CN114198499A

CN114198499A - Centering adjusting mechanism and centering adjusting method of labyrinth sealing structure

Info

Publication number: CN114198499A
Application number: CN202111482373.3A
Authority: CN
Inventors: 任高林; 张学伟; 魏强; 雷晨辉; 刘瑶
Original assignee: Beijing Aerospace Yisen Wind Tunnel Engineering Technology Co ltd
Current assignee: Beijing Aerospace Yisen Wind Tunnel Engineering Technology Co ltd
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2022-03-18

Abstract

The utility model provides a centering adjustment mechanism and labyrinth seal structure's centering adjustment method, centering adjustment mechanism is used for setting up two connecting pieces each other centering, including first enclasping ring, second enclasping ring and guide bar, first enclasping ring and second enclasping ring are connected respectively on the both ends of guide bar, and it is adjustable along the guide bar position, first enclasping ring is formed with first enclasping space, the second enclasping ring is formed with the second enclasping space, the central axis in first enclasping space and the central axis in second enclasping space pass through the guide bar and limit the axiality. When this disclosure is centering adjustment, remove two connecting pieces that need be centering each other along the guide bar, just can satisfy the requirement of the occasion installation in-process axiality that needs centering such as labyrinth seal structure, easy operation, the good reliability has practiced thrift the human cost greatly.

Description

Centering adjusting mechanism and centering adjusting method of labyrinth sealing structure

Technical Field

The disclosure relates to the technical field of centering adjustment, in particular to a centering adjustment mechanism and a centering adjustment method of a labyrinth seal structure.

Background

In the fields of missile test beds, pipelines, wind tunnels and the like, labyrinth seal structures are very common, and particularly, in the missile engine test bed, the labyrinth seal structures are applied, wherein a circumferential gap is required between a labyrinth inner sleeve and a labyrinth outer sleeve, the labyrinth inner sleeve and the labyrinth outer sleeve are axially centered on the same horizontal line, and the coaxiality requirement is high. In the labyrinth seal structure, the inner and outer sleeves of the labyrinth are difficult to align, the installation is troublesome, the time consumption is long, and the labor cost is high; in addition, in order to meet the use under different working conditions, the installation times of the inner and outer casings of the labyrinth are more, and because the requirement on the coaxiality is high, once the experimental environment changes, the circumferential clearance between the inner and outer casings of the labyrinth is easily uneven, and in order to ensure the accuracy of the experiment, the inner and outer casings of the labyrinth need to be frequently centered; because of this, when the master worker installs the labyrinth inner sleeve and the labyrinth outer sleeve on the spot, in order to satisfy the centering requirement, usually just adjust one whole day, and the work load is very loaded down with trivial details.

Disclosure of Invention

In view of this, according to an aspect of the present disclosure, a centering adjustment mechanism is provided, and the technical solution is as follows.

A centering adjusting mechanism is used for centering two connecting pieces and comprises a first clamping ring, a second clamping ring and a guide rod;

the first clasping ring and the second clasping ring are respectively connected to two ends of the guide rod, and the positions of the first clasping ring and the second clasping ring along the guide rod are adjustable;

wherein, first enclasping encircles and is formed with first space of enclasping, the second enclasping encircles and is formed with the second space of enclasping, the central axis in first enclasping space with the central axis in second enclasping space passes through the axiality is injectd to the guide bar.

In an embodiment, the first clasping ring comprises at least two first split pieces, and the at least two first split pieces enclose the first clasping space; the second enclasping ring comprises at least two second split pieces, and the second split pieces surround to form the second enclasping space.

In an embodiment, the first clasp ring is divided into two first split parts with the same size in the diameter direction, and the two first split parts are connected through a fastener.

In an embodiment, the second clasp ring is divided into two second split parts with the same size in the diameter direction, and the two second split parts are connected through a fastener.

In an embodiment, the first clasping ring is uniformly provided with a plurality of connecting holes for connecting the adjusting piece in the circumferential direction, and the first clasping ring has an outer wall surface, and the connecting holes penetrate from the outer wall surface to the first clasping space.

In an embodiment, the first clasping ring is further provided with an observation window penetrating from the outer wall surface to the first clasping space.

In one embodiment, a fastening element is connected to the first clasp, the fastening element having a positioning shoulder, by means of which one of the two connecting elements is axially positioned.

In an implementation mode, a lifting lug is arranged on the first holding ring and comprises a first lifting hole and a second lifting hole, the first lifting hole is in a hook shape and is provided with an opening, and the second lifting hole is a circular hole.

According to another aspect of the present disclosure, there is also provided a centering adjustment method for a labyrinth seal structure, in which the centering adjustment mechanism performs centering adjustment on the labyrinth seal structure including a labyrinth inner sleeve and a labyrinth outer sleeve, the centering adjustment method including the steps of:

the labyrinth outer sleeve is fixed in the first holding space through the first holding ring;

the labyrinth inner sleeve is fixed in a second holding space through a second holding ring;

the inner labyrinth sleeve is moved into the inner cavity of the outer labyrinth sleeve along the guide rod through a hoisting tool so that the outer labyrinth sleeve and the inner labyrinth sleeve are coaxially arranged, and the circumferential gap between the inner labyrinth sleeve and the outer labyrinth sleeve is finely adjusted.

In one embodiment, in the step of fine adjusting the circumferential gap between the inner labyrinth sleeve and the outer labyrinth sleeve, a plurality of adjusting members uniformly arranged in the circumferential direction of the first clamping ring are radially adjusted until the coaxiality of the inner labyrinth sleeve and the outer labyrinth sleeve meets the requirement.

The present disclosure has the following beneficial effects: based on the setting of the centering adjustment mechanism including first enclasping ring, second enclasping ring and guide bar, when centering adjustment is carried out, two connecting pieces that need centering each other are removed along the guide bar, just can satisfy the requirement of the occasion installation in-process axiality of needs centering such as labyrinth seal structure, easy operation, good reliability has practiced thrift the human cost greatly.

Advantages and features of the present disclosure are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings of the present disclosure are included to provide an understanding of the present disclosure. The drawings illustrate embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure. In the drawings, there is shown in the drawings,

fig. 1 is a perspective view (looking in one direction) of a centering adjustment mechanism according to an exemplary embodiment of the present disclosure;

FIG. 2 is a perspective view (looking in another direction) of a centering adjustment mechanism according to an exemplary embodiment of the present disclosure;

FIG. 3 is a block diagram of the first clasp of FIG. 1;

FIG. 4 is a block diagram of the first split of FIG. 3;

FIG. 5 is a block diagram of the second clasp of FIG. 1;

FIG. 6 is a block diagram of the fixture of FIG. 1;

FIG. 7 is a schematic structural view of centering adjustment of a labyrinth seal using a centering adjustment mechanism according to an exemplary embodiment of the present disclosure;

FIG. 8 is a side view of FIG. 7;

fig. 9 is a sectional view taken along line B-B in fig. 8.

The reference numbers in the figures illustrate:

10. a first clasping ring; 101. a first holding space; 102. an outer wall surface; 103. an inner wall surface; 11. a first valving member; 12. connecting holes; 13. an observation window; 14. lifting lugs; 141. a first hoisting hole; 142. a second hoisting hole; 15. a first axial bore; 16. a first connecting lug; 161. a first mating hole; 20. a second clasping ring; 201. a second holding space; 21. a second valving member; 22. a second axial bore; 23. a second engaging lug; 231. a second docking hole; 30. a guide bar; 31. a first fastener; 32. a second fastener; 40. an adjustment member; 50. a fixing member; 51. a third valving member; 511. positioning the shoulder; 512. a connecting portion; 200. a labyrinth casing; 201. labyrinth teeth; 300. the labyrinth is internally sheathed.

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the present disclosure. One skilled in the art, however, will understand that the following description merely illustrates alternative embodiments of the disclosure and that the disclosure may be practiced without one or more of these details. In addition, some features that are well known in the art have not been described in detail to avoid obscuring the present disclosure.

The centering adjusting mechanism is mainly used for adjusting two connecting pieces which need to be centered with each other in the fields of missile test beds, pipelines, wind tunnels and the like, so that the requirement of coaxiality between the two connecting pieces is met.

As shown in fig. 1 to 6, the centering adjustment mechanism includes a first clasp 10, a second clasp 20, and a guide bar 30. First enclasping ring 10 and second enclasping ring 20 are connected respectively on the both ends of guide bar 30, and along guide bar 30 adjustable in position, and first enclasping ring 10 and second enclasping ring 20 set up at the length direction interval of guide bar 30. The first clasping ring 10 is formed with a first clasping space 101, and the first clasping space 101 can be used for accommodating one of two connecting pieces which need to be aligned with each other. The second clasping ring 20 is formed with a second clasping space 201, and the second clasping space 201 can accommodate the other one of the two connecting pieces which need to be aligned with each other. The center axis of the first enclave space 101 and the center axis of the second enclave space 201 define a coaxiality by the guide bar 30.

In an exemplary embodiment of the present disclosure, the first clasping ring 10 is a circular ring, so that the first clasping space 101 formed by the first clasping ring 10 is cylindrical; the second clasping ring 20 is also a circular ring, so that the second clasping space 201 formed by the second clasping ring 20 is also cylindrical; the number of the guide rods 30 is multiple, the plurality of the guide rods 30 are uniformly distributed in the circumferential direction of the first clasping ring 10, similarly, the plurality of the guide rods 30 are also uniformly distributed in the circumferential direction of the second clasping ring 20, in order to adjust the axial position of the first clasping ring 10 relative to the guide rods 30 conveniently, the first clasping ring 10 is provided with a first axial hole 15, one end of each guide rod 30 is inserted into the first axial hole 15, and the depth of each guide rod 30 inserted into the first axial hole 15 is adjusted, so that the purpose of adjusting the axial position of the first clasping ring 10 in the guide rods 30 can be achieved; in order to adjust the axial position of the second clasp 20 relative to the guide rod 30 conveniently, the second clasp 20 is provided with a second axial hole 22, the other end of the guide rod 30 is inserted into the second axial hole 22, and the depth of the guide rod 30 inserted into the second axial hole 22 is adjusted, so that the purpose of adjusting the axial position of the second clasp 20 in the guide rod 30 can be achieved. The cross-sectional shape of the guide bar 30 may be dovetail-shaped, circular or square, and the like, and correspondingly, the cross-sectional shapes of the first axial hole 15 and the second axial hole 22 may be dovetail-shaped, circular or square, and the like.

As shown in fig. 3 and 4, in an exemplary embodiment of the present disclosure, the first clasping ring 10 includes two first split pieces 11, the two first split pieces 11 enclose and form a first clasping space 101, the first split pieces 11 are arc-shaped, first connecting lugs 16 are formed at two ends of the arc-shaped first split pieces 11 in the circumferential direction, first connecting holes 161 are formed in the first connecting lugs 16, and after the two first split pieces 11 are combined together based on the arrangement of the first connecting holes 161, the first connecting lugs 16 of the two first split pieces 11 can be connected through a fastener such as a screw or a bolt. Particularly, first enclasping ring 10 is divided into two first split parts 11 that the size is the same by diameter direction, connects through the fastener between two first split parts 11, and the setting of first enclasping ring 10 based on split structure is when pressing from both sides tight one of them connecting piece, conveniently presss from both sides tight operation to, after accomplishing centering adjustment, also convenient dismantlement.

It should be understood that the first clasp 10 is not limited to the structural arrangement of two first split members 11 with the same size, in a non-illustrated embodiment, the first clasp 10 may also be composed of three or more first split members 11, that is, the first clasp 10 may be composed of at least two first split members 11, and the at least two first split members 11 may be the same or different in size, as long as the first clasp 10 is in a split structure and can function to clamp one of the connectors to be centered.

As shown in fig. 5, in an exemplary embodiment of the present disclosure, the second clasping ring 20 includes two second split parts 21, two of the second split parts 21 enclose to form a second clasping space 201, the second split parts 21 are arc-shaped, second connecting lugs 23 are formed at two ends of the arc-shaped second split part 21 in the circumferential direction, a second connecting hole 231 is formed in the second connecting lug 23, and after the two second split parts 21 are combined based on the second connecting hole 231, the second connecting lugs 23 of the two second split parts 21 can be connected through a fastener such as a screw or a bolt. Particularly, the second enclasping ring 20 is divided into two second split parts 21 with the same size by the diameter direction, and the two second split parts 21 are connected through a fastener, and the second enclasping ring 20 based on the split structure is arranged, so that the clamping operation is convenient when another connecting piece is clamped, and the centering adjustment is completed, and the disassembly is also convenient.

Similarly, the second clasp 20 is not limited to the structural arrangement of two second split parts 21 with the same size, in an embodiment not shown, the second clasp 20 may also be composed of three or more second split parts 21, that is, the second clasp 20 may be composed of at least two second split parts 21, and the sizes of the at least two second split parts 21 may be the same or different, and the second clasp 20 may be of a split structure and can play a role in clamping another connector to be centered.

Referring to fig. 1, 2 and 3 again, in order to facilitate fine adjustment of a circumferential gap between two connecting members, so as to further ensure coaxiality between the two connecting members, the first clasping ring 10 is uniformly provided with a plurality of connecting holes 12 for connecting the adjusting member 40 in the circumferential direction, the first clasping ring 10 has an outer wall surface 102 and an inner wall surface 103, and the connecting holes 12 penetrate through from the outer wall surface 102 to the inner wall surface 103 to communicate with the first clasping space 101, so that the adjusting member 40 can abut against one of the connecting members in the first clasping space 101, so as to achieve the purpose of adjusting the center axis position of the connecting member to ensure coaxiality when the adjusting member 40 is radially adjusted, and quick installation and adjustment can be achieved without reinstallation, thereby saving workload.

For convenience of observation, the first clasping ring 10 is further provided with an observation window 13 penetrating from the outer wall surface 102 to the first clasping space 101, and based on the arrangement of the observation window 13, whether the two connecting pieces are installed in place can be observed. In an exemplary embodiment of the present disclosure, the observation window 13 is in a pentagram shape, so that the industrial appearance is attractive and the process ornamental value is improved on the basis of realizing the observation function. It should be understood that the shape of the viewing window 13 is not limited to a pentagram, but may be triangular, circular, crescent, etc., as long as it is possible to see through the viewing window 13 whether the two connectors are in place.

Referring to fig. 1, 2 and 6 in combination, in an exemplary embodiment of the present disclosure, a fixing member 50 is connected to the first clasp 10, the fixing member 50 has a positioning shoulder 511, and one of the two connecting members is axially positioned by the positioning shoulder 511. The fixing member 50 may also adopt a split structure, and for the structure shown in fig. 1 and fig. 2, the fixing member 50 includes two third split members 51, the two third split members 51 may be the same or different in size, each third split member 51 has a connecting portion 512 in addition to the arc-shaped positioning shoulder 511, and the connecting portion 512 may be connected with the first connecting ear 16 on the first split member 11. It should be understood that the fastener 50 may be any structure that can fix the first clasp 10 in place.

Referring to fig. 3 and 4 again, the lifting lug 14 is arranged on the first clasping ring 10, the lifting lug 14 comprises a first lifting hole 141 and a second lifting hole 142, the first lifting hole 141 is provided with the first lifting hole 141 for accommodating a sling, the first lifting hole 141 is in a hook shape and is provided with an opening, the second lifting hole 142 is a circular hole, and based on the arrangement of the first lifting hole 141 and the second lifting hole 142, when the two connecting pieces are centered and adjusted, the lifting lug can be lifted by means of a lifting tool, so that the operation is convenient, the lifting lug can be lifted longitudinally and transversely.

As shown in fig. 7 to 9, when the centering adjustment mechanism is used for centering adjustment of a seal structure including a labyrinth inner sleeve 300 and a labyrinth outer sleeve 200, the centering adjustment mechanism includes the steps of:

s100, fixing the labyrinth casing 200 in a first enclasping space 101 through a first enclasping ring 10;

s200, fixing the labyrinth inner sleeve 300 in a second enclasping space 201 through a second enclasping ring 20;

s300, moving the labyrinth inner 300 into the inner cavity of the labyrinth outer sleeve 200 along the guide bar 30 by a hoisting tool so that the labyrinth outer sleeve 200 and the labyrinth inner sleeve 300 are coaxially disposed, and finely adjusting a circumferential gap between the labyrinth inner sleeve 300 and the labyrinth outer sleeve 200.

Specifically, the labyrinth casing 200 may be completely covered and fixed by the first clasping ring 10, so that the first clasping ring 10 and the labyrinth casing 200 are fixed to form an integrally formed labyrinth casing component, and then the labyrinth casing component is vertically placed; then, the labyrinth inner sleeve 300 is completely coated and fixed through the second enclasping ring 20 by the same method, so that the second enclasping ring 20 and the labyrinth inner sleeve 300 are fixed into a whole to form a labyrinth inner sleeve component; then, by using hoisting tools such as a crane and an electric block, the inner labyrinth sleeve assembly is slowly moved to the outer labyrinth sleeve assembly along the guide rod 30, and the inner labyrinth sleeve 300 is moved into the inner cavity of the outer labyrinth sleeve 200, so that the inner labyrinth sleeve can play a role in protecting the labyrinth teeth 201 in the outer labyrinth sleeve 200 from colliding due to vertical movement.

This is disclosed based on the setting of the centering adjustment mechanism including first enclasping ring 10, second enclasping ring 20 and guide bar 30, when carrying out labyrinth seal structure's centering adjustment, moves the inside and outside cover of labyrinth along guide bar 30, just can satisfy the requirement of axiality, easy operation, and the human cost has been practiced thrift greatly to the good reliability.

In addition, during the moving process, after the inner and outer labyrinths are determined to be installed in place by observing through the observation window 13, the outer labyrinths 200 and the inner labyrinths 300 are respectively fixed at two ends of the guide rod 30 by using the first fastening piece 31 and the second fastening piece 32, the first fastening piece 31 can adopt a screw or a bolt, and similarly, the second fastening piece 32 can adopt a screw or a bolt.

In addition, a fixing bracket (not shown in the figure) can be installed in place by using tools such as a theodolite and a level (the place where the inner and outer casings of the labyrinth need to be finally located) and then the inner and outer casings of the labyrinth are integrally and horizontally hoisted to the fixing bracket by using hoisting tools such as a crane and an electric hoist and the lifting lugs 14, and then the labyrinth outer casing 200 is fixed by using the fixing piece 50.

In an embodiment of the present disclosure, in the step of fine adjusting the circumferential gap between the inner labyrinth sleeve 300 and the outer labyrinth sleeve 200, the plurality of adjusting members 40 uniformly arranged in the circumferential direction of the first clasp ring 10 are radially adjusted until the coaxiality of the inner labyrinth sleeve 300 and the outer labyrinth sleeve 200 meets the requirement. Specifically, according to the coaxiality requirement, whether the circumferential clearance of the inner and outer sleeves of the labyrinth is qualified or not can be measured by using the feeler gauge, if the requirement is not met, the plurality of adjusting pieces 40 in the circumferential direction can be radially adjusted one by one until the coaxiality of the inner and outer sleeves of the labyrinth meets the experimental requirement.

After the coaxiality of the inner sleeve and the outer sleeve of the labyrinth meets the requirement, the first enclasping ring 10, the second enclasping ring 20 and the fixing piece 50 can be disassembled, and finally the aim of installing and adjusting the centering adjusting mechanism is achieved.

In summary, it can be seen that the present disclosure has the following advantages:

1. based on the arrangement of the guide rod 30, the requirement of the labyrinth sealing mechanism on the coaxiality of the inner sleeve and the outer sleeve of the labyrinth in the installation process can be met.

2. The first clasp 10, the second clasp 20 and the fixing piece 50 are of split structures, and are convenient to disassemble.

3. The circumferential clearance is finely adjusted through the adjusting piece 40, so that quick installation and adjustment can be realized, reinstallation is not needed, and the workload is saved.

4. The five-pointed star observation window 13 has an attractive and elegant industrial appearance on the basis of realizing the observation function, and improves the process ornamental value.

5. The lifting lug 14 comprising the first lifting hole 141 and the second lifting hole 142 is convenient to install and can be installed longitudinally and transversely.

6. The adaptability is strong, and besides the labyrinth seal structure, other occasions needing centering can be also suitable, for example, the centering device can be used for missile test beds, pipelines, wind tunnels and other related test beds.

In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the orientation terms is generally based on the orientation or positional relationship shown in the drawings, and is for convenience only to facilitate the description of the present disclosure and to simplify the description, and in the case of not having been stated to the contrary, these orientation terms are not intended to indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be taken as limiting the scope of the present disclosure; the terms "inner" and "outer" refer to the interior and exterior relative to the contours of the components themselves.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe the spatial relationship of one or more components or features shown in the figures to other components or features. It is to be understood that the spatially relative terms are intended to encompass not only the orientation of the component as depicted in the figures, but also different orientations of the component in use or operation. For example, if an element in the drawings is turned over in its entirety, the articles "over" or "on" other elements or features will include the articles "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". Further, these components or features may also be positioned at various other angles (e.g., rotated 90 degrees or other angles), all of which are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, elements, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in sequences other than those illustrated or otherwise described herein.

The present disclosure has been illustrated by the above-described embodiments, but it should be understood that the above-described embodiments are for purposes of illustration and description only and are not intended to limit the present disclosure to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, and that many variations and modifications may be made in light of the teaching of the present disclosure, all of which fall within the scope of the claimed disclosure. The scope of the disclosure is defined by the appended claims and equivalents thereof.

Claims

1. A centering adjusting mechanism is used for centering two connecting pieces, and is characterized by comprising a first clasping ring (10), a second clasping ring (20) and a guide rod (30);

the first clasp ring (10) and the second clasp ring (20) are respectively connected to two ends of the guide rod (30), and the positions of the first clasp ring and the second clasp ring are adjustable along the guide rod (30);

wherein, first enclasping ring (10) are formed with first enclasping space (101), second enclasping ring (20) are formed with second enclasping space (201), the central axis in first enclasping space (101) with the central axis in second enclasping space (201) passes through the axiality is injectd in guide bar (30).

2. Centering adjustment mechanism according to claim 1, characterized in that the first clasp (10) comprises at least two first split parts (11), at least two of the first split parts (11) enclosing to form the first clasping space (101); the second enclasping ring (20) comprises at least two second split pieces (21), and at least two second split pieces (21) enclose to form the second enclasping space (201).

3. Centering adjustment mechanism according to claim 2, characterized in that the first clasping ring (10) is split into two first split parts (11) with the same size in the diameter direction, and the two first split parts (11) are connected with each other by a fastener.

4. Centering adjustment mechanism according to claim 2, characterized in that the second clasping ring (20) is split into two second split pieces (21) with the same size in the diameter direction, and the two second split pieces (21) are connected with each other by a fastener.

5. Centering adjustment mechanism according to claim 1, characterized in that the first clasping ring (10) is evenly provided with a plurality of connection holes (12) for connecting an adjusting member (40) in the circumferential direction, the first clasping ring (10) has an outer wall surface (102), and the connection holes (12) penetrate from the outer wall surface (102) to the first clasping space (101).

6. A centering adjustment mechanism according to claim 5, characterized in that the first clasp (10) is further provided with an observation window (13) penetrating from the outer wall surface (102) to the first clasp space (101).

7. Centering adjustment mechanism according to claim 1, characterized in that a fixing piece (50) is connected to the first clasp (10), the fixing piece (50) having a positioning shoulder (511), one of the two connectors being axially positioned by means of the positioning shoulder (511).

8. A centering adjustment mechanism according to any one of claims 1 to 7, wherein a lifting lug (14) is provided on the first clasping ring (10), the lifting lug (14) comprises a first lifting hole (141) and a second lifting hole (142), the first lifting hole (141) is in a hook shape and has an opening, and the second lifting hole (142) is a circular hole.

9. A centering adjustment method of a labyrinth seal, characterized in that a labyrinth seal comprising an inner labyrinth sleeve (300) and an outer labyrinth sleeve (200) is centered by the centering adjustment mechanism of any one of claims 1 to 8, comprising the steps of:

the labyrinth outer sleeve (200) is fixed in the first enclasping space (101) through the first enclasping ring (10);

the labyrinth inner sleeve (300) is fixed in the second enclasping space (201) through a second enclasping ring (20);

the inner labyrinth sleeve (300) is moved into the inner cavity of the outer labyrinth sleeve (200) along the guide rod (30) through a hoisting tool so that the outer labyrinth sleeve (200) and the inner labyrinth sleeve (300) are coaxially arranged, and the circumferential gap between the inner labyrinth sleeve (300) and the outer labyrinth sleeve (200) is finely adjusted.

10. The centering adjustment method according to claim 9, wherein in the step of fine adjusting the circumferential clearance between the inner labyrinth sleeve (300) and the outer labyrinth sleeve (200), the plurality of adjustment members (40) uniformly arranged in the circumferential direction of the first clasp ring (10) are radially adjusted until the coaxiality of the inner labyrinth sleeve (300) and the outer labyrinth sleeve (200) is satisfied.