Fan assembly

Abstract

The draught fan assembly comprises a volute and an impeller, the volute comprises a first side plate, a second side plate, a flow guide plate and an air outlet, the first side plate is provided with an air inlet and a backflow prevention structure, the backflow prevention structure is arranged around the air inlet, the impeller is arranged in the volute, and the flow guide plate is arranged in the impeller. The impeller comprises a plurality of blades, a blade disc and a protective cover, the blades are circumferentially distributed between the blade disc and the protective cover, the thicknesses of the blades are gradually reduced in the radial direction from the inner side to the outer side, the blades are in a tip shape, the two ends of each blade are provided with slits, and the slits are used for dividing airflow. The inner side is the side close to the circle center of the impeller, and the outer side is the side opposite to the inner side. The exhaust pressure of air which flows in from the air inlet and is exhausted through the space between the blades can be increased, noise is reduced, meanwhile, the slits formed in the blades can eliminate a negative pressure area, and running loss of the fan is avoided.

Description

Technical Field

[0001] The present disclosure relates to the technical field of thin fans, and in particular to a fan assembly. Background Art

[0002] In fans, there's a gap between the impeller and the inner plane of the volute, commonly known as the impeller clearance. In thin fans, due to space constraints, some of the air forced into the flow path may flow back through the impeller clearance to the radially inner side of the impeller blades. This phenomenon is known as backflow. Backflow can disrupt the air flow drawn in from the air inlet, affecting fan operation and causing noise. Summary of the Invention

[0003] In order to solve the technical problem that the above-mentioned thin fan is prone to backflow during operation, thereby affecting the normal operation of the fan and causing noise, the present disclosure proposes a fan assembly that can increase the air volume with low noise, eliminate eddy currents, and avoid operating losses of the fan.

[0004] To achieve the above objectives, the present disclosure provides a fan assembly, comprising:

[0005] A volute, the volute comprising a first side panel, a second side panel, a guide plate, and an air outlet, the guide plate being disposed between the first side panel and the second side panel and connected to the air outlet to form an air flow channel having an air outlet channel, the first side panel being provided with an air inlet and a backflow prevention structure, the backflow prevention structure being provided around the air inlet;

[0006] an impeller, the impeller being disposed inside the volute, the impeller comprising blades, a blade disk, and a shroud, wherein a plurality of blades are provided and the blades are circumferentially distributed between the blade disk and the shroud, and gaps between the blades form an air flow channel;

[0007] The thickness of the blade gradually decreases from the inside to the outside in the radial direction, so that the outside of the blade forms a pointed shape. Slits are provided at both ends of the blade, and the slits are used to divert the airflow passing through the blade. The inside is the side adjacent to the center of the impeller, and the outside is the side away from the center of the impeller.

[0008] In a further embodiment, the anti-backflow structure includes a protruding structure, which protrudes from the first side plate toward the interior of the volute, and a groove is formed on the side of the protruding structure adjacent to the air inlet, with the opening of the groove facing the interior of the volute.

[0009] In a further embodiment, the shield includes a curved surface, the curved surface is embedded in the groove, and as the bottom side of the groove gradually goes deeper into the interior of the volute, the gap between the curved surface and the groove gradually narrows.

[0010] In a further embodiment, the slit is in the same radial direction as the blade, and the slit is located inside the blade, so that the slit is located at an upstream portion in the air flow channel.

[0011] In a further embodiment, an arch structure is further provided on the blade, the arch structure is located on the convex surface of the blade, and the arch structure spans the slit located at the third end of the blade, and the third end is the end of the blade adjacent to the air inlet.

[0012] In a further embodiment, the distance between the arched structure and the third end of the blade is greater than the height of the arched structure, and the height of the arched structure is at least 1 / 9 times the height of the impeller.

[0013] In a further embodiment, the width of the slit is at least 1 / 30 times the width of the air flow channel, and the width is less than 1 / 4 the thickness of the air flow channel.

[0014] In a further embodiment, the distance from the center of the impeller to the slit is at least 1.1 times the radius of the impeller, and the angle between the slit and the horizontal direction is between 115 degrees and 138 degrees.

[0015] In a further embodiment, the outer side of the blade is formed by a curved surface, and the uniform curvature radius of the outer side of the blade is greater than 0 and less than or equal to 0.1 mm.

[0016] In a further embodiment, the fan assembly further includes a motor, which is installed between the volute and the impeller to drive the impeller to rotate.

[0017] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0018] The implementation of this disclosure has the following beneficial effects:

[0019] The present invention designs the blades to gradually become thinner from one end to the other in the axial direction to form a sharp edge shape, which can effectively guide the air flowing into the air inlet to pass through the blades and form a higher flow rate and pressure at the exhaust port, thereby increasing the flow rate and speed of the exhaust air and improving the exhaust pressure. The aerodynamic sound waves generated by the blades during operation will be more easily weakened and dissipated, which can reduce the propagation and generation of noise and lower the overall noise level. Slits are also provided at both ends of the blades, which can guide and control the airflow, reduce separation and the generation of vortices, thereby reducing the operating losses of the fan and lowering the noise level.

[0020] Further features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions and advantages of the embodiments of this specification or the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 An assembly diagram of a fan assembly according to an embodiment of the present disclosure is shown;

[0023] Figure 2 An exploded view of a fan assembly according to an embodiment of the present disclosure is shown;

[0024] Figure 3 A schematic cross-sectional view of a fan assembly according to an embodiment of the present disclosure is shown;

[0025] Figure 4 A schematic structural diagram of an impeller according to an embodiment of the present disclosure is shown;

[0026] Figure 5 A top view of a blade according to an embodiment of the present disclosure is shown;

[0027] Figure 6 A schematic structural diagram of a blade according to an embodiment of the present disclosure is shown;

[0028] Figure 7 A detailed schematic diagram of an anti-backflow structure according to an embodiment of the present disclosure is shown.

[0029] Among them: 1. volute; 11. first side plate; 12. second side plate; 13. guide plate; 14. air outlet; 2. impeller; 21. blade; 211. slit; 212. arch structure; 22. blade disk; 23. shield; 3. anti-backflow structure; 31. raised structure; 32. groove. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the embodiments described are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this invention.

[0031] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Various exemplary embodiments, features, and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0033] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0034] The term "and / or" herein simply describes an association relationship between associated objects, indicating that three relationships can exist. For example, "A and / or B" can represent the existence of three situations: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" herein refers to any combination of at least two of any one or more of a plurality of items. For example, "at least one of A, B, and C" can represent any one or more elements selected from the set consisting of A, B, and C.

[0035] In addition, numerous specific details are provided in the following detailed description to better illustrate the present disclosure. Those skilled in the art will appreciate that the present disclosure can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art are not described in detail in order to highlight the main points of the present disclosure.

[0036] Figures 1 to 3 The assembly diagram, exploded diagram and cross-sectional diagram of the fan assembly according to the embodiment of the present disclosure are respectively shown. Figures 1 to 3 As shown, the fan assembly of the embodiment of the present disclosure includes:

[0037] The volute 1 includes a first side panel 11, a second side panel 12, a guide plate 13, and an air outlet 14. The first side panel 11 and the second side panel 12 constitute the two sides of the volute 1 and are the main supporting parts of the volute 1. They can fix and connect other components. The components include main components such as connecting gears, shafts, and worms, which can ensure the stable operation of the entire centrifugal fan. In addition, auxiliary components such as bearings, seals, and lubrication systems may also be included to help improve the performance of the volute 1 and extend the service life of the volute 1. The guide plate 13 is arranged between the first side panel 11 and the second side panel 12, and is connected to the air outlet 14 to form an air flow channel with an air outlet channel. The air outlet 14 can affect the exhaust performance and air volume of the fan. Common connection methods between the first side panel 11, the second side panel 12 and the guide plate 13 include welding, bolting and gluing. In different embodiments, according to specific use requirements and manufacturing conditions, selecting a suitable connection method can ensure the stability, sealing and performance of the volute 1, which is not limited in the embodiments of the present disclosure. The guide plate 13 is used to guide the airflow, and its shape is usually annular, which can make the airflow rotate when passing through the guide plate 13, thereby increasing the kinetic energy of the airflow and improving the efficiency of the fan. The material of the volute 1 is usually a high-strength metal material, such as aluminum alloy or steel. This material can both ensure strength and reduce weight. In some embodiments, the volute 1 can also be made of a suitable material according to actual requirements such as corrosion resistance and mechanical strength, such as thin steel or carbon fiber. An air inlet 111 and an anti-backflow structure 3 are provided on the first side panel 11. The anti-backflow structure 3 is arranged around the air inlet. The anti-backflow structure 3 is usually made of the same material as the volute 1 to ensure the stability and durability of the structure. Through precise manufacturing technology, it can be ensured that the geometric shape and size of the anti-backflow structure 3 meet the design requirements, such as by using CNC cutting, stamping or welding processes.

[0038] The impeller 2 is arranged inside the volute 1. The impeller 2 is usually installed inside the volute 1 through a mounting sleeve or a shaft. The impeller 2 can be set at the center position of the volute 1 to make the airflow evenly distributed in the volute 1 and reduce the influence of centrifugal force on the volute 1. In other embodiments, the impeller 1 can also be set at a position close to the air inlet in the volute 1, close to the air outlet 14, or at an eccentric position in the volute 1. In each specific embodiment, the optimal setting position of the impeller 2 can be determined by performing numerical simulation, experimental verification, etc. It should be noted that during installation, it is necessary to ensure that there is a suitable gap and connection between the impeller 2 and the volute 1 to ensure that the impeller 2 can rotate smoothly during operation and provide efficient output under the required air flow conditions. In addition, the sealing between the impeller 2 and the volute 1 needs to be considered to prevent air leakage. Figure 4 FIG. 1 shows a schematic structural diagram of an impeller according to an embodiment of the present disclosure, as shown in FIG. Figure 4 As shown, the impeller 2 includes blades 21, a blisk 22, and a shroud 23. Multiple blades 21 are provided, and the shape and number of the blades 21 vary depending on the design requirements and application scenarios of the fan. The blades 21 are typically made of metal or composite materials using a specific molding process, such as die-casting, forging, or composite material lamination. The blisk 22 is the supporting structure of the impeller 2. Its main function is to connect the blades 21 together and provide structural stability for the impeller 2. To ensure that the blisk 22 has sufficient strength and rigidity to withstand the rotational force of the blades 21 and the airflow pressure, it is typically made of metal materials through cutting, stamping, or casting. The blades 21 are distributed circumferentially between the blade disk 22 and the shroud 23. The blades 21 can be fixed between the blade disk 22 and the shroud 23 by welding, bolts or other connection methods. The gaps between the blades 21 form air flow channels. The air flows between the blades 21 and can provide power for the impeller 2. It should be noted that the connection and distribution of the blades 21 must be firm and reliable to ensure the stability of the impeller 2 and the reliability of long-term operation.

[0039] Figure 5 FIG. 1 shows a schematic top view of a blade according to an embodiment of the present disclosure, as shown in FIG. Figure 5As shown, the thickness of the blade 21 gradually decreases from the inside to the outside in the radial direction, so that the outside of the blade 21 forms a pointed shape. By gradually thinning the shape, the outside of the blade 21 becomes thinner and forms a sharp edge shape. This shape can reduce turbulent loss during air flow and improve the efficiency of the fan. The thinner outside of the blade 21 can also generate stronger airflow pressure, increase the pressure lift of the fan, and thus increase the amount of air blown. In addition, since the thinner outside of the blade 21 can reduce turbulence and air flow resistance, it can also reduce noise generation.

[0040] Figure 6 A schematic structural diagram of a blade according to an embodiment of the present disclosure is shown in FIG. Figure 6 As shown, slits 211 are provided at both ends of the blade 21. The slits 211 allow air to flow through and utilize the kinetic energy of the blade 21 to increase the kinetic energy of the air flow. The slits 211 are used to divert the airflow passing through the blade 21. The position, size, and shape of the slits 211 should be designed taking into account the airflow characteristics and fluid dynamics principles of the blade 21. By optimizing the structural design of the slits 211, better airflow separation and kinetic energy increase effects can be achieved. The slits 211 can improve the distribution of airflow within the fan, help achieve a more uniform airflow distribution in the entire fan system, reduce energy loss and the generation of vortices, and thus improve the efficiency and performance of the system. The inner side is the side adjacent to the center of the impeller 2, and the outer side is the side away from the center of the impeller 2.

[0041] The present embodiment provides a fan assembly. By designing blades 21 with a specific shape, the blades 21 are configured such that, except for the radially outer portion of the suction surface, the radially outer portion of the suction surface gradually thins from one end to the other in the axial direction, and the radially outer portion of the suction surface gradually thins from the other end to the other end in the axial direction. The outer sides of the blades 21 are formed into a sharp tip shape, which can effectively guide the air flowing into the air inlet through between the blades 21 and form a higher flow rate and pressure at the exhaust port, thereby increasing the flow rate and velocity of the exhaust air and improving the exhaust pressure. Furthermore, the aerodynamic sound waves generated by the blades 21 during operation are more easily weakened and dissipated, which can reduce the propagation and generation of noise and lower the overall noise level. Furthermore, the present embodiment also provides slits 211 on the blades 21. The slits 211 can guide and control the airflow, reduce separation and vortex generation, reduce fan operation losses, and lower noise levels. Therefore, the fan assembly of the present embodiment can be applied in various fields, particularly in wind transmission or exhaust systems that require high efficiency and low noise.

[0042] Figure 7Detailed schematic diagram of the anti-backflow structure according to an embodiment of the present disclosure is shown in FIG. Figure 7 As shown, the anti-backflow structure 3 includes a protruding structure 31, which protrudes from the first side panel 11 toward the inside of the volute 1. It is understandable that the height and width of the protruding structure 31 should be large enough to ensure that the air backflow can be effectively prevented, and the shape and size of the protruding structure 31 can be optimized and adjusted according to specific design requirements. In some embodiments, the protruding structure 31 can be designed in a maze form to form a series of channels, and the air flow needs to pass through multiple curved and contracted paths when passing through to achieve an effective anti-backflow effect. A groove 32 is formed on the side of the protruding structure 31 adjacent to the air inlet, and the opening of the groove 32 faces the inside of the volute 1. The width and depth of the groove 32 should be large enough to allow air to pass smoothly and ensure that the backflowing air cannot pass through the groove 32. In some embodiments, the shape of the groove 32 can be U-shaped or other suitable shapes to prevent air backflow to the greatest extent. Depending on the airflow characteristics and the design requirements of the impeller 2, the shape of the groove 32 can be adjusted, for example by increasing its length or changing its curvature, to improve the flow of air within the volute 1. For example, increasing the length of the groove 32 can change the flow path and streamline length of the airflow within the volute 1. A longer groove 32 provides more space for airflow, allowing it to flow better along the blades 21, thereby increasing the efficiency and performance of the fan. The curvature of the groove 32 can also be adjusted to better suit the airflow characteristics. A smaller curvature allows airflow to flow more smoothly through the groove 32, reducing airflow resistance and loss. A larger curvature can increase the rotational guidance of the airflow within the volute 1, improving the fan's operating efficiency. The combination of the raised structure 31 and the groove 32 prevents air from flowing back from the air inlet into the volute 1, avoiding unnecessary reverse airflow and pressure loss, improving the efficiency and performance of the fan, and ensuring that the airflow direction is consistent with the intended direction during normal operation, without negatively impacting the fan's performance and efficiency.

[0043] like Figure 7As shown, the shield 23 includes a curved surface 231, which is embedded in the groove 32. As the bottom side of the groove 32 gradually penetrates into the interior of the volute 1, the gap between the curved surface 231 and the groove 32 gradually narrows. When air flows from a wider gap through the gradually narrowing gap, the air is compressed and accelerated, resulting in a higher flow rate, thereby increasing the speed and kinetic energy of the air flowing to the impeller 2. By increasing the air flow rate, the efficiency and performance of the fan can be improved. In addition, when the air flows through the gap between the curved surface 231 and the groove 32, it is constrained by the curved surface 231 and the groove 32, and the air is compressed and straightened, which can reduce the disturbance in the airflow. The airflow is released to the surface of the blade 21 in a state where the disturbance has been reduced, thereby reducing noise.

[0044] In a further embodiment, a guide vane or a flow direction adjustment plate can be added inside the shroud 23 or the volute 1 to further control the flow direction and distribution of the airflow. The guide vane can be used to guide the matching of the airflow and the impeller, thereby improving the working efficiency of the impeller 2 and the blade 21; the flow direction adjustment plate can be used to adjust the flow direction of the airflow inside the volute 1 to meet the needs of different working conditions. In the embodiment of the present disclosure, a plane is designed on the top of the blade 21, which is symmetrical to the plane on the shroud 23 connected to the blade 21. Through this plane, the airflow can be smoothly guided to make it flow more smoothly, thereby further reducing the noise generated when the airflow passes through the top of the blade 21. In some embodiments, the shroud 23 may also include an inclined plane, which faces the inner side of the volute 1 and is inclined at a predetermined angle relative to the axis. The inclined plane can make the airflow process smoother, the air is not easy to separate from the internal plane, and can reduce the formation of turbulence and vortex, thereby reducing the generation of noise.

[0045] The slits 211 are oriented radially in the same direction as the blades 21 and are located on the inner side of the blades 21, so that they are located in the upstream portion of the air flow channel. When the fan rotates at high speed, a negative pressure region is generated in each air flow channel at the radially inner portion of the convex surface. Simultaneously, as the blades 21 rotate, kinetic energy is applied to any air flowing along the convex surface of the blades. The slits 211 are located near the inner side of the blades 21, fully utilizing the kinetic energy generated by the rotating blades 21, blowing air into the negative pressure region and reducing energy loss and the generation of vortices. The shape of the slit 211 is usually a straight line or a curve. The specific structure and position of the slit 211 will vary depending on the fan design and can be optimized according to the specific application and performance requirements. For example, the width of the slit 211 can remain relatively constant and be arranged along the inner side of the blade 21, or it can change on the inner side of the blade. For example, the slit 211 can be narrower at the root of the blade 21 and then gradually expand to the tip of the blade 21, so as to achieve a relatively uniform slit density on the blade 21 and produce different airflow distributions and flow rates at different positions.

[0046] like Figure 6 As shown, the blade 21 is also provided with an arch structure 212, and the arch structure 212 is a convex curved shape. Specifically, the arch structure 212 can be of different shapes, such as a circular arc, an elliptical shape or other arcs. The arch structure 212 is located on the convex surface of the blade 21, and the arch structure 212 spans the slit 211 located at the third end of the blade 21, and the third end is the end of the blade 21 adjacent to the air inlet. The arch structure 212 can be provided on the blade 21 by processing the material into the desired shape or by adding materials. The appropriate material is selected according to specific needs. Common materials include metal alloys, such as aluminum alloy or stainless steel, etc. The design of the arch structure 212 can make the detached airflow adhere to the blade 21 again, ensuring the continuity of the airflow at the air inlet, which helps to improve the efficiency and performance of the fan. Since the blades 21 of the present disclosure are slotted to eliminate negative pressure areas, this may weaken the blades 21. During fan operation, the blades 21 are subject to significant centrifugal forces and mechanical stresses. Therefore, providing the arched structure 212 on the blades 21 enhances the structural strength of the blades 21, thereby extending the service life and stability of the blades 21. Furthermore, the presence of the arched structure 212 alters the airflow path and velocity distribution, enhancing the control and guidance of the airflow on the blades 21 and improving the performance and efficiency of the fan.

[0047] The distance between the arched structure 212 and the third end of the blade 21 is greater than the height of the arched structure 212, and the height of the arched structure 212 is at least 1 / 9 times the height of the impeller 2. By limiting the distance between the arched structure 212 and the third end of the blade 21, the arched structure 212 can be prevented from being too high and obstructing the flow of airflow, ensuring that the airflow can flow freely at the third end of the blade 21 without being interfered with by the excessively high arched structure 212. The coordinated structure of the arched structure 212 and the slit 211 takes into account the special conditions of the air intake area of ​​the impeller 2. The slit 211 eliminates the negative pressure area and promotes the convergence of airflow, thereby improving the efficiency and performance of the fan. At the same time, by limiting the height range of the arched structure 212 from the third end of the blade 21, the smooth movement of the airflow can be ensured, avoiding unnecessary interference and obstruction.

[0048] The width of the slit 211 is at least 1 / 30 times the width of the air flow channel, and the width is less than 1 / 4 of the thickness of the air flow channel. The width of the air flow channel represents the distance or size of the air flow channel in the lateral direction, that is, the width of the gap between the blades 21. The width affects the smoothness and flow rate of the air flow. The thickness represents the distance or size of the air flow channel in the longitudinal direction, that is, the distance from the convex surface to the concave surface of the blade 21. The thickness determines the capacity and flow rate of the air flow channel. By controlling the width of the slit 211 and ensuring that the slit 211 is small enough, it is possible to limit excessive air from passing through the slit 211 into the negative pressure area, thereby improving the air drive efficiency of the fan and reducing energy loss. At the same time, it is possible to avoid the slit 211 being too wide, so that excessive air enters the negative pressure area through the slit 211, increasing the turbulence and vortex formation of the air flow, and causing noise. Therefore, by controlling the width of the slit 211 , the generation of noise can be reduced and the noise control effect of the fan can be improved.

[0049] The distance from the center of the impeller 2 to the slit 211 is at least 1.1 times the radius of the impeller 2, which ensures that when the impeller 2 is in operation, the airflow can pass smoothly through the slit 211, avoiding airflow blockage or poor airflow distribution, thereby affecting the performance of the fan. The angle between the slit 211 and the horizontal direction is between 115 degrees and 138 degrees. This angle can eliminate the negative pressure area and reduce the phenomenon of reverse flow or vortex flow of airflow generated near the slit 211. For ultra-thin fans, the range of the angle is limited to 115°<α<138°, ensuring that the slit 211 can effectively guide the external airflow into the negative pressure area and achieve better airflow control and guidance effects within a certain range, which helps to improve the efficiency of the fan and reduce noise and vibration.

[0050] The outer side of the blade 21 is formed by a curved surface, and the uniform curvature radius of the outer side of the blade 21 is greater than 0 and less than or equal to 0.1 mm. The outer side of the blade 21 is designed with a smaller thickness, which can reduce the resistance and turbulence of the airflow, thereby reducing noise and increasing static pressure. By designing the outer side of the blade 21 as a curved surface and controlling the uniform curvature radius of the outer side, uniform airflow can be achieved through the change of curvature, ensuring the fluidity of the blade 21 and the uniformity of the airflow distribution, helping to maintain the stability and smooth flow of the airflow, reducing turbulence and separation, thereby reducing noise. At the same time, it can also improve the fluidity of the airflow, reduce energy loss, increase the exhaust static pressure of the fan at the moment of 10m1 / min air volume, and improve the working performance of the fan.

[0051] The fan assembly also includes a motor, which is installed between the volute 1 and the impeller 2 to drive the impeller 2 to rotate. Commonly used motors include AC motors and DC motors. The motor is usually tightly connected to the back or bottom of the impeller 2 by bolts or other fixing devices, and is connected to the impeller 2 by the motor shaft, which can ensure a stable installation and transmit the rotational force of the motor. When the motor is started and running, it will rotate the impeller 2, thereby generating air flow. The selection and installation method of the motor will vary according to the specific fan design and application requirements. For example, the power and speed of the motor need to match the size and design requirements of the impeller 2. The motor is usually powered by a power supply and is started, stopped and adjusted by an electronic control system, which can achieve efficient and controllable air flow to meet the needs of different application scenarios.

[0052] While various embodiments of the present disclosure have been described above, the foregoing description is intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A fan assembly, characterized in that: include: A volute (1), the volute (1) comprising a first side plate (11), a second side plate (12), a guide plate (13) and an air outlet (14), the guide plate (13) being arranged between the first side plate (11) and the second side plate (12) and connected to the air outlet (14) to form an air flow channel having an air outlet channel, the first side plate (11) being provided with an air inlet and a backflow prevention structure (3), the backflow prevention structure (3) being arranged around the air inlet; An impeller (2), the impeller (2) being arranged inside the volute (1), the impeller (2) comprising blades (21), a blade disk (22) and a shroud (23), a plurality of blades (21) being provided, and the blades (21) being circumferentially distributed between the blade disk (22) and the shroud (23), and gaps between the blades (21) forming an air flow channel; The thickness of the blade (21) gradually decreases from the inner side to the outer side in the radial direction, so that the outer side of the blade (21) forms a pointed shape. Slits (211) are provided at both ends of the blade (21), and the slits (211) are used to divert the airflow flowing through the blade (21). The inner side is the side adjacent to the center of the impeller (2), and the outer side is the side away from the center of the impeller (2).

2. The fan assembly according to claim 1, characterized in that The backflow prevention structure (3) includes a protruding structure (31), the protruding structure (31) protruding from the first side plate (11) toward the interior of the volute (1), and a groove (32) is formed on a side of the protruding structure (31) adjacent to the air inlet, with an opening of the groove (32) facing the interior of the volute (1).

3. The fan assembly according to claim 2, characterized in that: The shield (23) includes a curved surface (231), the curved surface (231) is embedded in the groove (32), and as the bottom side of the groove (32) gradually goes deeper into the interior of the volute (1), the gap between the curved surface (231) and the groove (32) gradually narrows.

4. The fan assembly according to claim 1, characterized in that The slit (211) has the same radial direction as the blade (21), and the slit (211) is located inside the blade (21), so that the slit (211) is located in the upstream portion of the air flow channel.

5. The fan assembly according to claim 1, characterized in that: The blade (21) is also provided with an arched structure (212), the arched structure (212) being located on the convex surface of the blade (21), and the arched structure (212) spans the slit (211) located at a third end portion of the blade (21), the third end portion being an end of the blade (21) adjacent to the air inlet.

6. The fan assembly according to claim 5, characterized in that: The distance between the arched structure (212) and the third end of the blade (21) is greater than the height of the arched structure (212), and the height of the arched structure (212) is at least 1 / 9 times the height of the impeller (2).

7. The fan assembly according to claim 1, characterized in that: The width of the slit (211) is at least 1 / 30 times the width of the air flow channel, and the width is less than 1 / 4 the thickness of the air flow channel.

8. The fan assembly according to claim 1, characterized in that The distance from the center of the impeller (2) to the slit (211) is at least 1.1 times the radius of the impeller (2), and the angle between the slit (211) and the horizontal direction is between 115 degrees and 138 degrees.

9. The fan assembly according to claim 1, characterized in that: The outer side of the blade (21) is formed by a curved surface, and the uniform curvature radius of the outer side of the blade (21) is greater than 0 and less than or equal to 0.1 mm.

10. The fan assembly according to claim 1, characterized in that It also includes a motor, which is installed between the volute (1) and the impeller (2) and is used to drive the impeller (2) to rotate.

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