CN104406273A - Protective circuit of central air-conditioning cooling fan - Google Patents
Protective circuit of central air-conditioning cooling fan Download PDFInfo
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- CN104406273A CN104406273A CN201410815349.0A CN201410815349A CN104406273A CN 104406273 A CN104406273 A CN 104406273A CN 201410815349 A CN201410815349 A CN 201410815349A CN 104406273 A CN104406273 A CN 104406273A
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Electric Motors In General (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a protective circuit of a central air-conditioning cooling fan. A current foldback circuit and a default phase protective circuit are designed so as to achieve the protection function for the fan. Because the fan is greatly affected by the external environment in the operation process, a protective time regulating function is designed, and time delay protection can be carried out according to the application situation of the field; each item of the power of the fan in the field is not completely the same, so that a protection limiting function is designed; meanwhile, the protective circuit can be directly connected with a singlechip so as to realize remote monitoring. The protective circuit has the advantages that the reasonable design is adopted, the protection functions are complete, the anti-interference capability is relatively high, the outer peripheral devices are few, the implementation cost is simple, and the protective circuit has the field configuration and regulation functions.
Description
Technical field
The present invention relates to central air-conditioning control field, specifically a kind of central air-conditioning cooling blower protection circuit.
Background technology
In central air-conditioning water-cooled unit, recirculated cooling water is used to be one of the most frequently used method.In order to make warmed-up water cooling down again in unit, again recycling, often using cooling tower.The features such as blower fan is the critical component of mechanical-draft cooling tower, usually all adopts outdoor vertical Special motor for cooling tower, has efficiency high, power consumptive province, and water resistance is good.Water is when cooling tower drips, and cooling blower makes it to contact more fully with air, transfers heat to surrounding air, water temperature is lowered.Because blower fan is in operating condition for a long time, therefore need Real-Time Monitoring fan condition, improve blower fan maintainability and stability.
Summary of the invention
The invention provides a kind of central air-conditioning cooling blower protection circuit, the operational situation of blower fan can be detected in real time, protect fan safe, work reliably.
The present invention is by the following technical solutions: central air-conditioning cooling blower protection circuit, comprise chip NE556, first pin of chip NE556 connects chip NE556 second pin and the 6th pin by resistance R5, 6th pin of chip NE556 is by electric capacity C2 ground connection, chip NE556 the 3rd pin connects Zener diode D2 negative pole, Zener diode D2 plus earth, chip NE556 first pin connects the mobile terminal of slide rheostat R2 by resistance R4, a stiff end of slide rheostat R2 is by resistance R3 ground connection, another stiff end contact resistance R1 one end of slide rheostat R2, the resistance R1 other end connects diode D1 negative pole and electric capacity C1 one end respectively, electric capacity C1 other end ground connection, diode D1 positive pole connects an output of current transformer, another output head grounding of current transformer, 4th pin of chip NE556, tenth pin is all connected 12V voltage with the 14 pin, 12V voltage is by electric capacity C7 ground connection, resistance R16 mono-termination 12V voltage, the positive pole of resistance R16 other end sending and receiving optical diode LED2, the negative pole of Light-Emitting Diode LED2 connects one end of chip NE556 the 5th pin and slide rheostat R12 respectively, slide rheostat R12 other end connecting resistance R11 one end, another terminating diode of resistance R11 D8 negative pole, diode D8 positive pole connects Zener diode D7 negative pole respectively, chip NE556 the 8th pin, chip NE556 the 12 pin, Zener diode D7 plus earth, diode D3 positive pole connects an output of voltage transformer pt 1, diode D3 negative pole connects electric capacity C3 one end and resistance R6 one end respectively, the electric capacity C3 other end connects another output of voltage transformer pt 1 and triode Q1 emitter stage respectively, another termination triode of resistance R6 Q1 base stage, triode Q1 colelctor electrode connects 12V voltage, triode Q1 emitter stage connects triode Q2 colelctor electrode, triode Q2 base stage connecting resistance R7 one end, the resistance R7 other end connects electric capacity C4 one end and diode D4 negative pole respectively, diode D4 positive pole connects voltage transformer pt 2 one outputs, the electric capacity C4 other end connects another output of voltage transformer pt 2 and triode Q2 emitter stage respectively, triode Q2 emitter stage connects triode Q3 colelctor electrode, triode Q3 base stage connecting resistance R8 one end, another terminating diode of resistance R8 D5 negative pole, diode D5 positive pole connects voltage transformer pt 3 one outputs, electric capacity C5 mono-terminating diode D5 negative pole, the electric capacity C5 other end connects another output of voltage transformer RT3 and triode Q3 emitter stage respectively, triode Q3 emitter stage is by resistance R10 ground connection, triode Q3 emitter stage is contact resistance R9 one end and diode D6 negative pole respectively, the resistance R9 other end connects Light-Emitting Diode LED1 negative pole, Light-Emitting Diode LED1 positive pole connects 12V voltage, diode D6 positive pole connects electric capacity C6 one end and chip NE556 the 8th pin respectively, another termination 12V voltage of electric capacity C6, diode D6 puts into negative pole and connects single-chip microcomputer by resistance R13, 5th pin of chip NE556 connects single-chip microcomputer by resistance R15, chip NE556 the 9th pin connects single-chip microcomputer by resistance R14.
The invention has the beneficial effects as follows: the present invention mainly checks the overcurrent of blower fan; open-phase protection; realize blower fan defencive function; because blower fan is in operation process; comparatively large by ectocine, devise guard time regulatory function, delay protection can be carried out according to the applicable cases at scene; the on-the-spot each project of power of fan is not quite similar, and devises protection limitation function.Can be connected with single-chip microcomputer simultaneously, realize remote monitoring, advantage, adopt and reasonably design, defencive function is complete, antijamming capability is higher.Peripheral components is less, realizes cost simple, possesses situ configuration regulatory function.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Detailed description of the invention
Central air-conditioning cooling blower protection circuit as shown in Figure 1, comprise chip NE556, first pin of chip NE556 connects chip NE556 second pin and the 6th pin by resistance R5, 6th pin of chip NE556 is by electric capacity C2 ground connection, chip NE556 the 3rd pin connects Zener diode D2 negative pole, Zener diode D2 plus earth, chip NE556 first pin connects the mobile terminal of slide rheostat R2 by resistance R4, a stiff end of slide rheostat R2 is by resistance R3 ground connection, another stiff end contact resistance R1 one end of slide rheostat R2, the resistance R1 other end connects diode D1 negative pole and electric capacity C1 one end respectively, electric capacity C1 other end ground connection, diode D1 positive pole connects an output of current transformer, another output head grounding of current transformer, 4th pin of chip NE556, tenth pin is all connected 12V voltage with the 14 pin, 12V voltage is by electric capacity C7 ground connection, resistance R16 mono-termination 12V voltage, the positive pole of resistance R16 other end sending and receiving optical diode LED2, the negative pole of Light-Emitting Diode LED2 connects one end of chip NE556 the 5th pin and slide rheostat R12 respectively, slide rheostat R12 other end connecting resistance R11 one end, another terminating diode of resistance R11 D8 negative pole, diode D8 positive pole connects Zener diode D7 negative pole respectively, chip NE556 the 8th pin, chip NE556 the 12 pin, Zener diode D7 plus earth, diode D3 positive pole connects an output of voltage transformer pt 1, diode D3 negative pole connects electric capacity C3 one end and resistance R6 one end respectively, the electric capacity C3 other end connects another output of voltage transformer pt 1 and triode Q1 emitter stage respectively, another termination triode of resistance R6 Q1 base stage, triode Q1 colelctor electrode connects 12V voltage, triode Q1 emitter stage connects triode Q2 colelctor electrode, triode Q2 base stage connecting resistance R7 one end, the resistance R7 other end connects electric capacity C4 one end and diode D4 negative pole respectively, diode D4 positive pole connects voltage transformer pt 2 one outputs, the electric capacity C4 other end connects another output of voltage transformer pt 2 and triode Q2 emitter stage respectively, triode Q2 emitter stage connects triode Q3 colelctor electrode, triode Q3 base stage connecting resistance R8 one end, another terminating diode of resistance R8 D5 negative pole, diode D5 positive pole connects voltage transformer pt 3 one outputs, electric capacity C5 mono-terminating diode D5 negative pole, the electric capacity C5 other end connects another output of voltage transformer RT3 and triode Q3 emitter stage respectively, triode Q3 emitter stage is by resistance R10 ground connection, triode Q3 emitter stage is contact resistance R9 one end and diode D6 negative pole respectively, the resistance R9 other end connects Light-Emitting Diode LED1 negative pole, Light-Emitting Diode LED1 positive pole connects 12V voltage, diode D6 positive pole connects electric capacity C6 one end and chip NE556 the 8th pin respectively, another termination 12V voltage of electric capacity C6, diode D6 puts into negative pole and connects single-chip microcomputer by resistance R13, 5th pin of chip NE556 connects single-chip microcomputer by resistance R15, chip NE556 the 9th pin connects single-chip microcomputer by resistance R14.
Blower fan protection circuit mainly completes to be protected blower fan of cooling tower; the overcurrent of main inspection blower fan; open-phase protection; realize blower fan defencive function, because blower fan is in operation process, larger by ectocine; devise guard time regulatory function; can carry out delay protection according to the applicable cases at scene, the on-the-spot each project of power of fan is not quite similar, and devises protection limitation function.Can be connected with single-chip microcomputer simultaneously, realize remote monitoring, advantage, adopt and reasonably design, defencive function is complete, antijamming capability is higher.Peripheral components is less, realizes cost simple, possesses situ configuration regulatory function.
Except structure of the present invention, all the other are prior art.
The above is the preferred embodiment of the present invention, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also regarded as protection scope of the present invention.
Claims (1)
1. central air-conditioning cooling blower protection circuit, it is characterized in that, comprise chip NE556, first pin of chip NE556 connects chip NE556 second pin and the 6th pin by resistance R5, 6th pin of chip NE556 is by electric capacity C2 ground connection, chip NE556 the 3rd pin connects Zener diode D2 negative pole, Zener diode D2 plus earth, chip NE556 first pin connects the mobile terminal of slide rheostat R2 by resistance R4, a stiff end of slide rheostat R2 is by resistance R3 ground connection, another stiff end contact resistance R1 one end of slide rheostat R2, the resistance R1 other end connects diode D1 negative pole and electric capacity C1 one end respectively, electric capacity C1 other end ground connection, diode D1 positive pole connects an output of current transformer, another output head grounding of current transformer, 4th pin of chip NE556, tenth pin is all connected 12V voltage with the 14 pin, 12V voltage is by electric capacity C7 ground connection, resistance R16 mono-termination 12V voltage, the positive pole of resistance R16 other end sending and receiving optical diode LED2, the negative pole of Light-Emitting Diode LED2 connects one end of chip NE556 the 5th pin and slide rheostat R12 respectively, slide rheostat R12 other end connecting resistance R11 one end, another terminating diode of resistance R11 D8 negative pole, diode D8 positive pole connects Zener diode D7 negative pole respectively, chip NE556 the 8th pin, chip NE556 the 12 pin, Zener diode D7 plus earth, diode D3 positive pole connects an output of voltage transformer pt 1, diode D3 negative pole connects electric capacity C3 one end and resistance R6 one end respectively, the electric capacity C3 other end connects another output of voltage transformer pt 1 and triode Q1 emitter stage respectively, another termination triode of resistance R6 Q1 base stage, triode Q1 colelctor electrode connects 12V voltage, triode Q1 emitter stage connects triode Q2 colelctor electrode, triode Q2 base stage connecting resistance R7 one end, the resistance R7 other end connects electric capacity C4 one end and diode D4 negative pole respectively, diode D4 positive pole connects voltage transformer pt 2 one outputs, the electric capacity C4 other end connects another output of voltage transformer pt 2 and triode Q2 emitter stage respectively, triode Q2 emitter stage connects triode Q3 colelctor electrode, triode Q3 base stage connecting resistance R8 one end, another terminating diode of resistance R8 D5 negative pole, diode D5 positive pole connects voltage transformer pt 3 one outputs, electric capacity C5 mono-terminating diode D5 negative pole, the electric capacity C5 other end connects another output of voltage transformer RT3 and triode Q3 emitter stage respectively, triode Q3 emitter stage is by resistance R10 ground connection, triode Q3 emitter stage is contact resistance R9 one end and diode D6 negative pole respectively, the resistance R9 other end connects Light-Emitting Diode LED1 negative pole, Light-Emitting Diode LED1 positive pole connects 12V voltage, diode D6 positive pole connects electric capacity C6 one end and chip NE556 the 8th pin respectively, another termination 12V voltage of electric capacity C6, diode D6 puts into negative pole and connects single-chip microcomputer by resistance R13, 5th pin of chip NE556 connects single-chip microcomputer by resistance R15, chip NE556 the 9th pin connects single-chip microcomputer by resistance R14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410815349.0A CN104406273B (en) | 2014-12-25 | 2014-12-25 | Protective circuit of central air-conditioning cooling fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410815349.0A CN104406273B (en) | 2014-12-25 | 2014-12-25 | Protective circuit of central air-conditioning cooling fan |
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| CN104406273A true CN104406273A (en) | 2015-03-11 |
| CN104406273B CN104406273B (en) | 2017-02-22 |
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| CN201410815349.0A Active CN104406273B (en) | 2014-12-25 | 2014-12-25 | Protective circuit of central air-conditioning cooling fan |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100365B (en) * | 2016-06-30 | 2018-06-22 | 潍坊市跃龙橡胶有限公司 | A kind of large tyre-forming machine is used, under-voltage protecting circuit |
| CN114370415A (en) * | 2020-10-15 | 2022-04-19 | 神讯电脑(昆山)有限公司 | System and method for detecting fan function in voltage division manner |
Citations (6)
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|---|---|---|---|---|
| CN2154430Y (en) * | 1993-03-12 | 1994-01-26 | 宋海珠 | Time protector for window air conditioner of household |
| JPH09203571A (en) * | 1996-01-26 | 1997-08-05 | Mitsubishi Heavy Ind Ltd | Power source open-phase protecting apparatus for refrigerator |
| CN101476766A (en) * | 2008-10-14 | 2009-07-08 | 徐定枢 | Multifunctional control circuit assembly of environment-friendly air conditioner |
| JP2013029294A (en) * | 2011-07-29 | 2013-02-07 | Daikin Industries Ltd | Refrigerating device for container |
| CN203482119U (en) * | 2013-08-29 | 2014-03-12 | 湖南新龙矿业有限责任公司 | Mine blower fan control box |
| CN204478385U (en) * | 2014-12-25 | 2015-07-15 | 李钢 | Central air-conditioning cooling blower protection circuit |
-
2014
- 2014-12-25 CN CN201410815349.0A patent/CN104406273B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2154430Y (en) * | 1993-03-12 | 1994-01-26 | 宋海珠 | Time protector for window air conditioner of household |
| JPH09203571A (en) * | 1996-01-26 | 1997-08-05 | Mitsubishi Heavy Ind Ltd | Power source open-phase protecting apparatus for refrigerator |
| CN101476766A (en) * | 2008-10-14 | 2009-07-08 | 徐定枢 | Multifunctional control circuit assembly of environment-friendly air conditioner |
| JP2013029294A (en) * | 2011-07-29 | 2013-02-07 | Daikin Industries Ltd | Refrigerating device for container |
| CN203482119U (en) * | 2013-08-29 | 2014-03-12 | 湖南新龙矿业有限责任公司 | Mine blower fan control box |
| CN204478385U (en) * | 2014-12-25 | 2015-07-15 | 李钢 | Central air-conditioning cooling blower protection circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100365B (en) * | 2016-06-30 | 2018-06-22 | 潍坊市跃龙橡胶有限公司 | A kind of large tyre-forming machine is used, under-voltage protecting circuit |
| CN114370415A (en) * | 2020-10-15 | 2022-04-19 | 神讯电脑(昆山)有限公司 | System and method for detecting fan function in voltage division manner |
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| CN104406273B (en) | 2017-02-22 |
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Effective date of registration: 20170405 Address after: 250021 Ji'nan, Central District, Shandong City Road, the southern part of the shop No. 18 Patentee after: Shandong Jinzhou Kerui Energy Technology Co. Ltd. Address before: 250024 Ji'nan City, Central District, Shandong sunshine new road, No. 69 Patentee before: Li Gang |