Medium voltage fire resistant cable and method of connecting same

Abstract

The application discloses a kind of medium voltage fireproof cable, it is related to cable technical field, including outer skin and multiple rotating rods;Cable assembly, the cable assembly is fixedly connected in outer skin inner surface, the cable assembly includes multiple first rubber pads, multiple first rubber pad outer surfaces are all fixedly connected with first support sheet, and multiple first support sheet outer surfaces are all fixedly connected with honeycomb panel.In the application, after sealing cover is removed, nitrogen or carbon dioxide and other inert gases can be filled into hollow tube inside through air supplementing pipe, and after air pipe is completed, hollow tube in hollow state is the outermost support of cable, and it plays a heat-insulating role for inner layer cable.When short-circuit high temperature in cable, high-temperature contact point of hollow tube will be melted, and after hollow tube is melted and damaged, inert gas filled in air pipe interior is sprayed from damaged part, which can play a flame-retardant role, and provide better fireproof performance for cable.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a medium-voltage fireproof cable and its connection method. Background Technology

[0002] A cable is a device for transmitting electrical energy or signals, usually consisting of several or groups of conductors. Medium-voltage cables are cables used to transmit power in medium-voltage power systems. They are insulated cables that can reliably transmit electrical energy under medium-voltage conditions.

[0003] In the existing technology, in order to ensure the safe use of medium-voltage cables, multiple layers of flame-retardant protective layers are usually set on the outside of the cable to improve the fire resistance of the cable. However, when the flame-retardant protective layers are multiple and thick, the production and transportation costs of the cable are high. At the same time, when the inner core of the cable is short-circuited and the temperature is high, the innermost layer of the cable will still burn due to the high temperature, and it cannot play a good protective role.

[0004] Therefore, we propose a medium-voltage fireproof cable and its connection method to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a medium-voltage fireproof cable and its connection method to solve the problem mentioned in the background art that when the innermost cable core is short-circuited and reaches high temperature, the innermost cable will still burn due to high temperature and cannot play a good protective role.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a medium-voltage fireproof cable, comprising an outer sheath and multiple rotating rods; a cable assembly, wherein the cable assembly is fixedly connected to the inner surface of the outer sheath, the cable assembly comprising multiple first rubber pads, each of the multiple first rubber pads having a first support plate fixedly connected to its outer surface, each of the multiple first support plates having a honeycomb plate fixedly connected to its outer surface, each of the multiple honeycomb plates having a second support plate fixedly connected to its outer surface, each of the multiple second support plates having a second rubber pad fixedly connected to its outer surface, and a wear-resistant layer fixedly connected between the outer surfaces of the multiple second rubber pads. A filler layer is provided on the inner surface of the wear-resistant layer, and an inner core is fixedly connected to the inner surface of the filler layer. Multiple flame-retardant layers are uniformly fixedly connected to the inner surface of the filler layer, and shielding layers are fixedly connected to the inner surfaces of the multiple flame-retardant layers. Cable cores are fixedly connected to the inner surfaces of the multiple shielding layers. A fireproof component is sleeved on the outer surface of the outer sheath. The fireproof component includes a fixed sleeve film layer, and a hollow tube is fixedly connected to the outer surface of the film layer. A fixing component is provided, with two fixing components symmetrically fixedly connected to the outer surface of the hollow tube. The fixing component includes two splicing blocks.

[0007] Preferably, the outer surface of the first rubber pad near the outer sheath is arc-shaped, and the outer surface of the second rubber pad near the insulation layer is arc-shaped. The inner core is located inside the cable core and at the center of the filling layer. The thickness of the honeycomb panel is greater than the thickness of the first and second rubber pads, and the thickness of the first and second rubber pads is greater than the thickness of the first and second support sheets. When the honeycomb panel is under pressure, the pressure can be buffered by the deformation of the first and second rubber pads, thus improving the compressive strength of the honeycomb panel.

[0008] Preferably, the hollow tube is located inside the groove, the inner surface of the film layer is attached to the inner surface of the groove, and an air supply tube is fixedly connected to the outer surface of the hollow tube. The air supply tube is connected to the hollow tube in a communicating manner, and a sealing cap is threaded to the outer surface of the air supply tube. After the air tube is fully inflated, the hollow tube in its hollow state becomes the outermost support of the cable, thus providing heat insulation for the inner cable.

[0009] Preferably, a plurality of support rings are fixedly connected at equal intervals on the inner surface of the hollow tube, the outer surface of the support rings is in contact with the inner surface of the hollow tube, and a plurality of ventilation holes are uniformly opened on the outer surface of the support rings. By setting the support rings, the inner wall of the hollow tube can be supported, thereby improving the compressive strength of the hollow tube.

[0010] Preferably, one of the splicing blocks has a first connecting block symmetrically fixedly connected to its outer surface, and the other splicing block has a second connecting block symmetrically fixedly connected to its outer surface. The outer surfaces of the splicing blocks are symmetrically provided with splicing holes. When splicing and installing multiple splicing blocks, the two parallel splicing blocks can be locked and fixed with bolts by means of the splicing holes.

[0011] Preferably, a positioning ring is symmetrically fixedly connected to one outer surface of the splicing block, and the positioning ring is located outside the splicing hole. A positioning groove is symmetrically opened on the other outer surface of the splicing block, and the positioning groove is located outside the splicing hole. The outer surface of the positioning ring is inserted into the inner surface of the positioning groove. The cooperation between the positioning ring and the positioning groove plays an auxiliary positioning role, so that the splicing blocks on both sides can be kept in a horizontal position to complete the splicing and fixing.

[0012] Preferably, the outer surface of the first connecting block has a slot, the inner surface of the slot is rotatably connected to a support shaft, the outer surface of the support shaft is fixedly connected to a rotating block, the outer surface of the rotating block is fixedly connected to a screw, and the outer surface of the screw is threaded with a nut. Through the setting of the support shaft, the rotating block can drive the screw to rotate freely.

[0013] Preferably, the outer surface of the second connecting block has a slot, the screw is located inside the slot, the nut is located on the lower side of the second connecting block, and the cross-section of the nut is larger than the cross-section of the slot. The installation operation is performed by directly rotating the screw, without the need to remove the installation parts separately, making the installation operation more convenient and quick.

[0014] Preferably, the splicing block has multiple evenly spaced locking holes on its outer surface near the positioning groove. The rotating rod is located between the inner surfaces of two locking holes. A circular groove is formed at the bottom of the locking hole, and a ball bearing is provided on the inner surface of the circular groove. A collar is fitted on the outer surface of the rotating rod. When a rat gnaws on the cable, the rat lies on the surface of the cable, and the collar will rotate, preventing the rat from lying on the cable to gnaw. This effectively prevents the cable from being gnawed by rats and provides good protection.

[0015] A method for connecting medium-voltage fire-resistant cables includes the following steps:

[0016] S1. When the cable is connected and installed, the first rubber pad, the first support plate, the honeycomb plate, the second support plate and the second rubber pad provide overhead support for the cable between the outer sheath and the insulation layer. When the cable is subjected to external pressure, the pressure on the outer layer of the cable will be transmitted to the cable core through the honeycomb plate, which can effectively reduce the external pressure on the cable core and play a good role in pressure protection of the cable core.

[0017] S2. After the sealing cap is removed, inert gases such as nitrogen or carbon dioxide can be filled into the hollow tube through the air filling tube. After the air tube is filled, the hollow tube in its hollow state becomes the outermost support of the cable, which plays a heat insulation role for the inner cable. When there is a short circuit and high temperature inside the cable, the high temperature contact point of the hollow tube will melt. After the hollow tube melts and breaks, the inert gas filled inside the air tube will be sprayed out from the broken point, which can play a flame-retardant role and provide the cable with good fire resistance.

[0018] S3. After rotating the screw to the inner position of the slot, tighten the nut onto the screw. Tightening the nut will clamp and fix the screw to the lower position of the second connecting block, thus completing the installation and fixing of the two splicing blocks. The installation operation is carried out by directly rotating the screw, without the need to remove the installation parts separately, making the installation operation more convenient and quick.

[0019] S4. By uniformly installing freely rotating rods and collars around the outside of the cable, when rats gnaw on the cable, the collars will rotate, preventing the rats from gnawing on the cable and thus providing good protection against rats.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. During use, after removing the sealing cap, inert gases such as nitrogen or carbon dioxide can be filled into the hollow tube through the air filling tube. After the air tube is filled, the hollow tube becomes the outermost support of the cable, providing heat insulation for the inner cable. When there is a short circuit and high temperature inside the cable, the high-temperature contact point of the hollow tube will melt. After the hollow tube melts and breaks, the inert gas filled inside the air tube will be sprayed out from the broken point, which can play a flame-retardant role and provide the cable with good fire resistance.

[0022] 2. During use, the first rubber pad, the first support plate, the honeycomb plate, the second support plate, and the second rubber pad provide overhead support for the cable between the outer sheath and the insulation layer. After the cable is installed and laid, they can act as a buffer support for the innermost cable core. When the cable is subjected to external pressure, the pressure on the outer layer of the cable will be transmitted to the cable core through the honeycomb plate, thereby effectively reducing the external pressure on the cable core and providing good pressure protection for the cable core.

[0023] 3. During use, when the two splicing blocks on both sides are clamped and fixed to the hollow tube, the rotating rod is positioned inside the locking holes on both sides. The ball bearings provide support for both ends of the rotating rod, allowing it to rotate freely. By evenly installing freely rotating rods and collars around the outside of the cable, when rats gnaw on the cable, the collars will rotate, preventing the rats from gnawing on the cable. This effectively prevents rats from gnawing on the cable and provides good protection. Attached Figure Description

[0024] Figure 1 This is a perspective view of a medium-voltage fireproof cable according to the present invention;

[0025] Figure 2 This is a schematic diagram of the outer sheath structure of a medium-voltage fireproof cable according to the present invention;

[0026] Figure 3 for Figure 2 Enlarged view of the structure at point A in the image;

[0027] Figure 4 This is a schematic diagram of a honeycomb panel structure for a medium-voltage fireproof cable according to the present invention;

[0028] Figure 5 This is a schematic diagram of the fireproof component structure of a medium-voltage fireproof cable according to the present invention;

[0029] Figure 6 This is a schematic diagram of the collar structure of a medium-voltage fireproof cable according to the present invention;

[0030] Figure 7This is a schematic diagram of the fixing component structure of a medium-voltage fireproof cable according to the present invention;

[0031] Figure 8 This is a schematic diagram of the fixing component structure of a medium-voltage fireproof cable according to the present invention.

[0032] In the picture:

[0033] 1. Outer sheath; 2. Cable assembly; 201. First rubber pad; 202. First support piece; 203. Honeycomb panel; 204. Second support piece; 205. Second rubber pad; 206. Wear-resistant layer; 207. Insulation layer; 208. Inner core; 209. Filling layer; 210. Flame-retardant layer; 211. Shielding layer; 212. Cable core; 3. Fireproof assembly; 301. Fixing sleeve; 302. Groove; 303. Thin film layer; 304. Hollow tube; 305. Support ring; 306. Vent hole; 307. Air supply pipe; 308. Sealing cap; 4. Fixing assembly; 401. Splicing block; 402. Splicing hole; 403. Positioning ring; 404. Positioning groove; 405. First connecting block; 406. Second connecting block; 407. Slot; 408. Support shaft; 409. Rotating block; 410. Screw; 411. Nut; 412. Locking hole; 413. Ball bearing; 5. Rotating rod; 6. Collar. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Reference Figures 1-8As shown: A medium-voltage fireproof cable includes an outer sheath 1 and multiple rotating rods 5; a cable assembly 2, which is fixedly connected to the inner surface of the outer sheath 1. The cable assembly 2 includes multiple first rubber pads 201, each of which has a first support plate 202 fixedly connected to its outer surface. Each of the first support plates 202 has a honeycomb plate 203 fixedly connected to its outer surface. Each of the honeycomb plates 203 has a second support plate 204 fixedly connected to its outer surface. Each of the second support plates 204 has a second rubber pad 205 fixedly connected to its outer surface. A wear-resistant layer 206 is fixedly connected between the outer surfaces of the second rubber pads 205. A filling layer 209 is provided on the inner surface of the wear-resistant layer 206. An inner core 208 is fixedly connected to the inner surface of the filling layer 209. Multiple flame-retardant layers 210 are uniformly fixedly connected to the inner surface of the filling layer 209. A shielding layer 211 is fixedly connected to the inner surface of each of the multiple flame-retardant layers 210. A cable core 212 is fixedly connected to the inner surface of each of the multiple shielding layers 211. A fireproof component 3 is sleeved on the outer surface of the outer sheath 1. The fireproof component 3 includes a fixing sleeve 301 and a thin film layer 30. 3. A hollow tube 304 is fixedly connected to the outer surface of the thin film layer 303; two fixing components 4 are symmetrically fixedly connected to the outer surface of the hollow tube 304. The fixing components 4 include two splicing blocks 401. When the cable is connected and installed, the cooperation between the first support plate 202 and the second support plate 204 provides support for the honeycomb panels 203 on both sides, so that the honeycomb panels 203 are firmly fixed between the first rubber pad 201 and the second rubber pad 205. At this time, the first rubber pad 201 is used to fix the honeycomb panels 203 between the first rubber pad 201 and the second rubber pad 205. 1. The first support plate 202, honeycomb plate 203, second support plate 204, and second rubber pad 205 provide overhead support for the cable between the outer sheath 1 and the insulation layer 207. After the cable is installed and laid, they can act as a buffer support for the innermost cable core 212. When the cable is subjected to external pressure, the pressure on the outer layer of the cable will be transmitted to the cable core 212 through the honeycomb plate 203, thereby effectively reducing the external pressure on the cable core 212 and providing good pressure protection for the cable core 212.

[0036] like Figure 2 and Figure 3As shown, the outer surface of the first rubber pad 201 near the outer sheath 1 is arc-shaped, and the outer surface of the second rubber pad 205 near the insulation layer 207 is arc-shaped. The inner core 208 is located inside the cable core 212 and at the center of the filling layer 209. The thickness of the honeycomb panel 203 is greater than the thickness of the first rubber pad 201 and the second rubber pad 205, and the thickness of the first rubber pad 201 and the second rubber pad 205 is greater than the thickness of the first support piece 202 and the second support piece 204. The first rubber pad 201 and the second rubber pad 205 cooperate to provide support for the honeycomb panel 203. The first rubber pad 201 and the second rubber pad 205 are relatively soft, and when the honeycomb panel 203 is compressed, the pressure can be buffered by the compression deformation of the first rubber pad 201 and the second rubber pad 205, thereby improving the compressive strength of the honeycomb panel 203.

[0037] like Figure 5 As shown, the hollow tube 304 is located inside the groove 302. The inner surface of the thin film layer 303 is attached to the inner surface of the groove 302. An air supply pipe 307 is fixedly connected to the outer surface of the hollow tube 304. The air supply pipe 307 is connected to the hollow tube 304. A sealing cap 308 is threaded to the outer surface of the air supply pipe 307. Twisting the cap 308 will open it and detach it from the air supply pipe 307. After the sealing cap 308 is removed, nitrogen or carbon dioxide or other inert gases can be injected into the hollow tube 304 through the air supply pipe 307. After the air supply pipe 304 is filled, the hollow tube 304 in its hollow state becomes the outermost support of the cable, providing heat insulation for the inner cable.

[0038] like Figure 5 As shown, multiple support rings 305 are fixedly connected at equal intervals on the inner surface of the hollow tube 304. The outer surface of the support rings 305 is in contact with the inner surface of the hollow tube 304. Multiple ventilation holes 306 are evenly opened on the outer surface of the support rings 305. The support rings 305 provide support for the inner wall of the hollow tube 304, improving the compressive strength of the hollow tube 304. The ventilation holes 306 allow the spaces between the multiple support rings 305 to be connected, allowing inert gas to flow freely after it is filled into the hollow tube 304. The hollow tube 304 is made of polyethylene plastic with a low melting point. When the cable is short-circuited at high temperature, the high-temperature contact points of the hollow tube 304 will melt. After the hollow tube 304 melts and breaks, the inert gas filled inside the air tube 304 will be ejected from the broken point, which can play a flame-retardant role and provide good fire resistance for the cable.

[0039] like Figure 6 and Figure 7As shown, a first connecting block 405 is symmetrically fixedly connected to the outer surface of one splicing block 401, and a second connecting block 406 is symmetrically fixedly connected to the outer surface of the other splicing block 401. Splicing holes 402 are symmetrically opened on the outer surface of the splicing block 401. When splicing and installing multiple splicing blocks 401, the two parallel splicing blocks 401 can be locked and fixed by bolts through the splicing holes 402.

[0040] like Figure 6 and Figure 7 As shown, a positioning ring 403 is symmetrically fixedly connected to one outer surface of the splicing block 401. The positioning ring 403 is located outside the splicing hole 402. A positioning groove 404 is symmetrically opened on the other outer surface of the splicing block 401. The positioning groove 404 is located outside the splicing hole 402. The outer surface of the positioning ring 403 is inserted into the inner surface of the positioning groove 404. When splicing and fixing adjacent splicing blocks 401, after aligning the positioning ring 403 and the positioning groove 404 on the adjacent side, the positioning ring 403 can be inserted into the positioning groove 404, so that the splicing blocks 401 on both sides can be spliced. The cooperation between the positioning ring 403 and the positioning groove 404 plays an auxiliary positioning role, so that the splicing blocks 401 on both sides can maintain a horizontal position and complete the splicing and fixing.

[0041] like Figure 7 and Figure 8 As shown, the outer surface of the first connecting block 405 has a slot, and the inner surface of the slot is rotatably connected to a support shaft 408. The outer surface of the support shaft 408 is fixedly connected to a rotating block 409, and the outer surface of the rotating block 409 is fixedly connected to a screw 410. The outer surface of the screw 410 is threaded with a nut 411. After the two splicing blocks 401 are fitted onto the outside of the hollow tube 304 to complete the connection, the inner semi-circular arc surfaces of the two splicing blocks 401 can clamp and fix the hollow tube 304. Through the setting of the support shaft 408, the rotating block 409 can drive the screw 410 to rotate freely.

[0042] like Figure 7 and Figure 8 As shown, a slot 407 is provided on the outer surface of the second connecting block 406. The screw 410 is located inside the slot 407, and the nut 411 is located on the lower side of the second connecting block 406. The cross-section of the nut 411 is larger than that of the slot 407. After rotating the screw 410 to the inner position of the slot 407, the nut 411 is screwed onto the screw 410. Tightening the nut 411 can clamp and fix the screw 410 on the lower side of the second connecting block 406, thus completing the installation and fixing of the two splicing blocks 401. The installation operation is performed by directly rotating the screw 410, without the need to remove the installation parts separately, making the installation operation more convenient and quick.

[0043] like Figure 8As shown, multiple locking holes 412 are evenly distributed on the outer surface of the splicing block 401 near the positioning groove 404. The rotating rod 5 is located between the inner surfaces of two locking holes 412. A circular groove is formed at the bottom of the locking hole 412, and a ball bearing 413 is set on the inner surface of the circular groove. A collar 6 is fitted on the outer surface of the rotating rod 5. When the two splicing blocks 401 on both sides are clamped and fixed with the hollow tube 304, the rotating rod 5 is inserted into the inner side of the locking holes 412 on both sides to fix the position of the splicing block 401. At this time, the rotating rod 5 is located inside the locking holes 412 on both sides. The ball bearing 413 can provide support for both ends of the rotating rod 5, and the rotating rod 5 can rotate freely. By evenly installing the freely rotating rotating rod 5 and collar 6 around the outside of the cable, when a rat bites the cable, the rat lies on the surface of the cable, and the collar 6 will rotate, preventing the rat from lying on the cable to bite. This achieves the purpose of preventing the cable from being bitten by rats and provides good protection.

[0044] In this invention, during cable connection and installation, the first rubber pad 201, the first support piece 202, the honeycomb plate 203, the second support piece 204, and the second rubber pad 205 provide overhead support for the cable between the outer sheath 1 and the insulation layer 207. After the cable installation and laying are completed, they can provide buffer support for the innermost cable core 212. When the cable is subjected to external pressure, the pressure on the outer layer of the cable is transmitted to the cable core 212 through the honeycomb plate 203, thereby effectively reducing the external pressure on the cable core 212 and providing good pressure resistance protection for the cable core 212. The arrangement of the first rubber pad 201 and the second rubber pad 205 to provide support for the honeycomb plate 203 allows the honeycomb plate 203 to be supported when under pressure. The first rubber pad 201 and the second rubber pad 205 buffer the pressure under pressure deformation, improving the compressive strength of the honeycomb panel 203. After the sealing cover 308 is removed, inert gases such as nitrogen or carbon dioxide can be injected into the hollow tube 304 through the air inlet pipe 307. After the air pipe 304 is fully inflated, the hollow tube 304 acts as the outermost support for the cable, providing heat insulation for the inner cable. When there is a short circuit and high temperature inside the cable, the high-temperature contact point of the hollow tube 304 will melt. After the hollow tube 304 melts and breaks, the inert gas filled inside the air pipe 304 will be ejected from the broken point, which can play a flame-retardant role and provide better fire resistance for the cable. Through the splicing hole 402, two parallel splicing blocks 4 can be connected with bolts. 01. Locking and fixing: When splicing and fixing adjacent splicing blocks 401, after aligning the positioning ring 403 and positioning groove 404 on the adjacent side, the positioning ring 403 can be inserted into the positioning groove 404, so that the splicing blocks 401 on both sides are spliced. The cooperation between the positioning ring 403 and the positioning groove 404 plays an auxiliary positioning role, so that the splicing blocks 401 on both sides can maintain a horizontal position to complete the splicing and fixing. The inner semi-circular arc surface of the two splicing blocks 401 can clamp and fix the hollow tube 304. Through the setting of the support shaft 408, the rotating block 409 can drive the screw 410 to rotate freely. After rotating the screw 410 to the inner position of the slot 407, the nut 411 is screwed on the screw 410. Tightening the nut 411 can fix the screw 410. The clamp 401 is fixed to the lower side of the second connecting block 406, completing the installation and fixation of the two splicing blocks 401. The installation operation is performed by directly rotating the screw 410, eliminating the need to remove installation parts separately, making the installation operation convenient and quick. When the two splicing blocks 401 on both sides are clamped and fixed to the hollow tube 304, the rotating rod 5 is positioned inside the two side locking holes 412. The ball bearings 413 provide support for both ends of the rotating rod 5, allowing it to rotate freely. By evenly installing the freely rotating rod 5 and collar 6 around the outside of the cable, when a mouse gnaws on the cable, the collar 6 will rotate, preventing the mouse from gnawing on the cable.It effectively prevents rodents from gnawing on the cables, providing good protection.

[0045] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A medium-voltage fire-resistant cable, characterized in that: It includes an outer skin (1) and multiple rotating rods (5); A cable assembly (2) is fixedly connected to the inner surface of the outer sheath (1). The cable assembly (2) includes a plurality of first rubber pads (201), each of which has a first support plate (202) fixedly connected to its outer surface. A honeycomb plate (203) is fixedly connected to the outer surface of each of the first support plates (202), and a second support plate (204) is fixedly connected to the outer surface of each of the honeycomb plates (203). A second rubber pad (204) is fixedly connected to the outer surface of each of the second support plates (204). A pad (205) is provided with a wear-resistant layer (206) fixedly connected between the outer surfaces of multiple second rubber pads (205). A filling layer (209) is provided on the inner surface of the wear-resistant layer (206). An inner core (208) is fixedly connected to the inner surface of the filling layer (209). Multiple flame-retardant layers (210) are uniformly fixedly connected to the inner surface of the filling layer (209). A shielding layer (211) is fixedly connected to the inner surface of each of the multiple flame-retardant layers (210). A cable core (212) is fixedly connected to the inner surface of each of the multiple shielding layers (211). Fireproof component (3), the fireproof component (3) is sleeved on the outer surface of the outer skin (1), the fireproof component (3) includes a fixing sleeve (301) thin film layer (303), and a hollow tube (304) is fixedly connected to the outer surface of the thin film layer (303). Fixing component (4), the number of fixing components (4) is set to two, the two fixing components (4) are symmetrically fixedly connected to the outer surface of the hollow tube (304), the fixing component (4) includes two splicing blocks (401). The hollow tube (304) is located inside the groove (302), the inner surface of the thin film layer (303) is in contact with the inner surface of the groove (302), and an air supply pipe (307) is fixedly connected to the outer surface of the hollow tube (304). The air supply pipe (307) is connected to the hollow tube (304) in a communicating manner, and a sealing cap (308) is threadedly connected to the outer surface of the air supply pipe (307). Multiple support rings (305) are fixedly connected at equal intervals on the inner surface of the hollow tube (304). The outer surface of the support rings (305) is in contact with the inner surface of the hollow tube (304). Multiple ventilation holes (306) are uniformly opened on the outer surface of the support rings (305). A positioning ring (403) is symmetrically fixedly connected to one side of the outer surface of the splicing block (401). The positioning ring (403) is located outside the splicing hole (402). A positioning groove (404) is symmetrically opened on the other side of the outer surface of the splicing block (401). The positioning groove (404) is located outside the splicing hole (402). The outer surface of the positioning ring (403) is inserted into the inner surface of the positioning groove (404). The splicing block (401) has a plurality of slots (412) evenly opened on the outer surface of the side near the positioning groove (404). The rotating rod (5) is located between the inner surfaces of two slots (412). A circular groove is opened at the bottom of the slot (412). A ball (413) is provided on the inner surface of the circular groove. A collar (6) is sleeved on the outer surface of the rotating rod (5).

2. The medium-voltage fire-resistant cable according to claim 1, characterized in that: The outer surface of the first rubber pad (201) near the outer sheath (1) is arc-shaped, and the outer surface of the second rubber pad (205) near the insulation layer (207) is arc-shaped. The inner core (208) is located inside the cable core (212). The inner core (208) is located at the center of the filling layer (209). The thickness of the honeycomb plate (203) is greater than the thickness of the first rubber pad (201) and the second rubber pad (205). The thickness of the first rubber pad (201) and the second rubber pad (205) is greater than the thickness of the first support plate (202) and the second support plate (204).

3. The medium-voltage fire-resistant cable according to claim 2, characterized in that: One of the splicing blocks (401) has a first connecting block (405) symmetrically fixedly connected to its outer surface, and the other splicing block (401) has a second connecting block (406) symmetrically fixedly connected to its outer surface. The splicing blocks (401) have splicing holes (402) symmetrically opened on their outer surfaces.

4. The medium-voltage fire-resistant cable according to claim 3, characterized in that: The outer surface of the first connecting block (405) has a slot, the inner surface of the slot is rotatably connected to a support shaft (408), the outer surface of the support shaft (408) is fixedly connected to a rotating block (409), the outer surface of the rotating block (409) is fixedly connected to a screw (410), and the outer surface of the screw (410) is threadedly connected to a nut (411).

5. The medium-voltage fire-resistant cable according to claim 4, characterized in that: The outer surface of the second connecting block (406) is provided with a slot (407), the screw (410) is located inside the slot (407), the nut (411) is located below the second connecting block (406), and the cross-section of the nut (411) is larger than the cross-section of the slot (407).

6. A method for connecting medium-voltage fire-resistant cables, characterized in that, The use of a medium-voltage fire-resistant cable as described in claim 5 includes the following steps: S1. When the cable is connected and installed, the first rubber pad (201), the first support plate (202), the honeycomb plate (203), the second support plate (204), and the second rubber pad (205) provide overhead support for the cable between the outer sheath (1) and the insulation layer (207). When the cable is subjected to external pressure, the pressure on the outer layer of the cable will be transmitted to the cable core (212) through the honeycomb plate (203), thereby effectively reducing the external pressure on the cable core (212) and playing a good anti-compression protection role for the cable core (212). S2. After the sealing cap (308) is removed, nitrogen or carbon dioxide inert gas is injected into the hollow tube (304) through the gas filling pipe (307). After the hollow tube (304) is filled with gas, the hollow tube (304) in the hollow state becomes the outermost support of the cable and plays a heat insulation role for the inner cable. When the cable is short-circuited at high temperature, the high temperature contact point of the hollow tube (304) will melt. After the hollow tube (304) melts and breaks, the inert gas filled inside the hollow tube (304) will be sprayed out from the broken part, which plays a flame-retardant role and provides better fire resistance for the cable. S3. After rotating the screw (410) to the inner position of the slot (407), screw the nut (411) onto the screw (410). Tighten the nut (411) to clamp and fix the screw (410) to the lower position of the second connecting block (406), thus completing the installation and fixing of the two splicing blocks (401). The installation operation is performed by directly rotating the screw (410), without the need to take out the installation parts separately, making the installation operation more convenient and quick. S4. By uniformly installing a rotating rod (5) and a collar (6) around the outside of the cable, when a rat bites the cable, the rat lies on the surface of the cable and the collar (6) will rotate, preventing the rat from lying on the cable to bite. This achieves the purpose of preventing the cable from being bitten by rats and provides good protection.

Images