When the heat demand of a user is reduced, the opening degree of the control proportional valve is reduced, the flame is reduced, and the AD value x of the flame ion current detected in real time tends to increase. It may be that when the AD value x of the flame ion current detected in real time is greater than M-d and less than M, a command for controlling the flame reduction is executed, and although the flame is reduced, there is still a flame, and therefore, a signal that there is a flame is still output. It is also possible that during the reduction of the opening of the control proportional valve, the AD value x of the flame ion current detected in real time is smaller than M-d, indicating that the flame has been reduced relative to before the control, but is still maintained at a relatively large level.
When special conditions are met, for example, in windy weather, wind flows backwards from the smoke exhaust pipe to blow out flame of the burner, at the moment, a user still has heat demand, the water flow sensor still can detect the flow of the water flow, and therefore the main control board still can control the proportional valve to open to supply air for the burner. However, at this time, the flame is extinguished, and if the signal of no flame is not fed back to the main control panel in time, a dangerous situation will occur.
Therefore, when the AD value x of the flame ion current detected in real time tends to increase, the flame is reduced, when the AD value x of the flame ion current detected in real time is larger than or equal to M, no flame is considered, a signal without flame is output to the main control board, and the main control board can further control fire shutting according to the signal command without flame, for example, a proportional valve is closed, so that the use safety performance of the gas water heater is improved.
In a further aspect, as shown in fig. 3, the flame detection method of the present invention further includes step S5, after controlling to shut down the fire, determining whether there is an effluent water flow, if yes, obtaining a duration time T of the effluent water flow, determining whether the duration time T of the effluent water flow exceeds a set time threshold T, and if yes, controlling to re-ignite.
In detail, when the user still uses the gas water heater after the fire is turned off due to the fact that the flame cannot be detected in a special situation, the water flow sensor still can detect the signal of the water flow, at the moment, the duration time T of the water flow is obtained, and when the duration time T of the water flow exceeds the set time threshold value T, the ignition work is automatically controlled again.
At this time, even if the weather is wet, the insulation performance of the flame detection needle and the fixed ceramic and other components becomes worse, the heat reduces the humidity after the combustion process, and the AD value of the detected actual flame ion current is increased under the flameless state, so that a flameless signal is output, and the flame detection can be re-ignited, and finally the flame detection accuracy is ensured.
In a preferred embodiment, the time threshold T is an adjustable parameter.
The time threshold T may be adjusted by user input or selected by the user based on values set in the gas water heater.
In detail, the user can set the time threshold T according to the actual demand of the user, so that the performance of the gas water heater is more humanized. The time threshold T may also be integrated in the main control board of the gas water heater, setting it to adjustable parameters with gradients, e.g. 3s, 5s, 10s, etc.
The gas water heater adopts the flame detection method.
On the premise of not increasing the cost of the gas water heater, the invention takes the AD value M of the flame ion current when receiving an ignition command as a reference for judging whether flame exists by utilizing the characteristic that the AD value of the flame ion current is reduced after ignition, and simultaneously, an adjustable limit value range d for detecting the flame is set to form a comparison value M-d for judging whether the flame exists, so that a main control board can receive a signal that the flame exists only after the flame is successfully ignited when a user uses the gas water heater every time, the gas water heater can be ignited under the condition of different humidity environments, the condition of reporting false flame faults in the prior art is avoided, and the performance of the gas water heater is improved.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A method of flame detection, comprising: the method comprises the following steps:
s1, acquiring an ignition command;
s2, detecting and storing the AD value M of the flame ion current at the current moment;
and S3, controlling the igniter to discharge and ignite, detecting the AD value x of the flame ion current in real time, judging whether x is smaller than M-d, if so, outputting a flame signal, wherein d is a limit range for detecting flame and is larger than 0.
2. A flame detection method as claimed in claim 1, wherein:
step S3 further includes determining whether x is greater than or equal to M, and if so, outputting a signal that there is no flame.
3. A flame detection method as claimed in claim 2, wherein: further comprising the step of S4, the method comprises,
and S4, detecting the AD value x of the flame ion current in real time after the ignition is successful, judging whether x is smaller than M-d, and if yes, outputting a signal that the flame exists.
4. A flame detection method as claimed in claim 3, wherein: also included in step S4 is the step of,
and judging whether x is larger than or equal to M, if so, outputting a signal without flame, and controlling to shut down the fire.
5. A flame detection method as claimed in claim 4, wherein: further comprising the step of S5, the method comprises,
and S5, controlling to shut down the fire, judging whether the water flow exists, if so, acquiring the duration T of the water flow, judging whether the duration T of the water flow exceeds a set time threshold T, and if so, controlling to re-ignite.
6. A flame detection method as claimed in claim 5, wherein:
the time threshold T is an adjustable parameter.
7. A flame detection method according to any of claims 1-6, wherein:
d is an adjustable parameter, and the value range of d is 5-20.
8. A gas water heater employing the flame detection method of any one of claims 1-7.
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Application publication date: 20210525 |