CN204664004U - A kind of fast noise reduction blower fan - Google Patents
A kind of fast noise reduction blower fan Download PDFInfo
- Publication number
- CN204664004U CN204664004U CN201520164096.5U CN201520164096U CN204664004U CN 204664004 U CN204664004 U CN 204664004U CN 201520164096 U CN201520164096 U CN 201520164096U CN 204664004 U CN204664004 U CN 204664004U
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- noise reduction
- impeller
- tongue
- snail tongue
- spiral case
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Abstract
The utility model discloses: a kind of fast noise reduction blower fan, comprise spiral case and impeller, the second impeller, impeller and the second impeller are crisscross arranged, snail tongue is provided with between spiral case and air outlet, the tip of the tongue of snail tongue is to the lopsidedness near impeller, hush pipe is connected with in air outlet end thread, hush pipe 1/2nd inwall near snail tongue side is provided with the first noise reduction part, remaining 1/2nd inwalls of hush pipe are fixed with the second noise reduction part, the peak of the first noise reduction part is A apart from the distance of hush pipe inwall, the peak of the second noise reduction part is B apart from the distance of hush pipe inwall, and meet A > B. in the utility model, the first noise reduction part can be eliminated the Rotation Noise of the high-decibel that the air-flow of speed and the effect of snail tongue produce, the second noise reduction part can be eliminated the Rotation Noise of low decibel, by the differentiating and processing of the airflow layer to friction speed in spiral case, ensure that the air-flow at air outlet place is quiet and export stably.
Description
Technical field
The utility model relates to ventilation equipment, specifically refers to a kind of fast noise reduction blower fan.
Background technology
Centrifugal fan is primarily of impeller, casing, shaft coupling, axle. Impeller is the main acting parts that produce blast and transferring energy; Casing is mainly used to introduce gas and Exhaust Gas, the part kinetic energy of gas is become to pressure energy simultaneously; Shaft coupling is used for connecting motor and blower fan, carry-over moment; Impeller is installed and fixed to axle, by shaft coupling and motor.
Gas between centrifugal fan blade is when vane rotary, be subject to centrifugal action acquisition kinetic energy (dynamic head) to discharge from impeller periphery, through the guiding of scroll casing shape casing, make it to ventilation blower output flow, thus form negative pressure at impeller central position, outer gas stream is flowed into continually supplementary, thus make blower fan energy Exhaust Gas. Motor is passed to draught fan impeller by axle power, vane rotary is given air energy transferring, under the effect of rotation, air produces centrifugal force, the blade that air prolongs draught fan impeller spreads towards periphery, now, draught fan impeller is larger, and the energy that air accepts is larger, and namely the pressure head of blower fan (blast) is larger. If large impeller is cut little, air quantity can not be affected, only blast can be reduced.
Produce strong noise but also can be accompanied by ventilating, bring serious noise pollution to environment. The noise that blower fan produces in the running mainly comprises 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 comprises rotational noise and vortical noise, air power noise in ventilation blower is exactly the result that both superpose mutually, when blower fan rotates, blade path exit on rotary blade, stream pressure and air velocity vertically all vary widely, when the gap of snail tongue and blade exit edge part is less, when the blade path of rotation skims over snail tongue place, just there will be periodic pressure and velocity fluctuation, the noise that pulsation produces is called as rotational noise. Rotational noise is contaminated environment not only, and the stability of impeller work can be affected, and therefore how to solve rotational noise very important.
Utility model content
The purpose of this utility model is to provide a kind of fast noise reduction blower fan, the Rotation Noise producing when reducing blower fan running, and then reaches protection of the environment and improve the object of blower fan job stability.
The purpose of this utility model is achieved through the following technical solutions:
A kind of fast noise reduction blower fan, the impeller that comprises spiral case and be fixed in spiral case, the both sides of described spiral case offer respectively the air inlet of horizontal direction and the air outlet of vertical direction, snail tongue is provided with between described spiral case and air outlet, the tip of the tongue of described snail tongue is to the lopsidedness near impeller,, spiral case inwall is fixed with noise reduction part by adhesive-layer, and on the upper surface of described noise reduction part, has the sound-absorbing blind hole that multiple longitudinal sections that are arranged side by side are 3/4ths circles. during blower fan work, the air speed-raising that air inlet is poured into by wheel rotation, it is discharged by air outlet place fast, in the operation process of impeller, the particularly blade path exit on rotary blade, stream pressure and air velocity vertically all vary widely, when the gap of snail tongue and blade exit edge part is less, when the blade path of rotation skims over snail tongue place, just there will be periodic pressure and velocity fluctuation, pulsation can produce rotational noise, and rotational noise can be discharged along the runner in spiral case from air outlet with air-flow, severe contamination the environment around blower fan,
During utility model works, the air that pour into by impeller outside moves to the air outlet of blower fan fast, the rotational noise that the snail of gas shock simultaneously tongue produces also is discharged by air outlet thereupon, the inwall of spiral case be attached to noise reduction part by adhesive-layer, described noise reduction part adopts special sound-absorbing material to make, to the Rotation Noise producing, adsorption treatment can be carried out, and on the upper surface of noise reduction part, offer multiple noise reduction blind holes that are arranged side by side, the longitudinal section of described noise reduction blind hole is 3/4ths circles, Rotation Noise is in the process of transmitting, can with air-flow constantly revolution in spiral case, also have a large amount of noises to stop in noise reduction blind hole simultaneously, by the continuous absorption of 3/4ths spherical blind holes to noise, and with respect to the noise reduction part upper surface of plane, the time that air-flow stops in noise reduction blind hole is longer, its erasure effect reaching is also better, the tip of the tongue of snail tongue tilts towards the direction near impeller by the utility model simultaneously, and then the air pulse phase place acting on the snail tongue the tip of the tongue is staggered mutually, reaches the impulsive force reducing on snail tongue, the object that reduces Rotation Noise.
Further, described noise reduction part is sponge, tapetum fibrosum or aluminium silicate wool. As preferably, the material that the first noise reduction part and the second noise reduction part all adopt erasure effect good, i.e. sponge, tapetum fibrosum or aluminium silicate wool, by the absorption processing to Rotation Noise at air outlet place, and then reaches that the air-flow at fan outlet place is quiet to be exported stably.
Further, the angle of inclination of the described snail tongue the tip of the tongue is 15 ° ~ 35 °. The angle of inclination of the snail tongue the tip of the tongue is arranged within the scope of 15 ° ~ 35 °, make to be applied on snail tongue by air-flow out in impeller simultaneously, namely the impulsive force that two strands of air-flows that achieve to be applied on the snail tongue the tip of the tongue produce reduces, and improves the elimination efficiency of Rotation Noise further.
Further, described snail tongue is short tongue, and snail tongue is s apart from the distance of impeller peak, and the excircle of impeller is S apart from the distance of spiral case top inwall, 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, shape " ligule " structure as tongue, its effect is at spiral case internal circulation flow for placement part gas, near the gas flow sweep snail tongue in impeller passage exit time, the tip of the tongue of snail tongue breaks it into two: most of air-flow has flowed to the outlet of blower fan along passage, small part air-flow is then flowed back to spiral case by the gap between snail tongue, impeller, returns to snail tongue place participate in new shunting in spiral case with vane rotary after reaching one week. wherein, snail tongue comprises flat tongue, short tongue, dark tongue and sharp tongue, namely the corner dimension by forming between the shell wall of spiral case body and the shell wall of air outlet judges, and angle is within the scope of 0 ~ 180 °, snail tongue is set to short tongue by the utility model, because its efficiency curve is comparatively smooth, economic work region is wider, is therefore applicable to the blower fan carrier that stability exports, and snail tongue is s apart from the distance of impeller peak, the excircle of impeller is S apart from the distance of spiral case top inwall, meet 0 < s < S simultaneously, namely a ventilation gap between snail tongue and impeller, is formed, ventilation gap width is s, in region, impeller passage exit, air-flow can produce stronger pressure fluctuation in ventilation gap, form also impeller blade by effective acoustic radiation of frequency and its harmonic wave, when this ventilation gap increases, air stream axle to VELOCITY DISTRIBUTION comparatively level and smooth, therefore the amplitude of the pressure fluctuation at snail tongue place also can reduce, namely Rotation Noise is reduce, 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 within the scope of 0 ~ S.
The utility model compared with prior art, has following advantage and beneficial effect:
1, the utility model offers multiple noise reduction blind holes that are arranged side by side on the upper surface of noise reduction part, the longitudinal section of described noise reduction blind hole is 3/4ths circles, Rotation Noise is in the process of transmitting, can with air-flow constantly revolution in spiral case, also have a large amount of noises to stop in noise reduction blind hole simultaneously, by the continuous absorption of 3/4ths spherical blind holes to noise, and with respect to the noise reduction part upper surface of plane, the time that air-flow stops in noise reduction blind hole is longer, and its erasure effect reaching is also better; The tip of the tongue of snail tongue tilts towards the direction near impeller by the utility model simultaneously, and then the air pulse phase place acting on the snail tongue the tip of the tongue is staggered mutually, reaches the impulsive force reducing on snail tongue, the object that reduces Rotation Noise;
2, the angle of inclination of the snail tongue the tip of the tongue is arranged within the scope of 15 ° ~ 35 ° by the utility model, make to be applied on snail tongue by air-flow out in impeller simultaneously, namely the impulsive force that two strands of air-flows that achieve to be applied on the snail tongue the tip of the tongue produce reduces, and improves the elimination efficiency of Rotation Noise further;
3, the utility model is in region, impeller passage exit, air-flow can produce stronger pressure fluctuation in ventilation gap, impeller blade is by effective acoustic radiation of frequency and its harmonic wave, when this ventilation gap increases, air stream axle to VELOCITY DISTRIBUTION comparatively level and smooth, therefore the amplitude of the pressure fluctuation at snail tongue place also can reduce, and namely reduces Rotation Noise; .
Accompanying drawing explanation
Accompanying drawing described herein is used to provide the further understanding to the utility model embodiment, forms the application's a part, does not form the restriction to the utility model embodiment. In the accompanying drawings:
Fig. 1 is the structural representation of a kind of fast noise reduction blower fan described in the utility model specific embodiment;
Fig. 2 is the sectional view of a kind of fast noise reduction blower fan described in the utility model specific embodiment;
Fig. 3 is the structural representation of a noise reduction part specific embodiment in a kind of fast noise reduction blower fan described in the utility model.
Mark and corresponding parts title in accompanying drawing: 1, spiral case, 2, air inlet, 3, air outlet, 4, impeller, 5, snail tongue, 6, adhesive-layer, 7, sound-absorbing blind hole, 8, noise reduction part.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, exemplary embodiment of the present utility model and explanation thereof are only for explaining the utility model, and negative actions is to restriction of the present utility model.
Embodiment 1
As shown in Figure 1 to Figure 3, the impeller 4 that the present embodiment comprises spiral case 1 and is fixed in spiral case 1, the both sides of described spiral case 1 offer respectively the air inlet 2 of horizontal direction and the air outlet 3 of vertical direction, snail tongue 5 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 impeller 4, spiral case 1 inwall is fixed with noise reduction part 8 by adhesive-layer 6, and on the upper surface of described noise reduction part 8, has the sound-absorbing blind hole 7 that multiple longitudinal sections that are arranged side by side are 3/4ths circles. during blower fan work, impeller 4 rotates the air speed-raising that air inlet 2 place is poured into, it is discharged by air outlet 3 place fast, in the operation process of impeller 4, the particularly blade path exit on rotary blade 4, stream pressure and air velocity vertically all vary widely, when the gap of snail tongue 5 and blade exit edge part is less, when the blade path of rotation skims over snail tongue 5 place, just there will be periodic pressure and velocity fluctuation, pulsation can produce rotational noise, and rotational noise can be discharged along the runner in spiral case 1 from air outlet 3 with air-flow, severe contamination the environment around blower fan,
During utility model works, the air that pour into by impeller 4 outside moves to the air outlet 3 of blower fan fast, the rotational noise that the snail of gas shock simultaneously tongue 5 produces also is discharged by air outlet 3 thereupon, the inwall of spiral case 1 be attached to noise reduction part 8 by adhesive-layer 6, described noise reduction part 8 adopts special sound-absorbing material to make, to the Rotation Noise producing, adsorption treatment can be carried out, and on the upper surface of noise reduction part 8, offer multiple noise reduction blind holes 7 that are arranged side by side, the longitudinal section of described noise reduction blind hole 7 is 3/4ths circles, Rotation Noise is in the process of transmitting, can with air-flow in the interior continuous revolution of spiral case 1, also a large amount of noises is had in the interior stop of noise reduction blind hole 7 simultaneously, by the continuous absorption of 3/4ths spherical blind holes to noise, and with respect to noise reduction part 8 upper surface of plane, air-flow is longer in the time of the interior stop of noise reduction blind hole 7, its erasure effect reaching is also better, the tip of the tongue of snail tongue 5 tilts towards the direction near impeller 4 by the utility model simultaneously, and then the air pulse phase place acting on snail tongue 5 the tip of the tongue is staggered mutually, reach the impulsive force reducing on snail tongue 5, the object that reduces Rotation Noise, to avoid the Rotation Noise contaminated environment entrained by air outlet 3 place's air-flow, improve the efficiency of noise reduction processing simultaneously, ensure that the air-flow at air outlet 3 place is quiet and export stably.
As preferably, the material that noise reduction part 8 adopts erasure effect good, i.e. sponge, tapetum fibrosum or aluminium silicate wool, by the absorption processing to Rotation Noise at air outlet 3 place, and then reach that the air-flow at fan outlet 3 place is quiet to be exported stably.
As preferably, the angle of inclination of described snail tongue 5 the tip of the tongue is 15 ° ~ 35 °. The angle of inclination of snail tongue 5 the tip of the tongue is arranged within the scope of 15 ° ~ 35 °, make to be applied on snail tongue 5 by air-flow out in impeller 4 simultaneously, namely the impulsive force that two strands of air-flows that achieve to be applied on snail tongue 5 the tip of the tongue produce reduces, and improves the elimination efficiency of Rotation Noise further.
Snail tongue 5 is set to short tongue by the utility model, and because its efficiency curve is comparatively smooth, economic work region is wider, is therefore applicable to the blower fan carrier that stability exports, and snail tongue 5 is s apart from the distance of impeller 4 peak, the excircle of impeller 4 is S apart from the distance of spiral case 1 top inwall, meet 0 < s < S simultaneously, namely a ventilation gap between snail tongue 5 and impeller 4, is formed, ventilation gap width is s, in impeller 4 channel exit region, air-flow can produce stronger pressure fluctuation in ventilation gap, form also effective acoustic radiation of impeller 4 blade passing frequency and its harmonic wave, when this ventilation gap increases, air stream axle to VELOCITY DISTRIBUTION comparatively level and smooth, therefore the amplitude of the pressure fluctuation at snail tongue 5 place also can reduce, namely Rotation Noise is reduce, 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 within the scope of 0 ~ S.
Above-described detailed description of the invention; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only detailed description of the invention of the present utility model; and be not used in limit protection domain of the present utility model; all within spirit of the present utility model and principle, any amendment of making, be equal to replacement, improvement etc., within protection domain of the present utility model all should be included in.
Claims (4)
1. a fast noise reduction blower fan, the impeller (4) that comprises spiral case (1) and be fixed in spiral case (1), the both sides of described spiral case (1) offer respectively the air inlet (2) of horizontal direction and the air outlet (3) of vertical direction, it is characterized in that: between described spiral case (1) and air outlet (3), be provided with snail tongue (5), the tip of the tongue of described snail tongue (5) is to the lopsidedness near impeller (4), spiral case (1) inwall is fixed with noise reduction part (8) by adhesive-layer (6), and on the upper surface of described noise reduction part (8), having multiple longitudinal sections that are arranged side by side is the sound-absorbing blind hole (7) of 3/4ths circles.
2. a kind of fast noise reduction blower fan according to claim 1, is characterized in that: described noise reduction part (8) is sponge, tapetum fibrosum or aluminium silicate wool.
3. a kind of fast noise reduction blower fan according to claim 1, is characterized in that: the angle of inclination of described snail tongue (5) the tip of the tongue is 15 ° ~ 35 °.
4. a kind of fast noise reduction blower fan according to any one in claim 1 ~ 3, it is characterized in that: described snail tongue (5) is short tongue, and snail tongue (5) is s apart from the distance of impeller (4) peak, the excircle of impeller (4) is S apart from the distance of spiral case (1) top inwall, and meets 0 < s < S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520164096.5U CN204664004U (en) | 2015-03-21 | 2015-03-21 | A kind of fast noise reduction blower fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520164096.5U CN204664004U (en) | 2015-03-21 | 2015-03-21 | A kind of fast noise reduction blower fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204664004U true CN204664004U (en) | 2015-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520164096.5U Expired - Fee Related CN204664004U (en) | 2015-03-21 | 2015-03-21 | A kind of fast noise reduction blower fan |
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| Country | Link |
|---|---|
| CN (1) | CN204664004U (en) |
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2015
- 2015-03-21 CN CN201520164096.5U patent/CN204664004U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150923 Termination date: 20160321 |
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| CF01 | Termination of patent right due to non-payment of annual fee |