Combined oil retaining structure for dry gas seal
Patent Information
- Application Number
- CN202522184342.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-15
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-10-15
AI Technical Summary
由于隔离密封单元靠近轴承箱设置，目前，隔离密封单元处要么缺乏挡油设计，使得润滑油雾冷凝、润滑油飞溅或回油不畅引发的油液积聚情况下润滑油均容易进入干气密封，影响干气密封的长期正常使用，容易引发密封失效；要么在隔离密封单元外侧布置板式挡油组件，挡油组件与锁紧螺母7之间通常形成静止窄缝密闭空间，使得隔离气排放通道受阻，隔离气在隔离密封内部产生紊流，影响隔离密封的效果
在工作时，从轴承箱位置飘散出的油雾或飞溅出的润滑油会附着在隔离梳齿环靠近轴承箱一侧的端面上，润滑油雾冷凝后或喷溅的润滑油会沿着隔离梳齿环端面进入集油槽内实现收集，然后在重力自主引流作用下滴落在隔离梳齿环外，从而降低了润滑油进入隔离密封的可能性；而甩油环体外径大于隔离梳齿环环体的内径，避免了喷射的润滑油或飘散的润滑油雾直接进入梳齿内部，凸起的甩油环体破坏了油膜张力，阻止润滑油通过锁紧螺母表面爬行进入隔离密封，并且在旋转轴带动锁紧螺母与甩油环体旋转的过程中，在离心力作用下，甩油环体上附着的润滑油被甩出，从根本上阻断润滑油进入干气密封的通道，从而能有效阻挡润滑油侵入干气密封，降低密封被润滑油污染的风险，保障干气密封性能及设备长期稳定运行，同时不会影响干气密封处隔离气的排放，保证隔离密封效果。
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Abstract
Description
Technical Field
[0001] This application relates to the field of dry gas sealing technology, and in particular to a combined oil baffle structure for dry gas sealing. Background Technology
[0002] Rotating equipment such as compressors, high-speed pumps, and expanders are usually equipped with bearing housings and dry gas seals. The design of dry gas seals helps to prevent media leakage and ensure the sealing and safety of the equipment.
[0003] Combination Figure 1 In related technologies, the dry gas sealing device mainly includes an isolation sealing unit set on the side of the housing near the bearing. The isolation sealing unit includes an isolation comb ring 5 set on the inner side of the housing. The top of the comb teeth on the inner side of the isolation comb ring 5 is fitted with the outer cylindrical surface of the locking nut 7 fixedly sleeved on the rotating shaft 6 with a small clearance.
[0004] To ensure the cooling and lubrication of bearings in rotating equipment, lubricating oil or oil mist lubrication is usually used at the bearings. Since the isolation seal unit is located close to the bearing housing, currently, the isolation seal unit either lacks an oil-blocking design, allowing lubricating oil to easily enter the dry gas seal due to lubricating oil mist condensation, lubricating oil splashing, or oil accumulation caused by poor oil return, affecting the long-term normal use of the dry gas seal and easily leading to seal failure; or it uses a plate-type oil-blocking component on the outside of the isolation seal unit. This oil-blocking component and the locking nut 7 usually form a static, narrow, sealed space, obstructing the isolation gas discharge channel and causing turbulence of the isolation gas inside the isolation seal, affecting the effectiveness of the isolation seal. Utility Model Content
[0005] In order to effectively prevent lubricating oil from entering the dry gas seal, reduce the risk of seal contamination by lubricating oil, ensure the performance of the dry gas seal and the long-term stable operation of the equipment, and at the same time not affect the emission of the isolation gas at the dry gas seal to ensure the isolation and sealing effect, this application provides a combined oil-blocking structure for the dry gas seal.
[0006] This application provides a combined oil-blocking structure for dry gas seals, employing the following technical solution: A combined oil baffle structure for dry gas seals, comprising: An oil collecting ring is provided on an isolation comb ring, and an oil collecting groove is formed between the oil collecting ring and the isolation comb ring. An oil slinger ring is used to be installed on a locking nut. The oil slinger ring is located on the side of the isolation comb ring near the bearing housing. The outer diameter of the oil slinger ring is larger than the inner diameter of the isolation comb ring.
[0007] Preferably, the end face of the oil-slinging ring away from the isolation comb ring is a conical surface, and the diameter of the conical surface increases in the direction away from the isolation comb ring.
[0008] Preferably, the minimum diameter of the conical surface is smaller than the outer diameter of the locking nut.
[0009] Preferably, the distance between the end face of the oil-slinging ring near the isolation comb ring and the end face of the oil-collecting ring near the bearing housing is greater than the radial length of the comb teeth on the isolation comb ring.
[0010] Preferably, the minimum diameter of the end face of the oil-slinging ring near the isolation comb ring is smaller than the inner diameter of the isolation comb ring body.
[0011] Preferably, the diameter of the end face of the oil collecting ring near the bearing housing increases in the direction of approaching the bearing housing.
[0012] Preferably, the minimum diameter of the end face of the oil collecting ring near the bearing housing is equal to the inner diameter of the isolation comb ring.
[0013] Preferably, the diameter of the end face of the oil collecting ring away from the bearing housing increases in the direction closer to the bearing housing.
[0014] Preferably, the outer diameter of the oil collecting ring is larger than the outer diameter of the oil throwing ring.
[0015] In summary, this application includes the following beneficial technical effects: During operation, oil mist or splashed lubricating oil from the bearing housing adheres to the end face of the isolation comb ring near the bearing housing. After condensation, the lubricating oil mist or splashed lubricating oil collects in the oil collection groove along the end face of the isolation comb ring. Then, under gravity, it drips onto the outside of the isolation comb ring, reducing the possibility of lubricating oil entering the isolation seal. The outer diameter of the oil-slinging ring is larger than the inner diameter of the isolation comb ring, preventing sprayed or scattered lubricating oil mist from directly entering the comb teeth. The protruding oil-slinging ring disrupts the oil film tension, preventing lubricating oil from crawling through the locking nut surface into the isolation seal. Furthermore, as the rotating shaft drives the locking nut and oil-slinging ring to rotate, centrifugal force throws out the lubricating oil adhering to the oil-slinging ring, fundamentally blocking the passage for lubricating oil into the dry gas seal. This effectively prevents lubricating oil from intruding into the dry gas seal, reducing the risk of seal contamination and ensuring the performance of the dry gas seal and the long-term stable operation of the equipment. Simultaneously, it does not affect the emission of isolation gas at the dry gas seal, ensuring the isolation seal effect. Attached Figure Description
[0016] Figure 1 This is a partial structural diagram of a dry gas sealing device in related technologies. It is mainly used to show the position of the isolation comb ring and the locking nut. The arrows indicate the input and output directions of the isolation gas.
[0017] Figure 2 This is a structural schematic diagram of an embodiment of this application, wherein the arrows indicate the input and output directions of the isolation gas.
[0018] Explanation of reference numerals in the attached diagram: 1. Oil collecting ring; 2. Oil collecting groove; 3. Oil slinger ring; 4. Conical surface; 5. Isolation comb ring; 6. Rotating shaft; 7. Locking nut. Detailed Implementation
[0019] The following combination Figure 2 This application will be described in further detail.
[0020] This application discloses a combined oil-blocking structure for dry gas seals. (Refer to...) Figure 2 The combined oil-blocking structure for dry gas sealing includes an oil collecting ring 1 and an oil-throwing ring 3. The oil collecting ring 1 is fixedly installed on the side of the isolation comb ring 5 near the bearing housing. Specifically, to improve structural stability, the oil collecting ring 1 is integrally formed on the side of the isolation comb ring 5 near the bearing housing. In other embodiments, the oil collecting ring 1 can also be fixed to the isolation comb ring 5 by welding or screw connection. The oil collecting ring 1 is located between the isolation comb ring 5 and the bearing, and an annular oil collecting groove 2 is formed between the oil collecting ring 1 and the isolation comb ring 5.
[0021] Reference Figure 2 The oil slinger ring 3 is used to fix the locking nut 7 on the side near the bearing housing. Specifically, to improve structural stability, the oil slinger ring 3 is integrally formed on the side of the locking nut 7 near the bearing housing. In other embodiments, the oil slinger ring 3 can also be fixed to the locking nut 7 by welding or screw connection. The oil slinger ring 3 is located on the side of the isolation comb ring 5 near the bearing housing, that is, the oil slinger ring 3 is located between the isolation comb ring 5 and the bearing. The outer diameter of the oil slinger ring 3 is larger than the inner diameter of the isolation comb ring 5. The ring body of the isolation comb ring 5 refers to the part of the isolation comb ring 5 excluding the comb teeth.
[0022] During operation, some of the oil mist or splashed lubricating oil drifting from the bearing housing will adhere to the end face of the isolation comb ring 5 near the bearing housing. Then, the lubricating oil mist condenses or the splashed lubricating oil flows along the end face of the isolation comb ring 5 into the oil collection groove 2 for collection. The lubricating oil in the oil collection groove 2 then drips off the outside of the isolation comb ring 5 under gravity, thus reducing the possibility of lubricating oil entering the isolation seal. Meanwhile, the outer diameter of the oil slinger ring 3 is larger than the inner diameter of the isolation comb ring 5, forming a barrier between the comb teeth of the isolation comb ring 5 and the bearing housing. The remaining oil mist or lubricating oil drifting from the bearing housing will adhere to the end face of the oil slinger ring 3 near the bearing housing. This design prevents sprayed lubricating oil or drifting oil mist from directly entering the comb teeth. The raised oil-slinging ring 3 disrupts the oil film tension, preventing lubricating oil from crawling through the surface of the locking nut 7 into the isolation seal. Furthermore, during the rotation of the locking nut 7 and the oil-slinging ring 3 driven by the rotating shaft, the lubricating oil adhering to the oil-slinging ring 3 is flung out under centrifugal force, fundamentally blocking the passage of lubricating oil into the dry gas seal. This effectively prevents lubricating oil from intruding into the dry gas seal, reducing the possibility of disrupting the dynamic balance of the gas film, lowering the risk of seal contamination by lubricating oil, ensuring the performance of the dry gas seal and the long-term stable operation of the equipment. At the same time, it does not affect the emission of isolation gas at the dry gas seal, ensuring the isolation seal effect.
[0023] Reference Figure 2 The diameter of the end face of the oil collecting ring 1 near the bearing housing increases towards the bearing housing, and the diameter of the end face of the oil collecting ring 1 away from the bearing housing also increases towards the bearing housing. This forms a hook-shaped flow guide structure with the oil collecting ring 1 facing away from the locking nut 7, thereby forming an oil collecting groove 2 between it and the isolation comb ring 5. This allows the lubricating oil accumulated in the oil collecting groove 2 to drip off under gravity without dripping into the dry gas sealing channel. In other embodiments, the lower end of the oil collecting ring 1 near the isolation comb ring 5 can also be connected to a drainage channel to guide the lubricating oil back to the bearing housing.
[0024] Reference Figure 2 The minimum diameter of the end face of the oil collecting ring 1 near the bearing housing is equal to the inner diameter of the isolation comb ring 5, so that the oil collecting ring 1 will not affect the discharge of the isolation gas and guides the discharge of the isolation gas.
[0025] Reference Figure 2 Both the outer surfaces of the oil collecting ring 1 and the oil throwing ring 3 are cylindrical. The outer diameter of the oil collecting ring 1 is larger than that of the oil throwing ring 3, so that the lubricating oil dripping from the lower end of the oil collecting groove 2 is less likely to fall onto the side of the oil throwing ring 3 near the isolation comb ring 5, further ensuring that the lubricating oil is less likely to enter the dry gas sealing channel.
[0026] Reference Figure 2The end face of the oil slinger ring 3 away from the isolation comb ring 5 is a conical surface 4. The diameter of the conical surface 4 increases in the direction away from the isolation comb ring 5, thus forming an oil-blocking slope on the side of the oil slinger ring 3 away from the isolation comb ring 5. When the oil slinger ring 3 rotates at high speed, under the action of centrifugal force, the lubricating oil attached to the conical surface 4 can be thrown back to the bearing housing in the direction closer to the bearing housing. This helps to block the lubricating oil from entering the dry gas seal, ensuring the performance of the dry gas seal and the long-term stable operation of the equipment.
[0027] Reference Figure 2 Furthermore, the minimum diameter of the conical surface 4 is smaller than the outer diameter of the locking nut 7, thereby extending the conical surface 4 along the center of the locking nut 7, increasing the area of the conical surface 4, and allowing oil mist or splashed lubricating oil to be thrown out along the conical surface 4.
[0028] Reference Figure 2 The distance between the end face of the oil slinger ring 3 away from the bearing housing and the end face of the oil collecting ring 1 near the bearing housing is greater than the radial length of the comb teeth on the isolation comb ring 5. This ensures that the arrangement of the oil slinger ring 3 and the oil collecting ring 1 does not obstruct the discharge of isolation gas, guaranteeing the normal operation of the dry gas seal. The diameter of the end face of the oil slinger ring 3 near the isolation comb ring 5 increases towards the bearing housing. The minimum diameter of the end face of the oil slinger ring 3 near the isolation comb ring 5 is smaller than the inner diameter of the isolation comb ring 5. Furthermore, the minimum diameter of the end face of the oil slinger ring 3 near the isolation comb ring 5 is equal to the outer diameter of the locking nut 7, thus enabling better connection with the locking nut 7 and guiding the discharge of isolation gas.
[0029] The implementation principle of this application embodiment is as follows: During operation, a portion of the oil mist or splashed lubricating oil drifting from the bearing housing will adhere to the end face of the isolation comb ring 5 near the bearing housing. Then, after the lubricating oil mist condenses or the splashed lubricating oil flows along the end face of the isolation comb ring 5 into the oil collection groove 2 for collection. Then, the lubricating oil in the annular oil collection groove 2 drips off the outside of the isolation comb ring 5 under the action of gravity, thereby reducing the possibility of lubricating oil entering the isolation seal. The outer diameter of the oil slinger ring 3 is larger than the inner diameter of the isolation comb ring 5, so that the oil slinger ring 3 forms a barrier between the comb teeth of the isolation comb ring 5 and the bearing housing. Another portion of the oil mist or lubricating oil drifting from the bearing housing will adhere to the conical surface 4 of the oil slinger ring 3, preventing the sprayed lubricating oil or drifted lubricating oil from entering the isolation seal. The dispersed oil mist directly enters the comb teeth. The raised oil-throwing ring 3 disrupts the oil film tension, preventing lubricating oil from crawling through the surface of the locking nut 7 into the isolation seal. During the rotation of the locking nut 7 and the oil-throwing ring 3 driven by the rotating shaft, under the action of centrifugal force, the lubricating oil attached to the oil-throwing ring 3 is thrown out along the conical surface 4 towards the bearing housing, thus helping to block the passage of lubricating oil into the dry gas seal. This effectively prevents lubricating oil mist from condensing in the bearing housing or from splashing into the dry gas seal, and also prevents lubricating oil from entering the dry gas seal when the oil return system malfunctions. This greatly reduces the risk of the seal being contaminated by lubricating oil, ensuring the performance of the dry gas seal and the long-term stable operation of the equipment. At the same time, it does not affect the emission of isolation gas at the dry gas seal, ensuring the isolation seal effect.
[0030] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A combined oil-blocking structure for dry gas seals, characterized in that, include: Oil collecting ring (1), the oil collecting ring (1) is used to be installed on the isolation comb ring (5), and an oil collecting groove (2) is formed between the oil collecting ring (1) and the isolation comb ring (5); Oil slinger (3) is used to be installed on the locking nut (7). The oil slinger (3) is located on the side of the isolation comb ring (5) near the bearing box. The outer diameter of the oil slinger (3) is larger than the inner diameter of the isolation comb ring (5).
2. The combined oil-blocking structure for dry gas sealing according to claim 1, characterized in that: The end face of the oil-slinging ring (3) away from the isolation comb ring (5) is a conical surface (4), and the diameter of the conical surface (4) increases in the direction away from the isolation comb ring (5).
3. A combined oil-blocking structure for dry gas sealing according to claim 2, characterized in that: The minimum diameter of the conical surface (4) is smaller than the outer diameter of the locking nut (7).
4. A combined oil-blocking structure for dry gas sealing according to claim 2, characterized in that: The distance from the end face of the oil-slinging ring (3) near the isolation comb ring (5) to the end face of the oil-collecting ring (1) near the bearing housing is greater than the radial length of the comb teeth on the isolation comb ring (5).
5. A combined oil-blocking structure for dry gas sealing according to claim 2, characterized in that: The minimum diameter of the end face of the oil-slinging ring (3) near the isolation comb ring (5) is smaller than the inner diameter of the isolation comb ring (5).
6. A combined oil-blocking structure for dry gas sealing according to claim 1, characterized in that: The diameter of the oil collecting ring (1) on the end face near the bearing housing increases in the direction of approaching the bearing housing.
7. A combined oil-blocking structure for dry gas sealing according to claim 6, characterized in that: The minimum diameter of the end face of the oil collecting ring (1) near the bearing housing is equal to the inner diameter of the isolation comb ring (5).
8. A combined oil-blocking structure for dry gas sealing according to claim 1, characterized in that: The diameter of the end face of the oil collecting ring (1) away from the bearing housing increases toward the bearing housing.
9. A combined oil-blocking structure for dry gas seals according to any one of claims 1-8, characterized in that: The outer diameter of the oil collecting ring (1) is larger than the outer diameter of the oil throwing ring (3).