Implosion protection device for hydraulic test of marine instrument

Abstract

The utility model discloses an implosion protection device for a hydrostatic test of an ocean instrument. The implosion protection device is composed of an external bearing assembly, an internal buffering assembly, an instrument fixing support and a buffering material layer. The external bearing assembly is a stainless steel cylinder with the inner diameter smaller than that of the pressure test chamber, a cylinder framework is formed by welding stainless steel pipes serving as keels, a plurality of small through holes are evenly punched in the circumferential direction and the axial direction of each stainless steel pipe, and the periphery, the upper portion and the bottom of the cylinder framework are each provided with a first stainless steel punched plate. The internal buffer assembly is a barrel made of a stainless steel bar as a keel, a layer of stainless steel punched plate II is arranged on the periphery and two ends of the barrel, and buffer material layers are arranged on the peripheral outer wall and two ends of the internal buffer assembly; the instrument fixing assembly is fixed in the internal buffer assembly and clamps and fixes the marine instrument to be tested. The shock absorber can effectively relieve energy of shock waves and reflect the shock waves, reduce pressure impact damage and protect test instruments; the device is high in deformation resistance and not easy to damage, the maintenance cost of the device is reduced, and the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of marine instrument environmental testing and detection, in particular to an implosion protection device for a marine instrument water pressure test. Background Art

[0002] Hydrostatic testing is a unique environmental test for marine instruments in the oceanographic field. It primarily examines whether marine instruments will deform, implode, or leak after being subjected to simulated pressure environments in deep-sea conditions. All submerged marine instruments undergo hydrostatic testing during the design, manufacturing, and factory acceptance processes to verify their ability to withstand the designed pressures and whether they leak under pressure. Hydrostatic testing often reveals implosions caused by improper structural design or substandard material composition. Marine instrument designers also proactively conduct hydrostatic implosion tests to determine the ultimate compressive strength of the instrument housing, facilitating subsequent design of a housing more suitable for the required operating depth. However, when an instrument implodes, the high-pressure water flow converges and collides with the center of the collapse. As the implosion continues, the pressure within the test chamber is converted into fluid kinetic energy, generating an implosion shock wave that can irreversibly damage other nearby marine instruments and the pressure test chamber. Numerous experiments have shown that implosion of marine instruments can lead to fragmentation or collapse, even producing significant amounts of test debris.

[0003] During a traditional hydrostatic test, the oceanographic instrument is simply fixed to a fixture bracket. The fixture bracket and the oceanographic instrument are then placed directly into the pressure test chamber. The sealing end cap is closed, and the high-pressure pump is turned on to begin the test. If an implosion occurs during the pressure increase, pressure maintenance, and pressure reduction process, the test is stopped and the sample is removed for inspection. However, this traditional test has the following disadvantages:

[0004] 1. Without any protective measures, the high pressure and fragment impact generated by the broken samples after the implosion will cause great damage to the high-pressure test system, such as micro-cracks in the bulkhead and dents in the cabin. In addition, the broken samples cannot be collected after the pressure is released and the debris is cleaned, which affects the designer's subsequent analysis of the product.

[0005] 2. The pressure shock and vibration generated after the sample implosion will also loosen the valves and pipelines of the high-pressure test system, causing high-pressure water to rapidly leak out from the gaps in the pipelines with high energy, directly affecting the personal safety of the test personnel.

[0006] 3. The tiny fragments generated after the sample implodes will block the pressure pipeline, causing the high-pressure test system to be unable to relieve pressure or increase pressure, causing safety problems and seriously affecting the test process.

[0007] 4. Marine instruments will also make a loud noise when they implode, especially when large-sized marine instruments implode under ultra-high pressure (above 20MPa) conditions, which will instantly produce high-decibel noise, seriously affecting the physical and mental health of the test personnel.

[0008] 5. After the sample implodes, it will cause damage to the test fixture bracket, such as fracture and deformation of the fixture bracket, which greatly increases the maintenance cost. The scrapping of the fixture bracket will cause huge waste. Re-processing a new test fixture bracket will affect the progress of subsequent tests and greatly reduce the test efficiency. Utility Model Content

[0009] In response to the problems existing in the prior art, the utility model provides an implosion protection device for water pressure testing of marine instruments, which fundamentally solves the various problems existing in traditional destructive water pressure testing, ensures the safety of the destructive water pressure testing process of marine instruments, and improves the instrument testing and analysis capabilities during the research and development of marine instruments in my country.

[0010] The utility model adopts the following technical solution to realize an implosion protection device for a marine instrument water pressure test, which is composed of an external load-bearing component, an internal buffer component, an instrument fixing bracket, and a buffer material layer;

[0011] The external load-bearing component is a stainless steel cylinder with a smaller inner diameter than the pressure test chamber. The cylindrical frame is welded with stainless steel tubes as keels. Each stainless steel tube is evenly perforated with multiple small through holes in the circumferential and axial directions. The cylindrical frame is wrapped with a layer of stainless steel punching plate on the periphery and bottom, and a removable stainless steel punching plate is provided on the top. The stainless steel punching plate is evenly distributed with small holes.

[0012] The internal buffer component is made of a barrel with a stainless steel bar as the keel, and a layer of stainless steel punching plate with small holes evenly distributed on the four sides and both ends of the barrel is wrapped. The stainless steel punching plate on the upper part of the barrel is detachable. The inner surface of the internal buffer component is sprayed with a polyurea coating, and a buffer material layer is provided on the outer wall around the internal buffer component. The end caps at both ends of the internal buffer component are covered with a buffer material layer with the same diameter as the end caps. After the buffer material layer is provided, the maximum outer diameter of the internal buffer component is equal to the inner diameter of the external load-bearing component, or slightly smaller than the inner diameter of the external load-bearing component, so that the internal buffer component is located inside the external load-bearing component and fits tightly with the external load-bearing component.

[0013] The instrument fixing bracket is located in the internal buffer assembly and is detachably fixed on the internal buffer assembly, and is used for clamping and fixing the ocean instrument to be tested.

[0014] Furthermore, the diameter of the small holes of the stainless steel punching plate is 8 mm to 10 mm.

[0015] Furthermore, the buffer material layer is high-hardness EVA cotton, and the high-hardness EVA cotton is fixed to the outer walls and end covers of the internal buffer component by rivets, bolts, or strong adhesive.

[0016] Furthermore, the external load-bearing component is made of 304 or 316L stainless steel.

[0017] Furthermore, the internal buffer component is made of 304 or 316L stainless steel.

[0018] Furthermore, the instrument fixing bracket includes two clamps and two fixing bolts. Each clamp is a Y-shaped structure, and one end of the clamp is provided with an external thread. The clamp passes through the small hole on the internal buffer component and is threadedly connected to the fixing bolt to fix it on the internal buffer component.

[0019] Further preferably, a ring-shaped high-hardness EVA cotton is provided between the two clamps and the ocean instrument to be tested.

[0020] The advantages and positive effects of the utility model are:

[0021] 1. The tested ocean instrument of the present invention adopts multi-layer protection, namely, external load-bearing components, internal buffer components, instrument fixing brackets, and buffer material layers (the buffer material layer can be thickened or thinned according to the size of the tested ocean instrument to ensure that the tested ocean instrument is located in the center of the device). It can effectively slow down the energy of shock waves and reflected shock waves, reduce the damage caused by pressure shock, and protect the test instrument; the multi-layer protection structure is combined together, has strong anti-deformation ability, is not easy to be damaged, greatly reduces the maintenance cost of the device, and improves the test efficiency.

[0022] 2. The instrument fixing bracket used when installing the tested ocean instrument of the utility model can keep the tested ocean instrument in a suspended state and as far away from the pressure test chamber wall as possible, avoiding being close to the pressure test chamber side wall, and reducing the direct contact damage of the shock wave to the high-pressure chamber body.

[0023] 3. The surface of the external load-bearing component and the internal buffer component of the utility model are equipped with a filter screen made of stainless steel punching plate, which can block the test debris in the implosion protection device and prevent it from flowing back to the pressure relief pipeline and valve with the test medium during pressure relief.

[0024] 4. The soft filling material of the present invention can be adjusted according to the inner cavity volume of the ocean instrument being tested, thereby reducing the space inside the instrument and reducing the damage impact while not changing the original support strength of the instrument and reducing test interference.

[0025] 5. The stainless steel mesh cage structure and the internal polyurea material spraying of the utility model can reduce the decibel of the sound when the tested ocean instrument implodes by more than 50%, which is beneficial to the physical and mental health of the test personnel.

[0026] 6. The polyurea coating sprayed on the internal buffer component of the present invention can effectively slow down the shock wave and effectively attenuate the energy of the reflected shock wave.

[0027] 7. The installation method of the oceanographic instrument to be tested of the present invention can effectively reduce the wear and tear between the oceanographic instrument to be tested and the bulkhead when the instrument is lowered into the pressure test chamber at the beginning of the test and when it is taken out of the test chamber after the test.

[0028] 8. The utility model can solve the problem of pressure shock to the test chamber when the marine instrument implodes during the water pressure test, the problem that the test instrument cannot be recovered and analyzed after being crushed, and the safety problem of instrument residue blocking the pipeline after destructive testing, ensuring the safety and reliability of the marine instrument implosion test process and effectively improving the efficiency of marine instrument research and development. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the specific implementation methods of the present invention, the following is a brief introduction to the drawings required for use in the description of the specific implementation methods. Obviously, the drawings described below are some specific implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic structural diagram of an implosion protection device for a marine instrument water pressure test according to an embodiment of the present invention;

[0031] Figure 2 A schematic cross-sectional view of the external support bracket provided in an embodiment of the present utility model;

[0032] Figure 3 A schematic structural diagram of an internal buffer bracket provided in an embodiment of the present utility model;

[0033] Figure 4 A schematic cross-sectional view of the internal buffer bracket provided by an embodiment of the present utility model;

[0034] Figure 5 A schematic structural diagram of an instrument fixing bracket provided in an embodiment of the present utility model;

[0035] Figure 6 This is a structural diagram of a pressure testing system provided in an embodiment of the present utility model.

[0036] Description of reference numerals:

[0037] 1. External load-bearing assembly; 1-1. Stainless steel tube; 1-1-1. Small through-hole; 1-2. Stainless steel perforated plate 1; 2. Internal buffer assembly; 2-1. Stainless steel bar; 2-2. Stainless steel perforated plate 2; 3. Instrument fixing bracket; 3-1. Clamp; 3-2. Fixing bolt; 4. Buffer material layer; 5. Pressure test chamber; 5-1. Sealing end cover; 6. Booster pump; 7. Marine instrument to be tested. DETAILED DESCRIPTION

[0038] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or locations, are based on the positions or locations shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "one," "two," and "three" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0041] See also Figures 1 to 6 This embodiment provides an implosion protection device for a marine instrument water pressure test, which is composed of an external bearing component 1, an internal buffer component 2, an instrument fixing bracket 3, and a buffer material layer 4.

[0042] The external load-bearing component 1 is a stainless steel cylinder that is 100 mm smaller than the inner diameter of the pressure test chamber. The cylindrical skeleton is welded by 8 stainless steel pipes 1-1 with a diameter of 100 mm as a keel. Each stainless steel pipe 1-1 is evenly punched with multiple small through holes 1-1-1 in the circumferential and axial directions to facilitate the flow of water in and out to balance the pressure; the cylindrical skeleton is wrapped with a layer of stainless steel punching plate 1-2 on all sides and the bottom, and a detachable stainless steel punching plate 1-2 is provided on the top as an end cover, and small holes are evenly distributed on the stainless steel punching plate 1-2.

[0043] The internal buffer component 2 is made of a stainless steel rod 2-1 as a keel to make a barrel, and the four sides and two ends of the barrel are wrapped with a layer of stainless steel punching plate 2-2 evenly distributed with small holes, which can timely drain and buffer the pressure, has low flow resistance, speeds up water entry during the test, and improves the test efficiency; the stainless steel punching plate mesh surface is flat and smooth, and is not easy to scratch the sample; the inner surface of the internal buffer component 2 is sprayed with a polyurea coating, which effectively reduces the impact of the implosion and improves the utilization rate of the device; a buffer material layer 4 is set on the outer wall around the internal buffer component 2, and the end covers at both ends of the internal buffer component 2 are covered with a buffer material layer 4 with the same diameter as the end cover in the same way; after the buffer material layer 4 is set, the maximum outer diameter of the internal buffer component 2 is equal to the inner diameter of the external load-bearing component 1, or slightly smaller than the inner diameter of the external load-bearing component 1, so that the internal buffer component 2 is located in the external load-bearing component 1 and fits tightly with the external load-bearing component 1.

[0044] The instrument fixing bracket 3 is located in the internal buffer component 2 and is detachably fixed on the internal buffer component 2 to clamp and fix the ocean instrument 7 to be tested.

[0045] As a preferred embodiment, the perforated stainless steel plates 1-2 and 2-2 have apertures of 8mm to 10mm in diameter, respectively. This allows for timely drainage and pressure buffering, reduces flow resistance, accelerates water entry during testing, and improves test efficiency. The perforated stainless steel plates have a smooth mesh surface that is less likely to scratch the sample. The perforated stainless steel plates effectively prevent the loss of small sample fragments after collapse, allowing for collection of sample fragments for later experimental analysis.

[0046] As a preferred embodiment, the buffer material layer 4 is high-hardness EVA cotton, which is fixed in a ring shape on the four outer walls of the internal buffer component 2 and in a circular shape on the end covers of the internal buffer component 2 by rivets, bolts, or strong glue. The high-hardness EVA cotton has a small deformation and low water absorption rate under water pressure conditions, and is suitable as a buffer material.

[0047] As a preferred embodiment, the external load-bearing component 1 is made of 304 or 316L stainless steel to ensure the strength of the external load-bearing component 1.

[0048] As a preferred embodiment, the internal buffer component 2 is made of 304 or 316L stainless steel to ensure the strength of the internal buffer component 2.

[0049] As a preferred embodiment, the instrument fixing bracket 3 includes two clamps 3-1 and two fixing bolts 3-2. Each of the clamps 3-1 is a Y-shaped structure, and one end of the clamp 3-1 is provided with an external thread. The clamp 3-1 passes through the small hole on the internal buffer component 2 and is threadedly connected to the fixing bolt 3-2, so that it can be firmly fixed on the internal buffer component 2.

[0050] As a preferred embodiment, a circular high-hardness EVA cotton is provided between the two clamps 3 - 1 and the ocean instrument 7 to be tested, so as to prevent the clamps from damaging the ocean instrument 7 to be tested.

[0051] The test method of the marine instrument water pressure test includes the following steps:

[0052] 1) Measure the inner volume of the oceanographic instrument 7 to be tested, and fill the inner volume of the oceanographic instrument 7 with a water bottle, wooden strips, or soft filling material such as cushioning foam, which accounts for 60% to 70% of the inner volume of the oceanographic instrument 7. The soft filling material should not be in close contact with the inner volume of the oceanographic instrument 7 to be tested;

[0053] 2) The oceanographic instrument to be tested 7 is securely installed in the internal buffer assembly 2 together with the circular high-hardness EVA cotton and the instrument fixing bracket 3; wherein, the internal buffer assembly 2 is filled with circular high-hardness EVA cotton of different thicknesses at the bottom layer by layer according to the height of the oceanographic instrument to be tested 7, and the oceanographic instrument to be tested 7 is positioned in the middle of the internal buffer assembly 2 as much as possible to avoid contact with the side walls, and then covered with the EVA hollow circular plate, and the barrel lid is locked;

[0054] 3) The inner buffer assembly 2, on which the oceanographic instrument 7 to be tested is mounted, is provided with a buffer material layer 4 on its outer walls and end caps. The inner buffer assembly 2 is then placed in the middle of the outer support assembly 1 and the cylindrical end caps are closed to obtain the oceanographic instrument 7 to be tested equipped with an implosion protection device.

[0055] 4) Then, use an overhead crane to hoist the entire marine instrument 7 equipped with the implosion protection device into the pressure test chamber 5, ensuring that it does not come into contact with the inner wall of the pressure test chamber 5. Install the sealing end cover 5-1 on the pressure test chamber 5 to seal the pressure test chamber 5;

[0056] 5) Begin the hydrostatic test by turning on the booster pump 6 and slowly increasing the pressure at a rate not exceeding 2 MPa / min until the pressure reaches the theoretical ultimate pressure of the tested oceanographic instrument, and maintain the pressure for 30 minutes. If the tested oceanographic instrument does not fail, continue increasing the pressure by a gradient of 5% or 10% of the designed theoretical ultimate pressure, maintaining the pressure for 5 minutes at each stage, until the tested oceanographic instrument implodes;

[0057] 6) Open the pressure relief valve and reduce the pressure in the pressure test chamber 5 to 0. After eliminating the residual pressure, take out the tested oceanographic instrument after the implosion for analysis and inspection.

[0058] The utility model can solve the problem of pressure shock to the test chamber when the marine instrument implodes during the water pressure test, the problem of the test instrument being unable to be recovered and analyzed after being crushed, and the safety problem of instrument residue blocking the pipeline after destructive testing, thereby ensuring the safety and reliability of the marine instrument implosion test process and effectively improving the efficiency of marine instrument research and development.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A marine instrument water pressure test implosion protection device, characterized in that: It consists of external load-bearing components, internal buffer components, instrument fixing brackets, and buffer material layers; The external load-bearing component is a stainless steel cylinder with a smaller inner diameter than the pressure test chamber. The cylindrical frame is welded with stainless steel tubes as keels. Each stainless steel tube is evenly perforated with multiple small through holes in the circumferential and axial directions. The cylindrical frame is wrapped with a layer of stainless steel punching plate on the periphery and bottom, and a removable stainless steel punching plate is provided on the top. The stainless steel punching plate is evenly distributed with small holes. The internal buffer component is made of a barrel with a stainless steel bar as the keel, and a layer of stainless steel punching plate with small holes evenly distributed on the four sides and both ends of the barrel is wrapped. The stainless steel punching plate on the upper part of the barrel is detachable. The inner surface of the internal buffer component is sprayed with a polyurea coating, and a buffer material layer is provided on the outer wall around the internal buffer component. The end caps at both ends of the internal buffer component are covered with a buffer material layer with the same diameter as the end caps. After the buffer material layer is provided, the maximum outer diameter of the internal buffer component is equal to the inner diameter of the external load-bearing component, or slightly smaller than the inner diameter of the external load-bearing component, so that the internal buffer component is located inside the external load-bearing component and fits tightly with the external load-bearing component. The instrument fixing assembly is located in the internal buffer assembly and is detachably fixed on the internal buffer assembly, and is used to clamp and fix the ocean instrument to be tested.

2. The marine instrument water pressure test implosion protection device according to claim 1, characterized in that: The diameter of the small holes of the stainless steel punching plate is 8mm to 10mm.

3. The marine instrument water pressure test implosion protection device according to claim 1, characterized in that: The buffer material layer is high-hardness EVA cotton, which is fixed to the surrounding outer walls and end covers of the internal buffer component by rivets, bolts, or strong adhesive.

4. The marine instrument water pressure test implosion protection device according to claim 1, characterized in that: The external load-bearing component is made of 304 or 316L stainless steel.

5. The marine instrument water pressure test implosion protection device according to claim 1, characterized in that: The internal buffer component is made of 304 or 316L stainless steel.

6. The marine instrument water pressure test implosion protection device according to claim 1, characterized in that: The instrument fixing bracket includes two clamps and two fixing bolts. Each clamp is a Y-shaped structure. One end of the clamp is provided with an external thread. The clamp passes through the small hole on the internal buffer component and is threadedly connected to the fixing bolt to fix it on the internal buffer component.

7. The marine instrument water pressure test implosion protection device according to claim 6, characterized in that: A circular high-hardness EVA cotton is provided between the two clamps and the ocean instrument to be tested.

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