Copper core thermoplastic cable and sealing joint thereof

Abstract

The invention discloses a copper core thermoplastic cable and a sealing joint thereof, and belongs to the technical field of cables, the cable comprises a cable main body, the cable main body comprises a plurality of regularly distributed stranded conductors, the surface of each stranded conductor is provided with a shielding layer for reducing electromagnetic interference, and the surfaces of the plurality of shielding layers are jointly provided with industrial non-woven fabrics; the joint comprises a joint main body sleeving the surface of a cable main body, and the joint main body comprises a male joint and a female joint; through cooperative use of the shielding layer, the industrial non-woven fabric, the filling layer and the protection layer, multiple insulation protection can be achieved, and the cable has the advantages of being resistant to pressure, freezing, water and corrosion and high in protection performance; the female joint is in threaded connection with the male joint and continuously rotates, so that the female joint drives the grasping piece to contract or expand, the effect of compressing or loosening the sealing bush and the joint body is achieved, elastic materials are not needed, and deformation which is difficult to recover due to long-time extrusion of the elastic materials is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a copper core thermoplastic cable and a sealing joint thereof. Background Art

[0002] A cable is an electrical energy or signal transmission device, usually composed of several or several groups of twisted wires. Each group of wires is insulated from each other and often twisted around a center wire, with a highly insulating covering wrapped around the entire structure.

[0003] The existing cables have poor compression resistance. When impacted or squeezed by external forces, the internal conductors are easily bent or deformed or the insulation layer is broken, thereby reducing the reliability and service life of the cables.

[0004] At the same time, when rigid pipes or electrical equipment are connected to cables, sealed joints are required for connection.

[0005] For example, the existing patent document with announcement number CN218850365U discloses an improved cable sealing joint, including a joint body, which is in the shape of a circular tube, and a first outer boss is arranged in the middle part of the outer wall of the joint body along the circumferential direction, a first sealing ring is sleeved on the joint body below the first outer boss, a first inner boss is arranged in the circumferential direction at the lower end of the inner wall of the joint body, a core sleeve is arranged in the joint body, the lower end face of the core sleeve contacts the upper end face of the first inner boss, a second sealing ring is arranged between the core sleeve and the inner wall of the joint body, the upper end of the core sleeve extends upward from the joint body, a cable sealing member is embedded in the inner wall of the upper end of the core sleeve, and the core sleeve and the cable sealing member are connected to each other. The seals are all elastic, the upper and lower ends of the outer wall of the joint body are respectively provided with a first external thread and a second external thread, the upper side of the joint body is provided with a nut body, the lower inner wall of the nut body is provided with an internal thread, the nut body is connected to the joint body through the internal thread and the first external thread, the upper inner wall of the nut body is provided with a second inner boss along the circumferential direction, the lower end face of the second inner boss is provided with a cone, the upper end face of the core sleeve and the upper end face of the cable seal are in contact with the cone, the middle part of the outer wall of the nut body is provided with a second outer boss along the circumferential direction, the upper sleeve of the nut body on the upper side of the second outer boss is provided with a third sealing ring, and the upper end of the outer wall of the nut body is provided with a third external thread. It can connect hard pipes and equipment at the same time, and the cable conductor is protected and sealed by elastic sealing components such as core sleeves, cable seals and sealing rings. Nitrile materials are oil-resistant, and stainless steel materials are corrosion-resistant. It can be used in petrochemical sites, and can be fireproof, explosion-proof, corrosion-resistant, oil-resistant and sealed, with a protection level of IP68. This product has a wide range of uses, is easy to install, can be disassembled and assembled repeatedly, has a low cost of use, and is worthy of promotion.

[0006] Although the above-mentioned improved cable sealing joint can solve the corresponding technical problems, its core sleeve is made of plastic. However, the plastic is deformed and difficult to recover after being squeezed for a long time by the nut body. As a result, in order to ensure the compression effect during later disassembly and maintenance, the core sleeve needs to be replaced, thereby increasing the use cost. Therefore, a copper core thermoplastic cable and its sealing joint are proposed. Summary of the invention

[0007] The technical task of the present invention is to provide a copper core thermoplastic cable and a sealing joint thereof for solving the above-mentioned problems in view of the above-mentioned deficiencies.

[0008] To achieve the above object, the present invention provides the following technical solutions: A copper core thermoplastic cable, comprising a cable body, wherein: The cable body comprises a plurality of regularly distributed twisted conductors, each of which is provided with a shielding layer for reducing electromagnetic interference on its surface, a plurality of shielding layers are provided with an industrial non-woven fabric on their surfaces, a filling layer for filling the gap is provided between the industrial non-woven fabric and the shielding layer, and a protective layer for protecting the filling layer, the industrial non-woven fabric, the shielding layer and the twisted conductor is provided on its surface; The protective layer comprises a pressure-resistant layer which is arranged on the surface of the industrial non-woven fabric and plays a pressure-resistant role, the surface of the pressure-resistant layer is provided with a steel belt armor layer, and the surface of the steel belt armor layer is provided with a sheath; The stranded conductor comprises a circular copper core, the surface of which is tightly surrounded by at least one special-shaped wire layer, and the special-shaped wire layer is composed of a plurality of closely arranged trapezoidal copper cores surrounding the surface of the circular copper core.

[0009] Preferably, the shielding layer comprises a conductor shielding layer fixedly coated on the outer surface of the outermost profiled wire layer, the outer surface of the conductor shielding layer is provided with a silane cross-linked polyethylene insulation layer, the outer surface of the silane cross-linked polyethylene insulation layer is provided with an insulating shielding layer, and the outer surface of the insulating shielding layer is provided with a metal shielding layer; Gaps are formed between the industrial non-woven fabric and the multiple metal shielding layers and between two adjacent metal shielding layers, and the filling layer fills the gaps; The pressure-resistant layer includes an inner isolation layer arranged on the outer surface of the industrial non-woven fabric, an outer isolation layer is arranged on the inner wall surface of the steel belt armor layer, a plurality of first buffer strips equidistantly distributed in an annular shape are fixedly connected to the outer surface of the inner isolation layer, a plurality of second buffer strips equidistantly distributed in an annular shape are fixedly connected to the inner wall surface of the outer isolation layer, the first buffer strips and the second buffer strips are both in arc-shaped cross-sections, the number of the second buffer strips is the same as that of the first buffer strips and they are arranged at intervals, the outer surface of the first buffer strip contacts the inner wall surface of the outer isolation layer, the outer surface of the second buffer strip contacts the outer surface of the inner isolation layer, the inner cavities of the first buffer strip and the second buffer strip are respectively provided with support members, and the steel belt armor layer is arranged on the surface of the outer isolation layer; The support member includes vertical ribs, and reinforcing ribs are integrally formed on both sides of the vertical ribs. The outer surface of the inner isolation layer and the inner wall surface of the first buffer strip are respectively fixedly connected to the corresponding two sides of the vertical ribs, the inner wall surface of the first buffer strip is fixedly connected to one side of the corresponding reinforcing ribs, the inner wall surface of the outer isolation layer and the inner wall surface of the second buffer strip are respectively fixedly connected to the corresponding two sides of the vertical ribs, and the inner wall surface of the second buffer strip is fixedly connected to one side of the corresponding reinforcing ribs.

[0010] The present invention also provides a sealing joint, which is used to achieve the sealing connection between the above-mentioned copper core thermoplastic cable and the hard pipe or equipment, including a joint body sleeved on the surface of the cable body, wherein: The connector body comprises a male connector and a female connector, the inner cavity of the male connector is provided with a sealing bushing for preventing leakage in the gap between the male connector and the cable body, and the male connector is provided with a gripping member for pressing the cable body; The male connector comprises a sleeve, a first rotary sleeve is integrally formed on the surface of the sleeve, and the sealing sleeve is clamped in the inner cavity of the sleeve and contacts the surface of the sleeve; The female joint comprises a screw sleeve threadedly sleeved on one end of the sleeve surface, a second rotary sleeve is integrally formed on the surface of the screw sleeve, an annular cavity is formed between the second rotary sleeve and the sleeve, and the gripping member is located in the annular cavity; The gripping member includes a first wedge block, and a plurality of the first wedge blocks are equidistantly distributed in a ring shape on the surface of the sleeve. A through hole is opened on the sleeve for the first wedge block to pass through, and the inner wall surface of the through hole is slidably connected to the surface of the first wedge block. A second wedge block is movably connected to the surface of each of the first wedge blocks, and a connecting block is fixedly connected between two adjacent second wedge blocks. The inner wall surfaces of the second wedge block and the connecting block are both slidably connected to the surface of the sleeve, a linkage member is provided between the second wedge block and the corresponding first wedge block, and a limit member is provided between the first wedge block and the corresponding through hole.

[0011] Preferably, the linkage member includes a groove opened on the inclined surface of the first wedge block, the inner cavity of the groove is slidably connected with a protrusion, the inclination angle of the groove and the protrusion, and the inclination angle of the inclined surfaces of the first wedge block and the second wedge block are the same, and the protrusion is fixedly connected to the inclined surface of the second wedge block.

[0012] Preferably, the cross-sectional opening size of the groove is smaller than the cross-sectional diameter size of the protrusion.

[0013] Preferably, the limiting member comprises a slide groove opened on one side of the surface of the first wedge block, the inner cavity of the slide groove is slidably connected with a slider, and the slider is fixedly connected to one side of the inner wall surface of the through hole.

[0014] Preferably, the surface of the sleeve away from the end of the threaded sleeve is provided with an external thread, a nut is movably sleeved on the surface of the sleeve, and the inner wall surface of the nut is provided with an internal thread used in conjunction with the external thread.

[0015] Preferably, a first rubber ring gasket is sleeved on the outer surface of the sleeve, one side of the first rubber ring gasket is in contact with the first rotary sleeve, and the other side of the first rubber ring gasket is in contact with the second rotary sleeve.

[0016] Preferably, a second rubber ring gasket having the same structure as the first rubber ring gasket is sleeved on the outer surface of the sleeve, and the second rubber ring gasket is located between the first rotating sleeve and the nut.

[0017] Preferably, a rubber sleeve is embedded in the ends of the sleeve opposite to the threaded sleeve, and the inner wall surface of the rubber sleeve contacts the surface of the protective layer.

[0018] Compared with the prior art, the advantages and positive effects of the present invention are: 1. The present invention can achieve multiple insulation protection through the coordinated use of a shielding layer, an industrial non-woven fabric, a filling layer and a protective layer. It has the advantages of being resistant to pressure, frost, water and corrosion, has strong protective properties, and can effectively reduce the erosion of the natural environment to the cable.

[0019] 2. The present invention combines industrial non-woven fabric with a shielding layer, so that the gaps between the fibers of the industrial non-woven fabric can effectively absorb and disperse electromagnetic interference, thereby ensuring the quality and stability of the cable transmission signal; by combining the industrial non-woven fabric with a filling layer, it can provide additional support and protection, and the mesh structure formed between the fibers of the industrial non-woven fabric can effectively fill the gaps in the filling layer, thereby improving the compression resistance and external force resistance of the cable body. In addition, the elasticity and plasticity of the industrial non-woven fabric can also be closely combined with the shielding layer and the filling layer, thereby improving the mechanical strength and reliability of the cable body; by combining the industrial non-woven fabric with a protective layer, the vibration and impact of the cable body during transportation and installation can be effectively reduced, thereby reducing the risk of damage to the cable body due to external forces; 3. The present invention forms a joint body through a male joint, a female joint, a sealing bushing and a clamping piece. The female joint is screwed onto the male joint and rotated continuously, so that the female joint drives the clamping piece to contract or open, so as to achieve the effect of tightening or loosening the sealing bushing and the joint body. There is no need to use elastic materials, which can prevent the elastic materials from being deformed and difficult to recover due to long-term extrusion, thereby increasing the service life of the sealing joint and reducing the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 Schematic diagram of the structure of a copper core thermoplastic cable according to an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a twisted conductor and a shielding layer of a copper core thermoplastic cable according to an embodiment of the present invention; Figure 3 The copper core thermoplastic cable of the present invention is Figure 1 A schematic diagram of the enlarged structure at A in the middle; Figure 4 This is a schematic structural diagram of the connection state between the sealing joint and the cable body according to an embodiment of the present invention; Figure 5 This is a schematic structural diagram of a sealing joint according to an embodiment of the present invention; Figure 6 It is a schematic diagram of the structure explosion of the sealing joint according to an embodiment of the present invention; Figure 7 It is a schematic diagram of the structure explosion of the male joint and the gripping member of the sealing joint according to the embodiment of the present invention; Figure 8 It is a schematic cross-sectional view of the structure of a joint body of a sealing joint according to an embodiment of the present invention; Fig. 9 It is a schematic cross-sectional view of a local structure of a joint body of a sealing joint according to an embodiment of the present invention; Fig.10 The sealing joint of the embodiment of the present invention Figure 8 A schematic diagram of the enlarged structure at B in the middle; Fig.11 It is a structural schematic diagram of a male joint of a sealing joint according to an embodiment of the present invention; Fig.12 It is a schematic structural diagram of the second wedge block and the protrusion of the sealing joint according to an embodiment of the present invention.

[0022] In the figure: 100, cable body; 110, stranded conductor; 111, round copper core; 112, trapezoidal copper core; 120, shielding layer; 121, conductor shielding layer; 122, silane cross-linked polyethylene insulation layer; 123, insulation shielding layer; 124, metal shielding layer; 130, industrial non-woven fabric; 140, filling layer; 150, protective layer; 151, pressure-resistant layer; 1511, inner isolation layer; 1512, outer isolation layer; 1513, first buffer strip; 1514, second buffer strip; 1515, support member; 15151, vertical rib; 15152, reinforcing rib; 152, steel belt armor layer; 153, sheath; 200, connector body; 210, male connector; 211, sleeve; 2111, through hole; 212, first rotary sleeve; 220, female connector; 221, screw sleeve; 222, second rotary sleeve; 230, sealing bushing; 240, gripping member; 241, first wedge block; 242, second wedge block; 243, connecting block; 244, groove; 245, protrusion; 246, slide groove; 247, slider; 300, nut; 400, first rubber ring gasket; 500, second rubber ring gasket; 600, rubber sleeve. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Embodiment 1, as Figure 1-Figure 3 As shown, a copper core thermoplastic cable according to an embodiment of the present invention includes a cable body 100, and the cable body 100 includes a plurality of regularly distributed twisted conductors 110, and a shielding layer 120 for reducing electromagnetic interference is respectively provided on the surface of each twisted conductor 110, and an industrial non-woven fabric 130 is commonly provided on the surfaces of the plurality of shielding layers 120, and a filling layer 140 for filling the gap is provided between the industrial non-woven fabric 130 and the shielding layer 120, and the filling layer 140 is made of flame-retardant filling rope, and a protective layer 150 for protecting the filling layer 140, the industrial non-woven fabric 130, the shielding layer 120 and the twisted conductor 110 is provided on the surface of the industrial non-woven fabric 130; the protective layer 150 includes a pressure-resistant layer 151 provided on the surface of the industrial non-woven fabric 130 and having a pressure-resistant effect, and a steel belt armor layer 152 is provided on the surface of the pressure-resistant layer 151, and a sheath 153 is provided on the surface of the steel belt armor layer 152, and both the pressure-resistant layer 151 and the sheath 153 are made of TPE material.

[0026] Among them, the twisted conductor 110 includes a circular copper core 111, and the surface of the circular copper core 111 is tightly surrounded by at least one special-shaped wire layer, and the special-shaped wire layer is composed of a number of closely arranged trapezoidal copper cores 112 surrounding the surface of the circular copper core 111. The circular copper core 111 and the trapezoidal copper core 112 are both oxygen-free copper cores, which have the advantages of low eccentricity and high conductivity. The trapezoidal copper core 112 adopts a special-shaped conductor process, which can reduce the gap between the twisted conductors, make the conductors more compact, and effectively reduce the resistivity.

[0027] Among them, the shielding layer 120 includes a conductor shielding layer 121 fixedly coated on the outer surface of the outermost special-shaped wire layer, the outer surface of the conductor shielding layer 121 is provided with a silane cross-linked polyethylene insulation layer 122, the outer surface of the silane cross-linked polyethylene insulation layer 122 is provided with an insulating shielding layer 123, and the outer surface of the insulating shielding layer 123 is provided with a metal shielding layer 124. The conductor shielding layer 121 is made of a graphene shielding material, the insulating shielding layer 123 is a cross-linked semi-conductive layer, and the metal shielding layer 124 is composed of copper wires sparsely wound on the outer surface of the insulating shielding layer 123 and copper tapes wrapped in gaps. The shielding layer 120 can prevent electromagnetic noise interference and protect the signal from interference; based on the shielding effect of the electromagnetic field, it absorbs or reflects external electromagnetic waves to reduce electromagnetic interference; eliminates the unevenness, tip effect and pores on the conductor surface and improves the electric field distribution; for cross-linked cables, it also has the effect of inhibiting the growth of electric trees and heat shielding; plays a certain grounding protection role, and the leakage current can flow to the grounding grid to improve safety.

[0028] Among them, gaps are formed between the industrial non-woven fabric 130 and the multiple metal shielding layers 124, and between two adjacent metal shielding layers 124, and the filling layer 140 fills the gaps. The filling layer 140 can fill the gaps to maintain the stability of the internal structure of the copper core thermoplastic cable. At the same time, it can be used in conjunction with the silane cross-linked polyethylene insulation layer 122 to play a flame retardant role, so that the copper core thermoplastic cable will not spread when encountering fire, and the fire will be extinguished instantly when leaving the fire. It is resistant to high temperature and corrosion, and is safer to use electricity.

[0029] Among them, the pressure-resistant layer 151 includes an inner isolation layer 1511 arranged on the outer surface of the industrial non-woven fabric 130, an outer isolation layer 1512 is arranged on the inner wall surface of the steel belt armor layer 152, a plurality of first buffer strips 1513 distributed in an annular shape and equidistantly are fixedly connected to the outer surface of the inner isolation layer 1511, a plurality of second buffer strips 1514 distributed in an annular shape and equidistantly are fixedly connected to the inner wall surface of the outer isolation layer 1512, the cross-sections of the first buffer strips 1513 and the second buffer strips 1514 are both arc-shaped structures, the number of the second buffer strips 1514 and the first buffer strips 1513 are the same and are arranged at intervals, the outer surface of the first buffer strip 1513 contacts the inner wall surface of the outer isolation layer 1512, the outer surface of the second buffer strip 1514 contacts the outer surface of the inner isolation layer 1511, the inner cavities of the first buffer strip 1513 and the second buffer strip 1514 are respectively provided with support members 1515, and the steel belt armor layer 152 is arranged on the surface of the outer isolation layer 1512.

[0030] The support member 1515 includes a vertical rib 15151, and both sides of the vertical rib 15151 are integrally formed with a reinforcing rib 15152. The outer surface of the inner isolation layer 1511 and the inner wall surface of the first buffer strip 1513 are respectively fixedly connected to the corresponding two sides of the vertical rib 15151, and the inner wall surface of the first buffer strip 1513 is fixedly connected to one side of the corresponding reinforcing rib 15152. The inner wall surface of the outer isolation layer 1512 and the inner wall surface of the second buffer strip 1514 are respectively fixedly connected to the corresponding two sides of the vertical rib 15151, and the inner wall surface of the second buffer strip 1514 is respectively fixedly connected to the corresponding two sides of the vertical rib 15151. The inner wall surface of the punch bar 1514 is fixedly connected to one side of the corresponding reinforcement rib 15152. The support member 1515 can form a branch-like structure inside the first buffer bar 1513 and the second buffer bar 1514, so that when the surface of the protective layer 150 is subjected to external force, the support member 1515 can support the anti-pressure layer 151, so that the anti-pressure layer 151 is not easy to collapse. It has the advantage of strong impact resistance, plays a good buffering role, and improves the bending resistance and ring stiffness of the copper core thermoplastic cable.

[0031] Working principle: The support member 1515 can form a branch-like structure inside the first buffer strip 1513 and the second buffer strip 1514, so that when the surface of the protective layer 150 is subjected to external force, the support member 1515 can support the anti-pressure layer 151, making it difficult for the anti-pressure layer 151 to collapse, thereby increasing the bending resistance of the protective layer 150, having the advantage of strong impact resistance, playing a good buffering role, and improving the bending resistance and ring stiffness of the copper core thermoplastic cable.

[0032] Embodiment 2, as Figure 4-Figure 12As shown, a sealing joint provided in this embodiment is used to achieve a sealed connection between the above-mentioned copper core thermoplastic cable and the hard pipe or equipment, including a joint body 200 sleeved on the surface of the cable body 100, the joint body 200 includes a male joint 210 and a female joint 220, the inner cavity of the male joint 210 is provided with a sealing bushing 230 for preventing leakage in the gap between the male joint 210 and the cable body 100, and the male joint 210 is provided with a gripping member 240 for pressing the cable body 100; the male joint 210 includes The sleeve 211 has a first rotary sleeve 212 integrally formed on the surface of the sleeve 211 for convenient hand force bearing, and the sealing bushing 230 is clamped in the inner cavity of the sleeve 211 and contacts the surface of the sheath 153; the female connector 220 includes a screw sleeve 221 threadedly sleeved on one end of the sleeve 211 surface, and the surface of the screw sleeve 221 has a second rotary sleeve 222 integrally formed on the surface of the screw sleeve 221 for convenient hand force bearing, and an annular cavity is formed between the second rotary sleeve 222 and the sleeve 211, and the gripping member 240 is located in the annular cavity, so that when the female connector 220 is connected to the male connector 210, the second rotary sleeve 222 is The rotating sleeve 222 can shield the gripping member 240, effectively improving the integrity and sealing of the sealing joint; the gripping member 240 includes a first wedge block 241, and a plurality of first wedge blocks 241 are distributed in an annular manner and equidistantly on the surface of the sleeve 211. The sleeve 211 is provided with a through hole 2111 for the first wedge block 241 to pass through. The inner wall surface of the through hole 2111 is slidably connected to the surface of the first wedge block 241, and each surface of each first wedge block 241 is movably connected to a second wedge block 242, and two adjacent second wedge blocks 241 are movably connected to each other. A connecting block 243 is fixedly connected between the wedge blocks 242, and the inner wall surfaces of the second wedge blocks 242 and the connecting block 243 are both slidably connected to the surface of the sleeve 211, a linkage piece is provided between the second wedge blocks 242 and the corresponding first wedge blocks 241, and a limit piece is provided between the first wedge blocks 241 and the corresponding through hole 2111, so that a circular ring structure that can move on the surface of the sleeve 211 along its axial direction is formed between the several second wedge blocks 242 and the connecting blocks 243, which is convenient for driving the several first wedge blocks 241 to move synchronously.

[0033] Among them, the linkage part includes a groove 244 opened on the inclined surface of the first wedge block 241, and the inner cavity of the groove 244 is slidably connected with a protrusion 245. The inclination angles of the groove 244 and the protrusion 245 are the same as the inclination angles of the inclined surfaces of the first wedge block 241 and the second wedge block 242. The protrusion 245 is fixedly connected to the inclined surface of the second wedge block 242. When the second wedge block 242 moves, the first wedge block 241 can be driven to move synchronously through the linkage part. By using the inclined surface structures on the first wedge block 241 and the second wedge block 242 and the inclined groove 244 and the protrusion 245, the force direction can be changed, so that the front-to-back direction and the left-to-right direction can be converted to each other, so that a plurality of first wedge blocks 241 can be contracted or opened to achieve the compression or loosening effect on the sealing bushing 230 and the cable body 100.

[0034] Among them, the cross-sectional opening size of the groove 244 is smaller than the cross-sectional diameter size of the protrusion 245, which can effectively prevent the protrusion 245 from slipping out of the inner cavity of the groove 244, so that the second wedge block 242 and the first wedge block 241 can always remain in an active connection state.

[0035] Among them, the limiting member includes a slide groove 246 opened on one side of the surface of the first wedge block 241, and the inner cavity of the slide groove 246 is slidably connected with a slider 247, and the slider 247 is fixedly connected to one side of the inner wall surface of the through hole 2111. When the first wedge block 241 moves toward or away from the sealing sleeve 230, it can drive the slide groove 246 to move synchronously, so that the slider 247 can slide in the inner cavity of the slide groove 246, thereby improving the stability of the first wedge block 241 when moving.

[0036] Among them, the surface of the sleeve 211 away from the end of the threaded sleeve 221 is provided with an external thread, and the surface of the sleeve 211 is movably sleeved with a nut 300. The inner wall surface of the nut 300 is provided with an internal thread used in conjunction with the external thread. The sealing joint can be screwed to the hard pipe through the external thread on the sleeve 211. By passing the sleeve 211 through the surface of the equipment, and then screwing the nut 300 onto the sleeve 211 and tightening it, the sealing joint can be connected to the equipment, so that the sealing joint can be suitable for hard pipes and equipment.

[0037] Among them, the outer surface of the sleeve 211 is provided with a first rubber ring gasket 400, one side of the first rubber ring gasket 400 is in contact with the first rotary sleeve 212, and the other side of the first rubber ring gasket 400 is in contact with the second rotary sleeve 222. The first rubber ring gasket 400 can effectively prevent leakage from occurring in the gap between the sleeve 211 and the second rotary sleeve 222.

[0038] Among them, the outer surface of the sleeve 211 is also provided with a second rubber ring gasket 500 with the same structure as the first rubber ring gasket 400. The second rubber ring gasket 500 is located between the first rotary sleeve 212 and the nut 300. The second rubber ring gasket 500 can effectively avoid the wear caused by the first rotary sleeve 212 directly contacting the hard pipe or equipment, and can also prevent leakage from the gap between the sleeve 211 and the hard pipe, or the sleeve 211 and the equipment.

[0039] Among them, a rubber sleeve 600 is embedded in the opposite ends of the sleeve 211 and the threaded sleeve 221, and the inner wall surface of the rubber sleeve 600 contacts the surface of the protective layer 150. The rubber sleeve 600 can improve the sealing between the male connector 210 and the protective layer 150, and the female connector 220 and the protective layer 150, thereby further improving the sealing of the sealing joint.

[0040] Specifically, in this embodiment, it is very important to ensure the airtightness and waterproofness of the sealed joint, and the continuity equation and Navier-Stokes equation in fluid mechanics can be used to analyze the flow behavior of liquid or gas in the joint gap.

[0041] Continuity equation: ; in: ρ: density of the fluid (unit: kg / m 3 ); t: time (unit: s); u: velocity vector of fluid (unit: m / s); The divergence of mass flux represents the net outflow rate of mass per unit volume; It is worth noting that in incompressible fluids (such as liquids or low-speed gases), the density ρ is a constant and the equation is simplified to: ; In this case, the equation only needs the velocity vector u as a parameter, indicating that the fluid has no net mass source or sink in space; Navier-Stokes equations: in: p is pressure, which indicates the static pressure inside the fluid, unit: Pa (N / m²), and its function is pressure gradient Drive fluid from high pressure area to low pressure area; μ is the dynamic viscosity, which indicates the ability of the fluid to resist shear deformation and reflects the magnitude of viscous resistance. The unit is Pa·s (or kg / (m·s)). It acts as a viscosity term. Describes momentum diffusion caused by fluid viscosity; f is the volume force, which is the external force acting on the unit volume of the fluid (such as gravity, electromagnetic force, etc.), unit: N / m³; ρ is the mass density of the fluid, which represents the mass of the fluid per unit volume (unit: kg / m 3 ), which reflects the inertial characteristics of the fluid. The greater the density, the stronger the inertia; u is the velocity vector, which represents the velocity vector field of the fluid micro-group in space, unit: m / s; is the local acceleration (acceleration due to time variation); t is time (unit: s); is the convective acceleration (acceleration caused by the spatial velocity gradient).

[0042] The above equation can be used to predict the leakage risks that may occur under various working conditions, which helps to improve the design of the sealing bushing 230 and the rubber ring gasket and improve the overall sealing performance of the joint.

[0043] Working principle: S1. Connect the male connector 210 to a hard pipe or device: When connecting to a hard pipe, insert the sleeve 211 into the end of the hard pipe, and use the first rotary sleeve 212 to rotate the sleeve 211. Under the action of the thread, the sleeve 211 is gradually screwed into the end of the hard pipe until the second rubber ring gasket 500 is tightly attached to the hard pipe and the first rotary sleeve 212. When connecting to a device, insert the sleeve 211 into the mounting hole of the device, and then sleeve the nut 300 on the end of the sleeve 211 and rotate it. Under the action of the thread, the nut 300 is gradually moved toward the direction of the first rotary sleeve 212 until the nut 300 moves to the maximum limit, so that the second rubber ring gasket 500 is tightly attached to the surface of the device, and the fixing operation of the male connector 210 is completed; S2. Preliminary connection of the cable body 100 and the connector body 200: The end of the cable body 100 is sequentially passed through one of the rubber sleeves 600, the female connector 220, the male connector 210, the sealing bushing 230 and the inner cavity of the other rubber sleeve 600, so that the end of the cable body 100 is inserted into the interior of the hard pipe or device, and the preliminary connection operation of the cable body 100 and the connector body 200 is completed; S3. Connect the cable body 100 and the connector body 200 again: align the screw sleeve 221 with the end of the sleeve 211, and use the second screw sleeve 222 to rotate the screw sleeve 221. Under the action of the thread, the screw sleeve 221 is gradually rotated to the surface of the sleeve 211, so that the gripping member 240 gradually enters the inner cavity of the second screw sleeve 222. When the screw sleeve 221 moves a certain distance on the surface of the sleeve 211, the screw sleeve 221 pushes the second wedge block 242, so that the second wedge block 242 moves toward the first wedge block 241. The second wedge block 242 applies pressure to the first wedge block 241, and the second wedge block 242 drives the protrusion 245 to slide in the inner cavity of the groove 244, so that the first wedge block 241 gradually moves toward the inner cavity of the sleeve 211, and the first wedge block 241 drives the protrusion 245 to slide in the inner cavity of the groove 244. The slide groove 246 moves, so that the slider 247 slides in the inner cavity of the slide groove 246, and then the first wedge block 241 gradually squeezes the sealing bushing 230, so that the sealing bushing 230 fits tightly to the surface of the cable body 100, which can not only realize the gripping operation of the cable body 100 and prevent the cable body 100 from loosening from the inner cavity of the connector body 200 due to the pulling of external forces, but also make the sealing bushing 230 fit tightly to the surface of the cable body 100, effectively improving the air tightness between the connector body 200 and the cable body 100, until the screw sleeve 221 moves to the maximum limit, at which time the two sides of the first rubber ring gasket 400 are in close contact with the first rotary sleeve 212 and the second rotary sleeve 222 respectively, and the reconnection operation of the cable body 100 and the connector body 200 can be completed.

[0044] Through the above specific implementations, those skilled in the art can easily implement the present invention. However, it should be understood that the present invention is not limited to the above specific implementations. On the basis of the disclosed implementations, those skilled in the art can arbitrarily combine different technical features to achieve different technical solutions.

Claims

1. A copper core thermoplastic cable, characterized in that: It comprises a cable body (100), wherein: The cable body (100) comprises a plurality of regularly distributed twisted conductors (110), each of the twisted conductors (110) being provided with a shielding layer (120) for reducing electromagnetic interference on its surface, an industrial non-woven fabric (130) being provided on the surfaces of the plurality of shielding layers (120), a filling layer (140) being provided between the industrial non-woven fabric (130) and the shielding layer (120) for filling a gap, and a protective layer (150) being provided on the surface of the industrial non-woven fabric (130) for protecting the filling layer (140), the industrial non-woven fabric (130), the shielding layer (120) and the twisted conductors (110); The protective layer (150) comprises a pressure-resistant layer (151) provided on the surface of the industrial non-woven fabric (130) and having a pressure-resistant function, a steel belt armor layer (152) being provided on the surface of the pressure-resistant layer (151), and a sheath (153) being provided on the surface of the steel belt armor layer (152); The stranded conductor (110) comprises a circular copper core (111), the surface of the circular copper core (111) being tightly surrounded by at least one special-shaped wire layer, the special-shaped wire layer being composed of a plurality of closely arranged trapezoidal copper cores (112) surrounding the surface of the circular copper core (111).

2. The copper core thermoplastic cable according to claim 1, characterized in that: The shielding layer (120) comprises a conductor shielding layer (121) fixedly coated on the outer surface of the outermost profiled wire layer, the outer surface of the conductor shielding layer (121) is provided with a silane cross-linked polyethylene insulation layer (122), the outer surface of the silane cross-linked polyethylene insulation layer (122) is provided with an insulation shielding layer (123), and the outer surface of the insulation shielding layer (123) is provided with a metal shielding layer (124); Gaps are formed between the industrial non-woven fabric (130) and the plurality of metal shielding layers (124) and between two adjacent metal shielding layers (124), and the filling layer (140) fills the gaps; The pressure-resistant layer (151) comprises an inner isolation layer (1511) disposed on the outer surface of the industrial non-woven fabric (130); the inner wall surface of the steel belt armor layer (152) is provided with an outer isolation layer (1512); the outer surface of the inner isolation layer (1511) is fixedly connected to a plurality of first buffer strips (1513) distributed in an annular manner and at equal intervals; the inner wall surface of the outer isolation layer (1512) is fixedly connected to a plurality of second buffer strips (1514) distributed in an annular manner and at equal intervals; the cross-sections of the first buffer strips (1513) and the second buffer strips (1514) are Both are arc-shaped structures, the number of the second buffer strips (1514) and the first buffer strips (1513) is the same and they are arranged at intervals, the outer surface of the first buffer strip (1513) contacts the inner wall surface of the outer isolation layer (1512), the outer surface of the second buffer strip (1514) contacts the outer surface of the inner isolation layer (1511), the inner cavities of the first buffer strip (1513) and the second buffer strip (1514) are respectively provided with support members (1515), and the steel belt armor layer (152) is arranged on the surface of the outer isolation layer (1512); The support member (1515) comprises a vertical rib (15151), and both sides of the vertical rib (15151) are integrally formed with a reinforcing rib (15152); the outer surface of the inner isolation layer (1511) and the inner wall surface of the first buffer strip (1513) are respectively fixedly connected to the two sides of the corresponding vertical rib (15151); the inner wall surface of the first buffer strip (1513) is fixedly connected to one side of the corresponding reinforcing rib (15152); the inner wall surface of the outer isolation layer (1512) and the inner wall surface of the second buffer strip (1514) are respectively fixedly connected to the two sides of the corresponding vertical rib (15151); and the inner wall surface of the second buffer strip (1514) is fixedly connected to one side of the corresponding reinforcing rib (15152).

3. A sealing joint, used to achieve a sealed connection between the copper core thermoplastic cable according to any one of claims 1 or 2 and a hard pipe or equipment, characterized in that: It comprises a connector body (200) sleeved on the surface of a cable body (100), wherein: The connector body (200) comprises a male connector (210) and a female connector (220); the inner cavity of the male connector (210) is provided with a sealing bushing (230) for preventing leakage from occurring in the gap between the male connector (210) and the cable body (100); and the male connector (210) is provided with a gripping member (240) for pressing the cable body (100); The male connector (210) comprises a sleeve (211), a first rotary sleeve (212) is integrally formed on the surface of the sleeve (211), and the sealing sleeve (230) is clamped in the inner cavity of the sleeve (211) and contacts the surface of the sheath (153); The female connector (220) comprises a screw sleeve (221) threadedly sleeved on one end of the surface of the sleeve (211), a second screw sleeve (222) being integrally formed on the surface of the screw sleeve (221), an annular cavity being formed between the second screw sleeve (222) and the sleeve (211), and the gripping member (240) being located in the annular cavity; The gripping member (240) comprises a first wedge block (241), wherein a plurality of the first wedge blocks (241) are equidistantly distributed in a ring shape on the surface of the sleeve (211), and a through hole (2111) is provided on the sleeve (211) for the first wedge block (241) to pass through, and an inner wall surface of the through hole (2111) is slidably connected to the surface of the first wedge block (241), and a second wedge block (242) is movably connected to the surface of each of the first wedge blocks (241), and a connecting block (243) is fixedly connected between two adjacent second wedge blocks (242), and the inner wall surfaces of the second wedge block (242) and the connecting block (243) are both slidably connected to the surface of the sleeve (211), a linkage member is provided between the second wedge block (242) and the corresponding first wedge block (241), and a limit member is provided between the first wedge block (241) and the corresponding through hole (2111).

4. The sealing joint according to claim 3, characterized in that: The linkage member comprises a groove (244) formed on the inclined surface of the first wedge-shaped block (241); a protrusion (245) is slidably connected to the inner cavity of the groove (244); the inclination angles of the groove (244) and the protrusion (245) are the same as the inclination angles of the inclined surfaces of the first wedge-shaped block (241) and the second wedge-shaped block (242); and the protrusion (245) is fixedly connected to the inclined surface of the second wedge-shaped block (242).

5. The sealing joint according to claim 4, characterized in that: The cross-sectional opening size of the groove (244) is smaller than the cross-sectional diameter size of the protrusion (245).

6. The sealing joint according to claim 3, characterized in that: The limiting member comprises a slide groove (246) formed on one side of the surface of the first wedge block (241); the inner cavity of the slide groove (246) is slidably connected to a slider (247); and the slider (247) is fixedly connected to one side of the inner wall surface of the through hole (2111).

7. The sealing joint according to claim 3, characterized in that: An external thread is provided on the surface of the sleeve (211) at one end away from the screw sleeve (221), a nut (300) is movably sleeved on the surface of the sleeve (211), and an internal thread that cooperates with the external thread is provided on the inner wall surface of the nut (300).

8. The sealing joint according to claim 3, characterized in that: The outer surface of the sleeve (211) is sleeved with a first rubber ring gasket (400), one side of the first rubber ring gasket (400) is in contact with the first rotary sleeve (212), and the other side of the first rubber ring gasket (400) is in contact with the second rotary sleeve (222).

9. The sealing joint according to claim 8, characterized in that: The outer surface of the sleeve (211) is also sleeved with a second rubber ring gasket (500) having the same structure as the first rubber ring gasket (400), and the second rubber ring gasket (500) is located between the first rotating sleeve (212) and the nut (300).

10. The sealing joint according to claim 3, characterized in that: A rubber sleeve (600) is embedded in the ends of the sleeve (211) and the threaded sleeve (221) opposite to each other, and the inner wall surface of the rubber sleeve (600) is in contact with the surface of the protective layer (150).

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