A centrifugal fan

Abstract

The utility model discloses a centrifugal fan, including volute, the impeller of installing in volute and the motor of installing volute, the impeller includes the several blades of circumferential distribution, and one end of blade is connected with the wind wheel chassis, and the other end of blade is connected with the wind wheel frame, and the air duct is formed between two adjacent blades, and the axle hole is equipped with the mounting sleeve of the wind wheel frame convexity to the outside of axle hole, and the rotating shaft of motor reaches the mounting sleeve, and it is equipped with two lateral through -holes on the mounting sleeve symmetry, and the end of rotating shaft extension end is equipped with fixed through -hole, and two lateral through -holes are aligned with fixed through -hole, and a rivet passes through fixed through -hole and two lateral through -holes and will rotating shaft and impeller be fixed together. The mounting sleeve reduces the impeller weight, and the installation of rotating shaft and impeller is simple and reliable, and the production cost of centrifugal fan is reduced, and the efficiency of centrifugal fan is also promoted.

Description

Technical Field

[0001] This utility model relates to a centrifugal fan. Background Technology

[0002] Existing centrifugal fans include a volute, an impeller mounted inside the volute, and a motor mounted on the volute. The impeller consists of several circumferentially distributed blades, one end of which is connected to the impeller base, and the other end to the impeller frame. An air duct is formed between adjacent blades. The impeller base has a central shaft hole, and a mounting post is riveted to the periphery of the shaft hole. The mounting post protrudes from the impeller base towards the impeller frame. The motor shaft extends into the mounting post, which has a mounting hole through which a screw passes. The tail of the screw faces the flat part of the shaft, securing the impeller to the shaft. To prevent loosening, the screw needs to be coated with thread-locking adhesive. This impeller-shaft connection structure has the following disadvantages: 1. Because the impeller is fixed with screws, and a fixing post is riveted to the middle of the impeller base, the weight is increased, increasing motor energy consumption; 2. Because the impeller fixing post needs to be separately processed and then riveted to the base, material and processing costs are increased. 3. The impeller is fixed to the shaft with screws. To prevent loosening during long-term operation, thread-locking adhesive is applied to the screws. This involves many steps and requires strict control over the amount of adhesive used and the curing process, resulting in low product reliability. Utility Model Content

[0003] This utility model provides a centrifugal fan to solve the problems of excessively heavy impellers, high processing costs, and complicated installation of impellers and shafts in existing centrifugal fans.

[0004] The technical solution of this utility model is implemented as follows:

[0005] The purpose of this utility model is to provide a centrifugal fan, including a volute, an impeller installed inside the volute, and a motor mounted on the volute. The impeller includes several blades distributed circumferentially. One end of each blade is connected to the impeller chassis, and the other end is connected to the impeller frame. An air duct is formed between adjacent blades. The impeller chassis has a shaft hole at its center, and a mounting sleeve protruding towards the impeller frame is provided around the shaft hole. The motor shaft extends into the mounting sleeve. The feature is that the mounting sleeve has two symmetrical transverse through holes, and the end of the shaft protruding from the shaft has a fixing through hole. The two transverse through holes are aligned with the fixing through hole. A rivet passes through the fixing through hole and the two transverse through holes and fixes the shaft to the impeller.

[0006] The diameter D1 of the fixed through hole and the diameter D2 of the transverse through hole mentioned above satisfy the condition that D1 < D2.

[0007] The two ends of the aforementioned fixed through hole are chamfered.

[0008] The aforementioned mounting sleeve is formed by stretching along the hole of the shaft hole in the wind turbine chassis.

[0009] Compared with the prior art, this utility model has the following advantages:

[0010] 1. The centrifugal fan includes a volute, an impeller mounted inside the volute, and a motor mounted on the volute. The impeller includes several blades distributed circumferentially. One end of each blade is connected to the impeller chassis, and the other end is connected to the impeller frame. An air duct is formed between adjacent blades. The impeller chassis has a shaft hole at its center, and a mounting sleeve protruding towards the impeller frame is provided around the shaft hole. The motor shaft extends into the mounting sleeve. The mounting sleeve has two symmetrical transverse through holes, and the end of the shaft protruding from the shaft has a fixing through hole. The two transverse through holes are aligned with the fixing through hole. A rivet passes through the fixing through hole and the two transverse through holes to fix the shaft to the impeller. The mounting sleeve reduces the weight of the impeller, and the installation of the shaft and impeller is simple and reliable, reducing the production cost of the centrifugal fan and improving its efficiency.

[0011] 2. Other advantages of this utility model are described in detail in the embodiments section. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a centrifugal fan provided in an embodiment of the present utility model;

[0013] Figure 2 Top view of the centrifugal fan;

[0014] Figure 3 for Figure 2 AA cross-sectional view;

[0015] Figure 4 for Figure 3 Enlarged view of point B;

[0016] Figure 5 This is a schematic diagram of the impeller in a centrifugal fan.

[0017] Figure 6 This is a structural diagram of the wind turbine from another angle;

[0018] Figure 7 This is a schematic diagram of the motor in a centrifugal fan. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] like Figures 1 to 7 As shown, this embodiment provides a centrifugal fan, including a volute 4, an impeller 1 installed inside the volute 4, and a motor 2 installed on the volute 4. The impeller 1 includes several blades 11 distributed circumferentially. One end of the blades 11 is connected to the impeller base 12, and the other end of the blades 11 is connected to the impeller frame 13. An air duct is formed between two adjacent blades 11. The impeller base 12 has a shaft hole 14 at its center, and a mounting sleeve 15 protruding towards the impeller frame is provided around the shaft hole 14. The rotating shaft 21 of the motor 2 extends into the mounting sleeve 15. The mounting sleeve 15 is characterized by having two symmetrical transverse through holes 16. The end of the extended end of the rotating shaft 21 is provided with a fixing through hole 22. The two transverse through holes 16 are aligned with the fixing through hole 22, i.e., arranged in a straight line. A rivet 3 passes through the fixing through hole 22 and the two transverse through holes 16 and fixes the rotating shaft 21 and the impeller 1 together.

[0021] The centrifugal fan has a sleeve 15 that reduces the weight of the impeller 1, and the installation of the shaft 21 and the impeller 1 is simple and reliable, which reduces the production cost of the centrifugal fan and improves its efficiency.

[0022] The diameter D1 of the fixed through hole 22 and the diameter D2 of the transverse through hole 16 satisfy the condition that D1 < D2. When the rivet 3 passes through the fixed through hole 22 and the transverse through hole 16, the gap between the rivet 3 and the fixed through hole 22 is small, while the gap between the rivet 3 and the radial hole D2 of the transverse through hole 16 is large. When the rivet 3 is riveted, the expansion generated in the mating section with the fixed through hole 22 is small, while the expansion generated at both ends is large, so that the three parts are in full contact after riveting, avoiding the risk of loosening or detachment due to gaps.

[0023] The fixed through hole 22 described above has chamfers 23 at both ends. The chamfers 23 create a transition angle at the larger step when the rivet 3 undergoes plastic deformation during riveting. When the shaft 21 rotates, the shear stress transmitted to the impeller 1 through the rivet 3 is evenly distributed, avoiding stress concentration in the rivet 3, preventing cracks from forming during long-term operation, and reducing the risk of rivet 3 breaking, thereby improving the reliability of the centrifugal fan.

[0024] The mounting sleeve 15 described above is formed by stretching along the hole in the shaft hole 14 of the impeller chassis 12. The mounting sleeve 15 is simple to manufacture, further reducing the production cost of the centrifugal fan.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A centrifugal fan, comprising a volute (4), an impeller (1) mounted inside the volute (4), and a motor (2) mounted on the volute (4), wherein the impeller (1) comprises a plurality of blades (11) arranged circumferentially, one end of the blades (11) being connected to a fan base (12), the other end of the blades (11) being connected to a fan frame (13), and an air duct being formed between adjacent blades (11), wherein a shaft hole (14) is provided at the center of the fan base (12), and a mounting sleeve (15) protruding towards the fan frame is provided around the shaft hole (14), and the rotating shaft (21) of the motor (2) extends into the mounting sleeve (15), characterized in that: The mounting sleeve (15) is symmetrically provided with two transverse through holes (16), and the end of the extended end of the rotating shaft (21) is provided with a fixed through hole (22). The two transverse through holes (16) are aligned with the fixed through hole (22). A rivet passes through the fixed through hole (22) and the two transverse through holes (16) and fixes the rotating shaft (21) and the impeller (1) together.

2. A centrifugal fan according to claim 1, characterized in that: The diameter D1 of the fixed through hole (22) and the diameter D2 of the transverse through hole (16) satisfy the condition that D1 < D2.

3. A centrifugal fan according to claim 2, characterized in that: The fixed through hole (22) has chamfers (23) at both ends.

4. A centrifugal fan according to any one of claims 1 to 3, characterized in that: The mounting sleeve (15) is formed by stretching along the hole of the shaft hole (14) of the wind turbine chassis (12).

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