A hanger

Abstract

This invention belongs to the field of oil and gas field cementing tool technology, specifically relating to a hanger. The hanger includes: a body; a mounting assembly disposed on the outside of the body; and a drive assembly disposed on the outside of the body. The drive assembly is configured to generate high-pressure gas in response to a mounting signal, and under the action of the high-pressure gas, the mounting assembly completes the mounting process. The high-pressure gas generates a large instantaneous thrust, therefore the thrust experienced by the mounting assembly is greater and faster than conventional mounting methods, resulting in faster overall mounting efficiency and a more secure mounting.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas field cementing tool technology, specifically, it relates to a hanger. Background Technology

[0002] As global exploration and development technologies continue to push towards deeper and deeper water exploration, and some blocks begin to adopt integrated cementing and completion processes involving tailpipe cementing followed by uncemented fracturing, the complex downhole environment with high temperature, high pressure, and high sulfur content places increasingly higher demands on the pressure resistance and long-term sealing of tailpipe cementing tools. The higher pressure during later fracturing operations also presents new challenges to the overall pressure resistance of the tailpipe hanger.

[0003] Meanwhile, the large-scale construction of energy storage facilities and other facilities, coupled with the high injection and extraction requirements and long service life requirements of gas storage wells, necessitates a high degree of reliance on the integrity of the wellbore. However, most existing tailpipe hangers integrate the power hydraulic cylinder into the hanger unit, which remains downhole with the tailpipe after cementing. This poses a risk of aging, seal failure, and leakage in the elastomeric seals at the power hydraulic cylinder, potentially leading to annular gas leakage or, in severe cases, blowouts and the abandonment of a single well.

[0004] Therefore, there is an urgent need to develop a suspension system that can solve the above-mentioned technical problems. Summary of the Invention

[0005] In view of the technical problems described above, the present invention aims to provide a suspension device that can solve at least one of the aforementioned technical problems.

[0006] According to the present invention, a hanger is provided, comprising: ontology; A seat-hanging assembly disposed on the outside of the main body; A drive assembly disposed on the outside of the main body is configured to generate high-pressure gas in response to a seating signal, and to enable the seating assembly to complete seating under the action of the high-pressure gas.

[0007] In one specific embodiment, the driving component includes: The drive housing is located on the outside of the main body; A pusher element movably disposed axially within the drive housing for adaptation to the seat assembly; A signal receiving unit for receiving seat signals is disposed on the drive housing; The reactant disposed within the drive housing is configured to generate high-pressure gas in response to the signal receiving unit. The high-pressure gas drives the pusher to move axially relative to the drive housing, thereby enabling the seat assembly to complete the seat mounting.

[0008] In one specific embodiment, the drive housing includes: outer shell; An inner housing is coaxially spaced within the outer housing, forming a drive cavity between the outer housing and the inner housing; An end housing is disposed at the end of the outer shell and the inner shell to seal the drive cavity, the end housing being located at the end of the drive cavity away from the seat assembly; The pusher is axially movable and sealed within the drive cavity, and the reactant is located between the pusher and the end housing.

[0009] In one specific embodiment, the seat-hanging assembly includes a cone sleeve, a locking clip, and a support sleeve coaxially arranged from top to bottom on the outer side of the body. The drive assembly is located above the cone sleeve, and the lower end of the pusher of the drive assembly is connected to the cone sleeve.

[0010] In one specific embodiment, the conical sleeve is connected to the body via a third shear pin, the support sleeve is connected to the body via a first shear pin, and a shear pin sleeve is coaxially provided on the outside of the body via a second shear pin, with the shear pin sleeves spaced apart below the support sleeve.

[0011] In one specific embodiment, the pusher and the cone sleeve are connected by an anti-reverse locking unit configured to prevent the cone sleeve and the pusher from moving upward relative to the body.

[0012] In one specific embodiment, the anti-reverse locking unit includes: A load-transfer sleeve is fixedly installed at the lower end of the pusher; A retaining ring sleeve is fixedly installed at the lower end of the transmission sleeve. A first retaining ring is provided on the inner wall of the retaining ring sleeve, and a one-way ratchet adapted to the first retaining ring is provided on the outer wall of the body. A connecting sleeve is fixedly installed at the lower end of the snap ring sleeve, and the connecting sleeve abuts axially with the tapered sleeve.

[0013] In one specific embodiment, the lower end of the load transfer sleeve and the upper end of the snap ring sleeve overlap each other radially, and the radially overlapping portion of the load transfer sleeve and the snap ring sleeve is connected by a first screw. The lower end of the snap ring sleeve and the upper end of the connecting sleeve overlap each other radially, and the radially overlapping portion of the snap ring sleeve and the connecting sleeve is connected by a second screw.

[0014] In one specific embodiment, a third retaining ring is fixedly provided on the outer wall of the body, and the third retaining ring abuts axially with the upper end of the drive assembly.

[0015] In one specific embodiment, a straightening component is provided on the outer wall of the main body, and the straightening component is axially spaced below the seat hanging component.

[0016] Compared with the prior art, this application has at least the following advantages.

[0017] This invention provides a novel seat-mounting drive solution by generating high-pressure gas in response to a seat-mounting signal through a drive component. The high-pressure gas can then drive the seat-mounting component to complete the seat-mounting process.

[0018] The high-pressure gas driving the seat assembly in this invention is generated by activating chemical reactants inside the drive component. This high-pressure gas causes the pusher to move relative to the drive housing towards the seat assembly, thereby propelling the seat assembly to complete the seating process. The high-pressure gas generates a large instantaneous thrust, resulting in a greater and faster thrust on the seat assembly compared to conventional seat assembly solutions, leading to faster overall seating efficiency and a more secure seating arrangement.

[0019] The drive assembly of this invention is coaxially mounted on the outside of the main body. It receives the mounting signal through a signal receiving unit and generates high-pressure gas from the reactants. With this configuration, no through-holes are required on the main body, ensuring long-term sealing of the hanger and the integrity of the tailpipe wellbore. The response of the drive assembly is unaffected by the fluid circulation pressure inside the hanger, eliminating the risk of premature shearing of the shear pins used to fix components due to fluid circulation pressure. This enables unlimited displacement circulation of the tailpipe string, effectively ensuring reliable lowering.

[0020] Compared to the traditional ball-throwing and pressure-pressurizing method, the suspension device in this invention does not need to cooperate with the ball seat and does not require ball-throwing and pressure-pressurizing. This avoids the risk of well leakage caused by the ball seat falling after the ball seat is pressed through, reduces the drill pipe diameter, improves on-site work efficiency, and eliminates the weak links of existing suspension devices.

[0021] This invention enables the signal receiving unit to receive the mounting signal and actively control the mounting timing, which is helpful for cementing work and can avoid premature mounting or mounting failure of the hanger due to excessive mud density or pressure fluctuations during cementing operations. Attached Figure Description

[0022] The invention will now be described with reference to the accompanying drawings.

[0023] Figure 1 A schematic diagram of a suspension device according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of a drive assembly of a suspension according to the present invention is shown.

[0024] The reference numerals in the figure are as follows: 1. Body; 11. Third circlip; 12. Sealing assembly; 2. Seat and hanger assembly; 21. Conical sleeve; 22. Slipper; 23. Support sleeve; 24. First shear pin; 25. Second shear pin; 26. Shear pin sleeve; 27. Third shear pin; 28. First sealing ring; 3. Drive assembly; 31. Drive housing; 311. Outer housing; 312. Inner housing; 313. End housing; 314. Drive cavity; 32. Pushing element; 33. Reactant; 4. Anti-reverse locking unit; 41. Load transfer sleeve; 42. Circlip sleeve; 43. Connecting sleeve; 44. First circlip; 45. First screw; 46. Second screw; 47. Third screw; 48. Second circlip; 5. Centering assembly; 51. Centering element; 52. Threaded retaining ring; 53. Fourth screw; 100. Suspension device.

[0025] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0026] The invention will now be described with reference to the accompanying drawings.

[0027] It should be noted that in this application, the direction indicated by the central axis of the body according to the present invention is described as "axial" or similar, while the direction perpendicular to the central axis of the body is described as "radial" or similar.

[0028] Figure 1 A schematic diagram showing the use of the hanger 100 according to the invention is shown. Figure 1 As shown, the suspension 100 includes a body 1, a seat assembly 2, and a drive assembly 3.

[0029] The main body 1 has a cylindrical structure. The mounting assembly 2 is coaxially mounted on the outside of the main body 1 for mounting on the inner wall of the wellbore. The drive assembly 3 is coaxially mounted on the outside of the main body 1 and located above the mounting assembly 2. The drive assembly 3 is designed to generate high-pressure gas in response to a mounting signal, and under the action of the high-pressure gas, the mounting assembly 2 completes the mounting process.

[0030] In one embodiment, such as Figure 1 and Figure 2 As shown, the drive assembly 3 includes a drive housing 31, a pusher 32, a signal receiving unit, and a reactant 33.

[0031] The drive housing 31 includes an outer shell 311, an inner shell 312, and an end shell 313. Both the outer shell 311 and the inner shell 312 are cylindrical structures, with the outer shell 311 coaxially spaced outside the inner shell 312. That is, the inner diameter of the outer shell 311 is larger than the outer diameter of the inner shell 312, and a radial gap exists between the outer shell 311 and the inner shell 312, forming a drive cavity 314. The end shell 313 is located at the end of the outer shell 311 and the inner shell 312 furthest from the seat assembly 2. Figure 2 The upper end of the drive cavity 314 is blocked away from the seat assembly 2, so that the drive cavity 314 forms a lower end opening (towards the end of the seat assembly 2).

[0032] The pusher 32 is axially movably and sealed within the drive cavity 314. The lower end of the pusher 32 can move downward relative to the drive housing 31 to the outside of the drive cavity 314. The drive housing 31 is fixedly disposed on the outside of the body 1. Specifically, the drive housing 31 is configured to be unable to move upward relative to the body 1 axially. During the downward movement of the lower end of the pusher 32 relative to the drive housing 31 to the outside of the drive cavity 314, it can push the seat assembly 2 to complete the seat mounting.

[0033] The reactant 33 is located within the drive chamber 314 and between the pusher 32 and the end housing 313. The reactant 33 is configured to undergo a chemical reaction to generate high-pressure gas, thereby causing the pusher 32 to move downward relative to the drive housing 31.

[0034] A signal receiving unit is mounted on the drive housing 31 and is electrically connected to the reactant 33. The signal receiving unit receives the mounting signal from the wellhead and activates the reactant 33, causing it to undergo a chemical reaction and generate high-pressure gas. The high-pressure gas causes the pusher 32 to move downwards relative to the drive housing 31, and the pusher 32 pushes the mounting assembly 2 to complete the mounting process.

[0035] In one embodiment, the drive cavity 314 and the pusher 32 are configured as annular structures, with the pusher 32 movably and sealed within the drive cavity 314 along the axial direction. In another embodiment, the drive cavity 314 is configured as a plurality of cavities evenly distributed at intervals along the circumferential direction. Correspondingly, the pusher 32 is configured as a rod shape adapted to the shape of the drive cavity 314, with one pusher 32 movably and sealed within each cavity along the axial direction. The plurality of pushers 32 are evenly distributed around the hanger 100 along the circumferential direction to ensure uniform thrust.

[0036] In one embodiment, reactant 33 can be triggered by an electrical signal, vibration signal, pressure signal, etc., but is not limited to the above methods. That is, the suspension signal received by the signal receiving unit can be an electrical signal, vibration signal, pressure signal, etc. The specific structures of reactant 33 and signal receiving unit are well known to those skilled in the art and will not be described in detail here.

[0037] In one specific embodiment, reactant 33 is gunpowder, and the signal receiving unit is an electronic detonator. The electronic detonator can receive electrical signals from the wellhead wirelessly or via wired means, thereby detonating the gunpowder to generate high-pressure gas.

[0038] In one embodiment, the seat-hanging assembly 2 includes a cone sleeve 21, a slip 22, and a support sleeve 23, which are coaxially arranged on the outside of the body 1 from top to bottom.

[0039] The conical sleeve 21 is circular in shape, and its lower end is constructed with an inclined surface that can be adapted to the slip 22. The conical sleeve 21 is coaxially fixed to the outside of the body 1 by a third shear pin 27. The drive assembly 3 is located above the conical sleeve 21, and the lower end of the pusher 32 of the drive assembly 3 is connected to the conical sleeve 21. Specifically, the lower end of the pusher 32 can push the conical sleeve 21 axially downward. The support sleeve 23 is circular in shape and is coaxially fixed to the outside of the body 1 by a first shear pin 24. The slip 22 is disposed between the conical sleeve 21 and the support sleeve 23. The lower end of the slip 22 abuts axially with the support sleeve 23, and the upper end of the slip 22 is adapted to the inclined surface of the lower end of the conical sleeve 21.

[0040] When the pusher 32 of the drive assembly 3 moves downward relative to the drive housing 31, the pusher 32 can push the cone sleeve 21 downward. When the third shear pin 27 used to fix the cone sleeve 21 breaks, the cone sleeve 21 moves downward relative to the body 1 and the support sleeve 23 under the push of the pusher 32, thereby causing the slip 22 to expand radially and complete the seat hanging.

[0041] In one embodiment, a first sealing ring 28 is provided between the inner wall of the support sleeve 23 and the outer wall of the body 1. The sealing ring 28 mainly serves to prevent sand from clogging and causing difficulty in hanging.

[0042] In one embodiment, a shearing sleeve 26 is coaxially provided on the outside of the body 1 via a second shearing pin 25, and the shearing sleeve 26 is spaced apart below the support sleeve 23.

[0043] If the slip 22 prematurely expands radially and becomes stuck during the insertion of the hanger 100 into the well due to unforeseen circumstances, it can be removed by lifting the main body 1 and using the first shear pin 24 on the fixed support sleeve 23 to cut it, providing space for the slip 22 to move downwards and releasing it from the stuck position. After the hanger 100 has been inserted into the well to the predetermined position, the shear pin sleeve 26 will then act as the original support sleeve 23, allowing the slip 22 to complete the stuck position under the push of the cone sleeve 21.

[0044] In one embodiment, the hanger 100 further includes an anti-reverse locking unit 4 configured to prevent the cone sleeve 21 and the pusher 32 from moving upward relative to the body 1, thereby preventing the seat assembly 2 from resetting after being seated.

[0045] The anti-reverse locking unit 4 is located between the pusher 32 and the cone sleeve 21, and the pusher 32 and the cone sleeve 21 are connected by the anti-reverse locking unit 4.

[0046] Specifically, the anti-reverse locking unit 4 includes a load-transfer sleeve 41, a snap ring sleeve 42, and a connecting sleeve 43. The load-transfer sleeve 41 is coaxially disposed on the outside of the body 1, and its upper end is fixedly connected to the lower end of the pusher 32. The snap ring sleeve 42 is coaxially disposed on the outside of the body 1, and its upper end is fixedly connected to the lower end of the load-transfer sleeve 41. The connecting sleeve 43 is coaxially disposed on the outside of the body 1, and its upper end is fixedly connected to the lower end of the snap ring sleeve 42. The lower end of the connecting sleeve 43 axially abuts against the cone sleeve 21. A first snap ring 44 is provided on the inner wall of the snap ring sleeve 42, and a one-way ratchet adapted to the first snap ring 44 is provided on the outer wall of the body 1, so that the snap ring sleeve 42 can only move downward relative to the body 1 and cannot move upward. This prevents retraction before mounting and prevents the mounting assembly 2 from retracting and resetting after mounting.

[0047] In one embodiment, a third screw 47 is radially disposed on the snap ring sleeve 42. A guide groove adapted to the third screw 47 is axially disposed on the outer wall of the body 1. The third screw 47 is adapted to the guide groove, so that the snap ring sleeve 42 can only move axially relative to the body 1, thereby preventing rotation.

[0048] In one embodiment, the lower end of the load transfer sleeve 41 and the upper end of the snap ring sleeve 42 overlap each other radially. In this embodiment, the upper end of the snap ring sleeve 42 is coaxially sleeved on the outside of the lower end of the load transfer sleeve 41. The radially overlapping portions of the load transfer sleeve 41 and the snap ring sleeve 42 are connected by a first screw 45, thereby fixing the load transfer sleeve 41 and the snap ring sleeve 42 together. The lower end of the snap ring sleeve 42 and the upper end of the connecting sleeve 43 overlap each other radially. In this embodiment, the upper end of the connecting sleeve 43 is coaxially sleeved on the outside of the lower end of the snap ring sleeve 42. The radially overlapping portions of the snap ring sleeve 42 and the connecting sleeve 43 are connected by a second screw 46, thereby fixing the snap ring sleeve 42 and the connecting sleeve 43 together.

[0049] In one embodiment, a second retaining ring 48 is provided on the inner wall of the connecting sleeve 43, and a one-way ratchet adapted to the second retaining ring 48 is provided on the outer wall of the body 1, so that the connecting sleeve 43 can only move downward relative to the body 1 and cannot move upward, preventing the seat assembly 2 from resetting after being seated.

[0050] In one embodiment, a third retaining ring 11 is fixedly provided on the outer wall of the body 1, and the third retaining ring 11 is located above the drive housing 31 of the drive assembly 3. The outer diameter of the third retaining ring 11 is larger than the inner diameter of the drive housing 31, so that the upper end of the drive housing 31 axially abuts against the lower end of the third retaining ring 11, making it impossible for the drive housing 31 to move upward relative to the body 1.

[0051] In one embodiment, a sealing groove is provided on the outer wall of the main body 1, and the upper end face of the third retaining spring 11 coincides with the lower end face of the sealing groove. A sealing assembly 12 is provided in the sealing groove, and the lower end face of the sealing assembly 12 axially abuts against the upper end face of the third retaining spring 11. The sealing assembly 12 is reserved for the next step of reconnecting the cementing operation, and seals with the reconnection plug to ensure the sealing of the tubing string.

[0052] In one embodiment, a straightening component 5 is provided on the outer wall of the main body 1. The straightening component 5 is axially spaced below the seat hanging component 2 and plays a straightening role for the hanger 100.

[0053] The straightening assembly 5 includes a straightening member 51, a threaded retaining ring 52, and a fourth screw 53. The threaded retaining ring 52 is coaxially sleeved on the outside of the body 1, and is fixedly connected to the body 1 by the fourth screw 53. Threads are provided on the outer wall of the threaded retaining ring 52, and the straightening member 51 is coaxially fixed to the outside of the threaded retaining ring 52 via a threaded connection. If the straightening member 51 were directly threaded to the body 1, it would cause significant damage to the strength of the body 1; the threaded retaining ring 52 reduces the degree of damage to the strength of the body 1.

[0054] According to the suspension 100 proposed in this invention, the thrust of the pusher 32 of the drive assembly 3 can be adjusted according to on-site requirements, such as adjusting the amount of reactant 33, thereby adjusting the magnitude of the seat-hanging thrust. Simultaneously, the stroke of the pusher 32 can also be adjusted according to the seat-hanging stroke of the suspension 100.

[0055] In one embodiment of the present invention, the hanger 100 is a tailpipe hanger, and the working principle of the hanger 100 is as follows.

[0056] The suspension unit 100 is lowered to a preset position in the well using a delivery tool. A mounting signal is then sent from the wellhead. Upon receiving the mounting signal, the signal receiving unit activates reactant 33, causing a chemical reaction that generates high-pressure gas. The high-pressure gas causes the pusher 32 to move downwards relative to the drive housing 31. The pusher 32 pushes the cone sleeve 21 of the mounting assembly 2 downwards relative to the body 1, thereby causing the slip 22 to expand radially, completing the mounting process.

[0057] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0058] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A suspension device, comprising: Ontology(1); The seat-hanging assembly (2) is located on the outside of the main body (1); as well as The drive assembly (3) is located on the outside of the main body (1). The drive assembly (3) is configured to generate high-pressure gas in response to the seat signal and to enable the seat assembly (2) to complete the seating under the action of the high-pressure gas.

2. The suspension device according to claim 1, characterized in that, The driving component (3) includes: The drive housing (31) is located on the outside of the main body (1); A pusher (32) movably disposed axially within the drive housing (31) for adaptation to the seat assembly (2). A signal receiving unit for receiving seat signals is provided on the drive housing (31); The reactant (33) disposed in the drive housing (31) is configured to generate high-pressure gas in response to the signal receiving unit. The high-pressure gas pushes the pusher (32) to move axially relative to the drive housing (31), thereby enabling the seat assembly (2) to complete the seat.

3. The suspension device according to claim 2, characterized in that, The drive housing (31) includes: Outer shell (311); An inner housing (312) is coaxially spaced within the outer housing (311), and a drive cavity (314) is formed between the outer housing (311) and the inner housing (312). An end housing (313) is provided at the ends of the outer shell (311) and the inner shell (312) to seal the drive cavity (314), the end housing (313) being located at the end of the drive cavity (314) away from the seat assembly (2); The pusher (32) is axially movably sealed within the drive cavity (314), and the reactant (33) is located between the pusher (32) and the end housing (313).

4. The suspension device according to claim 2 or 3, characterized in that, The seat-hanging assembly (2) includes a cone sleeve (21), a clasp (22) and a support sleeve (23) arranged coaxially from top to bottom on the outside of the body (1). The drive assembly (3) is located above the cone sleeve (21), and the lower end of the pusher (32) of the drive assembly (3) is connected to the cone sleeve (21).

5. The suspension device according to claim 4, characterized in that, The conical sleeve (21) is connected to the body (1) via a third shear pin (27), and the support sleeve (23) is connected to the body (1) via a first shear pin (24). A shear pin sleeve (26) is coaxially provided on the outside of the body (1) via a second shear pin (25). The shear pin sleeves (26) are spaced apart below the support sleeve (23).

6. The suspension device according to claim 4, characterized in that, The pusher (32) and the cone sleeve (21) are connected by an anti-reverse locking unit (4), which is configured to prevent the cone sleeve (21) and the pusher (32) from moving upward relative to the body (1).

7. The suspension device according to claim 6, characterized in that, The anti-reverse locking unit (4) includes: A load transfer sleeve (41) is fixedly installed at the lower end of the pusher (32); A retaining ring sleeve (42) is fixedly installed at the lower end of the transmission sleeve (41). A first retaining ring (44) is provided on the inner wall of the retaining ring sleeve (42). A one-way ratchet adapted to the first retaining ring (44) is provided on the outer wall of the body (1). A connecting sleeve (43) is fixedly installed at the lower end of the snap ring sleeve (42), and the connecting sleeve (43) abuts axially with the tapered sleeve (21).

8. The suspension device according to claim 7, characterized in that, The lower end of the load transfer sleeve (41) and the upper end of the snap ring sleeve (42) overlap each other radially. The radially overlapping portion of the load transfer sleeve (41) and the snap ring sleeve (42) is connected by a first screw (45). The lower end of the snap ring sleeve (42) and the upper end of the connecting sleeve (43) overlap each other radially. The radially overlapping portion of the snap ring sleeve (42) and the connecting sleeve (43) is connected by a second screw (46).

9. The suspension device according to any one of claims 1 to 8, characterized in that, A third retaining ring (11) is fixedly provided on the outer wall of the main body (1), and the third retaining ring (11) abuts axially with the upper end of the drive assembly (3).

10. The suspension device according to any one of claims 1 to 8, characterized in that, A straightening component (5) is provided on the outer wall of the main body (1), and the straightening component (5) is axially spaced below the seat hanging component (2).

Images