A deep-sea water-tight cable and assembly water-tight testing system

Abstract

The application relates to a water-tight test system for deep-sea water-tight cable and assembly, which comprises a water-tight test tank, a cable clamp, a water inlet device and a water pressure control device. The water-tight test tank is provided with a clamp hole, the cable clamp is installed in the clamp hole and is sealed between the clamp hole and the water-tight test tank, the cable clamp is used for clamping the water-tight cable, the water inlet device is connected with the water-tight test tank and is used for supplying water into the water-tight test tank, and the water pressure control device is connected with the water-tight test tank and is used for increasing and maintaining the water pressure in the water-tight test tank. The water-tight test system can perform longitudinal and transverse water-tight tests on the water-tight cable and assembly, realizes dynamic test, and completes performance test of the water-tight cable in deep-sea environment.

Description

Technical Field

[0001] This invention relates to the field of cable testing technology, specifically to a watertight testing system for deep-sea sealed cables and components. Background Technology

[0002] Building a maritime power is an important part of China's development. Underwater equipment systems are constantly evolving towards deeper, stronger, and more reliable capabilities. Special watertight cables and components are crucial supporting products for modern ships, especially underwater equipment, directly affecting its safety, reliability, sophistication, and combat capabilities. As underwater equipment continues to develop at greater depths, the requirements for the water pressure resistance of watertight cables are becoming increasingly stringent, expanding from the original 200m depth to the current 10,000m depth.

[0003] The requirements for testing equipment for watertight cables typically follow the test methods specified in GJB 1916-1994 and GJB 774-2020, primarily focusing on meeting the longitudinal watertightness requirements under hydrostatic pressure. However, there are few standards specifying longitudinal and transverse tests under dynamic water pressure (especially operation under transverse water pressure); verification is mostly conducted through actual operating conditions combined with the aforementioned two standards. For example, this involves assessing changes in signal transmission, electrical performance, and other operating conditions of watertight cable assemblies at different depths and during prolonged periods of cyclical water pressure variations.

[0004] Therefore, with the increasing technical requirements for watertight cables, the difficulty of their watertight testing has also become more challenging. There is an urgent need for a device that can realistically simulate the water pressure conditions experienced by cables and components used in underwater equipment systems, providing a verification method for the research and development and production of watertight cables and components, and ensuring that the delivered products meet the requirements. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a watertight testing system for deep-sea sealed cables and components, which can perform watertight tests on water-sealed cables and watertight cable components, and can effectively simulate the water pressure changes of water-sealed cables during underwater surfacing or diving.

[0006] To achieve the above objectives, the present invention provides a watertight testing system for deep-sea sealed cables and components, comprising a watertight testing tank, a cable clamp, a water inlet device, and a water pressure control device. The watertight testing tank is provided with a clamp hole, the cable clamp is installed in the clamp hole and is sealed to the watertight testing tank, the cable clamp is used to clamp the watertight cable, the water inlet device is connected to the watertight testing tank and is used to supply water into the watertight testing tank, and the water pressure control device is connected to the watertight testing tank and is used to increase and maintain the water pressure inside the watertight testing tank.

[0007] Furthermore, it also includes an operation control mechanism, which is connected to the water pressure control device.

[0008] Furthermore, it also includes a discharge mechanism, which includes a discharge pipe, a discharge valve, and a flow detection instrument. The discharge pipe is connected to a watertight test tank, the discharge valve is installed on the discharge pipe, and the flow detection instrument is installed on the discharge pipe to detect the water flow rate in the discharge pipe.

[0009] Furthermore, the watertight test tank has clamp holes on its opposite side walls.

[0010] Furthermore, it also includes a sliding detection mechanism for detecting the movement of the water-sealed cable held in the cable clamp.

[0011] Furthermore, the slip detection mechanism includes a detection baffle and a displacement detector. The detection baffle is rotatably mounted on the watertight test tank and located above the clamp hole. The detection baffle can be rotated downwards to rest on the watertight cable installed in the clamp hole. The displacement detector is used to detect the displacement of the detection baffle.

[0012] Furthermore, the water inlet device includes an inlet pipe connected to the watertight test tank, a first check valve, and a second check valve. Both the first and second check valves are installed on the inlet pipe, and the flow direction of both the first and second check valves is towards the watertight test tank. The water pressure control device includes an oil-water booster cylinder, an automatic reversing valve, a hydraulically controlled check valve, and an oil supply mechanism. The water cylinder section of the oil-water booster is connected to the inlet pipe, and the connection point is located between the first and second check valves. The two outlets of the automatic reversing valve are respectively connected to the two interfaces of the oil cylinder section of the oil-water booster cylinder through oil inlet pipes, and both oil inlet pipes are equipped with hydraulically controlled check valves. The flow direction of the hydraulically controlled check valves is towards the oil cylinder section. The oil supply mechanism is connected to the inlet of the automatic reversing valve, and the automatic reversing valve is connected to the operation control mechanism.

[0013] Furthermore, the water pressure control device also includes a proportional overflow valve and a pressure sensor. The oil supply mechanism includes an oil supply pipe connected to the inlet of the automatic reversing valve. The proportional overflow valve is connected to the oil supply pipe. The pressure sensor is installed on the watertight test tank to measure the water pressure inside the tank. Both the proportional overflow valve and the pressure sensor are connected to the operation control mechanism.

[0014] Furthermore, the water pressure control device also includes a pressure holding assembly, which includes an accumulator, a pressure holding pipe, a pressure holding valve, a pressure holding oil inlet pipe, and a pressure holding oil inlet check valve. The interface for controlling pressurization on the oil cylinder of the oil-water booster cylinder is connected to the accumulator through the pressure holding pipe. The pressure holding valve is located on the pressure holding pipe. The accumulator is connected to the oil supply mechanism through the pressure holding oil inlet pipe. The pressure holding oil inlet check valve is located on the pressure holding oil inlet pipe, and the flow direction of the pressure holding oil inlet check valve is towards the accumulator.

[0015] Furthermore, the cable clamp includes a clamp cylinder, an annular elastic seal, a clamping member, a potting clamp, and a conical sealing colloid. The annular elastic seal is fitted onto the water-sealed cable. The clamp cylinder is mounted on the annular elastic seal and fixed in the clamp hole. The clamping member is fixedly connected to one end of the clamp cylinder and extends into the clamp cylinder. The clamping member applies pressure to the annular elastic seal, causing it to deform radially. The potting clamp is fitted onto the water-sealed cable and fixedly connected to the other end of the clamp cylinder. The potting clamp has a conical inner hole, which gradually increases in size from one end near the clamp cylinder to the other end. The conical sealing colloid is tightly fitted onto the water-sealed cable and is located in the conical inner hole, adhering tightly to the hole wall.

[0016] As described above, the watertightness testing system of the present invention has the following beneficial effects:

[0017] By setting up a watertight testing tank, cable clamps, a water inlet device, and a water pressure control device, the system operates as follows: First, the cable clamp is fitted onto the water-sealed cable and tightened. Then, the cable clamp is installed in the clamp hole, and the water-sealed cable extends into the watertight testing tank. After installation, the water-sealed cable is fixed, with its end located inside the tank. Water is supplied to the watertight testing tank through the water inlet device, keeping the end of the water-sealed cable submerged in water and subjected to longitudinal pressure for longitudinal watertight testing. The water pressure control device can pressurize the watertight testing tank and perform watertight testing on the watertight components installed on the water-sealed cable, simulating deep-sea underwater pressure. Furthermore, by changing the water pressure inside the watertight testing tank, the system simulates water pressure changes during underwater ascent or descent. This watertight testing system can perform longitudinal and lateral watertight tests on watertight cables and components, enabling dynamic testing and completing performance testing of water-sealed cables in a deep-sea environment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the watertightness testing system of the present invention.

[0019] Figure 2 This is a schematic diagram of the watertight test tank and the components installed thereon in this invention.

[0020] Figure 3This is a schematic diagram of the watertight test tank and the components installed thereon in this invention.

[0021] Figure 4 for Figure 3 Front view.

[0022] Figure 5 for Figure 4 Enlarged view of circle B.

[0023] Figure 6 This is a simplified structural diagram of the watertightness testing system of the present invention.

[0024] Figure 7 This is a schematic diagram of the watertight test fixture in this invention.

[0025] Figure 8 This is a schematic diagram of the watertight test fixture in this invention.

[0026] Figure 9 This is an exploded view of the watertight test fixture in this invention.

[0027] Figure 10 for Figure 3 Front view.

[0028] Figure 11 This is a schematic diagram of the longitudinal test performed inside a watertight test tank.

[0029] Figure 12 This is a schematic diagram of the operation when performing a lateral test inside a watertight test tank.

[0030] Explanation of icon numbers

[0031] 1 Watertight Test Tank

[0032] 11 Main Tank

[0033] 12 end caps

[0034] 13 High-strength connecting rods

[0035] 14 Pressure seat

[0036] 2. Water pressure control device

[0037] 21 Oil-water booster cylinder

[0038] 211 Water Tank Section

[0039] 212 Hydraulic Cylinder Section

[0040] 22 Automatic reversing valve

[0041] 23 Hydraulic Control Check Valve

[0042] 24 Oil inlet pipe

[0043] 25. Oil supply organizations

[0044] 251 Oil supply pipe

[0045] 252 fuel tank

[0046] 253 Oil Pump

[0047] 254 motor

[0048] 255 Third check valve

[0049] 256 Oil Suction Filter

[0050] 257 Pressure Oil Filter

[0051] 258 Temperature Sensor

[0052] 259 Pressure gauge

[0053] 26 Proportional relief valve

[0054] 27 Pressure Sensor

[0055] 28 Pressure Holding Assembly

[0056] 281 Accumulator

[0057] 282 Pressure Holding Tube

[0058] 283 Pressure Holding Valve

[0059] 284 Pressure Holding Oil Inlet Pipe

[0060] 285 Pressure Holding Inlet Check Valve

[0061] 3. Console

[0062] 4. Discharge mechanism

[0063] 41. Drain pipe

[0064] 42 Relief valve

[0065] 43 Flow measurement instruments

[0066] 44. Pressure relief gauge

[0067] 5. Slippage Detection Agency

[0068] 51 Detection baffle

[0069] 52 Displacement Detector

[0070] 53 stents

[0071] 531 Sliding Sleeve

[0072] 532 Slide Bar

[0073] 54 Limiting rod

[0074] 6. Cable clamps

[0075] 61 Clamping tube

[0076] 62 Annular elastic seal

[0077] 63 Clamping parts

[0078] 64. Glue Dispensing Fixture

[0079] 641 Conical inner hole

[0080] 65 Conical Sealing Gel

[0081] 66 Washer Ring

[0082] 67 bolts

[0083] 7. Water inlet device

[0084] 71 Water inlet pipe

[0085] 72 First check valve

[0086] 73 Second check valve

[0087] 74 Inlet Valve

[0088] 75 Water Filter

[0089] 8. Drainage pipe

[0090] 9 bases

[0091] 91 Water collection tank

[0092] 10 Water-sealed cables Detailed Implementation

[0093] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0094] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0095] See Figures 1 to 12 This invention provides a watertight testing system for deep-sea sealed cables and components, including a watertight testing tank 1, a cable clamp 6, a water inlet device 7, and a water pressure control device 2. The watertight testing tank 1 is provided with a clamp hole, and the cable clamp 6 is installed in the clamp hole and sealed with the watertight testing tank 1. The cable clamp 6 is used to clamp the water-sealed cable 10, and the water-sealed cable 10 extends laterally after being installed in the cable clamp 6. The water inlet device 7 is connected to the watertight testing tank 1 and is used to supply water into the watertight testing tank 1. The water pressure control device 2 is connected to the watertight testing tank 1 and is used to increase and maintain the water pressure inside the watertight testing tank 1.

[0096] The basic working principle of the watertightness testing system involved in this invention is as follows: In use, the cable clamp 6 is first fitted onto the water-sealed cable 10 and clamped tightly. Then, the cable clamp 6 is installed in the clamp hole, so that part of the water-sealed cable 10 extends into the watertightness testing tank 1. See [link to relevant documentation]. Figure 11After installation, the water-sealed cable 10 is fixed in place, with its end located inside the tank. The water-sealed cable 10 is sealed to the cable clamp 6, and the cable clamp 6 is sealed to the watertightness test tank 1, ensuring the tank's airtightness. Water is supplied to the watertightness test tank 1 through the water inlet device 7, ensuring the water-sealed cable 10 is completely submerged, simulating longitudinal pressure for a longitudinal watertightness test. The water pressure control device 2 pressurizes the watertightness test tank 1 to simulate deep-sea underwater pressure, and by changing the water pressure inside the tank 1, it simulates water pressure changes during underwater ascent or descent. This watertightness test system can perform watertightness tests on watertight cables and components, and can effectively simulate water pressure changes during underwater ascent or descent, enabling dynamic testing and completing performance testing of the water-sealed cable 10 in a deep-sea environment. In addition, a corresponding watertight component, such as a connector, is usually installed on the water-tight cable 10. The structure formed by the watertight component and the water-tight cable 10 is called the watertight cable assembly. The watertight testing system can also test the watertight cable assembly. The testing method is the same as that of the water-tight cable 10. After the water-tight cable 10 is installed on the watertight testing tank 1, the watertight component is located inside the tank.

[0097] See Figures 1 to 10 The present invention will be further described below with reference to a specific embodiment:

[0098] In this embodiment, as a preferred design, the watertightness testing system further includes an operation control mechanism. This mechanism is connected to both the water inlet device 7 and the water pressure control device 2 to control automatic water filling, pressurization, and pressure maintenance. Specifically, the operation control mechanism may include a PLC controller, control lines, signal lines, corresponding electrical components, a human-machine interface, etc., capable of parameter setting and instruction operation. The PLC controller can be programmed according to actual testing requirements to control the automatic operation of the water inlet device 7 and the water pressure control device 2, thereby automating the testing process. See also... Figure 1 The corresponding components of the operation and control mechanism can be concentrated in the control console 3, which has a human-machine interface, and the entire device can be controlled from the control console 3.

[0099] In this embodiment, see Figure 2 , Figure 3 and Figure 6As a preferred design, the watertightness testing system also includes a venting mechanism 4 installed on the watertightness testing tank 1. The venting mechanism 4 includes a venting pipe 41, a venting valve 42, and a flow detection instrument 43. The venting pipe 41 is connected to the watertightness testing tank 1, the venting valve 42 is installed on the venting pipe 41, and the flow detection instrument 43 is installed on the venting pipe 41 to detect the water flow rate in the venting pipe 41 and send a signal. The flow detection instrument 43 can specifically be a flow switch. When water is injected into the watertightness testing tank 1, the venting valve 42 opens to expel the gas in the tank, ensuring smooth water injection. The flow detection instrument 43 detects the water flow rate in the venting pipe 41 to determine the water injection status in the tank. When water flow is detected in the venting pipe 41, a signal is sent to control the venting valve 42 to close in a timely manner. Preferably, the relief valve 42 is a two-way solenoid water valve, connected to the operation control mechanism. The flow detection instrument 43 is also connected to the operation control mechanism, transmitting signals to it. The operation control mechanism then controls the relief valve 42 to open and close automatically and promptly. A relief pressure gauge 44 is also installed on the relief pipe 41 to observe pressure changes during relief, serving as an operational guide parameter. The relief mechanism 4 is also used for rapid pressure relief of the watertight test tank 1. In case of experimental failure, the relief mechanism 4 is opened to release the water pressure inside the tank, ensuring experimental safety.

[0100] In this embodiment, see Figure 2 , Figure 3 and Figure 4 As a preferred design, the watertight test tank 1 includes a cylindrical main tank body 11 and end cover plates 12 fixedly connected to both ends of the main tank body 11. The end cover plates 12 are fixedly connected to the flanges at the left and right ends of the main tank body 11 by a ring of high-strength bolts and nuts. Furthermore, multiple high-strength connecting rods 13 are evenly arranged circumferentially around the outer periphery of the main tank body 11. The connecting rods 13 pass through the flanges at both ends of the main tank body 11 and the two end cover plates 12, and are tightened at both ends with high-strength nuts, thereby ensuring that the entire watertight test tank 1 has sufficient strength, giving it good pressure resistance and enhancing the safety of the equipment. The main tank body 11 and the front and rear end cover plates 12 are made of stainless steel, providing good corrosion resistance.

[0101] In this embodiment, see Figure 2 , Figure 3 and Figure 4As a preferred design, the clamping holes on the watertight testing tank 1 are located on the end caps 12 at both ends. Multiple clamping holes with different radii can be provided, each size used for testing water-tight cables 10. Specifically, in this embodiment, one end cap 12 has three clamping holes for Φ50, Φ25, and Φ40 water-tight cables 10, respectively, while the other end cap 12 has one clamping hole for Φ80 water-tight cables 10, thus enabling simultaneous testing of multiple cables. During use, clamping holes without cables can be sealed with corresponding sealing caps. In this embodiment, see [reference needed]. Figure 3 After the water-sealed cable 10 is clamped in the cable clamp 6, the cable clamp 6 is pressed and fixed by the pressure seat 14. The pressure seat 14 is fixed to the end cover plate 12 by high-strength bolts, which facilitates installation and disassembly.

[0102] As a preferred design, the two end caps 12 of the watertight testing tank 1 have horizontally opposite clamping holes. During operation, the water-sealing cable 10 enters from the clamping hole on one end cap 12 and exits from the clamping hole on the other end cap 12. One section of the water-sealing cable 10 is inside the tank. This cable section inside the tank can be horizontal or curved. (See [reference]). Figure 12 The water-tight cable 10, located inside the tank, withstands the water pressure within the tank to achieve a lateral watertightness test. A watertight assembly installed on the water-tight cable 10 inside the tank can also perform a lateral watertightness test.

[0103] In this embodiment, see Figure 2 , Figure 3 and Figure 5 As a preferred design, the watertight testing system also includes a slippage detection mechanism 5, which is used to detect the movement of the water-sealed cable 10 clamped in the cable clamp 6. The slippage detection mechanism 5 includes a detection baffle 51 and a displacement detector 52. The detection baffle 51 is rotatably mounted on the watertight testing tank 1 and located above the clamp hole. The detection baffle 51 can rotate downwards to rest on the water-sealed cable 10 installed in the clamp hole. The displacement detector 52 is used to detect the displacement of the detection baffle 51 and is connected to the operation control mechanism. During testing, when the water-sealed cable 10 slips, because the lower end of the baffle 51 rests on the water-sealed cable 10, the detection baffle 51 is driven by the water-sealed cable 10 and rotates, which is detected by the displacement detector 52. The displacement detector sends a signal to the operation control mechanism, which then controls the release mechanism 4 to open, promptly releasing pressure and ensuring experimental safety.

[0104] In this embodiment, see Figure 2 , Figure 3 and Figure 5Furthermore, the detection baffle 51 is mounted on the watertight test tank 1 via a bracket 53. The displacement detector 52 can be a limit switch, or other types of sensors, as long as they can detect the displacement of the detection plate. In this embodiment, the sliding detection mechanism 5 also includes a limiting rod 54. The upper end of the limiting rod 54 is mounted on the displacement detector 52 or the bracket 53 by screws and can rotate around its upper end. When the detection plate rotates downward, it rests on the limiting rod 54. By adjusting the position of the limiting rod 54, the working position of the detection plate can be flexibly adjusted to meet the working needs of various occasions, making it flexible and convenient to use. Preferably, in this embodiment, the bracket 53 is an adjustable bracket, comprising two parts: a sliding sleeve 531 fixed on the watertight test tank 1 and a movable frame. The movable frame has a sliding rod 532 installed in the sliding sleeve 531. The sliding rod 532 can move left and right in the sliding sleeve 531, thereby adjusting the position of the detection plate in the left and right directions to meet the testing requirements under different conditions.

[0105] In this embodiment, see Figure 2 and Figure 5 As a preferred design, the water inlet device 7 includes a water inlet pipe 71 connected to the watertightness test tank 1. The water inlet pipe 71 is connected to a water source, and a ball valve 74 is provided on the water inlet pipe 71 as a water inlet valve. The water inlet valve 74 is preferably a solenoid valve, which is automatically opened and closed by an operating control mechanism. A water filter 75 is also provided on the water inlet pipe 71 to ensure water supply safety.

[0106] In this embodiment, see Figure 2 and Figure 5 As a preferred design, a first check valve 72 and a second check valve 73 are provided on the water inlet pipe 71. The flow direction of both the first check valve 72 and the second check valve 73 is towards the watertight test tank 1. The water pressure control device 2 includes an oil-water booster cylinder 21, an automatic reversing valve 22, a hydraulic check valve 23, and an oil supply mechanism 25. The oil-water booster cylinder 21 is an existing mature product, including a water cylinder section 211 and an oil cylinder section 212. By supplying oil to the two ports of the oil cylinder section 212, the movement of the piston in the water cylinder section 211 can be adjusted. Its specific structure and principle are existing and will not be described in detail here. The water cylinder section 211 of the oil-water booster cylinder 21 is connected to the water inlet pipe 71, and the connection point is located between the first check valve 72 and the second check valve 73. The two outlets of the automatic reversing valve 22 are respectively connected to the two ports of the oil cylinder section 212 of the oil-water booster cylinder 21 through the oil inlet pipe 24. Both oil inlet pipes 24 are equipped with hydraulically controlled check valves 23. The initial flow direction of the hydraulically controlled check valves 23 is towards the oil cylinder section 212. The hydraulically controlled check valves 23 can change their flow direction under the action of their control oil circuit. The oil supply mechanism 25 is connected to the inlet of the automatic reversing valve 22. The automatic reversing valve 22 also has an outlet connected to the return oil tank. See also... Figure 5 For ease of explanation, Figure 6The interface on the left side of the cylinder section 212 is designated as interface C, and the oil inlet pipe 24 connected to it is designated as oil inlet pipe C 24. The interface on the right side of the cylinder section 212 is designated as interface D, and the oil inlet pipe 24 connected to it is designated as oil inlet pipe D 24. During operation, oil is supplied by the oil supply mechanism 25, which controls the automatic reversing valve 22 to switch the oil supply to the cylinder section 212. Specifically, when the automatic reversing valve 22 switches to supply oil to interface C on the left side of the cylinder section 212, the piston moves to the right, and the hydraulic control valve on oil inlet pipe C 24... The check valve 23 can prevent hydraulic oil backflow. The hydraulic oil in the right chamber of the cylinder 212 flows back to the automatic directional valve 22 through the D interface and the D inlet pipe 24 (at this time, the hydraulic control check valve 23 on the right D inlet pipe 24 can flow in reverse) and flows to the return oil groove. When the piston moves to the right, the water cylinder 211 produces a suction effect on the water inlet pipe 71. Due to the first check valve 72 and the second check valve 73, the water in the watertight test tank 1 will not flow back out, and at the same time, water from the external water source is drawn in. When the automatic directional valve 22 switches to supply oil to the D port on the right side of the cylinder section 212, the piston moves to the left. The hydraulic control check valve 23 on the right D inlet pipe 24 prevents hydraulic oil backflow. The hydraulic oil in the left cavity of the cylinder section 212 flows back to the automatic directional valve 22 through the left C port and C inlet pipe 24 (at this time, the hydraulic control check valve 23 on the left C inlet pipe 24 can flow in reverse). When the piston moves to the left, the water cylinder section 211 pressurizes the water inlet pipe 71. Due to the first check valve 72 and the second check valve 73, the water in the water inlet pipe 71 can smoothly enter the watertight test tank 1 through the first check valve 72, realizing water injection and pressurization in the tank, while preventing backflow towards the water source. In the above manner, by controlling the action of the automatic directional valve 22, the reciprocating action of the oil-water booster cylinder 21 is controlled to pressurize the watertight test tank 1. Furthermore, the entire pressurization process can be carried out in stages. Specifically, the automatic reversing valve 22 can be an electromagnetic reversing valve.

[0107] In this embodiment, see Figure 6The oil supply mechanism 25 includes an oil supply pipe 251, an oil tank 252, an oil pump 253, a motor 254, a third check valve 255, an oil suction filter 256, a pressure filter 257, a temperature sensor 258, and a pressure gauge 259. The inlet of the oil pump 253 is connected to the oil tank 252 via a pipeline. The motor 254 drives the oil pump 253, and the outlet of the oil pump 253 is connected to the oil supply pipe 251. The oil suction filter 256 is installed on the pipeline at the inlet of the oil pump 253 for filtration and cleaning. The pressure filter 257 is installed on the oil supply pipe 251 for further filtration and cleaning. The third check valve 255 is installed on the oil supply pipe 251 to prevent hydraulic oil from flowing back into the oil pump 253. The temperature sensor 258 is installed on the pipeline at the inlet of the oil pump 253 to monitor the hydraulic oil temperature, and the pressure gauge 259 is installed on the oil supply pipe 251 to detect the outlet pressure. The oil tank 252 is also equipped with an air filter, a level switch, and a level gauge. The level switch and level gauge are used to monitor the oil level in the oil tank 252, and the air filter is used to filter the pressure entering the oil tank 252 during oil extraction to prevent contamination of the hydraulic oil.

[0108] In this embodiment, see Figure 2 and Figure 5 As a preferred design, the water pressure control device 2 also includes a proportional relief valve 26 and a pressure sensor 27. The proportional relief valve 26 is connected to the oil supply pipe 251, and the pressure sensor 27 is installed on the watertight test tank 1 to measure the water pressure inside the tank. Both the proportional relief valve 26 and the pressure sensor 27 are connected to the operating control mechanism. The proportional relief valve 26 and the pressure sensor 27 form a negative feedback closed-loop measurement and control mechanism. The pressure sensor 27 feeds back the water pressure signal inside the watertight test tank 1 to the operating control mechanism. Based on this pressure signal, the opening degree of the proportional relief valve 26 is controlled to adjust the flow rate and pressure of the automatic reversing valve 22, thereby adjusting the flow rate and pressure of the hydraulic oil entering the oil cylinder section 212 of the oil-water booster cylinder 21, thus realizing the pressurization operation of the oil-water booster cylinder 21.

[0109] In this embodiment, see Figure 5 As a preferred design, the water pressure control device 2 also includes a pressure holding assembly 28, which includes an accumulator 281, a pressure holding pipe 282, a pressure holding valve 283, a pressure holding oil inlet pipe 284, and a pressure holding oil inlet check valve 285. The oil cylinder section 212 of the oil-water booster cylinder 21 has an interface for controlling pressurization (i.e.,...) Figure 5The D-port on the right side of the hydraulic cylinder section 212 is connected to the accumulator 281 via a pressure-holding pipe 282. A pressure-holding valve 283 is installed on the pressure-holding pipe 282. The accumulator 281 is connected to the oil supply mechanism 25 via a pressure-holding oil inlet pipe 284. Specifically, one end of the pressure-holding oil inlet pipe 284 is connected to the oil supply pipe 251, and the other end is connected to the pressure-holding pipe 282, with the connection point located between the pressure-holding valve 283 and the accumulator 281. A pressure-holding oil inlet check valve 285 is installed on the pressure-holding oil inlet pipe 284, and the flow direction of the pressure-holding oil inlet check valve 285 is towards the accumulator 281. During the pressurization phase, the hydraulic oil supplied by the oil supply mechanism 25 enters the accumulator 281 through the pressure-holding oil inlet pipe 284 and stores energy. The pressure-holding oil inlet check valve 285 is used to ensure that the hydraulic oil does not flow back towards the oil supply pipe 251. Once the pressure inside the watertight test tank 1 reaches the set value, the automatic reversing valve 22 closes, ceasing oil supply to the oil-water booster cylinder 21. Then, during the pressure-holding phase, the pressure-holding valve 283 opens, and the accumulator 281 maintains the pressure. In this embodiment, the pressure-holding valve 283 is a two-way solenoid valve connected to the operation control mechanism. The operation control mechanism automatically controls the opening and closing of the pressure-holding valve 283, thereby automatically maintaining the pressure.

[0110] Of course, the water pressure control device 2 in this invention is not limited to the form in the above embodiments. Other existing suitable devices can also be used, as long as they can pressurize and stabilize the watertightness test tank 1.

[0111] In this embodiment, the entire testing process can be fully automated through the operation control mechanism. After inputting the control pressure value through the human-machine interface of the operation control mechanism, the process begins. Based on the water pressure measurement value fed back by the pressure sensor 27, the operation control mechanism automatically adjusts the electromagnetic proportional valve, thereby automatically controlling the oil-water booster cylinder 21 to boost pressure in a prescribed manner. To avoid excessive pressure surges (or fluctuations) after reversal, multi-stage pressurization is preferably used when pressurizing the watertight test tank 1. By controlling the switching of the automatic reversing valve 22, the oil-water booster cylinder 21 automatically performs multiple water intake and pressure switching operations to complete multiple pressurization operations. The pressure automatically stops when the set value is reached, entering a pressure holding state. When the pressure inside the tank drops to the set lower limit, the automatic reversing valve 22 is automatically opened based on the signal from the pressure sensor 27 to continue the pressurization operation. When pressure relief is required, the operation control mechanism controls the release valve 42 of the release mechanism 4 to automatically open. By operating the pressure-time curve set by the control mechanism, the system automatically performs pressure increase, pressure holding and pressure release for a specified time to simulate the pressure changes of underwater equipment during the surfacing and diving process in the deep sea, thereby evaluating the dynamic water pressure resistance performance of the water-sealed cable 10 and its components.

[0112] In this embodiment, see Figure 1 and Figure 2The lower end of the watertight test tank 1 is also provided with a drain pipe 8 that communicates with the inside of the tank for rapid discharge of water from the watertight test tank 1. The watertight test tank 1 is fixed on a base 9, and a water collection tank 91 is provided on the base 9. The drain pipe 8 and the discharge pipe 41 of the discharge mechanism 4 extend into the water collection tank 91 to discharge water into the water collection tank 91.

[0113] In this embodiment, see Figures 7 to 10 As a preferred design, the cable clamp 6 includes a clamp cylinder 61, an annular elastic seal 62, a clamping member 63, a potting clamp 64, and a conical sealing adhesive 65. The annular elastic seal 62 is fitted onto the water-sealed cable 10. The clamp cylinder 61 is fitted onto the annular elastic seal 62 and fixed in the clamp hole. The clamping member 63 is fixedly connected to one end of the clamp cylinder 61 and extends into the clamp cylinder 61. The clamping member 63 applies pressure to the annular elastic seal 62, causing the annular elastic seal to... The sealing element 62 undergoes radial deformation. The glue-filling clamp 64 is fitted onto the water-sealed cable 10 and fixedly connected to the other end of the clamp cylinder 61. The glue-filling clamp 64 has a conical inner hole 641, and the conical inner hole 641 gradually increases in size from one end near the clamp cylinder 61 to the other end. The conical sealing glue 65 is tightly fitted onto the water-sealed cable 10. The shape of the conical sealing glue 65 matches the inner shape of the cone. The conical sealing glue 65 is located in the conical inner hole 641 and is in close contact with the hole wall.

[0114] When using, please refer to Figure 5 The cable clamp 6 is installed on the water-tight cable 10. The cable clamp 6 is fixedly installed on the watertight test tank 1 through the clamp cylinder 61, and the conical sealing colloid 65 is located inside the tank. The large end of the conical inner hole 641 faces the inside of the tank and the small end faces the outside of the tank. The clamping member 63 is located outside the tank. In this way, one end of the water-tight cable 10 is inserted into the watertight test tank 1, and the other end is outside the watertight test tank 1. The cable clamp 6 fixes the water-sealed cable 10 by the following two clamping methods: (1) On the outside of the tank, the clamping member 63 is used to press the annular elastic seal 62 inside the clamp cylinder 61 tightly, so that the annular elastic seal 623 expands radially and fixes the water-sealed cable 10; (2) On one side inside the tank, the water-sealed cable 10 is clamped, fixed and sealed by the conical sealing colloid 65 and the glue-filling clamp 64. When the water pressure is greater, the force acting on the conical sealing colloid 65 is greater. The pressure is directed outward. Under the action of the glue-filling clamp 64, the conical sealing colloid 65 expands further radially. The clamping force of the conical sealing colloid 65 on the water-sealed cable 10 is greater, which can meet the requirements of the high-pressure water-sealing experiment in deep seawater.

[0115] In this embodiment, see Figure 9 and Figure 10As a preferred design, the annular elastic seal 62 is further provided with gaskets 66 at both ends. The gaskets 66 are made of stainless steel, which can better compress the annular elastic seal 62 and improve the sealing effect. The annular elastic seal 62 can be made of watertight rubber tape or a gasket, which has excellent watertightness and elastic deformation capability. The outer diameter of the gaskets 66 and the annular elastic seal is determined according to the inner diameter of the clamp cylinder 61. The inner diameter of the gaskets 66 and the annular elastic seal 62 can be selected according to the outer diameter requirements of the water-sealed cable 10 being tested. In this embodiment, the gasket 66 near the glue-filling clamp 64 is pressed against the end face of the glue-filling clamp 64. Alternatively, a stepped surface can be provided in the inner hole of the clamp cylinder 61, and the gasket 66 near the glue-filling clamp 64 can be pressed against the stepped surface.

[0116] In this embodiment, see Figure 8 and Figure 9 As a preferred design, the inner bore of the clamping cylinder 61 includes a smooth section and a threaded section. The annular elastic seal 62 is located in the smooth section, and the clamping member 63 is a clamping nut with a threaded portion for insertion into the clamping cylinder 61. The length of the threaded portion is not shorter than the length of the clamping cylinder 61. It is screwed into the threaded section through the threaded portion and pressed against the annular elastic seal 62, ensuring a stable and reliable connection. Furthermore, by rotating the clamping nut, the degree of compression on the annular elastic seal 62 can be adjusted, thereby adjusting the clamping force on the water-sealed cable 10. Of course, the clamping member 63 can also be fixedly connected to the clamping cylinder 61 in other ways.

[0117] In this embodiment, see Figure 9 and Figure 10 As a preferred design, the conical inner hole 641 of the glue-filling fixture 64 is conical, meaning its cross-section is circular. Correspondingly, the conical sealing glue 65 is also conical in shape, resulting in a better sealing effect. Of course, the conical inner hole 641 can also be a square cone or other shapes. Preferably, the conical sealing glue 65 is formed by solidifying hot melt adhesive or epoxy resin. By filling the conical inner hole 641 with elastic hot melt adhesive or epoxy resin, the conical sealing glue 65 is formed after solidification. In this way, the conical inner hole 641 and the conical sealing glue 65 are bonded together, as are the conical sealing glue 65 and the water-sealed cable 10, resulting in a stronger sealing and fixing effect. At the same time, because the inner hole of the fixture cylinder 61 includes a smooth hole section and a threaded hole section, the elastic hot melt adhesive or epoxy resin is easily deformed and embedded in the fixture cylinder 61 when squeezed, but it will not be embedded in the threads, avoiding the problem of the tight-fitting nut being difficult to disassemble.

[0118] In this embodiment, see Figure 8 and Figure 9As a preferred design, the glue-filling fixture 64 and the fixture cylinder 61 are fixedly connected by bolts 67. There are multiple bolts 67, and the multiple bolts 67 are arranged in a ring array around the axis of the fixture cylinder 61 to ensure connection stability.

[0119] The watertight test fixture in this embodiment has a good clamping effect on the water-sealed cable 10, which is stable and reliable. The clamping effect increases with the increase of water pressure. By adopting two clamping methods, the water-sealed cable 10 subjected to large longitudinal forces can be firmly fixed to prevent slippage and test failure. This effectively solves the problem that the water-sealed cable 10 is easy to slip off the test equipment when the watertight test is performed under high pressure, and it also facilitates the disassembly of the cable after the test.

[0120] The watertight testing system of this invention, combined with the current operating conditions of watertight cables and components, can perform dynamic longitudinal and transverse dynamic watertight tests on watertight cables and components, and can effectively simulate the water pressure changes of underwater devices during underwater surfacing or diving. In particular, it can conduct experiments under deep-sea high pressure conditions. It can verify the safety of the watertight cable 10 in terms of longitudinal and transverse watertightness within (0-30MPa), and can also be used to verify the electrical performance, transmission performance and other working capabilities of watertight cables and components. It has a good clamping effect on the watertight cable 10, is stable and reliable in operation, and has high test safety.

[0121] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0122] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A watertight testing system for deep-sea sealed cables and components, characterized in that: The system includes a watertight test tank (1), a cable clamp (6), a water inlet device (7), and a water pressure control device (2). The watertight test tank (1) has a clamp hole, and the cable clamp (6) is installed in the clamp hole and sealed to the watertight test tank (1). The cable clamp (6) is used to clamp the water-tight cable (10). The water inlet device (7) is connected to the watertight test tank (1) and is used to supply water to the watertight test tank (1). The water pressure control device (2) is connected to the watertight test tank (1) and is used to increase and maintain the water pressure inside the watertight test tank (1). The cable clamp (6) includes a clamp cylinder (61), an annular elastic seal (62), a clamping member (63), a glue-filling clamp (64), and a conical sealing glue (65). The annular elastic seal (62) is fitted onto the water-tight cable (10). On the 0), the clamp cylinder (61) is mounted on the annular elastic seal (62) and fixed in the clamp hole. The clamping member (63) is fixedly connected to one end of the clamp cylinder (61) and extends into the clamp cylinder (61). The clamping member (63) applies pressure to the annular elastic seal (62) to cause the annular elastic seal (62) to deform radially. The glue-filling clamp (64) is sleeved on the water-sealed cable (10) and fixedly connected to the other end of the clamp cylinder (61). The glue-filling clamp (64) has a conical inner hole (641), and the conical inner hole (641) gradually increases in size from one end near the clamp cylinder (61) to the other end. The conical sealing glue (65) is tightly sleeved on the water-sealed cable (10). The conical sealing glue (65) is located in the conical inner hole (641) and is in close contact with the hole wall.

2. The watertightness testing system according to claim 1, characterized in that: It also includes an operation control mechanism, which is connected to the water pressure control device (2) for control.

3. The watertightness testing system according to claim 1 or 2, characterized in that: It also includes a discharge mechanism (4), which includes a discharge pipe (41), a discharge valve (42) and a flow detection instrument (43). The discharge pipe (41) is connected to the watertight test tank (1), the discharge valve (42) is installed on the discharge pipe (41), and the flow detection instrument (43) is installed on the discharge pipe (41) and can detect the water flow in the discharge pipe (41).

4. The watertightness testing system according to claim 1, characterized in that: The watertight test tank (1) has clamp holes on its opposite side walls.

5. The watertightness testing system according to claim 1 or 2, characterized in that: It also includes a sliding detection mechanism (5), which is used to detect the movement of the water-sealed cable (10) held in the cable clamp (6).

6. The watertightness testing system according to claim 5, characterized in that: The slip detection mechanism (5) includes a detection baffle (51) and a displacement detector (52). The detection baffle (51) is rotatably mounted on the watertight test tank (1) and located above the clamp hole. The detection baffle (51) can be rotated downwards to rest on the watertight cable (10) installed in the clamp hole. The displacement detector (52) is used to detect the displacement of the detection baffle (51).

7. The watertightness testing system according to claim 2, characterized in that: The water inlet device (7) includes an inlet pipe (71) connected to the watertight test tank (1), a first check valve (72), and a second check valve (73). The first check valve (72) and the second check valve (73) are both installed on the inlet pipe (71), and the flow direction of the first check valve (72) and the second check valve (73) is towards the watertight test tank (1). The water pressure control device (2) includes an oil-water booster cylinder (21), an automatic reversing valve (22), a hydraulic check valve (23), and an oil supply mechanism (25). The water cylinder section (211) of the water booster cylinder (21) is connected to the water inlet pipe (71), and the connection point is located between the first check valve (72) and the second check valve (73). The two outlets of the automatic reversing valve (22) are respectively connected to the two interfaces of the oil cylinder section (212) of the oil-water booster cylinder (21) through the oil inlet pipe (24), and both oil inlet pipes (24) are equipped with hydraulic control check valves (23). The oil supply mechanism (25) is connected to the inlet of the automatic reversing valve (22), and the automatic reversing valve (22) is connected to the operation control mechanism.

8. The watertightness testing system according to claim 7, characterized in that: The water pressure control device (2) also includes a proportional overflow valve (26) and a pressure sensor (27). The oil supply mechanism (25) includes an oil supply pipe (251) connected to the inlet of the automatic reversing valve (22). The proportional overflow valve (26) is connected to the oil supply pipe (251). The pressure sensor (27) is installed on the watertight test tank (1) to measure the water pressure inside the tank. Both the proportional overflow valve (26) and the pressure sensor (27) are connected to the operation control mechanism.

9. The watertightness testing system according to claim 7, characterized in that: The water pressure control device (2) further includes a pressure holding assembly (28), which includes an accumulator (281), a pressure holding pipe (282), a pressure holding valve (283), a pressure holding oil inlet pipe (284), and a pressure holding oil inlet check valve (285). The interface for controlling pressurization on the oil cylinder part (212) of the oil-water booster cylinder (21) is connected to the accumulator (281) through the pressure holding pipe (282). The pressure holding valve (283) is located on the pressure holding pipe (282). The accumulator (281) is connected to the oil supply mechanism (25) through the pressure holding oil inlet pipe (284). The pressure holding oil inlet check valve (285) is located on the pressure holding oil inlet pipe (284), and the flow direction of the pressure holding oil inlet check valve (285) is towards the accumulator (281).

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