CN101476747A - Smoke discharging system with automatic air draft speed regulation function according to smog concentration - Google Patents

Abstract

The invention relates to a fume exhaust system capable of adjusting the air exhausting speed according to the fume concentration, which comprises an air exhausting device and a power supply, and is characterized by further comprising a photoelectric detection unit, a blower rotating speed control unit, wherein the output end of the photoelectric detection unit is connected with the blower rotating speed control unit which is connected with a power supply, and the output end of the blower rotating speed control unit is connected with the air exhausting device simultaneously. The fume exhaust system makes use of the principle that the light absorption by the fume and the reflection effect cause the attenuation of light intensity, adopts a photoelectric detection method to measure the fume concentration, and converts the changes of the fume concentration into electric signals to be output to the blower rotating speed control unit so that the blower rotating speed control unit adjusts the rotating speed of the air exhausting device according to the changes of the fume concentration, thereby achieving the aim of adjusting the air exhausting speed automatically according to the fume concentration. The fume exhaust system has the advantages of electricity conservation and labor conservation, high fume exhausting efficiency, and low cost.

Description

Automatically regulate the smoke evacuation system of air draft speed according to smokescope

Technical field

The present invention relates to a kind of smoke evacuation system, particularly relate to a kind of smoke evacuation system that can regulate air draft speed according to smokescope automatically.

Background technology

Smoke evacuation system can be applied to a lot of occasions, smoke exhaust ventilator such as household kitchen, and the air exhauster of smoking room etc., it mainly is to rotate by blower fan to produce draft, smog, oil smoke etc. are extracted out or eliminating, and generally speaking, the air draft speed of blower fan is fast more, then draft is also just big more, and the elimination factor of smog or oil smoke is just high more.But the technology that the smokescope of the air draft speed of smoke evacuation system and this occasion interrelates is had not yet to see.For example smoke exhaust ventilator generally is provided with several fixedly gears exactly on machine shell panel, regulates the wind speed that smoke exhaust ventilator fan leaf produces manually, thereby changes the draft of smoke exhaust ventilator to oil smoke.Such design has brought some inconvenience to the user, when two hands of user are all occupied, just can not in time switch wind speed, the user carries out limited adjusting according to the impression of subjectivity simultaneously, and employed fixedly wind speed possibly can't be drained smog only when smokescope is big; And smokescope hour employed fixedly wind speed might be excessive and be caused power wastage.In order to reach the purpose of automatic adjusting smoke exhaust ventilator draft, Chinese patent " the full-automatic smoke exhaust ventilator of a kind of magnetic suspension drum-type rotator type (ZL03206223.0) " provides a kind of technical scheme, it is provided with physics receptor and chemocepter, the speed that physics receptor perceive heat air-flow rises promotes the rotation of the floating rotor of magnetic separation, pass the signal along to microcomputer control system, make it open motor switch, a certain amount of if ascending air surpasses, can open the high speed rotating switch; And chemocepter is the gas concentration receptor, to the gas concentration sensitivity, makes its impression and produces electrical signal transfer to microcomputer controller when gas concentration meets or exceeds certain value, opens switch and bleeds.In this scheme, physics receptor impression be the speed of thermal current, the chemocepter impression be gas concentration, rather than the concentration of oil smoke itself, therefore, in the prior art also less than the smoke evacuation system of the draft that automatically adjusts according to smokescope.

Summary of the invention

The purpose of this invention is to provide and a kind ofly can regulate air draft speed automatically according to smokescope, thus the intelligent smoke evacuation system that can regulate draft automatically.

Technical scheme of the present invention is: a kind of smoke evacuation system that can regulate air draft speed according to smokescope automatically comprises photodetector unit, rotation speed of fan control module, exhaust equipment and power supply; The output of photodetector unit is connected with the rotation speed of fan control module, and the rotation speed of fan control module is connected respectively with exhaust equipment with power supply, and wherein the output of rotation speed of fan control module is connected with exhaust equipment.The rotation speed of fan control module receives the detection signal of photodetector unit output, export to the voltage or the current strength of exhaust equipment according to the size adjustment of detection signal, thereby regulate the rotation speed of fan of exhaust equipment, realize the function of regulating air draft speed automatically according to smokescope.

Wherein, photodetector unit comprises light source at least, the amplifying circuit that photodetector and multiplication factor and photodetector are complementary; Certain distance is arranged between light source and the photodetector, form a space, can enter described space from gas, drop, dust, the smog of surrounding environment; The output of photodetector is connected with amplifying circuit, and the output of amplifying circuit is connected with the rotation speed of fan control module.In photodetector unit, the effect of light source is the light radiation that produces certain intensity; The effect of photodetector is to change into the signal of telecommunication by the optical signal from light source that photoelectric effect will receive, and assurance light signal strength and electrical signal intensity relation in direct ratio, in order to make photodetector can accurately receive optical signal from light source, light source should be over against the optical signal receiving plane of photodetector; Amplifying circuit is connected with photodetector, and its effect is to reduce the noise of the signal of telecommunication of photodetector generation and it is amplified certain multiple, to meet the requirement of rotation speed of fan control module received signal.When the light that light source sends arrives the optical signal receiving plane of photodetector by smog, because smog is to the absorption and the reflection of light beam, the intensity of light beam can reduce, smokescope is high more, the signal of telecommunication of photodetector output is weak more, otherwise smokescope is low more, and the signal of telecommunication of photodetector output is strong more.

The light beam that produces at light source and photodetector are on basis consistent on the spectral characteristic, and light source can be selected in the wave spectrum scope of broad, can be visible light, also can be infrared light or ultraviolet light etc.The way of output of light source can be a continous way, also can be the pulse output type.If adopt pulse output, output frequency can not be too low so, exerts an influence otherwise might regulate the speed of exhaust equipment.At present, on the market there be much the model of light source, and light sources such as visible light, infrared light, ultraviolet light all have ripe commodity to have bought, and photodetector also has a lot of corresponding models, as the lithium tantalate Infrared Detectors etc.; With the amplifying circuit of the various models of photodetector coupling ripe commodity are arranged also on market at present.

Exhaust equipment comprises a motor-driven air exhauster at least, and the output of rotation speed of fan control module links to each other with the air exhauster of exhaust equipment.Exhaust equipment can also comprise other servicing units such as air draft pipe.

The rotation speed of fan control module comprises a control circuit at least, makes the running power of described air exhauster and the output valve of photodetection unit keep specific monotone decreasing functional relation.That is to say, the rotating speed that makes air exhauster by the control circuit in the rotation speed of fan control module along with the photodetector unit output valve reduce increase, perhaps reduce along with the increase of photodetector unit output valve, realize the adjusting of air draft speed.

Described monotone decreasing functional relation has number of different types to select, but (form v) is a reasonable selection, and P is the running power of air exhauster in the formula, and v is the output valve of photodetection unit to adopt P=b-af, a and b are positive constant coefficients, and f (v) represents the monotonic increasing function about v; Wherein representational f (functional form v) has: f (v)=and v or f (v)=lnv.The initial value of a and b is determined by the maximum output valve of photodetection unit and the rated power of minimum output valve and air exhauster.The control circuit of realizing above-mentioned monotone decreasing functional relation has multiple solution in the prior art, can be selected according to actual conditions.

For smoke evacuation system user's of the present invention convenience, also comprise manual regulating device in the rotation speed of fan control module, can regulate the curtage intensity that inputs to exhaust equipment as required by the user, thus the air draft speed of manual adjustment smoke evacuation system.

Preferred a kind of mode is that manual regulating device is arranged in the control circuit, described manual regulating device comprises that at least two are regulated device, regulate described monotone decreasing functional relation P=b-af (constant coefficient a v) and the size of b respectively, input to the curtage intensity of exhaust equipment with change, obtain the air draft speed that the user needs.Think that such as the user air draft speed is normal when smokescope is low, but smokescope when big air draft speed on the low side, then can be by suitably turning a down and/or transferring big b to revise; The user thinks that air draft speed is normal when smokescope is big, but smokescope when low air draft speed higher, then can be by suitably transferring big a and/or turning b down and revise; Air draft speed was all on the low side when the user thought that smokescope is no matter low or higher, then can revise by transferring big b; Air draft speed was all higher when the user thought that smokescope is no matter low or higher, then can revise by turning b down.

Be definite method of example explanation constant a and b initial value below with P=b-av and two monotone decreasing functional relations of P=b-alnv:

At first determine two parameter: v _MaxAnd v _Min, they are illustrated respectively in the output valve of output valve that does not have photodetector unit under the situation that smog exists and the photodetector unit under the Cmax smog that may occur.

The regulation and control of air exhauster rotating speed can realize by regulating its input voltage or input current, just be controlled the input voltage or the input current of air exhauster by control circuit.No matter be Current Control or Control of Voltage, exist a quadratic relationship between the input power of they and air exhauster, according to above-mentioned monotone decreasing functional relation, the relation of the output valve v of input current I and input voltage U and photodetection unit as shown in the formula:

I ²=b-av or U ²=b-av

I ²=b-alnv or U ²=b-alnv

If utilize current regulation control air exhauster rotating speed, the rated operational current of air exhauster is I ₀, then set when not having smog to exist, output current I is 0, when Cmax smog is arranged then output current I be rated operational current I ₀, can determine a and b and be:

$a=\frac{{I_0}^2}{v_{\max }-v_{\min }},$ $b=\frac{{I_0}^2{v}_{\max }}{v_{\max }-v_{\min }}$

Or $a=\frac{{I_0}^2}{{\ln v}_{\max }-{\ln v}_{\min }},$ $b=\frac{{I_0}^2{v}_{\max }}{v_{\max }-v_{\min }}$

In like manner, if utilize voltage-regulation control air exhauster rotating speed, the rated operational voltage of air exhauster is U ₀, then setting does not have smog to exist, output voltage U is 0, when Cmax smog is arranged then output voltage be rated operational voltage U ₀, a of mensuration and b are:

$a=\frac{{U_0}^2}{v_{\max }-v_{\min }},$ $b=\frac{{U_0}^2{v}_{\max }}{v_{\max }-v_{\min }}$

Or $a=\frac{{U_0}^2}{{\ln v}_{\max }-{\ln v}_{\min }},$ $b=\frac{{U_0}^2\ln v_{\max }}{{\ln v}_{\max }-{\ln v}_{\min }}$

Therefore, with the monotone decreasing functional relation after a and the b substitution be:

${\mathrm{<figure-callout\; id="2"\; label="I"\; filenames="A200910000607E00121.png"\; state="\{\{state\}\}">I</figure-callout>}}^2={I_0}^2\&CenterDot;\frac{v_{\max }-v}{v_{\max }-v_{\mathrm{<figure-callout\; id="2"\; label="min\; Or\; U"\; filenames="A200910000607E00121.png"\; state="\{\{state\}\}">min</figure-callout>}}}$ Or $U^{}$ ${}^2={U_0}^2\&CenterDot;\frac{v_{\max }-v}{v_{\max }-v_{\min }}$

${\mathrm{<figure-callout\; id="2"\; label="I"\; filenames="A200910000607E00121.png"\; state="\{\{state\}\}">I</figure-callout>}}^2={I_0}^2\&CenterDot;\frac{{\ln v}_{\max }-\ln v}{{\ln v}_{\max }-{\ln v}_{\min }}$ Or ${\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="A200910000607E00121.png"\; state="\{\{state\}\}">U</figure-callout>}}^2={U_0}^2\&CenterDot;\frac{\ln v_{\max }-\ln v}{{\ln v}_{\max }-{\ln v}_{\min }}$

More than be the initial value of a and b, but after adding manual regulating device, can regulate a and b, obtain better result of use according to user's needs.

Smoke evacuation system of the present invention can not take place on the basis of great change in existing smoke evacuation system structure, utilize smog to the absorption of light and reflection effect and cause the principle of light intensity decays, adopt photoelectric detecting method to measure smokescope, and the variation of smokescope is converted to the signal of telecommunication exports to the rotation speed of fan control module, the rotation speed of fan control module is regulated the air draft speed of exhaust equipment according to the variation of smokescope, thereby the purpose that realization is regulated air draft speed automatically according to smokescope, also can add manual regulating device simultaneously, the user can select the manual adjustment air draft speed, has electricity-saving labor-saving, smog is got rid of the efficient height, the advantage that cost is low.

Description of drawings

Fig. 1 is the structural representation of embodiments of the invention 1;

Fig. 2 is the structural representation of embodiments of the invention 2.

The specific embodiment

Embodiment 1

A kind of smoke evacuation system that can regulate wind speed according to smokescope automatically, comprise photodetector unit 1, rotation speed of fan control module 2, exhaust equipment 3 and power supply 4, the output of photodetector unit 1 is connected with rotation speed of fan control module 2, and rotation speed of fan control module 2 is connected with power supply 4 with exhaust equipment 3.

Photodetector unit 1 comprises light source 11, photodetector 12, the amplifying circuit 13 that is complementary with multiplication factor and photodetector 12,12 of light source 11 and photodetectors have a space 5, smog 6 passes this space 5 and arrives exhaust equipment 3, and the light beam A that light source 11 produces is consistent on spectral characteristic with photodetector 12; Photodetector 12 is connected with amplifying circuit 13, the light beam A that light source 11 produces is passed smog 6 and is arrived photodetector 12, photodetector 12 is converted into the signal of telecommunication according to photoelectric effect with luminous intensity, again through the amplification of amplifying circuit 13, obtains the output valve v of photodetector unit 1.

The output of photodetector unit 1 is connected with rotation speed of fan control module 2, and rotation speed of fan control module 2 comprises control circuit 21, and control circuit 21 is connected with the output of amplifying circuit 13 in the photodetector unit 1, also is connected with exhaust equipment 3 simultaneously.

Control circuit 21 is made up of operational amplifier and multistage transistor amplifier, operational amplifier one end is connected with the output of amplifying circuit 13, one utmost point of multistage transistor amplifier links to each other with the operational amplifier other end, the two poles of the earth link to each other with exhaust equipment 3 with power supply 4 respectively in addition, make between the running power P of the output valve v of photodetection unit 1 and exhaust equipment 3 to keep specific monotone decreasing functional relation P=b-av or P=b-alnv.

Exhaust equipment 3 comprises a motor-driven air exhauster 31, and the control of air exhauster 31 can be controlled by the change of input voltage, therefore can be designed to the monotone decreasing functional relation U about voltage in operational amplifier ²=b-av or U ²=b-alnv, wherein a and b are positive constant coefficients.

Air exhauster 31 in the exhaust equipment 3 is connected with the control circuit 21 of rotation speed of fan control module 2, control circuit 21 is according to the output valve of photodetector unit 1, regulate the input voltage of air exhauster 31 by above-mentioned monotone decreasing functional relation, thereby regulate the rotating speed of air exhauster 31, finally reach the effect of regulating wind speed according to smokescope.

Embodiment 2

Embodiment 2 is basic identical with embodiment 1 structure, and difference is to add manual regulating device 22 in rotation speed of fan control module 2, and manual regulating device 22 is arranged in the control circuit 21, is arranged in the operational amplifier of control circuit 21.

Comprise motor-driven air exhauster 31 and air draft pipe 32 in the exhaust equipment 3.

Control circuit 21 is controlled the air draft speed of exhaust equipment 3 according to the output valve v of photodetector unit 1 by the input current of control exhaust equipment 3, so imports the monotone decreasing functional relation I about electric current in operational amplifier ²=b-av or I ²=b-alnv.

Manual regulating device 22 comprises that two are regulated device in control circuit 21, one of them regulates constant coefficient a, and another regulates constant coefficient b, thereby regulates the air draft speed of air exhauster according to user's needs.Think that such as the user air draft speed is normal when smokescope is low, but smokescope when big air draft speed on the low side, then can be by suitably turning a down and/or transferring big b to revise; The user thinks that air draft speed is normal when smokescope is big, but smokescope when low air draft speed higher, then can be by suitably transferring big a and/or turning b down and revise; Air draft speed was all on the low side when the user thought that smokescope is no matter low or higher, then can revise by transferring big b; Air draft speed was all higher when the user thought that smokescope is no matter low or higher, then can revise by turning b down.

Above embodiment is for more detailed description the present invention, but protection scope of the present invention is not limited thereto.

Claims (8)

1. an energy is regulated the smoke evacuation system of air draft speed automatically according to smokescope, comprise exhaust equipment and power supply, it is characterized in that also comprising photodetector unit, the rotation speed of fan control module, the output of photodetector unit is connected with the rotation speed of fan control module, and the rotation speed of fan control module is connected respectively with exhaust equipment with power supply.

2. smoking according to claim 1 system is characterized in that described photodetector unit comprises a light source at least, a photodetector and an amplifying circuit; One space is arranged between light source and the photodetector, can enter described space from gas, drop and dust, the smog of surrounding environment; The output of photodetector is connected with amplifying circuit, and the output of amplifying circuit is connected with the rotation speed of fan control module.

3. smoke evacuation system according to claim 1 and 2 is characterized in that exhaust equipment comprises a motor-driven air exhauster at least.

4. smoke evacuation system according to claim 3 is characterized in that the rotation speed of fan control module comprises a control circuit at least, makes between the output valve of the running power of air exhauster and photodetection unit to keep the monotone decreasing functional relation.

5. smoke evacuation system according to claim 4, it is characterized in that described monotone decreasing functional relation is that (v), wherein P is the running power of air exhauster to P=b-af, and v is the output valve of photodetection unit, a and b are positive constant coefficients, and f (v) represents the monotonic increasing function about v.

6. smoke evacuation system according to claim 5, it is characterized in that f (v) Biao Shi monotonic increasing function be f (v)=v or f (v)=lnv.

7. according to claim 4 or 5 or 6 each described smoke evacuation systems, it is characterized in that at least also comprising in the described blower fan control module a manual adjusting device.

8. smoke evacuation system according to claim 7 is characterized in that described manual regulating device is arranged in control circuit, comprises that at least two are regulated described monotonic functional relationship P=b-af (the adjusting device of constant coefficient a v) and b respectively.

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