Fan impeller structure

Abstract

The invention relates to a centrifugal fan component, in particular to a fan impeller structure which comprises an impeller disc, a cover plate and a plurality of blades arranged between the impeller disc and the cover plate. The cover plate covers the upper end of the blade, and the blade is provided with a radial inner part exposed from the inner edge of the cover plate; notches for increasing flow are concavely formed in the upper edges of the radial inner parts of at least part of the blades, so that the blades and the other blades are arranged in a high-low manner. The impeller is simple in structure, low in cost and easy to implement, the notches are formed in the upper edges of part of the arc-shaped blades to form a blade combination structure which is alternately arranged in a high-low mode, an air channel is optimized, a good flow guiding effect is provided, the impeller gas flow field is effectively improved on the premise that the diameter size of the impeller is kept unchanged, and the impeller efficiency is improved. The purposes of improving the air volume and efficiency of the centrifugal fan are achieved.

Description

Technical Field

[0001] The invention relates to centrifugal fan components, and in particular to a fan impeller structure. Background Art

[0002] As an important air power equipment, centrifugal fans are widely used in ventilation systems, industrial equipment cooling, aerospace, household appliances and other fields due to their high efficiency, multi-function and good stability. With the advancement of science and technology and the continuous improvement of application needs, the performance requirements for centrifugal fans are becoming increasingly stringent, especially in terms of increasing air volume, reducing energy consumption and reducing noise.

[0003] At present, the design and optimization of centrifugal fans mainly focus on the following aspects: 1. Blade design: Traditional blade design focuses on the curvature, inclination and number of blades. Some studies have shown that fan efficiency can be improved to a certain extent by optimizing the geometry of the blades. However, conventional blade optimization methods still have limitations in increasing air volume.

[0004] 2. Speed ​​adjustment: Increasing the fan speed is a direct way to increase the air volume. However, this method has obvious disadvantages. First, the noise increases: high-speed operation will cause the fan to generate loud noise, affecting the comfort of the use environment. Second, the life is shortened: high-speed operation aggravates the wear of fan components and shortens the service life of the fan. Third, energy consumption increases: increasing the speed significantly increases energy loss and reduces the energy efficiency of the fan.

[0005] 3. Increasing the impeller size: Increasing the impeller diameter can increase the fan's air volume and air pressure, but it is not suitable for applications with limited space. It will also cause problems such as increased fan noise and increased motor load. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the above-mentioned problem and provide a fan impeller structure which can increase the air volume and improve the efficiency without increasing the overall external dimensions.

[0007] The technical solution of the present invention is: A fan impeller structure described in the present invention includes an impeller disk, a cover plate and a plurality of blades arranged therebetween, and is characterized in that: the blades are in the shape of arc sheets, the cover plate covers the upper ends of the blades and the blades have a radial inner portion exposed from the inner edge of the cover plate; the upper edges of the radial inner portions of at least some of the blades are recessed with notches for increasing the flow rate, thereby forming a high and low arrangement with the remaining blades.

[0008] In this structure, the blades are divided into two groups, one with notches and the other without notches, so that the blades are distributed high and low, which can not only ensure a good drainage and guiding effect, but also optimize the air duct without increasing the overall space layout. Part of the airflow can flow through the notches, reducing the accumulation of airflow at the leading edge of the blade, reducing resistance, and effectively increasing the fan flow.

[0009] Furthermore, in the fan impeller structure of the present invention, the blades with notches and the blades without notches are arranged at intervals around the center of the impeller disc. The alternating structure of high and low blades not only helps to drive more air flow, but also ensures uniform airflow distribution.

[0010] Furthermore, in the fan impeller structure of the present invention, the notch is in an arc shape extending downward and radially inward from the inner edge of the cover plate. By designing the shape of the notch to be a smooth arc and reasonably designing its starting position, the smoothness of gas flow is improved, air flow turbulence is reduced, and air volume loss is reduced.

[0011] Furthermore, in the fan impeller structure described in the present invention, the height of the notch is at least 1 / 2 of the blade height. By optimizing the height range of the notch, the fan can be guided and the impeller air flow can be increased, thereby enhancing the fan efficiency.

[0012] Furthermore, in the fan impeller structure of the present invention, the contour line of the radial inner side of the blade includes an arc line extending downward and radially inwardly concave, and the inner ends of the arc lines of all blades are located on the same circumference of the impeller disk. By adopting a smooth arc line contour design for the radial inner side of the blade, the airflow entering the impeller is smoother, reducing the turbulence of the airflow when entering the impeller; at the same time, the same circumference line arrangement can ensure that the airflow enters evenly, which is conducive to the uniform distribution of pressure.

[0013] Furthermore, in the fan impeller structure described in the present invention, the upper edge of the blade without the notch is flush with the upper end surface of the cover plate.

[0014] Furthermore, in the fan impeller structure described in the present invention, the impeller disc, cover plate, and blades are all made of PA6 plastic.

[0015] Furthermore, in the fan impeller structure described in the present invention, the impeller disc, cover plate, and blades are formed by integral molding or separate welding.

[0016] The beneficial effects of the present invention are: The present invention has a simple structure, low cost and is easy to implement. It only requires setting notches on the upper edges of some arc-shaped blades to form a blade combination structure with high and low blades arranged alternately, thereby optimizing the air duct, providing a good flow guidance effect, and effectively improving the impeller gas flow field while keeping the impeller diameter unchanged, thereby achieving the purpose of increasing the air volume and efficiency of the centrifugal fan and reducing gas flow losses.

[0017] The present invention designs the notch on the upper edge of the blade and the contour line on the radial inner side of the blade to be a smooth arc, which helps to improve the smooth flow performance of the airflow, reduce the airflow resistance, and reduce the turbulent noise of the airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0019] Figure 2 It is a top view schematic diagram of the present invention.

[0020] Figure 3 It is a left side schematic diagram of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described with reference to the accompanying drawings: Reference Figure 1 and Figure 2 As shown, a fan impeller structure described in this embodiment includes an impeller disc 1, a cover plate 2, and a plurality of blades 3 arranged therebetween. The blades 3 are in the shape of arc sheets, and the cover plate 2 covers the upper ends of the blades 3 and has a radial inner portion exposed from the inner edge of the cover plate 2. The upper edges of at least some of the radial inner portions of the blades 3 are recessed with notches 4 for increasing the flow rate, thereby forming a high-low arrangement with the remaining blades 3. Specifically, in combination with Figure 1 and Figure 3 The notch 4 is in an arc shape extending downward and radially inward from the inner edge of the cover plate 2, and the height of the notch 4 is at least 1 / 2 of the height of the blade 3. In this embodiment, the blades 3 with notches 4 and the blades 3 without notches 4 are arranged at intervals around the center of the impeller disk 1. The upper edge of the blade 3 without notches 4 is flush with the upper end surface of the cover plate 2. The radial inner contour line 5 of the blade 3 includes an arc line extending downward and radially inward, and the inner ends of the arc lines of all blades 3 are located on the same circumferential line of the impeller disk 1.

[0022] The working principle of this embodiment is: by designing an arc-shaped notch 4 on some blades 3, the blades 3 on the entire impeller disk 1 are arranged in a high-low interval structure, and the notch 4 and the radial inner side of the blade 3 both adopt a smooth arc contour, and the above arc is set to a shape that extends downward and radially inward, thereby achieving a good guiding effect on the airflow, allowing the airflow to flow smoothly on the impeller disk 1, thereby increasing the ventilation flow, enhancing the impeller's air supply capacity, and evenly distributing the pressure, with less turbulence and low noise.

[0023] In this embodiment, the impeller disc 1, cover plate 2, and blades 3 are all made of PA6 plastic, which is lightweight and has high mechanical strength, thus reducing the energy consumption of the fan and achieving the purpose of lightweight design. At the same time, in the selection of manufacturing process, the impeller disc 1, cover plate 2, and blades 3 can be formed in one piece, which has good integrity, high dimensional accuracy, and high structural strength; or they can be formed by separate welding, with parts being processed separately and then reassembled, which makes mold design less difficult, easy to achieve mass production, and low manufacturing and processing costs.

[0024] The specific embodiments described herein are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention are still covered by the claims of the present invention.

Claims

1. A fan impeller structure, comprising an impeller disc, a cover plate and a plurality of blades disposed therebetween, characterized in that: The blades are in the shape of arc sheets, the cover plate covers the upper end of the blades and the blades have a radial inner portion exposed from the inner edge of the cover plate; the upper edge of the radial inner portion of at least some blades is recessed with a notch for increasing the flow rate, thereby forming a high-low arrangement with the remaining blades.

2. The fan impeller structure according to claim 1, characterized in that: The blades with notches and the blades without notches are arranged at intervals around the center of the impeller disk.

3. The fan impeller structure according to claim 1, characterized in that: The notch is in an arc shape extending downward and radially inward from the inner edge of the cover plate.

4. The fan impeller structure according to claim 1, characterized in that: The height of the notch is at least 1 / 2 of the height of the blade.

5. The fan impeller structure according to claim 1, characterized in that: The contour line of the radial inner side of the blade comprises an arc line extending downward and radially inwardly concave, and the inner ends of the arc lines of all the blades are located on the same circumferential line of the impeller disk.

6. The fan impeller structure according to claim 1, characterized in that: The upper edge of the blade without the notch is flush with the upper end surface of the cover plate.

7. The fan impeller structure according to claim 1, characterized in that: The impeller disc, cover plate and blades are all made of PA6 plastic.

8. The fan impeller structure according to claim 1 or 7, characterized in that: The impeller disc, cover plate and blades are formed in one piece or by separate welding.

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