A copper-core thermoplastic cable and its sealing joint

Abstract

The present invention discloses a copper-core thermoplastic cable and its sealing joint, belonging to the technical field of cables. The cable includes a cable main body comprising a plurality of regularly distributed stranded conductors, and a shielding layer for reducing electromagnetic interference is respectively provided on the surface of each stranded conductor. An industrial non-woven fabric is commonly provided on the surfaces of the plurality of shielding layers. The joint includes a joint main body sleeved on the surface of the cable main body, and the joint main body includes a male joint and a female joint. Through the combined use of the shielding layer, industrial non-woven fabric, filling layer and protective layer, the present invention can achieve multiple insulation protections, has the advantages of being compression-resistant, freeze-resistant, waterproof and corrosion-resistant, and has strong protection performance. By screwing the female joint onto the male joint and continuously rotating, the female joint drives the clamping member to perform contraction or expansion operations, so as to achieve the effect of pressing or loosening the sealing bushing and the joint main body, without using elastic materials, preventing the deformation that is difficult to recover due to the long-term extrusion of elastic materials.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and more specifically, to a copper core thermoplastic cable and its sealing joint. Background Art

[0002] A cable is a device for transmitting electrical energy or signals, usually composed of several or several groups of wires twisted together. Each group of wires is insulated from each other, often twisted around a center, and is wrapped with a highly insulating covering layer on the outside.

[0003] The existing cables have poor compressive resistance. When impacted or squeezed by external forces, the internal conductors are prone to bending deformation or the insulation layer is cracked, etc., thereby reducing the reliability and service life of the cables.

[0004] At the same time, when connecting a rigid pipe or electrical equipment to a cable, a sealing joint is required for connection.

[0005] For example, the patent document with the publication number CN218850365U discloses an improved cable sealing joint, including a joint body. The joint body is in a circular tube shape. A first outer convex platform is arranged on the middle part of the outer side wall of the joint body along the circumferential direction. A first sealing ring is sleeved on the joint body below the first outer convex platform. A first inner convex platform is arranged on the lower end of the inner side wall of the joint body along the circumferential direction. A core sleeve is arranged in the joint body. The lower end surface of the core sleeve is in contact with the upper end surface of the first inner convex platform. A second sealing ring is arranged between the inner side wall of the core sleeve and the joint body. The upper end of the core sleeve extends upward above the joint body. A cable seal is embedded in the inner side wall of the upper end of the core sleeve. Both the core sleeve and the cable seal are elastic. The upper and lower ends of the outer side wall of the joint body are respectively provided with a first external thread and a second external thread. A nut body is arranged on the upper side of the joint body. The inner side wall of the lower end 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. A second inner convex platform is arranged on the inner side wall of the upper end of the nut body along the circumferential direction. The lower end surface of the second inner convex platform is set as a conical surface. The upper end surface of the core sleeve and the upper end surface of the cable seal are both in contact with the conical surface. A second outer convex platform is arranged on the middle part of the outer side wall of the nut body along the circumferential direction. A third sealing ring is sleeved on the nut body above the second outer convex platform. A third external thread is arranged on the upper end of the outer side wall of the nut body. It can connect a rigid pipe and equipment at the same time. Through elastic sealing components such as the core sleeve, cable seal and sealing rings, the protection and sealing of the cable conductor can be realized. The nitrile material is oil-resistant, and the stainless steel material is corrosion-resistant. It can be applied to petrochemical sites, and can be fire-proof, explosion-proof, corrosion-resistant, oil-resistant and sealed. The protection level reaches IP68. This product has a wide range of uses, is easy to install, can be disassembled and assembled repeatedly, and has a low use cost, 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 after being extruded by the nut body for a long time and is difficult to recover, resulting in the need to replace the core sleeve to ensure the pressing effect during later disassembly and maintenance, 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 its sealing joint to solve the above-mentioned problems in view of the above deficiencies.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A copper-core thermoplastic cable, including a cable body, wherein:

[0010] The cable body includes a plurality of regularly distributed stranded conductors. A shielding layer for reducing electromagnetic interference is respectively provided on the surface of each stranded conductor. An industrial non-woven fabric is commonly provided on the surfaces of the plurality of shielding layers. A filling layer for filling voids is provided between the industrial non-woven fabric and the shielding layer. A protective layer for protecting the filling layer, the industrial non-woven fabric, the shielding layer and the stranded conductor is provided on the surface of the industrial non-woven fabric;

[0011] The protective layer includes a compressive layer provided on the surface of the industrial non-woven fabric and acting as a compressive force. A steel tape armor layer is provided on the surface of the compressive layer. A sheath is provided on the surface of the steel tape armor layer;

[0012] The stranded conductor includes a circular copper core. At least one layer of special-shaped wire layer is closely wound around the surface of the circular copper core. The special-shaped wire layer is composed of a plurality of trapezoidal copper cores closely arranged around the surface of the circular copper core.

[0013] Preferably, the shielding layer includes a conductor shielding layer fixedly coated on the outer surface of the outermost special-shaped wire layer. A silane cross-linked polyethylene insulating layer is provided on the outer surface of the conductor shielding layer. An insulating shielding layer is provided on the outer surface of the silane cross-linked polyethylene insulating layer. A metal shielding layer is provided on the outer surface of the insulating shielding layer;

[0014] Voids are formed between the industrial non-woven fabric and the plurality of metal shielding layers and between two adjacent metal shielding layers. The filling layer fills the voids;

[0015] The compression layer includes an inner isolation layer provided on the outer surface of the industrial non-woven fabric. An outer isolation layer is provided on the inner wall surface of the steel tape armor layer. A plurality of first buffer strips are fixedly connected to the outer surface of the inner isolation layer and are distributed at equal intervals in a circular shape. A plurality of second buffer strips are fixedly connected to the inner wall surface of the outer isolation layer and are distributed at equal intervals in a circular shape. The cross-sections of the first buffer strips and the second buffer strips are both arc-shaped structures. 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, and the outer surface of the second buffer strip contacts the outer surface of the inner isolation layer. Support members are respectively provided in the inner cavities of the first buffer strips and the second buffer strips. The steel tape armor layer is provided on the surface of the outer isolation layer;

[0016] 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 both sides of the corresponding vertical ribs. The inner wall surface of the first buffer strip is fixedly connected to one side of the corresponding reinforcing rib. The inner wall surface of the outer isolation layer and the inner wall surface of the second buffer strip are respectively fixedly connected to both sides of the corresponding vertical ribs. The inner wall surface of the second buffer strip is fixedly connected to one side of the corresponding reinforcing rib.

[0017] The present invention also provides a sealing joint, which is used to achieve the sealing connection between the copper core thermoplastic cable and a hard pipe or equipment as described above, and includes a joint body sleeved on the surface of the cable body, wherein:

[0018] The joint body includes a male joint and a female joint. A sealing bushing is provided in the inner cavity of the male joint to prevent leakage in the gap between the male joint and the cable body. A clamping member for pressing the cable body is provided on the male joint;

[0019] The male joint includes a sleeve, and a first rotating sleeve is integrally formed on the surface of the sleeve. The sealing bushing is clamped in the inner cavity of the sleeve and contacts the surface of the sheath;

[0020] The female joint includes a screw sleeve threadedly sleeved on one end of the surface of the sleeve. A second rotating sleeve is integrally formed on the surface of the screw sleeve. An annular cavity is formed between the second rotating sleeve and the sleeve. The clamping member is located in the annular cavity;

[0021] 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.

[0022] 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.

[0023] Preferably, the cross-sectional opening size of the groove is smaller than the cross-sectional diameter size of the protrusion.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Compared with the prior art, the advantages and positive effects of the present invention are:

[0030] 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.

[0031] 2. In the present invention, by combining the industrial non-woven fabric with the shielding layer, the gaps between the industrial non-woven fabric fibers can effectively absorb and disperse electromagnetic interference, ensuring the quality and stability of the signal transmitted by the cable. By combining the industrial non-woven fabric with the filling layer, additional support and protection can be provided. The network structure formed between the industrial non-woven fabric fibers can effectively fill the gaps in the filling layer, improving the compressive resistance and the ability to resist external forces of the cable body. In addition, the elasticity and plasticity of the industrial non-woven fabric can also closely combine with the shielding layer and the filling layer, improving the mechanical strength and reliability of the cable body. By combining the industrial non-woven fabric with the protective layer, the vibration and impact during the transportation and installation of the cable body can be effectively reduced, and the risk of damage to the cable body caused by external forces can be lowered.

[0032] 3. In the present invention, the joint body is composed of a male joint, a female joint, a sealing bushing and a clamping member. The female joint is screwed onto the male joint and continuously rotated, so that the female joint drives the clamping member to contract or expand, so as to achieve the effect of pressing or loosening the sealing bushing and the joint body. There is no need to use elastic materials, which can prevent the deformation that is difficult to recover due to the long-term extrusion of elastic materials, thereby improving the service life of the sealing joint and reducing the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 It is a schematic structural diagram of the copper core thermoplastic cable according to the embodiment of the present invention;

[0035] Figure 2 It is a schematic structural diagram of the stranded conductor and the shielding layer of the copper core thermoplastic cable according to the embodiment of the present invention;

[0036] Figure 3 For the copper core thermoplastic cable according to the embodiment of the present invention Figure 1 The enlarged structural schematic diagram at position A;

[0037] Figure 4 It is a schematic structural diagram of the connection state between the sealing joint and the cable body according to the embodiment of the present invention;

[0038] Figure 5 It is a schematic structural diagram of the sealing joint according to the embodiment of the present invention;

[0039] Figure 6 It is an exploded structural schematic diagram of the sealing joint according to the embodiment of the present invention;

[0040] Figure 7 Exploded structural view of the male connector and the clamping member of the sealed connector according to an embodiment of the present invention;

[0041] Figure 8 Cross-sectional view of the joint body of the sealed connector according to an embodiment of the present invention;

[0042] Figure 9 Partial cross-sectional view of the joint body of the sealed connector according to an embodiment of the present invention;

[0043] Figure 10 For the sealed connector according to an embodiment of the present invention Figure 8 Enlarged structural view of part B in;

[0044] Figure 11 Structural view of the male connector of the sealed connector according to an embodiment of the present invention;

[0045] Figure 12 Structural view of the second wedge block and the convex block of the sealed connector according to an embodiment of the present invention.

[0046] In the figure: 100, cable main 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, compressive 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 tape armor layer; 153, sheath;

[0047] 200, joint body; 210, male connector; 211, sleeve; 2111, through hole; 212, first swivel; 220, female connector; 221, screw sleeve; 222, second swivel; 230, sealing bushing; 240, clamping member; 241, first wedge block; 242, second wedge block; 243, connecting block; 244, groove; 245, convex block; 246, chute; 247, slider;

[0048] 300, nut; 400, first rubber gasket; 500, second rubber gasket; 600, rubber sleeve. Detailed implementation manners

[0049] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0050] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0051] Example 1, as Figures 1 - 3 shown, a copper-core thermoplastic cable according to an embodiment of the present invention includes a cable main body 100. The cable main body 100 includes a plurality of regularly distributed stranded conductors 110. A shielding layer 120 for reducing electromagnetic interference is respectively provided on the surface of each stranded conductor 110. An industrial non-woven fabric 130 is commonly provided on the surface of the plurality of shielding layers 120. A filling layer 140 for filling voids is provided between the industrial non-woven fabric 130 and the shielding layer 120. The filling layer 140 is made of a flame-retardant filling rope. A protective layer 150 for protecting the filling layer 140, the industrial non-woven fabric 130, the shielding layer 120, and the stranded conductor 110 is provided on the surface of the industrial non-woven fabric 130; the protective layer 150 includes a compressive layer 151 provided on the surface of the industrial non-woven fabric 130 and serving a compressive function. A steel tape armor layer 152 is provided on the surface of the compressive layer 151. A sheath 153 is provided on the surface of the steel tape armor layer 152. Both the compressive layer 151 and the sheath 153 are made of TPE material.

[0052] Among them, the stranded conductor 110 includes a circular copper core 111. At least one layer of special-shaped wire layer is closely wound around the surface of the circular copper core 111. The special-shaped wire layer is composed of a plurality of closely arranged trapezoidal copper cores 112 wound around the surface of the circular copper core 111. Both the circular copper core 111 and the trapezoidal copper cores 112 are made of oxygen-free copper cores, having the advantages of low eccentricity and high conductivity. And by adopting the special-shaped conductor process for the trapezoidal copper cores 112, the gaps between the stranded conductors can be reduced, making the conductors more compact and effectively reducing the resistivity.

[0053] 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. A silane cross-linked polyethylene insulation layer 122 is provided on the outer surface of the conductor shielding layer 121. An insulation shielding layer 123 is provided on the outer surface of the silane cross-linked polyethylene insulation layer 122. A metal shielding layer 124 is provided on the outer surface of the insulation shielding layer 123. The conductor shielding layer 121 is made of a graphene shielding material as the conductor shielding layer. The insulation shielding layer 123 is a cross-linked semi-conductive layer. The metal shielding layer 124 is composed of copper wires sparsely wound around the outer surface of the insulation shielding layer 123 and copper tapes wound with gaps. Through the shielding layer 120, electromagnetic noise interference can be prevented, protecting the signal from being interfered; based on the shielding effect of the electromagnetic field, absorbing or reflecting external electromagnetic waves, reducing electromagnetic interference; eliminating the unevenness, tip effect, and pores on the conductor surface, improving the electric field distribution; for cross-linked cables, it also has the functions of inhibiting the growth of electrical trees and thermal shielding; playing a certain grounding protection role, and the leakage current can flow to the grounding grid, improving safety.

[0054] Among them, there are gaps formed between the industrial non-woven fabric 130 and multiple metal shielding layers 124 and between two adjacent metal shielding layers 124. The filling layer 140 fills the gaps. Through the filling layer 140, the gaps can be filled to maintain the stability of the internal structure of the copper core thermoplastic cable. At the same time, it can be used in cooperation with the silane cross-linked polyethylene insulation layer 122 to play a flame retardant role, so that the copper core thermoplastic cable does not spread fire when encountering fire, extinguishes instantly when leaving the fire, is high-temperature resistant, corrosion-resistant, and safer in electricity use.

[0055] Among them, the compressive layer 151 includes an inner isolation layer 1511 provided on the outer surface of the industrial non-woven fabric 130. An outer isolation layer 1512 is provided on the inner wall surface of the steel tape armor layer 152. A plurality of first buffer strips 1513 distributed at equal intervals in a ring shape are fixedly connected to the outer surface of the inner isolation layer 1511. A plurality of second buffer strips 1514 distributed at equal intervals in a ring shape are fixedly connected to the inner wall surface of the outer isolation layer 1512. The cross-sections of the first buffer strip 1513 and the second buffer strip 1514 are both arc-shaped structures. The number of the second buffer strips 1514 is the same as that of the first buffer strips 1513 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. Support members 1515 are respectively provided in the inner cavities of the first buffer strip 1513 and the second buffer strip 1514. The steel tape armor layer 152 is provided on the surface of the outer isolation layer 1512.

[0056] Among them, the support member 1515 includes vertical ribs 15151. Reinforcing ribs 15152 are integrally formed on both sides of the vertical ribs 15151. 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 both sides of the corresponding vertical ribs 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 both sides of the corresponding vertical ribs 15151. The inner wall surface of the second buffer strip 1514 is fixedly connected to one side of the corresponding reinforcing rib 15152. Through the support member 1515, a branch-like structure can be formed inside the first buffer strip 1513 and the second buffer strip 1514. When an external force acts on the surface of the protective layer 150, the support member 1515 can play a supporting role for the compressive layer 151, making the compressive layer 151 not easily collapse, having the advantage of strong impact resistance, playing a good buffering role, and improving the anti-bending property and ring stiffness of the copper core thermoplastic cable.

[0057] Working principle: Through the support member 1515, a branch-like structure can be formed inside the first buffer strip 1513 and the second buffer strip 1514. When an external force acts on the surface of the protective layer 150, the support member 1515 can support the compression layer 151, making it difficult for the compression layer 151 to collapse, increasing the bending resistance of the protective layer 150, having the advantage of strong impact resistance, playing a good buffering role, and improving the anti-bending property and ring stiffness of the copper core thermoplastic cable.

[0058] Embodiment 2, as Figures 4 - 12 shown, a sealing joint provided in this embodiment is used to achieve the sealing connection between the above-mentioned copper core thermoplastic cable and a hard pipe or equipment. It includes 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. The male joint 210 is provided with a clamping member 240 for pressing the cable body 100; the male joint 210 includes a sleeve 211, and a first rotating sleeve 212 convenient for hand force application is integrally formed on the surface of the sleeve 211. The sealing bushing 230 is clamped in the inner cavity of the sleeve 211 and contacts the surface of the sheath 153; the female joint 220 includes a screw sleeve 221 threadedly sleeved on one end of the surface of the sleeve 211. A second rotating sleeve 222 convenient for hand force application is integrally formed on the surface of the screw sleeve 221. An annular cavity is formed between the second rotating sleeve 222 and the sleeve 211. The clamping member 240 is located in the annular cavity, so that when the female joint 220 is connected to the male joint 210, the second rotating sleeve 222 can block the clamping member 240, effectively improving the integrity and sealing performance of the sealing joint; the clamping member 240 includes a first wedge block 241. A plurality of first wedge blocks 241 are annularly and equidistantly distributed on the surface of the sleeve 211. Through holes 2111 for the first wedge blocks 241 to pass through are opened on the sleeve 211. The inner wall surface of the through hole 2111 is slidably connected to the surface of the first wedge block 241. A second wedge block 242 is movably connected to the surface of each first wedge block 241. A connecting block 243 is fixedly connected between two adjacent second wedge blocks 242. 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 limiting member is provided between the first wedge block 241 and the corresponding through hole 2111, so that a circular ring structure capable of moving along the axial direction of the sleeve 211 is jointly formed between a plurality of second wedge blocks 242 and the connecting block 243, facilitating driving a plurality of first wedge blocks 241 to move synchronously.

[0059] Among them, the linkage member includes a groove 244 formed on the inclined surface of the first wedge block 241. A convex block 245 is slidably connected to the inner cavity of the groove 244. The inclination angles of the groove 244 and the convex block 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 convex block 245 is fixedly connected to the inclined surface of the second wedge block 242. When the second wedge block 242 moves, it can drive the first wedge block 241 to move synchronously through the linkage member. By using the inclined surface structures on the first wedge block 241 and the second wedge block 242 and the inclined groove 244 and convex block 245, the direction of the force can be changed, enabling the mutual conversion between the front-back direction and the left-right direction. Furthermore, a plurality of first wedge blocks 241 can perform contraction or expansion operations to achieve the effect of pressing or loosening the sealing bushing 230 and the cable main body 100.

[0060] Among them, the cross-sectional opening size of the groove 244 is smaller than the cross-sectional diameter size of the convex block 245, which can effectively prevent the convex block 245 from slipping out of the inner cavity of the groove 244, enabling the second wedge block 242 and the first wedge block 241 to always remain in an actively connected state.

[0061] Among them, the limiting member includes a chute 246 formed on one side of the surface of the first wedge block 241. A slider 247 is slidably connected to the inner cavity of the chute 246. 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 towards or away from the sealing bushing 230, it can drive the chute 246 to move synchronously, enabling the slider 247 to slide in the inner cavity of the chute 246, thereby improving the stability of the first wedge block 241 during movement.

[0062] Among them, the surface of the end of the sleeve 211 away from the screw sleeve 221 is provided with an external thread. A nut 300 is movably sleeved on the surface of the sleeve 211. The inner wall surface of the nut 300 is provided with an internal thread that cooperates 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 device and then screwing the nut 300 onto the sleeve 211 and tightening it, the sealing joint can be connected to the device, making the sealing joint applicable to the hard pipe and the device.

[0063] Among them, a first rubber gasket 400 is sleeved on the outer surface of the sleeve 211. One side of the first rubber gasket 400 contacts the first swivel sleeve 212, and the other side of the first rubber gasket 400 contacts the second swivel sleeve 222. The first rubber gasket 400 can effectively prevent leakage from occurring in the gap between the sleeve 211 and the second swivel sleeve 222.

[0064] Among them, a second rubber gasket 500 with the same structure as the first rubber gasket 400 is also sleeved on the outer surface of the sleeve 211. The second rubber gasket 500 is located between the first swivel sleeve 212 and the nut 300. Through the second rubber gasket 500, it can effectively avoid the phenomenon that the first swivel sleeve 212 directly contacts the hard pipe or equipment and causes wear, and can also prevent the leakage phenomenon in the gap between the sleeve 211 and the hard pipe or between the sleeve 211 and the equipment.

[0065] Among them, rubber sleeves 600 are respectively embedded at the opposite ends of the sleeve 211 and the screw sleeve 221. The inner wall surface of the rubber sleeve 600 contacts the surface of the protective layer 150. Through the rubber sleeve 600, the sealing performance between the male joint 210 and the protective layer 150, and between the female joint 220 and the protective layer 150 can be improved, and further improve the sealing performance of the sealing joint.

[0066] Specifically, in this embodiment, for the sealing joint, it is very important to ensure its airtightness and waterproofness. The continuity equation and Navier-Stokes equation in fluid mechanics can be used to analyze the flow behavior of liquids or gases in the joint gap.

[0067] Continuity equation: ;

[0068] Where:

[0069] ρ: density of the fluid (unit: kg / m 3 );

[0070] t: time (unit: s);

[0071] u: velocity vector of the fluid (unit: m / s);

[0072] Divergence of the mass flux, representing the net outflow rate of mass per unit volume;

[0073] It should be noted that in an incompressible fluid (such as a liquid or a low-speed gas), the density ρ is a constant, and the equation is simplified to: ; At this time, the equation only requires the velocity vector u as a parameter, indicating that there is no net mass source or sink in the fluid in space;

[0074] Navier-Stokes equation: Where:

[0075] p is the pressure, representing the static pressure inside the fluid, unit: Pa (N / m²), and its function is the pressure gradient driving the fluid to flow from the high-pressure area to the low-pressure area;

[0076] μ is the dynamic viscosity, which represents the ability of a fluid to resist shear deformation, reflects the magnitude of viscous resistance, unit: Pa·s (or kg / (m·s)), and its role is the viscous term Describes the momentum diffusion caused by fluid viscosity;

[0077] f is the body force, which is the external force acting on a unit volume of fluid (such as gravity, electromagnetic force, etc.), unit: N / m³;

[0078] ρ is the mass density of the fluid, which represents the mass of the fluid per unit volume (unit: kg / m 3 )), and its role is to reflect the inertial characteristics of the fluid. The greater the density, the stronger the inertia;

[0079] u is the velocity vector, which represents the velocity vector field of fluid micro-elements in space, unit: m / s;

[0080] is the local acceleration (acceleration caused by time change);

[0081] t is time (unit: s);

[0082] is the convective acceleration (acceleration caused by the spatial velocity gradient).

[0083] Through the above equations, the leakage risks that may occur under various working conditions can be predicted, which helps to improve the design of the sealing bushing 230 and the rubber gasket, and improve the overall sealing performance of the joint.

[0084] Working principle:

[0085] S1. Connect the male joint 210 to the hard pipe or equipment: When connecting to the hard pipe, insert the sleeve 211 into the end of the hard pipe, and rotate the sleeve 211 by using the first swivel 212. Under the action of the thread, the sleeve 211 is gradually screwed into the end of the hard pipe until the second rubber gasket 500 is tightly attached between the hard pipe and the first swivel 212; when connecting to the equipment, insert the sleeve 211 into the installation hole of the equipment, then sleeved the nut 300 on the end of the sleeve 211 and rotate it. Under the action of the thread, the nut 300 gradually moves towards the direction of the first swivel 212 until the nut 300 moves to the maximum extent, so that the second rubber gasket 500 is tightly attached to the surface of the equipment, and the fixing operation of the male joint 210 can be completed;

[0086] S2. Initially connect the cable body 100 to the joint body 200: Pass the end of the cable body 100 through the inner cavities of one of the rubber sleeves 600, the female joint 220, the male joint 210, the sealing bushing 230, and the other rubber sleeve 600 in sequence, so that the end of the cable body 100 is inserted into the hard pipe or the equipment, and the initial connection operation of the cable body 100 and the joint body 200 can be completed;

[0087] S3. Reconnect the cable body 100 to the joint body 200: Align the screw sleeve 221 with the end of the sleeve 211, and rotate the screw sleeve 221 by using the second swivel sleeve 222. Under the action of the thread, the screw sleeve 221 is gradually screwed onto the surface of the sleeve 211, so that the clamping member 240 gradually enters the inner cavity of the second swivel 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, causing the second wedge block 242 to move towards the first wedge block 241. The second wedge block 242 presses on the first wedge block 241, and the second wedge block 242 drives the convex block 245 to slide in the inner cavity of the groove 244. Then, the first wedge block 241 gradually moves towards the inner cavity of the sleeve 211. The first wedge block 241 drives the sliding groove 246 to move, causing the slider 247 to slide in the inner cavity of the sliding groove 246. Then, the first wedge block 241 gradually presses the sealing bushing 230, making the sealing bushing 230 tightly fit on the surface of the cable body 100. This can not only achieve the clamping operation of the cable body 100, prevent the cable body 100 from loosening from the inner cavity of the joint body 200 due to the pulling of external forces, but also make the sealing bushing 230 closely adhere to the surface of the cable body 100, effectively improving the airtightness between the joint body 200 and the cable body 100. Until the screw sleeve 221 moves to the maximum limit, at this time, both sides of the first rubber gasket 400 are in close contact with the first swivel sleeve 212 and the second swivel sleeve 222 respectively, and the reconnection operation of the cable body 100 and the joint body 200 can be completed.

[0088] Through the above specific embodiments, those skilled in the art of the said technical field can easily implement the present invention. However, it should be understood that the present invention is not limited to the above specific embodiments. Based on the disclosed embodiments, those skilled in the art of the said technical field 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); 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 have an arc-shaped structure, 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).

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 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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