An anti-interference flame-retardant cable

Abstract

The present invention discloses an anti-interference flame-retardant cable, which relates to the technical field of power cables. The key points of its technical solution are: it includes an outer protective layer and a wrapping tape composed of a rubber outer sheath, metal armor and a protective mechanism, a fireproof layer and a waterproof insulation layer to form an inner protective layer, and also includes multiple groups of core guides wrapped in the waterproof insulation layer. The rubber outer sheath, metal armor and protective mechanism and the wrapping tape, the fireproof layer and the waterproof insulation layer are all arranged in sequence from the outside to the inside. In the present invention, the cable effectively divides the overall level of the cable through a protective mechanism composed of multiple annular components. The metal annular seat of the annular component can resist the pressure directly generated by the outside of the cable. When torque is generated outside the cable, the multiple annular seats will buffer the external torque through the springs between them, and greatly reduce the impact on the inner protective layer. Furthermore, when the cable is connected, the position of the inner protective layer can be fine-tuned through the rotating structure of the annular component, and the cable connection can be precise.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and more particularly to an anti-interference flame-retardant cable. Background Art

[0002] Cable is a device for transmitting electrical energy or signals. It can be divided into power cables, communication cables, and control cables according to their use. According to their structure, they can be divided into single-core cables, multi-core cables, and shielded cables. Each cable has multiple structural layers, and depending on the application, there are certain differences between the structural layers of different cables. For anti-interference flame-retardant cables, while achieving power / signal transmission, this type of cable improves its own high-temperature resistance and shielding interference effect by strengthening the flame-retardant and anti-interference structural layers inside the cable.

[0003] Although this type of cable has good anti-interference and flame retardant effects, due to the relatively fixed internal structure of the cable, in order to protect the cable itself, especially before, after and during installation, the cable will inevitably be subjected to the downward pressure generated by human trampling when it is dragged or the installation position is adjusted. The inertia force generated by the swing of the cable on both sides, the torque generated by the rotation during the position adjustment process, and the force generated by different wind directions after installation;

[0004] The cables currently on the market all adopt an integrated wrapping structure. When subjected to stress, the cable is protected mainly by the soft and resilient properties of the rubber outer sheath. Although the rubber sheath can provide protection for the cable, it has certain limitations. On the one hand, when the rubber sheath is subjected to stress, the force transmission is relatively direct, which will also have a certain degree of impact on the internal structure of the cable. On the other hand, when affected by wind, the rubber sheath's own characteristics can play a buffering role. However, if the rubber is subjected to stress for a long time, rubber tensile fatigue will occur, and the rebound efficiency is poor, which cannot guarantee the linear state of the cable, affecting the transmission of power.

[0005] Therefore, in order to solve the above technical problems, the present application proposes an anti-interference flame-retardant cable. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the object of the present invention is to provide an anti-interference flame-retardant cable.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an anti-interference flame-retardant cable, comprising an outer protective layer composed of a rubber outer sheath, a metal armor and a protective mechanism, and a wrapping tape, a fireproof layer and a waterproof insulation layer to form an inner protective layer, and also comprising multiple groups of conductors wrapped in the waterproof insulation layer, wherein the rubber outer sheath, the metal armor and the protective mechanism and the wrapping tape, the fireproof layer and the waterproof insulation layer are all arranged in sequence from the outside to the inside; wherein the protective mechanism comprises multiple groups of annular components that wrap the inner protective layer as a whole and elastic members that are arranged between the multiple groups of annular components to connect the multiple groups of annular components; the annular components comprise an annular seat and an annular sheet that is rotatably connected to the inner end surface of the annular seat and in contact with the inner protective layer; the multiple groups of annular components are each provided with a cross-linked polyethylene layer attached by a chemical coupling agent.

[0008] Preferably, the wrapping tape is any one of a glass fiber tape, a semi-conductive cloth tape and a non-woven fabric tape, and an anti-interference layer that is entirely wrapped by a metal sheet is provided between the wrapping tape and the fireproof layer.

[0009] Preferably, the fireproof layer is any one of ceramic silicone rubber, flame retardant paper tape and flame retardant gauze, the waterproof insulation layer is any one of polyethylene, expandable coconut fiber, waterproof tape and waterproof paste, and a semi-conductive shielding layer is provided between the waterproof insulation layer and the conductor core, and the semi-conductive shielding layer is any one of semi-conductive polyethylene, semi-conductive rubber and semi-conductive gauze.

[0010] Preferably, the annular seat and the annular sheet are both made of metal, a slide groove a is provided on the inner end surface of the annular seat, and slide grooves b for limiting the annular sheet are provided on the seat body on both sides of the slide groove a.

[0011] Preferably, a plurality of groups of spherical parts for driving the annular piece to rotate are arranged circumferentially on the end surface where the annular piece is engaged with the slide groove a, and each group of spherical parts has at least two spherical parts arranged in a transverse structure.

[0012] Preferably, spheres a engaged with the slide grooves b are provided on both sides of the gaps between the plurality of groups of spherical parts, and the spheres a are engaged with the spherical grooves provided on the engaging end faces of the annular pieces.

[0013] Preferably, the spherical part includes a ball sleeve connected to the engaging end surface of the annular piece and a sphere b engaged in the ball sleeve and in contact with the bottom surface of the slide groove a. Both the sphere b and the sphere a are made of metal.

[0014] Preferably, the elastic member is circumferentially arranged on the side wall of the annular seat for linear connection between multiple groups of the annular components. The elastic member includes a connecting seat arranged on the side wall of the annular component and a spring connected between two groups of connecting seats.

[0015] Preferably, the multiple groups of elastic members are distributed in an inclined mirror-image manner, and the end surface of the connecting seat connecting the spring is an inclined surface.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The cable in the present invention effectively divides the overall layer of the cable through a protection mechanism composed of multiple annular components. The metal annular seat of the annular component can withstand the pressure directly generated by the outside of the cable. At the same time, the annular piece with a rotating structure with the annular seat can realize the relative rotation between the inner and outer protective layers. When torque is generated outside the cable, the multiple annular seats will provide buffering through the springs between them, and greatly reduce the impact on the inner protective layer. Furthermore, when the cable is connected, the position of the inner protective layer can be fine-tuned through the relative rotation characteristics of the annular components, and the cable connection can be accurately performed.

[0018] 2. The annular components in the cable of the present invention, after the cables are linearly connected, are connected by multiple inclined, mirror-distributed springs. This ensures the balance and stability of the cable as a whole. On the other hand, when affected by wind forces from different directions, the annular components are flexibly connected by the springs, and can resist and buffer the forces generated by different wind directions. At the same time, when the force decreases to a stop, the springs can drive the cable to quickly reset, and during the reset process, the external rubber sleeve will also be quickly reset, ensuring the normal flow of electricity while also providing protection for the rubber sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 This is the overall structural diagram of the cable in the present invention;

[0021] Figure 2 This is the overall front view of the cable in the present invention;

[0022] Figure 3 This is the overall structural diagram of the cable internal protection mechanism in the present invention;

[0023] Figure 4 For the present invention Figure 3 A magnified view of point A;

[0024] Figure 5 For the present invention Figure 3 Enlarged view of point B;

[0025] Figure 6 Schematic diagram of the protection mechanism under different forces in the present invention;

[0026] Figure 7 This is the overall structural diagram of the annular assembly in the present invention;

[0027] Figure 8 This is an overall exploded view of the annular assembly in the present invention;

[0028] Figure 9 For the present invention Figure 8 Enlarged view of point C;

[0029] Figure 10 A diagram showing the positional relationship of the metal sheets in the present invention;

[0030] Figure 11 2 is a positional relationship diagram of the semi-conductive shielding layer in the present invention.

[0031] 1. Rubber outer sheath; 2. Metal armor; 3. Protection mechanism; 4. Wrapping tape; 5. Fireproof layer; 6. Waterproof insulation layer; 7. Guide core; 8. Ring assembly; 9. Elastic part; 901. Connecting seat; 902. Spring; 10. Ring seat; 1001. Slide a; 1002. Slide b; 11. Ring sheet; 1101. Sphere a; 1102. Ball sleeve; 1103. Sphere b; 12. Metal sheet; 13. Semi-conductive shielding layer. DETAILED DESCRIPTION

[0032] like Figure 1-11 As shown, the present invention provides an anti-interference flame-retardant cable, comprising an outer protective layer consisting of a rubber outer sheath 1, a metal armor 2, and a protective mechanism 3, and an inner protective layer consisting of a wrapping tape 4, a fireproof layer 5, and a waterproof insulating layer 6, and further comprising a plurality of conductors 7 wrapped in the waterproof insulating layer 6. The rubber outer sheath 1, the metal armor 2, the protective mechanism 3, the wrapping tape 4, the fireproof layer 5, and the waterproof insulating layer 6 are arranged in order from the outside to the inside;

[0033] The wrapping tape 4 is any one of a glass fiber tape, a semi-conductive cloth tape and a non-woven fabric tape, such as Figure 10 As shown, an anti-interference layer that is entirely wrapped by a metal sheet 12 is provided between the wrapping tape 4 and the fireproof layer 5. The wrapping tape 4 needs to ensure the stability and tightness of the entire wrapping of the inner protective layer, and also needs to have corrosion resistance and high temperature resistance. Based on the effect, the wrapping tape 4 of the corresponding material needs to be adaptively selected based on the cable use and different layer structures. The material of the metal sheet 12 can be selected from metals such as copper, aluminum and tungsten. While achieving the anti-interference effect, it can also be adaptively selected according to the characteristics of the metal.

[0034] At the same time, the fireproof layer 5 is any one of ceramic silicone rubber, flame retardant paper tape and flame retardant yarn tape, and the waterproof insulation layer 6 is any one of polyethylene, expanded coconut fiber, waterproof tape and waterproof paste, such as Figure 11As shown, a semi-conductive shielding layer 13 is provided between the waterproof insulating layer 6 and the conductor core 7. The semi-conductive shielding layer 13 is any one of semi-conductive polyethylene, semi-conductive rubber and semi-conductive gauze. The fireproof layer 5 mainly tends to be flame retardant, and it is necessary to select a material with a low thermal conductivity. At the same time, the fireproof layer 5 is not limited to ceramic silicone rubber, flame retardant paper tape and flame retardant gauze, and the specific fireproof layer 5 depends on the application scenario and environment of the cable.

[0035] Furthermore, the waterproof insulation layer 6 mainly provides protection for the conductor core 7. Different materials of the waterproof insulation layer 6 have different effects, including mechanical resistance, waterproof and moisture-proof, improving cable shape, preventing interference, reducing noise, etc. The material selection of this layer is still based on the use and layer structure of the cable. Optional lipid fillers include polyethylene, polyvinyl chloride and polyurethane, or foam materials (polystyrene foam), mineral additives (asbestos, inorganic mineral materials) and water resistance materials (expanded polymers), etc., which can be selected based on the actual application of the cable.

[0036] The semi-conductive shielding layer 13 provides secondary protection to the conductor core 7 based on the protection of the waterproof insulation layer 6, such as electromagnetic interference shielding, uniform electric field distribution and leakage reduction, so as to ensure the stability of power transmission;

[0037] While the cable achieves anti-interference and flame retardant effects, it is also necessary to further improve the cable's resistance, such as Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the overall resistance of the cable is enhanced by a protection mechanism 3 disposed between the metal armor 2 and the wrapping tape 4. The protection mechanism 3 includes multiple groups of annular components 8 that wrap the inner protective layer as a whole, and elastic members 9 disposed between the multiple groups of annular components 8 to connect the multiple groups of annular components 8.

[0038] Furthermore, in order to achieve the overall protection effect of the inner protective layer, as Figure 3 As shown, the protection mechanism 3 adopts an annular structure that matches the cable. The annular component 8 includes an annular seat 10 and an annular piece 11 that is rotatably connected to the inner end surface of the annular seat 10 and in contact with the inner protective layer. The annular piece 11 and the annular seat 10 are independent structures. The annular piece 11 can perform circular motion on the annular seat 10. At the same time, the annular piece 11 is also the contact end of the annular component 8 and the inner protective layer, thereby forming two independent areas between the outer protective layer and the inner protective layer, and the annular piece 11 is the dividing end, as shown in FIG. Figure 6 As shown, the cable rotation generates a torque F τWhen the cable is in a straight state, the outer protective layer will not affect the inner protective layer. If the cable is slightly bent, the protective layer in some areas will be subjected to very small forces. At the same time, when the cable is connected, the inner protective layer can be adjusted as a whole according to the specific connection position of the guide core 7 by relative rotation between the annular seat 10 and the annular sheet 11 to ensure the accuracy of the connection of the guide core 7.

[0039] Based on the above, in order to achieve the effect of the rotation of the annular sheet 11 and the annular seat 10 and the resistance of the annular seat 10 itself, as Figure 6 、 Figure 8 and Figure 9 As shown, a slide groove a1001 is provided on the inner end surface of the annular seat 10, and slide grooves b1002 for limiting the annular sheet 11 are provided on the seat body on both sides of the slide groove a1001;

[0040] Furthermore, in order to achieve the adaptability of the rotation between the annular seat 10 and ensure the stability of the annular piece 11 during the rotation process, as shown in FIG. Figure 7 、 Figure 8 As shown, the end surface of the annular piece 11 that engages with the chute a1001 is circumferentially provided with multiple groups of spherical members that drive the annular piece 11 to rotate. Each group of spherical members is provided with at least two spherical members and is arranged in a horizontal structure. At the same time, spheres a1101 that engage with the chute b1002 are provided on both sides of the gaps between the multiple groups of spherical members. The spheres a1101 are embedded in the spherical grooves provided on the end surface of the annular piece 11.

[0041] Specifically, the spherical member includes a ball sleeve 1102 connected to the engaging end surface of the annular piece 11 and a ball b1103 engaged in the ball sleeve 1102 and in contact with the bottom surface of the slide a1001. The ball b1103 and the ball a1101 are both made of metal. The rotation of the annular piece 11 on the annular seat 10 involves rotation at two different positions, namely the notch and the groove of the slide a1001, both of which adopt the form of spherical rolling. The materials of the annular seat 10, the annular piece 11, the ball sleeve 1102, the ball a1101 and the ball b1103 can be steel, copper or a better alloy material. Due to the rotation of the annular piece 11, it is more related to the torque F generated by the cable rotation. τ and the position adjustment of the guide core 7. When subjected to forces in other directions, especially after the cable is connected, the rotation of the ring assembly 8 is less involved;

[0042] It should be noted that since the annular seat 10 itself is made of metal, when the cable is idle, the annular seat 10 itself can resist the direct external force and provide effective protection for the inner protective layer. At the same time, in order to improve the contact tightness between the annular piece 11 and the wrapping belt 4, an integral particle protrusion can be provided on the end surface of the annular piece 11 in contact with the wrapping belt 4, or a non-slip layer that increases friction, such as a rubber layer or a nylon layer, can be added to the contact surface of the wrapping belt 4. The spacing between the annular seats 10 needs to be adaptively adjusted according to the cable length, the stress environment and the structure of the elastic member 9.

[0043] Furthermore, in order to adapt to the resistance of the cable after connection, such as Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the elastic members 9 for connecting the multiple groups of annular components 8 are circumferentially arranged on the side wall of the annular seat 10 for linear connection between the multiple groups of annular components 8;

[0044] Specifically, such as Figure 4 and Figure 6 As shown, the elastic member 9 mainly connects the multiple ring components 8 to ensure the linearity of the cable, and can also adapt to and buffer the forces exerted on the cable in different directions, including Figure 6 F in x 、F y and in F x With F y The forces F acting in different directions x-y ;

[0045] The elastic member 9 includes a connecting seat 901 provided on the side wall of the annular component 8 and a spring 902 connected between the two sets of connecting seats 901. The number and type of the springs 902 need to be adaptively selected according to the size, type and application scenario of the cable.

[0046] Furthermore, the multiple groups of elastic members 9 are arranged in an inclined mirror-image manner, and the end surface of the connecting seat 901 connecting to the spring 902 is an inclined surface. The inclined mirror-image distribution of the elastic members 9 can, on the one hand, provide better balance and stability for the protection mechanism 3 and the cable as a whole, and on the other hand, better share the force generated between the springs 902;

[0047] In order to avoid the heat conduction effect between the inner and outer protective layers, the annular component 8 is provided with a cross-linked polyethylene layer attached by a chemical coupling agent. The cross-linked polyethylene layer isolates the metal annular seat 10 and the annular sheet 11 from the inner and outer protective layers respectively, making the annular component 8 an independent part that does not affect the inner and outer protective layers.

[0048] In summary, the cable is divided into an outer protective layer and an inner protective layer by the protective mechanism 3. Based on the external pressure or rotating torque generated before and during the installation of the cable, the metal ring seat 10 itself can directly resist the external force. Since the outer protective layer and the inner protective layer are divided by the rotating structure, the rotating torque F τ It is the torque F generated directly from the outside of the cable, in the same or different directions τ , will be buffered by the spring 902 between the rubber outer sheath 1 and the annular seat 10. After the force ends, the spring 902 will also quickly drive the rubber outer sheath 1 to reset its deformation, and the torsion F τ When the inner protective layer rotates relative to the annular seat 10 and the annular sheet 11, the outer protective layer has little effect on the inner protective layer, thereby providing effective protection for the inner protective layer. Based on the relative rotation, when the cable is connected, the connection position of the inner protective layer can also be fine-tuned by rotating to ensure accurate connection and avoid the cumbersome adjustment of the cable as a whole. After the cable is connected, it will be subjected to wind forces F in different directions. x 、F y and F x-y When the impact and wind force affect the local area of ​​the cable, the multiple groups of annular seats 10 can effectively buffer the force generated by the cable under the action of the multiple groups of springs 902. At the same time, when the wind force becomes smaller or stops, it will drive the deformation of the cable to reset, avoiding the situation where the rubber outer sheath 1 cannot be reset after fatigue, affecting power transmission, and at the same time protecting the soft connection structure of the mechanism 3. While achieving protection for the cable, it will not affect the shipment of the cable.

[0049] The above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any ordinary technician in this industry can smoothly implement the invention as shown in the drawings and above. However, any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. An anti-interference flame-retardant cable, comprising an outer protective layer consisting of a rubber outer sheath (1), a metal armor (2) and a protective mechanism (3), an inner protective layer consisting of a wrapping tape (4), a fireproof layer (5) and a waterproof insulation layer (6), and further comprising a plurality of conductor cores (7) wrapped in the waterproof insulation layer (6), characterized in that: The rubber outer sheath (1), metal armor (2), protection mechanism (3), wrapping tape (4), fireproof layer (5) and waterproof insulation layer (6) are all arranged in order from the outside to the inside; The protective mechanism (3) comprises a plurality of annular components (8) for integrally wrapping the inner protective layer, and elastic members (9) disposed between the plurality of annular components (8) for connecting the plurality of annular components (8); The annular assembly (8) comprises an annular seat (10) and an annular sheet (11) rotatably connected to the inner end surface of the annular seat (10) and in contact with the inner protective layer; The elastic member (9) is circumferentially arranged on the side wall of the annular seat (10) and is used for linear connection between multiple groups of the annular components (8). The elastic member (9) includes a connecting seat (901) arranged on the side wall of the annular component (8) and a spring (902) connected between two groups of connecting seats (901). The multiple groups of elastic members (9) are distributed in an inclined mirror-image manner, and the end surface of the connecting seat (901) connected to the spring (902) is an inclined surface. A cross-linked polyethylene layer attached via a chemical coupling agent is provided on each of the plurality of annular components (8).

2. The anti-interference flame-retardant cable according to claim 1, characterized in that: The wrapping tape (4) is any one of a glass fiber tape, a semi-conductive cloth tape and a non-woven fabric tape, and an anti-interference layer that is entirely wrapped by a metal sheet (12) is provided between the wrapping tape (4) and the fireproof layer (5).

3. The anti-interference flame-retardant cable according to claim 1, characterized in that: The fireproof layer (5) is any one of ceramic silicone rubber, flame-retardant paper tape and flame-retardant gauze tape; the waterproof insulation layer (6) is any one of polyethylene, expanded coconut fiber, waterproof tape and waterproof paste; a semi-conductive shielding layer (13) is provided between the waterproof insulation layer (6) and the conductor core (7); the semi-conductive shielding layer (13) is any one of semi-conductive polyethylene, semi-conductive rubber and semi-conductive gauze.

4. The anti-interference flame-retardant cable according to claim 1, characterized in that: The annular seat (10) and the annular plate (11) are both made of metal. A slide groove a (1001) is provided on the inner end surface of the annular seat (10), and slide grooves b (1002) for limiting the annular plate (11) are provided on the seat body on both sides of the slide groove a (1001).

5. The anti-interference flame-retardant cable according to claim 4, characterized in that: A plurality of groups of spherical parts are arranged circumferentially on the end surface of the annular piece (11) and the slide groove a (1001) that are engaged with each other, and the spherical parts drive the annular piece (11) to rotate. Each group of spherical parts has at least two spherical parts and is arranged in a transverse structure.

6. The anti-interference flame-retardant cable according to claim 5, characterized in that: Balls a (1101) engaged with the slide grooves b (1002) are provided on both sides of the gaps between the plurality of groups of spherical parts, and the ball a (1101) is engaged in the spherical groove holes provided on the engaging end faces of the annular pieces (11).

7. The anti-interference flame-retardant cable according to claim 6, characterized in that: The spherical part includes a ball sleeve (1102) connected to the engaging end surface of the annular piece (11) and a sphere b (1103) engaged in the ball sleeve (1102) and in contact with the bottom surface of the slide groove a (1001). The sphere b (1103) and the sphere a (1101) are both made of metal.

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