High-performance waterproof joint for laying or overhauling underwater cable

Abstract

The invention belongs to the technical field of waterproof joints, and discloses a high-performance waterproof joint for laying or overhauling underwater cables, which comprises a middle body, a connecting ring, a clamping sleeve, a clamping claw and a connector, and is characterized in that the upper end and the lower end of the outer surface of the middle body are respectively in threaded sleeve connection with a packing nut and a bolt; the outer surface of the middle body is movably sleeved with a second sealing ring and a first sealing ring, a through hole and a pressing groove are formed in the packing nut, a containing groove is formed in the middle of the inner wall of the through hole, and a sealing groove is formed in the inner wall of the containing groove. The sealing ring is pressed to generate expansive stretching, transmission fluid reversely applies pressure to the adaptive ring and the third sealing ring to keep the pressing sealing effect of the third sealing ring on the cable, then the communication groove is communicated with seawater, the seawater is combined with the transmission fluid to apply pressure to the third sealing ring in all directions, and the sealing effect of the cable is improved. And through the large-size third sealing ring, the seawater corrosion tolerance can be improved, and the sealing effect is enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of waterproof joints, and in particular relates to a high-performance waterproof joint for laying or repairing underwater cables. Background Art

[0002] Underwater cables refer to cables made of insulating materials, which are generally laid in freshwater or seawater to achieve the transmission function of electrical signals. The underwater environment is very complex. Therefore, after the underwater cables are laid, they will break, corrode and other faults over time, and need to be regularly inspected and maintained. Due to the special underwater environment, the cables generally need to be waterproofed before they can be inspected or laid. Therefore, a high-performance waterproof connector is required.

[0003] At present, high-performance waterproof joints for underwater cable laying or maintenance generally use a clamping nut to press the clamping claw and fix the cable. At the same time, the clamping sleeve is driven to contact closely with the cable by axial bending and pressure on the joint to achieve a sealing and waterproof function. However, this method can only make the joint have a layer of sealing and waterproof defense line. A gap will be generated between the cable and the clamping nut due to the need for relative movement. Therefore, moisture and impurities dissolved therein will enter the inside of the joint along the gap and be free near the contact between the clamping sleeve and the cable. On the one hand, the water pressure will exert pressure on the gap, and the corrosive seawater will corrode the clamping sleeve made of rubber, thereby affecting the reliability of sealing and waterproofing; at the same time, in order not to hinder the installation of the cable, the size of the clamping nut used to fix the cable is generally larger than the cable size, which causes the problem of relative movement between the cable and the clamping nut after installation, which is likely to cause mutual wear between the two and cause cable loss; in addition, since the waterproof joint is placed underwater, it will be affected by water pressure. As the depth increases, the water pressure will gradually increase, which is very likely to open the sealing area of ​​the clamping sleeve. Summary of the invention

[0004] The object of the present invention is to provide a high-performance waterproof joint for underwater cable laying or maintenance to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-performance waterproof joint for underwater cable laying or maintenance, comprising an intermediate body, a connecting ring, a clamping sleeve, a clamping claw and a connecting head, the upper and lower ends of the outer surface of the intermediate body are respectively threadedly sleeved with a clamping nut and a bolt, the outer surface of the intermediate body is movably sleeved with a No. 2 sealing ring and a No. 1 sealing ring, the interior of the clamping nut is respectively provided with a through hole and a pressing groove, the middle of the inner wall of the through hole is provided with a placement groove, the inner wall of the placement groove is provided with a sealing groove, the interior of the sealing groove is movably clamped with a No. 3 sealing ring, the upper side of the inner wall of the sealing groove is provided with a connecting groove, the outer surface of the No. 3 sealing ring is movably sleeved with an adapter ring, the top of the adapter ring is provided with a liquid inlet, the interior of the placement groove is sealed and clamped with a sealing ring, and the interior of the placement groove is filled with transmission fluid.

[0006] Preferably, a protrusion is provided in the middle and lower part of the outer surface of the intermediate body, and the No. 1 sealing ring and the No. 2 sealing ring are respectively located on the upper and lower sides of the protrusion. The inner wall of the intermediate body is fixedly sleeved with a connecting ring and a connecting head distributed up and down, and the top of the connecting ring is fixedly connected with a clamping sleeve, and the outer surface of the clamping sleeve is movably sleeved with a clamping claw, and the through hole and the pressing groove are opened at the top of the inner wall of the clamping nut and are distributed up and down.

[0007] Preferably, the cross-sectional shape of the pressing groove is an "eight" shape, and the top end of the clamping claw can be bent toward the axial direction of the clamping sleeve by being pressed in contact with the pressing groove.

[0008] Preferably, when a cable is movably sleeved on the inner ring surface of the No. 3 sealing ring, the interior of the placement groove is filled with seawater through the connecting groove and the sealing groove.

[0009] Preferably, the upper and lower ends of the sealing ring are in sealing contact with the upper and lower sides of the inner wall of the placement groove respectively, the horizontal cross-section shape of the sealing ring is a spiral line, and the sealing ring is in a state of overlapping head and tail.

[0010] Preferably, the upper and lower ends of the adapter ring are respectively in sealing contact with the upper and lower sides of the inner wall of the placement groove, the inner ring surface of the adapter ring is in sealing contact with the outer ring surface of the No. 3 sealing ring, and the transmission fluid is located in the area between the sealing ring and the adapter ring on the inner wall of the placement groove.

[0011] Preferably, the cross-sectional shape of the connecting groove is a "U" shape after being rotated 180°, and the two ends of the connecting groove are respectively connected to the sealing groove and the placement groove;

[0012] When the No. 3 sealing ring is adapted to be clamped in the interior of the sealing groove, the end of the communicating groove that is in communication with the sealing groove is in a blocked state.

[0013] Preferably, the number of the communicating grooves is eight, and the eight communicating grooves are distributed at equal angles on the upper side of the placement groove with respect to the circumference of the clamping nut.

[0014] Preferably, the diameter of the No. 3 sealing ring is greater than the height of the inner wall of the placement groove, and the No. 3 sealing ring and the adapter ring are both made of rubber blocks.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The present invention arranges the No. 3 sealing ring in the placement groove and the sealing groove in the form of a sealed clamping connection. When the cable is installed, the cable applies pressure to the expansion of the No. 3 sealing ring, so that the No. 3 sealing ring emits an expansion deformation and leaves the interior of the sealing groove, and then expands and moves toward the interior of the placement groove, on the one hand, opening the connecting port between the connecting groove and the sealing groove, and at the same time, by synchronously pressing the adapter ring to drive the transmission fluid to flow, the sealing ring is pressed to produce expansion stretching, and the transmission fluid applies reverse pressure to the adapter ring and the No. 3 sealing ring to maintain the compression and sealing effect of the No. 3 sealing ring on the cable, and then the seawater is connected through the connecting groove, so that the seawater combined with the transmission fluid applies all-round pressure to the No. 3 sealing ring. The large-sized No. 3 sealing ring can improve the tolerance to seawater corrosion and enhance the sealing effect.

[0017] 2. The present invention seals and clamps the No. 3 sealing ring through the sealing groove, and pressurizes the cable to leave the interior of the sealing groove after the cable is installed. When the cable is placed underwater, seawater enters the interior of the placement groove through the gap between the No. 3 sealing ring and the sealing groove, so that the No. 3 sealing ring is subjected to pressure from the transmission fluid and seawater, thereby clamping the cable with limited pressure. On the one hand, the rebound force generated by the elastic deformation of the No. 3 sealing ring is avoided, and at the same time, pressure is applied to the cable to prevent it from shaking, thereby avoiding wear with the inside of the through hole.

[0018] 3. The present invention applies pressure to the sealing ring in the form of flow by the transmission fluid after the No. 3 sealing ring and the adapter ring form expansion deformation, thereby forming a reverse pressure on the cable. By opening a sealing groove and a connecting groove, seawater enters the sealing area between the No. 3 sealing ring and the adapter ring through the connecting groove, thereby reducing the concentrated pressure of seawater on the No. 3 sealing ring and avoiding the formation of a gap between the No. 3 sealing ring and the cable, thereby destroying the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the front appearance of the overall structure of the present invention;

[0020] Figure 2 It is a front cutaway schematic diagram of the overall structure of the present invention;

[0021] Figure 3 For the present invention Figure 2 A magnified schematic diagram of the structure at center A;

[0022] Figure 4It is a schematic diagram of the separation of the intermediate, the No. 1 sealing ring, the No. 2 sealing ring, the bolt, the locking nut, the connecting ring, the clamping sleeve, the clamping claw and the connecting head of the present invention;

[0023] Figure 5 It is a schematic diagram of the separation of the No. 3 sealing ring, the sealing ring and the adapter ring of the present invention;

[0024] Figure 6 It is a schematic diagram of the internal three-dimensional section of the clamping nut of the present invention;

[0025] Figure 7 It is a schematic cross-sectional view of a local state of the clamping nut of the present invention when loading a cable;

[0026] Figure 8 For the present invention Figure 7 A magnified schematic diagram of the structure at B in the figure.

[0027] In the figure: 1, intermediate body; 2, No. 1 sealing ring; 3, No. 2 sealing ring; 4, bolt; 5, clamping nut; 6, connecting ring; 7, clamping sleeve; 8, clamping claw; 9, through hole; 10, pressing groove; 11, No. 3 sealing ring; 12, connecting groove; 13, connecting head; 14, sealing groove; 15, placement groove; 16, sealing ring; 17, adapter ring; 18, liquid inlet; 19, transmission fluid; 20, seawater. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figures 1 to 8 As shown, an embodiment of the present invention provides a high-performance waterproof joint for underwater cable laying or maintenance, including an intermediate body 1, a connecting ring 6, a clamping sleeve 7, a clamping claw 8 and a connector 13, the upper and lower ends of the outer surface of the intermediate body 1 are respectively threadedly sleeved with a clamping nut 5 and a bolt 4, the outer surface of the intermediate body 1 is movably sleeved with a No. 2 sealing ring 3 and a No. 1 sealing ring 2, the interior of the clamping nut 5 is respectively provided with a through hole 9 and a pressing groove 10, a placement groove 15 is provided in the middle of the inner wall of the through hole 9, a sealing groove 14 is provided on the inner wall of the placement groove 15, a No. 3 sealing ring 11 is movably clamped inside the sealing groove 14, a connecting groove 12 is provided on the upper side of the inner wall of the sealing groove 14, an adapter ring 17 is movably sleeved on the outer surface of the No. 3 sealing ring 11, a liquid inlet 18 is provided on the top of the adapter ring 17, a sealing ring 16 is sealed and clamped inside the placement groove 15, and the interior of the placement groove 15 is filled with transmission fluid 19.

[0030] The working principle and beneficial effects of the above technical solution are:

[0031] When the cable is installed, the cable passes downward through the through hole 9 and the pressing groove 10, and the No. 3 sealing ring 11 is evenly stretched and deformed by the through hole 9, so that the No. 3 sealing ring 11 expands toward the inner direction of the placement groove 15, and the No. 3 sealing ring 11 begins to leave the inside of the sealing groove 14, and the connecting groove 12 is connected with the sealing groove 14, and then the clamping nut 5 is rotated and moved downward along the axial direction of the intermediate body 1, and then the clamping claw 8 is pressed downward and bent toward the axial direction of the clamping nut 5, so that the cable is clamped on the one hand, and at the same time, the clamping sleeve 7 is pressed to fit tightly against the cable to complete the internal sealing operation, and then the inner annular surface of the pressed No. 3 sealing ring 11 is in contact with the cable. The outer surface forms a sealing condition through the rebound force. At the same time, the adapter ring 17 is pushed toward the inside of the placement groove 15 to expand and deform the adapter ring 17. The transmission fluid 19 is pressed to flow, so that the sealing ring 16 is expanded and stretched, forming pressure on the inside and outside of the liquid inlet 18. When the cable is placed underwater, seawater 20 enters the inner wall of the placement groove 15 along the gap between the through hole 9 and the No. 3 sealing ring 11, and then enters through the connecting groove 12 and fills the area between the No. 3 sealing ring 11 and the adapter ring 17. The pressure of the No. 3 sealing ring 11 on the cable is balanced by the hydraulic pressure difference between the inside and the outside, making the cable tighter and avoiding wear with the through hole 9.

[0032] The No. 3 sealing ring 11 is arranged in the placement groove 15 and the sealing groove 14 in the form of a sealing clamp. When the cable is installed, the cable exerts pressure on the expansion of the No. 3 sealing ring 11, so that the No. 3 sealing ring 11 emits expansion deformation and leaves the interior of the sealing groove 14, and then expands and moves toward the interior of the placement groove 15, on the one hand, the connecting port between the connecting groove 12 and the sealing groove 14 is opened, and at the same time, the transmission fluid 19 is driven to flow by the synchronous pressing of the adapter ring 17, and the sealing ring 16 is pressed to produce expansion stretching. The transmission fluid 19 applies reverse pressure to the adapter ring 17 and the No. 3 sealing ring 11 to maintain the compression and sealing effect of the No. 3 sealing ring 11 on the cable, and then the seawater 20 is connected through the connecting groove 12, so that the seawater 20 combined with the transmission fluid 19 exerts all-round pressure on the No. 3 sealing ring 11. The large-sized No. 3 sealing ring 11 can improve the tolerance to corrosion by seawater 20 and enhance the sealing effect.

[0033] like Figure 1 , 2 As shown in Figures 4 and 5, in one embodiment, a protrusion is provided at the middle and lower part of the outer surface of the intermediate body 1, and the No. 1 sealing ring 2 and the No. 2 sealing ring 3 are respectively located on the upper and lower sides of the protrusion, and the inner wall of the intermediate body 1 is fixedly sleeved with a connecting ring 6 and a connecting head 13 distributed up and down, and the top of the connecting ring 6 is fixedly connected with a clamping sleeve 7, and the outer surface of the clamping sleeve 7 is movably sleeved with a clamping claw 8, and a through hole 9 and a pressing groove 10 are opened at the top of the inner wall of the clamping nut 5 and are distributed up and down.

[0034] The working principle and beneficial effects of the above technical solution are:

[0035] The clamping sleeve 7 and the clamping claw 8 are both of centripetal symmetrical design. When the clamping nut 5 is threadedly sleeved on the upper side of the outer surface of the intermediate body 1 and moves downward, the top of the clamping claw 8 will contact the pressing groove 10. As the clamping nut 5 moves downward, the clamping claw 8 is gradually pressed by the pressing groove 10 with an inclined surface design and gradually clamps the cable. At the same time, during its bending process, pressure is applied to the clamping sleeve 7 to maintain the clamping sleeve 7, and the internal sealing of the cable can also be achieved by clamping.

[0036] By providing a clamping sleeve 7 and a clamping claw 8 with a centripetal symmetrical design, when the clamping nut 5 is threadedly sleeved on the outer surface of the intermediate body 1 and gradually moves downward, the inclined surface design of the pressing groove 10 contacts the clamping claw 8 and applies pressure to the clamping claw 8, thereby driving the clamping claw 8 to clamp the cable and driving the clamping sleeve 7 to seal the cable in a clamping manner.

[0037] like Figure 2 , 3 As shown in FIGS. 6 , 7 and 8 , in one embodiment, the cross-sectional shape of the pressing groove 10 is an “eight” shape, and the top end of the clamping claw 8 can be bent toward the axial direction of the clamping sleeve 7 by being pressed in contact with the pressing groove 10 .

[0038] The working principle and beneficial effects of the above technical solution are:

[0039] When seawater 20 enters the connecting groove 12 along the gap between the through hole 9 and the No. 3 sealing ring 11, it will enter the area between the No. 3 sealing ring 11 and the adapter ring 17. Since the No. 3 sealing ring 11 and the adapter ring 17 are clamped in the placement groove 15 in a sealed manner, the adapter ring 17 cooperates with the sealing ring 16 in an expanded form to pressurize the transmission fluid 19, so that the transmission fluid 19 can reversely pressurize the adapter ring 17 when it cannot be compressed, so as to keep the internal and external pressures of the adapter ring 17 balanced. The seawater 20 presses the No. 3 sealing ring 11 so that the No. 3 sealing ring 11 exerts balanced pressure on the cable. While maintaining the sealing condition, the outer end of the cable is fixed to avoid wear between it and the inner wall of the through hole 9.

[0040] The sealing groove 14 is provided to seal and clamp the No. 3 sealing ring 11. After the cable is installed, it is pressed to leave the inside of the sealing groove 14. When the cable is placed underwater, seawater 20 enters the inside of the placement groove 15 through the gap between it, the No. 3 sealing ring 11 and the sealing groove 14, so that the No. 3 sealing ring 11 is subjected to the pressure from the transmission fluid 19 and the seawater 20, thereby clamping the cable with limited pressure. On the one hand, the rebound force generated by the elastic deformation of the No. 3 sealing ring 11 is avoided. At the same time, pressure is applied to the cable to prevent it from shaking, thereby avoiding wear with the inside of the through hole 9.

[0041] like Figure 7 ,8 As shown, in one embodiment, when the inner ring surface of the third sealing ring 11 is movably sleeved with a cable, the interior of the placement groove 15 is filled with seawater 20 through the connecting groove 12 and the sealing groove 14 .

[0042] The working principle and beneficial effects of the above technical solution are:

[0043] When the seawater 20 enters the placement groove 15, it will enter the area between the No. 3 sealing ring 11 and the adapter ring 17 through the connecting groove 12, and then completely fill the upper and lower areas of the adapter ring 17 through the liquid inlet 18, and then pressurize the No. 3 sealing ring 11. When the No. 3 sealing ring 11 is compressed to the limit state, hydraulic transmission of sewage is realized, thereby realizing the limit pressure clamping function of the No. 3 sealing ring 11 on the cable.

[0044] like Figure 2 , 3 As shown in FIG. 7 , in one embodiment, the upper and lower ends of the sealing ring 16 are in sealing contact with the upper and lower sides of the inner wall of the placement groove 15 respectively, and the horizontal cross-sectional shape of the sealing ring 16 is a spiral line, and the sealing ring 16 is in an overlapping state.

[0045] The working principle and beneficial effects of the above technical solution are:

[0046] The contact surfaces at both horizontal ends of the sealing ring 16 seal the transmission fluid 19 and the middle area of ​​the inner wall of the placement groove 15 in a sealed form. When the No. 3 sealing ring 11 is expanded by the pressure of the cable, it will drive the adapter ring 17 to expand and deform in the direction of the sealing ring 16, and form pressure on the sealing ring 16 by suppressing the transmission fluid 19, so that after the transmission fluid 19 is suppressed, a reaction force is generated on the adapter ring 17 and the No. 3 sealing ring 11, and the connecting groove 12 is used to allow seawater 20 to enter the interior of the placement groove 15, and the seawater 20 cooperates with the No. 3 sealing ring 11 to pressurize the No. 3 sealing ring 11, so that the gap that may be caused by the hydraulic pressure of the seawater 20 on the No. 3 sealing ring 11 is completely blocked.

[0047] By providing a transmission fluid 19, after the No. 3 sealing ring 11 and the adapter ring 17 form expansion deformation, the sealing ring 16 is pressed in the form of flow, thereby forming a reverse pressure on the cable; by providing a sealing groove 14 and a connecting groove 12, the seawater 20 enters the sealing area between the No. 3 sealing ring 11 and the adapter ring 17 through the connecting groove 12, thereby reducing the concentrated pressure of the seawater 20 on the No. 3 sealing ring 11, avoiding the formation of a gap between the No. 3 sealing ring 11 and the cable, thereby destroying the sealing effect.

[0048] like Figure 2 , 3As shown in FIG. 7 , in one embodiment, the upper and lower ends of the adapter ring 17 are respectively in sealing contact with the upper and lower sides of the inner wall of the placement groove 15, the inner ring surface of the adapter ring 17 is in sealing contact with the outer ring surface of the third sealing ring 11, and the transmission fluid 19 is located in the area between the sealing ring 16 and the adapter ring 17 on the inner wall of the placement groove 15.

[0049] The working principle and beneficial effects of the above technical solution are:

[0050] The adapter ring 17 seals and blocks the transmission fluid 19 by means of sealing and clamping, forming a reverse pressure trend. The No. 3 sealing ring 11 and the adapter ring 17 are connected in the form of limited contact, so that the No. 3 sealing ring 11 and the adapter ring 17 can be adapted when expanded under pressure, thereby improving the sealing performance of the adapter ring 17.

[0051] like Figure 2 , 3 As shown in FIGS. 6 and 7 , in one embodiment, the cross-sectional shape of the connecting groove 12 is a “U” shape after being rotated 180°, and the two ends of the connecting groove 12 are respectively connected to the sealing groove 14 and the placement groove 15;

[0052] When the No. 3 sealing ring 11 is adapted and clamped in the interior of the sealing groove 14 , the end of the communicating groove 12 that is in communication with the sealing groove 14 is in a blocked state.

[0053] The working principle and beneficial effects of the above technical solution are:

[0054] The U-shaped connecting groove 12 will leave the interior of the sealing groove 14 when the No. 3 sealing ring 11 is squeezed by the cable and open the connecting port between the connecting groove 12 and the sealing groove 14 so that it is no longer closed, so that seawater 20 can enter the sealing area between the No. 3 sealing ring 11 and the adapter ring 17 through the connecting groove 12, and the pressure of the seawater 20 on the adapter ring 17 is offset by the transmission fluid 19, and the hydraulic pressure is completely applied to the No. 3 sealing ring 11, thereby forming a high-performance sealing effect when the cable is placed underwater.

[0055] like Figure 2 , 6 As shown in FIG. 7 , in one embodiment, the number of the communicating grooves 12 is eight, and the eight communicating grooves 12 are distributed at equal angles on the upper side of the interior of the placement groove 15 based on the circumferential direction of the locking nut 5 .

[0056] The working principle and beneficial effects of the above technical solution are:

[0057] There are eight connecting grooves 12. On the one hand, the structural strength of the locking nut 5 itself is taken into consideration. Moreover, the seawater 20 is a liquid, and the connecting area can be quickly filled through the connecting grooves 12. The connecting grooves 12 are responsible for connecting the seawater 20 with the internal area of ​​the placement groove 15, mainly forming a pressure diversion of the seawater 20, so that the No. 3 sealing ring 11 has a greater sealing clamping force on the cable.

[0058] like Figure 2 , 3 As shown in FIG. 7 , in one embodiment, the diameter of the No. 3 sealing ring 11 is greater than the height of the inner wall of the placement groove 15 , and the No. 3 sealing ring 11 and the adapter ring 17 are both made of rubber blocks.

[0059] The working principle and beneficial effects of the above technical solution are:

[0060] The No. 3 sealing ring 11 will enter the inner area of ​​the placement groove 15 after being compressed. Therefore, its size is larger than the size of the inner wall of the placement groove 15, thereby forming a sealing effect after extrusion. The No. 3 sealing ring 11 made of rubber material has good corrosion resistance and higher reliability.

[0061] Working principle and usage process:

[0062] When the cable is installed, the cable passes downward through the through hole 9 and the pressing groove 10, and the No. 3 sealing ring 11 is evenly stretched and deformed by the through hole 9, so that the No. 3 sealing ring 11 expands toward the inner direction of the placement groove 15, and the No. 3 sealing ring 11 begins to leave the inside of the sealing groove 14, and the connecting groove 12 is connected with the sealing groove 14, and then the clamping nut 5 is rotated and moved downward along the axial direction of the intermediate body 1, and then the clamping claw 8 is pressed downward and bent toward the axial direction of the clamping nut 5, so that the cable is clamped on the one hand, and at the same time, the clamping sleeve 7 is pressed to fit tightly against the cable to complete the internal sealing operation, and then the inner annular surface of the pressed No. 3 sealing ring 11 is in contact with the cable. The outer surface forms a sealing condition through the rebound force. At the same time, the adapter ring 17 is pushed toward the inside of the placement groove 15 to expand and deform the adapter ring 17. The transmission fluid 19 is pressed to flow, so that the sealing ring 16 is expanded and stretched, forming pressure on the inside and outside of the liquid inlet 18. When the cable is placed underwater, the seawater 20 enters the inner wall of the placement groove 15 along the gap between the through hole 9 and the No. 3 sealing ring 11, and then enters through the connecting groove 12 and fills the area between the No. 3 sealing ring 11 and the adapter ring 17. The pressure of the No. 3 sealing ring 11 on the cable is balanced by the hydraulic pressure difference between the inside and the outside, so that the cable is more tightly fastened to avoid wear with the through hole 9.

[0063] The clamping sleeve 7 and the clamping claw 8 are both of centripetal symmetrical design. When the clamping nut 5 is threadedly sleeved on the upper side of the outer surface of the intermediate body 1 and moves downward, the top of the clamping claw 8 will contact the pressing groove 10. As the clamping nut 5 moves downward, the clamping claw 8 is gradually pressed by the pressing groove 10 with an inclined surface design and gradually clamps the cable. At the same time, during the bending process, the clamping sleeve 7 is pressed to maintain the clamping sleeve 7. The internal sealing of the cable can also be achieved by clamping.

[0064] The contact surfaces at both horizontal ends of the sealing ring 16 seal the transmission fluid 19 and the middle area of ​​the inner wall of the placement groove 15 in a sealed form. When the No. 3 sealing ring 11 is expanded by the pressure of the cable, it will drive the adapter ring 17 to expand and deform in the direction of the sealing ring 16, and form pressure on the sealing ring 16 by suppressing the transmission fluid 19, so that after the transmission fluid 19 is suppressed, a reaction force is generated on the adapter ring 17 and the No. 3 sealing ring 11, and the connecting groove 12 is used to allow seawater 20 to enter the interior of the placement groove 15, and the seawater 20 cooperates with the No. 3 sealing ring 11 to pressurize the No. 3 sealing ring 11, so that the gap that may be caused by the hydraulic pressure of the seawater 20 on the No. 3 sealing ring 11 is completely blocked.

[0065] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0066] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-performance waterproof joint for underwater cable laying or maintenance, comprising an intermediate body (1), a connecting ring (6), a clamping sleeve (7), a clamping claw (8) and a connector (13), wherein the upper and lower ends of the outer surface of the intermediate body (1) are respectively threadedly sleeved with a locking nut (5) and a bolt (4), and the outer surface of the intermediate body (1) is movably sleeved with a second sealing ring (3) and a first sealing ring (2), characterized in that: The interior of the locking nut (5) is respectively provided with a through hole (9) and a pressing groove (10); a placement groove (15) is provided in the middle of the inner wall of the through hole (9); a sealing groove (14) is provided on the inner wall of the placement groove (15); a No. 3 sealing ring (11) is movably clamped inside the sealing groove (14); a connecting groove (12) is provided on the upper side of the inner wall of the sealing groove (14); an adapter ring (17) is movably sleeved on the outer surface of the No. 3 sealing ring (11); a liquid inlet (18) is provided on the top of the adapter ring (17); a sealing ring (16) is sealed and clamped inside the placement groove (15); and the interior of the placement groove (15) is filled with transmission fluid (19).

2. A high-performance waterproof joint for underwater cable laying or maintenance according to claim 1, characterized in that: A protrusion is provided at the middle and lower part of the outer surface of the intermediate body (1), and the No. 1 sealing ring (2) and the No. 2 sealing ring (3) are respectively located at the upper and lower sides of the protrusion. The inner wall of the intermediate body (1) is fixedly sleeved with a connecting ring (6) and a connecting head (13) distributed up and down, and the top of the connecting ring (6) is fixedly connected with a clamping sleeve (7), and the outer surface of the clamping sleeve (7) is movably sleeved with a clamping claw (8), and the through hole (9) and the pressing groove (10) are opened at the top of the inner wall of the clamping nut (5) and are distributed up and down.

3. A high-performance waterproof joint for underwater cable laying or maintenance according to claim 2, characterized in that: The cross-sectional shape of the pressing groove (10) is an "octagonal" shape, and the top end of the clamping claw (8) can be bent toward the axial direction of the clamping sleeve (7) by being in contact with the pressing groove (10) and extruded.

4. A high-performance waterproof joint for underwater cable laying or maintenance according to claim 1, characterized in that: When the inner ring surface of the third sealing ring (11) is movably sleeved with a cable, the interior of the placement groove (15) is filled with seawater (20) through the connecting groove (12) and the sealing groove (14).

5. A high-performance waterproof joint for underwater cable laying or maintenance according to claim 1, characterized in that: The upper and lower ends of the sealing ring (16) are in sealing contact with the upper and lower sides of the inner wall of the placement groove (15) respectively. The horizontal cross-section shape of the sealing ring (16) is a spiral line, and the sealing ring (16) is in a state of overlapping head and tail.

6. A high-performance waterproof joint for underwater cable laying or maintenance according to claim 1, characterized in that: The upper and lower ends of the adapter ring (17) are respectively in sealing contact with the upper and lower sides of the inner wall of the placement groove (15), the inner ring surface of the adapter ring (17) is in sealing contact with the outer ring surface of the third sealing ring (11), and the transmission fluid (19) is located in the area between the sealing ring (16) and the adapter ring (17) on the inner wall of the placement groove (15).

7. A high-performance waterproof joint for underwater cable laying or maintenance according to claim 1, characterized in that: The cross-sectional shape of the connecting groove (12) is a "U" shape after being rotated 180 degrees, and the two ends of the connecting groove (12) are respectively connected to the sealing groove (14) and the placement groove (15); When the third sealing ring (11) is adapted to be snap-fitted into the interior of the sealing groove (14), the end of the connecting groove (12) that is in communication with the sealing groove (14) is in a blocked state.

8. A high-performance waterproof joint for underwater cable laying or maintenance according to claim 1, characterized in that: The number of the communicating grooves (12) is eight, and the eight communicating grooves (12) are distributed at equal angles on the upper side of the interior of the placement groove (15) based on the circumference of the clamping nut (5).

9. A high-performance waterproof joint for underwater cable laying or maintenance according to claim 1, characterized in that: The diameter of the third sealing ring (11) is greater than the height of the inner wall of the placement groove (15), and the third sealing ring (11) and the adapter ring (17) are both made of rubber blocks.

Images