CN102080878A - Draught fan control method and device of gas equipment - Google Patents
Draught fan control method and device of gas equipment Download PDFInfo
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- CN102080878A CN102080878A CN2009102465892A CN200910246589A CN102080878A CN 102080878 A CN102080878 A CN 102080878A CN 2009102465892 A CN2009102465892 A CN 2009102465892A CN 200910246589 A CN200910246589 A CN 200910246589A CN 102080878 A CN102080878 A CN 102080878A
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Abstract
The invention provides a draught fan control method of gas equipment, comprising the following steps of: A. determining the current working state of the gas equipment; B. controlling the rotation speed of a draught fan according to the current working state of the gas equipment: B1. judging that the inside combustion air quantity of the gas equipment in combusting is overlarge in the current working state, reducing the rotation speed of the draught fan; B2. judging that the gas equipment is in a normal combusting working state or passable combusting working state, maintaining the current rotation speed of the draught fan; B3. judging that the gas equipment is in a possible incomplete combusting working state, increasing the rotation speed of the draught fan; and B4. judging that the gas equipment is in an exhaust blockage working state, stopping supplying gas for the gas equipment. The invention also provides a corresponding control device. By using the method and the device provided by the invention, the rotation speed of the draught fan is regulated when the external air pressure is changed, so that singly closing the gas is avoided and the convenience for users is increased.
Description
Technical field
The present invention relates to combustion gas control technology field, be meant a kind of blower control method and device of gas-fired equipment especially.
Background technology
Show gas heater as Fig. 1, mainly comprise: water route 10; Be the combustion apparatus of water route 10 heating, combustion apparatus comprises combustion gas intake valve 11 and burner and heat-exchange system 12; The blower fan 13 that communicates with burner and heat-exchange system 12 paths, and the wind output channel that communicates with this wind path; The control device 14 of control burner burning blower fan 13; The bracing frame 15 of fixing above-mentioned each device.
When gas heater runs into the situation that extraneous blast exhaust outlet excessive or wind output channel stopped up, if be in ignition process, then gas heater can appearance point the situation of missing of ignition or ignition deflagrating of hot; If be in the normal combustion process, then gas heater burning can occur and suppressed and produce imperfect combustion, causes occurring flue gas to exceed standard fray-out of flame under the serious situation.As seen, above-mentioned situation can have a strong impact on the security that the user uses.
In order to reach the opposing purpose that extraneous blast is excessive or exhaust outlet is stopped up, Chinese patent 99235472.2 discloses a kind of safety water heater, its can detect that flue stops up or blast is excessive, blower fan stall, stall and rotating speed cross that the control gas valve discharges when low, closes combustion gas to guarantee the safe in utilization of water heater.Can only close combustion gas but this methodological function is single, and the convenience that positive closing combustion gas meeting makes the user use reduces greatly.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of blower control method and device of gas-fired equipment, to adjust rotation speed of fan when extraneous blast changes, avoids the single combustion gas of closing, and improves the convenience that the user uses.
The blower control method of gas-fired equipment provided by the invention comprises step:
A, determine gas-fired equipment work at present state;
B, according to the gas-fired equipment work at present state determined control rotation speed of fan, comprising:
When B1, gas-fired equipment are in the current excessive duty of the internal-combustion air quantity in when burning, reduce rotation speed of fan;
B2, gas-fired equipment be in normal combustion or the burning still can duty the time, keep the current rotating speed of blower fan;
When B3, gas-fired equipment are in unburnt duty, increase rotation speed of fan; Or,
When B4, gas-fired equipment are in the duty of exhaust obstruction, close the supply of gas-fired equipment combustion gas.
By last, when extraneous blast changes, adjust rotation speed of fan, avoid the single combustion gas of closing, and adopt the mode of adjusting rotation speed of fan make gas-fired equipment arrive normal combustion or burning still can state, can not interrupt the use of user, improve the convenience that the user uses gas-fired equipment.And, when gas heater is in the state of exhaust obstruction, close the safety of the supply bond of gas-fired equipment combustion gas earlier to the user.
Wherein, the described definite gas-fired equipment work at present state of steps A comprises: the function that preestablishes gas-fired equipment blower fan electric current or the power gas-fired equipment duty corresponding with rotating speed; Determine gas-fired equipment work at present state according to the electric current of the current blower fan that is detected or power and rotating speed.
By last, realize implementing easier to the determining of equipment work at present state by detecting power of fan, electric current, rotating speed.
Blower fan control step when wherein also comprising the gas-fired equipment starting ignition before the B after steps A comprises:
B02, judge gas-fired equipment be in can normal combustion maybe can burn still can duty the time, keep the current rotating speed of blower fan, the gas-fired equipment ignition trigger;
B03, judging that gas-fired equipment is in can be unburnt during duty, increases rotation speed of fan, returns steps A;
B04, judge when gas-fired equipment is in the duty that exhaust stops up, close the supply of gas-fired equipment combustion gas.
By last, can be implemented in the ignition process when changing and adjust rotation speed of fan, the user security under guarantee to light a fire success and the exhaust outlet obstruction situation according to extraneous blast.
Wherein, also comprise behind the step B3: judge whether rotation speed of fan surpasses the rotating speed higher limit, if then close gas-fired equipment.
By last, can avoid the blower fan overload operation, protection equipment also ensures user security.
Wherein, also comprise: behind execution in step B1 or the B3, or behind the B03, count carrying out number of times separately respectively; Judge whether to reach the threshold value of carrying out time counting number separately,, otherwise return steps A if then close gas-fired equipment.
By last, can realize repeatedly adjustment, progressively to reach gas-fired equipment normal combustion or incendivity state still, the preferable gas-fired equipment normal combustion state of adjusting to rotation speed of fan.
Wherein, also comprise after closing gas-fired equipment: restart gas-fired equipment, and this number of starts is counted; Judge whether to reach number of starts threshold value,, otherwise return steps A if then close gas-fired equipment.
By last, can be implemented in adjustment do not make yet gas-fired equipment arrive normal combustion or burning still can state status under, preferable adjusts under the gas-fired equipment normal combustion state not yet, gas-fired equipment restarts again, to realize work as external influence factor, can realize after the excessive or exhaust outlet obstruction situation disappearance that as blast gas-fired equipment restarts automatically.
The fan controller of the gas-fired equipment that the present invention also provides comprises:
Rotation speed of fan detecting unit 410 is used to detect the rotating speed of blower fan;
Blower fan current/power detecting unit 420 is used to detect the current/power of blower fan;
Single-chip Controlling unit 430, store the different operating state of the gas-fired equipment of the different current/power correspondences of blower fan, be used for detected value according to rotation speed of fan detecting unit 410 and blower fan current/power detecting unit 420, determine the duty of institute's canned data correspondence, and send control signal;
Rotation speed of fan control module 440 is used for the control signal control rotation speed of fan according to Single-chip Controlling unit 430.By last, when detecting unit detects extraneous blast and changes, adjust rotation speed of fan by the blower fan control module, make gas-fired equipment arrive normal combustion or burning still can state, can not interrupt the use of user to gas-fired equipment, improve the convenience that the user uses.
Wherein, also can comprise gas electromagnetic valve control module 460, be used for switch according to the control signal control gas electromagnetic valve of Single-chip Controlling unit 430.
By last, when gas heater is in the state of exhaust obstruction, can control the supply of closing the gas-fired equipment combustion gas earlier, can effectively avoid of the influence of blower fan control procedure to the fuel gas buring process, also secure to user security.
Wherein, also comprise: gas ratio valve aperture control module 450 is used for the aperture size according to the control signal control gas ratio valve of Single-chip Controlling unit 430.
In a word, by the present invention gas heater is carried out whole process detection and monitoring at the state of igniting and normal course of operation, especially cross when being more or less than normal value and causing the imperfect combustion state at blast, adjust rotation speed of fan and guarantee the combustion system normal combustion, and when the exhaust blocked state, close the gas heater gas supply to guarantee safety.Specifically, gas heater the igniting and running in, be subjected under the extraneous blast situation, when gas heater is in imperfect combustion, utilize the method that increases rotation speed of fan to compensate the waste gas that burning produces, guarantee the normal combustion of gas heater, and then effectively control the imperfect combustion situation of exhaust fuel gas water heater, guarantee user's safety with this.And, in igniting and running, when the exhaust of gas and hot water is stopped up, not only cut off the supply burn-out of combustion gas at gas heater, guarantee user's safety with this.
Description of drawings
Fig. 1 is system's composition diagram of gas heater;
Fig. 2 water heater working function of state schematic diagram;
Fig. 3 is the graph of a relation of gas heater heat and rotation speed of fan;
Fig. 4 is a gas heater blower fan control flow chart;
Fig. 5 is the fan controller schematic diagram of gas-fired equipment.
The specific embodiment
Because the gas heater blower fan links to each other with the external world by wind output channel, therefore when running into the excessive or wind output channel exhaust outlet obstruction of extraneous blast, the blower motor electric current or the power of water heater can descend, thus, the electric current of blower fan self or power can change with the blocked state of extraneous blast or exhaust outlet.The present invention is promptly according to the current working state that water heater is caused by extraneous blast or exhaust stopping state is judged in the monitoring of blower fan electric current or power, and adjust air quantity by the rotating speed of adjusting blower fan, make the inner and extraneous blast of burner of water heater keep dynamic equilibrium, guarantee the combustion gas and suitable the mixing of air of gas combustion apparatus, reach good burning condition, guarantee the gas heater normal combustion, thereby avoided the monistic combustion gas of closing.
In order to confirm the state that water heater is current by blower fan electric current or power, need preestablish the corresponding relation of electric current or power and water heater working state, this corresponding relation can obtain by experiment, show water heater working function of state schematic diagram under different electric currents and the motor speed as Fig. 2, wherein the curve A among the figure, B, C, D are for dividing the critical curve of gas heater different operating state.
Wherein, igniting is during after-combustion, and blower fan its electric current (or power) under certain rotating speed is positioned at first area on the curve A value 1. the time, and the expression gas heater is in the current excessive state of internal-combustion air quantity;
Be positioned on the curve B value second area under the curve A 2. the time, the expression gas heater be in can normal combustion state;
Be positioned on the curve C value the 3rd zone under the curve B 3. the time, the expression gas heater be in can burn still can state;
Be positioned on the curve D value the 4th zone under the curve C 4. the time, the expression gas heater is in can unburnt state;
Be positioned at the 5th zone under the curve D value 5. the time, the expression gas heater is in the state that exhaust is stopped up.
Wherein, the drafting of Fig. 2 foundation is referring to the gas heater heat shown in Fig. 3 and the graph of a relation of rotation speed of fan, and wherein, P0 is the combustion heat value curve map under the standard blast, and P1 is the combustion heat value curve map that has under the wind state.When gas heater is in the state of standard blast, blower fan is Q with the air quantity of A1 rotation speed operation generation and the heat of combustion gas mixing burning generation, when the external world the excessive or exhaust outlet of blast occurs and stops up, power (or electric current) and rotating speed can descend, if want gas heater will keep identical heat, need the rotating speed of blower fan is increased to A2, could guarantee that the air quantity that provides identical guarantees burning.According to power (or electric current) under these figure principle measurement different situations and the relation between the rotating speed, promptly draw out Fig. 2.
Below, referring to the gas heater blower fan control flow chart shown in Fig. 4, the present invention will be described, may further comprise the steps:
Step 300: at first confirm and write down that gas heater is current still to be in combustion process after the igniting for igniting.Wherein can be by judging whether that being in the electronic pulse ignition process judges, after gas heater detects and reaches certain discharge, water heater starts electronic pulse ignition, control system is opened magnetic valve, this process is ignition process, after lighting a fire successfully, the flame inductive needle detects flame combustion, then stops electronic pulse ignition and enters the burning normal processes.
Step 301: in the process of gas heater igniting or normal combustion, water heater detects rotation speed of fan and electric current (or power).
Step 302:, determine water heater present located duty zone by rotation speed of fan that is detected and electric current (or power) according to water heater working function of state schematic diagram as shown in Figure 2.
Step 303: the water heater present located duty Region control rotation speed of fan according to being determined comprises:
3031, be in combustion process after the igniting,, reduce rotation speed of fan, to reduce gas heater internal-combustion air quantity when the water heater working state is in the first area 1. the time;
2. or the 3rd zone 3. the time 3032, be in second area when the water heater working state, the current rotating speed of blower fan is not done control, keep the current rotating speed of blower fan; This step can be applicable to the ignition process and the combustion process of water heater;
3033, be in the 4th zone 4. the time when the water heater working state, increase rotation speed of fan, to increase gas heater internal-combustion air quantity; This step can be applicable to the ignition process and the combustion process of water heater;
3034, be in the 5th zone 5. the time when the water heater working state, directly close gas supply and water heater.This step can be applicable to the ignition process and the combustion process of water heater.
In addition, after closing gas supply, can control blower fan earlier and adopt closing of peak power compartment and start, impact wind output channel, stop up thing to attempt the removing wind output channel exhaust outlet to form the pulsed air draft.Need to prove that this process is optional.
Step 304: when execution in step 3031,3033 or 3034, respectively the execution number of times of these three steps is counted, and judge in first setting-up time, in 1 minute, when surpassing the threshold value of counting separately, promptly represent in the setting-up time adjustment blower fan of set point number fail to make the water heater working recovering state to second area 2. or the 3rd zone 3. the time (2. preferable returns to second area), close gas heater gas supply and blower fan, carry out next step; If do not reach described threshold value, perhaps the rapid execution of previous step is step 3032, then returns step 301.
Be understood that, also can the time do not set, and only counting is controlled.Second and third setting-up time that hereinafter relates in like manner repeats no more
Step 305: after second setting-up time, after 2 minutes, return step 301, start water heater igniting and subsequent step.And the igniting number of times counted, if in the 3rd setting-up time, in 5 minutes, surpass igniting number of times thresholding, then stop this flow process.Whether this step is promptly opened after water heater is closed the back certain hour automatically once more, disappear to judge the extraneous factor fault, and when opening above set point number, promptly do not judge when the extraneous factor fault disappears and close.Need to prove that this step can be provided with as required, for example avoid the unlatching of water heater for the sake of security, can remove this step.
Wherein, for above-mentioned steps 3034, for intensification pulse formula air draft impulsive force, can the controllable gate body that can open and close as venetian blind type be set in inside, air channel, and be controlled at and close this body before fan starting reaches peak power, open this body when blower fan arrives peak power, form the pulsed air draft to cooperate blower fan; Certainly, if make blower fan remain on peak power work, only the opening and closing by the controllable gate body can form the pulsed air draft equally, but also have avoided the frequent starting of blower fan, effectively protect blower fan.
In addition, one gas cavity that is communicated with can also be set at the upper position in the inboard air channel of door body, the one cavity dividing plate that constant weight is arranged moving up and down is set in the cavity, the cavity dividing plate is divided into two parts up and down with gas cavity, when the door body is closed, the gas pressure that blower fan is discharged will move on the dividing plate, compaction cavum top gas, when the door body is opened, the gas that dividing plate can fall the cavity bottom also is pressed into exhaust outlet simultaneously, blower fan wind-force and the air draft impulsive force that forms simultaneously from the wind-force of cavity are stronger like this, and more effective impact is removed exhaust outlet and stopped up thing.
Wherein, remove the step that exhaust outlet stops up thing, can offer user's start button separately, start exhaust outlet when detecting the user and pressing this start button and stop up the step that thing is removed.
Below in conjunction with the start-up course of water heater, contrast accompanying drawing 2 and 4 is an example with the electric current that detects blower fan, and said method of the present invention is described in detail, may further comprise the steps:
At first, in the process that gas heater starts, start blower fan earlier, gas heater can detect blower fan electric current I and rotating speed automatically.
Then, show the function schematic diagram according to the water heater working state as shown in Figure 2 that sets in advance, determine water heater present located duty zone by rotation speed of fan that is detected and electric current, what at first illustrate here is, in ignition process, can not occur water heater usually and be in the first area 1., therefore determine that current duty of living in zone comprises: under measured rotating speed, when the electric current of blower fan is IC＜I, then be defined as being in can light a fire successful second area 2. or the 3rd zone 3.; When the electric current of blower fan is ID＜I≤IC, then be defined as being in the 4th zone 4.; When the electric current of blower fan is I≤ID, then be defined as being in the 5th zone 5..
Then, according to the water heater working state region of being determined, rotation speed of fan is adjusted in control, comprising:
2. or the 3rd zone 3. the time judge to be in ignition process, be in second area, show that the shutoff situation of blast situation that this moment is extraneous or exhaust outlet is little to the influence of igniting situation, the current rotating speed of blower fan is kept in the success of can lighting a fire;
Judge and to be in the 4th zone 4. the time, show that the serious or exhaust outlet of the extraneous blast of this moment has certain obstruction, igniting may cause detonation, then the rotating speed of blower fan is carried out N time continuously by control system and adjust, increase rotating speed R0 rpm (Revolutions Per minute, rev/min) at every turn, be adjusted to IC＜I with electric current with blower fan, 2. or the 3rd zone 3. (preferable, as to adjust to second area 2., i.e. the zone of normal combustion) be about to the water heater working state and adjust to second area; If adjust the back failure for N time, then close blower fan;
Judge to be in the 5th zone 5. the time that show that the very serious or exhaust outlet of the extraneous blast of this moment is subjected to serious obstruction, igniting easily causes detonation, then directly closes blower fan, cancellation water heater ignition operation.Certainly, also can be as described above the pulsed exhaust method attempt impacting exhaust outlet and stop up thing, and the electric current of blower fan is adjusted to IC＜I, 2. or the 3rd zone 3. (preferable, as to adjust to second area 2.) be about to the water heater working state and adjust to second area; If repeatedly attempt failure, then close blower fan.
Then, when as above adjust to second area 2. or the 3rd zone 3. (preferable, adjust to second area 2.) time, then ignition, after gas heater was lighted a fire successfully, gas heater confirmed that to parameters gas ratio valve will be opened PWM and set, enter the normal combustion state, the electric current of blower fan is adjusted to IB≤I≤IA (promptly adjusting to second area 2.).
Therefore, 2. or the 3rd zone 3. the time, do not carry out ignition operation not adjusting to second area, therefore can effectively avoid lighting a fire be difficult to the possibility of success and detonation, has guaranteed user's safety.
Again in conjunction with in the water heater combustion process, contrast accompanying drawing 2 and 4 is an example with the electric current that detects blower fan, and said method of the present invention is introduced, and may further comprise the steps below:
At first, when combustion system was normally moved, control system can be monitored the variation of the rotating speed and the electric current of blower fan.
Then, show the function schematic diagram, determine water heater present located duty zone by rotation speed of fan that is detected and electric current according to the water heater working state as shown in Figure 2 that sets in advance.
Then, according to the water heater working state region of being determined, rotation speed of fan is adjusted in control, comprising:
Judge that gas heater operates in the first area 1. the time, the burning air quantity that shows gas heater inside is excessive, in such cases, control system is adjusted the electric current of blower fan, allow the rotating speed of blower fan reduce R0 rpm at every turn, operate in second area 2. the time up to detecting water heater, then stop adjustment rotation speed of fan; General, arrive this regional reason and be, extraneous blast is excessive, and water heater is in the imperfect combustion state, and blower fan begins to increase rotating speed, but external wind pressure suddenly disappears midway;
Judge that gas heater operates in second area 2. the time, show that gas heater is in the state of energy normal combustion, this moment, the blast in the external world was very faint, the exhaust outlet of gas and hot water is subjected to slight obstruction in other words, the waste gas that burning is produced can emit smoothly, in such cases, keep current rotation speed of fan;
Judge that gas and hot water operates in the 3rd zone 3. the time, show gas heater be in can burn still can state, operate under the strong slightly state of extraneous blast this moment, the exhaust outlet of gas and hot water is subjected to big slightly obstruction in other words, the waste gas that this moment, burning was produced is subjected to a little obstructions when discharging, but on the performance of discharging burnt gas, still in the acceptable scope,, keep current rotation speed of fan in such cases;
Judge that gas and hot water operates in the 4th zone 4. the time, show that gas heater is in the unburnt fired state of meeting, this moment, gas heater was in the very big state of extraneous blast, the exhaust outlet of gas heater is subjected to serious obstruction in other words, the fired state of this moment is bad, gas heater is in unburnt state, after control system detects this kind signal, under the control of program, wind speed to blower fan is adjusted, and increases R0rpm at every turn, adjusts N time at most, 2. or the 3rd zone 3. (preferable, as to adjust to second area 2.) fired state of this moment is adjusted to second area; If the N time adjustment all fails to reach second area 2., then cut off gas handling system, stop to the gas heater air feed; In addition, in the process that rotating speed is adjusted, as the limit speed Rmax that adjusts to blower fan, even no show the N time, control system also will be cut off air supply system simultaneously this moment, show that gas heater can not good operation, continue to use, will user's safety be impacted;
Judge that gas heater operates in the 5th zone 5. the time, show that gas heater is in the state that exhaust is stopped up, this moment, the blast in the external world was big unusually, perhaps the exhaust outlet of gas heater is stopped up by foreign matter, and the combustion position very severe of this moment is when control system detects this kind signal of the electric current of blower fan or power, control module makes a determination to the detection signal of this moment, stop to carry out the supply of combustion gas, and then burn-out, close the supply of blower fan and combustion gas.Be understood that, optionally can adopt above-mentioned described pulsed exhaust method to attempt impacting exhaust outlet and stop up thing.
By last, can be in the gas water heater working process, 2. or the 3rd zone 3. (preferable, as to adjust to second area 2.) adjust to second area, and enter the 5th zone and close combustion gas 5. the time detecting, guaranteed user's safety.
Also show the fan controller of the gas-fired equipment of realizing the inventive method as Fig. 5, comprising:
Rotation speed of fan detecting unit 410 is used to detect the rotating speed of blower fan;
Blower fan current/power detecting unit 420 is used to detect the current/power of blower fan;
Single-chip Controlling unit 430, store the different operating state of the gas-fired equipment of the different current/power correspondences of blower fan, be used for detected value according to rotation speed of fan detecting unit 410 and blower fan current/power detecting unit 420, determine the duty of institute's canned data correspondence, and send control signal;
Rotation speed of fan control module 440 is used for the control signal control rotation speed of fan according to Single-chip Controlling unit 430.Concrete control method repeats no more referring to above step 303 is described.
Gas ratio valve aperture control module 450 is used for the aperture size according to the control signal control gas ratio valve of Single-chip Controlling unit 430.
Gas electromagnetic valve control module 460 is used for the switch according to the control signal control gas electromagnetic valve of Single-chip Controlling unit 430.
When this device is specifically implemented, when the blast in the external world changes or exhaust outlet when obstruction is arranged, the rotating speed of blower fan will change, detect by rotation speed of fan detecting unit 410, and by the current current/power of blower fan current/power detecting unit 420 detection blower fans, Single-chip Controlling unit 430 compares with the value that is stored in the system through the calculating of program then, in time the output corresponding control signal offers rotation speed of fan control module 440, gas ratio valve aperture control module 450 or gas electromagnetic valve control module 460 are controlled the rotating speed of blower fan respectively, the aperture of gas ratio valve and the switch of gas electromagnetic valve.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., for example above-mentioned water heater working state is determined by the blower fan electric current, also can load onto special being used to and detect the extraneous blast of blower fan and the detecting unit of stopping state on gas heater.Though and for example the present invention is that example describes with the gas heater, can be used for other gas-fired equipments equally, as the induced-draft fan of gas-cooker, lampblack absorber etc., these all should be included within protection scope of the present invention.
Claims (9)
1. the blower control method of a gas-fired equipment is characterized in that, comprises step:
A, determine gas-fired equipment work at present state;
B, according to the gas-fired equipment work at present state determined control rotation speed of fan, comprising:
B1, when judging the current excessive duty of internal-combustion air quantity when gas-fired equipment is in burning, reduce rotation speed of fan;
B2, judge gas-fired equipment be in can normal combustion maybe can burn still can duty the time, keep the current rotating speed of blower fan;
B3, judging that gas-fired equipment is in can be unburnt during duty, increases rotation speed of fan; Or,
B4, judge when gas-fired equipment is in the duty that exhaust stops up, close the supply of gas-fired equipment combustion gas.
2. method according to claim 1 is characterized in that, the described definite gas-fired equipment work at present state of steps A comprises:
Preestablish the function of gas-fired equipment blower fan electric current or the power gas-fired equipment duty corresponding with rotating speed;
Determine gas-fired equipment work at present state according to the electric current of the current blower fan that is detected or power and rotating speed.
3. method according to claim 1 and 2 is characterized in that, the blower fan control step when also comprising the gas-fired equipment starting ignition before the B after steps A comprises:
B02, judge gas-fired equipment be in can normal combustion maybe can burn still can duty the time, keep the current rotating speed of blower fan, the gas-fired equipment ignition trigger;
B03, judging that gas-fired equipment is in can be unburnt during duty, increases rotation speed of fan, returns steps A;
B04, judge when gas-fired equipment is in the duty that exhaust stops up, close the supply of gas-fired equipment combustion gas.
4. according to claim 1 or 3 described methods, it is characterized in that, also comprise behind step B3 or the B03: judge whether rotation speed of fan surpasses the rotating speed higher limit, if then close gas-fired equipment.
5. according to claim 1 or 4 described methods, it is characterized in that, also comprise:
Behind execution in step B1 or the B3, or behind the B03, count carrying out number of times separately respectively;
Judge whether to reach the threshold value of carrying out time counting number separately,, otherwise return steps A if then close gas-fired equipment.
6. method according to claim 4 is characterized in that, also comprises after closing gas-fired equipment:
Restart gas-fired equipment, and this number of starts is counted;
Judge whether to reach number of starts threshold value,, otherwise return steps A if then close gas-fired equipment.
7. the fan controller of a gas-fired equipment is characterized in that, comprising:
Rotation speed of fan detecting unit (410) is used to detect the rotating speed of blower fan;
Blower fan current/power detecting unit (420) is used to detect the current/power of blower fan;
Single-chip Controlling unit (430), store the different operating state of the gas-fired equipment of the different current/power correspondences of blower fan, be used for detected value according to rotation speed of fan detecting unit (410) and blower fan current/power detecting unit (420), determine the duty of institute's canned data correspondence, and send control signal;
Rotation speed of fan control module (440) is used for the control signal control rotation speed of fan according to Single-chip Controlling unit (430).
8. device according to claim 7 is characterized in that, also comprises:
Gas electromagnetic valve control module (460) is used for the switch according to the control signal control gas electromagnetic valve of Single-chip Controlling unit (430).
9. device according to claim 8 is characterized in that, also comprises:
Gas ratio valve aperture control module (450) is used for the aperture size according to the control signal control gas ratio valve of Single-chip Controlling unit (430).
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| CN103090548A (en) * | 2013-02-01 | 2013-05-08 | 广东万和新电气股份有限公司 | Protection device of gas water heater flue blockage and detecting method thereof |
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