Drop type leakage cut-off device and application

Abstract

The invention provides a falling type leakage cut-off device and application, the falling type leakage cut-off device comprises a pipe wall, a buoyancy plugging piece and a base, and the buoyancy plugging piece 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, the base is tightly attached to the buoyancy plugging piece during working, it can be guaranteed that when a medium leaks, due to the fact that the buoyancy obtained by the buoyancy plugging piece is reduced, the buoyancy plugging piece moves downwards to press the sealing face of the base, and then leakage of the downstream medium is cut off; and plugging during pipeline leakage is guaranteed, and the medium leakage rate and the personnel injury risk are reduced in time.

Description

Technical Field

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

[0002] In order to meet the storage requirements of various process media in the oil and gas station, separators or storage tanks are often installed in the process flow, and the storage tanks are set into pressurized spherical or normal pressure upright types according to different process media. In order to allow different process media in the storage tank to be input and output, it is often necessary to set different inlet and outlet pipelines at the bottom of the storage tank, and control the process operations such as inlet and outlet and tank emptying through the cut-off valves on the pipelines. When there is a corrosive medium, the inlet and outlet pipelines at the bottom of the storage tank will often be "perforated" due to corrosion, resulting in puncture and leakage, and the stable operation and production time of the pipeline cannot be guaranteed. In particular, when the pipeline between the inlet and outlet shut-off valves and the bottom of the storage tank is corroded and perforated, the safety problems caused by leakage will be more serious, the plugging measures will be more complicated, and the possibility of harm to on-site emergency personnel will be greater.

[0003] At present, when solving the problem of puncture leakage between the bottom of the storage tank and the shut-off valve of the inlet and outlet pipelines, the puncture leakage point is often blocked by using a device similar to a "clamp" to "block" the leakage point. Different pressure levels of clamp devices are selected for different pressure media in the separator or storage tank to avoid the problem that the leakage point cannot be blocked. The method of plugging leaks with clamps has the problems of emergency personnel being injured by high-pressure media when manually installing the "clamp" at close range and the need to prepare "clamp" spare parts of different pressure levels and specifications. Summary of the invention

[0004] The purpose of the present invention is to provide a drop-type leakage cut-off device and its application, which solves the problem of puncture leakage between the bottom of the existing storage tank and the cut-off valve, and the defects of complicated procedures and low safety when plugging.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The present invention provides a drop-type leakage cut-off device, comprising a pipe wall, a buoyancy plugging piece and a base, wherein the buoyancy plugging piece 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 piece are in close contact during operation.

[0007] Preferably, the base and the buoyancy blocking member are arranged concentrically.

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

[0009] Preferably, the blocking member is a conical structure, a conical hole is formed at the upper end of the base, and the blocking member of the conical structure is assembled in the conical hole.

[0010] Preferably, the blocking member is a spherical structure, a spherical hole is formed at the upper end of the base, and the blocking member with the spherical structure is assembled in the spherical hole.

[0011] Preferably, the buoyancy member and the blocking member are detachably connected.

[0012] Preferably, the buoyancy member and the blocking member are an integrated structure.

[0013] Preferably, a limiting member for limiting the upward and downward sliding movement of the buoyancy sealing member is provided on the tube wall.

[0014] Preferably, the limit member comprises a plurality of fulcrums, wherein the plurality of fulcrums are evenly distributed on the inner side of the tube wall along the circumferential direction; a pawl is rotatably connected to each fulcrum; and both ends of each pawl are respectively abutted against and connected to the upper and lower ends of the buoyancy sealing member.

[0015] Preferably, the fulcrum is arranged concentrically with the buoyancy blocking member.

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

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

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

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention provides a drop-type leakage cut-off device, which utilizes the floating and retractable action of a buoyancy sealing member to form an opening or seal with a base, and can also ensure that when a medium leaks, the buoyancy obtained by the buoyancy sealing member is reduced, so that the buoyancy sealing member moves downward to form a compressive effect on the sealing surface of the base, thereby cutting off leakage of the downstream medium.

[0021] The present invention provides an application of a drop-type leakage cut-off device, which uses a cut-off device with a floating conical or spherical mechanism to be set on the inlet and outlet pipelines at the bottom of the existing separator or storage tank, and the cut-off device is fixed on the inlet and outlet pipes. The position of the conical or spherical mechanism in the device changes with the buoyancy of the medium fluid. The position of the conical or spherical mechanism is automatically adjusted by the change of the buoyancy of the medium fluid. During normal operation, the position of the conical or spherical mechanism is far from the base and does not affect the normal process flow. When the pipeline leaks, the medium flow exceeds the process flow, the medium fluid generates a vortex buoyancy drop, and the conical or spherical mechanism descends to block the base, ensuring that the pipeline is blocked in time to reduce the medium leakage rate and the risk of personal injury. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the application of the cut-off device;

[0023] Figure 2 It is a schematic diagram of the structure of the cut-off device with a sieve hole;

[0024] Figure 3 It is a schematic diagram of the structure of the cut-off device without sieve holes;

[0025] Figure 4 It is a schematic diagram of the structure of the cut-off device without screen holes and with a tension spring;

[0026] Figure 5 It is a schematic diagram of the structure when the cutting device is cut off;

[0027] Among them, 1. liquid level of storage tank (separator); 2. tank wall of storage tank (separator); 3. shut-off device body; 4. inlet and outlet pipeline openings; 5. connecting flange; 6. shut-off valve. DETAILED DESCRIPTION

[0028] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

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

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

[0031] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0032] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0033] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0034] Example 1

[0035] The drop-type leakage cut-off device provided in this embodiment is suitable for emergency cut-off when a process separator (storage tank, pipeline) in an oil and gas station leaks.

[0036] The invention specifically includes a cut-off device body 3, which includes a tube wall 32, a buoyancy plugging member and a base 36, wherein the buoyancy plugging member is arranged at the top of the tube wall 32 and slides up and down along the inner wall of the tube wall 32; the base 36 is arranged at the bottom of the tube wall, and the base 36 is tightly attached to the buoyancy plugging member when working.

[0037] The limiting member is arranged at the top of the tube wall 32, and is used to limit the buoyancy blocking member when the buoyancy blocking member slides up and down.

[0038] The base 36 and the buoyancy blocking member are arranged concentrically.

[0039] The working process of this embodiment:

[0040] When the medium flow rate passing through the pipe wall 32 exceeds the design, a strong vortex is formed above the buoyancy sealing member. At this time, the buoyancy obtained by the buoyancy sealing member is reduced, so that the buoyancy sealing member begins to move downward under the action of gravity and forms a close seal with the base 36. Due to the increase in the pressure difference between the upper and lower ends of the buoyancy sealing member, the buoyancy sealing member and the base 36 are "seated" to complete the cutoff of the medium.

[0041] Example 2

[0042] The present embodiment provides a drop-type leakage cut-off device, whose invention point specifically includes a cut-off device body 3, which includes a tube wall 32, a buoyancy plugging piece and a base 36, wherein the buoyancy plugging piece is arranged at the top of the tube wall 32 and slides up and down along the inner wall of the tube wall 32; the base 36 is arranged at the bottom of the tube wall, and the base 36 is tightly attached to the buoyancy plugging piece when working.

[0043] The limiting member is arranged at the top of the tube wall 32, and is used to limit the buoyancy blocking member when the buoyancy blocking member slides up and down.

[0044] The base 36 and the buoyancy blocking member are arranged concentrically.

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

[0046] The bottom of the blocking member 35 matches with the base 36 .

[0047] Example 3

[0048] The present embodiment provides a drop-type leakage cut-off device, whose invention point specifically includes a cut-off device body 3, which includes a tube wall 32, a buoyancy plugging piece and a base 36, wherein the buoyancy plugging piece is arranged at the top of the tube wall 32 and slides up and down along the inner wall of the tube wall 32; the base 36 is arranged at the bottom of the tube wall, and the base 36 is tightly attached to the buoyancy plugging piece when working.

[0049] The limiting member is arranged at the top of the tube wall 32, and is used to limit the buoyancy blocking member when the buoyancy blocking member slides up and down.

[0050] The base 36 and the buoyancy blocking member are arranged concentrically.

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

[0052] The bottom of the blocking member 35 matches with the base 36 .

[0053] The blocking member 35 is a conical structure, and a conical hole is formed at the upper end of the base 36 . The blocking member 35 of the conical structure matches with the conical hole on the base 36 .

[0054] Example 4

[0055] The present embodiment provides a drop-type leakage cut-off device, whose invention point specifically includes a cut-off device body 3, which includes a tube wall 32, a buoyancy plugging piece and a base 36, wherein the buoyancy plugging piece is arranged at the top of the tube wall 32 and slides up and down along the inner wall of the tube wall 32; the base 36 is arranged at the bottom of the tube wall, and the base 36 is tightly attached to the buoyancy plugging piece when working.

[0056] The limiting member is arranged at the top of the tube wall 32, and is used to limit the buoyancy blocking member when the buoyancy blocking member slides up and down.

[0057] The base 36 and the buoyancy blocking member are arranged concentrically.

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

[0059] The bottom of the blocking member 35 matches with the base 36 .

[0060] The buoyancy member 31 and the blocking member 35 are an integrated structure.

[0061] Example 5

[0062] The present embodiment provides a drop-type leakage cut-off device, whose invention point specifically includes a cut-off device body 3, which includes a tube wall 32, a buoyancy plugging piece and a base 36, wherein the buoyancy plugging piece is arranged at the top of the tube wall 32 and slides up and down along the inner wall of the tube wall 32; the base 36 is arranged at the bottom of the tube wall, and the base 36 is tightly attached to the buoyancy plugging piece when working.

[0063] The limiting member is arranged at the top of the tube wall 32, and is used to limit the buoyancy blocking member when the buoyancy blocking member slides up and down.

[0064] The base 36 and the buoyancy blocking member are arranged concentrically.

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

[0066] The bottom of the blocking member 35 matches with the base 36 .

[0067] The buoyancy member 31 is detachably connected to the blocking member 35 .

[0068] Example 6

[0069] The present embodiment provides a drop-type leakage cut-off device, whose invention point specifically includes a cut-off device body 3, which includes a tube wall 32, a buoyancy plugging piece and a base 36, wherein the buoyancy plugging piece is arranged at the top of the tube wall 32 and slides up and down along the inner wall of the tube wall 32; the base 36 is arranged at the bottom of the tube wall, and the base 36 is tightly attached to the buoyancy plugging piece when working.

[0070] The limiting member is arranged at the top of the tube wall 32, and is used to limit the buoyancy blocking member when the buoyancy blocking member slides up and down.

[0071] The base 36 and the buoyancy blocking member are arranged concentrically.

[0072] The tube wall 32 is provided with a limiting member for limiting the upward and downward sliding movement of the buoyancy blocking member.

[0073] This structure can ensure that the buoyancy plugging piece moves straight up and down without escaping, thereby limiting the upward and downward sliding of the buoyancy plugging piece.

[0074] Example 7

[0075] The present embodiment provides a drop-type leakage cut-off device, whose invention point specifically includes a cut-off device body 3, which includes a tube wall 32, a buoyancy plugging piece and a base 36, wherein the buoyancy plugging piece is arranged at the top of the tube wall 32 and slides up and down along the inner wall of the tube wall 32; the base 36 is arranged at the bottom of the tube wall, and the base 36 is tightly attached to the buoyancy plugging piece when working.

[0076] The limiting member is arranged at the top of the tube wall 32, and is used to limit the buoyancy blocking member when the buoyancy blocking member slides up and down.

[0077] The base 36 and the buoyancy blocking member are arranged concentrically.

[0078] The tube wall 32 is provided with a limiting member for limiting the upward and downward sliding movement of the buoyancy blocking member.

[0079] The limiting member includes a plurality of supporting points 34 , wherein the plurality of supporting points 34 are evenly distributed on the inner side of the tube wall 32 along the circumferential direction.

[0080] A ratchet pawl 33 is rotatably connected to each fulcrum 34 .

[0081] Both ends of each pawl 33 are respectively in contact with the upper and lower ends of the buoyancy blocking member.

[0082] The fulcrum 34 is concentric with the center of gravity of the buoyancy plugging member.

[0083] The buoyancy blocking member is sleeved in the ratchet 33 to form a straight up and down floating effect, ensuring that the buoyancy blocking member moves straight up and down without escaping, thereby limiting the up and down sliding of the buoyancy blocking member.

[0084] Example 8

[0085] The present embodiment provides a drop-type leakage cut-off device, whose invention point specifically includes a cut-off device body 3, which includes a tube wall 32, a buoyancy plugging piece and a base 36, wherein the buoyancy plugging piece is arranged at the top of the tube wall 32 and slides up and down along the inner wall of the tube wall 32; the base 36 is arranged at the bottom of the tube wall, and the base 36 is tightly attached to the buoyancy plugging piece when working.

[0086] The limiting member is arranged at the top of the tube wall 32, and is used to limit the buoyancy blocking member when the buoyancy blocking member slides up and down.

[0087] The base 36 and the buoyancy blocking member are arranged concentrically.

[0088] The tube wall 32 is provided with a limiting member for limiting the upward and downward sliding movement of the buoyancy blocking member.

[0089] The limiting member includes a plurality of supporting points 34 , wherein the plurality of supporting points 34 are evenly distributed on the inner side of the tube wall 32 along the circumferential direction.

[0090] A ratchet pawl 33 is rotatably connected to each fulcrum 34 .

[0091] Both ends of each pawl 33 are respectively in contact with the upper and lower ends of the buoyancy blocking member.

[0092] The fulcrum 34 is concentric with the center of gravity of the buoyancy plugging member.

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

[0094] When the blocking member 35 is seated, the tension spring 38 provides a supporting force and a balanced downward stabilizing force to the buoyancy member 31 .

[0095] Example 9

[0096] The present embodiment provides a drop-type leakage cut-off device, whose invention point specifically includes a cut-off device body 3, which includes a tube wall 32, a buoyancy plugging piece and a base 36, wherein the buoyancy plugging piece is arranged at the top of the tube wall 32 and slides up and down along the inner wall of the tube wall 32; the base 36 is arranged at the bottom of the tube wall, and the base 36 is tightly attached to the buoyancy plugging piece when working.

[0097] The limiting member is arranged at the top of the tube wall 32, and is used to limit the buoyancy blocking member when the buoyancy blocking member slides up and down.

[0098] The base 36 and the buoyancy blocking member are arranged concentrically.

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

[0100] Example 10

[0101] This embodiment provides an application of a drop-type leakage cut-off device, in which the cut-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 cut-off valve.

[0102] Specifically, the cut-off device body 3 is arranged on the pipe wall of the inlet and outlet pipe opening 4 to form a seal.

[0103] When leakage occurs in the inlet and outlet pipelines, the cut-off device body 3 generates a stronger vortex effect due to the increase in the flow rate of the medium passing through it, and the buoyancy of the buoyancy plugging member on the inner side of the pipe wall 32 becomes smaller, and the buoyancy of the buoyancy plugging member gradually exceeds the buoyancy of the buoyancy plugging member. During the continuous buoyancy reduction process (increase in leakage), the gravity of the buoyancy plugging member (including the pressure difference effect) increases relative to the buoyancy of the buoyancy plugging member, so that the buoyancy plugging member moves downward and forms a close effect with the conical hole of the base 36, which significantly reduces the flow discharged to the inlet and outlet pipeline orifice 4 through the buoyancy plugging member and the base 36, thereby ensuring the cut-off of the cut-off device body 3 and reducing the probability of untimely cut-off of the leakage point due to corrosion and perforation of the inlet and outlet pipeline orifice 4.

[0104] The present invention adopts a cut-off device with a floating cone or spherical mechanism arranged on the inlet and outlet pipelines at the bottom of the existing separator or storage tank, and the cut-off device is fixed on the inlet and outlet pipes. The position of the cone or spherical mechanism in the device changes with the buoyancy of the medium fluid. The position of the cone or spherical mechanism is automatically adjusted by the change of the buoyancy of the medium fluid. During normal operation, the cone or spherical mechanism is far away from the base and does not affect the normal process flow. When the pipeline leaks, the medium flow exceeds the process flow, the medium fluid generates a vortex buoyancy drop, and the cone or spherical mechanism descends to block the base, ensuring that the pipeline is blocked in time when leaking to reduce the medium leakage rate and the risk of personal injury.

[0105] Embodiment 11

[0106] The present embodiment provides a drop-type leakage cut-off device, including a buoyancy member 31, a tube wall 32, a pawl 33, a fulcrum 34, a plugging member 35, a base 36, a sieve hole 37 and a tension spring 38, wherein the buoyancy member 31 and the plugging member 35 are concentrically arranged on the inner side of the tube wall 32, and the base 36 corresponding to the plugging member 35 is concentrically arranged on the inner side of the tube wall 32 to form a seal with the tube wall 32.

[0107] The fulcrums 34 are evenly arranged on the inner side of the tube wall 32 and are concentric with the combined center of gravity formed by the buoyancy member 31 and the blocking member 35 (the centers coincide with each other).

[0108] The pawl 33 is sleeved in the fulcrum 34 to form a rotatable connection. The buoyancy member 31 and the blocking member 35 penetrate the inner side of the pawl 33 and form elastic resistance 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 pipeline orifice 4 to form a sealed connection. The composite body formed by the buoyancy member 31 and the blocking member 35 is inserted into the inner side of the pipe wall 32 through the upper end of the ratchet 33 and is concentrically arranged with the base 36 to form a straight up and down floating telescopic effect.

[0110] The composite body formed by the buoyancy member 31 and the plugging member 35 moves downward and forms a close contact with the conical sealing hole of the base 36. When it continues to sink (buoyancy decreases), a push is generated between the lower end of the ratchet 33 and the side of the plugging member 35 to form an expansion effect, and the composite body formed by the buoyancy member 31 and the plugging member 35 continues to move downward on the inner side of the pipe wall 32 and approaches the base 36. The oil and gas medium entering the pipe wall 32 is discharged to the inlet and outlet pipeline port 4 through the base 36, and the flow rate is reduced, and the pressure difference between the upper and lower ends of the composite body formed by the buoyancy member 31 and the plugging member 35 increases. The greater the pressure difference between the upper and lower ends of the composite body formed by the buoyancy member 31 and the plugging member 35, the faster the relative movement of the plugging member 35 and the base 36, and the greater the leakage from the inlet and outlet pipeline port 4 to the shut-off valve 6, so that the plugging member 35 and the base 36 "sit tight" and form a self-sealing effect, thereby reducing the probability and risk of the plugging member 35 and the base 36 being unable to be closed due to uncontrollable leakage.

[0111] Working process:

[0112] like Figure 1The shutoff device body 3 is arranged on the pipe wall of the inlet and outlet pipe mouth 4 to form a seal. The composite body formed by the buoyancy member 31 and the plugging member 35 is concentrically sleeved in the ratchet 33 to form a straight up and down floating effect. When the medium flow rate passing through the shutoff device body 3 exceeds the design, a strong vortex is formed above the buoyancy member 31 to reduce the buoyancy of the buoyancy member 31. The buoyancy member 31 moves downward under the gravity of the plugging member 35 and forms a close effect with the conical seal of the base 36. The medium flow rate through the conical hole of the base 36 is gradually reduced, so that the pressure difference between the upper and lower ends of the buoyancy member 31 and the plugging member 35 body increases, so that the plugging member 35 and the conical hole of the base 36 form a "seating" shutoff effect. The ratchet 33 arranged on the inner side of the pipe wall 32 makes the composite body formed by the buoyancy member 31 and the plugging member 35 concentric with the pipe wall 32 under the support of the fulcrum 34.

[0113] When leakage occurs in the inlet and outlet pipelines, the cut-off device body 3 generates a stronger vortex effect due to the increase in the flow rate of the medium passing through it, and the buoyancy of the buoyancy member 31 located at the upper inner side of the pipe wall 32 becomes smaller, and the gravity (including the pressure difference effect) of the composite body formed by the buoyancy member 31 and the plugging member 35 gradually exceeds the buoyancy of the buoyancy member 31. In the process of continuous buoyancy reduction (increase in leakage), the gravity (including the pressure difference effect) of the composite body formed by the buoyancy member 31 and the plugging member 35 increases relative to the buoyancy of the buoyancy member 31, so that the plugging member 35 forms a close effect with the tapered hole of the base 36 when it descends, and the flow rate discharged to the inlet and outlet pipeline orifice 4 through the tapered member and the base 36 is significantly reduced, thereby ensuring the cut-off of the cut-off device body 3 and reducing the probability of untimely cut-off of the leakage point due to corrosion and perforation of the inlet and outlet pipeline orifice 4.

[0114] In addition, the fulcrum 34 arranged around the upper inner side of the pipe wall 32 enables the pawl 33 to rotate closely against the composite body formed by the buoyancy member 31 and the plugging member 35, ensuring that the composite body formed by the buoyancy member 31 and the plugging member 35 is concentric with the conical hole of the base 36, and finally the conical sealing surface of the plugging member 35 and the base 36 is completely cut off, and the medium pressure difference and the pawl 33 act simultaneously to overcome the upward phenomenon of the composite body formed by the buoyancy member 31 and the plugging member 35 caused by the buoyancy recovery after the cut-off (when the pipeline leakage is not large), so as to achieve the purpose of continuous cut-off without leakage of the separator (storage tank) before the inlet and outlet pipelines are processed after failure.

[0115] At the same time, the upper and lower ends of the pawl 33 are arranged asymmetrically with the fulcrum 34 as the center. When the buoyancy member 31 and the blocking member 35 move up and down, the upper and lower ends of the pawl 33 are respectively tightly attached to their upper and lower parts to ensure that they go straight up and down and do not escape.

[0116] A tension spring 38 is disposed at the lower end of the pawl 33, and the free end of the tension spring 38 is arranged on the inner side of the tube wall 32. When the blocking member 35 is seated, the tension spring 38 provides a supporting force and a balanced downward stabilizing force to the buoyancy member 31.

[0117] After the plugging member 35 and the tapered hole of the base 36 are seated and the leakage point of the inlet and outlet pipeline is handled, a harmless non-flammable medium such as water must be injected into the leaking pipe section to pressurize it, and reverse pressure must be applied to the lower end of the tapered hole of the base 36 to push the buoyancy member 31 and the plugging member 35 to the normal position before the operation can be resumed.

[0118] The volume of the buoyancy member 31 needs to be considered in combination with the deadweight of the buoyancy member 31 and the blocking member 35, the normal flow limit, and the action value of the buoyancy change caused by the vortex size when leakage occurs, and must match the timely downward movement when leakage occurs.

[0119] When the cut-off device body 3 cannot meet the normal flow requirement in the normal state, a cut-off device with a 37-mesh type (optional) can be used to meet the flow requirement. The vortex generated during leakage will also affect the buoyancy of the buoyancy member 31.

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

[0121] The ratchet claws 33 and the fulcrums 34 are evenly arranged on the inner side of the tube wall 32, and the number is 3 or more, so as to ensure that the buoyancy member 31 and the blocking member 35 are straight up and down.

[0122] The blocking member 35 may also be in a spherical shape or the like, so as to form a self-sealing effect when cut off.

[0123] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A drop-type leakage cut-off device, characterized in that: The invention comprises a tube wall (32), a buoyancy plugging member and a base (36), wherein the buoyancy plugging member is arranged at the top of the tube wall (32) and slides up and down along the inner wall of the tube wall (32); the base (36) is arranged at the bottom of the tube wall, and the base (36) is in close contact with the buoyancy plugging member when working.

2. A drop-type leakage cut-off device according to claim 1, characterized in that: The base (36) and the buoyancy blocking member are arranged concentrically.

3. A drop-type leakage cut-off device according to claim 1, characterized in that: The buoyancy plugging member comprises a buoyancy member (31) and a plugging member (35), wherein the buoyancy member (31) is installed on the top of the plugging member (35), and the bottom of the plugging member (35) cooperates with the base (36); the buoyancy member (31) and the plugging member (35) are arranged concentrically.

4. A drop-type leakage cut-off device according to claim 3, characterized in that: The blocking member (35) is of a conical structure, and a conical hole is formed at the upper end of the base (36), and the blocking member of the conical structure is assembled in the conical hole.

5. A drop-type leakage cut-off device according to claim 3, characterized in that: The blocking member (35) is a spherical structure, and a spherical hole is formed at the upper end of the base (36), and the blocking member with the spherical structure is assembled in the spherical hole.

6. A drop-type leakage cut-off device according to claim 3, characterized in that: The buoyancy member (31) and the blocking member (35) are detachably connected.

7. A drop-type leakage cut-off device according to claim 3, characterized in that: The buoyancy member (31) and the blocking member (35) are an integrated structure.

8. A drop-type leakage cut-off device according to claim 1, characterized in that: The tube wall (32) is provided with a limiting member for limiting the upward and downward sliding movement of the buoyancy blocking member.

9. A drop-type leakage cut-off device according to claim 8, characterized in that: The limiting member comprises a plurality of fulcrums (34), wherein the plurality of fulcrums (34) are evenly distributed on the inner side of the tube wall (32) along the circumferential direction; each fulcrum (34) is rotatably connected to a ratchet (33); and the two ends of each ratchet (33) are respectively contact-connected with the upper and lower ends of the buoyancy blocking member.

10. A drop-type leakage cut-off device according to claim 9, characterized in that: The fulcrum (34) is arranged concentrically with the buoyancy blocking member.

11. A drop-type leakage cut-off device according to claim 9, characterized in that: Each pawl (33) is connected to a tension spring (38), and the free end of the tension spring (38) is fixed on the inner side of the tube wall (32).

12. A drop-type leakage cut-off device according to claim 1, characterized in that: The tube wall (32) is provided with sieve holes arranged in a matrix, and the sieve holes are placed above the base.

13. An application of a drop-type leakage cut-off device, characterized in that: The cut-off device according to any one of claims 1 to 9 is installed at the pipe opening of the inlet and outlet pipelines between the bottom of the storage tank and the cut-off valve.

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