Air guide ring assembly

Abstract

The invention provides an air guide ring assembly which is arranged on the rear side of an impeller of an axial flow fan, the impeller of the axial flow fan limits a central axis, and the air guide ring assembly comprises a plurality of rear guide blades forming a rear guide blade set, a plurality of disc ribs forming a special-shaped net cover and an air guide ring continuously arranged around the central axis. A plurality of aft vanes, each aft vane including a shape and orientation corresponding to an airflow condition exiting the aft vane set, the plurality of aft vanes being circumferentially spaced about the central axis; the special-shaped mesh enclosure is annularly distributed in a multi-layer mode with the central axis as the center, and each disc rib extends from the blade surface of the front rear guide blade to the blade surface of the rear guide blade; the hollow part of the air guide ring forms an air channel, and the rear guide vane set and the special-shaped net cover are both arranged in the air channel. According to the technical scheme, the special-shaped mesh enclosure and the rear guide vane are connected and can be integrally manufactured in an injection molding mode, the cost is reduced, meanwhile, the strength is enhanced, and the overall efficiency and the protection performance of the fan are effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of fan manufacturing, and particularly relates to a guide vane assembly with a net cover attached thereto. Background Art

[0002] In high-speed axial fans, the structure of the rear guide vane is an effective solution to improve the performance and efficiency of the fan without increasing energy consumption. The rear guide vane is arranged downstream of the fan. By changing the rotation direction of the air flow, the deflected air flow passing through the fan impeller is swirled back to the axial direction, and at the same time, the kinetic energy of the deflected air flow is converted into static pressure energy, thereby improving the working efficiency of the fan.

[0003] At present, in the design schemes of the rear guide vanes of axial fans, various materials are selected. In harsh environments such as industrial workshops and underground parking lots, stainless steel with high strength and corrosion resistance is often used; in occasions with requirements for weight and installation space, aluminum alloy is selected because of its light weight, good heat conduction and easy processing; in scenarios such as indoor ventilation where the temperature requirement is not high, engineering plastics such as ABS and PP with low cost, good insulation and corrosion resistance but poor strength and high-temperature resistance are mostly used.

[0004] In terms of structural design, the metal rear guide vane has high strength, can withstand large pressure and stress, the blades are precisely processed, and the net cover is firmly connected to the rear guide vane; the plastic rear guide vane is light and flexible but easy to deform, and the net cover is mostly connected by means of snap-fasteners or nesting that are convenient for disassembly and assembly. During installation, the metal rear guide vane has methods such as bolts, snap-fasteners and welding; the plastic rear guide vane mainly uses snap-fasteners or nesting, which all increase the manufacturing and installation costs.

[0005] In terms of air flow performance, the metal rear guide vane precisely controls the air flow and performs well in scenarios with high wind speed and large flow rate. The stability of the plastic rear guide vane when dealing with high-speed and high-pressure air flow is affected by its flexibility.

[0006] In terms of cleaning and maintenance, the metal rear guide vane with rust prevention treatment can be wiped with a damp cloth, and special cleaning agents are mostly required for oil stains. The plastic rear guide vane is easy to accumulate dust but can be washed with water. In terms of cost, the metal material stainless steel is the most expensive, aluminum alloy is the second, and plastic is the lowest. The metal process is complex and costly during processing, and the plastic injection mold has a high cost, but the unit cost for mass production is low. Mass-producing plastic has a greater cost advantage.

[0007] The above factors affect the performance of the rear guide vane during use, resulting in a significant increase in the production cost and maintenance cost of the rear guide vane. Therefore, how to design a rear guide vane that can meet the above factors and has a lower cost is an urgent problem for us to solve. Summary of the Invention

[0008] The main object of the present invention is to propose a guide vane assembly, aiming to solve the technical problem of reducing the cost of the rear guide vane while meeting the performance requirements.

[0009] To achieve the above object, the present invention provides a wind guiding ring assembly, which is disposed at the rear side of the impeller of an axial flow fan. The impeller defines a central axis, and the wind guiding ring assembly includes: A plurality of rear guide vanes forming a rear guide vane group. Each rear guide vane includes a shape and orientation corresponding to the air flow condition leaving the rear guide vane group. The plurality of rear guide vanes are circumferentially spaced apart around the central axis; A plurality of disk ribs forming a special-shaped mesh cover. The special-shaped mesh cover is distributed in multiple layers in a ring shape with the central axis as the center. Each disk rib extends from the blade surface of a front rear guide vane to the blade surface of a rear rear guide vane; and, A wind guiding ring continuously disposed around the central axis. The hollow part of the wind guiding ring forms a wind duct, and the rear guide vane group and the special-shaped mesh cover are both disposed in the wind duct.

[0010] Optionally, the wind guiding ring assembly is integrally injection molded.

[0011] Optionally, the plurality of rear guide vanes are circumferentially evenly spaced apart around the central axis.

[0012] Optionally, taking the central axis as the center line, cylindrical surfaces of ∅220, ∅320, ∅420, ∅520, ∅620, and ∅720 are drawn, which respectively intersect with the rear guide vane surface. In the generated cross-section, the chord length of the cross-section is L, 30 mm ≤ L ≤ 270 mm, and the elevation angle of the cross-section is α, 30 degrees ≤ α ≤ 75 degrees.

[0013] Optionally, each disk rib extends from the back surface of a front rear guide vane to the front surface of a rear rear guide vane.

[0014] Optionally, each disk rib extends from the top of the back surface of a front rear guide vane to the bottom of the front surface of a rear rear guide vane.

[0015] Optionally, the annular structures of each layer of the special-shaped mesh cover are evenly spaced apart.

[0016] Optionally, it further includes a rectifier. The rectifier has an outer wall. One end of the rear guide vane is connected to the outer wall of the rectifier, and the other end is connected to the inner wall of the wind guiding ring.

[0017] Optionally, the rectifier is a rotating body constructed around the central axis.

[0018] Optionally, the rectifier is provided with a water dripping hole along the central axis.

[0019] The present invention also provides an axial flow fan, which includes: A panel, an impeller, and a motor for driving the impeller to rotate; The wind guiding ring assembly as described above. The wind guiding ring assembly is disposed on the panel and at the rear side of the impeller.

[0020] In the technical solution of the present invention, when the axial flow fan is operating, air is sucked into the air duct of the air guide ring and can enter smoothly and evenly. The special-shaped mesh cover first conducts preliminary guidance on the air and can also block foreign objects from entering. Subsequently, the air flow enters the air duct, and the rear guide vane begins to play a role, guiding and converting the energy of the air flow with a rotational component output by the impeller, making the air flow direction tend to be axial and simultaneously increasing the static pressure. The special-shaped mesh cover is connected to the rear guide vane and can be integrally manufactured by injection molding, reducing the cost while strengthening the strength, and effectively increasing the overall efficiency and protection of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0022] Figure 1 Stereoscopic structure diagram of an embodiment of the air guide ring assembly provided by the present invention; Figure 2 For Figure 1 Stereoscopic structure diagram from another perspective; Figure 3 For Figure 1 Front view; Figure 4 For Figure 3 Enlarged view at B in Figure 5 For Figure 3 Cross-sectional view of the A-A section in Figure 6 For Figure 5 Enlarged view at C in Figure 7 For Figure 1 Variation diagram of the cross-sectional area of the disk rib in Figure 8 For Figure 2 Division diagram of different radii in Figure 9 For Figure 8 Schematic diagram of the chord length and elevation angle of the rear guide vane section in Figure 10 For Figure 9 Cross-sectional view of the rear guide vane at ∅220 in Figure 11 For Figure 9 Cross-sectional view of the rear guide vane at ∅320 in Figure 12 For Figure 9Cross-sectional view of the trailing guide vane at ∅420; Figure 13 is Figure 9 Cross-sectional view of the trailing guide vane at ∅520; Figure 14 is Figure 9 Cross-sectional view of the trailing guide vane at ∅620; Figure 15 is Figure 9 Cross-sectional view of the trailing guide vane at ∅720; Figure 16 Isometric structure diagram of an embodiment of the axial flow fan provided by the present invention; Figure 17 is Figure 16 exploded view of; Figure 18 is Figure 16 side view of; Figure 19 is Figure 16 front view of; Figure 20 is Figure 16 rear view of.

[0023] In the figure: axial flow fan - 100, panel - 1, bracket - 2, motor - 3, output shaft - 31, impeller - 4, central axis - 4a, air guide ring assembly - 5, trailing guide vane group - 51, trailing guide vane - 511, special-shaped wire mesh cover - 52, disk rib - 521, air guide ring - 53, air duct - 53a, special-shaped edge - 531, rectifier - 54, water drip hole - 54a.

[0024] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0026] To better describe and illustrate the embodiments of the present application, one or more accompanying drawings can be referred to, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the inventive creations of the present application, the currently described embodiments or the preferred modes.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the positional relationship shown in the drawings. It is only for the convenience of describing the present invention, rather than indicating that the device referred to must have a specific orientation or operate in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments, and are not intended to limit this application. The terms "upstream" and "downstream" refer to the relative directions with respect to the fluid flow in the 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.

[0029] Factors such as material, structural design, air flow performance, cleaning and maintenance affect the performance of the rear guide vane during use, resulting in a significant increase in the production cost and maintenance cost of the rear guide vane.

[0030] In view of this, the present invention proposes a wind guiding ring assembly. Figures 1-3 This is an embodiment of the wind guiding ring assembly provided by the present invention. Figures 16-20 This is an embodiment of the axial flow fan provided by the present invention. Please refer to Figures 1-3 、 Figures 16-20 As shown in FIGS. 1 and 2, the wind guiding ring assembly 5 is disposed at the rear side, that is, the downstream position, of the impeller 4 of the axial flow fan 100. The impeller 4 defines a central axis 4a. The wind guiding ring assembly 5 is composed of a plurality of rear guide vanes 511, a plurality of disk ribs 521, a rectifier 54, and a wind guiding ring 53.

[0031] The plurality of rear guide vanes 51 form a rear guide vane group 51, which can guide and convert the energy of the airflow with a rotational component output by the impeller 4, making the airflow direction tend to be axial and simultaneously increasing the static pressure. Each rear guide vane 511 has a shape and orientation corresponding to the airflow condition leaving the rear guide vane group 51. In this embodiment, there are 8 rear guide vanes 511, and the 8 rear guide vanes 511 are circumferentially spaced around the central axis 4a and are overall in a divergent shape.

[0032] A plurality of disc ribs 521 form a special-shaped mesh cover 52. The special-shaped mesh cover 52 is distributed in multiple layers in a ring shape centered on the central axis 4a. Each disc rib 521 extends from the blade surface of the front guide vane 511 to the blade surface of the rear guide vane 511. All the ring-shaped structures of the special-shaped mesh cover 52 continuously expand radially outwards, and the ring-shaped structures of each layer are arranged at intervals. It should be understood that in some embodiments, the disc ribs 521 of the same ring-shaped structure are not arranged in the same plane, but are approximately annular in the axial view, which is determined by the connection of each disc rib 521 at the guide vane 511. The ring-shaped distributed special-shaped mesh cover 52 can initially guide the air; and if at least part of these disc ribs 521 can be exposed at the air outlet position of the fan prior to the guide vane 511, it can play a protective role to prevent sundries and foreign objects from entering the fan interior and damaging the impeller 4, etc.

[0033] The air guide ring 53 is continuously arranged around the central axis 4a. Its shape is a wind barrel approximately in a ring shape. The hollow part of the wind barrel forms a wind duct 53a. The rear guide vane group 51 and the special-shaped mesh cover 52 are fixed in the wind duct 53a. The setting of the air guide ring 53 enables the air to enter smoothly and evenly when being inhaled into its wind duct 53a without divergence. The two ends of the air guide ring 53 are respectively the inlet and outlet of the air flow passing through its wind duct 53a. Its shape and size design will affect the inhalation efficiency and uniformity of the air flow. A reasonable inlet design can ensure that the fan inhales sufficient air with less resistance. In this embodiment, the specifications of the air guide ring 53 are determined according to the sizes of the impeller 4 and the panel 1.

[0034] Please refer to Figure 1 and 2 , in this embodiment, the end of each rear guide vane 511 of the rear guide vane group 51 is connected to the inner wall of the air guide ring 53, and the disc rib 521 of the special-shaped mesh cover 52 is connected to the rear guide vane 511. Or in some embodiments, some disc ribs 521 of the special-shaped 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 group 51 is connected to other disc ribs 521. Or in some embodiments, some disc ribs 521 of the special-shaped mesh cover 52 and the ends of the rear guide vanes 511 are both connected to the inner wall of the air guide ring 53.

[0035] In addition, it should be noted that a plurality of rear guide vanes 511 are arranged at intervals circumferentially around the central axis 4a, and a structure connecting the other ends 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 air flow to make the air flow more stable and uniform, and is also called a rectifier 54.

[0036] In order to reduce the manufacturing and maintenance costs, please refer to Figure 1 and 2, in an embodiment of the present invention, the air guide ring assembly 5 is integrally injection-molded. The rear guide vane group 51, the special-shaped mesh cover 52, the air guide ring 53, and the rectifier 54 connected to the rear guide vane group 51 can be integrally manufactured by injection molding. While reducing costs, the strength of each component is enhanced, and the overall efficiency and protection of the axial flow fan 100 are effectively increased.

[0037] Specifically, the entire air guide ring assembly 5 is made of plastic material and is integrally formed by an injection mold, which can effectively enhance the structural advantages, cost-effectiveness, design flexibility, corrosion resistance, etc. of the assembly. The specific performance improvements are as follows.

[0038] Structural advantages: The integrated design reduces the connections between components, improves the strength and stability of the overall structure, and reduces the risk of failures caused by loose connections. Moreover, this design enables each part to work better together, optimizes the air flow path, reduces air leakage and turbulence, and improves the aerodynamic performance of the fan.

[0039] Cost-effectiveness: Integral injection molding by an injection mold is suitable for large-scale production. Compared with manufacturing each component separately and then assembling them, it can reduce the production process and assembly man-hours, and reduce the labor cost. At the same time, the use of connecting components is reduced, and the material cost is also reduced. In addition, due to the simple overall structure, the later maintenance is convenient, which can further reduce the maintenance cost.

[0040] Design flexibility: Injection molding of plastic materials can achieve complex geometric shapes and fine structural designs, meet the special design requirements of different fans for the special-shaped mesh cover 52, the rear guide vane 511, and the air guide ring 53, and facilitate engineers to optimize the design according to the actual application scenario, improving the performance and appearance of the fan.

[0041] Corrosion resistance: Most plastics have good corrosion resistance and can adapt to various harsh environments, such as humid places and places with corrosive gases, extending the service life of the fan and reducing component damage and replacement frequency caused by corrosion.

[0042] Of course, the implementation manner of the present invention is not limited to this. The rear guide vane 511 can also be fixed inside the air guide ring 53 by welding, bolt connection, or snap connection, etc., and together with components such as the disc rib 521, etc., form an air flow channel. The special-shaped mesh cover 52 can also be installed outside the air guide ring 53 and connected to the air guide ring 53 by bolts, snap connections, or nesting. The rectifier 54 is installed at a suitable position inside the air guide ring 53 and may be fixed to the air guide ring 53 by welding or bolts, etc., to further rectify the air flow.

[0043] Please refer to Figure 3, in this embodiment, the 8 post-guide vane groups 51 are evenly spaced circumferentially around the central axis 4a, and are circumferentially positioned 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 respectively. The post-guide vane groups 51 that diverge uniformly from the outer wall of the straightener 54 can straighten the air flow flowing out of the impeller 4, comb the air flow with a rotational component into an axial flow, reduce turbulence and eddy currents, and reduce energy loss; at the same time, it can also convert part of the rotational kinetic energy of the air flow into pressure energy, increasing the static pressure and air supply range at the outlet of the fan. In an alternative embodiment, the post-guide vane groups 51 can be randomly spaced around the straightener 54 in the circumferential direction of the central axis 4a.

[0044] Please refer to Figures 8-9 , in an embodiment of the present invention, taking the central axis 4a as the center line, cylindrical surfaces of ∅220, ∅320, ∅420, ∅520, ∅620, and ∅720 are drawn, which respectively intersect with the curved surface of the post-guide vane 511. The generated cross-sections are as shown in the figure. The chord length of the cross-section is L, 30 mm ≤ L ≤ 270 mm, and the elevation angle of the cross-section is α, 30 degrees ≤ α ≤ 75 degrees.

[0045] Specifically, please refer to Figures 10-15 , in this embodiment, for the cross-section at ∅220, α = 44 degrees and L = 69.3 mm; for the cross-section at ∅320, α = 41 degrees and L = 70 mm; for the cross-section at ∅420, α = 51 degrees and L = 68.8 mm; for the cross-section at ∅520, α = 58 degrees and L = 65.3 mm; for the cross-section at ∅620, α = 61 degrees and L = 62.3 mm; for the cross-section at ∅720, α = 61 degrees and L = 62.4 mm; The post-guide vane 511 with such an efficient noise reduction curved surface can increase the air flow range, reduce losses, and improve the overall efficiency. The specific performance improvements are as follows.

[0046] Optimizing the air flow direction and energy recovery: The setting of the post-guide vane 511 can further guide and straighten the air flow accelerated by the impeller 4. It can adjust the air flow with a certain rotational speed at the outlet of the impeller 4 into an axial flow, reduce the swirl loss of the air flow, and improve the energy utilization rate of the air flow. By reasonably designing the shape, angle, and number of the post-guide vane 511, the air flow 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.

[0047] Noise and Vibration Reduction: The trailing guide vane 511 can effectively reduce the noise and vibration caused by air flow rotation and turbulence. During the operation of the fan, if the air flow at the outlet of the impeller 4 is not adjusted by the trailing guide vane 511, large swirls and pulsations will occur, leading to increased noise and vibration. Through the rectification of the air flow, the trailing guide vane 511 makes the air flow more stable, reduces the unstable factors of the air flow, thereby reducing the noise and vibration generated during the operation of the fan, and improving the operation stability and comfort of the fan.

[0048] Please refer to Figure 3 , in an embodiment of the present invention, each disk rib 521 extends from the back surface of the front trailing guide vane 511 to the front surface of the rear trailing guide vane 511 respectively, and every 8 disk ribs 521 can enclose a roughly annular structure. All the layer annular structures of the special-shaped mesh cover 52 are centered on the central axis and continuously expand radially outwards, and the layer annular structures are arranged at intervals. In this embodiment, the layer annular structures of the special-shaped mesh cover 52 are evenly spaced apart, and the adjacent two layer annular structures are spaced 9.5 mm apart.

[0049] Moreover, the disk ribs 521 of the same annular structure are not in the same plane, but are roughly annular in the axial view, which is determined by the connection of each disk rib 521 at the trailing guide vane 511. Preferably, please refer to Figure 1 and 2 , the axial distribution state of the disk rib 521 is special-shaped, extending from the top of the back surface of the first trailing guide vane 511 to the bottom of the front surface of the second trailing guide vane 511. Its function is to simplify the structure of the forming die, enabling it to form the product through simple opening and closing of the die without causing unnecessary material waste. The specific benefits are as follows.

[0050] Low Die Cost: The axial distribution of the special-shaped mesh cover 52 can simplify the structure of the forming die, eliminating the need for complex die design and manufacturing processes. The product can be formed through simple opening and closing of the die, reducing the die development cost and cycle, and improving production efficiency.

[0051] High Material Utilization Rate: Its unique design of the distribution of the disk ribs 521 does 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.

[0052] Good Air Guiding Performance: The disk ribs 521 distributed at intervals with the center of the air guiding ring 53 and the rectifier 54 as the center in the radial direction help to optimize the air flow guidance, making the air intake of the fan more uniform and stable, improving the overall air guiding efficiency of the fan, and thus enhancing the performance of the fan.

[0053] Reasonable structural strength: This peculiarly-shaped distributed ribbed plate 521 structure can ensure a certain structural strength of the mesh cover while meeting the ventilation requirements, can withstand a certain external force impact, and guarantee the safety and stability of the fan operation.

[0054] Facilitate production and manufacturing: The simple mold forming method reduces the difficulty of production and manufacturing, has relatively low technical requirements for operators, is conducive to expanding the production scale, and the consistency of product quality is easier to ensure.

[0055] In an embodiment of the present invention, the design process of the ribbed plate 521 is as follows.

[0056] Step 1. Draw the projection lines and offset lines of the rear guide vanes 511: Taking the fixed surface of the air guide ring 53 as the drawing plane, project the edge lines of the first and second rear guide vanes 511 as the first and second rear guide vane projection lines, and offset 4.5 mm to both sides to obtain the first and second rear guide vane projection offset lines; Step 2. Draw the inner and outer side trajectory lines of the top and bottom of the ribbed plate 521: Connect the outer end points of the first rear guide vane 511 projection line and the outer end points of the second rear guide vane 511 projection offset line, and project them onto the inner side wall of the air guide ring 53 to form the outer side trajectory line of the top of the ribbed plate 521; Connect the inner end points of the first rear guide vane 511 projection line and the inner end points of the second rear guide vane 511 projection offset line, and project them onto the outer side wall of the rectifier 54 to form the inner side trajectory line of the top of the ribbed plate 521; Similarly, obtain the outer side trajectory line of the bottom of the ribbed plate 521 and the inner side trajectory line of the bottom of the ribbed plate 521; Step 3. Draw the top and bottom construction surfaces of the ribbed plate 521: Taking the first rear guide vane 511 projection line, the second rear guide vane 511 projection offset line, the outer side trajectory line of the top of the ribbed plate 521, and the inner side trajectory line of the top of the ribbed plate 521 as the four sides to draw the top construction surface of the ribbed plate 521; Taking the first rear guide vane 511 projection offset line, the second rear guide vane 511 projection line, the outer side trajectory line of the bottom of the ribbed plate 521, and the inner side trajectory line of the bottom of the ribbed plate 521 as the four sides to draw the bottom construction surface of the ribbed plate 521; Step 4. Draw the peculiarly-shaped ribbed plate 521: Taking the fixed surface of the air guide ring 53 as the drawing plane, draw the cross-section of the ribbed plate 521, and radially expand it outward. After the cross-section of the ribbed plate 521 is drawn, stretch it upward to the top construction surface of the ribbed plate 521 and terminate at the bottom construction surface of the ribbed plate 521. The peculiarly-shaped ribbed plate 521 is drawn.

[0057] Step 5. Chamfering treatment of the peculiarly-shaped ribbed plate 521: Perform unequal-sided chamfering on the four sharp corners around the peculiarly-shaped ribbed plate 521, then perform full-round chamfering on the two sharp corners at the top and bottom, and finally perform process fillet treatment on the four corners on the side; Step 6. The peculiarly-shaped mesh cover 52 is drawn, and the cross-section of the peculiarly-shaped ribbed plate 521 of the mesh cover is as shown in the figure.

[0058] Figure 6 It is a cross-sectional view of the special-shaped disk rib 521 of the wire mesh cover. The cross-sectional width is A, where 2 mm ≤ A ≤ 7 mm; the cross-sectional height is B, where 3 mm ≤ B ≤ 15 mm; the angle between the cross-sectional chamfer and the side is β, where 100° ≤ β ≤ 170°.

[0059] In this embodiment, for embodiment A = 3.5 mm, B = 6 mm, and β = 160°.

[0060] Please refer to Figure 3 , in an embodiment of the present invention, the air guide ring 53 has a structure with a special-shaped edge 531. The special-shaped edge 531 is integrally connected to the outer wall at the air inlet of the air guide ring 53. Its shape is special, not a conventional shape. The overall shape is a rectangle with four corners cut off, approximately similar to an octagon structure. The special-shaped edge 531 forms 8 approximately trapezoidal mounting parts. Mounting holes are provided on the mounting parts and are fixedly connected to the fan panel by means of screws, rivets, etc. The benefits of the special-shaped edge 531 are as follows.

[0061] Material saving: The design of the rectangular special-shaped edge 531 with four corners cut off reduces the material usage compared to the conventional shape. While ensuring the performance of the air guide ring 53, it effectively reduces the raw material cost and avoids unnecessary waste.

[0062] Volume reduction: The unique special-shaped structure helps to reduce the occupied space at the bottom of the air guide ring 53, thereby reducing the volume of the entire fan product. It has more advantages in an installation environment with limited space and is also convenient for product transportation and packaging.

[0063] Weight reduction: The reduction in material usage directly leads to a decrease in the weight of the air guide ring 53. This not only facilitates the installation and handling of the fan but also reduces the load during fan operation and energy consumption.

[0064] Strong adaptability: The shape of the special-shaped edge 531 can better match other components of the fan, enhancing the compactness and stability of the connection between components and improving the reliability of the overall structure of the fan.

[0065] Please refer to Figure 4 , in this embodiment, to save materials, the special-shaped edge 531 also forms an arc-shaped notch. The corresponding diameter of the arc-shaped notch is D1, where 300 mm ≤ D1 ≤ 1000 mm; the outer edge of the mounting part of the special-shaped edge 531 corresponds to a diameter D2, where 330 mm ≤ D2 ≤ 1030 mm; the angle between the hypotenuse and the central radial line of the arc-shaped notch is γ, where 60° ≤ γ ≤ 90°. In the embodiment, D1 = 775 mm, D2 = 825 mm, and γ = 85°.

[0066] Please refer to Figure 1, in an embodiment of the present invention, the rectifier 54 is a rotating body constructed around the central axis 4a. The rectifier 54 has an outer wall. One end of the rear guide vane 511 away from the inner wall of the air guide ring 52 is connected to the outer wall of the rectifier 54, and the other end is connected to the inner wall of the air 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 one end facing away from the impeller 4 has a circular groove that is recessed inwardly in a cylindrical shape. The specific performance improvements are as follows.

[0067] Optimize the air flow direction: The rectifier 54 is located at the air outlet of the fan and behind the motor 3, which can effectively block the air flow from flowing back to the middle of the impeller 4, avoid the interference of the air flow with each other, make the air flow discharged from the fan smoother, reduce the turbulent flow phenomenon, and improve the overall aerodynamic performance of the fan.

[0068] Improve the fan efficiency: Reducing the turbulent flow means that the energy loss of the fan during operation is reduced, and the air flow can be discharged from the fan more efficiently. This helps to improve the working efficiency of the fan, and a larger air volume output can be achieved under the same energy consumption, or the energy consumption can be reduced under the same air volume requirement.

[0069] Reduce the operating noise: The reduction of the turbulent flow can reduce the noise generated by the irregular movement of the air flow, make the fan operate more quietly, improve the comfort of the use environment, and is especially suitable for places with high noise requirements, such as offices, hospitals, etc.

[0070] Prolong the equipment life: The stable air flow state can reduce the uneven stress on the impeller 4 and other internal components, reduce the wear degree of the components, and reduce the probability of failures, thereby prolonging the service life of the fan equipment and reducing the maintenance cost.

[0071] Simple and practical structure: The overall structure is a cylinder with the top removed, and the design is simple, which is convenient for manufacturing and installation. While ensuring effective rectification, it will not bring too much complexity to the production and assembly of the fan, which is conducive to large-scale production and application.

[0072] During the air flow process, the panel 1 plays a certain role in restricting and initially guiding the air flow, while the additional air guide ring 53 further guides the air flow, making the air flow more stable and concentrated towards the outlet, reducing the turbulence and energy loss of the air flow. Finally, the accelerated and guided air is discharged from the fan outlet to achieve the ventilation and air exchange or gas transportation function of the fan.

[0073] Preferably, the rectifier 54 is provided with a water dripping hole 54a along the central axis 4a. If the fan operates in an environment with high humidity, when condensate or other liquids accumulate on the surface of the air guide ring assembly 5, the water dripping hole 54a can allow the liquid to drain smoothly, preventing the liquid from entering the fan interior and affecting the normal operation of the fan.

[0074] Figures 16-20An embodiment of the axial flow fan provided by the present invention is shown in the figure 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 the 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 is located downstream of the impeller 4. The special-shaped edge 531 of its air guide ring 53 is provided with screw holes and is fixed to the panel 1 by screws.

[0075] The overall working process of the axial flow fan 100 is as follows: After the motor 3 is powered on, it starts to operate, converts electrical energy into mechanical energy, and drives the impeller 4 to rotate at a high speed through the output shaft 31. The blades of the impeller 4 push the surrounding air, enabling the air to obtain speed and kinetic energy, and the air is quickly sucked into the interior of 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 higher speed and with higher kinetic energy.

[0076] During the air flow process, the panel 1 plays a certain role in restricting and initially guiding the air flow, while the additional air guide ring 53 further guides the air flow, making the air flow more stable and concentrated towards the outlet, reducing the disorder and energy loss of the air flow. Finally, the air that has been accelerated and guided flows out from the fan outlet, realizing the ventilation and air exchange or gas transportation function of the fan.

[0077] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as within the scope described in this specification.

[0078] The above embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An air guide ring assembly (5), arranged at the rear side of 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) comprises: a plurality of trailing guide vanes (511) constituting a trailing guide vane group (51), each trailing guide vane (511) comprising a shape and orientation corresponding to airflow conditions leaving the trailing guide vane group (51), the plurality of trailing guide vanes (511) being spaced circumferentially around the central axis (4a); a plurality of coil ribs (521) constituting the special-shaped mesh cover (52), the special-shaped mesh cover (52) being distributed in a multi-layered ring shape with the central axis (4a) as the center, each coil rib (521) extending from the blade surface of the preceding rear guide vane (511) to the blade surface of the following rear guide vane (511); and, An air guide ring (53) is continuously arranged around the central axis (4a), the hollow portion of the air guide ring (53) forms an air duct (53a), and the rear guide vane group (51) and the special-shaped mesh cover (52) are both arranged in the air duct (53a).

2. The air guide ring assembly (5) according to claim 1, characterized in that: The air guide ring assembly (5) is integrally injection molded.

3. The air guide ring assembly (5) according to claim 1, characterized in that: A plurality of rear guide vanes (511) are evenly spaced apart in the circumferential direction around the central axis (4a).

4. The air guide ring assembly (5) according to claim 1, characterized in that: With the central axis (4a) as the center line, cylindrical surfaces of ∅220, ∅320, ∅420, ∅520, ∅620, and ∅720 are drawn to intersect with the curved surface of the rear guide vane (511), respectively. In the generated cross section, the cross section chord length is L, 30 mm ≤ L ≤ 270 mm, and the cross section elevation angle is α, 30 degrees ≤ α ≤ 75 degrees.

5. The air guide ring assembly (5) according to claim 1, characterized in that: Each rib (521) extends from the back side of a preceding rear guide vane (511) to the front side of a succeeding rear guide vane (511).

6. The air guide ring assembly (5) according to claim 5, characterized in that: Each rib (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).

7. The air guide ring assembly (5) according to claim 1, characterized in that: Each layer of the annular structures of the special-shaped mesh cover (52) is evenly spaced apart.

8. The air guide ring assembly (5) according to claim 1, characterized in that: It also includes a rectifier (54), 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).

9. The air guide ring assembly (5) according to claim 8, characterized in that: The rectifier (54) is a rotating body constructed around the central axis.

10. The air guide ring assembly (5) according to claim 8, characterized in that: The rectifier (54) is provided with a drip hole (54a) along the central axis (4a).

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