Graded alarm cable

Abstract

The utility model discloses a graded alarm cable, which comprises a cable body, the cable body comprises an outer sheath and a core wire unit positioned in the outer sheath, and an inner alarm unit and an outer alarm unit are arranged in the cable body; the inner alarm unit is formed by twisting an alarm wire and a sensitive wire, and the sensitive wire is composed of a bare metal wire and water-soluble plastic; the outer alarm unit is composed of a sensitive layer, an alarm line and a metal layer. According to the utility model, different alarm units are arranged in the cable to detect the invasion degree of moisture, so that the purpose of graded alarm is realized, specifically, the inner alarm unit and the outer alarm unit are arranged in the cable body, and each alarm unit is composed of a sensitive layer made of water-soluble plastic, an alarm wire belt separated by the sensitive layer and a metal layer. Whether the interior of the cable is affected with damp and damaged or not is detected by utilizing the characteristics of insulation between the alarm wire and the metal layer in a dry environment and conduction between the alarm wire and the metal layer in a humid environment, an alarm can be given in time, and an automatic damp detection and alarm function in the cable is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable technical field especially relates to a hierarchical alarm cable. BACKGROUND

[0002] At present, the cable will appear the condition that the outer skin is broken and the moisture invades in the laying and use, this can lead to the cable insulation gradually drops, the cable short circuit appears the major accident when serious.

[0003] In order to prevent the outer skin breakage from leading to the moisture invasion insulation reduction, the line maintenance personnel carries out the test to find regularly to the insulation cable, this method needs to disconnect the joint box of both ends of the cable and carries out the test, it is more troublesome.

[0004] Because the cable is very long, some broken area is small and not easy to find or the position is inconvenient to detect (the cable is located in high altitude, underground, pipeline etc.), and the detection is usually tested once every certain time, and has hysteresis. Finding the broken point in time can help discover the cause of the damage in advance and avoid greater losses.

[0005] Although there are products, patents and other fault detection products on the market, there are no cables that can determine the damage degree of the cable, classify the fault level (no need to disconnect the power, use after disconnecting the power, need to disconnect the power), and facilitate the operator to take different measures (such as continue to use, repair and use, and cannot use) according to the fault level. INVENTION CONTENTS

[0006] The utility model aims at providing a kind of hierarchical alarm cable, which can facilitate the detection of cable damage degree and provide alarm function.

[0007] The utility model employs the technical scheme that:

[0008] A hierarchical alarm cable includes a cable body, which includes an outer sheath and a core wire unit located inside the outer sheath. The cable body has an inner alarm unit and an outer alarm unit. The inner alarm unit alarm wire and sensitive wire are twisted together. The sensitive wire is composed of bare metal wire and water-soluble plastic.

[0009] The outer alarm unit is composed of a sensitive layer, an alarm wire and a metal layer. The core wire unit contains, from the outside to the inside, a sensitive layer, a metal layer, an isolation layer, a wire core and an insulation layer, and a conductor. The sensitive layer is made of water-soluble plastic and tightly covers the surface of the metal layer. The alarm wire is arranged between the outer sheath and the sensitive layer. The alarm wire can be a bare metal wire or a wire core with periodic insulation damage on the outer surface of the internal metal conductor. It is tightly placed on the other surface of the sensitive layer and does not contact other metal structures. The sensitive layer separates the alarm wire and the metal layer through an alarm device.

[0010] The sensitive layer material is PVA water-soluble plastic.

[0011] The sensitive layer is wrapped by a wrapping machine or extruded by an extruder.

[0012] The alarm lines are multiple, placed along the cable direction on the surface of the sensitive layer or wound on the surface of the sensitive layer with a certain pitch, circular or elliptical or rectangular, single conductor or stranded conductor or metal strip.

[0013] The cable core is single or stranded, tightly packed or containing gaps.

[0014] The metal layer is single / multiple metal combination in non-sealed form or single / multiple metal combination in sealed form.

[0015] The alarm device is connected by an alarm and a power line, one end of the alarm device is connected with the alarm line through the power line, and the other end is connected with the metal layer through the power line.

[0016] The cable body is a cable body or an optical cable body.

[0017] The utility model discloses a different alarm unit is arranged in the cable, detects the invasion degree of moisture, thereby realizes the purpose of grading alarm, specifically, in the cable body, the inner alarm unit and outer alarm unit adopt the sensitive layer made of water soluble plastic and the alarm line band and metal layer separated by the sensitive layer and form the alarm unit, utilize the insulation between the alarm line and the metal layer in dry environment, the conductive characteristics between the alarm line and the metal layer in humid environment, detect whether the cable is damp and damaged, and can timely alarm, realize the damp automatic detection alarm function in the cable, do not need manual detection, guarantee the operation stability and system safety of cable. Further, a plurality of alarm lines are evenly distributed, which can more efficiently detect the moisture invasion, prevent a single alarm line from being unable to detect in time when it is damaged or at a high position. When wound on the surface of the sensitive layer with a certain pitch, the bending performance of the cable can be ensured to be better, and the conductor can be prevented from being stretched and broken. ACCURACY

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0019] Figure 1 It is the structural schematic diagram of the utility model;

[0020] Figure 2The structure diagram of the alarm device is shown in the utility model. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model. Apparently, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without any creative effort belong to the protection scope of the utility model.

[0022] As shown in Figure 1 and 2 The utility model discloses a cable body, cable body includes the outer sheath 8 and the core wire unit in the outer sheath 8, and there is inner alarm unit and outer alarm unit in the cable body, the inner alarm unit is twisted by alarm wire 7 and sensitive wire 10, and the sensitive wire 10 is composed of bare metal conductor and water soluble plastic, and the water soluble plastic is covered on the outside of the bare metal conductor, the alarm wire 7 can be the bare metal conductor, also can be the wire core of the periodic breakage of the insulating surface of the internal metal conductor, the alarm wire 7 and sensitive wire 10 are connected by alarm device, when the moisture or water enters the inner layer, the water soluble plastic of sensitive wire 10 will melt, causes the electrical connection of the alarm wire 7 and the bare metal conductor of sensitive wire 10, and then alarm device is converted to the on state from the off state, and starts the alarm.

[0023] The outer alarm unit is composed of sensitive layer 6, alarm wire 7 and metal layer 5, the core wire unit successively contains sensitive layer 6, metal layer 5, isolation layer 4, wire core 3, insulating layer 2 and conductor 1 from outside to inside, the sensitive layer 6 adopts water soluble plastic, and is tightly covered on the surface of metal layer 5, the alarm wire 7 is arranged between the outer sheath 8 and sensitive layer 6, the alarm wire 7 can be the bare metal conductor, also can be the wire core of the periodic breakage of the insulating surface of the internal metal conductor, and is tightly arranged on the other surface of sensitive layer 6 and does not contact other metal structures, the sensitive layer 6 separates alarm wire 7 and metal layer 5, and is connected by alarm device.

[0024] The sensitive layer 6 is made of water-soluble plastic, and the alarm device 9 is connected by an alarm 9-1 and a power line 9-2. One end of the alarm device is connected with the alarm line 7 through the power line 9-2, and the other end is connected with the metal layer 5 through the power line 9-2. When the water-soluble plastic contacts moisture and water, the plastic is dissolved, the alarm line and the metal layer separated by the water-soluble plastic layer are short-circuited, the alarm device is started, and relevant personnel are reminded to handle such a fault. The alarm unit composed of the sensitive layer made of water-soluble plastic and the alarm line and the metal layer separated by the sensitive layer utilizes the insulation between the alarm line and the metal layer in a dry environment and the electrical conductivity between the alarm line and the metal layer in a humid environment to detect whether the cable is damp and damaged, and timely alarm is realized, so that the automatic detection and alarm function of the cable in the damp state are realized, manual detection is not needed, and the stable operation of the cable and the safety of the system are ensured.

[0025] The sensitive layer 6 is made of water-soluble plastic, and the alarm device 9 is connected by an alarm 9-1 and a power line 9-2. One end of the alarm device is connected with the alarm line 7 through the power line 9-2, and the other end is connected with the metal layer 5 through the power line 9-2. When the water-soluble plastic contacts moisture and water, the plastic is dissolved, the alarm line and the metal layer separated by the water-soluble plastic layer are short-circuited, the alarm device is started, and relevant personnel are reminded to handle such a fault. The alarm unit composed of the sensitive layer made of water-soluble plastic and the alarm line and the metal layer separated by the sensitive layer utilizes the insulation between the alarm line and the metal layer in a dry environment and the electrical conductivity between the alarm line and the metal layer in a humid environment to detect whether the cable is damp and damaged, and timely alarm is realized, so that the automatic detection and alarm function of the cable in the damp state are realized, manual detection is not needed, and the stable operation of the cable and the safety of the system are ensured.

[0026] The alarm line 7 is a plurality of alarm lines, which can be placed on the surface of the sensitive layer in the cable direction, can be wound on the surface of the sensitive layer at a certain pitch, can be circular, oval, rectangular or other shapes, and can be a single conductor, a twisted conductor or a metal strip. The plurality of alarm lines are uniformly distributed, so that the moisture invasion can be more efficiently detected, and the single alarm line cannot be timely detected when the single alarm line is damaged or is at a high position. When the alarm lines are wound on the surface of the sensitive layer at a certain pitch, the bending performance of the cable is better, and the conductor is prevented from being excessively stretched and broken.

[0027] The cable core 3 can be a single wire core or a plurality of wire cores twisted together, and can be a tightly packed type or a gap-containing non-packed type.

[0028] The metal layer 5 can be a single / multi-layer metal combination in a non-sealed form (such as a double-steel-belt gap armored layer) or a single / multi-metal combination in a sealed form (such as an aluminum sheath welded layer). The non-sealed form can save more materials, but moisture can penetrate through the gap; the sealed form can better isolate moisture, but the process is complex and the material cost is high.

[0029] The utility model can monitor the degree of cable surface damage and moisture invasion in real time, facilitate the operation personnel to judge whether the system can continue to operate, whether it is necessary to immediately cut off the power supply, especially in some places where the power supply cannot be immediately cut off, the risk is controlled, and the loss is reduced (for example, the outer layer is damaged, the inner layer is not broken, the power supply can be continued, the outer layer is repaired after the power supply is cut off; the inner layer is damaged, and it is suggested that the power supply be cut off for maintenance or the cable be replaced).

[0030] The utility model discloses in actual use, still include processor for judging the alarm information of alarm device, thereby according to the multi -layer humidity detection alarm unit of adoption, the humidity detection unit from outside to inside judges which level of moisture invasion, through the signal of feedback classifies to failure, thereby can through different classification level to the prompt of next operation of auxiliary operator.

[0031] Further, the optical fiber can be placed in the cable core 3, since the optical fiber is easily damaged, the optical fiber placed here can effectively isolate external mechanical damage and prevent the optical fiber from breaking during and before laying.

[0032] In the description of the utility model, it is to be explained that for the orientation words, if the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and are not indicative or suggestive of the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the utility model.

[0033] It should be noted that the terms "include" and "have" and any variations thereof in the specification and claims of the present application are intended to cover the non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0034] Note that the above is only the preferred embodiment of the utility model and the application of technical principles. Those skilled in the art will understand that the utility model is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the protection scope of the utility model. Therefore, although the utility model is described in more detail through the above embodiments, the utility model is not limited to the specific embodiments described herein, and can include more other effective embodiments without departing from the utility model concept, and the scope of the utility model is determined by the appended claims.

Claims

1. A graded alarm cable, characterized in that: The cable body includes an outer sheath and a core wire unit located inside the outer sheath. The cable body contains an inner alarm unit and an outer alarm unit. The inner alarm unit is composed of an alarm wire and a sensitive wire twisted together. The sensitive wire is composed of bare metal wire and water-soluble plastic. The external alarm unit consists of a sensitive layer, an alarm wire, and a metal layer. The core wire unit, from the outside in, includes a sensitive layer, a metal layer, an isolation layer, a wire core, an insulation layer, and a conductor. The sensitive layer is made of water-soluble plastic and is tightly wrapped around the surface of the metal layer. The alarm wire is positioned between the outer sheath and the sensitive layer. The alarm wire can be a bare metal conductor or a wire core with periodically damaged insulation on the outer surface of an internal metal conductor, tightly wrapped around the other surface of the sensitive layer and not in contact with other metal structures. The alarm wire and the metal layer, separated by the sensitive layer, are connected by an alarm device.

2. The graded alarm cable according to claim 1, characterized in that: The sensitive layer material is PVA water-soluble plastic.

3. The graded alarm cable according to claim 1, characterized in that: The sensitive layer is formed by wrapping the packaging tape around the metal layer using a wrapping machine or by extruding plastic onto the metal layer using an extruder.

4. The graded alarm cable according to claim 1, characterized in that: The alarm wires are multiple; they are laid along the cable direction on the surface of the sensitive layer or wound around the surface of the sensitive layer at a certain pitch; they are circular, elliptical or rectangular; they are single conductors or stranded conductors or metal strips.

5. The graded alarm cable according to any one of claims 1-4, characterized in that: The cable core is a single wire core or a strand of multiple wire cores; it is either a tightly packed type or a type with gaps and no filling.

6. The graded alarm cable according to claim 5, characterized in that: The metal layer can be a single-layer / multi-layer metal combination in a non-sealed form or a single metal / multiple metal combination in a sealed form.

7. The graded alarm cable according to claim 5, characterized in that: The alarm device consists of an alarm and a power cord. One end of the alarm device is connected to the alarm line via the power cord, and the other end is connected to the metal layer via the power cord.

8. The graded alarm cable according to claim 5, characterized in that: The cable body mentioned is either a cable body or an optical fiber body.

Images