Bolt and its applicable pipe connector

Abstract

The utility model relates to pipeline connection, specifically relates to a bolt and its applicable pipeline connector, wherein the bolt includes screw rod, the middle part of screw rod is provided with the radial protrusion fixed with screw rod, and the periphery profile of radial protrusion is noncircular in the section perpendicular to screw rod axial direction, the center hole for screw rod to pass through on the compression ring connecting ear on pipeline connector is step hole, radial protrusion is located in the big aperture section of step hole, and the profile of big aperture section of step hole is consistent with the profile of radial protrusion. When carrying out pipeline connector and the fastening connection of pipeline to be connected, the radial protrusion on screw rod and step hole on compression ring connecting ear constitute the limit stop of limiting screw rod autorotation, and screw rod will not rotate along with the rotation of lock nut, realizes the effective fastening of lock nut. Simultaneously, the complicated screw assembly operation between the limit nut and screw rod in the middle part of screw rod in the prior art is cancelled, and it is favorable to the overall installation efficiency of pipeline connector.

Description

Technical Field

[0001] This utility model relates to pipe connections, specifically to a bolt and a suitable pipe connector thereof. Background Technology

[0002] Pipelines are typically connected during installation or maintenance. This connection is usually made using flanges. For pipelines without flanges at the connection end, flanges are usually welded. For pipelines that do not have the capability to weld flanges, flanges are added using pipe connectors or directly connected to pipe components such as tees, valves, and elbows.

[0003] The patent document entitled "Pipeline Anti-Disengagement Connector" (publication number CN216643394U) discloses a technical solution including a connecting sleeve and a pressure sleeve fitted onto the pipe to be connected. The connecting sleeve and the pressure sleeve form a connection that restricts their axial separation. A locking ring and an elastic sealing ring are fitted onto the pipe to be connected at the connection between the pressure sleeve and the connecting sleeve. When the pressure sleeve and the connecting sleeve move closer to each other, the locking ring and the elastic sealing ring form an axial compression fit and radial deformation. The end of the connecting sleeve away from the pressure sleeve is connected to a pipe connector or pipe component. A pressure ring is provided between the locking ring and the elastic sealing ring, fitted onto the pipe to be connected. The two ends of the pressure ring abut against the locking ring and the elastic sealing ring, respectively. The connecting sleeve and the pressure sleeve are connected by a screw, and the pressure ring is connected to the screw to form an axial limit. Locking nuts are provided on the opposite sides of the connecting sleeve and the pressure sleeve. In this solution, the tightening of the seal and the locking ring is divided into two tightening steps to avoid interference between the tightening actions of the two and affect the overall assembly. A limiting nut is fitted on the middle section of the screw, and the limiting nut is threadedly connected to the screw so as to tighten the pressure ring and the connecting sleeve.

[0004] In the above technical solution, the screw is essentially in a state where it can rotate freely. When the locking nut is turned, the screw easily rotates along with the front and rear locking nuts, resulting in ineffective tightening. In addition, the limiting nut needs to be tightened to the middle section of the screw so that a certain length of rod length is reserved at both ends of the screw to connect the pressure sleeve and the connecting sleeve. However, considering that the screw is generally long, the installation operation between the limiting nut and the screw is cumbersome and inconvenient, affecting the overall installation efficiency of the pipe connector. Summary of the Invention

[0005] This utility model provides a bolt and a suitable pipe connector thereof, which solves the problem that the bolt easily rotates with the rotation of the locking nut, causing the pipe connector to be ineffectively tightened, while improving the overall installation efficiency of the pipe connector.

[0006] To achieve the above objectives, the technical solution adopted is as follows: a bolt, including a screw, wherein a radial protrusion fixedly connected to the screw is provided in the middle of the screw, and the peripheral contour of the radial protrusion in the cross section perpendicular to the axial direction of the screw is non-circular.

[0007] A pipe connector includes a connecting sleeve, a pressure ring, and a pressure sleeve, which are sequentially fitted onto the end section of the pipe to be connected along the pipe length. A connecting flange at one end of the connecting sleeve is located at the end of the pipe to be connected. The other end of the connecting sleeve is a stepped hole, and one end of the pressure ring is located at the opening of the stepped hole. A sealing ring is placed in an annular cavity formed by the connecting sleeve, the outer wall of the pipe to be connected, and the end face of the pressure ring. A locking ring is provided in an annular cavity formed between the pressure sleeve, the outer wall of the pipe to be connected, and the end face of the pressure ring. When the pressure sleeve, the connecting sleeve, and the pressure ring move closer to each other, the locking ring and the sealing ring are axially compressed and radially deformed. A screw passes through the connecting sleeve connecting lug on the outer periphery of the connecting sleeve, the pressure ring connecting lug on the outer periphery of the pressure ring, and the pressure sleeve connecting lug on the outer periphery of the pressure sleeve. A locking nut is provided on the screw body on the opposite side of the connecting sleeve connecting lug and the pressure sleeve connecting lug. The central hole on the pressure ring connecting lug through which the screw passes is a stepped hole, and a radial protrusion is located in the large-diameter section of the stepped hole. The contour of the large-diameter section of the stepped hole matches the contour of the radial protrusion.

[0008] Compared with the prior art, the technical advantages of this utility model are as follows: A radial protrusion fixedly connected to the rod body is provided in the middle of the screw. The peripheral contour of the radial protrusion in the section perpendicular to the screw axis is non-circular. The large-diameter section of the stepped hole on the pressure ring connecting ear matches the peripheral contour of the radial protrusion. When the pipe connector is fastened to the pipe to be connected, the radial protrusion on the screw and the stepped hole on the pressure ring connecting ear form a limiting fit that restricts the screw's rotation. The screw will not rotate with the rotation of the locking nut, achieving effective tightening of the locking nut. Furthermore, no additional tools are needed to limit the screw's rotation during the tightening operation, making the tightening of the pipe connector more convenient. It also eliminates the cumbersome screwing and assembly operation between the limiting nut in the middle of the screw and the screw in the prior art, which helps improve the overall installation efficiency of the pipe connector. Attached Figure Description

[0009] Figure 1 This is a three-dimensional appearance diagram of the bolt of this utility model;

[0010] Figure 2 This is a schematic diagram of the pipe connector of this utility model;

[0011] Figure 3 This is a cross-sectional view of the pipe connector.

[0012] Figure 4 for Figure 3 A schematic diagram of a local structure. Detailed Implementation

[0013] The following is in conjunction with the appendix Figure 1-4 The present invention will be further described in detail below, including related content:

[0014] Example 1

[0015] A bolt includes a screw 10, with a radial protrusion 11 fixedly connected to the middle of the screw 10. The radial protrusion 11 has a non-circular periphery in a cross-section perpendicular to the axial direction of the screw 10. When designing a pipe connector, the contour of the anti-rotation countersunk hole of the pressure ring lug 31 on the pipe connector is designed to match the contour of the radial protrusion 11. Since the radial protrusion 11 is fixedly connected to the body of the screw 10, a limiting fit that restricts the rotation of the screw 10 can be formed on the pipe connector, preventing the screw 10 from rotating with the front and rear locking nuts 70 during tightening and thus avoiding ineffective tightening.

[0016] As a preferred embodiment, the radial protrusion 11 is a ring fitted onto the screw 10, and the inner ring of the radial protrusion 11 is fixedly connected to the wall of the screw 10. In this embodiment, the radial protrusion 11 is not formed integrally; it is a ring fitted onto the middle of the screw 10, and then the inner ring of the radial protrusion 11 is fixedly connected to the wall of the screw 10 (e.g., by welding) to form an integral structure.

[0017] In addition, the radial protrusion 11 can also be a stepped protrusion ring integrally formed with the screw 10, so that when machining the screw 10 itself, the radial protrusion 11 can be directly machined out on the screw 10.

[0018] As a preferred embodiment, the radial protrusion 11 is arranged coaxially with the screw 10.

[0019] As a preferred option, the outer periphery of the radial protrusion 11 is a regular hexagon, but it can also be a triangle, a square, an ellipse, etc.

[0020] Example 2

[0021] In addition to providing a bolt, this application also provides a pipe connector using the bolt in Embodiment 1, including a connecting sleeve 20, a pressure ring 30, and a pressure sleeve 40 sequentially fitted onto the end section of the pipe to be connected, along the pipe length direction. A connecting flange 21 at one end of the connecting sleeve 20 is located at the end of the pipe to be connected, and the other end of the connecting sleeve 20 has a stepped hole, with one end of the pressure ring 30 located at the opening of the stepped hole. A sealing ring 50 is placed within an annular cavity formed by the connecting sleeve 20, the outer wall of the pipe to be connected, and the end face of the pressure ring 30. A locking ring 60 is provided within an annular cavity formed between the pressure sleeve 40, the outer wall of the pipe to be connected, and the end face of the pressure ring 30. The pressure sleeve 40, the connecting sleeve 20, and the pressure ring 30 are connected... When they move closer together, the locking ring 60 and the sealing ring 50 are axially compressed and radially deformed. The screw 10 passes through the connecting sleeve connecting ear 22 on the outer periphery of the connecting sleeve 20, the pressure ring connecting ear 31 on the outer periphery of the pressure ring 30, and the pressure sleeve connecting ear 41 on the outer periphery of the pressure sleeve 40. A locking nut 70 is provided on the screw 10 body on the opposite side of the connecting sleeve connecting ear 22 and the pressure sleeve connecting ear 41. The central hole on the pressure ring connecting ear 31 through which the screw 10 passes is a stepped hole 311. The feature is that the radial protrusion 11 is located in the large diameter section of the stepped hole 311. The hole wall contour of the large diameter section of the stepped hole 311 in the section perpendicular to the axial direction of the screw 10 matches the peripheral contour of the radial protrusion 11.

[0022] In the above technical solution, a radial protrusion 11 fixedly connected to the rod body is provided in the middle of the screw 10. The peripheral contour of the radial protrusion 11 in the cross section perpendicular to the axial direction of the screw 10 is non-circular. The large-diameter section of the stepped hole 311 on the pressure ring connecting ear 31 matches the peripheral contour of the radial protrusion 11. When the pipe connector is fastened to the pipe A to be connected, the radial protrusion 11 on the screw 10 and the stepped hole 311 on the pressure ring connecting ear 31 form a limiting fit to restrict the rotation of the screw 10. The screw 10 will not rotate with the rotation of the locking nut 70, thus achieving effective fastening of the locking nut 70. During the fastening operation, no additional tools (wrench or pliers) are needed to limit the rotation of the screw 10, making the fastening operation of the pipe connector more convenient. At the same time, the cumbersome screwing and assembly operation between the limiting nut in the middle of the screw 10 and the screw 10 in the prior art is eliminated, which helps to improve the overall installation efficiency of the pipe connector.

[0023] The large-diameter end of the stepped hole 311 faces the side where the connecting sleeve 20 or the pressure sleeve 40 is located. When the large-diameter end of the stepped hole 311 faces the side where the connecting sleeve 20 is located, the radial protrusion 11 is located on the side of the pressure ring connecting ear 31 away from the pressure sleeve connecting ear 41. The radial protrusion 11 and the locking nut 70 on the pressure sleeve connecting ear 41 form a limiting fit that restricts the pressure ring 30 and the pressure sleeve 40 from moving away from each other, thereby ensuring the locking reliability of the locking ring 60. When the large-diameter end of the stepped hole 311 faces the side where the pressure sleeve 40 is located, the radial protrusion 11 is located on the side of the pressure ring connecting ear 31 away from the connecting sleeve connecting ear 22. The radial protrusion 11 and the locking nut 70 on the connecting sleeve connecting ear 22 form a limiting fit that restricts the pressure ring 30 and the connecting sleeve 20 from moving away from each other, thereby preventing the sealing ring 50 from rebounding and affecting the sealing performance. Of course, regardless of which side the large diameter end of the stepped hole 311 faces, under the tightening action of the two locking nuts 70, the locking ring 60, the sealing ring 50 and the pressure ring 30 are axially squeezed, so that the locking ring 60 is tightened and the sealing ring 50 is stretched, which can ensure a reliable connection and seal between the pipe connector and the pipe A to be connected.

[0024] As a preferred embodiment, the locking ring 60 is a metal, open-ended C-shaped ring with an anti-slip textured inner wall and a conical outer wall. The inner wall of the pressure sleeve 40 is a conical hole wall that mates with the outer wall of the locking ring 60. When the pressure sleeve 40 and the pressure ring 30 move closer together axially, they create axial compression on the locking ring 60. The pressure sleeve 40 forces the locking ring 60, composed of the open-ended C-shaped ring, to tighten onto the outer wall of the pipe A to be connected, thereby limiting the axial displacement of the entire pipe connector on the pipe A to be connected, achieving the purpose of locking.

[0025] As a preferred embodiment, the end of the connecting sleeve 20 furthest from the connecting flange 21 is a tapered hole, and one end of the pressure ring 30 is located at the large-diameter orifice of the tapered hole. The large-diameter end of the tapered hole of the connecting sleeve 20 is connected to a straight hole section, and the outer end orifice of the straight hole section surrounds the outer circumferential surface of the adjacent end of the pressure ring 30. In this embodiment, when the pressure ring 30 and the connecting sleeve 20 approach each other axially, the end face of the pressure ring 30 and the inner wall of the tapered hole form an axial compression on the sealing ring 50. At the same time, the radial constraint of the straight hole section is used to compress the sealing ring 50, causing it to deform radially and seal against the outer wall of the pipe A to be connected and the inner wall of the tapered hole of the connecting sleeve 20, thereby achieving a sealed connection between the connecting sleeve 20 and the pipe A to be connected.

Claims

1. A bolt comprising a shank (10), characterized in that: The screw (10) has a radial protrusion (11) fixedly connected to the screw (10) in the middle. The radial protrusion (11) has a non-circular periphery in the cross section perpendicular to the axial direction of the screw (10).

2. The bolt of claim 1, wherein: The radial protrusion (11) is a ring fitted on the screw (10), and the inner ring of the radial protrusion (11) is fixedly connected to the wall of the screw (10).

3. The bolt of claim 1, wherein: The radial protrusion (11) is a stepped protrusion formed integrally with the screw (10).

4. A bolt according to claim 2 or 3, characterised in that: The radial protrusion (11) is arranged coaxially with the screw (10).

5. The bolt according to claim 4, characterized in that: The outer periphery of the radial protrusion (11) is a regular hexagon.

6. A pipe connector using the bolts described in claim 1, 2, 3, or 5, comprising a connecting sleeve (20), a pressure ring (30), and a pressure sleeve (40) sequentially fitted onto the end section of the pipe to be connected (A) along the pipe length direction. A connecting flange (21) at one end of the connecting sleeve (20) is located at the end of the pipe to be connected (A). A sealing ring (50) is placed within an annular cavity formed by the connecting sleeve (20), the outer wall of the pipe to be connected (A), and the end face of the pressure ring (30). A locking ring (60) is provided within an annular cavity formed between the pressure sleeve (40), the outer wall of the pipe to be connected (A), and the end face of the pressure ring (30). When the connecting sleeve (20) and the pressure ring (30) move closer to each other, the locking ring (60) and the sealing ring (50) are axially compressed and radially deformed. The screw (10) passes through the connecting sleeve connecting ear (22) on the outer periphery of the connecting sleeve (20), the pressure ring connecting ear (31) on the outer periphery of the pressure ring (30), and the pressure sleeve connecting ear (41) on the outer periphery of the pressure sleeve (40). A locking nut (70) is provided on the screw (10) on the opposite side of the connecting sleeve connecting ear (22) and the pressure sleeve connecting ear (41). The central hole on the pressure ring connecting ear (31) through which the screw (10) passes is a stepped hole (311). The characteristic is that: The radial protrusion (11) is located within the large diameter section of the stepped hole (311), and the hole wall profile of the large diameter section of the stepped hole (311) in the section perpendicular to the axial direction of the screw (10) matches the peripheral profile of the radial protrusion (11).

7. The pipe coupling according to claim 6, wherein: The large-diameter end of the stepped hole (311) faces the side where the connecting sleeve (20) or the pressure sleeve (40) is located.

8. The pipe coupling according to Claim 6, wherein: The locking ring (60) is a metal open-shaped C-ring with anti-slip mesh on the inner ring wall and a conical outer ring wall. The inner wall of the pressure sleeve (40) is a conical hole wall that matches the outer ring wall of the locking ring (60).

9. The pipe coupling according to Claim 6, wherein: The end of the connecting sleeve (20) away from the connecting flange (21) is a tapered hole and the end of the pressure ring (30) is located at the large diameter orifice of the tapered hole. The large diameter end of the tapered hole of the connecting sleeve (20) is connected to a straight hole section, and the outer end orifice of the straight hole section surrounds the outer circumferential surface of the pressure ring (30) near the end.

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