Fireproof and explosion-proof pressure relief structure of cable branch box

Abstract

The utility model discloses a cable branch box's fire prevention and explosion prevention pressure relief structure in the field of cable branch box, including cable branch box body, the inside fixed mounting of cable branch box body has branch box control gate, is installed on the gate lever of branch box control gate, the inside of cable branch box body is provided with pull gate mechanism, the right side of cable branch box body is provided with pressure relief mechanism, buckle ring body is located the outside of gate lever, the lower end fixed mounting of buckle ring body has connecting seat, the lower end fixed connection of connecting seat has iron wire, the fixed installation of first pressure relief pipeline and second pressure relief pipeline has on the box wall of cable branch box body right -hand end, and the fire prevention and explosion prevention pressure relief structure of this cable branch box is through the cooperation of pull gate mechanism and pressure relief mechanism, realized the initiative defense to fire, overheat and high pressure explosion etc. multiple dangers, can automatic power off when temperature is unusual, can also fast pressure relief when air pressure rises, significantly improved the safety reliability and service life of cable branch box.

Description

Technical Field

[0001] This utility model relates to the field of cable branch boxes, specifically a fireproof, explosion-proof, and pressure-relief structure for cable branch boxes. Background Technology

[0002] A cable distribution box is a box-type device used in power systems for branching, connecting, and distributing cable lines. It primarily serves to extract electrical energy from the main cable line and distribute it to different branches, providing a safe and convenient wiring and management method for multi-circuit power supply. This device typically consists of a well-insulated enclosure, conductive connection terminals, a protective sealing structure, and safety switch components. It is waterproof, dustproof, and corrosion-resistant, enabling long-term stable operation in outdoor or underground environments. Cable distribution boxes effectively simplify cable wiring structures, reduce construction workload, improve the flexibility and reliability of the power supply system, and facilitate subsequent inspection and maintenance. They are widely used in urban power distribution networks, residential power supply, industrial parks, and road lighting systems, enabling the rational distribution and protection of electrical energy, ensuring the safe, efficient, and continuous operation of the power supply system. They are an indispensable and important electrical equipment in modern power distribution engineering.

[0003] Existing cable distribution boxes generally suffer from insufficient fire and explosion protection performance during long-term operation. When internal circuits experience abnormal conditions such as overheating or short circuits due to excessive load or high ambient temperature, the cable distribution box often fails to cut off power in time, causing continuous current flow that leads to insulation erosion and potentially triggers an electrical fire. Simultaneously, under high temperatures, flammable gases and pressure generated inside the box cannot be effectively released, easily leading to gas accumulation in the confined space. The presence of an electric arc or ignition source can cause an explosion, damaging equipment and endangering the safety of operators. Furthermore, existing pressure relief structures are mostly slow to react or lack sufficient sealing, failing to achieve automatic adjustment and reliable reset under different operating conditions, resulting in reduced equipment safety. Therefore, this invention designs a fire-proof and explosion-proof pressure relief structure for cable distribution boxes to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a fireproof and explosion-proof pressure relief structure for a cable branch box, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A fireproof and explosion-proof pressure relief structure for a cable branch box includes a cable branch box body. A branch box control gate is fixedly installed inside the cable branch box body, and a gate arm is mounted on the control gate. A pulling mechanism is provided inside the cable branch box body. A pressure relief mechanism is provided on the right side of the cable branch box body. The pulling mechanism includes a snap-fit ​​ring located outside the gate arm. A connecting seat is fixedly installed at the lower end of the snap-fit ​​ring, and a wire is fixedly connected to the lower end of the connecting seat. The pressure relief mechanism includes a first pressure relief pipe, an electrically controlled valve, a pressure sensor, a second pressure relief pipe, a mounting bracket, a return spring, a sealing seat, a sealing plug, a sealing ring, and a controller. The first and second pressure relief pipes are fixedly installed on the right wall of the cable branch box body. A pressure sensor is fixedly installed on the inner wall of the right end of the cable branch box body, and a controller is located in front of the pressure sensor.

[0007] Optionally, the switch mechanism further includes a box base plate, a motor bracket, a drive motor, a bearing bracket, and a cable reel, with the box base plate fixedly installed at the bottom of the cable branch box.

[0008] Optionally, a motor bracket is fixedly installed on the bottom plate of the housing, and a drive motor is fixedly installed on the upper end of the motor bracket.

[0009] Optionally, a bearing bracket is provided behind the drive motor, and a winding reel is mounted on the bearing bracket. The winding reel is connected to the transmission end of the drive motor.

[0010] Optionally, the wire is wound on a reel and fixedly connected downwards to the connecting seat.

[0011] Optionally, an electrically controlled valve is installed on the first pressure relief pipe, and the electrically controlled valve is electrically connected to the controller.

[0012] Optionally, a mounting bracket is fixedly installed at the left end of the second pressure relief pipe, a return spring is fixedly installed on the mounting bracket, and a sealing plug is fixedly installed at the right end of the return spring.

[0013] Optionally, a sealing seat is fixedly installed at the right end of the second pressure relief pipe, and a sealing ring is fixedly installed at the right end of the sealing plug, wherein the sealing ring and the sealing seat are in an insert-fit relationship.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model is equipped with a switch-off mechanism. Through the linkage design of the drive motor, winding reel, wire, connecting seat and buckle ring, it realizes automatic power cut-off when the temperature is abnormal. It can cut off the power supply in time in the early stage of fire or equipment overheating, avoid the continuous ignition of electric arc and short circuit of electrical circuit. At the same time, the backup battery power supply structure ensures the reliability of emergency operation, making electrical protection more intelligent and safe.

[0016] 2. In this utility model, a pressure relief mechanism is provided, which adopts a dual-channel design of electronically controlled active pressure relief and elastic passive pressure relief. Through the linkage between the air pressure sensor and the electronically controlled valve, automatic pressure relief is achieved under high temperature and high pressure conditions. At the same time, the mechanical pressure relief structure formed by the combination of the return spring and the sealing plug can still complete the pressure release when the electronic control system fails, thereby achieving system safety redundancy and multi-level protection. Attached Figure Description

[0017] Figure 1 This is a three-dimensional front view structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of this utility model from a frontal view.

[0019] Figure 3 This is a three-dimensional top view of the structure of this utility model;

[0020] Figure 4 This is a three-dimensional sectional view of the structure of this utility model. Figure 1 ;

[0021] Figure 5 This is a three-dimensional sectional view of the structure of this utility model. Figure 2 ;

[0022] Figure 6 This is a three-dimensional sectional view of the structure of this utility model. Figure 3 ;

[0023] Figure 7 This utility model Figure 6 A magnified three-dimensional structural diagram of point A in the middle;

[0024] Figure 8 This utility model Figure 5 A magnified three-dimensional structural diagram of point B in the middle.

[0025] In the diagram: 1. Cable branch box; 2. Switch mechanism; 201. Box base plate; 202. Motor bracket; 203. Drive motor; 204. Bearing bracket; 205. Cable reel; 206. Wire; 207. Connecting seat; 208. Snap ring; 3. Pressure relief mechanism; 301. First pressure relief pipe; 302. Electrically controlled valve; 303. Pressure sensor; 304. Second pressure relief pipe; 305. Mounting bracket; 306. Return spring; 307. Sealing seat; 308. Sealing plug; 309. Sealing ring; 310. Controller; 4. Branch box control gate; 5. Gate arm. Detailed Implementation

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1-8In this embodiment of the present invention, a fireproof and explosion-proof pressure relief structure for a cable branch box includes a cable branch box body 1, a branch box control gate 4 fixedly installed inside the cable branch box body 1, a gate arm 5 installed at the upper end of the branch box control gate 4, a pulling mechanism 2 provided inside the cable branch box body 1, and a pressure relief mechanism 3 provided on the right side of the cable branch box body 1. In this embodiment, all components are arranged in the positions shown in the figure and are reliably connected to the cable branch box body 1 through fasteners or corresponding installation structures to ensure that the predetermined relative positional relationship can still be maintained under vibration or impact conditions.

[0030] The power-off mechanism 2 is used to automatically cut off power when an abnormal temperature is detected inside the cable branch box 1. The power-off mechanism 2 includes a box base plate 201, a motor bracket 202, a drive motor 203, a bearing bracket 204, a cable reel 205, a wire 206, a connecting seat 207, and a snap-fit ​​ring 208. The box base plate 201 is fixedly installed at the bottom of the cable branch box 1, serving to support the components of the power-off mechanism 2 and rigidly connect them to the box assembly. The motor bracket 202 is fixed... Mounted on the bottom plate 201 of the housing, it is used to define the position of the drive motor 203 and accommodate the backup battery and temperature sensor, so that the drive system can still complete the operation when the main power is abnormal; the drive motor 203 is fixedly installed on the upper end of the motor bracket 202, and the drive motor 203 is connected to the winding reel 205 through its transmission end. A bearing bracket 204 is provided behind the drive motor 203, which provides support for the winding reel 205 and ensures that the winding reel 205 remains stable when the wire 206 is wound and unwound at high speed;

[0031] The reel 205 is connected to the transmission end of the drive motor 203 and is used to rotate and take in the wire when the drive motor 203 is running. The wire 206 is wound on the outside of the reel 205, with one end fixedly connected to the reel 205 and the other end connected downward to the connecting seat 207. A snap ring 208 is fixedly installed on the upper end of the connecting seat 207. The snap ring 208 is sleeved on the outside of the gate arm 5. The snap ring 208 achieves mechanical constraint on the position of the gate arm 5 and transmission of transmission force through direct contact with the gate arm 5. The above structure combination enables the connecting seat 207 and the snap ring 208 to move smoothly along the predetermined guide direction when the reel 205 takes in the wire 206, thereby driving the gate arm 5 to produce a reliable downward pressing action.

[0032] The motor bracket 202 has a square structure and houses a temperature sensor and a backup battery. It is linked with the drive motor 203. Upon receiving an abnormal temperature signal, the drive system enters an emergency working state. When the temperature sensor detects that the internal temperature of the cable branch box 1 exceeds a preset threshold, the drive motor 203 immediately starts, driving the reel 205 to quickly wind up the wire 206. This causes the connecting seat 207 and the snap ring 208 to move downwards, thereby pressing down the gate arm 5 and realizing the rapid power-off action of the branch box control gate 4. During the startup process, the drive motor 203 tightens the wire 206 through the rotation of the reel 205, thereby driving the connecting seat 207 and the snap ring 208 in the downward direction, completing the mechanical action on the gate arm 5. This action can be regarded as an automatic power-off protection measure implemented mechanically in the early stage of a fire.

[0033] To ensure that the circuit breaker can still be operated in the event of a power outage or abnormal main power supply, the motor bracket 202 is equipped with a backup battery to provide emergency power to the drive motor 203. The backup battery is connected to the drive motor 203 and the temperature sensor through corresponding electrical interfaces and control circuits, ensuring that the circuit breaker mechanism 2 can still receive the temperature sensor signal and complete the action when the main power is interrupted, thereby improving the reliability and independent protection capability of the system under extreme conditions.

[0034] The pressure relief mechanism 3 is used to automatically release pressure when the air pressure inside the cable branch box 1 rises abnormally, so as to avoid the box bursting accident. The pressure relief mechanism 3 includes a first pressure relief pipe 301, an electric control valve 302, an air pressure sensor 303, a second pressure relief pipe 304, a mounting bracket 305, a return spring 306, a sealing seat 307, a sealing plug 308, a sealing ring 309, and a controller 310. In this embodiment, the first pressure relief pipe 301 and the second pressure relief pipe 304 are respectively fixedly installed on the right end wall of the cable branch box 1. The two serve as different pressure relief paths to undertake active and passive pressure relief tasks. The air pressure sensor 303 is fixedly installed on the right end inner wall of the cable branch box 1 to detect the air pressure inside the box in real time and transmit the measured pressure signal to the controller 310.

[0035] A controller 310 is installed in front of the pressure sensor 303. The controller 310 is electrically connected to the solenoid valve 302 and is used to receive the signal from the pressure sensor 303 and control the opening and closing of the solenoid valve 302. When the internal pressure of the chamber is detected to be higher than the safe range, the controller 310 sends an opening signal to the solenoid valve 302. The solenoid valve 302 opens the first pressure relief pipe 301 and actively releases part of the internal high-pressure gas to realize the active pressure relief function. This active pressure relief process is based on the electrically controlled release path and is suitable for pre- or rapid pressure reduction when the controller 310 and the solenoid valve 302 are working normally.

[0036] A mounting bracket 305 is fixedly installed at the left end of the second pressure relief pipe 304. A return spring 306 is fixedly installed on the mounting bracket 305. A sealing plug 308 is fixedly installed at the right end of the return spring 306. A sealing seat 307 is fixedly installed at the right end of the second pressure relief pipe 304. A sealing ring 309 is fixedly installed at the right end of the sealing plug 308. The sealing ring 309 and the sealing seat 307 have a plug-in mating structure. When the internal air pressure of the housing continues to rise to exceed the preset elastic force value of the return spring 306, the sealing plug 308 is pushed outward by the internal gas pressure, causing the sealing ring 309 to separate from the sealing seat 307, thereby forming a pressure relief channel and realizing automatic passive pressure relief. This passive pressure relief path can play a role in the event of electrical control failure or when electrical control has not yet been activated without electrical control, thereby providing mechanical redundancy protection for the system.

[0037] When the air pressure returns to normal, the reset spring 306 drives the sealing plug 308 to reset inward, and the sealing ring 309 re-inserts into the sealing seat 307 to restore the sealing state, ensuring that the cable branch box 1 returns to normal operation. This reset process is completed by the restoring force of the spring, so that the second pressure relief passage can restore the initial sealing state afterward, which facilitates the continued safe operation of the equipment and reduces the handling work during subsequent maintenance.

[0038] In this embodiment, the switch mechanism 2 drives the motor 203 to work through the signal from the temperature sensor, thereby realizing the automatic pressing action of the switch arm 5. It has the advantages of high automation and fast response speed, and can cut off the power supply in time in the early stage of fire or equipment overheating, effectively preventing the spread of electrical fire. At the same time, since the mechanism is a composite structure of mechanical transmission and electric drive, it has clear mechanical limit and connection relationship in the action path, which is conducive to achieving stable and predictable power-off action during implementation.

[0039] The pressure relief mechanism 3 achieves active pressure relief through the linkage of the pressure sensor 303 and the controller 310, and achieves mechanical passive pressure relief through the structure of the return spring 306 and the sealing plug 308, forming a dual safety protection mechanism. It can quickly release pressure when the pressure rises abnormally, effectively preventing the occurrence of explosion accidents. In addition, the dual-channel design allows for controllable pressure reduction through the first pressure relief pipe 301 when the electronic control takes priority. When the electronic control fails or the pressure exceeds the mechanical threshold, the second pressure relief pipe 304 serves as the final safe release path, ensuring the structural integrity of the box.

[0040] In summary, by coordinating the switching mechanism 2 and the pressure relief mechanism 3, this invention can automatically perform power outage and pressure relief operations when abnormal conditions such as high temperature and high pressure occur in the cable branch box 1, achieving dual safety protection effects of fire prevention and explosion prevention. This significantly improves the operational safety and system reliability of the cable branch box, ensures the stability of the power system operation and personnel safety, and facilitates subsequent maintenance and restoration operations.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fireproof and explosion-proof pressure relief structure for a cable branch box, comprising a cable branch box body (1), wherein a branch box control gate (4) is fixedly installed inside the cable branch box body (1), and a gate arm (5) is installed on the branch box control gate (4), characterized in that: The cable branch box (1) is equipped with a switch mechanism (2) inside, and a pressure relief mechanism (3) is provided on the right side of the cable branch box (1). The switch mechanism (2) includes a snap ring body (208), which is located outside the switch arm (5). A connecting seat (207) is fixedly installed at the lower end of the snap ring body (208), and a wire (206) is fixedly connected to the lower end of the connecting seat (207). The pressure relief mechanism (3) includes a first pressure relief pipe (301), an electric control valve (302), and a pneumatic pressure relief device. The cable branch box (1) includes a sensor (303), a second pressure relief pipe (304), a mounting bracket (305), a reset spring (306), a sealing seat (307), a sealing plug (308), a sealing ring (309), and a controller (310). The first pressure relief pipe (301) and the second pressure relief pipe (304) are fixedly installed on the right wall of the cable branch box (1). The air pressure sensor (303) is fixedly installed on the inner wall of the right end of the cable branch box (1). The controller (310) is located in front of the air pressure sensor (303).

2. The fireproof and explosion-proof pressure relief structure of a cable branch box according to claim 1, characterized in that: The switch mechanism (2) also includes a box bottom plate (201), a motor bracket (202), a drive motor (203), a bearing bracket (204), and a cable reel (205). The bottom of the cable branch box (1) is fixedly installed with the box bottom plate (201).

3. The fireproof and explosion-proof pressure relief structure of a cable branch box according to claim 2, characterized in that: A motor bracket (202) is fixedly installed on the bottom plate (201) of the box, and a drive motor (203) is fixedly installed on the upper end of the motor bracket (202).

4. The fireproof and explosion-proof pressure relief structure of a cable branch box according to claim 3, characterized in that: A bearing bracket (204) is provided behind the drive motor (203), and a winding reel (205) is mounted on the bearing bracket (204). The winding reel (205) is connected to the transmission end of the drive motor (203).

5. The fireproof and explosion-proof pressure relief structure of a cable branch box according to claim 1, characterized in that: The wire (206) is wound on the winding spool (205), and the wire (206) is fixedly connected downward to the connecting seat (207).

6. The fireproof and explosion-proof pressure relief structure of a cable branch box according to claim 1, characterized in that: An electrically controlled valve (302) is installed on the first pressure relief pipe (301), and the electrically controlled valve (302) is electrically connected to the controller (310).

7. The fireproof and explosion-proof pressure relief structure of a cable branch box according to claim 1, characterized in that: A mounting bracket (305) is fixedly installed on the left end of the second pressure relief pipe (304), a return spring (306) is fixedly installed on the mounting bracket (305), and a sealing plug (308) is fixedly installed on the right end of the return spring (306).

8. The fireproof and explosion-proof pressure relief structure of a cable branch box according to claim 7, characterized in that: A sealing seat (307) is fixedly installed at the right end of the second pressure relief pipe (304), and a sealing ring (309) is fixedly installed at the right end of the sealing plug (308). The sealing ring (309) and the sealing seat (307) are in an insertion relationship.

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