Bearing cavity carbon fiber brush type sealing structure with oil guide groove
By designing an annular metal bushing with a flow guide groove in the bearing cavity carbon fiber brush seal structure, the problem of degradation of sealing performance and lubricant leakage caused by the 'moving lift effect' of carbon fiber brush seal is solved, and more efficient sealing performance and lower environmental pollution are achieved.
Patent Information
- Application Number
- CN202520774649.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2035-04-23
AI Technical Summary
During operation, the brush wire floats up due to the "moving rise effect" and forms gaps, increasing the sealing gas consumption, reducing the unit's operating efficiency, and may cause lubricant leakage and environmental pollution.
A carbon fiber brush seal structure of bearing cavity with oil guide groove is designed. By adding an annular metal bushing with a flow guide groove on the rotor, the flow guide groove is inclined to the rotor rotation direction, and the depth gradually increases along the axial direction of the rotor. The outer surface of the annular metal bushing is inclined from the outside of the bearing cavity to the inside, realizing the timely discharge of lubricating oil and weakening the "moving rise effect" of the brush wire.
By reducing the "moving lift effect" of the brush wire, the consumption of pressurized sealing gas is reduced, the amount of lubricating oil leakage is reduced, the tightness of the seal is improved, the unit operation efficiency is enhanced, and environmental pollution is reduced.
Smart Images
Figure CN222949966U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bearing cavity sealing, in particular to a bearing cavity carbon fiber brush type sealing structure with an oil guide groove. Background Art
[0002] In turbomachinery such as gas turbines and aircraft engines, bearing cavity sealing technology is crucial. Its function is to isolate the lubricating oil inside the bearing cavity from the airflow environment outside, reduce lubricating oil leakage and prevent pressurized sealing gas from entering the bearing cavity. Traditional sealing technology is difficult to meet the needs of efficient and safe operation of modern turbomachinery due to limited sealing performance or high friction heat.
[0003] As a new sealing technology, carbon fiber brush seals have gradually become the first choice for the new generation of high-performance impeller machinery bearing cavity seals due to their excellent sealing performance and low friction heat. However, in practical applications, carbon fiber brush seals face a key problem: "dynamic lift effect".
[0004] Specifically, during the operation of the carbon fiber brush seal, the lubricating oil will gradually seep into the brush bundle and gather at the top of the brush and the surface of the rotor to form a lubricating oil film. The high-speed rotation of the rotor drives the high-viscosity lubricating oil to move tangentially, generating local high pressure at the top of the brush. This high pressure causes the brush to be subjected to the "dynamic lift" of the lubricating oil, causing the brush to float and form a gap with the rotor surface. Due to the "dynamic lift effect", the direct contact between the brush and the rotor is destroyed, forming a gap, causing the pressurized sealing gas to leak into the bearing cavity through the gap, increasing the sealing gas consumption and reducing the unit's operating efficiency. At the same time, the accumulated lubricating oil may also leak to the outside of the bearing cavity, causing environmental pollution. Utility Model Content
[0005] The utility model aims to provide a bearing cavity carbon fiber brush seal structure with an oil guide groove to solve the problems raised in the above background technology.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] A carbon fiber brush seal structure for a bearing cavity with an oil guide groove, comprising
[0008] An annular metal bushing, wherein a rotor is movably sleeved inside the annular metal bushing, and a stator is movably sleeved outside the annular metal bushing;
[0009] An annular front baffle and an annular rear baffle are fixedly installed on the inner ring circumference of the stator component, and the annular front baffle and the annular rear baffle are arranged side by side along the axial direction. A brush bundle is clamped between the annular front baffle and the annular rear baffle, and the inner ring wall surface of the brush bundle is slidably connected to the outer ring wall surface of the annular metal bushing.
[0010] Preferably, a boss is integrally formed on the outside of one side of the annular metal bushing, and a plurality of guide grooves are provided with equal arcs on the outer wall surface of the annular metal bushing away from the boss;
[0011] Preferably, the boss is connected to the guide groove, and the outer wall surface of the annular metal bushing forms an angle 1 with the axial direction of the rotor, and the value range of the angle 1 is 5-10°;
[0012] Preferably, the guide groove forms an angle 2 with the axial direction of the rotor, and the value range of the angle 2 is 10-30°;
[0013] Preferably, the number of the guide grooves is four, six or eight, and they have the same size;
[0014] Preferably, the brush filament bundle is made of carbon fiber.
[0015] Compared with the prior art, the beneficial effects of the utility model are:
[0016] The carbon fiber brush seal structure of a bearing cavity with an oil guide groove is provided by adding an annular metal bushing with a guide groove on the rotor, and the guide groove is inclined in the direction of rotation of the rotor, the depth of the guide groove gradually increases along the axial direction of the rotor, and the outer surface of the annular metal bushing is inclined from the outer side of the bearing cavity to the inner side of the bearing cavity, so that the lubricating oil on the top of the brush wire bundle and the outer surface of the rotor is discharged in time, thereby weakening the "dynamic lift effect" on the brush wire, reducing the consumption of pressurized sealing gas, reducing the leakage of lubricating oil, and thus improving the tightness of the seal. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the installation structure of the annular metal bushing of the utility model;
[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the guide groove of the utility model;
[0019] Figure 3 This is a schematic diagram of the brush bundle installation structure of the utility model.
[0020] In the figure: 1. annular metal bushing; 2. rotor; 3. stator; 4. annular front baffle; 5. annular rear baffle; 6. brush bundle; 7. boss; 8. guide groove. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0022] like Figure 1-3 As shown, a technical solution provided by the utility model:
[0023] A carbon fiber brush seal structure for a bearing cavity with an oil guide groove comprises an annular metal bushing 1, a rotor 2 is movably sleeved inside the annular metal bushing 1, a stator 3 is movably sleeved outside the annular metal bushing 1, an annular front baffle 4 and an annular rear baffle 5 are fixedly installed in the inner circumference of the stator 3, the annular front baffle 4 and the annular rear baffle 5 are arranged side by side in the axial direction, a brush bundle 6 is clamped between the annular front baffle 4 and the annular rear baffle 5, and the inner ring wall surface of the brush bundle 6 is connected to the annular The outer ring wall of the annular metal bushing 1 is slidably connected, and a boss 7 is integrally formed on the outside of one side of the annular metal bushing 1. The annular metal bushing 1 has a boss 7 located on the outside of the bearing cavity and directly connected to the guide groove 8, which can prevent the lubricating oil from directly entering the outside of the bearing cavity through the smooth outer surface of the annular metal bushing 1 or the guide groove 8. The outer surface of the annular metal bushing 1 and the axial direction of the rotor 2 have an angle of one, so that the outer surface of the annular metal bushing 1 forms a certain slope along the axial direction of the rotor 2 (from the outside of the bearing cavity to the inside of the bearing cavity). Such a structure is conducive to the lubricating oil on the surface of the annular metal bushing 1 and the top of the brush wire bundle 6 to be discharged into the bearing cavity, which is conducive to further weakening the "dynamic lift effect" of the lubricating oil on the brush wire, thereby further improving the tightness of the carbon fiber brush seal of the bearing cavity. A plurality of guide grooves 8 are arranged with equal arcs on the outer wall surface of the annular metal bushing 1 on one side away from the boss 7. The boss 7 is connected to the guide groove 8, and the outer wall surface of the annular metal bushing 1 forms an angle with the axial direction of the rotor 2. 1. Angle 1 has a value range of 5 to 10°. Angle 2 is formed between the guide groove 8 and the axial direction of the rotor 2. Angle 2 has a value range of 10 to 30°. By setting angle 2, when the rotor 2 rotates, the high-viscosity lubricating oil in the guide groove 8 is subjected to the tangential force of the rotor 2. The component of the tangential force in the centerline direction of the guide groove 8 is conducive to the lubricating oil in the guide groove 8 being discharged into the bearing cavity. The number of guide grooves 8 is four, six or eight, and they are of the same size. The material of the brush bundle 6 is carbon fiber;
[0024] Among them, the brush wire bundle 6 has an interference amount (the value range is 0 to 0.2 mm) with the outer surface of the annular metal bushing 1, and the interference amount remains unchanged along the axial direction of the rotor 2. It should be noted that since the outer surface of the annular metal bushing 1 is inclined from the outer side of the bearing cavity to the inner side of the bearing cavity, the length of each layer of brush wires of the brush wire bundle 6 along the axial direction of the rotor 2 will gradually increase to maintain the interference amount with the outer surface of the annular metal bushing 1 unchanged.
[0025] In this embodiment, an annular metal bushing 1 with a guide groove 8 is added to the rotor 2, and the guide groove 8 is inclined in the rotation direction of the rotor 2, the depth of the guide groove 8 gradually increases along the axial direction of the rotor 2, and the outer surface of the annular metal bushing 1 is inclined from the outside of the bearing cavity to the inside of the bearing cavity, so that the lubricating oil on the top of the brush wire bundle 6 and the outer surface of the rotor 2 is discharged in time, thereby weakening the "dynamic lift effect" on the brush wire, reducing the consumption of pressurized sealing gas, reducing the leakage of lubricating oil, and thereby improving the tightness of the seal.
[0026] Working principle: By adding an annular metal bushing 1 with a guide groove 8 to the rotor 2, and making the guide groove 8 tilted in the direction of rotation of the rotor 2, the depth of the guide groove 8 gradually increases along the axial direction of the rotor 2, and the outer surface of the annular metal bushing 1 tilted from the outer side of the bearing cavity to the inner side of the bearing cavity. A part of the lubricating oil will flow into the guide groove 8 with the rotation of the annular metal bushing 1 and the obstruction of the brush wire bundle 6, and finally flow back to the bearing cavity along the flow channel of the guide groove 8 under the action of the component force of the tangential force of the rotor 2 in the direction of the centerline of the guide groove 8 and gravity; the other part of the lubricating oil will flow along the outer surface of the inclined annular metal bushing 1 to the inner side of the bearing cavity due to the action of gravity, and finally flow back to the bearing cavity. The above two working principles will enable the lubricating oil on the top of the brush wire bundle 6 and the outer surface of the rotor 2 to be discharged in time, thereby weakening the "dynamic lift effect" of the brush wire, reducing the consumption of pressurized sealing gas, reducing the amount of lubricating oil leakage, and thus improving the tightness of the seal.
[0027] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. A carbon fiber brush seal structure for a bearing cavity with an oil guide groove, characterized in that: include An annular metal bushing (1), wherein a rotor (2) is movably sleeved inside the annular metal bushing (1), and a stator (3) is movably sleeved outside the annular metal bushing (1); An annular front baffle (4) and an annular rear baffle (5) are fixedly mounted on the inner ring of the stator component (3); the annular front baffle (4) and the annular rear baffle (5) are arranged side by side in the axial direction; a brush bundle (6) is clamped between the annular front baffle (4) and the annular rear baffle (5); the inner ring wall surface of the brush bundle (6) is slidably connected to the outer ring wall surface of the annular metal bushing (1).
2. A carbon fiber brush seal structure for a bearing cavity with an oil guide groove according to claim 1, characterized in that: A boss (7) is integrally formed on the outside of one side of the annular metal bushing (1), and a plurality of guide grooves (8) are provided with equal arcs on the outer wall surface of the annular metal bushing (1) away from the boss (7).
3. A carbon fiber brush seal structure for a bearing cavity with an oil guide groove according to claim 2, characterized in that: The boss (7) is connected to the guide groove (8), and an outer wall surface of the annular metal bushing (1) forms an angle 1 with the axial direction of the rotor (2), and the value range of the angle 1 is 5 to 10 degrees.
4. A carbon fiber brush seal structure for a bearing cavity with an oil guide groove according to claim 3, characterized in that: The guide groove (8) and the axial direction of the rotor (2) form an included angle 2, and the value range of the included angle 2 is 10 to 30 degrees.
5. A carbon fiber brush seal structure for a bearing cavity with an oil guide groove according to claim 4, characterized in that: The number of the guide grooves (8) is four, six or eight, and they have the same size.
6. A carbon fiber brush seal structure for a bearing cavity with an oil guide groove according to claim 4, characterized in that: The brush bundle (6) is made of carbon fiber.