CN2498518Y - Silenced separated cooker hood - Google Patents

Abstract

Disclosed is a silencing split-type oil fume absorber, which adds a reactive muffling device inside a split-type oil fume absorber and comprises an anechoic chamber in an oil fume-absorption cover arranged in a room and a muffler arranged inside an oil fume pipeline. The utility model enables the generated airflow noise to be effectively reduced and makes the working noise of the oil fume absorber reach ultra-quiet noise level.

Description

Noise elimination formula split range hood

The utility model relates to a kind of noise elimination formula split range hood, belongs to the range hood technical field.

In the prior art, noise is bigger during range hood work, and its noise is mainly derived from blower fan work time mechanical noise that produces and pneumatic noise.In view of this, Chinese patent CN2415288Y etc. provides a kind of blower fan has partly been moved to outdoor split type range hood, has reduced room noise, but this structure does not have positive effect to reducing pneumatic noise, and the indoor air flow noise is still bigger during its work.

The utility model aims to provide a kind of noise elimination formula split range hood, the room noise in the time of effectively reducing work.

Inventive concept of the present utility model is to install reactive muffler additional in split type range hood, further reduces noise by reducing pneumatic noise.

We know that according to the difference of noise-cancelling theory, silencer can be divided into: dissipative muffler, reactive muffler and resistance silencer.Wherein resistive and resistance silencer all is equipped with sound-absorbing material in it, and absorbs acoustic energy by its, in the range hood environmental limitations of high temperature, heavy wool cigarette its application.And reactive muffler does not directly absorb acoustic energy, its noise-cancelling theory is the unexpected expansion (or contraction) by pipeline section, make along some CF of pipe transmmision or the noise of frequency range, reflect back and propagate no longer forward to sound source, thereby reach the purpose of noise elimination in sudden change place.Reactive muffler has expansion chamber and resonant two kinds.Expansion chambers is the combination of pipe and chamber, and cell couples together with pipe.Citation form as shown in Figure 2, each the band pipe cell be a mesh of acoustic filter.Wherein indoor cross section can be circular, also can be square or rectangular.

Air quality is equivalent to inductance in pipe, and volume of air is equivalent to electric capacity in the cell.Different pipes and chamber combination can filter the noise of some frequency.The sound deadening capacity of single chamber expansion chambers silencer, can calculate by following formula: $\mathrm{\&Delta;L}=10\log [1+1/4{(m-\frac{1}{2})}^2{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="Y0123795900112.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2\mathrm{kl}]\left(\mathrm{dB}\right)---(1-1)$ Wherein: $m=\frac{S_2}{S_1}-$ Divergence ratio is the section ratio of chamber and pipe $k=\frac{2\mathrm{\&pi;}}{\mathrm{\&lambda;}}-$ Wave number (1/m) l---expansion chambers length (m)

According to above formula, the frequency of noise elimination feature of expansion chamber silencer is a sinusoidal waveform, and wherein divergence ratio has determined sound deadening capacity, and expansion chambers length has determined the frequency of noise elimination characteristic.The frequency of sound deadening capacity maximum is: $f_{\mathrm{\&Delta;L}=\max }=\frac{(2n+1)c}{4l}\left(\mathrm{Hz}\right)---(1-2)$ Sound deadening capacity is zero, and promptly noise by frequency is: $f_{\mathrm{\&Delta;L}=0}=\frac{\mathrm{nc}}{2l}\left(\mathrm{Hz}\right)-----(1-3)$

In the formula: n=0,1,2,3

C=THE VELOCITY OF SOUND IN AIR (340m/s under the normal temperature)

The citation form of resonator muffler as shown in Figure 3.Its noise-cancelling theory is to carry out when the pipeline of sound wave from section S, if the dimension (being length) of resonance control is compared enough hour with wave length of sound, then under the effect of sound wave, air in resonant cavity resembles a stiff piston back and forth movement, air in the resonant cavity is compressed with sparse and also vibrates, and has played the noise elimination effect.The eigentone f of resonant cavity _rBe to determine by the volume V of resonant cavity, the conductivity G of aperture area. $f_r=\frac{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="Y0123795900112.png"\; state="\{\{state\}\}">c</figure-callout>}}{2\mathrm{\&pi;}}\sqrt{\frac{G}{V}}\left(\mathrm{Hz}\right)---(1-4)$ The thick t of conductivity G and hole wall in the formula, the diameter d in hole, and the number in hole is relevant: $G=\frac{n{\mathrm{\&pi;<figure-callout\; id="2"\; label="d"\; filenames="Y0123795900112.png"\; state="\{\{state\}\}">d</figure-callout>}}^2}{4(t+0.8d)}-----(1-5)$ The sound deadening capacity of resonator muffler can be calculated as follows: $\mathrm{\&Delta;L}=10\log [1+\frac{\sqrt{\mathrm{GV}}/2S}{\frac{f}{f_r}-\frac{f_r}{f}}{)}^2]\left(\mathrm{dB}\right)------(1-6)$

Specifically, the utility model comprises the lampblack-sucking cover that is installed on indoor kitchen range top, be installed on outdoor be built-in with motor and by driving fan housing, connect the tube connector as the oil smoke passage of lampblack-sucking cover and outdoor housing, the discharge pipe of the end emptying that oil smoke is discharged in the outdoor housing, be installed on relevant controlling switch on the lampblack-sucking cover etc., above-mentioned lampblack-sucking cover, tube connector, outdoor housing and discharge pipe have connected and composed a complete oil smoke passage in turn, it is characterized in that: in the described oil smoke passage reactive muffler is housed.

Described reactive muffler can be installed on each position in the oil smoke passage: in the lampblack-sucking cover, in the tube connector, in the outdoor housing, in the exhaust duct, also can use simultaneously at a plurality of positions in the oil smoke passage.

In conjunction with the concrete geomery of lampblack-sucking cover, adopt anti-formula acoustic wave filter structure in the lampblack-sucking cover.Its concrete structure is: the lower horizontal in lampblack-sucking cover is provided with the base plate that has circular air inlet, form a cavity between the top board of this base plate and lampblack-sucking cover, also has a dividing plate in the described cavity, its size is slightly larger than tube connector, and be positioned at the tube connector aperture position under, with the distance of top board greater than 5cm.

In conjunction with size, the shape of tube connector and exhaust duct, and consider the convenience that structural design is convenient and make, the oil extraction smoke pipe comprises the expansion chamber silencer that can include following structure in tube connector and the exhaust duct:

1, the expansion chamber silencer of citation form, promptly oil-smoke expulsion pipe contains one group or the multi units tube one Room combining structure that is linked in sequence.Consider that should reduce fluid turbulence produces, the cross section of pipe, chamber is preferably circle, consider and to reduce the pressure loss that silencer is imported and exported, should adopt increaser and reducing pipe structure simultaneously respectively at the import and export place, it contracts, expansion ratio (ratio that refers to maximum caliber and minimum pipe) should be not less than 4, the inclined angle alpha of convergent-divergent should preferably adopt the circular curve transition between 45 °～75 °.

2, become the expansion chamber silencer of example:

2.1, can adopt the expansion chambers silencer of interpolation pipe in order to eliminate the noise to more frequency, promptly to import and export pipe and be inserted in the anechoic room inner chamber, the import and export pipe is inserted and is uneven in length deeply.To eliminate the noise by frequency in order limiting, can take to install additional dividing plate in anechoic room, anechoic room is divided into two or more noise elimination cells, the intubate that connects both sides noise elimination cell is arranged on each dividing plate, the length of noise elimination cell is calculated according to frequency of noise elimination and is obtained.

2.2 convenient for structural design certainly and make convenience, the intubate that multicell is cut apart on the dividing plate can be reduced to loose structure.Under the prerequisite that does not influence hydrodynamic performance, make and form the more interference sound wave of multiple row in the noise elimination cell.

2.3 certainly, technique scheme can make up and be applied in the utility model, as following technical scheme be: reach the expansion chamber silencer that includes citation form in the exhaust duct in the tube connector, it is levied and is: also be provided with one or more demarcation strips that evenly have some apertures on it in this silencer, the diameter ratio value scope at the minimum place of the diameter of described aperture and inlet tube is 1～1.2.

Above-mentioned all silencers both can be separately made and had been connected in series in the seed oil cigarette channel, also can organically combine to one with the oil extraction smoke pipe, as clocklike changing by pipe diameter, made tube connector serve as the expansion chamber silencer again in mist extractor.

Also can adopt the resonator muffler structure in the oil extraction smoke pipe of the present utility model.

Concrete technical scheme is: described fume pipeline has airtight resonant cavity outward, and this resonant cavity contains section of tubing within it, has some apertures on the duct wall that is contained section by resonant cavity.

Can be provided with a plurality of demarcation strips equally in the above-mentioned resonant cavity, resonant cavity is separated into the resonance cell of a plurality of generation different resonant frequencies, its noise elimination better effects if then.

Pneumatic noise when above-mentioned multiple technologies scheme all can reduce the work of oil suction cigarette, thus the room noise of reduction smoke exhaust ventilator also has tangible noise reduction to outdoor noise simultaneously.Test result shows: the room noise during the utility model work is less than 50 decibels.

Below with reference to drawings and Examples the utility model is further described.

Accompanying drawing 1 is a structural representation of the present utility model.

Accompanying drawing 2 is the citation form schematic diagram of expansion chamber silencer.

Accompanying drawing 3 is the citation form schematic diagram of resonator muffler.

Accompanying drawing 4 is an embodiment who adopts acoustic wave filter structure in lampblack-sucking cover of the present utility model, the structural representation of its lampblack-sucking cover.

Accompanying drawing 5～10 is respectively the utility model adopts the different structure silencer in pipeline a plurality of embodiment, the structural representation of its pipe section.

Referring to accompanying drawing 1,4, the utility model embodiment comprises with screw 6 and is installed on lampblack-sucking cover 1 on the body of wall 7 of indoor kitchen range top, be installed on silencer 4 on the outdoor body of wall, be built-in with motor and by the housing 5 of fan of driving, the tube connector 3 that connects lampblack-sucking cover 1 and outdoor housing as the oil smoke passage, the discharge pipe 8 of the end emptying that oil smoke is discharged in the outdoor housing, be installed on relevant controlling switch on the lampblack-sucking cover etc., above-mentioned lampblack-sucking cover 1, tube connector 3, silencer 4, outdoor housing 5 and discharge pipe 8 have connected and composed a complete oil smoke passage in turn.Lower horizontal in above-mentioned lampblack-sucking cover is provided with the base plate 11 that has circular air inlet 10, form a cavity 2 between the top board of this base plate and lampblack-sucking cover, also has a dividing plate 9 in the described cavity, its size is slightly larger than tube connector, and be positioned at the tube connector aperture position under, with the distance of top board be 8cm.

Referring to accompanying drawing 5, the oil-smoke expulsion pipe of this embodiment contains the multi units tube one Room combining structure that is linked in sequence.Pipe 12, the cross section of chamber 13 be circle, and its import and export place should adopt flaring, reducing pipe structure simultaneously respectively, and its expansion, the ratio that contracts (ratio that refers to maximum caliber and minimum pipe) are 5, and the inclined angle alpha of convergent-divergent section is 55 °.

Referring to accompanying drawing 6, the oil-smoke expulsion pipe of this embodiment contains one and becomes routine expansion chamber silencer: add dividing plate 14 in the anechoic room, anechoic room is divided into two noise elimination cells, the intubate 15 that connects both sides noise elimination cell is arranged on this dividing plate.

Referring to accompanying drawing 7, include the expansion chamber silencer of citation form in the exhaust duct of this embodiment, also be provided with the demarcation strip that evenly has some apertures on it in this silencer, the diameter ratio at the minimum place of the diameter of described aperture and inlet tube is 1.1.

Referring to accompanying drawing 8, the oil-smoke expulsion pipe of this embodiment contains the resonator muffler structure.Its fume pipeline has airtight resonant cavity 15 outward, and this resonant cavity contains the part tube connector within it, is contained on the segment pipe wall by resonant cavity at pipeline to have several apertures 16.

Referring to accompanying drawing 9, be provided with demarcation strip 17 equally in the resonant cavity of the resonator muffler in the oil-smoke expulsion pipe of this embodiment, resonant cavity is separated into two resonance cells that produce different resonant frequencies, its noise elimination is effective.

Referring to accompanying drawing 10, big-little-big-little cyclically-varying that the tube connector caliber of this embodiment is clocklike, the bigger part of diameter is as the expansion chambers 18 of expanding silencer.

Certainly, above-mentioned all silencers both can be separately made and had been serially connected with in the oil smoke passage, also can organically combine with the oil extraction smoke pipe to be one.

Claims (10)

1, a kind of noise elimination formula split range hood, comprise: the lampblack-sucking cover that is installed on indoor kitchen range top, be installed on outdoor be built-in with motor and by driving fan housing, connect the tube connector as the oil smoke passage of lampblack-sucking cover and outdoor housing, the discharge pipe of the end emptying that oil smoke is discharged in the outdoor housing, be installed on relevant controlling switch on the lampblack-sucking cover etc., above-mentioned lampblack-sucking cover, tube connector, outdoor housing and discharge pipe have connected and composed a complete oil smoke passage in turn, it is characterized in that: in the described oil smoke passage reactive muffler is housed.

2, noise elimination formula split range hood according to claim 1, it is characterized in that: the lower horizontal in described lampblack-sucking cover is provided with the base plate that has circular air inlet, form a cavity between the top board of this base plate and lampblack-sucking cover, also has a dividing plate in the described cavity, its size is slightly larger than tube connector, and be positioned at the tube connector aperture position under, with the distance of top board greater than 5cm.

3, noise elimination formula split range hood according to claim 1 is characterized in that: the oil extraction smoke pipe of described range hood comprises and includes the expansion chamber silencer in tube connector and the exhaust duct.

4, noise elimination formula split range hood according to claim 3, it is characterized in that: the import and export of described expansion chamber silencer is respectively increaser, reducing pipe simultaneously, and its reducing and expansion ratio is not less than 4, and the inclination angle of convergent-divergent section is between 45 °～75 °.

5, noise elimination formula split range hood according to claim 4, it is characterized in that: also be provided with one or more demarcation strips that evenly have some apertures on it in the outer silencer of described expansion chambers, the diameter of described aperture is 1～1.2 with the minimum diameter ratio value scope of locating of inlet tube.

6, according to claim 2 or 3 arbitrary described noise elimination formula split range hoods, it is characterized in that: the caliber of described tube connector or exhaust duct is clocklike big-little-big-little cyclically-varying, and the bigger part of diameter is as the expansion chambers of expanding silencer.

7, noise elimination formula split range hood according to claim 1 is characterized in that: the oil extraction smoke pipe of described range hood comprises and includes the resonator muffler structure in tube connector and the exhaust duct.

8, noise elimination formula split range hood according to claim 7, it is characterized in that: described fume pipeline has airtight resonant cavity outward, and this resonant cavity contains section of tubing within it, has some apertures on the duct wall that is contained section by resonant cavity.

9, noise elimination formula split range hood according to claim 8 is characterized in that: be provided with a plurality of demarcation strips in the described resonant cavity resonant cavity is separated into a plurality of resonance cells.

10, noise elimination formula split range hood according to claim 2 is characterized in that: the oil extraction smoke pipe of this range hood comprises and includes expansion chamber silencer or resonator muffler in tube connector and the exhaust duct.

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