Winding and fixing type brush type sealing structure and mounting method thereof

Abstract

The invention provides a winding and fixing type brush type sealing structure. The winding and fixing type brush type sealing structure comprises a first protruding shoulder and a second protruding shoulder which are arranged on a first-stage wheel disc. A middle baffle plate is arranged between the convex shoulder I and the convex shoulder II, and a brush bundle is wound on the middle baffle plate; two free ends of the brush bundle are respectively in vertical contact with the surfaces of the convex shoulder I and the convex shoulder II, the brush bundle is in vertical contact with the contact surface of the first-stage wheel disc, and the surfaces, in contact with the convex shoulder I and the convex shoulder II, of the two free ends of the brush bundle are coated with wear-resistant coatings, so that brush type sealing is formed; the top of the middle baffle and the top of the brush bundle are clamped through the C-shaped clamp and wrapped by the front baffle and the rear baffle in sequence outside the C-shaped clamp, and the middle baffle, the brush bundle and the middle baffle form a brush ring. The contact area of the free end of the brush bundle and the contact pair is changed, the structures of the front baffle and the rear baffle are adjusted, the middle baffle is added, and meanwhile the installation flexibility of the sealing device is improved through the designed installable shoulder structure; the brush bundle is divided into two parts, and the function that a first-stage brush ring structure forms two-stage brush ring sealing is achieved.

Description

Technical Field

[0001] The present invention relates to a wound-type brush seal structure and an installation method thereof, and in particular to a brush seal device having forward and reverse rotation sealing functions, accommodating radial deformation or offset of a rotor, and having high sealing performance, and is suitable for sealing gas between rotating and stationary blades of turbine machinery. Background Art

[0002] In turbine machinery, air leakage between the rotor and stator blades can seriously impact overall performance. Conventionally, grate teeth are used for sealing, but due to the presence of tooth tip clearance, this sealing efficiency is low. With the advancement of turbine technology, air leakage has become a significant factor affecting turbine performance. By reducing air leakage, turbine performance can be significantly improved with relatively low investment. For example, certain advanced engine sealing technologies can increase engine thrust by 1% to 3% and reduce fuel consumption by 3% to 5%.

[0003] As an advanced sealing technology, brush seals have a leakage rate of only 10% to 20% of that of comb seals, and the special structure of the brush bundle can effectively deal with problems such as radial runout and deformation of the rotor. However, brush seals also have disadvantages. The free end of the brush bundle of a traditional brush seal is in direct contact with the surface of the wheel disc. In order to deal with radial runout or deformation of the wheel disc, the brush bundle and the wheel disc surface must have an assembly inclination angle, but this also limits the rotation direction of the rotor. After the brush ring is assembled with the rotor, the rotor is not allowed to rotate in the opposite direction of the brush bundle inclination. In many actual engineering applications, the sealing device needs to achieve sealing performance when the wheel disc rotates in the forward and reverse directions without causing damage to the sealing device. When multi-stage brush seals need to be arranged, the overall weight of the brush ring device is relatively large, which increases the difficulty of controlling the deadweight of the aircraft engine. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a wound-type brush seal structure and an installation method thereof, which can realize the sealing function when the rotor rotates forward and reverse, and has both high sealing performance and the ability to cope with radial runout and deformation of the rotor.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a wound-type brush sealing structure, which includes a boss one and a boss two arranged on a first-stage wheel disc; an intermediate baffle is provided between the boss one and the boss two, and a brush bundle is wound on the intermediate baffle; the two free ends of the brush bundle are in vertical contact with the surfaces of the boss one and the boss two respectively, and the contact surface of the brush bundle and the first-stage wheel disc is in vertical contact, and the surfaces of the two free ends of the brush bundle in contact with the boss one and the boss two are coated with a wear-resistant coating to form a brush seal; the top of the intermediate baffle and the brush bundle are clamped by a C-shaped clamp, and are wrapped in turn by the front baffle and the rear baffle outside the C-shaped clamp to form an inverted T-shaped brush ring with the brush bundle and the intermediate baffle.

[0007] The boss 1 is fixedly connected to the first-stage wheel disc via bolt 2.

[0008] The second boss is fixedly connected to the first-stage wheel disc via a third bolt.

[0009] The inner diameter surface of the intermediate baffle is coated with a wear-resistant coating.

[0010] The intermediate baffle is in an inverted T shape, and an assembly gap is left between the inner diameter of the intermediate baffle and the first-stage wheel.

[0011] The brush bundle is made of non-metallic brush wire or metal brush wire.

[0012] The non-metallic brush filaments include aramid fiber filaments, quartz glass fiber filaments or carbon fiber filaments.

[0013] The metal brush filaments include cobalt alloy, nickel alloy or GH5188.

[0014] The structures of the first and second bosses are the same, both being 360-degree ring structures, and each ring structure is divided into two 180-degree ring segments.

[0015] A method for installing a wound-type brush seal structure comprises the following steps:

[0016] ① Install the two sections of shoulder 2 onto the first-stage disc to form a complete ring, and fix it to the first-stage disc with bolt 3;

[0017] ②Put the brush ring onto the mounting seat at the lower end of the guide blade, clamp the brush ring with the clamping plate, and fix it with bolts;

[0018] ③ Install the two sections of shoulder 1 onto the first-stage disc to form a complete ring, and fix it to the first-stage disc with bolt 2;

[0019] After installation is completed, the two free ends of the brush bundle are in vertical contact with the first and second bosses respectively, forming an interference fit.

[0020] The beneficial effects of the present invention are: changing the contact area between the free end of the brush bundle and the contact pair, adjusting the front and rear baffle structures, adding a middle baffle, and at the same time, the designed installable boss structure improves the flexibility of the sealing device installation; dividing the brush bundle into two, realizing the function of forming a two-stage brush ring seal from a one-stage brush ring structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 Schematic diagram of the contact angle between the free end of the brush bundle and the shoulder of the present invention;

[0023] Figure 3 Schematic diagram of the present invention applied to sealing between rotor and stator blades;

[0024] Figure 4 is a cross-sectional view of an assembly drawing of the present invention;

[0025] Figure 5 It is a top view of the present invention after assembly;

[0026] In the figure: 1-zero-stage working blade, 2-zero-stage wheel, 3-guide blade, 4-first-stage working blade, 5-first-stage wheel, 6-outer casing, 7-mounting seat, 8-clamp, 9-bolt one, 10-brush bundle, 11-front baffle, 12-rear baffle, 13-C-shaped clamp, 14-middle baffle, 15-wear-resistant coating, 16-shoulder one, 17-bolt two, 18-shoulder two, 19-bolt three. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0028] like Figure 3 As shown, the zero-stage working blade 1 and the first-stage working blade 4 are respectively installed on the zero-stage wheel 2 and the first-stage wheel 5, the guide blade 3 is installed on the outer casing 6, and the lower end of the guide blade 3 is this structure.

[0029] like Figure 1 As shown, the first-stage wheel disc 5 is provided with a boss 16 and a boss 2 18, so that the brush bundle 10 contacts the first-stage wheel disc 5, and the surfaces are in vertical contact, as shown in FIG. Figure 2 The contact portion of the side surfaces of the shoulder 16 and the shoulder 2 18 with the brush bundle 10 is coated with a wear-resistant coating 15, which can achieve a reliable sealing function when the wheel 5 rotates forward and backward, thereby increasing the service life of the brush ring.

[0030] Specifically, a C-shaped clip 13 is used to fix the middle area of ​​the brush bundle 10 to the top of the middle baffle 14. Since the brush bundle 10 has a large structural deformation, the brush wire material is selected to be a metal brush wire with a smaller diameter or a non-metallic brush wire with good toughness.

[0031] Preferably, the brush filament diameter and brush bundle thickness of the brush ring are 0.05 mm and 0.4 mm respectively, and may also be other values.

[0032] The material of the brush filaments in the brush ring can be non-metallic brush filaments (aramid fiber filaments, quartz glass fiber filaments, carbon fiber filaments) and metal brush filaments (cobalt alloy, nickel alloy, GH5188), or other materials.

[0033] Furthermore, under the joint action of the front baffle 11, the rear baffle 12 and the middle baffle 14, the brush bundle 10 is fixed and shaped, and the two free ends of the brush bundle 10 respectively form a brush ring with the boss 16 and the boss 2 18 to present a two-stage brush sealing effect.

[0034] When the present structure is sealed, the high-pressure side airflow is blocked by the first-stage brush seal, and only a small portion of the leaked airflow enters the cavity formed by the first-stage wheel 5, the first boss 16, the second boss 18, the inner diameter surface of the middle baffle 14 and the brush bundle 10, and then passes through the second-stage brush seal to further reduce the leakage of the airflow.

[0035] Specifically, a clearance exists between the inner diameter of the inverted T-shaped center baffle 14 and the surface of the primary disc 5. This clearance prevents radial runout or deformation of the primary disc 5, which could cause dynamic or static wear. Furthermore, to prevent significant vibration of the primary disc 5 in extreme situations, a wear-resistant coating 15 is applied to the inner diameter of the center baffle 14 to mitigate damage from wear.

[0036] Preferably, in order to ensure the sealing performance of this structure, the brush ring is designed to be a full ring structure, such as Figure 5 As shown, the shoulder 16 and the shoulder 2 18 have the same structure, both of which are 360-degree ring structures. For ease of installation, each ring structure is divided into two 180-degree ring sections.

[0037] like Figure 4 As shown, during installation, first attach the two 180° arc segments of shoulder 2 18 to the primary disc 5 to form a complete ring, which is then secured to the disc 5 with bolt 3 19. Next, insert the brush ring into the mounting seat 7 at the lower end of the guide vane 3, clamp the brush ring with clamping plate 8, and secure it with bolt 1 9. Finally, attach the two 180° arc segments of shoulder 16 to the primary disc 5 to form a complete ring, which is then secured to the disc 5 with bolt 2 17. After installation, the free ends of the brush bundle 10 are in perpendicular contact with shoulder 16 and shoulder 2 18, respectively, forming an interference fit.

[0038] Furthermore, the brush ring is a full-ring structure, and the convex shoulder is two equally divided 180° arc segments.

[0039] Specifically, since the brush bundle 10 has no inclination angle in the circumferential direction and is in vertical contact with the boss, sealing can be achieved when the primary wheel disc 5 rotates forward or backward.

[0040] A middle baffle 14 structure is added to the brush ring, which divides the brush bundle 10 into two, achieving the purpose of forming a two-stage brush ring seal with a one-stage brush ring structure. Under one brush ring structure, a two-stage brush sealing structure is realized, which greatly improves the sealing performance and eliminates the adverse effects of welding on the brush bundle 10.

[0041] The brush filaments are fixed by a winding structure, and the brush bundle 10 is shaped by the front, middle and rear baffles to form a brush-type sealing structure with the side of the boss installed on the first-stage wheel 5.

[0042] In summary, the beneficial effects of the present invention are:

[0043] 1. The free end of the brush bundle is in vertical contact with the shoulder. Whether the first-stage wheel is rotating in the forward or reverse direction, the sealing function can be achieved without causing irreversible damage to the brush bundle.

[0044] 2. When the first-stage impeller undergoes radial runout or deformation, the gap between the inner diameter surface of the middle baffle and the first-stage impeller can prevent dynamic and static friction damage;

[0045] 3. Due to the special structure of the brush bundle, the single-stage brush ring can achieve the sealing effect of the double-stage brush seal, thereby improving the sealing performance of the structure;

[0046] 4. The brush wire is fixed in a winding manner to avoid the disadvantages caused by welding;

[0047] 5. The boss is a detachable structure, which facilitates the installation and disassembly of the sealing structure.

Claims

1. A wound-type brush seal structure, comprising a first shoulder (16) and a second shoulder (18) provided on a first-stage wheel (5), characterized in that: An intermediate baffle (14) is provided between the first shoulder (16) and the second shoulder (18), and a brush bundle (10) is wound around the intermediate baffle (14); the two free ends of the brush bundle (10) are in vertical contact with the surfaces of the first shoulder (16) and the second shoulder (18), respectively, and the contact surface of the brush bundle (10) and the first-stage wheel (5) is in vertical contact, and the surfaces of the two free ends of the brush bundle (10) in contact with the first shoulder (16) and the second shoulder (18) are coated with a wear-resistant coating (15) to form a brush seal; the top of the intermediate baffle (14) and the brush bundle (10) are clamped by a C-shaped clamp (13), and are wrapped in turn by a front baffle (11) and a rear baffle (12) outside the C-shaped clamp (13), forming an inverted T-shaped brush ring with the brush bundle (10) and the intermediate baffle (14).

2. The wound-type brush seal structure according to claim 1, wherein: The boss 1 (16) is fixedly connected to the first-stage wheel disc (5) via bolt 2 (17).

3. The wound-type brush seal structure according to claim 1, wherein: The second boss (18) is fixedly connected to the first-stage wheel disc (5) via a third bolt (19).

4. The wound-type brush seal structure according to claim 1, wherein: The inner diameter surface of the intermediate baffle (14) is coated with a wear-resistant coating (15).

5. The wound-type brush seal structure according to claim 1, wherein: The intermediate baffle (14) is in an inverted T-shape, and an assembly gap is left between the inner diameter of the intermediate baffle (14) and the primary wheel (5).

6. The wound-type brush seal structure according to claim 1, wherein: The brush bundle (10) is made of non-metallic brush filaments or metallic brush filaments.

7. The wrap-around brush seal structure according to claim 6, wherein: The non-metallic brush filaments include aramid fiber filaments, quartz glass fiber filaments or carbon fiber filaments.

8. The wound-type brush seal structure according to claim 6, wherein: The metal brush filaments include cobalt alloy, nickel alloy or GH5188.

9. The wound-type brush seal structure according to claim 1, wherein: The structures of the shoulder 1 (16) and the shoulder 2 (18) are the same, both are 360-degree ring structures, and each ring structure is divided into two 180-degree ring sections.

10. A method for installing a wound-type brush seal structure, characterized in that: The following steps are involved: ① Install the two sections of the second boss (18) onto the first wheel disc (5) to form a complete ring, and fix it to the first wheel disc (5) through the third bolt (19); ② Slide the brush ring onto the mounting seat (7) at the lower end of the guide blade (3), clamp the brush ring with the clamping plate (8), and secure it with bolt 1 (9); ③ Install the two sections of boss 1 (16) on the first-stage wheel disc (5) to form a complete ring, and fix it on the first-stage wheel disc (5) with bolt 2 (17); After installation is completed, the two free ends of the brush bundle (10) are in vertical contact with the first convex shoulder (16) and the second convex shoulder (18) respectively, forming an interference fit.

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