CN205401239U - A volute blower for range hood - Google Patents
A volute blower for range hood Download PDFInfo
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- CN205401239U CN205401239U CN201620153561.XU CN201620153561U CN205401239U CN 205401239 U CN205401239 U CN 205401239U CN 201620153561 U CN201620153561 U CN 201620153561U CN 205401239 U CN205401239 U CN 205401239U
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- snail tongue
- cavity
- spiral case
- range hood
- blower
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Abstract
The utility model discloses a volute blower for range hood, including the snail tongue, the snail tongue includes snail tongue inner wall, its characterized in that: snail tongue shape becomes the confined cavity, arranges at least one longitudinal baffle along the axis direction of spiral case in the cavity, has arranged a plurality of radial baffles along the axis direction of perpendicular spiral case, the longitudinal baffle will with radial baffle a plurality of independent confined amortization cavitys are separated into to the cavity, set up porosely in the snail tongue inner wall part that every amortization cavity corresponds. Separate into a plurality of independent confined areolas with the cavity in the snail tongue, the hole shape of from this offering on areola and the lateral wall that corresponds becomes helmholtz resonator, and according to the helmholtz resonance principle, the back of coming is propagated to sound, and the sound wave that is close to with this resonator natural frequency produces resonance with the resonator, and at the vibration in -process, the air column in the cavity consumes acoustic energy with the cavity inner wall friction to carry out sqouynd absorption lowering noise.
Description
Technical field
This utility model relates to a kind of range hood, especially a kind of volute of blower for range hood.
Background technology
Domestic cooking fume remover uses multi-blade centrifugal fan, carries out air-breathing, aerofluxus.Blower fan is generally made up of spiral case, motor, impeller etc..Wherein in spiral case, tongue-shaped projection part is called snail tongue, and its Main Function is to separate flowing gas, it is prevented that gas is at spiral case internal circulation flow.Due to gas pressure height, complex flow near snail tongue, the flow noise produced near snail tongue, rotational noise are the Main Noise Sources of centrifugal blower, reduce the noise near snail tongue and can significantly reduce range hood noise.
For reducing noise, spiral case is carried out certain improvement.A kind of blower fan for range hood as disclosed in Chinese patent that application number is 201310430959.4, including spiral case, snail tongue, coaming plate and volute flange, spiral case includes front and rear panels, snail tongue at least limits silence space jointly with one of header board, back plate, coaming plate and volute flange, snail tongue is formed multiple through hole, utilizes silence space compression air the through-hole wall with snail tongue to occur friction to consume noise energy.
Above-mentioned this spiral case, the cavity of integral type is formed between snail tongue and spiral case miscellaneous part, by changing the propagation path of sound wave and interfering each other and reduce noise, but sound wave probably passes the cavity of this integral type, so that the effect of noise reduction is greatly lowered.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned prior art Problems existing, it is provided that a kind of volute of blower for range hood reducing noise.
The technical scheme that the above-mentioned technical problem of this utility model solution adopts is: a kind of volute of blower for range hood, including snail tongue, described snail tongue includes snail tongue inwall, it is characterized in that: described snail tongue shape becomes the cavity closed, in described cavity, the axis direction along spiral case is provided with at least one longitudinal baffle, axis direction along vertical spiral case is provided with multiple radial direction dividing plate, described cavity is separated into the noise reduction cavity of multiple independent closing by described longitudinal baffle and radially dividing plate, the snail tongue inner wall section that each noise reduction cavity is corresponding is offered porose.
Preferably, for obtaining good noise reduction, and being easy to processing, described hole is elongate holes.
Further, for making the resonant frequency of the resonator of noise reduction cavity and hole composition be in the noise substantial scope of range hood, the length in described hole is a, and width is b, and the degree of depth is t, and 1mm≤b≤4mm, 4≤a/b≤15,0.5≤t/b≤5；Noise reduction cavity volume corresponding to described hole is v, and v/ (a*b*t) >=50.
Preferably, the leakage direction of trend with air-flow for making elongate holes is consistent, and the length direction of described elongate holes is distributed along the axis of vertical spiral case, and the width of described elongate holes is distributed along the axis of spiral case.
Preferably, the generation type of snail tongue is, described snail tongue also includes being formed at the snail tongue outer wall of described spiral case inner wall outside, front bulkhead and aft bulkhead, described snail tongue inwall and snail tongue outer wall lay respectively between described front bulkhead and aft bulkhead, and described snail tongue inwall, snail tongue outer wall, front bulkhead and aft bulkhead limit above-mentioned cavity.
Preferably, for forming the resonator of various different size, the axis that described longitudinal baffle includes multiple and relatively described spiral case is inclined.
Further, for making resonator sqouynd absorption lowering noise in very wide frequency range, described longitudinal baffle includes being connected between described snail tongue inwall and snail tongue outer wall, and it is connected between adjacent longitudinal baffle and snail tongue inwall, so that the shape of cross section of described noise reduction cavity is triangle, tetragon and/or pentagon, in same cross section, each noise reduction cavity size is different.
Compared with prior art, the utility model has the advantage of: the cavity in snail tongue is separated into the areola of multiple independent closing, the hole thus offered on the sidewall of areola and correspondence forms Helmholtz resonator, according to helmholtz resonance principle, after sound transmission comes, the sound wave close with this resonator natural frequency produces resonance with resonator, in vibration processes, air column in cavity and cavity inner wall friction and sound energy consumption, thus carrying out sqouynd absorption lowering noise；Longitudinal baffle is arranged to multiple, inclination and different connected modes, resonator can be made to be built into irregular shape, thus improving the resonance individual features of resonator, expanding resonance frequency range.
Accompanying drawing explanation
Fig. 1 is the structural representation of spiral case of the present utility model；
Fig. 2 is the structural representation of the snail tongue of spiral case of the present utility model；
Fig. 3 is the sectional view of spiral case of the present utility model；
Fig. 4 is the close-up schematic view of the spiral case of Fig. 3；
Fig. 5 is the sectional view of spiral case of the present utility model；
Fig. 6 is the close-up schematic view of the spiral case of Fig. 5.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, this utility model is described in further detail.
Referring to Fig. 1～Fig. 6, a kind of volute of blower for range hood, including front shroud 1, back shroud 2, the middle casing 3 of ring-type that is connected between front shroud 1 and back shroud 2, and snail tongue 4.
Snail tongue 4 includes snail tongue inwall 41, snail tongue outer wall 42, front bulkhead 43 and aft bulkhead 44, snail tongue inwall 41 is identical with the snail tongue of prior art, seamlessly transitting from the end of middle casing 3, relative with the impeller in spiral case, snail tongue outer wall 42 is set up on the basis of the snail tongue of prior art.Snail tongue inwall 41 and snail tongue outer wall 42 lay respectively between front bulkhead 43 and aft bulkhead 44, and snail tongue outer wall 42 forms the outside at snail tongue inwall 41, and snail tongue inwall 41, snail tongue outer wall 42, front bulkhead 43 and aft bulkhead 44 collectively form the cavity of closing.
In above-mentioned cavity, the axis shaft parallel of the impeller being mounted within (axis of the spiral case with) direction along spiral case is provided with at least one longitudinal baffle 45, axis direction along vertical spiral case is provided with multiple radial direction dividing plate 46, longitudinal baffle 45 and the radially common areola that above-mentioned cavity is separated into multiple independent closing of dividing plate 46: noise reduction cavity 471, snail tongue inwall 41 part of each noise reduction cavity 471 correspondence offers porose 472, hole 472 makes noise reduction cavity 471 and spiral case inside connect, hole 472 and noise reduction cavity 471 one_to_one corresponding, quantity is equal.
According to helmholtz resonance principle, corresponding hole 472 collectively constitutes a Helmholtz resonator with independent noise reduction cavity 471, after sound transmission comes, the sound wave close with this resonator natural frequency produces resonance with resonator, in vibration processes, wall friction in air column in hole 472 and hole 472 and sound energy consumption, thus reducing noise.
In the present embodiment, hole 472 is preferably elongated, and structure and technique are simple, excellent noise reduction effect.The length in hole 472 is a, and width is b, and the degree of depth is t, and corresponding noise reduction cavity 471 volume is v.Due in cooking-fume exhauster blower via the gas velocity of snail tongue inwall 41 more than 10m/s, gas along hole 472 width flow time, owing to space is too small, in resonator, gas pressure pulsation scope is little, gas flows through at a high speed on surface and produces high frequency and utter long and high-pitched sounds, and therefore the length direction of elongate holes 472 should along gas flow direction, and namely the width in hole 472 is distributed along the axis of spiral case, the length direction in hole 472 is then distributed along the axis of vertical spiral case, consistent with the direction that gas flows out spiral case.The computing formula of the resonant frequency of resonator isWherein, f is resonant frequency, and c is the velocity of sound in air, and s is the area in hole 472, i.e. s=ab.Owing to the shape of noise reduction cavity 471, volume have multiple, thus producing multiple natural reonant frequency, thus in very wide frequency band range, carry out sqouynd absorption lowering noise.Owing to the noise in range hood is concentrated mainly between 100Hz～1500Hz, particularly in the frequency range of 100Hz～1000Hz, therefore, the resonant frequency of resonator designs within the scope of this.Take extractor hood structure technological parameter into consideration, it is preferred that 1mm≤b≤4mm, 4≤a/b≤15,0.5≤t/b≤5, v/ (a*b*t) >=50.
Owing to the different cross sectional shape of noise reduction cavity 471, volume are different to response frequency and the resonance characteristics of sound wave, thus producing multiple resonant frequency, therefore, in the present embodiment, it is provided with four longitudinal baffles 45 inclined with the axis of spiral case, wherein first, second longitudinal baffle about 45 is connected between snail tongue inwall 41 and snail tongue outer wall 42 with arranging, 3rd longitudinal baffle 45 connects between second longitudinal baffle 45 and snail tongue inwall 41, and the 4th longitudinal baffle 45 is connected between the 3rd longitudinal baffle 45 and snail tongue inwall between 41.Thus so that the shape of cross section of noise reduction cavity 471 can be preferably triangle, tetragon and/or pentagon, in same cross section, each noise reduction cavity 471 size is different, can absorb sound in very wide frequency band range.
Claims (7)
1. the volute of blower for range hood, including snail tongue (4), described snail tongue (4) includes snail tongue inwall (41), it is characterized in that: described snail tongue (4) forms the cavity closed, in described cavity, the axis direction along spiral case is provided with at least one longitudinal baffle (45), axis direction along vertical spiral case is provided with multiple radial direction dividing plate (46), described cavity is separated into the noise reduction cavity (471) of multiple independent closing by described longitudinal baffle (45) and radially dividing plate (46), snail tongue inwall (41) part that each noise reduction cavity (471) is corresponding offers porose (472).
2. the volute of blower for range hood as claimed in claim 1, it is characterised in that: described hole (472) are elongate holes.
3. the volute of blower for range hood as claimed in claim 2, it is characterised in that: the length of described hole (472) is a, and width is b, and the degree of depth is t, and 1mm≤b≤4mm, 4≤a/b≤15,0.5≤t/b≤5；Noise reduction cavity (471) volume of described hole (472) correspondence is v, and v/ (a*b*t) >=50.
4. the volute of blower for range hood as claimed in claim 2, it is characterised in that: the length direction of described elongate holes is distributed along the axis of vertical spiral case, and the width of described elongate holes is distributed along the axis of spiral case.
5. the volute of blower for range hood as according to any one of Claims 1 to 4, it is characterized in that: described snail tongue (4) also includes being formed at snail tongue outer wall (42) in described spiral case inwall (1) outside, front bulkhead (43) and aft bulkhead (44), described snail tongue inwall (41) and snail tongue outer wall (42) lay respectively between described front bulkhead (43) and aft bulkhead (44), and described snail tongue inwall (41), snail tongue outer wall (42), front bulkhead (43) and aft bulkhead (44) limit above-mentioned cavity.
6. the volute of blower for range hood as claimed in claim 5, it is characterised in that: the axis that described longitudinal baffle (45) includes multiple and relatively described spiral case is inclined.
7. the volute of blower for range hood as claimed in claim 6, it is characterized in that: described longitudinal baffle (45) includes being connected between described snail tongue inwall (41) and snail tongue outer wall (42), and it is connected between adjacent longitudinal baffle (45) and snail tongue inwall (41), so that the shape of cross section of described noise reduction cavity (471) is triangle, tetragon and/or pentagon, in same cross section, each noise reduction cavity (471) size is different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620153561.XU CN205401239U (en) | 2016-02-29 | 2016-02-29 | A volute blower for range hood |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620153561.XU CN205401239U (en) | 2016-02-29 | 2016-02-29 | A volute blower for range hood |
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| CN205401239U true CN205401239U (en) | 2016-07-27 |
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| CN201620153561.XU Active CN205401239U (en) | 2016-02-29 | 2016-02-29 | A volute blower for range hood |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105526193A (en) * | 2016-02-29 | 2016-04-27 | 宁波方太厨具有限公司 | Blower volute for extractor hoods |
| CN107143936A (en) * | 2017-06-15 | 2017-09-08 | 美的集团武汉制冷设备有限公司 | Silencer cover and air conditioner |
| WO2023103121A1 (en) * | 2021-12-08 | 2023-06-15 | Tcl空调器(中山)有限公司 | Volute casing, air passage assembly, and air conditioner |
-
2016
- 2016-02-29 CN CN201620153561.XU patent/CN205401239U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105526193A (en) * | 2016-02-29 | 2016-04-27 | 宁波方太厨具有限公司 | Blower volute for extractor hoods |
| CN105526193B (en) * | 2016-02-29 | 2019-02-26 | 宁波方太厨具有限公司 | A kind of volute of blower for range hood |
| CN107143936A (en) * | 2017-06-15 | 2017-09-08 | 美的集团武汉制冷设备有限公司 | Silencer cover and air conditioner |
| WO2023103121A1 (en) * | 2021-12-08 | 2023-06-15 | Tcl空调器(中山)有限公司 | Volute casing, air passage assembly, and air conditioner |
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