CN101912863B - Multi-ventilated-case cooperating exhaust control system - Google Patents
Multi-ventilated-case cooperating exhaust control system Download PDFInfo
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- CN101912863B CN101912863B CN2010102335139A CN201010233513A CN101912863B CN 101912863 B CN101912863 B CN 101912863B CN 2010102335139 A CN2010102335139 A CN 2010102335139A CN 201010233513 A CN201010233513 A CN 201010233513A CN 101912863 B CN101912863 B CN 101912863B
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Abstract
The invention relates to a multi-ventilated-case cooperating exhaust control system which comprises an exhaust fan and more than two ventilated cases, wherein the exhaust fan is arranged on a main ventilation pipeline, and the more than two ventilated cases are communicated with the main ventilation pipeline. The invention is characterized in that a first differential pressure sensor is arranged in front of an inlet of the exhaust fan, a wind pressure signal in the main ventilation pipeline is transferred to a first signal modulator by the first differential pressure sensor, a modulation signal is transferred to a frequency changer by the first signal modulator, and the exhaust fan is dragged by the frequency changer. The invention not only can realize the control for the gas speed in the pipeline and the exhaust flow speed of the ventilated cases, but also has the advantage of reliable and accurate control and saves the energy consumption of the fan through a method for detecting the air pressure in the ventilation pipeline and by automatically controlling the rotating speed of the fan after signal modulation. The invention can be used in a multi-ventilated-case cooperating laboratory exhaust system.
Description
Technical field
The present invention relates to the exhaust control system of vent cabinet, particularly the exhaust control system of many vent cabinet parallel runnings.
Background technology
In occasions such as laboratories, need to guarantee the parameter stabilities such as temperature, air pressure, wind speed of indoor or test operation platform, and can in time get rid of test waste gas and used heat that vent cabinet is the device that must be provided with for this reason.Said vent cabinet is a kind of cabinet with the relative closure in certain cavity volume space, is provided with movably cabinet door in cabinet the place ahead, is provided with operating platform in the cabinet, utilizes this platform to be engaged in various physico-chemical tests behind the door thereby can let the experimenter open cabinet.Yet in experimentation, ordinary test all requires experimental enviroment constant voltage, constant temperature or constant humidity, and one of a kind of reliable way is exactly that to keep the face wind speed at vent cabinet cabinet door place constant as far as possible for this reason.Need give exhaust to the air in the cabinet yet the face wind speed of keeping cabinet door place is constant; Traditional scheme is exactly on the discharge duct of the top of each vent cabinet or vent cabinet, blower fan to be set; This scheme is relatively simple, but defective clearly is exactly that energy consumption is big, noise is high; Secondly in a laboratory, install under the situation of many vent cabinets, the many inevitable noises of air draft blower fan are bigger, cause experimental enviroment very bad, have only for this reason exhaust blower is installed to outdoor; But so cause exhaust duct overhead in the laboratory to stand in great numbers again, it is big not only to take up room, and waste material, and energy consumption is big.
To the problems referred to above; One Chinese patent application of the prior art number is 200920137224.1 utility model; Proposition relates to a kind of ventilator for laboratory; Comprise some ventilation cabinets or suspended hood, unifiedly after the wind exhausting outlet parallel connection UNICOM of said each cabinet or suspended hood be connected with fast blower fan more than with wind exhausting outlet.The utility model device only needs a typhoon machine, a cover exhaust duct; Can realize breadboard vented exhaust, guarantee laboratory operation personnel's the health and the quality of laboratory environment, simplify the structure on the one hand; Improved installation effectiveness; Significantly reduced manufacturing cost, decided the size of rotation speed of fan according to the quantity of opening ventilation cabinet or suspended hood on the other hand, thereby help energy-conserving and environment-protective.This scheme really than before scheme certain progress has been arranged, but it directly decides the size of rotation speed of fan according to the quantity of opening ventilation cabinet or suspended hood, not only control accuracy is low but also be difficult to stablize the face wind speed of each vent cabinet.
Summary of the invention
The present invention is directed to the deficiency of prior art; A kind of exhaust control system of many vent cabinet parallel runnings is proposed; Not only to reduce whole system operation noise and energy consumption; And the air draft blast of guaranteeing whole system keeps stablely, even will guarantee that also the face wind speed of each vent cabinet keeps stable.Technical scheme of the present invention for this reason is following:
The vent cabinet exhaust control system of many cooperatings comprises the exhaust blower that is arranged on the main ventilation pipeline, the vent cabinet more than two that is communicated with the main ventilation pipeline; It is characterized in that; Inlet the place ahead at said exhaust blower is provided with first differential pressure pickup; Said first differential pressure pickup passes to first signal modulator with the wind pressure signal in the said main ventilation pipeline; Said first signal modulator passes to frequency converter with modulation signal, and said frequency converter drags said exhaust blower.
Said first differential pressure pickup is a kind of device that can detect main ventilation intraductal atmospheric pressure or differential pressure of atmospheric pressure; Generally can provide the signal of telecommunication below the 5V, not only can detect main ventilation pipeline internal gas pressure and can detection signal be passed to first signal modulator through said first differential pressure pickup; After handling, the signal that said first signal modulator provides said first differential pressure pickup again signal is passed to frequency converter; Thereby said frequency converter can be according to the size of blast in the square tube before the inlet of said exhaust blower, automatically drags blower fan and controls the rotating speed of blower fan.When wherein blast reduces in the main ventilation pipeline, explain that the vent cabinet quantity of opening reduces, thus the wind speed that needs to lower the rotating speed of blower fan and then reduce gas in the main ventilation pipeline; Vice versa.Said first signal modulator generally provide below the 10V (10 volts) or the signal of telecommunication below the 250MA (20 milliamperes) to frequency converter, said frequency converter provides the corresponding again rotating speeds of controlling exhaust blower such as size such as 1V, 1.2V, 3V, 5V or 2MA, 5MA, 10MA of signal according to said first signal modulator.
Wherein said first signal modulator comprises benchmark adjustment module and signal amplification module; Said benchmark adjustment module is modulated the back with the induced signal of said first differential pressure pickup and is exported basic control signal to said frequency converter; Said signal amplification module amplifies the output signal of said benchmark adjustment module or dwindles.Secondly include benchmark in said benchmark adjustment module and regulate button, be used for to regulate the pattern or the size of conversion sampled signal with manual mode, adjust thereby be convenient in the Installation and Debugging process actual condition to the scene; Said signal amplification module includes sensitivity and regulates button, is used for manually regulating or setting in the Installation and Debugging process amplification or the minification size of output signal, thereby improves or reduce the sensitivity of output signal.Secondly can also the intelligentized control program of setting-in in said first signal modulator.
Contrast with prior art; Method and process signal through detecting the air pressure in the main ventilation pipeline are modulated the back is controlled exhaust blower automatically by means of frequency converter rotating speed; Not only can realize control to the exhaust flow velocity of managing interior gas flow rate, vent cabinet; And control is reliable, accurate, the energy consumption of saving exhaust blower.Wherein the signalization modulator not only can be realized the automatic conversion and the modulation of signal, further be, can also adjust sampled signal at engineering site, make the field working conditions theoretical control model of fitting more.
Further technical scheme can also be, the exhaust duct that each said vent cabinet is communicated with said main ventilation pipeline is provided with air-valve; Between the air outlet of said vent cabinet and said air-valve, second differential pressure pickup is set, said second differential pressure pickup passes to the secondary signal modulator, the said air-valve of said secondary signal modulator control with the wind pressure signal in the exhaust duct of said vent cabinet.
Further technical scheme can also be, the exhaust duct that each said vent cabinet is communicated with said main ventilation pipeline is provided with air-valve; Between the air outlet of said vent cabinet and said air-valve, the hot blast sensor is set, said hot blast sensor passes to the secondary signal modulator with the wind velocity signal in the air outlet pipeline of said vent cabinet, the said air-valve of said secondary signal modulator control.
Further technical scheme can also be that said secondary signal modulator comprises benchmark adjustment module and signal amplification module; Said benchmark adjustment module is modulated the signal of said second differential pressure pickup and is exported basic control signal to said air-valve; Said signal amplification module amplifies the output signal of said benchmark adjustment module or dwindles.
According to said structure; Between the air outlet of said vent cabinet and said air-valve, second differential pressure pickup or hot blast sensor are set; And said secondary signal modulator is set on vent cabinet; Detect the blast of vent cabinet air outlet like this by second differential pressure pickup; Or the direct wind speed that detects the vent cabinet air outlet by the hot blast sensor; The size that the valve area in vent cabinet exit modulated but also can directly be regulated by means of these signals again to said secondary signal modulator not only can to the signal that said second differential pressure pickup or hot blast sensor provide, thus the face wind speed of said each vent cabinet of secondary signal modulator control on the basis of regulating air pressure or flow velocity in the main ventilation pipeline through exhaust blower, utilized once more, and control in other words complements one another.
Further technical scheme can also be, sends the enabling signal of said vent cabinet to said frequency converter through holding wire.According to said structure, when any vent cabinet starts, all send enabling signal to said frequency converter.Under the situation of many vent cabinet parallel runnings, can send these contact signal merging to said frequency converter.
Secondly can also be with realizing that signal exchange links between the aperture signal of the air-valve of said vent cabinet itself, wind velocity signal etc. and the frequency converter, thus wind speed control accuracy can be improved greatly to each vent cabinet, also can save energy consumption greatly.For example during the speed step-down in detect finding vent cabinet, can at first increase the aperture of air-valve but need not to increase the speed of exhaust blower; When the aperture of air-valve has been opened but wind speed in the vent cabinet still can't improve the rotating speed that just suitably improves exhaust blower when reaching standard automatically as far as possible, thereby the energy is also saved in the intellectuality that not only can realize whole system.
Because the present invention has These characteristics and advantage, can use in the exhaust system of the laboratory of many vent cabinet cooperations.
Figure of description
Fig. 1 is a device systems structural representation of using technical scheme of the present invention;
Fig. 2 is the system control module structural representation.
The specific embodiment
Further make explanation at length below in conjunction with accompanying drawing to using technical scheme of the present invention.
As depicted in figs. 1 and 2, a kind of exhaust control system of vent cabinet comprises vent cabinet 1, the main ventilation pipeline 2 more than 2 and is arranged on the exhaust blower 3 on the main ventilation pipeline 2; Secondly on said main ventilation pipeline 2 and the place ahead that is positioned at said exhaust blower 3 be provided with first differential pressure pickup 21.The 21 main inductions of said first differential pressure pickup detect the blast in the said main ventilation pipeline 2.Said exhaust blower 3 is worked under the dragging of frequency converter 4.The mounting means of said first differential pressure pickup 21 can carry out the suitability adjustment according to its structure.
Said vent cabinet 1 comprises cabinet, and the front of said cabinet is provided with cabinet door 11, is provided with testing stand in the cabinet, and cabinet top is provided with an exhaust duct 15, and an exhaust duct 15 is provided with the air-valve 13 that can regulate aperture; Secondly said exhaust duct 15 of each vent cabinet 1 is communicated with said main ventilation pipeline 2 respectively.Generally speaking, the air pressure that needs near the space guarantee test platform evenly and also the speed (being the face wind speed) of gas flow maintain about 0.5 meter per second.The aperture of flow velocity in the control exhaust duct 15 or control air-valve 13 can be controlled the face wind speed of said vent cabinet 1 indirectly for this reason.
Also be provided with first signal modulator 5; Said first differential pressure pickup 21 passes to said first signal modulator 5 with detection signal; Send said frequency converter 4 again to after 5 pairs of these signals of said first signal modulator are modulated, and transmit the control signal of different amplitudes to said frequency converter 4 according to the said first differential pressure pickup 21 different wind pressure values that detect.This control signal transmits with the voltage signal mode, and amplitude is between 0～10V; Can certainly transmit with current system, amplitude is between 0～20MA.
According to said structure; When said exhaust blower 3 after starting under the driving of said frequency converter 4; Present negative pressure in the said main ventilation pipeline 2; Said first differential pressure pickup 21 also constantly sends pressure detecting signal to said first signal modulator 5, also transmits control signal corresponding to said frequency converter 4 accordingly after said first signal modulator 5 is modulated the detection signal that picks up.Like this when one of new unlatching or several vent cabinets 1; To cause the negative pressure pressure in the said main ventilation pipeline 2 to diminish; If will cause the negative pressure pressure in the said main ventilation pipeline 2 to raise when closing one or several vent cabinets 2, the pressure signal that correspondingly said first differential pressure pickup 21 picks up is also with difference; Modulation through 5 pairs of pressure signals of said first signal modulator and to the control of said frequency converter 4 like this; Said exhaust blower 2 also can quicken thereupon or slow down; Realized effectively stable control to the exhaust velocity of said vent cabinet 1; Also can reasonably confirm the rotating speed of said exhaust blower 2, reach purpose of energy saving.
Secondly, said first signal modulator 5 comprises benchmark adjustment module and signal amplification module; Said benchmark adjustment module is calculated the signal of said first differential pressure pickup 5 and modulate and to the basic control signal of said frequency converter 4 outputs; Said signal amplification module amplifies the output signal of said benchmark adjustment module or dwindles.Secondly include benchmark in said benchmark adjustment module and regulate button 51, be used for to regulate the pattern or the size of conversion sampled signal with manual mode, adjust thereby be convenient in the Installation and Debugging process actual condition according to the scene; Said signal amplification module includes sensitivity and regulates button 52, is used for manually regulating or setting in the Installation and Debugging process size of output signal, thereby improves or reduce the sensitivity of output signal.In the practical installation and trial process, because changing all possibly appear in the installation site of the size of height above sea level, main ventilation pipeline 2 and length, said first differential pressure pickup 21 and the relative position between the vent cabinet 1.For this reason,, not only can realize the automatic conversion and the modulation of signal through said first signal modulator 5 and the control button thereof, further be, can also adjust sampled signal at engineering site, make the field working conditions theoretical control model of fitting more.
Further technical scheme is, the blast pipe 15 that each said vent cabinet 1 is communicated with said main ventilation pipeline 2 is provided with air-valve 13, on said vent cabinet 1, also is provided with secondary signal modulator 14; Said secondary signal modulator 14 has and first signal modulator, 5 essentially identical functional module and control buttons.Secondly between the air outlet of said vent cabinet 1 and said air-valve 13, second differential pressure pickup 12 is set; Said second differential pressure pickup 12 passes to secondary signal modulator 14 with the wind pressure signal in the air outlet pipeline of said vent cabinet 1, and said secondary signal modulator 14 passes to said air-valve 13 with modulation signal.
Detect the scheme of chain of command wind speed as another kind; In each said vent cabinet 1 air outlet position the hot blast sensor is set; Said hot blast sensor passes to secondary signal modulator 14 with the wind velocity signal in the air outlet pipeline of said vent cabinet 1, and said secondary signal modulator 14 passes to said air-valve 13 with modulation signal.According to said structure; Between the air outlet of said vent cabinet 1 and said air-valve 13, second differential pressure pickup 12 or hot blast sensor are set; And said secondary signal modulator 14 is set on vent cabinet 1; Detect the blast of vent cabinet air outlet like this by second differential pressure pickup 12; Or directly detect the wind speed of vent cabinet 1 air outlet by the hot blast sensor, and directly regulates the aperture of air-valve 13 in vent cabinet 1 exit through said secondary signal modulator 14 big or small, thus on the basis of air pressure in regulating main ventilation pipeline 2 or flow velocity once more the part control the face wind speed of each vent cabinet 1.
Further technical scheme is, sends the enabling signal of said vent cabinet 1 to said frequency converter 4 through holding wire.When any vent cabinet 1 starts, can start frequency converter 4 synchronously and said exhaust blower 2 is started working like this.Under the situation of many said vent cabinet 1 parallel runnings, can send these contact signal lines merging to said frequency converter 2.
According to technique scheme, said second differential pressure pickup 12 or said hot blast sensor itself also can replace with other device or module with similar functions; Secondly their installation site also can rationally be arranged according to the characteristics of these devices itself, for example can be arranged in vent cabinet 1 air outlet sensor or in the cabinet of vent cabinet 1, as long as can relatively directly accurate sampled signal or analog sample signal.
Claims (7)
1. the vent cabinet exhaust control system of many cooperatings comprises the exhaust blower that is arranged on the main ventilation pipeline, the vent cabinet more than two that is communicated with the main ventilation pipeline; It is characterized in that; Inlet the place ahead at said exhaust blower is provided with first differential pressure pickup; Said first differential pressure pickup passes to first signal modulator with the wind pressure signal in the said main ventilation pipeline; Said first signal modulator passes to frequency converter with modulation signal, and said frequency converter drags said exhaust blower.
2. the vent cabinet exhaust control system of many cooperatings according to claim 1 is characterized in that, said first signal modulator comprises benchmark adjustment module and signal amplification module; Said benchmark adjustment module is modulated the signal of said first differential pressure pickup and is exported basic control signal to said frequency converter; Said signal amplification module amplifies the output signal of said benchmark adjustment module or dwindles.
3. the vent cabinet exhaust control system of many cooperatings according to claim 2 is characterized in that, includes benchmark in the said benchmark adjustment module and regulates button, and said signal amplification module includes sensitivity and regulates button.
4. the vent cabinet exhaust control system of many cooperatings according to claim 1 is characterized in that, the exhaust duct that each said vent cabinet is communicated with said main ventilation pipeline is provided with air-valve; Between the air outlet of said vent cabinet and said air-valve, second differential pressure pickup is set, said second differential pressure pickup passes to the secondary signal modulator, the said air-valve of said secondary signal modulator control with the wind pressure signal in the exhaust duct of said vent cabinet.
5. the vent cabinet exhaust control system of many cooperatings according to claim 1 is characterized in that, the exhaust duct that each said vent cabinet is communicated with said main ventilation pipeline is provided with air-valve; Between the air outlet of said vent cabinet and said air-valve, the hot blast sensor is set, said hot blast sensor passes to the secondary signal modulator with the wind velocity signal in the air outlet pipeline of said vent cabinet, the said air-valve of said secondary signal modulator control.
6. the vent cabinet exhaust control system of many cooperatings according to claim 4 is characterized in that, said secondary signal modulator comprises benchmark adjustment module and signal amplification module; Said benchmark adjustment module is modulated the signal of said second differential pressure pickup and is exported basic control signal to said air-valve; Said signal amplification module amplifies the output signal of said benchmark adjustment module or dwindles.
7. the vent cabinet exhaust control system of many cooperatings according to claim 6 is characterized in that, sends the enabling signal of said vent cabinet to said frequency converter through holding wire.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102335139A CN101912863B (en) | 2010-07-22 | 2010-07-22 | Multi-ventilated-case cooperating exhaust control system |
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| CN2010102335139A CN101912863B (en) | 2010-07-22 | 2010-07-22 | Multi-ventilated-case cooperating exhaust control system |
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| CN101912863A CN101912863A (en) | 2010-12-15 |
| CN101912863B true CN101912863B (en) | 2012-03-21 |
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Cited By (1)
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| CN111014218A (en) * | 2019-11-28 | 2020-04-17 | 同济大学 | Centralized air exhaust system and air exhaust method for multiple rubber vulcanizing machines |
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| CN102652948B (en) * | 2011-03-04 | 2015-08-19 | 北京鸣远伟业实验室设备有限公司 | The control method of multiple stage vent cabinet in parallel |
| CN102806399B (en) * | 2011-05-31 | 2014-12-24 | 上海朗仕电子设备有限公司 | Intelligent air-exhaust blowing standby system |
| CN102553878A (en) * | 2012-02-24 | 2012-07-11 | 郑家伟 | Static air exhausting device for laboratory |
| CN103326588B (en) * | 2013-06-20 | 2017-05-03 | 苏州汇川技术有限公司 | high-voltage frequency converter and cabinet top fan control device |
| CN104550180A (en) * | 2014-12-05 | 2015-04-29 | 安徽华盛科技控股股份有限公司 | Intelligent exhaust system for CIT laboratory reagent cabinet |
| CN104858198B (en) * | 2015-04-15 | 2017-12-01 | 广州泛美实验室系统科技股份有限公司 | A kind of energy-saving safe perchloric acid vent cabinet |
| GB2550598A (en) * | 2016-05-24 | 2017-11-29 | Bofa International Ltd | Fume extraction |
| CN106077014B (en) * | 2016-06-21 | 2019-07-05 | 安徽东冠器械设备有限公司 | A kind of vent cabinet conducive to exhaust |
| CN108240348B (en) * | 2016-12-25 | 2019-09-17 | 上海梅山钢铁股份有限公司 | Dedusting method for controlling frequency conversion |
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| WO1987002566A1 (en) * | 1985-10-25 | 1987-05-07 | Schulze Karl Frederick Jr | Method/apparatus for monitoring infants on assisted ventilation |
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| CN111014218A (en) * | 2019-11-28 | 2020-04-17 | 同济大学 | Centralized air exhaust system and air exhaust method for multiple rubber vulcanizing machines |
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