Air duct fitting and wind power tool

Abstract

The utility model relates to a kind of air duct fittings for wind power tool and the wind power tool comprising the fitting.The air duct fitting is arranged at one end of air duct, including support and multiple rib strip arranged on support and constitute grid.The core improvement is that the thickness of the rib strip is gradually changed along the airflow direction.This unique structure effectively optimizes the flow state when airflow passes through the grid, significantly reduces the local vortex, turbulence intensity and the energy loss accompanied by due to the impact of rib strip and sharp turning, that is, significantly reduces the air inlet resistance.The stabilization of airflow reduces the intensity of aerodynamic noise source due to airflow disturbance.Therefore, the utility model can effectively reduce the overall working noise of wind power tool under the premise that airflow flow meets the use demand, improve working environment.

Description

Technical Field

[0001] This utility model relates to the field of wind power tools, and in particular to a wind duct accessory and a wind power tool. Background Technology

[0002] With increasing awareness of environmental protection and public health, wind-powered tools (such as garden wind-powered tools), widely used in landscaping and cleaning industries, are seeing their noise and performance requirements gradually become a focus of market attention. Garden wind-powered tools are not only used in home gardens, streets, and parks, but are also widely used in commercial and municipal sectors. Their main function is to use strong airflow to blow and remove fallen leaves, garbage, and other debris.

[0003] However, as these devices become more widely used, the requirements regarding their noise and performance have gradually become more stringent. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, this utility model provides a duct accessory and a wind power tool to increase air intake, increase wind speed and reduce working noise.

[0005] This utility model provides a duct accessory, which is disposed at one end of the duct of a wind-powered tool, and the duct accessory includes:

[0006] support;

[0007] Multiple ribs are provided, and the multiple ribs are arranged on the support to form a grid for airflow.

[0008] The thickness of the ribs gradually changes along the airflow direction.

[0009] In one embodiment of this utility model, the thickness of the rib increases and then decreases from back to front along the airflow direction.

[0010] In one embodiment of the present invention, at least one surface of the rib is a smooth curved surface, and the smooth curved surface undulates along the airflow direction.

[0011] In one embodiment of the present invention, both sides of the rib are smooth curved surfaces.

[0012] In one embodiment of the present invention, the curvature of the smooth surface gradually changes from one end of the rib in the airflow direction to the other end.

[0013] In one embodiment of the present invention, the two side surfaces of the rib are symmetrical about a first symmetry plane, the first symmetry plane is parallel to the airflow direction, and the two ends of the rib in the airflow direction are located on the first symmetry plane.

[0014] In one embodiment of the present invention, the rib includes a head and a tail, the junction of the head and the tail is the thickest part of the rib, and the thickness change rate of the head in the airflow direction is greater than that of the tail in the airflow direction.

[0015] In one embodiment of this utility model, the direction from the tail to the head is opposite to the airflow direction.

[0016] In one embodiment of this utility model, the direction from the tail to the head is the airflow direction.

[0017] In one embodiment of the present invention, the rib is symmetrical about a second symmetry plane, the second symmetry plane is perpendicular to the airflow direction, and the rib is located at the middle of the airflow direction on the second symmetry plane.

[0018] In one embodiment of the present invention, the ribs are arranged in an alternating pattern on the support to form a honeycomb grid.

[0019] This utility model also provides a wind-powered tool, including:

[0020] ontology;

[0021] Duct components are installed on the main body;

[0022] A wind power generating unit is disposed in the duct assembly to generate airflow within the duct assembly;

[0023] An air inlet hood is installed at the air inlet end of the duct assembly;

[0024] The air inlet shroud includes a support frame and multiple ribs. The multiple ribs are arranged on the support frame to form a grid through which airflow passes. The thickness of the ribs gradually changes along the airflow direction.

[0025] The beneficial effects of this utility model are as follows: The air duct accessory and wind power tool proposed in this utility model effectively optimize the state of airflow inflow and flow through the grille by designing the thickness of the ribs constituting the grille in the air duct accessory to gradually change along the airflow direction. This special structure can reduce the intensity of local eddies and turbulence when the airflow passes through the grille, reduce the energy loss caused by airflow impact and sharp turning, and thus significantly reduce the air intake resistance. The smooth flow of air reduces the intensity of aerodynamic noise sources caused by disturbances, thereby enabling the air duct accessory of this utility model to effectively reduce the overall operating noise of the wind power tool while ensuring airflow, and improve the usage environment. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0027] In the attached diagram:

[0028] Figure 1 This is a schematic diagram of the structure of a wind-powered tool provided in an embodiment of the present invention;

[0029] Figure 2 This is a three-dimensional structural diagram of the air duct accessory provided in one embodiment of the present utility model;

[0030] Figure 3 This is a front structural diagram of the air duct accessory provided in one embodiment of the present utility model;

[0031] Figure 4 This is one embodiment. Figure 3 Sectional view of plane AA;

[0032] Figure 5 yes Figure 4 Enlarged view of part B;

[0033] Figure 6 This is a schematic diagram of the cross-section of the reinforcing bar provided in Embodiment 2 of this utility model;

[0034] Figure 7 This is a schematic diagram of the cross-section of the reinforcing bar provided in Embodiment 3 of this utility model.

[0035] The attached figures are labeled as follows:

[0036] 1. Body; 2. Duct assembly; 3. First symmetry plane; 4. Second symmetry plane; 5. Air inlet hood; 10. Bracket; 20. Rib; 21. Head; 22. Tail. Detailed Implementation

[0037] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0038] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0039] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0040] With increasing awareness of environmental protection and public health, wind-powered tools (such as garden wind tools) are becoming increasingly important equipment for landscaping, street and public area cleaning. The noise level and efficiency of their operation are becoming a focus of market and user attention. These tools utilize high-speed, powerful airflow to blow and remove fallen leaves, garbage and other debris, and are widely used in home gardens, streets, parks, as well as in the daily operations of commercial and municipal departments.

[0041] However, as the usage of these devices continues to increase, societal demands for noise control and performance optimization are becoming increasingly stringent. A key element in achieving noise reduction and efficiency improvement lies in the optimized design of the air duct system, particularly the performance of the air intake section, which has a decisive impact on overall efficiency and noise levels. The industry recognizes that effectively solving this problem cannot rely solely on simply expanding the air intake area. The more crucial challenge lies in maximizing air intake efficiency within a limited structural space—that is, fully utilizing the limited area to ensure low-resistance, smooth, and stable airflow into the duct. Optimized duct design not only effectively improves airflow efficiency but also significantly reduces operating noise at its source.

[0042] In existing technologies, traditional air intake structures, especially the ribs that form the core framework of the airflow channel, are often designed with a simple rectangular cross-section. This geometry presents significant hydrodynamic defects. When airflow passes through these rectangular ribs with sharp edges and vertical walls, it is prone to severe flow separation on the rib surface (especially at the windward edge), forming a large-scale turbulent vortex region. This undesirable flow pattern causes vortices to consume energy, hindering the smooth passage of the mainstream airflow. At the same time, additional power is required to overcome drag. The severe airflow separation, vortex generation, and breaking are significant sources of aerodynamic noise, directly leading to increased overall machine operating noise.

[0043] Therefore, the traditional rectangular cross-section rib design, in principle, does not conform to the basic laws of fluid dynamics, becoming a bottleneck restricting duct efficiency and noise control. The market urgently needs an innovative duct (especially rib) structural design that can overcome this fluid dynamics defect, achieve better aerodynamic performance within a limited space, and thus achieve the dual goals of simultaneously improving duct efficiency and effectively reducing overall machine noise.

[0044] Please see Figures 1-7 , Figures 2-4 The air duct accessory provided in one embodiment of this utility model is disposed at one end of the air duct of a wind-powered tool, which may be a hair dryer, a blower / vacuum cleaner, a vacuum cleaner, or other similar tools. The air duct accessory includes a bracket 10 and ribs 20.

[0045] The bracket 10 serves as the basic frame structure for the ductwork accessory, providing mechanical support, rigidity, and installation positioning. Specifically, the bracket 10 adopts a ring-shaped frame structure, that is, a closed ring with a certain thickness and strength (which can be circular, near-circular, polygonal, etc., depending on the shape of the duct interface). The bracket 10 may be designed with connection interfaces (such as bolt holes, snap-fit ​​structures, etc.) to reliably and accurately fix the entire ductwork accessory to one end of the duct assembly 2. Multiple ribs 20 are directly connected (e.g., by welding, integral injection molding, riveting, adhesive bonding, etc.) to the inner wall of the ring-shaped frame.

[0046] like Figure 3 As shown, multiple ribs 20 are provided, and these ribs 20 are arranged on the support 10 to form a grid for airflow. Specifically, the ribs 20 are arranged in an alternating pattern on the support 10 to form a honeycomb grid. This arrangement helps to evenly distribute airflow, preventing the formation of local eddies or stagnation in certain areas, thereby improving airflow flow and efficiency. The advantage of the honeycomb structure is that it maximizes the use of limited space, improves the ventilation performance of the duct, and effectively controls the direction and stability of airflow, avoiding sudden changes or disturbances in airflow, which helps to reduce airflow noise.

[0047] like Figures 4-7 As shown, the thickness of the rib 20 is along the airflow direction ( Figures 4-7The thickness of the ribs 20 gradually changes along the airflow direction (X-direction). This means the thickness is not uniform but gradually varies along the airflow direction. This gradually changing thickness design is similar to a blade structure, a fluid dynamic optimization design. The thickness variation of the blade helps guide the airflow smoothly, reducing airflow turbulence and noise generation. If the thickness of the ribs 20 changes too abruptly, the airflow will change drastically as it passes through, forming turbulence or local vortices, leading to airflow instability and increased noise. The gradually changing thickness design allows for a smooth airflow transition, reducing unnecessary airflow turbulence and noise generated by turbulence. In this design, the ribs 20 act like miniature blades, guiding the airflow and preventing violent impacts or turbulence when the airflow enters or leaves the duct fittings. Therefore, this blade-like structure not only improves airflow efficiency but also effectively reduces noise.

[0048] like Figures 4-7 As shown, in one embodiment of this utility model, the thickness of the rib 20 increases and then decreases from back to front along the airflow direction. The front end in the airflow direction is the air outlet of the blowpipe, and the rear end is the air inlet. This forms a structure that is thick in the middle and thin at both ends. This structure can effectively reduce the overall volume of the rib 20 while maintaining a certain thickness at both ends. Because the thickness at both ends of the rib 20 is thinner, the resistance of the rib 20 is reduced, and the airflow at the air inlet is increased, thereby improving the efficiency of airflow. In the air inlet area, due to the reduced thickness at both ends, the airflow entry is smoother, reducing the local airflow resistance of the rib 20. This design helps the airflow enter the air duct at a higher speed, improving the wind speed and airflow of the wind-powered tool.

[0049] With improved airflow stability at the duct fittings, noise sources are effectively controlled. The gradually varying thickness in the design helps ensure a smooth airflow transition, avoiding abrupt changes in speed or direction, thus significantly reducing high-frequency noise caused by airflow interference.

[0050] At the same time, because the airflow is smoother, the noise caused by air pressure changes in the air duct is reduced, especially the sudden airflow caused by encountering obstacles when entering the air duct, which further reduces the generation of noise.

[0051] The thicker design in the middle section helps improve the rigidity and stability of the rib 20, preventing structural deformation or resonance that may occur when the rib 20 is operating at high wind speeds. The reduced thickness at both ends not only helps optimize the airflow path but also reduces the overall weight of the structure to some extent, improving the portability and operational stability of the equipment.

[0052] like Figures 4-7As shown in one embodiment of this invention, at least one surface of the rib 20 is a smooth curved surface (meaning the surface of the rib 20 without sharp edges and with smooth, continuous transitions), and the smooth curved surface undulates along the airflow direction. This structural feature is not simply a gradual change in thickness; it further optimizes the local morphology of the rib 20 surface through hydrodynamics. The continuous undulating curved surface eliminates any sharp edges or plateaus that could cause abrupt separation of the airflow, allowing the airflow to flow extremely smoothly along the surface of the rib 20, minimizing the occurrence of boundary layer separation. The smooth, continuous curved surface, conforming to the airflow direction, guides the airflow to gently turn along a carefully designed path, avoiding localized small-scale vortices and severe turbulence caused by airflow stripping on or behind the rib 20 surface, which are important sources of high-frequency noise. Because the airflow adheres more tightly to the curved surface, the additional pressure drag (form drag) and frictional drag caused by airflow separation are reduced, resulting in less energy loss when the airflow passes through the grid. The undulating surface acts like a deflector, helping to guide and regulate the airflow passing through the ribs 20, further improving the overall intake efficiency and stability of the duct fittings. The smooth surface reduces local pressure fluctuations and cavitation effects when the airflow interacts with the solid surface, directly reducing noise caused by surface disturbances.

[0053] Specifically, such as Figures 4-7 As shown, both sides of the rib 20 are smooth curved surfaces. This means that when airflow passes through the rib 20, the contact surfaces above and below it are continuous, smooth, and streamlined guiding surfaces, forming a highly optimized double streamlined structure. The curved surfaces on both sides completely eliminate any possible sharp corners or straight walls, forcing the airflow to achieve gentle acceleration or deflection guidance when approaching the rib 20 from any direction. The curved surfaces on both sides exert a symmetrical constraint and guiding effect on the airflow around the rib 20, which can precisely regulate the streamline shape and velocity distribution of the space flowing through both sides of the rib 20, so that a highly ordered, symmetrical, and uniform flow field pattern is formed inside the honeycomb grid, significantly reducing the intensity of turbulent pulsations.

[0054] Specifically, such as Figures 4-6As shown, the smooth surface gradually changes curvature (a physical quantity describing the degree of curvature of the surface; the greater the curvature, the sharper the bend, and vice versa) from one end of the rib 20 in the airflow direction to the other. This means that the change in surface geometry is not a simple arc or abrupt turn, but a precisely matched design based on the pressure and velocity environment faced by the airflow at different positions of the rib 20. The continuous change in curvature (such as gradually transitioning from a smaller radius of curvature to a larger radius of curvature, or vice versa) can accurately match the pressure gradient and velocity distribution naturally formed when the airflow passes through different sections of the rib 20. This "adaptive" surface shape guides the airflow to smoothly change direction and velocity. The gradual curvature avoids localized, abrupt acceleration or deceleration sections (these areas would generate sudden pressure changes and local vortices). It makes the changes in airflow velocity and pressure continuous and gradual.

[0055] In one embodiment of this utility model, as Figures 4-7 As shown, the two side surfaces of the rib 20 are symmetrical about a first symmetry plane 3, which is parallel to the airflow direction. The two ends of the rib 20 in the airflow direction are located on the first symmetry plane 3. This symmetry ensures that the airflow obtains a consistent, predictable, low-turbulence path regardless of the minute angle at which it passes through the rib 20. Gradual curvature changes (e.g., a gradual increase in curvature followed by a smooth transition) match the velocity variations of the airflow as it passes through different sections of the rib 20.

[0056] In one embodiment of this utility model, as Figures 4-6As shown, the rib 20 includes a head 21 and a tail 22. The junction of the head 21 and the tail 22 is the thickest part of the rib 20. The thickness change rate (the increase or decrease in thickness per unit length) of the head 21 in the airflow direction is greater than that of the tail 22 in the airflow direction. The thickness of the rib 20 can be the same at both ends in the airflow direction, that is, the cross-section of the rib 20 is approximately teardrop-shaped (referring to a symmetrical streamlined structure with a rounded and full shape, a smooth and converging front end, and a slowly tapering rear end). During the movement of air, the resistance encountered is significantly reduced, thereby effectively reducing the noise during machine operation. The teardrop-shaped profile is a low-resistance form in fluid dynamics. Its rounded head 21 can guide the airflow to accelerate around the surface very smoothly, avoiding flow separation (the phenomenon of airflow detaching from the surface of an object to form vortices). The gradually thinning design of the tail section 22 significantly reduces or even eliminates the adverse pressure gradient (the pressure rise region that hinders fluid flow), maximally delaying or suppressing airflow separation at the tail section 22, thereby reducing form drag (the drag caused by the pressure difference due to the object's shape) to an extremely low level. The teardrop profile and optimized thickness variation rate fundamentally suppress the conditions for airflow stripping to form violent vortices (fluid masses that deviate from the mainstream rotation) and strong turbulence (highly irregular, disordered fluid motion). Since aerodynamic noise (noise generated by fluid flow, disturbances, and the interaction of objects) mainly originates from vortex shedding, turbulent pulsations, and sudden changes in surface pressure, this design significantly reduces the intensity and frequency range of such noise by creating an extremely stable flow field, directly resulting in noise reduction during equipment operation. The retained maximum thickness area in the middle section provides the necessary structural rigidity and strength, effectively resisting the risks of vibration and potential resonance (violent vibration caused when the system's natural frequency matches the external force frequency) caused by high-speed airflow. At the same time, the consistent thickness at both ends and the rounded shape allow the ribs 20 to be arranged compactly and densely, optimizing the grid's layout efficiency within a limited space.

[0057] like Figure 5 As shown in Embodiment 1, the direction from the tail 22 to the head 21 is opposite to the airflow direction. That is, the teardrop-shaped head 21 faces the opposite direction to the airflow. This configuration follows the conventional design concept of classic streamlined objects (shapes with low drag that reduce fluid flow resistance). Here, the smooth head 21 can guide the airflow to disperse and flow close to the surface very smoothly. The gradually narrowing tail 22 can effectively delay boundary layer separation (the phenomenon of low-speed airflow layers close to the surface detaching from the object surface due to insufficient kinetic energy), significantly weaken the size and intensity of the wake vortex (the rotating vortex region formed behind the object due to airflow separation), thereby significantly reducing form drag (the drag caused by fluid pressure difference due to shape) and reducing the generation of turbulence (highly irregular, turbulent fluid motion). It is suitable for a wide range of wind speeds, especially emphasizing low flow resistance and flow stability, reducing aerodynamic noise at the source.

[0058] like Figure 6 As shown in Embodiment 2, the direction from the tail 22 to the head 21 is the airflow direction. That is, the teardrop-shaped head 21 faces the same direction as the airflow. This design can be adopted for wind-powered tools with low airflow speeds.

[0059] like Figure 7 As shown in Embodiment 3, the rib 20 is symmetrical about the second symmetry plane 4, which is perpendicular to the airflow direction. The rib 20 is located at the middle of the airflow direction on the second symmetry plane 4. That is, the cross-section of the rib 20 is approximately elliptical (a standard closed curve with completely symmetrical curvature and continuously varying curvature). The continuous smooth surface of the ellipse (without sharp corners or inflection points) and the moderate curvature variation (neither too flat nor too sharp) match the physical requirements for maintaining a stable boundary layer (a thin layer of airflow moving close to the surface of the rib 20) and attached flow (airflow adhering closely to the surface without separation). This makes the airflow around the rib 20 extremely smooth and gentle, almost completely eliminating flow separation (the phenomenon of airflow detaching from the object surface) triggered by local geometric abrupt changes or drastic pressure changes. Therefore, the two main noise sources, large-scale periodic shedding vortices (regular rotating airflow clusters) and strong pulsating turbulence (intense irregular airflow disturbances), are effectively suppressed at the source. The symmetrical shape of the ellipse can create highly uniform and symmetrical gap channels within a limited space (when the multi-ribbed 20-grid arrangement is used). As the airflow passes through these channels, it undergoes a highly consistent acceleration and expansion process, significantly reducing local high-speed jets, secondary flows, and the resulting intense turbulent mixing noise (noise caused by the shearing of high-speed and low-speed fluids). The overall turbulence intensity (an indicator of the severity of airflow pulsation) is significantly reduced.

[0060] like Figure 1 As shown, this utility model also provides a wind-powered tool, including a body 1, a duct assembly 2, a wind-generating unit, and an air inlet shroud 5.

[0061] The main body 1 refers to the main support structure and outer shell of the wind power tool. It forms the basic frame of the equipment, used to install, integrate, and protect other core functional components (such as motors, switches, battery / power interfaces, etc.), and usually also serves as the grip or support part for the user during operation.

[0062] Duct assembly 2 refers to the airflow channel system installed on the main body 1. It defines the flow path of airflow from the entry point to the final output, and is the main structural part that guides and constrains the airflow. Its internal space is through which the airflow is driven by the wind generation unit.

[0063] The wind power generation unit refers to the core power source located inside the duct assembly 2, typically including a drive motor and an impeller (wind wheel) assembly. Its function is to actively generate and drive a continuous, powerful airflow within the duct assembly 2 through high-speed rotation (or other means). This is the core energy conversion device that enables wind-powered tools to perform blowing or vacuuming functions.

[0064] The air inlet hood 5 refers to the protective and airflow guiding component installed at the air inlet end (airflow inlet) of the duct assembly 2. Its main function is to prevent large foreign objects (such as fingers, stones, branches, etc.) from accidentally entering the duct, protect the internal wind power generating unit (especially the high-speed rotating impeller) and pipes from damage, and at the same time serve as the primary inlet for airflow into the equipment.

[0065] The air inlet hood 5 includes a support 10 and multiple ribs 20. The support 10 serves as the basic frame structure of the air inlet hood 5, providing mechanical support, rigidity, and installation positioning for the entire grille. The multiple ribs 20 are arranged on the support 10, collectively forming a regular or irregular (preferably regular) grille (mesh structure). This grille is the main path that airflow must pass through when entering the duct assembly 2, and its structure directly affects airflow resistance, efficiency, and noise. The thickness of the ribs 20 gradually changes along the airflow direction. This means that the thickness of the ribs 20 is not constant and uniform, but rather increases or decreases continuously and gradually at different positions in the airflow inflow or outflow direction (the specific gradient can vary depending on the design, such as thicker at the front and thinner at the back, teardrop shape, thicker in the middle and thinner at both ends, etc.).

[0066] In summary, this invention, through the adoption of a honeycomb grid design and gradually varying rib thickness 20, allows airflow to pass through the air duct more evenly, avoiding localized eddies and stagnation. This results in smoother airflow, increasing the wind speed and volume of the wind-powered tool, thereby improving its working efficiency. The gradually varying thickness and streamlined surface design of the rib 20 effectively reduce the generation of turbulence and vortices in the airflow, especially in areas where airflow separation occurs on the surface of the rib 20. By optimizing fluid dynamics characteristics, aerodynamic noise (such as turbulence noise and airflow stripping noise) is reduced, significantly lowering the noise level of the equipment during operation. The greater thickness in the middle of the rib 20 ensures structural rigidity and stability, effectively preventing structural deformation or resonance caused by airflow during high-speed operation of the wind-powered tool. Simultaneously, the thinner design at both ends makes the overall structure lighter, improving the tool's portability and operability. The smooth curved surface design of the rib 20 allows for more stable airflow, minimizing localized pressure fluctuations when the airflow passes through the rib 20. This not only optimizes the aerodynamic performance of the duct but also improves the stability and uniformity of airflow, reducing airflow irregularities. The teardrop and elliptical ribs 20 effectively reduce shape drag and frictional drag as airflow passes through the duct. The teardrop design, in particular, smoothly guides airflow acceleration, significantly reducing aerodynamic drag and noise by avoiding flow separation and minimizing adverse pressure gradients. Through precise design of the ribs 20's geometry, thickness, and surface curvature, the airflow characteristics of the duct can be adjusted according to changes in airflow velocity and pressure. Therefore, this design is suitable for wind-powered tools across a variety of wind speed ranges, meeting stability requirements at low flow rates while ensuring efficient operation at high wind speeds.

[0067] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A ductwork accessory, characterized in that, The air duct accessory is disposed at one end of the air duct of the wind-powered tool, and the air duct accessory includes: support; Multiple ribs are provided, and the multiple ribs are arranged on the support to form a grid for airflow. The thickness of the ribs gradually changes along the airflow direction.

2. The duct fitting according to claim 1, characterized in that, The thickness of the ribs increases and then decreases from back to front along the airflow direction.

3. The duct fitting according to claim 1, characterized in that, The rib has at least one side surface that is a smooth curved surface, and the smooth curved surface undulates along the airflow direction.

4. The duct fitting according to claim 3, characterized in that, Both sides of the rib are smooth curved surfaces.

5. The duct fitting according to claim 3, characterized in that, The curvature of the smooth surface gradually changes from one end of the rib in the airflow direction to the other.

6. The duct fitting according to claim 4, characterized in that, The two sides of the rib are symmetrical about a first plane of symmetry, which is parallel to the airflow direction, and the two ends of the rib in the airflow direction are located on the first plane of symmetry.

7. The duct fitting according to any one of claims 2-6, characterized in that, The rib includes a head and a tail, and the junction of the head and the tail is the thickest part of the rib. The thickness change rate of the head in the airflow direction is greater than that of the tail in the airflow direction.

8. The duct fitting according to claim 7, characterized in that, The direction from the tail to the head is opposite to the direction of the airflow.

9. The duct fitting according to claim 7, characterized in that, The direction from the tail to the head is the airflow direction.

10. The duct fitting according to any one of claims 2-6, characterized in that, The rib is symmetrical about a second symmetry plane, which is perpendicular to the airflow direction, and the rib is located at the middle of the airflow direction on the second symmetry plane.

11. The duct fitting according to claim 1, characterized in that, The ribs are arranged in an alternating pattern on the support to form a honeycomb grid.

12. A wind-powered tool, characterized in that, include: ontology; Duct components are installed on the main body; A wind power generating unit is disposed in the duct assembly to generate airflow within the duct assembly; An air inlet hood is installed at the air inlet end of the duct assembly; The air inlet shroud includes a support frame and multiple ribs. The multiple ribs are arranged on the support frame to form a grid through which airflow passes. The thickness of the ribs gradually changes along the airflow direction.

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