A large-diameter connection expansion joint

Abstract

The present application relates to the technical field of high-pressure manifold, in particular to a telescopic joint for large-diameter connection, which comprises a telescopic straight pipe and a four-way pipe; the telescopic straight pipe comprises an outer pipe and an inner pipe; one end of the inner pipe is connected with the four-way pipe; the other end is sleeved in the outer pipe; the outer wall of the inner pipe is provided with an annular slider one and an annular slider two, and an annular slider three is arranged on the annular slider two; the inner wall of the outer pipe is provided with a telescopic cavity one, a telescopic cavity two and a telescopic cavity three matched with the annular slider one, the annular slider two and the annular slider three respectively; a threaded hole is arranged on the annular slider three, a screw rod is connected in the threaded hole, one end of the screw rod is fixed on the side wall of the telescopic cavity three and can rotate relative to the side wall of the telescopic cavity three, the other end of the screw rod penetrates through the end of the outer pipe, the inner pipe and the outer pipe are fixed by bolts, and the bolts are located in the telescopic cavity two. The position of the inner pipe relative to the outer pipe can be adjusted by rotating the screw rod to adjust the length of the telescopic straight pipe, so that the problem that the length of the existing telescopic joint is not easy to adjust is solved.

Description

Technical Field

[0001] This invention relates to the field of high-pressure manifold technology, and specifically to an expansion joint for large-diameter connections. Background Technology

[0002] Currently, there are three main connection methods for the high-pressure manifold between the fracturing pump and the wellhead in domestic fracturing operations: The first is a complete connection using 3-inch high-pressure pipelines; the second is a large-diameter connection from the high-pressure manifold skid to the diversion skid, with 3-inch high-pressure pipelines connecting the fracturing pump to the high-pressure manifold skid and between the diversion skid and the wellhead; the third is a connection only between the fracturing pump and the high-pressure manifold skid using 3-inch high-pressure pipelines, with all other connections using large-diameter pipelines. This method offers advantages such as cleaner pipeline layout, fewer leakage points, and less pipeline friction. However, the expansion joint length is difficult to adjust, resulting in poor flexibility. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies and provide a large-diameter expansion joint to solve the problem of the difficulty in adjusting the length of existing expansion joints, making them more flexible in use.

[0004] The technical solution of this invention is as follows: An expansion joint for large-diameter connections includes an expansion straight pipe and a four-way connector. The expansion straight pipe includes an outer pipe and an inner pipe. One end of the inner pipe is connected to the four-way connector, and the other end is fitted inside the outer pipe. The outer wall of the inner pipe is provided with annular slider 1 and annular slider 2, and annular slider 3 is provided on annular slider 2. The inner wall of the outer pipe has expansion cavities 1, 2, and 3 respectively, which match annular slider 1, annular slider 2, and annular slider 3. Annular slider 3 has a threaded hole, and a screw is connected to the threaded hole. One end of the screw is fixed to the side wall of expansion cavity 3 and can rotate relative to the side wall of expansion cavity 3. The other end of the screw passes through the end of the outer pipe. The inner pipe and the outer pipe are fixed together by bolts, with the bolts located in expansion cavity 2. In use, rotating the screw moves annular slider 3 along the inner wall of expansion cavity 3, thereby adjusting the position of the inner pipe relative to the outer pipe. After adjusting the position, the bolts are sequentially inserted into the end of the outer pipe, expansion cavity 2, and annular slider 2 to further fix the outer pipe and the inner pipe. The above technical solution not only facilitates the length adjustment of the telescopic straight tube, but also plays a dual role in fixing the inner and outer tubes.

[0005] Furthermore, seals are provided on both sides of the first telescopic cavity, both sides of the second telescopic cavity, and both sides of the third telescopic cavity. The seals include seal one, seal two, seal three, and seal four. When adjusting the relative position between the inner tube and the outer tube, seal one, seal two, seal three, and seal four can always ensure the sealing between the inner tube and the outer tube.

[0006] Furthermore, the first annular slider is parallel to the central axis of the telescopic straight tube, and the third annular slider is perpendicular to the central axis of the telescopic straight tube.

[0007] Furthermore, the annular slider is connected to the outer wall of the inner tube via an annular disk.

[0008] Furthermore, the telescopic cavity is an L-shaped structure, and the annular slider is in close contact with the inner wall of the telescopic cavity, which is beneficial to the stability of the inner tube.

[0009] Furthermore, the annular slider, the annular disk, and the outer wall of the inner tube are integrally connected.

[0010] Furthermore, blind holes are provided at both ends of the annular slider, and the bolt is threaded into the blind holes to fix the inner tube and the outer tube.

[0011] The beneficial effects of the present invention are as follows: The expansion joint for large-diameter connection described in the present invention can adjust the position of the inner tube relative to the outer tube by rotating the screw. After the position is adjusted, the outer tube and the inner tube are fixed again by bolts, which facilitates the adjustment of the length of the expansion straight tube while ensuring a more stable connection between the inner tube and the outer tube. Attached Figure Description

[0012] Figure 1 This is a schematic diagram illustrating the structural principle of the expansion joint for large-diameter connections according to the present invention. Figure 2 This is a schematic diagram of the inner tube structure of the present invention.

[0013] In the diagram: 1. Telescopic straight pipe; 2. Four-way connector; 3. Seal 1; 4. Seal 2; 5. Seal 3; 6. Seal 4; 7. Retaining ring; 8. Seal 5; 9. Connecting flange; 10. Snap ring; 11. Telescopic stud; 12. Nut; 101. Outer pipe; 102. Inner pipe; 103. Annular slider 1; 104. Annular slider 2; 105. Annular slider 3; 106. Telescopic cavity 1; 107. Telescopic cavity 2; 108. Telescopic cavity 3; 109. Screw; 110. Bolt; 111. Handle; 112. Annular disc. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0015] Example 1: like Figure 1 As shown, this embodiment relates to an expansion joint for large-diameter connections, including an expansion straight pipe 1 and a four-way connector 2.

[0016] like Figure 1 As shown, the telescopic straight tube 1 includes an outer tube 101 and an inner tube 102; one end of the inner tube 102 is connected to the four-way connector 2; the other end is sleeved inside the outer tube 101; as shown... Figure 2As shown, the outer wall of the inner tube 102 is provided with annular slider one 103 and annular slider two 104, and annular slider three 105 is provided on annular slider two 104; annular slider one 103 is parallel to the central axis of the telescopic straight tube 1 and is integrally connected to the outer wall of the inner tube 102 through annular disk 112, and annular slider three 105 is perpendicular to the central axis of the telescopic straight tube 1. Figure 1 As shown, the inner wall of the outer tube 101 is provided with telescopic cavities 106, 107, and 108, which respectively match the annular slider 103, 104, and 105. The telescopic cavity 106 has an L-shaped structure, and the annular slider 103 is in close contact with the inner wall of the telescopic cavity 106, making the inner tube 102 more stable. Both sides of the telescopic cavity 106, both sides of the telescopic cavity 107, and both sides of the telescopic cavity 108 are provided with seals, including seal 3, seal 4, seal 5, and seal 6. When adjusting the relative position between the inner tube 102 and the outer tube 101, seals 3, 4, 5, and 6 can always ensure the sealing between the inner tube 102 and the outer tube 101.

[0017] The annular slider 108 has a threaded hole, and a screw 109 is connected inside the threaded hole. Figure 1 As shown, one end of the screw 109 is fixed to the side wall of the telescopic cavity 108 and can rotate relative to the side wall of the telescopic cavity 108. The other end of the screw 109 passes through the end of the outer tube 101 and is connected to the handle 111. The inner tube 102 and the outer tube 101 are fixed together by bolts 110. The bolts 110 are located in the telescopic cavity 107. By rotating the screw 109, the annular slider 105 moves along the inner wall of the telescopic cavity 108 to adjust the position of the inner tube 102 relative to the outer tube 101. After the position is adjusted, the bolts 110 are sequentially inserted into the end of the outer tube 101, the telescopic cavity 107 and the annular slider 104 to further fix the outer tube 101 and the inner tube 102.

[0018] A blind hole is provided at the end of the annular slider 104, and the bolt 110 is threaded into the blind hole to fix the inner tube 102 and the outer tube 101. Alternatively, a connecting rod with external threads can be fixed to the end of the annular slider 104. After adjusting the position, the nut on the connecting rod is tightened to fix the inner tube 102 and the outer tube 101.

[0019] like Figure 1As shown, a retaining ring 7 and a sealing ring 8 are installed on the inner tube 102. The four-way connector 2 is installed on one side of the inner tube 102 through the sealing hole. The connecting flange 9 passes through the sealing end of the inner tube 102. The retaining ring 7 is installed on the inner tube 102 through the slot. A retaining spring 10 is provided on one side of the retaining ring 7 to block one side of the retaining ring 7. The inner tube 102 has a sealing ring 8, and the sealing ring 8 is installed in the sealing ring groove. The sealing end of the inner tube 102 with the sealing ring 8 is installed in the sealing hole of the four-way connector 2 and is connected to the four-way connector 2 through the telescopic stud 11. There are nuts 12 at both ends of the connecting flange 9. The nut 12 on the left side bears the force between the inner tube 102 and the four-way connector 2. The telescopic distance between the inner tube 102 and the four-way connector 2 can be adjusted by the two nuts 12. Together with the telescopic straight tube 1 with adjustable length, the length of the telescopic joint can be adjusted, which increases the flexibility of the telescopic joint length adjustment.

[0020] The snap ring 10 restricts the swaying between the docking flange 9 and the inner tube 102, and the docking flange 9 rotates 360° relative to the inner tube 102, so that there is no phase requirement for the bolt mounting holes between the four-way 2 and the inner tube 102.

[0021] During assembly, the screw 109 is rotated to move the annular slider 105 along the inner wall of the telescopic cavity 108, adjusting the position of the inner tube 102 relative to the outer tube 101. After adjustment, the outer tube 101 and inner tube 102 are further fixed with bolts 110, achieving a double-fixing effect. After assembling the inner tube 102 and outer tube 101, the four-way connector 2 is assembled. First, the nut 12 on the left side is adjusted to fit against the plane of the connecting flange 9, and then the nut 12 on the left side is tightened. The connecting flange 9 can rotate 360° relative to the telescopic straight pipe 1 and can move axially along the telescopic straight pipe 1, making it convenient to connect the telescopic joint at the wellhead position. In application, the four-way connector of the telescopic joint can be connected to the telescopic straight pipe of another telescopic joint. Multiple large-diameter telescopic joints can be connected together, enabling more degrees of freedom of adjustment.

Claims

1. A large-diameter expansion joint, comprising an expansion straight pipe and a four-way connector; characterized in that: The telescopic straight tube includes an outer tube and an inner tube; one end of the inner tube is connected to a four-way connector; the other end is fitted inside the outer tube; the outer wall of the inner tube is provided with annular slider one and annular slider two, and annular slider two is provided with annular slider three; the inner wall of the outer tube has telescopic cavities one, two, and three respectively matching annular slider one, annular slider two, and annular slider three; annular slider three has a threaded hole, and a screw is connected in the threaded hole. One end of the screw is fixed to the side wall of the three telescopic cavities and can rotate relative to the side wall of the three telescopic cavities. The other end of the screw passes through the end of the outer tube. The inner tube and the outer tube are fixed together by bolts, and the bolts are located in the two telescopic cavities; the one telescopic cavity is an L-shaped structure, and the one annular slider one is close to the inner wall of the one telescopic cavity; the one annular slider one is parallel to the central axis of the telescopic straight tube, and the one annular slider three is perpendicular to the central axis of the telescopic straight tube; the one annular slider one is connected to the outer wall of the inner tube by an annular disc; the one annular slider one, the annular disc, and the outer wall of the inner tube are integrally connected.

2. The expansion joint for large-diameter connections according to claim 1, characterized in that: The two sides of the first telescopic cavity, the two sides of the second telescopic cavity, and the two sides of the third telescopic cavity are all sealed.

3. The expansion joint for large-diameter connections according to claim 1, characterized in that: The annular slider has blind holes at both ends, and the bolt is threaded into the blind holes.

4. A large-diameter expansion joint according to any one of claims 1-3, characterized in that: The inner tube is equipped with a retaining ring and a sealing five. The four-way valve is installed on one side of the inner tube through the sealing hole. The connecting flange passes through the sealing end of the inner tube. The retaining ring is installed on the inner tube through a groove. The inner tube has a sealing five, which is installed in the sealing ring groove. The sealing end of the inner tube with the sealing five is installed in the sealing hole of the four-way valve and is connected to the four-way valve through a telescopic stud. Both ends of the connecting flange have nuts.

5. The expansion joint for large-diameter connections according to claim 4, characterized in that: A retaining ring is provided on one side of the retaining ring.

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