Fan impeller structure

Abstract

The utility model 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 utility model relates to a centrifugal fan component, in particular to a fan impeller structure. Background Art

[0002] As an important aerodynamic device, centrifugal fans are widely used in ventilation systems, industrial equipment cooling, aerospace, household appliances, and other fields due to their high efficiency, versatility, and excellent stability. With the advancement of technology and the continuous increase in application demand, 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:

[0004] 1. Blade Design: Traditional blade design focuses primarily on blade curvature, pitch, and number. Some studies have shown that optimizing blade geometry can improve fan efficiency to a certain extent. However, conventional blade optimization methods still have limitations in increasing airflow.

[0005] 2. Speed ​​Adjustment: Increasing fan speed is a direct way to increase air volume. However, this method has significant drawbacks. First, increased noise: High-speed operation causes the fan to generate loud noise, affecting the user's comfort level. Second, shortened lifespan: High-speed operation increases wear on fan components, shortening the fan's service life. Third, increased energy consumption: Increasing the speed significantly increases energy loss, reducing the fan's energy efficiency.

[0006] 3. Enlarging the impeller: Increasing the diameter of the fan impeller can increase the fan's air volume and air pressure, but it is not suitable for application scenarios with limited space. It will also bring problems such as increased fan noise and increased motor load. Utility Model Content

[0007] The technical problem to be solved by the present invention is to overcome the above problems and provide a fan impeller structure that increases air volume and improves efficiency without increasing the overall external dimensions.

[0008] The technical solution of the utility model is:

[0009] The utility model describes a fan impeller structure comprising 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 radially inner portions exposed from the inner edge of the cover plate; the upper edges of the radially inner portions of at least some of the blades are recessed with notches for increasing flow, thereby forming a high-low arrangement with the remaining blades.

[0010] 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.

[0011] Furthermore, in the fan impeller structure described in the present invention, blades with notches and blades without notches are arranged at intervals around the center of the impeller disc. The alternating arrangement of high and low blades not only helps to drive more air flow, but also ensures uniform airflow distribution.

[0012] Furthermore, in the fan impeller structure of the present invention, the notch is arc-shaped, extending downward and radially inward from the inner edge of the cover plate. By designing the notch into a smooth arc and rationally positioning its starting position, the smoothness of gas flow is improved, airflow turbulence is reduced, and air volume loss is minimized.

[0013] 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, it can both guide the air flow and increase the air flow of the impeller, thereby enhancing the fan efficiency.

[0014] Furthermore, in the fan impeller structure described in the present invention, the radially inner contours of the blades comprise arcs extending downward and radially inwardly concave, with the inner ends of the arcs of all blades located on the same circumference of the impeller disk. By employing a smooth arc profile design for the radially inner sides of the blades, airflow into the impeller is smoother, reducing turbulence upon entry. Furthermore, the circumferential arrangement ensures uniform airflow and contributes to even pressure distribution.

[0015] 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.

[0016] Furthermore, in the fan impeller structure described in the present invention, the impeller disc, cover plate, and blades are all made of PA6 plastic.

[0017] Furthermore, in the fan impeller structure described in the present invention, the impeller disc, cover plate, and blades are formed in one piece or welded separately.

[0018] The beneficial effects of the utility model are:

[0019] The utility model has a simple structure, low cost and is easy to implement. It only requires setting notches on the upper edges of some curved blades to form a blade combination structure with alternating high and low arrangements, which optimizes the air duct and provides a good flow guiding effect. It also effectively improves 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.

[0020] The utility model designs the notch on the upper edge of the blade and the contour line on the radial inner side of the blade into a smooth arc shape, 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

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0022] Figure 2 It is a top view schematic diagram of the present invention.

[0023] Figure 3 It is a left side schematic diagram of the present utility model. DETAILED DESCRIPTION

[0024] The present invention will now be further described with reference to the accompanying drawings:

[0025] Reference Figure 1 and Figure 2 As shown, the 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 the radial inner portions of at least some 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 notches 4 are arc-shaped, extending downward and radially inward from the inner edge of the cover plate 2. The height of the notches 4 is at least half the height of the blades 3. In this embodiment, blades 3 with notches 4 and blades 3 without notches 4 are spaced apart around the center of the impeller disk 1. The upper edges of the blades 3 without notches 4 are flush with the upper end surface of the cover plate 2. The radially inner contour lines 5 of the blades 3 include arcs extending downward and radially inward, with the inner ends of these arcs of all blades 3 located on the same circumference of the impeller disk 1.

[0026] The working principle of this embodiment is: by designing arc-shaped notches 4 on some blades 3, the blades 3 on the entire impeller disk 1 are arranged in a high-low interval structure, and the notches 4 and the radial inner sides of the blades 3 both adopt smooth arc contours. The above-mentioned arc is set to a shape that is concave and 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 achieving balanced pressure distribution, low turbulence, and low noise.

[0027] In this embodiment, the impeller disc 1, cover plate 2, and blades 3 are all made of PA6 plastic, resulting in a lightweight product with high mechanical strength, reducing the fan's energy consumption and achieving the goal of lightweight design. Furthermore, in terms of manufacturing process, the impeller disc 1, cover plate 2, and blades 3 can be integrally molded, achieving good integrity, high dimensional accuracy, and high structural strength. Alternatively, they can be welded together, with separate parts processed and then reassembled, simplifying mold design, facilitating mass production, and reducing manufacturing costs.

[0028] The specific embodiments described herein are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, any equivalent modifications or alterations made by a person skilled in the art without departing from the spirit and technical concepts disclosed in this utility model are encompassed by the claims of this utility model.

Claims

1. A fan impeller structure comprising an impeller disk, 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 and 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 blade height.

5. The fan impeller structure according to claim 1, characterized in that: 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 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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