CN208348150U - A kind of small-sized multi-wing centrifugal exhaust fan of highly effective low noise and impeller - Google Patents
A kind of small-sized multi-wing centrifugal exhaust fan of highly effective low noise and impeller Download PDFInfo
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- CN208348150U CN208348150U CN201820061953.2U CN201820061953U CN208348150U CN 208348150 U CN208348150 U CN 208348150U CN 201820061953 U CN201820061953 U CN 201820061953U CN 208348150 U CN208348150 U CN 208348150U
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Abstract
The utility model embodiment discloses a kind of impeller of small-sized multi-wing centrifugal exhaust fan of highly effective low noise, and by making blade twist and layback, so that impeller blade inlet angle is gradually changed according to axis direction, blade interior flowing is more reasonable；It is thickeied by blade bottom, increases blade strength and stability, while increased exit angle, reducing outlet flow size, increase outflow wind speed and wind pressure；To improve flowing and reducing the reflux between hub disk and spiral case gap, hub disk is changed to band conical ring by circular ring shape.This secondary design improves runner characteristic, reduces impeller blade to the percussion of air-flow, reduces noise and reduce loss.
Description
Technical Field
The utility model relates to an air discharge fan especially relates to a small-size multi-wing centrifugal air discharge fan of high-efficient low noise.
Background
Along with the rapid development of Chinese economy and science and technology, the living standard of people is improved, the Chinese household appliance market is also changed day by day, the exhaust fan is more and more widely applied in various industries, the quality and performance requirements of consumers on the exhaust fan are higher and higher, and the exhaust fan is expected to meet the requirements of low noise, high efficiency and small volume under the condition of meeting the flow. There is a corresponding relationship between these parameters. The multi-wing centrifugal exhaust fan has been the first choice for the household exhaust fan due to its advantages of high pressure coefficient, large flow coefficient and small volume.
Because the fan theory is still imperfect at present, the flow field inside the fan is complex and difficult to describe, and especially the design of a small centrifugal exhaust fan often depends on empirical data. According to the traditional fan design method, according to the functional requirements of products, designers propose a design scheme according to experience, analyze and experiment a given party and seek a final feasible scheme according to the product requirements.
The performance parameters (flow, wind pressure, noise and efficiency) of the fan mainly depend on the through-flow quality of a fan channel, and the multi-wing centrifugal fan mainly comprises a current collector, an impeller and a volute, wherein the current collector is used for guiding gas to the impeller; the impeller mainly applies work to the gas, and the motor drives the impeller to apply work to the gas; the volute mainly plays the roles of gas collection, guiding and diffusion, and radiates noise through the surface of the volute. The most critical influence of the impeller parameters on the centrifugal exhaust fan includes the inner-outer diameter ratio, the width (height), the blade diameter, the inlet-outlet installation angle, the number of blades and the like of the impeller.
At present, the most studied by domestic research workers is the influence of impeller performance parameters on fan flow, pressure, noise and efficiency. Because the impeller and the volute are complex in shape and high in mold opening manufacturing cost, most of researches are based on theoretical researches or simulated through software by establishing a fluid equation. Most impellers in the market at present adopt theoretical design formulas, but because ventilators are wide in types, even though ventilators of the same type have many subdivided types, theoretical calculation formulas are not completely applicable. The blades of many centrifugal exhaust fans in the current market are designed as single-arc straight blades. The blade flow channel is a key position for the transition of air flow from the air inlet to the air outlet, and the shape of the blade is changed according to different working conditions so as to reduce aerodynamic noise and energy loss.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve provides a small-size multi-wing centrifugal exhaust fan of high-efficient low noise. The exhaust fan can better accord with the flow field rule, reduce noise and improve efficiency.
In order to solve the above technical problem, an embodiment of the present invention provides an impeller of a high-efficiency low-noise small-sized multi-blade centrifugal exhaust fan, which includes blades, wherein the front edge direction of each blade is twisted and tilted backwards along the rear edge direction, the twist angle is 8 ° to 12 °, and the tilt angle is 2 ° to 6 °.
Further, the inlet angle of the blade is in a circular arc structure.
Further, the inlet angle of the vane ranges from 40 ° to 50 °.
Further, the angle of the outlet angle of the blade ranges from 165 ° to 175 °.
Furthermore, the distance of the flow channels between the blades is 6 mm-8 mm.
Furthermore, the chassis at the root part of the impeller is obliquely cut by an angle of 6-12 degrees.
Further, the arc radius of the blade is as follows:
wherein D is2Is the outer diameter of the impeller, D1Is the impeller inner diameter, β2Angle of exit angle of impeller, β1Angle of inlet angle of impeller, R1Is the inner radius of the impeller, R2Is the outer radius of the impeller.
Furthermore, the radius of the central arc of the impeller is
Furthermore, the upper half section of the blade is twisted and tilted backwards, and the lower half section of the blade is thickened and tilted backwards through drawing.
The embodiment of the utility model provides a still disclose a small-size multi-wing centrifugal exhaust fan of high-efficient low noise, its impeller that has included above-mentioned scheme.
Implement the embodiment of the utility model provides a, following beneficial effect has: the utility model makes the inlet angle of the impeller blade gradually change according to the axis direction by twisting and bending back the blade of the impeller; through the thickening of blade bottom, not only increase blade intensity and steadiness, increase outlet angle simultaneously, reduce export runner size, increase outflow wind speed and wind pressure. This design has improved the runner characteristic, reduces the impact effect of impeller blade to the air current, reduces the noise and reduces the loss.
Drawings
Fig. 1 is a structural schematic view of a cross section of a blade of the present invention;
fig. 2 is a schematic view of the overall structure of the blade of the present invention;
fig. 3 is a schematic structural view of the bottom bevel cutting of the impeller of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.
Reference is made to the schematic structural diagram shown in fig. 1.
The utility model discloses impeller of the small-size multi-wing centrifugal exhaust fan of high-efficient low noise, the blade that sets up on the circumference.
The air flow of the exhaust fan enters from the current collector, enters the impeller chamber, enters the blade flow channel through the front edge of the blade, finally exits from the rear edge of the blade, enters the flow channel of the impeller and the volute, moves and flows out through the outlet. The velocity of the gas flow is a resultant velocity during the whole flowing process of the gas flow, and the velocity and the direction of the gas flow are constantly changed, as shown in the following formula:
wherein,is a vector of the velocity of the air flow,is the component of the air flow velocity in the axial direction of the impeller,is the component of the speed of the air flow in the circumferential direction of the impellerIs the radial component of the velocity of the gas flow along the impeller.
Before the air flow enters the collector, the circumferential speed of the air flow changes little, the circumferential speed changes much at the edge of the collector, the circumferential speed changes little and does not change much at the axis, the main speed of the air flow is the axial speed1The axial variation is a small circumferential velocity just after the flow enters the impeller, the inlet angle β1The axial circumferential velocity is gradually increased, the attack angle of the airflow to the blade is reduced, and the inlet angle β is reduced1And correspondingly smaller to reduce the impact of the airflow on the blades, as shown in figure 1.
In order to solve the above technical problem, the blade twist angle is preferably about 80 to 120 degrees (in the present embodiment, the blade twist angle is preferably 100 degrees), and the blade back elevation angle is preferably 20 to 40 degrees (in the present embodiment, the blade back elevation angle is preferably 30 degrees) by the blade twist and the blade pitch, as shown in fig. 2.
The total length H of the vanes (equal to the height H of the impeller) is 70mm and the effective flow width at the impeller inlet is about 0.75 of the width of the vanes. The blades are designed in a segmented mode, 50-60 mm (55 mm) at the upper half segment 3/4 is twisted by 10 degrees along the rotating direction, and the blades are tilted backwards by 3 degrees, as shown in figure 2. The 25mm of the lower half 1/4 part adopts the thickening of straight blade (die drawing thickening, die drawing angle 1 degree), 3 degrees of back-bending. The blade of the embodiment is also chamfered on the inlet side of the blade besides twisting and tilting backwards, and the structure is schematically shown in figure 2.
The whole size problem of air discharge fan is considered, in order to reduce the installation size as much as possible under the same flow and pressure, and simultaneously reduce the noise. Outer diameter D of impeller2Taking phi 126mm and inner diameter D1Taking 102mm, the ratio D of the inner diameter to the outer diameter1/D20.81. Impeller height h ═ 0.4-0.6) D2H is 70mm, exit angle β2170 ° entrance angle β1＝42°。
The arc radius of the blade is as follows:
the radius of the central arc of the impeller is
To lengthen the acceleration path of the blade outlet, the blade inlet path is correspondingly shortened, while ensuring a sufficiently large outlet angle β2And entrance angle β1Thus, by varying the blade arc radius RkAnd the radius R of the central arc of the impeller0Are each Rk＝6.3mm，R055.4mm as shown in figure 1. The blade is thick, and when the blade thickness t is 1mm, the arc outer diameter R of the blade isk' -7.3 mm. The width (flow channel width) t between the impeller blades is (0.7-1.2) RkThe t of small impeller blade is 1.1RkThen the number of leaves z ═ pi × D1/t＝42。
The traditional impeller blade inlet adopts an acute angle inlet, so that when airflow enters a flow channel, the acute angle notch enables the airflow to be separated violently, and noise and energy loss are caused. The utility model discloses blade after the improvement replaces the acute angle incision with the airfoil circular arc, makes the air current get into blade runner process level and smooth like this, reduces the violent differentiation of air current, reduces noise and energy loss.
More preferably, in order to prevent the gas coming out of the impeller from flowing back to the inside of the impeller from the gap below the rear disc of the impeller, the rear disc is designed to be conical in the embodiment, and forms an angle of 8-12 degrees with the conventional disc surface, the angle of 10 degrees is preferred in the embodiment, as shown in fig. 3, and the shaded part is a cut-off part. After cutting, the clearance of the impeller ground is gradually reduced from the center of the impeller to the edge by 10 degrees.
The embodiment of the utility model provides an adopt the airfoil circular arc to replace the acute angle, adopt to twist reverse blade, the back-up blade, the oblique homoenergetic of impeller chassis is effectively increased air discharge fan flow 1% ~ 3% at impeller blade entrance, reduces 0.5dB ~ 3 dB's noise. Compared with the prior conventional blade, the improved blade has the advantages that the flow is improved by 8-10 percent, and the noise is reduced by 2-3 dB. The utility model discloses an impeller air discharge fan can effectively promote its wholeness ability.
The above-mentioned embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which should not be construed as limiting the scope of the present invention. All modifications made according to the spirit of the main technical scheme of the present invention shall be covered within the protection scope of the present invention.
Claims (10)
1. The impeller of the high-efficiency low-noise small-sized multi-wing centrifugal exhaust fan is characterized by comprising blades, wherein the front edge direction of each blade is twisted and tilted backwards along the rear edge direction, the twisting angle is 8-12 degrees, and the tilting angle is 2-6 degrees.
2. The impeller of a high efficiency low noise compact multiple wing centrifugal exhaust fan according to claim 1 wherein the inlet angle of the blades is in a circular arc configuration.
3. The impeller of a high efficiency low noise small multi-vane centrifugal exhaust fan as claimed in claim 2, wherein the angle of the inlet angle of the vane is in the range of 40 ° to 50 °.
4. The impeller of a high efficiency low noise compact multi-vane centrifugal exhaust fan as claimed in claim 3, wherein the angle of the outlet angle of the blades ranges from 165 ° to 175 °.
5. The impeller of a high efficiency low noise small size multi-blade centrifugal exhaust fan as claimed in claim 4, wherein the distance of the flow path between the blades is 6mm to 8 mm.
6. The impeller of the high-efficiency low-noise small-sized multi-wing centrifugal exhaust fan as claimed in claim 5, wherein the chassis at the root of the impeller is chamfered at an angle of 6-12 °.
7. The impeller of a high efficiency low noise compact multiple wing centrifugal exhaust fan according to claim 6 wherein the radius of the blade arc is:
wherein D is2Is the outer diameter of the impeller, D1Is the impeller inner diameter, β2Angle of exit angle of impeller, β1Angle of inlet angle of impeller, R1Is the inner radius of the impeller, R2Is the outer radius of the impeller.
8. The impeller of a high efficiency low noise small size multi-blade centrifugal exhaust fan as claimed in claim 7, wherein the radius of the arc of the center of the impeller is
9. The impeller of a high efficiency low noise small size multi-blade centrifugal exhaust fan as claimed in claim 7, wherein the upper half of the blade is twisted and tilted backward and the lower half of the blade is thickened and tilted backward.
10. A high efficiency, low noise, compact, multi-winged centrifugal exhaust fan comprising an impeller according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820061953.2U CN208348150U (en) | 2018-01-15 | 2018-01-15 | A kind of small-sized multi-wing centrifugal exhaust fan of highly effective low noise and impeller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820061953.2U CN208348150U (en) | 2018-01-15 | 2018-01-15 | A kind of small-sized multi-wing centrifugal exhaust fan of highly effective low noise and impeller |
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| CN201820061953.2U Expired - Fee Related CN208348150U (en) | 2018-01-15 | 2018-01-15 | A kind of small-sized multi-wing centrifugal exhaust fan of highly effective low noise and impeller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131324A (en) * | 2018-01-15 | 2018-06-08 | 汕头大学 | A kind of small-sized multi-wing centrifugal exhaust fan of highly effective low noise and impeller |
| CN113757133A (en) * | 2021-07-27 | 2021-12-07 | 无锡曲速智能科技有限公司 | High-efficiency double-inlet multi-wing fan driven by inner rotor motor and design method thereof |
-
2018
- 2018-01-15 CN CN201820061953.2U patent/CN208348150U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131324A (en) * | 2018-01-15 | 2018-06-08 | 汕头大学 | A kind of small-sized multi-wing centrifugal exhaust fan of highly effective low noise and impeller |
| CN113757133A (en) * | 2021-07-27 | 2021-12-07 | 无锡曲速智能科技有限公司 | High-efficiency double-inlet multi-wing fan driven by inner rotor motor and design method thereof |
| CN113757133B (en) * | 2021-07-27 | 2024-05-14 | 无锡曲速智能科技有限公司 | Double-inlet multi-wing fan driven by high-efficiency inner rotor motor and design method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190108 Termination date: 20210115 |
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| CF01 | Termination of patent right due to non-payment of annual fee |