Brush-type sealing structure based on flexible bristle breakage protection

Abstract

This invention discloses a brush-type sealing structure based on flexible bristle breakage protection, comprising a front baffle, a rear baffle, and a bristle bundle composed of bristles. One end of the bristle bundle is close to the rotor, and the other end is away from the rotor. The end of the bristle bundle away from the rotor is a fixed end. The structure also includes: a rigid fastener, a flexible fastener, and a flexible support pad. The front and rear baffles are fixedly connected by the rigid fastener, forming a fixed space. The flexible fastener and the flexible support pad are installed within the fixed space. The flexible fastener has a tightening arc surface, and the flexible support pad has a supporting arc surface. The tightening and supporting arc surfaces can clamp and fix the end of the bristle bundle away from the rotor. The supporting arc surface protrudes outwards, with the protrusion direction away from the rotor, while the tightening arc surface is concave inwards, with the protrusion direction being the same as the concavity direction. The rigid fastener applies a preload force to the flexible fastener along the rotor radial direction. This invention reduces the risk of bristle breakage by providing protection for the bristles.

Description

Technical Field

[0001] This invention relates to the field of brush seals, and more particularly to a brush seal structure based on flexible brush filament breakage protection. Background Technology

[0002] Rotor-stationary sealing technology primarily aims to effectively control leakage between rotating and non-rotating components in turbomachinery. Brush sealing, as a contact-type dynamic sealing technology, utilizes flexible brush bristles that effectively adapt to the rotor's thermal expansion and radial runout, mitigating collisions and wear between the rotor and stator, and improving rotor safety and stability. It is one of the key technologies in the development of modern advanced turbomachinery.

[0003] Brush sealing technology, due to its excellent sealing performance, is widely used in gas turbines, aero engines, and steam turbines. For example... Figure 17 As shown, a traditional brush seal structure mainly consists of three parts: a front baffle, a rear baffle, and a bristle bundle. The front baffle primarily serves to fix the bristle bundle in conjunction with the rear baffle. The rear baffle mainly supports the bristle bundle, preventing significant axial bending deformation of the bristles under high pressure differential.

[0004] With the continuous development of high-performance engines, their sealing structures operate under harsh conditions such as high temperature, high pressure, and high swirling flow, which inevitably places higher demands on the stability of the sealing structure. The seemingly simple brush-type sealing structure has extremely complex internal flow. Airflow leaks through the tiny gaps in the brush filament bundle. Simultaneously, the brush filament closure effect, stiffening effect, hysteresis effect, and axial and circumferential bending deformation all significantly impact sealing performance and service life. Along with these adverse effects, the brush filaments are prone to breakage.

[0005] Brush filament breakage mainly includes two types: one is breakage at the weld joint. Under the combined action of aerodynamic forces in three dimensions and contact forces and friction forces between the brush filament and the rotor, the brush filament and the back baffle, and adjacent brush filaments, the brush filament undergoes bending deformation, generating tensile and reaction forces along the direction of the brush filament. The forces are mainly concentrated at the weld joint between the brush filament and the brush-type sealing structure. Analyzing the brush filament as a cantilever beam reveals that the shear force and bending moment at the weld joint reach their maximum values, which easily leads to breakage at the weld joint. The other type is internal breakage of the brush filament.

[0006] Broken brush filaments can reduce the sealing performance and stability of the brush seal structure, and may even lead to breakage. The detached fine filaments can then impact rotor blades or rub against the rotor, causing serious consequences such as complete engine malfunction – a highly dangerous situation. Therefore, to ensure stable engine operation, it is necessary to protect the brush filaments to reduce the risk of breakage. Summary of the Invention

[0007] There are two main types of brush bristle breakage: one is breakage at the weld joint, and the other is internal breakage. Since internal breakage mainly depends on factors such as the bristle material and the working environment, structural improvements are limited. Therefore, this invention mainly addresses the problem of brush bristle breakage at the weld joint by providing a brush-type sealing structure based on flexible bristle breakage protection. By providing protection for the bristles, the risk of brush bristle breakage can be reduced.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows:

[0009] A brush-type sealing structure based on flexible brush filament breakage protection includes a front baffle, a rear baffle, and a brush filament bundle composed of brush filaments. One end of the brush filament bundle is close to the rotor, and the other end of the brush filament bundle is away from the rotor. The end of the brush filament bundle away from the rotor is a fixed end. It also includes: a rigid fastener, a flexible fastener, and a flexible support pad.

[0010] The front baffle and the rear baffle are fixedly connected by rigid fasteners, and the front baffle, the rear baffle, and the rigid fasteners form a fixed space. The flexible fasteners and the flexible support pads are installed in the fixed space.

[0011] The flexible fastener has a fastening arc surface, and the flexible support pad has a support arc surface. The fastening arc surface and the support arc surface can clamp and fix the end of the brush filament bundle away from the rotor. The support arc surface protrudes outward from the flexible support pad, and the protrusion direction of the support arc surface is away from the rotor. The fastening arc surface is recessed inward from the flexible fastener, and the protrusion direction of the support arc surface is the same as the recess direction of the fastening arc surface.

[0012] The rigid fastener can apply a preload to the flexible fastener along the rotor radial direction.

[0013] Furthermore, it also includes a bristle retaining shell and a bristle winding shaft;

[0014] The bristle fixing shell is used to accommodate the fixing end. The bristle fixing shell is installed in a fixed space. The bristle winding shaft is arranged inside the bristle fixing shell. The bristle winding shaft cooperates with the bristle fixing shell to clamp and fix the fixing end.

[0015] Furthermore, the fixed end is wound around the brush filament winding shaft and the end face of the fixed end abuts against the flexible support pad, and the brush filaments of the fixed end are welded together.

[0016] Furthermore, the brush filament winding shaft is located at the center of the fixed end, and the brush filaments at the fixed end are welded together with the brush filament winding shaft at their contact points.

[0017] Furthermore, the end face of the fixed end abuts against the inner wall of the fixed space, and the brush bristles of the fixed end are welded together with the inner wall of the fixed space at their contact points.

[0018] Furthermore, the fixed end is fixed to the front baffle and / or the rear baffle.

[0019] Furthermore, it also includes an elastic element disposed between the rigid fastener and the flexible fastener.

[0020] Furthermore, it also includes threaded fasteners, and the front baffle, rear baffle and rigid fasteners are fixedly connected by threaded fasteners;

[0021] After the rigid fastener is fixedly connected to the front baffle and the rear baffle by the threaded fastener, the rigid fastener squeezes the flexible fastener, causing the flexible fastener to shrink radially along the rotor, thereby applying a preload force to the brush bundle between the fastening arc surface and the supporting arc surface.

[0022] Furthermore, it also includes sealing rings, with sealing rings provided between the front baffle and the rigid fastener, and between the rear baffle and the rigid fastener.

[0023] The beneficial effects of this invention are:

[0024] This invention discloses a brush-type sealing structure based on flexible bristle breakage protection. When the bristle bundle is subjected to tensile and reaction forces, the bristles fixed between the flexible fastener and the flexible support are subjected to static friction forces in opposite directions, thereby balancing part of the tensile force acting on the fixed end. The flexible support provides support for the bristle bundle, and the supporting arc surface provides support force to reduce the shear force and bending moment on the fixed end bristles, thereby reducing the risk of bristle breakage and improving bristle stability. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of Embodiment 1 of a brush-type sealing structure based on flexible brush filament breakage protection disclosed in this invention;

[0027] Figure 2 This is a schematic diagram of a flexible fastener based on a brush-type sealing structure with flexible brush filament breakage protection disclosed in this invention.

[0028] Figure 3 This is a schematic diagram of a flexible support pad based on a brush-type sealing structure with flexible filament breakage protection disclosed in this invention.

[0029] Figure 4This is a schematic diagram of a brush-type sealing structure embodiment 1 based on flexible brush filament breakage protection disclosed in this invention, showing the removal of flexible fasteners and flexible support pads;

[0030] Figure 5 This is a schematic diagram of Embodiment 2 of a brush-type sealing structure based on flexible brush filament breakage protection disclosed in this invention;

[0031] Figure 6 This is a schematic diagram of embodiment 3 of a brush-type sealing structure based on flexible brush filament breakage protection disclosed in this invention;

[0032] Figure 7 This is a schematic diagram of embodiment 4 of a brush-type sealing structure based on flexible brush filament breakage protection disclosed in this invention;

[0033] Figure 8 This is a schematic diagram of embodiment 5 of the brush-type sealing structure based on flexible brush filament breakage protection disclosed in this invention;

[0034] Figure 9 This is a schematic diagram of embodiment 6 of a brush-type sealing structure based on flexible brush filament breakage protection disclosed in this invention;

[0035] Figure 10 This is a schematic diagram of embodiment 7 of a brush-type sealing structure based on flexible brush filament breakage protection disclosed in this invention;

[0036] Figure 11 This is a schematic diagram of embodiment 8 of a brush-type sealing structure based on flexible brush filament breakage protection disclosed in this invention;

[0037] Figure 12 This is a schematic diagram of embodiment 9 of a brush-type sealing structure based on flexible brush filament breakage protection disclosed in this invention;

[0038] Figure 13 This is a schematic diagram of embodiment 10 of a brush-type sealing structure based on flexible brush filament breakage protection disclosed in this invention;

[0039] Figure 14 This is a schematic diagram of embodiment 10 of the brush sealing structure based on flexible brush filament breakage protection disclosed in this invention, showing the removal of elastic elements and flexible fasteners;

[0040] Figure 15 This is a schematic diagram of a flexible fastener according to Embodiment 10 of a brush-type sealing structure based on flexible brush filament breakage protection disclosed in this invention.

[0041] Figure 16 This is an assembly diagram of a rigid fastener based on a brush-type sealing structure with flexible brush filament breakage protection disclosed in this invention.

[0042] Figure 17This is a schematic diagram of a conventional brush-type sealing structure disclosed in this invention;

[0043] In the picture:

[0044] 1. Front bezel;

[0045] 2. Rear bumper;

[0046] 3. Brush bristle bundle;

[0047] 4. Rigid fasteners; 41. Positioning groove; 42. Sealing ring mounting groove; 43. Threaded fastener mounting hole; 44. Fixing groove;

[0048] 5. Flexible fasteners; 51. Positioning blocks; 52. Fastening arc surfaces; 53. Fixing blocks;

[0049] 6. Flexible support pad; 61. Support arc surface;

[0050] 7. Welding zone;

[0051] 8. Brush bristle fixing shell;

[0052] 9. Brush bristles are wound around the shaft;

[0053] 10. Elastic elements;

[0054] 11. Threaded fasteners;

[0055] 12. Fixing bolts;

[0056] A. Rotor; B. Upstream of the bristles; C. Downstream of the bristles. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] Example 1

[0059] This embodiment provides a brush-type sealing structure based on flexible bristle breakage protection, such as... Figures 1 to 4 As shown, it includes a front baffle 1, a rear baffle 2, and a bristle bundle 3 composed of bristles. One end of the bristle bundle 3 is close to the rotor A, and the other end of the bristle bundle 3 is away from the rotor A. The end of the bristle bundle 3 away from the rotor A is a fixed end. It also includes a rigid fastener 4, a flexible fastener 5, and a flexible support pad 6.

[0060] The front baffle 1 and the rear baffle 2 are fixedly connected by rigid fasteners 4. The front baffle 1, the rear baffle 2 and the rigid fasteners 4 form a fixed space. The flexible fasteners 5 and the flexible support pads 6 are installed in the fixed space.

[0061] like Figure 2 As shown, the flexible fastener 5 is provided with a fastening arc surface 52, such as... Figure 3 As shown, the flexible support pad 6 is provided with a support arc surface 61. The fastening arc surface 52 and the support arc surface 61 can clamp and fix the end of the brush filament bundle 3 away from the rotor. The support arc surface 61 protrudes outward from the flexible support pad 6, and the protrusion direction of the support arc surface 61 is away from the rotor. The fastening arc surface 52 is recessed inward from the flexible fastener 5. The protrusion direction of the support arc surface 61 is the same as the recess direction of the fastening arc surface 52.

[0062] The rigid fastener 5 can apply a pre-tightening force to the flexible fastener 5 along the radial direction of the rotor, so that the brush bristles are tightly attached to the fastening arc surface 52 of the flexible fastener 5 and the supporting arc surface 61 of the flexible support 6 under the action of the pre-tightening force, thereby fixing the brush bristle bundle 3. At the same time, the flexible fastener 5 and the flexible support pad 6 do not generate rigid friction with the brush bristles, which can effectively protect the brush bristles.

[0063] When the bristle bundle 3 is subjected to tension and reaction forces, the bristles fixed between the flexible fastener 5 and the flexible support 6 will experience static friction forces in opposite directions, thereby balancing part of the tension acting on the fixed end. The flexible support 6 is used to provide support for the bristle bundle 3, and the support arc surface 61 provides support force to reduce the shear force and bending moment on the fixed end bristles, thereby reducing the risk of bristle breakage and improving bristle stability.

[0064] In a specific embodiment, the end face of the fixed end abuts against the inner wall of the fixed space, and the brush bristles of the fixed end are welded together with the inner wall of the fixed space to form a fusion welding zone 7. Without the aid of an auxiliary fixing structure, the fixed end is directly fixed to the inner wall of the fixed space. The structure is simple, occupies little space, and is suitable for engines with limited casing space.

[0065] In a specific embodiment, the end of the brush filament bundle 3 away from the rotor is divided into two bundles of brush filaments, so that the fixed end is divided into two parts. The two parts of the fixed end are respectively fixed on the front baffle 1 and the rear baffle 2. The brush filament bundle 3 is distributed on both sides, which can convert all the pre-tightening force applied by the rigid fastener 4 into pressure on the brush filaments, thereby increasing the static friction force on the brush filaments to reduce the tensile force on the welding zone 7.

[0066] It should be noted that the two bristle bundles 3, which are fixed on the front baffle 1 and the rear baffle 2 respectively, can have an appropriate ratio selected according to the actual working conditions and requirements.

[0067] In a specific embodiment, a threaded fastener 11 is also included. The front baffle 1, the rear baffle 2 and the rigid fastener 4 are fixedly connected by the threaded fastener 11. The rigid fastener 4 is provided with a threaded fastener mounting hole 43 for installing the threaded fastener 11.

[0068] After the rigid fastener 4 is fixedly connected to the front baffle 1 and the rear baffle 2 by the threaded fastener 11, the rigid fastener 4 squeezes the flexible fastener 5 to cause the flexible fastener 5 to shrink radially along the rotor, thereby applying a pre-tightening force to the brush bundle 3 between the fastening arc surface 52 and the supporting arc surface 61.

[0069] In a specific embodiment, a sealing ring is also included. A sealing ring is provided between the front baffle 1 and the rigid fastener 4, and between the rear baffle 2 and the rigid fastener 4. The sealing ring is installed in the sealing ring mounting groove 42 provided in the rigid fastener 4 to ensure the airtightness after the front baffle 1, the rear baffle 2 and the rigid fastener 4 are fixedly connected.

[0070] In a specific embodiment, such as Figure 2 As shown, the flexible fastener 5 has a positioning part 51 and a fixing part 53 at the end away from the brush filament bundle 3, such as... Figure 4 As shown, the rigid fastener 4 is provided with corresponding positioning groove 41 and fixing groove 44. The positioning part 51 is placed in the positioning groove 41, which makes it convenient for installers to position the flexible fastener 5 and the rigid fastener 4 and assemble them together. The fixing part 53 is placed in the fixing groove 44 to improve the stability of the connection between the flexible fastener 5 and the rigid fastener 4.

[0071] In practical applications, rigid fasteners 4 are usually made in an arc shape for ease of manufacturing and installation, such as... Figure 16 As shown, multiple rigid fasteners 4 are fixedly connected together by fixing bolts 12.

[0072] Example 2

[0073] The working principle and main structure of the brush-type sealing structure based on flexible brush filament breakage protection provided in this embodiment are the same as those in Embodiment 1. The structural difference between this embodiment and Embodiment 1 is as follows:

[0074] In Embodiment 1, the end of the brush filament bundle 3 away from the rotor is divided into two bundles of brush filaments, so that the fixed end is divided into two parts, and the two parts of the fixed end are respectively fixed on the front baffle 1 and the rear baffle 2.

[0075] In this embodiment, as Figure 5As shown, the fixed end is fixed on the rear baffle 2. When the fixed end is fixed on the rear baffle 2, the tip of the brush filament bundle 3 (the end of the brush filament bundle near the rotor) will tilt upstream of the brush filament B. In actual application, under the action of pressure difference, the tip of the brush filament bundle 3 will bend axially, which can reduce the friction force generated by the contact between the brush filament bundle 3 and the rear baffle 2, and prevent the brush filament from having a hysteresis effect. It is suitable for high pressure difference and high speed conditions.

[0076] Example 3

[0077] The working principle and main structure of the brush-type sealing structure based on flexible brush filament breakage protection provided in this embodiment are the same as those in Embodiment 1. The structural difference between this embodiment and Embodiment 1 is as follows:

[0078] In Embodiment 1, the end of the brush filament bundle 3 away from the rotor is divided into two bundles of brush filaments, so that the fixed end is divided into two parts, and the two parts of the fixed end are respectively fixed on the front baffle 1 and the rear baffle 2.

[0079] In this embodiment, as Figure 6 As shown, the fixed end is fixed on the front baffle 1. When the fixed end is fixed on the front baffle 1, the tip of the bristle bundle 3 will tilt downstream C. In actual application, because the bristles tilt downstream C, the gap between the bristles will be further reduced under pressure difference, which can improve the sealing performance. It is suitable for low speed conditions, such as water or oil and other fluids with slow flow rates.

[0080] Example 4

[0081] This embodiment provides a brush-type sealing structure based on flexible brush filament breakage protection, including a front baffle 1, a rear baffle 2 and a brush filament bundle 3 composed of brush filaments. One end of the brush filament bundle 3 is close to the rotor, and the other end of the brush filament bundle 3 is away from the rotor. The end of the brush filament bundle 3 away from the rotor is a fixed end. It also includes: a rigid fastener 4, a flexible fastener 5 and a flexible support pad 6.

[0082] The front baffle 1 and the rear baffle 2 are fixedly connected by rigid fasteners 4. The front baffle 1, the rear baffle 2 and the rigid fasteners 4 form a fixed space. The flexible fasteners 5 and the flexible support pads 6 are installed in the fixed space.

[0083] The flexible fastener 5 is provided with a fastening arc surface 52, and the flexible support pad 6 is provided with a support arc surface 61. The fastening arc surface 52 and the support arc surface 61 can clamp and fix the end of the brush filament bundle 3 away from the rotor. The support arc surface 61 protrudes outward from the flexible support pad 6, and the protrusion direction of the support arc surface 61 is away from the rotor. The fastening arc surface 52 is recessed inward from the flexible fastener 5, and the protrusion direction of the support arc surface 61 is the same as the recess direction of the fastening arc surface 52.

[0084] The rigid fastener 5 can apply a pre-tightening force to the flexible fastener 5 along the radial direction of the rotor, so that the brush bristles are tightly attached to the fastening arc surface 52 of the flexible fastener 5 and the supporting arc surface 61 of the flexible support 6 under the action of the pre-tightening force, thereby fixing the brush bristle bundle 3. At the same time, the flexible fastener 5 and the flexible support pad 6 do not generate rigid friction with the brush bristles, which can effectively protect the brush bristles.

[0085] When the bristle bundle 3 is subjected to tension and reaction forces, the bristles fixed between the flexible fastener 5 and the flexible support 6 will experience static friction forces in opposite directions, thereby balancing part of the tension acting on the fixed end. The flexible support 6 is used to provide support for the bristle bundle 3, and the support arc surface 61 provides support force to reduce the shear force and bending moment on the fixed end bristles, thereby reducing the risk of bristle breakage and improving bristle stability.

[0086] In a specific embodiment, such as Figure 7 As shown, it also includes a bristle fixing shell 8 and a bristle winding shaft 9;

[0087] The bristle fixing shell 8 is used to accommodate the fixing end. The bristle fixing shell 8 is installed in the fixing space. The bristle winding shaft 9 is arranged inside the bristle fixing shell 8. The bristle winding shaft 9 cooperates with the bristle fixing shell 8 to clamp and fix the fixing end.

[0088] In a specific embodiment, the brush filament winding shaft 9 is located at the center of the fixed end, which can reduce the diameter of the brush filament fixing shell 8, thereby reducing the space occupied by the engine casing. The brush filaments at the fixed end are welded together with the brush filament winding shaft 9 to form a fusion welding zone 7.

[0089] In a specific embodiment, the end of the brush filament bundle 3 away from the rotor is divided into two bundles of brush filaments, so that the fixed end is divided into two parts. The two parts of the fixed end are indirectly fixed in the grooves provided on the front baffle 1 and the rear baffle 2 through the brush filament fixing shell 8. The brush filament bundle 3 is distributed on both sides, which can convert all the pre-tightening force applied by the rigid fastener 4 into pressure on the brush filaments, thereby increasing the static friction force on the brush filaments to reduce the tensile force on the welding zone 7.

[0090] It should be noted that the two bristle bundles 3, which are fixed on the front baffle 1 and the rear baffle 2 respectively, can have an appropriate ratio selected according to the actual working conditions and requirements.

[0091] In a specific embodiment, a threaded fastener 11 is also included. The front baffle 1, the rear baffle 2 and the rigid fastener 4 are fixedly connected by the threaded fastener 11. The rigid fastener 4 is provided with a threaded fastener mounting hole 43 for installing the threaded fastener 11.

[0092] After the rigid fastener 4 is fixedly connected to the front baffle 1 and the rear baffle 2 by the threaded fastener 11, the rigid fastener 4 squeezes the flexible fastener 5 to cause the flexible fastener 5 to shrink radially along the rotor, thereby applying a pre-tightening force to the brush bundle 3 between the fastening arc surface 52 and the supporting arc surface 61.

[0093] In a specific embodiment, a sealing ring is also included. A sealing ring is provided between the front baffle 1 and the rigid fastener 4, and between the rear baffle 2 and the rigid fastener 4. The sealing ring is installed in the sealing ring mounting groove 42 provided in the rigid fastener 4 to ensure the airtightness after the front baffle 1, the rear baffle 2 and the rigid fastener 4 are fixedly connected.

[0094] In a specific embodiment, the flexible fastener 5 is provided with a positioning part 51 and a fixing part 53 at the end away from the brush filament bundle 3, and the rigid fastener 4 is provided with a corresponding positioning groove 41 and a fixing groove 44. The positioning part 51 is placed in the positioning groove 41, which makes it convenient for installers to position the flexible fastener 5 and the rigid fastener 4 and assemble them together. The fixing part 53 is placed in the fixing groove 44 to improve the stability of the connection between the flexible fastener 5 and the rigid fastener 4.

[0095] In practical applications, rigid fasteners 4 are usually made into an arc shape for ease of manufacturing and installation, and multiple rigid fasteners 4 are fixedly connected together by fixing bolts 12.

[0096] Example 5

[0097] The working principle and main structure of the brush-type sealing structure based on flexible brush filament breakage protection provided in this embodiment are the same as those in embodiment 4. The structural difference between this embodiment and embodiment 4 is as follows:

[0098] In a specific embodiment, the end of the brush bristle bundle 3 away from the rotor is divided into two bristle bundles, so that the fixed end is divided into two parts.

[0099] In this embodiment, as Figure 8 As shown, the fixed end is fixed on the rear baffle 2. When the fixed end is fixed on the rear baffle 2, the tip of the brush bristle bundle 3 will tilt upstream of the brush bristles B. In actual application, under the action of pressure difference, the tip of the brush bristle bundle 3 will bend axially, which can reduce the friction force generated by the contact between the brush bristle bundle 3 and the rear baffle 2, and prevent the brush bristles from having a hysteresis effect. It is suitable for high pressure difference and high speed working conditions.

[0100] Example 6

[0101] The working principle and main structure of the brush-type sealing structure based on flexible brush filament breakage protection provided in this embodiment are the same as those in embodiment 4. The structural difference between this embodiment and embodiment 4 is as follows:

[0102] In embodiment 4, the end of the brush filament bundle 3 away from the rotor is divided into two bundles of brush filaments, so that the fixed end is divided into two parts, and the two parts of the fixed end are respectively fixed on the front baffle 1 and the rear baffle 2.

[0103] In this embodiment, as Figure 9 As shown, the fixed end is fixed on the front baffle 1. When the fixed end is fixed on the front baffle 1, the tip of the bristle bundle 3 will tilt downstream C. In actual application, because the bristles tilt downstream C, the gap between the bristles will be further reduced under pressure difference, which can improve the sealing performance. It is suitable for low speed conditions, such as water or oil and other fluids with slow flow rates.

[0104] Example 7

[0105] The working principle and main structure of the brush-type sealing structure based on flexible brush filament breakage protection provided in this embodiment are the same as those in embodiment 4. The structural difference between this embodiment and embodiment 4 is as follows:

[0106] In embodiment 4, the brush filament winding shaft 9 is located at the center of the fixed end, which can reduce the diameter of the brush filament fixing shell 8 and thus reduce the space occupied by the engine casing. The brush filaments at the fixed end are welded together with the brush filament winding shaft 9 to form a fusion welding zone 7.

[0107] In this embodiment, as Figure 10 As shown, the fixed end is wound around the brush filament winding shaft 9 and the end face of the fixed end abuts against the flexible support pad 6. The brush filaments of the fixed end are welded together to form a fusion welding zone 7. The fusion welding zone 7 prevents the fixed end from spreading out and avoids uneven tips of the brush filament bundle 3. Compared with embodiment 4, the diameter of the brush filament fixing shell 8 is increased. The fixed end can be clamped and fixed by the brush filament fixing shell 8. The brush filaments and the brush filament winding shaft 9 do not need to be fused and welded, which reduces the difficulty of welding.

[0108] It should be noted that the fixed end can also be welded together with the brush filament winding shaft 9 according to the actual working conditions and usage requirements.

[0109] Example 8

[0110] The working principle and main structure of the brush-type sealing structure based on flexible brush filament breakage protection provided in this embodiment are the same as those in embodiment 7. The difference between this embodiment and embodiment 7 in terms of structure is as follows:

[0111] In embodiment 7, the end of the brush filament bundle 3 away from the rotor is divided into two bundles of brush filaments, so that the fixed end is divided into two parts, and the two parts of the fixed end are respectively fixed on the front baffle 1 and the rear baffle 2.

[0112] In this embodiment, as Figure 11As shown, the fixed end is fixed on the rear baffle 2. When the fixed end is fixed on the rear baffle 2, the tip of the brush bristle bundle 3 will tilt upstream of the brush bristles B. In actual application, under the action of pressure difference, the tip of the brush bristle bundle 3 will bend axially, which can reduce the friction force generated by the contact between the brush bristle bundle 3 and the rear baffle 2, and prevent the brush bristles from having a hysteresis effect. It is suitable for high pressure difference and high speed working conditions.

[0113] Example 9

[0114] The working principle and main structure of the brush-type sealing structure based on flexible brush filament breakage protection provided in this embodiment are the same as those in embodiment 7. The difference between this embodiment and embodiment 7 in terms of structure is as follows:

[0115] In embodiment 7, the end of the brush filament bundle 3 away from the rotor is divided into two bundles of brush filaments, so that the fixed end is divided into two parts, and the two parts of the fixed end are respectively fixed on the front baffle 1 and the rear baffle 2.

[0116] In this embodiment, as Figure 12 As shown, the fixed end is fixed on the front baffle 1. When the fixed end is fixed on the front baffle 1, the tip of the bristle bundle 3 will tilt downstream C. In actual application, because the bristles tilt downstream C, the gap between the bristles will be further reduced under pressure difference, which can improve the sealing performance. It is suitable for low speed conditions, such as water or oil and other fluids with slow flow rates.

[0117] Example 10

[0118] The working principle and main structure of the brush-type sealing structure based on flexible brush filament breakage protection provided in this embodiment are the same as those in Embodiment 1. The structural difference between this embodiment and Embodiment 1 is as follows:

[0119] In embodiment 1, a threaded fastener 11 is included, and the front baffle 1, the rear baffle 2 and the rigid fastener 4 are fixedly connected by the threaded fastener 11.

[0120] After the rigid fastener 4 is fixedly connected to the front baffle 1 and the rear baffle 2 by the threaded fastener 11, the rigid fastener 4 squeezes the flexible fastener 5 to cause the flexible fastener 5 to shrink radially along the rotor, thereby applying a pre-tightening force to the brush bundle 3 between the fastening arc surface 52 and the supporting arc surface 61.

[0121] In Embodiment 1, the flexible fastener 5 is provided with a positioning part 51 and a fixing part 53 at the end away from the brush bundle 3, and the rigid fastener 4 is provided with a corresponding positioning groove 41 and a fixing groove 44. The positioning part 51 is placed in the positioning groove 41, which makes it convenient for installers to position the flexible fastener 5 and the rigid fastener 4 and assemble them together. The fixing part 53 is placed in the fixing groove 44 to improve the stability of the connection between the flexible fastener 5 and the rigid fastener 4.

[0122] In this embodiment, as Figure 13 As shown, it includes an elastic element 10, which is disposed between the rigid fastener 4 and the flexible fastener 5.

[0123] In this embodiment, as Figure 15 As shown, the flexible fastener 5 has a positioning part 51 at the end away from the brush filament bundle 3, such as... Figure 14 As shown, the rigid fastener 4 is provided with a corresponding positioning groove 41, and the positioning part 51 is placed in the positioning groove 41, which makes it convenient for installers to position the flexible fastener 5 and the rigid fastener 4 and assemble them together. The elastic element 10 is provided in the positioning groove 41 to abut against the positioning part 51.

[0124] The elastic force stored in the elastic element 10 replaces the rigid fastener 4 and is fixed by the threaded fastener 11, which then squeezes the flexible fastener 5 and applies a preload to the flexible fastener 5. When the rotor jumps too much, causing the brush bristles to bend radially, it will generate an impact force on the brush bristles. The elastic element 10 can absorb this impact force, thereby achieving the purpose of protecting the brush bristles.

[0125] Examples 2 to 9 can all adopt the approach of replacing the rigid fastener 4 with the elastic element 10 in this example, fixing it with the threaded fastener 11, and then squeezing the flexible fastener 5 to apply a preload to the flexible fastener 5 for structural improvement.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A brush-type sealing structure based on flexible bristle breakage protection, comprising a front baffle (1), a rear baffle (2), and a bristle bundle (3) composed of bristles, wherein one end of the bristle bundle (3) is close to the rotor, and the other end of the bristle bundle (3) is away from the rotor, and the end of the bristle bundle (3) away from the rotor is a fixed end, characterized in that, Also includes: Rigid fastener (4), flexible fastener (5) and flexible support pad (6); The front baffle (1) and the rear baffle (2) are fixedly connected by rigid fasteners (4). The front baffle (1), the rear baffle (2) and the rigid fasteners (4) form a fixed space. The flexible fasteners (5) and the flexible support pads (6) are installed in the fixed space. The flexible fastener (5) is provided with a fastening arc surface (52), and the flexible support pad (6) is provided with a support arc surface (61). The fastening arc surface (52) and the support arc surface (61) can clamp and fix the end of the brush filament bundle (3) away from the rotor. The support arc surface (61) protrudes outward from the flexible support pad (6), and the protrusion direction of the support arc surface (61) is away from the rotor. The fastening arc surface (52) is recessed inward from the flexible fastener (5), and the protrusion direction of the support arc surface (61) is the same as the recess direction of the fastening arc surface (52). The rigid fastener (4) can apply a preload force to the flexible fastener (5) along the rotor radial direction; It also includes a bristle retaining shell (8) and a bristle winding shaft (9); The bristle fixing shell (8) is used to accommodate the fixing end. The bristle fixing shell (8) is installed in the fixing space. The bristle winding shaft (9) is set inside the bristle fixing shell (8). The bristle winding shaft (9) cooperates with the bristle fixing shell (8) to clamp and fix the fixing end. The fixed end is wound around the brush filament winding shaft (9) and the end face of the fixed end abuts against the flexible support pad (6), and the brush filaments of the fixed end are welded together. It also includes threaded fasteners (11), the front baffle (1), the rear baffle (2) and the rigid fasteners (4) are fixedly connected by threaded fasteners (11); After the rigid fastener (4) is fixedly connected to the front baffle (1) and the rear baffle (2) by the threaded fastener (11), the rigid fastener (4) squeezes the flexible fastener (5) to make the flexible fastener (5) shrink radially along the rotor, thereby applying a preload force to the brush bundle (3) between the fastening arc surface (52) and the supporting arc surface (61).

2. The brush-type sealing structure based on flexible bristle breakage protection according to claim 1, characterized in that, The brush filament winding shaft (9) is located at the center of the fixed end, and the brush filaments at the fixed end are welded together with the brush filament winding shaft (9) at the contact point.

3. The brush-type sealing structure based on flexible bristle breakage protection according to claim 1, characterized in that, The end face of the fixed end abuts against the inner wall of the fixed space, and the brush bristles of the fixed end are welded together with the inner wall of the fixed space at the contact point.

4. The brush-type sealing structure based on flexible bristle breakage protection according to claim 1, characterized in that, The fixed end is fixed to the front baffle (1) and / or the rear baffle (2).

5. The brush-type sealing structure based on flexible bristle breakage protection according to claim 1, characterized in that, It also includes an elastic element (10) disposed between the rigid fastener (4) and the flexible fastener (5).

6. The brush-type sealing structure based on flexible bristle breakage protection according to claim 1, characterized in that, It also includes sealing rings, with sealing rings provided between the front baffle (1) and the rigid fastener (4) and between the rear baffle (2) and the rigid fastener (4).

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