CN108826586B - Control system and control method for steam heating dry steam humidifying constant-temperature constant-humidity central air conditioner - Google Patents
Control system and control method for steam heating dry steam humidifying constant-temperature constant-humidity central air conditioner Download PDFInfo
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- CN108826586B CN108826586B CN201810578982.0A CN201810578982A CN108826586B CN 108826586 B CN108826586 B CN 108826586B CN 201810578982 A CN201810578982 A CN 201810578982A CN 108826586 B CN108826586 B CN 108826586B
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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
Abstract
The invention discloses a control system of a steam heating dry steam humidifying constant temperature and humidity central air conditioner, which comprises a display, a controller, a temperature sensor and a humidity sensor, wherein a communication port used for connecting the display is arranged in the controller, and a first analog quantity input channel and a second analog quantity input channel which are respectively used for receiving data of the temperature sensor and the humidity sensor are arranged in the controller, the control system is characterized by also comprising a three-point switch type steam heating valve actuator provided with a reset spring and a three-point switch type dry steam humidifying valve actuator provided with a reset spring, a first digital quantity output channel used for transmitting on and off signals to the three-point switch type steam heating valve actuator and a second digital quantity output channel used for transmitting on and off signals to the three-point switch type dry steam humidifying valve actuator are also arranged in the controller, and on the premise of ensuring higher control precision, the production cost of the control system of the steam heating and dry steam humidifying constant-temperature constant-humidity central air conditioner is reduced.
Description
Technical Field
The invention relates to the technical field of air conditioner control, in particular to a control system and a control method of a steam heating and dry steam humidifying constant-temperature constant-humidity central air conditioner.
Background
Referring to fig. 1, in a control system of a constant temperature and humidity central air conditioner with steam heating and dry steam humidification, because of requirements on temperature and humidity control accuracy, a proportional electric valve actuator with a spring reset function is often adopted in the selection of actuators matched with a steam heating valve and a dry steam humidification valve, so as to simultaneously meet the requirements on accuracy of the controlled temperature and humidity and the requirements on safety by automatically closing and cutting off a steam source after a power supply is cut off.
However, the existing proportional electric valve actuator with spring return function is very expensive, and such central air conditioner usually needs at least 2 or more than 2 proportional electric valve actuators with spring return for one device, which results in very high production cost of the control system of the constant temperature and humidity central air conditioner with steam heating and dry steam humidification; meanwhile, the control system needs to be provided with two analog output AO channels which are respectively matched with the proportional electric valve actuators of the steam heater and the dry steam humidifier, and the analog output AO channel of the control system is much higher than the digital output channel of the control system in price, so that the actual engineering cost of the control system of the constant-temperature and constant-humidity central air conditioner for steam heating and dry steam humidification is higher.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a control system and a control method for a steam heating and dry steam humidifying constant-temperature and constant-humidity central air conditioner, and aims to solve the technical problem of reducing the production cost of the control system for the steam heating and dry steam humidifying constant-temperature and constant-humidity central air conditioner on the premise of ensuring higher control precision in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a steam heating dry steam humidification constant temperature and humidity central air conditioning's control system, includes display, controller, temperature sensor and humidity transducer, the inside communication port that is used for connecting the display that is equipped with of controller with be equipped with the first analog input channel and the second analog input channel that are used for receiving temperature sensor and humidity transducer's data respectively, its characterized in that still is equipped with reset spring's three-point switch formula steam heating valve executor in and be equipped with reset spring's three-point switch formula dry steam humidification valve executor, the inside first digital output channel that is used for transmitting switching signal to three-point switch formula steam heating valve executor and the second digital output channel that is used for transmitting switching signal to three-point switch formula dry steam humidification valve executor that still is equipped with of controller.
In the control system of the steam heating dry steam humidification constant-temperature constant-humidity central air conditioner, the first digital quantity output channel comprises a first opening signal digital quantity output channel and a first closing signal digital quantity output channel, and the first opening signal digital quantity output channel and the first closing signal digital quantity output channel respectively transmit opening and closing signals to the three-point switch type steam heating valve actuator.
In the control system of the steam heating dry steam humidification constant-temperature and constant-humidity central air conditioner, the second digital output channel comprises a second on signal digital output channel and a second off signal digital output channel, and the second on signal digital output channel and the second off signal digital output channel respectively transmit on and off signals to the three-point switch type dry steam humidification valve actuator.
In the control system of the steam heating dry steam humidifying constant-temperature constant-humidity central air conditioner, the first digital output channel and the second digital output channel are both realized by a relay drive circuit.
In the control system of the steam heating dry steam humidifying constant-temperature constant-humidity central air conditioner, the display is a touch display.
The invention provides a control method of a steam heating and dry steam humidifying constant-temperature constant-humidity central air conditioner, which comprises the following steps:
A. setting a periodic square wave for detecting and comparing temperature and humidity to a controller through programming, and respectively setting a set temperature T1, a temperature precision T2, a set humidity W1 and a humidity precision W2 to the interior of the controller through a display;
B. the controller respectively reads data of a temperature sensor and a humidity sensor of a detected area through a first analog quantity input channel and a second analog quantity input channel of the controller to obtain a real-time temperature T3 and a real-time humidity W3;
C. at the moment when the periodic square wave is changed from high level to low level, the controller compares the received real-time temperature T3 with the set temperature T1 and the temperature precision T2 through a control program;
if T3< T1-T2, the controller outputs an opening signal to the three-point switch type steam heating valve actuator through a first opening signal digital output channel of the first digital output channel, and the steam heating valve is opened; if T3> T1+ T2, the controller outputs a closing signal to the three-point switch type steam heating valve actuator through a first closing signal digital output channel of the first digital output channel, and the steam heating valve is closed; if T1-T2< T3< T1+ T2, the first opening signal digital quantity output channel and the first closing signal digital quantity output channel of the first digital quantity output channel of the controller are not electrified, and the steam heating valve keeps the current opening degree unchanged;
when the next periodic square wave comes, controlling circularly according to the condition;
D. at the moment when the periodic square wave is changed from high level to low level, the controller compares the received real-time humidity W3 with the set humidity W1 and the humidity precision W2 through a control program;
if W3< W1-W2, the controller outputs an opening signal to the three-point switch type dry steam humidifying valve actuator through a second opening signal digital output channel of the second digital output channel, and the dry steam humidifying valve is opened; if W3> W1+ W2, the controller outputs a closing signal to the three-point switch type dry steam humidifying valve actuator through a second closing signal digital output channel of the second digital output channel, and the dry steam humidifying valve is closed; if W1-W2< W3< W1+ W2, a second opening signal digital quantity output channel and a second closing signal digital quantity output channel of a second digital quantity output channel of the controller are not electrified, and the dry steam humidifying valve keeps the current opening degree unchanged;
when the next periodic square wave comes, the control is cycled according to the conditions.
In the control method of the steam heating and dry steam humidifying constant-temperature and constant-humidity central air conditioner, the step A further comprises the steps of respectively setting accumulated opening running time t1 of a steam heating valve, opening maximum travel time tmax of the steam heating valve, output duration t2 of an on signal output to a three-point switch type steam heating valve actuator and output duration t3 of an off signal output to the three-point switch type steam heating valve actuator to the controller through a display, wherein the initial value of t1 is 0, and t1= n t2-m t 3; wherein n and m are natural numbers, wherein n is the number of times that the controller outputs an on signal to the three-point switch type steam heating valve actuator after the central air conditioner is started, and m is the number of times that the controller outputs an off signal to the three-point switch type steam heating valve actuator after the central air conditioner is started; when the central air conditioner is shut down, n and m are restored to 0;
the step C also comprises the step that the controller compares the accumulated opening running time t1 of the steam heating valve with the maximum opening stroke time tmax of the steam heating valve through a control program;
if T1< tmax and T3< T1-T2, the first open signal digital output channel of the first digital output channel of the controller is powered off after outputting an open signal for T2; if T1< tmax and T3> T1+ T2, the first off signal digital output channel of the first digital output channel of the controller outputs an off signal for T3 and then is powered off; if T1< tmax and T1-T2< T3< T1+ T2, both the first opening signal digital quantity output channel and the first closing signal digital quantity output channel of the first digital quantity output channel of the controller are powered off, and the current opening degree of the steam heating valve is kept unchanged.
In the control method of the steam heating and dry steam humidifying constant-temperature and constant-humidity central air conditioner, the step A further comprises the steps of respectively setting accumulated opening running time t1 'of a dry steam humidifying valve, opening maximum travel time tmax' of the dry steam humidifying valve, output duration t2 'of an on signal output to a three-point switch type dry steam humidifying valve actuator and output duration t 3' of an off signal output to the three-point switch type dry steam humidifying valve actuator through a display, wherein the initial value of t1 'is 0, and t 1' = n t2 '-m t 3'; wherein n and m are natural numbers, wherein n is the number of times that the controller outputs an on signal to the three-point switch type dry steam humidifying valve actuator after the central air conditioner is started, and m is the number of times that the controller outputs an off signal to the three-point switch type dry steam humidifying valve actuator after the central air conditioner is started; when the central air conditioner is shut down, n and m are restored to 0;
step D also comprises the step that the controller compares the accumulated opening running time t1 'of the dry steam humidifying valve with the opening maximum travel time tmax' of the dry steam humidifying valve through a control program;
if t1 ' < tmax ' and W3< W1-W2, the second on signal digital output channel of the second digital output channel of the controller is powered off after outputting the on signal for t2 '; if t1 ' < tmax ' and W3> W1+ W2, the second off signal digital output channel of the second digital output channel of the controller is powered off after outputting the off signal for t3 '; if t1 '< tmax' and W1-W2< W3< W1+ W2, the second opening signal digital quantity output channel and the second closing signal digital quantity output channel of the second digital quantity output channel of the controller are both powered off, and the dry steam humidifying valve keeps the current opening degree unchanged.
Has the advantages that:
the invention provides a control system and a control method of a steam heating dry steam humidifying constant temperature and humidity central air conditioner, which replace the use mode that two proportional electric valve actuators are respectively matched with a steam heating valve and a dry steam humidifying valve in the prior art by using a mode that two three-point switch type actuators are respectively matched with the steam heating valve and the dry steam humidifying valve, thereby effectively reducing the production cost of the control system of the steam heating and dry steam humidifying constant temperature and humidity central air conditioner; in addition, the mode that the digital output channel is matched with the three-point switch type actuator is adopted to replace the mode that the analog output channel is matched with the proportional type electric valve actuator in the prior art, so that the production cost of the control system of the steam heating and dry steam humidifying constant-temperature and constant-humidity central air conditioner is further reduced.
Drawings
Fig. 1 is a schematic structural diagram of a control system of a conventional steam heating and dry steam humidifying constant-temperature and constant-humidity central air conditioner;
fig. 2 is a schematic structural diagram of a control system of a steam heating and dry steam humidifying constant-temperature and constant-humidity central air conditioner provided by the invention.
In the figure:
100-a display; 200-a controller; 210-a communication port; 220-first analog input channel; 230-a second analog input channel; 240-first digital output channel; 241-a first on signal digital quantity output channel; 242-first off signal digital quantity output channel; 250-a second digital quantity output channel; 251-a second on signal digital quantity output channel; 252-second off signal digital output channel; 300-a temperature sensor; 400-a humidity sensor; 500-three-point switch type steam heating valve actuator; 600-three-point switch type dry steam humidifying valve actuator; 700 steam heating valve; 800-dry steam humidifying valve.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The invention provides a control system and a control method for a steam heating dry steam humidifying constant-temperature constant-humidity central air conditioner, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail below by referring to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 2, the present invention provides a control system for a steam-heated dry steam-humidified constant-temperature constant-humidity central air conditioner, which includes a display 100, a controller 200, a temperature sensor 300 and a humidity sensor 400, wherein a communication port 210 for connecting the display 100 is disposed inside the controller 200, the controller 200 is provided with a first analog quantity input channel 220 and a second analog quantity input channel 230 which are respectively used for receiving data of the temperature sensor 300 and the humidity sensor 400, and further comprises a three-point switch type steam heating valve actuator 500 with a reset spring arranged therein and a three-point switch type dry steam humidifying valve actuator 600 with a reset spring arranged therein, and a first digital quantity output channel 240 used for transmitting a switching signal to the three-point switch type steam heating valve actuator 500 and a second digital quantity output channel 250 used for transmitting a switching signal to the three-point switch type dry steam humidifying valve actuator 600 are further arranged in the controller 200. In the actual thermostatic control process, the temperature sensor 300 first obtains the actual temperature of the measured area, then the controller 200 receives the temperature data obtained by the temperature sensor 300 through the first analog input channel 220 and analyzes the temperature data, and then transmits the analyzed result to the three-point switch type steam heating valve actuator 500 through the first digital output channel 240 in the form of a signal, and the three-point switch type steam heating valve actuator 500 controls the steam heating valve 700 to act. The constant humidity control process is the same in principle as the constant temperature control process and will not be described in detail herein.
Further, the first digital output channel 240 includes a first on signal digital output channel 241 and a first off signal digital output channel 242, and the first on signal digital output channel 241 and the first off signal digital output channel 242 transmit on and off signals to the three-point switch type steam heating valve actuator 500, respectively.
Further, the second digital output channel 250 comprises a second on signal digital output channel 251 and a second off signal digital output channel 252, and the second on signal digital output channel 251 and the second off signal digital output channel 252 respectively transmit on and off signals to the three-point switch type dry steam humidifying valve actuator 600.
Further, the first digital output channel 240 and the second digital output channel 250 are both implemented by a relay driving circuit. Because the load of the control system is large, the first digital output channel 240 and the second digital output channel 250 are both implemented by using a relay driving circuit.
Specifically, the display 100 is a touch display. This arrangement is to facilitate routine operation.
The invention also provides a control method of the steam heating and dry steam humidifying constant-temperature constant-humidity central air conditioner, which comprises the following steps:
A. a periodic square wave for detecting and comparing temperature and humidity is arranged in the controller through programming, and a set temperature T1, a temperature precision T2, a set humidity W1 and a humidity precision W2 are respectively arranged in the controller through a display;
B. the controller respectively reads data of a temperature sensor and a humidity sensor of a detected area through a first analog quantity input channel and a second analog quantity input channel of the controller to obtain a real-time temperature T3 and a real-time humidity W3;
C. at the moment when the periodic square wave is changed from high level to low level, the controller compares the received real-time temperature T3 with the set temperature T1 and the temperature precision T2 through a control program;
if T3< T1-T2, the controller outputs an opening signal to the three-point switch type steam heating valve actuator through a first opening signal digital output channel of the first digital output channel, and the steam heating valve is opened; if T3> T1+ T2, the controller outputs a closing signal to the three-point switch type steam heating valve actuator through a first closing signal digital output channel of the first digital output channel, and the steam heating valve is closed; if T1-T2< T3< T1+ T2, the first opening signal digital quantity output channel and the first closing signal digital quantity output channel of the first digital quantity output channel of the controller are not electrified, and the steam heating valve keeps the current opening degree unchanged;
when the next periodic square wave comes, controlling circularly according to the condition;
D. at the moment when the periodic square wave is changed from high level to low level, the controller compares the received real-time humidity W3 with the set humidity W1 and the humidity precision W2 through a control program;
if W3< W1-W2, the controller outputs an opening signal to the three-point switch type dry steam humidifying valve actuator through a second opening signal digital output channel of the second digital output channel, and the dry steam humidifying valve is opened; if W3> W1+ W2, the controller outputs a closing signal to the three-point switch type dry steam humidifying valve actuator through a second closing signal digital output channel of the second digital output channel, and the dry steam humidifying valve is closed; if W1-W2< W3< W1+ W2, a second opening signal digital quantity output channel and a second closing signal digital quantity output channel of a second digital quantity output channel of the controller are not electrified, and the dry steam humidifying valve keeps the current opening degree unchanged;
when the next periodic square wave comes, the control is cycled according to the conditions.
Wherein, the step C and the step D can be carried out step by step or synchronously.
Further, the step a further comprises setting an accumulated opening operation time t1 of the steam heating valve, an opening maximum stroke time tmax of the steam heating valve, an output duration t2 of an opening signal output to the three-point switch type steam heating valve actuator and an output duration t3 of an closing signal output to the three-point switch type steam heating valve actuator to the controller through the display, wherein an initial value of t1 is 0, and t1= n t2-m t 3; wherein n and m are natural numbers, wherein n is the number of times that the controller outputs an on signal to the three-point switch type steam heating valve actuator after the central air conditioner is started, and m is the number of times that the controller outputs an off signal to the three-point switch type steam heating valve actuator after the central air conditioner is started; when the central air conditioner is shut down, n and m are restored to 0;
step C also comprises the step that the controller compares the accumulated opening running time t1 of the steam heating valve with the opening maximum travel time tmax of the steam heating valve through a control program;
if T1< tmax and T3< T1-T2, the first open signal digital output channel of the first digital output channel of the controller is powered off after outputting an open signal for T2; if T1< tmax and T3> T1+ T2, the first off signal digital output channel of the first digital output channel of the controller outputs an off signal for T3 and then is powered off; if T1< tmax and T1-T2< T3< T1+ T2, both the first opening signal digital quantity output channel and the first closing signal digital quantity output channel of the first digital quantity output channel of the controller are powered off, and the current opening degree of the steam heating valve is kept unchanged.
It should be noted that the purpose of the setting of the periodic square wave is to improve the control accuracy of the control system for the temperature and the humidity, the shorter the cycle time of the periodic square wave is, the denser the detection comparison times of the control system for the temperature and the humidity are, the higher the control accuracy of the control system for the temperature and the humidity is, when the cycle time of the periodic square wave is short enough, the control system can perform approximately continuous detection comparison on the temperature and the humidity, and the control accuracy of the control system for the temperature and the humidity reaches the highest. T2 represents the output duration of the single output of the on signal to the three-point switch-type steam heating valve actuator, and may be considered as the time required for the opening change process of the opening process of the steam heating valve; t3 represents the duration of the single output of the off signal to the three-point switching steam heating valve actuator, and may be considered as the time required for the opening change process of the closing process of the steam heating valve; for convenience of understanding, the maximum opening of the steam heating valve is set to be 100, and the time required for the opening of the steam heating valve to change from 0 to 100 is set to be 10 seconds, namely tmax = 10; the initial opening of the steam heating valve is 0, when the steam heating valve needs to be opened, and the single opening is designated to be 30, the controller outputs an opening signal to the three-point switch type steam heating valve actuator, and the output duration is 3 seconds, namely the change time of the opening of the steam heating valve from 0 to 30 is 3 seconds, namely t2= 3; then, the steam heating valve needs to be closed, the opening degree of single closing is designated to be 10, the controller outputs a closing signal to the three-point switch type steam heating valve actuator, and the output duration is 1 second, namely the change time of the opening degree of the steam heating valve from 30 to 20 is 1 second, namely t3= 1; at this time, t1= t2-t3=2, and the steam heating valve opening degree is converted to 20, and the maximum opening degree of the steam heating valve is not reached yet. According to the principle, the setting is to stop the relay in the relay driving circuit when the opening of the steam heating valve reaches the maximum opening, so as to protect the relay and prolong the service life of the relay.
Further, the step a further comprises setting an accumulated opening operation time t1 'of the dry steam humidification valve, an opening maximum stroke time tmax' of the dry steam humidification valve, an output duration t2 'of an on signal output to the three-point switch type dry steam humidification valve actuator and an output duration t 3' of an off signal output to the three-point switch type dry steam humidification valve actuator to the controller through the display, wherein an initial value of t1 'is 0, and t 1' = n = t2 '-m = t 3'; wherein n and m are natural numbers, wherein n is the number of times that the controller outputs an on signal to the three-point switch type dry steam humidifying valve actuator after the central air conditioner is started, and m is the number of times that the controller outputs an off signal to the three-point switch type dry steam humidifying valve actuator after the central air conditioner is started; when the central air conditioner is shut down, n and m are restored to 0;
step D also comprises the step that the controller compares the accumulated opening running time t1 'of the dry steam humidifying valve with the opening maximum travel time tmax' of the dry steam humidifying valve through a control program;
if t1 ' < tmax ' and W3< W1-W2, the second on signal digital output channel of the second digital output channel of the controller is powered off after outputting the on signal for t2 '; if t1 ' < tmax ' and W3> W1+ W2, the second off signal digital output channel of the second digital output channel of the controller is powered off after outputting the off signal for t3 '; if t1 '< tmax' and W1-W2< W3< W1+ W2, the second opening signal digital quantity output channel and the second closing signal digital quantity output channel of the second digital quantity output channel of the controller are both powered off, and the dry steam humidifying valve keeps the current opening degree unchanged.
The setting principles of t1 ', t 2', t3 'and tmax' are the same as those of t1, t2, t3 and tmax, and are not described in detail here.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.
Claims (4)
1. A control method of a steam heating dry steam humidifying constant temperature and humidity central air conditioner comprises a display, a controller, a temperature sensor and a humidity sensor, wherein a communication port used for being connected with the display is arranged in the controller, a first analog quantity input channel and a second analog quantity input channel which are used for receiving data of the temperature sensor and the humidity sensor respectively are arranged in the controller, the controller further comprises a three-point switch type steam heating valve actuator provided with a reset spring and a three-point switch type dry steam humidifying valve actuator provided with a reset spring, a first digital quantity output channel used for transmitting opening and closing signals to the three-point switch type steam heating valve actuator and a second digital quantity output channel used for transmitting opening and closing signals to the three-point switch type dry steam humidifying valve actuator are also arranged in the controller;
the first digital output channel comprises a first open signal digital output channel and a first closed signal digital output channel, and the first open signal digital output channel and the first closed signal digital output channel respectively transmit open and closed signals to the three-point switch type steam heating valve actuator;
the second digital output channel comprises a second open signal digital output channel and a second closed signal digital output channel, and the second open signal digital output channel and the second closed signal digital output channel respectively transmit open and closed signals to the three-point switch type dry steam humidifying valve actuator;
it is characterized in that the preparation method is characterized in that,
the method comprises the following steps:
A. a periodic square wave for detecting and comparing temperature and humidity is arranged in the controller through programming, and a set temperature T1, a temperature precision T2, a set humidity W1 and a humidity precision W2 are respectively arranged in the controller through a display;
B. the controller respectively reads data of a temperature sensor and a humidity sensor of a detected area through a first analog quantity input channel and a second analog quantity input channel of the controller to obtain a real-time temperature T3 and a real-time humidity W3;
C. at the moment when the periodic square wave is changed from high level to low level, the controller compares the received real-time temperature T3 with the set temperature T1 and the temperature precision T2 through a control program;
if T3< T1-T2, the controller outputs an opening signal to the three-point switch type steam heating valve actuator through a first opening signal digital output channel of the first digital output channel, and the steam heating valve is opened; if T3> T1+ T2, the controller outputs a closing signal to the three-point switch type steam heating valve actuator through a first closing signal digital output channel of the first digital output channel, and the steam heating valve is closed; if T1-T2< T3< T1+ T2, the first opening signal digital quantity output channel and the first closing signal digital quantity output channel of the first digital quantity output channel of the controller are not electrified, and the steam heating valve keeps the current opening degree unchanged;
when the next periodic square wave comes, controlling circularly according to the condition;
D. at the moment when the periodic square wave is changed from high level to low level, the controller compares the received real-time humidity W3 with the set humidity W1 and the humidity precision W2 through a control program;
if W3< W1-W2, the controller outputs an opening signal to the three-point switch type dry steam humidifying valve actuator through a second opening signal digital output channel of the second digital output channel, and the dry steam humidifying valve is opened; if W3> W1+ W2, the controller outputs a closing signal to the three-point switch type dry steam humidifying valve actuator through a second closing signal digital output channel of the second digital output channel, and the dry steam humidifying valve is closed; if W1-W2< W3< W1+ W2, a second opening signal digital quantity output channel and a second closing signal digital quantity output channel of a second digital quantity output channel of the controller are not electrified, and the dry steam humidifying valve keeps the current opening degree unchanged;
when the next periodic square wave comes, controlling circularly according to the condition;
the step A also comprises setting accumulated opening running time t1 of a steam heating valve, maximum opening travel time tmax of the steam heating valve, output duration t2 of an opening signal output to the three-point switch type steam heating valve actuator and output duration t3 of an closing signal output to the three-point switch type steam heating valve actuator respectively to the controller through a display, wherein the initial value of t1 is 0, and t1 is n t2-m t 3;
the step C also comprises the step that the controller compares the accumulated opening running time t1 of the steam heating valve with the maximum opening stroke time tmax of the steam heating valve through a control program;
if T1< tmax and T3< T1-T2, the first open signal digital output channel of the first digital output channel of the controller is powered off after outputting an open signal for T2; if T1< tmax and T3> T1+ T2, the first off signal digital output channel of the first digital output channel of the controller outputs an off signal for T3 and then is powered off; if T1< tmax and T1-T2< T3< T1+ T2, both the first opening signal digital quantity output channel and the first closing signal digital quantity output channel of the first digital quantity output channel of the controller are powered off, and the current opening degree of the steam heating valve is kept unchanged.
2. The control method of the steam heating dry steam humidifying constant temperature and humidity central air conditioner as claimed in claim 1, wherein the first digital output channel and the second digital output channel are both realized by a relay driving circuit.
3. The control method of the steam heating dry steam humidifying constant-temperature constant-humidity central air conditioner as claimed in claim 1, wherein the display is a touch display.
4. The control method of the steam heating dry steam humidifying constant temperature and humidity central air conditioner as claimed in claim 1, wherein the step a further comprises setting an accumulated opening operation time t1 'of a dry steam humidifying valve, an opening maximum stroke time tmax' of the dry steam humidifying valve, an output duration t2 'of an on signal to the three-point switch type dry steam humidifying valve actuator and an output duration t 3' of an off signal to the three-point switch type dry steam humidifying valve actuator, respectively, to the controller through the display, wherein the initial value of t1 'is 0, and t 1' ═ n t2 '-m \ t 3';
step D also comprises the step that the controller compares the accumulated opening running time t1 'of the dry steam humidifying valve with the opening maximum travel time tmax' of the dry steam humidifying valve through a control program;
if t1 ' < tmax ' and W3< W1-W2, the second on signal digital output channel of the second digital output channel of the controller is powered off after outputting the on signal for t2 '; if t1 ' < tmax ' and W3> W1+ W2, the second off signal digital output channel of the second digital output channel of the controller is powered off after outputting the off signal for t3 '; if t1 '< tmax' and W1-W2< W3< W1+ W2, the second opening signal digital quantity output channel and the second closing signal digital quantity output channel of the second digital quantity output channel of the controller are both powered off, and the dry steam humidifying valve keeps the current opening degree unchanged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810578982.0A CN108826586B (en) | 2018-06-07 | 2018-06-07 | Control system and control method for steam heating dry steam humidifying constant-temperature constant-humidity central air conditioner |
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