A special T-junction box for fire-resistant cable

Abstract

The utility model discloses a special T joint box of fire -resistant cable, including waterproof fire -resistant box, waterproof fire -resistant box door, electrical component installation bottom plate, cable T joint terminal for cable T joint, circuit breaker for branch line protection, temperature measurement type electrical fire detector for monitoring branch cable temperature, main trunk cable incoming line sealing joint, main trunk cable outgoing line sealing joint and branch cable sealing joint, the utility model carries out in the special waterproof fire -resistant box body to the fire -resistant cable branch work, and the cable of in -out box body all adopts cable sealing joint installation, and the circuit breaker and temperature measurement type electrical fire detector for branch line protection are simultaneously configured, have improved the safety of distribution line when fire -resistant cable T joint, through the T joint work of fire -resistant cable is placed in waterproof fire -resistant box body, and the circuit breaker is configured as branch line protection electrical appliance, temperature measurement type electrical fire detector real -time monitoring branch cable temperature, can in time respond to water shower, short circuit and other faults.

Description

Technical Field

[0001] This utility model belongs to the field of electrical equipment safety technology, specifically relating to a T-junction box for fire-resistant cables. Background Technology

[0002] Trunk-type power distribution is a major type of power distribution system in low-voltage power distribution systems, and using T-terminals for cable branching is a common practice.

[0003] Since fire-resistant cables are mainly used to power fire-fighting equipment, the safety of the wiring is a prerequisite for ensuring the reliable operation of the equipment. The traditional practice of using T-junctions for cable branching, where the T-junctions are not housed in dedicated enclosures and effective line protection measures are lacking at the cable branch points, can lead to cable burnout and fires when exposed to water or experiencing short circuits. This poses significant safety hazards to electrical equipment, as well as to personnel and property. Utility Model Content

[0004] The purpose of this utility model is to provide a T-junction box specifically for fire-resistant cables to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a special T-junction box for fire-resistant cables, comprising a waterproof and fire-resistant box body, a waterproof and fire-resistant box door, an electrical component mounting base plate, a cable T-junction terminal for cable T-junction, a circuit breaker for branch line protection, a temperature-measuring electrical fire detector for monitoring the temperature of branch cables, a main cable inlet sealing joint, a main cable outlet sealing joint, and a branch cable sealing joint. The electrical component mounting base plate, cable T-terminal, circuit breaker, and temperature-measuring electrical fire detector are installed inside the waterproof and fire-resistant enclosure. The main cable inlet sealing joint and branch cable sealing joint are installed on the lower surface of the waterproof and fire-resistant enclosure, and the main cable outlet sealing joint is installed on the upper surface of the waterproof and fire-resistant enclosure.

[0006] Preferably, the outer shell of the waterproof and fire-resistant box body and the waterproof and fire-resistant box door is made of metal; the outer shell of the waterproof and fire-resistant box body and the waterproof and fire-resistant box door is coated with an intumescent steel structure fireproof coating.

[0007] Preferably, the waterproof and fire-resistant box door is equipped with a lock, and the box body reaches the protection standard after the door is closed; the mounting base plate for the electrical components is made of metal.

[0008] Preferably, the cable T-terminal is made of copper and has an external insulating component, and can be configured according to the cable cross-section; the circuit breaker can be configured according to the cable cross-section.

[0009] Preferably, the main cable inlet sealing joint, the main cable outlet sealing joint, and the branch cable sealing joint are all made of metal, and the protection level meets the IP55 requirement; the temperature measuring electrical fire detector adopts a contact measurement method.

[0010] Preferably, the waterproof and fireproof box is equipped with a partition that divides the internal space of the box into an inlet cavity and an outlet cavity. The cable T-connector is located in the inlet cavity, and the circuit breaker is located in the outlet cavity.

[0011] Compared with the prior art, the technical effects and advantages of this utility model are as follows: This utility model places the branching operation of fire-resistant cables inside a special waterproof and fire-resistant box. The cables entering and leaving the box are installed with cable sealing joints. At the same time, it is equipped with circuit breakers for branch line protection and temperature measuring electrical fire detectors, which improves the safety of the power distribution line when the fire-resistant cables are T-connected.

[0012] This invention solves the problems of traditional T-connection methods, such as the lack of dedicated enclosure protection for T-connection terminals and the lack of effective line protection measures at branch points, by placing the T-connection operation of fire-resistant cables inside a waterproof and fire-resistant box and configuring circuit breakers as branch line protection devices and temperature-measuring electrical fire detectors to monitor the temperature of branch cables in real time. It can respond promptly to faults such as water spray and short circuits, reduce the risk of cable burnout and fire, and protect the safety of electrical equipment, personnel, and property.

[0013] This utility model features a waterproof and fire-resistant box and door made of metal and coated with an intumescent steel structure fireproof coating. Combined with a sealing joint with an IP55 protection rating, the entire T-junction box has excellent waterproof and fire-resistant properties, providing reliable environmental protection for the T-junction of fire-resistant cables and ensuring that fire-fighting equipment and other equipment that rely on fire-resistant cables for power supply can still operate reliably in complex environments. Attached Figure Description

[0014] Figure 1 This is a perspective view of the T-junction box for fire-resistant cables according to this utility model; Figure 2 This is a front view of the T-junction box for fire-resistant cables according to this utility model; Figure 3 This is a bottom view of the T-junction box for fire-resistant cables according to this utility model; Figure 4 This is a top view of the T-junction box for fire-resistant cables according to this utility model.

[0015] In the diagram: 1. Waterproof and fire-resistant enclosure; 2. Waterproof and fire-resistant enclosure door; 3. Electrical component mounting base plate; 4. Cable T-terminal; 5. Circuit breaker; 6. Temperature-measuring electrical fire detector; 7. Main cable inlet sealing joint; 8. Main cable outlet sealing joint; 9. Branch cable sealing joint; 10. Partition plate; 11. Inlet cavity; 12. Outlet cavity. Detailed Implementation

[0016] 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.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved with", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0018] Please see Figure 1-4 This utility model provides a technical solution: a special T-junction box for fire-resistant cables, including a waterproof and fire-resistant box body 1, a waterproof and fire-resistant box door 2, an electrical component mounting base plate 3, a cable T-junction terminal for cable T-junction 4, a circuit breaker for branch line protection 5, a temperature measuring electrical fire detector for monitoring the temperature of branch cables 6, a main cable inlet sealing joint 7, a main cable outlet sealing joint 8, and a branch cable sealing joint 9. The electrical component mounting base plate 3, cable T-terminal 4, circuit breaker 5, and temperature-measuring electrical fire detector 6 are installed inside the waterproof and fire-resistant enclosure 1. The main cable inlet sealing joint 7 and branch cable sealing joint 9 are installed on the lower surface of the waterproof and fire-resistant enclosure 1, and the main cable outlet sealing joint 8 is installed on the upper surface of the waterproof and fire-resistant enclosure 1. The outer shells of the waterproof and fire-resistant enclosure 1 and the waterproof and fire-resistant door 2 are made of metal, specifically high-strength carbon structural steel. This material has excellent impact resistance and corrosion resistance, enabling it to operate stably in complex environments. The outer shells of the waterproof and fire-resistant enclosure 1 and the waterproof and fire-resistant door 2 are coated with an intumescent steel structure fire-retardant coating. This coating has a uniform thickness and, through a special process, bonds tightly to the metal outer shell. When exposed to high temperatures, the coating rapidly expands, forming a dense fire-resistant and heat-insulating layer that effectively blocks heat transfer, thereby protecting the electrical components inside the enclosure. The waterproof and fireproof enclosure door 2 is equipped with a lock made of stainless steel, which has excellent rust resistance. The lock is ergonomically designed for easy and quick operation. When the door is closed, the lock securely locks the enclosure to an IP65 protection standard, effectively preventing water, dust, and other impurities from entering and providing a safe and stable working environment for the internal components. The electrical component mounting plate 3 is made of metal with a galvanized surface for enhanced corrosion resistance. Multiple mounting holes are provided on the plate for easy fixing and installation of electrical components. The position and size of these holes are precisely designed to accommodate electrical components of different specifications. The cable T-terminal 4 is made of copper with external insulation. The copper is high-purity oxygen-free copper, possessing excellent conductivity to ensure the stability and reliability of the cable connection. The external insulation is made of high-temperature resistant, high-insulation engineering plastic, effectively preventing leakage and short circuits. The cable T-terminal 4 can be configured according to the cable cross-section. By replacing different specifications of the terminal body and adapter components, it can meet the connection requirements of various cable cross-sections, exhibiting strong versatility and flexibility. The circuit breaker 5 can also be configured according to the cable cross-section. When selecting the circuit breaker 5, precise calculations are performed based on parameters such as the cable's rated current and short-circuit current to ensure that the circuit breaker 5 can promptly trip and disconnect the circuit in case of overload or short-circuit faults in the branch line, effectively protecting the branch line. The main cable inlet sealing joint 7, main cable outlet sealing joint 8, and branch cable sealing joint 9 are all made of metal, specifically stainless steel, possessing excellent corrosion resistance and mechanical strength. The sealing joints have a multi-layered sealing structure internally, including sealing rings and gaskets, effectively preventing water and gas from entering the enclosure. Their protection level meets IP55 requirements, allowing them to operate normally even in humid and dusty environments. The temperature-measuring electrical fire detector 6 uses a contact measurement method; the detector's sensing part directly contacts the branch cable, enabling real-time and accurate monitoring of cable temperature changes. The detector features a high-precision temperature sensor and sensitive signal processing circuitry. When the detected cable temperature exceeds a set threshold, it quickly issues an alarm signal, providing strong support for the timely detection and handling of potential electrical fire hazards. The waterproof and fire-resistant enclosure 1 is equipped with a partition 10. The partition 10 is made of the same metal material as the enclosure shell, and has a certain thickness and strength, effectively separating the internal space of the enclosure. The partition 10 divides the internal space of the enclosure into an inlet cavity 11 and an outlet cavity 12. This partition design makes the cable entry and exit more orderly and avoids mutual interference between lines. The cable T-terminal 4 is located in the inlet cavity 11, facilitating the connection operation of the main cable and branch cables; the circuit breaker 5 is located in the outlet cavity 12, facilitating the protection and control of branch lines. The inlet cavity 11 and the outlet cavity 12 are connected by a cable passage hole on the partition 10. An insulating protective sleeve is provided at the cable passage hole to prevent cable wear and leakage.

[0019] Specifically, during use, when performing T-connection of the fire-resistant cable, open the waterproof fire-resistant box door 2; the main cable enters the waterproof fire-resistant box 1 through the main cable inlet sealing joint 7, and exits the waterproof fire-resistant box 1 through the main cable outlet sealing joint 8; open the cable T-connection terminal 4, peel off the partial insulation layer of the main cable, and press the main cable into the cable T-connection terminal 4; press the branch cable into the cable T-connection terminal 4; tighten the cable T-connection terminal 4; connect the branch cable to the circuit breaker 5; the branch cable exits the waterproof fire-resistant box 1 through the branch cable sealing joint 9; install the branch cable temperature sensor and connect it to the temperature-measuring electrical fire detector 6; lock the main cable inlet sealing joint 7, the main cable outlet sealing joint 8, and the branch cable sealing joint 9; close the waterproof fire-resistant box door 2.

[0020] When performing T-connection work on fire-resistant cables, first confirm that the waterproof fire-resistant box door 2 is in the unlocked state. Open the box door by rotating or pressing the lock opening structure to ensure that there is no debris or dust on the mounting base plate 3 of electrical components and the surface of each component inside the box, so as to provide a safe and clean working environment for subsequent operations.

[0021] The main cable needs to be pre-treated to remove excess insulation at the ends and straighten the wire core. Then, it is inserted into the main cable inlet sealing joint 7 on the lower surface of the waterproof and fireproof box 1 to ensure that the cable is not excessively bent or squeezed during the insertion process to avoid damage to the wire core. After insertion, the main cable is laid along the preset path inside the box and finally exits from the main cable outlet sealing joint 8 on the upper surface of the box. At this time, an appropriate length of cable slack needs to be reserved to meet the needs of T-connection operation and subsequent maintenance.

[0022] Open the insulating protective shell of cable T-terminal 4, and use a special wire stripping tool to precisely strip the partial insulation layer of the main cable at the T-connection location. The length of the exposed wire core must be adapted to the connection end of cable T-terminal 4 to avoid excessive stripping that would expose too much wire core or too little wire core, which would affect the reliability of the connection. Smoothly press the treated main cable core into the main cable interface of cable T-terminal 4, and at the same time press the pre-treated wire core of the branch cable end into the corresponding branch interface to ensure that the wire core is in close contact with the internal conductor of the terminal. Then, by tightening the fastening bolts on the terminal or pressing the locking structure, the cable T-terminal 4 firmly clamps the main cable and the branch cable to prevent loosening or poor contact.

[0023] After the branch cable is connected to the cable T-terminal 4, the other end needs to be connected to the input terminal of the circuit breaker 5. When wiring, the phase wire and neutral wire must be connected correctly according to the wiring markings of the circuit breaker 5, and the terminals must be tightened in place to avoid overheating caused by loose connections. After the connection is completed, the remaining part of the branch cable passes through the branch cable sealing joint 9 on the lower surface of the waterproof and fireproof box 1. During the process of passing through, the cable route must be kept neat and not rubbed or squeezed with other parts inside the box.

[0024] The temperature sensor probe of the temperature-measuring electrical fire detector 6 is tightly attached to the outer surface of the cable branch connection to ensure full contact between the probe and the cable insulation layer, so as to achieve accurate contact temperature measurement. Then, the probe connection wire is laid along a reasonable path inside the box and connected to the host interface of the temperature-measuring electrical fire detector 6 to complete the circuit connection between the sensor and the detector, ensuring that the detector can collect temperature data normally after being powered on.

[0025] Tighten the compression nuts of the main cable inlet sealing joint 7, the main cable outlet sealing joint 8, and the branch cable sealing joint 9 respectively, so that the internal seals of the joints tightly wrap the cable outer sheath, achieving the sealing effect required by the IP55 protection level, and preventing moisture, dust and other impurities from entering the box through the cable entry point; finally, close the waterproof and fireproof box door 2 and lock the box door with the lock to ensure that the sealing strips of the box door and the edge of the box are tightly fitted, further enhancing the waterproof and dustproof performance of the box.

[0026] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A T-junction box specifically for fire-resistant cables, characterized in that, It includes a waterproof and fire-resistant enclosure (1), a waterproof and fire-resistant enclosure door (2), an electrical component mounting base plate (3), a cable T-connection terminal for cable T-connection (4), a circuit breaker for branch line protection (5), a temperature-measuring electrical fire detector for monitoring the temperature of branch cables (6), a main cable inlet sealing joint (7), a main cable outlet sealing joint (8), and a branch cable sealing joint (9). The electrical component mounting base plate (3), cable T-terminal (4), circuit breaker (5) and temperature measuring electrical fire detector (6) are installed inside the waterproof and fireproof enclosure (1). The main cable inlet sealing joint (7) and branch cable sealing joint (9) are installed on the lower surface of the waterproof and fireproof enclosure (1). The main cable outlet sealing joint (8) is installed on the upper surface of the waterproof and fireproof enclosure (1).

2. The T-junction box for fire-resistant cables according to claim 1, characterized in that, The outer shells of the waterproof and fire-resistant box body (1) and the waterproof and fire-resistant box door (2) are made of metal; the outer shells of the waterproof and fire-resistant box body (1) and the waterproof and fire-resistant box door (2) are coated with an intumescent steel structure fireproof coating.

3. The T-junction box for fire-resistant cables according to claim 1, characterized in that, The waterproof and fireproof box door (2) is equipped with a lock, and the box body reaches the protection standard after the box door is closed; the electrical component mounting base plate (3) is made of metal.

4. A T-junction box for fire-resistant cables according to claim 1, characterized in that, The cable T-terminal (4) is made of copper and has an external insulating component, and can be configured according to the cable cross-section; the circuit breaker (5) can be configured according to the cable cross-section.

5. A T-junction box for fire-resistant cables according to claim 1, characterized in that, The main cable inlet sealing joint (7), the main cable outlet sealing joint (8), and the branch cable sealing joint (9) are all made of metal and meet the IP55 protection level requirements; the temperature measuring electrical fire detector (6) adopts a contact measurement method.

6. A T-junction box for fire-resistant cables according to claim 1, characterized in that, The waterproof and fire-resistant box (1) is provided with a partition (10), which divides the internal space of the box into an inlet cavity (11) and an outlet cavity (12). The cable T-terminal (4) is located in the inlet cavity (11), and the circuit breaker (5) is located in the outlet cavity (12).

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