Reinforced mesh enclosure for axial flow fan
Through the dual support frame structure and bolt fixing technology of cold bent single flat steel, the problems of traditional mesh strength increase cost and welding defects are solved, and higher stability and service life are achieved, while avoiding welding defects on the equipment The impact of
Patent Information
- Application Number
- CN202421122304.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-22
AI Technical Summary
Traditional axial flow fan mesh covers increase material cost and processing complexity when increasing strength, and welding defects may affect the stability and service life of the equipment.
A single flat steel cold-bending double-support frame structure replaces the traditional two flat steel support frames, and fixes the motor with bolts and the center mounting plate and support frame to increase contact surfaces to improve stability, while adding additional contact during welding. Bolts are fixed to avoid welding defects.
Without increasing cost and complexity, the strength of the mesh cover and the stability and service life of the axial flow fan are improved, and the welding defects do not affect the normal use of the equipment.
Smart Images
Figure CN222254459U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the "technical field of ventilation equipment" and the "technical field of mesh cover manufacturing", and in particular to a reinforced mesh cover for an axial flow fan. Background Art
[0002] In the field of ventilation equipment technology, axial flow fans are a common type of equipment. Their main function is to generate air flow through rotating blades, thereby achieving the purpose of ventilation. In the structure of axial flow fans, the mesh cover is a key component. Its main function is to protect the mechanical structure inside the fan, prevent foreign matter from entering, ensure the normal circulation of air, and provide support for the fan.
[0003] In the field of mesh manufacturing technology, it is usually necessary to weld multiple metal wires to the main ribs to form a mesh structure with a certain shape and strength. For larger fans, the traditional manufacturing method generally uses two identical flat steels arranged in parallel and welded to the center mounting plate, and fixed to the motor through the positioning holes on the center mounting plate. Since the support bracket and the center mounting plate are welded, if welding defects such as cold welding and leaking welding occur, the quality and use of the mesh will be directly affected. In traditional designs, in order to improve the strength of the mesh, the method generally used is to increase the thickness of the flat steel of the main support bracket and increase the diameter or number of the mesh body ribs. Although this method improves the strength of the mesh, it will also increase material costs and processing steps. Utility Model Content
[0004] In order to solve the above technical problems, the utility model designs a reinforced mesh cover for axial flow fans. Compared with the prior art, the technical solution mainly solves how to improve the strength of the mesh cover without increasing the manufacturing cost and complexity of the mesh cover, thereby improving the stability and service life of the axial flow fan. At the same time, it solves the problem that even if there are undiscovered welding defects between the support bracket and the central mounting plate during the production process, it will not affect the use of the mesh cover.
[0005] The utility model adopts the following technical solutions:
[0006] A reinforced mesh cover for an axial flow fan, comprising a support bracket and a mesh cover body composed of a center mounting plate and plate ribs, the support bracket being arranged radially along the mesh cover body, the support bracket being formed by cold bending of a single flat steel into a double support frame structure, replacing the two flat steels in the traditional process, the double support frame structure comprising two support bracket bending sections and a support bracket smooth transition section integrally connected between the two support bracket bending sections, a support bracket positioning hole being provided on the support bracket smooth transition section corresponding to the center mounting plate, the support bracket smooth transition section being welded and fixed to the center mounting plate, the center mounting plate being uniformly distributed with mounting holes in the circumferential direction with the same number as the support bracket, and being fixed to the support bracket and the motor by bolts.
[0007] Preferably, the mesh cover body is composed of a plurality of concentrically arranged ribs, or a single rib coiled wire.
[0008] Preferably, the supporting brackets are at least 3 groups, which are evenly arranged in radially equal parts along the mesh cover body.
[0009] Preferably, the central mounting plate of the mesh cover body is a continuous integral disc or a plurality of discontinuous mounting plates fixed only to the smooth transition section of the support bracket. Alternatively, if the strength and rigidity of the mesh cover meet the design requirements, the central mounting plate can be removed and the motor can be fixed to the mesh cover support bracket.
[0010] Preferably, the support bracket bending section includes support bracket bending section one, support bracket bending section two, and support bracket bending section three.
[0011] Preferably, the angle θ1 between the first support bracket bending section and the second support bracket bending section ranges from 90° to 150°, and transitions evenly in the form of a rounded corner.
[0012] Preferably, the angle θ2 between the second support bracket bending section and the third support bracket bending section ranges from 90° to 150°, and transitions evenly in the form of a rounded corner.
[0013] Preferably, the angle θ3 between the support bracket bending section 3 and the support bracket smooth transition section is in the range of 90° to 150°, and the transition is uniform in the form of a rounded corner, so as to ensure processability and improve the strength of the mesh cover.
[0014] Preferably, the middle bending distance L of the support bracket is k times the diameter of the positioning hole of the support bracket, and the value range of k is 1.5~5.
[0015] Preferably, the spacing between the concentric ribs, the spacing between the single rib wires, and the distance between the concentric ribs and the single rib wires and the impeller meet safety standards.
[0016] The beneficial effects of the utility model are as follows: (1) the double support bracket in the traditional mesh cover is two identical single support brackets arranged in parallel, while the utility model changes it into a double support bracket structure formed by cold bending of a single flat steel, thereby improving the strength of the mesh cover; (2) the motor of the traditional mesh cover is fixed to the central mounting plate of the mesh cover body by bolts, while the motor of the utility model is fixed to the central mounting plate of the mesh cover body and the support bracket by bolts, thereby increasing the contact surface stress components, reducing the contact surface stress, and improving the stability and service life of the axial flow fan; (3) the traditional mesh cover is only fixed by welding the support bracket and the central mounting plate. If welding defects such as cold welding and leaking welding occur, the quality of the mesh cover will be affected, and then the mesh cover will be unevenly stressed, the mesh cover will break, the vibration of the whole machine will increase, and the use of the axial flow fan will be affected; while the present design scheme adds bolt fixation on the basis of welding the support bracket to the central mounting plate. Even if undetected welding defects occur during the production process, it will not affect the normal use of the axial flow fan. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a three-dimensional structural diagram of the mesh cover of the utility model;
[0018] Figure 2 It is a partial view of the mesh cover support bracket of the utility model;
[0019] Figure 3 It is a cross-sectional view of the contact surface between the conventional grille support bracket and the central mounting plate;
[0020] Figure 4 It is a cross-sectional view of the contact surface between the mesh cover support bracket and the central mounting plate of the utility model;
[0021] Figure 5 It is a structural stereogram of the mesh cover support frame of the utility model;
[0022] Figure 6 It is a side view of the mesh cover support frame structure of the utility model;
[0023] Figure 7 It is the stress cloud diagram of the finite element calculation of the mesh cover of the utility model;
[0024] Figure 8 Calculate stress contours for traditional mesh finite element;
[0025] In the figure: 1. support bracket, 2. center mounting plate, 3. plate ribs, 4. mesh cover body, 11. support bracket bending section 1, 12. support bracket bending section 2, 13. support bracket bending section 3, 14. support bracket smooth transition section, 15. support bracket positioning hole. DETAILED DESCRIPTION
[0026] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:
[0027] Example: Figure 1-Figure 2 As shown, a reinforced mesh cover for an axial flow fan includes a mesh cover body 4 composed of a support bracket 1, a central mounting plate 2 and a plate rib 3. The diameter of the mesh cover body is 800 mm. Figure 5-Figure 6 As shown, the support bracket selects a single high-strength steel as the raw material, and adopts cold bending forming technology to accurately form the shape and size of the support bracket, forming a double support frame structure. The double support frame structure includes two support bracket bending sections and a support bracket smooth transition section 14 integrally connected between the two support bracket bending sections; the length of the support bracket is 390mm and the wall thickness is 5mm.
[0028] The supporting brackets are divided into 4 groups and evenly arranged along the radial direction of the mesh cover body.
[0029] The support bracket bending section includes a support bracket bending section 11, a support bracket bending section 2 12, and a support bracket bending section 3 13. The angle θ1 between the support bracket bending section 11 and the support bracket bending section 2 12 is 90°, and the fillet radius R1 is 20mm. The angle θ2 between the support bracket bending section 2 12 and the support bracket bending section 3 13 is 124°, and the fillet radius R2 is 25mm. The middle bending distance L of the support bracket is 50mm. The middle bending fillet R3 of the support bracket is 6.5mm. The support bracket smooth transition section is preset with a support bracket positioning hole 15, and the hole diameter is 11mm.
[0030] The double support bracket is welded and fixed to the central mounting plate. The inner ring diameter of the central mounting plate is 140 mm, the outer ring diameter is 210 mm, and the thickness is 4 mm. A mounting hole is preset on the central mounting plate at the same position as the support bracket, and the hole diameter is 11 mm.
[0031] The motor is connected to the support bracket and the central mounting plate by bolts. Specifically, high-strength stainless steel bolts can be selected. In this way, the stress at the motor connection is reduced, and the stability and service life of the whole machine are improved.
[0032] like Figure 3 and Figure 4As shown, the double support bracket in the traditional mesh cover is two identical single support brackets arranged in parallel, while the utility model changes it into a double support frame structure formed by cold bending of a single flat steel, thereby improving the strength of the mesh cover; the traditional mesh cover motor is fixed to the center mounting plate of the mesh cover body by bolts, while the utility model motor is fixed to the center mounting plate of the mesh cover body and the support bracket by bolts, increasing the contact surface stress components, reducing the contact surface stress, and improving the stability and service life of the axial flow fan; the traditional mesh cover is only fixed by welding the support bracket and the center mounting plate. If welding defects such as cold welding and leaking welding occur, the quality of the mesh cover will be affected, and then during use, the mesh cover will be unevenly stressed, the mesh cover will break, the vibration of the whole machine will increase, and the use of the axial flow fan will be affected; and the present design scheme adds bolt fixation on the basis of welding the support bracket to the center mounting plate. Even if undetected welding defects occur during the production process, it will not affect the normal use of the axial flow fan.
[0033] Finite element simulation calculation is performed on the mesh cover of this technical solution, and a comparative analysis is performed with the traditional mesh cover. The mesh cover body in the traditional mesh cover structure is the same as that of this technical solution, and the support bracket is two flat steels, and the support bracket length, bending angles θ1, θ2, θ3 and flat steel thickness are the same as those of this technical solution. The support bracket is welded and fixed to the center mounting plate. The support bracket material is Q235, and its yield strength is 235MPa. Figure 7 and Figure 8 The stress cloud diagram obtained by computing the finite element cloud of the present technical solution and the traditional mesh cover. It can be seen from the figure that under the same load conditions, the maximum stress of the mesh cover of the present technical solution is 105MPa, and the maximum stress of the traditional mesh cover is 112MPa. The stress value of the mesh cover of the present technical solution is reduced.
[0034] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.
Claims
1. A reinforced mesh cover for an axial flow fan, comprising a support bracket (1) and a mesh cover body (4) composed of a central mounting plate (2) and a plate rib (3), wherein the support bracket is arranged radially along the mesh cover body, and wherein: The support bracket (1) is formed by cold bending a single flat steel into a double support bracket structure, the double support bracket structure comprising two support bracket bending sections and a support bracket smooth transition section (14) integrally connected between the two support bracket bending sections, a support bracket positioning hole (15) is provided on the support bracket smooth transition section (14) corresponding to the central mounting plate (2), the support bracket smooth transition section is welded and fixed to the central mounting plate (2), the central mounting plate (2) is uniformly distributed along the circumferential direction with the same number of mounting holes as the support bracket (1), and is fixed to the support bracket and the motor by bolts.
2. The reinforced mesh cover for an axial flow fan according to claim 1, characterized in that: The mesh cover body (4) is composed of a plurality of concentrically arranged ribs, or a single rib coiled wire.
3. The reinforced mesh cover for an axial flow fan according to claim 1, characterized in that: The supporting brackets (1) are at least three groups, which are evenly arranged in equal parts along the radial direction of the mesh cover body (4).
4. The reinforced mesh cover for an axial flow fan according to claim 1, characterized in that: The central mounting plate (2) of the mesh cover body (4) is a continuous integral circular plate or a plurality of discontinuous mounting plates that are only fixed to the smooth transition section (14) of the support bracket.
5. The reinforced mesh cover for an axial flow fan according to claim 1, characterized in that: The support bracket bending section comprises a support bracket bending section 1 (11), a support bracket bending section 2 (12), and a support bracket bending section 3 (13).
6. The reinforced mesh cover for an axial flow fan according to claim 5, characterized in that: The angle θ1 between the first support bracket bending section (11) and the second support bracket bending section (12) is in the range of 90° to 150°, and is evenly transitioned in the form of a rounded corner.
7. The reinforced mesh cover for an axial flow fan according to claim 5, characterized in that: The angle θ2 between the second support bracket bending section (12) and the third support bracket bending section (13) is in the range of 90° to 150°, and is evenly transitioned in the form of a rounded corner.
8. The reinforced mesh cover for an axial flow fan according to claim 5, characterized in that: The angle θ3 between the support bracket bending section three (13) and the support bracket smooth transition section (14) is in the range of 90° to 150°, and the transition is uniform in the form of a rounded corner.
9. The reinforced mesh cover for an axial flow fan according to claim 1, characterized in that: The middle bending distance L of the support bracket (1) is k times the diameter of the support bracket positioning hole (15), and the value range of k is 1.5-5.
10. The reinforced mesh cover for an axial flow fan according to claim 2, characterized in that: The spacing between the concentric ribs, the spacing between the single rib wires, and the distance between the concentric ribs and the single rib wires and the impeller meet safety standards.