Switch sliding sleeve

Abstract

The switch sliding sleeve comprises an outer sleeve, a sliding sleeve and a sealing portion, the sliding sleeve is connected in the outer sleeve in a sliding mode, the sliding sleeve comprises an upper connector, a middle sleeve and a lower connector which are sequentially connected in the axial direction and communicated with one another, the middle sleeve is provided with an overflowing hole, and the sliding sleeve is provided with an overflowing groove in the circumferential direction. The sliding sleeve slides relative to the outer sleeve, the overflowing hole can correspond to the overflowing groove, the sealing part comprises a first sealing assembly, a second sealing assembly and a third sealing assembly, and the first sealing assembly, the second sealing assembly and the third sealing assembly are sequentially arranged on the outer wall of the sliding sleeve at intervals in a surrounding mode in the axial direction. The pressure resistance and the high temperature resistance of the sealing part are effectively enhanced, so that the switch sliding sleeve is kept in a sealed state in a high-temperature and high-pressure environment in a well, the safety and the reliability of underground construction are ensured, and the production efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas mining equipment, in particular to a switch sliding sleeve. Background Art

[0002] In the construction projects of acidizing, fracturing, and drainage of oil wells, it is necessary to timely establish an oil-casing channel on the upper part of the packer according to the needs of the operation, which is used to reverse the wellbore fluid after the construction string is put into the well, lift the hydraulic pump, and backwash the well after fracturing and acidizing construction. Therefore, the reliability of the downhole switch sleeve in the downhole operation is particularly important. Its working principle is: increase the casing pressure, open the valve core set inside the switch sleeve by establishing the oil-casing pressure difference, and achieve the purpose of oil-casing connection. The existing switch sleeve valve core is displaced under the action of pressure, and at the moment of passing through the oil-casing connection hole, the injection casing pressure is suddenly released into the oil pipe.

[0003] However, with the development of oil and gas development, downhole environmental conditions are becoming more and more complex, and downhole temperatures and pressures are getting higher and higher. Traditional switch sleeves can no longer meet the requirements. In this high temperature and high pressure environment, the sealing rings of traditional switch sleeves cannot withstand such high pressures and temperatures, and may lose their original physical properties and become prone to deformation or rupture, causing traditional switch sleeves to easily experience problems such as sealing failure, affecting the normal production of oil and gas wells. Utility Model Content

[0004] In view of the deficiencies in the prior art, a switch sliding sleeve is provided.

[0005] To achieve the above-mentioned purpose, the utility model provides a switch sleeve, including an outer sleeve, a sliding sleeve and a sealing part. The sliding sleeve is slidably connected in the outer sleeve. The sliding sleeve includes an upper joint, an intermediate sleeve and a lower joint which are connected in sequence along the axial direction and communicate with each other. The intermediate sleeve is provided with a flow hole, and the sliding sleeve is provided with a flow groove along the circumferential direction. The sliding sleeve and the outer sleeve slide relative to each other, so that the flow hole and the flow groove can correspond to each other. The sealing part includes a first sealing component, a second sealing component and a third sealing component. The first sealing component, the second sealing component and the third sealing component are arranged in annular rings on the outer wall of the sliding sleeve in sequence along the axial direction.

[0006] According to an embodiment of the present invention, an elastic portion is formed at one end of the sliding sleeve close to the lower joint, a clamping portion is provided on the inner wall of the lower joint, and the elastic portion is slidably connected to the clamping portion.

[0007] According to one embodiment of the utility model, the clamping portion includes a first clamping groove, a second clamping groove and a third clamping groove spaced apart along the axial direction, the sliding sleeve slides relative to the middle sleeve, and the elastic portion can be connected to the first clamping groove, the second clamping groove and the third clamping groove respectively.

[0008] According to one embodiment of the utility model, the elastic part includes a plurality of movable parts arranged at intervals along the circumferential direction, each movable part is provided with a limiting protrusion, the sliding sleeve slides relative to the middle sleeve, and the limiting protrusion can be respectively engaged with the first engaging groove, the second engaging groove and the third engaging groove.

[0009] According to one embodiment of the utility model, the first sealing assembly includes a sand retaining ring, a first sealing ring, a second sealing ring, a third sealing ring and a bidirectional metal sealing ring which are sequentially arranged along the axial direction.

[0010] According to one embodiment of the utility model, a first groove is formed on one side of the first sealing ring, and a first convex portion is formed on the other side thereof; a second groove is formed on one side of the second sealing ring, and a second convex portion is formed on the other side thereof; a third groove is formed on one side of the third sealing ring, and a third convex portion is formed on the other side thereof; the first convex portion is engaged with the second groove, and the second convex portion is engaged with the third groove.

[0011] According to an embodiment of the present utility model, the second sealing assembly includes two sand retaining rings and a sealing ring, and the sealing ring is arranged between the two sand retaining rings.

[0012] According to an embodiment of the utility model, a connection groove is provided at the connection between the middle sleeve and the lower joint, and a connection end is correspondingly provided at the lower joint, and the connection end is snap-connected with the connection groove.

[0013] According to one embodiment of the utility model, the sliding sleeve is provided with a balancing hole along the circumferential direction, and the balancing hole is located between the flow groove and the sealing portion.

[0014] According to one embodiment of the utility model, a first limiting portion is provided on the inner wall of the upper joint, a second limiting portion is provided on the inner wall of the lower joint, and the sliding sleeve is slidably connected between the first limiting portion and the second limiting portion.

[0015] The beneficial effect of the utility model is that the sliding sleeve is movably connected to the outer sleeve, so that the flow hole and the flow groove can correspond to each other, thereby changing the use state of the switch sleeve. The sealing part seals the annular space between the sliding sleeve and the intermediate sleeve. The sealing part is composed of a first sealing component, a second sealing component and a third sealing component, which strengthens the pressure resistance and high temperature resistance of the sealing part, so that the switch sleeve can maintain a sealed state under the high temperature and high pressure environment in the well, ensuring the safety and reliability of underground construction and effectively improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 is a cross-sectional view of a switch sleeve in an embodiment;

[0018] Figure 2 is an exploded view of the switch sleeve in the embodiment;

[0019] Figure 3 It is an enlarged view of part A in the embodiment;

[0020] Figure 4 It is a three-dimensional view of the sliding sleeve in the embodiment.

[0021] Description of Reference Numerals

[0022] 1-outer sleeve; 2-sliding sleeve; 3-sealing part; 11-upper joint; 12-middle sleeve; 13-lower joint; 21-flow groove; 22-elastic part; 23-balance hole; 31-first sealing assembly; 32-second sealing assembly; 33-third sealing assembly; 34-high pressure sealing ring; 111-first limiting part; 121-flow hole; 122-connecting groove; 131-clamping part; 132-connecting end; 133-second limiting part; 211-movable part ;311-sand retaining ring;312-first sealing ring;313-second sealing ring;314-third sealing ring;315-bidirectional metal sealing ring;321-sealing ring;1311-first snap-in groove;1312-second snap-in groove;1313-third snap-in groove;2111-limiting protrusion;3121-first groove;3122-first protrusion;3131-second groove;3132-second protrusion;3141-third groove;3142-third protrusion. DETAILED DESCRIPTION

[0023] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0024] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0025] Please refer to Figure 1 and Figure 2 , Figure 1 is a three-dimensional diagram of the switch sleeve in this embodiment, Figure 2 1 is an exploded view of the switch sleeve in this embodiment. This embodiment provides an oil pipe switch sleeve, comprising an outer sleeve 1, a sliding sleeve 2 and a sealing portion 3. The sliding sleeve 2 is slidably connected in the outer sleeve 1.

[0026] Specifically, the outer sleeve 1 includes an upper joint 11, an intermediate sleeve 12 and a lower joint 13 which are sequentially connected along the axial direction, and the upper joint 11, the intermediate sleeve 12 and the lower joint 13 are connected to each other. The upper joint 11 and the lower joint 13 are respectively used to connect with the casing, the intermediate sleeve 12 is provided with a flow hole 121, and the peripheral wall of the sliding sleeve 2 is provided with a flow groove 21. The sliding sleeve 2 and the outer sleeve 1 slide relative to each other, so that the flow groove 21 can correspond to the flow hole 121. The sliding sleeve 2 slides in the outer sleeve 1, and when the flow groove 21 corresponds to the flow hole 121, the switch sliding sleeve is connected inside and outside, and the switch sliding sleeve is in an open state. In order to ensure that the outer sleeve 1 and the sliding sleeve 2 are kept in a sealed state, the sealing part 3 is annularly arranged on the outer wall of the sliding sleeve 2, and the sealing part 3 is located between the sliding sleeve 2 and the intermediate sleeve 12. The sealing part 3 seals the annular space between the sliding sleeve 2 and the intermediate sleeve 12 to ensure the sealing of the switch sliding sleeve. Furthermore, the sealing portion 3 includes a first sealing component 31 , a second sealing component 32 and a third sealing component 33 , and the first sealing component 31 , the second sealing component 32 and the third sealing component 33 are arranged on the outer wall of the sliding sleeve 2 along the axial direction of the sliding sleeve 2 at intervals.

[0027] In a high-temperature and high-pressure underground operation environment, the first sealing component 31 is used to withstand the downward pressure from the wellhead, the third sealing component 33 is used to withstand the upward pressure from the bottom of the well, and the second sealing component 32 is arranged between the first sealing component 31 and the third sealing component 33 to play an auxiliary sealing role. When one of the sealing components fails unexpectedly, the switch sleeve is still in a sealed state under the sealing of the remaining two sealing components, thereby effectively improving the pressure resistance and stability of the switch sleeve, so that the switch sleeve can be widely used in different usage scenarios.

[0028] Preferably, the middle sleeve has 12-16 flow holes 121 and the sliding sleeve 2 has 10-12 flow grooves 21 to improve the flow efficiency. The sliding sleeve 2 slides relative to the outer sleeve 1, and the multiple flow grooves 21 correspond to the multiple flow holes 121, so that the sliding sleeve 2 is connected with the outer sleeve 1, and the switch sleeve is in an open state.

[0029] Please refer to Figure 3 , Figure 3 It is an enlarged view of part A. Further, the first sealing assembly 31 includes a sand retaining ring 311, a first sealing ring 312, a second sealing ring 313, a third sealing ring 314 and a bidirectional metal sealing ring 315, which are arranged in an array.

[0030] In this embodiment, the first sealing assembly 31 is provided with two sand retaining rings 311, two first sealing rings 312, two second sealing rings 313, two third sealing rings 314 and a bidirectional metal sealing ring 315. With the bidirectional metal sealing ring 315 as the symmetry center, the sand retaining ring 311, the first sealing ring 312, the second sealing ring 313 and the third sealing ring 314 are arranged in sequence at one end of the bidirectional metal sealing ring 315, and the third sealing ring 314, the second sealing ring 313, the first sealing ring 312 and the sand retaining ring 311 are arranged in sequence at the other end of the bidirectional metal sealing ring 315. The sand retaining ring 311 is used to prevent foreign matter such as sand and gravel from entering between the sliding sleeve 2 and the intermediate sleeve 12, so as to prevent the wear of the switch sliding sleeve caused by the jamming of sand and gravel.

[0031] Preferably, the first sealing ring 312 is made of improved PEEK material, and a certain proportion of glass fiber is filled in the PEEK (polyetheretherketone) material to form an improved PEEK material. By using the improved PEEK material, the strength of the first sealing ring 312 is increased, and it is not easy to be damaged when it is subjected to the thrust from the third sealing ring 314 and the second sealing ring 313. The second sealing ring 313 is made of improved PTFE material, and a certain proportion of molybdenum disulfide is filled in the PTFE (polytetrafluoroethylene) material, so that it has high wear resistance and scratch resistance. When in a sealed state, it is not easy to be damaged; the third sealing ring 314 is made of improved fluororubber material, which has the characteristics of high temperature resistance and corrosion resistance. Therefore, by using different materials to form different sealing rings, the first sealing component 31 has multiple properties.

[0032] It should be noted that the third sealing component 33 and the first sealing component 31 are made of the same material and have the same effects.

[0033] The second sealing assembly 32 includes two sand retaining rings 311 and a sealing ring 321, and the sealing ring 321 is arranged between the two sand retaining rings 311. In this embodiment, the sealing ring 321 is made of improved PTFE (polytetrafluoroethylene) material, so that the sealing ring 321 has improved strength and good high wear resistance, scratch resistance and high temperature resistance.

[0034] Please continue to refer to Figure 3 In order to further strengthen the sealing between the first sealing ring 312, the second sealing ring 313 and the third sealing ring 314, a first groove 3121 is formed on one side of the first sealing ring 312, and a first convex portion is formed on the other side thereof; a second groove 3131 is formed on one side of the second sealing ring 313, and a second convex portion 3132 is formed on the other side thereof; a third groove 3141 is formed on one side of the third sealing ring 314, and a third convex portion 3142 is formed on the other side thereof.

[0035] The first sealing ring 312, the second sealing ring 313 and the third sealing ring are arranged in sequence, so that the first groove 3121 is engaged with the second convex part 3132, and the second groove 3131 is engaged with the third convex part 3142, thereby strengthening the close fit of the first sealing ring 312, the second sealing ring 313 and the third sealing ring 314. During underground operation, the switch sleeve is under pressure, and the greater the pressure, the tighter the connection between the three and the better the sealing performance.

[0036] Preferably, the sealing part 3 further includes a high-pressure sealing ring 34, which is arranged on the outer wall of the sliding sleeve 2 and is located between the first sealing assembly 31 and the second sealing assembly 32. The high-pressure sealing ring 34 is used to strengthen the supporting force of the sealing assembly 3, improve the pressure resistance of the sealing assembly 3, keep the switch sleeve stable under high pressure and high temperature environment, and ensure normal downhole operation.

[0037] Please refer to Figure 4 , Figure 4 2 is a three-dimensional diagram of the sliding sleeve. The sliding sleeve 2 is also provided with a plurality of balancing holes 23, which are arranged on the peripheral wall of the sliding sleeve 2 along the circumferential direction. When the balancing holes 23 are aligned with the flow holes 121, the switch sliding sleeve is in a balanced state. In this embodiment, a total of four groups of balancing holes 23 are provided. The four groups of balancing holes 23 are arranged on the peripheral wall of the sliding sleeve 2 at equal intervals along the circumferential direction.

[0038] An elastic part 22 is formed at one end of the sliding sleeve 2, and a clamping part 131 is provided on the inner wall of the lower joint 13. When the sliding sleeve 2 slides relative to the outer sleeve 1, the elastic part 22 is slidably connected to the clamping part 131. The elastic part 22 and the clamping part 131 are movably matched to adjust the use state of the switch sliding sleeve.

[0039] Please refer to Figure 1 Specifically, the clamping portion 131 includes a first clamping groove 1311, a second clamping groove 1312 and a third clamping groove 1313. The first clamping groove 1311, the second clamping groove 1312 and the third clamping groove 1313 are axially arranged on the inner wall of the lower joint 13. The first clamping groove 1311, the second clamping groove 1312 and the third clamping groove 1313 are respectively used to limit different positions of the sliding sleeve 2 relative to the intermediate sleeve 12. The sliding sleeve 2 slides relative to the intermediate sleeve 12, and the elastic portion 22 slides relative to the clamping portion 131. When the elastic portion 22 cooperates with one of the clamping grooves, the sliding sleeve 2 remains relatively fixed relative to the intermediate sleeve 12, and the switch sliding sleeve is adjusted to a certain use state.

[0040] In this embodiment, when the elastic part 22 is engaged with the first engaging groove 1311, the flow groove 21 is blocked by the sliding sleeve 2, the switch sleeve is not circulated inside and outside, and the switch sleeve is in a closed state; when the elastic part 22 is engaged with the second engaging groove 1312, the balance hole 23 of the sliding sleeve 2 is aligned with the flow groove 21, and the switch sleeve is in a pressure balance state; when the elastic part 22 is engaged with the third engaging groove 1313, the flow hole 121 of the sliding sleeve 2 is aligned with the flow groove 21, and the switch sleeve is in an open state. Thus, the elastic part 22 changes the use state of the switch sleeve by engaging with engaging grooves at different positions.

[0041] Please refer to Figure 4Preferably, the elastic part 22 includes a plurality of movable parts 211, which are arranged on the peripheral wall of the sliding sleeve 2 at intervals along the circumferential direction, so that the elastic part 22 can be bent and has elasticity. A limiting convex part 2111 is provided on each movable part 211, and when the sliding sleeve 2 slides relative to the intermediate sleeve 12, the limiting convex part 2111 can be respectively engaged with the first engaging groove 1311, the second engaging groove 1312 and the third engaging groove 1313, so as to realize the mutual clamping of the movable part 211 and the engaging part 131, thereby maintaining the relative stability of the sliding sleeve 2.

[0042] Preferably, a connection groove 122 is provided at the connection between the middle sleeve 12 and the lower joint 13, and a connection end 132 is correspondingly provided at the lower joint 13, and the connection groove 122 matches the connection end 132. When the middle sleeve 12 is connected to the lower joint 13, the connection end 132 is clamped in the connection groove 122, so that the middle sleeve 12 and the lower joint 13 are tightly connected.

[0043] In addition, in order to limit the moving range of the sliding sleeve 2, a first limiting portion 111 is provided on the inner wall of the upper joint 11, and a second limiting portion 133 is provided on the inner wall of the lower joint 13. The sliding sleeve 2 is slidably connected between the first limiting portion 111 and the second limiting portion 133. The first limiting portion 111 is used to abut against the upper end of the sliding sleeve 2 to prevent the sliding sleeve 2 from sliding out of the upper joint 11; the second limiting portion 133 is used to abut against the lower end of the sliding sleeve 2 to prevent the sliding sleeve 2 from sliding out of the lower joint 13. Therefore, by providing the first limiting portion 111 and the second limiting portion 133, the sliding range of the sliding sleeve 2 is limited to prevent the sliding sleeve 2 from sliding out of the outer sleeve 1.

[0044] The specific working principle of the switch sleeve of the utility model is as follows: when the switch sleeve is in the closed state, a wire tool string is used to lower the sleeve switch tool into the sliding sleeve 2 of the switch sleeve, and by shocking the sliding sleeve 2 downward, the elastic part 22 contracts and moves downward relative to the lower joint 13. When the elastic part 22 moves to the second clamping groove 1312 and is clamped therewith, the sleeve switch is in a balanced state; the sliding sleeve 2 is continuously shocked downward, and when the elastic part 22 moves to the third clamping groove 1313, the flow hole 121 corresponds to the flow groove 21, and the switch sleeve is in an open state. Thus, by shocking the sliding sleeve 2, the elastic part 22 first moves to the second clamping groove 1312 in the direction close to the third clamping groove 1313, and the sliding sleeve 2 is continuously shocked to move the elastic part 22 to the third clamping groove 1313, so that the switch sleeve is opened. When the switch sleeve needs to be closed, the sliding sleeve 2 is shocked to move the sliding sleeve 2 upward relative to the outer sleeve 1, so that the elastic portion 22 moves to the first engaging groove 1311, and the switch sleeve is closed.

[0045] In summary, the sliding sleeve 2 is movably connected to the outer sleeve 1, and the elastic portion 22 of the sliding sleeve 2 cooperates with the clamping portion 131 to open or close the flow hole 121, thereby changing the use state of the switch sleeve. The sealing portion 3 seals the annular space between the sliding sleeve 2 and the intermediate sleeve 12. The sealing portion 3 is composed of a first sealing component 31, a second sealing component 32 and a third sealing component. The pressure resistance and high temperature resistance of the sealing portion 3 are enhanced, so that the switch sleeve maintains a sealed state under the high temperature and high pressure environment in the well, ensuring the safety and reliability of the underground construction and effectively improving the production efficiency.

[0046] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A switch sleeve, characterized in that: include: An outer sleeve (1), a sliding sleeve (2) and a sealing portion (3), wherein the sliding sleeve (2) is slidably connected in the outer sleeve (1), and the sliding sleeve (2) comprises an upper joint (11), an intermediate sleeve (12) and a lower joint (13) which are sequentially connected and interconnected along the axial direction, the intermediate sleeve (12) is provided with a flow hole (121), and the sliding sleeve (2) is circumferentially provided with a flow groove (21), the sliding sleeve (2) and the outer sleeve (1) slide relative to each other so that the flow hole (121) corresponds to the flow groove (21), and the sealing portion (3) comprises a first sealing component (31), a second sealing component (32) and a third sealing component (33), and the first sealing component (31), the second sealing component (32) and the third sealing component (33) are sequentially spaced and arranged on the outer wall of the sliding sleeve (2) along the axial direction.

2. The switch sleeve according to claim 1, characterized in that: An elastic portion (22) is formed at one end of the sliding sleeve (2) close to the lower joint (13), and a clamping portion (131) is provided on the inner wall of the lower joint (13), and the elastic portion (22) is slidably connected to the clamping portion (131).

3. The switch sleeve according to claim 2, characterized in that: The clamping portion (131) includes a first clamping groove (1311), a second clamping groove (1312) and a third clamping groove (1313) which are arranged at intervals along the axial direction. The sliding sleeve (2) slides relative to the intermediate sleeve (12), and the elastic portion (22) can be connected to the first clamping groove (1311), the second clamping groove (1312) and the third clamping groove (1313) respectively.

4. The switch sleeve according to claim 3, characterized in that: The elastic part (22) includes a plurality of movable parts (211) arranged at intervals along the circumferential direction, each movable part (211) is provided with a limiting protrusion (2111), the sliding sleeve (2) slides relative to the intermediate sleeve (12), and the limiting protrusion (2111) can be respectively engaged with the first engaging groove (1311), the second engaging groove (1312) and the third engaging groove (1313).

5. The switch sleeve according to claim 1, characterized in that: The first sealing assembly (31) comprises a sand retaining ring (311), a first sealing ring (312), a second sealing ring (313), a third sealing ring (314) and a bidirectional metal sealing ring (315) which are arranged in sequence along the axial direction.

6. The switch sleeve according to claim 5, characterized in that: A first groove (3121) is formed on one side of the first sealing ring (312), and a first convex portion (3122) is formed on the other side thereof; a second groove (3131) is formed on one side of the second sealing ring (313), and a second convex portion (3132) is formed on the other side thereof; a third groove (3141) is formed on one side of the third sealing ring (314), and a third convex portion (3142) is formed on the other side thereof; the first convex portion (3122) is engaged with the second groove (3131), and the second convex portion (3132) is engaged with the third groove (3141).

7. The switch sleeve according to claim 5, characterized in that: The second sealing assembly (32) comprises two sand retaining rings (311) and a sealing ring (321), wherein the sealing ring (321) is arranged between the two sand retaining rings (311).

8. The switch sleeve according to claim 1, characterized in that: A connection groove (122) is provided at the connection point between the intermediate sleeve (12) and the lower joint (13), and a connection end (132) is correspondingly provided at the lower joint (13), and the connection end (132) is snap-connected with the connection groove (122).

9. The switch sleeve according to claim 1, characterized in that: The sliding sleeve (2) is provided with a balancing hole (23) along the circumferential direction, and the balancing hole (23) is located between the flow groove (21) and the sealing portion (3).

10. The switch sleeve according to claim 1, characterized in that: The inner wall of the upper joint (11) is provided with a first limiting portion (111), the inner wall of the lower joint (13) is provided with a second limiting portion (133), and the sliding sleeve (2) is slidably connected between the first limiting portion (111) and the second limiting portion (133).

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