CN106766220A - A kind of gas water heater control system of air quantity self adaptation - Google Patents
A kind of gas water heater control system of air quantity self adaptation Download PDFInfo
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- CN106766220A CN106766220A CN201611184815.5A CN201611184815A CN106766220A CN 106766220 A CN106766220 A CN 106766220A CN 201611184815 A CN201611184815 A CN 201611184815A CN 106766220 A CN106766220 A CN 106766220A
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- wind pressure
- pressure sensor
- blower fan
- gas heater
- output frequency
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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
Abstract
The present invention discloses a kind of gas water heater control system of air quantity self adaptation, it is characterized in that, the wind pressure sensor being connected including master controller and with master controller, each thermic load of gas heater is set to be corresponded with the output frequency of wind pressure sensor by master controller, when gas heater is under a certain thermic load state, master controller changes blower fan electric current makes the output frequency of wind pressure sensor maintain on analog value all the time.The present invention goes to control the rotating speed of blower fan according to frequency signal, is allowed to avoid completely when smoke evacuation is obstructed, the insufficient phenomenon of burning that the factor such as height above sea level difference causes, overall adaptability, security, the efficientibility for improving gas heater；It is whether completely the same without the concern for the motor characteristic, technical parameter changed when inexpensive motor is changed in the later stage, design to engineering and bring after sale compared with convenience.
Description
Technical field
The present invention relates to gas heater control technology field, more particularly to a kind of gas heater control of air quantity self adaptation
System processed.
Background technology
Current gas heater is received in the larger generation downdraught of the blocked or extraneous wind speed of smoke exhaust pipe due to discharging fume
Resistance, before water heater automatic shutdown, the pernicious gas such as CO content will necessarily rise.Although the pernicious gas is not exceeded,
But in the present context, the health status of consumer is a greater impact certainly for life for a long time.Usual gas heater is used
Mechanical blast switch carries out blast protection, and the pressure difference in the positive/negative-pressure chamber according to blast switch controls opening or closing for microswitch,
So as to control the opening and closing of water heater.But mechanical blast switch stability is poor, sensitivity is not high, the easy oxygen in contact
The shortcomings of changing, only have a protection point.Although there is more semiconductor pressure sensor at present, by bars such as low blast, high accuracy
The restriction of part, the type sensor is relatively costly, so not promoted the use of in water heater industry always.
Application of the electronic type wind pressure sensor on gas heater is a new technique, though even have patent to refer to,
Larger length is all introducing overall structure, specifically how to realize, introduces very few, and also need to specialize in blower fan
The relation of sampling mouth negative pressure and extraneous contrary wind resistance, while also blower fan is adjusted with reference to combustion conditions and smoke components in real time turning
Speed, in addition it is also necessary to which other gas sensors so that this control mode is relative complex, feasibility is not very high.
In addition, height above sea level has considerable influence to the combustion position of gas heater, same water heater is on low altitude area ground
Area always runs into the phenomenons such as blast is abnormal using out of question in high altitude localities, also has stakeholder specifically designed for this problem
Special item is carried out, finally proves overcome by sea using invariable power, constant voltage, the even air-blower control such as constant current mode
Pull out situations such as the combustion position for causing is deteriorated, it is necessary to special Mathematical Modeling could solve this problem adjusting rotation speed of fan.
The content of the invention
For defect present in prior art, it is an object of the invention to provide one kind control it is simple, feasibility is high, wind
Measure the gas water heater control system of self adaptation.
To achieve the above objectives, the present invention is adopted the following technical scheme that.
A kind of gas water heater control system of air quantity self adaptation, it is characterised in that including master controller and and main control
The wind pressure sensor of device connection, each thermic load of gas heater and the output frequency one of wind pressure sensor are made by master controller
One correspondence, when gas heater is under a certain thermic load state, master controller changes blower fan electric current makes wind pressure sensor
Output frequency is maintained on analog value all the time.
Used as with improvement, each thermic load of gas heater is with the output frequency corresponding method of corresponding wind pressure sensor：
When without external wind pressure, 1) it is determined by experiment the blower fan sampling mouth negative pressure value corresponding to each thermic load of gas heater；2) root
According to blower fan electric current required under gas heater minimum thermic load, corresponding wind pressure sensor output frequency is drawn；3) basis
Blower fan electric current required under gas heater maximum heating load, draws corresponding wind pressure sensor output frequency；4) according to combustion
Blower fan sampling mouth negative pressure value and wind pressure sensor output frequency value under gas water heater minimum thermic load, maximum heating load state,
Determine that wind pressure sensor output frequency samples the relational expression of mouth negative pressure value with blower fan：Y=-AX+B；It is defeated that Y represents wind pressure sensor
Go out frequency, X represents blower fan sampling mouth negative pressure；5) according to step 1) in each thermic load of gas heater and the blower fan that determine sample mouth
The corresponding relation and step 4 of negative pressure value) in the relational expression wind pressure sensor that determines corresponding to each thermic load of gas heater
Output frequency.
Used as with improvement, when blower fan electric current increases to maximum, and wind pressure sensor output frequency does not recover to combustion gas heat still
During the corresponding output frequency of hydrophone current loads, the decreased influent flow of main controller controls gas heater.
Used as with improvement, each thermic load of gas heater corresponds to a rotation speed of fan protection value respectively；It is negative in a certain heat
Under lotus, when rotation speed of fan reaches corresponding more than rotation speed of fan protection value 5s, main controller controls gas heater automatic shutdown.
Used as with improvement, the thermic load is with the correlating method of corresponding rotation speed of fan protection value：When without external wind pressure,
1) it is determined by experiment the blower fan electric current corresponding to each gas heater thermic load；2) gas heater maximum heating load is determined
When rotation speed of fan protection value yH；3) it is determined by experiment rotation speed of fan protection value y during gas heater minimum thermic loadL；4)
Other load rotation speed of fan protection values are arranged on yHAnd yLLinear change between the two values, and meet linear relationship y=ax+
B, variable x represent blower fan current value, and variable y represents rotation speed of fan protection value；5) master controller is according to gas heater thermic load
With the corresponding relation that the corresponding relation of blower fan electric current determines gas heater thermic load and rotation speed of fan protection value.
Used as with improvement, the wind pressure sensor includes：Malleation chamber, negative pressure cavity, induction coil, spring and epithelium, it is described
Epithelium separates malleation chamber, negative pressure cavity, and one end of the spring is connected with epithelium, and the other end is connected with negative pressure cavity, the sensing
Magnet bore is formed between coil and spring；When negative pressure cavity and malleation chamber have pressure difference, spring drives the magnetic core in magnet bore to move
Make, electrical signal of reaction is produced in the presence of induction coil, by the treatment output frequency signal of oscillating circuit.
The beneficial effects of the invention are as follows：
First, after establishing machine by cable on gas heater, after System self-test is normal, preceding cleaning, igniting are carried out, any time is according to master
Between setpoint frequency corresponding to the output frequency and gas heater current loads of the wind pressure sensor that controller is collected
Difference, goes to control the rotating speed of blower fan using the difference, and untill the difference is sufficiently small, gas heater enters normal combustion shape
State, control is simple, feasibility is high.
2nd, the wind pressure signal of wind pressure sensor utilizes wind pressure signal not only as switching signal, also to water heater in real time
Combustion position is controlled, and gas heater is had Wind-Pressure Resistance characteristic high, and gas heater also can when outside air quantity is larger
Ensure normal combustion.
3rd, it is just that rotation speed of fan is also not to the utmost under same current due to the factor such as quality discrepancy of DC fan permanent magnet
Identical, the replacing to later stage motor brings cumbersome debugging.In the present invention, air quantity depends on wind pressure sensor output frequency, no
Blower voltage or electric current are being relied on, the abnormal combustion phenomenon that blower fan difference is brought thoroughly is being excluded, inexpensive motor is being changed in the later stage
When it is whether completely the same without the concern for the motor characteristic, technical parameter changed, design to engineering and bringing after sale is relatively defecated
Profit.
4th, because air quantity depends on wind pressure sensor output frequency, can intelligent compensation high altitude localities rotation speed of fan increasing
Amount, control blower fan remains optimum speed, so that water heater is in optimum combustion regime all the time, realizes truly
" permanent negative pressure " burns, the insufficient phenomenon of burning for avoiding height above sea level variance factor to cause completely, overall to improve the suitable of gas heater
Ying Xing, security, efficientibility.
5th, gas heater has multiple blast protection points according to workload demand, before protection point is reached, gas and hot water
Device is in optimum combustion regime all the time, and waste gas discharge is greatly reduced and safety in utilization is improved.
6th, using this invention described electronic type wind pressure sensor, tradition machinery formula blast switch can not only be realized
Institute it is functional, also as the sensor use electromagnetic induction technology, mechanical contact, frequency signal output, control chip can
Directly read, thoroughly solve traditional high phenomenon of blast switch fault rate.
Brief description of the drawings
Fig. 1 show gas heater wind pressure sensor output frequency under different thermic loads and samples mouth negative pressure value with blower fan
Between relation simulation drawing.
Fig. 2 show relation mould of the gas heater between the electromechanical stream of different thermic load leewards and rotation speed of fan protection value
Intend figure.
Fig. 3 show wind pressure sensor structural representation.
Description of reference numerals：
1：Malleation chamber, 2：Negative pressure cavity, 3：Induction coil, 4：Spring, 5：Epithelium.
Specific embodiment
Essence of the invention is more fully understood for convenience of those skilled in the art, below in conjunction with the accompanying drawings to of the invention specific
Implementation method is described in detail.
A kind of gas water heater control system of air quantity self adaptation, including master controller and the blast that is connected with master controller
Sensor, makes each thermic load of gas heater be corresponded with the output frequency of wind pressure sensor by master controller, works as combustion
Gas water heater is in when under a certain thermic load state, and master controller change blower fan electric current makes the output frequency of wind pressure sensor all the time
Maintain on analog value.
As shown in figure 1, each thermic load of gas heater is with the output frequency corresponding method of corresponding wind pressure sensor：
1) determine gas heater when without external wind pressure corresponding to minimum thermic load by normal experiment and theoretical calculation
Wind pressure sensor output frequency value b, blower fan sampling mouth negative pressure value a, you can determine L (a, b)-" PL states " point in Fig. 1.
2) wind pressure sensor output frequency of gas heater when without external wind pressure corresponding to minimum thermic load is similarly determined
Rate value d, blower fan sampling mouth negative pressure value, it is also possible to determine H (c, d)-" PH states " point in Fig. 1.
3) the sensor output frequency value according to wind pressure sensor and blower fan sample mouth negative pressure value into negative characteristic and on
State two states and can determine that sensor output frequency and the relational expression Y=-AX+B, Y of blower fan sampling pressure represent wind pressure sensor
Output frequency, X represents blower fan sampling mouth negative pressure.The result phase that the relational expression draws with actual multi-point sampler is understood through experiment test
Difference is very small, completely negligible during practical application.
4) fired state determination, draws blower fan sampling mouth negative pressure value and the wind pressure sensor output frequency i.e. figure of fired state
D (e, f) points in 1, and change the time and meet relational expression：Y=-AX+B.
(without external wind pressure) under system normal combustion state, one blower fan electric current of each thermic load correspondence, each blower fan electric current
One rotation speed of fan of correspondence, when external wind pressure is too high, because fans load lightens, sampling mouth negative pressure diminishes, i.e., master controller is adopted
The output frequency for collecting wind pressure sensor increases, and now control blower fan electric current increases immediately, blower voltage be also it is gradually increased,
On the premise of the rotating speed of blower fan is necessarily increased, constant in water-carrying capacity, and water heater temperature energy is constant, gas ratio valve is kept
Electric current is constant, until blower fan electric current increase to wind pressure sensor output frequency can be made to return to normal combustion state under it is corresponding defeated
Untill going out frequency.Same load and water heater temperature can it is constant on the premise of whole working condition all meet above-mentioned relation formula Y
=-AX+B, no matter how external wind pressure changes within the range, the combustion position of water heater is unaffected.
Therefore under different load, " permanent negative pressure " burning under " load " can be ensured in the range of certain stifled blast.And
When water-carrying capacity is constant, when " non-constant " occurs in water heater temperature, as other thermostate gas combustion water heater control modes, automatically
Control water-carrying capacity change, it is ensured that temperature it is constant；The state of temperature " non-constant " why occurs, is the work(due to blower fan
Close to maximum, now as external wind pressure continues to increase, blower fan electric current can not possibly increased rate, but not reach wind also
Machine rotating speed protects point, and now blower fan continues to increase rotating speed " uncontrollable " because load lightens, voltage also slowly increasing,
Blower fan electric current necessarily reduces to maintain power constant, in order to prevent blower fan in maximum power point long-play, then how to set
Rotation speed of fan protection point is put just to be particularly important.
As shown in Fig. 2 for the setting of rotation speed of fan protection point, determining to draw two by normal experiment and theoretical calculation
Rotation speed of fan protection value HC (c1, d1), LC (a1, b1), other load rotation speed of fan protection point linear change between LC to HC,
And meet linear relationship y=ax+b.Master controller need to only know that the electric current of now blower fan just can be according to this linear relationship meter
The rotation speed of fan protection point of the state is calculated, i.e. rotation speed of fan protection point is dynamic change, it is real to realize multiple blast protections
Waste gas discharge is reduced in point, certain limit and safety in utilization is improved, actual popularization and application are also relative to be easier to；The program is any
State can guarantee that water heater cmpletely burns, and realize the maximization of water-heater efficiency；It is emphasized that maximum blower fan turns
Speed corresponding with the blower fan maximum power point rotating speeds of protection point HC are differed and otherwise can not worked long hours appearance in maximum probability point too greatly
Easy burn-out blower fan.As long as any state rotation speed of fan reaches corresponding rotating speed protection point more than 5S, water heater automatic shutdown.
Situations such as being deteriorated for water heater combustion position caused by the air drops that are caused by factors such as height above sea level, this invention
It is relatively one of complete solution of above-mentioned technical bottleneck.
As shown in figure 3, the wind pressure sensor includes：Malleation chamber 1, negative pressure cavity 2, induction coil 3, spring 4, epithelium 5, institute
State epithelium 5 to separate malleation chamber 1, negative pressure cavity 2, one end of the spring 4 is connected with epithelium 5, and the other end is connected with negative pressure cavity, institute
State and form magnet bore between induction coil 3 and spring 4.
When negative pressure cavity 2 and malleation chamber 1 have pressure difference, spring 4 drives the magnetic core action in magnet bore, in induction coil 3
In the presence of produce electrical signal of reaction, by the treatment output frequency signal of oscillating circuit.Due in high altitude localities due to gas
Drops, atmospheric density diminishes, and the oxygen content provided under identical rotation speed of fan necessarily tails off, therefore will in high altitude localities
It is reasonably to improve rotation speed of fan to overcome the not enough effective ways of oxygen supply, and water heater parameter when dispatching from the factory has been adjusted,
How rotation speed of fan is reasonably improved as a technical bottleneck, and the rotating speed raising amount is dynamic change.
In the present embodiment, note standard atmospheric pressure is P0, gas heater at normal atmospheric pressure fully fire by a certain load point
Burn, corresponding sampling mouth negative pressure is set to P, and wind pressure sensor is transversely mounted, then meet following formula：
(P0- P) S+KX1=P0S ①
Wherein：S is epithelium area, and K is spring constant, and X1 is deformation quantity under current state.
When the gas heater is in high altitude localities, under identical rotation speed of fan, the factor such as other fired states is not
Become, then blower fan sampling mouth negative pressure diminishes, it is assumed that air drops Δ P0, sampling mouth negative pressure value diminishes Δ P；Under same load,
Because the inertia of blower fan and spring is unable to catastrophe characteristicses, if wind pressure sensor epithelium stress is F under the state, then have：
S is 2. for S+KX1- (P0- Δ P0) for F=((P0- Δ P0)-(P- Δ P))
2. formula then has to incite somebody to action 1. formula substitution：F=Δ PS ＞ 0；I.e. epithelium has the trend for moving up, until next balance
Point, in the case where the negative pressure value of negative pressure cavity 2 reduces Δ P, the volume of negative pressure cavity 2 will also increase, and this will further result in negative pressure
The negative pressure value in chamber 2 is reduced, and the wind pressure sensor output frequency of now master controller collection is bigger than the frequency that current loads set, this
It is that " permanent negative pressure " burning is mustn'ted, it is therefore necessary to control blower fan electric current to increase, so that increase rotation speed of fan, so as to provide more
Oxygen, until the wind pressure sensor output frequency for gathering is for untill current loads setpoint frequency.Therefore the water heater is in height
During Altitude Regions, master controller can be according to the wind pressure sensor output frequency adjust automatically rotation speed of fan of collection, similarly in Gao Hai
Rise sheer from level ground area design water heater, when low altitude area uses rotation speed of fan also can adjust automatically, make all the time water heater be in most
Good fired state.In addition, in more ventilating fan, even if rotation speed of fan is also not quite similar under same current, to later stage motor
Replacing brings cumbersome debugging, therefore uses this " permanent negative pressure " combustion technology, as long as sampling mouth position is constant with direction, is changing
It is whether completely the same without the concern for the motor characteristic, technical parameter changed during other motors, design to engineering and after sale band
Come compared with convenience.
Analysis understands that the air quantity self adaptation gas water heater control system can make water heater realize real meaning according to more than
On " permanent negative pressure " burning, thus avoid completely when smoke evacuation is obstructed, burning that the factor such as height above sea level difference causes it is insufficient existing
As overall adaptability, security, the efficientibility for improving gas heater.
Above specific embodiment has been described in detail to essence of the invention, but can not be come to of the invention with this
Protection domain is limited.It should be evident that under the enlightenment of essence of the invention, the art those of ordinary skill can also enter
The many improvement of row and modification, it should be noted that these improve and modification all fall claims of the invention it
It is interior.
Claims (6)
1. a kind of gas water heater control system of air quantity self adaptation, it is characterised in that including master controller and and master controller
The wind pressure sensor of connection, the output frequency for making each thermic load of gas heater and wind pressure sensor by master controller is one by one
Correspondence, when gas heater is under a certain thermic load state, master controller changes blower fan electric current makes the defeated of wind pressure sensor
Go out frequency to maintain on analog value all the time.
2. a kind of gas water heater control system of air quantity self adaptation according to claim 1, it is characterised in that combustion gas heat
Each thermic load of hydrophone is with the output frequency corresponding method of corresponding wind pressure sensor：When without external wind pressure,
1) the blower fan sampling mouth negative pressure value corresponding to each thermic load of gas heater is determined；
2) determine required blower fan electric current under gas heater minimum thermic load, draw corresponding wind pressure sensor output frequency
Rate；
3) according to blower fan electric current required under gas heater maximum heating load, corresponding wind pressure sensor output frequency is drawn
Rate；
4) mouth negative pressure value and wind pressure sensor are sampled according to the blower fan under gas heater minimum thermic load, maximum heating load state
Output frequency value, determines that wind pressure sensor output frequency samples the relational expression of mouth negative pressure value with blower fan：Y=-AX+B；Y represents wind
Pressure sensor output frequency, X represents blower fan sampling mouth negative pressure；
5) according to step 1) in each thermic load of gas heater and the blower fan that determine sample corresponding relation, the Yi Jibu of mouth negative pressure value
It is rapid 4) in the relational expression wind pressure sensor output frequency that determines corresponding to each thermic load of gas heater.
3. the gas water heater control system of a kind of air quantity self adaptation according to claim 1, it is characterised in that work as blower fan
Electric current increases to maximum, and wind pressure sensor output frequency does not recover to the corresponding output frequency of gas heater current loads still
When, the decreased influent flow of main controller controls gas heater.
4. a kind of gas water heater control system of air quantity self adaptation according to claim 1, it is characterised in that combustion gas heat
Each thermic load of hydrophone corresponds to a rotation speed of fan protection value respectively；Under a certain thermic load, when rotation speed of fan reaches corresponding wind
More than machine rotating speed protection value 5s, main controller controls gas heater automatic shutdown.
5. a kind of gas water heater control system of air quantity self adaptation according to claim 4, it is characterised in that the heat
Load is with the correlating method of corresponding rotation speed of fan protection value：When without external wind pressure,
1) the blower fan electric current corresponding to each gas heater thermic load is determined；
2) rotation speed of fan protection value y during gas heater maximum heating load is determinedH；
3) rotation speed of fan protection value y during gas heater minimum thermic load is determinedL；
4) other load rotation speed of fan protection values are arranged on yHAnd yLLinear change between the two values, and meet linear relationship y
=ax+b, variable x represent blower fan current value, and variable y represents rotation speed of fan protection value；
5) master controller according to the corresponding relation of gas heater thermic load and blower fan electric current determine gas heater thermic load with
The corresponding relation of rotation speed of fan protection value.
6. a kind of gas water heater control system of air quantity self adaptation according to claim 1, it is characterised in that the wind
Pressure sensor includes：Malleation chamber, negative pressure cavity, induction coil, spring and epithelium, the epithelium separate malleation chamber, negative pressure cavity, institute
The one end for stating spring is connected with epithelium, and the other end is connected with negative pressure cavity, and magnet bore is formed between the induction coil and spring；When
When negative pressure cavity has pressure difference with malleation chamber, spring drives the magnetic core action in magnet bore, and sense is produced in the presence of induction coil
Electric signal is answered, by the treatment output frequency signal of oscillating circuit.
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| CN108361961A (en) * | 2018-04-11 | 2018-08-03 | 广东万家乐燃气具有限公司 | Gas heater and hot-water heating system |
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