Sealing mechanism

Abstract

The utility model provides a sealing mechanism which is arranged in a sealing flow channel of a shield tunneling machine and comprises a first sealing structure and a second sealing structure, the first sealing structure and the second sealing structure are arranged in the axial direction of the sealing flow channel, and the first sealing structure is arranged close to the inlet side of the sealing flow channel; the first sealing structure is provided with a first fixed end and a first movable end, the second sealing structure is provided with a second fixed end and a second movable end, and the first fixed end and the second fixed end are used for being connected with one of the inner side wall and the outer side wall of the sealing flow channel. The first movable end and the second movable end are used for abutting against the other one of the inner side wall and the outer side wall of the sealing flow channel in a sealed mode, and at least part of the first sealing structure inclines towards the inlet side of the sealing flow channel from the first fixed end to the first movable end. The main drive labyrinth sealing device solves the problem that the working efficiency of a shield tunneling machine is reduced due to the fact that the main drive labyrinth sealing device is poor in slag stone blocking effect and the shield tunneling machine is shut down for maintenance.

Description

Technical Field

[0001] The utility model relates to the technical field of main drive sealing of shield machines, in particular to a sealing mechanism. Background Art

[0002] The description in this section merely provides background information related to the disclosure of the present utility model and does not constitute prior art.

[0003] In the field of shield machine main drive sealing technology, the shield machine main drive generally adopts a lip seal mechanism for sealing. However, in actual operation, the lip seal of the main drive often fails, and the machine needs to be shut down at any time to replace the lip seal. The failure of the lip seal is mainly due to the entry of a large amount of slag into the sealing cavity, which causes the lip seal to be worn by a large amount of slag, resulting in failure too quickly. The front end of the existing lip seal is usually set as a labyrinth seal, which blocks the entry of slag through a bent sealing mechanism. However, in practice, the labyrinth seal can block the entry of larger slag, but the blocking effect on small particles of slag is poor.

[0004] In response to the above problems, a slag blocking device is generally installed at the outlet of the labyrinth seal to protect the main drive seal from entering the slag. However, the slag blocking device is exposed to the outside and is easily hit by the falling slag during the operation of the shield machine, resulting in damage to the slag blocking device. It also causes the shield machine to be frequently shut down for replacement, failing to improve the working efficiency of the shield machine. In addition, some sealing mechanisms are installed in the main drive seal of the shield machine, such as end face finger seals, etc. These sealing structures are prone to generate a large amount of heat energy at high linear speeds, have high heat generation, cannot be used for a long time in the labyrinth seal, and occupy a large space, and cannot be installed in the flow channel of the labyrinth seal. In addition, multiple lip seals or other types of seals are added to the main drive sealing structure, but a simple superimposed sealing mechanism will increase the overall size of the main drive and the number of assembled structural parts. Although the redundancy is high and the shutdown maintenance cycle of the shield machine is extended, more seals need to be uninstalled, replaced and installed each time for maintenance. Affected by the structure, it is more difficult to clean the slag, further increasing the maintenance workload and affecting the working efficiency of the shield machine.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the utility model and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the utility model. Utility Model Content

[0006] The utility model aims to provide a sealing mechanism, which solves the problem that the main drive labyrinth seal has a poor effect in blocking slag and stone, causing the shield machine to be shut down for maintenance and reducing the working efficiency of the shield machine.

[0007] The above-mentioned implementation purpose of the utility model is mainly achieved by the following technical solutions:

[0008] The utility model provides a sealing mechanism, which is arranged in a sealing flow channel of a shield machine, and the sealing mechanism comprises: a first sealing structure and a second sealing structure arranged along the circumference of the sealing flow channel, the first sealing structure and the second sealing structure are arranged along the axial direction of the sealing flow channel, and the first sealing structure is arranged closer to the inlet side of the sealing flow channel than the second sealing structure;

[0009] The first sealing structure has a first fixed end and a first movable end, the first fixed end is used to connect with one of the inner side wall and the outer side wall of the sealing flow channel, and the first movable end is used to seal against the other of the inner side wall and the outer side wall of the sealing flow channel;

[0010] The second sealing structure has a second fixed end and a second movable end, the second fixed end is used to be connected to one of the inner side wall and the outer side wall of the sealing flow channel, and the second movable end is used to seal against the other of the inner side wall and the outer side wall of the sealing flow channel;

[0011] At least a portion of the first sealing structure is inclined toward the inlet side of the sealing flow channel from the first fixed end to the first movable end.

[0012] In a specific embodiment, the first sealing structure has a plurality of first sealing members arranged along the circumference of the sealing flow channel, and the second sealing structure has a plurality of second sealing members arranged along the circumference of the sealing flow channel;

[0013] Each of the first sealing members has a third fixed end and a third movable end, and each of the second sealing members has a fourth fixed end and a fourth movable end;

[0014] The third fixed ends of the plurality of first sealing members cooperate along the circumference of the sealing flow channel to form the first fixed end, and the third movable ends of the plurality of first sealing members cooperate along the circumference of the sealing flow channel to form the first movable end;

[0015] The fourth fixed ends of the plurality of second seals cooperate along the circumference of the sealing flow channel to form the second fixed ends, and the third movable ends of the plurality of second seals cooperate along the circumference of the sealing flow channel to form the first movable ends.

[0016] In a specific embodiment, the third fixed ends of the plurality of first seals and the fourth fixed ends of the plurality of second seals are connected to the outer side wall of the sealing flow channel, and the third movable ends of the plurality of first seals and the fourth movable ends of the plurality of second seals are abutted against the inner side wall of the sealing flow channel.

[0017] In a specific embodiment, the first sealing member has a plurality of arcuate brush bundles arranged along the circumference of the sealing flow channel, both ends of each arcuate brush bundle are connected to the outer side wall of the sealing flow channel along the circumference of the sealing flow channel, and the bending portion of each arcuate brush bundle is against the inner side wall of the sealing flow channel.

[0018] In a specific embodiment, a plurality of the arcuate brush filament bundles are continuously arranged along the circumference of the sealed flow channel, or each of the arcuate brush filament bundles is partially staggered and overlapped with its adjacent arcuate brush filament bundles.

[0019] In a specific embodiment, the first seal further comprises a front baffle and a rear baffle which are arranged at intervals along the axial direction of the sealing flow channel, the front baffle and the rear baffle form a third fixed end of the first seal, and the front baffle is closer to the inlet side than the rear baffle.

[0020] Part of the bow-shaped brush bundle is clamped between the front baffle and the rear baffle, and in the radial direction of the sealed flow channel, the thickness of the front baffle is smaller than the thickness of the rear baffle.

[0021] In a specific embodiment, the first sealing member further comprises a clamping plate, which is arranged between the front baffle plate and the rear baffle plate, one end of the clamping plate is connected to the outer side wall of the sealing flow channel, and both ends of the plurality of bow-shaped brush bundles are clamped at the other end of the clamping plate.

[0022] In a specific embodiment, the first sealing member further comprises a radial block with adjustable height, and the radial block is connected between the clamping plate and the outer side wall of the sealing flow channel.

[0023] In a specific embodiment, part of the arched brush filament bundle is inclined toward the inlet side of the sealed flow channel from the third fixed end to the third movable end, and the angle between the arched brush filament bundle and the radial direction of the sealed flow channel is greater than or equal to 30°, and / or the angle is less than or equal to 45°.

[0024] In a specific embodiment, the second sealing member has a brush bundle arranged along the circumference of the sealing flow channel, the brush bundle is composed of multiple brush filaments, one end of the multiple brush filaments are tightly bound to form a tight end of the brush bundle, the tight end is connected to the outer side wall of the sealing flow channel, and the other end of the multiple brush filaments abuts against the inner side wall of the sealing flow channel.

[0025] In a specific embodiment, the brush bundle has an opening angle from the tightening hoop end toward the inner side wall of the sealing flow channel.

[0026] In a specific embodiment, the opening angle of the brush filament bundle is 4° to 8°.

[0027] In a specific embodiment, the second seal also has a front clamping plate and a rear clamping plate arranged at an axial interval along the sealing flow channel, the front clamping plate and the rear clamping plate form a fourth fixed end of the second seal, the front clamping plate is arranged closer to the inlet side than the rear clamping plate, and part of the brush bundle is clamped between the front baffle plate and the rear baffle plate.

[0028] In a specific embodiment, the arcuate brush filament bundle is composed of a plurality of the brush filaments, and the brush filaments of the arcuate brush filament bundle and the brush filaments of the brush filament bundle are made of aramid fiber material or polytetrafluoroethylene material.

[0029] In a specific embodiment, in the bow-shaped brush filament bundle or the brush filament bundle, the number of brush filaments made of aramid fiber material and the number of brush filaments made of polytetrafluoroethylene material are 1:1.

[0030] In a specific implementation, the splint is made of polyurethane rubber material.

[0031] In a specific embodiment, along the circumference of the sealed flow channel, the density of the brush filaments of the brush filament bundle is 1000 filaments / mm to 3000 filaments / mm.

[0032] In a specific embodiment, along the circumference of the sealed flow channel, the density of the arched brush filament bundles is 200 bundles / m to 400 bundles / m.

[0033] In a specific embodiment, the density of the brush filaments in each of the arched brush filament bundles is 6000 to 12000 filaments per bundle.

[0034] In a specific embodiment, the outer surface of the brush filament is covered with a coating, and the coating is formed by coating with an oleophobic material.

[0035] Compared with the prior art, the technical solution described in the utility model has the following characteristics and advantages:

[0036] 1. The utility model prevents the entry of slag into the labyrinth seal of the main drive of the shield machine by connecting the first sealing structure and the second sealing structure in series in the sealing flow channel in this embodiment, so as to prevent the slag from moving from the entrance of the sealing flow channel of the labyrinth seal of the main drive to the exit of the sealing flow channel of the labyrinth seal and entering the sealing slideway where the lip seal is placed.

[0037] 2. The utility model tilts at least a portion of the first sealing structure so that a large amount of debris entering from the entrance of the sealing flow channel can move along the slope of the first sealing structure and accumulate on the slope of the first sealing structure. The extrusion force provided by the debris on the first sealing structure can be converted into pressure for pressing the first movable end of the first sealing structure against the side wall of the sealing flow channel and a pulling force on the first fixed end of the first sealing structure. On the basis that the first fixed end of the first sealing structure is fixedly connected to the side wall of the sealing flow channel, that is, the debris accumulated on the slope of the first sealing structure can make the sealing effect of the first sealing structure better.

[0038] 3. By setting the inclination of the first sealing structure and the second sealing structure, the first sealing structure and the second sealing structure can form different sealing function zones respectively. The first sealing structure inclined from the first fixed end to the first movable end toward the inlet side of the sealing flow channel can carry more slag, thereby avoiding the risk of rapid failure of the inlet side close to the sealing flow channel due to the influence of a large amount of slag;

[0039] At the same time, the first sealing structure can leak some smaller slag and stone to the second sealing structure, which will be intercepted by the second sealing structure, avoiding the first sealing structure being affected by all the slag and stone accumulation, resulting in the first sealing structure failing and the second sealing structure not intercepting the slag and stone. The first sealing structure and the second sealing structure share the burden evenly, extending the service life of the first sealing structure and the second sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a structural diagram of a first embodiment of the sealing mechanism of the utility model;

[0041] Figure 2 This is a structural diagram of a second embodiment of the sealing mechanism of the utility model;

[0042] Figure 3 It is a cross-sectional view of the sealing mechanism of the utility model;

[0043] Figure 4 This is a structural diagram of the bow-shaped brush bundle of the sealing mechanism of the utility model.

[0044] Description of Figure Numbers:

[0045] 1. Sealing flow channel; 11. Inner wall; 12. Outer wall;

[0046] 2. First sealing structure; 21. First sealing member; 211. Arched brush bundle; 2111. Both ends of the arched brush bundle; 2112. Bending portion of the arched brush bundle; 212. Front baffle; 213. Rear baffle; 214. Clamp; 215. Radial block; 201. First fixed end; 202. First movable end; 2011. Third fixed end; 2021. Third movable end;

[0047] 3. Second sealing structure; 31. Second sealing member; 311. Brush bundle; 3111. Tightening end of brush bundle; 312. Front clamping plate; 313. Rear clamping plate; 301. Second fixed end; 302. Second movable end; 3011. Fourth fixed end; 3021. Fourth movable end;

[0048] 4. Entrance side;

[0049] F. Axial direction of the sealing flow channel;

[0050] H, radial direction of the sealing flow channel;

[0051] A. The angle between the arched brush bundle and the radial direction of the sealing flow channel;

[0052] B. Opening angle. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0054] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0056] like Figure 1 and Figure 2As shown, the utility model provides a sealing mechanism, which is arranged in a sealing flow channel 1 of a shield machine, and the sealing mechanism comprises: a first sealing structure 2 and a second sealing structure 3 arranged along the circumference of the sealing flow channel 1, the first sealing structure 2 and the second sealing structure 3 are arranged along the axial direction F of the sealing flow channel 1, and the first sealing structure 2 is arranged closer to the inlet side 4 of the sealing flow channel 1 than the second sealing structure 3;

[0057] The first sealing structure 2 has a first fixed end 201 and a first movable end 202, wherein the first fixed end 201 is used to be connected to one of the inner wall 11 and the outer wall 12 of the sealing flow channel 1, and the first movable end 202 is used to be sealed against the other of the inner wall 11 and the outer wall 12 of the sealing flow channel 1;

[0058] The second sealing structure 3 has a second fixed end 301 and a second movable end 302, wherein the second fixed end 301 is used to be connected to one of the inner wall 11 and the outer wall 12 of the sealing flow channel 1, and the second movable end 302 is used to be sealed against the other of the inner wall 11 and the outer wall 12 of the sealing flow channel 1;

[0059] At least a portion of the first sealing structure 2 is inclined toward the inlet side 4 of the sealing flow channel 1 from the first fixed end 201 to the first movable end 202 .

[0060] The sealing mechanism provided by the utility model, through the first sealing structure 2 and the second sealing structure 3 which are arranged in series in the sealing flow channel 1, blocks the entry of slag into the labyrinth seal of the main drive of the shield machine in this embodiment, and prevents the slag from moving from the entrance of the sealing flow channel 1 of the labyrinth seal of the main drive to the exit of the sealing flow channel 1 of the labyrinth seal and entering the sealing slideway where the lip seal is placed. In other embodiments, the sealing mechanism provided by the utility model can also be used in the sealing flow channel 1 between the stator and the rotor, without limitation.

[0061] Specifically in the present embodiment, the inlet side 4 of the sealing flow channel 1 is close to the inlet of the shield machine slag bin, and the first sealing structure 2 and the second sealing structure 3 of the sealing mechanism provided by the utility model are arranged front and back along the axial direction F of the sealing flow channel 1, wherein the first sealing structure 2 is arranged closer to the inlet side 4 of the sealing flow channel 1 than the second sealing structure 3, so the first sealing structure 2 mainly undertakes the role of the first filtering, and the second sealing structure 3 undertakes the role of the second filtering.

[0062] In the present embodiment, the first fixed end 201 of the first sealing structure 2 is connected to one of the inner wall 11 and the outer wall 12 of the sealing flow channel 1, and the first movable end 202 is sealingly abutted against the other of the inner wall 11 and the outer wall 12 of the sealing flow channel 1, so that the first sealing structure 2 can seal the sealing flow channel 1 while ensuring that the driven rotor can rotate relative to the driven stator; the second fixed end 301 of the second sealing structure 3 in the present embodiment is connected to one of the inner wall 11 and the outer wall 12 of the sealing flow channel 1, and the second movable end 302 is sealingly abutted against the other of the inner wall 11 and the outer wall 12 of the sealing flow channel 1, so that the second sealing structure 3 can seal the sealing flow channel 1 while ensuring that the main driven rotor can rotate relative to the driven stator.

[0063] In this embodiment, the first sealing structure 2 and the second sealing structure 3 are both arranged along the circumference of the sealing flow channel 1 to completely seal the sealing flow channel 1 between the stator and the rotor and avoid the generation of unsealed gaps in the circumferential direction of the sealing flow channel 1.

[0064] In this embodiment, at least part of the first sealing structure 2 is inclined from the first fixed end 201 to the first movable end 202 toward the inlet side 4 of the sealing flow channel 1, that is, the first movable end 202 of the first sealing structure 2 is closer to the inlet side 4 of the sealing flow channel 1 than the first fixed end 201 of the first sealing structure 2; in this embodiment, by tilting at least part of the first sealing structure 2, a large amount of slag entering from the inlet of the sealing flow channel 1 can be moved along the slope of the first sealing structure 2 and accumulated on the slope of the first sealing structure 2, and the extrusion force provided by the slag on the first sealing structure 2 can be converted into a pressure for pressing the first movable end 202 of the first sealing structure 2 and the side wall of the sealing flow channel 1 and a pulling force on the first fixed end 201 of the first sealing structure 2. On the basis that the first fixed end 201 of the first sealing structure 2 is fixedly connected to the side wall of the sealing flow channel 1, that is, the slag accumulated on the slope of the first sealing structure 2 can make the sealing effect of the first sealing structure 2 better.

[0065] In this embodiment, there is no specific limitation on the positional relationship between the second fixed end 301 and the second movable end 302 of the second sealing structure 3, and the inclination direction of the second sealing structure 3; in a specific embodiment, at least part of the second sealing structure 3 is inclined from the second fixed end 301 to the second movable end 302 toward the inlet side 4 of the sealing flow channel 1; in another preferred embodiment, the second sealing structure 3 is arranged along the radial H direction of the sealing flow channel 1 from the second fixed end 301 to the second movable end 302 to intercept the fine debris leaked from the first sealing structure 2. The second sealing structure 3 in this embodiment adopts the radial H setting, which can make the second movable end 302 of the second sealing structure 3 fit more closely with the side wall of the sealing flow channel 1, so that the smaller debris leaked from the first sealing structure 2 can be intercepted by the second sealing structure 3.

[0066] In the present embodiment, by setting the inclination of the first sealing structure 2 and the second sealing structure 3, the first sealing structure 2 and the second sealing structure 3 can form different sealing function zones respectively. The first sealing structure 2, which is inclined from the first fixed end 201 to the first movable end 202 toward the inlet side 4 of the sealing flow channel 1, can carry more debris, thereby avoiding the risk of rapid failure of the inlet side 4 close to the sealing flow channel 1 due to the influence of a large amount of debris; at the same time, the first sealing structure 2 can leak some smaller debris to the second sealing structure 3, which is intercepted by the second sealing structure 3, thereby avoiding the first sealing structure 2 being affected by all the debris accumulation, resulting in the failure of the first sealing structure 2, and the occurrence of no debris intercepted at the second sealing structure 3, so that the first sealing structure 2 and the second sealing structure 3 share the burden evenly, thereby extending the service life of the first sealing structure 2 and the second sealing structure 3.

[0067] like Figure 1 and Figure 3 As shown, in a specific embodiment, the first sealing structure 2 has a plurality of first sealing members 21 arranged along the circumference of the sealing flow channel 1, and the second sealing structure 3 has a plurality of second sealing members 31 arranged along the circumference of the sealing flow channel 1;

[0068] Each of the first sealing members 21 has a third fixed end 2011 and a third movable end 2021, and each of the second sealing members 31 has a fourth fixed end 3011 and a fourth movable end 3021;

[0069] The third fixed ends 2011 of the plurality of first sealing members 21 cooperate along the circumference of the sealing flow channel 1 to form the first fixed end 201, and the third movable ends 2021 of the plurality of first sealing members 21 cooperate along the circumference of the sealing flow channel 1 to form the first movable end 202;

[0070] The fourth fixed ends 3011 of the plurality of second seals 31 cooperate along the circumference of the sealing channel 1 to form the second fixed ends 301 , and the third movable ends 2021 of the plurality of second seals 31 cooperate along the circumference of the sealing channel 1 to form the first movable ends 202 .

[0071] Due to the large diameter of the main drive sealing system of the shield machine and the uneven distribution of circumferential slag in the sealing channel 1, the first sealing structure 2 and the second sealing structure 3 may experience eccentric wear at a certain position. The sealing mechanism provided by the utility model comprises a plurality of first sealing members 21 arranged at circumferential intervals in the sealing channel 1 to form the first sealing structure 2, and a plurality of second sealing members 31 arranged at circumferential intervals in the sealing channel 1 to form the second sealing structure 3, which can facilitate the immediate replacement of a failed first seal 21 or a failed second seal 31.

[0072] Specifically in this embodiment, a plurality of first sealing members 21 are attached along the circumference of the sealing flow channel 1, and a plurality of second sealing members 31 are attached along the circumference of the sealing flow channel 1 to avoid leaving a sealing gap; in a specific embodiment, the first sealing member 21 has a third fixed end 2011 and a third movable end 2021, the third fixed end 2011 of the first sealing member 21 is connected to one of the inner side wall 11 and the outer side wall 12 of the sealing flow channel 1, and the third movable end 2021 is sealed against the other of the inner side wall 11 and the outer side wall 12 of the sealing flow channel 1, so that the first sealing member 21 can be sealed. While sealing the sealing channel 1, it also ensures that the driven rotor can rotate relative to the driven stator; in another specific embodiment, the second seal 31 has a fourth fixed end 3011 and a fourth movable end 3021, and the fourth fixed end 3011 of the second seal 31 is connected to one of the inner wall 11 and the outer wall 12 of the sealing channel 1, and the fourth movable end 3021 seals and abuts against the other of the inner wall 11 and the outer wall 12 of the sealing channel 1, so that the second seal 31 can seal the sealing channel 1 while ensuring that the driven rotor can rotate relative to the driven stator.

[0073] In a specific embodiment, the third fixed ends 2011 of the multiple first sealing members 21 cooperate along the circumference of the sealing channel 1 to form the first fixed end 201, that is, the multiple third fixed ends 2011 constitute the first fixed end 201 arranged in a ring on the circumference of the sealing channel 1; the third movable ends 2021 of the multiple first sealing members 21 cooperate along the circumference of the sealing channel 1 to form the first movable end 202, that is, the multiple third movable ends 2021 constitute the first movable end 202 arranged in a ring on the circumference of the sealing channel 1.

[0074] In a specific embodiment, the fourth fixed ends 3011 of multiple second sealing members 31 cooperate along the circumference of the sealing channel 1 to form the second fixed end 301, that is, multiple fourth fixed ends 3011 constitute the second fixed end 301 arranged in a ring on the circumference of the sealing channel 1; the fourth movable ends 3021 of multiple second sealing members 31 cooperate along the circumference of the sealing channel 1 to form the second movable end 302, that is, multiple fourth movable ends 3021 constitute the second movable end 302 arranged in a ring on the circumference of the sealing channel 1.

[0075] like Figure 1 and Figure 2 As shown, in a specific embodiment, the third fixed ends 2011 of the plurality of first seals 21 and the fourth fixed ends 3011 of the plurality of second seals 31 are connected to the outer wall 12 of the sealing channel 1, and the third movable ends 2021 of the plurality of first seals 21 and the fourth movable ends 3021 of the plurality of second seals 31 are abutted against the inner wall 11 of the sealing channel 1.

[0076] The sealing mechanism provided by the utility model defines the specific positions of the third fixed end 2011, the fourth fixed end 3011, the third movable end 2021 and the fourth movable end 3021, and connects the third fixed end 2011 and the fourth fixed end 3011 to the outer wall 12 of the sealing flow channel 1, that is, the stator housing of the main drive structure, so that the connection stability of the third fixed end 2011 and the fourth fixed end 3011 affected by the rotation of the rotor can be reduced; the third movable end 2021 and the fourth movable end 3021 are abutted against the inner wall 11 of the sealing flow channel 1, that is, the rotor housing of the main drive structure, and the abutment force of the third movable end 2021 and the fourth movable end 3021 on the rotating rotor surface can be flexibly adjusted.

[0077] Specifically in one embodiment of the present invention, at least a portion of the first sealing member 21 is inclined from the third fixed end 2011 to the third movable end 2021 toward the inlet side 4 of the sealed flow channel 1, that is, the third movable end 2021 of the first sealing member 21 is closer to the inlet side 4 of the sealed flow channel 1 than the third fixed end 2011 of the first sealing member 21, so that a large amount of debris entering from the inlet of the sealed flow channel 1 can be moved along the slope of the first sealing member 21 and accumulated on the slope of the first sealing member 21.

[0078] In another embodiment of the present invention, at least a portion of the second seal 31 is inclined from the fourth fixed end 3011 to the fourth movable end 3021 toward the inlet side 4 of the sealing flow channel 1; in another preferred embodiment, the second seal 31 is arranged along the radial direction H of the sealing flow channel 1 from the fourth fixed end 3011 to the fourth movable end 3021 to intercept small debris leaking from the first seal 21. The second seal 31 in this embodiment is arranged along the radial direction H of the sealing flow channel 1, so that the fourth movable end 3021 of the second seal 31 can fit more closely with the inner side wall 11 of the sealing flow channel 1, so that smaller debris leaking from the first seal 21 can be intercepted by the second seal 31.

[0079] like Figure 1 and Figure 4 As shown, in a specific embodiment, the first sealing member 21 has a plurality of arched brush bundles 221 arranged along the circumference of the sealing channel 1, and both ends 2111 of each of the arched brush bundles 221 are connected to the outer side wall 12 of the sealing channel 1 along the circumference of the sealing channel 1, and the bending portion 2112 of each of the arched brush bundles 221 is against the inner side wall 11 of the sealing channel 1.

[0080] The sealing mechanism provided by the utility model is provided with a bow-shaped brush filament bundle 221, which is a flexible filament bundle in the present embodiment, and the two ends of the filament bundle are the two ends 2111 of the bow-shaped brush filament bundle 221, and the two ends 2111 of the bow-shaped brush filament bundle 221 are connected to the outer side wall 12 of the sealing flow channel 1, that is, the middle part of the filament bundle is bent, and the bending part 2112 of each bow-shaped brush filament bundle 221 is also the middle bending part of the filament bundle. In this embodiment, each of the arched brush filament bundles 221 adopts an arched connection method, which can improve the structural rigidity of the arched brush filament bundle 221 and make the deformation of the arched brush filament bundle 221 not affected by the rotation of the rotor; at the same time, the contact between the bending part 2112 of the arched brush filament bundle 221 and the inner wall 11 of the sealing channel 1 can be approximated as surface contact, and the friction force of the contact can be dispersed. Compared with the point contact between the traditional brush filament and the inner wall 11 of the sealing channel 1, it can effectively reduce the damage rate of the brush filament and increase the service life of the inner wall 11 of the sealing channel 1.

[0081] In this embodiment, the two ends 2111 of each of the arched brush filament bundles 221 are connected to the outer side wall 12 of the sealed flow channel 1 along the circumference of the sealed flow channel 1, and the bending portion 2112 of each of the arched brush filament bundles 221 is against the inner side wall 11 of the sealed flow channel 1, that is, the arched brush filament bundle 221 is inclined toward the inlet side 4 of the sealed flow channel 1 from the first fixed end 201 to the first movable end 202, and the bending portion 2112 of the arched brush filament bundle 221 extends toward the inlet side 4 of the sealed flow channel 1.

[0082] like Figure 1 and Figure 4 As shown, in a specific embodiment, a plurality of the arcuate brush filament bundles 221 are continuously arranged along the circumference of the sealing flow channel 1, or each of the arcuate brush filament bundles 221 and its adjacent arcuate brush filament bundles 221 are partially staggered and overlapped.

[0083] The sealing mechanism provided by the utility model can make the two adjacent arched brush filament bundles 221 overlap with each other by partially staggered and overlapping arrangement of two adjacent arched brush filament bundles 221. The overlapping area of ​​the arched brush filament bundles 221 can improve the overall stiffness of the arched brush filament bundles 221. At the same time, the overlapping area of ​​the arched brush filament bundles 221 will also form a small gap, which is convenient for smaller slag to pass through the first sealing component 21 and move to the second sealing component 31, so that the second sealing component 31 can intercept it, thereby reducing the slag blocking pressure of the first sealing component 21.

[0084] Specifically in one embodiment of the present invention, a plurality of the arcuate brush filament bundles 221 are continuously arranged along the circumference of the sealed flow channel 1 , that is, adjacent ends of two adjacent arcuate brush filament bundles 221 are connected to the same position on the outer side wall 12 of the sealed flow channel 1 .

[0085] Specifically, in another embodiment of the present invention, each of the arched brush filament bundles 221 is partially overlapped with its adjacent arched brush filament bundles 221, that is, a plurality of the arched brush filament bundles 221 are arranged along the circumference of the sealed flow channel 1, wherein both ends 2111 of each arched brush filament bundle 221 are connected to the outer wall 12 of the sealed flow channel 1, and one end of an adjacent arched brush filament bundle 221 is connected to a position between the two ends 2111 of the arched brush filament bundle 221 along the circumference of the sealed flow channel 1, wherein the two ends 2111 of two adjacent arched brush filament bundles 221 are arranged front and back along the axial direction F of the sealed flow channel 1. In other embodiments, the two ends 2111 of two adjacent arched brush filament bundles 221 can also be arranged at the same axial position along the axial direction F of the sealed flow channel 1, that is, the two ends 2111 of two adjacent arched brush filament bundles 221 are arranged at intervals along the circumference of the sealed flow channel 1.

[0086] like Figure 1 and Figure 2 As shown, in a specific embodiment, the first sealing member 21 further comprises a front baffle plate 212 and a rear baffle plate 213 spaced apart along the axial direction F of the sealing flow channel 1, the front baffle plate 212 and the rear baffle plate 213 forming a third fixed end 2011 of the first sealing member 21, the front baffle plate 212 being closer to the inlet side 4 than the rear baffle plate 213,

[0087] Part of the bow-shaped brush bundle 221 is sandwiched between the front baffle 212 and the rear baffle 213 . In the radial direction H of the sealed flow channel 1 , the thickness of the front baffle 212 is smaller than the thickness of the rear baffle 213 .

[0088] The sealing mechanism provided by the utility model clamps part of the bow-shaped brush filament bundle 221 through the front baffle plate 212 and the rear baffle plate 213 to prevent the bow-shaped brush filament bundle 221 from being affected by the rotation of the rotor and the extrusion of slag and stone and causing the front and rear position to be offset. The thickness of the front baffle plate 212 is limited to be less than the thickness of the rear baffle plate 213 in the radial direction H of the sealing flow channel 1 to prevent the inclination angle of the bow-shaped brush filament bundle 221 from changing, thereby reducing the friction between the bow-shaped brush filament bundle 221 and the inner side wall 11 of the sealing flow channel 1 and extending the service life of the bow-shaped brush filament bundle 221 and the inner side wall 11 of the sealing flow channel 1.

[0089] Specifically, in the present embodiment, the front baffle 212 and the rear baffle 213 form the third fixed end 2011 of the first seal 21, that is, the front baffle 212 and the rear baffle 213 of the plurality of first seals 21 are combined to form the first fixed end 201 of the first sealing structure 2, the thickness of the front baffle 212 and the thickness of the rear baffle 213 are the height along the radial direction H of the sealing flow channel 1, that is, the distance that the front baffle 212 and the rear baffle 213 protrude from the outer wall 12 of the sealing flow channel 1 respectively. In the present embodiment, the front baffle 212 is arranged closer to the inlet side 4 than the rear baffle 213, and the thickness of the front baffle 212 is less than the thickness of the rear baffle 213, that is, the part of the bow-shaped brush bundle 221 protruding from the front baffle 212 in the radial direction H of the sealing flow channel 1 is inclined toward the inlet side 4 of the sealing flow channel 1 from the first fixed end 201 to the first movable end 202.

[0090] like Figure 1 and Figure 2 As shown, in a specific embodiment, the first sealing member 21 also has a clamping plate 214, which is arranged between the front baffle plate 212 and the rear baffle plate 213, one end of the clamping plate 214 is connected to the outer wall 12 of the sealing flow channel 1, and both ends 2111 of the plurality of bow-shaped brush bundles 221 are clamped at the other end of the clamping plate 214.

[0091] The sealing mechanism provided by the utility model can fix the inclination angle H of the arcuate brush filament bundle 221 and the radial direction H of the sealing flow channel 1 by setting the clamping plate 214, so that only the bending part 2112 of the arcuate brush filament bundle 221 protrudes from the clamping plate 214 and abuts against the inner wall 11 of the sealing flow channel 1, thereby avoiding the displacement of the front and rear position of the arcuate brush filament bundle 221 due to the rotation of the rotor and the squeezing of the slag, thereby improving the structural rigidity of the arcuate brush filament bundle 221.

[0092] Specifically, in this embodiment, the clamping plate 214 is generally two plates, and both ends 2111 of the arcuate brush bundle 221 are clamped between the two plates of the clamping plate 214. In other embodiments, the specific structure of the clamping plate 214 is not limited. In this embodiment, the clamping plate 214 is inclined from the first fixed end 201 to the first movable end 202 toward the inlet side 4 of the sealed flow channel 1. In other embodiments, the clamping plate 214 can also be extended from the first fixed end 201 to the first movable end 202 along the radial direction H of the sealed flow channel 1, and there is no specific limitation on this. In this embodiment, the arcuate brush bundle 221 can also be a part protruding from the clamping plate 214 in the radial direction H of the sealed flow channel 1, and is inclined from the first fixed end 201 to the first movable end 202 toward the inlet side 4 of the sealed flow channel 1.

[0093] like Figure 2 As shown, in a specific embodiment, the first sealing member 21 further has a height-adjustable radial block 215 , and the radial block 215 is connected between the clamping plate 214 and the outer side wall 12 of the sealing flow channel 1 .

[0094] The sealing mechanism provided by the utility model can adjust the protruding distance of the clamp plate 214 from the outer side wall 12 of the sealing flow channel 1 through the height-adjustable radial block 215, so that the bending part 2112 of the worn arched brush filament bundle 221 can continue to abut against the inner side wall 11 of the sealing flow channel 1. At the same time, if the arched brush filament bundle 221 is completely worn, in order to improve the maintenance efficiency and avoid the influence of the replacement of the arched brush filament bundle 221 causing the shield machine to stop for too long, adding the radial block 215 can make the clamp plate 214 and the inner side wall 11 of the sealing flow channel 1 produce an interference fit, and at the same time, the contact area between the clamp plate 214 and the inner side wall 11 of the sealing flow channel 1 is staggered with the worn area of ​​the arched brush filament bundle 221, so that the brush seal becomes a single-finger slag-blocking seal, thereby improving the service life of the inner side wall 11 of the sealing flow channel 1. In this embodiment, the radial block 215 can be a block of different heights, which can be replaced during the shutdown maintenance of the shield machine, and can also be a telescopic member with adjustable height, and there is no specific restriction on this.

[0095] In other embodiments, a height-adjustable radial block 215 may be added between the front baffle plate 212 and the outer wall 12 of the sealing flow channel 1, or between the rear baffle plate 213 and the outer wall 12 of the sealing flow channel 1, so that the front baffle plate 212 and the rear baffle plate 213 become single-finger slag blocking seals, and there is no limitation on this.

[0096] like Figure 1As shown, in a specific embodiment, part of the bow-shaped brush filament bundle 221 is inclined toward the inlet side 4 of the sealing flow channel 1 from the third fixed end 2011 to the third movable end 2021, and the angle A between the bow-shaped brush filament bundle 221 and the radial H direction of the sealing flow channel 1 is greater than or equal to 30°, and / or the angle A is less than or equal to 45°.

[0097] The sealing mechanism provided by the utility model limits the angle A between the arched brush filament bundle 221 and the radial H direction of the sealing flow channel 1, thereby avoiding the problem that the angle A is too large, which may cause excessive tension between the arched brush filament bundle 221 and the outer wall 12 of the sealing flow channel 1 due to the influence of slag and stone, thereby affecting the connection stability between the arched brush filament bundle 221 and the sealing flow channel 1; it can also avoid the problem that the angle A is too small, which may cause excessive thrust of the arched brush filament bundle 221 due to the influence of slag and stone, thereby affecting the abutment stability of the arched brush filament bundle 221 and the inner wall 11 of the sealing flow channel 1.

[0098] In the present embodiment, part of the arched brush filament bundle 221 is inclined from the third fixed end 2011 to the third movable end 2021 toward the inlet side 4 of the sealed flow channel 1. In one embodiment, the part of the arched brush filament bundle 221 that protrudes from the front baffle 212 in the radial direction H of the sealed flow channel 1 is inclined from the third fixed end 2011 to the third movable end 2021 toward the inlet side 4 of the sealed flow channel 1; in another embodiment, the part of the arched brush filament bundle 221 that protrudes from the clamping plate 214 in the radial direction H of the sealed flow channel 1 is inclined from the third fixed end 2011 to the third movable end 2021 toward the inlet side 4 of the sealed flow channel 1, and there is no specific limitation on this.

[0099] like Figure 1 and Figure 2 As shown, in a specific embodiment, the second sealing member 31 has a brush filament bundle 311 arranged circumferentially along the sealing channel 1, and the brush filament bundle 311 is composed of a plurality of brush filaments, one end of the plurality of brush filaments are tightly bound to form a tight binding end 3111 of the brush filament bundle 311, and the tight binding end 3111 is connected to the outer side wall 12 of the sealing channel 1, and the other end of the plurality of brush filaments abuts against the inner side wall 11 of the sealing channel 1.

[0100] The sealing mechanism provided by the utility model forms a second sealing member 31 through a brush bundle 311 composed of multiple brush filaments. Compared with the bow-shaped brush bundle 221, the brush bundle 311 of this embodiment is in point contact with the inner wall 11 of the sealing flow channel 1, and has a higher efficiency in blocking smaller slag stones.

[0101] Specifically in the present embodiment, one end of the plurality of brush filaments is formed by a hoop to form a hoop end 3111 of the brush filament bundle 311, and the hoop end of the brush filament bundle 311 is connected to the outer wall 12 of the sealed flow channel 1. In a specific embodiment, the extension directions of the plurality of brush filaments of the brush filament bundle 311 are different, that is, from the hoop end 3111 to the inner wall 11 of the sealed flow channel 1, the angles between each brush filament and the inner wall 11 of the sealed flow channel 1 are different, that is, the brush filament bundle 311 has an opening angle B from the hoop end 3111 to the inner wall 11 of the sealed flow channel 1; in other embodiments, the extension directions of the plurality of brush filaments of the brush filament bundle 311 can also be set along the radial direction H of the sealed flow channel 1, and there is no specific limitation on this.

[0102] like Figure 1 and Figure 2 As shown, in a specific embodiment, the brush bundle 311 has an opening angle B from the tightening end 3111 toward the inner side wall 11 of the sealing flow channel 1.

[0103] The sealing mechanism provided by the utility model, that is, from the tightening end 3111 to the inner side wall 11 of the sealing flow channel 1, the angles between each brush filament and the inner side wall 11 of the sealing flow channel 1 are different, and the opening angle B is the angle between the brush filaments located at the outermost side of the brush filament bundle 311 and the radial direction H of the sealing flow channel 1. In this embodiment, by setting the opening angle B, the contact width between the brush filament bundle 311 and the inner side wall 11 of the sealing flow channel 1 along the axial direction F of the sealing flow channel 1 can be increased, and the sealing effect can be improved.

[0104] like Figure 1 and Figure 2 As shown, in a specific embodiment, the opening angle B of the brush filament bundle 311 is 4° to 8°.

[0105] The sealing mechanism provided by the utility model can avoid the reduction of the friction life of the inner wall 11 of the sealing flow channel 1 due to too large an opening angle B by limiting the opening angle B of the brush filament bundle 311, and can also avoid the reduction of the contact width between the brush filament bundle 311 and the inner wall 11 of the sealing flow channel 1 along the axial direction F of the sealing flow channel 1 due to too small an opening angle B, thereby preventing the sealing effect of the brush filament bundle 311 from being too low.

[0106] In this embodiment, the opening angle B of the brush filament bundle 311 can be any angle between 4° and 8°. Preferably, the opening angle B of the brush filament bundle 311 can be set to 6°, and there is no specific limitation on this.

[0107] like Figure 1 and Figure 2As shown, in a specific embodiment, the second seal 31 also has a front clamping plate 312 and a rear clamping plate 313 spaced apart along the axial direction F of the sealing flow channel 1, the front clamping plate 312 and the rear clamping plate 313 form a fourth fixed end 3011 of the second seal 31, the front clamping plate 312 is arranged closer to the inlet side 4 than the rear clamping plate 313, and part of the brush bundle 311 is clamped between the front baffle 212 and the rear baffle 213.

[0108] The sealing mechanism provided by the utility model clamps part of the brush bundle 311 through the front clamping plate 312 and the rear clamping plate 313, thereby preventing the brush bundle 311 from being affected by the rotation of the rotor and the extrusion of the slag and causing the front and rear position to shift, avoiding the change in the inclination angle of the brush bundle 311, and avoiding the leakage of smaller slag from the second sealing component 31.

[0109] Specifically in this embodiment, the front clamping plate 312 and the rear clamping plate 313 form the fourth fixed end 3011 of the second seal 31 , that is, the front clamping plates 312 and the rear clamping plates 313 of the second seal 31 are combined to form the second fixed end 301 of the second sealing structure 3 .

[0110] like Figure 1 and Figure 4 As shown, in a specific embodiment, the arched brush filament bundle 221 is composed of a plurality of brush filaments, and the brush filaments of the arched brush filament bundle 221 and the brush filaments of the brush filament bundle 311 are made of aramid fiber material or polytetrafluoroethylene material.

[0111] The sealing mechanism provided by the utility model can ensure the wear resistance of the brush filaments by limiting the materials of the brush filaments constituting the bow-shaped brush filament bundle 221 and the brush filament bundle 311, wherein the brush filaments made of polytetrafluoroethylene material have a self-lubricating effect and a low friction coefficient.

[0112] Specifically in this embodiment, the bow-shaped brush filament bundle 221 can be woven only from brush filaments made of aramid fiber material, or can be woven only from brush filaments made of polytetrafluoroethylene material. In other embodiments, the bow-shaped brush filament bundle 221 can also be woven together from brush filaments made of polytetrafluoroethylene material and brush filaments made of aramid fiber material, and there is no specific limitation on this.

[0113] In another embodiment, the multiple brush filaments of the brush filament bundle 311 may be composed only of brush filaments made of aramid fiber material, and the multiple brush filaments of the brush filament bundle 311 may be composed only of brush filaments made of polytetrafluoroethylene material. In other embodiments, the brush filament bundle 311 may also be composed of brush filaments made of polytetrafluoroethylene material and brush filaments made of aramid fiber material, and there is no specific limitation on this.

[0114] like Figure 4 As shown, in a specific embodiment, in the bow-shaped brush filament bundle 221 or the brush filament bundle 311, the number of brush filaments made of aramid fiber material and the number of brush filaments made of polytetrafluoroethylene material are 1:1.

[0115] The sealing mechanism provided by the utility model can ensure that the bow-shaped brush filament bundle 221 and the brush filament bundle 311 have the advantages of wear resistance, self-lubrication and low friction coefficient by limiting the ratio of the number of brush filaments made of aramid fiber material to the number of brush filaments made of polytetrafluoroethylene material.

[0116] like Figure 2 As shown, in a specific embodiment, the clamping plate 214 is made of polyurethane rubber material.

[0117] The sealing mechanism provided by the utility model limits the clamping plate 214 to a polyurethane rubber material, which can ensure that the clamping plate 214 has an interference fit with the inner wall 11 of the sealing flow channel 1. When the brush seal becomes a single-finger slag-blocking seal, the wear resistance of the clamping plate 214 can be improved.

[0118] like Figure 1 As shown, in a specific embodiment, along the circumference of the sealing flow channel 1, the density of the brush filaments of the brush filament bundle 311 is 1000 filaments / mm to 3000 filaments / mm.

[0119] The sealing mechanism provided by the utility model limits the density of the brush filaments of the brush filament bundle 311 along the circumference of the sealing flow channel 1, which can avoid the problem of poor sealing effect caused by too small brush filament density, and can also avoid the problem of serious wear of the brush filaments on the inner wall 11 of the sealing flow channel 1 caused by too large brush filament density.

[0120] like Figure 4 In a specific embodiment, along the circumference of the sealed flow channel 1, the density of the arched brush filament bundles 221 is 200 bundles / m to 400 bundles / m.

[0121] The sealing mechanism provided by the utility model limits the density of the arched brush filament bundle 221 along the circumference of the sealing flow channel 1, which can avoid the problem of poor sealing effect and poor structural rigidity caused by the low density of the arched brush filament bundle 221, and can also avoid the problem of serious wear of the inner wall 11 of the sealing flow channel 1 by the arched brush filament bundle 221 due to the high density of the brush filament bundle 311.

[0122] like Figure 4 As shown, in a specific embodiment, the density of the brush filaments in each of the arched brush filament bundles 221 is 6000 to 12000 filaments per bundle.

[0123] The sealing mechanism provided by the utility model limits the brush density of each of the arched brush filament bundles 221, which can avoid the problem of poor sealing effect and poor structural rigidity caused by the brush density of the arched brush filament bundles 221 being too small, and can also avoid the problem of serious wear of the inner wall 11 of the sealing flow channel 1 by the arched brush filament bundles 221 due to the brush density of the arched brush filament bundles 221 being too large.

[0124] like Figure 4 As shown, in a specific embodiment, the outer surface of the brush filament is covered with a coating, and the coating is formed by coating with an oleophobic material.

[0125] The sealing mechanism provided by the utility model can prevent the oil flowing into the sealing channel 1 from adhering to the brush wires, thereby preventing the friction between the brush wires and the inner wall 11 of the sealing channel 1 from increasing due to the adhesion of the oil flowing into the sealing channel 1 from the sealing slideway provided with a lip seal connected to the outlet side of the sealing channel 1.

[0126] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific embodiment of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A sealing mechanism, which is arranged in a sealing flow channel of a shield machine, characterized in that: The sealing mechanism comprises: a first sealing structure and a second sealing structure arranged along the circumference of the sealing flow channel, the first sealing structure and the second sealing structure are arranged along the axial direction of the sealing flow channel, and the first sealing structure is arranged closer to the inlet side of the sealing flow channel than the second sealing structure; The first sealing structure has a first fixed end and a first movable end, the first fixed end is used to connect with one of the inner side wall and the outer side wall of the sealing flow channel, and the first movable end is used to seal against the other of the inner side wall and the outer side wall of the sealing flow channel; The second sealing structure has a second fixed end and a second movable end, the second fixed end is used to be connected to one of the inner side wall and the outer side wall of the sealing flow channel, and the second movable end is used to seal against the other of the inner side wall and the outer side wall of the sealing flow channel; At least a portion of the first sealing structure is inclined toward the inlet side of the sealing flow channel from the first fixed end to the first movable end.

2. The sealing mechanism according to claim 1, characterized in that: The first sealing structure comprises a plurality of first sealing members spaced apart along the circumference of the sealing flow channel, and the second sealing structure comprises a plurality of second sealing members spaced apart along the circumference of the sealing flow channel; Each of the first sealing members has a third fixed end and a third movable end, and each of the second sealing members has a fourth fixed end and a fourth movable end; The third fixed ends of the plurality of first sealing members cooperate along the circumference of the sealing flow channel to form the first fixed end, and the third movable ends of the plurality of first sealing members cooperate along the circumference of the sealing flow channel to form the first movable end; The fourth fixed ends of the plurality of second seals cooperate along the circumference of the sealing flow channel to form the second fixed ends, and the third movable ends of the plurality of second seals cooperate along the circumference of the sealing flow channel to form the first movable ends.

3. The sealing mechanism according to claim 2, characterized in that: The third fixed ends of the first seals and the fourth fixed ends of the second seals are connected to the outer wall of the sealing channel, and the third movable ends of the first seals and the fourth movable ends of the second seals are abutted against the inner wall of the sealing channel.

4. The sealing mechanism according to claim 3, characterized in that: The first sealing member has a plurality of arcuate brush bundles arranged along the circumference of the sealing flow channel, both ends of each arcuate brush bundle are connected to the outer side wall of the sealing flow channel along the circumference of the sealing flow channel, and the bending portion of each arcuate brush bundle is abutted against the inner side wall of the sealing flow channel.

5. The sealing mechanism according to claim 4, characterized in that: Each of the arcuate brush filament bundles is continuously arranged along the circumferential direction of the sealing flow channel, or each of the arcuate brush filament bundles and its adjacent arcuate brush filament bundles are partially arranged in a staggered and overlapping manner.

6. The sealing mechanism according to claim 4, characterized in that: The first seal also has a front baffle and a rear baffle arranged axially at intervals along the sealing flow channel, the front baffle and the rear baffle forming a third fixed end of the first seal, the front baffle being closer to the inlet side than the rear baffle, Part of the bow-shaped brush bundle is clamped between the front baffle and the rear baffle, and in the radial direction of the sealed flow channel, the thickness of the front baffle is smaller than the thickness of the rear baffle.

7. The sealing mechanism according to claim 6, characterized in that: The first sealing member also has a clamping plate, which is arranged between the front baffle and the rear baffle. One end of the clamping plate is connected to the outer side wall of the sealing flow channel, and both ends of the plurality of bow-shaped brush bundles are clamped at the other end of the clamping plate.

8. The sealing mechanism according to claim 7, characterized in that: The first sealing member also has a radial block with adjustable height, and the radial block is connected between the clamping plate and the outer side wall of the sealing flow channel.

9. The sealing mechanism according to claim 4, characterized in that: Part of the arched brush filament bundle is inclined toward the inlet side of the sealed flow channel from the third fixed end to the third movable end, and the angle between the arched brush filament bundle and the radial direction of the sealed flow channel is greater than or equal to 30°, and / or the angle is less than or equal to 45°.

10. The sealing mechanism according to claim 4, characterized in that: The second sealing component has a brush bundle arranged along the circumference of the sealing flow channel, and the brush bundle is composed of multiple brush filaments. One ends of the multiple brush filaments are tightly bound to form a tight end of the brush bundle, and the tight end is connected to the outer side wall of the sealing flow channel. The other ends of the multiple brush filaments abut against the inner side wall of the sealing flow channel.

11. The sealing mechanism according to claim 10, characterized in that: The brush bundle has an opening angle from the tightening hoop end toward the inner side wall of the sealing flow channel.

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