High-voltage cable branch box

Abstract

The invention discloses a high-voltage cable branch box, and belongs to the field of cable branch boxes, the high-voltage cable branch box comprises a cable branch box shell, a bus chamber is arranged in the cable branch box shell, a cable chamber is arranged below the bus chamber, a wiring pipe body is inserted in the bus chamber, a cable main body is arranged in the cable chamber, and the cable main body is arranged in the cable branch box shell. The cable main body is fixedly inserted into the wiring pipe body, dry powder is arranged in the annular cavity, and a fire extinguishing assembly for the dry powder to flow out during ignition is arranged in the annular cavity. Through the annular cavity, the spraying cavity and the hot melting block, when the sparking phenomenon occurs, due to the fact that the temperature of the cable head rises, the hot melting block located at the connecting part of the terminal and the cable head melts, the pressurizing pipe is opened, dry powder in the annular cavity is rapidly released, the dry powder flows to the part, on fire, of the cable head, and the fire extinguishing operation is achieved; the occurrence of fire of the high-voltage cable branch box is effectively reduced, and the use safety of the cable branch box main body is ensured.

Description

Technical Field

[0001] The present invention relates to the field of cable branch boxes, and more particularly to a high-voltage cable branch box. Background Art

[0002] The high-voltage cable branch box is a device used to distribute high-voltage cables in the power system. It is mainly used to provide cable branching, merging, conversion and other functions in the high-voltage cable system to ensure that power is transmitted reliably and efficiently to different users or equipment.

[0003] The wiring method of the high-voltage cable branch box is that one of the cables is connected from the busbar room and connected to the cables of other branch circuits. The cables of the branch circuits are then connected to loads to transmit electricity to various places for use. During peak hours of electricity consumption, due to the increase in the load on the branch circuit, the cable body used to connect the branch circuit will be overloaded. The current on the branch circuit is too large, and the current gradually generates too much heat, eventually causing a spark at the interface of the cable. When a spark occurs, the local temperature of the cable may rise to several thousand degrees Celsius, which will ignite the part of the cable containing the sheath wire in an instant. If it is not discovered and handled slowly, it will cause a fire. In severe cases, it will cause the entire cable branch box to explode, affecting the safety of residents' lives. Summary of the invention

[0004] In view of the problems existing in the prior art, an object of the present invention is to provide a high-voltage cable branch box.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A high-voltage cable branch box comprises a cable branch box shell, wherein a busbar chamber is arranged in the cable branch box shell, a cable chamber is arranged below the busbar chamber, a wiring tube body is inserted in the busbar chamber, a cable main body is arranged in the cable chamber, the cable main body is fixedly inserted in the wiring tube body, the busbar chamber and the cable chamber are electrically connected to the cable head, terminals are welded at the end points of the cable head, the cable main body is composed of the cable head and the terminal, a jack is provided on the terminal, the wiring tube body is composed of two mutually symmetrical protective tubes, the cable main body can be inserted in the protective tube, a threaded groove is provided in the protective tube, a slider is slidably provided inside one end of the protective tube, and current can pass through the two cable main bodies through the slider, an inner sleeve is fixedly provided inside the protective tube, the interior of the inner sleeve is a wire insertion cavity, the outer diameter of the inner sleeve is smaller than the inner diameter of the protective tube, the space between the inner sleeve and the protective tube is an annular cavity, dry powder is provided in the annular cavity, and a fire extinguishing component for flowing out dry powder when ignited is provided in the annular cavity.

[0007] Furthermore, the fire extinguishing assembly includes a limiting tube fixedly arranged in the annular cavity, an injection cavity connected to the annular cavity is opened in the limiting tube, a plurality of groups of pressurized tubes are equidistantly arranged on the inner circumference of the limiting tube, one end of each group of pressurized tubes is connected to the injection cavity, and a hot melt block is fixedly arranged on the other end port of each group of pressurized tubes, the hot melt block separates the pressurized tube from the wire insertion cavity, and the inner diameter of the wire insertion cavity is the same as the outer diameter of the cable head.

[0008] Furthermore, the inner wall of the wire insertion cavity is fixedly provided with a first clamping ring and a second clamping ring from the outside to the inside, respectively, the first clamping ring and the second clamping ring have an elastic contraction function, the interiors of the first clamping ring and the second clamping ring are hollowed out and are connected to the vacuum cavity, and the first clamping ring and the second clamping ring protrude from the inner wall of the wire insertion cavity when the cable body is not inserted.

[0009] Furthermore, the annular cavity is divided into a vacuum cavity and a dry powder cavity from outside to inside, air is arranged inside the vacuum cavity, dry powder is arranged inside the dry powder cavity and the injection cavity, and a ring plate is arranged in the annular cavity for sliding sealing.

[0010] Furthermore, the first clamping ring and the second clamping ring are respectively located at two ends of the ring cavity, the limiting tube is located at the outer ring of the second clamping ring, the second clamping ring is connected to the injection cavity, and when the cable body is inserted into the protective tube, the ring plate is located at the end of the vacuum cavity, the inner wall of the vacuum cavity is frosted, and the inner wall of the dry powder cavity is smooth.

[0011] Furthermore, the sliding block is divided into two parts from bottom to top: a conductive block and a warning block. The warning block is partially insulated and has a pattern representing danger printed on its surface.

[0012] Furthermore, the conductive block portion of the slider can contact the two cable bodies after the slider is inserted into the wiring tube body, and two groups of power-off components for the cable bodies to push up the slider when igniting are arranged in the vacuum chamber. The power-off components include a contact block arranged on the inner circle of the ring plate, and a touch plate is fixedly installed on the outer wall of the inner sleeve in the vacuum chamber. The bottom end of the slider is fixedly connected to a conductive spring, and the conductive spring does not contact the cable body. The conductive spring is always in a compressed state after being energized.

[0013] Furthermore, the contact plate, the contact block, the conductive spring and the conductive block are electrically connected.

[0014] Furthermore, the inner wall of the wire insertion cavity is provided with a guide groove used in conjunction with the terminal, and the cable body can align the insertion hole with the thread groove through the guide groove.

[0015] Furthermore, the dry powder spraying directions of the multiple groups of pressurized tubes are all directed toward the connecting parts of the terminals and the cable ends.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention provides an annular cavity, a spray cavity and a hot melt block. When a fire occurs, the temperature at the cable head rises, and the hot melt block located at the connection part between the terminal and the cable head melts, so that the pressurized tube is opened, and the dry powder in the annular cavity is quickly released, so that the dry powder flows to the burning part of the cable head to achieve the fire extinguishing operation, effectively reduce the occurrence of fire inside the high-voltage cable branch box, and ensure the safe use of the cable branch box body.

[0018] (2) The present invention uses the principle of atmospheric pressure by providing a first clamping ring, a second clamping ring, a ring cavity and a ring plate, so that the ring plate pushes the dry powder in the ring cavity to be discharged, which can accelerate the outflow speed of the dry powder, further improve the speed of extinguishing the fire by the fire extinguishing assembly when a fire occurs, and can discharge more dry powder in the ring cavity, thereby improving the fire extinguishing effect and further ensuring the safe use of the wiring tube body.

[0019] (3) The present invention provides a ring plate, a frosted vacuum chamber and a smooth dry powder chamber. The pressure of the gas inside the ring chamber drives the ring plate to move, and the dry powder in the dry powder chamber can be pushed out through the pressurized pipe in an instant. Since the amount of dry powder flowing out through the pressurized pipe in an instant is large, the dry powder will be sprayed out through the pressurized pipe and instantly sprayed on the burning cable head, which can further improve the fire extinguishing effect, and the amount of dry powder pushed out is further increased, and the fire extinguishing efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the combination of the cable body and the wiring tube body of the present invention;

[0022] Figure 3 It is an internal cross-sectional view of the cable body and the wiring tube body of the present invention;

[0023] Figure 4 It is a schematic diagram of the disassembly of the cable body and the wiring tube body of the present invention;

[0024] Figure 5 It is a cross-sectional view of the internal structure of the protection tube of the present invention;

[0025] Figure 6 For the present invention Figure 5 A magnified view of the structure at center A;

[0026] Figure 7 For the present invention Figure 5 A magnified view of the structure at B in the middle;

[0027] Figure 8 For the present invention Figure 5A magnified view of the structure at center C.

[0028] Description of the numbers in the figure:

[0029] 1. Cable branch box shell; 2. Cable body; 3. Wiring tube body; 4. Protective tube; 6. Threaded groove; 7. Slider; 8. Fire extinguishing assembly; 9. Power-off assembly; 11. Busbar chamber; 12. Cable chamber; 21. Cable head; 22. Terminal; 23. Socket; 41. Inner sleeve; 42. Wire insertion cavity; 43. Guide groove; 44. Ring cavity; 71. Conductive block; 72. Warning block; 81. First clamping ring; 82. Second clamping ring; 83. Ring plate; 84. Limiting tube; 85. Hot melt block; 441. Vacuum chamber; 442. Dry powder chamber; 443. Spray chamber; 841. Pressurized tube; 91. Touch plate; 92. Touch block; 93. Conductive spring. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0031] See also Figures 1 to 8 A high-voltage cable branch box comprises a cable branch box housing 1, a busbar chamber 11 is arranged in the cable branch box housing 1, a cable chamber 12 is arranged below the busbar chamber 11, a wiring tube body 3 is inserted in the busbar chamber 11, a cable main body 2 is arranged in the cable chamber 12, the cable main body 2 is fixedly inserted in the wiring tube body 3, the busbar chamber 11 and the cable chamber 12 are electrically connected to the cable head 21, the end point of the cable head 21 is welded with a terminal 22, the cable main body 2 is composed of the cable head 21 and the terminal 22, the terminal 22 is provided with a jack 23, the wiring tube body 3 is The protective tube 4 is composed of two symmetrical protective tubes 4, in which the cable body 2 can be inserted. A threaded groove 6 is provided in the protective tube 4. A slider 7 is slidably provided inside one end of the protective tube 4, and the two cable bodies 2 can pass current through the slider 7. An inner sleeve 41 is fixedly provided inside the protective tube 4. The interior of the inner sleeve 41 is a wire insertion cavity 42. The outer diameter of the inner sleeve 41 is smaller than the inner diameter of the protective tube 4. The space between the inner sleeve 41 and the protective tube 4 is an annular cavity 44. Dry powder is provided in the annular cavity 44. A fire extinguishing component 8 for discharging dry powder when igniting is provided in the annular cavity 44.

[0032] The fire extinguishing assembly includes a limiting tube 84 fixedly arranged in the annular cavity 44, in which an injection cavity 443 connected to the annular cavity 44 is opened, and a plurality of groups of pressurizing tubes 841 are equidistantly arranged on the inner circumference of the limiting tube 84, and one end of each group of pressurizing tubes 841 is connected to the injection cavity 443, and a hot melt block 85 is fixedly arranged on the other end of each group of pressurizing tubes 841, and the hot melt block 85 separates the pressurizing tube 841 from the wire insertion cavity 42, and the inner diameter of the wire insertion cavity 42 is the same as the outer diameter of the cable head 21.

[0033] The dry powder spraying directions of the multiple groups of pressurizing tubes 841 are all aimed at the connection part between the terminal 22 and the cable head 21.

[0034] The cable body 2 used to connect the busbar chamber 11 supplies power to the cable body 2 used to connect the branch wires. When the two cable bodies 2 in the wiring tube body 3 begin to spark, the temperature of the cable ends 21 of the two cable bodies 2 quickly rises to several thousand degrees Celsius, and the rubber part of the cable ends 21 melts in an instant and causes the cable ends 21 to catch fire. At this time, due to the increase in temperature, the hot melt block 85 located at the connection part between the terminal 22 and the cable end 21 melts, and the pressurizing tube 841 is opened at this time to release the dry powder in the annular cavity 44, so that the dry powder flows out to the connection part between the terminal 22 and the cable end 21 to extinguish the fire. When the cable end 21 catches fire due to the spark, the dry powder in the annular cavity 44 can be quickly released, so that the dry powder flows to the ignited part of the cable end 21 to realize the fire extinguishing operation, effectively reducing the occurrence of fire in the high-voltage cable branch box and ensuring the safe use of the cable branch box body.

[0035] The hot melt block 85 here can be made of a material that melts at 120 degrees Celsius, such as paraffin.

[0036] like Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the inner wall of the wire insertion cavity 42 is fixedly provided with a first clamping ring 81 and a second clamping ring 82 from the outside to the inside, respectively. The first clamping ring 81 and the second clamping ring 82 have an elastic contraction function. The interiors of the first clamping ring 81 and the second clamping ring 82 are hollowed out and are connected to the vacuum cavity 441. The first clamping ring 81 and the second clamping ring 82 protrude from the inner wall of the wire insertion cavity 42 when the cable body 2 is not inserted.

[0037] The annular cavity 44 is divided into a vacuum cavity 441 and a dry powder cavity 442 from outside to inside. Air is arranged inside the vacuum cavity 441 , and dry powder is arranged inside the dry powder cavity 442 and the injection cavity 443 . A ring plate 83 is arranged for sliding sealing in the annular cavity 44 .

[0038] Since the first clamping ring 81 and the second clamping ring 82 protrude from the inner wall of the wire insertion cavity 42 when the cable body 2 is not inserted into the wire insertion cavity 42, when the cable body 2 is inserted into the wire insertion cavity 42, the first clamping ring 81 and the second clamping ring 82 are squeezed by the cable head 21, and the first clamping ring 81 will shrink to squeeze the internal gas into the vacuum cavity 441. At this time, the gas in the vacuum cavity 441 will push the ring plate 83 to move toward the dry powder cavity 442, and the dry powder in the dry powder cavity 442 will be squeezed. When the hot melt block 85 melts, the dry powder passes through the pressurized tube 841 flows out. Due to the effect of the gas in the vacuum chamber 441, the air pressure in the vacuum chamber 441 is greater than the air pressure outside the vacuum chamber 441. At this time, the gas in the vacuum chamber 441 will still push the ring plate 83 to continue moving toward the dry powder chamber 442, and push the dry powder in the dry powder chamber 442 to flow out, thereby accelerating the outflow speed of the dry powder, further improving the speed of extinguishing the fire by the fire extinguishing assembly 8 when a fire occurs, and being able to discharge more dry powder in the ring chamber 44, thereby improving the fire extinguishing effect and further ensuring the safety of the wiring tube body 3.

[0039] like Figures 3 to 5 As shown, the first clamping ring 81 and the second clamping ring 82 are respectively located at the two ends of the ring cavity 44, the limiting tube 84 is located at the outer ring of the second clamping ring 82, the second clamping ring 82 is connected to the injection cavity 443, and when the cable body 2 is inserted into the protective tube 4, the ring plate 83 is located at the end of the vacuum cavity 441, the inner wall of the vacuum cavity 441 is frosted, and the inner wall of the dry powder cavity 442 is smooth.

[0040] First, the wiring tube body 3 is inserted into the wiring cavity 42, and the first clamping ring 81 and the second clamping ring 82 are squeezed and contracted. When the first clamping ring 81 contracts, due to the frosting treatment of the inner wall of the vacuum cavity 441, the friction force is the same as the gas pressure in the vacuum cavity 441 and balanced, and the ring plate 83 will move to the end of the vacuum cavity 441. When the hot melt block 85 melts, the gas in the vacuum cavity 441 pushes the ring plate 83 to move. Due to the smooth treatment of the inner wall of the dry powder cavity 442, the friction force is much smaller than that inside the vacuum cavity 441. Due to the gas pressure, the ring plate 83 only needs to move a short distance, and the ring plate 83 can be quickly pushed by the gas in the vacuum chamber 441 and slide to one end of the dry powder chamber 442, and the dry powder in the dry powder chamber 442 is pushed out through the pressurized tube 841 in an instant. Since the amount of dry powder flowing out through the pressurized tube 841 in an instant is large, the dry powder will be sprayed out through the pressurized tube 841 and instantly sprayed on the burning cable head 21, which can further improve the fire extinguishing effect, and the amount of dry powder pushed out is further increased, and the fire extinguishing efficiency is higher.

[0041] like Figures 3 to 6As shown, the conductive block 71 of the slider 7 can contact the two cable bodies 2 after the slider 7 is inserted into the wiring tube body 3, and two groups of cable bodies 2 are arranged in the vacuum chamber 441 to push up the power-off assembly 9 of the slider 7 when igniting. The power-off assembly 9 includes a contact block 92 arranged on the inner circle of the ring plate 83, and the contact plate 91 is fixedly installed on the outer wall of the inner sleeve 41 in the vacuum chamber 441. The bottom end of the slider 7 is fixedly connected to a conductive spring 93, which does not contact the cable body 2 and is always in a compressed state after being energized.

[0042] The contact plate 91 , the contact block 92 , the conductive spring 93 and the conductive block 71 are electrically connected.

[0043] The slider 7 is divided into two parts from bottom to top: a conductive block 71 and a warning block 72 .

[0044] When the cable body 2 is inserted into the plug-in cavity 42, the first clamping ring 81 contracts to push the internal gas into the vacuum cavity 441. At the same time, the gas in the first clamping ring 81 will push the ring plate 83 to move to the end of the vacuum cavity 441 during the movement. At this time, during the movement of the ring plate 83, since the contact block 92 is always in contact with the contact plate 91, the conductive spring 93 will always be in a powered state, and the slider 7 will remain in the wiring tube body 3 until a spark occurs. After the hot melt block 85 is melted, the push ring moves into the dry powder cavity 442. At this time, the contact block 92 is separated from the contact plate 91, and the conductive spring 93 is powered off. The conductive spring 93 stretches to lift the slider 7. At this time, the conductive block 71 is separated from the terminals 22 on the two cable bodies 2, and the two cable bodies 2 are separated and disconnected from each other, thereby realizing the power-off operation, timely interrupting the spark phenomenon, and cooperating with the fire extinguishing component 8 to extinguish the burning cable head 21, further ensuring the safety of the wiring tube body 3.

[0045] It should be noted here that when the conductive spring 93 is energized, the elastic force is less than the gravity of the slider 7. After the power is off, the conductive spring 93 is a spring whose own elastic force is greater than the gravity of the slider 7. The single turns of the spring are not in contact or insulated. When the spring is energized, it is equivalent to an energized solenoid. Each turn of the spring is equivalent to a circular current. The current direction in each turn of the spring is the same. According to the mutual attraction between currents in the same direction, each turn of the spring attracts the adjacent spring, so the spring as a whole will shrink.

[0046] like Figures 3 to 5 As shown, the warning block 72 is partially insulated and has a pattern representing danger printed on its surface.

[0047] When sparks occur, the conductive spring 93 pushes the slider 7 out of the wiring tube body 3. At this time, after the slider 7 moves up, the warning block 72 of the slider 7 is partially exposed from the wiring tube body 3. When the staff is inspecting, they can observe the protruding warning block 72 and know that sparks have occurred in this part of the cable body 2, which needs to be inspected and processed. This makes it easy to quickly and accurately find the problem after the spark has occurred, thereby improving the efficiency of inspection and maintenance.

[0048] like Figures 3 to 5 As shown, the inner wall of the wire insertion cavity 42 is provided with a guide groove 43 used in conjunction with the terminal 22 , and the cable body 2 can align the insertion hole 23 with the thread groove 6 through the guide groove 43 .

[0049] When the cable body 2 for connecting the branch line needs to be connected to the cable body 2 in the busbar chamber 11, the cable body 2 is directly inserted into the wiring tube body 3, and the terminal 22 can be placed along the direction of the guide groove 43, and then the cable body 2 is inserted into the wiring tube body 3. Since the outer diameter of the cable head 21 is the same as the inner diameter of the wire insertion cavity 42, and the first clamping ring 81 and the second clamping ring 82 protrude from the inner wall of the wire insertion cavity 42 when the cable body 2 is not inserted, the cable head 21 will squeeze the first clamping ring 81 and the second clamping ring 82 during the insertion of the wire insertion cavity 42. Due to the elastic contraction function of the first clamping ring 81 and the second clamping ring 82, and the vacuum cavity 441 contains gas, the dry powder cavity 4 The dry powder in 42 will enter the second clamping ring 82 under the condition of being squeezed, so that the second clamping ring 82 and the first clamping ring 81 always exert pressure on the cable wire end 21 and realize the action of clamping the cable wire end 21. When the dry powder is filled into the second clamping ring 82, the second clamping ring 82 will expand and then fill the gap between the terminal 22 and the cable wire end 21, so that the second clamping ring 82 is stuck between the terminal 22 and the cable wire end 21. The entire cable body 2 can no longer be pulled out. The installation method is simple, and the connection between the cable body 2 and the wiring tube body 3 after installation is more stable. Even if it is not touched during maintenance, there will be no poor contact between the cable body 2 and the slider 7.

[0050] When a fire occurs, the entire fire extinguishing assembly 8 and the power-off assembly 9 work. At this time, since the ring plate 83 has moved to the end of the dry powder chamber 442, the gas in the vacuum chamber 441 is distributed in the entire ring chamber 44. The gas in the vacuum chamber 441 can no longer support and expand the first clamping ring 81. Since the dry powder in the ring chamber 44 is sprayed out, the dry powder cannot support and expand the second clamping ring 82. At this time, the first clamping ring 81 and the second clamping ring 82 are both in a contracted state, and the clamping effect on the cable head 21 almost disappears. During maintenance, the cable head 21 can be directly pulled out of the wiring tube body 3, which facilitates the disassembly of the wiring tube body 3 and the cable main body 2, and facilitates maintenance.

[0051] Instructions for use: The cable body 2 used to connect the busbar chamber 11 supplies power to the cable body 2 used to connect the branch wires. When the two cable bodies 2 in the wiring tube body 3 begin to spark, the temperature of the cable ends 21 of the two cable bodies 2 quickly rises to several thousand degrees Celsius, and the rubber part of the cable ends 21 melts in an instant and causes the cable ends 21 to catch fire. At this time, due to the increase in temperature, the hot melt block 85 located at the connection part between the terminal 22 and the cable end 21 melts, and the pressurizing tube 841 is opened at this time, releasing the dry powder in the annular cavity 44, allowing the dry powder to flow out to the connection part between the terminal 22 and the cable end 21 to extinguish the fire. When the cable end 21 catches fire due to the spark, the dry powder in the annular cavity 44 can be quickly released, allowing the dry powder to flow to the ignited part of the cable end 21 to achieve the fire extinguishing operation.

[0052] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-voltage cable branch box, comprising a cable branch box housing (1), wherein a busbar chamber (11) is arranged in the cable branch box housing (1), a cable chamber (12) is arranged below the busbar chamber (11), a wiring tube body (3) is inserted in the busbar chamber (11), a cable body (2) is arranged in the cable chamber (12), the cable body (2) is fixedly inserted in the wiring tube body (3), the busbar chamber (11) and the cable chamber (12) are electrically connected to a cable head (21), a terminal (22) is welded at the end of the cable head (21), the cable body (2) is composed of the cable head (21) and the terminal (22), and a socket (23) is provided on the terminal (22), Features: The wiring tube body (3) is composed of two mutually symmetrical protective tubes (4), the cable body (2) can be inserted into the protective tube (4), a thread groove (6) is provided in the protective tube (4), a slider (7) is slidably provided inside one end of the protective tube (4), and the two cable bodies (2) can pass current through the slider (7), an inner sleeve (41) is fixedly provided inside the protective tube (4), the interior of the inner sleeve (41) is a wire insertion cavity (42), the outer diameter of the inner sleeve (41) is smaller than the inner diameter of the protective tube (4), the space between the inner sleeve (41) and the protective tube (4) is an annular cavity (44), dry powder is provided in the annular cavity (44), and a fire extinguishing component (8) for discharging dry powder when ignited is provided in the annular cavity (44).

2. A high voltage cable branch box according to claim 1, characterized in that: The fire extinguishing assembly (8) comprises a limiting tube (84) fixedly arranged in the annular cavity (44), wherein an injection cavity (443) communicating with the annular cavity (44) is provided in the limiting tube (84), and a plurality of groups of pressurizing tubes (841) are equidistantly arranged on the inner circumference of the limiting tube (84), wherein one end of each group of pressurizing tubes (841) is communicated with the injection cavity (443), and a hot melt block (85) is fixedly arranged at the other end of each group of pressurizing tubes (841), wherein the hot melt block (85) separates the pressurizing tube (841) from the wire insertion cavity (42), and the inner diameter of the wire insertion cavity (42) is the same as the outer diameter of the cable head (21).

3. A high voltage cable branch box according to claim 2, characterized in that: The inner wall of the wire insertion cavity (42) is fixedly provided with a first clamping ring (81) and a second clamping ring (82) from the outside to the inside, respectively. The first clamping ring (81) and the second clamping ring (82) have an elastic contraction function. The interiors of the first clamping ring (81) and the second clamping ring (82) are hollowed out and are connected to the vacuum cavity (441). The first clamping ring (81) and the second clamping ring (82) protrude from the inner wall of the wire insertion cavity (42) when the cable body (2) is not inserted.

4. A high voltage cable branch box according to claim 3, characterized in that: The annular cavity (44) is divided into a vacuum cavity (441) and a dry powder cavity (442) from the outside to the inside. Air is arranged inside the vacuum cavity (441). Dry powder is arranged inside the dry powder cavity (442) and the injection cavity (443). A ring plate (83) is arranged in the annular cavity (44) for sliding sealing.

5. A high voltage cable branch box according to claim 4, characterized in that: The first clamping ring (81) and the second clamping ring (82) are respectively located at two ends of the ring cavity (44); the limiting tube (84) is located at the outer ring of the second clamping ring (82); the second clamping ring (82) is connected to the injection cavity (443); when the cable body (2) is inserted into the protective tube (4), the ring plate (83) is located at the end of the vacuum cavity (441); the inner wall of the vacuum cavity (441) is frosted, and the inner wall of the dry powder cavity (442) is smooth.

6. A high voltage cable branch box according to claim 5, characterized in that: The slider (7) is divided into two parts from bottom to top: a conductive block (71) and a warning block (72); the warning block (72) is partially insulated and has a pattern representing danger printed on its surface.

7. A high voltage cable branch box according to claim 6, characterized in that: The conductive block (71) of the slider (7) can contact the two cable bodies (2) after the slider (7) is inserted into the wiring tube body (3). The vacuum chamber (441) is provided with a power-off assembly (9) for the two cable bodies (2) to push up the slider (7) when igniting. The power-off assembly (9) includes a contact block (92) arranged on the inner circle of the ring plate (83). The contact plate (91) is fixedly mounted on the outer wall of the inner sleeve (41) in the vacuum chamber (441). The bottom end of the slider (7) is fixedly connected to a conductive spring (93). The conductive spring (93) does not contact the cable body (2). The conductive spring (93) is always in a compressed state after being energized.

8. A high voltage cable branch box according to claim 7, characterized in that: The contact plate (91), the contact block (92), the conductive spring (93) and the conductive block (71) are electrically connected.

9. A high voltage cable branch box according to claim 8, characterized in that: The inner wall of the wire insertion cavity (42) is provided with a guide groove (43) used in conjunction with the terminal (22), and the cable body (2) can align the insertion hole (23) with the thread groove (6) through the guide groove (43).

10. A high voltage cable branch box according to claim 9, characterized in that: The dry powder spraying directions of the multiple groups of pressurized tubes (841) are all directed toward the connection portion between the terminal (22) and the cable head (21).

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