CN205227680U - Central air conditioning's controlling means - Google Patents
Central air conditioning's controlling means Download PDFInfo
- Publication number
- CN205227680U CN205227680U CN201521064642.4U CN201521064642U CN205227680U CN 205227680 U CN205227680 U CN 205227680U CN 201521064642 U CN201521064642 U CN 201521064642U CN 205227680 U CN205227680 U CN 205227680U
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- converter
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- central air
- control device
- temperature detecting
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Abstract
The application discloses central air conditioning's controlling means, it can be in real time according to external environment control central air conditioning to the design is simple, the practicality is strong, the operation is reliable and stable. It includes programmable logic controler PLC, temperature detecting element, pressure detecting element, AD converter, DA converter, converter, water pump assembly, and the analog signal of temperature detecting element and the output of pressure detecting element inputs PLC after the AD converter becomes data signal, and the data signal after handling through PLC exports the converter through the DA converter, and the water pump assembly is connected to the converter.
Description
Technical field
The utility model belongs to the technical field of Electromechanical Control, relates to a kind of control device of central air-conditioning particularly.
Background technology
The traditional approach of control device to discharge of central air-conditioning is, adopts baffle plate and valve, can waste much electricity like this.At present, although propose many improved plans, solution real-time control problem all seems unable to do what one wishes.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of control device of central air-conditioning, its can in real time according to external environment control central air-conditioning, and simplicity of design, practical, stable and reliable operation.
The technical scheme solved the problem is: the control device of this central air-conditioning, it comprises programmable logic controller (PLC) PLC, temperature detecting unit, pressure sensing cell, A/D converter, D/A converter, frequency converter, water pump assembly, the analog signal that temperature detecting unit and pressure sensing cell export becomes after data signal through A/D converter and inputs PLC, output to frequency converter by the data signal after PLC process through D/A converter, frequency converter connects water pump assembly.
Control device due to central air-conditioning of the present utility model have employed PLC treatment temperature and pressure signal, obtain real-time actuating signal, again by the speed of service of Frequency Converter Control water pump assembly, so can in real time according to external environment control central air-conditioning, and simplicity of design, practical, stable and reliable operation.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of the control device of central air-conditioning of the present utility model.
Fig. 2 is the temperature difference control principle drawing of the control device of central air-conditioning of the present utility model.
Detailed description of the invention
As shown in Figure 1, the control device of this central air-conditioning, it comprises programmable logic controller (PLC) PLC (in figure PLC main frame), temperature detecting unit (in figure temperature sensor), pressure sensing cell (in figure pressure sensor), A/D converter (in figure A/D module), D/A converter (in figure D/A module), frequency converter, water pump assembly, the analog signal that temperature detecting unit and pressure sensing cell export becomes after data signal through A/D converter and inputs PLC, frequency converter is outputted to through D/A converter by the data signal after PLC process, frequency converter connects water pump assembly.
Control device due to central air-conditioning of the present utility model have employed PLC treatment temperature and pressure signal, obtain real-time actuating signal, again by the speed of service of Frequency Converter Control water pump assembly, so can in real time according to external environment control central air-conditioning, and simplicity of design, practical, stable and reliable operation.Preferably, described PLC is siemens PLC series Programmable logic Controller (PLC), and described frequency converter is Siemens MM420 frequency converter.
Preferably, described A/D converter, D/A converter are respectively ADC0800 module, DAC0800 module.
Preferably, described temperature detecting unit is PT100 temperature sensor, and described pressure sensing cell is TCP pressure sensor.
Preferably, between PLC and D/A converter, be also provided with midget relay, and often the opening or normally closed interlock of correspondence.
Particularly, PLC I/O expansion board interface accesses A/D and D/A modular converter respectively, the analog signal of feeding is converted to data signal through A/D by temperature and pressure sensor, and send into PLC, the input signal of PLC have unit optimum selection signal, operation mode selecting signal, cooling tower and main frame ON/OFF signal, refrigerating water pump and coolant pump rise/stop signal etc.Input signal, through the sequential operation of PLC, sends corresponding actuating signal, through midget relay and accordingly normally closed, normally open contact control the operation of frequency converter and central air conditioner system respectively.The switching value that PLC exports is converted to analog quantity by D/A module, to control raising speed and the reduction of speed of frequency converter, thus realizes the speeds control to water pump and blower fan.
Preferably, between described temperature detecting unit and PLC, proportional-integral derivative controller PID is provided with.As shown in Figure 2, PLC using the actual temperature difference as feedback signal with to compare to fixed difference difference and to control by PID controller, when the actual temperature difference is greater than to fixed difference difference, show that actual semen donors is not enough, need to increase cold, now, PLC performs relevant instruction and output signal controls frequency converter raising output frequency after D/A conversion, to improve the rotating speed of water pump assembly (this example comprises No. 1 and No. 2 water pumps) to increase cold, thus the actual temperature difference is moved closer to fixed difference difference.Can not meet the demands iff startup No. 1 water pump, also need startup No. 2 pumps to put into operation.In like manner, when the actual temperature difference is less than set-point, illustrate that actual semen donors is unnecessary, semen donors need be reduced, PLC performs instruction and output signal controls frequency converter reduction output frequency after D/A conversion, reduce cold with the rotating speed reducing water pump assembly, thus the actual temperature difference is moved closer to fixed difference difference.If No. 2 pump frequency are reduced to lower frequency limit and still can not meet the demands, No. 2 water pumps can be made out of service, No. 1 water pump continues to run.
The above; it is only preferred embodiment of the present utility model; not any pro forma restriction is done to the utility model; every above embodiment is done according to technical spirit of the present utility model any simple modification, equivalent variations and modification, all still belong to the protection domain of technical solutions of the utility model.
Claims (6)
1. the control device of a central air-conditioning, it is characterized in that: it comprises programmable logic controller (PLC) PLC, temperature detecting unit, pressure sensing cell, A/D converter, D/A converter, frequency converter, water pump assembly, the analog signal that temperature detecting unit and pressure sensing cell export becomes after data signal through A/D converter and inputs PLC, output to frequency converter by the data signal after PLC process through D/A converter, frequency converter connects water pump assembly.
2. the control device of central air-conditioning according to claim 1, is characterized in that: described PLC is siemens PLC series Programmable logic Controller (PLC), and described frequency converter is Siemens MM420 frequency converter.
3. the control device of central air-conditioning according to claim 2, is characterized in that: described A/D converter, D/A converter are respectively ADC0800 module, DAC0800 module.
4. the control device of central air-conditioning according to claim 3, is characterized in that: described temperature detecting unit is PT100 temperature sensor, and described pressure sensing cell is TCP pressure sensor.
5. the control device of central air-conditioning according to claim 1, is characterized in that: between PLC and D/A converter, be also provided with midget relay, and often the opening or normally closed interlock of correspondence.
6. the control device of the central air-conditioning according to any one of claim 1-5, is characterized in that: between described temperature detecting unit and PLC, be provided with proportional-integral derivative controller PID.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521064642.4U CN205227680U (en) | 2015-12-18 | 2015-12-18 | Central air conditioning's controlling means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521064642.4U CN205227680U (en) | 2015-12-18 | 2015-12-18 | Central air conditioning's controlling means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205227680U true CN205227680U (en) | 2016-05-11 |
Family
ID=55902739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521064642.4U Expired - Fee Related CN205227680U (en) | 2015-12-18 | 2015-12-18 | Central air conditioning's controlling means |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205227680U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109737797A (en) * | 2018-12-11 | 2019-05-10 | 彩虹（合肥）液晶玻璃有限公司 | Heat Exchanger Control System and method |
-
2015
- 2015-12-18 CN CN201521064642.4U patent/CN205227680U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109737797A (en) * | 2018-12-11 | 2019-05-10 | 彩虹（合肥）液晶玻璃有限公司 | Heat Exchanger Control System and method |
| CN109737797B (en) * | 2018-12-11 | 2020-06-19 | 彩虹（合肥）液晶玻璃有限公司 | Heat exchanger control system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20181218 |