CN205966710U - Ventilation hood panel air -speed control system - Google Patents
Ventilation hood panel air -speed control system Download PDFInfo
- Publication number
- CN205966710U CN205966710U CN201620782252.9U CN201620782252U CN205966710U CN 205966710 U CN205966710 U CN 205966710U CN 201620782252 U CN201620782252 U CN 201620782252U CN 205966710 U CN205966710 U CN 205966710U
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- wind speed
- control system
- speed control
- cabinet
- ventilated chamber
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Abstract
Ventilation hood panel air -speed control system, including the cabinet body and exhaust pipe, be provided with the butterfly valve in the exhaust pipe, still include pressure differential detection device, pressure differential detection device includes detecting element for internal and the external atmospheric pressure difference of cabinet of detecting box, and output detection signal, one -shot multivibrator is coupled and is used for received sample voltage in detecting element to control signal is exported to the butterfly valve to amplitude according to the detected signal, with the aperture of adjusting the butterfly valve. Through detecting element come the detecting box internal with the external atmospheric pressure difference of cabinet, when atmospheric pressure difference is too big, detecting element output detection signal, one -shot multivibrator receive this detected signal, the control butterfly valve reduces or increases maximum open degree according to the actual demand, makes the internal negative pressure convergence of cabinet in stablizing numerical value, has effectively prevented the circumstances emergence of gaseous appearance leakage.
Description
Technical field
This utility model is related to Mechatronic Systems, particularly to a kind of ventilated chamber face wind speed control system.
Background technology
Ventilated chamber is wide variety of a kind of ventilation installation both at home and abroad at present.Ventilated chamber is multiple functional, and protection is tight, both gives
Operator comprehensively protect, and withstand the corrosion of all kinds of chemical acid alkalis and organic reagent again, and do not stain the test sample of inside
Product.It ensure that gas smooth discharge poisonous, harmful, odorous, makes experimental situation reach national regulation regulation（0.5m/s）
Safe effect, but tradition ventilation cabinet adopts forced draft outside toxic gas discharge chamber, will to cause the serious of indoor and temperature
Loss and the imbalance of indoor and outdoor air pressure, make troubles to experimenter and even test hidden danger.
Notification number is to disclose a kind of ventilated chamber face wind speed control system in CN202700932U, and it proposes this ventilated chamber face
Wind speed control system includes displacement transducer, PID controller, air-valve driver, reductor, dish valve, micro-control unit, input
Keyboard, display device, alarm device；It is turned on and off by being arranged on the displacement transducer of cabinet face form and gathering cabinet face form
When relative altitude signal, and altitude signal be converted to the corresponding signal of telecommunication input to PID controller, and pass through PID control
Device, to control butterfly valve action, to adjust the speed of the air draft in exhaust duct, but divulges information cabinet generally not sealing, only by
Displacement transducer can not be accurately obtained the accurate data of the negative pressure in cabinet.
Utility model content
The purpose of this utility model is to provide a kind of ventilated chamber face wind speed control system, has and can make bearing in cabinet
Pressure tends towards stability, and the situation of the gas leakage being effectively reduced in ventilated chamber occurs.
Above-mentioned purpose of the present utility model technical scheme is that：
Ventilated chamber face wind speed control system, including cabinet and exhaust duct, is provided with butterfly valve, also wraps in described exhaust duct
Include pressure test device, described pressure test device includes
Detecting element, for the draught head in detecting box body and outside cabinet, and exports detection signal；
Single-shot trigger circuit, is coupled to detecting element and is used for receiving sampled voltage, and according to detection signal amplitude to
Butterfly valve output control signal, with the aperture of regulating butterfly valve.
By adopting technique scheme, by detecting element come the draught head in detecting box body and outside cabinet, work as air pressure
When difference is excessive, detecting element exports detection signal, and single-shot trigger circuit receives this detection signal, controls butterfly valve according to actual need
Ask minimizing or increase aperture, make the negative pressure in cabinet level off to stability number, effectively prevent gas the situation of leakage occurs and send out
Raw.
As improvement of the present utility model, described detecting element is differential pressure pickup.
By adopting technique scheme, differential pressure pickup is a kind of sensing for measuring difference between two air pressure
Device.
As improvement of the present utility model, the side plate of described cabinet offers through hole, described differential pressure pickup includes
One contact and the second contact, described first contact and the second contact pass through a wire and connect, and described first contact runs through described logical
Cross the outside being fixedly installed on side plate, described second contact is fixedly installed on the inner side of side plate.
By adopting technique scheme, general ventilated chamber is not in order to improve the stability of ventilated chamber on its side plate
It is provided with vent, so differential pressure pickup is run through side plate by a through hole, make the detection to pressure differential not be subject to air-flow
Impact, make testing result more accurate.
As improvement of the present utility model, described through hole is provided with the sealing ring being detachably connected.
By adopting technique scheme, after differential pressure pickup has been fixedly installed, through hole is provided with and detachably connects
The sealing ring connecing, prevents the air in air entrance or cabinet outside cabinet from flowing out, to affect the accuracy of detection of differential pressure pickup.
As improvement of the present utility model, the air outlet of described exhaust duct is provided with alarm device and is coupled to warning dress
Put the wind speed detection device for detection air port wind speed, the described wind speed detection device when the wind speed of air outlet is less than preset value
Output alarm signal, described alarm device works in response to described alarm signal.
By adopting technique scheme, air outlet is provided with wind speed detection device, due to the air-out of national regulation
Speed be 0.5m/s, and pressure test device be provided with can exist make air output be less than 0.5m/s situation occur, be discontented with
The regulation of foot country, so remind staff to take measures now by alarm device.
As improvement of the present utility model, described wind speed detection device includes
Sampling unit, described sampling unit is used for gathering the wind speed of air outlet and being converted to sampled voltage；
Reference cell, for providing corresponding reference voltage described in preset value；
Comparing unit, is coupled to sampling unit and reference cell, is used for comparing sampled voltage and reference voltage, when sampling electricity
When pressure is less than reference voltage, described comparing unit output alarm signal.
By adopting technique scheme, by the sampling unit of detection air port air quantity, the benchmark corresponding to preset value
Voltage, and compare the setting of the comparing unit of sampled voltage and reference voltage and make the output of alarm signal more accurate.
As improvement of the present utility model, described sampling unit is set to air velocity transducer.
By adopting technique scheme, air velocity transducer is can be with the wind speed of connecting detection predetermined position, air quantity（Wind
Amount=wind speed * cross-sectional area）Size, is that the collection to wind speed is more accurate.
As improvement of the present utility model, described air velocity transducer is fixedly installed on the optional position of air outlet.
By adopting technique scheme, because air quantity/wind speed that air outlet optional position goes out is equal in magnitude, so wind speed
Sensor can arrange at an arbitrary position, in order to prevent air velocity transducer to be blown away, so air velocity transducer is fixedly installed（Permissible
Prevented by gluing, welding etc.）.
As improvement of the present utility model, described alarm device is buzzer.
By adopting technique scheme, the reminding effect to staff during operation irregularity is realized in the setting of buzzer.
As improvement of the present utility model, between described buzzer and wind speed detection device, it is provided with speech chip.
By adopting technique scheme, the setting of speech chip is by being inputted in speech chip in the form of pre- typing
Sound, is that warning effect is various, and to more easily discriminate between be that what device is reported to the police.
In sum, this utility model has the advantages that：By detecting element come in detecting box body and outside cabinet
Draught head, when draught head is excessive, detecting element exports detection signal, and single-shot trigger circuit receives this detection signal, control
Butterfly valve processed reduces according to the actual requirements or increases aperture, makes the negative pressure in cabinet level off to stability number, effectively prevent gas
Situation leakage occurs.
Brief description
Fig. 1 is ventilated chamber structural representation；
Fig. 2 is pressure test device connection circuit figure；
Fig. 3 is wind speed detection device and alarm device connection circuit figure；
Fig. 4 is the alarm device connection circuit figure of embodiment 2.
In figure, 1, cabinet；11st, exhaust duct；13rd, butterfly valve；2nd, differential pressure pickup；21st, single-shot trigger circuit；3rd, wind speed
Detection means；31st, sampling unit；311st, air velocity transducer；32nd, reference cell；33rd, comparing unit；4th, alarm device.
Specific embodiment
Below in conjunction with accompanying drawing, this utility model is described in further detail.
Embodiment 1,
Referring to figs. 1 to shown in Fig. 2, ventilated chamber face wind speed control system includes cabinet 1 and exhaust duct 11 and pressure differential detection
Device, exhaust duct 11 is provided with butterfly valve 13, and this pressure test device includes detecting element and single-shot trigger circuit 21, inspection
Survey element and be set to differential pressure pickup 2, wherein, the side plate of cabinet 1 offers through hole, this through hole is provided through this through hole
Differential pressure pickup 2, this differential pressure pickup 2 includes the first contact and the second contact, and the first contact and the second contact are led by one
Line connects, the first contact run through described by being fixedly installed on the outside of side plate, the second contact is fixedly installed on the inner side of side plate,
It is additionally provided with sealing ring on this through hole（Clearly do not indicate in figure）, the sealing ring that this sealing ring is made for quality of rubber materials, pressure reduction
The outfan of sensor 2 couples single-shot trigger circuit 21, and single-shot trigger circuit 21 is used for receiving detection signal by detection
The amplitude of signal is to butterfly valve 13 output control signal with the aperture of regulating butterfly valve 13.
With reference to shown in Fig. 3, the air outlet of exhaust duct 11 is provided with alarm device 4 and is coupled to alarm device 4 and is used for examining
Measure the wind speed detection device 3 of air port wind speed, the described wind speed detection device 3 output report when the wind speed of air outlet is less than preset value
Alert signal, alarm device 4 works in response to described alarm signal, and wherein, wind speed detection device 3 is included for gathering air outlet
Wind speed is simultaneously converted to the sampling unit 31 of sampled voltage, and this sampling unit 31 is set to air velocity transducer 311, this air velocity transducer
311 optional positions being fixedly installed on air outlet, reference cell 32 includes resistance R1 and R2 being arranged in series, wherein resistance R1 and
The node that R2 couples utilizes electric resistance partial pressure principle output reference voltage, and resistance R1 and R2 may be arranged as adjustable resistance simultaneously,
Comparing unit 33 is set to comparator, and the positive input of this comparator couples reference voltage, and reverse input end couples wind speed and passes
Sensor 311, when sampled voltage be less than reference voltage when, comparator output alarm signal, alarm device 4 include NPN triode and
Buzzer, this NPN triode here as switching component, when the base stage of NPN triode receives high level signal,
During NPN triode conducting, buzzer sends sound.
Embodiment 2, with reference to shown in Fig. 4, as different from Example 1, also sets between buzzer and wind speed detection device 3
It is equipped with a speech chip, input sound in this speech chip in the form of pre- typing, make warning effect various and more eye-catching,
Make warning effect more preferably.
This specific embodiment is only that it is not to restriction of the present utility model, ability to explanation of the present utility model
Field technique personnel can make to the present embodiment after reading this specification as needed does not have the modification of creative contribution, but
As long as all being protected by Patent Law in right of the present utility model.
Claims (10)
1. ventilated chamber face wind speed control system, including cabinet (1) and exhaust duct (11), is provided with described exhaust duct (11)
Butterfly valve (13) it is characterised in that：Also include pressure test device, described pressure test device includes
Detecting element, for detecting in cabinet (1) and cabinet (1) draught head outward, and exports detection signal；
Single-shot trigger circuit (21), is coupled to detecting element, for receiving detection signal, and according to detection signal amplitude to
Butterfly valve (13) output control signal, with the aperture of regulating butterfly valve (13).
2. ventilated chamber face wind speed control system according to claim 1 it is characterised in that：Described detecting element passes for pressure reduction
Sensor (2).
3. ventilated chamber face wind speed control system according to claim 2 it is characterised in that：On the side plate of described cabinet (1)
Offer through hole, described differential pressure pickup (2) includes the first contact and the second contact, described first contact and the second contact pass through
One wire connects, described first contact run through described by being fixedly installed on the outside of side plate, described second contact is fixedly installed
Inner side in side plate.
4. ventilated chamber face wind speed control system according to claim 3 it is characterised in that：It is provided with removable on described through hole
Unload the sealing ring of connection.
5. ventilated chamber face wind speed control system according to claim 1 it is characterised in that：The going out of described exhaust duct (11)
Air port is provided with alarm device (4) and is coupled to alarm device (4) for the wind speed detection device (3) of detection air port wind speed,
Described wind speed detection device (3) output alarm signal when the wind speed of air outlet is less than preset value, described alarm device (4) response
In the work of described alarm signal.
6. ventilated chamber face wind speed control system according to claim 5 it is characterised in that：Described wind speed detection device (3)
Including
Sampling unit (31), described sampling unit (31) is used for gathering the wind speed of air outlet and being converted to sampled voltage；
Reference cell (32), for providing preset value corresponding reference voltage；
Comparing unit (33), is coupled to sampling unit (31) and reference cell (32), is used for comparing sampled voltage and reference voltage,
When sampled voltage is less than reference voltage, described comparing unit (33) output alarm signal.
7. ventilated chamber face wind speed control system according to claim 6 it is characterised in that：Described sampling unit (31) setting
For air velocity transducer (311).
8. ventilated chamber face wind speed control system according to claim 7 it is characterised in that：Described air velocity transducer (311)
It is fixedly installed on the optional position of air outlet.
9. ventilated chamber face wind speed control system according to claim 5 it is characterised in that：Described alarm device (4) is honeybee
Ring device.
10. ventilated chamber face wind speed control system according to claim 9 it is characterised in that：Described buzzer and wind speed inspection
Survey and be provided with speech chip between device (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620782252.9U CN205966710U (en) | 2016-07-22 | 2016-07-22 | Ventilation hood panel air -speed control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620782252.9U CN205966710U (en) | 2016-07-22 | 2016-07-22 | Ventilation hood panel air -speed control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205966710U true CN205966710U (en) | 2017-02-22 |
Family
ID=58025555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620782252.9U Expired - Fee Related CN205966710U (en) | 2016-07-22 | 2016-07-22 | Ventilation hood panel air -speed control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205966710U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107052017A (en) * | 2017-06-16 | 2017-08-18 | 淄博豪迈实验室装备有限公司 | A kind of special ventilation equipment in Environment-friendlycorrosion-resistant corrosion-resistant type laboratory |
| CN108872629A (en) * | 2018-07-02 | 2018-11-23 | 珠海格力电器股份有限公司 | Wind speed and wind volume detection device and detection method thereof |
| CN111141000A (en) * | 2018-11-06 | 2020-05-12 | 奥克斯空调股份有限公司 | Mobile air conditioner air outlet abnormity prompting method and mobile air conditioner |
-
2016
- 2016-07-22 CN CN201620782252.9U patent/CN205966710U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107052017A (en) * | 2017-06-16 | 2017-08-18 | 淄博豪迈实验室装备有限公司 | A kind of special ventilation equipment in Environment-friendlycorrosion-resistant corrosion-resistant type laboratory |
| CN107052017B (en) * | 2017-06-16 | 2019-09-10 | 淄博豪迈实验室装备有限公司 | A kind of dedicated ventilation equipment in Environment-friendlycorrosion-resistant corrosion-resistant type laboratory |
| CN108872629A (en) * | 2018-07-02 | 2018-11-23 | 珠海格力电器股份有限公司 | Wind speed and wind volume detection device and detection method thereof |
| CN111141000A (en) * | 2018-11-06 | 2020-05-12 | 奥克斯空调股份有限公司 | Mobile air conditioner air outlet abnormity prompting method and mobile air conditioner |
| CN111141000B (en) * | 2018-11-06 | 2021-05-18 | 奥克斯空调股份有限公司 | Mobile air conditioner air outlet abnormity prompting method and mobile air conditioner |
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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 |
Granted publication date: 20170222 Termination date: 20210722 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |