Protective cable for instrument

Abstract

The utility model discloses a protective cable for an instrument, which belongs to the technical field of cables and comprises a cable core, and a plurality of wire cores are arranged in the cable core. A first shielding layer is arranged on each wire core, a second shielding layer, an elastic separation layer, a third shielding layer and a sheath layer are sequentially arranged outside the cable core, at least one of the first shielding layer, the second shielding layer and the third shielding layer is made of an anti-radio frequency interference material, and at least one of the first shielding layer, the second shielding layer and the third shielding layer is made of an anti-electromagnetic interference material. According to the utility model, both magnetic field interference and radio frequency interference can be resisted, so that the problem that the anti-interference performance is not comprehensive enough is solved. In addition, the shielding layers are respectively arranged on the wire cores, so that mutual interference among different wire cores can be realized; the two shielding layers are arranged outside the cable core, so that the common shielding effect of all the wire cores can be enhanced. And the elastic separation layer is arranged between the two shielding layers, so that the flexibility of the cable is promoted.

Description

Technical Field

[0001] This utility model mainly relates to the field of cable technology, specifically a protective cable for instruments. Background Technology

[0002] Instrument cables are mainly used for signal transmission and control circuits in instruments, meters, and other electrical equipment. Patent application number 202321121806.7 discloses an instrument signal cable with good shielding effect, comprising a first insulation layer, an abrasion-resistant layer on the outside of the first insulation layer, a shielding layer inside the first insulation layer, a protective core inside the shielding layer, a second insulation layer inside the protective core, and multiple core materials inside the second insulation layer. This cable achieves magnetic shielding by using a high-permeability material for the shielding layer, preventing magnetic field interference and making the cable signal transmission more stable. Furthermore, the abrasion-resistant layer makes the cable surface less susceptible to damage during use, thus protecting the shielding layer and preventing damage from affecting the shielding effect.

[0003] However, in some complex applications (such as locations with wireless or high-frequency signal equipment), instrument cables must not only resist electromagnetic interference from surrounding motors, frequency converters, and other equipment, but also radio frequency interference from various wireless communication devices and automated control systems. Therefore, it is necessary to research an instrument cable that is resistant to both magnetic field and radio frequency interference. Utility Model Content

[0004] This utility model provides a solution that is significantly different from existing technologies, addressing the problem that existing solutions are too simplistic. It mainly provides a protective cable for instruments to solve the problem of insufficient anti-interference performance mentioned in the background.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A protective cable for instruments includes a cable core containing multiple conductors. Each conductor has a first shielding layer, and outside the cable core are sequentially a second shielding layer, an elastic separation layer, a third shielding layer, and a sheath layer. At least one of the first, second, and third shielding layers is made of a material resistant to radio frequency interference, and at least one of them is made of a material resistant to electromagnetic interference.

[0007] Furthermore, the third shielding layer is made of an anti-radio frequency interference material, and the second shielding layer and / or the first shielding layer are made of a material with high magnetic permeability.

[0008] Furthermore, the third shielding layer is woven from silver-plated copper wire.

[0009] Furthermore, the second shielding layer is made of permalloy foil or strip.

[0010] Furthermore, the first shielding layer is made of copper foil or copper strip.

[0011] Furthermore, the material of the elastic separator layer is flame-retardant rubber.

[0012] Furthermore, an elastic support is provided at the center of the cable core, and multiple wire cores surround the elastic support.

[0013] Furthermore, the wire core includes a conductor and an insulating layer covering the outside of the conductor, with the first shielding layer covering the outside of the insulating layer.

[0014] Furthermore, a filler layer is provided between the wire core and the second shielding layer, and the filler layer separates the wire core from the second shielding layer.

[0015] Furthermore, the filling layer includes filling strips in the same number as the wire cores, and the inner ends of the filling strips are located between two adjacent wire cores.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention solves the problem of insufficient anti-interference performance by setting three shielding layers, with at least one made of anti-radio frequency interference material and at least one made of anti-electromagnetic interference material. This allows the cable provided by this invention to resist both magnetic field interference (or magnetic field interference and electric field interference). Furthermore, by setting a shielding layer on each wire core, interference between different wire cores can be prevented; by setting two shielding layers on the outside of the cable core, the common shielding effect for all wire cores can be enhanced.

[0018] This invention features an elastic separator layer between the second and third shielding layers. This separator allows for a certain relative displacement of the third shielding layer compared to the second shielding layer when the cable is bent, thereby promoting cable flexibility and meeting the bending requirements of instrument cables. Simultaneously, it effectively buffers stress when the cable is subjected to external tensile or bending forces, protecting the internal core wires and insulation layers. Furthermore, the use of flame-retardant rubber imparts flame-retardant properties to the cable.

[0019] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the present invention in Embodiment 2;

[0021] Figure 2 This is a cross-sectional view of the present invention in Embodiment 3.

[0022] Reference numerals: 1. Elastic support; 2. Core wire; 21. Conductor; 22. Insulation layer; 23. First shielding layer; 3. Filler layer; 31. Filler strip; 4. Second shielding layer; 5. Elastic separator layer; 6. Third shielding layer; 7. Sheath layer. Detailed Implementation

[0023] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] Example 1: Please refer to the appendix for details. Figure 1 A protective cable for instruments, comprising:

[0027] The conductor core 2 includes a conductor 21 made of twisted copper wires and an insulation layer 22 covering the outside of the conductor 21. The insulation layer 22 is made of polyethylene insulating material. A first shielding layer 23, made of copper foil, covers the insulation layer 22. When an external electric field (such as an electric field from high-voltage lines or other equipment) acts on the cable, the copper foil shielding layer induces an opposite charge, thereby canceling the external electric field. In other words, the copper foil effectively terminates the external electric field on the surface of the shielding layer, reducing the interference of the electric field on the inside of the cable by reflecting and absorbing electric field energy. Furthermore, it achieves mutual shielding between the conductor cores 2. Multiple conductor cores 2 are provided, and these multiple conductor cores 2 are twisted together to form a cable core.

[0028] The second shielding layer 4 is made by wrapping permalloy strip around the cable core. Permalloy has a high magnetic permeability, and when an external magnetic field (such as a magnetic field from a transformer or other equipment) approaches, it can effectively concentrate the external magnetic field inside the shielding material, reducing the interference of the magnetic field on the signal inside the cable.

[0029] The elastic separator layer 5 is made of neoprene rubber (CR) extruded onto the outside of the second shielding layer 4. Neoprene rubber has good elasticity and is located between the second shielding layer 4 and the third shielding layer 6. It allows for a certain relative displacement of the shielding layers when the cable is bent, thus ensuring the overall flexibility of the cable. Simultaneously, it effectively buffers stress when the cable is subjected to external tensile or bending forces, protecting the internal core wires and insulation layers. Furthermore, neoprene rubber itself contains chlorine, which releases hydrogen chloride gas during combustion. This gas dilutes the oxygen concentration in the surrounding air and can interfere with the chain reaction of combustion. At the same time, after burning, neoprene rubber forms a carbonized layer on its surface, which acts as an insulator against oxygen and heat, preventing further spread of the flame.

[0030] The third shielding layer, 6, is made of silver-plated copper wire braid. Silver has better conductivity than ordinary copper at high frequencies, enabling it to more effectively reflect radio frequency (RF) signals. When RF signals (such as signals from radio transmitting equipment) encounter the silver-plated copper wire braid layer, most of the signal is reflected back, thus reducing RF interference that could enter the cable and affect signal transmission. Furthermore, placing the relatively flexible copper wire braided shielding layer on the outer edge allows it to absorb some of the stress when the cable is bent or stretched, providing a buffering effect. The other inner shielding layers are then better protected, reducing the risk of damage due to excessive bending.

[0031] The sheath layer 7 is made of thermoplastic polyurethane (TPU) extruded onto the outside of the third shielding layer 6. It has high tensile strength, tear strength, and elongation, providing excellent mechanical protection for the cable; it has excellent abrasion resistance, protecting the cable from external friction and wear, extending its service life; it is resistant to ultraviolet rays, ozone, and oxidation, making it suitable for outdoor use and maintaining stability even under extreme climatic conditions.

[0032] Example 2: The difference between this example and Example 1 is that:

[0033] Please refer to the attached document carefully. Figure 1The cable core has an elastic support 1 at its center, with multiple conductors 2 surrounding the elastic support 1. The elastic support 1 is made of high-strength polyester fiber, a synthetic fiber with significantly higher strength than ordinary polyester fiber. Its tensile strength can reach 700-900 MPa, and its elongation at break is approximately 10%-15%, exhibiting good elasticity and toughness. This enhances the cable's tensile and bending resistance.

[0034] A filling layer 3 is provided between the wire core 2 and the second shielding layer 4, and the filling layer 3 separates the wire core 2 and the second shielding layer 4 to avoid contact and friction between the two.

[0035] The second shielding layer 4 is made of permalloy foil.

[0036] The first shielding layer 23 is made of copper strip.

[0037] The elastic separator layer is made of silicone rubber. The main chain of silicone rubber is composed of silicon-oxygen (Si-O) bonds, which have high bond energy, giving silicone rubber a certain degree of thermal stability. For flame retardancy, some silicone rubbers incorporate metal oxide flame retardants, such as aluminum hydroxide or magnesium hydroxide. During combustion, these flame retardants decompose, absorbing heat and releasing water vapor, thus reducing the flame temperature and achieving flame retardancy. Simultaneously, silicone rubber is a highly elastic material with a low elastic modulus, giving it excellent flexibility. It maintains good elasticity over a wide temperature range (-60℃ to 200℃), adapting to the expansion, contraction, and bending of cables under different ambient temperatures.

[0038] Everything else is the same as in Example 1.

[0039] Example 3: The difference between this example and Example 2 is that:

[0040] Please refer to the attached document carefully. Figure 2 The filling layer 3 includes filling strips 31 in number equal to the number of wire cores 2, with the inner ends of the filling strips 31 located between two adjacent wire cores 2. The filling strips 31 are made of polyurethane flame-retardant foam, which achieves its flame-retardant properties by adding phosphorus-based, halogen-based, or other flame retardants. Simultaneously, its cellular structure gives it excellent softness, elasticity, and cushioning properties, effectively protecting each wire core 2 and ensuring the overall flexibility of the cable.

[0041] The rest is the same as in Example 2.

[0042] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A protective cable for instruments, comprising a cable core, wherein the cable core contains a plurality of conductors (2); characterized in that: Each wire core (2) is provided with a first shielding layer (23), and outside the cable core are a second shielding layer (4), an elastic separation layer (5), a third shielding layer (6) and a sheath layer (7) in sequence. At least one of the first shielding layer (23), the second shielding layer (4) and the third shielding layer (6) is made of radio frequency interference resistant material, and at least one of them is made of electromagnetic interference resistant material.

2. The instrument protective cable according to claim 1, characterized in that: The third shielding layer (6) is made of radio frequency interference resistant material, and the second shielding layer (4) and / or the first shielding layer (23) are made of high magnetic permeability material.

3. The instrument protective cable according to claim 2, characterized in that: The third shielding layer (6) is woven from silver-plated copper wire.

4. The instrument protective cable according to claim 2, characterized in that: The second shielding layer (4) is made of permalloy foil or strip.

5. The instrument protective cable according to claim 1, characterized in that: The first shielding layer (23) is made of copper foil or copper strip.

6. The instrument protective cable according to claim 1, characterized in that: The material of the elastic separator layer (5) is flame-retardant rubber.

7. The instrument protective cable according to claim 1, characterized in that: An elastic support (1) is provided at the center of the cable core, and multiple wire cores (2) surround the elastic support (1).

8. The instrument protective cable according to claim 1, characterized in that: The core (2) includes a conductor (21) and an insulating layer (22) covering the outside of the conductor (21), and the first shielding layer (23) covers the outside of the insulating layer (22).

9. A protective cable for instruments according to claim 1, characterized in that: A filling layer (3) is provided between the wire core (2) and the second shielding layer (4), and the filling layer (3) separates the wire core (2) from the second shielding layer (4).

10. A protective cable for instruments according to claim 9, characterized in that: The filling layer (3) includes filling strips (31) in the same number as the wire cores (2), and the inner ends of the filling strips (31) are located between two adjacent wire cores (2).

Images