Impeller for centrifugal blower with riveted structure

Abstract

This invention provides an impeller for a centrifugal blower with a riveting structure, comprising a front disc, a rear disc, and blades. Each blade includes a blade body with multiple blade fixing teeth on both sides. The front and rear discs have multiple riveting holes. The blades are connected to the front and rear discs via the blade fixing teeth passing through the riveting holes. After passing through the riveting holes, the front ends of the blade fixing teeth on both sides of the blade body are located on the outer sides of the front and rear discs, respectively. The outer blade fixing teeth are locked to their adjacent outer ends, achieving riveting fixation between the blades and the front and rear discs. This impeller uses a riveting method, which has a short processing cycle and low investment cost. Furthermore, it is made of aerospace-grade aluminum plate, which has high strength and can be applied to large-diameter, high-speed impellers. At the same time, the lightweight nature of aerospace-grade aluminum plate does not increase the bearing load. This invention can be widely applied to the processing of impellers in centrifugal blowers.

Description

Technical Field

[0001] This utility model relates to an impeller, and more particularly to an impeller for a centrifugal blower with a riveting structure. Background Technology

[0002] Currently, most centrifugal blower impellers are made of cast aluminum alloy. After casting, they are then processed and assembled. However, the production cycle is long and the cost is high due to the casting process.

[0003] Furthermore, due to the low strength and porous nature of cast aluminum alloy, it cannot be used in large-diameter, high-speed impellers, such as impellers with a diameter of 1200mm and a speed of 3600 rpm, resulting in significant limitations in its application. At the same time, impellers made of cast aluminum alloy are relatively heavy, which will increase the load on the bearings and shorten their service life during long-term operation. Utility Model Content

[0004] This utility model addresses the above-mentioned technical problems by providing an impeller for a centrifugal blower with a riveting structure. The impeller structure is fixed by riveting, which has a short production cycle and low investment cost. Furthermore, the front disc, rear disc, inlet ring, blades, and reinforcing disc are all made of aviation aluminum plate, which has high strength and dense material, and can be used in large-diameter, high-speed impellers. At the same time, the impeller made of aviation aluminum plate is lightweight, which will not increase the load on the bearing or shorten the service life of the bearing during long-term operation.

[0005] Therefore, the technical solution of this utility model is an impeller for a centrifugal blower with a riveting structure, including a front plate, a rear plate, and blades. The blades are located between the front plate and the rear plate, and there are multiple blades distributed along the circumferential direction between the front plate and the rear plate.

[0006] The blade includes a blade body, and two outwardly protruding blade fixing teeth are provided on both sides of the blade body. There are multiple blade fixing teeth, which are distributed on both sides of the blade body along the length of the blade body.

[0007] The front and rear discs are each provided with multiple through riveting holes, and multiple blade fixing teeth can be inserted into the inside of the riveting holes;

[0008] The blades are connected to the front and rear discs by blade fixing teeth passing through the riveting holes from the inside to the outside. After passing through the riveting holes, the two sides of the blade body are respectively attached to the front and rear discs. After they are attached, the front ends of the blade fixing teeth on both sides of the blade body are located on the outer side of the front and rear discs respectively. Then, the blade fixing teeth on the outer side of the front and rear discs are locked to each other with the adjacent ends of their corresponding riveting holes. Finally, the riveting and fixing between the blades and the front and rear discs is achieved.

[0009] After the blades are riveted and fixed to the front and rear discs, airflow channels are provided between two adjacent blades and the front and rear discs.

[0010] Preferably, the multiple blades are arranged perpendicularly to the end faces of the front and rear discs.

[0011] Preferably, after multiple blade fixing teeth on both sides of the blade body pass through the riveting holes from the inside to the outside, the portion of the blade fixing teeth located on the outer side of the front and rear discs is bent and locked to the adjacent outer end face of the corresponding riveting hole, thereby realizing the riveting fixation between the blade and the front and rear discs.

[0012] Preferably, the blade fixing teeth on the blade body are of a double-layer structure. After multiple double-layer blade fixing teeth pass through the riveting holes from the inside to the outside, the double-layer blade fixing teeth are respectively bent and fit together with the adjacent end faces on both sides of the corresponding riveting holes to achieve the riveting fixation between the blade and the front and rear discs.

[0013] Preferably, chamfers are provided at both ends of the outer side of the blade fixing teeth.

[0014] Preferably, after the portion of the blade fixing tooth located on the outer side of the front and rear discs is fitted with the adjacent outer end face of the corresponding riveting hole, the blade fixing tooth is welded and fixed to the adjacent outer end face of the corresponding riveting hole.

[0015] Preferably, an air intake hole is provided in the middle of the front disc, and an inlet ring is fixedly provided on the inner circumference of the air intake hole;

[0016] A limiting support hole is provided in the middle of the rear plate. A shaft plate is provided inside the limiting support hole. A through fixing hole is provided in the middle of the shaft plate. The shaft plate includes a shaft plate fixing connection section and a shaft plate sealing support section. The shaft plate fixing connection section is located on the inner side of the rear plate and is fixedly connected to the inner side of the limiting support hole on the rear plate. The shaft plate sealing support section is located inside the limiting support hole and fits and seals with the fixing hole. After the shaft plate fixing connection section is fixedly connected to the rear plate, the outermost part of the shaft plate sealing support section extends beyond the outermost position of the rear plate.

[0017] A reinforcing disc is provided on the outer circumference of the rear disc, which extends beyond the rear disc on the shaft disc sealing support section. The reinforcing disc is fixedly connected to the rear disc.

[0018] Preferably, the shaft plate fixed connecting section, the rear plate and the reinforcing plate are respectively provided with fixing holes, and the shaft plate fixed connecting section, the rear plate and the reinforcing plate are riveted together by rivets passing through the fixing holes.

[0019] Preferably, the front disc, rear disc, blades, inlet ring, and reinforcing disc are all made of aviation aluminum plate;

[0020] The thickness of the front disc is 4.5mm±0.2mm, the thickness of the rear disc is 6mm±0.2mm, the thickness of the blades and inlet ring is 2mm±0.2mm, and the thickness of the reinforcing disc is 3.5mm±0.2mm.

[0021] The beneficial effects of this utility model are:

[0022] 1. During the assembly process of this impeller, after multiple blade fixing teeth on both sides of the blade body pass through the riveting holes from the inside to the outside, the part of the blade fixing teeth located on the outer side of the front and rear discs is bent and fits against the adjacent end face of the corresponding riveting hole. The bending method can avoid gaps between the blade and the front and rear discs, and finally realize the riveting fixation between the blade and the front and rear discs, so that it can be used in large-diameter, high-speed blowers.

[0023] Meanwhile, the riveting method has lower costs compared to casting, as it eliminates the need for casting molds and only requires laser cutting and drilling. The installation process is simple and quick, and the production cycle is significantly shorter than that of casting. More importantly, it allows for quick adjustment of the cutting size according to the actual impeller size, eliminating the need for multiple sets of casting molds, further reducing costs and shortening the production cycle.

[0024] 2. Because the blade fixing teeth on the blade body are of a double-layer structure, multiple double-layer blade fixing teeth pass through the riveting holes from the inside to the outside. The double-layer blade fixing teeth are bent and fit together with the adjacent end faces on both sides of the corresponding riveting holes, so as to realize the riveting fixation between the blade and the front and rear discs. This "bidirectional bending fixation" method achieves a higher strength riveting fixation between the blade and the front and rear discs, so that it can be applied to blowers with larger diameters and higher speeds, ensuring the stability of the impeller structure during long-term high-speed rotation of the blower.

[0025] 3. By providing fixing holes in the fixed connecting section of the shaft disc, the rear disc, and the reinforcing disc, and riveting the fixed connecting section of the shaft disc, the rear disc, and the reinforcing disc together through the fixing holes, rapid assembly can be achieved, assembly efficiency can be improved, and the production cycle can be shortened.

[0026] 4. By using aviation aluminum plates for the front disc, rear disc, blades, inlet ring, and reinforcing disc, the impeller can be made of large-diameter, high-speed impellers. At the same time, the impeller made of aviation aluminum plates is lightweight and will not increase the load on the bearing or shorten the bearing's service life during long-term operation.

[0027] Meanwhile, since the front disc of the impeller experiences less force than the rear disc during blower operation, the thickness of the front disc is appropriately reduced to ensure stable impeller operation, also in order to achieve the goal of overall impeller weight reduction. Attached Figure Description

[0028] Figure 1 This is a perspective view of the utility model;

[0029] Figure 2 This is the front view of this utility model;

[0030] Figure 3 This is a utility model Figure 2 Sectional view of AA;

[0031] Figure 4 This is a schematic diagram of the front disc structure in this utility model;

[0032] Figure 5 This is a schematic diagram of the rear disc structure in this utility model;

[0033] Figure 6 This is a utility model Figure 3 Enlarged view at point B in the middle;

[0034] Figure 7 This is a three-dimensional view of the central shaft disc structure of this utility model;

[0035] Figure 8 This is a schematic diagram of the blade structure in this utility model.

[0036] Explanation of symbols in the diagram:

[0037] 1. Front plate; 2. Rear plate; 3. Blade; 301. Blade body; 302. Blade fixing tooth; 303. Chamfer; 4. Shaft plate; 401. Shaft plate fixing connection section; 402. Shaft plate sealing support section; 403. Rear section of shaft plate; 404. Fixing hole; 5. Inlet ring; 6. Reinforcing plate; 7. Riveting hole; 8. Air inlet; 9. Airflow channel; 10. Limiting support hole; 11. Fixing hole; 12. Rivet. Detailed Implementation

[0038] The present invention will be further described below with reference to the embodiments.

[0039] pass Figures 1-8As can be seen, the impeller for the centrifugal blower with riveting structure includes a front disc 1, a rear disc 2, and blades 3. The blades 3 are located between the front disc 1 and the rear disc 2. There are multiple blades 3, which are distributed circumferentially between the front disc 1 and the rear disc 2. Each blade 3 includes a blade body 301. The blade body 301 has outwardly protruding blade fixing teeth 302 on both sides. The front disc 1 and the rear disc 2 are respectively provided with through riveting holes 7. The blade fixing teeth 302 can be inserted into the riveting holes 7. The blades are connected to the front and rear discs by the blade fixing teeth passing through the riveting holes from the inside to the outside. After passing through the riveting holes, the two sides of the blade body are respectively attached to the front and rear discs. After being attached, the front ends of the blade fixing teeth on both sides of the blade body are located on the outer side of the front and rear discs, respectively. Then, the blade fixing teeth on the outer side of the front and rear discs are locked to each other with the adjacent outer ends of their corresponding riveting holes, thus achieving the riveting fixation between the blades and the front and rear discs.

[0040] After the blade 3 is riveted and fixed to the front plate 1 and the rear plate 2, an airflow channel 9 is provided between two adjacent blades 3 and the front plate 1 and the rear plate 2. The airflow channel 9 is used to realize the transmission of gas when the blower is running.

[0041] In one specific embodiment, multiple blades 3 are arranged perpendicularly to the end faces of the front disc 1 and the rear disc 2. This perpendicular arrangement has a prominent effect, as follows:

[0042] 1. When the blades are perpendicular to the front and rear disks, the change in the flow channel cross section (from inlet to outlet) between the two blades is uniform and controllable. At the same time, the flow channel width (axial width) remains unchanged, which can optimize the flow channel shape and reduce flow loss.

[0043] 2. Vertical blade walls help guide airflow more smoothly along the radial direction, reducing the complex secondary flow, separation vortex and friction loss generated by airflow impacting the blade walls in the flow channel, thus minimizing secondary flow and vortex.

[0044] 3. It can significantly improve aerodynamic efficiency. The blower can convert more input power into useful gas pressure energy and kinetic energy, thereby achieving higher efficiency.

[0045] 4. Since the force direction at the root of the blade is basically perpendicular to the connection surface, the stress state at the connection is relatively simple, such as tensile stress. This makes it easier to design and manufacture a connection structure with high strength and good rigidity, which significantly improves the structural strength and rigidity. Furthermore, the blade is not prone to bending deformation under strong centrifugal force, and can better maintain the designed flow channel shape.

[0046] 5. Due to its good structural symmetry and relatively uniform blade mass distribution, it is easier to perform dynamic balancing correction on the rotor, thereby reducing vibration amplitude during operation, reducing noise, and improving the stability of the blower operation.

[0047] If the blade 3 is inclined relative to the front plate 1 and the rear plate 2, there are obvious drawbacks. First, it will disrupt the flow channel shape and increase flow losses. Because the inclined blades will cause the flow channel width (axial width) between the blades to change along the flow direction, the flow channel will suddenly expand or contract during gas transmission, affecting the stability of gas transmission. In addition, it will induce secondary flow and separation phenomena. Second, the inclined blades may cause the airflow velocity and direction at the impeller outlet to be unevenly distributed in the circumferential direction, increasing eddy current losses. Furthermore, after the blades are inclined, their ability to resist bending deformation caused by centrifugal force is weaker, and the blades are more prone to greater bending deformation, which directly affects aerodynamic performance. It will also lead to a series of problems such as increased processing difficulty, difficulty in dynamic balancing, and high vibration and noise.

[0048] In one specific embodiment, there are multiple blade fixing teeth 302, which are evenly distributed on both sides of the blade body 301 along the length of the blade body 301. This can increase the uniformity of gas flow in each airflow channel 9 during impeller rotation and improve the stability of impeller rotation.

[0049] In one specific embodiment, multiple blade fixing teeth 302 on both sides of the blade body 301 pass through the riveting holes 7 from the inside out. The portion of the blade fixing teeth 302 located on the outer side of the front disc 1 and the rear disc 2 is bent to fit against the adjacent outer end face of the corresponding riveting hole 7. The bending method can avoid gaps between the blade and the front and rear discs, and finally realize the riveting fixation between the blade 3 and the front disc 1 and the rear disc 2, so that it can be applied to large-diameter, high-speed blowers. Compared with the casting process, the riveting method has low investment cost, does not require casting molds, and only requires laser blanking and drilling. The installation process is simple and quick. Compared with the casting process, the production cycle is significantly shortened. More importantly, the blanking size can be quickly adjusted according to the actual impeller size, without the need to prepare multiple sets of casting molds, further reducing investment costs and shortening the production cycle.

[0050] In one specific embodiment, the blade fixing teeth 302 on the blade body 301 have a double-layer structure. After multiple double-layer blade fixing teeth 302 pass through the riveting holes 7 from the inside to the outside, the double-layer blade fixing teeth 302 are respectively bent and fit together with the adjacent end faces on both sides of the corresponding riveting holes 7, so as to realize the riveting fixation between the blade 3 and the front plate 1 and the rear plate 2. This "bidirectional bending fixation" method achieves a higher strength riveting fixation between the blade and the front and rear plates, so that it can be applied to blowers with larger diameter and higher speed, ensuring the stability of the impeller structure during long-term high-speed rotation of the blower.

[0051] In one specific embodiment, chamfers 303 are provided at both ends of the outer side of the blade fixing tooth 302. The chamfers 303 play a guiding role in the process of inserting the blade fixing tooth 302 into the rivet hole 7, thereby improving assembly efficiency.

[0052] In one specific embodiment, after the portion of the blade fixing tooth 302 located on the outer side of the front disc 1 and the rear disc 2 is fitted with the adjacent outer end face of the corresponding rivet hole 7, the blade fixing tooth 302 is welded and fixed to the adjacent outer end face of the corresponding rivet hole 7. By welding and fixing, the reliability of the fixation between the blade 3 and the front disc 1 and the rear disc 2 can be further guaranteed.

[0053] In one specific embodiment, an air inlet 8 is provided at the middle position of the front disc 1, and an inlet ring 5 is fixedly provided on the inner circumference of the air inlet 8. In actual assembly, the position of the air inlet 8 is used to communicate with the air outlet of the air intake volute. By setting the inlet ring 5, the sealing between the air inlet 8 and the air outlet of the air intake volute can be increased, gas leakage can be prevented, and the efficiency of gas transmission can be improved.

[0054] During actual assembly, the inner end face of the inlet ring 5 should not exceed the inner end face of the adjacent front disc 1 to avoid obstruction during gas flow. If the inner end face of the inlet ring 5 exceeds the end face of the front disc 1, the excess portion of the inlet ring 5 will obstruct the airflow when the gas flows from the inside to the outside through the airflow channel 9, disrupting the smoothness of the airflow and causing turbulence of varying degrees within the airflow channel 9. This will impact the blades 3 to varying degrees, reduce gas transmission efficiency, and additionally increase the noise during blower operation.

[0055] A limiting support hole 10 is provided in the middle of the rear plate 2. A shaft plate 4 is provided inside the limiting support hole 10. A through fixing hole 404 is provided in the middle of the shaft plate 4. The shaft plate 4 includes a shaft plate fixing connection section 401 and a shaft plate sealing support section 402. The shaft plate fixing connection section 401 is located on the inner side of the rear plate 2 and is fixedly connected to the inner side of the limiting support hole 10 on the rear plate 2. The shaft plate sealing support section 402 is located inside the limiting support hole 10 and is fitted and sealed with the fixing hole 404. After the shaft plate fixing connection section 401 is fixedly connected to the rear plate 2, the outermost part of the shaft plate sealing support section 402 extends beyond the outermost position of the rear plate 2. The interior of the fixing hole 404 is used to fix and connect with the main shaft. The main shaft drives the impeller to rotate synchronously. At the same time, by fitting and sealing the shaft plate sealing support section 402 with the fixing hole 404, it is possible to prevent some gas from leaking outward from the gap between the shaft plate sealing support section 402 and the fixing hole 404 during gas transmission.

[0056] A reinforcing disc 6 is provided on the outer circumference of the portion of the rear disc 2 that extends beyond the shaft disc sealing support section 402. The reinforcing disc 6 is fixedly connected to the rear disc 2. By assembling the reinforcing disc 6, the stability of the impeller during rotation can be improved. Especially for large-sized impellers, it can prevent different degrees of shaking during impeller rotation and improve the stability of the blower operation.

[0057] In one specific embodiment, the shaft disk fixed connecting section 401, the rear disk 2 and the reinforcing disk 6 are respectively provided with fixing holes 11. The shaft disk fixed connecting section 401, the rear disk 2 and the reinforcing disk 6 are riveted and fixed to each other by rivets 12 passing through the fixing holes 11, which can realize rapid assembly, improve assembly efficiency and shorten the production cycle.

[0058] In one specific embodiment, the front disc 1, rear disc 2, blade 3, inlet ring 5, and reinforcing disc 6 are all made of aviation aluminum plate, which has high strength and dense material, and can be applied to large-diameter, high-speed impellers. At the same time, the impeller made of aviation aluminum plate is lightweight, and will not increase the load on the bearing or shorten the service life of the bearing during long-term operation.

[0059] The thickness of the front disc 1 is 4.5mm ± 0.2mm, the thickness of the rear disc 2 is 6mm ± 0.2mm, the thickness of the blade 3 and the inlet ring 5 is 2mm ± 0.2mm, and the thickness of the reinforcing disc 6 is 3.5mm ± 0.2mm. This size setting can minimize the overall weight of the impeller while ensuring stable impeller operation, and further improve the service life of bearings and related components. Since the front disc of the impeller is subjected to less force than the rear disc when the blower is running, the thickness of the front disc is appropriately reduced while ensuring stable impeller operation, in order to meet the overall weight reduction requirement of the impeller.

[0060] The processing method for the impeller of the centrifugal blower with the above-mentioned riveted structure includes the following steps:

[0061] Step (1): Select aviation aluminum plate of the required thickness, cut the front plate 1 and the rear plate 2 according to the outer diameter of the front plate 1, the inner diameter of the air inlet 8, the outer diameter of the rear plate 2, and the inner diameter of the limiting support hole 10. In addition, process multiple through fixing holes 11 on the rear plate 2 in the circumferential direction near the limiting support hole 10.

[0062] Step (2): Select aviation aluminum plate of the required thickness, cut blade 3 according to the size requirements of blade 3, and bend blade 3 according to the curvature requirements of blade 3.

[0063] Step (3): Based on the positions of the multiple blade fixing teeth 302 on both sides of the bent blade 3, respectively, through riveting holes 7 are machined at the corresponding positions on the cut front plate 1 and rear plate 2.

[0064] Step (4): Insert the blade fixing teeth 302 on one side of the multiple blades 3 into the corresponding rivet holes 7 on the rear plate 2 in the circumferential direction. After insertion, the blades 3 and the rear plate 2 are set perpendicularly to each other. Then, fix the blade body 301 and the end of the adjacent rear plate 2 by welding.

[0065] Step (5): Insert the multiple rivet holes 7 on the front disc 1 into the other side blade fixing teeth 302 on the multiple blades 3 in the circumferential direction. After insertion, bend the multiple blade fixing teeth 302 located on the outside of the front disc 1 in the circumferential direction. The bent blade fixing teeth 302 fit with the outer end of the front disc 1.

[0066] Step (6): Fix the bent blade fixing tooth 302 to the outer end of the front disc 1 by welding;

[0067] Step (7): Bend the multiple blade fixing teeth 302 located on the outer side of the rear plate 2 in sequence along the circumferential direction, and the bent blade fixing teeth 302 fit into the outer end of the rear plate 2.

[0068] Step (8): Fix the bent blade fixing tooth 302 to the outer end of the rear disc 2 by welding;

[0069] Step (9): Select aviation aluminum plate of the required thickness, cut the inlet ring 5 according to the inner diameter of the air inlet 8, insert the inlet ring 5 into the air inlet 8, and fix it by welding.

[0070] Step (10): Select a shaft disk 4 of appropriate size according to the inner diameter of the limiting support hole 10, and machine a through fixing hole 11 on the shaft disk fixed connection section 401 of the shaft disk 4 that corresponds to the fixing hole 11 on the rear disk 2.

[0071] Step (11): Cut the reinforcing disc 6 according to the outer diameter of the shaft disc sealing support section 402, and machine through fixing holes 11 on the reinforcing disc 6 that correspond to the fixing holes 11 on the rear disc 2 and the shaft disc 4.

[0072] Step (12): Insert the shaft disk sealing support section 402 of the shaft disk 4 into the inside of the limiting support hole 10. After insertion, the shaft disk fixing connection section 401 and the inner end face of the rear disk 2 are in contact with each other. At the same time, insert the reinforcing disk 6 and the shaft disk sealing support section 402 into each other. After insertion, the reinforcing disk 6 and the outer end face of the rear disk 2 are in contact with each other. Then, use rivets 12 to lock and fix the shaft disk 4, the rear disk 2 and the reinforcing disk 6 together.

[0073] Step (13): After assembly, grind the uneven parts on the impeller.

[0074] In a specific embodiment, the above processing method uses laser cutting for cutting the front disc 1, rear disc 2, blade 3, inlet ring 5, and reinforcing disc 6.

[0075] In one specific embodiment, the above processing method uses laser welding for welding and laser drilling for drilling.

[0076] In a specific embodiment, after the front disc 1 is cut and blanked in step (1), one side of the front disc 1 has an open structure;

[0077] For the assembly of the front disc 1 with the open structure, the specific operation steps of step (5) are as follows: the multiple riveting holes 7 on the front disc 1 are inserted into the blade fixing teeth 302 on the other side of the multiple blades 3 in the circumferential direction from one side of the opening position on the front disc 1. After the insertion is in place, the opening position of the front disc 1 is fixed by welding. Then, the multiple blade fixing teeth 302 located on the outside of the front disc 1 are bent in the circumferential direction. The bent blade fixing teeth 302 are attached to the outer end of the front disc 1. In this way, the overall flatness of the fit between the front disc 1 and the blades 3 can be guaranteed, and the connection gap between the front disc 1 and the blade body 301 can be avoided. This can prevent the gas from leaking out through the gap during the gas transmission process and improve the stability of the gas transmission.

[0078] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. An impeller for a centrifugal blower with a riveted structure, characterized in that: It includes a front plate, a rear plate, and blades. The blades are located between the front plate and the rear plate. There are multiple blades, and the multiple blades are distributed in a circumferential direction between the front plate and the rear plate. The blade includes a blade body, and the blade body has outwardly protruding blade fixing teeth on both sides. There are multiple blade fixing teeth, and the multiple blade fixing teeth are distributed on both sides of the blade body along the length direction of the blade body. The front and rear discs are each provided with multiple through riveting holes, and multiple blade fixing teeth can be inserted into the riveting holes; The blade is connected to the front and rear discs by blade fixing teeth passing through the riveting holes from the inside to the outside. After passing through the riveting holes, the two sides of the blade body are respectively attached to the front and rear discs. After they are attached, the front ends of the blade fixing teeth on both sides of the blade body are located on the outer side of the front and rear discs respectively. Then, the blade fixing teeth on the outer side of the front and rear discs are locked to each other with the adjacent outer ends of their corresponding riveting holes. Finally, the riveting and fixing between the blade and the front and rear discs is achieved. After the blades are riveted and fixed to the front and rear discs, an airflow channel is provided between two adjacent blades and the front and rear discs.

2. The impeller for a centrifugal blower with a riveted structure according to claim 1, characterized in that: The multiple blades are arranged perpendicularly to the end faces of the front and rear discs.

3. The impeller for a centrifugal blower with a riveted structure according to claim 2, characterized in that: After the multiple blade fixing teeth on both sides of the blade body pass through the riveting holes from the inside to the outside, the parts of the blade fixing teeth located on the outer side of the front and rear discs are bent and locked to each other with the adjacent outer end face of the corresponding riveting hole, thereby realizing the riveting and fixing of the blade to the front and rear discs.

4. The impeller for a centrifugal blower with a riveted structure according to claim 1, characterized in that: The blade fixing teeth on the blade body have a double-layer structure. After the multiple double-layer blade fixing teeth pass through the riveting holes from the inside to the outside, the double-layer blade fixing teeth are respectively bent and fit together with the adjacent end faces on both sides of the corresponding riveting holes to realize the riveting fixation between the blade and the front plate and the rear plate.

5. The impeller for a centrifugal blower with a riveted structure according to claim 1, characterized in that: The outer ends of the blade fixing teeth are chamfered.

6. The impeller for a centrifugal blower with a riveted structure according to claim 1, characterized in that: After the portion of the blade fixing tooth located on the outer side of the front and rear discs is fitted with the adjacent outer end face of the corresponding riveting hole, the blade fixing tooth is welded and fixed to the adjacent outer end face of the corresponding riveting hole.

7. The impeller for a centrifugal blower with a riveted structure according to claim 1, characterized in that: An air intake hole is provided in the middle of the front disc, and an inlet ring is fixedly provided on the inner circumference of the air intake hole; The rear disc has a limiting support hole in the middle, and a shaft disc is provided inside the limiting support hole. The shaft disc has a through fixing hole in the middle. The shaft disc includes a shaft disc fixing connection section and a shaft disc sealing support section. The shaft disc fixing connection section is located on the inner side of the rear disc and is fixedly connected to the inner side of the limiting support hole on the rear disc. The shaft disc sealing support section is located inside the limiting support hole and fits and seals with the fixing hole. After the shaft disc fixing connection section is fixedly connected to the rear disc, the outermost part of the shaft disc sealing support section extends beyond the outermost position of the rear disc. A reinforcing disc is provided on the outer circumference of the rear disc, which extends beyond the shaft disc sealing support section, and the reinforcing disc is fixedly connected to the rear disc.

8. The impeller for a centrifugal blower with a riveted structure according to claim 7, characterized in that: The shaft plate fixed connecting section, the rear plate and the reinforcing plate are respectively provided with fixing holes, and the shaft plate fixed connecting section, the rear plate and the reinforcing plate are riveted together by rivets passing through the fixing holes.

9. The impeller for a centrifugal blower with a riveted structure according to any one of claims 1-8, characterized in that: The front disc, rear disc, blades, inlet ring, and reinforcing disc are all made of aviation aluminum plate; The thickness of the front disc is 4.5mm ± 0.2mm, the thickness of the rear disc is 6mm ± 0.2mm, the thickness of the blade and the inlet ring is 2mm ± 0.2mm, and the thickness of the reinforcing disc is 3.5mm ± 0.2mm.

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