An oil mist-proof oil tank structure for a thrust bearing
By designing an oil mist-proof tank structure, utilizing condensation, labyrinth channels, and filter components, the problem of oil mist dispersion is solved, enabling safe equipment operation and efficient oil mist control, and adapting to the continuous requirements of space-constrained environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGCHUN INST OF TECH
- Filing Date
- 2025-08-01
- Publication Date
- 2026-06-19
AI Technical Summary
Existing oil mist control technologies are prone to atomization in high-temperature, high-shear, and high-speed friction environments, leading to oil mist dispersion, environmental pollution, and increased safety hazards. Furthermore, existing devices are bulky, costly, and have limited extraction efficiency, failing to meet the continuity requirements in space-constrained environments.
An anti-oil-mist tank structure was designed, including a built-in oil-mist condensation chamber, a labyrinth ventilation channel, a composite filter element assembly, and a negative pressure air extraction interface. Through condensation, labyrinth isolation, and filtration recovery functions, it achieves graded suppression and control of oil mist.
It effectively suppresses oil mist from source to end, ensuring safe equipment operation, improving environmental adaptability and maintenance convenience, reducing safety hazards, and improving pumping efficiency.
Smart Images
Figure CN224381213U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lubrication system control and sealing structure technology, and in particular to an oil mist prevention tank structure for thrust bearings. Background Technology
[0002] In large rotating machinery such as water turbines, thrust bearings play a crucial role. They need to bear huge axial loads for a long time and maintain high reliability. In this process, the lubrication of thrust bearings is critical. The role of lubricating oil is to form a stable oil film, thereby reducing friction, increasing load-bearing capacity, and extending the service life of the equipment. By providing appropriate lubrication, lubricating oil reduces direct contact between bearing surfaces and avoids equipment failure caused by wear or excessive friction. However, under some extreme working conditions, especially in environments with high temperature, high shear, and high-speed friction, lubricating oil is prone to atomization, forming a high-concentration oil-gas mixture, referred to as oil mist.
[0003] However, if not effectively controlled, it will threaten the safe operation of the equipment. In actual operation, oil mist will escape to the outside of the equipment through vents, shaft seal gaps, inspection holes and other paths. It will not only pollute the environment, but also have adverse effects on the surrounding equipment and systems. In particular, the high-concentration oil-gas mixture formed after the oil mist mixes with the air has a certain degree of flammability, which increases the safety hazards of fire and explosion. In addition, oil mist will enter the insulation system, causing the insulation material to age and degrade in performance, further affecting the reliability of the equipment.
[0004] Considering that existing oil mist control technologies mainly use external air extraction and filtration separation devices for collection, which have problems such as bulky structure, high cost, limited extraction efficiency, and slow system response, and are not effective in applications with limited space and high requirements for continuous operation, an anti-oil mist tank structure for thrust bearings is proposed to solve the above problems. Utility Model Content
[0005] To overcome the above shortcomings, this utility model provides an anti-oil mist tank structure for thrust bearings, aiming to improve the existing oil mist control technology, which mainly uses an external air extraction and filtration separation device for collection. This technology suffers from problems such as bulky structure, high cost, limited extraction efficiency, and slow system response. Furthermore, it is not effective in applications where space is limited and continuous operation is required.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: an anti-oil mist tank structure for thrust bearings, comprising a tank body, an upper shell isolation cover fixedly connected to the top of the tank body, an internal oil mist condensation chamber fixedly connected inside the upper shell isolation cover, an oil return guide groove provided outside the internal oil mist condensation chamber, a labyrinth ventilation channel provided at the top of the upper shell isolation cover, a composite filter element assembly fixedly connected to the right side of the labyrinth ventilation channel, a negative pressure air extraction port fixedly connected to the bottom of the composite filter element assembly, a condenser assembly installed inside the internal oil mist condensation chamber, and a multi-stage ventilation assembly installed outside the labyrinth ventilation channel;
[0007] The condenser assembly includes heat dissipation fins, which are externally fixedly connected to the inner wall of the built-in oil mist condensation chamber. The inner side of the heat dissipation fins is provided with flow guide ribs, and the outer side of the heat dissipation fins is provided with an oleophilic coating. The bottom of the heat dissipation fins is fixedly connected to a condensation zone drain port.
[0008] As a further description of the above technical solution:
[0009] The multi-stage ventilation assembly includes an inner sleeve ventilation channel, which is located outside the labyrinth ventilation channel. An outer sleeve structure is located inside the inner sleeve ventilation channel. A baffle is located at the bottom of the outer sleeve structure. A static pressure buffer chamber is located at the bottom of the baffle. A composite filter element assembly is fixedly connected inside the inner sleeve ventilation channel. A quick-release buckle device is installed outside the inner sleeve ventilation channel. An oil mist sensor mounting position is located at the top of the inner sleeve ventilation channel.
[0010] As a further description of the above technical solution:
[0011] The built-in oil mist condensation chamber is externally sleeved on the inner wall of the oil tank body.
[0012] As a further description of the above technical solution:
[0013] The bottom of the negative pressure exhaust port is fixedly connected to the outside of the upper housing isolation cover.
[0014] As a further description of the above technical solution:
[0015] The heat dissipation fins are externally fitted inside the upper housing isolation cover.
[0016] As a further description of the above technical solution:
[0017] The heat dissipation fins are externally fitted inside the oil tank body.
[0018] As a further description of the above technical solution:
[0019] The baffle plate is externally fitted inside the air passage of the inner sleeve.
[0020] As a further description of the above technical solution:
[0021] The static pressure buffer chamber is externally fitted inside the air passage of the inner sleeve.
[0022] This utility model has the following beneficial effects:
[0023] In this invention, an oil mist-proof oil tank structure integrating oil mist condensation, labyrinth isolation, filtration and recovery, and negative pressure extraction functions is used to achieve graded suppression and control of oil mist from source to end, ensuring equipment operation safety and improving environmental adaptability and maintenance convenience. Attached Figure Description
[0024] Figure 1 This is a three-dimensional schematic diagram of an oil mist prevention tank structure for a thrust bearing proposed in this utility model;
[0025] Figure 2 This is a schematic diagram of the built-in oil mist condensation chamber of an anti-oil mist oil tank structure for thrust bearings proposed in this utility model;
[0026] Figure 3 This is a schematic diagram of the labyrinth ventilation channel of an oil tank structure for thrust bearings that is designed to prevent oil mist.
[0027] Legend:
[0028] 1. Oil tank body; 2. Upper shell isolation cover; 3. Built-in oil mist condensation chamber; 4. Oil return guide groove; 5. Labyrinth ventilation channel; 6. Composite filter element assembly; 7. Negative pressure exhaust port; 31. Heat dissipation fins; 32. Guide ribs; 33. Oleophilic coating; 34. Condensation zone drain port; 51. Inner sleeve ventilation channel; 52. Outer sleeve structure; 53. Baffle plate; 54. Static pressure buffer chamber; 55. Composite filter element assembly; 56. Quick-release buckle device; 57. Oil mist sensor mounting position. Detailed Implementation
[0029] 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.
[0030] Reference Figures 1-3This utility model provides an embodiment of an anti-oil-mist oil tank structure for a thrust bearing, comprising an oil tank body 1, an upper shell isolation cover 2 fixedly connected to the top of the oil tank body 1, an internal oil mist condensation chamber 3 fixedly connected inside the upper shell isolation cover 2, an oil return guide groove 4 provided outside the internal oil mist condensation chamber 3, a labyrinth ventilation channel 5 provided at the top of the upper shell isolation cover 2, a composite filter element assembly 6 fixedly connected to the right side of the labyrinth ventilation channel 5, and a negative pressure suction port 7 fixedly connected to the bottom of the composite filter element assembly 6. The oil tank body 1 is located below the thrust bearing and is the main cavity for lubricating oil storage and recovery. The upper shell isolation cover 2 is installed on the top of the oil tank, and... A semi-enclosed structure is formed between the bearing parts to control the oil mist emission channel. The built-in oil mist condensation chamber 3 is arranged around the main shaft as the first contact interface for oil mist, and oil mist condensation is achieved through temperature difference. The oil return guide groove 4 is located at the bottom of the condensation chamber to guide the condensed droplets into the main oil chamber. The labyrinth ventilation channel 5 is located inside the top shell and is a complex airflow channel formed by inner and outer sleeves. The composite filter element assembly 6 is arranged at the ventilation outlet to adsorb and capture residual oil mist. The negative pressure exhaust port 7 is used to connect to the fan or oil-gas separation equipment to form an oil mist control closed loop. The built-in oil mist condensation chamber 3 is equipped with a condenser assembly, and the labyrinth ventilation channel 5 is equipped with a multi-stage ventilation assembly on the outside.
[0031] The condenser assembly includes heat dissipation fins 31, which are externally fixedly connected to the inner wall of the built-in oil mist condensation chamber 3. Guide ribs 32 are provided on the inner side of the heat dissipation fins 31, and an oleophilic coating 33 is provided on the outer side of the heat dissipation fins 31. A condensation zone drain port 34 is fixedly connected to the bottom of the heat dissipation fins 31. The heat dissipation fins 31 are attached to the inner wall of the condensation chamber to increase the heat dissipation area and improve the natural convection cooling capacity. The guide ribs 32 are located at the upper part of the chamber to guide the oil mist along the wall surface, enhancing the wall contact rate. The oleophilic coating 33 covers the guide grooves. The surface promotes rapid aggregation of droplets and their flow into the main oil passage. The condensate drain port 34 is located at the lowest point of the bottom and is connected to the return oil pipe to achieve liquid recovery. The multi-stage ventilation assembly includes an inner sleeve ventilation channel 51, which is located outside the labyrinth ventilation channel 5. An outer sleeve structure 52 is installed inside the inner sleeve ventilation channel 51. A baffle 53 is installed at the bottom of the outer sleeve structure 52. A static pressure buffer chamber 54 is installed at the bottom of the baffle 53. A composite filter element assembly 55 is fixedly connected inside the inner sleeve ventilation channel 51. The inner sleeve ventilation... The outer sleeve vent 51 is equipped with a quick-release buckle device 56. An oil mist sensor mounting position 57 is provided at the top of the inner sleeve vent 51. The inner sleeve vent 51 directly receives gas from the upper cavity of the bearing. The outer sleeve structure 52 surrounds the inner sleeve, forming a multi-layered labyrinth channel. A baffle 53 is placed in the ventilation path to create baffles, extending the oil mist retention time. A static pressure buffer chamber 54 is located at the end of the labyrinth to reduce airflow velocity and facilitate oil-gas separation. The composite filter element assembly 55 includes a coarse filter layer and a fine filter layer. The quick-release buckle device 56 enables rapid filter element replacement. Replacement and maintenance: The oil mist sensor mounting position 57 is used to monitor the oil mist concentration in the gas in real time. The built-in oil mist condensation chamber 3 is externally sleeved on the inner wall of the oil tank body 1. The bottom of the negative pressure exhaust port 7 is fixedly connected to the outside of the upper shell isolation cover 2. The heat dissipation fins 31 are externally sleeved inside the upper shell isolation cover 2. The heat dissipation fins 31 are externally sleeved inside the oil tank body 1. The baffle 53 is externally sleeved inside the inner sleeve ventilation channel 51. The static pressure buffer chamber 54 is externally sleeved inside the inner sleeve ventilation channel 51, so that all parts fit together tightly to ensure the normal operation of the equipment.
[0032] Working principle: The upper shell isolation cover 2 is installed above the oil tank body 1, forming a semi-enclosed space with the bearing area, which acts as a preliminary barrier to prevent oil mist from spreading outward. The built-in oil mist condensation chamber 3 is arranged around the center of the bearing, and comes into contact with the oil mist as it initially escapes. Rapid condensation is achieved through temperature difference. The condensed droplets return to the main cavity of the oil tank along the return oil guide groove 4 under the action of gravity, thereby realizing the recycling and reuse of oil mist. The labyrinth ventilation channel 5 is set at the top of the structure and is composed of inner and outer coaxial cylindrical structures, forming a functional baffle path and extending the flow path. The airflow path effectively reduces the carry-out rate of uncondensed oil mist. The composite filter element 6 is located at the end of the ventilation path to adsorb residual oil mist and ensure clean exhaust. The negative pressure exhaust port 7 serves as an auxiliary device interface, which can be optionally connected to an oil-gas separator or a fan to enhance the system's exhaust efficiency. The heat dissipation fins 31 are fixedly installed on the inner wall of the condensation chamber to expand the heat exchange area and improve the natural convection heat dissipation capacity. The guide ribs 32 are distributed in an arc shape on the inner wall of the top of the chamber to guide the oil mist to flow directionally along the wall surface, increasing the wall contact area and thus improving the oil mist's heat dissipation efficiency. The condensation efficiency of the mist is improved by an oleophilic coating 33 covering the guide groove and inner cavity wall, which has good oleophilic properties and can accelerate the adhesion and aggregation of microdroplets, enabling them to form a continuous liquid flow in a short time. The condensation zone drain port 34 is located at the lowest point of the cavity bottom. Through the inclined plane and the gravity of the droplets, the condensed oil is guided to the main oil tank, avoiding liquid accumulation or secondary escape. The inner sleeve vent 51 runs through the center of the upper shell and is connected to the upper cavity of the bearing, serving as the initial path for gas overflow. The outer sleeve structure 52 is fitted outside the inner sleeve, forming a complex structure with it. The filter features an annular air passage combined with baffles 53 to create a labyrinth structure, designed to turbulent the airflow and increase oil mist retention time. A static pressure buffer chamber 54, connected to the outlet of the labyrinth passage, is a gas velocity reduction zone, promoting further particulate matter settling and reducing the filtration burden. The composite filter element assembly 55 includes coarse and fine filtration structures, respectively used to intercept large droplets and adsorb particulate oil mist, ensuring clean exhaust. A quick-release clip device 56 is fixed to the filter element assembly mounting location, employing a clip-on mechanism design for rapid filter element replacement, improving system maintenance efficiency. An oil mist sensor mounting position 57 is reserved on the side wall of the filter element outlet channel for online installation of an oil mist concentration monitoring sensor, enabling real-time detection and alarm linkage.
[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An oil mist-proof oil tank structure for a thrust bearing, comprising an oil tank body (1), characterized by: The top of the oil tank body (1) is fixedly connected to an upper shell isolation cover (2), the upper shell isolation cover (2) is fixedly connected to an internal oil mist condensation chamber (3), the internal oil mist condensation chamber (3) is provided with an oil return guide groove (4) on the outside, the top of the upper shell isolation cover (2) is provided with a labyrinth ventilation channel (5), the right side of the labyrinth ventilation channel (5) is fixedly connected to a composite filter element assembly (6), the bottom of the composite filter element assembly (6) is fixedly connected to a negative pressure suction port (7), the internal oil mist condensation chamber (3) is installed with a condenser assembly, and the labyrinth ventilation channel (5) is installed with a multi-stage ventilation assembly on the outside; The condenser assembly includes heat dissipation fins (31), which are fixedly connected to the inner wall of the built-in oil mist condensation chamber (3). The inner side of the heat dissipation fins (31) is provided with flow guide ribs (32), the outer side of the heat dissipation fins (31) is provided with an oleophilic coating (33), and the bottom of the heat dissipation fins (31) is fixedly connected with a condensation zone drain port (34).
2. The oil mist-proof tank structure for a thrust bearing according to claim 1, characterized by: The multi-stage ventilation assembly includes an inner sleeve ventilation channel (51), which is located outside the labyrinth ventilation channel (5). An outer sleeve structure (52) is provided inside the inner sleeve ventilation channel (51). A baffle plate (53) is provided at the bottom of the outer sleeve structure (52). A static pressure buffer chamber (54) is provided at the bottom of the baffle plate (53). A composite filter element assembly (55) is fixedly connected inside the inner sleeve ventilation channel (51). A quick-release buckle device (56) is installed outside the inner sleeve ventilation channel (51). An oil mist sensor mounting position (57) is provided at the top of the inner sleeve ventilation channel (51).
3. The oil mist prevention tank structure for a thrust bearing according to claim 1, characterized in that: The built-in oil mist condensation chamber (3) is externally sleeved on the inner wall of the oil tank body (1).
4. The oil mist prevention tank structure for a thrust bearing according to claim 1, characterized in that: The bottom of the negative pressure air extraction port (7) is fixedly connected to the outside of the upper housing isolation cover (2).
5. The oil mist prevention tank structure for a thrust bearing according to claim 1, characterized in that: The heat dissipation fins (31) are externally fitted inside the upper housing isolation cover (2).
6. The oil mist prevention tank structure for a thrust bearing according to claim 1, characterized in that: The heat dissipation fins (31) are externally fitted inside the oil tank body (1).
7. The oil mist prevention tank structure for a thrust bearing according to claim 2, characterized in that: The baffle plate (53) is externally fitted inside the air passage (51) of the inner sleeve.
8. The oil mist prevention tank structure for a thrust bearing according to claim 2, characterized in that: The static pressure buffer chamber (54) is externally fitted inside the air passage (51) of the inner sleeve.