A multi-directional emergency disconnect self-sealing device and method of assembly and testing

Abstract

The present application relates to the technical field of aviation fuel system, and specifically designs a multidirectional emergency disconnecting self-sealing device and an assembling and testing method; the device is coaxially connected by an easy-to-break end assembly and a fixed end assembly; the easy-to-break end assembly comprises an easy-to-break end pipe joint, an easy-to-break end shell, an easy-to-break end valve seat assembly and a valve; the easy-to-break end pipe joint is fixed to the end of the easy-to-break end shell, the easy-to-break end valve seat assembly is arranged in the easy-to-break end shell and can slide in the axial direction, a valve is arranged on one side of the easy-to-break end valve seat assembly through a torsional spring, and the free end of the valve is lapped on a boss on the end face of the easy-to-break end shell; the fixed end assembly comprises a fixed end pipe joint, a fixed end valve seat, a stop ring, a fixed end shell and a fixed end valve; the design form of the fixed end assembly is equivalent to that of the easy-to-break end; springs are arranged between the easy-to-break end pipe joint and the valve seat and between the stop ring and the fixed end valve seat; under the action of the two springs, the end faces of the two valve seats are pressed and contact.

Description

Technical Field

[0001] This invention relates to the field of aviation fuel system technology, specifically to the field of self-sealing device technology, and more specifically, to a novel, highly safe and reliable multi-directional emergency disconnection self-sealing device and its assembly and inspection method. Background Technology

[0002] To enhance flight safety, emergency disconnect self-sealing devices are an essential component of aircraft engine firewalls. These products are widely used in aviation, come in various shapes and types. With the continuous increase in newly developed aircraft models in my country, the rising requirements for safety and reliability, and the refinement of airworthiness standards, increasingly stringent demands are being placed on the performance, safety, reliability, and environmental adaptability of the emergency disconnect self-sealing devices employed. These devices must possess radial and axial emergency disconnect capabilities, enabling rapid disconnection of pipelines in the event of significant engine displacement or detachment. Furthermore, both the fixed and breakable ends must be able to seal quickly to improve pilot survival rates in the event of a crash. Currently, existing self-sealing devices require long travel distances for both the fixed and breakable ends, which severely affects the seal at both ends, causing oil leaks and seriously impacting flight safety. Moreover, misalignment during the docking of the breakable end and the self-sealing end can affect the product's stability and reliability, failing to meet the requirements of newly developed aircraft models. Due to the limitations of the product structure, multiple internal parts need to be able to move in the axial direction. This makes them prone to movement under temperature, pressure and vibration conditions. As a result, the overlapping parts on both sides can move, causing the valve to close abnormally even if the self-sealing device is not broken, thus cutting off the engine fuel supply. Summary of the Invention

[0003] The purpose of this invention is to overcome the limitations of existing emergency disconnection self-sealing devices, which suffer from complex structures, long separation strokes, unstable docking processes, and restricted emergency disconnection directions. This invention designs a self-sealing device capable of both radial and axial emergency disconnection, incorporating end-face sealing and large-diameter design principles. Reliable sealing is achieved through the combined forces of spring force, torsion spring force, and valve weight. A axial emergency disconnection is achieved through a cleverly designed easily-broken end shell structure, while radial emergency disconnection is achieved through a rationally designed fixed end shell structure. The product is typically in a fully open state. By designing a shorter valve opening limit surface and limit length (1.4mm), stable flow during normal operation and rapid disconnection in emergencies can be effectively ensured. Furthermore, the limit position and limit surface are designed rationally.

[0004] A well-designed debugging device ensures that the sum of the overlap lengths on both sides can be directly measured during product installation. This guarantees that the tapping depth of the retaining ring during assembly is significantly less than the sum of the overlap lengths on both sides, preventing abnormal closure due to axial movement after installation. Additionally, a thicker adjusting shim is added behind the retaining ring to further ensure the product's post-installation condition. Furthermore, for assembled products (that cannot be disassembled), inspection fixtures are designed to allow for non-destructive testing of the product's overlaps in their final state, ensuring the product's installation condition and identifying the cause of any malfunctions.

[0005] Technical solution: The present invention proposes a multi-directional emergency disconnection self-sealing device, wherein the self-sealing device is formed by coaxially connecting a fragile end component and a fixed end component;

[0006] A fracturing end assembly includes a fracturing end pipe connector, a fracturing end housing, a fracturing end valve seat assembly, and a fracturing end valve. The fracturing end pipe connector is fixed to the end of the fracturing end housing. A boss is formed on the inner wall of the fracturing end pipe connector, which is flush with the end face of the fracturing end housing. The fracturing end valve seat assembly is disposed inside the fracturing end housing and can slide axially. The fracturing end valve is installed on one side of the fracturing end valve seat assembly by a torsion spring. The free end of the fracturing end valve overlaps the boss on the end face of the fracturing end housing.

[0007] A fixed-end assembly includes a fixed-end pipe connector, a fixed-end valve seat, a retaining ring, a fixed-end housing, and a fixed-end valve. The fixed-end pipe connector is fixed to the end of the fixed-end housing, and the fixed-end valve seat is disposed inside the fixed-end housing and can slide axially. The retaining ring is disposed between the fixed-end pipe connector and the fixed-end housing, and a boss is provided on the retaining ring. A fixed-end valve is installed on one side of the fixed-end valve seat assembly via a torsion spring, and the free end of the fixed-end valve overlaps the boss on the end face of the retaining ring.

[0008] A first spring is disposed between the easily broken end pipe joint and the easily broken end valve seat.

[0009] The second spring is disposed between the retaining ring and the fixed end valve seat; under the action of the two springs, the end faces of the two valve seats are pressed and contacted.

[0010] Furthermore, steel balls and steel wires are also provided between the housing of the easily broken end assembly and the fixed end valve seat of the fixed end assembly.

[0011] Furthermore, the easily broken end shell is a stepped cylindrical structure with an annular groove for installing steel balls on the outer surface and an annular notch for installing steel wires at the end of the larger diameter step.

[0012] Furthermore, two protrusions are symmetrically arranged at the end of the fixed end valve seat to reduce the contact area between the fixed end valve seat and the end face of the easily broken end valve seat, thereby improving the response speed.

[0013] Furthermore, a sealing groove is provided on the outer periphery of the middle part of the fixed end assembly housing, which, together with the protective ring and the sealing ring, achieves a seal between the device and the external environment.

[0014] This invention also proposes an assembly method for the aforementioned multi-directional emergency disconnect self-sealing device, which is achieved using a debugging fixture. The debugging fixture is a variable diameter rod, the smaller diameter section of which is equivalent to the inner diameter of the easily broken end component pipe joint, and the larger diameter section of which is equivalent to the inner diameter of the retaining ring and the valve seat. This is used to ensure that after the valve is lifted, the valve step is completely above the retaining ring / easily broken end pipe joint step. A boss is also provided on the larger diameter section, and the boss cooperates with the lug of the fixed end valve seat.

[0015] Step 1: Insert one end of the debugging fixture into the fixed end assembly of the self-sealing device to ensure that the valve overlaps on the retaining ring, and at the same time, the boss engages with the lug of the fixed end valve seat.

[0016] The second step is to insert the easily broken end component of the self-sealing device into the other end of the self-adjusting fixture to ensure that the valve is connected to the easily broken end pipe joint.

[0017] The third step is to press the fixed end component and the easily broken end component of the self-sealing device toward each other until they are in a limited position, and then insert the end of the steel wire into the hole in the housing of the fixed component to ensure that the two components do not separate.

[0018] Fourth step: Fix the entire assembly on the work platform, fix the debugging fixture, move the product upwards until it reaches the limit, and measure the height H1 of a certain plane M on the fixed end housing; move the product downwards until it reaches the limit, and measure the height H2 of the plane M on the fixed end housing; record the difference between the two heights △H, and use it as the sum of the overlap gaps of the two valves; if the value is within the design requirement range, remove the debugging fixture and assemble normally; if the value exceeds the design requirement range, calculate the value a that exceeds the design range, disassemble the above components, press the retaining ring inwards into a, and repeat the above steps.

[0019] The present invention also proposes an inspection method for the above-mentioned multi-directional emergency disconnection self-sealing device, and designs an inspection fixture, the inspection fixture including symmetrically arranged support plates and movable shafts;

[0020] The support plate consists of two symmetrically arranged support plates on either side of a cylinder, with the space in between fitting into the movable shaft. A boss is provided at one end. The two support plates pass through the self-sealing device from one end, with the boss embedded in the gap between the fixed-end valve seat and the easily broken valve seat. The movable shaft passes through the other end of the self-sealing device and presses the support plates outward to ensure they fit snugly against the inner wall of the self-sealing device. The movable shaft is then fixedly connected to the end of the support plate. During inspection, the movable shaft is pulled to concentrate the gaps on both sides of the self-sealing device to one side, and the valve on the other side is checked for detachment.

[0021] Beneficial technical effects of the present invention:

[0022] The self-sealing device specifically designed in this invention is a highly safe, reliable, and airtight multi-directional emergency disconnection self-sealing device. It overcomes the limitations of traditional self-sealing devices, which suffer from long disconnection times and restricted operation. The fixed-end housing is cleverly designed to achieve rapid axial emergency disconnection, while the easily broken end housing is rationally designed to achieve radial emergency disconnection. This dual radial and axial disconnection structure enhances system safety and expands the application range of the self-sealing device. Compared to the long disconnection stroke of traditional self-sealing devices, this novel structure introduces the design concept of torsion springs into the field of self-sealing devices, enabling rapid sealing at both ends after a short opening, thus reducing the occurrence of accidents. Furthermore, the force application points of the torsion springs are located on the valve seat and the valve respectively, unaffected by other structural elements, resulting in a stable and reliable structure. Since traditional self-sealing devices rely only on unidirectional sealing, designing a highly safe and reliable multi-directional emergency disconnection self-sealing device is essential.

[0023] Meanwhile, due to its multi-component assembly, the self-sealing device has stringent design requirements for installation and debugging. This invention also includes a rationally designed debugging device to ensure that the sum of the overlap lengths on both sides can be directly measured during installation. This ensures that the tapping depth of the retaining ring during assembly is such that the sum of the overlap lengths on both sides is much smaller than the overlap length on one side, preventing abnormal closure due to axial movement after installation. Additionally, a thick adjustment shim for tapping depth is added behind the retaining ring to further guarantee the product's post-installation condition. Furthermore, for assembled products (which cannot be disassembled), an inspection fixture is designed to ensure non-destructive testing of the gaps on both sides in the final state. When the gaps on both sides converge to one side, by checking whether the valve on the other side has detached and closed the oil circuit, the product's installation status can be accurately determined and the cause of product malfunction can be identified. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the easily broken valve seat assembly;

[0026] Figure 2 This is a schematic diagram of the structure of a fragile end valve assembly;

[0027] Figure 3 This is a schematic diagram of the structure of the easily broken end component;

[0028] Figure 4 This is a schematic diagram of the fixed-end valve seat assembly structure;

[0029] Figure 5 This is a schematic diagram of the fixed-end valve assembly structure;

[0030] Figure 6 This is a schematic diagram of the fixed-end component structure;

[0031] Figure 7 This is a schematic diagram of the self-sealing device of the present invention;

[0032] Figure 8 A schematic diagram of the debugging tooling structure;

[0033] Figure 9 For debugging schematic diagram;

[0034] Figure 10 To verify the tooling structure diagram;

[0035] Figure 11 To verify the schematic diagram.

[0036] Among them, 1-fracture-end valve seat vulcanized rubber; 2-fracture-end valve seat; 3-fracture-end valve seat assembly; 4-sealing gasket; 5-valve; 6-torsion spring; 7-pin; 8-fracture-end valve assembly; 9-spring; 10-fracture-end housing; 11-first sealing ring; 12-fracture-end pipe joint; 13-fixed end assembly; 14-fixed end valve seat; 15-fixed end valve seat vulcanized rubber; 16-fracture-end valve seat assembly; 17-fixed end valve assembly; 18-fixed end housing; 19-retaining ring; 20-fixed end pipe joint; 21, 22-adjusting shims; 23-fracture-end assembly; 24-steel ball; 25-steel wire; 26-second sealing ring; 27-protective ring; 28-third sealing ring; 29-elastic retaining ring; T1-adjustment fixture; J1-shaft; J2-support plate; J3-flat washer; J4-nut. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0039] Combination Figures 1-7 The self-sealing device of the present invention will be described in detail; see appendix. Figure 7 The present invention specifically designs a multi-directional emergency disconnect self-sealing device, wherein the self-sealing device is formed by coaxially connecting the easily broken end component 13 and the fixed end component 23;

[0040] See appendix Figure 3 The easily broken end assembly 13 includes an easily broken end pipe joint 12, an easily broken end housing 10, an easily broken end valve seat assembly 8, and a valve 5. The easily broken end pipe joint 12 is fixed to the end of the easily broken end housing 10. A boss is formed on the inner wall of the easily broken end pipe joint 12 that is flush with the end face of the easily broken end housing 10. The easily broken end valve seat assembly 8 is disposed inside the easily broken end housing 10 and can slide axially. The easily broken end valve 5 is installed on one side of the easily broken end valve seat assembly 8 through a torsion spring 6. The free end of the easily broken end valve 5 overlaps the boss on the inner wall of the easily broken end pipe joint 12.

[0041] See appendix Figure 6The fixed end assembly 23 includes a fixed end pipe connector 20, a fixed end valve seat 17, a retaining ring 19, a fixed end housing 18, and a valve 5. The fixed end pipe connector 20 is fixed to the end of the fixed end housing 18. The fixed end valve seat is disposed inside the fixed end housing and can slide axially. The retaining ring is disposed between the fixed end pipe connector and the fixed end housing. The retaining ring is provided with a boss. The fixed end valve is installed on one side of the fixed end valve seat assembly by a torsion spring. The free end of the fixed end valve overlaps the boss on the end face of the retaining ring.

[0042] Based on the above structural design, a spring 9 is also provided between the easily broken end pipe joint and the easily broken end valve seat, and a spring 5 is also provided between the retaining ring and the fixed end valve seat; under the action of the two springs, the end faces of the two valve seats are pressed and contacted.

[0043] The present invention also proposes an assembly method for the above-mentioned multi-directional emergency disconnection self-sealing device, the assembly process of which includes the following steps:

[0044] See Figure 8 , Figure 9 The adjustment is achieved using a debugging fixture, which is a variable diameter rod. Its smaller diameter section is equivalent to the inner diameter of the easily broken end component pipe joint, and its larger diameter section is equivalent to the inner diameter of the retaining ring and the valve seat. This is used to ensure that after the valve is lifted, the valve step is completely above the retaining ring / easily broken end pipe joint step. A boss is also provided on the larger diameter section, which cooperates with the lug of the fixed end valve seat.

[0045] Step 1: Insert one end of the debugging fixture into the fixed end assembly of the self-sealing device to ensure that the valve overlaps on the retaining ring, and at the same time, the boss engages with the lug of the fixed end valve seat.

[0046] The second step is to insert the easily broken end component of the self-sealing device into the other end of the self-adjusting fixture to ensure that the valve is connected to the easily broken end pipe joint.

[0047] The third step is to press the fixed end component and the easily broken end component of the self-sealing device toward each other until they are in a limited position, and then insert the end of the steel wire into the hole in the housing of the fixed component to ensure that the two components do not separate.

[0048] Fourth step: Fix the entire assembly on the work platform, fix the debugging fixture, move the product upwards until it reaches the limit, and measure the height H1 of a certain plane M on the fixed end housing; move the product downwards until it reaches the limit, and measure the height H2 of the plane M on the fixed end housing; record the difference between the two heights △H, and use it as the sum of the overlap gaps of the two valves; if the value is within the design requirement range, remove the debugging fixture and assemble normally; if the value exceeds the design requirement range, calculate the value a that exceeds the design range, disassemble the above components, press the retaining ring inwards into a, and repeat the above steps.

[0049] Since the multi-directional emergency disconnection self-sealing device designed in this invention is susceptible to self-sealing due to external environmental vibrations during transportation, or because regular inspection and maintenance are necessary during long-term use after the product is installed, this invention also proposes an inspection method for the aforementioned self-sealing device, including the following process:

[0050] See Figure 10 , Figure 11 Design an inspection fixture, which includes symmetrically arranged support plates and a movable shaft;

[0051] One end of the support plate is provided with a boss. Two support plates are inserted into the self-sealing device from one end of the self-sealing device. The boss is embedded in the lug of the easily broken valve seat of the self-sealing device. The movable shaft is inserted from the other end of the self-sealing device and presses the support plate outward to ensure that the support plate fits against the inner wall of the self-sealing device. The movable shaft is fixedly connected to the end of the support plate. During inspection, the movable shaft is pulled to concentrate the gap on both sides of the self-sealing device to one side and check whether the valve on the other side has fallen off.

[0052] The innovative design features of this invention are mainly reflected in the following aspects:

[0053] Core innovative design point 1: Weak links are designed on the fixed end housing and the easily broken end housing of the product. When the engine / fuel tank is greatly displaced or detached, causing excessive stress (axial or radial) on the connected fuel line, emergency disconnection and self-sealing of both ends can be achieved under the designed disconnection load, reducing the threat of fire and explosion caused by fuel leakage after the helicopter crashes.

[0054] Core innovative design point 2: After the product is disconnected in an emergency, the valve can be disengaged with only a short stroke, and the pipeline can be quickly sealed, reducing the amount of fuel leakage during the product breakage process and reducing the secondary hazards caused by fuel leakage;

[0055] Core innovative design point 3: Through the interference fit of the retaining ring and the support of the adjusting shims, the product is in a stable state when it is not disconnected, and is not affected by environmental factors such as vibration, pressure, and temperature, forming a stable and reliable large-diameter flow channel;

[0056] Core innovative design point 4: Design and debugging fixtures that can detect the overlap length on both sides of the product during the product assembly process, realize digital control, clearly understand the actual assembly status of the product, and ensure the reliability and stability of product assembly and debugging.

[0057] Core innovative design point 5: Design inspection fixtures that can check whether the overlap on both sides of the product is stable after product assembly, and whether the valve can be closed by pulling it open with external force, ensuring the reliability and stability of the product after assembly, and providing strong support for troubleshooting the root cause of faulty products.

[0058] Secondary innovative design point 1: A sealing groove and an installation groove are designed on the fixed end housing of the product. A protective ring and a sealing ring are installed in the sealing groove to achieve a seal with the oil tank. An elastic retaining ring is installed in the installation groove to limit the axial relative position between the product and the oil tank.

[0059] Secondary innovative design point 2: Installing vulcanized rubber for the easily broken valve on the easily broken valve seat improves the internal sealing performance of the product, and installing vulcanized rubber for the fixed valve on the fixed valve seat improves the internal sealing performance of the product. The shape design of the vulcanized rubber makes the sealing performance of the product more reliable.

[0060] Secondary innovative design point 3: Install sealing gaskets on the easily broken valve seat and the fixed valve seat respectively. After the product is broken, they form a soft-seal hard contact with the fixed end housing and the easily broken end housing to improve the sealing performance after the product breaks.

[0061] Secondary innovative design point 4: One end of the torsion spring is locked in the valve seat at the easily broken end or the valve seat at the fixed end to provide elastic support, while the other end controls the sealing force of the valve to ensure the product can quickly self-close and prevent oil leakage.

[0062] Secondary innovative design point 5: Protrusions are set on the easily broken pipe joints and retaining rings to provide support for the placement of the valves when the product is not in an emergency. Corresponding grooves are set on the valves. The cooperation between the protrusions and grooves provides strong stability for the product in non-emergency operation.

[0063] Secondary innovative design point 6: Setting a steel ball structure between the fixed end shell and the easily broken end shell can limit radial rotation;

[0064] Secondary innovative design point 7: Setting steel wires at the weak points of the fixed end shell and the easily broken end shell can restrict axial movement.

[0065] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should be considered within the protection scope of the present invention.

Claims

1. A multi-directional emergency disconnect self-sealing device, characterized in that, The self-sealing device is formed by coaxially connecting a breakable end component and a fixed end component; A fracturing end assembly includes a fracturing end pipe connector, a fracturing end housing, a fracturing end valve seat assembly, and a fracturing end valve. The fracturing end pipe connector is fixed to the end of the fracturing end housing. A boss is formed on the inner wall of the fracturing end pipe connector, which is flush with the end face of the fracturing end housing. The fracturing end valve seat assembly is disposed inside the fracturing end housing and can slide axially. The fracturing end valve is installed on one side of the fracturing end valve seat assembly via a torsion spring. The free end of the fracturing end valve overlaps the boss on the end face of the fracturing end housing. The fracturing end housing is a stepped cylindrical structure with an annular groove for installing a steel ball on the outer circular surface and an annular notch for installing a steel wire at the end of the larger diameter step. A fixed-end assembly includes a fixed-end pipe connector, a fixed-end valve seat, a retaining ring, a fixed-end housing, and a fixed-end valve. The fixed-end pipe connector is fixed to the end of the fixed-end housing. The fixed-end valve seat is disposed within the fixed-end housing and can slide axially. The retaining ring is disposed between the fixed-end pipe connector and the fixed-end housing, and has a boss. A fixed-end valve is mounted on one side of the fixed-end valve seat assembly via a torsion spring. The free end of the fixed-end valve overlaps the boss on the end face of the retaining ring. A steel ball and a steel wire are also disposed between the fragile end assembly housing and the fixed-end valve seat of the fixed-end assembly. Two bosses are symmetrically arranged at the end of the fixed-end valve seat to reduce the contact area between the end faces of the fixed-end valve seat and the fragile end valve seat. A first spring is disposed between the easily broken end pipe joint and the easily broken end valve seat. The second spring is disposed between the retaining ring and the fixed end valve seat; under the action of the two springs, the end faces of the two valve seats are pressed and contacted.

2. The multi-directional emergency disconnection self-sealing device as described in claim 1, characterized in that, A sealing groove is provided on the outer periphery of the middle part of the fixed end component housing, which, together with the protective ring and the sealing ring, achieves the sealing between the device and the external environment.

3. The multi-directional emergency disconnection self-sealing device as described in claim 1, characterized in that, The fragile end valve vulcanized rubber is installed on the fragile end valve seat, and the fixed end valve vulcanized rubber is installed on the fixed end valve seat. The shape design of the vulcanized rubber makes the sealing performance of the device more reliable.

4. The multi-directional emergency disconnection self-sealing device as described in claim 1, characterized in that, Sealing gaskets are installed on the fragile end valve seat and the fixed end valve seat respectively. After the self-sealing device is disconnected, they form a soft-seal hard contact with the fixed end housing and the fragile end housing to improve the sealing performance after the product breaks.

5. An assembly method for the multi-directional emergency disconnect self-sealing device as described in any one of claims 1 to 4, characterized in that, The adjustment is achieved using a variable diameter rod, the smaller diameter section of which is equivalent to the inner diameter of the easily broken end component pipe joint, and the larger diameter section is equivalent to the inner diameter of the retaining ring and the valve seat. This is used to ensure that after the valve is lifted, the valve step is completely above the retaining ring / easily broken end component pipe joint step. A boss is also provided on the larger diameter section, which cooperates with the lug of the fixed end valve seat. Step 1: Insert one end of the debugging fixture into the fixed end assembly of the self-sealing device to ensure that the valve overlaps on the retaining ring, and at the same time, the boss engages with the lug of the fixed end valve seat. The second step is to insert the easily broken end component of the self-sealing device into the other end of the self-adjusting fixture to ensure that the valve is connected to the easily broken end pipe joint. The third step is to press the fixed end component and the easily broken end component of the self-sealing device toward each other until they are in a limited position, and then insert the end of the steel wire into the hole in the housing of the fixed component to ensure that the two components do not separate. Fourth step: Fix the entire assembly on the work platform, fix the debugging fixture, move the product upwards until it reaches the limit, and measure the height H1 of a certain plane M on the fixed end housing; move the product downwards until it reaches the limit, and measure the height H2 of the plane M on the fixed end housing; record the difference between the two heights △H, and use it as the sum of the overlap gaps of the two valves; if the value is within the design requirement range, remove the debugging fixture and assemble normally; if the value exceeds the design requirement range, calculate the value a that exceeds the design range, disassemble the above components, press the retaining ring inwards into a, and repeat the above steps.

6. A test method for the multi-directional emergency disconnect self-sealing device as described in any one of claims 1 to 4, characterized in that, Design an inspection fixture, which includes symmetrically arranged support plates and a movable shaft; The support plate consists of two symmetrically arranged support plates on either side of a cylinder, with the space in between fitting into the movable shaft. A boss is provided at one end. The two support plates pass through the self-sealing device from one end, with the boss embedded in the gap between the fixed-end valve seat and the easily broken valve seat. The movable shaft passes through the other end of the self-sealing device and presses the support plates outward to ensure they fit snugly against the inner wall of the self-sealing device. The movable shaft is then fixedly connected to the end of the support plate. During inspection, the movable shaft is pulled to concentrate the gaps on both sides of the self-sealing device to one side, and the valve on the other side is checked for detachment.

7. The inspection method for a multi-directional emergency disconnect self-sealing device as described in claim 6, characterized in that, During the inspection process, the inspection fixture is inserted into the self-sealing device on the other side to test the reliability of the valve on the other side.

Images