An explosion-proof and moisture-proof integrated cable intermediate joint shell

Abstract

The utility model relates to power protection equipment technical field especially relates to an explosion -proof moisture -proof integrated cable intermediate joint shell, including first explosion -proof casing, the first explosion -proof casing is hinged through pivot and is provided with second explosion -proof casing. Through first explosion -proof casing and second explosion -proof casing constitute explosion -proof cavity, combine internal strengthening branch and fire -retardant pad structure, can effectively bear the instantaneous explosion pressure of internal electric arc fault and form dense heat -insulating layer, prevent flame and high -temperature gas exosmosis, improve whole explosion -proof reliability, in addition, the explosion -proof casing adopts the radial seal of the rubber sealing ring of two detachable ends to realize the different size cable to the radial seal of the part of wearing out, the first sealing strip of the shell inner chamber butt joint surface setting constitutes the inside main seal, the second sealing strip of outside joint provides the outside auxiliary seal, multistage collaborative sealing effectively blocks the moisture, humidity and dust invasion, improves the protection level.

Description

Technical Field

[0001] This utility model relates to the field of power protection equipment technology, and in particular to an explosion-proof and moisture-proof integrated cable intermediate joint shell. Background Technology

[0002] Cable joints are key components in power systems that connect two cable segments and enable power transmission. They are widely used in power transmission and distribution networks, petrochemicals, mining, rail transportation, and offshore platforms. Due to the complex insulation structure and concentrated electric field distribution at the joint, and its long-term operation in underground, humid, or high mechanical stress environments, its reliability directly affects the safe and stable operation of the entire cable line. To ensure the safe operation of cable joints under harsh conditions, external protection measures are usually required. Currently, the most common protection method is to use explosion-proof boxes made of metal for encapsulation and protection, which is mandatory, especially in explosive hazardous environments.

[0003] However, traditional explosion-proof boxes still have many technical defects in practical applications. Most traditional explosion-proof boxes rely solely on the mechanical strength of the shell itself to achieve explosion-proof function, but the shell does not have flame-retardant and heat-insulating materials or flame suppression structures inside. When a cable joint experiences a local arc or short circuit fault due to insulation deterioration, poor contact, or overvoltage, although the shell can withstand a certain pressure without breaking, the high-temperature plasma and flame inside may still spread through the joint or cable inlet, and cannot effectively suppress the combustion chain reaction, posing a risk of igniting the flammable environment outside the shell. The fire and explosion protection performance is incomplete. In addition, traditional explosion-proof boxes are mostly fixed sealed structures, and the size of the cable inlets at both ends is not adjustable, making it unable to adapt to cables of various diameters. Moreover, explosion-proof boxes often use tape to seal the cable inlets at both ends. This sealing method relies on manual operation, has poor consistency, and the materials used are easily affected by the environment, aging, hardening, shrinking, or cracking. After long-term operation, the seal fails, causing moisture and humidity to penetrate into the interior through the gap between the cable sheath and the shell.

[0004] Therefore, there is an urgent need to provide an explosion-proof and moisture-proof integrated cable joint shell. Utility Model Content

[0005] In order to overcome the shortcomings of existing explosion-proof cable joint boxes, such as lack of internal flame-retardant and explosion-proof measures, poor sealing compatibility and reliability, and susceptibility to moisture intrusion, this utility model provides an explosion-proof and moisture-proof integrated cable joint shell.

[0006] To address the aforementioned issues, this utility model employs the following technical solution: an explosion-proof and moisture-proof integrated cable intermediate joint shell, comprising a first explosion-proof shell, a second explosion-proof shell hinged to the first explosion-proof shell via a pivot, threaded holes symmetrically opened on the front sides of both the first and second explosion-proof shells, with first fixing bolts threaded into the threaded holes, a handle provided on the front side of the second explosion-proof shell, multiple reinforcing bars evenly spaced along the axial direction in the inner cavities of both the first and second explosion-proof shells, flame-retardant pads provided between adjacent reinforcing bars, first sealing strips provided on the mating surfaces of the inner cavities of both the first and second explosion-proof shells, second sealing strips provided at the external joint positions of both the first and second explosion-proof shells, slots opened at both ends of both the first and second explosion-proof shells, insertion plates inserted into the slots, and rubber sealing rings provided at the bottom of the insertion plates.

[0007] As a preferred embodiment of this utility model, damping rings are fitted at both ends of the rotating shaft and are fitted with the hinge gap between the first explosion-proof housing and the second explosion-proof housing.

[0008] As a preferred embodiment of this utility model, a damping strip is provided inside the slot.

[0009] As a preferred embodiment of this utility model, both the first explosion-proof housing and the second explosion-proof housing are fitted with anti-collision shells by second fixing bolts, and the outer surface of the anti-collision shells is provided with buffer pads.

[0010] As a preferred embodiment of this utility model, the operating end of the second fixing bolt is fitted with an anti-slip sleeve.

[0011] As a preferred embodiment of this utility model, the handle is covered with a rubber sleeve.

[0012] Compared with the prior art, the present invention has the following technical effects: 1. The explosion-proof cavity is formed by the first explosion-proof shell and the second explosion-proof shell. Combined with the internal reinforcing strip and flame-retardant pad structure, it can effectively withstand the instantaneous explosion pressure generated by the internal electric arc fault and form a dense heat insulation layer to prevent the leakage of flames and high-temperature gases, thereby improving the overall explosion-proof reliability. In addition, the explosion-proof shell uses rubber sealing rings that can be detached at both ends to achieve radial sealing of the cable exiting parts of different sizes. The first sealing strip set on the mating surface of the shell cavity constitutes the inner main seal, and the second sealing strip at the outer joint provides the outer auxiliary seal. The multi-level synergistic sealing effectively blocks the intrusion of moisture, humidity and dust, thereby improving the protection level.

[0013] 2. The external impact shield is securely installed on the outside of the explosion-proof shell by the second fixing bolt. Together with the surface buffer pad, it forms a rigid-flexible impact-resistant structure, which effectively absorbs and disperses external impact energy and prevents shell deformation and sealing failure. 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 sectional view of the first explosion-proof housing, the second explosion-proof housing, and the first fixing bolt, etc., of this utility model.

[0016] Figure 3 This is a partial cross-sectional view of the flame-retardant pad, plug plate, and rubber sealing ring components of this utility model.

[0017] Figure 4 This is a three-dimensional sectional view of the anti-collision shell, buffer pad, and second fixing bolt of this utility model.

[0018] Reference numerals: 1: First explosion-proof housing, 2: Rotating shaft, 3: Second explosion-proof housing, 4: Damping ring, 5: First fixing bolt, 6: Handle, 7: Reinforcing strip, 8: Flame-retardant pad, 9: First sealing strip, 10: Second sealing strip, 11: Connecting plate, 12: Rubber sealing ring, 13: Damping clip, 14: Anti-collision shell, 15: Buffer pad, 16: Second fixing bolt, 17: Anti-slip sleeve, 18: Rubber sleeve. Detailed Implementation

[0019] 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.

[0020] Example 1: Please refer to Figures 1-3An explosion-proof and moisture-proof integrated cable joint housing includes a first explosion-proof housing 1 and a second explosion-proof housing 3 hinged to the first explosion-proof housing 1 via a pivot 2. The second explosion-proof housing 3 can rotate relative to the first explosion-proof housing 1 around the pivot 2 to open or close, facilitating installation and maintenance. Damping rings 4 are fitted at both ends of the pivot 2, engaging with the hinge gap between the first explosion-proof housing 1 and the second explosion-proof housing 3. The frictional resistance generated by the damping rings 4 effectively controls the rotation speed of the second explosion-proof housing 3 during opening and closing, preventing damage from excessive speed or injury to operators. Both the first housing 1 and the second explosion-proof housing 3 have two symmetrically arranged threaded holes on their front sides. First fixing bolts 5 are threaded into these holes. When the two housings are closed, the corresponding threaded holes align, and the first fixing bolts 5 are screwed in to lock the structure, ensuring its overall sealing and mechanical strength. The second explosion-proof housing 3 has a handle 6 on its front side, covered with a rubber sleeve 18 to provide a good grip and comfort, and to effectively enhance hand friction and prevent slippage. The inner cavities of the first explosion-proof housing 1 and the second explosion-proof housing 3 are evenly spaced along the axial direction with six reinforcing bars 7, each with an arc-shaped structure, welded to the inner wall of the housing. The shell is either integrally formed or spliced ​​to enhance its compressive strength and impact resistance, preventing shell rupture in the event of an explosion caused by an internal arc fault. A flame-retardant pad 8 is provided between adjacent reinforcing strips 7. The flame-retardant pad 8 is made of a high-temperature resistant, self-extinguishing non-metallic composite material, capable of forming a dense carbonized layer under high-temperature or open-flame conditions, effectively suppressing flame propagation and improving overall explosion-proof performance. A first sealing strip 9 is provided on the mating surface of the inner cavities of both the first explosion-proof shell 1 and the second explosion-proof shell 3. The first sealing strip 9 is made of an elastic weather-resistant material. In the closed state, the first sealing strips 9 of the two shells press against each other to form an inner main sealing line. Both the outer seams of the first explosion-proof housing 1 and the second explosion-proof housing 3 are provided with second sealing strips 10 to form an outer auxiliary sealing structure, further improving the protection level of the whole machine and effectively preventing moisture and dust from entering. The first explosion-proof housing 1 and the second explosion-proof housing 3 are provided with slots at both ends. Insertion plates 11 are inserted into the slots. A rubber sealing ring 12 is provided at the bottom of the insertion plate 11. A damping strip 13 is provided inside the slot. When the insertion plate 11 slides into or out of the slot, the damping strip 13 generates a moderate friction force to prevent the insertion plate 11 from loosening or falling off due to vibration or external force, ensuring that it remains stable and fixed during operation.

[0021] When using this device, firstly, select a rubber sealing ring 12 of matching size according to the outer diameter of the cable to be connected. Then, slide the original connector plate 11 outwards and slide the new connector plate 11 into place along the slot, achieving quick replacement of the rubber sealing ring 12. Next, rotate and open the second explosion-proof housing 3, place the cable's intermediate connector inside the cavity of the first explosion-proof housing 1, adjust its position to be centered and avoid stress concentration areas, and close the second explosion-proof housing 3 so that it is completely fitted with the first explosion-proof housing 1. At this point, the first sealing strip 9 is compressed to form an airtight contact, sealing the gap between the housings. Finally, screw the first fixing bolt 5 into the aligned threaded hole for tightening. The rubber sealing rings 12 at both ends are radially compressed after the cable passes through, tightly covering the outer surface of the cable and effectively sealing the annular gap between the cable and the shell, preventing moisture from entering along the cable path. Thus, the rubber sealing rings 12 at both ends, the first sealing strip 9, and the second sealing strip 10 together form a three-level sealing system, completely blocking moisture and water vapor from entering the shell. Finally, the high-strength metal explosion-proof shell combined with the internal reinforcing strip 7 structure has sufficient pressure resistance to withstand the transient pressure impact generated by internal arc faults. At the same time, the flame-retardant pad 8 rapidly carbonizes and expands at high temperatures, limiting the spread of combustion and meeting the requirements for explosion-proof and flame-retardant properties.

[0022] Example 2: Based on Example 1, please refer to... Figure 4 Both the first explosion-proof housing 1 and the second explosion-proof housing 3 are equipped with anti-collision shells 14 by second fixing bolts 16. The anti-collision shells 14 are fixedly installed by the second fixing bolts 16 to form a detachable covering structure. This installation method not only ensures the stable connection of the anti-collision shells 14, but also facilitates later maintenance or replacement. The outer surface of the anti-collision shells 14 is provided with a buffer pad 15. The buffer pad 15 is made of elastic energy-absorbing material and has good impact resistance, weather resistance and aging resistance. The operating end of the second fixing bolt 16 is fitted with an anti-slip sleeve 17 to increase the friction of the operating part and prevent slippage.

[0023] When the explosion-proof enclosure is subjected to external mechanical impact, the outer buffer pad 15 first undergoes elastic deformation, absorbing and dissipating part of the impact energy. Subsequently, the impact shield 14 evenly distributes the remaining load to the entire enclosure structure, avoiding stress concentration that could lead to localized damage. This dual-layer protection mechanism significantly enhances the overall impact resistance of the enclosure, protects the integrity of the internal explosion-proof cavity, and maintains the effectiveness of the sealing system, thereby ensuring the structural safety and electrical reliability of the cable intermediate joint during transportation, installation, and long-term operation.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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. An explosion-proof and moisture-proof integrated cable intermediate joint housing, comprising a first explosion-proof housing (1), a second explosion-proof housing (3) hinged to the first explosion-proof housing (1) via a pivot (2), threaded holes symmetrically opened on the front sides of both the first explosion-proof housing (1) and the second explosion-proof housing (3), a first fixing bolt (5) threadedly disposed in the threaded holes, and a handle (6) disposed on the front side of the second explosion-proof housing (3), characterized in that: The inner cavities of the first explosion-proof housing (1) and the second explosion-proof housing (3) are provided with multiple reinforcing strips (7) evenly spaced along the axial direction. A flame-retardant pad (8) is provided between adjacent reinforcing strips (7). The mating surfaces of the inner cavities of the first explosion-proof housing (1) and the second explosion-proof housing (3) are provided with a first sealing strip (9). The outer seams of the first explosion-proof housing (1) and the second explosion-proof housing (3) are provided with a second sealing strip (10). The first explosion-proof housing (1) and the second explosion-proof housing (3) are provided with slots at both ends. A plug-in plate (11) is inserted into the slot. A rubber sealing ring (12) is provided at the bottom of the plug-in plate (11).

2. The explosion-proof and moisture-proof integrated cable joint housing according to claim 1, characterized in that: Damping rings (4) are fitted at both ends of the rotating shaft (2) and are fitted with the hinge gap between the first explosion-proof housing (1) and the second explosion-proof housing (3).

3. The explosion-proof and moisture-proof integrated cable joint housing according to claim 2, characterized in that: The slot is equipped with a damping strip (13).

4. The explosion-proof and moisture-proof integrated cable joint housing according to claim 3, characterized in that: Both the first explosion-proof housing (1) and the second explosion-proof housing (3) are fitted with anti-collision shells (14) by second fixing bolts (16), and the outer surface of the anti-collision shells (14) is provided with buffer pads (15).

5. The explosion-proof and moisture-proof integrated cable joint housing according to claim 4, characterized in that: The operating end of the second fixing bolt (16) is fitted with an anti-slip sleeve (17).

6. The explosion-proof and moisture-proof integrated cable joint housing according to claim 5, characterized in that: The handle (6) is covered with a rubber sleeve (18).

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