CN201963599U

CN201963599U - Low-noise fan blade of cooling fan

Info

Publication number: CN201963599U
Application number: CN2011200489594U
Authority: CN
Inventors: 马宝发
Original assignee: CHANGCHUN RI YONG - JEA GATE ELECTRIC Co Ltd; Shanghai Malu Riyong-Jea Gate Electric Co Ltd; Shanghai Ri Yong Jea Gate Electric Co Ltd
Current assignee: CHANGCHUN RI YONG - JEA GATE ELECTRIC Co Ltd; Shanghai Malu Riyong-Jea Gate Electric Co Ltd; Shanghai Ri Yong Jea Gate Electric Co Ltd
Priority date: 2011-02-28
Filing date: 2011-02-28
Publication date: 2011-09-07
Anticipated expiration: 2021-02-28

Abstract

The utility model provides a low-noise fan blade of a cooling fan, which is formed into a whole by a hub, blades and a fan ring. A fan assembly is formed by a coupling device and a motor as well as a fan cowl, wherein the number of the blades is nine; the nine blades are distributed at unequal distances; and the distribution angles are 40.45 degrees, 40.66 degrees, 39.35 degrees, 39.38 degrees, 40.16 degrees, 41.16 degrees, 39.58 degrees, 39.58 degrees and 39.24 degrees in sequence in the counter-clockwise direction. Compared with a fan blade with a ring in the prior art, the strength of the blades is improved, the value of noise is reduced and the comfort level of sound is optimized by the low-noise fan blade of the cooling fan.

Description

The low noise fan blade of cooling fan

Technical field

The utility model relates to a kind of fan, relates in particular to a kind of low noise fan blade of cooling fan.

Background technique

The fan blade that the cooling fan that uses in vapour (sedan-chair) car at present adopts is divided into band fan blade and band fan blade not on the structure, be divided into prismatic blade and bent blades on the blade profile.

Along with developing of automobile industry, people are more and more higher for the requirement of automobile function, not only pursue outward appearance, more pay attention to its internal quality and travelling comfort.For cooling fan for cars, its air quantity and noise are main performance index, and often demand is under certain working condition in car load manufacturing enterprise, and fan has higher air quantity and lower power consumpiton, this just requires fan that higher efficient is arranged, and requires fan that lower noise is arranged again simultaneously.And along with the progress of science and technology, there has been more requirement in each car load manufacturing enterprise to noise quality now, not only requires global noise low, and requires on noise spectrum, and the noise difference of successive bands can not surpass certain limit value.

What a kind of fan product of prior art used is a kind of fan blade of 6 uniform bands of blade, and when high speed rotating was worked, noise decibel numerical value was higher and people's ear subjective comfort is relatively poor.

The model utility content

The purpose of this utility model in order to provide a kind of under the situation that satisfies the fan flow performance, can reduce noise exactly, improves the low noise fan blade of the cooling fan of acoustical mass.

In order to achieve the above object, the utility model has adopted following technological scheme: a kind of low noise fan blade of cooling fan, by wheel hub, blade with protect vane and form one, by hitch bar and motor and wind shelling cover composition fan assembly, be characterized in: described blade is nine, nine blades are not equally spaced, and distribution angle is by counterclockwise being followed successively by 40.45 °, 40.66 °, 39.35 °, 39.38 °, 40.16 °, 41.16 °, 39.58 °, 39.58 ° and 39.24 °.

Described blade adopts forward inclined type, equidistantly get 11 Cross section Design from interior radial outer diameter, 11 cross sections are followed successively by 0 ° ,-0.245 ° ,-0.122 °, 0.146 °, 0.668 °, 1.744 °, 3.219 °, 5.188 °, 8.437 °, 12.383 ° and 16.186 ° from the bend angle of interior radial outer diameter; 11 cross sections are followed successively by 30.66 °, 26.95 °, 24.12 °, 21.90 °, 20.11 °, 18.64 °, 17.42 °, 16.38 °, 15.48 °, 14.70 ° and 14.02 ° from the setting angle of interior radial outer diameter; Be followed successively by 39.30mm, 40.43mm, 41.51mm, 42.62mm, 43.81mm, 45.09mm, 46.49mm, 48.00mm, 49.64mm, 51.41mm and 53.33mm from the chord length in the blade radius cross section of interior radial outer diameter.

The blade profile relative thickness of described blade is 6% by 7% transition, and the blade profile trailing edge is made rounding and handled.

The low noise fan blade of cooling fan of the present utility model has been owing to adopted above technological scheme, have following advantage and and characteristics:

1, blade adopts the odd number sheet not to be equally spaced, and advantage is not only to reduce the numerical value of noise, has more optimized the level of comfort of sound.

2, adopt the forward curved vane structure,, not only improve the intensity of blade, more play the effect of optimizing the flow field and optimizing noise by suitable antecurvature angle.

3, adopted the structure of protecting vane at vane tip, improve blade strength, overcome when high speed rotating, the bigger variation of the blade radially stretching antecurvature angle that causes and vane airfoil profile established angle under centrifugal action guarantees that the ride quality of fan blade can big again variation.Owing to protect the support reinforcing effect of vane, the irregular chatterin of blade when having overcome rotation has been avoided having optimized the level of comfort of sound owing to blade is shaken the extraordinary noise that causes simultaneously.

4, Blade Design has adopted the change circular rector flow pattern of Δ Curn=constant, and index n changes along the radius rule, has optimized the flow field, has improved efficient and has reduced noise.

Description of drawings

Fig. 1 is the basic structure schematic representation of the low noise fan blade of the utility model cooling fan;

Fig. 2 is the setting angle and the cross section chord length schematic representation in 11 cross sections of the blade in the utility model.

Embodiment

Referring to Fig. 1, Fig. 2, the low noise fan blade of the utility model cooling fan is by wheel hub 1, blade 2 with protect vane 3 and form one, fan blade is the integral molded plastic goods, blade 2 Ye Dingchu with protect vane 3 and be connected, the place is connected with wheel hub 1 blade root, and shaft coupling structure 4 is arranged on the wheel hub 1.Motor shaft is connected with fan blade by shaft coupling structure 4, drives the fan blade rotation and carries air.

For improving the acoustics performance of fan blade, blade is nine and is not equally spaced that distribution angle is by counterclockwise being followed successively by 40.45 °, 40.66 °, 39.35 °, 39.38 °, 40.16 °, 41.16 °, 39.58 °, 39.58 ° and 39.24 °.Shown in the A2 among Fig. 1.

Equidistantly get 11 during Blade Design and calculate the cross section, for noise reduction and improve the intensity of blade, blade adopts forward inclined type, is followed successively by 0 ° ,-0.245 ° ,-0.122 °, 0.146 °, 0.668 °, 1.744 °, 3.219 °, 5.188 °, 8.437 °, 12.383 ° and 16.186 ° from the bend angle of interior radial outer diameter.Shown in the A1 among the figure one.

For obtaining stable flow field, and can move under the highest static pressure efficiency down in the operating mode (static pressure, flow) of appointment, fan blade adopts and becomes the circular rector flow pattern, makes total head increase and make full use of the acting of leaf top along radius, and reduces the blade root load.11 cross sections are followed successively by 30.66 °, 26.95 °, 24.12 °, 21.90 °, 20.11 °, 18.64 °, 17.42 °, 16.38 °, 15.48 °, 14.70 ° and 14.02 ° from the setting angle of interior radial outer diameter; Be followed successively by 39.30mm, 40.43mm, 41.51mm, 42.62mm, 43.81mm, 45.09mm, 46.49mm, 48.00mm, 49.64mm, 51.41mm and 53.33mm from the chord length in the blade radius cross section of interior radial outer diameter.As shown in Figure 2.

By NACA67907, a=0.5 progressively transition is NACA67906 from interior radial outer diameter blade radius cross section aerofoil profile, a=0.5, and both the blade profile relative thickness was 6% by 7% transition.The blade profile trailing edge is made rounding and is handled, and both has been easy to process, can improve the flow field at the trailing edge place again.The key data of the blade in the utility model is as shown in table 1.

Table 1

Claims

1. the low noise fan blade of a cooling fan, by wheel hub, blade with protect vane and form one, by hitch bar and motor and wind shelling cover composition fan assembly, it is characterized in that: described blade is nine, nine blades are not equally spaced, and distribution angle is by counterclockwise being followed successively by 40.45 °, 40.66 °, 39.35 °, 39.38 °, 40.16 °, 41.16 °, 39.58 °, 39.58 ° and 39.24 °.

2. the low noise fan blade of cooling fan as claimed in claim 1, it is characterized in that: described blade adopts forward inclined type, equidistantly get 11 Cross section Design from interior radial outer diameter, 11 cross sections are followed successively by 0 ° ,-0.245 ° ,-0.122 °, 0.146 °, 0.668 °, 1.744 °, 3.219 °, 5.188 °, 8.437 °, 12.383 ° and 16.186 ° from the bend angle of interior radial outer diameter; 11 cross sections are followed successively by 30.66 °, 26.95 °, 24.12 °, 21.90 °, 20.11 °, 18.64 °, 17.42 °, 16.38 °, 15.48 °, 14.70 ° and 14.02 ° from the setting angle of interior radial outer diameter; Be followed successively by 39.30mm, 40.43mm, 41.51mm, 42.62mm, 43.81mm, 45.09mm, 46.49mm, 48.00mm, 49.64mm, 51.41mm and 53.33mm from the chord length in the blade radius cross section of interior radial outer diameter.

3. the low noise fan blade of cooling fan as claimed in claim 1, it is characterized in that: the blade profile relative thickness of described blade is 6% by 7% transition, the blade profile trailing edge is made rounding and is handled.