阅读说明：本技术 多段高效离心式叶轮 (Multi-section high-efficiency centrifugal impeller ) 是由 包福兵 凃程旭 尹招琴 高晓燕 许飞 金积君 于 2019-12-17 设计创作，主要内容包括：本发明公开了一种多段高效离心式叶轮。本发明包括风叶、轮毂、前盘、中盘和后盘；所述的轮毂连接中盘,中盘的两侧通过风叶与前盘、后盘连接；所述的轮毂连接中盘,中盘的两侧通过风叶与前盘、后盘连接；所述的轮毂中心开有通孔,用于固定发动机的轴,所述的风叶采用多段叶片,相邻段之间的叶片存在间隙,通过改变多段叶轮间的相对间隙位置和相对间隙厚度来调整离心式叶轮的效率和噪音；所述的相对间隙位置为间隙到叶片前缘的距离除以多段叶片的弦长；所述的相对间隙厚度为间隙厚度除以多段叶片的最大厚度。本发明具有效率更高、噪音更低的优点。(The invention discloses a multi-section efficient centrifugal impeller. The invention comprises a fan blade, a hub, a front disc, a middle disc and a rear disc; the hub is connected with the middle disc, and two sides of the middle disc are connected with the front disc and the rear disc through the fan blades; the hub is connected with the middle disc, and two sides of the middle disc are connected with the front disc and the rear disc through the fan blades; the center of the hub is provided with a through hole for fixing a shaft of an engine, the fan blade adopts a plurality of sections of blades, gaps exist between the adjacent sections of the blades, and the efficiency and the noise of the centrifugal impeller are adjusted by changing the relative gap position and the relative gap thickness among the plurality of sections of impellers; the relative gap position is the distance from the gap to the front edge of the blade divided by the chord length of the multi-section blade; the relative gap thickness is the gap thickness divided by the maximum thickness of the multiple sections of blades. The invention has the advantages of higher efficiency and lower noise.)

1. The multi-section efficient centrifugal impeller comprises fan blades, a hub, a front disc, a middle disc and a rear disc; the hub is connected with the middle disc, and two sides of the middle disc are connected with the front disc and the rear disc through the fan blades; the wheel hub center open and to have the through-hole for the axle of fixed engine, its characterized in that: the fan blade adopts a plurality of sections of blades, gaps exist between the blades of adjacent sections, and the efficiency and the noise of the centrifugal impeller are adjusted by changing the relative gap positions and the relative gap thicknesses among the plurality of sections of impellers; the relative gap position is the distance from the gap to the front edge of the blade divided by the chord length of the multi-section blade; the relative gap thickness is the gap thickness divided by the maximum thickness of the multiple sections of blades.

2. The multi-segment high efficiency centrifugal impeller of claim 1, wherein: the number of the blade sections is 2-5.

3. The multi-segment high efficiency centrifugal impeller of claim 1, wherein: the relative thickness of the gap is 0.4-1.8.

4. A multi-segment high efficiency centrifugal impeller according to any one of claims 1 to 3, wherein: the deflection angle of the fan blade outlet is 0-90 degrees.

5. A multi-segment high efficiency centrifugal impeller according to any one of claims 1 to 3, wherein: the number of the fan blades is 20-160.

Technical Field

The invention relates to the field of centrifugal fans, in particular to a multi-section efficient centrifugal impeller.

Background

With the development of science and technology, the centrifugal fan is regarded as a very common mechanical device in production and life, and is more and more emphasized by industrial production, which means that the centrifugal fan has higher requirements. In view of energy saving and consumption reduction, the improvement of the efficiency of the centrifugal fan is one aspect, and besides, along with the improvement of the living requirements of people, the noise reduction of the centrifugal fan is also an important part.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the centrifugal impeller capable of efficiently reducing noise.

The invention comprises a fan blade, a hub, a front disc, a middle disc and a rear disc; the hub is connected with the middle disc, and two sides of the middle disc are connected with the front disc and the rear disc through the fan blades; the hub is connected with the middle disc, and two sides of the middle disc are connected with the front disc and the rear disc through the fan blades; the center of the hub is provided with a through hole for fixing a shaft of an engine, the fan blade adopts a plurality of sections of blades, gaps exist between the adjacent sections of the blades, and the efficiency and the noise of the centrifugal impeller are adjusted by changing the relative gap position and the relative gap thickness among the plurality of sections of impellers; the relative gap position is the distance from the gap to the front edge of the blade divided by the chord length of the multi-section blade; the relative gap thickness is the gap thickness divided by the maximum thickness of the multiple sections of blades.

Furthermore, the number of the blade sections is 2-5.

Furthermore, the relative thickness of the gap is 0.4-1.8.

Furthermore, the deflection angle of the fan blade outlet is 0-90 degrees.

Furthermore, the number of the fan blades is 20-160.

Compared with the prior art, the centrifugal impeller has the advantages of higher efficiency and lower noise.

Drawings

Fig. 1 is a schematic structural diagram of a three-stage centrifugal fan impeller.

Fig. 2 is a schematic structural diagram of three-segment fan blades.

The notations in the figures have the following meanings: 1. a blade; 2. a through hole; 3. a hub; 4. a front plate; 5. a middle disc; 6. a rear disc; 7. a first blade; 8. a first gap; 9. a second blade; 10. a second gap; 11. and a third blade.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and it is to be understood that the detailed description is provided for purposes of illustration and explanation, and is not intended to limit the invention.

The invention provides a multi-section centrifugal impeller, which comprises fan blades, through holes, a hub, a front disc, a middle disc and a rear disc, wherein the front disc is arranged on the front disc; the hub is connected with the middle disc, and two sides of the middle disc are connected with the front disc and the rear disc through the fan blades; the center of the hub is provided with a through hole for fixing a shaft of an engine, the fan blade adopts a fan blade with specific thickness and deflection angle, a plurality of sections of blades are adopted, gaps exist among the blades between adjacent sections, and the efficiency and the noise of the centrifugal impeller are adjusted by changing the relative gap position and the relative gap thickness among the plurality of sections of impellers; the relative gap position is the distance from the gap to the front edge of the blade divided by the chord length of the multi-section blade; the relative gap thickness is the gap thickness divided by the maximum thickness of the multiple sections of blades.

The technical principle of the centrifugal impeller is as follows: when the airflow passes through the narrow gaps among the multiple sections of blades, the speed is increased suddenly due to the change of the pressure, so that the kinetic energy of the blade boundary layer behind the gaps is increased, the airflow is extruded on the surfaces of the blades and is not easy to separate, the airflow is enabled to flow more stably, and the efficiency of the centrifugal fan blade is improved. In addition, narrow and small clearance between the multistage blade still has the effect of rectification, can let the more even impeller runner of entering of air current for the pressure pulsation of impeller passageway diminishes, plays the effect of making an uproar. The efficiency and noise reduction of the centrifugal fan blade can be optimized by changing the positions and thicknesses of gaps among the multiple sections of blades.

Furthermore, the multistage contain 2~5 sections, including the biggest thickness t of multistage blade, multistage blade chord length is C.

Furthermore, the thickness comprises two thicknesses, wherein one thickness is the thickness h of the fan blade; the other is a gap relative thickness w (w = gap thickness s/maximum thickness t of the multi-section blade), which is 0.4-1.8.

Furthermore, the deflection angle is an outlet deflection angle and is 0-90 degrees.

Furthermore, the number of the blades is 20-160.

The gap position B is a relative position, and means a distance a between the gap and the leading edge of the blade/a chord length C of the multi-stage blade. For example, the optimal gap position B of the two segments of fan blades is 0.23-0.47.