Centrifugal fan impeller

Abstract

The utility model discloses a centrifugal fan impeller relates to fluid pump field. Including bottom plate and top plate, be equipped with the blade between bottom plate and top plate, the blade outer edge of blade is inclined to right, bottom plate is equipped with the bottom plate arch of lower convex structure, the center of top plate is equipped with top plate opening, the inside of top plate opening is equipped with the opening vertical board with blade connection, the blade inner edge of blade is connected with the both sides of top plate through top plate contact part. Through the mode of interference fit rather than the installation of connecting piece, the impeller of the utility model can be produced through the mode of injection molding integrated, and the production cost can be reduced through the mode of injection molding, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of fluid pumps, specifically to a centrifugal fan impeller. Background Technology

[0002] Traditional centrifugal fan blades are made of metal and are typically manufactured through machining. This process is slow, costly, and their performance may be excessive for low-load environments. Furthermore, additional machining is required after the blades are formed because additional components are needed to secure the motor rotor.

[0003] For example, the "ternary impeller assembly, centrifugal fan, and range hood" disclosed in announcement number "CN222936961U" can achieve dual-sided dual-suction function by setting two symmetrical impellers. However, its size and structure are large, and the space for mounting with the motor is also large. In addition, it is difficult to process, has a complex structure, and is not conducive to one-piece injection molding. Utility Model Content

[0004] The purpose of this invention is to provide a centrifugal fan impeller that can be integrally injection molded. Another purpose is to achieve a right-leaning, inwardly curved three-dimensional shape at the air outlet, reducing air intake impact loss and boundary layer separation at the outlet, while simultaneously improving the overall static pressure efficiency of the impeller. A further purpose is to increase the connection area between the blades and the top plate by connecting the inner edge of the blades to both sides of the top plate through the contact portion, thereby improving the connection strength and the load-bearing capacity of the impeller.

[0005] This utility model achieves the above-mentioned technical objectives through the following technical means: A centrifugal fan impeller includes a base plate and a top plate. Blades are provided between the base plate and the top plate. The outer edge of the blades is inclined to the right. The base plate has a convex bottom plate arch. The top plate has a top plate opening at its center. An opening vertical plate is provided on the inner side of the top plate opening and connected to the blades. The inner edge of the blades is connected to both sides of the top plate through a top plate contact part.

[0006] Furthermore, an arched opening is provided at the highest point of the arched base plate, and a rotor mounting ring is vertically provided in the arched opening.

[0007] Preferably, the outer edge of the blade is connected to the bottom plate and the top plate, the outer edge of the blade is arc-shaped, and the radius R1 of the outer edge of the blade is between 70cm and 75cm.

[0008] Furthermore, the angle α between the inner edge of the blade and the projection of the diameter of the arched opening onto the vertical plane ranges from 95° to 100°.

[0009] Furthermore, the two contact surfaces between the blade and the top plate are the bottom surface of the top plate and the inner side surface of the opening vertical plate, respectively.

[0010] Furthermore, the vertical height of the contact portion between the top plate and the opening vertical plate is greater than half the height of the opening vertical plate, but less than the height of the opening vertical plate.

[0011] Preferably, the straight-line distance b between the outermost part of the connection position between two adjacent blades and the base plate, i.e., the end of the connection position between the outer edge of the blade and the base plate, is between 90cm and 100cm.

[0012] Furthermore, the straight-line distance 'a' between the innermost edge of the blade and the end of the connection point between the blade and the base plate is between 50cm and 60cm.

[0013] Furthermore, the outer and inner edges of the blades are arranged in a counterclockwise ring on the base plate at equal intervals.

[0014] Preferably, the rotor mounting ring is installed with an interference fit to the motor rotor.

[0015] This utility model has the following beneficial effects: By using an interference fit instead of a connecting part for installation, the impeller of this invention can be produced by injection molding, which reduces production costs and improves production efficiency. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention from one perspective.

[0017] Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another perspective.

[0018] Figure 3 This is a top view of the structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the structure of the main view of this utility model.

[0020] In the diagram, 1-base plate, 11-base plate arch, 12-rotor mounting ring, 13-motor mounting platform, 14-arched opening, 2-blade, 21-inner edge of blade, 22-outer edge of blade, 23-top plate contact part, 3-top plate, 31-opening vertical plate, 32-top plate opening, 4-air inlet. Detailed Implementation

[0021] Example 1: like Figures 1 to 4As shown, a centrifugal fan impeller includes a base plate 1 and a top plate 3, with blades 2 disposed between the base plate 1 and the top plate 3. The base plate 1 has a centrally located arched opening 14, and the top plate 3 has a centrally located top opening 32. The centers of the arched opening 14 and the top opening 32 are located on the same axis. A rotor mounting ring 12, made of metal, is disposed inside the arched opening 14. The rotor mounting ring 12 and the arched opening 14 are fixed together during the injection molding of the centrifugal fan impeller.

[0022] The base plate 1 is provided with a base plate arch 11. The structure of the base plate arch 11 is a frustum side surface with a convex waist. A motor mounting platform 13 is provided at the innermost and uppermost end of the base plate arch 11. The motor mounting platform 13 is provided with an arch opening 14 and a rotor mounting ring 12.

[0023] The outer edge 22 of the blade 2 is inclined to the right and has an arc-shaped structure. The outer edge 22 and the inner edge 21 of the blade form a continuous curved surface structure. The upper and lower sides of the blade 2 are in contact with the bottom plate 1 and the top plate 3. The bottom plate arch 11 of the bottom plate 1 forms an upward arched chamber at the bottom of the centrifugal fan impeller. Therefore, when the motor and impeller are installed, part of the motor volume can be placed in the chamber, reducing the overall volume of the motor and impeller after installation, making the overall centrifugal fan structure more compact. This allows the fan to be installed and applied in more scenarios.

[0024] An air inlet 4 is provided between two adjacent blades 2. The outer opening of the air inlet 4 is larger, and the inner opening is smaller. The lower end face structure of the air inlet 4 is a continuous surface of the truncated cone portion with a downward convex shape at the waist of the base plate arch 11. In this embodiment, there are seven blades 2, dividing the truncated cone portion of the base plate arch 11 into seven equal parts of the bottom end face structure of the air inlet 4.

[0025] The top plate 3 has a top plate opening 32 at its center. An opening vertical plate 31 is located on the inner side of the top plate opening 32 and connects to the blade 2. The inner edge 21 of the blade 2 is connected to the top plate 3 via a top plate contact part 23. The top plate opening 32 is the outlet of the centrifugal impeller fan. When the fan rotates, air enters from the air inlet 4, gathers at the motor mounting platform 13 at the highest point of the center of the arch 11 of the bottom plate, and flows upwards out through the top plate opening 32. The top plate contact part 23 is located at the top of the inner edge 21 of the blade 2, and the inner annular wall of the top plate opening 32 is fixedly connected to the top plate contact part 23.

[0026] A motor mounting platform 13 is provided at the highest point of the arch 11 of the base plate. An arched opening 14 is provided in the middle of the motor mounting platform 13, and a rotor mounting ring 12 is vertically provided in the inner wall of the arched opening 14. The bottom of the inner edge 21 of the blade is connected to the base plate 1 on the arch 11 of the base plate. The diameter of the top plate opening 32 is larger than the diameter of the arched opening 14. The diameter of the arched opening 14 is 1.5 to 2 times the diameter of the top plate opening 32.

[0027] Both the outer edge 22 and the inner edge 21 of the blade are fixedly connected to the base plate 1 and the top plate 3. The outer edge 22 of the blade is a right-sloping arc shape, and its radius R1 ranges from 70cm to 75cm. An air inlet 4 is formed between two adjacent blades 2. The width and area of ​​the air inlet 4 at the outer edge 22 of the blade are relatively large, and the horizontal distance between two adjacent outer edges 22 of the blade is between 90cm and 100cm. The air inlet 4 is located at the end position, that is, at the position of the inner edge 21 of the blade, and the opening width of the air inlet 4 ranges from 50cm to 60cm.

[0028] Compared to the opening size of the air inlet 4 at the outer edge 22 of the blade, the opening size of the air inlet 4 at the inner edge 21 of the blade is much smaller. Therefore, when air is drawn in from the outer edge 22 of the blade at the air inlet 4, the size of the flow space is constantly decreasing, and thus the gas velocity is constantly increasing. At the inner edge 21 of the blade, the cross-sectional area is reduced to a minimum. When the gas leaves the blade 2, because the diameter of the top plate opening 32 is larger than the diameter of the arched opening 14, an inverted conical chamber is formed at the openings of the top plate 3 and the bottom plate 1, in which the gas flows upward from the smaller end with a smaller cross-sectional area to the larger end with a larger cross-sectional area.

[0029] On the same blade 2, the outer edge 22 to the inner edge 21 of the blade curves in a counterclockwise direction. In this embodiment, seven blades are arranged at equal intervals between the bottom plate 1 and the top plate 3.

[0030] Example 2: The fan structure in this embodiment is the same as that in Embodiment 1. The assembly and operation process of the fan impeller of this utility model are further described.

[0031] like Figures 1 to 4As shown, a centrifugal fan impeller includes a base plate 1 and a top plate 3, with blades 2 disposed between the base plate 1 and the top plate 3. The base plate 1 has a centrally located arched opening 14, and the top plate 3 has a centrally located top opening 32. The centers of the arched opening 14 and the top opening 32 are located on the same axis. A rotor mounting ring 12, made of metal, is disposed inside the arched opening 14. The rotor mounting ring 12 and the arched opening 14 are fixed together during the injection molding of the centrifugal fan impeller.

[0032] The base plate 1 is provided with a base plate arch 11. The structure of the base plate arch 11 is a frustum side surface with a convex waist. A motor mounting platform 13 is provided at the innermost and uppermost end of the base plate arch 11. The motor mounting platform 13 is provided with an arch opening 14 and a rotor mounting ring 12.

[0033] The outer edge 22 of the blade 2 is inclined to the right and has an arc-shaped structure. The outer edge 22 and the inner edge 21 of the blade form a continuous curved surface structure. The upper and lower sides of the blade 2 are in contact with the bottom plate 1 and the top plate 3. The bottom plate arch 11 of the bottom plate 1 forms an upward arched chamber at the bottom of the centrifugal fan impeller. Therefore, when the motor and impeller are installed, part of the motor volume can be placed in the chamber, reducing the overall volume of the motor and impeller after installation, making the overall centrifugal fan structure more compact. This allows the fan to be installed and applied in more scenarios.

[0034] An air inlet 4 is provided between two adjacent blades 2. The outer opening of the air inlet 4 is larger, and the inner opening is smaller. The lower end face structure of the air inlet 4 is a continuous surface of the truncated cone portion with a downward convex shape at the waist of the base plate arch 11. In this embodiment, there are seven blades 2, dividing the truncated cone portion of the base plate arch 11 into seven equal parts of the bottom end face structure of the air inlet 4.

[0035] The top plate 3 has a top plate opening 32 at its center. An opening vertical plate 31 is located on the inner side of the top plate opening 32 and connects to the blade 2. The inner edge 21 of the blade 2 is connected to the top plate 3 via a top plate contact part 23. The top plate opening 32 is the outlet of the centrifugal impeller fan. When the fan rotates, air enters from the air inlet 4, gathers at the motor mounting platform 13 at the highest point of the center of the arch 11 of the bottom plate, and flows upwards out through the top plate opening 32. The top plate contact part 23 is located at the top of the inner edge 21 of the blade 2, and the inner annular wall of the top plate opening 32 is fixedly connected to the top plate contact part 23.

[0036] A motor mounting platform 13 is provided at the highest point of the arch 11 of the base plate. An arched opening 14 is provided in the middle of the motor mounting platform 13, and a rotor mounting ring 12 is vertically provided in the inner wall of the arched opening 14. The bottom of the inner edge 21 of the blade is connected to the base plate 1 on the arch 11 of the base plate. The diameter of the top plate opening 32 is larger than the diameter of the arched opening 14. The diameter of the arched opening 14 is 1.5 to 2 times the diameter of the top plate opening 32.

[0037] Both the outer edge 22 and the inner edge 21 of the blade are fixedly connected to the base plate 1 and the top plate 3. The outer edge 22 of the blade is a right-sloping arc shape, and its radius R1 ranges from 70cm to 75cm. An air inlet 4 is formed between two adjacent blades 2. The width and area of ​​the air inlet 4 at the outer edge 22 of the blade are relatively large, and the horizontal distance between two adjacent outer edges 22 of the blade is between 90cm and 100cm. The air inlet 4 is located at the end position, that is, at the position of the inner edge 21 of the blade, and the opening width of the air inlet 4 ranges from 50cm to 60cm.

[0038] Compared to the opening size of the air inlet 4 at the outer edge 22 of the blade, the opening size of the air inlet 4 at the inner edge 21 of the blade is much smaller. Therefore, when air is drawn in from the outer edge 22 of the blade at the air inlet 4, the size of the flow space is constantly decreasing, and thus the gas velocity is constantly increasing. At the inner edge 21 of the blade, the cross-sectional area is reduced to a minimum. When the gas leaves the blade 2, because the diameter of the top plate opening 32 is larger than the diameter of the arched opening 14, an inverted conical chamber is formed at the openings of the top plate 3 and the bottom plate 1, in which the gas flows upward from the smaller end with a smaller cross-sectional area to the larger end with a larger cross-sectional area.

[0039] On the same blade 2, the outer edge 22 to the inner edge 21 of the blade curves in a counterclockwise direction. In this embodiment, seven blades are arranged at equal intervals between the bottom plate 1 and the top plate 3.

[0040] Because this invention features a base plate arch 11 at the base plate 1, a portion of the motor rotor overlaps with the impeller's mounting space, reducing the overall mounting size and saving space. The core mounting component of the impeller is the metal rotor mounting ring 12 located on the motor mounting platform 13 at the highest point of the base plate arch 11 at its bottom center. This metal ring is an insert that is fixedly bonded to the impeller body during the injection molding process.

[0041] Align the end of the motor rotor, i.e., the motor shaft, with the center hole of the rotor mounting ring 12 at the bottom of the impeller. Because the base plate arches 11 to form an upward cavity, part of the motor housing can be embedded in this cavity, making the entire fan assembly structure more compact.

[0042] The design employs an interference fit mounting method. This means that the inner diameter of the rotor mounting ring 12 is precisely designed to be slightly smaller than the outer diameter of the motor rotor shaft. During installation, specialized tools such as a press are required, along with cooling the motor rotor to cause it to shrink, applying stable axial pressure to press the motor rotor into the rotor mounting ring 12.

[0043] After being pressed in, the elasticity of the metal ring and the rigidity of the rotor shaft generate enormous radial pressure and friction, forming a strong connection. This connection method eliminates the need for additional screws, keys, or adhesives, simplifying the assembly process, ensuring high coaxiality, and reducing vibration and noise during high-speed rotation.

[0044] Once the assembled fan is powered on, the motor drives the impeller to rotate at high speed. Its working process is as follows: As the impeller rotates at high speed, the air inside is thrown outward and upward under the action of centrifugal force, thus forming a negative pressure zone in the air intake area of ​​the impeller.

[0045] External air is drawn in through the air inlet 4, the space between the blades 2 and the outer periphery of the impeller, under atmospheric pressure. Figure 3 It can be seen that the inlet of the air intake channel is wider and the distance b between the outer edges of the adjacent blades is larger, which is conducive to the smooth and large-volume intake of air.

[0046] After the air enters the curved flow channel formed by the bottom plate 1, the top plate 3 and two adjacent blades 2, it is immediately subjected to the action of the high-speed rotating blades.

[0047] The blades convert the mechanical energy of the motor into the kinetic and pressure energy of the air. On one hand, centrifugal force pushes the air toward the center outlet of the impeller; on the other hand, the specially designed three-dimensional curved blades 2 accelerate and pressurize the airflow.

[0048] Air moves along an upward-curving flow channel that narrows from a larger width gap at the outer edges 22 of adjacent blades to a smaller width gap at the inner edges 21 of adjacent blades. The arcuate surface of the base plate arch 11 plays a major guiding role, directing the airflow from radial intake to axial discharge, reducing airflow impact losses and flow dead zones.

[0049] After acceleration and pressurization, the airflow converges at the center of the impeller and is discharged at high speed and vertically upward from the top plate opening 32.

[0050] The vertical plate 31 located inside the top plate opening 32 not only enhances the structural strength of the top plate, but also acts as a guide grid, which helps to regulate the exhaust airflow and reduce the vortex at the outlet, thereby converting more kinetic energy into effective static pressure and improving the static pressure efficiency of the entire impeller.

[0051] The angle α between the inner edge of the blade and the arched opening is set to a range of 95°-100°. This can significantly reduce boundary layer separation and ensure smooth airflow through the impeller.

[0052] This centrifugal fan impeller, through its one-piece injection-molded structure and interference fit with the motor rotor, achieves advantages such as low production cost, simple assembly, and compact structure. During operation, its optimized three-dimensional blades, arched base plate, and outlet design with flow guiding function can efficiently draw air in from the outside, pressurize and guide it through the internal flow channel, and finally discharge it stably from the central axis, maintaining a high static pressure efficiency.

Claims

1. A centrifugal fan impeller, characterized in that, It includes a base plate (1) and a top plate (3). A blade (2) is provided between the base plate (1) and the top plate (3). The outer edge (22) of the blade (2) is inclined to the right. The base plate (1) is provided with a bottom plate arch (11) with a convex structure. The top plate (3) has a top plate opening (32) at its center. An opening vertical plate (31) is provided on the inner side of the top plate opening (32) and connected to the blade (2). The inner edge (21) of the blade (2) is connected to both sides of the top plate (3) through the top plate contact part (23).

2. A centrifugal fan impeller according to claim 1, characterized in that, An arched opening (14) is provided at the highest point of the arched bottom plate (11), and a rotor mounting ring (12) is vertically provided in the arched opening (14).

3. A centrifugal fan impeller according to claim 1, characterized in that, The outer edge (22) of the blade is connected to the bottom plate (1) and the top plate (3). The outer edge (22) of the blade is arc-shaped, and the radius R1 of the outer edge (22) of the blade is between 70cm and 75cm.

4. A centrifugal fan impeller according to claim 2, characterized in that, The angle α between the inner edge (21) of the blade and the diameter of the arched opening (14) on the vertical plane ranges from 95° to 100°.

5. A centrifugal fan impeller according to claim 1, 2, 3, or 4, characterized in that, The two contact surfaces of the blade (2) and the top plate (3) are the bottom surface of the top plate (3) and the inner side surface of the opening vertical plate (31), respectively.

6. A centrifugal fan impeller according to claim 5, characterized in that, The vertical height of the contact portion between the top plate contact portion (23) and the opening vertical plate (31) is greater than half the height of the opening vertical plate (31) and less than the height of the opening vertical plate (31).

7. A centrifugal fan impeller according to claim 1, characterized in that, The straight-line distance b between the outermost part of the connection position between two adjacent blades (2) and the base plate (1), i.e. the end of the connection position between the outer edge (22) of the blade and the base plate (1), is between 90cm and 100cm.

8. A centrifugal fan impeller according to claim 1, 2, 3, 4, 6, or 7, characterized in that, The straight-line distance a between the innermost side of the connection position between two adjacent blades (2) and the base plate (1), i.e. the end of the connection position between the inner edge (21) of the blade and the base plate (1), is between 50cm and 60cm.

9. A centrifugal fan impeller according to claim 1, 2, 3, 4, 6, or 7, characterized in that, The outer edge (22) and inner edge (21) of the blade (2) are arranged counterclockwise on the base plate (1) in an equally spaced ring.

10. A centrifugal fan impeller according to claim 2, characterized in that, The rotor mounting ring (12) is installed with an interference fit to the motor rotor.

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