Centrifugal fan blade

Abstract

The utility model discloses a centrifugal fan blade, which belongs to the technical field of centrifugal fan blades and comprises a circular bottom plate and a mounting shaft welded at the center of the circular bottom plate, the inside of the mounting shaft is of a hollow structure and is axially protruded along the central axis of the circular bottom plate, and a plurality of external blades are arranged on the outer side of the mounting shaft. The multiple outer blades are annularly arranged at intervals along the mounting shaft, meanwhile, a first extension shell and a second extension shell are mounted on the outer sides of the outer blades, and airflow separation is reduced through streamline design of the first extension shell and the second extension shell. The external blades and the internal blades are mounted on the mounting shaft, airflow can be dispersed, airflow impact can be reduced and the noise level can be reduced through the design of the double-layer blades, the internal blades can play a certain acoustic shielding role, noise generated by interaction between the airflow and the blades is reduced, and meanwhile the sawtooth edges are arranged on the internal blades and the external blades, so that the noise is reduced. A laminar flow boundary layer of the airflow is converted into turbulent flow earlier, and vortex separation and noise generation caused by unstable waves are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fan blades, and specifically relates to a centrifugal fan blade. Background Technique

[0002] The existing centrifugal fan blades generally include a turntable. On one side of the turntable, a number of blades are evenly spaced around the center of the turntable. The blades are arc-shaped and curved. During use, the turntable is connected to a motor. Driven by the motor, the turntable rotates, driving a number of blades to rotate, so that the gas in the center flows towards the outer periphery of the turntable.

[0003] For example, in the Chinese Patent Library, the utility model patent with the publication number CN217129907U discloses a centrifugal fan blade, which solves the problems of the existing centrifugal fan blade having a complex structure and a large noise when the centrifugal fan blade rotates at a high speed. This centrifugal fan blade includes a circular bottom plate. In the middle of one side surface of the circular bottom plate, there is an installation part protruding along the axial direction of the circular bottom plate. A through shaft hole is axially opened on the end surface of the installation part along the axial direction of the circular bottom plate. On one side surface of the circular bottom plate, there are a number of blades. All the blades are arranged at intervals around the circumference of the installation part. The blades are arc-shaped, and a notch is opened at the inner end of the blade. This structure simplifies the structure of the centrifugal fan blade and reduces the noise when the centrifugal fan blade rotates at a high speed.

[0004] In the prior art, the blades are set to be arc-shaped and a notch is opened at the inner end of the blade, which simplifies the structure of the centrifugal fan blade and reduces the noise when the centrifugal fan blade rotates at a high speed. However, opening a notch at the inner end of the blade easily leads to unstable air flow, generating turbulence and vortices, thereby increasing the noise, and at the same time reducing the structural strength of the blade. Especially when rotating at a high speed, the blade may be deformed or broken. Content of the Utility Model

[0005] Aiming at the above-mentioned existing technical deficiencies, the purpose of the present utility model is to provide a centrifugal fan blade, which has certain advantages in reducing noise and enhancing the service life of the blade.

[0006] To solve the above technical problems, the present utility model adopts the following technical solutions: It includes a circular bottom plate and a mounting shaft welded at the center of the circular bottom plate. The inside of the mounting shaft is a hollow structure and protrudes axially along the central axis of the circular bottom plate. A number of external blades are arranged on the outside of the mounting shaft. The number of external blades is arranged at intervals along the circumference of the mounting shaft. At the same time, a first extension shell and a second extension shell are installed on the outside of the external blades. The first extension shell and the second extension shell reduce air flow separation through streamline design.

[0007] Preferably, an internal blade is installed on the mounting shaft inside the external blade. Both the internal blade and the external blade are curved.

[0008] Preferably, the inner blades and the outer side frames of the outer blades of the centrifugal fan blade are both provided with serrated edges.

[0009] Preferably, the bottoms of the first extension shell and the second extension shell are both engaged with the slots provided on the upper surface of the circular bottom plate, and a sealing ring with notches on both sides is provided on the outer frame of the slot.

[0010] Preferably, symmetrical fixing plates are provided on both sides of the first extension shell and the second extension shell, and arc grooves are opened on the fixing plates. When the first extension shell and the second extension shell are attached, the arc grooves on the two fixing plates form a ring.

[0011] Preferably, the clamping plate is clamped in the two fitted arc grooves, and the pad arranged on the upper side of the clamping plate is fixed to the circular bottom plate by bolts.

[0012] Preferably, sealing holes are provided on both sides of the first extension shell, and sealing columns are provided on both sides of the second extension shell, and the sealing columns are plug-fitted with the sealing holes.

[0013] Preferably, a plurality of heat dissipation holes are formed on the lower sides of the first extension shell and the second extension shell.

[0014] Preferably, a mesh plate is provided inside the heat dissipation hole.

[0015] Preferably, a sound insulation layer is provided on the inner sides of the first extension shell and the second extension shell.

[0016] 1. The beneficial effect of the utility model is that by installing the outer blades and the inner blades on the mounting shaft, the double-layer blade design can disperse the airflow, reduce the airflow impact, and thus reduce the noise level. The inner blades can play a certain acoustic shielding role, reducing the noise generated by the interaction between the airflow and the blades. At the same time, serrated edges are provided on the inner and outer blades to convert the laminar boundary layer of the airflow into turbulent flow earlier, thereby avoiding vortex separation and noise generation caused by unstable waves. Secondly, the inner blades can be used as part of the supporting structure to improve the stability of the entire device and reduce vibration. The double-layer blade design helps to better distribute the load, reduce the stress concentration of a single blade, and prevent blade breakage.

[0017] 2. The beneficial effects of the utility model are as follows: by adding a streamlined first extension shell and a second extension shell on the outside of the inner and outer blades, the separation of the airflow near the two extension shells is reduced, the generation of vortices is reduced, the airflow passes through the two extension shells more smoothly, the noise is reduced, and at the same time, the inner and outer blades are protected from the influence of the external environment, their service life is extended, the structural strength of the circular bottom plate is increased, the overall stability is improved, and circular heat dissipation holes are opened on the lower sides of the first extension shell and the second extension shell, and the positions of the heat dissipation holes are staggered with the positions of the blades to assist the internal heat dissipation of the centrifugal fan blades. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a three-dimensional schematic diagram of a housing of a centrifugal fan blade provided by an embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the overall structure split of an embodiment of the present invention.

[0021] Figure 3 It is a side view schematic diagram of a circular bottom plate and a blade structure in an embodiment of the present invention.

[0022] Figure 4 It is a partial schematic diagram of the structures of a first extension shell and a second extension shell in an embodiment of the present invention.

[0023] Figure 5 For an embodiment of the present invention Figure 4 Schematic diagram of the structure at position A.

[0024] Figure 6 It is a schematic diagram of the structure of a clamping plate in an embodiment of the present invention.

[0025] Figure 7 It is a schematic diagram of the split structures of a first extension shell and a second extension shell in an embodiment of the present invention.

[0026] Figure 8 It is a plan view schematic diagram of the structure of a first extension shell in an embodiment of the present invention.

[0027] Description of the Reference Numerals:

[0028] 1 - Circular bottom plate; 2 - Mounting shaft; 3 - External blade; 4 - Internal blade; 5 - Serrated edge; 6 - Card slot; 7 - Sealing ring; 8 - First extension shell; 9 - Second extension shell; 10 - Fixed plate; 11 - Arc groove; 12 - Pad plate; 13 - Clamping plate; 14 - Bolt; 15 - Sealing column; 16 - Heat dissipation hole; 17 - Mesh plate; 18 - Sealing hole; 19 - Sound insulation layer. Detailed Description of the Invention

[0029] Next, in combination with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1

[0031] As Figures 1 to 3 shown, the present invention provides a centrifugal fan blade, including a circular bottom plate 1 and a mounting shaft 2 welded at the center of the circular bottom plate 1. The inside of the mounting shaft 2 is a hollow structure and axially protrudes along the central axis of the circular bottom plate 1. A plurality of external blades 3 are arranged on the outside of the mounting shaft 2, and the plurality of external blades 3 are arranged at intervals along the circumference of the mounting shaft 2. At the same time, internal blades 4 are installed on the mounting shaft 2 inside the external blades 3. Both the internal blades 4 and the external blades 3 are curved. The design of the double-layer blades can disperse the airflow, reduce the airflow impact, and thus reduce the noise level.

[0032] At the same time, the internal blades 4 can play a certain acoustic shielding role and reduce the noise generated by the interaction between the airflow and the blades.

[0033] Sawtooth edges 5 are provided on the internal blades 4 and the external blades 3 to convert the laminar boundary layer of the airflow into a turbulent flow earlier, thereby avoiding vortex separation and noise generation caused by unstable waves.

[0034] Embodiment 2

[0035] As Figures 4 to 8 shown, a first extension shell 8 and a second extension shell 9 are installed on the outside of the external blades 3. The first extension shell 8 and the second extension shell 9 reduce airflow separation through a streamlined design, reduce the generation of eddy currents, enable the airflow to pass through the first extension shell 8 and the second extension shell 9 more smoothly, and reduce noise.

[0036] In addition, sound insulation layers 19 are provided on the inner sides of the first extension shell 8 and the second extension shell 9 to reduce the reflection and transmission of sound.

[0037] The bottoms of the first extension shell 8 and the second extension shell 9 are both in snap-fit connection with a card slot 6 opened on the upper surface of the circular bottom plate 1. A sealing ring 7 with notches on both sides is provided on the outer side frame of the card slot 6, so that the first extension shell 8 and the second extension shell 9 can be disassembled, facilitating the repair of the internal structure. At the same time, the sealing ring 7 is used to seal the outside of the two extension shells, improving the sealing performance and stability during their installation.

[0038] Furthermore, symmetric fixing plates 10 are provided on both sides of the first extension shell 8 and the second extension shell 9. Arc grooves 11 are formed in the fixing plates 10. When the first extension shell 8 and the second extension shell 9 are attached to each other, the arc grooves 11 on the two fixing plates 10 form a ring. At this time, the backing plate 12 with a ring-shaped clamping plate 13 is placed on the upper side of the arc grooves 11, so that the clamping plate 13 is clamped in the two arc grooves 11, and then the backing plate 12 is fixed to the circular bottom plate 1 by bolts 14, and thus the first extension shell 8 and the second extension shell 9 can be installed.

[0039] Furthermore, sealing holes 18 are formed on both sides of the first extension shell 8, and sealing columns 15 are provided on both sides of the second extension shell 9. When the first extension shell 8 and the second extension shell 9 are attached to each other, the sealing columns 15 are inserted into and cooperate with the sealing holes 18, improving the stability and sealing performance during the installation of the two extension shells.

[0040] Meanwhile, considering that heat is likely to be generated inside after the first extension shell 8 and the second extension shell 9 wrap the blades, to solve this problem, a plurality of heat dissipation holes 16 are formed on the lower sides of the first extension shell 8 and the second extension shell 9. The heat dissipation holes 16 are of a circular structure, and their positions are staggered from the positions of the internal blades 4 and the external blades 3, not only avoiding the situation of interfering with the operation of the blades, but also maximizing the auxiliary heat dissipation inside the device.

[0041] A mesh plate 17 is arranged inside the heat dissipation holes 16, which can prevent other objects from entering the interior through the heat dissipation holes 16.

[0042] Embodiment 3

[0043] As Figure 3 shown, the internal blades 4 can be used as part of the support structure, improving the stability of the entire device, reducing vibration. At the same time, the design of the double-layer blades helps to better distribute the load, reduce the stress concentration on a single blade, and prevent the blade from breaking.

[0044] The first extension shell 8 and the second extension shell 9 protect the internal blades 4 and the external blades 3 from the influence of the external environment, extending their service life. At the same time, the structural strength of the circular bottom plate 1 is increased, improving the overall stability.

[0045] Obviously, those skilled in the art can make various changes and deformations to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these changes and deformations.

Claims

1. A centrifugal fan blade, comprising a circular bottom plate and a mounting shaft welded at the center of the circular bottom plate, characterized in that: The interior of the mounting shaft is a hollow structure and protrudes axially along the central axis of the circular base plate. A plurality of external blades are arranged on the outside of the mounting shaft. The plurality of external blades are arranged in a ring-shaped manner along the mounting shaft. A first extension shell and a second extension shell are installed on the outside of the external blades. The first extension shell and the second extension shell reduce airflow separation through a streamlined design.

2. A centrifugal fan blade as claimed in claim 1, characterized in that: The inner blades are mounted on the mounting shaft located inside the outer blades, and both the inner blades and the outer blades are curved.

3. A centrifugal fan blade as claimed in claim 2, characterized in that: The inner blades and the outer side frames of the outer blades of the centrifugal fan blade are both provided with serrated edges.

4. A centrifugal fan blade as claimed in claim 3, characterized in that: The bottoms of the first extension shell and the second extension shell are both engaged with the slots provided on the upper surface of the circular bottom plate, and a sealing ring with notches on both sides is provided on the outer frame of the slot.

5. A centrifugal fan blade as claimed in claim 4, characterized in that: Symmetrical fixing plates are disposed on both sides of the first extension shell and the second extension shell. Arc grooves are formed on the fixing plates. When the first extension shell and the second extension shell are attached to each other, the arc grooves on the two fixing plates form a ring.

6. A centrifugal fan blade as claimed in claim 5, characterized in that: The clamping plate is clamped in the two fitting arc grooves, and the pad arranged on the upper side of the clamping plate is fixed on the circular bottom plate by bolts.

7. A centrifugal fan blade as claimed in claim 6, characterized in that: Sealing holes are provided on both sides of the first extension shell, and sealing columns are provided on both sides of the second extension shell. The sealing columns are plugged into and matched with the sealing holes.

8. A centrifugal fan blade as claimed in claim 7, characterized in that: A plurality of heat dissipation holes are formed on the lower sides of the first extension shell and the second extension shell.

9. A centrifugal fan blade as claimed in claim 8, characterized in that: A mesh plate is arranged inside the heat dissipation hole.

10. A centrifugal fan blade as claimed in claim 9, characterized in that: Sound insulation layers are disposed on the inner sides of the first extension shell and the second extension shell.

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