CN101737900A - Method and device for feedback control of air quantity of central air conditioner - Google Patents
Method and device for feedback control of air quantity of central air conditioner Download PDFInfo
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- CN101737900A CN101737900A CN200910155841A CN200910155841A CN101737900A CN 101737900 A CN101737900 A CN 101737900A CN 200910155841 A CN200910155841 A CN 200910155841A CN 200910155841 A CN200910155841 A CN 200910155841A CN 101737900 A CN101737900 A CN 101737900A
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Abstract
The invention discloses a method and a device for feedback control of the air quantity of a central air conditioner, which relates to a control technique for the central air conditioner. An existing air conditioner has an overlarge air quantity, wastes energy sources, blows hot and cold in turn and has a poor indoor comfort level. The method comprises the following steps of: 1) performing detection, namely detecting the air quantity at an outlet of a fan coil unit by a air quantity detection device, and measuring the indoor temperature by a temperature detection device; 2) performing air quantity calculation, namely, comparing the actual temperature with a set temperature to obtain the difference value of the actual temperature and the set temperature, and calculating the needed air quantity according to the temperature difference value; 3) performing air quantity compensation, namely, comparing the actual air quantity with the needed air quantity to obtain the difference value of the actual air quantity and the needed air quantity, calculating the rotating speed of a fan motor according to the air quantity difference value, and compensating the air quantity; and 4) performing regulation, namely performing the regulation according to the calculated rotating speed of the fan motor, and returning to the step 1) for circulation. The method and the device use a PI regulating unit to regulate the rotating speed of the motor so as to regulate the output air quantity, realize the double closed-loop control of the temperature and the air quantity, and achieve the effects of improving the comfort level and saving energy.
Description
[technical field]
The present invention relates to the control technology of central air-conditioning, particularly about the control method and the device of the air quantity of central air-conditioning feedback.
[background technology]
Fan coil is the device of the normal a kind of air quantity transmission adopted of central air-conditioning at present, is installed in usually on the ceiling in room, and the air-flow of generation uniform temperature is regulated the temperature in the room, and a kind of comfortable environment temperature is provided.
Fig. 1 promptly shows the schematic diagram structural form of existing one group of fan coil control system, and its basic structure comprises controller, blower fan, coil pipe, stop valve, temperature sensor.
Basically, mainly setting in the central air-conditioning according to room temperature, rapid adjustment goes out suitable air quantity and changes indoor temperature, if but air quantity is suddenly big or suddenly small, can influence the comfort level in room, if air quantity control simultaneously is improper, also can waste a lot of energy.
For reaching the solution commonly used of regulating indoor temperature is that several grades of rotating speeds of control motor adjust several grades air quantity.The shortcoming of this way is, actual air output is unclear, can only regulate air quantity according to motor speed, and have nothing in common with each other according to the stringing of actual conditions in the air channel, this just causes the same motor speed, air output is to have nothing in common with each other, can only adjust indoor temperature by transferring maximum (top) speed, cause air quantity excessive, energy waste, sometimes hot and sometimes cold, indoor comfort level obviously descends.
[summary of the invention]
The technical assignment of the technical problem to be solved in the present invention and proposition is to overcome prior art scheme shortcoming, and a kind of air quantity feedback and device of central air-conditioning is provided, to reach the rapid adjustment of air quantity, the purpose of continual and steady work.For this reason, the present invention takes following technical scheme:
The air quantity feedback of central air-conditioning, described central air-conditioning comprises blower motor, coil pipe, it is characterized in that it may further comprise the steps:
1) detects step, detect fan coil exit air quantity, measure indoor temperature by temperature-detecting device by the air quantity checkout gear that is installed in the coil pipe exit;
2) Wind Coverage Calculation step, actual temperature that detection is obtained and design temperature compare and draw both differences, calculate institute's required airflow according to temperature gap;
3) air quantity compensation process, actual air volume and institute's required airflow that detection is obtained compare, and draw both differences, and the rotating speed according to air quantity difference calculating blower motor compensates air quantity;
4) set-up procedure is adjusted according to the blower motor rotating speed that calculates gained, is back to the step 1) circulation.
Utilize the air quantity checkout gear, and with air quantity as feedback control parameters, to adopt close-loop control mode to replace the open loop control mode of motor rotary speed by empirical value, the air output fast and stable of realizing control central air-conditioning fan coil reaches the purpose in the control range, avoids that air quantity is excessive, energy waste, sometimes hot and sometimes cold situation take place.
As the further of technique scheme improved and replenish, the present invention also comprises following additional technical feature:
Calculate the adjustment rotating speed of blower motor according to the air quantity difference by air quantity PI control module.
Calculate institute's required airflow by temperature PI control module according to temperature gap.
Blower motor reaches the purpose of air quantity PI control module control blower motor rotating speed by the blower fan drive unit drives that is connected with air quantity PI control module.
The air quantity feedback device of central air-conditioning, described central air-conditioning comprises blower motor, coil pipe and controller, it is characterized in that: the air quantity feedback device comprises
Be located at the air quantity checkout gear that the coil pipe outlet is used to detect air quantity;
Be used to detect the temperature-detecting device of indoor temperature;
Be used for calculating the temperature PI control module of required airflow value according to the difference of preset temperature and room actual temperature;
The difference that is used for the required airflow value that the actual air volume value that obtains according to the air quantity checkout gear and temperature PI control module calculate is calculated the air quantity PI control module of the rotating speed controlling value of blower motor.Utilize the PI regulon, adjust motor speed, adjust discharge quantity of fan whereby, realize two closed-loop controls of temperature and air quantity, reach the raising comfort level, energy-conservation effect.
Described temperature PI control module and air quantity PI control module all are located in the controller.Adopt software to realize PI control, reduce cost.
Described air quantity PI control module is by a blower fan driver element control blower motor rotating speed of being located in the controller.Blower motor is the stepless time adjustment motor, and air quantity PI control module is regulated air quantity in real time, reaches steady, accurate, fast control air quantity purpose.
Described temperature, air quantity checkout gear signal output signal feed back to corresponding PI control module by connecting line.Realize closed-loop control.
Beneficial effect:
Utilize the PI regulon, adjust motor speed, adjust discharge quantity of fan whereby, realize two closed-loop controls of temperature and air quantity, reach the raising comfort level, energy-conservation effect.
[description of drawings]
Fig. 1 is existing fan coil pipe structure schematic diagram;
Fig. 2 is an application structure schematic diagram of the present invention;
Fig. 3 is a theory structure schematic diagram of the present invention;
Fig. 4 A is the air quantity control curve map that adopts prior art;
Fig. 4 B adopts air quantity control curve map of the present invention.
[specific embodiment]
Below in conjunction with Figure of description technical scheme of the present invention is described in further detail.
Shown in Fig. 2,3, the air quantity feedback device of central air-conditioning, central air-conditioning comprises blower motor, coil pipe and controller, and the air quantity feedback device comprises air quantity checkout gear, the temperature-detecting device that is used to detect indoor temperature being located at coil pipe outlet and being used to detect air quantity, be used for calculating the air quantity PI control module that the temperature PI control module of required airflow value, the difference that is used for the required airflow value that the actual air volume value that obtains according to the air quantity checkout gear and temperature PI control module calculate calculate the rotating speed controlling value of blower motor according to the difference of preset temperature and room actual temperature.Wherein temperature PI control module and air quantity PI control module all are located in the controller.Air quantity PI control module is by a blower fan driver element control blower motor rotating speed of being located in the controller.Temperature, air quantity checkout gear signal output signal feed back to corresponding PI control module by connecting line.
The air quantity feedback step of central air-conditioning is:
1) detects step, detect fan coil exit air quantity, measure indoor temperature by temperature-detecting device by the air quantity checkout gear that is installed in the coil pipe exit;
2) Wind Coverage Calculation step, actual temperature that detection is obtained and design temperature compare and draw both differences, and temperature PI control module calculates institute's required airflow according to temperature gap;
3) air quantity compensation process, actual air volume and institute's required airflow that detection is obtained compare, and draw both differences, and air quantity PI control module compensates air quantity according to the rotating speed of air quantity difference calculating blower motor;
4) set-up procedure, electric-motor drive unit is adjusted according to the blower motor rotating speed that calculates gained; Be back to the step 1) circulation.
Fig. 4 A, 4B are performance diagrams, contrast shows the curve of existing control method and the air quantity control of control method of the present invention, and only there is large, medium and small third gear in Fig. 4 A air quantity, reach the stall of temperature range blower motor or switch height, in, low-rotate speed, make air quantity cut in and out, the time little when big, temperature fluctuation is big, and in Fig. 4 B, air quantity is constantly with the temperature adjustment, after reaching room temperature fast, air quantity and temperature fluctuation are little, and that indoor basic maintenance constant temperature, air quantity change is little, effectively improve comfort level.
Claims (8)
1. the air quantity feedback of central air-conditioning, described central air-conditioning comprises blower motor, coil pipe, it is characterized in that control method may further comprise the steps:
1) detects step, detect fan coil exit air quantity, measure indoor temperature by temperature-detecting device by the air quantity checkout gear that is installed in the coil pipe exit;
2) Wind Coverage Calculation step, actual temperature that detection is obtained and design temperature compare and draw both differences, and calculate institute's required airflow according to temperature gap;
3) air quantity compensation process, actual air volume and institute's required airflow that detection is obtained compare, and draw both differences, and calculate the rotating speed of blower motor according to the air quantity difference, and air quantity is compensated;
4) set-up procedure is adjusted according to the blower motor rotating speed that calculates gained; Be back to the step 1) circulation.
2. the air quantity feedback of central air-conditioning according to claim 1 is characterized in that: the adjustment rotating speed that is calculated blower motor by air quantity PI control module according to the air quantity difference.
3. the air quantity feedback of central air-conditioning according to claim 1 is characterized in that: calculate institute's required airflow by temperature PI control module according to temperature gap.
4. the air quantity feedback of central air-conditioning according to claim 2 is characterized in that: blower motor reaches the purpose of air quantity PI control module control blower motor rotating speed by the blower fan drive unit drives that is connected with air quantity PI control module.
5. the air quantity feedback device of central air-conditioning, described central air-conditioning comprises blower motor, coil pipe and controller, it is characterized in that: the air quantity feedback device comprises
Be located at the air quantity checkout gear that the coil pipe outlet is used to detect air quantity;
Be used to detect the temperature-detecting device of indoor temperature;
Be used for calculating the temperature PI control module of required airflow value according to the difference of preset temperature and room actual temperature;
The difference that is used for the required airflow value that the actual air volume value that obtains according to the air quantity checkout gear and temperature PI control module calculate is calculated the air quantity PI control module of the rotating speed controlling value of blower motor.
6. the air quantity feed back control system of central air-conditioning according to claim 5, it is characterized in that: described temperature PI control module and air quantity PI control module all are located in the controller.
7. the air quantity feedback and the device of central air-conditioning according to claim 6 is characterized in that: described air quantity PI control module is by a blower fan driver element control blower motor rotating speed of being located in the controller.
8. the air quantity feed back control system of central air-conditioning according to claim 7, it is characterized in that: described temperature, air quantity checkout gear signal output signal feed back to corresponding PI control module by connecting line.
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| CN2009101558419A CN101737900B (en) | 2009-12-29 | 2009-12-29 | Method and device for feedback control of air quantity of central air conditioner |
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| CN2009101558419A CN101737900B (en) | 2009-12-29 | 2009-12-29 | Method and device for feedback control of air quantity of central air conditioner |
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| CN101737900B CN101737900B (en) | 2012-07-04 |
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