Small-diameter pipe leaking stoppage device

Abstract

The invention relates to the technical field of leaking stoppage, and particularly discloses a small-diameter pipe leaking stoppage device which comprises a hoop element, a first connecting piece and a second connecting piece. The auxiliary elements are located on the two sides of the hoop element, and the hoop element is opened, closed and fixed through the auxiliary elements; the sealing element is located on the contact face of the clamping element and the pipeline, and the sealing element is used for being in sealing fit with the outer wall of the pipeline. By means of well-designed sealing elements such as the rubber pad, the flexible graphite filler and the structure with the metal net interlayer, all the parts are matched with one another, the rubber pad can achieve preliminary sealing during installation, the flexible graphite filler can provide a long-acting and reliable sealing effect after being filled, the metal net interlayer guarantees the stability of the filler, and the service life of the filler is prolonged. The problem that sealing is not reliable in an existing pressure leaking stoppage technology is effectively solved, leakage of media in a pipeline can be reliably prevented, and gas or liquid or gas-liquid two-phase media can be well sealed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plugging, in particular to a small-diameter pipe plugging device. BACKGROUND

[0002] In key industrial fields such as thermal power generation, petroleum chemical industry, metallurgy, high-temperature and high-pressure small-diameter pipelines are widely used in superheater tubes, reheater tubes and various process pipelines as the core carrier for medium transportation. Such pipelines are subjected to high temperature and high pressure for a long time, and need to withstand the erosion and corrosion of complex fluids such as steam, oil and gas, and chemical media. Leakage accidents occur frequently, which has become a key hidden danger restricting the continuous and stable operation of industrial systems.

[0003] The current industry's traditional treatment method for high-temperature and high-pressure small-diameter pipe leakage generally relies on the process of "stopping and depressurizing, disassembling the pipeline, and replacing or repairing". This mode has significant technical defects: on the one hand, stopping operation will directly cause production interruption. For example, in a thermal power plant, the economic loss of a single unit stopping for one day may reach several million yuan; on the other hand, stopping operation is easy to cause secondary risks, such as damage to the boiler in the power plant due to dry burning, and triggering of chain reactions in chemical plants due to medium interruption, further expanding the accident influence range. In addition, in some emergency scenarios, the system cannot meet the stopping condition, and the traditional method is completely not applicable, and a plugging solution that can be "operated under pressure" is urgently needed.

[0004] In order to solve the above problems, some attempts have been made in the industry to plug under pressure, mainly including filler sealing, welding fixture, and ordinary clamp sealing, but all have obvious limitations: Most of them use single flexible filler to fill the leakage gap, which is easy to be washed out by the medium under high temperature and high pressure, and the sealing pressure is insufficient. Moreover, it cannot simultaneously meet the dual sealing requirements of the radial gap between the pipeline and the sealing element and the combination surface of the sealing element itself, and the leakage rate is difficult to control, usually cannot meet the requirements of industrial sealing standards.

[0005] The fixture and the pipeline need to be welded and fixed on site, which has a long operation period, and the high-temperature welding process may cause damage to the original pipeline material, increasing the risk of subsequent cracking of the pipeline. At the same time, it is not suitable for stainless steel, alloy and other difficult-to-weld materials, and the application scenarios are limited.

[0006] The smooth inner wall is attached to the pipeline, and the sealing is realized by relying on the pre-tightening force of the bolts. On the one hand, the sealing contact area is small and the pressure distribution is uneven, which is easy to cause sealing failure due to local stress concentration; on the other hand, there is no axial positioning structure, and the clamp and the pipeline are easy to slide relative to each other under high pressure, and cannot adapt to the deformation caused by thermal expansion and contraction of the pipeline, and the sealing stability is poor. Especially in gas-liquid two-phase medium working conditions, gas is easy to accumulate in the sealing chamber, further damaging the sealing effect. SUMMARY

[0007] Therefore, the technical problem to be solved by the present application is that the traditional shutdown plugging method leads to production interruption, large economic loss and secondary risk, and the existing plugging technology under pressure has the problems of unreliable sealing, long operation period, poor material adaptability, inability to cope with gas-liquid two-phase medium, and high operation cost due to non-reusable components.

[0008] The above technical problems are solved by the following technical solutions: the present application provides a small-diameter pipe plugging device, which comprises a clamp element; An auxiliary element is arranged on both sides of the clamp element, and the clamp element is opened, closed and fixed through the auxiliary element; and A sealing element is arranged on the contact surface of the clamp element and the pipeline, and the sealing element is used to form a sealing fit with the outer wall of the pipeline.

[0009] In a preferred mode of the small-diameter pipe plugging device, the clamp element comprises a first clamp and a second clamp, the diameters of the two ends of the first clamp and the second clamp are smaller than the middle diameter, and the middle parts of the first clamp and the second clamp are arranged in a semicircular shape, and the two sides are arranged with an overflow plate.

[0010] In a preferred mode of the small-diameter pipe plugging device, the auxiliary element comprises a sealing bolt arranged at the top end of the overflow plate, and the bottom end of the sealing bolt extends to the outside through the first clamp and the second clamp and is connected with a nut.

[0011] In a preferred mode of the small-diameter pipe plugging device, the sealing bolt is uniformly arranged along the length direction of the first clamp and the second clamp.

[0012] In a preferred mode of the small-diameter pipe plugging device, the sealing element comprises a filling groove arranged at the two ends of the first clamp and the second clamp, and rubber pads are arranged on both sides of the filling groove.

[0013] In a preferred mode of the small-diameter pipe plugging device, a metal mesh interlayer is arranged between the two rubber pads and the contact surface with the filling groove, and the filler in the filling groove is a flexible graphite filler.

[0014] In a preferred mode of the small-diameter pipe plugging device, a memory metal is arranged in the metal mesh interlayer, and the memory metal is arranged in an arc shape to support the metal mesh interlayer.

[0015] In a preferred mode of the small-diameter pipe plugging device, a filling port is arranged at the two ends of the first clamp and the second clamp, and a pressure rod is arranged in the filling port to seal the filling groove.

[0016] In a preferred mode of the small-diameter pipe plugging device: the pressure bar is fixed at the end of the first and second clamps by fastening bolts, which are vertically arranged between the first and second clamps.

[0017] In a preferred mode of the small-diameter pipe plugging device: the middle part of the first clamp is provided with an exhaust pipe controlled by a first valve, and the middle part of the second clamp is provided with a drainage pipe controlled by a second valve.

[0018] The small-diameter pipe plugging device of the present application adopts a pressure plugging mode, which does not need to interrupt production like traditional shutdown plugging, can effectively plug the leakage under normal operation of the pipeline, avoids production stagnation caused by shutdown, maximally reduces economic losses caused thereby, guarantees the continuity of production activities, and maintains stable production operation of the enterprise.

[0019] Through the carefully designed sealing elements such as rubber pads, flexible graphite fillers, and structures with metal mesh interlayers, the rubber pads can achieve preliminary sealing during installation, the flexible graphite fillers can provide long-term and reliable sealing effect after filling, and the metal mesh interlayer guarantees the stability of the filler, effectively solving the problem of unreliable sealing in existing pressure plugging technology, and reliably preventing leakage of the medium in the pipeline, whether it is gas or liquid, or gas-liquid two-phase medium.

[0020] The structure design is reasonable, the clamp element can conveniently realize opening and closing and fixing through the auxiliary element, and the exhaust pipe and the drainage pipe cooperate with the corresponding valves to quickly perform pressure relief operation, which is convenient for subsequent welding and other plugging processes. Compared with the long operation cycle of the existing pressure plugging technology, the device can significantly shorten the overall plugging operation time, improve work efficiency, and make the leakage problem be solved in time.

[0021] The sealing elements are selected from various materials such as rubber pads and flexible graphite fillers, which can be flexibly adapted to the corresponding sealing materials according to the medium transported by different pipelines, overcoming the defect of poor material adaptability in the prior art, and ensuring good plugging and sealing effect under various working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present application, but not limit the present application. Among them: Figure 1 The overall structure schematic diagram of the small-diameter pipe plugging device is shown; Figure 2Split structure schematic diagram of small-diameter pipe plugging device is shown; Figure 3 Split structure bottom view of small-diameter pipe plugging device is shown; Figure 4 Memory metal structure schematic diagram of small-diameter pipe plugging device is shown; Figure 5 Filling port structure schematic diagram of small-diameter pipe plugging device is shown. DETAILED DESCRIPTION

[0023] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below in conjunction with specific embodiments and drawings.

[0024] The terms used in the present application are those general terms currently widely used in the art in consideration of the functions about the present application, but these terms can be changed according to the intention of those skilled in the art, precedents, or new technology in the art. In addition, specific terms can be selected by the applicant, and in this case, the detailed meaning thereof will be described in the detailed description of the present application. Therefore, the terms used in the specification should not be understood as simple names, but based on the meaning of the terms and the overall description of the present application.

[0025] REFERENCE Figure 1 The present embodiment provides a small-diameter pipe plugging device, which is designed to solve the leakage problem of small-diameter pipelines during operation, has a compact overall structure and is convenient to operate, and can quickly realize plugging treatment of the leakage point.

[0026] The clamp element 1 is used as the main frame of the device, and is used to wrap the leaking pipeline and form the main structural support.

[0027] The auxiliary element 2 is located on both sides of the clamp element 1, and the clamp element 1 is opened and closed and fixed through the auxiliary element 2. The clamp element 1 can be tightly fitted to the outer wall of the pipeline through the adjustment of the auxiliary element 2, so as to ensure the stability of the whole device, and The sealing element 3 is located at the contact surface of the clamp element 1 and the pipeline, and is used to form a sealing fit with the outer wall of the pipeline. The sealing element 3 is located at the contact surface of the clamp element 1 and the pipeline, and is used to form a sealing fit with the outer wall of the pipeline, so as to prevent the medium in the pipeline from continuing to leak.

[0028] REFERENCE Figures 1-2As an optional embodiment, the clamp element 1 comprises a first clamp 11 and a second clamp 12, both of which have a smaller diameter at both ends than in the middle, wherein the middle part of the first clamp 11 and the second clamp 12 is arranged in a semicircular shape, and the two sides are provided with an overflow plate 13. The clamp element 1 comprises a first clamp 11 and a second clamp 12, both of which have a smaller diameter at both ends than in the middle, which can effectively cover the leakage area in the middle of the pipeline while enhancing the adhesion of both ends to the pipeline and improving the overall sealing performance. The middle part of the first clamp 11 and the second clamp 12 is arranged in a semicircular shape, and the arc of the semicircle is matched with the outer arc of the small-diameter pipe to be plugged, so as to better wrap the pipeline. The two sides are provided with an overflow plate 13, which provides a bearing base for the installation of auxiliary elements, so that the auxiliary elements can be stably connected to the first clamp 11 and the second clamp 12.

[0029] The middle part of the first clamp 11 is provided with an exhaust pipe 14 controlled by a first valve 15, and the middle part of the second clamp 12 is provided with a drain pipe 16 controlled by a second valve 17. The middle part of the first clamp 11 is provided with an exhaust pipe 14, one end of which is connected to the inside of the first clamp 11, and the other end extends to the outside, for discharging gas in the sealing space between the clamp element 1 and the pipeline. The exhaust pipe 14 is controlled by a first valve 15, which can be opened or closed according to actual needs to realize flexible regulation and control of the exhaust process; the middle part of the second clamp 12 is provided with a drain pipe 16, one end of which is connected to the inside of the clamp element 1, and the other end is connected to the outside, mainly for discharging liquid in the sealing space. The drain pipe 16 is controlled by a second valve 17, which is used in cooperation with the first valve 15 to realize exhaust and drainage operations respectively.

[0030] Referring to Figure 3In one embodiment provided in this application, the auxiliary element 2 includes a sealing bolt 21 disposed at the top of the overflow plate 13. The bottom end of the sealing bolt 21 extends through the first clamp 11 and the second clamp 12 to the outside and is connected to the nut 22. By tightening the nut 22, the sealing bolt 21 applies a clamping force to the first clamp 11 and the second clamp 12, thereby firmly fixing them to the pipe and achieving the installation and fixation of the device. The sealing bolt 21 is evenly distributed along the length of the first clamp 11 and the second clamp 12. This even distribution allows the clamping force to be evenly transmitted on the clamps, avoiding gaps between the clamps and the pipe due to uneven force distribution, thus ensuring the stability of the fixing effect and sealing performance.

[0031] The sealing bolts 21 are evenly arranged along the length of the first clamp 11 and the second clamp 12.

[0032] Reference Figures 3-5 In some embodiments, the sealing element 3 includes filling grooves 31 disposed at both ends of the first clamp 11 and the second clamp 12, with rubber pads 32 disposed on both sides of the filling grooves 31. The filling grooves 31 are groove-shaped, providing a space for filling the sealing material. The rubber pads 32 are disposed on both sides of the filling grooves 31. The rubber pads 32 have good elasticity and sealing performance. When the clamp element is fixed, the rubber pads 32 will be squeezed and deformed, tightly fitting the outer wall of the pipe and the inner wall of the clamp, forming a preliminary sealing barrier.

[0033] A metal mesh interlayer 33 is provided between the two rubber gaskets 32 and on the surface in contact with the filling groove 31. The filling material in the filling groove 31 is flexible graphite filler. The metal mesh interlayer 33 is woven from a metal material with certain strength and toughness, which can enhance the overall strength of the sealing structure and prevent the sealing material from being excessively deformed or lost under pressure. The filling material in the filling groove 31 is flexible graphite filler, which has excellent high temperature resistance, corrosion resistance and sealing performance, and can adapt to the working conditions of different media in the pipeline. A shape memory metal 34 is provided in the metal mesh interlayer 33. The shape memory metal 34 has a unique shape memory effect. The arc-shaped shape memory metal 34 is used to support the metal mesh interlayer 33. When the temperature changes during pipeline operation, the shape memory metal 34 will deform, applying a continuous force to the metal mesh interlayer 33.

[0034] A shape memory metal 34 is disposed inside the metal mesh interlayer 33, wherein the shape memory metal 34 is arranged in an arc shape to support the metal mesh interlayer 33.

[0035] The first clamp 11 and the second clamp 12 are provided with filling ports 35 at both ends, and the filling ports 35 are provided with pressure flanges 36 inside, which are used to seal the filling groove 31.

[0036] The flange 36 is fixed to the ends of the first clamp 11 and the second clamp 12 by fastening bolts 37, which are perpendicular to the first clamp 11 and the second clamp 12. Both ends of the first clamp 11 and the second clamp 12 are provided with filling ports 35, which are connected to the filling groove 31 and serve as channels for injecting flexible graphite filler into the filling groove 31. The flange 36 is installed inside the filling port 35 to seal the filling groove 31 and prevent leakage of the filled flexible graphite filler from the filling port 35. The flange 36 is fixed to the ends of the first clamp 11 and the second clamp 12 by fastening bolts 37, which are perpendicular to the first clamp 11 and the second clamp 12. This arrangement allows the fastening bolts 37 to apply vertical pressure to the flange 36, ensuring that the flange 36 tightly fits the filling port 35 and improving the reliability of the seal.

[0037] First, the first clamp 11 and the second clamp 12 are clamped at the leaking pipe. Then, the first clamp 11 and the second clamp 12 are fixed to the leaking pipe with the sealing bolt 21. The rubber gasket 32 ​​is used for initial sealing. When the device is fixed, due to the large internal air pressure, the first valve 15 and the second valve 17 need to be opened. The gas and liquid in the clamp are discharged through the exhaust pipe 14 and the drainage pipe 16 to relieve pressure, which facilitates the subsequent welding between the first clamp 11 and the second clamp 12. Reducing the internal pressure can effectively improve the welding effect and efficiency. At the same time, the liquid and gas will not leak and cause burns during welding. After welding, the flexible graphite filler is filled into the filling groove 31 through the filling port 35. Since the filling groove is equipped with a metal mesh interlayer 34, it can provide the firmness of the flexible graphite filler. After a long time, the shape memory metal will be affected by the high temperature and will exert force on the metal mesh clamp 34. During the process of applying force, the flexible graphite filler will be squeezed outward, making the flexible graphite filler fit the leaking pipe better.

[0038] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A small-diameter pipe sealing device, characterized in that: include, Clamping component (1); Auxiliary element (2), the auxiliary element (2) is located on both sides of clamp element (1), the clamp element (1) is opened, closed and fixed by the auxiliary element (2); and A sealing element (3) is located at the contact surface between the clamp element (1) and the pipe. The sealing element (3) is used to form a sealing fit with the outer wall of the pipe.

2. The small-diameter pipe sealing device according to claim 1, characterized in that: The clamp element (1) includes a first clamp (11) and a second clamp (12). The diameters at both ends of the first clamp (11) and the second clamp (12) are smaller than the diameter in the middle. The middle part of the first clamp (11) and the second clamp (12) is semi-circular, and overflow plates (13) are provided on both sides.

3. The small-diameter pipe sealing device according to claim 2, characterized in that: The auxiliary element (2) includes a sealing bolt (21) disposed at the top of the overflow plate (13), the bottom end of which extends through the first clamp (11) and the second clamp (12) to the outside and is connected to the nut (22).

4. The small-diameter pipe sealing device according to claim 3, characterized in that: The sealing bolts (21) are evenly arranged along the length of the first clamp (11) and the second clamp (12).

5. The small-diameter pipe sealing device according to claim 4, characterized in that: The sealing element (3) includes a filling groove (31) disposed at both ends of the first clamp (11) and the second clamp (12), and rubber pads (32) are disposed on both sides of the filling groove (31).

6. The small-diameter pipe sealing device according to claim 5, characterized in that: A metal mesh interlayer (33) is provided between the two rubber pads (32) and on the surface in contact with the filling groove (31), wherein the filling material in the filling groove (31) is flexible graphite filler.

7. The small-diameter pipe sealing device according to claim 6, characterized in that: The metal mesh interlayer (33) is provided with shape memory metal (34), wherein the shape memory metal (34) is arranged in an arc shape to support the metal mesh interlayer (33).

8. The small-diameter pipe sealing device according to claim 7, characterized in that: The first clamp (11) and the second clamp (12) are provided with filling ports (35) at both ends. The filling ports (35) are provided with pressure flanges (36) inside to seal the filling groove (31).

9. The small-diameter pipe sealing device according to claim 8, characterized in that: The flange (36) is fixed to the ends of the first clamp (11) and the second clamp (12) by fastening bolts (37), and the fastening bolts (37) are perpendicular to the first clamp (11) and the second clamp (12).

10. The small-diameter pipe sealing device according to claim 9, characterized in that: The first clamp (11) has an exhaust pipe (14) in the middle part, which is controlled by a first valve (15). The second clamp (12) has a drainage pipe (16) in the middle part, which is controlled by a second valve (17).

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