Anti-deformation structure reinforced vibration reduction optimization fan half casing
By introducing insertable reinforcing columns and reinforcing ribs into the centrifugal fan housing, the problems of housing deformation and vibration were solved, achieving efficient manufacturing and easy installation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI GENERAL FAN
- Filing Date
- 2025-09-10
- Publication Date
- 2026-07-14
AI Technical Summary
The existing centrifugal fan casing is prone to deformation during manufacturing and installation, resulting in uneven welding, affecting the appearance quality, and requiring cumbersome and time-consuming maintenance.
The fan casing is reinforced and optimized with an anti-deformation structure to reduce vibration. By setting interlocking reinforcing columns and reinforcing ribs between the upper and lower casings, combined with micro-connection processing technology, the assembly accuracy and strength are improved, and the vibration value is reduced.
It improved assembly precision and strength, reduced vibration by more than 30%, improved sealing performance, reduced welding time, and improved welding efficiency and overall reliability.
Smart Images
Figure CN224496893U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of elastic fluid variable displacement mechanical housing under IPC classification F04D29 / 40, and particularly relates to an improved technology for vibration-damping and deformation-resistant fan housing structure that balances structural performance and ease of fabrication, applicable to the fan equipment manufacturing industry. Background Technology
[0002] Centrifugal fans typically employ a volute structure.
[0003] Centrifugal fans typically employ vortex impellers, which create a spiral airflow through high-speed blade rotation for high-pressure gas transport. The centrifugal fan casing houses the impeller, volute, main shaft, and bearing housing. The casing can be integral or semi-open. Centrifugal fan casings are mainly divided into horizontally split and volute types. Horizontally split casings are suitable for low-pressure centrifugal fans; the casing is made of cast iron or welded steel plates, and the horizontal split structure facilitates maintenance. Volute casings are mostly used in single-stage centrifugal fans; the casing contains components such as a return chamber, baffles, and diffusers. Gas is pressurized by the impeller and then converted into pressure energy by the diffuser.
[0004] In mechanical structures, a half-face refers to a parting surface or mating surface. A centrifugal fan casing typically consists of planar side plates and curved volutes or spirals. Volutes are usually mounted on the top or bottom surface to form a complete spiral, while side plates are typically installed vertically on either side of the spiral.
[0005] Patent application 201620639432.1: A high-pressure two-stage split-type centrifugal fan casing, as shown in the attached... Figure 1 As shown, the device includes a front side plate, a rear side plate, and a volute housing. The front and rear side plates are connected by a half flange. The volute housing has several radially distributed C-shaped reinforcing ribs. The front side plate has a front side plate reinforcing channel steel ring and a front side plate reinforcing channel steel, and the rear side plate has a rear side plate reinforcing channel steel ring and a rear side plate reinforcing channel steel. The middle part of each C-shaped reinforcing rib is welded to the volute housing, and the two ends are welded to the front side plate reinforcing channel steel ring or the front side plate reinforcing channel steel and the rear side plate reinforcing channel steel ring or the rear side plate reinforcing channel steel, respectively. The beneficial effects of this structure are: it can improve the strength of the volute housing, significantly reduce the vibration values of the front and rear side plates, thereby preventing housing cracking.
[0006] In existing technologies, the typical three-section design of a wind turbine's half-casing includes horizontal and vertical split structures, facilitating maintenance. While half-casings are a common structure in wind turbine design, they often deform during manufacturing due to welding and other reasons, causing significant difficulties for on-site installation after delivery. Therefore, a new structure is needed to address these issues.
[0007] Currently, the housing half-flanged structure limits the material preparation process, necessitating the separate preparation of the side plates and volutes. Furthermore, the upper and lower housings are welded separately during the welding process. After spot welding, the upper and lower housings are connected with bolts before being fully welded together. This method leads to severe deformation of the upper and lower housings, causing misalignment of the half-flanged flange holes during assembly, requiring rework and affecting the appearance quality of the wind turbine. This is especially problematic during on-site maintenance, as disassembly and assembly are cumbersome and time-consuming. Utility Model Content
[0008] This utility model designs a deformation-resistant, vibration-damping, and optimized fan housing. Through structural improvements, the housing structure can balance support, sealing, and ease of maintenance while significantly improving welding and manufacturing efficiency.
[0009] Therefore, this utility model provides a deformation-resistant, vibration-damping, and optimized half-shell fan housing, comprising: a flange, a reinforcing column, an upper volute, an upper side plate, a lower volute, and a lower side plate; the housing adopts a two-part half-shell structure with an upper shell and a lower shell, the upper shell being fixedly connected by the upper volute and the upper side plate, and the lower shell being fixedly connected by the lower volute and the lower side plate, with mutually aligned weak connection edges between the upper and lower shells and the mating volutes or side plates; a flange is provided between the mating edges of the upper and lower shells; a reinforcing column is provided between the upper and lower sides of the flange, with the upper and lower sections of the reinforcing column respectively fixed to the upper and lower shells.
[0010] A mounting hole is provided laterally in the middle of the housing between the upper and lower housings. A base is provided at the bottom of the housing, i.e., the bottom of the lower housing. Reinforcing ribs 6 are fixed on the outer walls of the upper and lower housings. In particular, the reinforcing ribs fixed on the outer walls of the upper and lower housings are joined together to form a closed annular structure.
[0011] The insertion reinforcing post includes an upper post, a middle insertion post, and a lower post; wherein the two ends of the insertion reinforcing post are respectively inserted into the lower port of the upper post and the upper port of the lower post.
[0012] Furthermore, to achieve the above objectives, this utility model is configured as follows:
[0013] In particular, the reinforcing column adopts a square tube butt welding structure.
[0014] In particular, for linear continuous interval openings along the weak connection dividing line, or for gas cutting or plasma cutting along the weak connection dividing line, a groove with a allowance of 4.0 to 5.0 mm needs to be reserved, or a groove with a allowance of 4.0 to 5.0 mm needs to be reserved when milling the end face.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] Improve assembly precision: The fan casing adopts a two-part half-volute structure. The upper casing is fixedly connected by the upper volute plate and the upper side plate, and the lower casing is fixedly connected by the lower volute plate and the lower side plate. Moreover, the upper and lower casings with weak connection wall plates are connected by half-flanges, which facilitates precise manufacturing, quick installation, maintenance and impeller disassembly.
[0017] Enhanced casing structural strength: Insertion reinforcement columns with plug-in structure are arranged on the upper and lower sides of the half flange, which facilitates the alignment and connection of the upper and lower casings. The casing can reduce vibration value by more than 30% through reinforcement design, prevent cracking, and has a wide range of applications.
[0018] Improved sealing performance: The improved structure can reduce the overall housing leakage rate to 1 / 5 of that of the traditional structure.
[0019] Improved support strength; improved half flange support, capable of withstanding larger torques generated during bearing operation, significantly improving reliability and service life. Attached Figure Description
[0020] The following figures are illustrative and should not be construed as limiting the scope of this invention. Referring to the figures helps the reader understand the embodiments of this invention and further appreciate its advantages and technical features.
[0021] Figure 1 This is a schematic diagram of a three-dimensional structure of a conventional wind turbine half-shell.
[0022] Figure 2 This is a schematic diagram of the main structure of Example 1.
[0023] Figure 3 This is a breakdown diagram of the insertion reinforcement column and its insertion structure in Example 1.
[0024] The reference numerals in the figures include:
[0025] Mounting hole 1, weak connection dividing line 2, base 3, flange plate 4, plug-in reinforcing column 5, reinforcing rib 6, upper worm plate 7, upper side plate 8, lower worm plate 9, lower side plate 10; upper column 51, middle plug-in column 52, lower column 53. Detailed Implementation
[0026] It should be noted that:
[0027] In the description of this utility model, unless otherwise expressly specified and limited, the terms "comprising" and "having," and any variations thereof, are intended to cover other possible options under the same logic not listed. For example, a process, method, system, product, or device comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or device. The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the utility model product is in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model. Furthermore, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. Furthermore, terms such as "horizontal," "vertical," and "suspended" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. The terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components.
[0028] Unless otherwise specified, 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 invention pertains. In case of any conflict, the definitions in this specification shall prevail.
[0029] Centrifugal fan casings must withstand wind pressure and dynamic loads during operation. The mating surface between the bearing housing cover and the casing is a common source of oil leakage. The mating surfaces of the fan casing must fit tightly to prevent lubricant leakage. Poor sealing of the mating surface is a major cause of bearing housing oil leakage and requires regular inspection.
[0030] In this invention, the fan casing side plates are plate-like structures installed on both sides of the casing, typically made of welded or cast steel plates. The fan casing side plates and the volute together form a sealed space to prevent gas leakage. In types such as Roots blowers, the side plates, also called wall plates, directly support the rotor bearings, fix the bearings, and bear the radial force during rotor rotation, ensuring stable rotor operation while preventing gas leakage. The split side plate design simplifies the impeller maintenance process. Some large centrifugal fans use a split side plate design for easy maintenance, such as a three-section casing structure.
[0031] A half shell is a special mechanical structure design that refers to a structure in which a complete housing is divided into two or more halves along the axial or radial direction. It has wide applications in industrial equipment, and its main characteristics include:
[0032] Split-type structure: The housing is designed as two or more separable parts, which are fixed together to form a complete housing by connecting parts such as flanges, bolts or clamps.
[0033] Modular design: Facilitates equipment installation, maintenance and repair, and is especially suitable for large or complex machinery.
[0034] Structural reinforcement: High-strength connection is achieved through special connections such as half flanges, which can withstand large working torque.
[0035] Typical applications include power tools, centrifugal fans, and marine equipment. In power tools, the half-house can accommodate core components such as the motor and control switches, and the reciprocating oscillation of the tool head is achieved through an eccentric shaft structure. In the fan industry, the half-house structure facilitates rotor installation and maintenance, while the overall strength is improved through reinforced design.
[0036] Modern half-frame technology has developed a variety of innovative designs:
[0037] Strengthening structural design: For example, the C-shaped reinforcing ribs used in high-pressure centrifugal fans are distributed radially on the volute shell, with both ends welded to the reinforcing channel steel of the front and rear side plates, which significantly improves the shell strength.
[0038] Multi-compartment design: The latest chassis products adopt a multi-compartment structure, which can directly and specifically dissipate heat from heat-generating components (such as graphics cards), thereby improving overall heat dissipation efficiency.
[0039] Intelligent integration: High-end products integrate digital intelligent dynamic displays that can display system data in real time and support personalized customization.
[0040] The principle of this utility model is as follows:
[0041] 1) The casing adopts integral blanking of the side plate and worm plate, and the half surface of the side plate and worm plate adopts micro-connection blanking. After the casing is welded as a whole, the half surface of the casing is plasma cut for convenience and speed, and the welding efficiency is greatly improved compared with ordinary half structure.
[0042] 2) In addition to the ordinary half flange, the upper and lower housings are connected by a pin structure, which makes the connection between the upper and lower housings more secure and stronger, and reduces the risk of vibration caused by the half flange.
[0043] 3) This structure has a stronger casing, and the side plates and volutes of the casing can be appropriately thinned to reduce the overall weight of the fan and reduce manufacturing and transportation costs.
[0044] Among them, weak connections employ splicing size control in the construction of connecting parts, including aluminum alloy rivets and self-tapping screws, suitable for non-load-bearing connections between plates and fittings. This includes rivets that achieve connection by clamping two layers of steel plates; open-hole types are used for interior decoration, and closed-hole types are used for exterior projects. Alternatively, a cutting allowance of 4.0–5.0 mm is allowed for gas cutting or plasma cutting, and another 4.0–5.0 mm is allowed during milling of the end face. The longitudinal shrinkage value of the weld is calculated as 0.15–0.3 mm / m.
[0045] This utility model includes: a flange plate 4, a plug-in reinforcing column 5, an upper worm gear plate 7, an upper side plate 8, a lower worm gear plate 9, and a lower side plate 10; the housing adopts a two-part worm gear structure with an upper housing and a lower housing. The upper housing is fixedly connected by the upper worm gear plate 7 and the upper side plate 8, and the lower housing is fixedly connected by the lower worm gear plate 9 and the lower side plate 10. The upper and lower housings have weakly aligned connecting edges between the mating worm gear plates or side plates; a flange plate 4 is provided between the mating edges of the upper and lower housings; a plug-in reinforcing column 5 is provided between the upper and lower sides of the flange plate 4, and the upper and lower sections of the plug-in reinforcing column 5 are respectively fixed to the upper housing and the lower housing.
[0046] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0047] Example 1: As shown in the attached document Figure 2 As shown, a mounting hole 1 is provided laterally in the middle of the housing between the upper and lower housings. A base 3 is provided at the bottom of the housing, i.e., the bottom of the lower housing. Reinforcing ribs 6 are provided on the upper and lower sides of the flange plate 4, i.e., between the upper and lower housings. In particular, the reinforcing ribs 6 are fixed to the outer walls of the upper and lower housings. In particular, the reinforcing ribs 6 fixed to the outer walls of the upper and lower housings form a closed annular structure when joined together.
[0048] In this embodiment, as shown in the appendix Figure 3 As shown, the reinforcing posts 5 on the upper and lower housings are welded and positioned using reinforced square tubes; that is, the reinforcing posts 5 have a square tube structure. The reinforcing posts 5 include an upper post 51, a middle post 52, and a lower post 53; wherein the two ends of the reinforcing posts 5 are respectively inserted into the lower port of the upper post 51 and the upper port of the lower post 53.
[0049] Preferably, the upper column 51 and lower column 53 of the reinforcing column 5 are made of 80mm*60mm*4mm square tubing, and the middle insert column 52 is made of 70mm*50mm*5mm square tubing with a length of 180mm; the upper end of the middle insert column 52 is embedded 100mm into the square tubing opening of the upper column 51; the lower end of the middle insert column 52 protrudes 80mm. Six to eight Ф8mm plug welding holes are opened around the outer wall of the lower port of the upper column 51 or the upper port of the lower column 53. After the middle insert column 52 is inserted and plugged, it is ground flat. When it is necessary to weld the upper and lower housings together, laser welding can be performed at the joint.
[0050] The implementation principle of this embodiment is as follows:
[0051] 1) The upper worm plate 7 and lower worm plate 9, as well as the upper side plate 8 and lower side plate 10, are cut as a whole. Micro-connection structures are then fabricated between the upper and lower shells, specifically at the joints of the upper worm plate 7 and lower worm plate 9, and the upper side plate 8 and lower side plate 10. This includes either linearly continuous, spaced holes along the weak connection dividing line 2, or using rivets to clamp the two steel plates, or gas cutting or plasma cutting with a 4.0–5.0 mm allowance, or milling the end faces with a 4.0–5.0 mm allowance. After the overall casing is welded, the upper and lower casing hinge surfaces are easily and quickly separated using plasma cutting along the weak connection dividing line 2. Simultaneously, the flange plate 4, the inserted reinforcing column 5, and the reinforcing rib 6 are welded and fixed, along with the welding and installation of other casing accessories. The welding efficiency is significantly improved compared to ordinary hinge structures.
[0052] 2) The upper and lower housings are connected by inserting reinforcing columns 5 to align the flange plate 4 and reinforcing ribs 6, and then they are connected and fixed by welding.
[0053] Based on the embodiments of this utility model described above, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this utility model.
Claims
1. A deformable, reinforced, vibration-damping, optimized fan housing, comprising a flange plate (4), a plug-in reinforcing column (5), an upper volute (7), an upper side plate (8), a lower volute (9), and a lower side plate (10); characterized in that, The housing adopts a two-part volute structure with an upper housing and a lower housing. The upper housing is fixedly connected by an upper volute plate (7) and an upper side plate (8), and the lower housing is fixedly connected by a lower volute plate (9) and a lower side plate (10). A weak connection dividing line (2) is set between the upper housing and the lower housing and the volute plate or the side plate. A flange plate (4) is set between the mating edges of the upper and lower housings. An insert reinforcing column (5) is set between the upper and lower sides of the flange plate (4). The upper and lower sections of the insert reinforcing column (5) are fixed to the upper housing and the lower housing, respectively.
2. The anti-deformation structure reinforced and vibration-damping optimized fan housing according to claim 1, characterized in that, A mounting hole (1) is provided laterally in the middle of the housing between the upper and lower housings.
3. The anti-deformation structure reinforced and vibration-damping optimized fan housing according to claim 1, characterized in that, A base (3) is provided at the bottom of the shell, i.e., the bottom of the lower shell.
4. The anti-deformation structure reinforced and vibration-damping optimized fan housing according to claim 1, characterized in that, The insertion reinforcing post (5) includes an upper post (51), a middle insertion post (52), and a lower post (53); wherein the two ends of the insertion reinforcing post (5) are respectively inserted into the lower port of the upper post (51) and the upper port of the lower post (53).
5. The anti-deformation structure reinforced and vibration-damping optimized fan housing according to claim 1, characterized in that, The reinforcing column (5) adopts a square tube butt welding structure.
6. The anti-deformation structure reinforced and vibration-damping optimized fan housing according to claim 1, characterized in that, The weak connection dividing line (2) is a linear continuous interval opening.
7. The anti-deformation structure reinforced and vibration-damping optimized fan housing according to claim 1, characterized in that, The weak connection dividing line (2) is a groove with a margin of 4.0 to 5.0 mm that needs to be reserved for gas cutting or plasma cutting.
8. The anti-deformation structure reinforced and vibration-damping optimized fan housing according to claim 1, characterized in that, The weak connection dividing line (2) is a groove of 4.0 to 5.0 mm left when milling the end face.
9. The anti-deformation structure reinforced and vibration-damping optimized fan housing according to claim 1, characterized in that, Reinforcing ribs are fixed on the outer walls of the upper and lower shells (6).
10. The anti-deformation structure reinforced and vibration-damping optimized fan housing according to claim 9, characterized in that, The reinforcing ribs (6) fixed on the outer walls of the upper and lower shells form a closed ring structure.