Flexible underwater towing cable flow guide ribbon mounting and fastening device capable of being quickly assembled and disassembled

Abstract

The invention provides a flexible underwater towing cable flow guide ribbon mounting and fastening device capable of being quickly assembled and disassembled. The flexible underwater towing cable flow guide ribbon mounting and fastening device comprises a flexible pipe body, a water-drop-shaped buckle assembly, a guide mechanism and a positioning structure. The flexible pipe body is used for being arranged on an underwater tow cable in a sleeving mode and fixing the flow guide ribbon. The water-drop-shaped buckle assemblies are symmetrically installed at the two ends of the flexible pipe body, and each water-drop-shaped buckle assembly is provided with a proximal end position and a distal end position. The guiding structure guides the drop-shaped buckle assembly to move in the axial direction of the flexible pipe body. The positioning structure is used for fixing the position of the water-drop-shaped buckle assembly. According to the flow guide ribbon installing and fastening device, the water-drop-shaped buckle assembly moves front and back in the axial direction of the flexible pipe body through the guide mechanism, the water-drop-shaped buckle assembly is located at the proximal end position or the telecentric end position through the positioning structure, and therefore clamping or contracting of the water-drop-shaped buckle assembly is achieved, and the effects of being easy to operate and convenient to disassemble and assemble are achieved; water flow longitudinal impact force can be effectively decomposed, transverse water flow is guided to be smoothly transited, and resistance is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of underwater towing cable installation, and in particular relates to an underwater towing cable guide streamer installation and fastening device which is flexible and can be quickly assembled and disassembled. Background Art

[0002] As a key device for suppressing vortex-induced vibration, the underwater towing cable guide streamer significantly improves the stability of the underwater towing system by changing the interaction mechanism between the water flow and the cable body. Its core principle is to use the dynamic buffer interface formed on the outer surface of the streamer to transform the high-speed water flow originally perpendicular to the cable body into a laminar flow distributed along the tangential direction, thereby reducing the direct impact of the water flow on the tow cable, reducing vibration noise and absorbing vortex-induced energy. The current mainstream installation structure is mainly designed based on two major systems: flexible materials and fiber materials. Each solution faces unique technical challenges in engineering practice.

[0003] The flexible material guide streamer system adopts an automatic storage solution with electromechanical linkage, a typical example of which is the patent "An automatic storage system for flexible guide streamers that suppress vibrations". This solution achieves the collection and release of streamers through the coordinated control of sensors and motors, which reduces mechanical damage to the flexible structure while ensuring the operation of the detection equipment. It has the advantages of low cost and extended life. However, its modular splicing structure has significant defects: the segmented connection leads to insufficient overall flexibility, marine sediments are easily accumulated at the joints and accelerate material corrosion, and the complex assembly process increases construction time. More importantly, the rigid end design does not take into account streamline optimization, resulting in increased underwater resistance, and the reliability of the drive motor in a high-pressure seawater environment is still questionable, and there is a risk of system failure.

[0004] The fiber material system has developed three differentiated solutions: tarpaulin, hair, and braided tape. The tarpaulin streamer (patented "a kind of diversion streamer") has attracted attention for its low cost and convenient installation process. It has a good bonding effect with the surface of the tow cable, but the problem of insufficient weather resistance of the material is prominent: long-term immersion leads to structural embrittlement, and microbial film and algae adhere to form a biological fouling layer, which not only reduces the diversion efficiency, but also causes marine pollution after the material is degraded. The hair-type solution realizes integrated integration by directly implanting the streamer into the cable body when weaving the tow cable. Its compact structure has little interference with signal transmission, but the hair group structure becomes an ideal base for biological attachment, accelerating material aging. Even more difficult is the problem of wear and tear of the internal hair, which makes the maintenance cost high. In contrast, the braided tape pasting solution (patented "a kind of pasting diversion mechanism for tow cables") adopts modular bonding technology and avoids the risk of overall failure through a decentralized layout. Its strong bonding interface and good vibration suppression effect are quite advantageous. However, the cured adhesive forms a rigid bond between the ribbon and the cable body, making it difficult to disassemble and recycle it in temporary operation scenarios. This "one-time" characteristic severely limits its application value in short-term tasks.

[0005] In addition, the multi-segment installation scheme proposed in the patent "A vortex-induced vibration suppression device for marine pipelines with streamers" adopts a nested structure of inner and outer cylinders with a bearing system. Although it can achieve segmented control, the complex bolt tightening process significantly increases the installation time. The cylindrical structure has poor adaptability to cable bending and is only suitable for specific scenarios of straight cable laying. These technical bottlenecks together reflect the common difficulties of the current diversion streamer system: how to balance biofouling control, environmental adaptability, maintainability and life cycle cost while ensuring structural reliability, and further reduce directional resistance, which is still a key issue restricting the in-depth application of this technology.

[0006] In summary, in the related art, the guide streamer fixing device of the underwater tow cable has the problems of complex assembly and disassembly, poor drag reduction effect and high operation and maintenance cost. Summary of the invention

[0007] The purpose of the present invention is to solve the structural defects and operation and maintenance problems existing in the prior art. The present invention proposes a flexible and quickly loadable and unloadable underwater towing cable guide streamer installation and fastening device, which can solve the technical problems in the related technology that the guide streamer installation and fastening device is difficult to install and disassemble, has poor drag reduction effect and high operation and maintenance cost.

[0008] To achieve the above purpose, the technical solution provided by the present invention is:

[0009] Provided is a flexible and quickly detachable underwater towing cable guide streamer installation and fastening device, comprising a flexible pipe body, a teardrop-shaped buckle assembly, a guide mechanism and a positioning structure; the flexible pipe body is used to be sleeved on the underwater towing basket with clearance fit and to fix the guide streamer; the teardrop-shaped buckle assemblies are symmetrically mounted at both ends of the flexible pipe body, each teardrop-shaped buckle assembly having a proximal end position close to the center of the flexible pipe body and a distal end position away from the center of the flexible pipe body; the guide structure is used to guide the teardrop-shaped buckle assembly to move axially along the flexible pipe body; the positioning structure is used to position the teardrop-shaped buckle assembly at the proximal end position or the distal end position; when the teardrop-shaped buckle assembly is at the proximal end position, the guide streamer installation and fastening device is locked with the underwater towing basket, and when the teardrop-shaped buckle assembly is at the distal end position, the guide streamer installation and fastening device is unlocked with the underwater towing basket.

[0010] Furthermore, each end of the flexible tube body has two through holes evenly distributed along the circumferential direction; the teardrop-shaped buckle assembly includes two arc plates, an arc-shaped buckle plate, an outer clamping ring and an inner clamping ring; the two arc plates are movably arranged in the two through holes respectively, each arc plate matches the shape of the through hole, and the outer surface of each arc plate has a first arc-shaped slope gradually decreasing from the center of the flexible tube body to the end; the inner surface of each arc-shaped buckle plate has a second arc-shaped slope matching the first arc-shaped slope; the outer clamping ring is used to be sleeved on the ends of the two arc-shaped buckle plates away from the center of the flexible tube body when the two arc-shaped buckle plates are buckled; the inner clamping ring is used to be sleeved on the ends of the two arc-shaped buckle plates close to the center of the flexible tube body when the two arc-shaped buckle plates are buckled.

[0011] Furthermore, the inner clamping ring, the outer clamping ring and the two arc-shaped buckle plates constitute a teardrop-shaped shell with a smooth and continuous outer surface, and the teardrop-shaped shell has a first tapered section that gradually narrows from the middle of the teardrop-shaped shell to an end away from the center of the flexible tube body, and a second tapered section that gradually narrows from the middle of the teardrop-shaped shell to an end close to the center of the flexible tube body; and the contour line slope value of the first tapered section is less than the contour line slope value of the second tapered section.

[0012] Furthermore, each through hole has a third arcuate slope on one side away from the center of the flexible tube body, which is inclined from the outer surface to the inner surface of the flexible tube body; and the arcuate plate has a fourth arcuate slope on one side away from the center of the flexible tube body, which is matched with the third arcuate slope.

[0013] Furthermore, the through hole includes a large rectangular hole and a small rectangular hole located on the side of the large rectangular hole away from the center of the flexible tube body; the arc plate includes a large arc plate and a small arc plate located on the side of the large arc plate away from the center of the flexible tube body.

[0014] Furthermore, the guide structure includes a plurality of guide ribs distributed circumferentially at each end of the flexible tube body, and a guide groove arranged on the inner surface of the arc-shaped buckle plate and matching the guide ribs; wherein each guide rib extends axially and is located on the side of the through hole toward the center of the flexible tube body; and each guide groove extends axially.

[0015] Furthermore, the positioning structure includes a first spherical protrusion axially arranged at the end of the flexible tube body, and two spherical pits axially arranged on the inner surface of the arc-shaped buckle plate and matching with the first spherical protrusion.

[0016] Furthermore, a connecting groove connecting the two spherical pits is provided between the two spherical pits, and the depth of the connecting groove is less than the depth of the spherical pits.

[0017] Furthermore, the inner surface of the arc-shaped plate has a plurality of second spherical protrusions.

[0018] Furthermore, the inclination angle of the first arc-shaped inclined surface is greater than the inclination angle of the fourth arc-shaped inclined surface.

[0019] The advantages of the present invention are:

[0020] The flexible and quickly detachable underwater towing cable guide streamer installation and fastening device designed by the present invention comprises a tube body and two groups of teardrop-shaped buckle assemblies respectively arranged at both ends of the tube body. The flexible tube body can be directly mounted on the underwater towing cable and clamped on the underwater towing cable by two teardrop-shaped buckle assemblies to fix the guide streamer on the underwater towing cable. The teardrop-shaped buckle assembly moves forward and backward along the axial direction of the flexible tube body through a guide mechanism, and the teardrop-shaped buckle assembly is placed in a proximal end position or a distal end position through a positioning structure, converting the lateral movement along the flexible tube body into a contraction or loosening along the longitudinal direction, thereby realizing the locking or unlocking of the guide streamer installation and fastening device. The flexible and quickly detachable underwater towing cable guide streamer installation and fastening device of the present application is easy to operate, convenient to assemble and disassemble, can be reused, can effectively decompose the longitudinal impact force of the water flow and guide the lateral water flow to smoothly transition, and reduce resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The features and advantages of the present invention will become more readily understood through the following description with reference to the accompanying drawings, which are not drawn to scale and in which some features are exaggerated or minimized to show details of particular components:

[0022] Figure 1 It is a structural schematic diagram of the underwater towing cable guide streamer installation and fastening device of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the flexible pipe body of the present invention;

[0024] Figure 3 The present invention Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 It is a schematic structural diagram of a water drop-shaped buckle assembly of the present invention;

[0026] Figure 5 is a cross-sectional view of a water drop-shaped buckle assembly of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the curved plate of the present invention;

[0028] Figure 7 Schematic diagram of the position relationship of the small arc plate on the arc plate of the present invention;

[0029] Figure 8 It is a schematic diagram of the structure of the outer portion of the arc-shaped gusset plate of the present invention;

[0030] Fig. 9 This is a schematic diagram of the structure inside the arc gusset plate of the present invention.

[0031] Fig.10 It is a structural schematic diagram of the outer clamp ring of the present invention;

[0032] Fig.11 It is a structural schematic diagram of the inner snap ring of the present invention;

[0033] Fig.12 is a cross-sectional view of the teardrop-shaped buckle assembly of the present invention in a clamped state;

[0034] Fig.13 is a cross-sectional view of the teardrop-shaped buckle assembly of the present invention in a relaxed state;

[0035] In the figure: 1-underwater drag; 2-external retaining ring; 21-circular arc groove; 3-arc buckle plate; 31-straight groove protrusion; 32-straight groove; 33-guide groove; 34-spherical pit; 35-circular arc protrusion; 36-connecting groove; 37-second arc slope; 4-arc plate; 41-small arc plate; 42-large arc plate; 43-first arc slope; 44-fourth arc slope; 45-second spherical protrusion; 5-inner retaining ring; 6-flexible tube body; 61-guide rib; 62-first spherical protrusion; 63-through hole; 64-third arc slope. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below with reference to the accompanying drawings by means of exemplary embodiments of the present invention. It should be noted that the following detailed description of the present invention is only for the purpose of illustration, and is not intended to limit the present invention.

[0037] In order to solve the structural defects and operation and maintenance problems existing in the prior art, the present invention proposes a flexible and quickly loadable and unloadable underwater tow cable guide streamer installation and fastening device to achieve efficient installation and dynamic adaptation of the underwater tow cable guide streamer.

[0038] like Figure 1 As shown, a flexible and quickly detachable underwater towing cable guide streamer installation and fastening device comprises a flexible pipe body 6, a teardrop-shaped buckle assembly, a guide mechanism and a positioning structure; the flexible pipe body 6 is used to be sleeved on the underwater towing handle 1 with clearance fit and to fix the guide streamer; the teardrop-shaped buckle assembly is symmetrically mounted at both ends of the flexible pipe body 6, and each teardrop-shaped buckle assembly has a proximal end position close to the center of the flexible pipe body 6 and a distal end position away from the center of the flexible pipe body 6; the guide structure is used to guide the teardrop-shaped buckle assembly to move axially along the flexible pipe body 6; the positioning structure is used to position the teardrop-shaped buckle assembly at the proximal end position or the distal end position; when the teardrop-shaped buckle assembly is at the proximal end position, the guide streamer installation and fastening device is locked with the underwater towing handle 1, and when the teardrop-shaped buckle assembly is at the distal end position, the guide streamer installation and fastening device is unlocked with the underwater towing handle 1.

[0039] Realize efficient installation and dynamic adaptation of underwater tow cable guide streamers. The core of the device is to use a flexible sleeve to cover the surface of the underwater tow cable 1 as a whole, and the two ends are equipped with a teardrop-shaped buckle structure that conforms to the principle of fluid mechanics, and a stable connection is formed with the underwater tow cable 1 through a sliding deformation locking mechanism. During installation, it is only necessary to insert the flexible tube body 6 along the axial direction of the cable body and slide the teardrop-shaped buckle assembly along the cable body to complete the fixation. The mechanical lock can be released by reversing the disassembly process, which greatly simplifies the complex assembly or bonding process in the traditional solution. The use of flexible materials not only gives the device excellent bending properties, enabling it to adapt to the multi-directional deformation of the tow cable during underwater operations, but also significantly expands its application range in complex cable laying scenarios.

[0040] In terms of fluid dynamics optimization, the device achieves drag reduction and efficiency improvement through a dual mechanism: the flexible tube body 6 can effectively decompose the longitudinal impact force of the water flow, while the special contour of the teardrop-shaped buckle assembly can guide the lateral water flow to transition smoothly, forming an omnidirectional flow field regulation effect. Compared with the traditional rigid connection or fixed pasting solution, this split design not only avoids the risk of seam corrosion caused by multi-segment splicing, but also solves the problem of rising maintenance costs caused by the difficulty of disassembling the integral structure. More importantly, the reusable loading and unloading characteristics of the flexible sleeve enable it to adapt to the needs of short-term detection missions. After recovery, it can be reused through simple cleaning and maintenance, which fundamentally breaks through the technical bottleneck of the "one-time" use of traditional guide streamers, and provides a new technical path for reducing the operation and maintenance costs of marine equipment and reducing biological pollution.

[0041] like Figure 2 , 3 As shown, each end of the flexible pipe body 6 has two through holes 63 evenly distributed along the circumference; Figure 4 , 5 As shown, the teardrop-shaped buckle assembly includes two arc-shaped plates 4, an arc-shaped buckle plate 3, an outer snap ring 2 and an inner snap ring 5; Figure 5 , 6 As shown, two arc plates 4 are movably disposed in two through holes 63, respectively. Each arc plate 4 matches the shape of the through hole 63, and the outer surface of each arc plate 4 has a first arc slope 43 that gradually decreases from the center to the end of the flexible tube body 6; Figure 5 , 9 As shown, the inner surface of each arc-shaped gusset plate 3 has a second arc-shaped inclined surface 37 matching the first arc-shaped inclined surface 43; Figure 4 As shown, the outer snap ring 2 is used to be sleeved on the ends of the two arc-shaped buckle plates 3 away from the center of the flexible tube body 6 when the two arc-shaped buckle plates 3 are buckled together; the inner snap ring 5 is used to be sleeved on the ends of the two arc-shaped buckle plates 3 close to the center of the flexible tube body 6 when the two arc-shaped buckle plates 3 are buckled together.

[0042] This embodiment provides an underwater towing cable guide streamer installation and fastening device with specific dimensions:

[0043] The total length of the underwater towing guide streamer installation and fastening device is 1m, the outer diameter of the underwater towing 1 is 32mm; the inner diameter of the curved plate 4 is 31.4mm, and the total length is 26.4mm; the inner diameter of the flexible pipe body 6 is 32.5mm, the outer diameter is 36mm, and the total length is 1000mm; the inner diameter of the curved buckle plate 3 is 36mm, the outer diameter (widest part) is 55mm, and the total length is 57.7mm; the inner diameter (smallest end) of the outer retaining ring 2 is 33.4mm, the outer diameter (largest end) is 48.5mm, and the total length is 27mm; the inner diameter of the inner retaining ring 5 is 47mm, the outer diameter (widest part) is 54mm, and the total length is 11mm.

[0044] like Figure 5 , 6 As shown, the contact area between the arc plate 4 and the outer surface of the underwater tow cable 1 is very important, which greatly affects the upper limit of the tension that the teardrop-shaped buckle assembly can provide for the underwater tow cable 1. However, due to the irregular cross-section of the underwater tow cable 1, the contact area between the arc plate 4 and the underwater tow cable 1 is limited, so the lateral length (that is, along the axial direction of the flexible tube body 6) and the rotation angle of the arc plate 4 must be sufficient. The lateral length is related to the length of the connected underwater tow cable 1. The ratio of the sum of the lateral lengths of the two arc plates 4 to the length of the underwater tow cable 1 is greater than 1:20. The arc plate 4 is too narrow to provide sufficient tension. For example, the length of the underwater tow cable 1 is 80 cm, and the sum of the lateral lengths of the two arc plates 4 is at least 2 cm.

[0045] As for the rotation angle, the rotation angle should be large enough so that the two arc plates 4 can wrap the underwater tow cable 1 to prevent it from moving sideways, but it should not be too large. If the rotation angle is too large, the remaining amount of the flexible pipe body 6 after grooving will be too small, the strength will be insufficient, and it will be easy to break. During the movement, the guide streamer installation and fastening device itself will have a considerable normal stress (the user of the 3-meter guide streamer installation and fastening device has a maximum stress of 33N at a speed of 6 knots), so this requires the guide streamer installation and fastening device to have a strong tensile resistance. Use high-strength materials, or avoid longitudinal slicing during 3D printing to reduce the risk of the guide streamer installation and fastening device breaking. This is why the angle at the through hole 63 of the flexible pipe body 6 (the rotation angle of the arc plate 4) cannot be too large. Although a pair of arc plates 4 should wrap the underwater tow cable 1 as much as possible, they still have to ensure a certain strength. The arc rotation angle of the arc plate 4 is 80°-125°. Using high-strength materials, the rotation angle of the arc plate 4 can reach 130 degrees. The specific data can be determined according to the moving speed of the underwater tow cable 1 and the strength of the material used for the flexible tube body 6. For example, if TPU95A soft rubber material is used, at a speed of 3-8 knots, considering the high strength of this material, the rotation angle can be larger but not greater than 125 degrees.

[0046] like Figure 3 , 5As shown in Figures 9, the guide structure includes a plurality of guide ribs 61 distributed circumferentially at each end of the flexible tube body 6, and a guide groove 33 arranged on the inner surface of the arc-shaped buckle plate 3 and matching with the guide ribs 61; wherein each guide rib 61 extends axially and is located on the side of the through hole 63 toward the center of the flexible tube body 6; each guide groove 33 extends axially.

[0047] like Figure 2 , 3 As shown, two through holes 63 are provided and are evenly distributed along the circumference of the flexible tube body 6; multiple guide ribs 61 and first spherical protrusions 62 are provided and are evenly staggered along the circumference of the flexible tube body 6; the guide ribs 61 and the small rectangular holes are both arranged along the axial direction of the flexible tube body 6 and are located on both sides of the through hole 63. In this embodiment, there are 6 groups of first spherical protrusions 62. When the number is increased to 8 or 12 groups, the upper limit of the pulling force can be increased; at the same time, the number of guide ribs 61 is consistent with the number of first spherical protrusions 62. By narrowing the guide ribs 61, more first spherical protrusions 62 can be added.

[0048] like Fig. 9 As shown, a straight groove-shaped protrusion 31 is provided on one radial side wall of the arc-shaped gusset plate 3, and a straight groove-shaped groove 32 matching with the straight groove-shaped protrusion 31 is provided on the other side wall. The two arc-shaped gusset plates 3 are assembled into one body by the straight groove-shaped protrusion 31 and the straight groove-shaped groove 32. Figure 4 As shown, the inner clamping ring 5, the outer clamping ring 2 and the two arc-shaped buckle plates 3 constitute a teardrop-shaped shell with a smooth and continuous outer surface, and the teardrop-shaped shell has a first tapered section that gradually narrows from the middle of the teardrop-shaped shell to the end away from the center of the flexible tube body 6, and a second tapered section that gradually narrows from the middle of the teardrop-shaped shell to the end close to the center of the flexible tube body 6; and the contour line slope value of the first tapered section is less than the contour line slope value of the second tapered section.

[0049] like Figure 1 , 4 As shown, the underwater tow cable 1 moves to the right, and the teardrop-shaped buckle assembly on the left tends to move backward due to the front seawater resistance, but because the arc plate 4 on the left is blocked by the vertical side wall of the through hole 63 in the flexible tube body 6, the force provided by this teardrop-shaped buckle assembly is greater than the friction of the seawater, so the teardrop-shaped buckle assembly on the left cannot move; the teardrop-shaped buckle assembly on the right is subject to the seawater resistance on the back, but the teardrop-shaped shell can greatly reduce the resistance, and the teardrop-shaped buckle assembly can be fixed on the flexible tube body 6 through the positioning structure. When the underwater tow cable 1 moves to the left, the principle is the same as above, and the friction of the seawater can also be overcome, and the fastening effect is good.

[0050] like Figure 3 , 7As shown, each through hole 63 has a third curved slope 64 inclined from the outer surface of the flexible tube body 6 to the inner surface on one side away from the center of the flexible tube body 6; the curved plate 4 has a fourth curved slope 44 matching the third curved slope 64 on one side away from the center of the flexible tube body 6. And the inclination angle of the first curved slope 43 is greater than the inclination angle of the fourth curved slope 44. The slope of the first curved slope 43 where the curved plate 4 contacts the flexible tube body 6 is larger, and 20° is selected in this embodiment. The slope of the fourth curved slope 44 where the curved plate 4 contacts the curved buckle plate 3 is smaller, and 10° is selected in this embodiment.

[0051] like Figure 3 , 6 As shown, the through hole 63 includes a large rectangular hole and a small rectangular hole located on the side of the large rectangular hole away from the center of the flexible tube body 6; the arc plate 4 includes a large arc plate 42 and a small arc plate 41 located on the side of the large arc plate 42 away from the center of the flexible tube body 6. The large arc plate 42 is installed in the large rectangular hole, and the small arc plate 41 is installed in the small rectangular hole.

[0052] like Figure 3 , 9 As shown, the positioning structure includes a first spherical protrusion 62 axially arranged at the end of the flexible tube body 6, and two spherical pits 34 axially arranged on the inner surface of the arc-shaped pinch plate 3 and matching the first spherical protrusion 62. When designing, the distance between the center of the first spherical protrusion 62 and the outer surface of the flexible tube body 6 is controlled between 0 and 1 / 3 of the radius to make it more convex, but the center of the ball cannot be set on the outside, otherwise there will be a risk of breakage.

[0053] The spherical pit 34 on the arc-shaped buckle plate 3 is engaged with the first spherical protrusion 62 on the flexible pipe body 6, so that the teardrop-shaped buckle assembly can be fixed on the flexible pipe body 6 in the proximal position. At this time, the guide streamer installation fastening device is locked with the underwater towing handle 1.

[0054] like Fig. 9 As shown, whether to design a connecting groove 36 between the two spherical pits 34 on the rear annular mounting platform of the arc-shaped gusset plate 3 can be determined according to different degrees of tension requirements. If the distance between the center of the spherical pit 34 and the inner surface of the rear annular mounting platform is less than the radius of the spherical pit 34, there is a connecting groove 36 connecting the two spherical pits 34 between the two spherical pits 34, the groove depth of the connecting groove 36 is less than the depth of the spherical pit 34, and the width of the connecting groove 36 is less than or equal to the diameter of the spherical pit 34; if the distance between the center of the spherical pit 34 and the inner surface of the rear annular mounting platform is greater than the radius of the spherical pit 34, the spherical surface is not particularly protruding, and the connecting groove 36 may not be provided between the two spherical pits 34.

[0055] like Figure 7As shown, the inner surface of the arc plate 4 has a plurality of second spherical protrusions 45 for increasing the friction with the underwater towline 1. When the cross-sectional shape of the underwater towline 1 is slightly irregular, the friction can be appropriately increased by the above structure. If the outer diameters of the underwater towline 1 at various locations measured by a vernier caliper are very close, the second spherical protrusions 45 can be appropriately reduced or even removed. The second spherical protrusions 45 can also be made flatter.

[0056] like Figure 8 As shown, the outer surfaces of the front and rear ends of the arc-shaped gusset plate 3 are respectively provided with a plurality of arc-shaped protrusions 35 evenly arranged along the circumferential direction. Fig.10 , 11 As shown, the inner surfaces of the outer snap ring 2 and the inner snap ring 5 are provided with a plurality of arc-shaped grooves 21 matching the arc-shaped protrusions 35 .

[0057] like Figure 3 As shown, the cross section of the guide rib 61 is an isosceles triangle, and the vertex angle is greater than or equal to 30°, to ensure that it will not age and break. In this embodiment, the cross section of the guide rib 61 is set to be an equilateral triangle.

[0058] Fig.12 , 13 They are cross-sectional views of the teardrop-shaped buckle assembly in the tightened and relaxed states, respectively. From the relaxed state to the tightened state, the flexible tube body 6 moves 2 mm in the radial direction and 8.4 mm in the axial direction.

[0059] The underwater towing cable guide streamer installation and fastening device designed in this embodiment only needs to be inserted into the underwater towing cable 1 and fastened through the water drop-shaped buckle components at both ends, which is simple to operate; and the flexible material is used, with better bending performance and a wider range of applications. The device can be fixed on the underwater towing cable 1 through the water drop-shaped buckle component, and the lateral movement of the flexible tube body 6 is converted into longitudinal contraction or loosening. When moving underwater, the water drop-shaped buckle components at both ends have better drag reduction effects in both the longitudinal (radial) and axial (lateral) directions compared to the traditional basic structural cylinder.

[0060] Finally, it should be noted that the features mentioned and / or shown in the above description of the exemplary embodiments of the present invention may be combined in the same or similar manner into one or more other embodiments, combined with the features in other embodiments or substituted for the corresponding features in other implementations. The technical solutions obtained by these combinations or substitutions shall also be deemed to be included in the protection scope of the present invention.

Claims

1. A flexible and quickly detachable underwater towing cable guide streamer installation and fastening device, characterized in that: include: A flexible pipe body (6) is used to be sleeved on the underwater trolley (1) with clearance fit and to fix the guide streamer; teardrop-shaped buckle assemblies are symmetrically mounted at both ends of the flexible pipe body (6), each of the teardrop-shaped buckle assemblies having a proximal end position close to the center of the flexible pipe body (6) and a distal end position far from the center of the flexible pipe body (6); A guide structure, used for guiding the teardrop-shaped buckle assembly to move axially along the flexible tube body (6); and a positioning structure, used for positioning the teardrop-shaped buckle assembly at the proximal end position or the distal end position; When the teardrop-shaped buckle assembly is at the proximal end position, the guide streamer installation and fastening device is locked with the underwater towing handle (1); when the teardrop-shaped buckle assembly is at the distal end position, the guide streamer installation and fastening device is unlocked with the underwater towing handle (1).

2. The underwater towing cable guide streamer installation and fastening device according to claim 1 is characterized in that: Each end of the flexible pipe body (6) has two through holes (63) evenly distributed along the circumferential direction; The water drop-shaped buckle assembly comprises: Two arc-shaped plates (4), the two arc-shaped plates (4) are movably disposed in the two through holes (63) respectively, each arc-shaped plate (4) matches the shape of the through hole (63), and the outer surface of each arc-shaped plate (4) has a first arc-shaped inclined surface (43) that gradually decreases from the center to the end of the flexible tube body (6); Arc-shaped gusset plates (3), the inner surface of each of the arc-shaped gusset plates (3) having a second arc-shaped inclined surface (37) matching the first arc-shaped inclined surface (43); An outer clamping ring (2) is used to be sleeved on the ends of the two arc-shaped buckle plates (3) away from the center of the flexible pipe body (6) when the two arc-shaped buckle plates (3) are buckled together; And an inner snap ring (5) is used to be sleeved on the ends of the two arc-shaped buckle plates (3) close to the center of the flexible pipe body (6) when the two arc-shaped buckle plates (3) are buckled.

3. The underwater towing cable guide streamer installation and fastening device according to claim 2 is characterized in that: The inner snap ring (5), the outer snap ring (2) and the two arc-shaped buckle plates (3) form a teardrop-shaped outer shell with a smooth and continuous outer surface, and the teardrop-shaped outer shell has a first tapered section that gradually tapers from the middle of the teardrop-shaped outer shell to an end away from the center of the flexible tube body (6), and a second tapered section that gradually tapers from the middle of the teardrop-shaped outer shell to an end close to the center of the flexible tube body (6); and the contour line slope value of the first tapered section is smaller than the contour line slope value of the second tapered section.

4. The underwater towing cable guide streamer installation and fastening device according to claim 2 is characterized in that: Each through hole (63) has a third arcuate slope (64) on one side away from the center of the flexible tube body (6) and inclined from the outer surface of the flexible tube body (6) to the inner surface; and the arcuate plate (4) has a fourth arcuate slope (44) matching the third arcuate slope (64) on one side away from the center of the flexible tube body (6).

5. The underwater towing cable guide streamer installation and fastening device according to claim 2 is characterized in that: The through hole (63) comprises a large rectangular hole and a small rectangular hole located on a side of the large rectangular hole away from the center of the flexible pipe body (6); The arc-shaped plate (4) comprises a large arc-shaped plate (42) and a small arc-shaped plate (41) located on a side of the large arc-shaped plate (42) away from the center of the flexible pipe body (6).

6. The underwater towing cable guide streamer installation and fastening device according to claim 2, characterized in that: The guide structure comprises a plurality of guide ribs (61) distributed along the circumferential direction at each end of the flexible tube body (6), and a guide groove (33) provided on the inner surface of the arc-shaped gusset plate (3) and matching with the guide ribs (61); Wherein, each of the guide ribs (61) extends in the axial direction and is located on a side of the through hole (63) facing the center of the flexible tube body (6); and each of the guide grooves (33) extends in the axial direction.

7. The underwater towing cable guide streamer installation and fastening device according to claim 2, characterized in that: The positioning structure comprises a first spherical protrusion (62) axially arranged at the end of the flexible tube body (6), and two spherical recesses (34) axially arranged on the inner surface of the arc-shaped buckle plate (3) and matching with the first spherical protrusion (62).

8. The underwater towing cable guide streamer installation and fastening device according to claim 7, characterized in that: A connecting groove (36) is provided between the two spherical recesses (34) to connect the two spherical recesses (34), and the groove depth of the connecting groove (36) is smaller than the depth of the spherical recesses (34).

9. The underwater towing cable guide streamer installation and fastening device according to claim 2, characterized in that: The inner surface of the arc-shaped plate (4) has a plurality of second spherical protrusions (45).

10. The underwater towing cable guide streamer installation and fastening device according to claim 4, characterized in that: The inclination angle of the first arc-shaped inclined surface (43) is greater than the inclination angle of the fourth arc-shaped inclined surface (44).

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