Outer axial flow fan cover structure

Abstract

The utility model relates to the technical field of axial flow fan structures, in particular to an outer axial flow fan cover structure, which comprises an integrally formed cover plate main body, and is characterized in that an axially through cylindrical mounting through hole is formed in the center of the cover plate main body, and an annular positioning arc groove is formed in the periphery of the top of the mounting through hole; four U-shaped mounting holes are evenly distributed in the peripheral edge of the cover plate body, and the central axes of the U-shaped mounting holes are parallel to the axis of the mounting through hole. According to the outer axial flow fan cover structure, through the integral forming design and in combination with multiple optimization characteristics, the functionality, reliability and maintenance convenience of a fan are remarkably improved, and the service life of the fan is prolonged. The integral structure of the cover plate body enhances the overall strength, avoids the problem of stress concentration caused by traditional splicing or welding, and is suitable for the working condition of high-speed operation. The annular positioning arc grooves and the U-shaped mounting holes ensure accurate alignment of the fan cover and the motor shaft or the shell, vibration caused by assembly errors is reduced, and meanwhile mounting and adjusting are facilitated.

Description

Technical Field

[0001] This utility model relates to the technical field of axial flow fan structure, and in particular to an external axial flow fan cover structure. Background Technology

[0002] External axial flow fans are widely used in industrial ventilation, cooling systems, and new energy equipment. Their cover structure directly affects the fan's operating efficiency, stability, and service life. Traditional fan covers typically use a split-piece welded or bolted structure, which suffers from large assembly errors, easy deformation, and high vibration and noise. Furthermore, some fan covers lack airflow optimization design, resulting in high wind resistance and low heat dissipation efficiency; insufficient waterproofing and dustproofing capabilities, leading to rust or blockage after long-term use; requiring complete disassembly for maintenance, increasing maintenance costs; and difficulty in dynamic balance adjustment, resulting in significant vibration at high speeds. These shortcomings limit the fan's performance improvement and application range.

[0003] Chinese patent discloses a non-machining external rotor axial flow fan end cover (publication number: CN 203532334U), which includes a cover body with guide ribs for engaging with the marking grooves of the stator to be assembled. The guide ribs are elongated semi-cylindrical with semi-conical front ends. The root of the part of the cover body that engages with the stator to be assembled has several chip storage grooves. However, the axial flow fan end cover structure has problems such as low assembly accuracy, high vibration and noise, poor airflow efficiency, weak waterproof and dustproof capabilities, inconvenient maintenance, and difficulty in dynamic balance adjustment. Therefore, an external axial flow fan cover structure is needed. Utility Model Content

[0004] The purpose of this utility model is to solve the problems of low assembly accuracy, high vibration and noise, poor airflow efficiency, weak waterproof and dustproof capabilities, inconvenient maintenance, and difficulty in dynamic balance adjustment that are common in the existing technology of traditional axial flow fan end cover structures. Therefore, an external axial flow fan cover structure is proposed.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: The external axial flow fan cover structure of this utility model includes an integrally formed cover plate body. Its features include: an axially penetrating cylindrical mounting hole at the center of the cover plate body; an annular positioning groove on the outer periphery of the top of the mounting hole; four U-shaped mounting holes evenly distributed along the outer periphery of the cover plate body; the central axis of the U-shaped mounting holes being parallel to the axis of the mounting hole; and several assembly positioning marking points on one side of the cover plate body surface. Structural stability: Integral molding avoids stress concentration caused by welding or splicing, improving overall strength, especially suitable for high-speed rotation scenarios; Precise positioning: The annular groove and U-shaped mounting holes cooperate to ensure the concentricity of the fan cover with the motor shaft or housing, reducing vibration caused by assembly deviations; Quick installation: Marking points intuitively indicate the assembly direction, reducing the difficulty of manual alignment and improving production line efficiency; Versatility: The U-shaped mounting holes are compatible with different bolt specifications, allowing for a certain degree of adjustment in the installation position.

[0006] Preferably, the outer periphery of the bottom of the cover plate body is evenly distributed with four U-shaped positioning protrusions. The height of the U-shaped positioning protrusions is 1-2mm. A flow guide array is provided on the U-shaped positioning protrusions, and each group of the flow guide array contains a 3×5 rectangular rib matrix. The protrusions form a small gap to absorb high-frequency vibrations during operation and reduce noise transmission; the rib matrix guides the airflow through the bottom of the cover plate in an orderly manner, reducing eddy current generation and improving fan efficiency; the height of the protrusions prevents the cover plate from directly contacting the base, preventing the accumulation of debris from affecting heat dissipation.

[0007] Preferably, the bottom of the flow guide array has several drainage holes at equal intervals. This allows for the rapid drainage of rainwater or condensate, preventing liquid stagnation that could lead to corrosion of metal components. As water flows through the drainage holes, it can also carry away some of the attached dust, reducing maintenance frequency.

[0008] Preferably, the mounting through hole has three axially extending airflow guide grooves, the inner walls of which are all rounded. The guide grooves guide the airflow axially, reducing turbulent energy loss; the rounded corner design prevents sharp edges from scratching the shaft or seals, extending service life.

[0009] Preferably, an oil filling hole is provided on one side of the cover plate body, and a plug is installed on the oil filling hole. Lubricating grease can be replenished without disassembling the entire cover plate, reducing maintenance costs; the plug design prevents grease from overflowing and contaminating other components.

[0010] Preferably, the bottom of the cover plate body is evenly distributed with counterweight grooves around its perimeter, and each counterweight groove contains a detachable counterweight block. By adding or removing counterweight blocks, imbalances caused by manufacturing tolerances or wear can be compensated to adapt to different speed requirements; precise counterweighting suppresses centrifugal force fluctuations during rotation, improving operational stability.

[0011] The advantages of this utility model are:

[0012] The external axial flow fan cover structure of this application, through its one-piece molding design and combined with multiple optimized features, significantly improves the functionality, reliability, and ease of maintenance of the fan. The integrated structure of the cover body enhances overall strength, avoiding stress concentration problems caused by traditional splicing or welding, making it suitable for high-speed operation. The annular positioning groove and U-shaped mounting holes ensure precise alignment between the fan cover and the motor shaft or housing, reducing vibration caused by assembly errors and facilitating installation and adjustment. Assembly positioning marks simplify the installation process and improve production line efficiency. The U-shaped positioning boss and airflow guide array optimize airflow path, reduce turbulence noise, and prevent dust accumulation. The drainage hole design effectively discharges condensate or rainwater, preventing corrosion and extending service life. The airflow guide groove reduces wind resistance, improves airflow efficiency, and protects the shaft from wear. The oil injection hole and plug make lubrication and maintenance more convenient, reducing downtime. The adjustable weight allows for dynamic balance adjustment to adapt to different speed requirements, suppressing vibration and noise. Attached Figure Description

[0013] 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 drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the structure of this utility model.

[0016] Figure 3 This is a schematic diagram of the bottom structure of this utility model.

[0017] In the diagram: 1. Mounting through hole; 2. Cover plate body; 3. Annular positioning groove; 4. Airflow guide groove; 5. U-shaped mounting hole; 6. Plug; 7. Removable counterweight; 8. Guide array; 9. Drain hole; 10. U-shaped positioning boss. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0019] Example

[0020] Please see Figure 1-3 As shown, an external axial flow fan cover structure includes an integrally formed cover plate body 2. The cover plate body 2 is characterized by: an axially penetrating cylindrical mounting hole 1 at its center; an annular positioning groove 3 on the outer periphery of the top of the mounting hole 1; four U-shaped mounting holes 5 evenly distributed along the outer periphery of the cover plate body 2; the central axis of the U-shaped mounting holes 5 being parallel to the axis of the mounting hole 1; and several assembly positioning marking points on one side of the cover plate body surface. Structural stability: The integral molding avoids stress concentration caused by welding or splicing, improving overall strength, especially suitable for high-speed rotation scenarios; Precise positioning: The annular groove and U-shaped mounting holes 5 cooperate to ensure the concentricity of the fan cover with the motor shaft or housing, reducing vibration caused by assembly deviations; Quick installation: The marking points intuitively indicate the assembly direction, reducing the difficulty of manual alignment and improving production line efficiency; Versatility: The U-shaped mounting holes 5 are adaptable to different bolt specifications, allowing for a certain degree of adjustment in the installation position.

[0021] In this embodiment, four U-shaped positioning protrusions 10 are evenly distributed on the outer periphery of the bottom of the cover plate body 2. The height of each U-shaped positioning protrusion 10 is 1-2mm. A flow guide array 8 is provided on each U-shaped positioning protrusion 10, and each group of the flow guide array 8 contains a 3×5 rectangular rib matrix. The protrusions form tiny gaps to absorb high-frequency vibrations during operation and reduce noise transmission; the rib matrix guides airflow through the bottom of the cover plate in an orderly manner, reducing eddy current generation and improving fan efficiency; the height of the protrusions prevents the cover plate from directly contacting the base, preventing the accumulation of debris from affecting heat dissipation.

[0022] In this embodiment, the bottom of the flow guiding array 8 is provided with a plurality of drainage holes 9 at equal intervals. This allows for the rapid discharge of rainwater or condensate, preventing liquid stagnation that could lead to corrosion of metal components. Water flowing through the drainage holes 9 can also carry away some of the attached dust, reducing the frequency of maintenance.

[0023] In this embodiment, the mounting through hole 1 is provided with three axially extending airflow guide grooves 4, and the inner walls of the airflow guide grooves 4 are all rounded. The guide grooves guide the airflow along the axial direction, reducing turbulent energy loss; the rounded corner design avoids sharp edges from scratching the shaft or seals, extending service life.

[0024] In this embodiment, an oil filling hole is provided on one side of the cover plate body 2, and a plug 6 is installed on the oil filling hole. Lubricating grease can be replenished without disassembling the entire cover plate, reducing maintenance costs; the plug 6 is designed to prevent grease from overflowing and contaminating other components.

[0025] In this embodiment, the bottom of the cover plate body 2 is evenly distributed with counterweight grooves, and each counterweight groove is equipped with a detachable counterweight 7. By adding or removing counterweights, imbalances caused by manufacturing tolerances or wear can be compensated to adapt to different speed requirements; precise counterweighting suppresses centrifugal force fluctuations during rotation and improves operational stability.

[0026] The implementation principle of this embodiment is as follows:

[0027] 1. Installation and Positioning Phase

[0028] When the fan cover needs to be installed on the motor or drive shaft: the mounting through hole 1 fits onto the motor shaft to ensure that the fan cover and the shaft remain coaxial and avoid eccentric rotation. The annular positioning groove 3 holds the bearing or seal ring to help with precise positioning and prevent the cover from tilting. The U-shaped mounting hole 5 is fixed to the fan housing with bolts. The position can be finely adjusted as needed during installation to adapt to different installation environments. The assembly positioning mark points are marked on the surface of the cover to indicate the alignment position, so that workers can quickly find the correct direction and reduce the possibility of incorrect installation.

[0029] 2. Operational Phase

[0030] When the fan starts, as the airflow passes through the cover plate: the airflow guide array 8 (3×5 rib matrix) guides the airflow along the set direction, reducing turbulence, lowering noise, and improving airflow efficiency; the airflow guide groove 4 (three axial grooves) further optimizes the airflow path, allowing the air to pass through more smoothly and reducing energy loss; the U-shaped positioning boss 10 keeps a 1-2mm gap between the bottom of the cover plate and the mounting surface, avoiding direct contact that generates friction noise, and preventing dust accumulation.

[0031] 3. Waterproofing and self-cleaning stage

[0032] When the fan is running in a humid environment (such as outdoors or in high humidity conditions): Drain hole 9 allows rainwater or condensate to flow away quickly and not accumulate inside the cover plate, thus avoiding rust or corrosion.

[0033] 4. Maintenance and Balancing Adjustment Phase

[0034] When the fan needs maintenance or adjustment after long-term operation: Lubricating grease can be directly added to the oil filling hole without removing the entire cover, saving time and effort. The plug 6 seals the oil filling hole to prevent grease leakage or dust from entering. The counterweight groove and the removable counterweight 7 can adjust the weight distribution when the fan vibration increases. For example, if a certain position is too heavy, add some counterweight to make the operation more stable.

[0035] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An outer axial flow fan cover structure comprising a cover plate main body (2) which is integrally formed, characterized in that The center of the cover plate body (2) is provided with an axial through cylindrical mounting hole (1), the top outer periphery of the mounting hole (1) is provided with an annular positioning arc groove (3), the outer periphery edge of the cover plate body (2) is uniformly provided with four U-shaped mounting holes (5), the center axis of the U-shaped mounting hole (5) is parallel to the axis of the mounting hole (1), and one side of the surface of the cover plate body is provided with a plurality of assembly positioning mark points.

2. The outer shaft blower cover structure according to claim 1, wherein: The outer periphery edge of the bottom of the cover plate body (2) is uniformly provided with four U-shaped positioning bosses (10), the height of the U-shaped positioning boss (10) is 1-2mm, the U-shaped positioning boss (10) is provided with a flow guide array (8), and each group of the flow guide array (8) contains a 3x5 rectangular rib matrix.

3. An outer shaft blower cover structure according to claim 2, wherein: The bottom of the flow guide array (8) is provided with a plurality of drainage holes (9) at equal intervals.

4. The outer shaft blower cover structure of claim 1, wherein: The inside of the mounting hole (1) is provided with three axial extending air flow guide grooves (4), and the inner walls of the air flow guide grooves (4) are all rounded.

5. The outer shaft blower cover structure of claim 1, wherein: One side of the cover plate body (2) is provided with an oil injection hole, and the oil injection hole is provided with a plug (6).

6. The outer shafted fan cover structure of claim 1, wherein: The bottom of the cover plate body (2) is uniformly provided with a counterweight groove around, and the counterweight groove is provided with a detachable counterweight block (7).

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