CN106766018A - A kind of laboratory supply and exhaust control system - Google Patents
A kind of laboratory supply and exhaust control system Download PDFInfo
- Publication number
- CN106766018A CN106766018A CN201710158537.4A CN201710158537A CN106766018A CN 106766018 A CN106766018 A CN 106766018A CN 201710158537 A CN201710158537 A CN 201710158537A CN 106766018 A CN106766018 A CN 106766018A
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- China
- Prior art keywords
- air
- supply
- power
- electrical source
- exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
-
- 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
-
- 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- 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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
- F24F11/58—Remote control using Internet communication
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Fluid Mechanics (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention discloses a kind of laboratory supply and exhaust control system, including energy supply control module and air blowing control module, air draft control module, wherein described air blowing control module includes the first blowing unit and the second blowing unit, and the air draft control module includes the first air exhaust units and the second air exhaust units；The energy supply control module includes electrical source of power, electrical source of power control button, electrical source of power controller and electrical source of power three-phase indicator lamp, wherein described electrical source of power uses three-phase five-wire mode, the electrical source of power three-phase indicator lamp is separately positioned between the neutral conductor and a corresponding phase line, and the electrical source of power control button, electrical source of power controller are arranged between the phase line of electrical source of power and zero line；First blowing unit, the second blowing unit, the first air exhaust units and the second air exhaust units are electrically connected with the energy supply control module.The present invention can effectively meet requirement of the laboratory to environment temperature.
Description
Technical field
The present invention relates to supply and exhaust control field, a kind of laboratory supply and exhaust control system is particularly related to.
Background technology
In the mechanical experiment room of colleges and universities, the heat radiation produced in experimentation due to devices such as engines to experiment
Room, raises the environment temperature in laboratory, and the control unit such as ECU is more sensitive to environment temperature, additionally, its in laboratory
The general ideal operation environment temperature of ECU of its oil, water, electricity, gas etc. is 25 DEG C or so, and normal work is will be unable to more than 75 DEG C
Make.But in the prior art, not effective technical scheme goes to change this present situation.
Therefore, the present inventor needs a kind of new technology of design badly to improve its problem.
The content of the invention
The present invention is intended to provide a kind of laboratory supply and exhaust control system, it can effectively meet laboratory to environment temperature
Requirement.
In order to solve the above technical problems, the technical scheme is that：
A kind of laboratory supply and exhaust control system, including：Energy supply control module and air blowing control module, air draft control mould
Block, wherein the air blowing control module includes the first blowing unit and the second blowing unit, the air draft control module includes the
One air exhaust units and the second air exhaust units；The energy supply control module includes electrical source of power, electrical source of power control button, power electric
Source controller and electrical source of power three-phase indicator lamp, wherein the electrical source of power uses three-phase five-wire mode, the electrical source of power three-phase
Indicator lamp is separately positioned between the neutral conductor and a corresponding phase line, the electrical source of power control button, electrical source of power control
Device processed is arranged between the phase line of electrical source of power and zero line；First blowing unit, the second blowing unit, the first air exhaust units
Electrically connected with the energy supply control module with the second air exhaust units.
Preferably, first blowing unit and/or second blowing unit include that air-supply frequency converter, air blowing control are pressed
Button, air-supply A.C. contactor, air-supply indicator lamp, air supply motor, wherein the air blowing control button is arranged on the power supply
Between module and the air-supply A.C. contactor, the air-supply frequency converter is connected with the air supply motor and controls it to operate.
Preferably, first air exhaust units and/or second air exhaust units include that air draft frequency converter, air draft control are pressed
Button, air draft A.C. contactor, air draft indicator lamp, motor exhaust, wherein the air draft control button is arranged on the power supply
Between module and the air draft A.C. contactor, the air draft frequency converter is connected with the motor exhaust and controls it to operate.
Preferably, the air-supply frequency converter and/or the air draft frequency converter are Ai Mosheng frequency converters.
Preferably, the air supply motor and/or the motor exhaust are triphase AC variable frequency speed-regulating asynchronous motor.
Preferably, the air-supply A.C. contactor and/or the air draft A.C. contactor are Siemens Alternating contactor.
Preferably, the electrical source of power control button, the air blowing control button and the air draft control button are holding
Type shift knob.
Preferably, the electrical source of power three-phase indicator lamp, the air-supply indicator lamp and the air draft indicator lamp are
The LED of AC220V.
Preferably, the electrical source of power is AC380V electrical source of power.
Using above-mentioned technical proposal, the present invention at least includes following beneficial effect：
Supply and exhaust control system in laboratory of the present invention, using double VFC, i.e. air supply motor and exhausting motor
All independent VFC, traditional air supplying and exhausting system is generally adopted by determining frequency motor, and this allows for air quantity and pressure difference turns into definite value,
Requirement complicated and changeable cannot be met.Double frequency-changing control systems can not only control pressure difference, can also change with the change in season
The size of variable air rate, realizes the effect of energy-conservation under conditions of laboratory ambient temperature is met.
Brief description of the drawings
Fig. 1 is the schematic diagram of energy supply control module of the present invention；
Fig. 2 is the schematic diagram of the first blowing unit of the present invention；
Fig. 3 is the schematic diagram of the second blowing unit of the present invention；
Fig. 4 is the schematic diagram of the first air exhaust units of the present invention；
Fig. 5 is the schematic diagram of the second air exhaust units of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As shown in Figures 1 to 5, to meet a kind of laboratory supply and exhaust control system of the invention, including：Power supply mould
Block and air blowing control module, air draft control module, wherein the air blowing control module includes the first blowing unit and the second air-supply
Unit, the air draft control module includes the first air exhaust units and the second air exhaust units；The energy supply control module includes power
Power supply, electrical source of power control button, electrical source of power controller and electrical source of power three-phase indicator lamp, wherein the electrical source of power is used
Three-phase five-wire mode, the electrical source of power three-phase indicator lamp is separately positioned between the neutral conductor and a corresponding phase line, described
Electrical source of power control button, electrical source of power controller are arranged between the phase line of electrical source of power and zero line；First air-supply is single
Unit, the second blowing unit, the first air exhaust units and the second air exhaust units are electrically connected with the energy supply control module.
Preferably, first blowing unit and/or second blowing unit include that air-supply frequency converter, air blowing control are pressed
Button, air-supply A.C. contactor, air-supply indicator lamp, air supply motor, wherein the air blowing control button is arranged on the power supply
Between module and the air-supply A.C. contactor, the air-supply frequency converter is connected with the air supply motor and controls it to operate.
Preferably, first air exhaust units and/or second air exhaust units include that air draft frequency converter, air draft control are pressed
Button, air draft A.C. contactor, air draft indicator lamp, motor exhaust, wherein the air draft control button is arranged on the power supply
Between module and the air draft A.C. contactor, the air draft frequency converter is connected with the motor exhaust and controls it to operate.
Preferably, the air-supply frequency converter and/or the air draft frequency converter are Ai Mosheng frequency converters.
Preferably, the air supply motor and/or the motor exhaust are triphase AC variable frequency speed-regulating asynchronous motor.
Preferably, the air-supply A.C. contactor and/or the air draft A.C. contactor are Siemens Alternating contactor.
Preferably, the electrical source of power control button, the air blowing control button and the air draft control button are holding
Type shift knob.
Preferably, the electrical source of power three-phase indicator lamp, the air-supply indicator lamp and the air draft indicator lamp are
The LED of AC220V.
Preferably, the electrical source of power is AC380V electrical source of power.
Laboratory air supplying and exhausting system is functionally divided into three macroplates, is respectively：Power control system, air blowing control system
System, exhaust control system.Wherein, air supply control system and exhaust control system provide air quantity, air quantity by two motors respectively
, by Frequency Converter Control, two motors of supply air system are by a Frequency Converter Control for size；Two motors of exhaust system are by a frequency conversion
Device is controlled.Air supplying and exhausting system concrete operations and principle are as described below：
1st, air supplying and exhausting system electrical source of power is AC380V, is by five cables of L1, L2, L3, N, PE using three-phase five-wire mode
Composition, wherein, voltage is respectively AC380V between L1, L2, L3, and voltage is 220V between L1, L2, L3 and N, and PE is ground connection
Line.When button SB0 is pressed, A.C. contactor KM0 coils obtain electric, now the adhesive of A.C. contactor KM0 contacts, indicator lamp LA,
LB, LC obtain electric bright.(SB0 is electrical source of power control button, and KM0 is electrical source of power controller, and LA, LB, LC are electrical source of power three-phase
Indicator lamp)
2nd, after LA, LB, LC indicator lamp are bright, SB1 buttons are pressed, A.C. contactor KM1 coils obtain electric, A.C. contactor
The adhesive of KM1 contacts, now, frequency converter UF1 and motor M1 obtain electric, and L11 is bright for its indicator lamp.Rotary frequency convertors UF1 frequency knobs, i.e.,
Rotation speed of fan can be changed, so as to adjust air-supply air quantity size
3rd, after LA, LB, LC indicator lamp are bright, SB2 buttons are pressed, A.C. contactor KM2 coils obtain electric, A.C. contactor
The adhesive of KM2 contacts, now, frequency converter UF1 and motor M2 obtain electric, and L12 is bright for its indicator lamp.Rotary frequency convertors UF1 frequency knobs, i.e.,
Rotation speed of fan can be changed, so as to adjust air-supply air quantity size.
4th, after LA, LB, LC indicator lamp are bright, SB3 buttons are pressed, A.C. contactor KM3 coils obtain electric, A.C. contactor
The adhesive of KM3 contacts, now, frequency converter UF2 and motor M3 obtain electric, and L13 is bright for its indicator lamp.Rotary frequency convertors UF2 frequency knobs, i.e.,
Rotation speed of fan can be changed, so as to adjust air draft air force.
5th, after LA, LB, LC indicator lamp are bright, SB4 buttons are pressed, A.C. contactor KM4 coils obtain electric, A.C. contactor
The adhesive of KM4 contacts, now, frequency converter UF2 and motor M4 obtain electric, and L14 is bright for its indicator lamp.Rotary frequency convertors UF2 frequency knobs, i.e.,
Rotation speed of fan can be changed, so as to adjust air draft air force.
The present embodiment is using double VFC, i.e. air supply motors and all independent VFC of exhausting motor, traditional supply and exhaust
System is generally adopted by determining frequency motor, and this allows for air quantity and pressure difference turns into definite value, it is impossible to meet requirement complicated and changeable.It is double
Frequency-changing control system can not only control pressure difference, and the size of air quantity can also be changed with the change in season, meet laboratory
The effect of energy-conservation is realized under conditions of environment temperature.
Below to the present embodiment in each part be specifically described, situation is as follows：
1st, control button SB0, SB1, SB2, SB3, SB4 uses maintenance shift knob.
2nd, indicator lamp LA, LB, LC, L11, L12, L13, L14 is the LED lampets of AC220V, and energization green light, power-off is put out
Go out.
3rd, A.C. contactor KM0 controls electrical source of power power on/off, using Siemens Alternating contactor, model 3TF46
44-0X M0, this A.C. contactor carries arc-chutes, during power on/off can effective arc extinguishing, using operation, more safety can
Lean on.
4th, A.C. contactor KM1 controls frequency converter UF1 and blower fan M1, using Siemens Alternating contactor, model 3TF32
11-0X M0, this A.C. contactor carries arc-chutes, during power on/off can effective arc extinguishing, using operation, more safety can
Lean on.
5th, A.C. contactor KM2 controls frequency converter UF1 and blower fan M2, using Siemens Alternating contactor, model 3TF32
11-0X M0, this A.C. contactor carries arc-chutes, during power on/off can effective arc extinguishing, using operation, more safety can
Lean on.
6th, A.C. contactor KM3 controls frequency converter UF2 and blower fan M3, using Siemens Alternating contactor, model 3TF32
11-0X M0, this A.C. contactor carries arc-chutes, during power on/off can effective arc extinguishing, using operation, more safety can
Lean on.
7th, A.C. contactor KM4 controls frequency converter UF2 and blower fan M4, using Siemens Alternating contactor, model 3TF32
11-0X M0, this A.C. contactor carries arc-chutes, during power on/off can effective arc extinguishing, using operation, more safety can
Lean on.
8th, the rotating speed of frequency converter UF1 control blower fans M1, M2, using Ai Mosheng frequency converters, model EV 2000-4T
0370G/0450P, secondary frequency converter uses magnetic flux vector PWM, speed adjustable range 1:100, starting torque 0.5Hz are 180% volumes
Determine torque.
9th, the rotating speed of frequency converter UF2 control blower fans M3, M4, using Ai Mosheng frequency converters, model EV 2000-4T
0370G/0450P, secondary frequency converter uses magnetic flux vector PWM, speed adjustable range 1:100, starting torque 0.5Hz are 180% volumes
Determine torque.
10th, motor M1 is breeze fan, using Wuxi pioneer's BPY series three phase ac variable frequency speed regulation asynchronous motors, type
Number be BPY 160M1-4, secondary motor in low cruise (5~50Hz) have compared with high start torque, can be 1:Make in the range of 10
Permanent torque runs, and operates steadily, without torque creeping phenomenon；Motor (5~50Hz) in high-speed cruising has overload higher
Ability, it is ensured that motor when different rotating speeds run with good cooling effect, and this motor noise it is low, vibrate small, speed governing model
Enclose wide (15~1500rpm), reliable, easy to maintenance.
11st, motor M2 is breeze fan, using Wuxi pioneer's BPY series three phase ac variable frequency speed regulation asynchronous motors, type
Number be BPY 160M1-4, secondary motor in low cruise (5~50Hz) have compared with high start torque, can be 1:Make in the range of 10
Permanent torque runs, and operates steadily, without torque creeping phenomenon；Motor (5~50Hz) in high-speed cruising has overload higher
Ability, it is ensured that motor when different rotating speeds run with good cooling effect, and this motor noise it is low, vibrate small, speed governing model
Enclose wide (15~1500rpm), reliable, easy to maintenance.
12nd, motor M3, M4 is exhaust fan, is breeze fan, is adjusted using Wuxi pioneer's BPY series three phases AC frequency conversion
Speed asynchronous motor, model BPY 160M1-4, secondary motor (5~50Hz) in low cruise has compared with high start torque, energy
1:Make permanent torque operation in the range of 10, and operate steadily, without torque creeping phenomenon；Motor (5~50Hz) in high-speed cruising
With overload capacity higher, it is ensured that motor when different rotating speeds run with good cooling effect, and this motor noise it is low,
It is the small, speed adjustable range of vibration wide (15~1500rpm), reliable, easy to maintenance.
Exhaust system attachment means noted also in experimentation it is following some：
1st, channel check must be carried out before testing, has checked whether whether phase shortage and circuit connection point are firm.
2nd, check whether supply and exhaust motor positive and inverse is normal.
3rd, after experiment terminates, power supply must be closed.
Because lab space is larger, if only with one group of breeze fan and exhaust fan, probably air quantity does not reach expected effects,
Therefore two groups of breeze fans and exhaust fan are used, and can be opened according to service condition and controlled, two groups of blower fans are independent control, not by that
This control influence.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The scope most wide for causing.
Claims (9)
1. a kind of laboratory supply and exhaust control system, it is characterised in that including：Energy supply control module and air blowing control module, row
Wind control module, wherein the air blowing control module includes the first blowing unit and the second blowing unit, the air draft controls mould
Block includes the first air exhaust units and the second air exhaust units；The energy supply control module includes that electrical source of power, electrical source of power control are pressed
Button, electrical source of power controller and electrical source of power three-phase indicator lamp, wherein the electrical source of power uses three-phase five-wire mode, the power
Power supply three-phase indicator lamp is separately positioned between the neutral conductor and a corresponding phase line, the electrical source of power control button, dynamic
Power power-supply controller of electric is arranged between the phase line of electrical source of power and zero line；First blowing unit, the second blowing unit, first
Air exhaust units and the second air exhaust units are electrically connected with the energy supply control module.
2. supply and exhaust control system in laboratory as claimed in claim 1, it is characterised in that：First blowing unit and/or
Second blowing unit includes air-supply frequency converter, air blowing control button, air-supply A.C. contactor, air-supply indicator lamp, air-supply electricity
Machine, wherein the air blowing control button is arranged between the energy supply control module and the air-supply A.C. contactor, it is described to send
Wind frequency converter is connected with the air supply motor and controls it to operate.
3. supply and exhaust control system in laboratory as claimed in claim 2, it is characterised in that：First air exhaust units and/or
Second air exhaust units include air draft frequency converter, air draft control button, air draft A.C. contactor, air draft indicator lamp, air draft electricity
Machine, wherein the air draft control button is arranged between the energy supply control module and the air draft A.C. contactor, the row
Wind frequency converter is connected with the motor exhaust and controls it to operate.
4. supply and exhaust control system in laboratory as claimed in claim 3, it is characterised in that：Air-supply frequency converter and/or the institute
Air draft frequency converter is stated for Ai Mosheng frequency converters.
5. the laboratory supply and exhaust control system as described in claim 3 or 4, it is characterised in that：The air supply motor and/or institute
Motor exhaust is stated for triphase AC variable frequency speed-regulating asynchronous motor.
6. the laboratory supply and exhaust control system as described in claim 3-5 is any, it is characterised in that：The air-supply ac contactor
Device and/or the air draft A.C. contactor are Siemens Alternating contactor.
7. the laboratory supply and exhaust control system as described in claim 3-6 is any, it is characterised in that：The electrical source of power control
Button, the air blowing control button and the air draft control button are maintenance shift knob.
8. the laboratory supply and exhaust control system as described in claim 3-7 is any, it is characterised in that：The electrical source of power three-phase
Indicator lamp, the air-supply indicator lamp and the air draft indicator lamp are the LED of AC220V.
9. the laboratory supply and exhaust control system as described in claim 1-8 is any, it is characterised in that：The electrical source of power is
AC380V electrical source of power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710158537.4A CN106766018A (en) | 2017-03-17 | 2017-03-17 | A kind of laboratory supply and exhaust control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710158537.4A CN106766018A (en) | 2017-03-17 | 2017-03-17 | A kind of laboratory supply and exhaust control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106766018A true CN106766018A (en) | 2017-05-31 |
Family
ID=58966796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710158537.4A Pending CN106766018A (en) | 2017-03-17 | 2017-03-17 | A kind of laboratory supply and exhaust control system |
Country Status (1)
| Country | Link |
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| CN (1) | CN106766018A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201724330U (en) * | 2010-08-17 | 2011-01-26 | 浙江聚英风机工业有限公司 | Ventilating system for purifying smoke dust of workshop |
| CN102878632A (en) * | 2012-09-18 | 2013-01-16 | 中国人民解放军总后勤部军需装备研究所 | Multifunctional ventilation system of clothes inflaming retarding protection performance test evaluation laboratory |
| CN103982974A (en) * | 2014-04-22 | 2014-08-13 | 天长市华盛科技装饰有限公司 | Cit intelligent ventilation control system |
| CN205036609U (en) * | 2015-08-07 | 2016-02-17 | 上海楚维机电设备有限公司 | Hot fan control circuit |
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-
2017
- 2017-03-17 CN CN201710158537.4A patent/CN106766018A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201724330U (en) * | 2010-08-17 | 2011-01-26 | 浙江聚英风机工业有限公司 | Ventilating system for purifying smoke dust of workshop |
| CN102878632A (en) * | 2012-09-18 | 2013-01-16 | 中国人民解放军总后勤部军需装备研究所 | Multifunctional ventilation system of clothes inflaming retarding protection performance test evaluation laboratory |
| CN103982974A (en) * | 2014-04-22 | 2014-08-13 | 天长市华盛科技装饰有限公司 | Cit intelligent ventilation control system |
| CN205036609U (en) * | 2015-08-07 | 2016-02-17 | 上海楚维机电设备有限公司 | Hot fan control circuit |
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Application publication date: 20170531 |
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