A double-protection explosion-proof box for cable joints

Abstract

This utility model relates to the field of explosion-proof box technology, and more particularly to a double-protection explosion-proof box for cable intermediate joints. It includes a first flame-retardant explosion-proof outer shell and a second flame-retardant explosion-proof outer shell, which are joined together to form a protective cavity. The flame-retardant explosion-proof inner shell and the main outer shell are designed as separate units, and a locking structure consisting of a plug rod, mounting slot, fixing plate, sliding rod, locking block, and elastic element allows for tool-free operation—locking upon pushing in and unlocking upon pulling out. Installation and disassembly are simple and efficient, eliminating the need for complete disassembly of the explosion-proof box, significantly reducing maintenance costs and improving equipment maintainability and operational efficiency.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof box technology, and in particular to an explosion-proof box for cable intermediate joints with dual protection. Background Technology

[0002] In power systems, cable joints are among the weakest links in cable lines, and are prone to explosions or fires due to electrical faults, environmental factors, or mechanical damage. To improve the safety and reliability of cable systems, it is necessary to physically encapsulate and protect the area where explosion-proof boxes are installed at cable joints. This limits the spread of internal combustion and explosion pressure, prevents the leakage of flames and high-temperature particles, provides mechanical protection, and blocks the influence of the external environment.

[0003] Traditional explosion-proof boxes in the existing technology mostly adopt an integrated double-layer shell structure, which consists of an outer high-strength shell and an inner heat-resistant and flame-retardant liner to form a dual protection system. This structure improves the explosion resistance and thermal protection performance to a certain extent. However, since the inner shell is usually fixedly connected to the outer shell or integrally formed, once the internal flame-retardant and heat-insulating layer fails due to long-term aging, arc erosion or local breakdown, it cannot be replaced individually. The entire explosion-proof box must be disassembled and replaced as a whole, resulting in high maintenance costs and extended power outage time.

[0004] Therefore, there is an urgent need to provide a cable intermediate joint explosion-proof box that has dual protection functions while allowing the inner protective structure to be detached and replaced. Utility Model Content

[0005] To overcome the shortcomings of traditional double-shell type explosion-proof boxes for cable joints, where the inner protective structure cannot be disassembled or replaced independently, resulting in high maintenance costs and resource waste, this utility model provides a cable joint explosion-proof box that has dual protection functions while allowing the inner protective structure to be disassembled and replaced.

[0006] To address the aforementioned issues, this utility model employs the following technical solution: a double-protection explosion-proof cable joint box, comprising a first flame-retardant explosion-proof outer shell and a second flame-retardant explosion-proof outer shell. The first and second flame-retardant explosion-proof outer shells are joined together to form a protective cavity. An installation sleeve is fitted onto one end of each of the first and second flame-retardant explosion-proof outer shells, away from each other. A flame-retardant explosion-proof inner shell is mounted on the installation sleeve, located inside the outer shell and forming a double protection. Multiple insertion rods are evenly spaced along the circumference of the installation sleeve, and multiple insertion holes matching the insertion rods are opened at corresponding positions on the first and second flame-retardant explosion-proof outer shells. Mounting slots are provided on both sides of the installation sleeve. A fixing plate is fixedly mounted on the top of the first and second flame-retardant explosion-proof outer shells. Sliding rods are slidably mounted on both sides of the fixing plate. A locking block matching the mounting slot is provided at the bottom of each sliding rod. An elastic element is fitted onto the sliding rod, with both ends of the elastic element fixedly connected to the sliding rod and the fixing plate, respectively.

[0007] Furthermore, both sides of the card block are designed as guide slope structures.

[0008] Furthermore, the inner ring of the mounting sleeve is embedded with a limiting ring, and the top of both the first flame-retardant and explosion-proof shells and the second flame-retardant and explosion-proof shells are provided with placement cylinders. The limiting ring is fixed with symmetrically distributed fixing seats, and a gas storage tank is installed on the fixing seats. One end of the gas supply pipe is connected to the opening of the gas storage tank. An air bladder is provided inside the limiting ring, and the air bladder is connected to the gas supply pipe. An air pump is installed at the end of the gas supply pipe near the gas storage tank.

[0009] Furthermore, the airbag has an overall ring-shaped structure.

[0010] Furthermore, detectors are provided on the outer top surfaces of the first flame-retardant and explosion-proof enclosure and the second flame-retardant and explosion-proof enclosure.

[0011] Furthermore, multiple intelligent warning devices are provided on the outer top surface of the first flame-retardant and explosion-proof housing and the second flame-retardant and explosion-proof housing, and the intelligent warning devices are located on both sides of the detector.

[0012] Compared with the prior art, the present invention has the following technical effects: 1. By adopting a split structure design between the flame-retardant and explosion-proof inner shell and the main outer shell, and with the locking structure composed of the insertion rod, mounting slot, fixing plate, sliding rod, locking block and elastic element, tool-free operation is achieved by pushing in to lock and pulling out to unlock. The installation and disassembly process is simple and efficient, and there is no need to disassemble the explosion-proof box as a whole, which greatly reduces maintenance costs and improves the maintainability and operation efficiency of the equipment.

[0013] 2. By setting an annular airbag inside the limiting ring and forming an air supply system through an air tank, air pump and air delivery pipe, the air pump can be started after installation to inflate the airbag, so that it expands and fits the outer surface of the intermediate joint of cables of different diameters, dynamically filling the gap and achieving self-adaptive sealing. This structure effectively improves the compatibility of the explosion-proof box with joints of various specifications, while preventing moisture and dust from entering and preventing axial leakage of internal high-pressure gas, further enhancing environmental protection capabilities. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a three-dimensional structural diagram of the first flame-retardant and explosion-proof shell, the second flame-retardant and explosion-proof shell, and the mounting sleeve of this utility model.

[0016] Figure 3 This is a three-dimensional structural diagram of the components of this utility model, including the card block, elastic element, and limiting ring.

[0017] Figure 4 This is a three-dimensional sectional view of the components of this utility model, including the placement cylinder, fixing base, and gas storage tank.

[0018] Figure 5 This is a three-dimensional structural diagram of the detector and intelligent warning device components of this utility model.

[0019] In the attached diagrams: 1: First flame-retardant and explosion-proof outer shell; 2: Second flame-retardant and explosion-proof outer shell; 3: Mounting sleeve; 4: Flame-retardant and explosion-proof inner shell; 5: Insert rod; 6: Mounting slot; 7: Fixing plate; 8: Sliding rod; 9: Locking block; 10: Elastic element; 11: Limiting ring; 12: Placement cylinder; 13: Fixing base; 14: Gas tank; 15: Gas pipe; 16: Airbag; 17: Air pump; 18: Detector; 19: Intelligent warning device. Detailed Implementation

[0020] 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.

[0021] Example 1: Please refer to Figures 1-3A double-protection explosion-proof box for cable joints includes a first flame-retardant explosion-proof outer shell 1 and a second flame-retardant explosion-proof outer shell 2. The first flame-retardant explosion-proof outer shell 1 and the second flame-retardant explosion-proof outer shell 2 are joined together to form a protective cavity. In use, the first and second flame-retardant explosion-proof outer shells 2 are respectively fitted onto both ends of the cable joint, and then the two are joined together radially and fastened at the joint with a set of high-strength bolts to ensure the sealing and mechanical strength of the overall structure. An installation sleeve 3 is fitted onto one end of the first flame-retardant explosion-proof outer shell 1 and the second flame-retardant explosion-proof outer shell 2 away from each other. A flame-retardant explosion-proof inner shell 4 is provided on the installation sleeve 3. The flame-retardant explosion-proof inner shell 4 is made of high-temperature resistant and impact-resistant composite flame-retardant material. The flame-retardant explosion-proof inner shell 4 is located inside the outer shell and forms a double protection with the outer shell. Four insertion rods 5 are evenly spaced along the circumference of the installation sleeve 3. The flame-retardant explosion-proof shell 2 has four insertion holes corresponding to the insertion rod 5. The insertion rod 5 is inserted into the insertion holes to achieve axial guidance and circumferential positioning, thus achieving preliminary assembly. The mounting sleeve 3 has mounting slots 6 on both sides. The top of the first flame-retardant explosion-proof shell 1 and the second flame-retardant explosion-proof shell 2 are fixedly mounted with a fixing plate 7. The front and rear sides of the fixing plate 7 are slidably mounted with sliding rods 8. The bottom end of the sliding rod 8 is provided with a locking block 9 that matches the mounting slot 6. In the initial use state, the locking block 9 is engaged with the mounting slot 6 to fix the mounting sleeve 3 and the flame-retardant explosion-proof inner shell 4 inside the flame-retardant explosion-proof shell. In addition, the contact surfaces on both sides of the locking block 9 are designed as guiding slope structures. This guiding slope design facilitates the mounting slot 6 to squeeze the locking block 9 during installation and disassembly. An elastic element 10 is sleeved on the sliding rod 8. The upper and lower ends of the elastic element 10 are fixedly connected to the sliding rod 8 and the fixing plate 7, respectively, to provide downward restoring force for the sliding rod 8 and the locking block 9.

[0022] In this device, the flame-retardant and explosion-proof outer shell and the flame-retardant and explosion-proof inner shell 4 adopt a split modular structure design. While ensuring dual protection functions, it realizes the independent assembly and replaceability of the inner protective component. When the flame-retardant and explosion-proof inner shell 4 needs to be replaced due to long-term aging, arc erosion, mechanical damage, or degradation of protective performance, it is not necessary to disassemble the main explosion-proof outer shell. Only an axial pulling force needs to be applied to the mounting sleeve 3 to pull it outward along the end of the outer shell. During the disassembly process, the mounting slot 6 on the mounting sleeve 3 moves with it and comes into contact with the locking block 9 fixed at the lower end of the slide rod 8. Since the locking block 9 has guide slopes on both sides, the side wall of the mounting slot 6 slides along the guide slope during the movement, generating a vertical component force, which forces the locking block 9 to overcome the elastic force of the elastic element 10 and slide upward until... Completely disengage from the mounting slot 6, thereby releasing the mechanical lock on the mounting sleeve 3. At this point, the mounting sleeve 3, together with its built-in flame-retardant and explosion-proof inner shell 4, can be removed from the main outer shell as a whole, completing the disassembly of the old part. When installing the new flame-retardant and explosion-proof inner shell 4, align the mounting sleeve 3 with the new inner shell at the main outer end and push it in axially. The insertion rod 5 on the mounting sleeve 3 is first inserted into the corresponding insertion hole at the end of the main outer shell to achieve circumferential positioning and axial guidance, preventing rotational misalignment. As the mounting sleeve 3 continues to advance, the mounting slot 6 on it presses against the locking block 9 again. When the mounting sleeve 3 is fully in place and the slot and locking block 9 are aligned, the locking block 9 automatically falls and embeds into the mounting slot 6 under the restoring force of the elastic element 10, forming a reliable mechanical lock, completing the installation and fixation of the new part.

[0023] Example 2 is based on Example 1. Please refer to Example 1. Figure 4 The mounting sleeve 3 has an embedded limiting ring 11. Both the first flame-retardant and explosion-proof outer shell 1 and the second flame-retardant and explosion-proof outer shell 2 have placement cylinders 12 at their tops. The limiting ring 11 is fixed with symmetrically distributed fixing seats 13. A gas storage tank 14 is mounted on each fixing seat 13. In the initial installation state, the gas storage tank 14 is placed inside the placement cylinder 12, which provides vertical support and positioning to prevent loosening or collision due to vibration during operation. A gas delivery pipe 15 is connected to the opening of the gas storage tank 14. At one end, an airbag 16 is provided inside the limiting ring 11. The airbag 16 is connected to the air supply pipe 15 and is used to achieve dynamic sealing between the joint area and the inner cavity of the explosion-proof box after inflation. In addition, the airbag 16 has an overall annular structure. This annular design can ensure that it fits evenly against the surface of the cable intermediate joint after inflation, forming a complete and dead-angle-free annular sealing interface, effectively blocking the axial penetration path of gas and moisture, and improving the sealing reliability. An air pump 17 is installed at the end of the air supply pipe 15 near the air storage tank 14.

[0024] When the flame-retardant and explosion-proof inner shell 4 is fully assembled into the flame-retardant and explosion-proof outer shell along with the mounting sleeve 3, and locked with the mounting slot 6 by the locking block 9, the air pump 17 is started to deliver the gas in the gas storage tank 14 to the annular airbag 16 through the gas delivery pipe 15. As the gas is injected, the airbag 16 gradually expands, and its outer surface is uniformly attached to the cable intermediate joint body, dynamically filling the gaps caused by different diameters, irregular shapes or installation deviations. This achieves adaptive dynamic sealing of the cable intermediate joint area, breaking through the limitation of the traditional fixed sealing ring having high requirements for cable size matching, and effectively preventing the intrusion of external moisture, dust and corrosive gases.

[0025] Please see Figure 5 The first flame-retardant explosion-proof enclosure 1 and the second flame-retardant explosion-proof enclosure 2 are equipped with detectors 18 on their outer top surfaces for real-time monitoring of the operating status parameters inside the explosion-proof box. The first flame-retardant explosion-proof enclosure 1 and the second flame-retardant explosion-proof enclosure 2 are equipped with two intelligent warning devices 19 on their outer top surfaces. The intelligent warning devices 19 are located on the front and rear sides of the detectors 18. When the detectors 18 detect an abnormal state and reach a preset threshold, the intelligent warning devices 19 can flash lights and emit an alarm sound to provide immediate reminders, and upload the alarm signal to the operation and maintenance platform to realize remote monitoring and linkage response.

[0026] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made to the present invention without departing from the principles and spirit of the present invention as defined by the claims. Therefore, the detailed description of the embodiments in this disclosure is for explanation only and not for limiting the present invention, but rather the scope of protection is defined by the content of the claims.

Claims

1. A double-protection explosion-proof box for cable intermediate joints, comprising a first flame-retardant explosion-proof outer shell (1) and a second flame-retardant explosion-proof outer shell (2), wherein the first flame-retardant explosion-proof outer shell (1) and the second flame-retardant explosion-proof outer shell (2) are joined together by left and right connections to form a protective cavity, wherein an installation sleeve (3) is fitted onto one end of the first flame-retardant explosion-proof outer shell (1) and the second flame-retardant explosion-proof outer shell (2) that are far apart from each other, and a flame-retardant explosion-proof inner shell (4) is provided on the installation sleeve (3), wherein the flame-retardant explosion-proof inner shell (4) is located inside the outer shell and forms a double protection with the outer shell, characterized in that: The mounting sleeve (3) is provided with a plurality of insert rods (5) evenly spaced along the circumference. The first flame-retardant explosion-proof shell (1) and the second flame-retardant explosion-proof shell (2) are provided with a plurality of insertion holes that match the insert rods (5) at corresponding positions. The mounting sleeve (3) is provided with mounting slots (6) on both sides. The first flame-retardant explosion-proof shell (1) and the second flame-retardant explosion-proof shell (2) are fixedly provided with fixing plates (7) on the top. The fixing plates (7) are slidably provided with slide rods (8) on both sides. The bottom end of the slide rods (8) is provided with a locking block (9) that matches the mounting slots (6). An elastic element (10) is sleeved on the slide rods (8). The two ends of the elastic element (10) are fixedly connected to the slide rods (8) and the fixing plates (7) respectively.

2. The explosion-proof box for cable intermediate joints with dual protection as described in claim 1, characterized in that: Both sides of the card block (9) are designed as guide slope structures.

3. The explosion-proof box for cable intermediate joints with dual protection as described in claim 2, characterized in that: The inner ring of the mounting sleeve (3) is embedded with a limiting ring (11). The top of the first flame-retardant explosion-proof shell (1) and the second flame-retardant explosion-proof shell (2) are both provided with a placement cylinder (12). The limiting ring (11) is fixed with symmetrically distributed fixing seats (13). The fixing seats (13) are installed with a gas storage tank (14). The gas storage tank (14) is connected to one end of a gas transmission pipe (15) at the opening of the gas storage tank (14). The limiting ring (11) is provided with an air bladder (16). The air bladder (16) is connected to the gas transmission pipe (15). The gas transmission pipe (15) is installed with an air pump (17) at one end near the gas storage tank (14).

4. The explosion-proof cable joint box with dual protection as described in claim 3, characterized in that: The airbag (16) has an overall ring structure.

5. The explosion-proof cable joint box with dual protection as described in claim 4, characterized in that: The first flame-retardant and explosion-proof housing (1) and the second flame-retardant and explosion-proof housing (2) are provided with detectors (18) on their outer top surfaces.

6. The explosion-proof box for cable intermediate joints with dual protection as described in claim 5, characterized in that: Multiple intelligent warning devices (19) are provided on the top surface of the first flame-retardant and explosion-proof housing (1) and the second flame-retardant and explosion-proof housing (2), and the intelligent warning devices (19) are located on both sides of the detector (18).

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