Mixed flow fan blade

Abstract

The invention discloses a mixed flow fan blade, and belongs to the technical field of fans, the mixed flow fan blade comprises a plurality of curved blades, an integrally formed connecting structure is arranged at the root of each blade, each connecting structure is a hemispherical shell with two open ends, a shaft shell is arranged on the inner side of each connecting structure, and a motor shaft is sleeved with an opening in one end of each shaft shell; a first cavity is formed in the shaft shell, a mounting base is arranged on the inner side of the top end of the connecting structure, a clamping groove is formed in the outer side wall of the mounting base, a clamping block is arranged on the outer side wall of the shaft shell, and the clamping block lifts the mounting base and is mounted in the clamping groove. And the loss of the motor shaft is reduced. By increasing the diameter of the first cavity of the shaft shell, the stress torque of the blades is reduced, and the blades are protected in the horizontal direction and the vertical direction. And a buffer area is provided for reducing sudden fault events such as damage of one blade, so that damage to the motor shaft is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and particularly to a mixed-flow fan blade. Background Art

[0002] When the shape and structural design of existing blades are dealing with complex airflow environments, there are obvious defects in uneven force distribution. From the perspective of the blade edge design, the common blade edge shapes are relatively single and cannot be optimized according to the flow characteristics of the airflow at different parts of the blade. During the rotation of the fan, the airflow flows in from the leading edge. Since the leading edge shape is not conducive to the uniform guidance of the airflow, it is easy to form airflow separation and vortex phenomena on the blade surface. This not only reduces the aerodynamic efficiency of the fan, making the fan consume more energy to achieve the same ventilation volume, increasing energy consumption, but also leads to uneven pressure distribution on the blade surface. At the trailing edge of the blade, due to the disorder of the airflow, it often bears a large local pressure difference, resulting in a large stress concentration at this part of the blade. Being in this stress state for a long time, the blade is extremely prone to structural damage problems such as deformation and cracking, seriously affecting the service life of the blade and the operation reliability of the fan.

[0003] Chinese Patent Publication No.: CN202659570U, Publication Date: January 9, 2013, discloses a patent named axial-flow wind wheel, including a hub and multiple blades. Each of the blades is distributed on the hub at equal or unequal intervals centered on the rotation center axis of the wind wheel; on the blade, there are a blade leading edge, a blade trailing edge, a blade tip, a blade root, a suction surface, and a pressure surface. The blade root is connected to the hub. The suction surface is the leeward surface of the blade, and the pressure surface is located on the windward surface of the blade; its feature is that there is a wing knife on the suction surface. When the wind wheel rotates, the wing knife can apply a flow disturbance effect to the airflow flowing towards the blade tip before the airflow separation occurs, destroying the flow of the boundary layer towards the blade tip to relieve the blade tip separation. The leading edge shape of this blade is not conducive to airflow guidance, and the trailing edge part cannot achieve the function of reducing starting noise. Summary of the Invention

[0004] The present invention provides a mixed-flow fan blade, which optimizes the airflow flow path, reduces the separation and vortex formation of the airflow on the blade surface, improves the aerodynamic efficiency of the fan, and reduces energy consumption. At the same time, the design of the arc-shaped recess is used to reduce the aerodynamic noise of the blade and improve the operation stability of the fan.

[0005] A further object of the present invention is to avoid the direct contact between the blade and the motor shaft by providing a shaft shell with a first cavity, so that the vibration and generated force of the blade do not affect the motor shaft, reducing the loss of the motor shaft.

[0006] A further object of the present invention is to reduce the force moment of the blade by increasing the diameter of the first cavity of the shaft shell, protecting the blade in the horizontal and vertical directions.

[0007] A further object of the present invention is to reduce the damage caused to the motor shaft by sudden failure events such as the damage of one of the blades.

[0008] To achieve the above object, the present invention adopts the following technical solution: A mixed-flow fan blade includes a plurality of curved blades. An integrally formed connection structure is provided at the blade root. The connection structure is a hemispherical shell with both ends open. An axle housing is provided inside the connection structure. One end of the axle housing is open and sleeved on the motor shaft; a first cavity is provided inside the axle housing. A mounting seat is provided on the inner side of the top end of the connection structure. A clamping groove is provided on the outer side wall of the mounting seat. A clamping block is provided on the outer side wall of the axle housing. The clamping block holds up the mounting seat and is installed in the clamping groove.

[0009] Preferably, an integrally formed ring housing is provided at the blade top. The blade has a leading edge and a trailing edge located on the front and rear sides of the fan rotation direction respectively. The ring housing is fixed to the fixed housing below. A dust-proof cover is provided on the bottom surface of the fixed housing, so that it can dust-proof and protect the direction of the blade. The dust-proof cover is provided on the bottom surface of the fixed housing, with the same diameter as the fixed housing and a circular notch in the center for exposing the motor. The motor shaft is provided on the motor central axis on the side far from the dust-proof cover. By providing a ring housing and a fixed housing at the blade top and equipping with a dust-proof cover, it can effectively prevent dust and impurities from entering the blade area, reduce the wear on the blade surface, and extend the service life of the blade. At the same time, the design of the dust-proof cover can also play a certain protective role for the motor, preventing dust accumulation from affecting the motor heat dissipation and operation efficiency.

[0010] Preferably, the leading edge is an upwardly convex arc shape, and an arc-shaped recessed portion is provided at the trailing edge near the outer end. The blade top, blade root, leading edge and trailing edge define the outer edges of the pressure surface and the suction surface, where the leading edge and the trailing edge respectively extend from the blade top to the blade root. The blade top slopes downward from the leading edge to the trailing edge and is provided on the inner wall of the ring housing. The blade root slopes downward from the leading edge to the trailing edge and is provided on the outer wall of the hemispherical connection structure. The leading edge is provided at the top end of the connection structure at the blade root, and the trailing edge is provided at the bottom end of the connection structure at the blade root. Due to the hemispherical shape feature of the connection structure, the leading edge is closer to the central axis of the motor shaft in the horizontal direction. This unique blade edge design can optimize the airflow path, reduce the separation and vortex formation of the airflow on the blade surface, thereby improving the aerodynamic efficiency of the fan and reducing energy consumption. At the same time, the design of the arc-shaped recessed portion can also reduce the aerodynamic noise of the blade to a certain extent and improve the operation stability of the fan.

[0011] Preferably, the rear leaf edge is an upwardly convex arc from the concave part to the leaf root, and the bending curvature of the arc part of the rear leaf edge is greater than that of the arc part of the front leaf edge. This uneven leaf edge curvature design can further optimize the aerodynamic performance of the blade, make the airflow distribution on the blade surface more uniform, reduce the local pressure difference, thereby reducing the vibration amplitude of the blade, enhancing the structural stability of the blade, and further improving the operating efficiency and reliability of the fan.

[0012] Preferably, the ratio of the distance from the inner wall of the shaft housing to the axis of the fan to the horizontal distance from the leaf tip to the axis is 0.25 - 0.26. Since the diameter of the first cavity of the shaft housing is relatively large, the force moment from any point on the blade to the motor shaft becomes smaller, playing a role in protecting the blade. By precisely controlling the proportional relationship between the diameter of the first cavity of the shaft housing and the blade position, the moment received by the blade during operation can be effectively reduced, and the stress intensity of the blade can be decreased, thus providing better protection for the blade in the horizontal and vertical directions, extending the service life of the blade, and also contributing to improving the overall operating stability of the fan.

[0013] Preferably, both the clamping block and the mounting seat are L-shaped, and the bottom surface and the outer side wall of the clamping block and the mounting seat are in contact. The clamping block clamps the clamping groove so that the connection structure is installed on the shaft housing. A downward L-shaped block is closely arranged below the clamping block. The L-shaped clamping block and mounting seat design can provide a more reliable connection method, ensure a firm combination between the connection structure and the shaft housing, and prevent connection loosening due to vibration or impact. At the same time, this structural design can also simplify the installation process, improve the assembly efficiency, and reduce the production cost.

[0014] Preferably, several reinforcing blocks are provided on the mounting seat. The reinforcing blocks are L-shaped and are in contact with the upper surface and the inner side wall of the mounting seat. The several reinforcing blocks are arranged circumferentially along the axis of the motor shaft. By providing L-shaped reinforcing blocks on the mounting seat, the structural strength of the mounting seat can be significantly enhanced, enabling it to better withstand various forces and vibrations generated during the operation of the blade, thereby improving the reliability and stability of the entire fan system and extending the service life.

[0015] Preferably, an extension plate is provided below the outer side of the clamping groove. The extension plate is circular and is arranged on the outer circumference of the shaft housing. The design of the extension plate can increase the structural strength and stability of the shaft housing, and at the same time provide more support points for subsequent installation and connection. In addition, the extension plate can also play a buffering role to a certain extent, reducing the impact of external shocks on the shaft housing and the blade, and further improving the operating reliability of the fan.

[0016] Preferably, a second cavity is provided between the inner wall of the extension plate and the outer wall of the shaft housing. The design of the second cavity can form a buffer area between the shaft housing and the extension plate, further reducing the impact of vibrations and impact forces generated during the operation of the blade on the motor shaft, playing a better shock-absorbing and protecting role, and also contributing to reducing the operating noise of the fan.

[0017] Preferably, reinforcing ribs are connected to the bottom end of the extension plate and the bottom end of the connection structure, and the reinforcing ribs are in contact with the inner side wall of the connection structure. The reinforcing ribs are in the shape of a curved knife. The design of the curved-knife-shaped reinforcing ribs can effectively enhance the connection strength between the connection structure and the extension plate, improve the integrity and stability of the entire blade system. At the same time, the special shape of the reinforcing ribs can also guide the airflow to a certain extent, optimize the aerodynamic performance, and further improve the operating efficiency of the fan.

[0018] Beneficial effects: The present invention provides a mixed-flow fan blade. By providing a shaft housing with a first cavity, direct contact between the blade and the motor shaft is avoided, so that the vibration and the generated force of the blade do not affect the motor shaft, reducing the loss of the motor shaft. By increasing the diameter of the first cavity of the shaft housing, the force moment of the blade is reduced, protecting the blade in the horizontal and vertical directions. In case of a sudden failure event such as the damage of one blade, a buffer zone is provided to reduce the damage to the motor shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the overall structure diagram of the present invention.

[0020] Figure 2 It is the longitudinal sectional view of the present invention.

[0021] Figure 3 It is the structural schematic diagram of the blade structure and the connection structure of the present invention.

[0022] Figure 4 It is the structural schematic diagram of the blade of the present invention.

[0023] Reference numerals: 1: blade; 1.1: blade top; 1.2: blade root; 1.3: leading edge; 1.4: trailing edge; 1.5: recessed part; 2: connection structure; 2.1: mounting seat; 2.2: card slot; 2.3: extension plate; 2.4: second cavity; 2.5: reinforcing rib; 2.6: reinforcing block; 3: shaft housing; 3.1: clamping block; 3.2: first cavity; 4: ring housing; 5: motor; 6: motor shaft; 7: fixed housing; 8: dust cover. DETAILED DESCRIPTION OF THE INVENTION

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] In the modern industrial and civil fields, as an important ventilation device, the performance of the mixed-flow fan directly affects the ventilation effect and the service life of the device. There are some deficiencies in the structural design of traditional mixed-flow fans. For example, the direct contact between the blade 1 and the motor shaft 6 easily causes wear of the motor shaft 6, and the poor force condition of the blade 1 affects its service life. The mixed-flow fan of the present invention effectively solves these problems through a series of structural designs, providing users with a more efficient, stable and reliable ventilation solution.

[0026] As Figure 1 shown, the mixed-flow fan of the present invention mainly consists of several curved blades 1, a connecting structure 2, a shaft housing 3, a motor 5, and related protection and fixing components. The several curved blades 1 are the core components for the fan to achieve the ventilation function. They are connected to the shaft housing 3 through the connecting structure 2, and the shaft housing 3 is sleeved on the motor shaft 6, thus realizing the indirect connection between the blade 1 and the motor shaft 6. At the same time, the fan is also equipped with components such as a ring housing 4, a fixed housing 7, and a dust cover 8 to protect the blade 1 and the motor 5, improving the operating stability and service life of the fan.

[0027] As Figure 1 and Figure 2 shown, at the blade root 1.2 of the blade 1, there is an integrally formed connecting structure 2, and this connecting structure 2 is a hemispherical shell with both ends open. This hemispherical connecting structure 2 design not only reflects the precision in technology but also has multiple functions and advantages, providing important support for the improvement of the overall performance of the fan. First of all, the hemispherical geometric shape can better disperse the forces generated by the blade 1 during operation, avoiding local stress concentration, thereby improving the structural strength and stability of the blade 1. Specifically, when the blade 1 rotates at high speed, it will be subjected to the combined action of the impact force of the air flow, the centrifugal force, and its own gravity. These forces are transmitted to the connecting structure 2 through the blade root 1.2. The hemispherical design enables these forces to be evenly distributed on the entire surface of the connecting structure 2, rather than concentrated at a certain point or area, thus effectively reducing the stress concentration phenomenon and reducing the risk of the blade 1 being damaged due to fatigue or overload.

[0028] When the hemispherical connecting structure 2 is connected to the shaft housing 3, it can provide a more tight and stable connection method, ensuring that the blade 1 will not loosen or fall off during high-speed rotation. The design of the two open ends of the hemispherical shape enables the connecting structure 2 to achieve seamless docking with the shaft housing 3. At the same time, through reasonable fit tolerances and fastening methods, the reliability of the connection is further enhanced. This design not only simplifies the installation process but also improves the connection accuracy and stability, enabling the blade 1 to always maintain a tight fit with the shaft housing 3 during operation, avoiding vibration or failure problems caused by loose connection.

[0029] The hemispherical connection structure 2 also has good torsional resistance and anti-deformation ability. During the operation of the fan, the blade 1 may be impacted by airflows in different directions, causing the connection structure 2 to bear complex torques and bending forces. The hemispherical design can effectively resist these external forces, maintain the shape and functional stability of the connection structure 2, and thus further extend the service life of the blade 1. At the same time, this design can also adapt to the operating requirements under different working conditions. For example, in the case of large wind speed changes or large ambient temperature fluctuations, the hemispherical connection structure 2 can still maintain its stable performance and ensure the normal operation of the fan.

[0030] The design of the hemispherical connection structure 2 not only optimizes the mechanical properties of the blade 1, but also significantly improves the operating reliability and durability of the fan through its unique geometric shape and connection method. This innovative design provides an important technical guarantee for the long-term stable operation of the fan, and also lays a solid foundation for reducing maintenance costs and improving the efficiency of the fan.

[0031] As Figure 2 shown, a shaft housing 3 is provided inside the connection structure 2. One end of the shaft housing 3 is open and sleeved on the motor shaft 6. This design not only realizes the tight connection between the shaft housing 3 and the motor shaft 6, but also ensures that the shaft housing 3 can rotate synchronously with the motor shaft 6, thus guaranteeing the stability of the fan operation. A first cavity 3.2 is provided inside the shaft housing 3. This design is one of the key innovations of the present invention and has important engineering significance and practical value. The existence of the first cavity 3.2 avoids the direct contact between the blade 1 and the motor shaft 6, so that the vibration of the blade 1 and the generated force will not be directly transmitted to the motor shaft 6, thus significantly reducing the loss of the motor shaft 6.

[0032] During the operation of the fan, the blade 1 will inevitably be impacted by the airflow and the centrifugal force generated by its own rotation, thus generating vibration. If the blade 1 is directly connected to the motor shaft 6, these vibrations will directly act on the motor shaft 6, causing the motor shaft 6 to bear additional stress. In the long-term operation, it may cause fatigue damage to the motor shaft 6 and even lead to fan failure. By setting the first cavity 3.2, the vibration energy is absorbed and buffered by the shaft housing 3, effectively protecting the motor shaft 6. Specifically, the first cavity 3.2, as a buffer area, can disperse and absorb the vibration energy generated by the blade 1, avoiding the direct transmission of vibration to the motor shaft 6. This design not only reduces the stress intensity of the motor shaft 6, but also extends the service life of the motor shaft 6. At the same time, it also helps to improve the overall operation stability and reliability of the fan. In addition, the design of the first cavity 3.2 also has a certain flexibility and can adapt to the vibration frequencies and amplitudes under different working conditions, thus further enhancing the adaptability and durability of the fan.

[0033] In practical applications, this design is particularly suitable for high-speed or high-power fans because the vibrations generated by these fans during operation are more significant, and the need to protect the motor shaft 6 is more urgent. Through the buffering effect of the first cavity 3.2, the fan can operate smoothly during high-speed rotation, reducing mechanical losses and noise caused by vibrations, thereby improving the comprehensive performance and service life of the fan. In short, the design of the first cavity 3.2 not only reflects innovation in structure but also provides an important technical guarantee for the long-term stable operation of the fan.

[0034] As Figure 2 shown, an installation seat 2.1 is provided on the inner side of the top end of the connection structure 2. A clamping groove 2.2 is provided on the outer side wall of the installation seat 2.1, and a clamping block 3.1 is provided on the outer side wall of the shaft housing 3. The clamping block 3.1 holds up the installation seat 2.1 and is installed in the clamping groove 2.2. Both the clamping block 3.1 and the installation seat 2.1 are L-shaped, and this L-shaped design can provide a more reliable connection method. The bottom surface and the outer side wall of the clamping block 3.1 and the installation seat 2.1 are in contact, and the clamping block 3.1 clamps the clamping groove 2.2 so that the connection structure 2 is installed on the shaft housing 3. A downward L-shaped block is closely provided below the clamping block 3.1, further enhancing the firmness of the connection. At the same time, a number of strengthening blocks 2.6 are provided on the installation seat 2.1. The strengthening blocks 2.6 are L-shaped and are in contact with the upper surface and the inner side wall of the installation seat 2.1. The number of strengthening blocks 2.6 is arranged along the circumferential direction of the central axis of the motor shaft 6. These strengthening blocks 2.6 can significantly enhance the structural strength of the installation seat 2.1, enabling it to better withstand various forces and vibrations generated by the blade 1 during operation, thereby improving the reliability and stability of the entire fan system.

[0035] A ring shell 4 is integrally formed at the blade tip 1.1 of the blade 1. The blade 1 has a front blade edge 1.3 and a rear blade edge 1.4 located on the front and rear sides of the fan rotation direction respectively. The ring shell 4 is fixed to the fixed outer shell 7 below, and a dust cover 8 is provided on the bottom surface of the fixed outer shell 7. The design of the dust cover 8 can effectively prevent dust and impurities from entering the blade 1 area, reduce the wear on the surface of the blade 1, and extend the service life of the blade 1. At the same time, the dust cover 8 can also play a certain role in protecting the motor 5, preventing dust accumulation from affecting the heat dissipation and operating efficiency of the motor 5.

[0036] As Figure 3 and Figure 4As shown, the leading edge 1.3 is designed as an upwardly convex arc shape. This streamlined structure not only conforms to the principles of aerodynamics but also effectively reduces the resistance generated when the air flow passes through the blade 1, thereby improving the aerodynamic efficiency of the fan. There is an arc-shaped recess 1.5 at the outer end of the trailing edge 1.4. This design can optimize the flow path of the air flow, reduce the air flow separation phenomenon, and further improve the performance of the blade 1. The blade tip 1.1, blade root 1.2, leading edge 1.3, and trailing edge 1.4 jointly define the outer edges of the pressure surface and suction surface. Among them, the leading edge 1.3 and the trailing edge 1.4 extend from the blade tip 1.1 to the blade root 1.2 respectively, forming a complete profile of the blade 1.

[0037] The blade tip 1.1 slopes downward from the leading edge 1.3 to the trailing edge 1.4. This inclined design helps to guide the air flow smoothly through the surface of the blade 1 and reduce the generation of turbulence. The blade tip 1.1 is arranged on the inner wall of the shroud 4, ensuring a tight connection between the blade 1 and the shroud 4 and enhancing the overall structural strength of the blade 1 at the same time. The blade root 1.2 slopes downward from the leading edge 1.3 to the trailing edge 1.4. The blade root 1.2 is arranged on the outer wall of the hemispherical connection structure 2. This design not only makes the transition between the blade 1 and the connection structure 2 smoother but also improves the torsional resistance of the blade 1. The leading edge 1.3 is arranged at the top of the connection structure 2 at the blade root 1.2, while the trailing edge 1.4 is arranged at the bottom of the connection structure 2 at the blade root 1.2. This layout makes the blade 1 more stable during installation and also facilitates the smooth passage of the air flow.

[0038] Due to the hemispherical shape feature of the connection structure 2, the leading edge 1.3 is closer to the central axis of the motor shaft 6 in the horizontal direction. This design not only optimizes the force distribution on the blade 1 but also reduces the radial load on the motor shaft 6 during the operation of the blade 1, thereby extending the service life of the motor shaft 6. In addition, the hemispherical connection structure 2 can effectively disperse the centrifugal force generated when the blade 1 rotates at high speed, further enhancing the stability and reliability of the blade 1. Overall, this blade 1 design not only improves the aerodynamic performance of the fan but also enhances the strength and durability of the blade 1 by optimizing the structural layout, providing a strong guarantee for the long-term stable operation of the fan.

[0039] This unique leaf edge design can optimize the flow path of the air flow, reduce the separation and vortex formation of the air flow on the surface of blade 1, thereby improving the aerodynamic efficiency of the fan and reducing energy consumption. For example, the upward convex arc-shaped design of the front leaf edge 1.3 can guide the air flow to enter blade 1 more smoothly, while the arc-shaped concave part 1.5 of the rear leaf edge 1.4 can change the direction of the air flow to a certain extent, making the distribution of the air flow on the surface of blade 1 more uniform. At the same time, from the concave part 1.5 to the leaf root 1.2 of the rear leaf edge 1.4 is an upward convex arc shape, and the bending curvature of the arc part of the rear leaf edge 1.4 is greater than that of the arc part of the front leaf edge 1.3. This uneven leaf edge curvature design can further optimize the aerodynamic performance of blade 1, make the distribution of the air flow on the surface of blade 1 more uniform, reduce the local pressure difference, thereby reducing the vibration amplitude of blade 1, enhancing the structural stability of blade 1, and further improving the operating efficiency and reliability of the fan.

[0040] As Figure 2 shown, the ratio of the distance from the inner wall of the shaft housing 3 to the central axis of the fan to the horizontal distance from the blade tip 1.1 to the central axis is 0.25 - 0.26. This proportional relationship is obtained through precise calculation and optimized design, aiming to achieve the mechanical balance and operating stability of the fan structure. Since the diameter of the first cavity 3.2 of the shaft housing 3 is relatively large, this structural design makes the moment of force on any point of blade 1 to the motor shaft 6 significantly smaller, thus playing a role in protecting blade 1. By precisely controlling the proportional relationship between the diameter of the first cavity 3.2 of the shaft housing 3 and the position of blade 1, the moment of force on blade 1 during operation can be effectively reduced, and the stress intensity of blade 1 can be decreased, thereby providing better protection for blade 1 in the horizontal and vertical directions, prolonging the service life of blade 1, and also contributing to improving the overall operating stability of the fan. In addition, due to the setting of the first cavity 3.2, the vibration of blade 1 will not be directly transmitted to the motor shaft 6, and the vibration energy of blade 1 can be effectively consumed. The first cavity 3.2 is equivalent to an elastic zone. This design not only reduces the loss of the motor shaft 6 but also improves the anti-vibration performance of the system. If one of the blades 1 is damaged during operation, the operation of blade 1 will be affected, resulting in air flow disorder. However, the first cavity 3.2 provides a buffer zone, making the influence of the vibration of blade 1 in any direction on the motor shaft 6 significantly weakened, thereby protecting the motor 5 from damage. This design not only improves the reliability and durability of the fan but also reduces the maintenance cost, ensuring the long-term stable operation of the fan in a harsh environment.

[0041] As Figure 2As shown, a ring of extension plates 2.3 is provided below the outer side of the card slot 2.2. The extension plates 2.3 are in a circular structure and are closely attached to the outer peripheral side of the shaft housing 3. The design of the extension plates 2.3 not only increases the overall structural strength and stability of the shaft housing 3, but also provides more support points for subsequent installation and connection, making the connection between the shaft housing 3 and other components more firm and reliable. In addition, the extension plates 2.3 can also play a buffering role to a certain extent, reducing the direct impact of external shocks on the shaft housing 3 and the blades 1, thereby further improving the operation reliability and durability of the fan. For example, during the operation of the fan, the external environment may generate sudden shocks or vibrations, and the existence of the extension plates 2.3 can effectively disperse and absorb these external energies, preventing them from damaging the shaft housing 3 and the blades 1.

[0042] A second cavity 2.4 is provided between the inner wall of the extension plate 2.3 and the outer wall of the shaft housing 3. The design of the second cavity 2.4 is another important innovation point of the present invention. It forms a unique buffer area between the shaft housing 3 and the extension plate 2.3. This buffer area can further reduce the influence of the vibration and impact force generated during the operation of the blade 1 on the motor shaft 6, playing a better shock absorption and protection role. Specifically, when the blade 1 rotates at a high speed, due to the impact of the air flow and the centrifugal force, certain vibration energy will be generated. After these vibration energies are transmitted to the shaft housing 3 through the blade 1, the second cavity 2.4 can effectively absorb and disperse these energies, preventing them from directly acting on the motor shaft 6, thereby significantly reducing the stress intensity of the motor shaft 6 and extending its service life.

[0043] The design of the second cavity 2.4 also helps to reduce the operation noise of the fan. During the operation of the fan, vibration and impact force will not only damage the mechanical structure, but also generate relatively large noise. Through the buffering effect of the second cavity 2.4, the vibration energy is effectively absorbed, reducing the possibility of vibration being transmitted to the fan housing, thereby reducing the generation of noise. This design not only improves the operation efficiency of the fan, but also improves the use environment. Especially in application scenarios with high noise requirements, it has important practical significance.

[0044] The design of the extension plates 2.3 and the second cavity 2.4 not only enhances the structural strength and stability of the shaft housing 3, but also significantly improves the operation reliability and durability of the fan through buffering and shock absorption effects. This innovative structural design provides an important technical guarantee for the long-term stable operation of the fan, and at the same time provides an effective solution for reducing operation noise and mechanical loss.

[0045] At the bottom end of the extension plate 2.3 and the bottom end of the connection structure 2, there is a reinforcing rib 2.5 connected. The reinforcing rib 2.5 is in contact with the inner side wall of the connection structure 2. The reinforcing rib 2.5 is in the shape of a curved knife. The design of the curved-knife-shaped reinforcing rib 2.5 can effectively enhance the connection strength between the connection structure 2 and the extension plate 2.3, improving the integrity and stability of the entire blade 1 system. At the same time, the special shape of the reinforcing rib 2.5 can also guide the airflow to a certain extent, optimize the aerodynamic performance, and further improve the operating efficiency of the fan.

[0046] When installing the mixed-flow fan, first, the motor 5 needs to be fixed in a suitable position to ensure that the central axis of the motor shaft 6 is consistent with the designed central axis of the fan. Then, the shaft housing 3 is sleeved on the motor shaft 6, and attention should be paid to the accurate opening direction and position of the shaft housing 3. Next, the integrally formed blade 1 and the connection structure 2 are installed on the shaft housing 3 through the cooperation of the clamping block 3.1 and the clamping groove 2.2 to ensure a firm connection. During the installation process, it is necessary to check whether the installation angle and position of the blade 1 are correct to ensure that the blade 1 does not interfere with other components during rotation. After installing the blade 1, the ring housing 4 is fixed on the fixed housing 7, and then the fixed housing 7 is installed on the main structure of the fan. Finally, the dust-proof cover 8 is installed to ensure good sealing between the dust-proof cover 8, the fixed housing 7, and the motor 5 to prevent dust from entering.

[0047] During the debugging process, first, it is necessary to check whether all components of the fan are firmly installed and the connections are tight. Then, power on the fan and start it to observe the operating conditions of the fan. Check whether the rotation of the blade 1 is stable and whether there are abnormal vibrations or noises. If any abnormal situation is found, the fan needs to be stopped immediately for inspection to find out the problem and make adjustments. At the same time, it is also necessary to check the ventilation effect of the fan and adjust the rotation speed and operating parameters of the fan according to actual needs. During the debugging process, it is necessary to record the operating data of the fan, such as rotation speed, air volume, and air pressure, for subsequent analysis and optimization.

[0048] Obviously, the above embodiments are only examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A mixed flow fan blade, characterized in that: It comprises a plurality of curved blades, wherein the blade roots are provided with an integrally formed hemispherical connection structure, the inner side of the connection structure is provided with a shaft housing, and the shaft housing is provided with a first cavity and one end of the opening is sleeved on the motor shaft; An integrally formed ring shell is provided at the top of the blade, the front blade edge is in an upwardly convex arc shape, the rear blade edge is provided with a recessed portion near the outer end, the rear blade edge is in an upwardly convex arc shape from the recessed portion to the blade root, and the blade top and blade root both tilt downward from the front blade edge to the rear blade edge.

2. A mixed flow fan blade according to claim 1, characterized in that: The connecting structure is a hemispherical shell with openings at both ends, and the blades have a front blade edge and a rear blade edge respectively located at the front and rear sides of the fan rotation direction.

3. A mixed flow fan blade according to claim 2, characterized in that: The curvature of the rear blade edge arc portion is greater than the curvature of the front blade edge arc portion.

4. A mixed flow fan blade according to claim 1 or 2, characterized in that: A mounting seat is arranged on the inner side of the top of the connection structure, a clamping groove is arranged on the outer side wall of the mounting seat, a clamping block is arranged on the outer side wall of the shaft shell, and the clamping block lifts the mounting seat and is installed in the clamping groove.

5. The mixed flow fan blade according to claim 1, characterized in that: The ratio of the distance from the inner wall of the shaft housing to the central axis of the fan to the distance from the blade tip to the central axis in the horizontal direction is 0.25 to 0.

26.

6. The mixed flow fan blade according to claim 1, characterized in that: The blade root is arranged on the outer wall surface of the hemispherical connection structure, the front blade edge is arranged at the top end of the connection structure at the blade root, and the rear blade edge is arranged at the bottom end of the connection structure at the blade root.

7. The mixed flow fan blade according to claim 4, characterized in that: A plurality of reinforcing blocks are arranged on the mounting seat. The reinforcing blocks are L-shaped and contact the upper surface and the inner side wall of the mounting seat.

8. The mixed flow fan blade according to claim 4, characterized in that: An extension plate is arranged below the outer side of the slot, and the extension plate is circular and arranged on the outer periphery of the shaft housing.

9. The mixed flow fan blade according to claim 8, characterized in that: A second cavity is provided between the inner wall of the extension plate and the outer wall of the shaft housing.

10. The mixed flow fan blade according to claim 9, characterized in that: The bottom end of the extension plate and the bottom end of the connection structure are connected with reinforcing ribs, and the reinforcing ribs are in contact with the inner side wall of the connection structure.

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