An explosion-proof device for cable joints with an inspection structure

Abstract

This utility model relates to the field of power equipment safety protection technology, and in particular to an explosion-proof device for cable intermediate joints with an inspection structure. It includes an explosion-proof housing with an inspection port in the middle. Symmetrically distributed fixing seats are fixed to the outer wall of the explosion-proof housing, and a first guide rod is fixed between the front sides of two of the fixing seats. By embedding a high-strength transparent inspection plate into the symmetrically arranged arc-shaped protective cover, the operating status of the internal cable intermediate joint can be directly observed without opening the explosion-proof housing or requiring power outages. Furthermore, a dual-axis motor drives two unidirectional screws with opposite rotation directions to rotate synchronously, causing the protective cover to slide symmetrically along the guide rod, achieving automatic opening and closing of the inspection port. This structure replaces the traditional method of manually disassembling and assembling bolts or end caps, significantly shortening maintenance preparation time and reducing manual operation intensity.

Description

Technical Field

[0001] This utility model relates to the field of power equipment safety protection technology, and in particular to an explosion-proof device for cable intermediate joints with an inspection structure. Background Technology

[0002] Cable joints are key components in power systems that connect two cable segments to transmit electrical energy. They are widely used in important infrastructures such as urban power grids, rail transit, petrochemicals, and offshore wind power. Because they operate in high-voltage and high-current environments, the joints are prone to overheating, arcing, or even explosions due to insulation aging, poor contact, partial discharge, or installation defects. This not only affects the reliability of power supply but may also cause serious consequences such as fires and equipment damage. Therefore, in flammable, explosive, or high-safety-requirement locations, cable joints are usually placed in explosion-proof enclosures to limit the release of fault energy and prevent the accident from escalating.

[0003] Existing explosion-proof devices for cable joints mostly adopt a fully enclosed metal shell structure, which has good mechanical strength and explosion-proof performance. However, such devices generally have the problem of inconvenient operation and maintenance: in order to check the operating status of the joint, maintenance personnel must open the shell for manual inspection, which is cumbersome and poses safety risks. Frequent disassembly and assembly may also lead to aging of the seals, reducing explosion-proof performance and protection level. To alleviate the above problems, some devices are equipped with observation windows on the shell, but the existing observation structures are mostly fixed designs, which only support external observation from a limited perspective and cannot replace opening the cover for maintenance. When maintenance is required, manual removal is still necessary, and the operation is still cumbersome.

[0004] Therefore, there is an urgent need to provide a cable joint explosion-proof device that can both enable online visual monitoring of the status of cable joints and automatically open the maintenance channel when needed. Utility Model Content

[0005] In order to overcome the shortcomings of existing explosion-proof devices for cable joints, such as inconvenient operation and maintenance, frequent disassembly and assembly of the housing during inspection leading to decreased sealing performance, easy damage to explosion-proof integrity, and the inability of fixed observation windows to facilitate convenient maintenance, this utility model provides an explosion-proof device for cable joints that can achieve online visual monitoring of the status of cable joints and automatically open the maintenance channel when needed.

[0006] To address the aforementioned issues, this utility model employs the following technical solution: an explosion-proof cable joint device with an inspection structure, comprising an explosion-proof housing, an inspection port located in the middle of the explosion-proof housing, symmetrically distributed fixed seats fixedly mounted on the outer wall of the explosion-proof housing, a first guide rod fixedly connected between the front sides of two fixed seats, and a one-way screw rotatably mounted on the rear side of each of the two fixed seats, a dual-axis motor installed in the middle of the front outer wall of the explosion-proof housing, the two ends of the dual-axis motor being connected to the one-way screws on both sides via couplings, a symmetrically distributed arc-shaped protective cover covering the inspection port, a transparent inspection plate embedded in the arc-shaped protective cover, and sliders fixedly mounted on both the front and rear sides of the transparent inspection plate, the front slider having a through-hole structure, fitted onto the first guide rod and sliding along its axial direction, and the rear slider having an internal thread matching the corresponding one-way screw, forming a helical pair with the one-way screw.

[0007] In one embodiment, the curvature of the arc-shaped protective cover matches the contour of the outer wall of the explosion-proof housing.

[0008] In one embodiment, fixed clamping rings are fixedly provided at both ends of the explosion-proof housing, and symmetrically distributed second guide rods are fixedly connected to the fixed clamping rings. The second guide rods are slidably provided with movable clamping rings, and elastic elements are sleeved on the second guide rods. The two ends of the elastic elements are fixedly connected to the second guide rods and the movable clamping rings, respectively.

[0009] In one embodiment, the opposing clamping inner surfaces of the fixed clamping ring and the movable clamping ring are provided with rubber protective pads.

[0010] In one embodiment, a contact rod is fixed to the movable clamping ring.

[0011] In one embodiment, a guide plate is fixed to the slider, and the guide plate has a horizontally upward inclined structure. The inclined surface maintains sliding contact with the free end of the contact rod, forming a mechanical linkage relationship.

[0012] Compared with the prior art, the present invention has the following technical effects: 1. By embedding a high-strength transparent inspection plate on the symmetrically arranged arc-shaped protective cover, the operating status of the internal cable intermediate joint can be directly observed without opening the explosion-proof shell or shutting down the power. Furthermore, the dual-axis motor drives two unidirectional screws with opposite rotation directions to rotate synchronously, causing the protective cover to slide symmetrically along the guide rod, thereby realizing the automatic opening and closing of the inspection port. This structure replaces the traditional method of manually disassembling and assembling bolts or end covers, significantly shortening the maintenance preparation time and reducing the intensity of manual operation.

[0013] 2. The sliding clamping mechanism, consisting of a fixed clamping ring and a movable clamping ring, along with an elastic element, can adapt to the installation requirements of cables with different outer diameters. This ensures that the explosion-proof housing remains stable and fixed under vibration or external force, preventing axial movement. Furthermore, a guide plate with an inclined surface is set on the slider, which cooperates with the contact rod on the movable clamping ring to form a mechanical linkage mechanism. When the protective cover is opened, the guide plate pushes the contact rod, causing the movable clamping ring to overcome the elastic force of the elastic element and move upward, automatically releasing the cable. After the protective cover is closed, the elastic element resets and re-clamps the cable, providing ample operating space for connector disassembly and assembly, greatly improving the convenience of maintenance. 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 explosion-proof shell, arc-shaped protective cover, and transparent inspection panel of this utility model.

[0016] Figure 3 This is a three-dimensional structural diagram of the components of this utility model, including the first guide rod, the unidirectional screw, and the dual-axis motor.

[0017] Figure 4 This is a three-dimensional structural diagram of the components of this utility model, including the fixed clamping ring, the second guide rod, and the movable clamping ring.

[0018] Figure 5 This is a three-dimensional structural diagram of the rubber protective pad, contact rod, and guide plate components of this utility model.

[0019] Reference numerals: 1: Explosion-proof housing, 2: Fixing base, 3: First guide rod, 4: One-way screw, 5: Dual-axis motor, 6: Slider, 7: Arc-shaped protective cover, 8: Transparent inspection plate, 9: Fixing clamp, 10: Second guide rod, 11: Moving clamp, 12: Elastic element, 13: Rubber protective pad, 14: Contact rod, 15: Guide plate. 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 1-3An explosion-proof device for a cable joint with an inspection structure includes an explosion-proof housing 1. An inspection port is provided in the middle of the explosion-proof housing 1. Symmetrically distributed fixing seats 2 are fixedly mounted on the outer wall of the explosion-proof housing 1. A first guide rod 3 is fixedly connected between the front sides of the two fixing seats 2. One-way screws 4 are rotatably mounted on the rear sides of each of the two fixing seats 2. The two one-way screws 4 are symmetrically arranged, with opposite thread directions and their axes parallel to the first guide rods 3. A dual-axis motor 5 is installed in the middle of the front outer wall of the explosion-proof housing 1. The left and right ends of the dual-axis motor 5 are connected to the one-way screws 4 on the left and right sides respectively via couplings. When the dual-axis motor 5 is running, it can drive the two one-way screws 4 to rotate synchronously, and because their thread directions are opposite, symmetrical bidirectional movement can be achieved. The inspection port is covered with symmetrically distributed arc-shaped protective covers 7. The curvature of the arc-shaped protective cover 7 matches the outer contour of the explosion-proof housing 1 to ensure structural compactness and sealing. A transparent inspection plate 8 is embedded in the arc-shaped protective cover 7. The transparent inspection plate 8 is made of high-strength insulating transparent material and has good mechanical strength, weather resistance and electrical insulation performance. It is used to observe the operating status of the cable intermediate joint inside the explosion-proof housing 1 in real time. Slider 6 is fixed to both the front and rear sides of the transparent inspection plate 8. The slider 6 on the front side has a through hole structure, is sleeved on the first guide rod 3 and can slide along its axial direction to achieve linear guidance. The slider 6 on the rear side has an internal thread that matches the corresponding one-way screw 4 and forms a helical pair with the one-way screw 4 to achieve transmission function. In this way, when the one-way screw 4 rotates, the slider 6 on the rear side converts the rotational motion into linear motion, driving the entire protective cover to move back and forth along the guiding direction of the first guide rod 3.

[0022] Under normal operating conditions, the two protective covers are initially closed, touching or partially overlapping each other, completely covering the inspection port and forming a closed explosion-proof cavity. This ensures that the internal cable joints are in a safe and isolated environment. At this time, maintenance personnel can directly observe whether there are any abnormalities such as overheating, discharge, aging, or insulation damage in the internal joints through the transparent inspection plate 8 embedded in the protective cover. This enables non-contact inspection, improving maintenance efficiency and safety. When maintenance or replacement work is required, the dual-axis motor 5 is started. The motor's two output shafts synchronously drive two unidirectional screws 4 with opposite rotation directions to rotate in the same direction. Since the two screws rotate in opposite directions, together with the rear sliders 6 connected by their respective threads, the two protective covers will slide symmetrically outward along the direction guided by the first guide rod 3, thereby opening the inspection port and exposing the internal cable intermediate joint area, making it convenient for operators to perform inspection, maintenance, or replacement work. After maintenance is completed, the dual-axis motor 5 is controlled to rotate in the opposite direction, and the two unidirectional screws 4 rotate in the opposite direction, driving the two protective covers to slide symmetrically inward along the guide rod to close until they completely cover the inspection port, restoring the overall sealing structure of the explosion-proof housing 1.

[0023] Example 2: Based on Example 1, please refer to... Figure 4and Figure 5 The explosion-proof housing 1 has fixed clamping rings 9 at both its left and right ends. Second guide rods 10, symmetrically distributed front and rear, are fixedly connected to the fixed clamping rings 9. A movable clamping ring 11 is slidably mounted on each of the second guide rods 10. The movable clamping ring 11 can slide along the axial direction of the second guide rods 10, forming an openable and closable cable clamping mechanism together with the fixed clamping rings 9. An elastic element 12 is sleeved on each of the second guide rods 10. The upper and lower ends of the elastic element 12 are fixedly connected to the second guide rods 10 and the movable clamping ring 11, respectively, thereby applying a pre-tightening force towards the fixed clamping rings 9 to the movable clamping ring 11. Under the action of the elastic element 12, the movable clamping ring 11 and the fixed clamping ring 9 move closer together. The system forms a clamping state for the cable inserted therein. The inner surfaces of the fixed clamping ring 9 and the movable clamping ring 11 are both provided with rubber protective pads 13. The rubber protective pads 13 have good elasticity, wear resistance and electrical insulation properties, which can provide a buffering effect when clamping the cable, prevent the metal clamping ring from causing mechanical damage to the outer sheath of the cable, and at the same time enhance the clamping friction and improve the fixation reliability. A contact rod 14 is fixedly connected to the movable clamping ring 11, and a guide plate 15 is fixedly connected to the slider 6. The guide plate 15 is provided with a horizontally upward inclined structure. The inclined surface and the free end of the contact rod 14 maintain sliding contact and cooperate to form a mechanical linkage relationship.

[0024] When the device is operating normally and the protective cover is closed, the movable clamping ring 11, under the elastic force of the elastic element 12, tightly closes with the fixed clamping ring 9, firmly clamping the cable passing through the explosion-proof housing 1. The rubber protective pad 13 effectively protects the cable sheath from damage and prevents the device from moving along the cable axis due to vibration or external force, ensuring the explosion-proof housing 1 is installed stably. When maintenance is required, the dual-axis motor 5 is started, driving the two protective covers to slide outward along the guide rod to open the maintenance port. During this process, the guide plate 15 fixed on the slider 6 moves synchronously with the protective cover, and its inclined surface contacts the contact rod 14. As the protective cover continues to move outward, the inclined surface pushes the contact rod 14 upward, thereby driving the entire movable clamping ring 11 along the second guide rod. 10 slides upward, compressing the elastic element 12, increasing the clamping gap between the moving clamping ring 11 and the fixed clamping ring 9, thereby releasing the cable. This design allows the cable to be automatically released after the protective cover is opened to a certain stroke, providing operating space for subsequent joint disassembly, displacement adjustment or replacement operations, and avoiding the impact on maintenance convenience due to the cable being fixed too tightly. When maintenance is completed, the dual-axis motor 5 runs in reverse, driving the protective cover to slide inward and reset. At this time, the guide plate 15 moves in reverse with the slider 6, and its inclined surface gradually disengages from the contact rod 14. Under the restoring force of the elastic element 12, the moving clamping ring 11 resets downward along the second guide rod 10, re-closes with the fixed clamping ring 9, clamps the cable again, and restores the stable installation state of the explosion-proof housing 1.

[0025] Although the present invention has been described with reference to exemplary embodiments, it should be understood that the present invention is not limited to the disclosed exemplary embodiments. The scope of the following claims should be given the broadest interpretation in order to cover all variations and equivalent structures and functions.

Claims

1. An explosion-proof device for a cable joint with an inspection structure, comprising an explosion-proof housing (1), wherein an inspection port is provided in the middle of the explosion-proof housing (1), characterized in that, The explosion-proof housing (1) is fixedly provided with symmetrically distributed fixed seats (2) on its outer wall. A first guide rod (3) is fixedly connected between the front sides of the two fixed seats (2). A one-way screw (4) is rotatably provided on the rear side of the two fixed seats (2). A dual-axis motor (5) is installed in the middle of the front outer wall of the explosion-proof housing (1). The two ends of the dual-axis motor (5) are respectively connected to the one-way screws (4) on both sides through couplings. The inspection port is covered with symmetrically distributed arc-shaped protective covers (7). A transparent inspection plate (8) is embedded in the arc-shaped protective cover (7). A slider (6) is fixedly connected to both the front and rear sides of the transparent inspection plate (8). The slider (6) on the front side has a through hole structure, is sleeved on the first guide rod (3) and can slide along its axial direction. The slider (6) on the rear side has an internal thread that matches the corresponding one-way screw (4) and forms a helical pair with the one-way screw (4).

2. The explosion-proof device for a cable intermediate joint with an inspection structure according to claim 1, characterized in that, The curvature of the arc-shaped protective cover (7) matches the outer contour of the explosion-proof housing (1).

3. The explosion-proof device for a cable intermediate joint with an inspection structure according to claim 2, characterized in that, The explosion-proof housing (1) is fixedly provided with fixed clamping rings (9) at both ends. The fixed clamping rings (9) are fixedly connected with symmetrically distributed second guide rods (10). The second guide rods (10) are slidably provided with movable clamping rings (11). The second guide rods (10) are sleeved with elastic elements (12). The two ends of the elastic elements (12) are fixedly connected to the second guide rods (10) and the movable clamping rings (11) respectively.

4. The explosion-proof device for a cable intermediate joint with an inspection structure according to claim 3, characterized in that, The inner surfaces of the fixed clamping ring (9) and the movable clamping ring (11) are provided with rubber protective pads (13).

5. An explosion-proof device for a cable intermediate joint with an inspection structure according to claim 4, characterized in that, A contact rod (14) is fixedly connected to the movable clamp (11).

6. An explosion-proof device for a cable intermediate joint with an inspection structure according to claim 5, characterized in that, A guide plate (15) is fixedly connected to the slider (6). The guide plate (15) has a horizontally upward inclined structure. The inclined surface and the free end of the contact rod (14) maintain sliding contact and cooperate to form a mechanical linkage relationship.

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