CN111075928A

CN111075928A - Radial floating type labyrinth seal between rotating part and static part

Info

Publication number: CN111075928A
Application number: CN201911337615.2A
Authority: CN
Inventors: 何小龙; 叶学金; 姜福银; 胡鹏林
Original assignee: Mcquay Air Conditioning Refrigeration Suzhou Co Ltd
Current assignee: Mcquay Air Conditioning Refrigeration Suzhou Co Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-04-28
Anticipated expiration: 2039-12-23
Also published as: CN111075928B

Abstract

A radial floating labyrinth seal between a rotating member and a stationary member, comprising the rotating member and the stationary member, characterized in that: an annular mounting seat is arranged on the periphery of the static element, and an annular floating gap is reserved between the mounting seat and the static element, so that the static element can float radially in the annular floating gap. Then evenly set up at least three radial adjustable elastic support structure in the circumferencial direction between mount pad and stationary part, every radial adjustable elastic support structure comprises depression bar, first spring and radial plug screw connection at least. When the rotating part fluctuates or jumps in the radial direction due to reasons such as inertia, gravity, dynamic and static balance and the like, the static part adapts to the fluctuation or the jump of the rotating part through following radial floating under the help of the radial adjustable elastic supporting structure, so that the coaxiality of the rotating part and the static part in the operation is better ensured.

Description

Radial floating type labyrinth seal between rotating part and static part

Technical Field

The invention belongs to the technical field of sealing structures, and particularly relates to a radial floating type labyrinth seal between a rotating part and a static part.

Background

In mechanical devices and equipment, it is often necessary to provide a seal structure between a rotating member (rotating shaft or rotor) and a stationary member (housing or base) to satisfy the sealing requirements. In some cases, not only is there a sealing requirement between the rotating member and the stationary member, but the sealing requirement is also high. For example, in a centrifugal compressor in a fluid machine, an impeller is a rotating member, one side of the impeller is a high pressure chamber, and the other side of the impeller is a low pressure chamber, and the high pressure chamber and the low pressure chamber form a pressure difference in an axial direction, so that a seal needs to be applied between an impeller shaft and a seat body, thereby performing a sealing function in front of and behind the impeller.

Labyrinth seal refers to a seal having a plurality of tortuous chambers between the rotating and stationary components to minimize leakage. The sealing medium passes through the gap of the zigzag labyrinth to produce throttling effect and thus to block leakage. Because the clearance exists between the rotating part and the static part of the labyrinth seal, the labyrinth seal has no solid contact, does not need lubrication, allows thermal expansion, adapts to the occasions of high temperature, high pressure and high rotating speed frequency, and is widely used for sealing shaft ends and all stages of steam turbines, gas turbines, compressors and blowers.

In the prior art, the radial labyrinth seal between the rotating and stationary parts is theoretically as small as possible. The size of the gap at this point of timing for the fluid machine (such as a refrigeration compressor) directly affects the amount of energy loss of the fluid machine. However, since the rotor of the refrigeration compressor has large amplitude in the states of starting, stopping, supercritical speed and the like, and is influenced by the processing precision, the assembly precision, the bearing clearance and the like, the labyrinth seal static part and the rotating part are difficult to ensure good coaxiality, if the labyrinth seal clearance is too small, strong friction is generated at the position when the refrigeration compressor runs, the load of a rotating shaft is increased, and the using effect of the labyrinth seal is reduced. In addition, the coaxiality between the rotating shaft and the shell is reduced under the action of gravity when the refrigeration compressor operates, and the abrasion loss is increased. In a word, the floating capacity of the static part along with the rotating part in the radial direction in the existing radial labyrinth seal is poor, and the coaxiality of the rotating part and the static part is difficult to guarantee in operation.

In view of the above, the present invention is to design a radial floating type labyrinth seal that not only has a small labyrinth seal clearance, but also can maintain a better coaxiality between the stationary member and the rotating member.

Disclosure of Invention

The invention provides a radial floating type labyrinth seal between a rotating part and a static part, and aims to solve the problems that the radial floating capability of the static part along with the rotating part is poor in the existing radial labyrinth seal, and the coaxiality of the rotating part and the static part is difficult to guarantee in operation.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a radial floating labyrinth between rotating member and the stationary part, includes rotating member and stationary part, wherein, rotating member and a pivot fixed connection, the pivot is rotated the support by the bearing, is equipped with the excircle section that is used for sealing on the rotating member, is equipped with the interior circle section that is used for sealing on the stationary part, under the assembled condition excircle section and the cooperation of interior circle section are equipped with the labyrinth between the fitting surface and seal the profile of tooth structure, and its innovation lies in:

an annular mounting seat is arranged on the periphery of the static part, and an annular floating gap is reserved between the mounting seat and the static part, so that the static part can float in the annular floating gap in the radial direction.

At least three radial adjustable elastic supporting structures are arranged between the mounting seat and the static part at intervals in the circumferential direction, and each radial adjustable elastic supporting structure comprises a pressure lever, a first spring and a radial screw plug; a radial mounting hole is formed in the mounting seat corresponding to the radial adjustable elastic supporting structure, the radial mounting hole is formed along the annular radial through of the mounting seat, and the radial mounting hole is provided with an inner end and an outer end; one end of the pressure lever is positioned in the inner end of the radial mounting hole and is in sliding fit with the radial mounting hole, and the other end of the pressure lever is pressed against the outer edge of the static part; the radial screw plug is positioned in the outer end of the radial mounting hole and is in threaded fit with the outer end of the radial mounting hole; the first spring is located in the radial mounting hole and located between the pressure rod and the radial screw plug.

The relevant content in the above technical solution is explained as follows:

1. in the above scheme, an axial pressure adjusting structure may be provided for the radially adjustable elastic support structure, and the axial pressure adjusting structure includes a radial slider, an axial slider, a push rod, and an axial plug screw; an axial mounting hole is formed in the mounting seat corresponding to the axial pressure adjusting structure, the axial mounting hole is formed in the annular axial direction of the mounting seat and is provided with an inner end and an outer end, and the inner end of the axial mounting hole is communicated with the radial mounting hole in an inertial mode; the radial slide block is provided with a first inclined plane, the axial slide block is provided with a second inclined plane, the radial slide block and the axial slide block are both located in the radial mounting hole and are arranged between the first spring and the radial screw plug, the first inclined plane of the radial slide block is in contact fit with the second inclined plane of the axial slide block, and the axial slide block is located at the position where the radial mounting hole is communicated with the axial mounting hole; the axial screw plug is positioned in the outer end of the axial mounting hole and is in threaded fit with the outer end of the axial mounting hole; the push rod is located in the axial mounting hole and acts between the axial screw plug and the axial sliding block.

2. In the above scheme, the radially adjustable elastic support structure may further include a piston and a pressure sensor, the piston and the pressure sensor are located in the radial mounting hole after being stacked and combined, and are located between the first spring and the radial slider or the axial slider, wherein the piston contacts the first spring; the push rod adopts electric putter, and electric putter's preceding is equipped with the second spring, and the one end of second spring is supported and is leaned on the step face of axial mounting hole inner, and the other end of second spring supports and leans on electric putter's casing, and electric putter's catch bar stretches out and acts on the axial slider from the casing.

3. In the above scheme, an annular seat bin matched with the static part in shape is arranged on the annular mounting seat, one end of the annular seat bin is an open end, the other end of the annular seat bin is provided with an inner end face, the static part is an annular component, end faces are respectively arranged at two ends of the annular component, the static part is installed into the annular seat bin of the mounting seat from the open end of the annular seat bin of the mounting seat in an assembly state, one end face of the static part abuts against the inner end face of the annular seat bin, a pressing plate is arranged at the open end of the annular seat bin of the mounting seat, the pressing plate is fixedly connected with the mounting seat, an elastic pressing part is arranged between the pressing plate and the other end face of the static part, and the static part is pressed on the mounting seat from the axial direction.

The design principle of the invention is as follows: in order to solve the problems that the radial floating capacity of a static part along with a rotating part is poor in the existing radial labyrinth seal, and the coaxiality of the rotating part and the static part is difficult to guarantee in operation, the invention firstly arranges an annular mounting seat at the periphery of the static part, and an annular floating gap is reserved between the mounting seat and the static part, so that the static part can float radially in the annular floating gap. Then evenly set up at least three radial adjustable elastic support structure in the circumferencial direction between mount pad and stationary part, every radial adjustable elastic support structure comprises depression bar, first spring and radial plug screw connection at least. When the rotating part fluctuates or jumps in the radial direction due to reasons such as inertia, gravity, dynamic and static balance and the like, the static part adapts to the fluctuation or the jump of the rotating part through following radial floating under the help of the radial adjustable elastic supporting structure, so that the coaxiality of the rotating part and the static part in the operation is better ensured.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages and effects:

1. according to the invention, as the static part is uniformly provided with at least three radial adjustable elastic supporting structures in the circumferential direction, the influence of gravity on the abrasion of the static part in the radial floating type labyrinth seal is reduced, and the abrasion of the static part which falls down due to gravity and vibration and finally is abraded with the rotating part is greatly reduced.

2. Because the static part is uniformly provided with at least three radial adjustable elastic supporting structures in the circumferential direction, when the rotating part fluctuates or jumps in the radial direction due to the reasons of inertia, gravity, dynamic and static balance and the like, the static part can adapt to the fluctuation or the jump of the rotating part through following radial floating, so that the rotating part and the static part can be kept to have better coaxiality in operation, and friction between the sealing surfaces of the rotating part and the static part is avoided.

3. The axial pressure adjusting structure is further arranged on the radial adjustable elastic supporting structure, and when the radial screw plug is interfered or shielded due to structural design, the pressure of the compression bar can be adjusted through the axial screw plug.

4. The radial and axial adjustable elastic support structure and the axial pressure adjusting structure are matched through the two inclined planes of the radial sliding block and the axial sliding block, so that the problem that the radial and axial directions are independently adjustable is solved ingeniously, the radial adjustment and the axial adjustment can be independently adjusted and do not interfere with each other, and great convenience is brought to installation and debugging and future use and operation.

5. According to the invention, the pressure sensor is arranged in the radial adjustable elastic supporting structure, the electric push rod is arranged in the axial pressure adjusting structure, under the coordination of an electric appliance control system, the size of the spring force measured by the pressure sensor can be calculated and known according to the position of the electric push rod (when the labyrinth seal static part is not in contact with the rotating part), and if the calculated value is deviated from the actually measured value and the resultant force A of the spring force is not equal to the gravity G, the labyrinth seal rotating part is deviated from the center again, so that the automatic detection and control are realized.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

FIG. 3 is an enlarged view of FIG. 2 at B;

fig. 4 is an enlarged view of fig. 3 at C.

In the above drawings: 1. a rotating member; 2. a stationary member; 3. a mounting seat; 4. a body; 5. a bolt; 6. a wave spring; 7. pressing a plate; 8. a pressure lever; 9. a first spring; 10. a second spring; 11. an electric push rod; 12. an axial plug screw; 13. a piston; 14. a pressure sensor; 15. a radial slider; 16. an axial slide block; 17. a radial plug screw; an "O" ring seal; 19. a rotating shaft; 20. a bearing; 21. a radial mounting hole; 22. an axial mounting hole; 23. an inner end surface.

Detailed Description

The invention is further described with reference to the following figures and examples:

example (b): radial floating type labyrinth seal between rotating part and static part

As shown in fig. 1-4, the radial floating labyrinth seal comprises a rotating member 1 and a stationary member 2 (see fig. 1), wherein the rotating member 1 is fixedly connected with a rotating shaft 19, and the rotating shaft 19 is rotatably supported by a bearing 20 (see fig. 1). The rotating part 1 is provided with an excircle section for sealing, the stationary part 2 is provided with an inner circle section for sealing, the excircle section is matched with the inner circle section in an assembling state, and a labyrinth seal tooth-shaped structure is arranged between matching surfaces (see figure 2).

An annular mounting seat 3 (see fig. 1) is arranged on the periphery of the static element 2, and an annular floating gap is reserved between the mounting seat 3 and the static element 2 so that the static element 2 can radially float in the annular floating gap.

Four radial adjustable elastic supporting structures are uniformly arranged between the mounting seat 3 and the static part 2 in the circumferential direction, and each radial adjustable elastic supporting structure comprises a pressure lever 8, a first spring 9 and a radial screw plug 17 (see fig. 3 and 4). A radial mounting hole 21 (see fig. 4) is formed in the mounting base 3 corresponding to the radial adjustable elastic support structure, the radial mounting hole 21 is formed along the annular radial through of the mounting base 3, and the radial mounting hole 21 has an inner end and an outer end. One end of the strut 8 is seated in the inner end of the radial mounting hole 21 and is in sliding fit with respect to the radial mounting hole 21, and the other end of the strut 8 bears against the outer edge of the stationary member 2 (see fig. 2 and 3). The radial plug 17 is located in the outer end of the radial mounting hole 21 and is threadedly engaged with the outer end of the radial mounting hole 21 (see fig. 3 and 4). The first spring 9 is seated in the radial mounting hole 21 and is located between the pressure rod 8 and the radial screw 17.

An axial pressure adjustment structure is provided for the radially adjustable elastic support structure, which includes a radial slider 15, an axial slider 16, a push rod, and an axial plug screw 12 (see fig. 3 and 4). An axial mounting hole 22 (see fig. 4) is formed in the mounting seat 3 corresponding to the axial pressure adjusting structure, the axial mounting hole 22 is formed along the annular axial direction of the mounting seat 3 and has an inner end and an outer end, and the inner end of the axial mounting hole 22 is communicated with the radial mounting hole 21 (see fig. 4). The radial slider 15 is provided with a first inclined surface, the axial slider 16 is provided with a second inclined surface (see fig. 4), the radial slider 15 and the axial slider 16 are both located in the radial mounting hole 21 and are arranged between the first spring 9 and the radial screw plug 17, wherein the first inclined surface of the radial slider 15 is in contact fit with the second inclined surface of the axial slider 16, and the axial slider 16 is located at a position where the radial mounting hole 21 and the axial mounting hole 22 are communicated (see fig. 4). The axial plug 12 is located in the outer end of the axial mounting hole 22 and is threadedly engaged with the outer end of the axial mounting hole 22 (see fig. 3). The push rod is seated in the axial mounting hole 22 and acts between the axial screw 12 and the axial slider 16 (see fig. 3).

The radially adjustable elastic support structure further comprises a piston 13 and a pressure sensor 14 (see fig. 4), the piston 13 and the pressure sensor 14 are seated in the radial mounting hole 21 after being overlapped and combined and are located between the first spring 9 and the radial slider 1, wherein the piston 13 contacts the first spring 9 (see fig. 4). The push rod adopts an electric push rod 11 (see fig. 3 and 4), a second spring 10 is arranged in the forward direction of the electric push rod 11, one end of the second spring 10 abuts against a step surface at the inner end of the axial mounting hole 22 (see fig. 4), the other end of the second spring 10 abuts against a shell of the electric push rod 11, and a push rod of the electric push rod 11 extends out of the shell and acts on the axial sliding block 16 (see fig. 4).

The annular mounting seat 3 is provided with an annular seat bin (shown in figure 1) matched with the static part 2 in shape, one end of the annular seat bin is an open end, the other end of the annular seat bin is provided with an inner end surface 23 (shown in figure 1), the static part 2 is an annular component, the two ends of the annular component are respectively provided with end surfaces, the static part 2 is installed into the annular seat bin of the mounting seat 3 from the open end of the annular seat bin of the mounting seat 3 in an assembly state, one end surface of the static part 2 is attached to the inner end surface 23 of the annular seat bin, the open end of the annular seat bin of the mounting seat 3 is provided with a pressing plate 7 (shown in figures 1, 2 and 3), the pressing plate 7 is fixedly connected with the machine body 4 through bolts 5, a wave spring 6 is arranged between the pressing plate 7 and the other end surface of the static part 2, and the static part 2 is pressed on the mounting seat 3 in the axial direction (. An O-ring 18 (see fig. 2) is arranged between one end face of the stationary part 2 and the inner end face 23 of the annular housing to be attached. The O-ring 18 is designed to seal between the end face of the stationary member 2 and the inner end face 23 of the annular housing.

In order to realize automatic detection and control by matching with the invention, a matched electric appliance control system is also required to be arranged. The electrical appliance control system can be designed by adopting the prior art according to different requirements. As will be understood and accepted by those skilled in the art, and therefore, will not be described in detail herein.

The specific implementation process of the embodiment is as follows:

1. during assembly and debugging of the embodiment, the static part 2 of the labyrinth seal is coaxial with the theoretical rotary axis of the rotating part 1 of the labyrinth seal by adjusting the axial screw plug 12 or the radial screw plug 17. Meanwhile, the compression amount of the first spring 9 and the second spring 10 is required to be ensured within a certain reasonable range, the pressure feedback value of each pressure sensor 14 is recorded and is recorded into an electrical appliance control system, and the feedback force value A of each pressure sensor 14 is equal to the gravity G of the labyrinth seal static piece 2 in size and opposite in direction, namely A = -G.

2. When the operation of this embodiment is carried out, when labyrinth seal rotating member 1 deviates from its theoretical centre of rotation, the sealed face of rotating member 1 contacts with the sealed face of stationary member 2, and each pressure sensor 14 of labyrinth seal stationary member 2 excircle detects pressure variation, and electrical apparatus control system learns the direction and the size of pressure sensor 14 resultant force value through calculation to control electric putter 11 action, make resultant force value A = -G and let electric putter 11 move a small segment distance again and thereby guarantee that labyrinth seal clearance volume is even.

2. In the operation process of the present embodiment, the electrical control system can calculate and know how much the spring force measured by the pressure sensor 14 should be (when the labyrinth seal stationary member 2 is not in contact with the rotating member 1) according to the position of the electric push rod 11, and if the calculated value deviates from the actually measured value and the resultant force a of the spring force is not equal to the gravity G, it indicates that the labyrinth seal rotating member deviates from the center again, thereby implementing automatic detection and control.

Other embodiments and structural variations of the present invention are described below:

1. in the above embodiments, the electric push rod 11 is an electric driving device that converts the rotary motion of the electric motor into the linear reciprocating motion of the push rod, also called a linear driver, and is a novel linear actuator mainly composed of the motor push rod and a control device, and can be considered as an extension of the rotary motor in terms of structure.

2. In the above embodiment, four radially adjustable elastic support structures are uniformly arranged between the mounting seat 3 and the stationary member 2 in the circumferential direction. However, the present invention is not limited thereto, and it is theoretically possible that the number of the radially adjustable elastic support structures is at least three, and the radially adjustable elastic support structures are arranged at intervals. Uniform placement is a preferred implementation and not a necessary condition. The skilled person will thus appreciate that the radially adjustable resilient support structures may be three, four, five, six, seven, eight or even more in number and may be circumferentially spaced. As would be readily understood and accepted by those skilled in the art.

3. In the above embodiment, after the radial slider 15 is in contact fit with the inclined surface of the axial slider 16, the flat surface of the radial slider 15 is in contact with the first spring 9, and the flat surface of the axial slider 16 is in contact with the radial plug 17 (see fig. 4). However, the invention is not limited to this, and the positions of the radial slider 15 and the axial slider 16 can be exchanged, i.e. the plane of the axial slider 16 is in contact with the first spring 9, and the plane of the radial slider 15 is in contact with the radial plug 17, in reverse, to achieve the object of the invention and to obtain the same technical result. As would be readily understood and accepted by those skilled in the art.

4. In the above embodiment, the elastic pressing member is a wave spring 6 (see fig. 1 and 2). However, the present invention is not limited thereto, and theoretically, the present invention can be implemented as a spring-loaded member or structure. As would be readily understood and accepted by those skilled in the art.

5. In the above embodiments, "the rotating member 1 is provided with an outer circle section for sealing, the stationary member 2 is provided with an inner circle section for sealing, the outer circle section and the inner circle section are matched in an assembled state, and a labyrinth seal tooth profile structure (see fig. 2) is provided between the matching surfaces", but the specific structure of the labyrinth seal tooth profile is not described in further detail. This is because the labyrinth seal tooth structure belongs to the prior art. The present invention is not limited to the case shown in the drawings, and any labyrinth seal tooth structure described in the prior art may be applied to the present invention. As would be readily understood and accepted by those skilled in the art.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a radial floating labyrinth seal between rotating member and stationary part, includes rotating member (1) and stationary part (2), wherein, rotating member (1) and a pivot (19) fixed connection, pivot (19) are rotated the support by bearing (20), are equipped with the excircle section that is used for sealing on rotating member (1), are equipped with on stationary part (2) to be used for the sealed interior circle section, under assembled condition the cooperation of excircle section and interior circle section is equipped with labyrinth seal tooth profile structure, its characterized in that between the fitting surface:

an annular mounting seat (3) is arranged on the periphery of the static part (2), and an annular floating gap is reserved between the mounting seat (3) and the static part (2) so that the static part (2) can float in the annular floating gap in the radial direction;

at least three radial adjustable elastic supporting structures are arranged between the mounting seat (3) and the static part (2) at intervals in the circumferential direction, and each radial adjustable elastic supporting structure comprises a pressure lever (8), a first spring (9) and a radial screw plug (17); a radial mounting hole (21) is formed in the mounting seat (3) corresponding to the radial adjustable elastic supporting structure, the radial mounting hole (21) is formed along the annular radial through of the mounting seat (3), and the radial mounting hole (21) is provided with an inner end and an outer end; one end of the pressure lever (8) is positioned in the inner end of the radial mounting hole (21) and is in sliding fit with the radial mounting hole (21), and the other end of the pressure lever (8) is pressed against the outer edge of the static part (2); the radial screw plug (17) is positioned in the outer end of the radial mounting hole (21) and is in threaded fit with the outer end of the radial mounting hole (21); the first spring (9) is located in the radial mounting hole (21) and is located between the pressure rod (8) and the radial screw plug (17).

2. The radial floating labyrinth seal of claim 1, wherein: an axial pressure adjusting structure is arranged aiming at the radial adjustable elastic supporting structure, and comprises a radial sliding block (15), an axial sliding block (16), a push rod and an axial screw plug (12); an axial mounting hole (22) is formed in the mounting seat (3) corresponding to the axial pressure adjusting structure, the axial mounting hole (22) is formed in the annular axial direction of the mounting seat (3) and is provided with an inner end and an outer end, and the inner end of the axial mounting hole (22) is communicated with the radial mounting hole (21) in an inertial mode; the radial sliding block (15) is provided with a first inclined surface, the axial sliding block (16) is provided with a second inclined surface, the radial sliding block (15) and the axial sliding block (16) are both located in the radial mounting hole (21) and are arranged between the first spring (9) and the radial screw plug (17), wherein the first inclined surface of the radial sliding block (15) is in contact fit with the second inclined surface of the axial sliding block (16), and the axial sliding block (16) is located at the position where the radial mounting hole (21) and the axial mounting hole (22) are communicated; the axial screw plug (12) is positioned in the outer end of the axial mounting hole (22) and is in threaded fit with the outer end of the axial mounting hole (22); the push rod is seated in the axial mounting hole (22) and acts between the axial plug screw (12) and the axial slider (16).

3. The radial floating labyrinth seal of claim 2, wherein: the radial adjustable elastic supporting structure comprises a piston (13) and a pressure sensor (14), the piston (13) and the pressure sensor (14) are arranged in a radial mounting hole (21) after being overlapped and combined, and are positioned between a first spring (9) and a radial sliding block (15) or an axial sliding block (16), wherein the piston (13) is in contact with the first spring (9); the push rod adopts electric putter (11), and electric putter (11) are preceding to be equipped with second spring (10), and the one end of second spring (10) is supported and is leaned on the step face at axial mounting hole (22) inner, and the other end of second spring (10) supports and leans on electric putter (11)'s casing, and electric putter (11) catch bar stretches out and acts on axial slider (16) from the casing.

4. The radial floating labyrinth seal of claim 1, wherein: the annular mounting seat is characterized in that an annular seat bin matched with the static part (2) in shape is arranged on the annular mounting seat (3), one end of the annular seat bin is an open end, an inner end face (23) is arranged at the other end of the annular mounting seat bin, the static part (2) is an annular component, end faces are arranged at two ends of the annular component respectively, the static part (2) is installed into the annular seat bin of the mounting seat (3) from the open end of the annular seat bin of the mounting seat (3) in an assembly state, one end face of the static part (2) is attached to the inner end face (23) of the annular seat bin, a pressing plate (7) is arranged at the open end of the annular seat bin of the mounting seat (3), the pressing plate (7) is fixedly connected with the mounting seat (3) relatively, an elastic pressing part is arranged between the pressing plate (7) and the other end face of the static part (2), and the static part (2) is pressed on the mounting seat (3) in.

5. The radial floating labyrinth seal of claim 4, wherein: the elastic pressing piece adopts a wave spring (6), and an O-shaped sealing ring (18) is arranged between one end face of the static piece (2) and the inner end face (23) of the attached annular seat bin.