Radial adjustable brush seal structure with thermal response regulation function

Abstract

The present application relates to the technical field of rotary machinery sealing, in particular to a radial adjustable brush seal structure with thermal response adjustment function, comprising: a plurality of arc-shaped sealing structures, the end faces of the plurality of arc-shaped sealing structures being connected to form a ring-shaped brush seal structure; wherein the arc-shaped sealing structure comprises: an arc-shaped sealing casing, an elastic support assembly and an axial limiting assembly. The present application can make the arc-shaped sealing block move adaptively in the guiding limiting assembly when the rotor has radial runout or temperature change, so as to adaptively adjust the sealing gap between the brush filament bundle and the rotor, thereby improving the sealing performance and the brush filament life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotary machinery sealing, in particular to a radial adjustable brush seal structure with thermal response adjustment function. BACKGROUND

[0002] Brush seal is widely used in high-temperature and high-speed rotating equipment such as aircraft engines, gas turbines and compressors due to its small friction loss, stable sealing performance and compact structure. However, during operation, the rotor will produce nonlinear runout behavior due to thermal expansion, machining error or load disturbance, which will cause the gap fluctuation between the brush wire and the rotor surface, and further cause the abnormal contact pressure of the brush wire bundle, aggravate the wear and even cause the sealing failure.

[0003] At present, the common brush seal is a fixed rigid structure, which cannot adapt to the dynamic changes of the rotor operating state, especially in the working condition of severe temperature fluctuation, the sealing gap change is uncontrollable. In addition, the brush wire bundle is usually arranged at an inclination angle, and the traditional coaxial seal segment arrangement cannot be compatible with the runout in all directions, resulting in a decrease in sealing capacity.

[0004] Therefore, it is necessary to provide a radial adjustable brush seal structure with thermal response adjustment function to solve the above problems. SUMMARY

[0005] In order to solve the problems of the common brush seal, such as the wear of the brush wire caused by the radial runout of the rotor, the decrease of the leakage performance, especially in the working condition of severe temperature fluctuation, the uncontrollable change of the sealing gap, etc., the present application provides a radial adjustable brush seal structure with thermal response adjustment function to solve the existing problems.

[0006] The radial adjustable brush seal structure with thermal response adjustment function of the present application adopts the following technical scheme, comprising:

[0007] A plurality of arc-shaped sealing structures are connected between the end faces of the plurality of arc-shaped sealing structures to form a ring-shaped brush seal structure;

[0008] The arc-shaped sealing structure comprises:

[0009] An arc-shaped sealing casing is provided with an arc-shaped sealing block connected to the inner arc surface through a guide limiting component; the guide limiting component is used to limit the movement of the arc-shaped sealing block in the radial direction and the position of the movement when the arc-shaped sealing block is stressed;

[0010] An elastic support component is used for resetting the arc-shaped sealing block and supporting the arc-shaped sealing block after resetting so that a first movable gap is formed between the outer arc surface of the arc-shaped sealing block and the inner arc surface of the arc-shaped sealing casing;

[0011] An arc-shaped brush wire fixing block is arranged in the inner circle of the arc-shaped sealing block;

[0012] And an axial limiting assembly for limiting axial movement of the arc-shaped sealing block.

[0013] Wherein, the end of the arc-shaped sealing block of the adjacent two arc-shaped sealing structures and the end of the arc-shaped sealing case of the adjacent two arc-shaped sealing structures are axially staggered and connected, and a second movable gap is left between the end faces of the arc-shaped sealing blocks of the adjacent two arc-shaped sealing structures.

[0014] The further technical scheme of the present application comprises:

[0015] A plurality of guide columns are uniformly arranged on the outer arc surface of the arc-shaped sealing block, and a first limiting protrusion is arranged on the side surface of the free end of the guide column.

[0016] And a plurality of guide grooves are uniformly arranged on the inner arc surface of the arc-shaped sealing case, and a second limiting protrusion is arranged on the side wall of the guide groove facing the arc-shaped sealing block.

[0017] Wherein, the guide column is radially slidably arranged in the corresponding guide groove, and the first limiting protrusion and the second limiting protrusion limit the moving position of the arc-shaped sealing block in the radial direction.

[0018] The further technical scheme of the present application comprises:

[0019] An elastic sheet is arranged on the outer arc surface of the arc-shaped sealing block between every two adjacent guide columns, one end of the elastic sheet is connected with the outer arc surface of the arc-shaped sealing block, and the other end of the elastic sheet is in contact with the inner arc surface of the arc-shaped sealing case.

[0020] And a tension spring is arranged in the mounting groove arranged on the guide column, one end of the tension spring is connected with the bottom surface of the mounting groove, and the other end of the tension spring is connected with the groove bottom surface of the guide groove of the inner arc surface of the arc-shaped sealing case.

[0021] The further technical scheme of the present application is that the elastic sheet is made of a shape memory alloy material.

[0022] The further technical scheme of the present application is that the shape of the elastic sheet is omega type, U type, semicircular shape, wave shape or crescent shape with a curved surface, wherein the curved surface of the elastic sheet is in contact with the inner arc surface of the arc-shaped sealing case, one of the two free ends on the side away from the curved surface of the elastic sheet is connected with the outer arc surface of the arc-shaped sealing block, and the other free end is slidably connected with the outer arc surface of the arc-shaped sealing block along the circumference of the outer arc surface.

[0023] The further technical scheme of the present application is that the inner arc surface of the arc-shaped sealing case is provided with a containing groove for containing the elastic sheet, wherein the groove bottom surface of the containing groove is in contact with the curved surface of the elastic sheet.

[0024] In a further technical solution of the present invention, the ends of two adjacent arc-shaped sealing housings in the annular brush sealing structure are staggered along the axial direction and fixed by screws to form an annular housing; the ends of adjacent arc-shaped sealing blocks in the annular brush sealing structure are staggered.

[0025] A further technical solution of the present invention includes an axial limiting component comprising a limiting ring component, which is disposed on the axial side of the arc-shaped sealing housing and the arc-shaped brush bristle fixing block.

[0026] A further technical solution of the present invention includes a limiting ring assembly comprising two axial fixing rings, wherein the axial fixing rings are disposed on the axial side of the annular brush seal structure, wherein the axial fixing rings are connected to the axial side of the arc-shaped sealing housing and the arc-shaped brush bristle fixing block, and the axial fixing rings are in contact with the axial surface of the arc-shaped sealing block.

[0027] The beneficial effects of this invention are:

[0028] 1. By dividing the annular sealing structure into multiple arc-shaped sealing structures, and by setting guide limiting components and elastic support components between the arc-shaped sealing housing and the arc-shaped sealing block of the arc-shaped sealing structure, when the rotor experiences radial runout or temperature changes, the arc-shaped sealing block can adaptively move with the guide limiting components to adjust the sealing gap between the brush bundle and the rotor, thereby improving sealing performance and brush life.

[0029] 2. By dividing the structure into multiple arc-shaped sealing segments, the arc-shaped brush bristle fixing blocks are arranged alternately, that is, the brush bristle bundles are arranged alternately to achieve omnidirectional jumping, thereby providing sealing capability. Attached Figure Description

[0030] 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a radially adjustable brush seal structure with thermal response adjustment function according to the present invention.

[0032] Figure 2 for Figure 1 A schematic diagram of the structure after removing the first and second axial fixing rings;

[0033] Figure 3 for Figure 2 A schematic diagram of a single arc-shaped sealing structure;

[0034] Figure 4 forFigure 2 A schematic view of the connection between two adjacent arc-shaped sealing structures;

[0035] Figure 5 A schematic view of the connection between two adjacent arc-shaped sealing structures; Figure 1 A schematic view of the connection between two adjacent arc-shaped sealing structures;

[0036] Figure 6 A schematic view of the connection between two adjacent arc-shaped sealing structures; Figure 5 A top view of the present application;

[0037] Figure 7 A schematic view of the structure of the composite multi-temperature zone response elastic sheet used in the embodiment of the present application.

[0038] In the figure: 1, arc-shaped sealing structure; 2, arc-shaped sealing case; 3, tension spring; 4, fixing screw; 5, elastic sheet; 6, arc-shaped sealing block; 7, arc-shaped brush wire fixing block; 8, guide column; 9, first axial fixing ring; 10, second axial fixing ring; 21, second limiting protrusion; 51, guide slot; 61, limiting column; 81, first limiting protrusion; 82, mounting slot. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0040] An embodiment of the radial adjustable brush seal structure with thermal response adjustment function of the present application is shown in Figure 1 and Figure 2 , which comprises a plurality of arc-shaped sealing structures 1, and the end faces of the plurality of arc-shaped sealing structures 1 are connected to form a ring-shaped brush seal structure. As shown in Figure 2 , Figure 3 , Figure 4 and Figure 5 , the arc-shaped sealing structure 1 comprises an arc-shaped sealing case 2, an elastic support assembly, and an axial limiting assembly. The inner arc surface of the arc-shaped sealing case 2 is slidably connected with an arc-shaped sealing block 6 through a guide limiting piece. The guide limiting assembly is used to limit the movement and position of the arc-shaped sealing block 6 when the arc-shaped sealing block 6 is stressed. The elastic support assembly is used for the reset of the arc-shaped sealing block 6, and supports the arc-shaped sealing block 6 after reset so that a first movable gap is formed between the outer arc surface of the arc-shaped sealing block 6 and the inner arc surface of the arc-shaped sealing case 2. The inner circle of the arc-shaped sealing block 6 is provided with an arc-shaped brush wire fixing block 7, and the axial limiting assembly is used to limit the axial movement of the arc-shaped sealing block 6. As shown in Figure 3As shown in the figure, the end of the arc-shaped sealing block 6 of the two adjacent arc-shaped sealing structures 1 and the end of the arc-shaped sealing case 2 of the two adjacent arc-shaped sealing structures 1 are axially staggered and connected, and a second movable gap is left between the end faces of the arc-shaped sealing block 6 of the two adjacent arc-shaped sealing structures 1. It should be noted that, as shown in the figure, Figure 1 As shown in the figure, in this embodiment, the angle corresponding to the arc surface of the arc-shaped sealing block 6 is 60°, that is, the end faces of the six arc-shaped sealing blocks 6 are staggered and spliced to form a complete annular sealing member.

[0041] As shown in the figure, Figure 2 and Figure 3 As shown in the figure, in one specific embodiment, the guide limiting component includes two one-to-one corresponding guide columns 8 and guide grooves. The two guide columns 8 are uniformly arranged on the outer arc surface of the arc-shaped sealing block 6, and the side surface of the free end of the guide column 8 is provided with a first limiting protrusion 81. The two guide grooves are uniformly arranged on the inner arc surface of the arc-shaped sealing case 2, and the side wall of the guide groove towards the side of the arc-shaped sealing block 6 is provided with a second limiting protrusion 21. The guide column 8 is radially slidably arranged in the corresponding guide groove, and the first limiting protrusion 81 and the second limiting protrusion 21 limit the position of the arc-shaped sealing block 6 in the radial direction. That is, when the rotor has radial runout or temperature changes, the arc-shaped sealing block 6 is forced to move in the radial direction under the guidance and limitation of the guide limiting component. At this time, due to the limitation of the first limiting protrusion 81 and the second limiting protrusion 21, the arc-shaped sealing block 6 can only move a certain distance in the radial direction.

[0042] As shown in the figure, Figure 2 As shown in the figure, in one specific embodiment, the elastic reset component includes an elastic sheet 5 and a tension spring 3. The elastic sheet 5 is arranged on the outer arc surface of the arc-shaped sealing block 6 between every two adjacent guide columns 8. One end of the elastic sheet 5 is connected with the outer arc surface of the arc-shaped sealing block 6, and the other end of the elastic sheet 5 is in contact with the inner arc surface of the arc-shaped sealing case 2. The tension spring 3 is arranged in the mounting groove 82 of the guide column 8. One end of the tension spring 3 is connected with the bottom surface of the mounting groove 82, and the other end of the tension spring 3 is connected with the groove bottom surface of the guide groove of the inner arc surface of the arc-shaped sealing case 2. Specifically, the elastic sheet 5 is made of a shape memory alloy material, and the shape of the elastic sheet 5 is Ω-shaped, U-shaped, semi-arc-shaped, wavy-shaped or crescent-shaped with a curved surface. The curved surface of the elastic sheet 5 is in contact with the inner arc surface of the arc-shaped sealing case 2, and the side away from the curved surface of the elastic sheet 5 has two free ends. One of the free ends is connected with the outer arc surface of the arc-shaped sealing block 5, and the other free end is slidably connected with the outer arc surface of the arc-shaped sealing block 5 along the circumferential direction of the outer arc surface. The inner arc surface of the arc-shaped sealing case 2 is provided with a containing groove for containing the elastic sheet 5. The groove bottom surface of the containing groove is in contact with the curved surface of the elastic sheet 5. Figure 2As shown, in the present embodiment, the elastic sheet 5 is in the shape of an Ω with a curved surface, and the free end of the Ω-shaped elastic sheet 5 away from the side of the curved surface is provided with two connecting ears, one of which is fixed by a fixing screw 4 and the outer arc surface of the arc-shaped sealing block 6, and the other of which is provided with a guide slot 51, and a limiting column 61 is arranged on the outer arc surface of the arc-shaped sealing block 6, which is slidingly connected in the guide slot 51. It should be noted that the tension spring 3 is initially in a pre-tensioned state, and in the present embodiment, two tension springs 3 are arranged on both sides of the Ω-shaped elastic sheet 5 to provide a return traction force and cooperate with the Ω-shaped elastic sheet 5 to achieve bidirectional adjustment of the arc-shaped sealing block 6. When the rotor has radial runout or temperature changes, the arc-shaped sealing block 6 moves radially under the guidance and limitation of the guide and limiting assembly, and the Ω-shaped elastic sheet 5 deforms under the limitation of the guide structure formed by the guide slot 51 and the limiting column 61 on the connecting ear piece. In order to adapt to temperature changes in multiple working conditions, the elastic sheet 5 adopts a composite multi-temperature zone response elastic sheet, such as Figure 7 As shown, the Ω-shaped elastic sheet 5 in the present embodiment is divided into three functional areas in the circumferential direction, and material 1: nickel-titanium shape memory alloy is used in the central area, which has a phase transition temperature interval of austenite starting temperature 70-78°C and austenite ending temperature 78-85°C after solid solution and aging treatment, and when the environmental temperature rises to 80°C, the phase transition is completed to output a small stroke, achieving pre-tightening fine adjustment; material 2: nickel-titanium hafnium high-temperature shape memory alloy is used in the two side areas, which has a phase transition temperature interval of austenite starting temperature 135-145°C and austenite ending temperature 145-160°C, and when the temperature rises to 150°C, the phase transition is completed to output a large stroke, achieving high-temperature compensation. The composite multi-temperature zone response elastic sheet has differentiated restoring mechanical behavior in different temperature zones, achieving self-adaptive response and continuous adjustment to high-temperature and low-temperature working conditions. That is, in the present embodiment, the Ω-shaped elastic sheet 5 is in an elastic state when the activation temperature is not reached, and the Ω-shaped elastic sheet 5 is used to buffer the offset of the arc-shaped brush wire fixing block 7 caused by rotor runout, thereby reducing the impact load of the brush wire bundle on the rotor, and avoiding damage to the bristles of the brush wire bundle. When the temperature rises above the austenite transition temperature of the corresponding memory alloy of the Ω-shaped elastic sheet 5, the bending amplitude of the Ω-shaped elastic sheet 5 decreases, driving the arc-shaped sealing block 6 to move outward in the radial direction under the traction of the tension spring 3; when the temperature drops to the martensite transition temperature zone of the corresponding memory alloy of the Ω-shaped elastic sheet 5, the Ω-shaped elastic sheet 5 returns to the initial arched shape, and the arc-shaped sealing block 6 is returned to the initial sealing gap position by the arc-shaped sealing block 6, achieving closed-loop control of thermal response adjustment.

[0043] Exemplary, in one specific embodiment, the end of two adjacent arc-shaped sealing blocks 6 in the annular brush seal structure are staggered butted in the axial direction and fixed by screws to form an annular sealing block; the end of two adjacent arc-shaped sealing blocks 6 in the annular brush seal structure are staggered butted, and a second movable gap is left between the butted end faces of the two adjacent arc-shaped sealing blocks 6, i.e. when the rotor has radial jump or temperature change, the arc-shaped sealing block 6 moves radially under the guidance and limitation of the guiding and limiting assembly, and the second movable gap is to ensure the movable gap when the two adjacent arc-shaped sealing blocks 6 move radially outward.

[0044] Exemplary, in one specific embodiment, the axial limiting assembly comprises a limiting ring assembly, which is arranged on the axial side of the arc-shaped sealing block 2 and the arc-shaped brush wire fixed block 7. Specifically, as shown in Figure 4 、 Figure 5 and Figure 6 , the limiting ring assembly comprises two axial fixed rings, i.e. a first axial fixed ring 9 and a second axial fixed ring 10. The first axial fixed ring 9 is arranged on the upstream axial side of the annular brush seal structure, and the second axial fixed ring 10 is arranged on the downstream axial side of the annular brush seal structure. The axial fixed ring is connected with the corresponding axial side of the arc-shaped sealing block 2 and the arc-shaped brush wire fixed block 7, and the axial fixed ring is in contact with the axial surface of the arc-shaped sealing block 6. It should be noted that the limiting ring assembly is used to limit the displacement of the arc-shaped sealing block 6 in the axial direction, prevent the sealing failure of the arc-shaped sealing block 6 and reduce the leakage.

[0045] I. Working principle of the radial adjustable brush seal structure:

[0046] During the operation of the aero-engine, when the rotor of the aero-engine has radial runout (for example, the radial runout of the rotor caused by manufacturing errors, uneven thermal expansion or load disturbance), the radial runout of the rotor will cause local changes in the contact gap between the brush bundle and the rotor. At this time, the Ω-shaped elastic sheet 5 between the arc-shaped sealing block 6 on the outer arc side of the arc-shaped brush bundle fixing block 7 of the brush bundle and the arc-shaped sealing casing 2 still has good elastic performance in the low-temperature inactive state (that is, the low temperature is ≤ 70℃, and the corresponding alloy martensite starts to transform into austenite at a temperature As≈75±5℃, and the martensite is completely transformed into austenite at a temperature Af≈80±5℃), that is, only good elasticity is exhibited without shape memory recovery deformation; when the temperature rises to the high-temperature active state (for example, the temperature T ≥ 85℃, and the corresponding martensite is completely transformed into austenite at a temperature Af≈80±5℃), the elastic sheet has a recovery deformation of the shape memory effect to drive the adaptive adjustment of the sealing gap. (Of course, different materials have different martensite and austenite temperatures, and the parameters of the material can be determined according to the actual working conditions), the Ω-shaped elastic sheet 5 can produce a compliant response to the arc-shaped sealing block 6, that is, a compliant response to the arc-shaped brush bundle fixing block 7 to form a compliant type buffering mechanism. Specifically, when the brush bundle of the arc-shaped brush bundle fixing block 7 is pushed to produce a slight (0.1mm-0.5mm) radial displacement of the arc-shaped sealing block 6 (or other sealing ring) by the outward movement of the rotor, the Ω-shaped elastic sheet 5 has a reversible deformation, and the Ω-shaped elastic sheet 5 provides a non-rigid support and buffering, effectively preventing the brush bundle from being extruded and broken due to the runout, thereby improving the reliability of the brush seal structure and the service life of the brush. It is worth noting that the brush bundle is usually installed at a certain inclination angle (such as 40°), and therefore, in the traditional structure, the brush seal section is arranged symmetrically along the same axial plane, which cannot fully adapt to the full-direction runout. Therefore, the arc-shaped sealing block 6 is arranged in an axial staggered manner in the embodiment, so that the arc-shaped brush bundle fixing block 7 on the arc-shaped sealing block 6 is also staggered, that is, the two adjacent arc-shaped sealing blocks 6 are staggered by a certain distance in the axial direction (axial offset), but part of the radial overlap area is retained, so that better compliance is achieved under the premise of maintaining sealing coverage, forming an "interlaced multi-zone composite sealing structure". In addition, in order to limit the axial movement of the sealing ring, the end faces of the two adjacent arc-shaped sealing blocks 6 are inserted, that is, as shown in Figure 3 , the end face of one arc-shaped sealing block 6 is inserted, and the end face of the other arc-shaped sealing block 6 is an insertion block, the insertion block is inserted into the insertion slot to form a concave limiting slot structure, preventing the arc-shaped sealing block 6 from moving axially; two axial fixing rings constrain the arc-shaped sealing block 6 in the axial direction to avoid axial staggering and further reduce the leakage channel; two adjacent arc-shaped sealing casings 2 are assembled by screw fastening to ensure the rigidity and integrity of the overall structure.

[0047] II. Heat response mechanism radial gap adaptive adjustment principle:

[0048] During the operation of the aero-engine, as the rotating speed of the aero-engine increases or the working condition continues to load, the temperature of the rotor surface gradually rises, and a significant radial thermal expansion effect is generated. At this time, if the sealing gap cannot be adjusted in real time, excessive contact or even interference between the brush wire and the rotor surface will be caused, which will lead to rapid wear, fracture or even failure of the brush wire, and seriously affect the sealing life and the safety of the whole machine. In view of the above problems, the Ω-shaped elastic sheet 5 made of a shape memory alloy material with a thermal response capability is arranged between the outer arc surface of each arc-shaped sealing block 6 and the inner arc surface of the corresponding arc-shaped sealing casing 2. When the temperature rises, the Ω-shaped elastic sheet 5 is activated by heat and gradually recovers to its “memory shape”, that is, the bending amplitude gradually decreases, and the overall presents a “lying down” state, the middle arch part descends and pushes the arc-shaped brush wire fixing block 7 to move radially outward. However, since the Ω-shaped elastic sheet 5 is unidirectional deformation and one end is fixed, the restoring force has directionality and limitation, therefore, two tension springs 3 are also designed between the outer arc surface of each arc-shaped sealing block 6 and the inner arc surface of the corresponding arc-shaped sealing casing 2 in the embodiment. The two tension springs 3 are in a pre-tension state in the initial state, that is, there is a certain internal tension. When the Ω-shaped elastic sheet 5 “lies down” due to temperature rise, its active deformation releases part of the support force, at the same time, releases space for the tension spring 3, and the tension spring 3 drives the arc-shaped brush wire fixing block 7 and the single arc-shaped sealing block 6 to move radially outward by means of its restoring force, so as to actively expand the gap between the brush wire bundle and the rotor surface, and effectively avoid the risk of interference and wear under high temperature working condition. After the aero-engine cools down, the temperature returns to below the normal temperature state, and the shape memory alloy material of the Ω-shaped elastic sheet 5 gradually recovers to the original deformation state, that is, from “lying shape” to the original Ω shape, the middle arch rises upward, and applies a reverse thrust to the tension spring 3 and the arc-shaped sealing block 6. At this time, under the action of the rigid restoring force of the Ω-shaped elastic sheet 5, the arc-shaped sealing block 6 ring returns to the initial fitting position along the radial direction, and returns to the sealing contact state under the low temperature state.

[0049] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A radial-adjustable brush seal structure having a heat-responsive adjustment function, characterized by, The application relates to a ring-shaped brush seal structure. The arc-shaped sealing structure comprises: An arc-shaped sealing block is slidably connected to the inner arc surface of the arc-shaped sealing casing through a guide limiting component; the guide limiting component is used for limiting the movement and position of the arc-shaped sealing block in the radial direction when the arc-shaped sealing block is stressed; An elastic supporting component is used for resetting the arc-shaped sealing block and supporting the arc-shaped sealing block after resetting so that a first movable gap is formed between the outer arc surface of the arc-shaped sealing block and the inner arc surface of the arc-shaped sealing casing; An arc-shaped brush wire fixing block is arranged on the inner circle of the arc-shaped sealing block; And an axial limiting component is used for limiting the axial movement of the arc-shaped sealing block. The end portions of the arc-shaped sealing blocks of two adjacent arc-shaped sealing structures in the ring-shaped brush seal structure are arranged and connected in an axial staggered mode, the end portions of the arc-shaped sealing casings of the two adjacent arc-shaped sealing structures are arranged and connected in an axial staggered mode, and a second movable gap is left between the end faces of the arc-shaped sealing blocks of the two adjacent arc-shaped sealing structures. The guide limiting component comprises:

2. The radial-adjustable brush seal structure with thermal response adjustment function according to claim 1, characterized in that, A plurality of guide columns are uniformly arranged on the outer arc surface of the arc-shaped sealing block, and a first limiting protrusion is arranged on the side surface of the free end of the guide column; A plurality of guide grooves are uniformly arranged on the inner arc surface of the arc-shaped sealing casing, and a second limiting protrusion is arranged on the side wall of the guide groove on the side of the arc-shaped sealing block; The guide column is slidably arranged in the corresponding guide groove in the radial direction, and the first limiting protrusion and the second limiting protrusion limit the position of the arc-shaped sealing block in the radial direction. The elastic resetting component comprises:

3. The radial adjustable brush seal structure with thermal responsive adjustment function according to claim 2, characterized in that, An elastic sheet is arranged on the outer arc surface of the arc-shaped sealing block between every two adjacent guide columns, one end of the elastic sheet is connected to the outer arc surface of the arc-shaped sealing block, and the other end of the elastic sheet is in contact with the inner arc surface of the arc-shaped sealing casing; And a tension spring is arranged in a mounting groove arranged on the guide column, one end of the tension spring is connected to the bottom surface of the mounting groove, and the other end of the tension spring is connected to the groove bottom surface of the guide groove of the inner arc surface of the arc-shaped sealing casing. The elastic sheet is made of a shape memory alloy material.

4. The radial-adjustable brush seal structure with thermal response adjustment function according to claim 3, characterized in that, The shape of the elastic sheet is omega-shaped, U-shaped, semicircular, wavy or meniscus-shaped, wherein the curved surface of the elastic sheet is in contact with the inner arc surface of the arc-shaped sealing casing, one of the two free ends on the side away from the curved surface of the elastic sheet is connected to the outer arc surface of the arc-shaped sealing block, and the other free end is slidably connected to the outer arc surface of the arc-shaped sealing block along the circumference of the outer arc surface.

5. The radial adjustable brush seal structure with thermal responsive adjustment function according to claim 3, wherein, The inner arc surface of the arc-shaped sealing casing is provided with a containing groove for containing the elastic sheet, and the groove bottom surface of the containing groove is in contact with the curved surface of the elastic sheet.

6. The radial adjustable brush seal structure with thermal responsive adjustment function according to claim 5, wherein, The end portions of the two adjacent arc-shaped sealing casings in the ring-shaped brush seal structure are axially staggered and abutted, and are fixed by screws to form a ring-shaped casing; the end portions of the two adjacent arc-shaped sealing blocks in the ring-shaped brush seal structure are axially staggered and abutted.

7. The radial adjustable brush seal structure with thermal responsive adjustment function according to claim 1, wherein, The axial limiting component comprises a limiting ring component arranged on the axial side of the arc-shaped sealing casing and the arc-shaped brush wire fixing block.

8. The radial adjustable brush seal structure with thermal responsive adjustment function according to claim 1, wherein, The limiting ring component comprises two axial fixing rings arranged on the axial side of the ring-shaped brush seal structure, wherein the axial fixing ring is connected to the corresponding axial side of the arc-shaped sealing casing and the arc-shaped brush wire fixing block, and the axial fixing ring is in contact with the axial surface of the arc-shaped sealing block.

9. The radial adjustable brush seal structure with thermal responsive adjustment function according to claim 8, wherein, ​

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