CN207695290U - A kind of wind pressure type fume hood controller - Google Patents
A kind of wind pressure type fume hood controller Download PDFInfo
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- CN207695290U CN207695290U CN201721723491.8U CN201721723491U CN207695290U CN 207695290 U CN207695290 U CN 207695290U CN 201721723491 U CN201721723491 U CN 201721723491U CN 207695290 U CN207695290 U CN 207695290U
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Abstract
The utility model is related to vent cabinet control device technical fields, more particularly to a kind of wind pressure type fume hood controller, include several controllers set on several indoor vent cabinets are tested and for controlling the vent cabinet air draft, the controller is differential pressure type fume hood controller, the exhaust air rate of vent cabinet is passed through RS485 bus transfers to benefit wind controller by the controller, the benefit wind controller is connect with pressure difference control cabinet, and the pressure difference control cabinet is connect with pressure difference touch screen；Pressure sensor and displacement sensor are respectively equipped at the top of the vent cabinet, the side of the vent cabinet is respectively equipped with air velocity transducer and operation panel；The utility model solves the discharge of the toxic gas of chemical laboratory well, air draft wind speed is stablized smooth, it ensure that the safety of experimenter, using adjustment type frequency control, wind turbine utilization rate is set to be promoted, energy consumption is saved, the operation that works for a long time is passed through, it was demonstrated that the feasibility and validity of the exhaust system.
Description
Technical field
The present invention relates to vent cabinet control device technical field more particularly to a kind of wind pressure type fume hood controllers.
Background technology
Currently, vent cabinet is an indispensable component part in Design of ventilation in chemical laboratory, in order to make reality
It tests room staff and does not suck or swallow, chemical substance and organism can cause a disease or that toxicity unknown, laboratory toxic into some
In should have good ventilation, to prevent some steams, gas and particle（Smog, coal smoke, dust and aerosol etc.）Absorption,
Polluter need to use vent cabinet, ventilator cowling or the method for local ventilation to remove.
It is most importantly degassing function in the function of vent cabinet, in chemical laboratory, when real danger operation, which generates, various to be had
Evil gas, foul smell, moisture and inflammable, explosive, corrosive substance prevent the pollution in experiment to protect user safe
Substance is spread to laboratory, and vent cabinet is used near pollution sources, and previous vent cabinet is less using number of units, only particularly detrimental
And used in the experiment of dangerous gas and the big calorimetric of generation, vent cabinet only undertakes the miscellaneous function of experimental bench.In view of improving
Experimental situation, the experiment carried out on experimental bench are gradually transferred in vent cabinet, and this requires to have to be most suitable in vent cabinet
The function of equipment or substance.Since vent cabinet occupies very important position in Biochemical Lab, from improve laboratory environment,
Improve labour health condition, improves working efficiency etc. and consider.The quantity of vent cabinet increases, and the thing followed is ventilation duct
Road, piping, wiring, air draft etc. all become the important topic of lab construction.
In order to meet the use environment of user, vent cabinet must following two major features.
1）Heat-resisting, acid-alkali-corrosive-resisting function：There are placement electric furnace, some experiments to generate harmful gas such as a large amount of soda acids in vent cabinet
Body has extremely strong corrosivity etc..
2）Control function：To prevent pernicious gas in vent cabinet from escaping, certain suction velocity is needed.Determine vent cabinet
The suction velocity of air inlet will be known as, the heat that experiment content generates and the relationship with rate of ventilation.Wherein important is experiments
The property of content and nuisance.The face wind speed of national Specification, vent cabinet is 0.5 m/s ± 10%.In order to ensure such
Wind speed, exhaust blower should have a necessary static pressure, i.e., frictional resistance when air passes through ventilation shaft.
Traditional vent cabinet control mode：Straight-line：Control panel is installed on vent cabinet and directly initiates exhaust blower, same to time control
Air-valve processed is opened, and air draft is carried out.Advantage is easy for installation simple, can close valve when not used.Disadvantage exhaust blower utilization rate is not high,
Cabinet door open position of divulging information variation air-valve is constant always, if door closes too small, wind pressure is very big in vent cabinet.Men Kai get Tai
Greatly, flow velocity is excessively high, is also easy to produce vortex and cannot meet 0.5M/S wind speed.
Valve control type：Displacement sensor, control panel are installed on vent cabinet.It can remotely start wind turbine, can control
Valve for air exhaust size.Advantage valve can change with the high variation of door avoids that Men Kai get is too small, and wind pressure is too big in cabinet；Disadvantage
The stability contorting of wind speed cannot be met, and when wind turbine underfrequency, face wind speed is also not achieved 0.5MS or is more than.
Air velocity transducer type：Air velocity transducer, control panel are installed on vent cabinet.Meet more than under conditions of can when
Actual measured amount face wind speed, valve reduces when wind speed is more than preset value face to face, otherwise valve increases.Advantage can be measured and be controlled in real time
Wind speed, to reach stable state.Disadvantage is since gentle breeze speed sensor probe is thermoinduction principle, so interference is larger, such as
Outside disturbs very greatly if having air-conditioner air outlet or fan to be blown against it, valve can be caused constantly to beat, if Time delay measurement, just
It can influence its time performance.
Wind speed cabinet door stroke type：Wind speed is added in this mode, and displacement sensor is mainly obtained currently by climb displacement area
The air quantity needed, in the position for reaching corresponding air quantity using valve.Such mode is more demanding to air-valve, need to do air flow calibration.
It is the common control mode of dish valve above, in addition existing wind speed cabinet door stroke type is not belonging to common dish valve, this
Kind mode is more demanding to valve, need to be controlled in conjunction with machinery and electronic journey.
Invention content
The purpose of the present invention is to solve disadvantages existing in the prior art, and the one kind proposed can effectively solve the problem that now
There are the problem of technology, air draft wind speed to stablize smoothness, ensure that the safety of experimenter, wind turbine utilization rate is made to be promoted, section
Save the wind pressure type fume hood controller of energy consumption.
To achieve the goals above, present invention employs following technical solutions：
A kind of wind pressure type fume hood controller, including be set to and test several indoor vent cabinets and for controlling
State several controllers of vent cabinet air draft, the controller is differential pressure type fume hood controller, and the controller is by vent cabinet
Exhaust air rate by RS485 telecommunication circuits be transferred to mend wind controller, the benefit wind controller is connect with pressure difference control cabinet, described
Pressure difference control cabinet is connect with pressure difference touch screen；
Pressure sensor and displacement sensor are respectively equipped at the top of the vent cabinet, the side of the vent cabinet is set respectively
There are an air velocity transducer and operation panel, the front side surface of the vent cabinet is equipped with human body sensor, the pressure sensor,
Displacement sensor, air velocity transducer, human body sensor and operation panel are connect with the controller；
The controller is also opened with power supply adaptor, remote communication module, fan valve executor, lighting device, wind turbine respectively
Dynamic device is connected with automatic door drive system.
Preferably, the controller includes processor, IIC memories, display touch screen, driving circuit, buzzer, LED
Status indicator lamp, RS485 telecommunication circuits, A/D adjustment operational amplifier circuit, air quantity feedback device and wind speed measuring device, D/A adjustment fortune
Discharge road, electric air valve actuator driving circuit and POWER power circuits；The processor respectively with IIC memories, aobvious
Show touch screen, driving circuit, LED state indicator light, RS485 telecommunication circuits, A/D adjustment operational amplifier circuit, D/A adjustment operational amplifier circuits
It is connected with POWER power circuits, the driving circuit is connect with buzzer, and the A/D adjustment operational amplifier circuits are filled with air quantity feedback
It sets and is connected with wind speed measuring device, the D/A adjustment operational amplifier circuit is connect with electric air valve actuator driving circuit.
Preferably, the processor is ATMEGA128A processors.
Preferably, the vent cabinet is equipped with vent cabinet form.
Preferably, air draft air-valve is passed sequentially through at the top of the vent cabinet and time exhaust duct is connect with main exhaust duct,
Current equalizer is equipped between the secondary exhaust duct and main exhaust duct.
Preferably, the secondary exhaust duct is equipped with several auxiliary air drafts and automatically adjusts device.
Preferably, the top of the main exhaust duct is equipped with exhaust blower, is equipped between the main exhaust duct and exhaust blower
Air cleaning unit.
Preferably, the exhaust blower is electrically connected by pressure and frequency changer circuit with the controller and pressure difference control cabinet.
The invention has the advantages that：A kind of wind pressure type fume hood controller of the present invention, including it is set to reality
Several indoor vent cabinets and several controllers for controlling the vent cabinet air draft are tested, the controller is pressure
Poor type fume hood controller, the controller by the exhaust air rate of vent cabinet by RS485 bus transfers to mend wind controller, it is described
It mends wind controller to connect with pressure difference control cabinet, the pressure difference control cabinet is connect with pressure difference touch screen；The present invention using the above structure,
Solving the discharge of the toxic gas of chemical laboratory well, air draft wind speed stablizes smoothness, ensure that the safety of experimenter,
Using adjustment type frequency control, wind turbine utilization rate is made to be promoted, save energy consumption, pass through the operation that works for a long time, it was demonstrated that the row
The feasibility and validity of wind system.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the block diagram of the present invention.
Fig. 3 is the block diagram of controller in the present invention.
Fig. 4 is laboratory entirety air draft schematic diagram when the present invention uses.
Fig. 5 is the schematic diagram of the POWER power circuits of controller in the present invention.
Fig. 6 is the schematic diagram of the A/D and D/A adjustment circuits of controller in the present invention.
Fig. 7 is the program flow diagram of the present invention.
In figure：Wind controller, 5 pressure difference controls are mended in 1 vent cabinet, 1-1 vent cabinets form, 2 controllers, 3RS485 telecommunication circuits, 4
Case processed, 6 pressure difference touch screens, 7 pressure sensors, 8 displacement sensors, 9 air velocity transducers, 10 operation panels, 11 human body sensings pass
Sensor, 12 power supply adaptors, 13 remote communication modules, 14 fan valve executors, 15 lighting devices, 16 wind turbine starters, 17 are certainly
Dynamic door drive system, 18 processors, 19IIC memories, 20 display touch screens, 21 driving circuits, 22 buzzers, 23LED states
Indicator light, 24A/D adjustment operational amplifier circuit, 25 air quantity feedback devices and wind speed measuring device, 26D/A adjustment operational amplifier circuit, 27 electricity
Dynamic fan valve executor driving circuit, 28POWER power circuits, 29 air draft air-valves, 30 exhaust ducts, 31 main exhaust ducts, 32
Current equalizer, 33 auxiliary air draft automatic adjustment devices, 34 exhaust blowers, 35 air cleaning units, 36 pressure and frequency changer circuit.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
- Fig. 7 referring to Fig.1, a kind of wind pressure type fume hood controller, including be set to indoor several vent cabinets 1 of experiment, with
And several controllers 2 for controlling 1 air draft of the vent cabinet, which is characterized in that the controller 2 is differential pressure type vent cabinet
The exhaust air rate of vent cabinet 1 is transferred to by RS485 telecommunication circuits 3 and mends wind controller 4, the benefit by controller, the controller 2
Wind controller 4 is connect with pressure difference control cabinet 5, and the pressure difference control cabinet 5 is connect with pressure difference touch screen 6；
The top of the vent cabinet 1 is respectively equipped with pressure sensor 7 and displacement sensor 8, the side point of the vent cabinet 1
Not She You air velocity transducer 9 and operation panel 10, the front side surface of the vent cabinet 1 is equipped with human body sensor 11, described
Pressure sensor 7, displacement sensor 8, air velocity transducer 9, human body sensor 11 and operation panel 10 with the control
Device 2 connects；Wherein, the vent cabinet 1 is equipped with vent cabinet form 1-1, can be observed to divulge information by vent cabinet form 1-1 here
Situation in cabinet 1.
The controller 2 also respectively with power supply adaptor 12, remote communication module 13, fan valve executor 14, lighting device
15, wind turbine starter 16 and automatic door drive system 17 connect.
Specifically, the controller 2 includes processor 18, IIC memories 19, display touch screen 20, driving circuit 21, bee
Ring device 22, LED state indicator light 23, RS485 telecommunication circuits 3, A/D adjustment operational amplifier circuit 24, air quantity feedback device and wind speed are surveyed
Measure device 25, D/A adjustment operational amplifier circuit 26, electric air valve actuator driving circuit 27 and POWER power circuits 28；The processing
Device 18 communicates electricity with the IIC memories 19, display touch screen 20, driving circuit 21, LED state indicator light 23, RS485 respectively
Road 3, A/D adjustment operational amplifier circuit 24, D/A adjustment operational amplifier circuit 26 and POWER power circuits 28 connect, the driving circuit 21 with
Buzzer 22 connects, and the A/D adjustment operational amplifier circuit 24 is connect with air quantity feedback device and wind speed measuring device 25, the D/A
Adjustment operational amplifier circuit 26 is connect with electric air valve actuator driving circuit 27.
Wherein, the top of the vent cabinet 1 passes sequentially through air draft air-valve 29 and time exhaust duct 30 and main exhaust duct 31
Connection is equipped with current equalizer 32 between the secondary exhaust duct 30 and main exhaust duct 31.The secondary exhaust duct 30 is equipped with
Several auxiliary air drafts automatically adjust device 33.The top of the main exhaust duct 31 is equipped with exhaust blower 34, the main exhaust duct
Air cleaning unit 35 is equipped between 31 and exhaust blower 34.The exhaust blower 34 passes through pressure and frequency changer circuit 36 and the control
Device 2 and pressure difference control cabinet 5 are electrically connected.
The major function of above controller circuit has been to respond the input of external environment, such as someone unmanned state input, wind
Valve opening and closing degree, feed back input amount, artificial setting input quantity etc..By judging and calculating, exports certain voltage control and execute
Device forms a closed-loop control, while the exhaust air rate of current laboratory hood is transferred to benefit wind by controller by RS485 telecommunication circuits
Controller.
Specifically, the processor 18 is ATMEGA128A processors, in the present embodiment, what which used
MCU is the ATMGEA128A processors of ATMGEA companies, which is an embedded 8bit, carries 128KB high speeds flash
Memory.Serial communication interface containing wide scope in piece, the SRAM of 4KB in piece, multiple timers, 18 road 10bitADC,
The external interrupt etc. in the channels PWM and 32 GPIO and multiple edges or level triggers, makes it especially suitable for Industry Control.
Specifically, POWER power circuits 28 realize that Single port AC24V or DC24V are inputted, the positive and negative 12V, 5V of output direct current,
3.3V.Input uses Half bridge rectifier circuit, realizes same port input AC or DC power supply, adapts to varying environment and needs.It is whole
After stream, by TL2575HV-121KV element circuits, by voltage stabilization to+12V.TL2575 family chips are that simple step drop is opened
Voltage-stablizer is closed, transfer efficiency is up to 90%, solves the problems, such as that the big fever of the pressure difference of 78XX series LDO type voltage-stabilizing devices is big.Circuit
Subsequently use ICL7662CBA voltage conversion circuit generation -12V power supplys, TL2575HV-05IKV and AD1117L generate 5V and
3.3V power supply.
Specifically, A/D adjustment operational amplifier circuits 24 and D/A adjustment operational amplifier circuit 26 mainly realize analog signal filtering, voltage
The functions such as conversion matching.Analog input signal is respectively someone, unmanned state's input, before the signal is by infrared induction workbench
State in sector region, and someone/unmanned state is converted to the voltage of 12V or 0V；Form aperture inputs, which is anti-
It answers the workbench window to open the signal of height, is obtained by a displacement sensor for being connected to window, input signal is respectively
The linear change of 0-10V；Wind speed feed back input FB, the signal are the signal of the 0-10V obtained by air velocity transducer, other inputs
Signal, such as pressure difference, power supply status, input drive signal.
In the present embodiment, the controller Main Basiss form height, wind pressure feedback quantity, wind speed feedback quantity calculate the big of air draft
It is small, it is compared with the wind speed of setting, exporting corresponding signal makes valve reach suitable position, and relevant parameter is shown to screen
On.
In conclusion the exhaust system of the wind pressure type fume hood controller solves the toxic gas of chemical laboratory well
The discharge of body, air draft wind speed stablize smoothness, ensure that the safety of experimenter, using adjustment type frequency control, wind turbine is made to utilize
Rate is promoted, and is saved energy consumption, is passed through the operation that works for a long time, it was demonstrated that the feasibility and validity of the exhaust system.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of wind pressure type fume hood controller, including it is set to several indoor vent cabinets of experiment（1）And for controlling
State vent cabinet（1）Several controllers of air draft（2）, which is characterized in that the controller（2）It is controlled for differential pressure type vent cabinet
Device, the controller（2）By vent cabinet（1）Exhaust air rate pass through RS485 telecommunication circuits（3）It is transferred to and mends wind controller（4）, institute
It states and mends wind controller（4）With pressure difference control cabinet（5）Connection, the pressure difference control cabinet（5）With pressure difference touch screen（6）Connection；
The vent cabinet（1）Top be respectively equipped with pressure sensor（7）And displacement sensor（8）, the vent cabinet（1）One
Side is respectively equipped with air velocity transducer（9）And operation panel（10）, the vent cabinet（1）Front side surface equipped with human body sensing sense
Device（11）, the pressure sensor（7）, displacement sensor（8）, air velocity transducer（9）, human body sensor（11）And operation
Panel（10）With the controller（2）Connection；
The controller（2）Also respectively with power supply adaptor（12）, remote communication module（13）, fan valve executor（14）, illumination
Device（15）, wind turbine starter（16）With automatic door drive system（17）Connection.
2. a kind of wind pressure type fume hood controller according to claim 1, which is characterized in that the controller（2）Including
Processor（18）, IIC memories（19）, display touch screen（20）, driving circuit（21）, buzzer（22）, LED state indicator light
（23）, RS485 telecommunication circuits（3）, A/D adjust operational amplifier circuit（24）, air quantity feedback device and wind speed measuring device（25）、D/A
Adjust operational amplifier circuit（26）, electric air valve actuator driving circuit（27）With POWER power circuits（28）；The processor（18）
Respectively with the IIC memories（19）, display touch screen（20）, driving circuit（21）, LED state indicator light（23）, RS485 it is logical
Believe circuit（3）, A/D adjust operational amplifier circuit（24）, D/A adjust operational amplifier circuit（26）With POWER power circuits（28）Connection, it is described
Driving circuit（21）With buzzer（22）Connection, the A/D adjust operational amplifier circuit（24）With air quantity feedback device and measuring wind speed
Device（25）Connection, the D/A adjust operational amplifier circuit（26）With electric air valve actuator driving circuit（27）Connection.
3. a kind of wind pressure type fume hood controller according to claim 2, which is characterized in that the processor（18）For
ATMEGA128A processors.
4. a kind of wind pressure type fume hood controller according to claim 1, which is characterized in that the vent cabinet（1）On set
There is vent cabinet form（1-1）.
5. a kind of wind pressure type fume hood controller according to claim 1, which is characterized in that the vent cabinet（1）Top
Portion passes sequentially through air draft air-valve（29）With secondary exhaust duct（30）With main exhaust duct（31）Connection, the secondary exhaust duct（30）
With main exhaust duct（31）Between be equipped with current equalizer（32）.
6. a kind of wind pressure type fume hood controller according to claim 5, which is characterized in that the secondary exhaust duct（30）
It is equipped with several auxiliary air drafts and automatically adjusts device（33）.
7. a kind of wind pressure type fume hood controller according to claim 5, which is characterized in that the main exhaust duct（31）
Top be equipped with exhaust blower（34）, the main exhaust duct（31）With exhaust blower（34）Between be equipped with air cleaning unit（35）.
8. a kind of wind pressure type fume hood controller according to claim 7, which is characterized in that the exhaust blower（34）Pass through
Pressure and frequency changer circuit（36）With the controller（2）With pressure difference control cabinet（5）It is electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721723491.8U CN207695290U (en) | 2017-12-12 | 2017-12-12 | A kind of wind pressure type fume hood controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721723491.8U CN207695290U (en) | 2017-12-12 | 2017-12-12 | A kind of wind pressure type fume hood controller |
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| Publication Number | Publication Date |
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| CN207695290U true CN207695290U (en) | 2018-08-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107812769A (en) * | 2017-12-12 | 2018-03-20 | 湖南普信工程技术有限公司 | A kind of wind pressure type fume hood controller |
-
2017
- 2017-12-12 CN CN201721723491.8U patent/CN207695290U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107812769A (en) * | 2017-12-12 | 2018-03-20 | 湖南普信工程技术有限公司 | A kind of wind pressure type fume hood controller |
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