A low-voltage power cable that is easy to detect

Abstract

The present invention relates to a low-voltage power cable which is easy to detect and is applied in the field of cable technology. The cable comprises a cable body and a built-in easy-to-check structure. The cable body comprises an insulating layer, an insulating layer, a filling layer and a sheath. The built-in easy-to-check structure comprises two sealing ends which are respectively fixedly mounted at both ends of the sheath. By setting the above-mentioned built-in easy-to-check structure, relevant technical personnel can use the built-in easy-to-check structure to quickly and accurately detect whether the sheath is damaged and cracks exist, which can greatly improve the detection efficiency and the detection accuracy, and further greatly improve the practicability, reliability and safety of the cable. In addition, the sealing layer in the built-in easy-to-check structure can also play a protective role for the conductor, the insulating layer and the like, and the built-in easy-to-check structure can also prevent relevant technical personnel from missing cracks when maintaining the sheath, which can not only further improve the safety of the cable, but also improve the practicability of the built-in easy-to-check structure.

Description

Technical Field

[0001] The invention relates to a low-voltage power cable, in particular to a low-voltage power cable which is applied in the field of cable technology and is easy to detect. Background Art

[0002] Power cables are cables used to transmit and distribute electrical energy. They are widely used in urban underground power grids, power station lead-out lines, and internal power supply for industrial and mining enterprises. Low-voltage power cables are a type of power cable used to transmit and distribute low-voltage electrical energy.

[0003] Low-voltage power cables are generally composed of conductors, insulation layers, filling layers, and sheaths. The sheath is the outermost layer of the cable, which is used to protect the cable from damage by the external environment. Low-voltage power cables in some usage scenarios will be dragged and moved during use, causing friction with the ground. Over time, the sheath is easily damaged. Once the sheath is damaged and cracks appear, humid air will enter the inside of the sheath through the cracks, affecting the safety of electricity use and greatly reducing the safety of the cable.

[0004] In order to ensure the safe operation of the cable, it is necessary to regularly check whether there are cracks in the sheath. However, the sheath inspection of low-voltage power cables in the prior art is very troublesome, and the inspection of whether there are cracks in the sheath mainly relies on manual inspection, which not only has low inspection efficiency but also has difficulty in ensuring accuracy. Therefore, we propose a low-voltage power cable that is easy to inspect. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the low-voltage power cable in the prior art is very troublesome to detect, and it is impossible to quickly and accurately detect whether there are cracks in the cable sheath.

[0006] To solve the above problems, the present invention provides a low-voltage power cable that is easy to detect, including a cable body and a built-in easy-to-check structure, the cable body including an insulating layer, an insulating layer, a filling layer, and a sheath, the built-in easy-to-check structure including two sealing ends respectively fixedly installed at both ends of the sheath, an air guide layer and a sealing layer fixedly connected between the two sealing ends, the air guide layer and the sealing layer are both configured as a circular tube, the air guide layer is located on the inner side of the sheath, and the sealing layer is located on the inner side of the air guide layer, an L-shaped air inlet pipe is embedded in one of the sealing ends, one end of the air inlet pipe is abutted against the air guide layer, and the other end of the air inlet pipe is connected to a sealing inspection seam cylinder, an elastic diaphragm is embedded through the outer wall of the sealing inspection seam cylinder away from one end of the air inlet pipe, the built-in easy-to-check structure also includes an inflation tube embedded through the sheath, the inflation tube is located in the middle of the sheath, and a sealing cover matching it is threadedly connected to the top of the inflation tube.

[0007] In the above-mentioned low-voltage power cable which is easy to detect, relevant technicians can use the built-in inspection structure to quickly and accurately detect whether the sheath is damaged and cracked, which can greatly improve the detection efficiency and accuracy, and thus greatly improve the practicality, reliability and safety of the cable.

[0008] As a further improvement of the present application, the insulating layer is coated on the outside of the conductor, the filling layer is filled between the insulating layer and the sealing layer, the air guide layer is made of a flexible breathable material, the sealing layer is made of a flexible sealing material, and the insulating layer passes through the sealing end and is sealed and fixedly connected thereto.

[0009] As a further improvement of the present application, an inflation check valve is provided on the inflation tube so that after inflation is stopped, air will not leak out through the inflation tube, thereby improving the accuracy of detection. An air outlet pipe is connected to the side wall of the sealed seam inspection tube, and one end of the air outlet pipe is threadedly connected to a matching pipe cover. After the detection is completed, the pipe cover is unscrewed to discharge excess air in the sealed seam inspection tube.

[0010] As another improvement of the present application, the low-voltage power cable is also equipped with a seam-fixing and inspection-aiding mechanism, which includes a sliding sealing sleeve encircling cylinder body, which is composed of two detachable semi-cylindrical semi-cylinder bodies, and both ends of the sliding sealing sleeve encircling cylinder body are provided with cable threading holes matching the sheath, and the sliding sealing sleeve encircling cylinder body is sleeved onto the sheath and can be slidably and sealedly connected to the sheath, and an air duct is connected to the outer wall of the sliding sealing sleeve encircling cylinder body, and a sealed pressure measuring cylinder is connected to the top of the air duct.

[0011] As another improvement supplement to the present application, a pressure sensor is fixedly installed on the top inner wall of the sealed pressure measuring cylinder, a pressure measuring plate is provided below the pressure sensor and is slidingly and sealingly connected to the sealed pressure measuring cylinder, a pair of suspension ropes are fixedly connected between the pressure measuring plate and the top inner wall of the sealed pressure measuring cylinder, a warning light is fixedly installed on the outer wall of the sealed pressure measuring cylinder, an exhaust pipe is connected to the side wall of the sealed pressure measuring cylinder, an exhaust valve is provided on the exhaust pipe, and the exhaust pipe is located below the pressure measuring plate.

[0012] As another improvement supplement to the present application, a fixed seam intelligent controller is fixedly installed in the sealed pressure measuring cylinder, and a fixed seam analysis module and a light control feedback module are provided in the fixed seam intelligent controller. The pressure sensor is connected to the fixed seam analysis module signal, the fixed seam analysis module is connected to the light control feedback module signal, and the light control feedback module is connected to the prompt light signal, so that the fixed seam inspection auxiliary mechanism can assist relevant technical personnel in locating the crack position.

[0013] To sum up, the present application provides a built-in inspection structure so that relevant technicians can quickly and accurately detect whether the sheath is damaged and has cracks through the built-in inspection structure, which can greatly improve the detection efficiency and detection accuracy, and thus greatly improve the practicality, reliability and safety of the cable. The sealing layer in the built-in inspection structure can also play a protective role for the conductor, insulation layer, etc., thereby further improving the safety of the cable. In addition, the built-in inspection structure can also prevent relevant technicians from missing cracks when maintaining the sheath, thereby improving the practicality of the built-in inspection structure; through the setting of the seam locating and inspection auxiliary mechanism, if there are cracks on the sheath, the seam locating and inspection auxiliary mechanism can assist relevant technicians in locating the crack position, so that relevant technicians can find all cracks faster and more accurately, thereby further improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of a low-voltage power cable that is easy to detect in the first embodiment of the present application;

[0015] Figure 2 This is a schematic diagram of a top cross-sectional structure of the sheath in the first embodiment of the present application;

[0016] Figure 3 This is a schematic cross-sectional structure diagram of the sealing end in the first embodiment of the present application;

[0017] Figure 4 This is a schematic cross-sectional view of the sealing seam inspection tube in the first embodiment of the present application;

[0018] Figure 5 This is a schematic cross-sectional view of the inflation tube in the first embodiment of the present application;

[0019] Figure 6 This is a schematic diagram of the three-dimensional structure of the seam detection auxiliary mechanism in the second embodiment of the present application;

[0020] Figure 7 This is a schematic cross-sectional view of the sliding seal sleeve enclosing the cylinder body in the second embodiment of the present application;

[0021] Figure 8 This is a schematic cross-sectional view of the sealed pressure measuring cylinder in the second embodiment of the present application;

[0022] Fig. 9 This is a system structure block diagram of the fixed seam intelligent controller in the second embodiment of the present application.

[0023] Description of the numbers in the figure:

[0024] 101. Conductor; 102. Insulating layer; 103. Filling layer; 104. Sheath; 201. Sealing end; 202. Air guide layer; 203. Sealing layer; 204. Air inlet pipe; 205. Sealed seam inspection tube; 206. Elastic diaphragm; 207. Inflatable tube; 208. Sealing cover; 209. Inflatable one-way valve; 210. Air outlet pipe; 211. Tube cover; 301. Sliding sealing sleeve around the cylinder body; 302. Air guide tube; 303. Sealed pressure measuring tube; 304. Pressure sensor; 305. Pressure measuring plate; 306. Suspension rope; 307. Warning light; 308. Cable threading hole; 309. Exhaust pipe; 310. Exhaust valve; 004. Fixed seam intelligent controller. DETAILED DESCRIPTION

[0025] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0026] The first implementation method:

[0027] Figure 1-5 A low-voltage power cable that is easy to detect is shown, including a cable body and a built-in inspection structure. The cable body includes an insulating layer 102, an insulating layer 102, a filling layer 103, and a sheath 104. The built-in inspection structure includes two sealed end heads 201 respectively fixedly installed at both ends of the sheath 104, and an air guide layer 202 and a sealing layer 203 are fixedly connected between the two sealed end heads 201. The air guide layer 202 and the sealing layer 203 are both configured as a circular tube. The air guide layer 202 is located on the inner side of the sheath 104, and the sealing layer 203 is located on the inner side of the air guide layer 202. The insulating layer 102 is coated on the outer side of the conductor 101, and the filling layer 103 is filled between the insulating layer 102 and the sealing layer 203. 202 is made of flexible breathable material, the sealing layer 203 is made of flexible sealing material, the insulating layer 102 passes through the sealing end 201 and is sealed and fixedly connected thereto, an L-shaped air inlet pipe 204 is embedded on one of the sealing end heads 201, one end of the air inlet pipe 204 is against the air guide layer 202, and the other end of the air inlet pipe 204 is connected to a sealing inspection seam cylinder 205, and an elastic diaphragm 206 is embedded and penetrated on the outer wall of the sealing inspection seam cylinder 205 away from the end of the air inlet pipe 204, and the built-in inspection structure also includes an inflation tube 207 that passes through and is embedded in the sheath 104, the inflation tube 207 is located in the middle of the sheath 104, and the top end of the inflation tube 207 is threadedly connected with a matching sealing cover 208.

[0028] When inspecting whether the sheath 104 is damaged or cracked, unscrew the sealing cap 208, and use a suitable method to fill the inner side of the sheath 104 with dry and clean air through the inflation tube 207. The air can flow along the air guide layer 202, so that air will flow into the sealing seam inspection cylinder 205 through the air inlet pipe 204, causing the air pressure in the sealing seam inspection cylinder 205 to increase. The increase in air pressure will cause the elastic diaphragm 206 to bulge upward and deform. After the elastic diaphragm 206 has an obvious upward bulge deformation, stop inflating. After a certain period of time, observe the elastic diaphragm 206. If the deformation degree of the elastic diaphragm 206 is significantly reduced, If the elastic diaphragm 206 is slightly or even completely rebounded, it means there is air leakage, which means there is a crack on the sheath 104 and the cable needs to be maintained or replaced. The faster the rebound recovery speed is, the larger or more cracks there are. On the contrary, if the elastic diaphragm 206 hardly rebounds and its deformation is still very obvious, it means that the sheath 104 is in good condition and has no cracks, and its protective effect is still effective and reliable. In addition, when air is filled into the inner side of the sheath 104, if after a certain period of time, the elastic diaphragm 206 still does not produce obvious upward convex deformation, it also means that there are cracks on the sheath 104. Moreover, the damage of the sheath 104 may be serious, with large or more cracks. Therefore, by setting up the built-in inspection structure, relevant technicians can quickly and accurately detect whether the sheath 104 is damaged and has cracks through the built-in inspection structure, which can greatly improve the detection efficiency and detection accuracy, thereby greatly improving the practicality, reliability and safety of the cable. The sealing layer 203 in the built-in inspection structure can also protect the conductor 101, the insulating layer 102, etc., thereby further improving the safety of the cable. In addition, if the detection result is that the sheath 104 is damaged, the insulation layer 102 can be used to protect the conductor 101, the insulation layer 102, etc., thereby further improving the safety of the cable. If cracks exist, relevant technicians can carefully check the sheath 104, find all the cracks, and perform corresponding maintenance on the cracks. After the maintenance is completed, the sheath 104 can be inspected again through the built-in inspection structure. If the inspection result shows that cracks still exist on the sheath 104, it means that some small cracks that are not easy to find may be missed, which can prompt relevant technicians to check the sheath 104 again, find these missed cracks and maintain them. The built-in inspection structure can also prevent relevant technicians from missing cracks when maintaining the sheath 104.

[0029] See also Figure 1 and Figure 5 An inflation check valve 209 is provided on the inflation tube 207 so that after the inflation is stopped, the air will not leak out through the inflation tube 207, thereby improving the accuracy of the detection. An air outlet pipe 210 is connected to the side wall of the sealed seam inspection cylinder 205, and one end of the air outlet pipe 210 is threadedly connected to a matching pipe cover 211. After the detection is completed, the pipe cover 211 is unscrewed to discharge the excess air in the sealed seam inspection cylinder 205.

[0030] The second implementation method:

[0031] Figure 6-9 A low-voltage power cable that is easy to detect is shown. Different from the first embodiment, the low-voltage power cable is also equipped with a fixed-seam inspection auxiliary mechanism, which includes a sliding seal sleeve body 301. The sliding seal sleeve body 301 is composed of two detachable semi-cylindrical semi-cylinders. Both ends of the sliding seal sleeve body 301 are provided with cable threading holes 308 that match the sheath 104. The sliding seal sleeve body 301 is sleeved on the sheath 104 and can be slidably and sealedly connected to the sheath 104. An air guide tube 302 is connected to the outer wall of the sliding seal sleeve body 301, and a sealed pressure measuring tube 303 is connected to the top of the air guide tube 302. A pressure sensor 304 is fixedly installed on the inner wall of the top end of the sealed pressure measuring tube 303, and a pressure sensor 304 is provided below the pressure sensor 304. The sealed pressure measuring cylinder 303 is slidably and sealedly connected to a pressure measuring plate 305, a pair of suspension ropes 306 are fixedly connected between the pressure measuring plate 305 and the inner wall of the top end of the sealed pressure measuring cylinder 303, a warning light 307 is fixedly installed on the outer wall of the sealed pressure measuring cylinder 303, an exhaust pipe 309 is connected to the side wall of the sealed pressure measuring cylinder 303, an exhaust valve 310 is arranged on the exhaust pipe 309, the exhaust pipe 309 is located below the pressure measuring plate 305, a fixed seam intelligent controller 004 is fixedly installed in the sealed pressure measuring cylinder 303, a fixed seam analysis module and a light control feedback module are arranged in the fixed seam intelligent controller 004, the pressure sensor 304 is signal-connected to the fixed seam analysis module, the fixed seam analysis module is signal-connected to the light control feedback module, and the light control feedback module is signal-connected to the warning light 307.

[0032] After the detection is completed, if there are cracks on the sleeve 104, the sliding seal sleeve body 301 is mounted on the sleeve 104 (when mounting the sliding seal sleeve body 301, the two half-cylinders can be separated and mounted on the sleeve 104 respectively, and then the two half-cylinders are aligned and fitted), and the two half-cylinders are fixed together with sealing tape, and then air is continuously filled into the inner side of the sleeve 104 through the inflation tube 207. If there are cracks on this section of the sleeve 104 on the inner side of the sliding seal sleeve body 301, part of the air will leak through the crack to the inner side of the sliding seal sleeve body 301, so that air will flow into the sealed pressure measuring cylinder 303 through the air guide tube 302, causing the air pressure under the pressure measuring plate 305 to increase, thereby causing the pressure measuring plate 305 to squeeze the pressure sensor 304, causing When the pressure sensor 304 detects the pressure data, the fixed seam analysis module will send a signal to the light control feedback module, causing the light control feedback module to light up the prompt light 307, so that the relevant technical personnel can see that the prompt light 307 is lit and know that there is a crack on the sheath 104 located on the inner side of the sliding sleeve cylinder body 301. After the relevant technical personnel observe that the prompt light 307 is lit, they stop inflating and open the exhaust valve 310 to discharge the excess air in the sealed pressure measuring cylinder 303, so that the air pressure under the pressure measuring plate 305 returns to normal. After the air pressure under the pressure measuring plate 305 returns to normal, the pressure measuring plate 305 will no longer squeeze the pressure sensor 304, and the fixed seam analysis module will send a signal to the light control feedback module to turn off the prompt light 307. After the warning light 307 is turned off, the exhaust valve 310 is closed and a corresponding mark is made on this section of the sheath 104 (the relevant technical personnel can conduct further inspections based on the mark later), and then the sliding sleeve body 301 is slid along the sheath 104 for a certain distance (the sliding distance should be less than the length of the sliding sleeve body 301), and the next section of the sheath 104 can be inspected. On the contrary, if the warning light 307 is still not lit after a certain period of time, it means that there is no crack on this section of the sheath 104 on the inner side of the sliding sleeve body 301 at this time, and the sliding sleeve body 301 can be directly slid to inspect the next section of the sheath 104. In addition, after the relevant technical personnel observe that the warning light 307 is lit, they can also just stop inflating without opening the exhaust valve 310 first. Instead, it waits for a while. If there are also cracks on the sheath 104 located outside the sliding seal sleeve cylinder body 301, after stopping inflation, air will leak from other cracks, and the air pressure below the pressure measuring plate 305 will automatically return to normal, causing the light control feedback module to turn off the prompt light 307. On the contrary, if there are no cracks on the sheath 104 located outside the sliding seal sleeve cylinder body 301, the prompt light 307 will not be turned off. In this case, the relevant technical personnel do not need to check the next section of the sheath 104, which can improve the inspection efficiency. Therefore, through the setting of the seam detection auxiliary mechanism, if there are cracks on the sheath 104, the seam detection auxiliary mechanism can assist the relevant technical personnel in locating the crack position, so that the relevant technical personnel can find all the cracks faster and more accurately.This can further improve the detection efficiency.

[0033] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A low-voltage power cable that is easy to detect, comprising a cable body and a built-in inspection structure, wherein the cable body comprises an insulating layer (102), an insulating layer (102), a filling layer (103), and a sheath (104), characterized in that: The built-in stool inspection structure comprises two sealing end heads (201) respectively fixedly mounted on two ends of the sheath (104); an air-conducting layer (202) and a sealing layer (203) are fixedly connected between the two sealing end heads (201); the air-conducting layer (202) and the sealing layer (203) are both configured as circular tubes; the air-conducting layer (202) is located on the inner side of the sheath (104); the sealing layer (203) is located on the inner side of the air-conducting layer (202); an L-shaped air intake pipe (204) is embedded on one of the sealing end heads (201); one end of the air intake pipe (204) abuts against the air intake layer (202); the other end of the air intake pipe (204) is connected to a sealing inspection seam tube (205); an elastic diaphragm (206) is embedded through the outer wall of the sealing inspection seam tube (205) at the end away from the air intake pipe (204); the built-in stool inspection structure also comprises an air-filled inflatable gasket (206) embedded through the outer wall of the inflatable gasket (206) embedded on the sheath (104); The gas-filled tube (207) is located in the middle of the sheath (104), the top end of the gas-filled tube (207) is threadedly connected to a sealing cap (208) matching the gas-filled tube (207), the insulating layer (102) is coated on the outside of the conductor (101), the filling layer (103) is filled between the insulating layer (102) and the sealing layer (203), the gas-conducting layer (202) is made of a flexible breathable material, and the sealing layer (203) is made of The insulating layer (102) is made of a flexible sealing material, and passes through the sealing end (201) and is sealed and fixedly connected thereto. When detecting whether the sheath (104) is damaged or cracked, the sealing cover (208) is unscrewed, and air is filled into the inner side of the sheath (104) through the inflation tube (207), causing the elastic diaphragm (206) to bulge upward and deform. Then, it is observed whether the elastic diaphragm (206) rebounds and recovers, so as to determine whether the sheath (104) is damaged or cracked.

2. A low-voltage power cable that is easy to detect according to claim 1, characterized in that: The inflation tube (207) is provided with an inflation check valve (209), and the side wall of the sealing seam inspection cylinder (205) is connected to an air outlet tube (210), and one end of the air outlet tube (210) is threadedly connected to a matching tube cover (211).

3. A low-voltage power cable that is easy to detect according to claim 1, characterized in that: The low-voltage power cable is also equipped with a seam-fixing and inspection-assisting mechanism, which comprises a sliding seal sleeve body (301), the sliding seal sleeve body (301) consisting of two detachable semi-cylindrical half-cylinders, both ends of the sliding seal sleeve body (301) are provided with cable threading holes (308) matching the sheath (104), the sliding seal sleeve body (301) is sleeved onto the sheath (104) and is connected to the sheath (104) in a sliding and sealing manner, the outer wall of the sliding seal sleeve body (301) is connected to an air guide tube (302), and the top end of the air guide tube (302) is connected to a sealed pressure measuring tube (303).

4. A low-voltage power cable that is easy to detect according to claim 3, characterized in that: A pressure sensor (304) is fixedly mounted on the inner wall at the top end of the sealed pressure measuring cylinder (303); a pressure measuring plate (305) is provided below the pressure sensor (304) and is slidably and hermetically connected to the sealed pressure measuring cylinder (303); a pair of suspension ropes (306) are fixedly connected between the pressure measuring plate (305) and the inner wall at the top end of the sealed pressure measuring cylinder (303); and a warning light (307) is fixedly mounted on the outer wall of the sealed pressure measuring cylinder (303).

5. A low-voltage power cable that is easy to detect according to claim 4, characterized in that: A fixed seam intelligent controller (004) is fixedly installed in the sealed pressure measuring cylinder (303), and a fixed seam analysis module and a light control feedback module are provided in the fixed seam intelligent controller (004). The pressure sensor (304) is signal-connected to the fixed seam analysis module, the fixed seam analysis module is signal-connected to the light control feedback module, and the light control feedback module is signal-connected to the prompt light (307).

6. A low-voltage power cable that is easy to detect according to claim 4, characterized in that: The side wall of the sealed pressure measuring cylinder (303) is connected to an exhaust pipe (309), and an exhaust valve (310) is provided on the exhaust pipe (309). The exhaust pipe (309) is located below the pressure measuring plate (305).

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