CN201302260Y - Intelligent central air conditioner closed loop control system - Google Patents
Intelligent central air conditioner closed loop control system Download PDFInfo
- Publication number
- CN201302260Y CN201302260Y CNU200820204079XU CN200820204079U CN201302260Y CN 201302260 Y CN201302260 Y CN 201302260Y CN U200820204079X U CNU200820204079X U CN U200820204079XU CN 200820204079 U CN200820204079 U CN 200820204079U CN 201302260 Y CN201302260 Y CN 201302260Y
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- air conditioner
- frequency converter
- plc controller
- air
- fans
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- Air Conditioning Control Device (AREA)
Abstract
The utility model relates to an air conditioner control system, in particular to an intelligent central air conditioner closed loop control system, which comprises a PC working station, a PLC controller, frequency converters, air conditioner fans and temperature transducers. The PC working station is connected with the PLC controller, the amount of the air conditioner fans can be one or more, the amount of frequency converters and the temperature transducers can be one or more matching with the air conditioner fans, each air conditioner fan is connected with the PLC controller via one frequency converter, and each temperature transducer is connected with the PLC controller via one frequency converter. The intelligent central air conditioner closed loop control system manages the fans intelligently and intensively and plays group control to the plant units, thereby increasing temperature control precision. Besides, redundant spare fans are used in turns according to the procedure, thereby enabling components of the plant unit to be average in wear, preventing the spare equipment getting rust and prolonging the service life of the plant unit. Further, the fans can be real-time monitored remotely, thereby guaranteeing safe running of the air conditioner.
Description
Technical field
The utility model relates to a kind of air-conditioner control system, specifically is intelligent central air-conditioning closed-loop control system.
Background technology
Traditional central air conditioner system adopts proportional valve controller to regulate the aperture of heat exchanger water inlet valve automatically according to the temperature comparative result usually, promptly reduce the flowing velocity of fluid (chilled water) in heat exchanger with the resistance that increases water inlet, this causes most of fluid dynamic energy to be wasted, the kinetic energy that the is wasted refrigerating water pump consumed power of central air-conditioning is exactly provided, this obviously can not satisfy the energy-saving and emission-reduction strategy requirement.
At above deficiency, central air conditioner system is improved, the aperture of inlet valve is fixed, adopt frequency converter open loop control to the rotation speed of fan dynamic adjustments, can regulate the blower fan power output according to the demand of scene load, avoid blower motor to be in the state of full speed running always, reduced air conditioning energy consumption, the mechanical rotation that reduces blower fan is is again widely partly worn and torn.
But blower fan has the following disadvantages by frequency converter open loop control:
(1) adopt the frequency output of manual adjustments frequency converter, can not be according to season, round the clock, the variation of temperature in real time regulates frequency converter frequency automatically, do not reach the purpose of accurate temperature-controlling energy-saving.
When (2) many air-conditionings adopt the redundancy running mode, can not throw, cut air-conditioning quantity according to computer room temperature, active and standby air-conditioning can't be realized orderly, timing automatic switching.
(3) after safeguarding trial run generator or mains failure switchover operation generator, blower fan can not in time start automatically, and there is the overtemperature risk in computer room temperature, influences the security of operation of equipment.
(4) can not be to apparatus remote monitoring in real time and operation.
The utility model content
The utility model provides a kind of intelligent central air-conditioning closed-loop control system for remedying the deficiencies in the prior art, and blower fan is carried out the intelligence centralized management, ensures that whole central air conditioner system adjusting rationalizes.
For achieving the above object, the utility model has adopted following technical scheme:
Intelligence central air-conditioning closed-loop control system comprises PC work station, PLC controller, frequency converter, air-conditioning draught fan, temperature sensor, and the PC work station is connected with the PLC controller; Wherein air-conditioning draught fan is provided with one to a plurality of, frequency converter and temperature sensor are equipped with air-conditioning draught fan coupling one to a plurality of, each air-conditioning draught fan is connected with the PLC controller by a frequency converter respectively, and each temperature sensor is connected with the PLC controller with a frequency converter respectively.
In the technique scheme, the output relay of also connecting between PLC controller and the frequency converter.
In the technique scheme, the transmitter of also connecting between temperature sensor and the frequency converter.
Operation principle of the present utility model is as follows:
By the PC work station PC controller is programmed according to actual needs, air-conditioning draught fan free arrangement, combination are controlled, by the FWD-COM terminal of output relay access frequency converter, realize automatic startup, the dead electricity of blower fan got the timing operation control of the startup automatically of electric back, the by turns automatic and new blower fan of active and standby unit.In order accurately to reflect indoor actual temperature, in indoor appropriate location a plurality of temperature sensors are set, variations in temperature is converted to the voltage signal of 0-10V with temperature sensor and the reference signal of transmitter is carried out differential relatively amplification, produces the 4-20mA signal.Deliver to control voltage input end of frequency converter, frequency converter is carried out the PID closed-loop control; Parameter testing and control coefrficient correction by to frequency converter make indoor temperature consistent with the temperature of setting, and temperature fluctuation range is less.Because the characteristics of blower fan and air conditioner motor itself, when it's the service life that can reduce operating efficiency greatly when hanging down and can influence air conditioner motor is past air conditioner motor speed, occur for stopping above situation, frequency converter is provided with the minimum operation lower-frequency limit, make frequency converter carry out PID can not unconfined reduction air conditioner motor speed when regulating, operation of air conditioner is carried out ladder control, when having reached the upper limit, the air conditioner motor running frequency of moving still can not satisfy refrigeration demand, when satisfying the condition that increases operation of air conditioner quantity through sequential operation, the PLC controller will send enabling signal in order to frequency converter, increase the quantity of operation air-conditioning draught fan, reach design temperature up to computer room temperature, and after computer room temperature descended, the PLC controller can gradually reduce the quantity of operation air-conditioning draught fan, until the best air-conditioning quantity that can satisfy the machine room refrigeration.Characteristics according to the central air-conditioning air cooling system, air quantity is regulated air themperature influence in the room bigger to the influence of air themperature than water valve regulating pondage, regulate as homophony so adopt with air quantity, water valve is regulated the control mode of transferring as auxilliary, it is invalid that the PID of water valve is adjusted in when carrying out the adjusting of frequency conversion air quantity,, will guarantee the rationalization that the whole wind cabinet system is regulated like this when thereby frequency converter frequency output reaches the operation power connection of the PID adjuster of the deferred action of the output relay of frequency converter generation in limited time control water valve down.
The PC work station that is connected with the PLC controller connects the internet by router, can carry out remote monitoring and control to air-conditioning, improves the intellectuality control level of equipment greatly, and is significant to unmanned control especially.
Compare with prior art, the novel beneficial effect of this use is:
Blower fan is carried out the intelligence centralized management, carry out the unit team control, improved temperature control precision; After electric power system is switched, start air-conditioning wind cabinet-type air conditioner timely automatically, shortened downtime, avoid temperature fluctuation; Redundant standby fan follow procedure uses by turns, makes the unit component wear average, prevents that stand-by equipment from getting rusty, and prolongs the service life of unit; New blower fan carried out regularly start, stop, IAQ is improved; Can also supervise blower fan by remote live, ensure the air-conditioning safe operation.
Description of drawings
Fig. 1 is a structural model schematic diagram of the present utility model.
Fig. 2 is the theory diagram of closed-loop control of the present utility model.
The specific embodiment
Below in conjunction with specification drawings and specific embodiments the utility model is described further, but the scope that the utility model is protected is not limited thereto.
As depicted in figs. 1 and 2, intelligent central air-conditioning closed-loop control system comprises PC work station, PLC controller, frequency converter, air-conditioning draught fan, temperature sensor, and the PC work station is connected with the PLC controller; Wherein air-conditioning draught fan is provided with one to a plurality of, frequency converter and temperature sensor are equipped with air-conditioning draught fan coupling one to a plurality of, each air-conditioning draught fan is connected with the PLC controller by a frequency converter respectively, and each temperature sensor is connected with the PLC controller with a frequency converter respectively.
In the technique scheme, the output relay of also connecting between PLC controller and the frequency converter.
In the technique scheme, the transmitter of also connecting between temperature sensor and the frequency converter.
By the PC work station PC controller is programmed according to actual needs, air-conditioning draught fan free arrangement, combination are controlled, by the FWD-COM terminal of output relay access frequency converter, realize automatic startup, the dead electricity of blower fan got the timing operation control of the startup automatically of electric back, the by turns automatic and new blower fan of active and standby unit.In order accurately to reflect indoor actual temperature, in indoor appropriate location a plurality of temperature sensors are set, variations in temperature is converted to the voltage signal of 0-10V with temperature sensor and the reference signal of transmitter is carried out differential relatively amplification, produces the 4-20mA signal.Deliver to control voltage input end of frequency converter, frequency converter is carried out the PID closed-loop control; Parameter testing and control coefrficient correction by to frequency converter make indoor temperature consistent with the temperature of setting, and temperature fluctuation range is less.Because the characteristics of blower fan and air conditioner motor itself, when it's the service life that can reduce operating efficiency greatly when hanging down and can influence air conditioner motor is past the air conditioner motor motor speed, occur for stopping above situation, frequency converter is provided with the minimum operation lower-frequency limit, make frequency converter carry out PID can not unconfined reduction air conditioner motor speed when regulating, operation of air conditioner is carried out ladder control, when having reached the upper limit, the air conditioner motor running frequency of moving still can not satisfy refrigeration demand, when satisfying the condition that increases operation of air conditioner quantity through sequential operation, the PLC controller will send enabling signal in order to frequency converter, increase the quantity of operation air-conditioning draught fan, reach design temperature up to computer room temperature, and after computer room temperature descends, the PLC controller can gradually reduce the quantity of operation air-conditioning draught fan, until the best air-conditioning quantity that can satisfy the machine room refrigeration.Characteristics according to the central air-conditioning air cooling system, air quantity is regulated air themperature influence in the room bigger to the influence of air themperature than water valve regulating pondage, regulate as homophony so adopt with air quantity, water valve is regulated the control mode of transferring as auxilliary, it is invalid that the PID of water valve is adjusted in when carrying out the adjusting of frequency conversion air quantity,, will guarantee the rationalization that the whole wind cabinet system is regulated like this when thereby frequency converter frequency output reaches the operation power connection of the PID adjuster of the deferred action of the output relay of frequency converter generation in limited time control water valve down.
The PC work station that is connected with the PLC controller connects the internet by router, can carry out remote monitoring and control to air-conditioning, improves the intellectuality control level of equipment greatly, and is significant to unmanned control especially.
Claims (4)
1, intelligent central air-conditioning closed-loop control system is characterized in that: comprise PC work station, PLC controller, frequency converter, air-conditioning draught fan, temperature sensor, the PC work station is connected with the PLC controller; Wherein air-conditioning draught fan is provided with one to a plurality of, frequency converter and temperature sensor are equipped with air-conditioning draught fan coupling one to a plurality of, each air-conditioning draught fan is connected with the PLC controller by a frequency converter respectively, and each temperature sensor is connected with the PLC controller with a frequency converter respectively.
2, intelligent central air-conditioning closed-loop control system according to claim 1 is characterized in that: the output relay of also connecting between PLC controller and the frequency converter.
3, intelligent central air-conditioning closed-loop control system according to claim 1 is characterized in that: the transmitter of also connecting between temperature sensor and the frequency converter.
4, according to claim 1 or 2 or 3 described intelligent central air-conditioning closed-loop control systems, it is characterized in that: the PC work station connects the internet by router.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820204079XU CN201302260Y (en) | 2008-11-26 | 2008-11-26 | Intelligent central air conditioner closed loop control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820204079XU CN201302260Y (en) | 2008-11-26 | 2008-11-26 | Intelligent central air conditioner closed loop control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201302260Y true CN201302260Y (en) | 2009-09-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820204079XU Expired - Lifetime CN201302260Y (en) | 2008-11-26 | 2008-11-26 | Intelligent central air conditioner closed loop control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201302260Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102996481A (en) * | 2012-12-18 | 2013-03-27 | 复盛实业(上海)有限公司 | Cooling device and cooling method |
| CN104566815A (en) * | 2014-12-26 | 2015-04-29 | 珠海格力电器股份有限公司 | Remote control system and method for water system of central air conditioner and central air conditioner |
| CN105042804A (en) * | 2015-09-06 | 2015-11-11 | 成都猴子软件有限公司 | Variable-frequency intelligent air conditioning system of building |
| CN109520078A (en) * | 2018-08-31 | 2019-03-26 | 李勤山 | A kind of air-conditioning PC side controller |
-
2008
- 2008-11-26 CN CNU200820204079XU patent/CN201302260Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102996481A (en) * | 2012-12-18 | 2013-03-27 | 复盛实业(上海)有限公司 | Cooling device and cooling method |
| CN102996481B (en) * | 2012-12-18 | 2016-01-20 | 复盛实业(上海)有限公司 | A kind of cooling unit and a kind of cooling means |
| CN104566815A (en) * | 2014-12-26 | 2015-04-29 | 珠海格力电器股份有限公司 | Remote control system and method for water system of central air conditioner and central air conditioner |
| CN105042804A (en) * | 2015-09-06 | 2015-11-11 | 成都猴子软件有限公司 | Variable-frequency intelligent air conditioning system of building |
| CN109520078A (en) * | 2018-08-31 | 2019-03-26 | 李勤山 | A kind of air-conditioning PC side controller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090902 |