Wear resistant rotary compensator

Abstract

The application relates to the technical field of pipeline compensation, and discloses a wear-resistant rotary compensator which is used to solve the problem of uneven wear caused by different extrusion forces on sealing fillers. The rotary compensator is characterized by the following technical scheme: a ring bag is arranged on an inner pipe; a threaded pipe which is connected with the inner pipe and the ring bag is arranged on the inner pipe in an array; an inclined groove is arranged on a limiting flange; a supporting block is arranged between the limiting flange and a pressing sleeve, and the supporting block is located in the inclined groove; when the rotary compensator is installed to convey medium, the pressure in the inner pipe is increased, the pressure makes the ring bag expand, the supporting block is pushed to slide along the inclined groove, the extrusion force of the supporting block on the inner ring of the pressing sleeve is increased, the extrusion force of the inner ring of the pressing sleeve on the sealing filler is increased, the sealing filler after wear is extruded and compensated, the sealing effect is maintained, the extrusion force of the inner ring of the pressing sleeve on the sealing filler is compensated, and the phenomenon that the uneven wear is caused by the uneven extrusion force of the pressing sleeve on the sealing filler is prevented.

Description

Technical Field

[0001] This application relates to the field of pipeline compensation technology, and in particular to a wear-resistant rotary compensator. Background Technology

[0002] In heating pipelines, in order to prevent the pipeline from deforming or being damaged due to thermal expansion or temperature stress, rotary compensators are needed to compensate for the thermal expansion of the pipeline, thereby reducing the stress on the pipe wall and the force acting on the valve or support structure.

[0003] Existing rotary compensators with compensating springs typically consist of an outer tube, an inner tube, a pressure sleeve, a limiting flange, and several compensating springs. A sealing packing is placed between the outer tube and the inner tube to seal the gap between the two structures. When fixing the outer tube, pressure sleeve, and limiting flange of the rotary compensator, the three parts are usually directly fixed together using connecting bolts and nuts. The pressure sleeve is used to compress the sealing packing. The pressure sleeve is fixed at the outer ring, and the pressure sleeve compresses the sealing packing at the inner ring. Because the compensating springs compress the pressure sleeve, the compressive force on the sealing packing is uneven. That is, the sealing packing at the innermost ring of the pressure sleeve experiences the least pressure, while the sealing packing near the outer ring experiences the greatest pressure. When the inner tube rotates, this results in different frictional forces on the sealing packing, leading to uneven wear of the sealing packing. Summary of the Invention

[0004] This application proposes a wear-resistant rotary compensator, which has the advantage of automatically compensating for the clamping force of the inner ring sealing packing of the pressure sleeve, in order to solve the problem of uneven wear caused by different extrusion forces on the sealing packing.

[0005] To achieve the above objectives, this application adopts the following technical solution: A wear-resistant rotary compensator includes an outer sleeve, balls, an inner tube, sealing packing, a pressure sleeve, a limiting flange, and a compensating spring. Between the pressure sleeve and the limiting flange, there are: several threaded tubes arranged in a ring array on the inner tube between the pressure sleeve and the limiting flange, with one end connected to the interior of the inner tube; an annular bladder fixedly sleeved on the inner tube between the pressure sleeve and the limiting flange, and connected to the other end of the threaded tubes; several inclined grooves are arranged in a ring array on the side of the limiting flange facing the pressure sleeve; several support blocks are arranged in a ring array between the limiting flange and the pressure sleeve, with the side of the support block facing the limiting flange being inclined, the inclined surface of the support block slidingly installed in the inclined groove, the other end of the support block tightly abutting the pressure sleeve, and the side of the support block near the inner tube tightly abutting the outer wall of the annular bladder.

[0006] Furthermore, the inclined groove is a groove that is deeper on the side closer to the axis of the limiting flange and shallower on the side farther from the axis; the inclined surface of the support block is a surface that is higher on the side closer to the axis of the limiting flange and lower on the side farther from the axis.

[0007] Furthermore, the annular sac is an inflatable sac.

[0008] Furthermore, a protective bladder is movably sleeved on the outer side of the compensating spring. The protective bladder is filled with high-pressure gas, and its volume is constant, so it will not expand or deform.

[0009] Furthermore, a telescopic bladder is fixedly connected to the side of the protective bladder facing the support block. The telescopic bladder is in communication with the protective bladder. The telescopic bladder cannot expand or deform. The telescopic bladder can expand and contract axially. The side of the telescopic bladder facing the support block is in close contact with the support block.

[0010] Furthermore, the support block is provided with: several mounting grooves, respectively opened at both ends of the support block facing the pressure sleeve and the limiting flange; a support spring, one end of which is fixedly connected to the bottom end of the mounting groove; a limiting bead, fixedly connected to the other end of the support spring; several sets of semi-circular grooves are equidistantly opened in the inclined groove of the limiting flange, and the several sets of semi-circular grooves are arranged in the radial direction of the limiting flange; several sets of semi-circular grooves are opened on one side of the pressure sleeve that is close to the support block, and the several sets of semi-circular grooves are arranged in the radial direction of the pressure sleeve.

[0011] Furthermore, a through hole is provided at the middle position of the bottom end of the inclined groove. The through hole passes through the limiting flange, and a guide rod is movably provided in the through hole. One end of the guide rod is fixedly connected to the middle position of the support block, and the other end of the guide rod passes through and extends out of the through hole.

[0012] Furthermore, the support spring is always in a compressed state.

[0013] Furthermore, the radial distance between several sets of semicircular grooves on the pressure sleeve is equal to the radial distance between several sets of semicircular grooves in the inclined groove of the limiting flange.

[0014] This application has the following beneficial effects: 1. This application provides a wear-resistant rotary compensator, which comprises an annular bladder fitted on an inner tube, several threaded pipes arranged in an array on the inner tube connecting the inside of the inner tube and the annular bladder, a slanted groove on a limiting flange, and a support block between the limiting flange and the pressure sleeve, with the support block located within the slanted groove. When the rotary compensator is installed and the medium is being transported, the pressure inside the inner tube increases, and the pressure is transmitted to the annular bladder through the threaded pipes, causing the annular bladder to expand. This pushes the support block to slide along the slanted groove, increasing the compressive force of the support block on the inner ring of the pressure sleeve, thereby increasing the compressive force of the inner ring of the pressure sleeve on the sealing packing. This compensates for the wear of the sealing packing, maintaining the sealing effect, and also compensates for the compressive force of the inner ring of the pressure sleeve on the sealing packing, preventing uneven wear caused by uneven compressive force of the pressure sleeve on the sealing packing.

[0015] 2. The wear-resistant rotary compensator provided in this application protects the compensating springs by providing a protective sleeve on the outside of the compensating springs. This prevents the multiple compensating springs from rusting or unevenly oxidizing after long-term exposure to wind and sun, and avoids the phenomenon of uneven extrusion pressure on the pressure sleeve and sealing packing due to different elastic coefficients of multiple compensating springs, which would lead to abnormal wear of the sealing packing.

[0016] 3. The wear-resistant rotary compensator provided in this application has a telescopic bladder connected to the protective bladder at the position facing the support block, with one side of the telescopic bladder closely attached to the support block. When transmitting the medium, the annular bladder expands and pushes the support block to move along the inclined groove, causing the support block to squeeze the pressure sleeve, increasing the pressure of the pressure sleeve on the sealing packing, and ensuring the sealing effect of the sealing packing. When the medium is not being transmitted, the annular bladder does not expand, and the pressure of the gas inside the protective bladder and the telescopic bladder pushes the support block to reset, thereby reducing the pressure of the support block on the pressure sleeve and the sealing packing. At this time, the wear on the sealing packing during the rotation of the inner tube is reduced, and the service life of the sealing packing is extended.

[0017] 4. The wear-resistant rotary compensator provided in this application has an installation groove on the support block, in which a support spring and a limiting ball are installed. Semi-circular grooves are equidistantly arranged in the inclined groove, and semi-circular grooves are also equidistantly arranged on the face of the pressure sleeve facing the support block. A guide rod with a through hole is fixedly connected to the support block. As the sealing packing wears, the compensating spring compresses the pressure sleeve, causing the pressure sleeve to press against the sealing packing. At this time, the pressure inside the protective bladder and the telescopic bladder will decrease. When the pressure inside the protective bladder and the telescopic bladder decreases to a certain extent, the gas inside the protective bladder and the telescopic bladder cannot push the support block back to its original position, and the position of the guide rod on the support block will also change. The position of the guide rod indicates the compressive force of the compensating spring and the protective bladder on the pressure sleeve and the sealing packing, thus allowing a direct assessment of whether the compensating spring force is sufficient. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0019] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional view of the invention from the axis. Figure 3 For the present invention Figure 2 Enlarged view of the local structure at point A in the middle; Figure 4 For the present invention Figure 2 The right view; Figure 5This is a schematic diagram of the limiting flange facing the pressure sleeve side of the present invention; Figure 6 This is a schematic diagram of the pressure sleeve facing the limiting flange side of the present invention; Figure 7 This is a schematic diagram of the internal structure of the support block of the present invention; Figure 8 For the present invention Figure 1 The left view.

[0020] In the diagram: 1. Outer tube; 101. Limiting ring; 2. Ball bearing; 3. Inner tube; 4. Sealing packing; 5. Pressure sleeve; 6. Limiting flange; 601. Inclined groove; 602. Through hole; 7. Compensating spring; 8. Connecting bolt; 9. Connecting nut; 10. Ring bladder; 11. Threaded tube; 12. Support block; 1201. Mounting groove; 1202. Support spring; 1203. Limiting ball; 13. Protective bladder; 14. Telescopic bladder; 15. Pointing rod; 16. Semicircular groove. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] Example 1 Please see Figures 1-4 A wear-resistant rotary compensator includes an outer tube 1, an inner tube 3, a pressure sleeve 5, and a limiting flange 6. A limiting ring 101 is fixedly installed on the inner wall of the outer tube 1. Several balls 2 are arranged in a ring array on the edge of the limiting ring 101 near the diameter change port of the outer tube 1. The inner tube 3 is movably installed inside the outer tube 1, and a retaining ring at one end of the inner tube 3 is tightly pressed against the balls 2. The other end of the inner tube 3 extends out of the large diameter port of the outer tube 1. The limiting ring 101 and the balls 2 are used to limit the retaining ring of the inner tube 3. The balls 2 are used to reduce the friction between the limiting ring 101 and the retaining ring of the inner tube 3. The outer wall of the inner tube 3 and the inner wall of the outer tube 1 are... There is a gap between them. The gap between the inner wall of the outer tube 1 and the side of the limiting ring 101 away from the reducing port is provided with sealing packing 4. The gap between the outer wall of the inner tube 3 and the inner wall of the outer tube 1 is provided with a pressure sleeve 5. One end of the pressure sleeve 5 is tightly attached to the sealing packing 4. The outer side of the inner tube 3 is movably fitted with a limiting flange 6. The outermost diameters of the outer tube 1, pressure sleeve 5 and limiting flange 6 are the same. The outer tube 1, pressure sleeve 5 and limiting flange 6 are fixedly connected by several sets of connecting bolts 8 and connecting nuts 9. Several compensating springs 7 are provided between the pressure sleeve 5 and the limiting flange 6, and the compensating springs 7 are movably fitted on the connecting bolts 8.

[0023] Please see Figures 2-5A plurality of threaded tubes 11 are arranged in an annular array on the inner tube 3 between the pressure sleeve 5 and the limiting flange 6. The outer side of the threaded tube 11 is externally threaded, and the external thread of the threaded tube 11 is screwed into the inner wall of the inner tube 3 for sealing. An annular bladder 10 is fixedly sleeved on the inner tube 3 between the pressure sleeve 5 and the limiting flange 6. The outer side of the threaded tube 11 is fixedly connected to the annular bladder 10, and the inner side of the threaded tube 11 is connected to the inner tube 3. The side of the annular bladder 10 that is close to the inner tube 3 is connected to the inner side of the inner tube 3 through the threaded tube 11. A plurality of inclined grooves 601 are arranged in an annular array on the side of the limiting flange 6 facing the pressure sleeve 5. A plurality of support blocks 12 are arranged in an annular array between the limiting flange 6 and the pressure sleeve 5. The side of the support block 12 facing the limiting flange 6 is inclined, and the inclined surface of the support block 12 is slidably installed in the inclined groove 601. The other end of the support block 12 is close to the pressure sleeve 5, and the side of the support block 12 that is close to the inner tube 3 is close to the outer wall of the annular bladder 10.

[0024] The inclined groove 601 is a groove that is deeper on the side closer to the axis of the limiting flange 6 and shallower on the side farther away from the axis; the inclined surface of the support block 12 is a surface that is higher on the side closer to the axis of the limiting flange 6 and lower on the side farther away from the axis.

[0025] The annular bladder 10 is an inflatable bladder. When the internal pressure of the inner tube 3 increases, the pressure inside the inner tube 3 can be transmitted to the inside of the annular bladder 10 through the threaded tube 11, thereby causing the annular bladder 10 to expand. The expanded annular bladder 10 can push the support block 12 to slide along the inclined groove 601 toward the connecting bolt 8, so that the support block 12 squeezes the pressure sleeve 5, thereby causing the pressure sleeve 5 to squeeze the sealing packing 4.

[0026] The working principle of Embodiment 1 of the present invention is as follows: Before using rotary compensators, pairs of rotary compensators need to be connected via a pipe seal.

[0027] Please see Figures 1-5When the medium is transported in the pipeline, the pressure inside the pipeline, outer sleeve 1, and inner sleeve 3 will increase. At this time, the pressure inside the inner sleeve 3 will be transmitted to the annular bladder 10 through the threaded pipe 11, causing the annular bladder 10 to expand. The expanded annular bladder 10 will push the support block 12, which is close to the annular bladder 10, to move. That is, the support block 12 moves away from the inner sleeve 3 along the inclined groove 601. Since the inclined groove 601 is a groove that is deeper on the side near the axis of the limiting flange 6 and shallower on the side away from the axis, and the side of the support block 12 facing the limiting flange 6 is inclined, the inclined groove 601 will squeeze the support block 12 to move towards the pressure sleeve 5. During this process, the support block 12 will squeeze the pressure sleeve 5, causing the pressure sleeve 5 to squeeze the sealing packing 4 in the gap between the outer sleeve 1 and the inner tube 3. This squeezes the sealing packing 4, thereby compensating for the wear of the inner and outer sleeves 1 and the inner tube 3, allowing the sealing packing 4 to tightly seal the gap between the outer sleeve 1 and the inner tube 3 and maintain the sealing effect. Furthermore, by squeezing the pressure sleeve 5 by the support block 12, the squeezing force of the inner ring of the pressure sleeve 5 on the sealing packing 4 is compensated, allowing the sealing packing 4 to be subjected to uniform squeezing force, preventing uneven wear caused by uneven squeezing force of the pressure sleeve 5 on the sealing packing 4.

[0028] Example 2 When using the rotary compensator in Embodiment 1, during medium transmission, when the inner tube 3 is under high pressure, the high pressure inside the inner tube 3 pushes the support block 12 to slide along the inclined groove 601, thereby causing the support block 12 to squeeze the pressure sleeve 5, which in turn squeezes the sealing packing 4, ensuring the sealing packing 4 seals the outer tube 1 and the inner tube 3. However, when no medium is being transmitted, the pressure sleeve 5 and the sealing packing 4, which are squeezed by the support block 12, are still being squeezed. At this time, if there is rotation between the outer tube 1 and the inner tube 3, the sealing packing 4 will be further worn and consumed, which is unnecessary consumption. Embodiment 2 is a further improvement based on Embodiment 1.

[0029] Unlike Example 1, please refer to Figure 5 A protective bladder 13 is movably sleeved on the outer side of the compensating spring 7. The protective bladder 13 is filled with high-pressure gas and has a fixed volume, so it will not expand or deform like a balloon. By sleeved with a protective bladder 13 on the outer side of the compensating spring 7, the compensating spring 7 is protected, preventing rust or uneven oxidation of multiple compensating springs 7 after long-term exposure to wind and sun. This also avoids uneven compression of the pressure sleeve 5 and sealing packing 4 by multiple compensating springs 7 due to different elastic coefficients, which would lead to different sealing effects of the sealing packing 4 and abnormal wear of the sealing packing 4.

[0030] Please see Figures 2-5A telescopic bladder 14 is fixedly connected to the side of the protective bladder 13 facing the support block 12. The telescopic bladder 14 is connected to the protective bladder 13. The telescopic bladder 14 cannot produce expansion deformation similar to a balloon. The telescopic bladder 14 can expand and contract axially. The side of the telescopic bladder 14 facing the support block 12 is in close contact with the support block 12.

[0031] The working principle of Embodiment 2 of the present invention is as follows: Please see Figures 1-5 When the rotary compensator is installed and the medium is being transferred, the pressure inside the outer sleeve 1 and the inner sleeve 3 increases. This pressure inside the inner sleeve 3 is then transmitted to the annular bladder 10 through the threaded pipe 11, causing the annular bladder 10 to expand. The expanded annular bladder 10 pushes the support block 12 to move along the inclined groove 601, causing the support block 12 to squeeze the pressure sleeve 5, increasing the pressure of the pressure sleeve 5 on the sealing packing 4 and ensuring the sealing effect of the sealing packing 4. When the medium is not being transferred, the annular bladder 10 does not expand, and the gas pressure inside the protective bladder 13 and the telescopic bladder 14 is higher, causing the telescopic bladder 14 to extend axially. At the same time, the telescopic bladder 14 pushes the support block 12 to move towards the outer wall of the inner sleeve 3, causing the support block 12 to return to its original position. This reduces the pressure of the support block 12 on the pressure sleeve 5 and the sealing packing 4, thus reducing the wear on the sealing packing 4 when the inner sleeve 3 rotates and extending the service life of the sealing packing 4. When transmitting media, the sealing packing 4 is compressed to ensure its sealing effect. When not transmitting media, the compression of the sealing packing 4 is reduced to reduce the friction between the sealing packing 4 and the outer sleeve 1 and inner sleeve 3, thereby reducing the wear of the sealing packing 4.

[0032] Example 3 When overhauling the rotary compensator in Example 2, workers have difficulty making judgments. Example 3 is a further improvement based on Example 2.

[0033] Unlike Example 2, please refer to Figures 1-8 The support block 12 has several mounting grooves 1201 at both ends facing the pressure sleeve 5 and the limiting flange 6. A support spring 1202 is fixedly connected to the bottom end of the mounting groove 1201, and a limiting bead 1203 is fixedly connected to the other end of the support spring 1202. Please refer to [link / reference]. Figure 5 The limiting flange 6 has several sets of semicircular grooves 16 evenly spaced within its inclined groove 601, and these sets of semicircular grooves 16 are arranged radially on the limiting flange 6; please refer to Figure 6 The pressure sleeve 5 has several sets of semi-circular grooves 16 on one side that is close to the support block 12, and the several sets of semi-circular grooves 16 are arranged in the radial direction of the pressure sleeve 5. Please see Figure 2 , Figure 3 and Figure 8A through hole 602 is provided at the middle position of the bottom end of the inclined groove 601. The through hole 602 passes through the limiting flange 6. A guide rod 15 is movably provided in the through hole 602. One end of the guide rod 15 is fixedly connected to the middle position of the support block 12, and the other end of the guide rod 15 passes through and extends out of the through hole 602.

[0034] The support spring 1202 is always in a compressed state. The compressed support spring 1202 provides support force for the limiting bead 1203, preventing the limiting bead 1203 from being squeezed into the mounting groove 1201 by a small force in the semi-circular groove 16.

[0035] The radial distance between several sets of semicircular grooves 16 on the pressure sleeve 5 is equal to the radial distance between several sets of semicircular grooves 16 in the inclined groove 601 of the limiting flange 6. This allows the limiting beads 1203 at both ends of the support block 12 to simultaneously enter the semicircular grooves 16 or simultaneously exit from the semicircular grooves 16.

[0036] The working principle of Embodiment 3 of the present invention is as follows: Please see Figures 1-8 After the rotary compensator is installed and used for a long time, the sealing packing 4 will wear down. The elastic force of the compensating spring 7 will push the pressure sleeve 5 towards the sealing packing 4 to compensate for the wear of the sealing packing 4. During this process, as the compensating spring 7 extends, the protective bladder 13 will gradually return to its original shape (i.e., become relatively longer). The pressure inside the protective bladder 13 and the telescopic bladder 14 will decrease. When the pressure inside the protective bladder 13 and the telescopic bladder 14 decreases to a certain extent, during subsequent medium transmission, the expansion of the ring bladder 10 will push the support block 12 to slide to the moving position. The gas pressure inside the protective bladder 13 and the telescopic bladder 14 will not be able to push the support block 12 back to its original position. At this time, the position of the pointer rod 15 on the support block 12 will also change. During subsequent maintenance, workers can judge the squeezing force of the compensating spring 7 and the protective bladder 13 on the pressure sleeve 5 and the sealing packing 4 by the position of the pointer rod 15, thus intuitively judging whether the compensating elastic force of the compensating spring 7 is sufficient.

Claims

1. A wear-resistant rotary compensator, comprising an outer sleeve (1), ball bearings (2), an inner tube (3), sealing packing (4), a pressure sleeve (5), a limiting flange (6), and a compensating spring (7), characterized in that: A space is provided between the pressure sleeve (5) and the limiting flange (6): Several threaded tubes (11) are arranged in a ring array on the inner tube (3) between the pressure sleeve (5) and the limiting flange (6), and one end is connected to the inside of the inner tube (3); The ring bladder (10) is fixedly sleeved on the inner tube (3) between the pressure sleeve (5) and the limiting flange (6), and is connected to the other end of the threaded tube (11); The limiting flange (6) has several inclined grooves (601) arranged in a ring array on the side facing the pressure sleeve (5). A plurality of support blocks (12) are arranged in a ring array between the limiting flange (6) and the pressure sleeve (5). The side of the support block (12) facing the limiting flange (6) is inclined. The inclined side of the support block (12) is slidably installed in the inclined groove (601). The other end of the support block (12) is in close contact with the pressure sleeve (5). The side of the support block (12) near the inner tube (3) is in close contact with the outer wall of the annular bladder (10). The annular bladder (10) is an inflatable bladder. The inclined groove (601) is a groove that is deep on the side near the axis of the limiting flange (6) and shallow on the side away from the axis; the inclined surface of the support block (12) is a surface that is high on the side near the axis of the limiting flange (6) and low on the side away from the axis. The protective bladder (13) is movably sleeved on the outside of the compensation spring (7). The protective bladder (13) is filled with high-pressure gas. The volume of the protective bladder (13) is constant and will not expand or deform. A telescopic bladder (14) is fixedly connected to the side of the protective bladder (13) facing the support block (12). The telescopic bladder (14) is connected to the protective bladder (13). The telescopic bladder (14) cannot expand or deform. The telescopic bladder (14) can expand and contract in the axial direction. The side of the telescopic bladder (14) facing the support block (12) is close to the support block (12).

2. The wear-resistant rotary compensator according to claim 1, characterized in that: The support block (12) is provided with: Several mounting grooves (1201) are respectively opened at both ends of the support block (12) facing the pressure sleeve (5) and the limiting flange (6); one end of the support spring (1202) is fixedly connected to the bottom end of the mounting groove (1201); the limiting bead (1203) is fixedly connected to the other end of the support spring (1202); several sets of semi-circular grooves (16) are equally spaced in the inclined groove (601) of the limiting flange (6), and the several sets of semi-circular grooves (16) are arranged in the radial direction of the limiting flange (6); several sets of semi-circular grooves (16) are opened on one side of the pressure sleeve (5) close to the support block (12), and the several sets of semi-circular grooves (16) are arranged in the radial direction of the pressure sleeve (5).

3. The wear-resistant rotary compensator according to claim 2, characterized in that: A through hole (602) is provided at the middle position of the bottom end of the inclined groove (601). The through hole (602) passes through the limiting flange (6). A guide rod (15) is movably provided in the through hole (602). One end of the guide rod (15) is fixedly connected to the middle position of the support block (12), and the other end of the guide rod (15) passes through and extends out of the through hole (602).

4. The wear-resistant rotary compensator according to claim 3, characterized in that: The support spring (1202) is always in a compressed state.

5. The wear-resistant rotary compensator according to claim 4, characterized in that: The radial distance between several sets of semicircular grooves (16) on the pressure sleeve (5) is equal to the radial distance between several sets of semicircular grooves (16) in the inclined groove (601) of the limiting flange (6).

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