CN103235621B - Mist-preventing intelligent control system for cabinet - Google Patents

Mist-preventing intelligent control system for cabinet Download PDF

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Publication number
CN103235621B
CN103235621B CN201310154005.5A CN201310154005A CN103235621B CN 103235621 B CN103235621 B CN 103235621B CN 201310154005 A CN201310154005 A CN 201310154005A CN 103235621 B CN103235621 B CN 103235621B
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cabinet
temperature
humidity
condensation
humidity controller
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CN103235621A (en
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张龙飞
孟玖林
何浩
刘影月
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Chengdu Sihan Technology Co ltd
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CHENGDU SIHAN TECHNOLOGY Co Ltd
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Abstract

The invention discloses a mist-preventing intelligent control system for a cabinet. The mist-preventing intelligent control system comprises a temperature and humidity controller arranged inside the cabinet, a dehumidification device, a communication node and an environment temperature detector arranged outside the cabinet, wherein the environment temperature detector is used for acquiring the temperature outside the cabinet; the temperature and humidity controller is used for acquiring the temperature and humidity inside the cabinet; and the temperature and humidity controller is used for respectively calculating saturated vapor pressure outside the cabinet and saturated vapor pressure inside the cabinet at current time according to the temperature outside the cabinet and the temperature inside the cabinet, calculating a mist value inside the cabinet at current time, and turns on/off the dehumidification device according to the mist value. By the adoption of the system, mist-preventing control is realized; the saturated vapor pressures inside and outside the cabinet at current time are calculated, the mist value for generating mist inside the cabinet at current time is calculated according to the saturated vapor pressures inside and outside the cabinet, and whether the dehumidification device is turned on/off is judged according to the mist value at current time, so that the system has the advantages of timeliness and flexibility, and the mist-preventing control is well realized.

Description

The anti-condensation intelligent control system of a kind of cabinet
Technical field
The present invention relates to anti-condensation control technology field, particularly the anti-condensation intelligent control system of a kind of cabinet.
Background technology
In electric system, in the cabinet that various power distribution cabinet, switch board, terminal box, operating mechanism case etc. are closed, a large amount of electric elements are installed, if the air humidity in cabinet reaches certain proportion, condensation can be produced at a certain temperature, be attached to electric elements surface for a long time, easy corrosion electric elements, even because of creepage, short circuit, the reason such as to puncture and cause the accident, the safety of serious threat electric system.And a lot of electric elements have certain requirement to environment temperature, the performance that all can affect electrical equipment too high or too low for temperature, therefore needs a set of anti-condensation control system, controls humiture in cabinet, avoids producing dew condensation phenomenon.
The control principle of the anti-condensation control system that current use is more is: when the humiture in cabinet exceeds the warm and humid angle value of setting, utilizes firing equipment to carry out heating and dehumidification, and the humiture in control cabinet is in certain scope.The defect that the anti-condensation control system of this control principle exists is, only considered that cabinet internal temperature is too low, humidity is crossed conference and caused condensation, and but have ignored the inside and outside temperature difference of cabinet is also one of reason producing dew condensation phenomenon.Cabinet external temperature then can reduce cabinet internal temperature lower than cabinet internal temperature because of heat transfer process, even if therefore cabinet internal temperature also may occur dew condensation phenomenon in the temperature range of setting, anti-condensation effect is not good.
Anti-condensation control system less is at present provided with ambient temperature sensor outside cabinet, for gathering the environment temperature outside cabinet, avoids the condensation caused due to the inside and outside temperature difference of cabinet.Its control principle is: compare after acquiring the inside and outside temperature of cabinet, if the inside and outside temperature difference of cabinet exceedes certain value of setting, then starts or stops firing equipment heating, reducing the temperature difference that body is inside and outside.The warm and humid angle value realizing preventing the effect of condensation from setting than simple control by setting the inside and outside temperature gap of cabinet simultaneously realizes anti-condensation better effects if, but still there is drawback.Because the saturated vapor pressure under different temperatures is different, namely the condensation value producing dew condensation phenomenon is different, and the temperature gap of setting is a fixing value, does not have dirigibility, can not control cabinet internal temperature flexibly because of the real-time change of environment saturated vapor pressure, anti-condensation effect is not good yet.
Summary of the invention
The object of the invention is to overcome the deficiency that anti-condensation effect existing in prior art is poor, a kind of anti-condensation intelligent control system of cabinet of carrying out anti-condensation control according to current time condensation value is provided.
In order to realize foregoing invention object, the invention provides following technical scheme:
The anti-condensation intelligent control system of a kind of cabinet, comprise the temperature and humidity controller, dehydrating unit and the communication node that are installed on cabinet inside, also comprise the ambient temperature sensor being installed on cabinet outside, described dehydrating unit and communication node are all electrically connected with temperature and humidity controller, described ambient temperature sensor and communication node wireless connections;
The cabinet external temperature collected is transferred to temperature and humidity controller by communication node by described ambient temperature sensor, described temperature and humidity controller gathers cabinet internal temperature and humidity, and temperature and humidity controller calculates the outside saturated vapor pressure P of current time cabinet respectively according to cabinet external temperature and cabinet internal temperature 1with cabinet inside saturated vapor pressure P 0, then according to P 0and P 1calculate the condensation value of current time cabinet inside, temperature and humidity controller is according to condensation value On/Off dehydrating unit.
According to the embodiment of the present invention, the saturated vapor pressure P of described cabinet inside 0=exp (A+B/T 0+ C*ln (T 0)+D* T 0^E), the saturated vapor pressure P of described cabinet outside 1=exp (A+B/ T 1+ C*ln (T 1)+D* T 1^E), described condensation value=P 1/ P 0, wherein, A=73.649, B=-7258.2, C=-7.3037, D=4.1653E-06, E=2, T 0for cabinet internal temperature, T 1for cabinet external temperature.
According to the embodiment of the present invention, if cabinet inner current humidity > condensation Zhi – humidity alert threshold, then start dehydrating unit and dehumidify; If cabinet inner current humidity > condensation Zhi – humidity secure threshold, then close dehydrating unit.Described humidity alert threshold is 7 ~ 12, and described humidity secure threshold is 18 ~ 25.
Preferably, described temperature and humidity controller passes through I 2c bus is connected with current detecting unit, and described current detecting unit is electrically connected with dehydrating unit.Detect dehydrating unit by the working current of monitoring dehydrating unit whether normally to work.
Preferably, described temperature and humidity controller comprises the Temperature Humidity Sensor for gathering cabinet internal temperature and humidity, and described Temperature Humidity Sensor is at least two.
compared with prior art, beneficial effect of the present invention: present system adopts Intelligent dehumidifying mode to realize anti-condensation control, and described Intelligent dehumidifying mode is; The cabinet external temperature that ambient temperature sensor collects, temperature and humidity controller gathers cabinet internal temperature and humidity, first temperature and humidity controller calculates the saturated vapor pressure in current time cabinet outside saturated vapor pressure and cabinet, saturated vapor pressure inside and outside according to cabinet again calculates the condensation value that current time cabinet inside produces condensation, judge whether to start or stop dehydrating unit according to current time condensation value, there is ageing, dirigibility, anti-condensation control can well be realized.
Accompanying drawing illustrates:
Fig. 1 is the composition structured flowchart of the anti-condensation intelligent control system of cabinet of the present invention.
Fig. 2 is the process flow diagram of Intelligent dehumidifying mode.
Embodiment
Below in conjunction with test example and embodiment, the present invention is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment, all technology realized based on content of the present invention all belong to scope of the present invention.
With reference to figure 1, the anti-condensation intelligent control system of a kind of cabinet that this reality is invented to be provided is applied to the cabinet that switch cubicle, terminal box etc. need to carry out Temperature and Humidity Control.The anti-condensation intelligent control system of the present invention comprises temperature and humidity controller, ambient temperature sensor, dehydrating unit and communication node, wherein, temperature and humidity controller and dehydrating unit are installed in cabinet, ambient temperature sensor is installed on outside cabinet, dehydrating unit is all connected with temperature and humidity controller with communication node, ambient temperature sensor and communication node wireless connections.
Dehydrating unit driving circuit, power supply unit and Temperature Humidity Sensor that temperature and humidity controller comprises central processing unit and is connected with central processing unit, central processing unit drives dehydrating unit work by dehydrating unit driving circuit.Temperature Humidity Sensor is for gathering the inner humiture of cabinet, and the number of Temperature Humidity Sensor can be multiple, then gets the mean value of multiple Temperature Humidity Sensor, and the humiture parameter of collection can be made so more accurate.In the present embodiment, adopt two Temperature Humidity Sensors.Temperature and humidity controller also comprises LCD display, pilot lamp and button.LCD display is for showing the humiture of cabinet inside.Button is used for carrying out artificial control to temperature and humidity controller, and such as hand-guided temperature and humidity controller starts or closes dehydrating unit work.Pilot lamp is used to indicate the duty of temperature and humidity controller.Temperature and humidity controller is also provided with configured port, can realize carrying out parameter configuration or program upgrade to temperature and humidity controller by configured port.
Dehydrating unit comprises blower fan and heating plate, and the heat that blower fan is used for heating plate discharges is distributed to cabinet inside fast, uniformly, and the homogeneous temperature of cabinet inside is raised.The central processing unit of temperature and humidity controller passes through I 2c bus is connected with current detecting unit, and current detecting unit is electrically connected with dehydrating unit, for detecting the working current of dehydrating unit, judges whether dehydrating unit breaks down, and avoids realizing condensation because dehydrating unit breaks down and controls.Gather total current when heating plate and blower fan real work, total current and theoretical current (theoretical current is the rated current of blower fan and the rated current sum of heating plate) are compared, if the rated current of theoretical current-total current=heating plate, then illustrate that blower fan does not work, blower fan breaks down; If the rated current of theoretical current-total current=blower fan, then illustrate that heating plate does not work, heating plate breaks down.It should be noted that to realize fault detect, the blower fan of employing and the power of heating plate should be different.Detection cell circuit technology is ripe, is not repeating herein.
In the present embodiment, described communication node is Zigbee node, and Zigbee node is connected with temperature and humidity controller by UART232 interface.
With reference to figure 2, the anti-condensation intelligent control system of the present invention can realize Intelligent dehumidifying mode and carry out anti-condensation control.Intelligent dehumidifying mode refers to temperature and humidity controller controls whether start dehydrating unit work according to cabinet inside current humiture parameter and current condensation value.Humiture in cabinet is different, and the saturated vapor pressure under identical atmospheric pressure is just different, and the steam vapour amount in space air exceeds saturated vapor pressure, will form liquid state, namely produce condensation.Temperature Humidity Sensor transfers to central processing unit after gathering the humiture of the inner current time of cabinet, ambient temperature sensor gathers the temperature of the outside current time of cabinet, then Zigbee node-node transmission is passed through to central processing unit, central processing unit calculates the saturated vapor pressure P1 outside the saturated vapor pressure P0 of the cabinet inside of current time and cabinet according to P (Pa)=exp (A+B/T+C*ln (T)+D*T^E), and cabinet inside produces the saturated vapor pressure in the saturated vapor pressure/cabinet outside the condensation value=cabinet of dew condensation phenomenon.Temperature and humidity controller and then determine whether to open or close dehydrating unit according to the humidity of current time cabinet inside: if cabinet inner current humidity > condensation Zhi – 10(10 is humidity alert threshold herein, the value of humidity alert threshold can be one in 7 ~ 12), then start dehydrating unit and dehumidify; If cabinet inner current humidity > condensation value-20(20 be humidity secure threshold herein, the value of humidity secure threshold can be one in 18 ~ 25), then close dehydrating unit, stop dehumidifying.Wherein A=73.649, B=-7258.2, C=-7.3037, D=4.1653E-06(4.1653E-06 represent 4.1653 × 10 -6), E=2, T are Richter scale temperature (temperature range is 273.16 ~ 647.13K, namely 0 DEG C to 373.98 DEG C), and P is saturated vapour pressure, and unit is Pa.When getting the temperature outside cabinet as T, the P calculated is the saturated vapor pressure P outside cabinet 1; When T gets the temperature of cabinet inside, the P calculated is the saturated vapor pressure P of cabinet inside 0.
Adopt Intelligent dehumidifying mode can calculate the inside and outside saturated vapor pressure of current time cabinet, and then calculate the condensation value that current time cabinet inside produces condensation, judge whether to start or stop dehydrating unit according to current time condensation value, there is ageing, dirigibility, can ensure that in cabinet, humiture is outside condensation value at any time, avoid dew condensation phenomenon to occur, well achieve anti-condensation control.
Certainly, the manual dehumidification mode that present system can also realize often using at present carries out anti-condensation control with acquiescence dehumidification mode.Manual dehumidification mode refers to manually or carries out by the start/stop dehydrating unit that sends instructions under network the dehumidifying that dehumidifies/stop.Acquiescence dehumidification mode refers to and is stored in the central processing unit of temperature and humidity controller by the temperature difference of setting and Threshold of Temperature And Humidity in advance, when the inner humiture of cabinet reaches the Threshold of Temperature And Humidity of setting, or when cabinet inside and outside temperature difference reaches the temperature difference of setting, temperature and humidity controller dehumidifies with regard to starting dehydrating unit, when the inner humiture of cabinet returns to safe range, (safe range refers to the temperature humidity range of the setting that dew condensation phenomenon does not occur, the threshold value of humiture safe range is Threshold of Temperature And Humidity) time, control dehydrating unit and quit work.
The anti-condensation intelligent control system of the present invention provides three kinds of dehumidification modes, and three kinds of dehumidification modes can be selected arbitrarily, but as optimum embodiment, first Intelligent dehumidifying mode is adopted, enable acquiescence dehumidification mode again when Intelligent dehumidifying mode loses efficacy, finally just enable manual dehumidification mode when giving tacit consent to dehumidification mode and losing efficacy.
All features disclosed in this instructions, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this instructions (comprising any accessory claim, summary and accompanying drawing), unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.

Claims (3)

1. the anti-condensation intelligent control system of cabinet, comprise the temperature and humidity controller, dehydrating unit and the communication node that are installed on cabinet inside, also comprise the ambient temperature sensor being installed on cabinet outside, described dehydrating unit and communication node are all electrically connected with temperature and humidity controller, described ambient temperature sensor and communication node wireless connections; It is characterized in that,
The cabinet external temperature collected is transferred to temperature and humidity controller by communication node by described ambient temperature sensor, described temperature and humidity controller gathers cabinet internal temperature and humidity, and temperature and humidity controller calculates the outside saturated vapor pressure P of current time cabinet respectively according to cabinet external temperature and cabinet internal temperature 1with cabinet inside saturated vapor pressure P 0, then according to P 0and P 1calculate the condensation value of current time cabinet inside, temperature and humidity controller is according to condensation value On/Off dehydrating unit;
The inner saturated vapor pressure P of described cabinet 0=exp (A+B/T 0+ C*ln (T 0)+D*T 0^E), the outside saturated vapor pressure P of described cabinet 1=exp (A+B/T 1+ C*ln (T 1)+D*T 1^E), described condensation value=P 1/ P 0, wherein, A=73.649, B=-7258.2, C=-7.3037, D=4.1653 × 10 -6, E=2, T 0for cabinet internal temperature, T 1for cabinet external temperature, T 0and T 1for Richter scale temperature;
If cabinet inner current humidity > condensation Zhi – humidity alert threshold, then start dehydrating unit and dehumidify; If cabinet inner current humidity > condensation Zhi – humidity secure threshold, then close dehydrating unit;
Described humidity alert threshold is 7 ~ 12, and described humidity secure threshold is 18 ~ 25.
2. the anti-condensation intelligent control system of cabinet according to claim 1, is characterized in that, described temperature and humidity controller passes through I 2c bus is connected with current detecting unit, and described current detecting unit is electrically connected with dehydrating unit.
3. the anti-condensation intelligent control system of cabinet according to claim 1, is characterized in that, described temperature and humidity controller comprises the Temperature Humidity Sensor for gathering cabinet internal temperature and humidity, and described Temperature Humidity Sensor is at least two.
CN201310154005.5A 2013-04-28 2013-04-28 Mist-preventing intelligent control system for cabinet Active CN103235621B (en)

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Families Citing this family (10)

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CN104460787A (en) * 2014-11-06 2015-03-25 无锡科思电子科技有限公司 Damproof control method for electric control cabinet
CN104407651A (en) * 2014-11-06 2015-03-11 无锡科思电子科技有限公司 Moisture-proof electrical control cabinet matched with refrigeration system
CN104375543A (en) * 2014-12-09 2015-02-25 国网上海市电力公司 Internal temperature and humidity measurement method of power distribution cabinet
CN104597951A (en) * 2015-02-11 2015-05-06 山东明科电气技术有限公司 Temperature and humidity monitoring control device of air-cooled generator and monitoring control method of temperature and humidity monitoring control device
CN105259951A (en) * 2015-11-15 2016-01-20 科大智能电气技术有限公司 Intelligent temperature controller and intelligent temperature controller system applied to power distribution cabinet temperature monitoring
WO2018059883A1 (en) 2016-09-30 2018-04-05 Belimo Holding Ag Hvac actuator with heating apparatus
CN109451704A (en) * 2018-11-05 2019-03-08 辽宁中天智控技术有限公司 A kind of cabinet dewing-proof method and its device
CN110499133B (en) * 2019-08-21 2021-03-30 宿州鹏御源新材料科技有限公司 Solvent-free leather adhesive and preparation method thereof
CN112986805B (en) * 2021-05-19 2021-08-10 湖南博匠信息科技有限公司 Intelligent VPX board card testing method and system
CN113432638A (en) * 2021-05-20 2021-09-24 柳州欧维姆机械股份有限公司 Cable condensation state monitoring method

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CN202711099U (en) * 2012-07-25 2013-01-30 成都思晗科技有限公司 Anti-condensation control system of transformer substation

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CN202711099U (en) * 2012-07-25 2013-01-30 成都思晗科技有限公司 Anti-condensation control system of transformer substation

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