A telescoping nipple and manifold system

Abstract

The application relates to a telescopic short section which comprises a shell and a core barrel, the shell is internally provided with a fluid passage and a moving passage, the fluid passage is a straight passage or a bent passage, the moving passage is a straight passage and is communicated with the fluid passage, one end of the shell provided with the moving passage is internally threaded, a pair of protruding platforms are spaced apart on the outer wall of the core barrel, the outer sleeve of the core barrel between the protruding platforms is provided with a cap, the cap is externally threaded, one end of the core barrel is inserted into the moving passage, the external thread and the internal thread are matched to form a threaded pair connection, the core barrel can rotate and axially move relative to the shell, and the core barrel and the shell are sealingly matched through a sealing element. When the installation pipe manifold system has an inappropriate distance, the telescopic short section can effectively solve the problem that the traditional pipe manifold system connection has high requirements on equipment position accuracy without repeatedly adjusting the equipment placement position and the pipe manifold specification, the convenience of connection is ensured, the telescopic short section has simple structure, is convenient to maintain and easy to operate.

Description

Technical Field

[0001] This invention relates to the field of oil and gas drilling equipment technology, and in particular to a telescopic sub and manifold system. Background Technology

[0002] High-pressure manifold systems are specialized equipment used to collect and transport cementing fluid and fracturing fluid discharged from cementing pumps and fracturing pumps, as well as high-pressure fluids returning from the formation. During operation, the pump outlet is connected to the main pipeline via a high-pressure flexible elbow and high-pressure pipeline. Because the length of the manifold system is fixed at the factory, during the connection process, situations often arise where the length of the intermediate connection section is unsuitable. The adjustment range of the manifold system is limited, and repeated adjustments to the equipment placement and manifold specifications are frequently required due to unsuitable distances, making it very inconvenient to use and reducing the installation efficiency of the manifold system.

[0003] Meanwhile, since the existing method uses unicorn threaded connections, it requires hammering to tighten during installation. Under operating conditions, the threads are prone to damage and breakage, resulting in poor safety performance. Furthermore, due to the limitations of thread specifications and dimensions, the pipe manifold system has a relatively small diameter, resulting in a very low fluid transport capacity.

[0004] Therefore, there is an urgent need for a technical solution to address the aforementioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to address the problems in existing technologies where the length of the manifold system is fixed at the factory, often resulting in unsuitable intermediate connection sections during connection. This limits the adjustment range of the manifold system, frequently requiring repeated adjustments to equipment placement and manifold specifications due to unsuitable distances, making it very inconvenient and reducing installation efficiency. The invention provides an expansion joint and manifold system that effectively solves the problem of high precision requirements for equipment positioning in traditional manifold system connections, ensuring convenient connection.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A telescopic sub includes a housing and a core. The housing has a fluid channel and a moving channel. The fluid channel can be a straight channel or a curved channel. The moving channel is a straight channel and communicates with the fluid channel. The housing has an internal thread at one end where the moving channel is located. A pair of protrusions are spaced apart on the outer wall of the core. A cap is fitted over the core between the protrusions. The cap has an external thread. One end of the core is inserted into the moving channel. The external thread and the internal thread cooperate to form a threaded connection. The core can rotate and move axially relative to the housing. The core and the housing are sealed together by a sealing element.

[0008] The telescopic sub-joint of this invention limits the telescopic length of the core cylinder relative to the outer shell by limiting the cap with a pair of protrusions. The position of the cap relative to the outer shell is adjusted through the threaded connection between the cap and the outer shell. When the distance in the manifold system is unsuitable, it is not necessary to repeatedly adjust the equipment placement and manifold specifications. By rotating the cap to change the mating length between the outer shell and the core cylinder, the length of the telescopic sub-joint can be changed, effectively solving the problem of high equipment positioning accuracy requirements in traditional manifold system connections and ensuring convenient connection. By setting the fluid channel with straight or curved channels, the corresponding outer shell can be a straight head or a curved head, making it compatible with a wider range of applications in manifold systems. This telescopic sub-joint has a simple structure, is easy to maintain, easy to operate, and has a long service life.

[0009] Preferably, the diameter of the moving channel is larger than the diameter of the fluid channel, and the inner diameter of the core cylinder matches the diameter of the fluid channel.

[0010] Preferably, the inner wall of the moving channel is provided with a sealing step assembly, the sealing step assembly is located between the internal thread and the fluid channel, the outer wall of the core cylinder is provided with a sealing surface that mates with the sealing step assembly, the sealing element is provided between the sealing step assembly and the sealing surface, and the length of the sealing surface is greater than the length of the sealing step assembly.

[0011] More preferably, the diameter of the internal thread is greater than the maximum diameter of the sealing step assembly.

[0012] More preferably, the sealing step assembly includes a first sealing step and a second sealing step, the first sealing step being close to the fluid channel, the second sealing step being close to the internal thread, and the length of the internal thread being less than the length of the first sealing step.

[0013] More preferably, the diameter of the second sealing step is larger than the diameter of the first sealing step.

[0014] More preferably, an observation hole is provided between the second sealing step and the internal thread, the observation hole being connected to the inner and outer walls of the housing, and the observation hole being used to determine whether the sealing element has failed to seal by checking for leakage.

[0015] More preferably, the sealing element includes a high-pressure seal and at least one sealing ring, the sealing ring being disposed between the first sealing step and the sealing surface, and the high-pressure seal being disposed between the second sealing step and the sealing surface.

[0016] More preferably, the sealing surface is provided with sealing grooves, the number of which matches the number of sealing rings, and the sealing grooves are used to set the sealing rings.

[0017] More preferably, the telescopic section further includes a pressure cap, which is connected to the inner wall of the moving channel via a threaded connection, and the pressure cap is used to compress the high-pressure seal.

[0018] More preferably, one end face of the pressure cap is provided with a protrusion, the protrusion cooperates with the second sealing step, and the pressure cap squeezes the high-pressure seal through the protrusion.

[0019] With this structure, an installation groove is formed between the second sealing step and the protrusion. The high-pressure seal is placed in the installation groove. The size of the installation groove is adjusted by adjusting the tightness of the pressure cap, so that the high-pressure seal can deform in the installation groove and abut well against the sealing surface and the second sealing step, satisfying static sealing in a stationary state and dynamic sealing in a rotating state, preventing leakage of high-pressure fluid in the inner cavity.

[0020] More preferably, the pressure cap has several grooves on the other end face opposite to the protrusion. The pressure cap is installed and removed inside the housing by twisting the grooves with a tool, and the pressure cap is twisted to squeeze the high-pressure seal to seal the housing and the core cylinder.

[0021] Preferably, at least one end of the cap is fitted with a shock-absorbing element, which is disposed in contact with the protrusion.

[0022] With this structure, when the length of the telescopic sub is adjusted to meet the requirements and connected to the manifold system, the axial force generated by the vibration acts on the damping element when the manifold vibrates, thereby driving the cap to rotate relative to the outer shell, finely adjusting the length of the telescopic sub, and reducing or eliminating the vibration of the high-pressure manifold.

[0023] More preferably, the shock-absorbing element is a spring, an elastic pad, or a damping block.

[0024] More preferably, the outer walls of the core cylinder at both ends of the cap are respectively provided with a core-filling groove and an installation step. The core-filling groove is fitted with a core-filling element. The core cylinder between the core-filling element and the installation step is provided with a shock-absorbing element. One end of the shock-absorbing element abuts against one end of the cap, and the other end of the shock-absorbing element abuts against the installation step and / or the core-filling element. That is, the core-filling element and the installation step form a pair of protrusions.

[0025] More preferably, the cap has a protrusion that matches the end of the housing. The protrusion is used to control the length of the cap extending into the moving channel, thereby protecting the external and internal threads from damage and stabilizing the rotation and axial movement of the core relative to the housing. The protrusion also facilitates the screwing of the cap, making it easier to adjust the length of the telescopic section.

[0026] Preferably, the telescopic section further includes a flange ring, the other end of the core cylinder is inserted into the inner annular surface of the flange ring, the core cylinder is rotatable relative to the flange ring, and the end of the outer shell where the fluid passage is located is provided with a flange.

[0027] By adopting this structure, the existing threaded connection is changed to a flange connection by setting the flange ring and the flange at the end of the shell, the diameter of the high-pressure manifold is increased, the efficiency of the high-pressure manifold in transporting fluid is effectively improved, and flexible expansion and contraction and reliable connection can be achieved at the same time.

[0028] More preferably, a plurality of balls are evenly distributed circumferentially along the rotational mating surface of the core cylinder and the flange ring, and the core cylinder is provided with ball grooves for accommodating the balls;

[0029] Alternatively, the flange ring may be provided with ball grooves for accommodating the balls;

[0030] Alternatively, the core cylinder may have a first ball bearing half-groove and the flange ring may have a second ball bearing half-groove, the ball bearing groove formed by the first ball bearing half-groove and the second ball bearing half-groove is used to set the ball bearing.

[0031] The first ball bearing half-groove and the second ball bearing half-groove form a complete ball bearing groove, and the dimensions of the first ball bearing half-groove and the second ball bearing half-groove can be set according to actual needs.

[0032] More preferably, the ball is a steel ball.

[0033] More preferably, the flange ring is provided with a ball mounting hole corresponding to the ball groove, and a plug is provided in the ball mounting hole for positioning the ball.

[0034] The present invention also provides a manifold system comprising a plurality of interconnected pipes, wherein two adjacent pipes are connected by a telescoping joint as described in any of the preceding claims.

[0035] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0036] 1. The telescopic short section of the present invention limits the telescopic length of the core cylinder relative to the outer shell by limiting the cap by a pair of protrusions. The position of the cap relative to the outer shell is adjusted by the threaded connection between the cap and the outer shell. When the distance of the manifold system is not suitable, it is not necessary to repeatedly adjust the equipment placement and manifold specifications. By rotating the cap to change the mating length between the outer shell and the core cylinder, the length of the telescopic short section can be changed, which can effectively solve the problem of high equipment positioning accuracy requirements in traditional manifold system connections and ensure the convenience of connection.

[0037] 2. The telescopic sub-section of the present invention, by setting the fluid channel with a straight channel or a curved channel, makes the corresponding outer shell a straight head or a curved head, so that it can meet a wider range of application requirements in the manifold system;

[0038] 3. A preferred embodiment of the present invention is a telescopic short section, which, by setting the flange ring and the flange at the end of the outer shell, changes the existing threaded connection to a flange connection, increases the diameter of the high-pressure manifold, effectively improves the efficiency of the high-pressure manifold in transporting fluid, and can simultaneously achieve flexible telescopic and reliable connection.

[0039] 4. The telescopic short section of the present invention, when the length of the telescopic short section is adjusted to meet the requirements and connected to the manifold system, when the manifold vibrates, the axial force generated by the vibration acts on the damping element, thereby driving the cap to rotate relative to the outer shell, and finely adjusting the length of the telescopic short section to reduce or eliminate the vibration of the high-pressure manifold.

[0040] 5. The telescopic joint described in this invention has a simple structure, is easy to maintain, easy to operate, and has a long service life. Attached Figure Description

[0041] Figure 1 Schematic diagram of the cross-sectional structure of the telescopic sub. Figure 1 ;

[0042] Figure 2 Schematic diagram of the cross-sectional structure of the telescopic sub-section Figure 2 ;

[0043] Figure 3 for Figure 1 Schematic diagram of the structure of part A in the middle;

[0044] Figure 4 This is a schematic diagram of the outer shell structure;

[0045] Figure 5 This is a schematic diagram of the core tube structure;

[0046] Figure 6 This is a schematic diagram of the cap structure;

[0047] Figure 7 This is a schematic diagram of the flange ring structure;

[0048] Figure 8 This is a schematic diagram of the cap structure;

[0049] Figure 9 Schematic diagram of the cross-sectional structure of the telescopic sub-section Figure 3 ;

[0050] Figure 10 Schematic diagram of the cross-sectional structure of the telescopic sub-section Figure 4 .

[0051] The markings in the diagram are: 1-outer shell, 2-core cylinder, 3-pressure cap, 4-repair core, 5-shock damping element, 6-joint cap, 7-flange ring, 8-inspection hole, 9-sealing ring, 10-high pressure seal, 11-retaining ring, 12-plug, 13-ball, 14-first sealing step, 15-second sealing step, 16-sealing groove, 17-repair core groove, 18-first ball half groove, 19-groove, 20-protrusion, 21-ball mounting hole, 22-second ball half groove, 23-external thread, 24-fluid passage, 25-moving passage, 26-protrusion. Detailed Implementation

[0052] The present invention will now be described in detail with reference to the accompanying drawings.

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0054] Example 1

[0055] like Figures 1 to 10 As shown, the telescopic section of the present invention includes a housing 1, a core cylinder 2, and a flange ring 7.

[0056] The outer casing 1 is provided with a fluid channel 24 and a moving channel 25. The fluid channel 24 is either a straight channel or a curved channel, meaning the angle between the inlet axis and the outlet axis of the fluid channel 24 ranges from 0° to 180°. Specifically, when the angle is 0°, the fluid channel 24 is a straight channel; when the angle is 90°, the fluid channel 24 is an L-shaped curved channel; and when the angle is 180°, the fluid channel 24 is a U-shaped curved channel (not shown). Figure 1 , Figure 2 and Figure 4 The fluid channel 24 shown is a straight channel, and the corresponding outer casing 1 is a direct head, as shown. Figure 9 The fluid channel 24 shown is an L-shaped bend channel, such as... Figure 10The fluid channel 24 shown is a zigzag bend channel, and the corresponding outer shell 1 is a bend joint.

[0057] like Figure 1 , Figure 2 , Figure 4 , Figure 9 and Figure 10 As shown, the moving channel 25 is a straight channel and is connected to the fluid channel 24. The connecting end of the moving channel 25 and the fluid channel 24 and the connecting end of the fluid channel 24 and the moving channel 25 are coaxially arranged, and the diameter of the moving channel 25 is larger than the diameter of the fluid channel 24.

[0058] like Figure 1 , Figure 2 , Figure 4 , Figure 9 and Figure 10 As shown, the outer casing 1 has a flange at one end where the fluid channel 24 is located, and an internal thread at one end where the moving channel 25 is located. The inner wall of the moving channel 25 has a sealing step assembly located between the internal thread and the fluid channel 24. The diameter of the internal thread is larger than the maximum diameter of the sealing step assembly. The sealing step assembly includes a first sealing step 14 and a second sealing step 15. The first sealing step 14 is close to the fluid channel 24, and the second sealing step 15 is close to the internal thread. The diameter of the second sealing step 15 is larger than the diameter of the first sealing step 14. The length of the internal thread is smaller than the length of the first sealing step 14. An observation hole 8 is provided between the second sealing step 15 and the internal thread. The observation hole 8 connects the inner and outer walls of the outer casing 1. The end faces of the flange and the flange ring 7 are provided with flange sealing grooves and threaded holes for flange connection.

[0059] like Figures 1 to 5 , Figure 9 and Figure 10As shown, the core cylinder 2 is a straight pipe, meaning that the inlet axis and outlet axis of the core cylinder 2 coincide. The inner diameter of the core cylinder 2 matches the diameter of the fluid channel 24. The outer wall of the core cylinder 2 has several steps that gradually increase in size from one end to the other, namely a sealing surface, a first mounting surface, and a second mounting surface. The sealing surface and the sealing step assembly cooperate. A sealing element is disposed between the sealing step assembly and the sealing surface. The length of the sealing surface is greater than the length of the sealing step assembly. The sealing element includes a high-pressure seal 10 and at least one sealing ring 9. The high-pressure seal 10 is located between the first sealing step 14 and the sealing surface, and between the second sealing step 15 and the sealing surface. The end of the sealing surface is provided with at least one sealing groove 16. The first mounting surface is provided with a core-filling groove 17 at one end near the sealing groove 16 and a mounting step at the other end. The second mounting surface is provided with a first ball bearing half-groove 18 and a limiting step. The first ball bearing half-groove 18 includes several and is evenly distributed along the circumference of the second mounting surface. The limiting step is a ring-shaped step. The first ball bearing half-groove 18 is located between the limiting step and the mounting step.

[0060] like Figure 1 , Figure 2 , Figure 7 , Figure 9 and Figure 10 As shown, the inner ring surface of the flange ring 7 is provided with a second ball bearing half groove 22 and a limiting groove. The second ball bearing half groove 22 corresponds one-to-one with the first ball bearing half groove 18 and can cooperate to form a ball bearing groove. The first ball bearing half groove 18 and the second ball bearing half groove 22 form a complete ball bearing groove. The size of the first ball bearing half groove 18 and the second ball bearing half groove 22 can be set according to actual needs. It can be a half-and-half distribution, a 46-way distribution, or a 37-way distribution. The flange ring 7 is provided with a ball bearing mounting hole 21 corresponding to the second ball bearing half groove 22. The ball bearing mounting hole 21 is used to place the ball bearing 13 into the ball bearing groove. A plug 12 is provided in the ball bearing mounting hole 21. The plug 12 is used to position the ball bearing 13 in the ball bearing groove. The limiting groove is a ring groove.

[0061] During assembly, the flange ring 7 is first slipped onto the second mounting surface from the small end of the core cylinder 2. The limiting step matches the limiting groove. The second ball bearing half-groove 22 and the first ball bearing half-groove 18 cooperate to form the ball bearing groove. Then, the ball bearing 13 is inserted into the ball bearing groove through the ball bearing mounting hole 21. Then, the plug 12 is fixed in the ball bearing mounting hole 21, with the end of the plug 12 abutting against the ball bearing 13. A retaining ring 11 is set on the surface of the ball bearing mounting hole 21 to fix the plug 12, so that the core cylinder 2 can rotate relative to the flange ring 7. The second mounting surface is the rotational mating surface of the flange ring 7 and the core cylinder 2. The flange ring 7 is unidirectionally positioned by the cooperation of the limiting step and the limiting groove. The ball bearing 13 is used to position the flange ring 7 on the core cylinder 2 and to convert some rotational friction into rolling friction, thereby reducing frictional resistance, delaying component wear, and extending the service life of the components. In this embodiment, the ball bearing 13 is a steel ball.

[0062] like Figure 1 , Figure 2 , Figure 9 and Figure 10 As shown, a core 4 is matched and disposed on the core groove 17. The core 4 and the mounting step form a pair of spaced protrusions on the first mounting surface. A cap 6 is sleeved on the first mounting surface between the protrusions. The cap 6 fits onto the first mounting surface. The two ends of the cap 6 can have a gap relative to the protrusions. When the two ends of the cap 6 have the gap relative to the protrusions, the core cylinder 2 can extend and retract relative to the outer shell 1 in the initial state. The length of the extension and retraction is determined by the size of the gap. The core 4 and the mounting step limit the cap 6. Figure 8 As shown, the cap 6 is provided with an external thread 23 and a protrusion 26, the protrusion 26 being located between the end of the outer shell 1 and the mounting step.

[0063] During assembly, after the flange ring 7 is installed, the cap 6 is inserted from the small end of the core cylinder 2 onto the first mounting surface, and then the core 4 is installed on the core groove 17.

[0064] like Figures 1 to 4 , Figure 9 and Figure 10 As shown, the number of sealing grooves 16 matches the number of sealing rings 9. The sealing grooves 16 are used to set the sealing rings 9. A pressure cap 3 is provided inside the outer shell 1. The pressure cap 3 is connected to the inner wall of the moving channel 25 through a threaded pair. The pressure cap 3 is used to compress the high-pressure sealing element 10, such as... Figure 6As shown, one end face of the pressure cap 3 has a protrusion 20, which cooperates with the second sealing step 15. The pressure cap 3 squeezes the high-pressure sealing element 10 through the protrusion 20. The other end face of the pressure cap 3 opposite to the protrusion 20 has several grooves 19. The pressure cap 3 is installed and removed in the housing 1 by twisting the grooves 19 with a tool, and the pressure cap 3 is twisted to squeeze the high-pressure sealing element 10 to seal the housing 1 and the core cylinder 2. With this structure, an installation groove is formed between the second sealing step 15 and the protrusion 20. The high-pressure sealing element 10 is placed in the installation groove. The size of the installation groove is adjusted by adjusting the tightness of the pressure cap 3, so that the high-pressure sealing element 10 can deform in the installation groove and can well abut against the sealing surface and the second sealing step 15, satisfying the static sealing in the stationary state and the dynamic sealing in the rotating state, preventing the high-pressure fluid in the inner cavity from leaking. The observation hole 8 is used to determine whether the sealing element has failed to seal by checking for leakage.

[0065] During assembly, the sealing ring 9 is installed on the sealing groove 16, the high-pressure sealing element 10 is installed on the second sealing step 15, and the pressure cap 3 is tightened. After the cap 6 and the supplementary core 4 are installed, the small end of the core cylinder 2 is inserted into the moving channel 25, so that the sealing surface and the sealing step assembly are in a sealing sliding fit. The external thread 23 and the internal thread are engaged to form a threaded pair connection, connecting the core cylinder 2 and the outer shell 1. At this time, the core cylinder 2 can rotate and move axially relative to the outer shell 1. The core cylinder 2 and the outer shell 1 are sealed and engaged by the sealing element. The protrusion 26 is matched to the end of the outer shell 1. The protrusion 26 is used to control the length of the cap 6 extending into the moving channel 25, thereby protecting the external thread 23 and the internal thread from being damaged, making the rotation and axial movement of the core cylinder 2 relative to the outer shell 1 stable. At the same time, the protrusion 26 also facilitates the screwing of the cap 6, making it easy to adjust the length of the telescopic short section.

[0066] The telescopic sub-section described in this embodiment limits the telescopic length of the core cylinder 2 relative to the outer shell 1 by limiting the cap 6 with a pair of protrusions. The position of the cap 6 relative to the outer shell 1 is adjusted through the threaded connection between the cap 6 and the outer shell 1. When the distance in the manifold system is unsuitable, it is not necessary to repeatedly adjust the equipment placement and manifold specifications. By rotating the cap 6 to change the mating length between the outer shell 1 and the core cylinder 2, the length of the telescopic sub-section can be changed, effectively solving the problem of high equipment positioning accuracy requirements in traditional manifold system connections and ensuring convenient connection. By setting the fluid channel 24 with a straight or curved channel, the corresponding outer shell 1 can be a straight head or a curved head, making it compatible with a wider range of applications in the manifold system. By setting the flange ring 7 and the flange at the end of the outer shell 1, the existing unithreaded connection is changed to a flange connection, increasing the high-pressure manifold diameter and effectively improving the efficiency of high-pressure manifold fluid transportation. It can simultaneously achieve flexible telescopic connection and reliable connection. This telescopic sub-section has a simple structure, is easy to maintain, easy to operate, and has a long service life.

[0067] Example 2

[0068] The telescopic section of the present invention differs from that of Embodiment 1 in that, in this embodiment, the core cylinder 2 is provided with a ball groove for accommodating the ball 13, or the flange ring 7 is provided with a ball groove for accommodating the ball 13.

[0069] Example 3

[0070] The telescopic short section of the present invention, based on embodiment 1 or embodiment 2, in this embodiment, at least one end of the cap 6 is fitted with a shock-absorbing element 5, which is a spring, an elastic pad, or a damping block.

[0071] The shock-absorbing element 5 is sleeved on the first mounting surface, one end of the shock-absorbing element 5 abuts against one end of the cap 6, and the other end of the shock-absorbing element 5 abuts against the mounting step and / or the core 4.

[0072] In one specific implementation, such as Figure 1 , Figure 2 , Figure 9 and Figure 10 As shown, the two ends of the cap 6 are respectively fitted with the shock-absorbing element 5, the first shock-absorbing element 5 abuts against the mounting step, the two ends of the cap 6 abut against the two shock-absorbing elements 5 respectively, the core 4 abuts against the second shock-absorbing element 5, and the protrusion 26 is located at the end near the first shock-absorbing element 5.

[0073] During assembly, after the flange ring 7 is installed, the first damping element 5, the cap 6, and the second damping element 5 are sequentially inserted onto the first mounting surface from the small end side of the core cylinder 2. The first damping element 5 abuts against the mounting step. Then, the core 4 is installed on the core groove 17, and the core 4 abuts against the second damping element 5.

[0074] The telescopic sub-section described in this embodiment uses a damping element 5 disposed between at least one of the protrusions and the cap 6. When the length of the telescopic sub-section is adjusted to meet the requirements and connected to the manifold system, the axial force generated by the vibration acts on the damping element 5 when the manifold vibrates, thereby driving the cap 6 to rotate relative to the outer shell 1, thus finely adjusting the length of the telescopic sub-section and reducing or eliminating the vibration of the high-pressure manifold.

[0075] Example 4

[0076] like Figures 1 to 10 As shown, the manifold system of the present invention includes a plurality of connected pipes, wherein some adjacent two pipes are connected by a telescopic joint as described in any of Embodiments 1 to 3.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A telescopic sub, comprising a housing (1) and a core cylinder (2), characterized in that, The outer casing (1) is provided with a fluid channel (24) and a moving channel (25). The fluid channel (24) is a straight channel or a curved channel. The moving channel (25) is a straight channel and communicates with the fluid channel (24). One end of the outer casing (1) where the moving channel (25) is located is provided with an internal thread. A pair of protrusions are spaced apart on the outer wall of the core cylinder (2). The core cylinder (2) between the protrusions is covered with a cap (6). Both ends of the cap (6) abut against a shock-absorbing element (5). The shock-absorbing element (5) abuts against the protrusions. The cap (6) is provided with an external thread (23). One end of the core cylinder (2) is inserted into the moving channel (25). The external thread (23) is engaged with the internal thread. The core cylinder (2) can rotate and move axially relative to the outer shell (1). The core cylinder (2) and the outer shell (1) are sealed together by a sealing element. When the manifold where the telescopic sub is located vibrates, the axial force generated by the vibration acts on the damping element (5), thereby driving the cap (6) to rotate relative to the outer shell (1) to finely adjust the length of the telescopic sub and reduce or eliminate the vibration of the high-pressure manifold.

2. The telescopic subsection according to claim 1, characterized in that, The inner wall of the moving channel (25) is provided with a sealing step group, which is located between the internal thread and the fluid channel (24). The outer wall of the core cylinder (2) is provided with a sealing surface that cooperates with the sealing step group. The sealing element is provided between the sealing step group and the sealing surface. The length of the sealing surface is greater than the length of the sealing step group.

3. The telescopic sub section according to claim 2, characterized in that, The sealing step assembly includes a first sealing step (14) and a second sealing step (15), the first sealing step (14) being close to the fluid channel (24), and the second sealing step (15) being close to the internal thread, the length of the internal thread being less than the length of the first sealing step (14).

4. The telescopic subsection according to claim 3, characterized in that, The sealing element includes a high-pressure seal (10) and at least one sealing ring (9), the sealing ring (9) being disposed between the first sealing step (14) and the sealing surface, and the high-pressure seal (10) being disposed between the second sealing step (15) and the sealing surface.

5. The telescopic subsection according to claim 4, characterized in that, It also includes a pressure cap (3), which is connected to the inner wall of the moving channel (25) by a threaded pair, and the pressure cap (3) is used to squeeze the high-pressure seal (10).

6. The telescopic subsection according to claim 1, characterized in that, The shock-absorbing element (5) is a spring, an elastic pad, or a damping block.

7. The telescopic sub section according to claim 1, characterized in that, The outer walls of the core cylinder (2) at both ends of the cap (6) are respectively provided with a core filling groove (17) and an installation step. The core filling groove (17) is fitted with a core filling (4). The core cylinder (2) between the core filling (4) and the installation step is provided with a shock-absorbing element (5). One end of the shock-absorbing element (5) abuts against one end of the cap (6), and the other end of the shock-absorbing element (5) abuts against the installation step and / or the core filling (4).

8. The telescopic sub section according to any one of claims 1-7, characterized in that, It also includes a flange ring (7), the other end of the core cylinder (2) is inserted into the inner ring surface of the flange ring (7), the core cylinder (2) can rotate relative to the flange ring (7), and the outer shell (1) is provided with a flange at one end where the fluid channel (24) is located.

9. The telescopic subsection according to claim 8, characterized in that, A plurality of balls (13) are evenly distributed around the rotational mating surface of the core cylinder (2) and the flange ring (7), and the core cylinder (2) is provided with ball grooves for accommodating the balls (13); Alternatively, the flange ring (7) may be provided with a ball groove for accommodating the ball (13); Alternatively, the core cylinder (2) is provided with a first ball bearing half groove (18), and the flange ring (7) is provided with a second ball bearing half groove (22). The ball bearing groove formed by the first ball bearing half groove (18) and the second ball bearing half groove (22) is used to set the ball bearing (13).

10. The telescopic subsection according to claim 9, characterized in that, The flange ring (7) is provided with a ball mounting hole (21) corresponding to the ball groove. A plug (12) is provided in the ball mounting hole (21) and the plug (12) is used to position the ball (13).

11. A manifold system comprising a plurality of interconnected pipes, characterized in that, Some of these adjacent pipes are connected by a telescopic joint as described in any one of claims 1-10.

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