A drop-type leakage cut-off device and its application

Abstract

This invention provides a drop-type leakage shut-off device and its application, comprising a pipe wall, a buoyancy plugging component, and a base. The buoyancy plugging component is arranged at the top of the pipe wall and slides up and down along the inner wall of the pipe wall. The base is arranged at the bottom of the pipe wall, and the base and the buoyancy plugging component are in close contact during operation. This invention ensures that when a medium leaks, the buoyancy of the buoyancy plugging component is reduced, causing the buoyancy plugging component to descend and exert pressure on the sealing surface of the base, thereby cutting off the leakage of downstream medium. This ensures timely sealing when pipeline leaks occur, reducing the medium leakage rate and the risk of personnel injury.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas storage and transportation applications, specifically relating to a drop-type leakage cutoff device and its application. Background Technology

[0002] To meet the storage requirements of various process media within the oil and gas field, separators or storage tanks are often installed in the process flow. Depending on the process media, the storage tanks are either pressurized spherical or atmospheric pressure vertical. To allow different process media to enter and exit the storage tanks, separate inlet and outlet pipelines are often installed at the bottom of the tank. Shut-off valves on these pipelines control the entry, exit, and transfer of process media. When corrosive media are present, corrosion can cause perforations in the inlet and outlet pipelines at the bottom of the tank, leading to leaks. This compromises stable pipeline operation and production efficiency. The safety problems caused by leaks due to corrosion perforation between the inlet / outlet shut-off valves and the bottom of the tank are particularly severe, requiring more complex plugging measures and increasing the risk of injury to on-site emergency personnel.

[0003] Currently, when addressing leaks in inlet / outlet pipelines between the bottom of the storage tank and the shut-off valve, the common method is to seal the leak point using a clamp-like device. Different pressure rating clamps are selected for different pressure media in the separator or storage tank to avoid leaks that cannot be completely sealed. However, this method has drawbacks: emergency personnel must manually install the clamps at close range, risking injury from the high-pressure media, and the work involves cumbersome preparation of spare clamps of varying pressure ratings and specifications. Summary of the Invention

[0004] The purpose of this invention is to provide a drop-type leakage shut-off device and its application, which solves the problems of cumbersome procedures and low safety in the existing sealing of puncture leaks between the bottom of the storage tank and the shut-off valve.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides a drop-type leakage cut-off device, comprising a pipe wall, a buoyancy sealing element and a base, wherein the buoyancy sealing element is arranged on the top of the pipe wall and slides up and down along the inner wall of the pipe wall; the base is arranged on the bottom of the pipe wall and is in close contact with the buoyancy sealing element during operation.

[0007] Preferably, the base and the buoyancy sealing element are arranged concentrically.

[0008] Preferably, the buoyancy sealing component includes a buoyancy component and a sealing component, wherein the buoyancy component is installed on the top of the sealing component, and the bottom of the sealing component cooperates with the base; the buoyancy component and the sealing component are arranged concentrically.

[0009] Preferably, the sealing component is a conical structure, and the upper end of the base has a conical hole, in which the conical sealing component is assembled.

[0010] Preferably, the sealing element is a spherical structure, and the upper end of the base has a spherical hole, in which the spherical sealing element is assembled.

[0011] Preferably, the buoyancy component and the sealing component are detachably connected.

[0012] Preferably, the buoyancy component and the sealing component are an integral structure.

[0013] Preferably, the pipe wall is provided with a limiting member for limiting the up-and-down sliding of the buoyancy sealing member.

[0014] Preferably, the limiting member includes multiple fulcrums, wherein the multiple fulcrums are evenly distributed circumferentially on the inner side of the pipe wall; a pawl is rotatably connected to each fulcrum; and the two ends of each pawl are respectively connected to the upper and lower ends of the buoyancy sealing member.

[0015] Preferably, the fulcrum and the buoyancy sealing element are arranged concentrically.

[0016] Preferably, each pawl is connected to a tension spring, the free end of which is fixed to the inside of the tube wall.

[0017] Preferably, the pipe wall is provided with sieve holes arranged in a matrix, and the sieve holes are positioned above the base.

[0018] An application of a drop-out leakage shut-off device, wherein the shut-off device is installed at the inlet / outlet pipe opening between the bottom of the storage tank and the shut-off valve.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] The present invention provides a drop-type leakage cut-off device, which utilizes the vertical floating and telescopic action of the buoyancy sealing element to form an opening or seal with the base. At the same time, it can ensure that when the medium leaks, the buoyancy of the buoyancy sealing element is reduced, so that the buoyancy sealing element descends and puts pressure on the sealing surface of the base, thereby cutting off the leakage of downstream medium.

[0021] This invention provides an application of a drop-type leakage shut-off device. This device, equipped with a floating conical or spherical mechanism, is installed on the inlet and outlet pipelines at the bottom of existing separators or storage tanks. The device is fixed above the inlet and outlet pipe openings, and the position of the conical or spherical mechanism within the device changes with the buoyancy of the fluid medium. The position of the conical or spherical mechanism is automatically adjusted by the change in buoyancy. During normal operation, the conical or spherical mechanism is far from the base and does not affect the normal process flow. When a leak occurs in the pipeline, the fluid flow exceeds the process flow, and the fluid generates vortex buoyancy, causing the conical or spherical mechanism to descend and block the base, ensuring timely sealing of the pipeline leak and reducing the risk of media leakage and personnel injury. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the application of the cutting-off device;

[0023] Figure 2 This is a schematic diagram of a cutting device with sieve holes;

[0024] Figure 3 This is a schematic diagram of the cutting device without sieve holes;

[0025] Figure 4 This is a schematic diagram of a cutting device without sieve holes and equipped with a tension spring.

[0026] Figure 5 This is a schematic diagram of the structure when the cutting device cuts off the wires;

[0027] Among them, 1. Liquid level of storage tank (separator); 2. Tank wall of storage tank (separator); 3. Body of shut-off device; 4. Inlet and outlet pipeline ports; 5. Connecting flange; 6. Shut-off valve. Detailed Implementation

[0028] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0029] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0030] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0031] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0032] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0034] Example 1

[0035] This embodiment provides a drop-type leak shut-off device, which is suitable for emergency shut-off when a leak occurs in a process separator (storage tank, pipeline) within an oil and gas station.

[0036] The invention specifically includes a cutting device body 3, which includes a pipe wall 32, a buoyancy sealing element and a base 36. The buoyancy sealing element is arranged on the top of the pipe wall 32 and slides up and down along the inner wall of the pipe wall 32. The base 36 is arranged on the bottom of the pipe wall and is in close contact with the buoyancy sealing element during operation.

[0037] The limiting component is arranged at the top of the pipe wall 32 and is used to limit the buoyancy sealing component when it slides up and down.

[0038] The base 36 and the buoyancy sealing component are arranged concentrically.

[0039] The working process of this embodiment:

[0040] When the flow rate of the medium passing through the pipe wall 32 exceeds the design, a strong vortex is formed above the buoyancy plug. At this time, the buoyancy of the buoyancy plug decreases, causing the buoyancy plug to begin to descend under the action of gravity and seal with the base 36. Due to the increase in the pressure difference between the upper and lower ends of the buoyancy plug, the buoyancy plug and the base 36 "settle" together, completing the cutoff of the medium.

[0041] Example 2

[0042] This embodiment provides a drop-type leakage shut-off device, the invention specifically including a shut-off device body 3, which includes a pipe wall 32, a buoyancy sealing element and a base 36, wherein the buoyancy sealing element is arranged on the top of the pipe wall 32 and slides up and down along the inner wall of the pipe wall 32; the base 36 is arranged on the bottom of the pipe wall, and the base 36 is in close contact with the buoyancy sealing element during operation.

[0043] The limiting component is arranged at the top of the pipe wall 32 and is used to limit the buoyancy sealing component when it slides up and down.

[0044] The base 36 and the buoyancy sealing component are arranged concentrically.

[0045] The buoyancy sealing component includes a buoyancy component 31 and a sealing component 35, wherein the buoyancy component 31 is installed on top of the sealing component 35 and the two are arranged concentrically.

[0046] The bottom of the sealing component 35 mates with the base 36.

[0047] Example 3

[0048] This embodiment provides a drop-type leakage shut-off device, the invention specifically including a shut-off device body 3, which includes a pipe wall 32, a buoyancy sealing element and a base 36, wherein the buoyancy sealing element is arranged on the top of the pipe wall 32 and slides up and down along the inner wall of the pipe wall 32; the base 36 is arranged on the bottom of the pipe wall, and the base 36 is in close contact with the buoyancy sealing element during operation.

[0049] The limiting component is arranged at the top of the pipe wall 32 and is used to limit the buoyancy sealing component when it slides up and down.

[0050] The base 36 and the buoyancy sealing component are arranged concentrically.

[0051] The buoyancy sealing component includes a buoyancy component 31 and a sealing component 35, wherein the buoyancy component 31 is installed on top of the sealing component 35 and the two are arranged concentrically.

[0052] The bottom of the sealing component 35 mates with the base 36.

[0053] The sealing component 35 has a conical structure, and the upper end of the base 36 has a conical hole. The sealing component with the conical structure cooperates with the conical hole on the base 36.

[0054] Example 4

[0055] This embodiment provides a drop-type leakage shut-off device, the invention specifically including a shut-off device body 3, which includes a pipe wall 32, a buoyancy sealing element and a base 36, wherein the buoyancy sealing element is arranged on the top of the pipe wall 32 and slides up and down along the inner wall of the pipe wall 32; the base 36 is arranged on the bottom of the pipe wall, and the base 36 is in close contact with the buoyancy sealing element during operation.

[0056] The limiting component is arranged at the top of the pipe wall 32 and is used to limit the buoyancy sealing component when it slides up and down.

[0057] The base 36 and the buoyancy sealing component are arranged concentrically.

[0058] The buoyancy sealing component includes a buoyancy component 31 and a sealing component 35, wherein the buoyancy component 31 is installed on top of the sealing component 35 and the two are arranged concentrically.

[0059] The bottom of the sealing component 35 mates with the base 36.

[0060] The buoyancy component 31 and the sealing component 35 are an integral structure.

[0061] Example 5

[0062] This embodiment provides a drop-type leakage shut-off device, the invention specifically including a shut-off device body 3, which includes a pipe wall 32, a buoyancy sealing element and a base 36, wherein the buoyancy sealing element is arranged on the top of the pipe wall 32 and slides up and down along the inner wall of the pipe wall 32; the base 36 is arranged on the bottom of the pipe wall, and the base 36 is in close contact with the buoyancy sealing element during operation.

[0063] The limiting component is arranged at the top of the pipe wall 32 and is used to limit the buoyancy sealing component when it slides up and down.

[0064] The base 36 and the buoyancy sealing component are arranged concentrically.

[0065] The buoyancy sealing component includes a buoyancy component 31 and a sealing component 35, wherein the buoyancy component 31 is installed on top of the sealing component 35 and the two are arranged concentrically.

[0066] The bottom of the sealing component 35 mates with the base 36.

[0067] The buoyancy component 31 and the sealing component 35 are detachably connected.

[0068] Example 6

[0069] This embodiment provides a drop-type leakage shut-off device, the invention specifically including a shut-off device body 3, which includes a pipe wall 32, a buoyancy sealing element and a base 36, wherein the buoyancy sealing element is arranged on the top of the pipe wall 32 and slides up and down along the inner wall of the pipe wall 32; the base 36 is arranged on the bottom of the pipe wall, and the base 36 is in close contact with the buoyancy sealing element during operation.

[0070] The limiting component is arranged at the top of the pipe wall 32 and is used to limit the buoyancy sealing component when it slides up and down.

[0071] The base 36 and the buoyancy sealing component are arranged concentrically.

[0072] The pipe wall 32 is provided with a limiting component for limiting the up-and-down sliding of the buoyancy sealing component.

[0073] This structure ensures that the buoyancy sealing component moves vertically without escaping, thus limiting the vertical sliding of the buoyancy sealing component.

[0074] Example 7

[0075] This embodiment provides a drop-type leakage shut-off device, the invention specifically including a shut-off device body 3, which includes a pipe wall 32, a buoyancy sealing element and a base 36, wherein the buoyancy sealing element is arranged on the top of the pipe wall 32 and slides up and down along the inner wall of the pipe wall 32; the base 36 is arranged on the bottom of the pipe wall, and the base 36 is in close contact with the buoyancy sealing element during operation.

[0076] The limiting component is arranged at the top of the pipe wall 32 and is used to limit the buoyancy sealing component when it slides up and down.

[0077] The base 36 and the buoyancy sealing component are arranged concentrically.

[0078] The pipe wall 32 is provided with a limiting component for limiting the up-and-down sliding of the buoyancy sealing component.

[0079] The limiting member includes multiple fulcrums 34, wherein the multiple fulcrums 34 are evenly distributed circumferentially on the inner side of the pipe wall 32.

[0080] Each fulcrum 34 is rotatably connected to a pawl 33.

[0081] Each pawl 33 has its two ends abutting against the upper and lower ends of the buoyancy sealing component, respectively.

[0082] The fulcrum 34 is concentric with the center of gravity of the buoyancy sealing component.

[0083] The buoyancy sealing component is fitted into the pawl 33 to create a vertical floating effect, ensuring that the buoyancy sealing component moves vertically without escaping, thus limiting the vertical sliding of the buoyancy sealing component.

[0084] Example 8

[0085] This embodiment provides a drop-type leakage shut-off device, the invention specifically including a shut-off device body 3, which includes a pipe wall 32, a buoyancy sealing element and a base 36, wherein the buoyancy sealing element is arranged on the top of the pipe wall 32 and slides up and down along the inner wall of the pipe wall 32; the base 36 is arranged on the bottom of the pipe wall, and the base 36 is in close contact with the buoyancy sealing element during operation.

[0086] The limiting component is arranged at the top of the pipe wall 32 and is used to limit the buoyancy sealing component when it slides up and down.

[0087] The base 36 and the buoyancy sealing component are arranged concentrically.

[0088] The pipe wall 32 is provided with a limiting component for limiting the up-and-down sliding of the buoyancy sealing component.

[0089] The limiting member includes multiple fulcrums 34, wherein the multiple fulcrums 34 are evenly distributed circumferentially on the inner side of the pipe wall 32.

[0090] Each pivot 34 is rotatably connected to a pawl 33.

[0091] Each pawl 33 has its two ends abutting against the upper and lower ends of the buoyancy sealing component, respectively.

[0092] The fulcrum 34 is concentric with the center of gravity of the buoyancy sealing component.

[0093] Each pawl 33 is connected to a tension spring 38, the free end of which is fixed to the inside of the tube wall 32.

[0094] When the sealing component 35 is in place, the tension spring 38 provides a supporting force and a balancing downward stabilizing force to the buoyancy component 31.

[0095] Example 9

[0096] This embodiment provides a drop-type leakage shut-off device, the invention specifically including a shut-off device body 3, which includes a pipe wall 32, a buoyancy sealing element and a base 36, wherein the buoyancy sealing element is arranged on the top of the pipe wall 32 and slides up and down along the inner wall of the pipe wall 32; the base 36 is arranged on the bottom of the pipe wall, and the base 36 is in close contact with the buoyancy sealing element during operation.

[0097] The limiting component is arranged at the top of the pipe wall 32 and is used to limit the buoyancy sealing component when it slides up and down.

[0098] The base 36 and the buoyancy sealing component are arranged concentrically.

[0099] The pipe wall 32 is provided with a plurality of screen holes 37 arranged in an array. The screen holes are arranged above the base 36. This structure can be used when the cut-off device body 3 cannot meet the normal flow requirements in its normal state.

[0100] Example 10

[0101] This embodiment provides an application of a drop-type leakage shut-off device, in which the shut-off device body 3 described in Embodiment 1 is used on the inlet and outlet pipelines between the bottom of the storage tank and the shut-off valve.

[0102] Specifically, the cut-off device body 3 is disposed on the pipe wall of the inlet / outlet pipeline 4 and forms a seal.

[0103] When a leak occurs in the inlet / outlet pipeline, the increased flow of the medium in the shut-off device body 3 generates a stronger vortex effect. The buoyancy of the buoyancy-sealing component located inside the pipe wall 32 decreases, and the buoyancy of the buoyancy-sealing component gradually exceeds that of the buoyancy-sealing component. During the continuous buoyancy reduction process (increased leakage), the weight of the buoyancy-sealing component (including the pressure difference) increases the relative buoyancy of the buoyancy-sealing component, causing the buoyancy-sealing component to descend and form a close contact effect with the conical hole of the base 36. This significantly reduces the flow rate discharged through the buoyancy-sealing component and the base 36 into the inlet / outlet pipeline port 4, thereby ensuring the shut-off of the shut-off device body 3 and reducing the probability of untimely shut-off of the leak point due to corrosion or perforation of the inlet / outlet pipeline port 4.

[0104] This invention employs a shut-off device with a floating conical or spherical mechanism installed on the inlet and outlet pipelines at the bottom of existing separators or storage tanks. The shut-off device is fixed above the inlet and outlet pipe openings, and the position of the conical or spherical mechanism within the device changes with the buoyancy of the fluid medium. The position of the conical or spherical mechanism is automatically adjusted by the change in buoyancy. During normal operation, the conical or spherical mechanism is positioned far from the base, not affecting the normal process flow rate. When a pipeline leak occurs, the fluid flow rate exceeds the process flow rate, generating vortex buoyancy and causing the conical or spherical mechanism to descend and block the base, ensuring timely sealing of pipeline leaks and reducing the risk of media leakage and personnel injury.

[0105] Example 11

[0106] This embodiment provides a drop-type leakage cutoff device, including a buoyancy component 31, a pipe wall 32, a pawl 33, a fulcrum 34, a sealing component 35, a base 36, a sieve hole 37, and a tension spring 38. The buoyancy component 31 and the sealing component 35 are concentrically arranged inside the pipe wall 32, and the base 36, corresponding to the sealing component 35, is concentrically arranged inside the pipe wall 32 and forms a seal with the pipe wall 32.

[0107] The fulcrum 34 is evenly distributed on the inner side of the pipe wall 32 and is concentric (coincident) with the center of gravity of the combined body formed by the buoyancy component 31 and the sealing component 35.

[0108] The pawl 33 is fitted into the fulcrum 34 to form a rotatable connection. The buoyancy component 31 and the sealing component 35 penetrate the inner side of the pawl 33 and form an elastic push with the upper and lower ends of the pawl 33.

[0109] During operation, the cut-off device body 3 is installed on the inlet and outlet pipe port 4 to form a sealed connection. The composite body formed by the buoyancy component 31 and the sealing component 35 is inserted into the inner side of the pipe wall 32 through the upper end of the pawl 33 and is concentrically set with the base 36 to form a vertical floating and telescopic effect.

[0110] The combined body formed by the buoyancy component 31 and the sealing component 35 descends and comes into close contact with the conical sealing hole of the base 36. As it continues to sink (buoyancy decreases), the lower end of the pawl 33 pushes against the side of the sealing component 35, creating an expansion effect. The combined body formed by the buoyancy component 31 and the sealing component 35 continues to descend inside the pipe wall 32 and comes into close contact with the base 36. The flow rate of the oil and gas medium entering the pipe wall 32 and being discharged through the base 36 to the inlet / outlet pipeline port 4 decreases, and the pressure difference between the upper and lower ends of the combined body formed by the buoyancy component 31 and the sealing component 35 increases. The greater the pressure difference between the upper and lower ends of the combined body formed by the buoyancy component 31 and the sealing component 35, the faster the relative movement of the sealing component 35 and the base 36, and the greater the leakage between the inlet / outlet pipeline port 4 and the shut-off valve 6. This causes the sealing component 35 and the base 36 to "settle tightly" and form a self-sealing effect, thereby reducing the probability and risk of the sealing component 35 and the base 36 failing to shut off due to uncontrollable leakage.

[0111] Work process:

[0112] like Figure 1The cut-off device body 3 is placed on the pipe wall of the inlet / outlet pipeline 4 to form a seal. The composite body formed by the buoyancy component 31 and the sealing component 35 is concentrically fitted in the pawl 33 to form a vertical floating effect. When the flow rate of the medium passing through the cut-off device body 3 exceeds the design, a strong vortex is formed above the buoyancy component 31, which reduces the buoyancy of the buoyancy component 31. Under the gravity of the sealing component 35, the buoyancy component 31 moves downward and forms a close contact with the conical seal of the base 36. The flow rate of the medium through the conical hole of the base 36 gradually decreases, which increases the pressure difference between the upper and lower ends of the buoyancy component 31 and the sealing component 35, so that the sealing component 35 and the conical hole of the base 36 form a "seated" cut-off effect. The pawl 33, which is set on the inner side of the pipe wall 32, is supported by the fulcrum 34, so that the composite body formed by the buoyancy component 31 and the sealing component 35 is concentric with the pipe wall 32.

[0113] When a leak occurs in the inlet / outlet pipeline, the increased flow rate of the medium in the shut-off device body 3 generates a stronger vortex effect. The buoyancy of the buoyancy component 31 located on the upper inner side of the pipe wall 32 decreases, and the weight (including the pressure difference) of the combined body formed by the buoyancy component 31 and the sealing component 35 gradually exceeds the buoyancy of the buoyancy component 31. During the continuous buoyancy reduction process (increased leakage), the weight (including the pressure difference) of the combined body formed by the buoyancy component 31 and the sealing component 35 increases relative to the buoyancy of the buoyancy component 31. This causes the sealing component 35 to descend and form a close contact effect with the conical hole of the base 36, significantly reducing the flow rate discharged through the conical component and the base 36 into the inlet / outlet pipeline port 4. This ensures the shut-off of the shut-off device body 3 and reduces the probability of delayed shut-off due to corrosion or perforation of the inlet / outlet pipeline port 4.

[0114] In addition, the fulcrum 34 set around the upper inner side of the pipe wall 32 causes the pawl 33 to rotate tightly against the combined body formed by the buoyancy component 31 and the sealing component 35, ensuring that the combined body formed by the buoyancy component 31 and the sealing component 35 is concentric with the conical hole of the base 36. Ultimately, the sealing component 35 and the conical sealing surface of the base 36 are completely cut off. The medium pressure difference and the pawl 33 work together to overcome the phenomenon of the combined body formed by the buoyancy component 31 and the sealing component 35 rising due to the recovery of buoyancy after the cut-off (when the pipeline leakage is not large). This achieves the purpose of continuous cut-off and no leakage in the separator (storage tank) before the failure of the inlet and outlet pipelines is completely dealt with.

[0115] Meanwhile, the upper and lower ends of the pawl 33 are asymmetrically arranged with the fulcrum 34 as the center. When the buoyancy component 31 and the sealing component 35 move up and down, the upper and lower ends of the pawl 33 are tightly attached to their respective upper and lower parts to ensure that they go straight up and down without escaping.

[0116] A tension spring 38 is provided at the lower end of the pawl 33, and the free end of the tension spring 38 is arranged inside the pipe wall 32. When the sealing member 35 is locked, the tension spring 38 provides a supporting force and a balancing downward stabilizing force to the buoyancy member 31.

[0117] After the sealing component 35 and the base 36 are fixed in place and the leak point of the inlet and outlet pipeline is dealt with, a harmless and non-flammable medium such as water must be injected into the leaking pipeline section to pressurize it. The pressure is then reversed until the lower end of the base 36 tapered hole is pushed open to the normal position before the pipeline can be put back into operation.

[0118] The volume of the buoyancy component 31 needs to be considered in conjunction with the self-weight of the buoyancy component 31 and the sealing component 35, the normal flow limit, and the action value of the change in buoyancy caused by the size of the vortex when leakage occurs, so as to match the timely downward movement when leakage occurs.

[0119] When the cut-off device body 3 cannot meet the normal flow requirements under normal conditions, a cut-off device with 37-sieve holes (optional) can be used to meet the flow requirements. The vortex generated during leakage will also affect the buoyancy of the buoyancy component 31.

[0120] The buoyancy component 31 and the sealing component 35 can be integrally formed or disassembled and installed, but they must be kept concentric so that they can go straight up and down.

[0121] Pawls 33 and fulcrums 34 are evenly arranged on the inner side of the pipe wall 32, with a quantity of 3 or more, so as to ensure that the buoyancy component 31 and the sealing component 35 move straight up and down.

[0122] The sealing element 35 can also be spherical or other shapes, the purpose of which is to form a self-sealing effect when cut off.

[0123] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A drop-out leakage shut-off device, characterized in that, The device includes a pipe wall (32), a buoyancy plug and a base (36), wherein the buoyancy plug is arranged on the top of the pipe wall (32) and slides up and down along the inner wall of the pipe wall (32); the base (36) is arranged on the bottom of the pipe wall and is in close contact with the buoyancy plug during operation; the base (36) and the buoyancy plug are arranged concentrically. The buoyancy sealing component includes a buoyancy component (31) and a sealing component (35), wherein the buoyancy component (31) is a spherical crown structure and the sealing component (35) is a frustum structure; the buoyancy component (31) is installed at the large end of the sealing component (35), and the small end of the sealing component (35) is matched with the base (36); the buoyancy component (31) and the sealing component (35) are arranged concentrically; the radius of the lower end face of the buoyancy component (31) is equal to the radius of the large end face of the sealing component (35) and their outer edges coincide; The upper end of the base (36) is provided with a frustum-shaped hole, and the sealing member of the frustum-shaped structure is assembled in the frustum-shaped hole; The pipe wall (32) is provided with a limiting component for limiting the up and down sliding of the buoyancy sealing component; The limiting component includes multiple fulcrums (34), wherein the multiple fulcrums (34) are evenly distributed circumferentially on the inner side of the pipe wall (32); a pawl (33) is rotatably connected to each fulcrum (34); the two ends of each pawl (33) are respectively connected to the upper and lower ends of the buoyancy sealing component. The fulcrum (34) is arranged concentrically with the buoyancy sealing component; Each pawl (33) is connected to a tension spring (38), the free end of which is fixed to the inside of the tube wall (32); The pawl (33) has an arc-shaped structure with its concave surface facing the center of the buoyancy sealing component.

2. The drop-out leakage shut-off device according to claim 1, characterized in that, The buoyancy component (31) and the sealing component (35) are detachably connected.

3. The drop-out leakage shut-off device according to claim 1, characterized in that, The buoyancy component (31) and the sealing component (35) are an integral structure.

4. The drop-out leakage shut-off device according to claim 1, characterized in that, The pipe wall (32) is provided with a matrix of sieve holes, which are located above the base.

5. The application of a drop-out leakage shut-off device, characterized in that, The shut-off device according to any one of claims 1-4 is installed at the inlet / outlet pipe opening between the bottom of the storage tank and the shut-off valve.

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