A trench elbow

Abstract

The application discloses a trench elbow joint, which comprises an elbow joint, a connecting pipeline and a fixing hoop assembly; the fixing hoop assembly is composed of two arc-shaped valve members, the inner side of the arc-shaped valve members is fixedly provided with a flexible sealing ring, and the inside of the flexible sealing ring is further provided with an expansion cavity; an auxiliary sealing assembly is further fixedly connected between the two arc-shaped valve members, and the auxiliary sealing assembly is used for automatically expanding and compensating the gap of the flexible sealing ring when the arc-shaped valve members are in a loose separation state; through the cooperation of the fixing hoop assembly and the auxiliary sealing assembly, the sealing compensation can be automatically performed when the fixing hoop assembly is loosened due to vibration and the like but has not yet completely failed, the flexible sealing ring is expanded, the gap generated due to loosening is filled, and thus the further leakage can be effectively prevented.

Description

Technical Field

[0001] This application relates to the field of pipe bend fitting technology, and in particular to a grooved pipe bend fitting. Background Technology

[0002] Grooved pipe bends are a common type of pipe fitting. Due to their advantages of convenient installation and high reliability, they are widely used in fire water supply, oil and gas transportation, chemical fluid transmission and other industrial pipeline systems. These joints typically consist of a bend body, a connecting pipe and a fixing clamp assembly for fastening.

[0003] In practical applications, especially in complex situations such as long-term mechanical vibration, thermal expansion and contraction caused by periodic temperature changes, or internal stress fluctuations in pipelines, the initial preload of the fixing bolts will inevitably decrease under long-term alternating loads. This will lead to slight loosening and separation between the two arc-shaped valve components. Although this loosening has not yet caused the joint to fail completely, it will reduce the clamping force of the arc-shaped valve component on the inner flexible sealing ring, creating a tiny gap at the sealing interface, and ultimately causing media leakage.

[0004] In other words, existing technologies have the following technical problems: ordinary pipe bends are prone to loosening and leakage under long-term vibration. Therefore, a grooved pipe bend is proposed to address the above problems. Utility Model Content

[0005] This embodiment provides a grooved bend joint to solve the problem that ordinary bend joints in the prior art are prone to loosening and leakage under long-term vibration.

[0006] According to one aspect of this application, a grooved pipe bend fitting is provided, including a pipe bend fitting, a connecting pipe, and a fixing clamp assembly; The fixing clamp assembly consists of two arc-shaped valve components. A flexible sealing ring is fixedly provided on the inner side of the arc-shaped valve components, and an expansion cavity is also provided inside the flexible sealing ring. An auxiliary sealing assembly is also fixedly connected between the two arc-shaped valve components. The auxiliary sealing assembly is used to automatically expand the flexible sealing ring to compensate for the gap when the arc-shaped valve components are in a loose and separated state.

[0007] Furthermore, the inner side of the arc-shaped valve component is provided with a groove for accommodating a flexible sealing ring.

[0008] Furthermore, protrusions extend from both ends of the arc-shaped valve component to form fixing ear plates, and mounting holes are provided on the fixing ear plates, with fixing bolts installed in the mounting holes of the fixing ear plates.

[0009] Furthermore, the flexible sealing ring is made of a corrosion-resistant and highly elastic polymer material.

[0010] Furthermore, the auxiliary sealing assembly includes a fixed cylinder, a movable piston, and a movable guide rod. The fixed cylinder is fixedly disposed at the side wall position of one of the fixed ear plates. One end of a connecting tube is also fixedly connected to the inner cavity of the fixed cylinder, and the other end of the connecting tube extends into the expansion cavity and is fixedly connected to the flexible sealing ring.

[0011] Furthermore, a movable piston is slidably connected in the inner cavity of the fixed cylinder, and one end of a pressure rod is fixedly connected to one side of the movable piston. The other end of the pressure rod penetrates the inner wall of the fixed cylinder and extends to the outside of the wall. The pressure rod is used to push the movable piston to move in the inner cavity of the fixed cylinder.

[0012] Furthermore, a piston sealing ring is fitted around the outer edge of the movable piston.

[0013] Furthermore, the movable guide rod passes through the two arc-shaped valve components and slides with them. One end of the movable guide rod is fixedly connected to one end of a connecting plate, and the other end of the connecting plate is fixedly connected to one end of a pressure rod.

[0014] Furthermore, a threaded groove is provided at the other end of the movable guide rod, and the movable guide rod is threadedly connected to a limit sleeve through the threaded groove.

[0015] Furthermore, a support spring is sleeved on the outside of the movable guide rod. One end of the support spring is fixedly connected to the connecting plate, and the other end of the support spring is in contact with the arc-shaped valve component. The support spring is in a pre-compressed state.

[0016] In order to solve the technical problem in the prior art where ordinary grooved pipe joints, during use, suffer from a decrease in the preload of the fixing bolts due to long-term vibration, thermal expansion and contraction, or changes in pipe stress, causing the two arc-shaped valve components to loosen and separate, leading to leakage, this application designs a pipe joint structure with auxiliary sealing function. Through the combined use of the fixing clamp assembly and the auxiliary sealing assembly, automatic sealing compensation can be performed even if the fixing clamp assembly loosens due to vibration or other reasons but has not completely failed. This causes the flexible sealing ring to expand and fill the gap caused by loosening, thereby effectively preventing further leakage and providing a certain buffer time. This improves the safety and reliability of the pipe joint, making it particularly suitable for use in fire protection, oil and gas transportation, chemical and other working conditions with high requirements for sealing safety and significant vibration risks. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of one embodiment of this application; Figure 2 This is a front view structural diagram of one embodiment of this application; Figure 3 This is a side view of one embodiment of the present application. Figure 4 This is a three-dimensional structural diagram of a bend pipe joint according to an embodiment of this application; Figure 5 This is a cross-sectional structural diagram of a bend joint according to an embodiment of this application; Figure 6 This is a schematic diagram of the structure of an auxiliary sealing assembly according to an embodiment of this application; Figure 7 This is a schematic diagram of the structure of a flexible sealing ring according to an embodiment of this application.

[0019] In the diagram: 1. Bend joint; 2. Connecting pipe; 3. Fixing clamp assembly; 301. Arc-shaped valve component; 302. Fixing ear plate; 303. Fixing bolt; 304. Groove; 4. Auxiliary sealing assembly; 401. Fixing cylinder; 402. Moving piston; 403. Pressure rod; 404. Connecting plate; 405. Moving guide rod; 4051. Threaded groove; 406. Limiting sleeve; 4061. Locking bolt; 407. Support spring; 408. Connecting pipe; 5. Flexible sealing ring; 501. Expansion cavity. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0021] Please see Figure 1 and Figure 2 As shown, a grooved pipe bend joint includes a pipe bend joint 1, a connecting pipe 2, and a fixing clamp assembly 3; The fixing clamp assembly 3 is composed of two arc-shaped valve components 301. A flexible sealing ring 5 is fixedly provided on the inner side of the arc-shaped valve component 301. An expansion cavity 501 is also provided inside the flexible sealing ring 5. An auxiliary sealing component 4 is also fixedly connected between the two arc-shaped valve components 301. The auxiliary sealing component 4 is used to automatically cause the flexible sealing ring 5 to expand and compensate for the gap when the arc-shaped valve components 301 are in a loose and separated state.

[0022] To address the technical problem in existing grooved pipe joints where long-term vibration, thermal expansion and contraction, or changes in pipe stress lead to a decrease in the preload of the fixing bolts, causing the two arc-shaped valve components to loosen and separate, resulting in leakage, this application designs a pipe joint structure with auxiliary sealing function. Through the coordinated use of the fixing clamp assembly 3 and the auxiliary sealing assembly 4, automatic sealing compensation can be performed even if the fixing clamp assembly 3 loosens due to vibration or other reasons but has not completely failed. This causes the flexible sealing ring 5 to expand and fill the gap caused by loosening, effectively preventing further leakage and providing a buffer time. This improves the safety and reliability of the pipe joint, making it particularly suitable for applications in fire protection, oil and gas transportation, chemical industries, and other situations requiring high sealing safety and facing significant vibration risks.

[0023] As a further technical solution, see Figure 4 and Figure 5 As shown, the inner side of the arc-shaped valve component 301 is provided with a groove 304 for accommodating the flexible sealing ring 5. With this technical solution, when the elbow joint 1 is installed with the connecting pipe 2, the flexible sealing ring 5 is first securely placed in the groove 304, and then the two arc-shaped valve components 301 are wrapped around the ends of the assembled elbow joint 1 and connecting pipe 2. The groove 304's limiting effect on the flexible sealing ring 5 prevents it from shifting or twisting during installation and under pressure, ensuring the uniformity and reliability of the initial seal.

[0024] As a preferred technical solution, please refer to Figure 3 and Figure 4 As shown, protrusions extend from both ends of the arc-shaped valve component 301 to form fixing ear plates 302. The fixing ear plates 302 are provided with mounting holes, and fixing bolts 303 are provided in the mounting holes of the fixing ear plates 302. With this technical solution, when performing final tightening, by tightening the fixing bolts 303, the two fixing ear plates 302 are brought closer to each other, thereby driving the two arc-shaped valve components 301 to tightly hug the pipe, realizing a firm lock on the pipe joint.

[0025] As a specific technical solution, to ensure a durable seal, the flexible sealing ring 5 is made of a corrosion-resistant, highly elastic polymer material, preferably nitrile rubber (NBR) or hydrogenated nitrile rubber (HNBR). By selecting the above materials, it can be ensured that the sealing ring maintains its elasticity and sealing performance over a long period of time under complex media and temperature environments.

[0026] For specific technical solutions, please refer to Figure 6 and Figure 7 As shown, the auxiliary sealing assembly 4 includes a fixed cylinder 401, a movable piston 402, and a movable guide rod 405. The fixed cylinder 401 is fixedly disposed on the side wall of one of the fixed lugs 302. One end of a connecting pipe 408 is also fixedly connected to the inner cavity of the fixed cylinder 401. The other end of the connecting pipe 408 extends into the expansion cavity 501 and is fixedly connected to the flexible sealing ring 5. Through this technical solution, the piston cavity of the fixed cylinder 401 and the expansion cavity 501 of the flexible sealing ring 5 form a connected sealed pressure chamber through the connecting pipe 408, thereby converting the linear motion of the piston into pressure and directly transmitting it to the interior of the flexible sealing ring 5, driving it to deform.

[0027] As a further technical solution, see Figure 6 As shown, a movable piston 402 is slidably connected in the inner cavity of the fixed cylinder 401. One end of a pressure rod 403 is fixedly connected to one side of the movable piston 402. The other end of the pressure rod 403 penetrates the inner wall of the fixed cylinder 401 and extends to the outside of the wall. The pressure rod 403 is used to push the movable piston 402 to move in the inner cavity of the fixed cylinder 401, thereby changing the volume of the inner cavity of the fixed cylinder 401, and thus driving the medium in the cavity to generate pressure.

[0028] As a preferred technical solution, to ensure the sealing between the movable piston 402 and the fixed cylinder 401, a piston sealing ring is fitted around the outer edge of the movable piston 402. This technical solution effectively prevents the medium inside the piston chamber from leaking through the gap between the piston and the cylinder wall, ensuring the reliability of pressure build-up.

[0029] As a further technical solution, see Figure 6 As shown, the movable guide rod 405 passes through two arc-shaped valve components 301 and slides between them. One end of the movable guide rod 405 is fixedly connected to one end of the connecting plate 404, and the other end of the connecting plate 404 is fixedly connected to one end of the pressure rod 403.

[0030] To limit the position of the movable guide rod 405, a threaded groove 4051 is provided at the other end of the movable guide rod 405. The movable guide rod 405 is threadedly connected to a limiting sleeve 406 through the threaded groove 4051. By rotating the limiting sleeve 406, it can be moved axially along the movable guide rod 405, thereby adjusting the initial position of the movable guide rod 405 and its position relative to the arc-shaped valve component 301, and thus triggering fine-tuning of the sealing compensation action. The limiting sleeve 406 is also provided with a threaded hole, and a locking bolt 4061 is threadedly connected to the threaded hole of the limiting sleeve 406. With this technical solution, after the position of the limiting sleeve 406 is adjusted, tightening the locking bolt 4061 will cause its end to press against the threaded groove 4051 or the rod body of the movable guide rod 405, effectively preventing the limiting sleeve 406 from rotating on its own and changing its position under vibration, thus ensuring the stability of use.

[0031] When the fixing clamp assembly 3 loosens, the gap between the two fixing lugs 302 increases. This change in gap drives the moving guide rod 405 to move, which in turn pushes the pressure rod 403 and the moving piston 402 into the fixed cylinder 401. The movement of the piston compresses the transmission medium in the chamber, causing the pressure to act on the inner wall of the expansion cavity 501 through the connecting pipe 408, forcing the flexible sealing ring 5 to expand outward as a whole, tightly fitting the gap caused by the loosening of the pipeline, and achieving automatic compensation sealing.

[0032] As a preferred technical solution, a support spring 407 is sleeved on the outside of the moving guide rod 405. One end of the support spring 407 is fixedly connected to the connecting plate 404, and the other end of the support spring 407 contacts the arc-shaped valve component 301. The support spring 407 is in a pre-compressed state. Through this technical solution, the pre-compression force of the support spring 407 will continuously exert a tendency to push the moving piston 402 into the fixed cylinder 401. When the initial installation is completed, this tendency is balanced by the reverse constraint force generated by the two tightly closed fixed ear plates 302 on the pressure rod 403 through the moving guide rod 405, so that the entire structure is in a static pre-tightened state.

[0033] To ensure that the flexible sealing ring 5 can produce a sufficiently effective compensating seal when a small gap occurs in the fixed ear plate 302; The cross-sectional area of ​​the movable piston 402 is designed to be much smaller than the effective pressure-bearing area of ​​the annular expansion cavity 501 inside the flexible sealing ring 5. For example, the area ratio is set to 1:5. In this way, the 0.5mm separation gap of the fixed ear plate can be converted into a radial expansion tendency of 2.5mm for the sealing ring, which is sufficient to compensate for the actual gap.

[0034] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A grooved pipe bend joint, comprising a pipe bend joint (1), a connecting pipe (2), and a fixing clamp assembly (3); characterized in that: The fixing hoop assembly (3) is composed of two arc-shaped valve components (301). A flexible sealing ring (5) is fixedly provided on the inner side of the arc-shaped valve component (301). An expansion cavity (501) is also provided inside the flexible sealing ring (5). An auxiliary sealing assembly (4) is also fixedly connected between the two arc-shaped valve components (301). The auxiliary sealing assembly (4) is used to automatically cause the flexible sealing ring (5) to expand and compensate for the gap when the arc-shaped valve components (301) are in a loose and separated state.

2. The grooved bend joint according to claim 1, characterized in that: The inner side of the arc-shaped valve component (301) is provided with a groove (304) for accommodating the flexible sealing ring (5).

3. The grooved bend joint according to claim 1, characterized in that: Both ends of the arc-shaped valve component (301) extend protrusions to form a fixing ear plate (302). The fixing ear plate (302) is provided with mounting holes, and fixing bolts (303) are provided in the mounting holes of the fixing ear plate (302).

4. The grooved bend joint according to claim 1, characterized in that: The flexible sealing ring (5) is made of a corrosion-resistant and highly elastic polymer material.

5. The grooved bend joint according to claim 1, characterized in that: The auxiliary sealing assembly (4) includes a fixed cylinder (401), a movable piston (402), and a movable guide rod (405). The fixed cylinder (401) is fixedly disposed at the side wall position of one of the fixed ear plates (302). One end of a connecting pipe (408) is also fixedly connected to the inner cavity of the fixed cylinder (401). The other end of the connecting pipe (408) extends into the expansion cavity (501) and is fixedly connected to the flexible sealing ring (5).

6. The grooved bend joint according to claim 5, characterized in that: A movable piston (402) is slidably connected in the inner cavity of the fixed cylinder (401). One end of a pressure rod (403) is fixedly connected to one side of the movable piston (402). The other end of the pressure rod (403) penetrates the inner wall of the fixed cylinder (401) and extends to the outside of the wall. The pressure rod (403) is used to push the movable piston (402) to move in the inner cavity of the fixed cylinder (401).

7. The grooved bend joint according to claim 5, characterized in that: The outer edge of the movable piston (402) is fitted with a piston sealing ring.

8. The grooved bend joint according to claim 6, characterized in that: The movable guide rod (405) passes through two arc-shaped valve components (301) and slides with the arc-shaped valve components (301). One end of the movable guide rod (405) is fixedly connected to one end of the connecting plate (404), and the other end of the connecting plate (404) is fixedly connected to one end of the pressure rod (403).

9. The grooved bend joint according to claim 8, characterized in that: The other end of the movable guide rod (405) is also provided with a threaded groove (4051), and the movable guide rod (405) is threadedly connected to the limiting sleeve (406) through the threaded groove (4051).

10. The grooved bend joint according to claim 8, characterized in that: The movable guide rod (405) is fitted with a support spring (407). One end of the support spring (407) is fixedly connected to the connecting plate (404), and the other end of the support spring (407) is in contact with the arc-shaped valve component (301). The support spring (407) is in a pre-compressed state.

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