Large-arc-angle blade structure of centrifugal fan impeller

Abstract

The large-arc-angle blade structure of the centrifugal fan impeller comprises an impeller front disc, an air inlet is formed in the center of the impeller front disc, a plurality of blades are fixedly connected to one side of the impeller front disc at equal intervals in the circumferential direction, one ends of the blades are welded and fixed to the impeller front disc through welding feet, and the other ends of the blades are welded and fixed to the impeller front disc through welding feet. The impeller is characterized in that the end portion, welded with the impeller front disc, of each blade is a welding end, the welding end of each blade is of a Y-shaped structure with two forked ends, and two arc structures are formed on the outer walls of the two sides of each welding end. The influence of welding on impeller deformation is reduced, impeller quality is guaranteed more easily, meanwhile, a large arc angle is formed at the joint of the welding end of the blade and the impeller front disc, airflow can flow smoothly in the impeller, vortex is avoided, and therefore the efficiency of a fan is improved.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan technology, specifically to a blade structure with a large arc angle for a centrifugal fan impeller. Background Technology

[0002] The impeller is the core component of a centrifugal fan. Driven by a motor, the impeller rotates, generating centrifugal force that draws air in and exhausts it from the fan, achieving air circulation and ventilation. Its size and geometry have a significant impact on the characteristics and performance of the centrifugal fan. Centrifugal fan impellers are generally composed of a front (middle) disc, a rear disc, blades, and a shaft disc. According to the processing method, they can usually be divided into two main types: welded assembly type and riveted assembly type. Fans made of special materials may also use casting, such as explosion-proof cast aluminum centrifugal fan impellers.

[0003] Riveted impellers have high process requirements and consume a lot of time, and were a common method for early impellers. Welded impellers have developed rapidly and have become the main processing technology for impellers today. Welded impellers eliminate rivets that are prone to stress concentration and intergranular corrosion, have higher strength than riveted impellers, and save welding time. Therefore, welded impellers are being used more and more widely.

[0004] Traditional centrifugal fan impeller blades and front plate welded structure (see...) Figure 2 and Figure 3 Blade 3 is perpendicular to the impeller front plate 1 and is fixed by welding. The welding of blade 3 to the impeller front plate 1 and the impeller rear plate are all fillet welds. During welding, the deformation of the weld angle will cause the blade 3 to be skewed, affecting the quality of the impeller. In severe cases, it will also cause the front plate and the rear plate to be eccentric, affecting the overall installation quality. In order to ensure the connection strength between the blade and the front plate and the rear plate, the weld leg should not be too small, which will cause excessive welding stress, causing the front plate and the rear plate to be wavy and deformed, affecting the quality of the impeller. At the same time, when the airflow flows in the impeller, a strong vortex will be generated at the right angle, causing the airflow temperature to rise and reducing the efficiency of the fan.

[0005] Therefore, it is necessary to design a blade structure with a large radius of curvature for centrifugal fan impellers to improve the above-mentioned problems. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a blade structure with a large arc angle for centrifugal fan impellers. By setting the welded end of the blade to a Y-shaped structure, the distance between the weld seams on both sides is increased. Under the same welding strength, the influence of welding on impeller deformation is reduced, making it easier to ensure impeller quality. At the same time, the welded end of the blade forms a large arc angle at the connection with the front disc of the impeller, allowing the airflow to flow smoothly within the impeller and avoiding eddies, thereby improving the efficiency of the fan.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A centrifugal fan impeller blade structure with a large arc angle includes an impeller front plate, an air inlet at the center of the impeller front plate, and a plurality of blades fixedly connected at equal intervals along the circumferential direction on one side of the impeller front plate. One end of each blade is welded to the impeller front plate by a welding foot. The end of the blade that is welded to the impeller front plate is called the welding end. The welding end of the blade has a Y-shaped structure with two bifurcated ends, and the outer walls on both sides of the welding end form two arc structures.

[0009] As a preferred embodiment of this utility model, the radius of the arc structure is greater than or equal to 15mm.

[0010] As a preferred embodiment of this utility model, both bifurcated ends of the welding end are provided with a contact surface, and the contact surface is arranged parallel to the end face of the impeller front disc.

[0011] As a preferred embodiment of this utility model, when the mating surface on the welding end is in close contact with the impeller front plate, a welding gap is formed between the two forked ends of the welding end and the impeller front plate. The welding gap is used to accommodate the welding foot and weld the welding end to the impeller front plate.

[0012] As a preferred embodiment of this utility model, the blade is precision cast.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention sets the welded end of the blade in a Y-shape, increasing the distance between the weld seams on both sides. This reduces the impact of welding on impeller deformation while maintaining the same welding strength, making it easier to ensure impeller quality. At the same time, the welded end of the blade forms a large arc angle at the connection with the front disc of the impeller, allowing the airflow to flow smoothly within the impeller and avoiding eddies, thereby improving the efficiency of the fan. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the welded end of the blade and the welded joint between the blade and the front disc of the impeller in a centrifugal fan impeller with a large arc angle.

[0016] Figure 2 This is a schematic diagram of the external shape of a centrifugal fan impeller in the prior art;

[0017] Figure 3 This is a cross-sectional view of the weld between the blade and the impeller front disc in the prior art.

[0018] In the diagram: 1. Impeller front plate; 2. Air inlet; 3. Blade; 31. Welding end; 4. Weld foot. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model. Example

[0020] Please see Figure 1 This embodiment provides a centrifugal fan impeller blade structure with a large arc angle, including an impeller front plate 1, an air inlet 2 at the center of the impeller front plate 1, and a plurality of blades 3 fixedly connected at equal intervals along the circumferential direction on one side of the impeller front plate 1. One end of the blades 3 is welded to the impeller front plate 1 by welding feet 4. The end of the blades 3 that is welded to the impeller front plate 1 is a welding end 31. The welding end 31 of the blades 3 has a Y-shaped structure with two bifurcated ends. The outer walls on both sides of the welding end 31 form two arc structures. By setting the welding end 31 of the blades 3 as a Y-shaped structure, the distance between the weld seams on both sides is increased. Under the same welding strength, the influence of welding on impeller deformation is reduced, and the impeller quality is more easily guaranteed. At the same time, the large arc angle formed at the connection between the welding end 31 of the blades 3 and the impeller front plate 1 allows the airflow to flow smoothly in the impeller, avoids eddies, and thus improves the efficiency of the fan.

[0021] In this embodiment, the radius of the arc structure is greater than or equal to 15mm. The radius of the arc structure is designed mainly based on the size of the blade 3 and the compatibility design with the specifications of the centrifugal fan.

[0022] In this embodiment, both bifurcated ends of the welding end 31 are provided with a contact surface, which is parallel to the end face of the impeller front disc 1. By providing a contact surface on the welding end 31, when the blade 3 is welded to the impeller front disc 1, the welding end 31 of the blade 3 can be attached to the end face of the impeller front disc 1 through the contact surface, providing a positioning function for the blade 3, so that the welding position of the blade 3 is perpendicular to the impeller front disc 1, avoiding the problem of the blade 3 being skewed during the welding process, which would affect the quality of the impeller.

[0023] In this embodiment, when the mating surface on the welding end 31 is tightly attached to the impeller front disk 1, welding gaps are formed between the two bifurcated ends of the welding end 31 and the impeller front disk 1. The welding gaps are used to accommodate the welding feet 4, and the welding end 31 is welded and fixed to the impeller front disk 1. Through the welding gap formed between the welding end 31 of the blade 3 and the impeller front disk 1, the welding feet 4 fill the gap, which is used to weld and fix the welding end 31 of the blade 3 to the impeller front disk 1, thereby increasing the welding area of ​​the welding end 31 of the blade 3 and effectively improving the welding firmness.

[0024] In this embodiment, the blade 3 is precision cast. Precision casting involves injecting molten metal into a mold using a high-precision mold and high-quality casting materials. After cooling and solidification, a casting with a complex shape and high precision is obtained. In blade manufacturing, the precision casting process can ensure that the dimensional accuracy, surface quality, and internal structure of the blade meet the design requirements.

[0025] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A centrifugal fan impeller blade structure with a large arc angle, comprising an impeller front disc (1), wherein an air inlet (2) is provided at the center of the impeller front disc (1), and a plurality of blades (3) are fixedly connected at equal intervals along the circumferential direction on one side of the impeller front disc (1), wherein one end of the blades (3) is welded to the impeller front disc (1) by welding feet (4), characterized in that: The end of the blade (3) that is welded to the impeller front disc (1) is the welding end (31). The welding end (31) of the blade (3) is a Y-shaped structure with two bifurcated ends. The outer walls on both sides of the welding end (31) form two arc structures.

2. The blade structure of a centrifugal fan impeller with a large arc angle according to claim 1, characterized in that: The radius of the arc structure is greater than or equal to 15 mm.

3. The blade structure of a centrifugal fan impeller with a large arc angle according to claim 1, characterized in that: The welding end (31) has a bonding surface on both bifurcated ends, and the bonding surface is parallel to the end face of the impeller front disc (1).

4. The blade structure of a centrifugal fan impeller with a large arc angle according to claim 3, characterized in that: When the mating surface on the welding end (31) is tightly attached to the impeller front plate (1), a welding gap is formed between the two forked ends of the welding end (31) and the impeller front plate (1). The welding gap is used to accommodate the welding foot (4) and to weld and fix the welding end (31) to the impeller front plate (1).

5. The blade structure of a centrifugal fan impeller with a large arc angle according to claim 1, characterized in that: The blade (3) is precision cast.

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