CN106032813A - Dual-blade denoising blower fan - Google Patents
Dual-blade denoising blower fan Download PDFInfo
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- CN106032813A CN106032813A CN201510124789.6A CN201510124789A CN106032813A CN 106032813 A CN106032813 A CN 106032813A CN 201510124789 A CN201510124789 A CN 201510124789A CN 106032813 A CN106032813 A CN 106032813A
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- impeller
- denoising
- acoustic element
- snail tongue
- tongue
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Abstract
The invention discloses a dual-blade denoising blower fan comprising a spiral case and a first impeller; a worm tongue is arranged between the spiral case and the air outlet; the air outlet end is connected with a denoising barrel; the 1/2 inner wall, close to the worm tongue, of the denoising barrel is provided with a first denoising member; the rest 1/2 inner wall of the denoising barrel is fixedly provided with a second denoising member; the distance between the highest point of the first denoising member and the denoising barrel inner wall is A; the distance between the highest point of the second denoising member and the denoising barrel inner wall is B, and A>B. The blower fan also comprises a stop flow ring; the first impeller is provided with a leakage flow gap right opposite to the bottom of the stop flow ring. The first denoising member can denoise high db rotation noises formed by fast airflow and the worm tongue; the second denoising member can denoise low db rotation noises; airflow layers of different speeds in the spiral case can be differentially treated, thus ensuring airflow in the air outlet to quietly and stably output.
Description
Technical field
The present invention relates to ventilation installation, specifically refer to a kind of twayblade denoising draught fan.
Background technology
Centrifugal fan is mainly by the first impeller, casing, shaft coupling, axle.First impeller is to produce blast and the main acting parts of transmission energy；Casing is mainly used to introduce gas and discharge gas, the part kinetic energy of gas is become pressure energy simultaneously；Shaft coupling is used for connecting motor and blower fan, transmits moment；Axle installs and fixes the first impeller, by shaft coupling and motor.
Gas between centrifugal fan blade is when the first impeller rotates, obtained kinetic energy (dynamic head) by centrifugal action to discharge from the first impeller periphery, guiding through scroll casing shape casing, it is allowed to ventilation blower output flow, thus form negative pressure at the first impeller central position, outer gas stream is made to flow into continually supplementary, so that blower fan can discharge gas.Motor passes to blower fan the first impeller by axle power, first impeller rotates and energy is passed to air, under the effect rotated, air produces centrifugal force, air prolongs the blade of blower fan the first impeller and spreads to around, now, blower fan the first impeller is the biggest, and the energy that air is accepted is the biggest, and namely the pressure head (blast) of blower fan is the biggest.If cutting little by the first big impeller, not interfering with air quantity, only can reduce blast.
But while being aerated, also can bring serious sound pollution along with producing strong noise to environment.The noise that blower fan produces in the running mainly includes the Gas-solid Coupling noise that aerodynamic noise, mechanical noise and gas and Elastic Solid System interaction produce.Wherein, aerodynamic noise accounts for 45%, and mechanical noise accounts for 30%, and Gas-solid Coupling noise accounts for 25%.Aerodynamic noise mainly includes rotational noise and vortical noise, air power noise in ventilation blower is exactly the result that both are overlapped mutually, when blower fan rotates, rotate the blade path exit on the first impeller, stream pressure vertically all varies widely with air velocity, when the gap of snail tongue Yu blade exit edge part is less, when the blade path of rotation skims at snail tongue, arising that periodic pressure and velocity fluctuation, the produced noise of pulsation is referred to as rotational noise.Rotational noise not only pollutes environment, and also can affect the stability that the first impeller works, and the most how to solve rotational noise particularly important.
Summary of the invention
It is an object of the invention to provide a kind of twayblade denoising draught fan, the Rotation Noise produced when reducing blower fan operating, and then reach protect environment and improve the purpose of blower fan job stability.
The purpose of the present invention is achieved through the following technical solutions:
nullA kind of twayblade denoising draught fan，Including spiral case and the first impeller of being fixed in spiral case、Second impeller，The both sides of described spiral case offer the air inlet of horizontal direction and the air outlet of vertical direction respectively，Described first impeller and the second impeller are crisscross arranged，Snail tongue it is provided with between described spiral case and air outlet，The tip of the tongue of described snail tongue is to the lopsidedness near the first impeller，Connect in described air outlet end thread and have hush pipe，On hush pipe 1/2nd inwall of described snail tongue side, the first acoustic element is being installed，Remaining 1/2nd inwalls of hush pipe are fixed with the second acoustic element，The longitudinal section of described first acoustic element and the second acoustic element is circular arc，And first distance away from hush pipe inwall of the peak of acoustic element be A，The peak of the second acoustic element distance away from hush pipe inwall is B，And meet A ＞ B.During blower fan work, the air speed-raising that air inlet is poured into by the first wheel rotation, it is made quickly to be discharged by air outlet, in the operation process of the first impeller, particularly in the blade path exit rotated on the first impeller, stream pressure vertically all varies widely with air velocity, when the gap of snail tongue Yu blade exit edge part is less, when the blade path rotated skims at snail tongue, arise that periodic pressure and velocity fluctuation, pulsation can produce rotational noise, and rotational noise can be discharged from air outlet with air-flow runner along spiral case, environment around severe contamination blower fan；
When the present invention works, the air that outside is poured into by the first impeller quickly moves the air outlet to blower fan, and the rotational noise that gas shock snail tongue produces simultaneously is discharged by air outlet the most therewith；nullThe Rotation Noise of outwards transmission can be processed by the hush pipe threadeded with air outlet，The air-flow speed of service at the first vane edge close in spiral case is for the air-flow at spiral case inwall，Its speed significantly increases，Therefore on 1/2nd inwalls of hush pipe, it is fixed with the first acoustic element，Remaining 1/2nd inwalls of hush pipe are fixed with the second acoustic element，The longitudinal section of the first acoustic element and the second acoustic element is circular arc，And first distance A away from hush pipe inwall of the peak of acoustic element more than distance B away from hush pipe inwall of the peak of the second acoustic element，Comparatively speaking，The Rotation Noise of the high-decibel that the air-flow of speed produces with snail tongue effect can be eliminated by the first acoustic element that thickness is bigger，And the Rotation Noise of the low decibel that slow air-flow produces with snail tongue effect can be eliminated by less the second acoustic element of thickness，By the differentiation of the airflow layer of friction speed in spiral case is processed，To avoid being polluted environment by the Rotation Noise entrained by air outlet air-flow，Improve the efficiency that noise reduction processes simultaneously，Ensure the quiet output smoothly of the air-flow at air outlet；
Wherein, the present invention is provided with two coaxial impellers, and first impeller and the second impeller staggered fixing, the blade of the i.e. first impeller is between two blades of the second impeller, the first impeller in spiral case and the second impeller rotate that to produce the pressure that air-flow produces along snail tongue be different phase, partial cancellation can be carried out at snail tongue, and then reduce the purpose of noise；In common blower fan, the edge of snail tongue is typically parallel with axis, but the tip of the tongue of snail tongue is obliquely installed by the present invention, and then the air pulse phase shifting being imparted on snail tongue, then reduce the impulsive force on snail tongue, the most also reach to reduce the purpose of blower fan rotational noise.
Further, described first acoustic element and the second acoustic element are sponge, tapetum fibrosum or aluminium silicate wool.As preferably, the first acoustic element and the second acoustic element all use the material that erasure effect is good, i.e. sponge, tapetum fibrosum or aluminium silicate wool, by processing the absorption of Rotation Noise at air outlet, and then reach the quiet output smoothly of the air-flow at fan outlet.
Further, the angle that the described snail tongue the tip of the tongue tilts is 15 ° ~ 35 °.In the range of the angle of inclination of the snail tongue the tip of the tongue is arranged on 15 ° ~ 35 °, the air-flow rotating outflow on first impeller and the second impeller can be applied on snail tongue simultaneously, and then the air pulse phase shifting being imparted on snail tongue, then reduce the impulsive force on snail tongue, the most also reach to reduce the purpose of blower fan rotational noise.
Further, described snail tongue is short tongue, and the distance that snail tongue is away from the first impeller peak is s, and the excircle of the first impeller distance away from spiral case top inwall is S, and meets 0 ＜ s ＜ S.Snail tongue refers to that the junction of centrifugal ventilator volute and gas outlet often has one to be formed by shell wall, " ligule " structure of shape such as tongue, its effect is used to placement part gas at spiral case internal circulation flow, time near the gas flow sweep snail tongue in the first impeller passage exit, the tip of the tongue of snail tongue breaks it into two: major part air-flow has flowed to the outlet of blower fan along passage；Small part air-flow then flows back to spiral case by the gap between snail tongue, the first impeller, rotates with the first impeller and return to, after reaching one week, the shunting that at snail tongue, participation is new in spiral case.Wherein, snail tongue includes flat tongue, short tongue, deep tongue and point tongue, the i.e. corner dimension by being formed between shell wall and the shell wall of air outlet of spiral case body judges, and angle is in the range of 0 ~ 180 °, snail tongue is set to short tongue by the present invention, because its efficiency curve is relatively flat, economic work region is wider, is therefore applicable to the blower fan carrier of stability output；And the distance that snail tongue is away from the first impeller peak is s, the excircle of the first impeller distance away from spiral case top inwall is S, meet 0 ＜ s ＜ S simultaneously, between snail tongue and the first impeller, i.e. form a ventilation gap, ventilation gap width is s, in the first region, impeller passage exit, air-flow can produce stronger pressure fluctuation in ventilation gap, form also the first impeller blade and pass through effective acoustic radiation of frequency and its harmonic wave, when this ventilation gap increases, the axial VELOCITY DISTRIBUTION of air-flow is the most smooth, therefore the amplitude of the pressure fluctuation at snail tongue also can reduce, i.e. reduce Rotation Noise；This ventilation gap can not be excessive simultaneously, and after ventilation gap increases to a certain degree, noise no longer declines, and excessive ventilation gap can make the aeroperformance of blower fan reduce on the contrary, therefore the scope of s is determined in the range of 0 ~ S.
The present invention compared with prior art, has such advantages as and beneficial effect:
1, the Rotation Noise of the high-decibel that the air-flow of speed produces with snail tongue effect can be eliminated by the first acoustic element that in the present invention, thickness is bigger, and the Rotation Noise of the low decibel that slow air-flow produces with snail tongue effect can be eliminated by less the second acoustic element of thickness, by the differentiation of the airflow layer of friction speed in spiral case is processed, to avoid being polluted environment by the Rotation Noise entrained by air outlet air-flow, improve the efficiency that noise reduction processes, it is ensured that the quiet output smoothly of the air-flow at air outlet simultaneously；
2, the present invention the first acoustic element and the second acoustic element all use the material that erasure effect is good, i.e. sponge, tapetum fibrosum or aluminium silicate wool, by processing the absorption of Rotation Noise at air outlet, and then reach the quiet output smoothly of the air-flow at fan outlet；
3, the present invention is in the first region, impeller passage exit, air-flow can produce stronger pressure fluctuation in ventilation gap, first impeller blade is by frequency and effective acoustic radiation of its harmonic wave, when this ventilation gap increases, the axial VELOCITY DISTRIBUTION of air-flow is the most smooth, therefore the amplitude of the pressure fluctuation at snail tongue also can reduce, and i.e. reduces Rotation Noise；.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by the embodiment of the present invention, constitutes the part of the application, is not intended that the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of a kind of one specific embodiment of twayblade denoising draught fan of the present invention；
Fig. 2 is the sectional view of a kind of one specific embodiment of twayblade denoising draught fan of the present invention；
Fig. 3 is the structural representation of one specific embodiment of silencing pot in a kind of twayblade denoising draught fan of the present invention.
Labelling and corresponding parts title in accompanying drawing: 1, spiral case, 2, air inlet, 3, air outlet, the 4, first impeller, 5, snail tongue, 6, hush pipe, the 7, first acoustic element, the 8, second acoustic element, 9, baffle circle, 10, earial drainage gap.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, and the exemplary embodiment of the present invention and explanation thereof are only used for explaining the present invention, not as a limitation of the invention.
Embodiment 1
As shown in Figure 1 to Figure 3, the present embodiment includes spiral case 1 and the first impeller 4 being fixed in spiral case 1, the both sides of described spiral case 1 offer the air inlet 2 of horizontal direction and the air outlet 3 of vertical direction respectively, it is provided with snail tongue 5 between described spiral case 1 and air outlet 3, connect in described air outlet 3 end thread and have hush pipe 6, on hush pipe 1/6th two inwall of described snail tongue 5 side, the first acoustic element 7 is being installed, remaining 1/2nd inwalls of hush pipe 6 are fixed with the second acoustic element 8, the longitudinal section of described first acoustic element 7 and the second acoustic element 8 is circular arc, and first distance away from hush pipe 6 inwall of the peak of acoustic element 7 be A, the peak of the second acoustic element 8 distance away from hush pipe 6 inwall is B, and meet A ＞ B；Also include the baffle circle 9 being fixed on the first impeller 4, the first impeller 4 has earial drainage gap 10, and just lower end to baffle circle 9, described earial drainage gap 10.
When the present invention works, the air that outside is poured into by the first impeller 4 quickly moves the air outlet 3 to blower fan, and the rotational noise that gas shock snail tongue 5 produces simultaneously is discharged by air outlet 3 the most therewith；nullThe Rotation Noise of outwards transmission can be processed by the hush pipe 6 threadeded with air outlet 3，In spiral case 1 near the air-flow speed of service of the first impeller 4 edge for the air-flow at spiral case 1 inwall，Its speed significantly increases，Therefore on 1/2nd inwalls of hush pipe 6, it is fixed with the first acoustic element 7，Remaining 1/2nd inwalls of hush pipe 6 are fixed with the second acoustic element 8，The longitudinal section of the first acoustic element 7 and the second acoustic element 8 is circular arc，And first distance A away from hush pipe 6 inwall of the peak of acoustic element 7 more than distance B away from hush pipe 6 inwall of the peak of the second acoustic element 8，Comparatively speaking，The Rotation Noise of the high-decibel that the air-flow of speed produces with snail tongue 5 effect can be eliminated by the first acoustic element 7 that thickness is bigger，And the Rotation Noise that less the second acoustic element 8 of thickness can act on the low decibel produced to slow air-flow and snail tongue 5 eliminate，By the differentiation of the airflow layer of friction speed in spiral case 1 is processed，To avoid being polluted environment by the Rotation Noise entrained by air outlet 3 air-flow，Improve the efficiency that noise reduction processes simultaneously，Ensure the quiet output smoothly of the air-flow at air outlet 3；
Wherein, the present invention is provided with two coaxial impellers, and first impeller 4 and the second impeller 9 staggered fixing, the blade of the i.e. first impeller 4 is between two blades of the second impeller 9, the first impeller 4 in spiral case 1 and the second impeller rotation 9 pressure that angry stream produces along snail tongue 5 of changing the line of production is different phase, partial cancellation can be carried out at snail tongue 5, and then reduce the purpose of noise；In common blower fan, the edge of snail tongue 5 is typically parallel with axis, but the tip of the tongue of snail tongue 5 is obliquely installed by the present invention, and then the air pulse phase shifting being imparted on snail tongue 5, then reduce the impulsive force on snail tongue 5, the most also reach to reduce the purpose of blower fan rotational noise.
As preferably, the angle that described snail tongue 5 the tip of the tongue tilts is 15 ° ~ 35 °.In the range of the angle of inclination of snail tongue 5 the tip of the tongue is arranged on 15 ° ~ 35 °, the air-flow rotating outflow on first impeller 4 and the second impeller 9 can be applied on snail tongue 5 simultaneously, and then the air pulse phase shifting being imparted on snail tongue 5, then reduce the impulsive force on snail tongue 5, the most also reach to reduce the purpose of blower fan rotational noise.
As preferably, first acoustic element 7 and the second acoustic element 8 all use the material that erasure effect is good, i.e. sponge, tapetum fibrosum or aluminium silicate wool, by processing the absorption of Rotation Noise at air outlet 3, and then reaches the quiet output smoothly of the air-flow at fan outlet 3.
Snail tongue 5 is set to short tongue by the present invention, and because its efficiency curve is relatively flat, economic work region is wider, is therefore applicable to the blower fan carrier of stability output；And the distance that snail tongue 5 is away from the first impeller 4 peak is s, the excircle of the first impeller 4 distance away from spiral case 1 top inwall is S, meet 0 ＜ s ＜ S simultaneously, between snail tongue 5 and the first impeller 4, i.e. form a ventilation gap, ventilation gap width is s, in the first impeller 4 channel exit region, air-flow can produce stronger pressure fluctuation in ventilation gap, form also the first impeller 4 blade passing frequency and effective acoustic radiation of its harmonic wave, when this ventilation gap increases, the axial VELOCITY DISTRIBUTION of air-flow is the most smooth, therefore the amplitude of the pressure fluctuation at snail tongue 5 also can reduce, i.e. reduce Rotation Noise；This ventilation gap can not be excessive simultaneously, and after ventilation gap increases to a certain degree, noise no longer declines, and excessive ventilation gap can make the aeroperformance of blower fan reduce on the contrary, therefore the scope of s is determined in the range of 0 ~ S.
Above-described detailed description of the invention; the purpose of the present invention, technical scheme and beneficial effect are further described; it is it should be understood that; the foregoing is only the detailed description of the invention of the present invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included within the scope of the present invention.
Claims (4)
- null1. a twayblade denoising draught fan，Including spiral case (1) and the first impeller (4) coaxial in being fixed on spiral case (1)、Second impeller (9)，The both sides of described spiral case (1) offer the air inlet (2) of horizontal direction and the air outlet (3) of vertical direction respectively，It is characterized in that: described first impeller (4) is crisscross arranged with the second impeller (9)，Snail tongue (5) it is provided with between described spiral case (1) and air outlet (3)，，The tip of the tongue of described snail tongue (5) is to the lopsidedness near the first impeller (4)，Connect in described air outlet (3) end thread and have hush pipe (6)，On hush pipe (6) 1/2nd inwall of described snail tongue (5) side, the first acoustic element (7) is being installed，Remaining 1/2nd inwalls of hush pipe (6) are fixed with the second acoustic element (8)，Described first acoustic element (7) is circular arc with the longitudinal section of the second acoustic element (8)，And first distance away from hush pipe (6) inwall of the peak of acoustic element (7) be A，The peak of the second acoustic element (8) distance away from hush pipe (6) inwall is B，And meet A ＞ B.
- A kind of twayblade denoising draught fan the most according to claim 1, it is characterised in that: described first acoustic element (7) and the second acoustic element (8) are sponge, tapetum fibrosum or aluminium silicate wool.
- A kind of twayblade denoising draught fan the most according to claim 1, it is characterised in that: the angle that described snail tongue (5) the tip of the tongue tilts is 15 ° ~ 35 °.
- 4. according to a kind of twayblade denoising draught fan described in claim 1 ~ 3 any one, it is characterized in that: described snail tongue (5) is short tongue, and the distance that snail tongue (5) is away from the first impeller (4) peak is s, the excircle of the first impeller (4) distance away from spiral case (1) top inwall is S, and meets 0 ＜ s ＜ S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510124789.6A CN106032813A (en) | 2015-03-21 | 2015-03-21 | Dual-blade denoising blower fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510124789.6A CN106032813A (en) | 2015-03-21 | 2015-03-21 | Dual-blade denoising blower fan |
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| Publication Number | Publication Date |
|---|---|
| CN106032813A true CN106032813A (en) | 2016-10-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510124789.6A Pending CN106032813A (en) | 2015-03-21 | 2015-03-21 | Dual-blade denoising blower fan |
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| CN (1) | CN106032813A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109237714A (en) * | 2018-09-21 | 2019-01-18 | 美的集团武汉制冷设备有限公司 | Air conditioner and its control method and storage medium |
| CN114738317A (en) * | 2022-05-10 | 2022-07-12 | 浙江尚扬通风设备有限公司 | Low-loss impeller assembly for centrifugal fan and fan with same |
-
2015
- 2015-03-21 CN CN201510124789.6A patent/CN106032813A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109237714A (en) * | 2018-09-21 | 2019-01-18 | 美的集团武汉制冷设备有限公司 | Air conditioner and its control method and storage medium |
| CN114738317A (en) * | 2022-05-10 | 2022-07-12 | 浙江尚扬通风设备有限公司 | Low-loss impeller assembly for centrifugal fan and fan with same |
| CN114738317B (en) * | 2022-05-10 | 2024-03-26 | 浙江尚扬通风设备有限公司 | Impeller assembly for low-loss centrifugal fan and fan with impeller assembly |
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