Wastewater biochemical primary sedimentation tank stirring bearing gland oil seal

Abstract

This utility model discloses an oil seal for the bearing cap of a wastewater biochemical primary sedimentation tank, relating to the field of oil seal technology. It includes a rotating shaft with a metal housing surrounding it. The metal housing is a hollow cavity structure with a through-hole. A dynamic sealing structure is provided between the metal housing and the rotating shaft. The dynamic sealing structure includes a rubber isolation layer on the inner ring of the metal housing and a fastening spring on the other end face. A protective mechanism is provided between the metal housing and the rotating shaft. The protective mechanism includes a fixed ridge protruding outward from the lower edge of the inner ring of the metal housing, with a shielding soft piece embedded in the fixed ridge. The shielding soft piece is annular in shape, with its edge abutting against the rotating shaft. An adjustment component for adjusting the tightness of the fastening spring is provided inside the metal housing. The protective mechanism, through the annular shielding soft piece embedded in the fixed ridge abutting against the rotating shaft, forms a physical barrier, preventing larger particles or fibrous impurities from entering the sealing area and reducing wear on the sealing area.

Description

Technical Field

[0001] This utility model relates to the field of oil seal technology. Background Technology

[0002] In wastewater treatment, the primary sedimentation tank is a crucial pretreatment unit. Its mixing equipment is responsible for uniformly mixing wastewater and sludge to prevent sedimentation. The bearings of the mixer, as core transmission components, directly determine the stability and lifespan of the equipment. However, the working environment of the primary sedimentation tank is extremely harsh. During mixing, the bearing seals are constantly immersed in wastewater with complex compositions. Wastewater contains a large amount of suspended solids, fibrous impurities, grease, and chemically corrosive substances. These contaminants easily damage the clearance between the rotating shaft and the seals.

[0003] Currently, such equipment generally uses traditional skeleton oil seals or packing seals. These sealing structures have significant shortcomings when facing the aforementioned complex operating conditions: First, the clamping force of the sealing lip or packing on the shaft is usually constant. After long-term wear, the preload gradually decreases, leading to gaps at the sealing interface and loss of sealing effectiveness. Second, existing sealing structures lack effective active protection mechanisms; fine particles and fibers can easily penetrate the sealing surface, accelerating the wear of the sealing lip and shaft surface, and may even cause the rotating shaft to become entangled or jammed, ultimately leading to complete seal failure.

[0004] Therefore, under continuous operation, impurity intrusion and premature wear of seals become the most common problems. This not only leads to lubricating grease leakage and water pollution, but more seriously, wastewater can enter the bearing housing, causing bearing corrosion and damage, and triggering equipment downtime. Frequent replacement of seals and repair of bearings not only significantly increases maintenance costs but also affects the continuity and stability of wastewater treatment processes. Existing sealing solutions are no longer sufficient to meet the requirements of modern wastewater treatment plants for long-term, high-reliability operation of equipment, and there is an urgent need for a new sealing structure that can actively adapt to wear and has efficient protective capabilities. Utility Model Content

[0005] The purpose of this utility model is to solve the above-mentioned technical problems by providing an oil seal for the bearing cap of a wastewater biochemical primary sedimentation tank.

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution: The wastewater biological primary sedimentation tank agitator bearing cap oil seal includes a rotating shaft. A metal shell is fitted around the outer periphery of the rotating shaft. The metal shell is a hollow cavity structure with a through-hole. A dynamic sealing structure is provided between the metal shell and the rotating shaft. The dynamic sealing structure includes a rubber isolation layer located on the inner ring of the metal shell. One end face of the rubber isolation layer away from the inner cavity of the metal shell is in contact with the rotating shaft, and a fastening spring is provided on the other end face. The fastening spring has a tendency to drive the rubber isolation layer to move towards one side of the rotating shaft. A protective mechanism is provided between the metal shell and the rotating shaft. The protective mechanism includes a fixing ridge protruding outward from the lower edge of the inner ring of the metal shell. A shielding soft piece is embedded in the fixing ridge. The shielding soft piece is generally annular and its edge abuts against the rotating shaft. An adjustment component is provided inside the metal shell to adjust the tightness of the fastening spring. The above-described solution enhances sealing reliability and service life under harsh operating conditions through multi-layered sealing and protection design. The metal housing serves as the main support, and its hollow internal cavity provides installation space for the dynamic sealing structure and protective mechanism. The dynamic sealing component uses a rubber isolation layer that adheres to the rotating shaft, with a retaining spring on the back. Continuous radial pressure is applied to keep the rubber layer tightly against the shaft surface, forming an active dynamic seal that effectively prevents grease leakage and sewage intrusion. Simultaneously, the protective mechanism uses a ring-shaped shielding plate embedded in a fixed ridge to abut against the rotating shaft, forming a physical barrier that prevents larger particles or fibrous impurities from entering the sealing area, reducing wear on the sealing area. The adjustable component allows the spring preload to be adjusted according to actual operating conditions, further optimizing the adaptability of the sealing pressure.

[0007] Furthermore, the adjustment assembly includes a clamping band disposed in the inner cavity of the metal housing, the clamping band being mounted on the upper end of the fastening spring, the clamping band having an elliptical cross-section, the clamping band being elastic, and tensioning components being provided at both ends of the clamping band. With the above scheme, the adjusting component is mounted on top of the fastening spring via an elastic clamping band. Its elliptical cross-section design ensures uniform pressure distribution and avoids localized stress concentration. The tensioning components at both ends of the clamping band allow external control of the pressure distribution on the spring, thereby indirectly adjusting the tightness of the fit between the rubber insulating layer and the shaft. This structure not only improves the uniformity of the sealing pressure adjustment but also reduces the direct mechanical load on the spring itself, extending its service life.

[0008] Furthermore, the tensioning assembly includes a bidirectional lead screw disposed on the side wall of the metal housing. The bidirectional lead screw has threads in opposite directions distributed from the center to both sides. Sliders are symmetrically disposed on the bidirectional lead screw, and the sliders are screwed to the bidirectional lead screw. A limiting groove is disposed on the metal housing along the bidirectional lead screw. One end of the slider is embedded in the limiting groove. Both ends of the clamping band are respectively connected to the two sliders. An adjusting wheel is disposed in the middle of the bidirectional lead screw, and the adjusting wheel extends out of the outer periphery of the metal housing. The above solution employs a bidirectional lead screw structure. Rotating the adjusting wheel drives symmetrically arranged sliders to move in opposite directions, thereby pulling the ends of the pressure band to achieve tension or relaxation. Limiting grooves ensure the linear accuracy of the slider movement, avoiding uneven pressure caused by skewing. This design achieves precise linear adjustment, is easy to operate, and has a stable structure, making it particularly suitable for industrial applications requiring frequent adjustments.

[0009] Furthermore, the side wall of the adjusting wheel is provided with a number of pin holes, and the metal housing is provided with fixing pins that are adapted to the pin holes. The above solution allows the lead screw to be locked in place once the adjustment is complete, preventing loosening due to equipment vibration or accidental contact. This improves the stability and safety of the adjustment state and reduces maintenance requirements.

[0010] Furthermore, the metal housing is provided with a protective cover at the adjusting wheel. By installing a protective cover on the outside of the adjusting wheel, external pollutants such as sewage and dust can be prevented from entering the lead screw transmission parts, reducing the risk of corrosion and blockage and ensuring the long-term reliability of the adjusting mechanism.

[0011] Furthermore, the fixed edge has a recessed embedding groove at its end, and the shielding film has an expansion strip on one side that is adapted to the embedding groove. By installing a protective cover on the outside of the adjusting wheel, external pollutants such as sewage and dust can be prevented from entering the lead screw transmission parts, reducing the risk of corrosion and blockage and ensuring the long-term reliability of the adjusting mechanism.

[0012] Furthermore, the shielding film is arranged in a dense strip pattern at one end close to the rotating shaft. By installing a protective cover on the outside of the adjusting wheel, external pollutants such as sewage and dust can be prevented from entering the lead screw transmission parts, reducing the risk of corrosion and blockage and ensuring the long-term reliability of the adjusting mechanism.

[0013] The beneficial effects of this utility model are as follows: 1. This utility model has a simple structure and improves sealing reliability and service life under harsh working conditions through multi-layer sealing and protection design. The metal shell serves as the main support, and its hollow internal cavity structure provides installation space for the dynamic sealing structure and protection mechanism. The dynamic sealing part uses a rubber isolation layer that fits against the rotating shaft, and a fastening spring is set on the back. Continuous radial pressure is applied to keep the rubber layer tightly against the shaft surface, forming an active dynamic seal, effectively preventing grease leakage and sewage intrusion. At the same time, the protection mechanism uses a ring-shaped shielding soft piece embedded in the fixed ridge to abut against the rotating shaft, forming a physical barrier to prevent larger particles or fibrous impurities from entering the sealing area, reducing wear on the sealing area. The setting of the adjustment component allows the spring preload to be adjusted according to actual working conditions, further optimizing the adaptability of the sealing pressure; 2. The tensioning assembly adopts a bidirectional lead screw structure. Rotating the adjusting wheel drives symmetrically arranged sliders to move in opposite directions, thereby pulling the two ends of the pressure band to achieve tensioning or relaxation. Limiting grooves ensure the linear accuracy of the slider movement, avoiding uneven pressure caused by skewing. This design achieves precise linear adjustment, is easy to operate, and has a stable structure, making it particularly suitable for industrial applications requiring frequent adjustments. Attached Figure Description

[0014] Figure 1 This is a partial cross-sectional structural schematic diagram of this utility model; Figure 2 This is a schematic diagram of the bidirectional lead screw structure of this application; Figure 3 This is a schematic diagram of the protective cover structure of this application.

[0015] Reference numerals: 11. Rotating shaft; 12. Metal housing; 13. Rubber isolation layer; 14. Fastening spring; 15. Fixing ridge; 16. Shielding soft sheet; 17. Pressure band; 18. Two-way lead screw; 19. Slider; 20. Limiting groove; 21. Adjusting wheel; 22. Pin hole; 23. Fixing pin; 24. Protective cover; 25. Embedded groove; 26. Expansion strip. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] Example 1 like Figures 1 to 3 As shown, this embodiment provides an oil seal for the bearing cap of a wastewater biochemical primary sedimentation tank, including a rotating shaft 11. A metal housing 12 is fitted around the outer periphery of the rotating shaft 11. The metal housing 12 is a hollow cavity structure with a through-hole. A dynamic sealing structure is provided between the metal housing 12 and the rotating shaft 11. The dynamic sealing structure includes a rubber isolation layer 13 located on the inner ring of the metal housing 12. One end face of the rubber isolation layer 13 away from the inner cavity of the metal housing 12 is in contact with the rotating shaft 11, and a fastening spring 14 is provided on the other end face. The fastening spring 14 has a tendency to drive the rubber isolation layer 13 to move towards one side of the rotating shaft 11. A protective mechanism is provided between the metal housing 12 and the rotating shaft 11. The protective mechanism includes a fixing ridge 15 protruding outward from the lower edge of the inner ring of the metal housing 12. A shielding soft piece 16 is embedded on the fixing ridge 15. The shielding soft piece 16 is generally annular and its edge abuts against the rotating shaft 11. An adjustment component for adjusting the tightness of the fastening spring 14 is provided inside the metal housing 12. Multi-layered sealing and protection design enhances sealing reliability and service life under harsh operating conditions. The metal housing 12 serves as the main support, and its hollow internal cavity provides installation space for the dynamic sealing structure and protective mechanism. The dynamic sealing component uses a rubber isolation layer 13 that adheres to the rotating shaft 11, with a retaining spring 14 on the back. Continuous radial pressure is applied to keep the rubber layer tightly against the shaft surface, forming an active dynamic seal that effectively prevents grease leakage and sewage intrusion. Simultaneously, the protective mechanism, through an annular shielding soft plate 16 embedded in the fixing ridge 15, abuts against the rotating shaft 11, forming a physical barrier to prevent larger particles or fibrous impurities from entering the sealing area, reducing wear on the sealing area. The adjustable component allows the spring preload to be adjusted according to actual operating conditions, further optimizing the adaptability of the sealing pressure.

[0019] Reference Figures 1 to 3To improve the ease of maintenance of the device, a recessed embedding groove 25 is provided at the end of the fixed edge 15, and an expansion strip 26 adapted to the embedding groove 25 is provided on one side of the shielding soft sheet 16. The end of the shielding soft sheet 16 close to the rotating shaft 11 is arranged in a dense strip pattern. A protective cover 24 is installed on the outside of the adjusting wheel 21 to prevent external contaminants such as sewage and dust from entering the lead screw transmission part, reducing the risk of corrosion and blockage, and ensuring the long-term reliability of the adjusting mechanism.

[0020] Reference Figures 1 to 3 The adjusting assembly includes a clamping band 17 located within the inner cavity of the metal housing 12. The clamping band 17 is mounted on the upper end of the fastening spring 14. The clamping band 17 has an elliptical cross-section and is elastic. Tensioning components are located at both ends of the clamping band 17. Each tensioning component includes a bidirectional lead screw 18 located on the side wall of the metal housing 12. The bidirectional lead screw 18 has threads in opposite directions distributed from the center to both sides. Slider blocks 19 are symmetrically arranged on the bidirectional lead screw 18 and are screwed onto it. A limiting groove 20 is provided along the bidirectional lead screw 18 on the metal housing 12. One end of each slider 19 is embedded in the limiting groove 20. Both ends of the clamping band 17 are connected to the two sliders 19 respectively. An adjusting wheel 21 is located in the middle of the bidirectional lead screw 18 and extends out of the outer periphery of the metal housing 12. The tensioning assembly uses a bidirectional lead screw 18 structure. By rotating the adjusting wheel 21, the symmetrically arranged sliders 19 are driven to move in opposite directions, thereby pulling the two ends of the clamping band 17 to achieve tensioning or loosening. The limiting groove 20 ensures the linear accuracy of the slider 19's movement, avoiding uneven pressure caused by skewing. This design achieves precise linear adjustment, is easy to operate, and has a stable structure, making it particularly suitable for industrial applications requiring frequent adjustments. The adjustment component is mounted on the upper end of the clamping spring 14 via the elastic clamping band 17, whose elliptical cross-section design can evenly transmit pressure and avoid local stress concentration. The tensioning components at both ends of the clamping band 17 allow external control of the pressure distribution of the clamping band 17 on the spring, thereby indirectly adjusting the tightness of the fit between the rubber insulating layer 13 and the shaft. This structure not only improves the uniformity of the sealing pressure adjustment but also reduces the direct mechanical load on the spring itself, extending the spring's service life.

[0021] Reference Figures 1 to 3To improve the durability and stability of the device, the side wall of the adjusting wheel 21 is provided with several pin holes 22, and the metal housing 12 is provided with fixing pins 23 that are adapted to the pin holes 22. Two sets of fixing pins 23 are provided on the upper and lower sides of the metal housing 12 to fix the adjusting wheel 21. A protective cover 24 is provided on the metal housing 12 at the adjusting wheel 21. The protective cover 24 installed on the outside of the adjusting wheel 21 prevents external contaminants such as sewage and dust from entering the lead screw drive part, reducing the risk of corrosion and blockage, and ensuring the long-term reliability of the adjustment mechanism. The pin holes 22 allow the lead screw position to be locked by inserting the fixing pins 23 after adjustment, preventing loosening due to equipment vibration or accidental contact, improving the stability and safety of the adjustment state, and reducing maintenance requirements.

[0022] Implementation Principle: This application discloses an oil seal for the bearing cap of a wastewater biochemical primary sedimentation tank, which improves sealing reliability and service life under harsh operating conditions through multi-layer sealing and protection design. The metal housing 12 serves as the main support, and its hollow internal cavity provides installation space for the dynamic sealing structure and protective mechanism. The dynamic sealing part uses a rubber isolation layer 13 that adheres to the rotating shaft 11, with a retaining spring 14 on the back. Continuous radial pressure is applied to keep the rubber layer tightly against the shaft surface, forming an active dynamic seal that effectively prevents grease leakage and sewage intrusion. Simultaneously, the protective mechanism uses an annular shielding soft plate 16 embedded in the fixing ridge 15 to abut against the rotating shaft 11, forming a physical barrier to prevent larger particles or fibrous impurities from entering the sealing area, reducing wear on the sealing area. The adjustable component allows the spring preload to be adjusted according to actual operating conditions, further optimizing the adaptability of the sealing pressure.

[0023] It should be noted that the connection relationships of components not specifically mentioned in this application are all assumed to be based on existing technology. Since they do not involve the inventive point and are commonly used in existing technology, the structural connection relationships are not described in detail.

Claims

1. A bearing cap oil seal for a wastewater biological primary sedimentation tank, comprising a rotating shaft (11), characterized in that, A metal housing (12) is fitted around the outer periphery of the rotating shaft (11). The metal housing (12) is a hollow cavity structure with a through-hole. A dynamic sealing structure is provided between the metal housing (12) and the rotating shaft (11). The dynamic sealing structure includes a rubber isolation layer (13) disposed on the inner ring of the metal housing (12). One end face of the rubber isolation layer (13) away from the inner cavity of the metal housing (12) is in contact with the rotating shaft (11), and the other end face is provided with a fastening spring (14). The fastening spring (14) has... The rubber isolation layer (13) is driven to move towards the rotating shaft (11). A protective mechanism is provided between the metal housing (12) and the rotating shaft (11). The protective mechanism includes a fixed ridge (15) that protrudes outward from the lower edge of the inner ring of the metal housing (12). A shielding soft piece (16) is embedded on the fixed ridge (15). The shielding soft piece (16) is generally annular and its edge abuts against the rotating shaft (11). An adjustment component for adjusting the tightness of the fastening spring (14) is provided inside the metal housing (12).

2. The wastewater biological primary settling tank stirring shaft bearing gland oil seal according to claim 1, characterized in that, The adjustment assembly includes a clamping band (17) disposed in the inner cavity of the metal housing (12). The clamping band (17) is mounted on the upper end of the fastening spring (14). The clamping band (17) has an elliptical cross section and is elastic. The clamping band (17) is provided with tensioning components at both ends.

3. The oil seal for the agitator bearing cap of the wastewater biochemical primary sedimentation tank according to claim 2, characterized in that, The tensioning assembly includes a bidirectional lead screw (18) disposed on the side wall of the metal housing (12). The bidirectional lead screw (18) has threads in opposite directions distributed from the center to both sides. Sliders (19) are symmetrically disposed on the bidirectional lead screw (18). The sliders (19) are screwed to the bidirectional lead screw (18). A limiting groove (20) is provided on the metal housing (12) along the bidirectional lead screw (18). One end of the slider (19) is embedded in the limiting groove (20). The two ends of the clamping band (17) are respectively connected to the two sliders (19). An adjusting wheel (21) is provided in the middle of the bidirectional lead screw (18). The adjusting wheel (21) extends out of the outer periphery of the metal housing (12).

4. The wastewater biological primary settling tank stirring shaft bearing gland oil seal according to claim 3, characterized in that, The sidewall of the adjusting wheel (21) is provided with a plurality of pin holes (22), and the metal housing (12) is provided with a fixing pin (23) that is adapted to the pin holes (22).

5. The wastewater biological primary clarifier agitator bearing gland oil seal of claim 4, wherein, The metal housing (12) is provided with a protective cover (24) at the adjusting wheel (21).

6. The wastewater biological primary clarifier agitator bearing gland oil seal of claim 1, wherein, The fixed ridge (15) has a recessed embedding groove (25) at its end, and the shielding film (16) has an expansion strip (26) on one side that is adapted to the embedding groove (25).

7. The wastewater biological primary settling tank stirring shaft bearing gland oil seal according to claim 6, characterized in that, The shielding film (16) is arranged in a dense strip pattern at one end close to the rotating shaft (11).

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