CN108826586A - A kind of control system and control method of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning - Google Patents
A kind of control system and control method of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning Download PDFInfo
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- CN108826586A CN108826586A CN201810578982.0A CN201810578982A CN108826586A CN 108826586 A CN108826586 A CN 108826586A CN 201810578982 A CN201810578982 A CN 201810578982A CN 108826586 A CN108826586 A CN 108826586A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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Abstract
The invention discloses a kind of control systems of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning,Including display,Controller,Temperature sensor and humidity sensor,The PORT COM for connecting display is equipped with inside the controller,With the first analog input channel and the second analog input channel equipped with the data for being respectively used to receive temperature sensor and humidity sensor,It is characterized in that,Three-point switch formula steam heating valve actuator and the interior three-point switch formula dry saturated steam humidification valve actuator equipped with reset spring in further including equipped with reset spring,It is additionally provided with inside the controller for being opened to the heating valve actuator transmission of three-point switch formula steam,First digital output channel of OFF signal and for three-point switch formula dry saturated steam humidification valve actuator transmission open,Second digital output channel of OFF signal,The present invention can be under the premise of guaranteeing that control precision is higher,Reduce steam heating,Dry saturated steam humidifies the production cost of the control system of constant temperature and humidity central air-conditioning.
Description
Technical field
The present invention relates to air conditioner controlling technology field, in particular to steam heating, dry saturated steam humidifies constant temperature and humidity central hollow
The control system and control method of tune.
Background technique
Referring to Fig.2, the control system of the central air-conditioning for the constant temperature and humidity that steam heating, dry saturated steam humidify, due to being related to temperature
The requirement of degree and humid control precision often uses in the type selecting of steam heating valve and the mating actuator of dry saturated steam humidifier valve
Proportional electric valve actuator with spring reset function, to meet the requirement and power supply of controlled temperature and humidity to precision simultaneously
Cutting vapour source, which can be automatically closed, in power-off late gate ensures safe requirement.
However, existing proportional electric valve actuator with spring reset function price itself is very expensive, and it is this kind of
The usual equipment of central air-conditioning is at least needed using 2 or 2 or more the proportional electric valve actuators with spring reset, thus
The control system production cost of the central air-conditioning for the constant temperature and humidity for causing steam heating, dry saturated steam to humidify is very high；Meanwhile the control
System processed need to configure the channel AO of the two analog outputs proportional electric with steam heater and dry steam humidifier respectively
Valve actuator matches, and the channel analog output AO of control system will be much higher than the digital quantity of control system in price
Output channel, so that the Practical Project of the control system of the central air-conditioning for the constant temperature and humidity that steam heating, dry saturated steam humidify
Cost is higher.
As it can be seen that the prior art could be improved and improve.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide steam heating, dry saturated steam humidification are permanent
The control system and control method of constant temperature and humidity central air-conditioning, it is intended to solve in the prior art, before guaranteeing that control precision is higher
It puts, how to reduce steam heating, the technology of production cost of control system of dry saturated steam humidification constant temperature and humidity central air-conditioning is asked
Topic.
In order to achieve the above object, this invention takes following technical schemes：
A kind of control system of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning, including display, controller, temperature pass
Sensor and humidity sensor, are equipped with the PORT COM for connecting display inside the controller, and equipped with being respectively used to connect
The first analog input channel and the second analog input channel of the data of shrinkage temperature sensor and humidity sensor, feature
It is, further includes that the interior three-point switch formula steam heating valve actuator equipped with reset spring and interior three equipped with reset spring point open
Pass formula dry saturated steam humidifies valve actuator, is additionally provided with inside the controller for passing to three-point switch formula steam heating valve actuator
First digital output channel of defeated switching signal and for three-point switch formula dry saturated steam humidification valve actuator transmitting switch letter
Number the second digital output channel.
In a kind of control system of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning, first number
Measuring output channel includes the first ON signal digital output channel and the first OFF signal digital output channel, and described first opens letter
Number digital quantity output channel and the first OFF signal digital output channel are passed to three-point switch formula steam heating valve actuator respectively
Defeated open and close signal.
In a kind of control system of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning, second number
Measuring output channel includes the second ON signal digital output channel and the second OFF signal digital output channel, and described second opens letter
Number digital quantity output channel and the second OFF signal digital output channel humidify valve actuator to three-point switch formula dry saturated steam respectively
Transmit open and close signal.
In a kind of control system of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning, the first digital quantity is defeated
Channel and the second digital output channel are realized by relay drive circuit out.
In a kind of control system of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning, the display is
Touch control display.
A kind of steam heating provided by the invention, dry saturated steam humidification constant temperature and humidity central air-conditioning control method, this method
Include the following steps：
A, to controller by the periodic square wave of one detection comparison temperature and humidity of programming setting, by display to control
A set temperature T1, a temperature accuracy T2, a setting humidity W1, a humidity precision W2 are respectively set inside device；
B, controller reads the temperature of tested region by its first analog input channel and the second analog input channel respectively
The data of sensor and humidity sensor are spent, real time temperature T3 and real-time humidity W3 is obtained；
C, when periodic square wave becomes low level moment from high level, controller will be received real-time by control program
Temperature T3 is compared with set temperature T1 and temperature accuracy T2；
If T3<T1-T2, controller is by the first ON signal digital output channel in the first digital output channel to 3 points
Switching regulator steam heats valve actuator and exports ON signal, and steam heating valve is opened；If T3>T1+T2, controller pass through the first number
First OFF signal digital output channel of word amount output channel exports OFF signal to three-point switch formula steam heating valve actuator,
Steam heating valve is closed；If T1-T2<T3<T1+T2, the first ON signal number in the first digital output channel of controller
Output channel and the first equal no power in OFF signal digital output channel are measured, steam heating valve keeps current aperture constant；
When next cycle square wave arrives, according to above-mentioned condition loop control；
D, when periodic square wave becomes low level moment from high level, controller will be received real-time by control program
Humidity W3 is compared with setting humidity W1 and humidity precision W2；
If W3<W1-W2, controller is by the second ON signal digital output channel in the second digital output channel to 3 points
Switching regulator dry saturated steam humidifies valve actuator and exports ON signal, and dry saturated steam humidifier valve is opened；If W3>W1+W2, controller pass through the
The second OFF signal digital output channel in two digital output channels is exported to three-point switch formula dry saturated steam humidification valve actuator
OFF signal, dry saturated steam humidifier valve are closed；If W1-W2<W3<W1+W2, the second of the second digital output channel of controller open
Signal digital output channel and the second equal no power in OFF signal digital output channel, dry saturated steam humidifier valve keep current aperture
It is constant；
When next cycle square wave arrives, according to above-mentioned condition loop control.
In the control method of a kind of heating of steam, dry saturated steam humidification constant temperature and humidity central air-conditioning, the step A is also
Including by display to accumulative unlatching runing time t1, the steam that a steam heating valve is respectively set inside controller
The unlatching range time tmax of heating valve, the output to three-point switch formula steam heating valve actuator output ON signal
A duration t2 and output duration t3 to three-point switch formula steam heating valve actuator output OFF signal, wherein
T1 initial value is 0, t1=n*t2-m*t3；
The step C further includes that controller is added the accumulative unlatching runing time t1 of steam heating valve with steam by control program
The unlatching range time tmax of thermal valve is compared;
If t1<Tmax and T3<The first ON signal digital output of T1-T2, the first digital output channel of controller are logical
Road output ON signal powers off after continuing t2；If t1<Tmax and T3>T1+T2, the first digital output channel of controller
First OFF signal digital output channel output OFF signal powers off after continuing t3；If t1<Tmax and T1-T2<T3<T1+T2,
The first ON signal digital output channel in the first digital output channel of controller and the first OFF signal digital output are logical
Road powers off, and steam heating valve keeps current aperture constant.
In the control method of a kind of heating of steam, dry saturated steam humidification constant temperature and humidity central air-conditioning, the step A is also
Including by display to be respectively set inside controller a steam humidification valve accumulative unlatching runing time t1 ', one it is dry
The unlatching range time tmax ' of steam humidification valve, one to three-point switch formula dry saturated steam humidification valve actuator output open letter
Number output duration t2 ' and one to three-point switch formula dry saturated steam humidification valve actuator output OFF signal output continue when
Between t3 ', wherein t1 ' initial value be 0, t1 '=n*t2 '-m*t3 '；
The step D further includes controller by controlling program for the accumulative unlatching runing time t1 ' of dry saturated steam humidifier valve and steaming
The unlatching range time tmax ' of vapour humidifier valve is compared;
If t1 '<Tmax ' and W3<The second ON signal digital quantity of W1- W2, the second digital output channel of controller are defeated
Output ON signal in channel continues t2 ' and powers off afterwards out；If t1 '<Tmax ' and W3>The second digital quantity of W1+ W2, controller are defeated
The second OFF signal digital output channel output OFF signal in channel continues t3 ' and powers off afterwards out；If t1 '<Tmax ' and W1-
W2< W3<Letter is closed in W1+ W2, the second ON signal digital output channel in the second digital output channel of controller and second
Number digital quantity output channel powers off, and dry saturated steam humidifier valve keeps current aperture constant.
Beneficial effect：
The present invention provides the control systems and control method of a kind of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning, lead to
It is existing to substitute respectively at steam heating valve and the matching used mode of dry saturated steam humidifier valve to cross two three-point switch formula actuators
Two proportional electric valve actuators in technology have respectively at steam heating valve and the matched usage mode of dry saturated steam humidifier valve
Effect reduce steam heating, dry saturated steam humidification constant temperature and humidity central air-conditioning control system production cost；Furthermore also pass through number
Word amount output channel substitutes analog output channel in the prior art with the matching used mode of three-point switch formula actuator
With the matching used mode of proportional electric valve actuator, steam heating further reduced, dry saturated steam humidifies in constant temperature and humidity
Entreat the production cost of the control system of air-conditioning.
Detailed description of the invention
Fig. 1 humidifies the structure of the control system of constant temperature and humidity central air-conditioning for steam provided by the invention heating, dry saturated steam
Schematic diagram；
Fig. 2 humidifies the structural schematic diagram of the control system of constant temperature and humidity central air-conditioning for the heating of existing steam, dry saturated steam.
In figure：
100- display；200- controller；210- PORT COM；The first analog input channel 220-；The second analog quantity of 230-
Input channel；The first digital output of 240- channel；241- the first ON signal digital output channel；242- the first OFF signal number
Word amount output channel；The second digital output of 250- channel；251- the second ON signal digital output channel；252- second closes letter
Number digital quantity output channel；300- temperature sensor；400- humidity sensor；500- three-point switch formula steam heating valve executes
Device；600- three-point switch formula dry saturated steam humidifies valve actuator；700 steam heating valves；800- dry saturated steam humidifier valve.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
The present invention provides the control system and control method of a kind of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning,
To make the purpose of the present invention, technical solution and effect clearer, clear and definite, as follows in conjunction with drawings and embodiments to the present invention into
One step is described in detail.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit this hair
It is bright.
Referring to Fig. 1, the present invention provides a kind of control system of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning,
Including display 100, controller 200, temperature sensor 300 and humidity sensor 400, it is equipped with inside controller 200 for connecting
The PORT COM 210 of display 100 is connect, and equipped with the data for being respectively used to reception temperature sensor 300 and humidity sensor 400
The first analog input channel 220 and the second analog input channel 230, further include in be equipped with reset spring three-point switch
Formula steam heats valve actuator 500 and the interior three-point switch formula dry saturated steam equipped with reset spring humidifies valve actuator 600, controller
It is additionally provided with inside 200 for the first digital output to three-point switch formula steam heating 500 transmitting switch signal of valve actuator
Channel 240 and the second digital output for three-point switch formula dry saturated steam humidification 600 transmitting switch signal of valve actuator are logical
Road 250.In practical Regulation of Constant Temperature, temperature sensor 300 first obtains the actual temperature of tested region, then controller
200 by its first analog input channel 220 reception temperature data obtained of temperature sensor 300 and to the temperature data
Analyzed, after will be analyzed the result that obtains and be transferred at 3 points by the first digital output channel 240 with signal form and opened
Pass formula steam heats valve actuator 500, and three-point switch formula steam heats valve actuator 500 and controls the movement of steam heating valve 700.It is permanent
Wet control process is identical as Regulation of Constant Temperature principle, and this will not be detailed here.
Further, the first digital output channel 240 includes that the first ON signal digital output channel 241 and first is closed
Signal digital output channel 242, the first ON signal digital output channel 241 and the first OFF signal digital output channel
242 transmit open and close signal to three-point switch formula steam heating valve actuator 500 respectively.
Further, the second digital output channel 250 includes that the second ON signal digital output channel 251 and second is closed
Signal digital output channel 252, the second ON signal digital output channel 251 and the second OFF signal digital output channel
252 transmit open and close signal to three-point switch formula dry saturated steam humidification valve actuator 600 respectively.
Further, the first digital output channel 240 and the second digital output channel 250 are by relay driving electricity
It realizes on road.Since the load of above-mentioned control system is larger, the first digital output channel 240 and the second digital output
Channel 250 is all made of relay drive circuit realization.
Specifically, display 100 is touch control display.The setting is regular job for convenience.
The present invention also provides a kind of steam heating, dry saturated steam humidification constant temperature and humidity central air-conditioning control method, the party
Method includes the following steps：
A, to controller by the periodic square wave of one detection comparison temperature and humidity of programming setting, by display to control
A set temperature T1, a temperature accuracy T2, a setting humidity W1 and a humidity precision W2 are respectively set inside device；
B, controller reads the temperature of tested region by its first analog input channel and the second analog input channel respectively
The data of sensor and humidity sensor are spent, real time temperature T3 and real-time humidity W3 is obtained；
C, when periodic square wave becomes low level moment from high level, controller will be received real-time by control program
Temperature T3 is compared with set temperature T1 and temperature accuracy T2；
If T3<T1-T2, controller is by the first ON signal digital output channel in the first digital output channel to 3 points
Switching regulator steam heats valve actuator and exports ON signal, and steam heating valve is opened；If T3>T1+T2, controller pass through the first number
First OFF signal digital output channel of word amount output channel exports OFF signal to three-point switch formula steam heating valve actuator,
Steam heating valve is closed；If T1-T2<T3<T1+T2, the first ON signal number in the first digital output channel of controller
Output channel and the first equal no power in OFF signal digital output channel are measured, steam heating valve keeps current aperture constant；
When next cycle square wave arrives, according to above-mentioned condition loop control；
D, when periodic square wave becomes low level moment from high level, controller will be received real-time by control program
Humidity W3 is compared with setting humidity W1 and humidity precision W2；
If W3<W1-W2, controller is by the second ON signal digital output channel in the second digital output channel to 3 points
Switching regulator dry saturated steam humidifies valve actuator and exports ON signal, and dry saturated steam humidifier valve is opened；If W3>W1+W2, controller pass through the
The second OFF signal digital output channel in two digital output channels is exported to three-point switch formula dry saturated steam humidification valve actuator
OFF signal, dry saturated steam humidifier valve are closed；If W1-W2<W3<W1+W2, the second of the second digital output channel of controller open
Signal digital output channel and the second equal no power in OFF signal digital output channel, dry saturated steam humidifier valve keep current aperture
It is constant；
When next cycle square wave arrives, according to above-mentioned condition loop control.
Wherein, step C and step D can be carried out step by step, can also synchronize progress.
Further, step A further includes by display to the tired of a steam heating valve is respectively set inside controller
Meter open runing time t1, the unlatching range time tmax of steam heating valve, one add to three-point switch formula steam
Thermal valve actuator exports the output duration t2 of ON signal and one closes to the heating valve actuator output of three-point switch formula steam
The output duration t3 of signal, wherein t1 initial value is 0, t1=n*t2-m*t3；
Step C further includes controller by controlling program for the accumulative unlatching runing time t1 of steam heating valve and steam heating valve
Unlatching range time tmax be compared;
If t1<Tmax and T3<The first ON signal digital output of T1-T2, the first digital output channel of controller are logical
Road output ON signal powers off after continuing t2；If t1<Tmax and T3>T1+T2, the first digital output channel of controller
First OFF signal digital output channel output OFF signal powers off after continuing t3；If t1<Tmax and T1-T2<T3<T1+T2,
The first ON signal digital output channel in the first digital output channel of controller and the first OFF signal digital output are logical
Road powers off, and steam heating valve keeps current aperture constant.
It should be noted that the purpose of setting of periodic square wave is the control in order to improve control system to temperature and humidity
The circulation time of precision, periodic square wave is shorter, and control system is more intensive to the detection number of comparisons of temperature and humidity, control system
Unite it is then higher to the control precision of temperature and humidity, when periodic square wave circulation time enough in short-term, control system can be to temperature
The detection that degree and humidity carry out approximate continuous is compared, and control system reaches highest to the control precision of temperature and humidity.Above-mentioned t2
It is output duration of the single to three-point switch formula steam heating valve actuator output ON signal, is also believed to steam heating
Time needed for the aperture change procedure of valve opening procedure；Above-mentioned t3 is that single is defeated to three-point switch formula steam heating valve actuator
The output duration of OFF signal out, time needed for being also believed to the aperture change procedure of steam heating valve closing process；
It for convenience of understanding, is exemplified below, if steam heating valve maximum opening is 100, steam heats valve opening and changes institute from 0-100
It takes time as 10 seconds, i.e. tmax=10；Steam heating valve initial opening is 0, when need to open steam heating valve, and specified single
Aperture is 30, and controller is to three-point switch formula steam heating valve actuator output ON signal and output duration is 3 seconds, that is, is steamed
It is 3 seconds, i.e. t2=3 that vapour, which heats transformation period of the valve opening from 0 to 30,；Steam heating valve need to be turned down again afterwards, and single is specified to close
Aperture is 10, and controller is to three-point switch formula steam heating valve actuator output OFF signal and output duration is 1 second, that is, is steamed
It is 1 second, i.e. t3=1 that vapour, which heats transformation period of the valve opening from 30 to 20,；T1=t2-t3=2 at this time steam must occur through converting
Heating valve opening is 20, does not reach steam heating valve maximum opening also.By above-mentioned principle, which is to work as steam heating valve
When aperture reaches maximum opening, then in slew relay driving circuit relay work, it is therefore an objective to protective relay, extend after
The service life of electric appliance.
Further, step A further includes by display to the tired of a steam humidification valve is respectively set inside controller
Meter open runing time t1 ', the unlatching range time tmax ' of dry saturated steam humidifier valve, one it is dry to three-point switch formula
Steam humidification valve actuator exports the output duration t2 ' of ON signal and one executes to three-point switch formula dry saturated steam humidifier valve
The output duration t3 ' of device output OFF signal, wherein t1 ' initial value is 0, t1 '=n*t2 '-m*t3 '；
Step D further includes that controller is added the accumulative unlatching runing time t1 ' of dry saturated steam humidifier valve with steam by control program
The unlatching range time tmax ' of wet valve is compared;
If t1 '<Tmax ' and W3<The second ON signal digital quantity of W1- W2, the second digital output channel of controller are defeated
Output ON signal in channel continues t2 ' and powers off afterwards out；If t1 '<Tmax ' and W3>The second digital quantity of W1+ W2, controller are defeated
The second OFF signal digital output channel output OFF signal in channel continues t3 ' and powers off afterwards out；If t1 '<Tmax ' and W1-
W2< W3<Letter is closed in W1+ W2, the second ON signal digital output channel in the second digital output channel of controller and second
Number digital quantity output channel powers off, and dry saturated steam humidifier valve keeps current aperture constant.
Above-mentioned t1 ', t2 ', t3 ', the setting principle of tmax ' are identical as the setting principle of t1, t2, t3, tmax,
This is no longer described in detail.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to protection scope of the present invention.
Claims (8)
1. a kind of control system of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning, including display, controller, temperature
Sensor and humidity sensor, are equipped with the PORT COM for connecting display inside the controller, and equipped with being respectively used to
The first analog input channel and the second analog input channel of the data of temperature sensor and humidity sensor are received, it is special
Sign is, further includes the interior three-point switch formula steam heating valve actuator equipped with reset spring and interior three equipped with reset spring point
Switching regulator dry saturated steam humidifies valve actuator, is additionally provided with inside the controller for heating valve actuator to three-point switch formula steam
Transmit open and close signal the first digital output channel and for three-point switch formula dry saturated steam humidification valve actuator transmission open,
Second digital output channel of OFF signal.
2. a kind of control system of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning according to claim 1,
It is characterized in that, first digital output channel includes the first ON signal digital output channel and the first OFF signal digital quantity
Output channel, the first ON signal digital output channel and the first OFF signal digital output channel are respectively to three-point switch
Formula steam heats valve actuator and transmits open and close signal.
3. a kind of control system of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning according to claim 1,
It is characterized in that, second digital output channel includes the second ON signal digital output channel and the second OFF signal digital quantity
Output channel, the second ON signal digital output channel and the second OFF signal digital output channel are respectively to three-point switch
Formula dry saturated steam humidifies valve actuator and transmits open and close signal.
4. a kind of control system of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning according to claim 1,
It is characterized in that, the first digital output channel and the second digital output channel are realized by relay drive circuit.
5. a kind of control system of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning according to claim 1,
It is characterized in that, the display is touch control display.
6. the control method of a kind of heating of steam, dry saturated steam humidification constant temperature and humidity central air-conditioning, which is characterized in that this method includes
Following steps：
A, to controller by the periodic square wave of one detection comparison temperature and humidity of programming setting, by display to control
A set temperature T1, a temperature accuracy T2, a setting humidity W1 and a humidity precision W2 are respectively set inside device；
B, controller reads the temperature of tested region by its first analog input channel and the second analog input channel respectively
The data of sensor and humidity sensor are spent, real time temperature T3 and real-time humidity W3 is obtained；
C, when periodic square wave becomes low level moment from high level, controller will be received real-time by control program
Temperature T3 is compared with set temperature T1 and temperature accuracy T2；
If T3<T1-T2, controller is by the first ON signal digital output channel in the first digital output channel to 3 points
Switching regulator steam heats valve actuator and exports ON signal, and steam heating valve is opened；If T3>T1+T2, controller pass through the first number
First OFF signal digital output channel of word amount output channel exports OFF signal to three-point switch formula steam heating valve actuator,
Steam heating valve is closed；If T1-T2<T3<T1+T2, the first ON signal number in the first digital output channel of controller
Output channel and the first equal no power in OFF signal digital output channel are measured, steam heating valve keeps current aperture constant；
When next cycle square wave arrives, according to above-mentioned condition loop control；
D, when periodic square wave becomes low level moment from high level, controller will be received real-time by control program
Humidity W3 is compared with setting humidity W1 and humidity precision W2；
If W3<W1-W2, controller is by the second ON signal digital output channel in the second digital output channel to 3 points
Switching regulator dry saturated steam humidifies valve actuator and exports ON signal, and dry saturated steam humidifier valve is opened；If W3>W1+W2, controller pass through the
The second OFF signal digital output channel in two digital output channels is exported to three-point switch formula dry saturated steam humidification valve actuator
OFF signal, dry saturated steam humidifier valve are closed；If W1-W2<W3<W1+W2, the second of the second digital output channel of controller open
Signal digital output channel and the second equal no power in OFF signal digital output channel, dry saturated steam humidifier valve keep current aperture
It is constant；
When next cycle square wave arrives, according to above-mentioned condition loop control.
7. the control method of a kind of steam heating according to claim 6, dry saturated steam humidification constant temperature and humidity central air-conditioning,
It is characterized in that, the step A further includes being opened by display to the accumulative of steam heating valve is respectively set inside controller
Open that runing time t1, the unlatching range time tmax of steam heating valve, one to three-point switch formula steam heating valve
Actuator exports the output duration t2 of ON signal and one exports OFF signal to three-point switch formula steam heating valve actuator
Output duration t3, wherein t1 initial value be 0, t1=n*t2-m*t3；
The step C further includes that controller is added the accumulative unlatching runing time t1 of steam heating valve with steam by control program
The unlatching range time tmax of thermal valve is compared;
If t1<Tmax and T3<The first ON signal digital output of T1-T2, the first digital output channel of controller are logical
Road output ON signal powers off after continuing t2；If t1<Tmax and T3>T1+T2, the first digital output channel of controller
First OFF signal digital output channel output OFF signal powers off after continuing t3；If t1<Tmax and T1-T2<T3<T1+T2,
The first ON signal digital output channel in the first digital output channel of controller and the first OFF signal digital output are logical
Road powers off, and steam heating valve keeps current aperture constant.
8. the control method of a kind of steam heating according to claim 6, dry saturated steam humidification constant temperature and humidity central air-conditioning,
It is characterized in that, the step A further includes being opened by display to the accumulative of steam humidification valve is respectively set inside controller
Open that runing time t1 ', the unlatching range time tmax ' of dry saturated steam humidifier valve, one to three-point switch formula dry saturated steam
Humidify valve actuator output ON signal output duration t2 ' and one to three-point switch formula dry saturated steam humidify valve actuator it is defeated
The output duration t3 ' of OFF signal out, wherein t1 ' initial value is 0, t1 '=n*t2 '-m*t3 '；
The step D further includes controller by controlling program for the accumulative unlatching runing time t1 ' of dry saturated steam humidifier valve and steaming
The unlatching range time tmax ' of vapour humidifier valve is compared;
If t1 '<Tmax ' and W3<The second ON signal digital quantity of W1- W2, the second digital output channel of controller are defeated
Output ON signal in channel continues t2 ' and powers off afterwards out；If t1 '<Tmax ' and W3>The second digital quantity of W1+ W2, controller are defeated
The second OFF signal digital output channel output OFF signal in channel continues t3 ' and powers off afterwards out；If t1 '<Tmax ' and W1-
W2< W3<Letter is closed in W1+ W2, the second ON signal digital output channel in the second digital output channel of controller and second
Number digital quantity output channel powers off, and dry saturated steam humidifier valve keeps current aperture constant.
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