Double-end-face brush type-labyrinth combined sealing structure

Abstract

The utility model relates to the technical field of turbine mechanical sealing, and discloses a double-end-face brush type-labyrinth combined sealing structure, which comprises a shaft sleeve connected with a rotor through a shaft sleeve fastening screw; a sealing seat; the double-end-face brush type sealing ring is fixedly arranged with the sealing seat through a brush ring set screw; the double-end-face brush type sealing ring comprises a first brush wire bundle, a front baffle, a first fusion welding area, a middle baffle, a second fusion welding area, a rear baffle and a second brush wire bundle. The labyrinth sealing ring is arranged on the back face of the double-end-face brush type sealing ring, an O-shaped ring is arranged between the labyrinth sealing ring and the sealing seat, the labyrinth sealing ring is fixed to the shell through a check ring, and the shell is connected with the sealing seat through a screw. The double-end-face brush type seal and the labyrinth seal are combined, the double-end-face brush type seal ring saves more materials and space compared with a conventional two-stage end face brush type seal in series connection, the throttling effect of the labyrinth seal plays an auxiliary sealing role, and therefore the sealing effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of turbine mechanical seals, in particular to a double-end face brush-type-labyrinth combined seal structure. Background Art

[0002] Sealing technology is a key factor influencing turbine performance and lifespan, directly impacting machine efficiency and fuel consumption. Turbines such as aircraft engines and gas turbines typically contain over 50 seals, primarily located between compressor stages, between the turbine's stator and rotor, and between bearing cavities and fan blades. These seals prevent and minimize fluid leakage.

[0003] The dynamic seals used in turbine machinery include: non-contact labyrinth seals, graphite circumferential seals, floating ring seals and air film seals, but they all have certain defects: although the non-contact labyrinth seal has a simple structure and low cost, it will cause wear due to the contact between the grate teeth and the bushing, increasing leakage; the floating ring seal relies on the oil film generated between the high-speed rotating floating ring and the shaft to seal. When the operating environment fluctuates greatly, it will affect the oil film formation, resulting in seal failure; the graphite circumferential seal has a certain ability to withstand large radial runout and angular deviation, but can only withstand a runout of no more than 1mm, which is difficult to meet new design requirements; although the end face air film seal technology can complete its work under high friction linear speed and high temperature and high pressure conditions, when the rotor vibrates or deforms, the displacement of the sealing surface is much higher than the air film thickness, which greatly affects the sealing effect.

[0004] To this end, we proposed a double-end brush-labyrinth combined sealing structure to solve the problem. Utility Model Content

[0005] The purpose of the utility model is to provide a double-end face brush-labyrinth combined sealing structure, which solves the problems in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a double-end brush-labyrinth combined sealing structure, comprising:

[0007] A shaft sleeve, wherein the shaft sleeve is connected to the rotor via a shaft sleeve set screw;

[0008] Sealing seat;

[0009] Double-end brush seal ring, fixed to the seal seat by brush ring set screws;

[0010] The double-end face brush seal ring includes: a first brush bundle, a front baffle, a first fusion welding area, a middle baffle, a second fusion welding area, a rear baffle, and a second brush bundle;

[0011] The labyrinth sealing ring is arranged on the back of the double-end brush sealing ring. An O-ring is arranged between the labyrinth sealing ring and the sealing seat, and is fixed to the housing through a retaining ring. The housing is connected to the sealing seat through screws.

[0012] Preferably, one end of the first brush bundle and the second brush bundle is a free end, and is sealed and mounted on a sprayed surface on the shaft sleeve, and the sprayed surface is perpendicular to the rotor.

[0013] Preferably, the first brush bundle is located between the front baffle and the middle baffle, and the roots between the first brush bundle, the front baffle and the middle baffle are welded; the second brush bundle is located between the middle baffle and the rear baffle, and the roots between the second brush bundle, the middle baffle and the rear baffle are welded.

[0014] Preferably, the thickness of the first brush bundle is 3.0 mm to 4.0 mm, the protection height of the front baffle is 2.0 mm to 4.0 mm, the protection height of the middle baffle is 1.0 mm to 2.0 mm, and the protection height of the rear baffle is 1.0 mm to 2.0 mm.

[0015] Preferably, the angle formed by the first brush bundle, the second brush bundle and the radial direction of the rotor is 30° to 50°.

[0016] Preferably, the diameter of the brush filaments of the first brush filament bundle and the second brush filament bundle is 0.06 mm to 0.08 mm.

[0017] The utility model provides a double-end brush-labyrinth combined sealing structure. The double-end brush-labyrinth combined sealing structure has the following beneficial effects:

[0018] 1. The brush seal of the sealing structure adopted by the utility model has small wear, simple structure, light weight and small leakage. With its advantages, it is widely used in various turbine machinery fields such as aircraft engines, industrial gas turbines and water turbines, providing a solution for improving machine performance.

[0019] 2. The utility model combines a double-end face brush seal and a labyrinth seal. The double-end face brush seal ring saves more materials and space than the conventional two-stage end face brush seal in series, and the throttling effect of the labyrinth seal plays an auxiliary sealing role, so the sealing effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the double-end face brush seal ring structure of the present utility model.

[0022] In the picture:

[0023] 1. Shaft sleeve set screw; 2. Shaft sleeve; 3. Double-end brush seal ring; 4. Brush ring set screw; 5. Labyrinth seal ring; 6. O-ring; 7. Retaining ring; 8. Rotor; 9. Seal seat; 10. Screw; 11. Housing;

[0024] 21. Spraying surface;

[0025] 31. First brush bundle; 32. Front baffle; 33. First fusion welding zone; 34. Middle baffle; 35. Second fusion welding zone; 36. Rear baffle; 37. Second brush bundle. DETAILED DESCRIPTION

[0026] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described with reference to the accompanying drawings.

[0027] A preferred embodiment of a double-end brush-labyrinth combined sealing structure provided by the utility model is as follows Figures 1 to 2 Shown: A double-end brush-labyrinth combined sealing structure, comprising:

[0028] The shaft sleeve 2 is connected to the rotor 8 via the shaft sleeve set screw 1;

[0029] Sealing seat 9;

[0030] The double-end brush seal ring 3 is fixed to the seal seat 9 by the brush ring set screw 4;

[0031] The double-end face brush seal ring 3 includes: a first brush bundle 31, a front baffle 32, a first fusion welding area 33, an intermediate baffle 34, a second fusion welding area 35, a rear baffle 36, and a second brush bundle 37;

[0032] Here, one end of the first brush bundle 31 and the second brush bundle 37 is a free end, and is sealed and mounted on the spray surface 21 on the sleeve 2. The spray surface 21 is perpendicular to the rotor 8. When the rotor 8 rotates, the sleeve 2 is driven to rotate, and the free end of the brush filaments and the spray surface 21 slide circumferentially.

[0033] The first brush bundle 31 is located between the front baffle 32 and the middle baffle 34, and the roots of the first brush bundle 31, the front baffle 32, and the middle baffle 34 are welded. The second brush bundle 37 is located between the middle baffle 34 and the rear baffle 36, and the roots of the second brush bundle 37, the middle baffle 34, and the rear baffle 36 are welded.

[0034] Among them, the thickness of the first brush bundle 31 is 3.0 mm, the protection height of the front baffle 32 is 2.0 mm, the protection height of the middle baffle 34 is 1.0 mm, and the protection height of the rear baffle 36 is 1.0 mm. The angle formed by the first brush bundle 31 and the second brush bundle 37 and the radial direction of the rotor 8 is 30°, and the brush diameter of the first brush bundle 31 and the second brush bundle 37 is 0.06 mm.

[0035] The labyrinth sealing ring 5 is arranged on the back side of the double-end brush sealing ring 3. An O-ring 6 is arranged between the labyrinth sealing ring 5 and the sealing seat 9, and is fixed to the housing 11 through a retaining ring 7. The axial length can be adjusted according to the installation size. The housing 11 is connected to the sealing seat 9 by screws 10.

[0036] The above is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any technician in this field without departing from the concept and principle of the present invention should fall within the scope of protection of the present invention. It should also be noted that the various components of the present invention are not limited to the above-mentioned overall application. The various technical features described in the specification of the present invention can be selected for use alone or in combination according to actual needs. Therefore, the present invention naturally covers other combinations and specific applications related to the utility model points of this case.

Claims

1. A double-end brush-labyrinth combined sealing structure, characterized by: include: A shaft sleeve (2), wherein the shaft sleeve (2) is connected to a rotor (8) via a shaft sleeve set screw (1); Sealing seat (9); A double-end face brush seal ring (3) is fixed to a seal seat (9) via a brush ring set screw (4); The double-end face brush seal ring (3) comprises: a first brush bundle (31), a front baffle (32), a first fusion welding area (33), an intermediate baffle (34), a second fusion welding area (35), a rear baffle (36), and a second brush bundle (37); A labyrinth seal ring (5) is arranged on the back side of a double-end face brush seal ring (3); an O-ring (6) is arranged between the labyrinth seal ring (5) and a seal seat (9); and the labyrinth seal ring (5) is fixed to a housing (11) via a retaining ring (7); and the housing (11) is connected to the seal seat (9) via screws (10).

2. The double-end brush-labyrinth combined seal structure according to claim 1, characterized in that: One end of the first brush bundle (31) and the second brush bundle (37) is a free end, and is sealed and mounted on a spraying surface (21) on the shaft sleeve (2), wherein the spraying surface (21) is perpendicular to the rotor (8).

3. The double-end face brush-labyrinth combined seal structure according to claim 1, characterized in that: The first brush bundle (31) is located between the front baffle (32) and the middle baffle (34), and the roots of the first brush bundle (31), the front baffle (32), and the middle baffle (34) are welded together. The second brush bundle (37) is located between the middle baffle (34) and the rear baffle (36), and the roots of the second brush bundle (37), the middle baffle (34), and the rear baffle (36) are welded together.

4. The double-end brush-labyrinth combined seal structure according to claim 1, characterized in that: The thickness of the first brush bundle (31) is 3.0 mm to 4.0 mm, the protection height of the front baffle (32) is 2.0 mm to 4.0 mm, the protection height of the middle baffle (34) is 1.0 mm to 2.0 mm, and the protection height of the rear baffle (36) is 1.0 mm to 2.0 mm.

5. The double-end brush-labyrinth combined seal structure according to claim 1, characterized in that: The angle formed by the first brush bundle (31), the second brush bundle (37) and the radial direction of the rotor (8) is 30° to 50°.

6. The double-end brush-labyrinth combined seal structure according to claim 1, characterized in that: The diameters of the brush filaments of the first brush filament bundle (31) and the second brush filament bundle (37) are 0.06 mm to 0.08 mm.

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