Sealing device for water pressure test of optical cable in deep and far sea

Abstract

The utility model discloses a sealing device for a deep sea optical cable hydrostatic test, and belongs to the technical field of sea optical cable test equipment. Comprising a sealing sleeve which is provided with channels for a test cable to penetrate out, the channels are sequentially divided into a first channel, a second channel, a third channel, a fourth channel and a fifth channel, and the outer side wall corresponding to the first channel is assembled with a test container; the composite sealing ring is mounted in the second channel; the outer cylindrical surface is in threaded connection with the third channel; the conical sealing ring is mounted in the fourth channel; the pressing bolt extrudes the conical sealing ring, and the outer cylindrical face is in threaded connection with the fifth channel. According to the utility model, the composite sealing ring is matched with the pressing lock to form a first layer of water-blocking structure, and the anti-loosening ring, the transition ring, the conical sealing ring and the pressing bolt are matched to form a second layer of water-blocking structure, so that the safety and the reliability of a deep and far submarine optical cable hydraulic test are ensured, the cost is saved, and the accuracy of a test result is also ensured.

Description

Technical Field

[0001] The utility model relates to a sealing device for a deep-sea optical cable water pressure test, belonging to the technical field of submarine optical cable test equipment. Background Art

[0002] Due to the special laying and operating environment of submarine optical cables, it is necessary to conduct water pressure tests on the manufactured products. The water pressure test includes longitudinal water seepage test and anti-hydrostatic pressure test. The longitudinal water seepage test is used to check whether the cable core water seepage length is within the controllable range when the submarine optical cable is damaged or broken in seawater, and the anti-hydrostatic pressure test is used to check whether the submarine optical cable can work normally in the corresponding water depth.

[0003] The test water pressure in the original submarine cable standard is relatively low, generally 5Mpa. As the application depth of submarine optical cables increases, the maximum depth has reached 8,000 meters, and the test water pressure has also risen to 80Mpa. The original water pressure test sealing device is relatively simple, such as Figure 1 As shown, similar to a hexagonal bolt, the external thread 1 matches the internal thread of the test container (cylinder), a conical sealing plug is built into the external thread 1, and after the test cable passes through the through hole 2, the water pressure test sealing device is tightened.

[0004] The above-mentioned water pressure test sealing device can still meet the requirements under low water pressure. Under high water pressure, water leakage often occurs due to poor sealing of the through hole 2, resulting in test failure, and accompanied by the safety risk of the test cable being pressurized and ejected from the through hole. Specifically, the above-mentioned water pressure test sealing device has the following defects:

[0005] 1. Safety: The original water pressure test sealing device does not have any fastening measures for the test cable. When doing a longitudinal water seepage test, the test cable will be squeezed outward by the water pressure. Under high water pressure, there is a risk of the test cable being ejected, and the safety is extremely low.

[0006] 2. Effectiveness: The sealing performance is poor. Under medium water pressure, water will seep out from the gaps around the through hole 2, causing the test water pressure to be unstable.

[0007] 3. Convenience: The original water pressure test sealing device has no other anti-water seepage measures. It relies entirely on the water pressure test sealing device for sealing. It needs to be tightened and disassembled with the help of a large pipe clamp, which is very troublesome. Excessive tightening will cause the outer hexagonal part to wear and deform, reducing the service life.

[0008] 4. High cost: Each test cable with an outer diameter needs to be equipped with a new set of sealing devices. The original sealing device is made of stainless steel and needs to be customized for each test, resulting in excessively high test costs. Utility Model Content

[0009] The purpose of the utility model is to provide a sealing device for water pressure testing of deep-sea optical cables in view of the deficiencies of the above-mentioned prior art, so as to ensure the safety and reliability of the water pressure testing of deep-sea optical cables, save costs and ensure the accuracy of the test results.

[0010] The technical solution of the utility model is as follows: A sealing device for a deep-sea optical cable water pressure test, characterized in that it comprises:

[0011] A sealing sleeve, wherein a channel for the test cable to pass through is provided inside the sealing sleeve, and the channel is divided into a first channel, a second channel, a third channel, a fourth channel, and a fifth channel in sequence along its axial direction. The outer side wall of the sealing sleeve corresponding to the first channel is provided with an external thread assembled with the internal thread of the test container (cylinder), and the fourth channel is a truncated cone cavity;

[0012] A composite sealing ring installed in the second channel;

[0013] A compression lock, which has a central hole for the test cable to pass through, an inner end of which squeezes the outer end of the composite sealing ring, and an outer cylindrical surface of which is threadedly connected to the inner wall of the third channel;

[0014] A conical sealing ring installed in the fourth channel;

[0015] A tightening bolt is provided with a central hole for the test cable to pass through, an inner end of which squeezes the outer end of the conical sealing ring, and an outer cylindrical surface of which is threadedly connected with the inner wall of the fifth channel.

[0016] In the above scheme: the sealing sleeve is made of alloy steel to ensure its strength; five channels are designed in the sealing sleeve, the first channel is used to pass the test cable, the second channel is used to install the composite sealing ring, the third channel has an internal thread for installing the compression lock, the truncated cone cavity is used to install the conical sealing ring and the anti-loosening ring and transition ring at both ends, and the last fifth channel also has an internal thread for installing the compression bolt; the composite sealing ring cooperates with the compression lock to form the first layer of water-blocking structure, and the anti-loosening ring, transition ring, conical sealing ring and compression bolt cooperate to form the second layer of water-blocking structure.

[0017] Furthermore, the composite sealing ring is composed of a plurality of metal sealing rings and a plurality of rubber sealing rings arranged one by one at intervals, and the outermost end of the composite sealing ring is the metal sealing ring.

[0018] In the above scheme: the composite sealing ring structure is that the metal sealing ring (optionally made of metal iron) and the rubber sealing ring are spaced and tightly installed, ensuring that a rubber sealing ring is sandwiched between the two metal sealing rings, and the outermost end of the composite sealing ring is the metal sealing ring; the two end faces of the metal sealing ring are flat, the two end faces of the rubber sealing ring are flat, and the outer side surface is arc-shaped, the outer diameter of the rubber sealing ring is larger than the outer diameter of the metal sealing ring, the inner diameters of the metal sealing ring and the rubber sealing ring are consistent, which is more matched with the outer diameter of the test cable, and the overall length of the composite sealing ring is slightly longer than the second channel; the test cable passes through the composite sealing ring, and after the composite sealing ring is installed in the second channel, the composite sealing ring is compressed using a compression lock. At this time, the rubber sealing ring in the composite sealing ring will extend to the inside and outside after being squeezed, and the combination with the test cable and the inner wall of the second channel will be tighter, thereby achieving better water-blocking effect.

[0019] Furthermore, the inner end of the compression lock is a plane, and the outer end is a locking surface formed by grooves and ridges arranged one by one at intervals.

[0020] In the above scheme: the material of the compression lock is alloy steel, and the outer cylindrical surface of the compression lock is threaded for cooperating with the internal thread of the third channel for tightening operation; the inner end of the planar structure is the compression surface, which contacts and fits with the metal sealing ring at the side end of the composite sealing ring, and applies pressure to the composite sealing ring by tightening; a special wrench is used to cooperate with the locking surface for tightening operation, and the special wrench adopts the same structure of grooves and ridges arranged at intervals, and the groove part of the wrench fits with the ridge part of the compression lock; the ridge part adopts a trapezoidal design to ensure that the wrench is more tightly combined with the locking surface when the tightening operation is performed, and there will be no slippage.

[0021] Furthermore, anti-loosening rings made of metal copper are respectively provided at both ends of the conical sealing ring, and a transition ring made of polytetrafluoroethylene is provided between the anti-loosening ring and the conical sealing ring.

[0022] In the above scheme, a conical sealing ring, a pair of transition rings and a pair of anti-loosening rings are installed in the fourth channel (conical cavity), and the inner diameters of the above components are all consistent with the outer diameters of the test cable; the conical sealing ring is made of fluororubber, and its size can be just placed in the conical cavity. After being subjected to pressure, it is squeezed inward and outward, so that the gaps between the test cable and the conical cavity are filled; two transition rings are installed at both ends of the conical sealing ring, and their outer diameters match the minimum inner diameter and the maximum inner diameter of the conical cavity respectively. When resistant to high water pressure, it can ensure that the integrity of the conical sealing ring will not be destroyed while being subjected to the pressure of the tightening bolts; the two anti-loosening rings are respectively installed at the outer sides of the two transition rings, and at the same time, the anti-loosening ring at the inner end contacts the step at the joint of the third and fourth channels, and the anti-loosening ring at the outer end contacts the tightening bolts; copper is a soft metal, and after the anti-loosening ring is subjected to pressure, it can ensure that the transition ring behind it is evenly stressed.

[0023] Furthermore, the inner diameter of the first channel is smaller than the inner diameter of the second channel, that is, a step surface is provided at the joint of the first and second channels, which is convenient for fixing the inner end of the composite sealing ring; the inner diameter of the second channel is smaller than the inner diameter of the third channel, that is, a step surface is provided at the joint of the second and third channels, which is convenient for fixing the inner end of the compression lock; the inner diameter of the third channel is smaller than the minimum inner diameter of the fourth channel, that is, a step surface is provided at the joint of the third and fourth channels, which is convenient for fixing the anti-loosening ring, the transition ring and the conical sealing ring; the maximum inner diameter of the fourth channel is equal to the inner diameter of the fifth channel, which is convenient for the compression bolt to tighten the conical sealing ring, and the inner wall of the fifth channel is provided with an internal thread matching the external thread of the compression bolt.

[0024] Furthermore, the outer side wall of the sealing sleeve corresponding to the fifth channel is provided with an external hexagonal structure, which is convenient for using a wrench or other tools to tighten or loosen the external thread of the sealing sleeve and the internal thread of the test container; the clamping bolt is also provided with an external hexagonal structure, which is convenient for using a wrench or other tools to tighten or loosen the clamping bolt and the fifth channel.

[0025] Furthermore, a protruding large-diameter portion is provided on the external thread surface of the clamping bolt as a limiting structure to prevent the clamping bolt from being over-tightened and causing excessive squeezing of the conical sealing ring.

[0026] The utility model has the following beneficial effects:

[0027] 1. Safety: The test cable passes through the sealing sleeve, composite sealing ring, compression lock, anti-loosening ring, transition ring, conical sealing ring, transition ring, anti-loosening ring in turn, and then is tightened with a compression bolt. The conical sealing ring is made of fluororubber and has a certain elasticity. When the compression bolt is tightened, the conical sealing ring is squeezed; when doing the longitudinal water seepage test, the test cable will be squeezed outward by the water pressure. The two forces can offset each other, effectively preventing the test cable from spraying out during the test.

[0028] 2. Effectiveness: The test container (cylinder) and the sealing sleeve, as well as the sealing sleeve and the clamping bolt are matched through internal and external threads respectively, and then coated with sealing grease to improve the sealing performance.

[0029] 3. Convenience: The device adopts multi-layer water-blocking measures for sealing. Each component is easy to install and does not require other large auxiliary tools.

[0030] 4. Low cost: The relevant sealing components in the device are easy to process. According to the test cables with different outer diameters, only the components matching the size of the test cables need to be replaced: composite sealing ring, anti-loosening ring, transition ring, conical sealing ring, etc., and the material cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an existing water pressure test sealing device in the background technology;

[0032] Figure 2 This is a schematic diagram of the structure of the sealing device of the utility model;

[0033] Figure 3 It is a cross-sectional view of the sealing device of the utility model;

[0034] Figure 4 It is a cross-sectional view of the sealing sleeve in the utility model;

[0035] Figure 5 It is a schematic diagram of the composite sealing ring in the utility model;

[0036] Figure 6 It is a structural schematic diagram of the compression lock in the utility model;

[0037] Figure 7 for Figure 6 A schematic diagram of the compression surface of the middle compression lock;

[0038] Figure 8 It is a schematic diagram of the anti-loosening ring, transition ring and conical sealing ring in the utility model;

[0039] Fig. 9 It is a schematic diagram of the use of the utility model;

[0040] Fig.10 It is a schematic diagram of a special wrench matched with a compression lock in the utility model;

[0041] In the figure: external thread 1, through hole 2, sealing sleeve 3, first channel 3-1, second channel 3-2, third channel 3-3, fourth channel 3-4, fifth channel 3-5, external thread 3-6, external hexagonal structure 3-7, composite sealing ring 4, metal sealing ring 4-1, rubber sealing ring 4-2, clamping lock 5, groove 5-1, convex ridge 5-2, tapered sealing ring 6, clamping bolt 7, external hexagonal structure 7-1, large diameter part 7-2, test cable 8, special wrench 9, grip part 9-1, connecting arm 9-2, working head 9-3, transition ring 10, anti-loosening ring 11. DETAILED DESCRIPTION

[0042] like Figure 2 , 3 As shown, a sealing device for water pressure testing of deep-sea optical cables includes a sealing sleeve 3, a composite sealing ring 4, a compression lock 5, a conical sealing ring 6, and a compression bolt 7.

[0043] like Figure 4As shown, the interior of the sealing sleeve 3 is provided with a channel for the test cable 8 to pass through, and the channel is divided into a first channel 3-1, a second channel 3-2, a third channel 3-3, a fourth channel 3-4, and a fifth channel 3-5 along its axial direction from left to right. The outer side wall of the sealing sleeve corresponding to the first channel is provided with an external thread 3-6 threadedly connected to the test container, and the fourth channel is a truncated cone cavity. The inner diameter of the first channel is smaller than the inner diameter of the second channel, the inner diameter of the second channel is smaller than the inner diameter of the third channel, the inner diameter of the third channel is smaller than the minimum inner diameter of the fourth channel, and the maximum inner diameter of the fourth channel is equal to the inner diameter of the fifth channel.

[0044] The composite sealing ring 4, the compression lock 5, the conical sealing ring 6 and the compression bolt 7 are respectively provided with a central hole for the test cable 8 to pass through.

[0045] The composite sealing ring 4 is installed in the second channel 3-2. Figure 5 As shown, the composite sealing ring 4 is composed of 6 metal sealing rings 4-1 and 5 rubber sealing rings 4-2 arranged one by one, ensuring that a rubber sealing ring is sandwiched between two metal sealing rings. The outer diameter of the rubber sealing ring is larger than the outer diameter of the metal sealing ring, and the inner diameters of the metal sealing ring and the rubber sealing ring are consistent, which is more matched with the outer diameter of the test cable. The overall length of the composite sealing ring is slightly longer than the second channel. The composite sealing ring is compressed using a compression lock. After being squeezed, the rubber sealing ring will extend to both the inside and outside, so that it is more tightly combined with the test cable and the inner wall of the second channel, achieving a better water blocking effect.

[0046] like Figure 6 , 7 As shown, the inner end of the compression lock 5 squeezes the outer end of the composite sealing ring, and its outer cylindrical surface is provided with an external thread, which cooperates with the internal thread of the third channel. The inner end of the compression lock is a plane, which serves as a compression surface, and the outer end of the compression lock is a locking surface formed by grooves 5-1 and convex ridges 5-2 arranged one by one.

[0047] The locking surface of the compression lock 5 is tightened with a special wrench. Fig.10 As shown, the special wrench 9 includes a grip portion 9-1, a connecting arm 9-2, and a working head 9-3. The cross section of the connecting arm 9-2 is arc-shaped, which is convenient for penetrating into the sealing sleeve channel for tightening work. The working head 9-3 adopts the same structure of grooves and ridges arranged at intervals as the locking surface. The groove part of the wrench fits with the ridge part of the compression lock; the ridge 5-2 adopts a trapezoidal design to ensure that the wrench is more tightly combined with the locking surface.

[0048] like Figure 8As shown, a conical sealing ring 6, a pair of transition rings 10 and a pair of anti-loosening rings 11 are installed in the fourth channel 5-4 (conical cavity). The inner diameters of the conical sealing ring 6, the transition ring 10 and the anti-loosening ring 11 are consistent with the outer diameter of the test cable. When the conical sealing ring is subjected to pressure, it is squeezed inward and outward, and the gaps between the test cable and the conical cavity are filled.

[0049] like Figure 3 As shown, the inner end of the clamping bolt 7 squeezes the outer end of the conical sealing ring (anti-loosening ring), and its outer cylindrical surface is provided with an external thread, which is assembled with the internal thread of the fifth channel.

[0050] In one embodiment of the utility model, the outer side wall of the sealing sleeve 3 corresponding to the fifth channel 3-5 is provided with an outer hexagonal structure 3-7, and the clamping bolt 7 is also provided with an outer hexagonal structure 7-1.

[0051] In one embodiment of the present utility model, a protruding large-diameter portion 7-2 is provided on the external thread surface of the clamping bolt 7 to prevent excessive squeezing of the conical sealing ring.

[0052] In one embodiment of the utility model, the sealing sleeve is made of alloy steel, the metal sealing ring is made of metal iron, the compression lock is made of alloy steel, the conical sealing ring is made of fluororubber, the anti-loosening ring is made of metal copper, and the transition ring is made of polytetrafluoroethylene.

[0053] When using, Fig. 9 As shown, a hole is opened on one side of the test container (cylinder) and has an internal thread, and the hole diameter matches the external thread 3-6 (corresponding to the position of the first channel 3-1) at the left end of the sealing sleeve. Specifically:

[0054] First, install the left end of the sealing sleeve 3 on the test container (cylinder) and tighten it with a wrench; then, pass the composite sealing ring 4, the compression lock 5, the anti-loosening ring 11 (small diameter), the transition ring 10 (small diameter), the conical sealing ring 6, the transition ring 10 (large diameter), the anti-loosening ring 11 (large diameter), and the compression bolt 7 to the predetermined position of the test cable 8 in sequence; then, insert the test cable 8 into the sealing sleeve 3, deliver the composite sealing ring 4 to the left end of the second channel 3-2, use a special wrench to tighten the compression lock 5 until it cannot be twisted, install the compression lock 5 in the third channel 3-3, and then apply sealing grease to improve the sealing performance; then, install the anti-loosening ring, transition ring and conical sealing ring into the fourth channel 3-4; finally, install the compression bolt 7, use a wrench to install the compression bolt on the right end of the sealing sleeve, and tighten it until it cannot be twisted. After confirming that all parts are installed in place, you can start pressurizing for water pressure testing.

Claims

1. A sealing device for a deep sea optical cable water pressure test, comprising: A sealing sleeve, wherein a channel for the test cable to pass through is provided inside the sealing sleeve, and the channel is divided into a first channel, a second channel, a third channel, a fourth channel, and a fifth channel in sequence along its axial direction. The outer side wall of the sealing sleeve corresponding to the first channel is provided with an external thread assembled with the test container, and the fourth channel is a truncated cone cavity; A composite sealing ring installed in the second channel; A compression lock, which has a central hole for the test cable to pass through, an inner end of which squeezes the outer end of the composite sealing ring, and an outer cylindrical surface of which is threadedly connected to the inner wall of the third channel; A conical sealing ring installed in the fourth channel; A tightening bolt is provided with a central hole for the test cable to pass through, an inner end of which squeezes the outer end of the conical sealing ring, and an outer cylindrical surface of which is threadedly connected with the inner wall of the fifth channel.

2. A sealing device for water pressure testing of deep sea optical cables according to claim 1, characterized in that: The composite sealing ring is composed of a plurality of metal sealing rings and a plurality of rubber sealing rings arranged one by one at intervals, and the outermost end of the composite sealing ring is the metal sealing ring.

3. A sealing device for water pressure testing of deep sea optical cables according to claim 1 or 2, characterized in that: The inner end of the compression lock is a plane, and the outer end is a locking surface formed by grooves and ridges arranged one by one at intervals.

4. A sealing device for water pressure testing of deep sea optical cables according to claim 1, characterized in that: Anti-loosening rings are respectively arranged at both ends of the conical sealing ring.

5. A sealing device for water pressure testing of deep sea optical cables according to claim 4, characterized in that: A transition ring made of polytetrafluoroethylene is arranged between the anti-loosening ring and the conical sealing ring, and the anti-loosening ring is made of metal copper.

6. A sealing device for water pressure testing of deep sea optical cables according to claim 3, characterized in that: The inner diameter of the first channel is smaller than that of the second channel; the inner diameter of the second channel is smaller than that of the third channel; the inner diameter of the third channel is smaller than the minimum inner diameter of the fourth channel; the maximum inner diameter of the fourth channel is equal to the inner diameter of the fifth channel.

7. The sealing device for water pressure test of deep sea optical cable according to claim 1 is characterized in that: The outer side wall of the sealing sleeve corresponding to the fifth channel is provided with an external hexagonal structure, and the clamping bolt is also provided with an external hexagonal structure.

8. A sealing device for water pressure testing of deep sea optical cables according to claim 1 or 7, characterized in that: A protruding large-diameter portion is provided on the external thread surface of the clamping bolt as a limiting structure.

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