Air guide ring assembly

Abstract

The utility model provides an air guide ring assembly which is arranged on the rear side of an impeller of an axial flow fan, the impeller limits a central axis, the air guide ring assembly comprises air guide rings which are continuously arranged around the central axis, and air channels are formed in the hollow portions of the air guide rings. The outer wall of the air guide ring roughly extends outwards in the radial direction to form a plurality of installation parts, the installation parts are evenly distributed in the circumferential direction of the air guide ring and used for being fixedly connected with a panel of the axial flow fan, and the outer edges of at least part of the adjacent installation parts are in arc transition. According to the technical scheme, the outer wall of the air guide ring roughly extends outwards in the radial direction to form the multiple installation parts, the multiple installation parts are evenly distributed in the circumferential direction of the air guide ring and extend in the radial direction, the air guide ring can adapt to fixed connection of round panels, square panels and other polygonal panels, connection between components is compact, stability is high, and material use is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fan manufacturing technical field, concretely relates to a guide vane assembly with a mesh enclosure. BACKGROUND

[0002] The fan generally is provided with a guide vane, and the guide vane generally has a diffusion section, which is generally located at the outlet flow passage part behind the fan impeller, and its function is to convert the kinetic energy of the outlet airflow behind the impeller into pressure energy. After the pressure-increasing effect of the outlet diffusion section, the pressure loss caused by the dynamic pressure can be reduced, and the efficiency of the fan guide vane can be improved.

[0003] Most of the existing guide vanes are fixedly installed on the fan panel, and the panel has shapes such as square and circular. In order to adapt to the installation of panels of different shapes, enhance the compactness and stability of the connection between components, save materials, and the like, it is urgent to develop a guide vane with strong adaptability. SUMMARY

[0004] The main purpose of the utility model is to provide a guide vane assembly, which aims to solve the technical problem that the installation part of the guide vane cannot fully adapt to the fan panel of different shapes.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a guide vane assembly, which is arranged at the rear side of an axial flow fan, the impeller defines a center axis, the guide vane assembly comprises a guide vane arranged continuously around the center axis, and a hollow part of the guide vane forms an air duct.

[0006] Among them, the outer wall of the guide vane extends outward in the radial direction to form a plurality of installation parts, and the plurality of installation parts are uniformly arranged along the circumference of the guide vane and are used for fixed connection with the panel of the axial flow fan, and the outer edges between at least part of the adjacent installation parts are arc-shaped transitions.

[0007] Optionally, the installation part is substantially in a trapezoidal structure.

[0008] Optionally, the installation part is provided with a mounting hole.

[0009] Optionally, the lower base of the trapezoidal structure defines a circle with a minimum diameter D1, 300mm≦D1≦1000mm, and the upper base of the trapezoidal structure defines a circle with a maximum diameter D2, 330mm≦D2≦1030mm.

[0010] Optionally, a plurality of rear guide vanes are uniformly spaced apart along the circumference around the center axis.

[0011] Optionally, with the central axis as the center line, draw cylindrical surfaces of ∅220, ∅320, ∅420, ∅520, ∅620, and ∅720, which intersect the curved surface of the rear guide vane, respectively. In the resulting cross-section, the chord length of the cross-section is L, 30mm≦L≦270mm, and the elevation angle of the cross-section is α, 30 degrees≦α≦75 degrees.

[0012] Optionally, each guide bar extends from the back of the preceding rear guide vane to the front of the following rear guide vane.

[0013] Optionally, each guide bar extends from the top of the back side of the preceding rear guide blade to the bottom of the front side of the following rear guide blade.

[0014] Optionally, each annular structure of the irregular mesh is evenly spaced apart.

[0015] Optionally, it also includes a rectifier having an outer wall, one end of the rear guide vane being connected to the outer wall of the rectifier and the other end being connected to the inner wall of the guide ring.

[0016] Optionally, the rectifier is a rotating body constructed about the central axis.

[0017] This utility model also proposes an axial flow fan, the axial flow fan comprising:

[0018] A control panel, an impeller, and a motor that drives the impeller to rotate;

[0019] As described above, the air guide ring assembly is disposed on the panel and located on the rear side of the impeller.

[0020] In the technical solution of this utility model, multiple mounting parts are extended outward in a roughly radial direction from the outer wall of the air guide ring. These mounting parts are evenly distributed along the circumference of the air guide ring and extend radially. This allows for the fixed connection of circular, square, and other polygonal panels. The connection between the components is compact and stable, and the use of materials is also reduced. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A perspective structural diagram of an embodiment of the air guide ring assembly provided by this utility model;

[0023] Figure 2 for Figure 1A three-dimensional structural diagram from another perspective;

[0024] Figure 3 for Figure 1 The main view;

[0025] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0026] Figure 5 for Figure 3 A sectional view of section AA in the middle;

[0027] Figure 6 for Figure 5 A magnified view of point C;

[0028] Figure 7 for Figure 1 Diagram showing the variation of the cross-section of the middle reinforcing bar;

[0029] Figure 8 for Figure 2 A diagram showing the division of different radii in the middle;

[0030] Figure 9 for Figure 8 A schematic diagram of the chord length and elevation angle of the mid-to-rear guide vane section;

[0031] Figure 10 for Figure 9 Cross-sectional view of the guide vane at ∅220;

[0032] Figure 11 for Figure 9 Cross-sectional view of the guide vane at ∅320;

[0033] Figure 12 for Figure 9 Cross-sectional view of the guide vane at ∅420;

[0034] Figure 13 for Figure 9 Cross-sectional view of the guide vane at ∅520;

[0035] Figure 14 for Figure 9 Cross-sectional view of the guide vane at ∅620;

[0036] Figure 15 for Figure 9 Cross-sectional view of the guide vane at ∅720;

[0037] Figure 16 A perspective structural diagram of an embodiment of the axial flow fan provided by this utility model;

[0038] Figure 17 for Figure 16 Exploded view;

[0039] Figure 18 for Figure 16 Side view;

[0040] Figure 19 for Figure 16 Front view;

[0041] Figure 20 for Figure 16 Rear view.

[0042] In the diagram: Axial flow fan-100, panel-1, bracket-2, motor-3, output shaft-31, impeller-4, central axis-4a, air guide ring assembly-5, rear guide vane group-51, rear guide vane-511, irregular mesh cover-52, coiled ribs-521, air guide ring-53, air duct-53a, irregular edge-531, rectifier-54, drip hole-54a.

[0043] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] To better describe and illustrate the embodiments of this application, reference may be made to one or more accompanying drawings, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the utility model creation, the embodiments or preferred embodiments of this application, or the preferred methods described herein.

[0046] In the description of this utility model, it should be noted that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate that the device referred to must have a specific orientation or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms “upstream” and “downstream” refer to the relative directions of fluid flow in a fluid passage. For example, “upstream” refers to the direction from which the fluid flows, and “downstream” refers to the direction to which the fluid flows.

[0048] Factors such as material, structural design, airflow performance, and cleaning and maintenance affect the performance of the rear guide vane during use, leading to a significant increase in the production and maintenance costs of the rear guide vane.

[0049] In view of this, the present invention proposes an air guide ring assembly. Figures 1-3 This is one embodiment of the air guide ring assembly provided by this utility model. Figures 16-20 For an embodiment of the axial flow fan provided by this utility model, please refer to [link / reference]. Figures 1-3 , Figures 16-20 The air guide ring assembly 5 is located on the rear side of the impeller 4 of the axial flow fan 100, that is, the downstream position. The impeller 4 defines the central axis 4a. The air guide ring assembly 5 is composed of multiple rear guide vanes 511, multiple coils 521, a rectifier 54 and an air guide ring 53.

[0050] Multiple rear guide vane groups 51 are formed, which can guide and convert the airflow with rotational component output by the impeller 4, making the airflow direction tend to the axial direction, while increasing the static pressure. Each rear guide vane 511 has a shape and orientation corresponding to the airflow conditions leaving the rear guide vane group 51. In this embodiment, there are 8 rear guide vanes 511, which are placed circumferentially spaced around the central axis 4a, and the whole is in a divergent shape.

[0051] Multiple coils 521 form an irregularly shaped mesh cover 52, which is arranged in multiple rings around the central axis 4a. Each coil 521 extends from the blade surface of the preceding rear guide vane 511 to the blade surface of the following rear guide vane 511. All ring structures of the irregularly shaped mesh cover 52 expand radially outward, and each ring structure is spaced apart. It should be understood that in some embodiments, the individual coils 521 of the same ring structure are not arranged in the same plane, but are approximately ring-shaped from an axial perspective, which is determined by the connection point of each coil 521 at the rear guide vane 511. The ring-shaped mesh cover 52 can initially guide the air; and if these coils 521 are at least partially exposed at the air outlet of the fan before the rear guide vane 511, they can provide protection against debris and foreign objects entering the fan and damaging the impeller 4, etc.

[0052] The air guide ring 53 is continuously arranged around the central axis 4a, and its shape is a roughly annular air duct. The hollow part of the air duct forms the air duct 53a, and the rear guide vane assembly 51 and the irregularly shaped mesh cover 52 are fixed in the air duct 53a. The arrangement of the air guide ring 53 allows air to enter the air duct 53a relatively smoothly and evenly, without dispersion. The two ends of the air guide ring 53 are the inlet and outlet of the airflow through the air duct 53a, respectively. Its shape and size design affect the intake efficiency and uniformity of the airflow. A reasonable air inlet design can ensure that the fan can draw in enough air with less resistance. In this embodiment, the specifications of the air guide ring 53 are determined according to the size of the impeller 4 and the panel 1.

[0053] Please see Figure 1 and 2 In this embodiment, the end of each rear guide vane 511 of the rear guide vane assembly 51 is connected to the inner wall of the air guide ring 53, and the coiled ribs 521 of the irregular mesh cover 52 are connected to the rear guide vanes 511. Alternatively, in some embodiments, some of the coiled ribs 521 of the irregular mesh cover 52 are connected to the inner wall of the air guide ring 53, and each rear guide vane 511 of the rear guide vane assembly 51 is connected to other coiled ribs 521. Or, in some embodiments, the ends of both some of the coiled ribs 521 of the irregular mesh cover 52 and the rear guide vanes 511 are connected to the inner wall of the air guide ring 53.

[0054] Additionally, it should be noted that the multiple rear guide vanes 511 are arranged circumferentially around the central axis 4a, and a structure connecting the other end of each rear guide vane 511 should be provided at its center. In this embodiment, this structure is set as a cylinder, which has the function of finely adjusting the airflow to make the airflow more stable and uniform, and is also called a rectifier 54.

[0055] Please see Figure 3 In one embodiment of this utility model, the air guide ring 53 has an outer edge, which is integrally connected to the outer wall of the air inlet of the air guide ring 53. Its shape is approximately conventional, and its overall shape is roughly a rectangle with its four corners cut off, forming an outer edge that is approximately octagonal, thus allowing it to fit snugly. Figure 19 The square panel shown can also accommodate the installation of a round panel. Furthermore, this forms eight radially outward extending mounting portions 531, which are evenly distributed along the circumference of the air guide ring 53.

[0056] Please see Figure 16 , 19 The mounting part 531 is provided with mounting holes 531a, which can be fixedly connected to the square panel 1 of the axial flow fan 100 by bolts or rivets.

[0057] It should be noted that for panels of different shapes, such as triangular panels, the outer edge can be formed into an approximate regular hexagon, that is, forming 6 mounting parts that extend outward in a radial direction.

[0058] Furthermore, to save material on the mounting portion 531 on the outer side of the air guide ring, the mounting portion 531 is roughly trapezoidal in shape, that is, the apex of the regular octagon is cut off, so that the edge of the mounting portion 531, that is, the upper base of the trapezoidal structure, fits better with different models of circular panels. It should be understood that the top edge of the mounting portion 531 can be a straight line or an arc that fits better with the circular panel.

[0059] To ensure the structural strength of the installation part 531, the slope of the trapezoidal structure is ≤45 degrees to prevent it from being easily broken and its stability from deteriorating.

[0060] Please see Figure 3 and 4 The edges of two adjacent mounting portions 531 are originally aligned on a straight line. To further conserve material on the outer side of the air guide ring, the edges between some adjacent mounting portions 531 are curved, forming an arc-shaped notch 532. In this arc-shaped notch 532, γ is the angle between the hypotenuse of the trapezoidal structure and the radial line of the arc-shaped notch, with a value of 60 degrees ≤ γ ≤ 90 degrees. This is to prevent excessive material removal, which could affect the compactness and stability of the connections between components. Please refer to... Figure 19 A limiting component can be installed at the edge of panel 1 near the arc-shaped notch 532 to press it tight, thereby enhancing the stability of the air guide ring 5 and preventing air leakage.

[0061] In this embodiment, the lower end point of the mounting portion 531 of the trapezoidal structure defines a circle with a minimum diameter D1, 300mm ≤ D1 ≤ 1000mm; the upper end of the trapezoidal structure defines a circle with a maximum diameter D2, 330mm ≤ D2 ≤ 1030mm. This diameter range can accommodate most types of square or round panels, resulting in a compact connection and strong stability between components.

[0062] The efficiency improvement of Installation Department 531 is as follows.

[0063] Material saving: The design of the mounting part 531, which is formed by cutting off the four corners of the rectangle, reduces the amount of material used compared to the conventional shape. While ensuring the performance of the air guide ring 53, it effectively reduces the cost of raw materials and avoids unnecessary waste.

[0064] Reduced size: The unique irregular structure helps to reduce the space occupied at the bottom of the air guide ring 53, thereby reducing the overall size of the fan product, making it more advantageous in space-constrained installation environments, and also facilitating product transportation and packaging.

[0065] Weight reduction: The reduction in the amount of material used directly results in a lighter air guide ring 53, which not only facilitates the installation and handling of the fan, but also reduces the load on the fan during operation and reduces energy consumption.

[0066] High adaptability: The shape of the mounting part 531 can better match other components of the wind turbine, enhance the compactness and stability of the connection between the components, and improve the reliability of the overall structure of the wind turbine.

[0067] Please see Figure 4 In this embodiment, the minimum diameter D1 at the lower end of the trapezoidal mounting portion 531 is 300mm ≤ D1 ≤ 1000mm; the maximum diameter D2 at the upper end of the trapezoidal mounting portion 531 is 330mm ≤ D2 ≤ 1030mm; the angle γ between the hypotenuse and the y-axis is 60 degrees ≤ γ ≤ 90 degrees. In this embodiment, D1 = 775mm, D2 = 825mm, and γ = 85 degrees.

[0068] To reduce manufacturing and maintenance costs, please refer to Figure 1 and 2 In one embodiment of this utility model, the air guide ring assembly 5 is integrally injection molded. The rear guide vane assembly 51 and the irregularly shaped mesh cover 52, air guide ring 53 and rectifier 54 connected to the rear guide vane assembly 51 can be integrally manufactured by injection molding, which reduces costs, strengthens the strength of each component, and effectively increases the overall efficiency and protection of the axial flow fan 100.

[0069] Specifically, the air guide ring assembly 5 is made entirely of plastic and is integrally molded by injection molding, which can effectively improve the structural advantages, cost-effectiveness, design flexibility, corrosion resistance, etc. of the assembly. The specific performance improvements are as follows.

[0070] Structural advantages: The integrated design reduces the number of connections between components, improves the overall structural strength and stability, and reduces the risk of failure due to loose connections. Furthermore, this design allows for better collaboration between components, optimizes airflow paths, reduces airflow leakage and turbulence, and enhances the aerodynamic performance of the fan.

[0071] Cost-effectiveness: One-piece injection molding is suitable for mass production. Compared to manufacturing individual components and then assembling them, it reduces production steps and assembly time, thus lowering labor costs. At the same time, it reduces the use of connecting parts, further reducing material costs. Additionally, the simple overall structure facilitates maintenance, further reducing maintenance costs.

[0072] Design flexibility: Injection molding of plastic materials can achieve complex geometric shapes and fine structural designs, meeting the special design requirements of different fans for irregularly shaped mesh covers 52, rear guide vanes 511, and air guide rings 53. This allows engineers to optimize the design according to actual application scenarios, improving the performance and appearance of the fans.

[0073] Corrosion resistance: Most plastics have good corrosion resistance and can adapt to a variety of harsh environments, such as humid places and places with corrosive gases, extending the service life of the fan and reducing the frequency of component damage and replacement due to corrosion.

[0074] Of course, the embodiments of this utility model are not limited to this. The rear guide vane 511 can also be fixed inside the air guide ring 53 by welding, bolting, or snap-fitting, forming an airflow channel together with components such as the coil 521. The irregularly shaped mesh cover 52 can also be installed on the outside of the air guide ring 53 and connected to the air guide ring 53 by bolts, snap-fitting, or nesting. The rectifier 54 is installed in a suitable position inside the air guide ring 53 and may be fixed to the air guide ring 53 by welding or bolting to further rectify the airflow.

[0075] Please see Figure 3 In this embodiment, the eight rear guide vane groups 51 are evenly spaced circumferentially around the central axis 4a, and positioned circumferentially at approximately 12 o'clock, approximately 1:30, approximately 3 o'clock, approximately 4:30, approximately 6 o'clock, approximately 7:30, approximately 9 o'clock, and approximately 10:30 relative to the central axis 4a. The rear guide vane groups 51, evenly radiating from the outer wall of the rectifier 54, can rectify the airflow exiting the impeller 4, streamlining the airflow with a rotational component into axial flow, reducing turbulence and eddies, and lowering energy loss; simultaneously, they can convert some of the rotational kinetic energy of the airflow into pressure energy, increasing the static pressure at the fan outlet and the air delivery range. In an alternative embodiment, the rear guide vane groups 51 can be randomly spaced around the rectifier 54 circumferentially along the central axis 4a.

[0076] Please see Figures 8-9 In one embodiment of this utility model, with the central axis 4a as the center line, cylindrical surfaces of ∅220, ∅320, ∅420, ∅520, ∅620, and ∅720 are drawn, which intersect with the curved surface of the rear guide vane 511 respectively, and the resulting cross-section is shown in the figure. The chord length of the cross-section is L, 30mm≦L≦270mm, and the elevation angle of the cross-section is α, 30 degrees≦α≦75 degrees.

[0077] Specifically, please refer to Figures 10-15 In this embodiment, the cross section at ∅220 has an angle of α=44 degrees and a length of L=69.3 mm; the cross section at ∅320 has an angle of α=41 degrees and a length of L=70 mm; the cross section at ∅420 has an angle of α=51 degrees and a length of L=68.8 mm; the cross section at ∅520 has an angle of α=58 degrees and a length of L=65.3 mm; the cross section at ∅620 has an angle of α=61 degrees and a length of L=62.3 mm; and the cross section at ∅720 has an angle of α=61 degrees and a length of L=62.4 mm. The rear guide vane 511 with this efficient noise reduction curved surface can increase the airflow range, reduce losses, and improve overall efficiency. The specific performance improvements are as follows.

[0078] Optimizing airflow direction and energy recovery: The rear guide vane 511 further guides and rectifyes the airflow accelerated by the impeller 4. It can adjust the airflow with a certain rotational speed at the outlet of the impeller 4 into axial flow, reducing swirling losses and improving the energy utilization rate of the airflow. By rationally designing the shape, angle, and number of the rear guide vanes 511, the airflow can enter the subsequent pipeline system more evenly, optimizing the pressure distribution and flow characteristics of the entire fan system, thereby improving the performance and efficiency of the fan.

[0079] Noise and vibration reduction: The rear guide vane 511 effectively reduces noise and vibration caused by airflow rotation and turbulence. During fan operation, if the airflow at the impeller 4 outlet is not adjusted by the rear guide vane 511, it will generate significant swirling and pulsation, leading to increased noise and vibration. The rear guide vane 511, through its rectifying effect on the airflow, makes the airflow flow more smoothly, reducing airflow instability factors, thereby reducing the noise and vibration generated during fan operation and improving the fan's operational stability and comfort.

[0080] Please see Figure 3 In one embodiment of this utility model, each coil 521 extends from the back of the front guide vane 511 to the front of the rear guide vane 511, and eight coils 521 can form a roughly annular structure. All layers of the annular structure of the irregular mesh cover 52 expand radially outward with the central axis as the center, and each layer of annular structure is spaced apart. In this embodiment, each layer of annular structure of the irregular mesh cover 52 is evenly spaced apart, with an interval of 9.5 mm between adjacent layers of annular structure.

[0081] Furthermore, the individual ribs 521 of the same annular structure are not on the same plane, but are approximately annular in an axial view, which is determined by the connection point of each rib 521 to the rear guide vane 511. As a preferred embodiment, please refer to... Figure 1 and 2 The ribs 521 are irregularly shaped in the axial direction, extending from the top of the back side of the first rear guide vane 511 to the bottom of the front side of the second rear guide vane 511. Their function is to simplify the structure of the molding die, enabling product molding through simple opening and closing of the die without causing unnecessary material waste. Specific benefits are as follows.

[0082] Low mold cost: The axial distribution of the irregular mesh cover 52 simplifies the mold structure, eliminating the need for complex mold design and manufacturing processes. Product molding can be achieved through simple mold opening and closing, reducing mold development costs and cycle time, and improving production efficiency.

[0083] High material utilization: Its unique 521 distribution design of the coiled ribs will not cause unnecessary material waste. While ensuring the performance of the mesh cover, it reduces the consumption of raw materials and lowers the production cost.

[0084] Good air guiding performance: The radially distributed ribs 521, with the center of the air guide ring 53 and the rectifier 54 as the center, help to optimize the airflow guidance, make the air intake of the fan more uniform and stable, improve the overall air guiding efficiency of the fan, and thus improve the performance of the fan.

[0085] Reasonable structural strength: This irregularly distributed 521 rib structure can meet ventilation requirements while ensuring that the mesh cover has a certain structural strength, can withstand a certain amount of external impact, and ensure the safety and stability of the fan operation.

[0086] Easy to manufacture: The simple mold forming method reduces the difficulty of manufacturing, the technical requirements for operators are relatively low, it is conducive to expanding the scale of production, and the consistency of product quality is easier to ensure.

[0087] In one embodiment of this utility model, the design process of the coiled rib 521 is as follows.

[0088] Step 1. Draw the projection lines and offset lines of the rear guide vane 511: Using the fixed surface of the wind guide ring 53 as the drawing plane, project the edge lines of the first and second rear guide vanes 511 as the projection lines of the first and second rear guide vanes 511, and offset them to the sides by 4.5mm to obtain the projection offset lines of the first and second rear guide vanes 511.

[0089] Step 2. Draw the inner and outer trajectory lines of the top and bottom of the coil 521: Connect the outer endpoint of the projection line of the first rear guide vane 511 and the outer endpoint of the projection offset line of the second rear guide vane 511, and project them onto the inner wall of the wind guide ring 53 to form the outer trajectory line of the top of the coil 521; connect the inner endpoint of the projection line of the first rear guide vane 511 and the inner endpoint of the projection offset line of the second rear guide vane 511, and project them onto the outer wall of the rectifier 54 to form the inner trajectory line of the top of the coil 521; similarly, obtain the outer trajectory line of the bottom of the coil 521 and the inner trajectory line of the bottom of the coil 521.

[0090] Step 3. Draw the top and bottom structural surfaces of the coil 521: Draw the top structural surface of the coil 521 using the projection lines of the first rear guide vane 511, the projection offset lines of the second rear guide vane 511, the outer trajectory line of the top of the coil 521, and the inner trajectory line of the top of the coil 521 as the four sides; Draw the bottom structural surface of the coil 521 using the projection offset lines of the first rear guide vane 511, the projection lines of the second rear guide vane 511, the outer trajectory line of the bottom of the coil 521, and the inner trajectory line of the bottom of the coil 521 as the four sides.

[0091] Step 4. Draw the irregularly shaped coil 521: Using the fixed surface of the air guide ring 53 as the drawing plane, draw the cross-section of the coil 521, which spreads outward radially. After the cross-section of the coil 521 is drawn, stretch it upward to the top structural surface of the coil 521 and terminate at the bottom structural surface of the coil 521. The irregularly shaped coil 521 is now drawn.

[0092] Step 5. Chamfering of irregular-shaped rib 521: Chamfer the four sharp corners around the irregular-shaped rib 521 with unequal sides, then round the two sharp corners at the top and bottom, and finally round the four corners on the sides.

[0093] Step 6. The irregular mesh cover 52 is completed. The cross-section of the irregular mesh cover rib 521 is shown in the figure.

[0094] Figure 6 The cross-sectional view of the irregularly shaped reinforcing bar 521 in the mesh cover is shown. The cross-sectional width is A, 2mm≦A≦7mm; the cross-sectional height is B, 3mm≦B≦15mm; and the chamfer and side angle of the cross-section is β, 100 degrees≦β≦170 degrees.

[0095] In this embodiment, Example A = 3.5 mm, Example B = 6 mm, and β = 160 degrees.

[0096] Please see Figure 1 In one embodiment of this utility model, the rectifier 54 is a rotating body constructed around the central axis 4a. The rectifier 54 has an outer wall, and one end of the rear guide vane 511 away from the inner wall of the guide ring 52 is connected to the outer wall of the rectifier 54, while the other end is connected to the inner wall of the guide ring 53. As shown in the figure, the rectifier 54 is located at the air outlet of the fan, behind the impeller 4, that is, downstream of the fan. Its overall structure is a cylinder, and the end opposite to the impeller 4 has an inwardly cylindrical groove. The specific performance improvement is as follows.

[0097] Optimize airflow direction: The rectifier 54 is located at the air outlet of the fan and behind the motor 3. It can effectively block the airflow from flowing back to the middle of the impeller 4, avoid mutual interference of airflow, make the airflow discharged by the fan smoother, reduce turbulence, and improve the overall aerodynamic performance of the fan.

[0098] Improving fan efficiency: Reduced turbulence means less energy loss during fan operation, allowing airflow to be discharged more efficiently. This helps improve fan efficiency, enabling greater airflow output with the same energy consumption, or reducing energy consumption for the same airflow demand.

[0099] Reduced operating noise: Reduced turbulence can reduce noise caused by irregular airflow, making the fan run more quietly and improving the comfort of the user environment. It is especially suitable for places with high noise requirements, such as offices and hospitals.

[0100] Extending equipment lifespan: Stable airflow can reduce uneven stress on impeller 4 and other internal components, reduce wear and tear on components, decrease the probability of failure, thereby extending the service life of the fan equipment and reducing maintenance costs.

[0101] Simple and practical structure: The overall structure is a cylinder with the top removed. The design is simple, easy to manufacture and install. While ensuring effective rectification, it does not bring too much complexity to the production and assembly of the fan, which is conducive to large-scale production and application.

[0102] During airflow, panel 1 provides some constraint and initial guidance to the airflow, while the additional air guide ring 53 further guides the airflow, making it flow more smoothly and concentratedly towards the outlet, reducing airflow turbulence and energy loss. Finally, the accelerated and guided air is discharged from the fan outlet, realizing the fan's ventilation or gas transport function.

[0103] Preferably, the rectifier 54 is provided with a drip hole 54a through the central axis 4a. If the fan is operating in a high humidity environment, when condensate or other liquids accumulate on the surface of the air guide ring assembly 5, the drip hole 54a can allow the liquid to be discharged smoothly, preventing the liquid from entering the fan and affecting the normal operation of the fan.

[0104] Figures 16-20 Please refer to the figure for an embodiment of the axial flow fan provided by this utility model. Figures 16-20 The axial flow fan 100 includes a panel 1, an impeller 4, and a motor 3 that drives the impeller 4 to rotate. The base of the motor 3 is fixed on a bracket 2, and its output shaft 31 is fixedly connected to the impeller 4. The bracket 2 and the panel 1 are fixed to each other. The air guide ring assembly 5 is fixed to the panel 1 and located downstream of the impeller 4. The outer edge of its air guide ring 53 is provided with screw holes and is fixed to the panel by screws.

[0105] The overall working process of the axial flow fan 100 is as follows:

[0106] After the motor 3 is powered on, it starts to run, converting electrical energy into mechanical energy, which drives the impeller 4 to rotate at high speed through the output shaft 31. The blades of the impeller 4 push the surrounding air, giving it speed and kinetic energy, and the air is quickly drawn into the fan. Under the action of the rotation of the impeller 4, the air continuously enters from the air inlet, and after being accelerated by the impeller 4, it flows towards the fan outlet at a high speed and kinetic energy.

[0107] During airflow, panel 1 provides some constraint and initial guidance to the airflow, while the additional air guide ring 53 further guides the airflow, making it flow more smoothly and concentratedly towards the outlet, reducing airflow turbulence and energy loss. Finally, the accelerated and guided air is discharged from the fan outlet, realizing the fan's ventilation or gas transport function.

[0108] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The above embodiments merely illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A guide vane assembly (5) disposed behind an impeller (4) of an axial flow fan (100), the impeller (4) defining a central axis (4a), characterized in that, The air guide ring assembly (5) includes an air guide ring (53) continuously arranged around the central axis (4a), and the hollow portion of the air guide ring (53) forms an air duct (53a). The outer wall of the air guide ring (53) extends outward in a radial direction to form a plurality of mounting parts (531). The plurality of mounting parts (531) are evenly arranged along the circumference of the air guide ring (53) for fixed connection with the panel of the axial flow fan (100). At least some of the adjacent mounting parts (531) have an arc transition between their outer edges.

2. The air guide ring assembly (5) as described in claim 1, characterized in that, The mounting section is roughly trapezoidal in shape.

3. The air guide ring assembly (5) as described in claim 2, characterized in that, The mounting part (531) is provided with mounting holes (531a).

4. The air guide ring assembly (5) as described in claim 2, characterized in that, The lower base of the trapezoidal structure is defined by a circle with a minimum diameter D1, 300mm≦D1≦1000mm; the upper base of the trapezoidal structure is defined by a circle with a maximum diameter D2, 330mm≦D2≦1030mm.

5. The air guide ring assembly (5) as described in claim 1, characterized in that, The air guide ring assembly (5) also includes a plurality of rear guide vanes (511) that make up the rear guide vane group (51), each rear guide vane (511) having a shape and orientation corresponding to the airflow conditions leaving the rear guide vane group (51), and the plurality of rear guide vanes (511) being circumferentially spaced around the central axis (4a).

6. The air guide ring assembly (5) as described in claim 5, characterized in that, With the central axis (4a) as the center line, draw cylindrical surfaces of ∅220, ∅320, ∅420, ∅520, ∅620, and ∅720, which intersect with the curved surface of the rear guide vane (511). In the resulting cross-section, the chord length of the cross-section is L, 30mm≦L≦270mm, and the elevation angle of the cross-section is α, 30 degrees≦α≦75 degrees.

7. The air guide ring assembly (5) as described in claim 5, characterized in that, The wind guide ring assembly (5) also includes multiple coils (521) that make up the irregular mesh cover (52). The irregular mesh cover (52) is arranged in a multi-layer ring around the central axis (4a). Each coil (521) extends from the blade surface of the front rear guide vane (511) to the blade surface of the rear rear guide vane (511).

8. The air guide ring assembly (5) as described in claim 7, characterized in that, Each coil (521) extends from the top of the back side of the preceding rear guide vane (511) to the bottom of the front side of the following rear guide vane (511).

9. The air guide ring assembly (5) as described in claim 5, characterized in that, The air guide ring assembly (5) further includes a rectifier (54) constructed around the central axis (4a), the rectifier (54) having an outer wall, one end of the rear guide vane (511) being connected to the outer wall of the rectifier (54), and the other end being connected to the inner wall of the air guide ring (53).

10. The air guide ring assembly (5) as described in claim 9, characterized in that, The rectifier (54) is a rotating body constructed about the central axis (4a).

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