Rapid sealing method for measuring lead joint in water pressure test of deep sea equipment

Abstract

The invention relates to a rapid sealing method for a deep sea equipment hydrostatic test measuring wire joint, and the method comprises the following steps: 1, selecting a sealing region, and sealing the sealing region; the sealing area comprises a metal section formed after the external metal core is connected and further comprises an outer skin head section adjacent to the external metal core, the length of the metal section is L1, and the length of the outer skin head section is L2; step 2, cleaning the surface of the sealing area; step 3, cutting out a rubber-based pressure-sensitive adhesive tape with a proper length, and wrapping the rubber-based pressure-sensitive adhesive tape outside the sealing area; and 4, the rubber-based pressure-sensitive adhesive tape is tightly attached to the outer surface of the sealing area in an extrusion mode, so that the sealing operation of the wire connector can be conducted on an operation site, the method is simple, the cost is low, and the good sealing performance is achieved.

Description

Technical Field

[0001] The invention relates to the field of experiment and testing technology, in particular to a rapid sealing method for a measuring wire joint of a water pressure test of deep-sea equipment. Background Art

[0002] During the development of new pressure-resistant structures for deep-sea equipment, extensive hydrostatic testing of structural models at scale or full scale is typically conducted within a pressure cylinder. Strain and deformation measurements are also performed on typical and critical parts of the pressure-resistant structure to understand and assess its structural response to water pressure. Electrical measurement methods based on sensors such as strain gauges are commonly used during hydrostatic testing. During pressure cylinder testing, numerous joints connect the measuring leads to the strain gauge sensor leads and the lead wires of the penetration connector. Because electrical measurement methods place extremely high demands on the insulation resistance of the measuring leads, the waterproof seal quality of these joints is crucial to the hydrostatic test results.

[0003] To ensure waterproof sealing, cable joints related to deep-sea equipment products are sealed by vulcanization treatment using specialized equipment and materials. The material is melted and solidified to form a structure that is integrated with the original insulating sheath. The vulcanization method has the advantages of good sealing, stable performance, and aging resistance. Vulcanization treatment not only requires professional equipment and technicians, but the vulcanization process also has extremely strict control requirements for temperature, pressure, and time parameters. The operation is complex, the operation time is long, and the cost is high. Each water pressure test of the pressure-resistant structure of deep-sea equipment involves hundreds or even thousands of measuring wire joints, and these measuring wires are often disposable test consumables. Therefore, from the perspective of test cost, time, and on-site operation convenience, the sealing of measuring wire joints should not be done by vulcanization. It is necessary to find a simple, low-cost, and effective rapid sealing method. Summary of the Invention

[0004] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a rapid sealing method for measuring wire joints of deep-sea equipment water pressure test, so that the sealing operation of the measuring wire joints can be carried out at the operation site. The method is simple, low-cost, and has good sealing performance.

[0005] The technical solutions adopted in the present invention are as follows:

[0006] A rapid sealing method for a measuring wire joint for a hydrostatic test of deep-sea equipment is provided. The measuring wire joint is formed by connecting an external metal core located at the ends of a first wire and a second wire and exposed outside an insulating outer sheath. The sealing method comprises the following steps:

[0007] Step 1: Select a sealing area. The sealing area includes a metal segment formed by connecting the outer metal core and an outer skin head segment adjacent to the outer metal core. The length of the metal segment is L1, and the length of the outer skin head segment is L2.

[0008] Step 2: Clean the surface of the sealing area;

[0009] Step 3: Cut a rubber-based pressure-sensitive tape of appropriate length and wrap the rubber-based pressure-sensitive tape around the outside of the sealing area;

[0010] Step 4: The rubber-based pressure-sensitive tape is tightly fitted to the outer surface of the sealing area by extrusion.

[0011] As a further improvement of the above technical solution:

[0012] L2≤L1≤2×L2.

[0013] In step 4, after extrusion, the outer surface shape of the rubber-based pressure-sensitive adhesive tape is adjusted by kneading it by hand so that the thickness of the rubber-based pressure-sensitive adhesive tape on the same cross section is relatively uniform.

[0014] In step 4, the thickness of the rubber-based pressure-sensitive adhesive tape adjusted by kneading is gradually reduced along the length direction of the wire from the middle to the two ends of the sealing area.

[0015] The rubber-based pressure-sensitive tape is SB tape.

[0016] The sealing method further comprises a fifth step of evenly applying liquid silicone rubber adhesive on the surface of the rubber-based pressure-sensitive adhesive tape, and then allowing the liquid silicone rubber adhesive to stand to solidify.

[0017] In step five, the silicone rubber adhesive is wrapped around the surface of the rubber-based pressure-sensitive tape and is in uniform sealing contact with the outer periphery of the insulating sheath.

[0018] In step five, the liquid silicone rubber adhesive is applied to a thickness of 0.5 mm to 2 mm.

[0019] The liquid silicone rubber adhesive is 703 glue.

[0020] The two outer metal cores are connected by welding to form a metal connection body at the welding position, and the surface of the metal connection body is smooth.

[0021] The beneficial effects of the present invention are as follows:

[0022] The present invention has a compact and reasonable structure and is easy to operate. By selecting the area near the measuring wire joint as the sealing area, the metal part and the non-metal part are wrapped as a whole by utilizing the good adhesion and waterproof properties of the rubber-based pressure-sensitive adhesive tape. Under the action of external force, the rubber-based pressure-sensitive adhesive tape is in good contact with the sealing area and sealed. The rubber-based pressure-sensitive adhesive tape and the insulating outer skins at both ends of the sealing area form an integrated sealing structure, thereby improving the sealing operation efficiency of the measuring wire joint and reducing the sealing cost. The sealing operation of the measuring wire joint can be carried out at the test site.

[0023] At the same time, the present invention also has the following advantages:

[0024] (1) The length of the metal segment in the sealing area is L1, and the length of the outer sheath segment is L2, L2≤L1≤2×L2. The rubber-based pressure-sensitive adhesive tape has a certain contact length with the insulating outer sheath, so that the rubber-based pressure-sensitive adhesive tape has a certain distance to block water and metal, thereby improving the waterproofness and pressure resistance.

[0025] (2) Ensure the thickness of the rubber-based pressure-sensitive tape on the same cross section to match the special-shaped structure of the measuring wire connector to ensure the strength of the rubber-based pressure-sensitive tape.

[0026] (3) The edge of the rubber-based pressure-sensitive adhesive tape and the connection portion of the insulation sheath have a smooth transition, so that the overall elastic performance of the rubber-based pressure-sensitive adhesive tape along the length direction of the conductor is better after molding.

[0027] (4) By utilizing the liquid properties of liquid silicone rubber adhesive and its characteristics after curing, it is applied to the outside of the rubber-based pressure-sensitive tape and is in uniform sealing contact with the outer periphery of the insulating outer skin. This can maintain the shape of the seal while achieving auxiliary sealing. It comprehensively utilizes the viscosity, waterproofness and flexibility of the rubber-based pressure-sensitive tape and silicone rubber adhesive, making the sealing method simple, quick and reliable to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] Figure 2 Schematic diagram of the structure of the conductor of the present invention.

[0030] Figure 3 This is a schematic diagram of the measuring wire connection process of the present invention.

[0031] Figure 4 This is a schematic diagram of the sealing process of the measuring wire joint of the present invention.

[0032] Figure 5 This is a flow chart of the sealing process of the present invention.

[0033] Wherein: 1. first conductor; 2. second conductor; 3. insulating outer sheath; 4. outer metal core; 5. metal connector; 6. rubber-based pressure-sensitive adhesive tape; 7. silicone rubber adhesive. DETAILED DESCRIPTION

[0034] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0035] Example 1:

[0036] like Figure 1-Figure 4As shown, in this embodiment, a rapid sealing method for a measuring conductor joint for a hydrostatic test of deep-sea equipment is provided. After the outer metal core 4 located at the ends of the first conductor 1 and the second conductor 2 and exposed outside the insulating sheath 3 is connected, the measuring conductor joint is formed. The sealing method includes the following steps:

[0037] Step 1: Select a sealing area. The sealing area includes the metal segment formed by connecting the outer metal core 4 and the outer skin head segment adjacent to the outer metal core 4. The length of the metal segment is L1, and the length of the outer skin head segment is L2.

[0038] Step 2: Clean the surface of the sealing area;

[0039] Step 3: Cut a rubber-based pressure-sensitive adhesive tape 6 of appropriate length and wrap the rubber-based pressure-sensitive adhesive tape 6 around the outside of the sealing area;

[0040] Step 4: The rubber-based pressure-sensitive adhesive tape 6 is tightly fitted to the outer surface of the sealing area by extrusion.

[0041] like Figure 1 、 Figure 2 As shown, the first conductor 1 is the measuring conductor connecting to the sensor, and the second conductor 2 is the sensor lead. In typical hydrostatic tests, commonly used measuring conductors are multi-core, with an outer insulating sheath 3 made of polyvinyl chloride and an outer metal core 4 made of sixteen copper wires. Sensor leads such as strain gauges also typically have a single-core structure with an outer metal core 4 encased in an insulating sheath 3.

[0042] The purpose of cleaning the surface of the sealing area may include removing moisture, grease, scale, rust, etc., and providing a smooth surface so that the rubber-based pressure-sensitive adhesive tape 6 can better fit the sealing area.

[0043] The rubber-based pressure-sensitive tape 6 is a double-sided tape with multifunctional adhesion. It can adhere to various substrates such as steel structure surfaces, non-metals, etc. to form a waterproof bond. It is usually used to stick and fix sensors, such as strain gauges.

[0044] Squeezing the rubber-based pressure-sensitive adhesive tape 6 can expel the air between the rubber-based pressure-sensitive adhesive tape 6 and the sealing area, and make the rubber-based pressure-sensitive adhesive tape 6 and the sealing area adhere well. In step 4, the squeezing operation can be performed manually.

[0045] After step four is completed, the maximum thickness of the rubber-based pressure-sensitive adhesive tape 6 wrapped around the outer sheath section of the first conductor 1 is greater than or equal to half the diameter of the first conductor 1, and the maximum thickness of the rubber-based pressure-sensitive adhesive tape 6 wrapped around the outer sheath section of the second conductor 2 is greater than or equal to half the diameter of the second conductor 2, ensuring the strength of the rubber-based pressure-sensitive adhesive tape 6.

[0046] The area near the measuring wire joint is selected as the sealing area, and the good adhesion and waterproof properties of the rubber-based pressure-sensitive adhesive tape 6 are used to wrap the metal part and the non-metal part as a whole. Under the action of external force, the rubber-based pressure-sensitive adhesive tape 6 is in good contact with the sealing area and sealed. The rubber-based pressure-sensitive adhesive tape 6 and the insulating outer skin 3 at both ends of the sealing area form an integrated sealing structure, which improves the sealing operation efficiency of the measuring wire joint and reduces the sealing cost. The sealing operation of the measuring wire joint can be carried out at the test site.

[0047] Furthermore, L2≤L1≤2×L2. The rubber-based pressure-sensitive adhesive tape 6 has a certain contact length with the insulating sheath 3, so that the rubber-based pressure-sensitive adhesive tape 6 has a certain distance to block water and metal, thereby improving the waterproofness and pressure resistance.

[0048] Example 2:

[0049] Step 1: Select a sealing area. The sealing area includes a metal segment formed by connecting the outer metal core 4 and an outer skin head segment adjacent to the outer metal core 4. The length of the metal segment is L1, and the length of the outer skin head segment is L2.

[0050] Step 2: Clean the surface of the sealing area.

[0051] Step 3: Cut a rubber-based pressure-sensitive adhesive tape 6 of appropriate length and wrap the rubber-based pressure-sensitive adhesive tape 6 around the outside of the sealing area.

[0052] Step 4: The rubber-based pressure-sensitive adhesive tape 6 is tightly fitted to the outer surface of the sealing area by extrusion;

[0053] After squeezing, the outer surface shape of the rubber-based pressure-sensitive adhesive tape 6 is adjusted by kneading it by hand so that the thickness of the rubber-based pressure-sensitive adhesive tape 6 on the same cross section is relatively uniform;

[0054] The thickness of the rubber-based pressure-sensitive adhesive tape 6 after kneading and adjustment along the length direction of the wire gradually decreases from the middle to the two ends of the sealing area.

[0055] In step 4, due to the special shape of the measuring wire joint, such as Figure 4 In the embodiment, the first conductor 1 and the second conductor 2 have a certain radial misalignment after connection, and the operator needs to adjust the shape of the rubber-based pressure-sensitive adhesive tape 6 to ensure the thickness of the rubber-based pressure-sensitive adhesive tape 6 on the same cross section to match the special-shaped structure of the measuring wire joint and ensure the strength of the rubber-based pressure-sensitive adhesive tape 6.

[0056] In step 4, the thickness of the rubber-based pressure-sensitive adhesive tape 6 along the length direction of the conductor is adjusted to make the edge of the rubber-based pressure-sensitive adhesive tape 6 and the connecting portion of the insulating sheath 3 have a smooth transition, so that the overall elastic performance of the rubber-based pressure-sensitive adhesive tape 6 along the length direction of the conductor is better after molding. Figure 4 shown.

[0057] In step 4, since the outer surface of the rubber-based pressure-sensitive adhesive tape 6 is highly sticky, it is necessary to separate the hand and the rubber-based pressure-sensitive adhesive tape 6 with release paper before performing the squeezing and kneading operations.

[0058] The rubber-based pressure-sensitive adhesive tape 6 is an SB tape, and the rubber is butyl rubber.

[0059] The SB tape used in this example is manufactured by Tokyo Mekuki Co., Ltd. (TML) in Japan. The model number is SB TAPE, and the specifications are 10mm × 3mm × 5mm. When used, it is cut into small strips of a certain length, which can be called SB tape. SB tape has strong plasticity, making it easier to knead and shape, and has a certain degree of elasticity and flexibility after curing.

[0060] By utilizing the strong adhesion, waterproofness and plasticity of SB tape, the metal and non-metallic parts of the measuring guide joint can be sealed and wrapped by manually squeezing and kneading.

[0061] Example 3:

[0062] Based on the above embodiment, the rapid sealing method for a deep-sea equipment water pressure test measuring wire joint of this embodiment further includes the following steps:

[0063] Step 5: Apply liquid silicone rubber adhesive 7 evenly on the surface of the rubber-based pressure-sensitive adhesive tape 6, and then let it stand to solidify the silicone rubber adhesive 7. The silicone rubber adhesive 7 solidifies on the outer surface of the rubber-based pressure-sensitive adhesive tape 6 to maintain the shape of the rubber-based pressure-sensitive adhesive tape 6, such as Figure 4 shown.

[0064] In step five, silicone rubber adhesive 7 is wrapped around the surface of the rubber-based pressure-sensitive tape 6 and is in uniform, sealed contact with the outer periphery of the insulating sheath 3. The silicone rubber adhesive 7 is cured and formed on the outer surface of the silicone rubber adhesive 7 and connected to the insulating sheath 3, forming another sealing structure outside the silicone rubber adhesive 7, thereby improving the sealing effect of the measuring wire joint.

[0065] In step 5, the liquid silicone rubber adhesive 7 is applied to a thickness of 0.5 mm to 2 mm to ensure the strength of the silicone rubber adhesive 7 after curing.

[0066] The liquid silicone rubber adhesive 7 is 703 glue.

[0067] Because silicone rubber adhesives like 703 glue are viscous, ensure a consistent layer thickness when applying them. Avoid excessive application, which could affect the curing time, and avoid excessive application, which could cause the glue to run. After application, allow the glue to cure naturally. Cured 703 glue maintains elasticity. 703 glue can be replaced with similar viscous liquid silicone rubbers like 704 glue and 705 glue.

[0068] By utilizing the liquid properties of the liquid silicone rubber adhesive 7 and its characteristics after curing, it is applied to the outside of the rubber-based pressure-sensitive tape 6 and is in uniform sealing contact with the outer periphery of the insulating outer skin 3, which can maintain the shape of the sealing part while achieving auxiliary sealing. The viscosity, waterproofness and flexibility of the rubber-based pressure-sensitive tape 6 and the silicone rubber adhesive 7 are comprehensively utilized, making the sealing method simple, quick and reliable to operate.

[0069] The insulation resistance of the measuring guide joint sealed by the rapid sealing method for the deep-sea equipment water pressure test measuring wire joint of this embodiment is greater than 100MΩ, which can meet the high-voltage test requirements, and the waterproof seal can also meet the waterproof sealing performance requirements of the high water pressure environment required for the test.

[0070] In the rapid sealing method for a deep-sea equipment hydrostatic test measuring conductor joint of this embodiment, two outer metal cores 4 are connected by welding, forming a metal connector 5 at the welded portion. The metal connector 5 has a smooth surface, ensuring the wrapping effect of the rubber-based pressure-sensitive adhesive tape 6.

[0071] The outer metal core 4 is usually welded with solder. The ends of the first wire 1 and the second wire 2 are exposed outside the insulating sheath 3. The outer metal core 4 is tinned before welding, and then welded. Figure 3 shown.

[0072] The rapid sealing method for the deep-sea equipment water pressure test measuring wire joint of this embodiment fully explores and utilizes the sealing properties of SB tape and 703 glue, clarifies the specific process flow and method of the combined sealing of the two glues, is simple to operate, convenient and fast, and can adapt to different operating environments such as laboratories and field tests; a large number of practical applications of water pressure tests have proved that the sealing quality of the measuring wire joint using this sealing method is firm and reliable, which effectively improves the sealing efficiency of the test measuring wire joint and ensures the correctness and effectiveness of the test measurement results.

[0073] Specific sealing process flow such as Figure 5 As shown:

[0074] First, prepare the corresponding measuring wire according to the measurement requirements, laying path, etc. The measuring wire and the sensor lead are connected and fixed with solder. The corresponding external metal core 4 needs to be tinned before connection. The solder shape of the butt joint should be smooth and not sharp. Figure 3 .

[0075] Before using the rubber-based pressure-sensitive tape 6 (SB tape) for sealing, first clean the surface of the sealing area between the measuring wire and the sensor lead, then cut the SB tape of appropriate length and width to wrap the sealing area, and squeeze it to make the SB tape fit tightly with the metal layer and insulating outer skin 3 of the sealing area. Finally, adjust the size and shape of the sealing area by kneading, as shown in the figure. Figure 4 .

[0076] Use silicone rubber adhesive 7 (703 glue) to evenly apply and completely cover the surface of the SB tape. Since 703 glue is viscous, it is necessary to ensure that the 703 glue layer has a certain thickness when applying it, and avoid applying too much to cause the 703 glue to flow. Figure 4 After applying, let it stand and solidify naturally.

[0077] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. A rapid sealing method for a deep-sea equipment hydrostatic test measuring conductor joint, characterized by: The external metal core (4) located at the ends of the first wire (1) and the second wire (2) and exposed outside the insulating outer skin (3) is connected to form the measuring wire joint, and the sealing method includes the following steps: Step 1: Select a sealing area, the sealing area including a metal segment formed by connecting the outer metal core (4) and an outer skin head segment adjacent to the outer metal core (4), the length of the metal segment being L1, and the length of the outer skin head segment being L2; Step 2: Clean the surface of the sealing area; Step 3: Cut a rubber-based pressure-sensitive adhesive tape (6) of appropriate length and wrap the rubber-based pressure-sensitive adhesive tape (6) around the outside of the sealing area; Step 4: The rubber-based pressure-sensitive adhesive tape (6) is tightly fitted to the outer surface of the sealing area by extrusion.

2. The rapid sealing method for a deep-sea equipment hydrostatic test measuring conductor joint according to claim 1, characterized in that: L2≤L1≤2×L2.

3. The rapid sealing method for a deep-sea equipment water pressure test measuring wire joint according to claim 1, characterized in that: In step 4, after extrusion, the outer surface shape of the rubber-based pressure-sensitive adhesive tape (6) is adjusted by kneading by hand so that the thickness of the rubber-based pressure-sensitive adhesive tape (6) on the same cross section is relatively uniform.

4. The rapid sealing method for a deep-sea equipment hydrostatic test measuring conductor joint according to claim 3, characterized in that: In step 4, the thickness of the rubber-based pressure-sensitive adhesive tape (6) after kneading and adjustment along the length direction of the wire gradually decreases from the middle to the two ends of the sealing area.

5. The rapid sealing method for a deep-sea equipment water pressure test measuring wire joint according to claim 1, characterized in that: The rubber-based pressure-sensitive adhesive tape (6) is an SB tape.

6. The rapid sealing method for a deep-sea equipment water pressure test measuring wire joint according to claim 1, characterized in that: The sealing method further comprises step five, uniformly applying liquid silicone rubber adhesive (7) on the surface of the rubber-based pressure-sensitive adhesive tape (6), and then allowing the silicone rubber adhesive (7) to stand to solidify.

7. The rapid sealing method for a deep-sea equipment water pressure test measuring wire joint according to claim 6, characterized in that: In step five, the silicone rubber adhesive (7) is wrapped around the surface of the rubber-based pressure-sensitive tape (6) and is in uniform sealing contact with the outer periphery of the insulating sheath (3).

8. The rapid sealing method for a deep-sea equipment water pressure test measuring wire joint according to claim 6, characterized in that: In step five, the liquid silicone rubber adhesive (7) is applied to a thickness of 0.5 mm to 2 mm.

9. The rapid sealing method for a deep-sea equipment water pressure test measuring wire joint according to claim 6, characterized in that: The liquid silicone rubber adhesive (7) is 703 glue.

10. The rapid sealing method for a deep-sea equipment water pressure test measuring wire joint according to claim 1, characterized in that: The two external metal cores (4) are connected by welding to form a metal connector (5) at the welding position. The surface of the metal connector (5) is smooth.

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