Sensor cable with mechanical vibration resistance and high flexibility

Abstract

A mechanical vibration resistant high-flexibility sensor cable relates to the field of sensor cables, and comprises a filling core, insulating wire cores, a semi-conductive shielding layer, a shielding layer and a sheath, a plurality of insulating wire cores are arranged outside the filling core to form a cable core, and the semi-conductive shielding layer, the shielding layer and the sheath are sequentially arranged outside the cable core. The utility model relates to a cable for a sensor control system, which is used on machinery or railway devices and the like and needs to stably run in a severe environment for a long time, is matched with a detection system and a sensor for use, has high flexibility, and has the effects of resisting engine oil, emulsifying agents, saline water, seawater, alkali, ozone, ultraviolet radiation and the like.

Description

Technical Field

[0001] The utility model relates to the field of sensor cables, in particular to a high-flexibility sensor cable that is resistant to mechanical vibration. Background Art

[0002] The function of the sensor is to convert the detected physical or chemical changes into electrical signals, which are sent to the processor to identify the state and changes of the object. The sensor cable is the transmission medium of the signal. As the scope of sensor use becomes wider and wider, the environment it faces becomes more and more complex. The reliable and stable transmission performance of the sensor cable becomes particularly important.

[0003] When using cables in harsh environments, they will face certain extrusion and bending deformation. If the cable has low flexibility, the insulation of the insulated core may be damaged when the cable undergoes a large deformation, causing damage to the cable. Or the deformation of the core may cause signal distortion or instability to a certain extent, reducing the reliability of the sensor cable in use.

[0004] Application number CN200720099566 is a flexible sensor cable, the insulation and inner sheath are made of polyvinyl chloride material, and the shielding layer is made of braided tinned copper wire. Since polyvinyl chloride material has a certain rigidity, the flexibility of the cable is reduced after the cable core is formed and the inner sheath is extruded, and the shielding adopts a braided shielding method, which makes the cable core structure more compact and reduces the bending performance, resulting in the overall flexibility of the cable being average. Summary of the invention

[0005] The utility model provides a highly flexible sensor cable resistant to mechanical vibration. It is a cable for a sensor control system which is used in conjunction with a detection system and a sensor and which is required to operate stably for a long time in a severe and harsh environment on machinery or railway equipment. It has high flexibility and is resistant to engine oil, emulsifiers, salt water, seawater, alkali, ozone and ultraviolet radiation.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: a high-flexibility sensor cable resistant to mechanical vibration, including a filling core, an insulating core, a semi-conductive shielding layer, a shielding layer and a sheath, a plurality of insulating cores are arranged outside the filling core to form a cable core, and a semi-conductive shielding layer, a shielding layer and a sheath are arranged outside the cable core in sequence.

[0007] The beneficial effects of the utility model are as follows: the cable has excellent capacitance and inductance performance, the maximum capacitance between any insulating cores, and between the insulating cores and the wrapped tough copper monofilament shielding layer is no more than 160pF / m, and the relative inductance between insulating cores is no more than 1.0μH / m. The cable is made of a core filler and an insulating core twisted into a cable core, and the core filler can improve the roundness of the cable core, and prevent the insulating core from being deformed due to extrusion during the twisting process, thereby affecting performance indicators such as capacitance and inductance. A layer of semi-conductive PVC shielding layer is extruded outside the cable core to eliminate the air gap between the insulating layer and the metal shielding layer, so that the voltage distribution inside the cable is uniform, and at the same time, it can play an effective electromagnetic shielding role. At the same time, the semi-conductive shielding layer is embedded in the gap between the insulating cores, so that the position of the insulating cores is relatively fixed. When vibration or bending occurs, the position of the insulating cores will not be greatly offset, thereby affecting the stability of signal transmission.

[0008] The utility model cable structure is a cable with multiple insulated cores twisted around the filling core, and the insulated cores are arranged neatly and tightly, so that the cable core has good flexibility, the cable has a round shape and a stable structure. The cable has high flexibility, excellent high and low temperature resistance, wear resistance, flame retardancy and other characteristics, is safe and environmentally friendly, has excellent performance, and can ensure good and stable signal transmission in various harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the utility model;

[0010] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model.

[0011] In the figure: 1, core filling; 2, insulated core; 2-1, conductor; 2-2, insulating layer; 3, semi-conductive shielding layer; 4, shielding layer; 5, sheath. DETAILED DESCRIPTION

[0012] like Figure 1 , 2 As shown, a highly flexible sensor cable resistant to mechanical vibration includes a filling core 1, an insulating core 2, a semi-conductive shielding layer 3, a shielding layer 4, and a sheath 5. Several insulating cores 2 are arranged outside the filling core 1 and twisted into a cable core. The number of insulating cores 2 is 4 or 6 or more, and in this embodiment, there are 6. A layer of semi-conductive polyvinyl chloride material is extruded outside the cable core as the semi-conductive shielding layer 3, a shielding layer 4 is wound with tough copper monofilament outside the semi-conductive shielding layer 3, and a sheath 5 is extruded outside the shielding layer 4 with flame-retardant polyurethane elastomer material.

[0013] After the core filler 1 and several insulating cores 2 are twisted into a cable core, the insulating cores 2 are evenly arranged and will not be deformed due to extrusion when bent, thereby affecting the electrical performance of the insulation.

[0014] The winding structure of the shielding layer 4 can effectively reduce the interference of external electromagnetic signals.

[0015] The core filler 1 is a solid core structure and is formed by extrusion of TPE-E thermoplastic elastomer.

[0016] The insulated core 2 is composed of an insulating layer 2-2 extruded from the outside of the conductor 2-1. The conductor 2-1 is twisted from 40 0.05mm tough copper wire bundles, which ensures stable signal transmission while having excellent flexibility. The insulating layer 2-2 uses a TPE-E thermoplastic elastomer insulation layer, which has good electrical insulation properties, excellent fatigue resistance, good resilience, good mechanical properties, oil resistance, etc., which can ensure that the cable can stably transmit signals in harsh operating environments.

[0017] The semi-conductive shielding layer 3 is made of PVC material with semi-conductive properties, which can protect the insulation layer of the cable from damage, reduce the wear and mechanical damage of the cable, and extend the service life of the cable. The semi-conductive shielding layer 3 is conductive and can form a uniform electric field distribution in the cable, so that the voltage distribution inside the cable is uniform, thereby preventing partial discharge and breakdown of the cable. The semi-conductive shielding layer 3 can effectively shield the electromagnetic wave interference inside the cable.

[0018] The shielding layer 4 is made of wound tough copper monofilaments with a winding braiding density of more than 90%, which makes the cable have good anti-interference performance, reduces external electromagnetic interference, and makes the cable have good flexibility.

[0019] In order to protect the insulating core 2, a sheath 5 is extruded outside the shielding layer 4. The sheath 5 is made of thermoplastic flame-retardant polyurethane elastomer material, which has excellent low-temperature softness, UV resistance, mildew resistance, flame retardancy, hydrolysis resistance and other properties. It can ensure that the cable is suitable for various harsh environments such as resistance to engine oil, emulsifier, salt water, seawater, alkali, ozone and ultraviolet radiation, protect the internal insulating core 2 from damage, extend the service life of the cable, make the cable have excellent environmental resistance, and ensure that it can stably transmit signals in various harsh environments.

Claims

1. A highly flexible sensor cable resistant to mechanical vibration, characterized in that: The cable comprises a filling core (1), an insulating wire core (2), a semi-conductive shielding layer (3), a shielding layer (4) and a sheath (5), wherein a plurality of insulating wire cores (2) are arranged outside the filling core (1) to form a cable core, and the semi-conductive shielding layer (3), the shielding layer (4) and the sheath (5) are arranged outside the cable core in sequence.

2. The high-flexibility sensor cable resistant to mechanical vibration according to claim 1, characterized in that: The number of insulated wire cores (2) is 6.

3. The high-flexibility sensor cable resistant to mechanical vibration according to claim 1, characterized in that: The core filler (1) is a solid core structure and is made of TPE-E thermoplastic elastomer material.

4. The high-flexibility sensor cable resistant to mechanical vibration according to claim 1, characterized in that: The insulated wire core (2) is composed of a conductor (2-1) with an insulating layer (2-2) disposed outside the conductor (2-1), the conductor (2-1) being formed by twisting 40 0.05 mm tough copper wire bundles, and the insulating layer (2-2) being made of TPE-E thermoplastic elastomer material.

5. The high-flexibility sensor cable resistant to mechanical vibration according to claim 1, characterized in that: The semi-conductive shielding layer (3) is a PVC material with semi-conductive properties.

6. The high-flexibility sensor cable resistant to mechanical vibration according to claim 1, characterized in that: The shielding layer (4) is made of wound toughened copper monofilament.

7. The high-flexibility sensor cable resistant to mechanical vibration according to claim 1, characterized in that: The sheath (5) is made of thermoplastic flame-retardant polyurethane elastomer material.

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