An oil leakage prevention sealing structure of a bearing box of an axial flow fan
Patent Information
- Application Number
- CN202522403321.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-12
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-11-12
AI Technical Summary
然而，在轴流风机长期高速运行过程中，轴承箱密封失效导致的润滑油泄漏问题频发，已成为行业普遍痛点，当前轴流风机轴承箱主流密封方式存在显著缺陷：其一，单一唇形密封圈密封虽结构简单，但在高速旋转工况下，密封圈唇口易因摩擦发热老化，密封唇与主轴配合面磨损加剧，需频繁更换密封圈，维护成本高；其二，迷宫密封虽无接触磨损，但密封间隙易因主轴振动扩大，且无法阻挡灰尘、水汽等杂质进入轴承箱，导致润滑油污染变质，间接引发密封失效，针对上述问题，提出一种轴流风机轴承箱防漏油密封结构用于解决上述问题
[0010]本实用新型通过设置在轴承件两侧外壁的密封环，以及密封环的内侧与轴承件的外壁保持搭接，密封环的外侧与卡环的外壁保持搭接，有效解决了轴流风机轴承箱在长期高速运行过程中出现的润滑油泄漏问题，提高了设备的运行稳定性和使用寿命，同时降低了维护成本。
Smart Images
Figure CN224885896U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil leakage prevention and sealing technology, specifically to an oil leakage prevention and sealing structure for an axial flow fan bearing housing. Background Technology
[0002] Axial flow fans, as widely used fluid conveying equipment, rely heavily on their bearing housings, which are core components supporting the fan's main shaft and ensuring the stable operation of the transmission system. The lubricating oil filling the bearing housing needs to be maintained at a certain level to achieve bearing lubrication, cooling, and vibration damping. However, during long-term high-speed operation of axial flow fans, lubricating oil leakage caused by bearing housing seal failure is a frequent problem and a common pain point in the industry. Current mainstream sealing methods for axial flow fan bearing housings have significant drawbacks: First, while single lip seals are simple in structure, under high-speed rotation, the lip of the seal is prone to aging due to frictional heat, leading to increased wear on the mating surface between the lip and the main shaft, requiring frequent seal replacement and resulting in high maintenance costs. Second, although labyrinth seals eliminate contact wear, the sealing gap is easily widened by main shaft vibration and cannot prevent dust, moisture, and other impurities from entering the bearing housing, causing lubricating oil contamination and deterioration, indirectly leading to seal failure. To address these issues, a leak-proof sealing structure for axial flow fan bearing housings is proposed. Utility Model Content
[0003] To solve the above technical problems, the present invention adopts the following technical solution: an oil-leakage sealing structure for an axial flow fan bearing housing, comprising a mounting ring, a connecting frame detachably connected to the outer wall of the mounting ring, retaining rings symmetrically mounted at both ends of the mounting ring, and a bearing component located in the middle of the connecting frame, with sealing rings respectively provided on the outer walls of both sides of the bearing component, the inner side of the sealing ring overlapping with the outer wall of the bearing component, and the outer side of the sealing ring overlapping with the outer wall of the retaining ring.
[0004] Preferably, the mounting ring includes two symmetrically arranged circular rings, and the two circular rings are connected and fixed by a connecting bracket. A through groove is opened in the middle of the circular ring, and multiple mounting holes are opened in a ring shape at equal intervals on the inner wall of the through groove.
[0005] Preferably, the outer wall of the retaining ring is provided with multiple posts at equal intervals in a ring shape, and the sealing ring is provided with multiple positioning holes at equal intervals in a ring shape, and the posts pass through the positioning holes and are inserted into the mounting holes.
[0006] Preferably, a contact ring is fixedly installed on one side of the sealing ring, and the outer wall of the contact ring overlaps with the contact position of the inner and outer rings of the bearing component.
[0007] Preferably, the inner side of the contact ring is in elastic contact with the outer wall of the retaining ring, and the outer side of the contact ring is in elastic contact with the outer wall of the mounting ring.
[0008] Preferably, the outer end of the column extends through the mounting ring to the outside, and a clearance groove is provided on the outer wall of the mounting ring, and the column is fixedly connected to the mounting ring by a nut.
[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0010] This invention effectively solves the problem of lubricating oil leakage in axial flow fan bearing housings during long-term high-speed operation by using sealing rings on both sides of the bearing component, with the inner side of the sealing ring overlapping with the outer wall of the bearing component and the outer side of the sealing ring overlapping with the outer wall of the retaining ring. This improves the operational stability and service life of the equipment while reducing maintenance costs. Attached Figure Description
[0011] 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.
[0012] Figure 1 This is a schematic diagram of the overall sealing structure of this utility model;
[0013] Figure 2 This is an exploded view of the overall sealing structure of this utility model;
[0014] Figure 3 This is a schematic cross-sectional view of the sealing structure of this utility model;
[0015] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle.
[0016] In the diagram: 1. Mounting ring; 11. Connecting bracket; 12. Circular ring; 13. Through groove; 14. Mounting hole; 15. Clearance groove; 2. Snap ring; 21. Column; 3. Sealing ring; 31. Positioning hole; 32. Contact ring; 4. Bearing component. Detailed Implementation
[0017] 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 protection scope of the present utility model.
[0018] Example: Figures 1-4As shown, this utility model provides an oil-leakage-proof sealing structure for an axial flow fan bearing housing, including a mounting ring 1. A connecting frame 11 is detachably connected to the outer wall of the mounting ring 1. Clamping rings 2 are symmetrically mounted at both ends of the mounting ring 1. A bearing component 4 is located in the middle of the connecting frame 11. Sealing rings 3 are respectively provided on the outer walls of both sides of the bearing component 4. The inner side of the sealing ring 3 overlaps with the outer wall of the bearing component 4, and the outer side of the sealing ring 3 overlaps with the outer wall of the clamping ring 2. Specifically, in this application, the mounting ring 1 is formed by two symmetrically arranged circular rings 12 connected and fixed by the connecting frame 11. A through groove 13 is opened in the middle of the circular ring 12. Multiple mounting holes 14 are equally spaced in a ring on the inner wall of the through groove 13. This design facilitates the installation and fixing of other components while ensuring the stability of the structure.
[0019] Furthermore, in this application, the mounting ring 1 includes two symmetrically arranged circular rings 12, which are connected and fixed by a connecting bracket 11. A through groove 13 is formed in the middle of each circular ring 12, and multiple mounting holes 14 are equally spaced in a ring on the inner wall of the through groove 13. Multiple posts 21 are equally spaced in a ring on the outer wall of the retaining ring 2, and multiple positioning holes 31 are equally spaced in a ring on the sealing ring 3. The posts 21 pass through the positioning holes 31 and are inserted into the mounting holes 14.
[0020] The above technical solution not only ensures a stable connection between the sealing ring 3, the retaining ring 2, and the mounting ring 1, but also makes the entire sealing structure more convenient to assemble and disassemble, greatly improving maintenance efficiency. A contact ring 32 is fixedly installed on one side of the sealing ring 3. The outer wall of the contact ring 32 overlaps with the inner and outer rings of the bearing component 4. This design effectively enhances the sealing performance and prevents lubricating oil leakage from the gap between the bearing component 4 and the sealing ring 3. Simultaneously, the inner side of the contact ring 32 elastically contacts the outer wall of the retaining ring 2, and the outer side elastically contacts the outer wall of the mounting ring 1. This elastic contact method ensures both tightness of the seal and, to a certain extent, absorbs vibration, reducing the risk of seal failure due to vibration.
[0021] Specifically, in actual use, multiple posts 21 are arranged in a ring at equal intervals on the outer wall of the retaining ring 2, and multiple positioning holes 31 are arranged in a ring at equal intervals on the sealing ring 3. The posts 21 pass through the positioning holes 31 and are inserted into the mounting holes 14. This insertion method not only facilitates assembly and disassembly, but also effectively ensures the relative positional accuracy between the sealing ring 3 and the retaining ring 2, thereby ensuring the sealing effect. A contact ring 32 is fixedly installed on one side of the sealing ring 3. The outer wall of the contact ring 32 overlaps with the contact positions of the inner and outer rings of the bearing component 4. This design can further prevent lubricating oil from leaking from the gap between the bearing component 4 and the sealing ring 3. The outer end of the post 21 extends to the outside through the mounting ring 1, and a clearance groove 15 is also provided on the outer wall of the mounting ring 1. The post 21 is fixedly connected to the mounting ring 1 by a nut. This structural arrangement ensures the stability of the post 21 and facilitates the disassembly and adjustment of the sealing structure when needed.
[0022] Furthermore, a contact ring 32 is fixedly installed on one side of the sealing ring 3. The outer wall of the contact ring 32 overlaps with the contact positions of the inner and outer rings of the bearing component 4. The inner side of the contact ring 32 elastically contacts the outer wall of the retaining ring 2, and the outer side of the contact ring 32 elastically contacts the outer wall of the mounting ring 1. This elastic contact method can compensate for gaps caused by component wear or vibration to a certain extent, thereby maintaining a long-term sealing effect.
[0023] In one embodiment, in this application, the outer end of the column 21 extends through the mounting ring 1 to the outside, and a clearance groove 15 is provided on the outer wall of the mounting ring 1. The column 21 is fixedly connected to the mounting ring 1 by a nut. This design ensures the stability of the column 21 and facilitates subsequent maintenance and replacement. It also ensures a stable connection between the sealing ring 3 and the mounting ring 1.
[0024] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.
Claims
1. A leak-proof sealing structure for an axial flow fan bearing housing, characterized in that, include: Mounting ring (1), with a connecting frame (11) detachably connected to the outer wall of the mounting ring (1), retaining rings (2) symmetrically mounted at both ends of the mounting ring (1), and a bearing component (4) located in the middle of the connecting frame (11), with sealing rings (3) respectively provided on the outer walls of both sides of the bearing component (4), the inner side of the sealing ring (3) overlapping with the outer wall of the bearing component (4), and the outer side of the sealing ring (3) overlapping with the outer wall of the retaining ring (2).
2. The oil-leakage-proof sealing structure for an axial flow fan bearing housing as described in claim 1, characterized in that, The mounting ring (1) includes two symmetrically arranged circular ring parts (12), and the two circular ring parts (12) are connected and fixed by a connecting frame (11). A through groove (13) is provided in the middle of the circular ring part (12), and multiple mounting holes (14) are provided in a ring shape at equal intervals on the inner wall of the through groove (13).
3. The oil-leakage-proof sealing structure for an axial flow fan bearing housing as described in claim 2, characterized in that, The outer wall of the retaining ring (2) is provided with multiple columns (21) arranged in a ring at equal intervals, and the sealing ring (3) is provided with multiple positioning holes (31) arranged in a ring at equal intervals. The columns (21) pass through the positioning holes (31) and are inserted into the mounting holes (14).
4. The oil-leakage-proof sealing structure for an axial flow fan bearing housing as described in claim 3, characterized in that, A contact ring (32) is fixedly installed on one side of the sealing ring (3), and the outer wall of the contact ring (32) overlaps with the inner and outer rings of the bearing component (4).
5. The oil-leakage-proof sealing structure for an axial flow fan bearing housing as described in claim 4, characterized in that, The inner side of the contact ring (32) is in elastic contact with the outer wall of the retaining ring (2), and the outer side of the contact ring (32) is in elastic contact with the outer wall of the mounting ring (1).
6. The oil-leakage-proof sealing structure for an axial flow fan bearing housing as described in claim 5, characterized in that, The outer end of the column (21) extends through the mounting ring (1) to the outside, and a clearance groove (15) is provided on the outer wall of the mounting ring (1). The column (21) is fixedly connected to the mounting ring (1) by a nut.