High-voltage cable intermediate joint fireproof early warning device convenient to maintain

Abstract

The invention provides a high-voltage cable intermediate joint fireproof early warning device convenient to maintain, which comprises an inner shell and an outer shell which are symmetrical and split, the outer shell is sleeved outside the inner shell, an inner sealing cavity penetrating to the outside is symmetrically arranged in the inner shell, the inner sealing cavity is used for installing a wrapped joint, and the inner sealing cavity is used for sealing the wrapped joint. And heat conduction structures are symmetrically arranged on the inner shell. According to the cable connector, when the cable connector generates heat, the heat is dissipated out through the contact heat conduction structure, so that the temperature of the connector is reduced, when the temperature continuously rises, cooling liquid in the gas storage bottle is sprayed out from one end of the upper shell to cool the upper shell, and gas in the gas storage bottle also has the fire extinguishing capacity; when a line is on fire due to overload or aging, the gas storage cylinder can extinguish the generated flame, so that the installability of the line is improved, the probability of fire disasters is reduced, and meanwhile, an early warning effect is achieved, and the situation of cable fire disasters is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage cable joint equipment, in particular to a fire prevention and early warning device for a high-voltage cable intermediate joint which is easy to maintain. Background Art

[0002] High-voltage transmission lines refer to transmission lines that transmit higher voltages. Usually, we call transmission lines with voltages above 10kV high-voltage transmission lines. Since the power grid requires more power supply links and longer transmission lines, the intermediate joints of power cables have become an indispensable part of the urban power grid, which are used to connect two sections of cables and improve the electric field at the ends of the two cables. The intermediate joints of cables are the weakest link in the power cable lines of the power grid. Except for force damage, 90% of transmission cable failures are caused by the explosion of cable joints. Once the cable joints explode and burn, adjacent cables may be damaged, and even cable group injuries and fire accidents may occur, which may cause high-risk power grid accidents such as decompression of the entire station. With the rapid development of cities, underground transmission cables have become the aorta of urban power grids. Due to the shortage of underground resources, multiple cable lines are generally laid in the same cable trench. Therefore, fire prevention and control of cable trench sections is the focus of the operation and maintenance of transmission cable lines. Most of the cable joints are run in cable trenches or cable wells. Cable trenches are often poorly ventilated and the environment is relatively humid. Cable joints may be soaked in water, get damp, or have air ingress. This may cause cable joints to break down and spontaneously combust. In more serious cases, other cables may be damaged or even burned after the explosion. To prevent cable joints from getting damp, sealed explosion-proof boxes are often used to protect the joints to reduce the probability of dampness, air ingress, and accidents, and to minimize losses when accidents occur.

[0003] The cable joints currently laid in cable tunnels and cable trenches usually have the following problems:

[0004] 1. The joint explosion-proof box currently used is usually composed of two double-layer semi-cylinders that cannot burn, and the interlayer of the two shells is filled with fire-proof and shock-absorbing solid flame-retardant fillers. Although the sealed explosion-proof box protects the cable joints and increases the fireproof and shock-absorbing capabilities of the cable joints, the cable joints will generate heat due to loose welding or long-term overload of the cable. Due to the poor thermal conductivity of the filled solid flame-retardant material, it is easy to cause the temperature in the box to rise, increasing the risk of fire.

[0005] 2. Some companies will set up different layers of brackets in the cable trench to fix the cables and connectors on the wall and separate the cables and connectors from the humid air at the bottom. Multiple cables and connectors will be placed closely on a layer of brackets. However, dense cables and connectors are not conducive to heat dissipation. When a cable and connector generates heat, the heat will be transferred to the adjacent cables and connectors, causing other cables and connectors to generate heat, which is easy to cause heat accumulation and is not conducive to the safe operation of the cables.

[0006] A Chinese patent with authorization announcement number CN108599088A discloses a cable joint protection device, including a shell, which is a cylindrical structure. Both ends of the cylindrical structure are sealed with the cable, and the cable joint is arranged inside the shell. The disadvantage of this device is that although it can only reduce the damage caused by explosion at the cable joint, the joint will generate heat due to loose welding or overload, and it cannot effectively cool the joint. At the same time, the sealing structure prevents the heat from being dissipated, resulting in rapid accumulation of heat, which will aggravate the heating situation and increase the probability of fire at the contact head. Summary of the invention

[0007] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a high-voltage cable intermediate joint fire warning device that is easy to maintain to solve the problems raised in the above background technology.

[0008] The technical solution is that the present invention comprises two symmetrically split inner and outer shells, the outer shell is sleeved outside the inner shell, the inner shell is symmetrically provided with an inner sealed cavity penetrating to the outside, the inner sealed cavity is used to install the wrapped joint, and the inner shell is symmetrically provided with a heat conducting structure;

[0009] The heat conduction mechanism comprises a fixed plate and a contact plate located in the sealed cavity, the fixed plate is fixedly connected to the inner shell, the top of the fixed plate is fixedly connected to a liquid storage tank, the interior of the fixed plate is slidably connected to a hollow moving column, the interior of the liquid storage tank and the moving column are filled with heat conduction liquid, the bottom end of the moving column is fixedly connected to the contact plate, a spring hose is fixedly connected between the fixed plate and the contact plate, and the spring hose is sleeved on the outside of the spring hose;

[0010] The outer shell comprises an upper shell and a lower shell, wherein a notch groove is provided at one end of the outer wall of the upper shell, a ring sleeve is fixedly connected to the side wall of the open groove, one end of the ring sleeve is fixedly connected to the upper shell, a connecting hole is provided inside the ring sleeve, one end of the connecting hole is threadedly connected to a gas cylinder, and the gas cylinder stores perfluorohexanone gas or nitrogen, a conical cavity with a cone head facing outward is provided at the bottle mouth of the gas cylinder, a ball is slidably connected in the conical cavity up and down, a ventilation ring plate is fixedly connected to the middle part of the connecting hole, a Y-shaped air duct connecting the two ends is provided inside the ventilation ring plate, a top pipe extending into the conical cavity is fixedly connected at one end of the ventilation ring plate, a convex surface is provided at the other end of the ventilation ring plate, an inner wall of one end of the connecting hole is slidably connected to a rotating ring, a sliding groove is provided on the outer wall of the rotating ring, a fixed bead is slidably connected in the sliding groove, the fixed bead is fixedly connected in the connecting hole, and a concave surface corresponding to the convex surface is provided at one end of the rotating ring;

[0011] A temperature control component is installed at one end of the sleeve ring, and the temperature control component includes a driven wheel and a Bourdon tube. One end of the driven wheel is fixedly connected to a rod frame, one end of the connecting hole is fixedly connected to a sealing cover plate, the rod frame is rotatably connected to the sealing cover plate, one end of the rotating ring is provided with a spline portion, one end of the rod frame is provided with a spline groove slidably connected to the spline portion, the interior of the driven wheel is fixedly connected to a nozzle, and the rotating ring and the rod frame are provided with an air flow channel connected to the nozzle.

[0012] Furthermore, one end of the Bourdon tube is fixedly connected to the ring sleeve, the other end of the Bourdon tube is rotatably connected to a connecting rod, one end of the connecting rod is rotatably connected to a fan-shaped gear, the middle part of the fan-shaped gear is rotatably connected to a fixed rod, the fixed rod is fixedly connected to the ring sleeve, the fan gear is transmission-connected to a driven wheel, and the Bourdon tube is filled with alcohol.

[0013] Furthermore, the outer wall of the liquid storage tank is fixedly connected to a heat sink, and a plurality of heat sink fins are fixedly connected to the heat sink. The symmetrical inner shell is fixed by bolts, and a filling hole is opened at the top of one of the inner shells, and a cap is threadedly connected to the top of the filling hole.

[0014] Furthermore, an arc frame is fixedly connected to the inner wall of the outer shell, one end of the arc frame is fixedly connected to a rubber strip that is fitted with the inner shell, the arc frame supports and fixes the inner shell through the rubber strip, the upper shell and the lower shell are fixedly connected by bolts, one end of the upper shell away from the opening groove is fixedly connected to a one-way air valve, and stabilizing grooves are provided at both ends of the lower shell.

[0015] Furthermore, both ends of the inner shell and the outer shell are provided with a blocking cavity filled with fireproof mud, and both ends of the inner shell and the outer shell are fixedly connected with a wrapping layer, which is formed by winding multiple layers of sealing tape and waterproof tape.

[0016] Furthermore, a mounting frame is provided on the outside of the outer shell, one side of the mounting frame is fixedly connected to a support rod, the outer shell is fixed to the support rod through a stabilizing groove, a bottom plate is provided at the bottom end of the support rod, and plug-in grooves are provided inside the bottom plate and the support rod, and a partition plate is plugged into the plug-in groove.

[0017] Furthermore, the two sides of the partition plate are symmetrically fixedly connected with a curved rubber frame and a square frame, the square frame is located at the top of the curved rubber frame, one side of the curved rubber frame is provided with a curved surface, and the partition plate supports the side of the outer shell through the square frame.

[0018] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0019] 1. After the inner shell wraps the cable joint, add flame retardant liquid into the inner sealing cavity to isolate the cable joint from the outside air and prevent it from being affected by the outside humid air. When the cable joint generates heat, the heat is dissipated through the contact heat-conducting structure, thereby reducing the temperature at the joint. When the temperature between the inner shell and the outer shell continues to rise, the temperature control component is activated to form a channel between the rotating ring and the ventilation ring plate. At this time, the cooling liquid in the gas cylinder is sprayed out from one end of the upper shell to cool the inner shell and the outer shell. At the same time, the gas in the gas cylinder also has fire extinguishing ability. When the line catches fire due to overload or aging, the nitrogen or perfluorohexanone gas sprayed from the gas cylinder can extinguish the flame, which increases the installability of the line and reduces the chance of fire.

[0020] 2. When the gas inside the gas cylinder is used up, the material can be replaced by replacing the gas cylinder. At the same time, when the gas cylinder is consumed too quickly, it means that heat is often generated at the joint, reminding the maintenance personnel that there is a problem at the cable joint and it needs to be checked and replaced. It has an early warning effect on the maintenance personnel and reduces the occurrence of fire.

[0021] 3. By setting support rods and bottom plates on the mounting frame, the joints can be separated from the wet ground at the bottom of the cable trench, reducing the impact of ground liquid on the lines. At the same time, the plug-in slots on the support rods can be equipped with multiple partitions to separate multiple cables from the outer shell, preventing heat from being transferred to other lines and joints when a certain line generates heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0023] Figure 2 It is a three-dimensional schematic diagram of the connection structure between the inner shell and the heat conducting structure in the present invention.

[0024] Figure 3 It is a three-dimensional cross-sectional schematic diagram of the connection structure between the inner shell and the heat-conducting structure in the present invention.

[0025] Figure 4 It is a three-dimensional cross-sectional schematic diagram of the heat-conducting structure in the present invention.

[0026] Figure 5 It is a three-dimensional schematic diagram of the connection structure between the ring sleeve and the gas storage bottle in the present invention.

[0027] Figure 6 It is a three-dimensional cross-sectional schematic diagram of the connection structure between the ring sleeve and the gas storage bottle in the present invention.

[0028] Figure 7 It is a three-dimensional cross-sectional schematic diagram of the ring sleeve in the present invention.

[0029] Figure 8 It is a three-dimensional schematic diagram of the connection structure between the rotating ring and the rod frame in the present invention.

[0030] Fig. 9 It is a three-dimensional schematic diagram of the connection structure between the ventilation ring plate and the top pipe in the present invention.

[0031] Fig.10 It is a three-dimensional schematic diagram of the rotating ring in the present invention.

[0032] Fig.11 It is a three-dimensional cross-sectional schematic diagram of the rotating ring in the present invention.

[0033] Fig.12 It is a three-dimensional schematic diagram of the rod frame in the present invention.

[0034] Fig.13 It is a three-dimensional schematic diagram of the connection structure between the upper shell and the lower shell in the present invention.

[0035] Fig.14 It is a partial three-dimensional cross-sectional schematic diagram of the connection structure between the upper shell and the lower shell in the present invention.

[0036] Fig.15 It is a partial three-dimensional cross-sectional schematic diagram of the connection structure between the inner shell and the outer shell in the present invention.

[0037] Fig.16 It is a three-dimensional schematic diagram of the connection structure between the mounting frame and the support rod in the present invention.

[0038] Fig.17It is a three-dimensional schematic diagram of the connection structure between the partition plate and the curved rubber frame in the present invention.

[0039] Explanation of the symbols in the schematic diagram:

[0040] 101, inner shell; 102, outer shell; 103, inner sealing cavity; 104, heat-conducting structure; 105, fixed plate; 106, contact plate; 107, liquid storage tank; 108, moving column; 109, spring hose; 110, upper shell; 111, lower shell; 112, cutout groove; 113, ring sleeve; 114, connecting hole; 115, gas storage bottle; 116, conical cavity; 117, ball bearing; 118, ventilation ring plate; 119, Y-shaped air duct; 120, top pipe; 121, convex surface; 122, rotating ring; 123, sliding groove; 124, fixed bead; 125, concave surface; 126, temperature control component; 127, driven wheel; 128. Bourdon tube; 129. Rod frame; 130. Sealing cover plate; 131. Spline portion; 132. Spline groove; 133. Nozzle; 134. Linking rod; 135. Fan gear; 136. Fixing rod; 137. Heat sink; 138. Heat sink fin; 139. Feeding hole; 140. Cover cap; 141. Arc frame; 142. Rubber strip; 143. One-way air valve; 144. Stabilizing groove; 145. Sealing cavity; 146. Fireproof mud; 147. Wrapping layer; 148. Mounting frame; 149. Support rod; 150. Bottom plate; 151. Plug-in groove; 152. Partition plate; 153. Arc rubber frame; 154. Square frame. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0042] Depend on Figures 1 to 11It is given, including two symmetrical split inner shells 101 and outer shells 102, the outer shell 102 is sleeved outside the inner shell 101, and the outer shell 102 wraps the inner shell 101 inside to play a protective role. At the same time, the inner shell 101 and the outer shell 102 form a space for heat dissipation by the heat dissipation fins 138. The interior of the symmetrical inner shell 101 is provided with an inner sealed cavity 103 that penetrates to the outside. After the two sections of the inner shell 101 are connected, the cable joint is located in the inner sealed cavity 103, and it can be fixed by closely adhering to the heat conductive structure 104. At the same time, the inner sealed cavity 103 is filled with flame retardant liquid, which can play a role of flame retardancy and shock absorption, and prevent the outside air from affecting the joint. The inner sealed cavity 103 is used to install the wrapped joint, and the inner shell 101 is symmetrically provided with a heat conductive structure 104. Through the heat conductive structure 104 that is in contact with the cable joint, the heat generated at the joint can be dissipated to cool the joint;

[0043] refer to Figure 3 and Figure 4 The heat transfer mechanism includes a fixed plate 105 and a contact plate 106 located in the sealed cavity. The contact plate 106 is fitted with the joint, and the heat is transferred to the heat dissipation fins 138 through the moving column 108 at the top and the heat-conducting liquid in the liquid storage tank 107, thereby completing the heat transfer. The fixed plate 105 is fixedly connected to the inner shell 101, and the top of the fixed plate 105 is fixedly connected to the liquid storage tank 107. The inside of the fixed plate 105 is slidably connected to the hollow moving column 108. The inside of the liquid storage tank 107 and the moving column 108 are filled with heat-conducting liquid. The heat-conducting liquid can be perfluorohexanone gas or fluorinated hydrocarbon substances. The moving column 108 The bottom end is fixedly connected to the contact plate 106, and a spring hose 109 is fixedly connected between the fixed plate 105 and the contact plate 106. The spring hose 109 is composed of a telescopic tube and a coil spring. The coil spring is located in the telescopic tube and connected between the contact plate 106 and the fixed plate 105. It has ductility and sealing properties, and can increase the sealing property inside the inner sealing cavity 103. When the diameter of the cable joint is too large, the moving column 108 is pressed into the liquid storage tank 107, and the contact plate 106 at the bottom will always fit with the joint, which can adapt to joints of different diameters. The spring hose 109 is sleeved on the outside of the spring hose 109;

[0044] refer to Figure 5 and Fig.14The outer shell 102 includes an upper shell 110 and a lower shell 111. A notch 112 is provided at one end of the outer wall of the upper shell 110. A notch 112 is provided at one end of the upper shell 110 for installing and replacing a gas cylinder 115. After the fire extinguishing and cooling liquid in the gas cylinder 115 is used up, the material can be replaced by replacing the gas cylinder 115, which is convenient for maintenance. Stabilizing grooves 144 are provided at both ends of the lower shell 111 for fixing the outer shell 102 on the support rod 149 so that it will not move axially. A ring sleeve 113 is fixedly connected to the side wall of the opening groove. The ring sleeve 113 connects the inside and the outside of the upper shell 110. The temperature control component 126 is fixed at one end and the other end Used for replacing the gas cylinder 115, one end of the ring sleeve 113 is fixedly connected to the upper shell 110, a connecting hole 114 is provided inside the ring sleeve 113, one end of the connecting hole 114 is threadedly connected to the gas cylinder 115, and the gas cylinder 115 stores perfluorohexanone gas or nitrogen. The ejected perfluorohexanone gas or nitrogen can cool the hot air between the inner shell 101 and the outer shell 102, and also has the ability to extinguish fire. The ejected gas takes away the heat of the heat dissipation fins 138 and is discharged from the one-way gas valve 143 at one end of the upper shell 110. A conical cavity 116 with a cone head facing outward is provided at the bottle mouth of the gas cylinder 115, and a ball 117 is connected to the conical cavity 116 to slide up and down. The ball 117 is located in the conical cavity 116 and is pushed by the gas inside the gas bottle 115 to be blocked at the cone head of the conical cavity 116, thereby sealing the gas inside the gas bottle 115. After the gas bottle 115 is installed on the ring sleeve 113, the top pipe 120 on the ventilation ring plate 118 will push the ball 117 open, so that the gas in the gas bottle 115 can flow out. The middle part of the connecting hole 114 is fixedly connected with the ventilation ring plate 118, and the interior of the ventilation ring plate 118 is provided with a Y-shaped air duct 119 connecting the two ends. When the ventilation ring plate 118 and the rotating ring 122 are tightly attached together, the cooling gas ejected from the gas bottle 115 will be blocked in the Y-shaped air duct 119 until the ventilation ring plate 118 is opened. The ball 117 will be ejected from the gap only when it is separated from the rotating ring 122. One end of the ventilation ring plate 118 is fixedly connected with a top pipe 120 extending into the tapered cavity 116. The top pipe 120 extends into the tapered cavity 116 and is used to push the ball 117 open. The other end of the ventilation ring plate 118 is provided with a convex surface 121. The inner wall of one end of the connecting hole 114 is slidably connected to the rotating ring 122. A sliding groove 123 is provided on the outer wall of the rotating ring 122. The sliding groove 123 is slidably connected to a fixed bead 124. The fixed bead 124 is fixedly connected to the connecting hole. When the rotating ring 122 rotates, it will move axially in the connecting hole 114. One end of the rotating ring 122 is provided with a concave surface 125 corresponding to the convex surface 121.

[0045] refer to Figure 5 and Fig.12A temperature control assembly 126 is installed at one end of the sleeve ring. The temperature control assembly 126 includes a driven wheel 127 and a Bourdon tube 128. The expansion and contraction of the gas in the Bourdon tube 128 drives the driven wheel 127 to rotate. One end of the driven wheel 127 is fixedly connected to a rod frame 129. The driven wheel 127 is fixed to a sealing cover plate 130 through the rod frame 129. One end of the connecting hole 114 is fixedly connected to the sealing cover plate 130. The rod frame 129 is rotatably connected to the sealing cover plate 130. A spline portion 131 is provided at one end of the movable ring 122. When the rod frame 129 rotates, the spline portion 131 is driven to rotate together. The spline portion 131 slides in the spline groove 132, so that the rotating ring 122 moves axially. A spline groove 132 is provided at one end of the rod frame 129 and is slidably connected to the spline portion 131. A nozzle 133 is fixedly connected to the inside of the driven wheel 127. An air flow channel connected to the nozzle 133 is provided inside the rotating ring 122 and the rod frame 129.

[0046] Specifically, refer to Figure 5 and Figure 8 One end of the Bourdon tube 128 is fixedly connected to the ring sleeve 113. When the liquid in the Bourdon tube 128 expands, the Bourdon tube 128 will be deformed, and the sector gear 135 is driven to rotate through the connecting rod 134, and the sector gear 135 drives the driven wheel 127 to rotate. The other end of the Bourdon tube 128 is rotatably connected to the connecting rod 134, and one end of the connecting rod 134 is rotatably connected to the sector gear 135. The middle part of the sector gear 135 is rotatably connected to the fixing rod 136, and the fixing rod 136 is fixedly connected to the ring sleeve 113. The sector gear 135 is transmission-connected to the driven wheel 127. The Bourdon tube 128 is filled with alcohol, and can also be filled with other liquids with a large expansion coefficient, such as kerosene, mercury, etc.

[0047] Specifically, refer to Figure 2 and Figure 3 The outer wall of the liquid storage tank 107 is fixedly connected to a heat sink 137, and a plurality of heat sink fins 138 are fixedly connected to the heat sink 137. The heat sink fins 138 are used to dissipate the heat of the liquid in the liquid storage tank 107. The symmetrical inner shells 101 are fixed by bolts, and a filling hole 139 is opened at the top of one of the inner shells 101. The inner shell 101 is filled with fire-retardant liquid, and a cap 140 is threadedly connected to the top of the filling hole 139.

[0048] Specifically, refer to Fig.14The inner wall of the outer shell 102 is fixedly connected with an arc frame 141, and one end of the arc frame 141 is fixedly connected with a rubber strip 142 that is closely connected to the inner shell 101. The arc frame 141 supports and fixes the inner shell 101 through the rubber strip 142. The arc frame 141 can prevent the inner shell 101 from shaking in the outer shell 102. The upper shell 110 and the lower shell 111 are fixedly connected by bolts. One end of the upper shell 110 away from the open groove is fixedly connected with a one-way air valve 143. When there is too much gas between the inner shell 101 and the outer shell 102 due to heat, the gas will be discharged from the one-way air valve 143, while preventing the external humid air from entering the outer shell 102. Stabilizing grooves 144 are provided at both ends of the lower shell 111.

[0049] Specifically, refer to Fig.13 and Fig.15 A sealing cavity 145 is provided at both ends of the inner shell 101 and the outer shell 102, and the sealing cavity 145 is filled with fireproof mud 146. By blocking the connection between the outer shell 102 and the inner shell 101 and the cable at both ends, the internal sealing is increased. The inner shell 101 and the outer shell 102 are fixedly connected at both ends with a wrapping layer 147. By winding multiple layers of sealing tape and waterproof tape, the sealing of the two ends is enhanced. The wrapping layer 147 is formed by winding multiple layers of sealing tape and waterproof tape.

[0050] Specifically, refer to Fig.16 A mounting frame 148 is provided on the outside of the outer shell 102, and a support rod 149 is fixedly connected to one side of the mounting frame 148. The mounting frame 148 and the support rod 149 can separate the cable connector from the bottom of the cable groove, reducing the impact of humid air at the bottom of the cable groove on the cable and the connector. At the same time, each cable and connector can be separated through the plug-in slot 151 to reduce the impact of the cable heating on other cables. The outer shell 102 is fixed to the support rod 149 through the stabilizing slot 144. A bottom plate 150 is provided at the bottom end of the support rod 149, and a plug-in slot 151 is provided inside the bottom plate 150 and the support rod 149, and a partition plate 152 is inserted in the plug-in slot 151.

[0051] Specifically, refer to Fig.17 The two sides of the partition plate 152 are symmetrically fixedly connected with a curved rubber frame 153 and a square frame 154. The square frame 154 is located at the top of the curved rubber frame 153. A curved surface is opened on one side of the curved rubber frame 153. The curved surface on the curved rubber frame 153 fits with the outer wall of the cable. After the two partition plates 152 wrap the cable, it is convenient to fix the cable on the support rod 149. The partition plate 152 supports the side of the outer shell 102 through the square frame 154.

[0052] When the present invention is used to install the cable joint, after the joints of the two sections of the cable are welded and wrapped, the wrapped part is placed in the inner sealed cavity 103, and the two split inner shells 101 are used to wrap it. The spring hose 109 on the heat-conducting structure 104 is extended to keep the cable joint in the center, and the contact plate 106 of the heat-conducting structure 104 fits the connection between the cable wrapping part, and the two inner shells 101 are fixed by bolts, and the fireproof mud 146 is inserted into the blocking cavity 145 on both sides of the inner shell 101 to seal the connection between the cable and the inner shell 101, and then the waterproof tape and the sealing tape are wrapped to form a wrapping layer 147 to enhance the sealing performance, and the cap 140 on the top of the inner shell 101 is opened, and the flame-retardant liquid filler is added into the inner sealed cavity 103 from the filling hole 139. After adding, the cap 140 is tightened to make the cable connection and the outer The outer shell 102 is isolated from the outer shell 101. At this time, the external water vapor, temperature, etc. will not affect the cable joint. The upper shell 110 and the lower shell 111 of the outer shell 102 are sleeved on the inner shell 101. The arc frame 141 in the upper shell 110 and the lower shell 111 supports the outer wall of the inner shell 101. The rubber strip 142 acts as a cushion. The ring sleeve 113 and the temperature control component 126 are fixed on the upper shell 110. The upper shell 110 and the lower shell 111 are fixed together by bolts. The fireproof mud 146 is inserted into the blocking cavity 145 on both sides of the outer shell 102, and the connection between the cable and the outer shell 102 is sealed. Then, the waterproof tape and the sealing tape are wrapped to form a wrapping layer 147 to enhance the sealing performance, so that the interior of the outer shell 102 is isolated from the outside world, and the gas storage bottle 115 is installed into the connecting hole 114 on the ring sleeve 113 through threads;

[0053] When the gas bottle 115 is installed into the communication hole 114, the top pipe 120 at one end of the ventilation ring plate 118 extends into the tapered cavity 116, and pushes open the ball 117 blocking the top of the tapered cavity 116, so that the inside of the gas bottle 115 is connected through the Y-shaped air duct 119. Because the concave surface 125 on the rotating ring 122 is in close contact with the convex surface 121 on the ventilation ring plate 118, the gas in the gas bottle 115 is blocked in the Y-shaped air duct 119.

[0054] When fixing, fix the support rod 149 to the inner wall of the cable trench through the mounting frame 148, insert the two partition plates 152 into the plug-in slot 151, and place the outer shell 102 between the two partition plates 152. The square frame 154 on the partition plate 152 can support the edges on both sides of the outer shell 102. At the same time, the stabilizing groove 144 at the bottom of the outer shell 102 will be stuck on the support rod 149 to enhance the stability during placement. When other cables need to be placed, the two partition plates 152 are used to clamp the cables through the curved rubber frame 153, and then the two partition plates 152 are inserted into the support rod 149 and the plug-in slot 151 on the bottom plate 150, thereby completing the fixation of the cables.

[0055] During use of the present invention, when the cable joint generates heat due to loose welding or dirty joints, the heat is transferred to the heat-conducting liquid in the movable column 108 and the liquid storage tank 107 through the contact plate 106, and the heat is transferred to the heat dissipation frame 137 through the outer wall of the liquid storage tank 107. The liquid storage tank 107 dissipates heat through the heat dissipation fins 138 on the heat dissipation frame 137, and the heat is dissipated into the space between the inner shell 101 and the outer shell 102. When the heat generation continues to increase, the temperature between the inner shell 101 and the outer shell 102 will increase. The Bourdon tube 128 is filled with alcohol with a large expansion coefficient. The Bourdon tube 128 is deformed after being heated, and the sector gear 135 is driven to rotate through the connecting rod 134. The sector gear 135 is meshed with the driven wheel 127 to rotate the driven wheel 127. The driven wheel 127 drives the rod frame 129 to rotate on the sealing cover plate 130. The rod frame 129 is driven by the spline portion 131 at one end. The rotating ring 122 rotates. When the rotating ring 122 rotates, the fixed bead 124 slides in the sliding groove 123 to move axially toward the Bourdon tube 128, so that a gap is generated between the concave surface 125 and the convex surface 121 on the rotating ring 122. At this time, the gas in the Y-shaped air duct 119 flows out from the gap between the convex surface 121 and the concave surface 125, passes through the rotating ring 122 and the air flow channel inside the rod frame 129, and is then ejected from the nozzle 133. The gas cylinder 115 stores perfluorohexanone gas or nitrogen, which can cool the hot air in the inner shell 101 and the outer shell 102. The internal gas is discharged from the one-way air valve 143 at the other end of the upper shell 110. When the interior is cooled, the Bourdon tube 128 contracts, and the driven wheel 127 is reversed through the connecting rod 134 and the fan gear 135, so that the rotating ring 122 and the ventilation ring plate 118 are attached together, blocking the outflow of gas in the Y-shaped air duct 119.

[0056] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A fire prevention warning device for a high-voltage cable intermediate joint that is easy to maintain, characterized in that: The invention comprises two symmetrically split inner shells (101) and an outer shell (102) encapsulating the cable, wherein the outer shell (102) is sleeved outside the inner shell (101), and an inner sealed cavity (103) penetrating to the outside is symmetrically provided inside the inner shell (101), and the inner sealed cavity (103) is used to install the encapsulated connector, and a heat conducting structure (104) is symmetrically provided on the inner shell (101); The heat conduction mechanism comprises a fixed plate (105) and a contact plate (106) located in the sealed cavity, the fixed plate (105) is fixedly connected to the inner shell (101), the top of the fixed plate (105) is fixedly connected to a liquid storage tank (107), the interior of the fixed plate (105) is slidably connected to a hollow moving column (108), the interior of the liquid storage tank (107) and the moving column (108) are filled with heat conduction liquid, the bottom end of the moving column (108) is fixedly connected to the contact plate (106), a spring hose (109) is fixedly connected between the fixed plate (105) and the contact plate (106), and the spring hose (109) is sleeved on the outside of the spring hose (109); The outer shell (102) comprises an upper shell (110) and a lower shell (111); a notch (112) is provided at one end of the outer wall of the upper shell (110); a ring sleeve (113) is fixedly connected to the side wall of the notch; one end of the ring sleeve (113) is fixedly connected to the upper shell (110); a connecting hole (114) is provided inside the ring sleeve (113); one end of the connecting hole (114) is threadedly connected to a gas storage bottle (115); the gas storage bottle (115) stores perfluorohexanone gas or nitrogen; a conical cavity (116) with a cone head facing outward is provided at the bottle mouth of the gas storage bottle (115); a ball (117) is slidably connected to the conical cavity (116); the connecting hole (114) is provided with a connecting hole (114); A ventilation ring plate (118) is fixedly connected in the middle, and a Y-shaped air duct (119) is provided inside the ventilation ring plate (118) to connect the two ends. A top pipe (120) extending into the conical cavity (116) is fixedly connected to one end of the ventilation ring plate (118), and a convex surface (121) is provided at the other end of the ventilation ring plate (118). The inner wall of one end of the connecting hole (114) is slidably connected to a rotating ring (122), and a sliding groove (123) is provided on the outer wall of the rotating ring (122). A fixed bead (124) is slidably connected in the sliding groove (123), and the fixed bead (124) is fixedly connected in the connecting hole. A concave surface (125) corresponding to the convex surface (121) is provided at one end of the rotating ring (122); A temperature control component (126) is installed at one end of the sleeve ring. The temperature control component (126) includes a driven wheel (127) and a Bourdon tube (128). One end of the driven wheel (127) is fixedly connected to a rod frame (129). One end of the connecting hole (114) is fixedly connected to a sealing cover plate (130). The rod frame (129) is rotatably connected to the sealing cover plate (130). One end of the rotating ring (122) is provided with a spline portion (131). One end of the rod frame (129) is provided with a spline groove (132) slidably connected to the spline portion (131). A nozzle (133) is fixedly connected to the interior of the driven wheel (127). An air flow channel connected to the nozzle (133) is provided inside the rotating ring (122) and the rod frame (129).

2. The fire prevention warning device for the intermediate joint of a high-voltage cable that is easy to maintain according to claim 1 is characterized in that: One end of the Bourdon tube (128) is fixedly connected to the ring sleeve (113), the other end of the Bourdon tube (128) is rotatably connected to a connecting rod (134), one end of the connecting rod (134) is rotatably connected to a sector gear (135), the middle part of the sector gear (135) is rotatably connected to a fixing rod (136), the fixing rod (136) is fixedly connected to the ring sleeve (113), the sector gear (135) is transmission-connected to a driven wheel (127), and the Bourdon tube (128) is filled with alcohol.

3. The fire prevention warning device for the high-voltage cable intermediate joint that is easy to maintain according to claim 1 is characterized in that: The outer wall of the liquid storage tank (107) is fixedly connected to a heat sink (137), and a plurality of heat sink fins (138) are fixedly connected to the heat sink (137). The symmetrical inner shell (101) is fixed by bolts, and a filling hole (139) is provided at the top end of one of the inner shells (101), and a cap (140) is threadedly connected to the top end of the filling hole (139).

4. The fire prevention warning device for the high-voltage cable intermediate joint that is easy to maintain according to claim 3 is characterized in that: The inner wall of the outer shell (102) is fixedly connected with an arc frame (141), one end of the arc frame (141) is fixedly connected with a rubber strip (142) that is closely connected to the inner shell (101), and the arc frame (141) supports and fixes the inner shell (101) through the rubber strip (142). The upper shell (110) and the lower shell (111) are fixedly connected by bolts, one end of the upper shell (110) away from the opening groove is fixedly connected with a one-way air valve (143), and two ends of the lower shell (111) are provided with stabilizing grooves (144).

5. The fire prevention warning device for the high-voltage cable intermediate joint that is easy to maintain according to claim 1 is characterized in that: Both ends of the inner shell (101) and the outer shell (102) are provided with a sealing cavity (145), and the sealing cavity (145) is filled with fireproof mud (146). Both ends of the inner shell (101) and the outer shell (102) are fixedly connected with a wrapping layer (147), and the wrapping layer (147) is formed by winding multiple layers of sealing tape and waterproof tape.

6. The fire prevention warning device for the high-voltage cable intermediate joint that is easy to maintain according to claim 4 is characterized in that: A mounting frame (148) is provided on the outside of the outer shell (102), and a support rod (149) is fixedly connected to one side of the mounting frame (148). The outer shell (102) is fixed to the support rod (149) through a stabilizing groove (144). A bottom plate (150) is provided at the bottom end of the support rod (149). A plug-in groove (151) is provided inside the bottom plate (150) and the support rod (149), and a partition plate (152) is plugged into the plug-in groove (151).

7. The fire prevention warning device for the high-voltage cable intermediate joint that is easy to maintain according to claim 6 is characterized in that: The two sides of the partition plate (152) are symmetrically fixedly connected with a curved rubber frame (153) and a square frame (154); the square frame (154) is located at the top of the curved rubber frame (153); one side of the curved rubber frame (153) is provided with a curved surface; the partition plate (152) supports the side of the outer shell (102) through the square frame (154).

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