A shaft seal ring with good sealing performance
By using a U-shaped seal and a shaft seal ring design with carefully selected materials, the shortcomings of traditional shaft seals in terms of media leakage and contaminant isolation are solved, achieving high-efficiency sealing performance and stability under high-speed and high-temperature conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YUEJI (GUANGZHOU) ELECTROMECHANICAL EQUIP CO LTD
- Filing Date
- 2025-08-18
- Publication Date
- 2026-06-05
AI Technical Summary
Traditional shaft seal designs struggle to simultaneously prevent media leakage and isolate external contaminants, and their reliability and durability are insufficient under high-speed and high-temperature conditions.
The U-shaped seal design forms a double-lip seal, with the inner lip main seal on the side closer to the shaft and the outer lip secondary seal on the side farther from the shaft. The combination of thin and thick end materials reduces contact stiffness and provides structural support, making it suitable for bidirectional pressure conditions and automatically compensating for thermal expansion and installation errors.
It effectively prevents media leakage and external contaminant entry under bidirectional pressure conditions, improves sealing performance, reduces high-speed friction and wear, and enhances pressure resistance and structural stability.
Smart Images
Figure CN224326688U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of shaft sealing ring technology, and in particular to a shaft sealing ring with good sealing performance. Background Technology
[0002] Shaft seal rings are key components used in rotating machinery to seal the gap between the shaft and the housing. They are widely used in equipment such as turbochargers, centrifugal pumps, and compressors. Their core function is to prevent leakage of working media (such as lubricating oil and gas) and to block external contaminants from entering the system. As industrial equipment develops towards higher speeds and higher temperatures, higher requirements are placed on the reliability, durability, and environmental adaptability of shaft seal rings, prompting the continuous emergence of new sealing materials and structures.
[0003] Traditional shaft seal designs typically employ single-lip rubber sealing rings or mechanical seal structures. However, these designs often struggle to simultaneously achieve the dual functions of preventing media leakage and isolating external contaminants. In light of this, this application proposes a shaft seal ring with superior sealing performance based on the aforementioned technical issues. Utility Model Content
[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a shaft sealing ring with good sealing performance.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A shaft seal ring with good sealing performance includes a cover plate, a pressure plate on one side of the cover plate, a housing between the cover plate and the pressure plate, two bearings inside the housing, each bearing including an inner ring and an outer ring, a support ring between the outer rings, and a shaft rotatably mounted between the inner rings. A ring-shaped seal is provided inside the pressure plate, the seal having a U-shaped vertical cross-section, and the seal abutting against the outside of the shaft.
[0007] Furthermore, the seal is configured with a thin end on the side closer to the shaft and a thick end on the side farther from the shaft.
[0008] Furthermore, the inner diameter of the support ring is larger than the outer diameter of the inner ring, and the outer diameter of the support ring matches the inner diameter of the bearing outer ring, so that the support ring only supports the bearing outer ring without interfering with the rotation of the inner ring.
[0009] Furthermore, a first abutting ring is provided on the lower surface of the cover plate, and a bearing located above it is disposed between the first abutting ring and the support ring. A second abutting ring is provided on the upper surface of the pressure plate, and a bearing located below it is disposed between the second abutting ring and the support ring.
[0010] Furthermore, the thin-end material is polyetheretherketone (PEEK), and the thick-end material is fluororubber.
[0011] Furthermore, both the cover plate and the pressure plate are provided with fixing screws, and the cover plate and the pressure plate are fixedly connected to the housing by fixing screws.
[0012] Furthermore, an opening is provided on one side of the pressure plate, and one end of the shaft passes through the opening.
[0013] The beneficial effects of this utility model are as follows:
[0014] 1. This utility model, by setting a sealing element, forms a double-lip seal due to the U-shaped structure of the sealing element. The side closer to the shaft is the inner lip main seal, which prevents the medium from leaking out, and the side farther from the shaft is the outer lip secondary seal, which prevents external contaminants from entering the housing. It is suitable for bidirectional pressure conditions. In addition, the U-shaped sealing element can automatically compensate for the thermal expansion or installation error of the shaft, and the sealing element can store lubricating medium inside. When the shaft rotates, it forms a pumping effect, and the rotation of the shaft drives the lubricating oil to be transported from the bottom of the sealing element to the outside. Moreover, the U-shaped sealing element has a stronger resistance to pressure deformation than traditional V-shaped or flat gaskets.
[0015] 2. By setting a thin end and a thick end, the thin end can reduce the contact stiffness between the thin end and the shaft, reduce shaft friction, and allow slight elastic deformation to avoid wear at high speeds, while the thick end provides structural support to prevent the overall instability of the seal. Attached Figure Description
[0016] Figure 1 This is a cross-sectional schematic diagram of a shaft sealing ring with good sealing performance proposed in this utility model;
[0017] Figure 2 This is a schematic diagram of an overall shaft seal ring with good sealing performance proposed in this utility model;
[0018] Figure 3 This is a cross-sectional schematic diagram of the support ring for a shaft seal ring with good sealing performance proposed in this utility model;
[0019] Figure 4 This is a cross-sectional schematic diagram of a sealing element for a shaft sealing ring with good sealing performance proposed in this utility model;
[0020] Figure 5 This is a schematic diagram showing the connection between the shaft body and the sealing element of a shaft sealing ring with good sealing performance proposed in this utility model.
[0021] Figure 6 This is a schematic diagram of a cover plate for a shaft sealing ring with good sealing performance proposed in this utility model;
[0022] Figure 7 This is a schematic diagram of the pressure plate of a shaft sealing ring with good sealing performance proposed in this utility model.
[0023] In the diagram: 1. Cover plate; 2. Pressure plate; 3. Housing; 4. Bearing; 5. Inner ring; 6. Outer ring; 7. Support ring; 8. Shaft; 9. Seal; 10. Thin end; 11. Second abutment ring; 12. Fixing screw; 13. Thick end; 14. First abutment ring. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0025] Reference Figure 1-4 A shaft seal ring with good sealing performance includes a cover plate 1, a pressure plate 2 is provided on one side of the cover plate 1, a housing 3 is provided between the cover plate 1 and the pressure plate 2, two bearings 4 are provided inside the housing 3, the bearings 4 include an inner ring 5 and an outer ring 6, a support ring 7 is provided between the outer rings 6, a shaft 8 is rotatably mounted between the inner rings 5, and a ring-shaped sealing element 9 is provided inside the pressure plate 2. The sealing element 9 has a U-shaped vertical cross section and abuts against the outside of the shaft 8.
[0026] Because the U-shaped seal 9 forms a double lip seal, the side closer to the shaft 8 is the inner lip main seal, which prevents the medium from leaking out, and the side farther from the shaft 8 is the outer lip secondary seal, which prevents external contaminants from entering the housing 3. It is suitable for bidirectional pressure conditions.
[0027] In addition, the U-shaped seal 9 can automatically compensate for the thermal expansion or installation error of the shaft 8, and the seal 9 can store lubricating medium inside. When the shaft 8 rotates, it forms a pumping effect. The rotation of the shaft 8 drives the lubricating oil to be transported from the bottom of the seal 9 to the outside. Moreover, the U-shaped seal 9 has a stronger resistance to pressure deformation than traditional V-shaped or flat gaskets.
[0028] Reference Figure 4-5 Specifically: the side of the seal 9 closest to the shaft 8 is provided with a thin end 10, and the side of the seal 9 furthest from the shaft 8 is provided with a thick end 13. The thin end 10 can reduce the contact stiffness between the seal 9 and the shaft 8, reduce the friction of the shaft 8, and allow a small amount of elastic deformation to avoid wear at high speeds. The thick end 13 provides structural support to prevent the seal 9 from becoming unstable as a whole.
[0029] Reference Figure 1 , Figure 3 Specifically: the inner diameter of the support ring 7 is larger than the outer diameter of the inner ring 5, and the outer diameter of the support ring 7 matches the inner diameter of the outer ring 6 of the bearing 4, so that the support ring 7 only supports the outer ring 6 of the bearing 4 without interfering with the rotation of the inner ring 5.
[0030] Reference Figure 1 , Figure 6-7Specifically: the lower surface of the cover plate 1 is provided with a first abutting ring 14, and the upper bearing 4 is located between the first abutting ring 14 and the support ring 7; the upper surface of the pressure plate 2 is provided with a second abutting ring 11, and the lower bearing 4 is located between the second abutting ring 11 and the support ring 7.
[0031] During assembly, first place the seal 9 inside the pressure plate 2. The thin end 10 of the seal 9 extends outward relative to the opening of the pressure plate 2 for contact with the shaft 8. Then place the housing 3 on the pressure plate 2. The second abutment ring 11 facilitates the precise positioning of the housing 3 to prevent displacement. Then insert the first bearing 4 into the housing 3. Then pass the shaft 8 through the opening between the first bearing 4 and the pressure plate 2. Then place the support ring 7 on the outer ring 6 of the first bearing 4. Then connect the second bearing 4 to the other end of the shaft 8. Finally, connect the cover plate 1 to the housing 3. The first abutment ring 14 also facilitates the precise positioning of the cover plate 1. Finally, fix the cover plate 1, housing 3, and pressure plate 2 with the fixing screws 12. The assembly is complete.
[0032] Reference Figure 4 Specifically: the thin end 10 is made of polyetheretherketone, which has a low coefficient of friction and strong wear resistance; the thick end 13 is made of fluororubber, which provides elastic support.
[0033] Reference Figure 1 Specifically: both the cover plate 1 and the pressure plate 2 are provided with fixing screws 12, and the cover plate 1 and the pressure plate 2 are fixedly connected to the housing 3 by the fixing screws 12.
[0034] Reference Figure 7 Specifically: an opening is provided on one side of the pressure plate 2, and one end of the shaft 8 passes through the opening.
[0035] Working principle: During assembly, first place the seal 9 inside the pressure plate 2. The thin end 10 of the seal 9 extends outward relative to the opening of the pressure plate 2 for contact with the shaft 8. Then place the housing 3 on the pressure plate 2. The second abutment ring 11 facilitates the precise positioning of the housing 3 to prevent displacement. Then insert the first bearing 4 into the housing 3. Then pass the shaft 8 through the opening between the first bearing 4 and the pressure plate 2. Then place the support ring 7 on the outer ring 6 of the first bearing 4. Then connect the second bearing 4 to the other end of the shaft 8. Finally, connect the cover plate 1 to the housing 3. The first abutment ring 14 also facilitates the precise positioning of the cover plate 1. Finally, fix the cover plate 1, housing 3, and pressure plate 2 with fixing screws 12. Assembly is complete.
[0036] Because the U-shaped seal 9 forms a double lip seal, the side closer to the shaft 8 is the inner lip main seal, which prevents the medium from leaking out, and the side farther from the shaft 8 is the outer lip secondary seal, which prevents external contaminants from entering the housing 3. It is suitable for bidirectional pressure conditions.
[0037] In addition, the U-shaped seal 9 can automatically compensate for the thermal expansion or installation error of the shaft 8, and the seal 9 can store lubricating medium inside. When the shaft 8 rotates, it forms a pumping effect. The rotation of the shaft 8 drives the lubricating oil to be transported from the bottom of the seal 9 to the outside. Moreover, the U-shaped seal 9 has a stronger resistance to pressure deformation than traditional V-shaped or flat gaskets.
[0038] The thin end 10 can reduce the contact stiffness with the shaft 8, reduce the friction of the shaft 8, and allow a small amount of elastic deformation to avoid wear at high speeds, while the thick end 13 provides structural support to prevent the seal 9 from becoming unstable as a whole.
[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
[0040] In the description of this patent, it should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent 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. Therefore, they should not be construed as limitations on this patent.
Claims
1. A shaft seal ring with good sealing performance, characterized in that, Includes a cover plate (1), a pressure plate (2) is provided on one side of the cover plate (1), a housing (3) is provided between the cover plate (1) and the pressure plate (2), two bearings (4) are provided inside the housing (3), the bearings (4) include an inner ring (5) and an outer ring (6), a support ring (7) is provided between the outer rings (6), a shaft (8) is rotatably installed between the inner rings (5), a ring-shaped seal (9) is provided inside the pressure plate (2), the seal (9) has a U-shaped vertical section, and the seal (9) abuts against the outside of the shaft (8).
2. The shaft seal ring with good sealing performance according to claim 1, characterized in that, The seal (9) is provided with a thin end (10) on the side closer to the shaft (8) and a thick end (13) on the side away from the shaft (8).
3. A shaft seal ring with good sealing performance according to claim 1, characterized in that, The inner diameter of the support ring (7) is larger than the outer diameter of the inner ring (5), and the outer diameter of the support ring (7) matches the inner diameter of the outer ring (6) of the bearing (4), so that the support ring (7) only supports the outer ring (6) of the bearing (4) without interfering with the rotation of the inner ring (5).
4. A shaft seal ring with good sealing performance according to claim 1, characterized in that, The cover plate (1) has a first abutting ring (14) on its lower surface, and the bearing (4) located above it is located between the first abutting ring (14) and the support ring (7). The pressure plate (2) has a second abutting ring (11) on its upper surface, and the bearing (4) located below it is located between the second abutting ring (11) and the support ring (7).
5. A shaft seal ring with good sealing performance according to claim 2, characterized in that, The thin end (10) is made of polyether ether ketone, and the thick end (13) is made of fluororubber.
6. A shaft seal ring with good sealing performance according to claim 1, characterized in that, Both the cover plate (1) and the pressure plate (2) are provided with fixing screws (12), and the cover plate (1) and the pressure plate (2) are fixedly connected to the housing (3) by fixing screws (12).
7. A shaft seal ring with good sealing performance according to claim 1, characterized in that, The pressure plate (2) has an opening on one side, and one end of the shaft (8) passes through the opening.