CN105576596B - A new type of explosion-proof device for intermediate joints of cables - Google Patents

Abstract

A new explosion-proof device for intermediate joints of cables. Provided is a novel cable intermediate joint explosion-proof device with simple structure, convenient installation and improved safety. It includes a protection tube, an explosion-proof tube, a heat-shrinkable sealing cap, a pair of reinforcement components and a pair of heat-shrinkable sheaths. The explosion-proof tube communicates with the protection tube and is arranged at the center of the protection tube. The mouth of the explosion-proof pipe, a pair of reinforcement components are symmetrically arranged and located at the mouths of both ends of the protection tube, the reinforcement components are connected between the cable and the protection tube; a pair of heat shrinkable sheaths are respectively arranged on The nozzles at both ends of the protection tube, and the heat-shrinkable sheath are sleeved on the protection tube, the reinforcement component and the cable in sequence. The invention is convenient to process and has low cost.

Description

A new type of explosion-proof device for intermediate joints of cables

technical field

The invention relates to the field of electrical safety, in particular to an explosion-proof device for a cable intermediate joint.

Background technique

With the improvement of urban construction and development level, cable lines are more and more used in medium and low voltage power supply networks due to their excellent characteristics of reliable power supply and concealed laying. When the cable has a long power supply distance, cable connectors are often used for line connection. However, due to the influence of construction technology, operating environment and other factors, the intermediate joints of cables are more prone to failures, and 90% of cable failures are caused by intermediate joints. When an explosion occurs when the middle joint of the cable fails, there will be strong heat and impact, which will often burn out adjacent cables or cause safety hazards to the surrounding environment, causing secondary failures and causing greater losses.

Contents of the invention

Aiming at the above problems, the present invention provides a novel cable intermediate joint explosion-proof device with simple structure, convenient installation and improved safety.

The technical solution of the present invention is: comprising a protection tube, an explosion-proof tube, a heat-shrinkable sealing cap, a pair of reinforcing components and a pair of heat-shrinkable sheaths, the explosion-proof tube communicates with the protection tube and is arranged at the center of the protection tube, and the heat-shrinkable The shrink cap is set on the mouth of the explosion-proof tube,

A pair of reinforcement components are arranged symmetrically and located at the nozzles at both ends of the protection tube, and the reinforcement components are connected between the cable and the protection tube;

A pair of heat-shrinkable sheaths are respectively provided at the nozzles at both ends of the protective tube, and the heat-shrinkable sheaths are sheathed on the protective tube, the reinforcing component and the cable in turn.

The reinforcement assembly includes several inserts, the inserts are cones, and the several inserts are arranged on the cable in a ring shape, the cones of the inserts are located inside the protection tube, and the cone points are located at the inside of the protection tube. Externally, the cone tips of several inserts are connected and fixed by binding straps.

The reinforcement assembly includes a disk, several embedded columns and several blocks, the disk is sleeved on the cable, the disk is located outside the protection tube, and several blocks are arranged on the protection tube. On the inner wall of the pipe, a number of embedded columns are arranged on the disc, and the embedded columns correspond to the stoppers one by one. One end of the embedded column is hinged to the disc, and the other end is connected to the disc through a buckle structure. the block;

The buckle structure is as follows: the stud is provided with a clip head, the stopper is provided with a clip slot, and the clip head is adaptively arranged in the clip slot.

A sheath is also included, the sheath is sheathed on the post and the disc, and the sheath is located between the block and the post.

The reinforcement assembly includes a disk, several embedded columns and several threaded rods, the disk is sleeved on the cable, the disk is located outside the protective tube, and several embedded columns are fixed in a ring shape and evenly distributed Set on the disc, a number of embedded columns form a cylinder with a small outside and a large inside. The inner ends of the embedded columns are provided with support plates, and the support plates are provided with perforations. The threaded rods correspond to the The two ends of the threaded rod pass through the perforations of the braces on the braces of the pair of reinforcing components respectively, and nuts are arranged on the outer ends of the braces on the threaded rods.

The protection pipe and the explosion-proof pipe are respectively galvanized steel pipes.

The protection tube is provided with a grounding bolt.

The inner wall and the surface of the protection tube are respectively provided with flame retardant layers.

The binding tape is insulating tape.

In the present invention, the protective tube of the cable intermediate joint adopts galvanized steel pipe, and the explosion-proof tube (i.e., the energy release tube) is installed in the central part of the cable intermediate joint protective tube, which is the core part of the explosion energy generation; the processing is simple, and the galvanized steel pipe is sufficient for mechanical Strength, can effectively control the explosion energy, occupies less space in the cable well, does not affect the subsequent deployment of new cable lines, and is easy to operate and maintain.

The heat-shrinkable sleeve is heated and sealed at both ends of the protective tube, and the explosion-proof tube is heated and sealed with a heat-shrinkable cap; because the heat-shrinkable material has a certain grip when heated, the sealing effect is good, and it serves the purpose of waterproofing. When the joint explodes, the huge Explosion energy is easy to damage the sealing cap of the energy release tube and the protective tube sheath, and releases the explosion energy in a directional manner, which plays a role in control and facilitates fault finding.

The reinforcing component between the cable and the protective tube has the following functions: 1. The shaping effect is good, and it is used for the transition between the protective tube and the cable; 2. The reinforcing component has a gap, which is conducive to releasing energy during an explosion; 3. High strength, used to connect cables and protective tubes, reducing damage to adjacent cables.

The invention is convenient to process and has low cost.

Description of drawings

Fig. 1 is a structural representation of the present invention,

Fig. 2 is a schematic structural view of the first embodiment of the present invention,

Fig. 3 is the structural representation of the second embodiment in the present invention,

Fig. 4 is a schematic structural diagram of the optimized implementation of Fig. 3,

Fig. 5 is a partial enlarged view at M in Fig. 3,

Fig. 6 is a schematic structural view of a third embodiment of the present invention,

Fig. 7 is a partial enlarged view at N in Fig. 6;

In the figure, 1 is a protective tube, 2 is an explosion-proof tube, 3 is a heat shrinkable cap, 4 is a heat shrinkable sheath, 5 is a cable, 6 is a flame retardant layer, 7 is a reinforcing component, 71 is an insert, and 72 is a bundle Belt, 73 is a disc, 74 is a column, 75 is a block, 761 is a clamp, 762 is a slot, 77 is a threaded rod, 78 is a nut, and 79 is a support plate;

8 is sheath.

detailed description

As shown in Figures 1-7, the present invention includes a protection tube 1, an explosion-proof tube 2, a heat-shrinkable sealing cap 3, a pair of reinforcing components 7 and a pair of heat-shrinkable sheaths 4, and the explosion-proof tube 2 communicates with the protection tube 1 and Located at the center of the protection tube 1, the heat shrinkable sealing cap 3 is sleeved on the nozzle of the explosion-proof tube 2,

A pair of reinforcement components 7 are arranged symmetrically and are located at both ends of the protection tube 1, and the reinforcement components are connected between the cable 5 and the protection tube 1;

A pair of heat-shrinkable sheaths 4 are respectively provided at the nozzles at both ends of the protective tube, and the heat-shrinkable sheaths 4 are sheathed on the protective tube 1 , the reinforcing component 7 and the cable 5 in sequence.

During work, the cable 5 is passed through the protective tube. After the intermediate joint of the cable is made, the center of the protective tube is moved to the center of the intermediate joint of the cable. The two ends and the end of the explosion-proof tube are polished and smooth, and the two ends of the protection tube and the cable are wound with sealant, and then the heat-shrinkable sheath is heated and sealed, and the explosion-proof tube is sealed after heating with a heat-shrinkable sealing cap.

The advantages of the reinforcement component: it is used for the tapered transition between the protective tube and the cable, and the shaping effect is good, making the heat shrinkable sheath a smooth transition, avoiding damage, improving strength and service life; the reinforcement component has a gap that is conducive to explosion Time to release energy.

As shown in Figure 2, the first embodiment of the present invention is: the reinforcement assembly 7 includes several slugs 71, the slugs are cones, and the several slugs are arranged on the cable in a ring shape. The cone of the insert is located inside the protection tube, and the cone tip is located outside the protection tube. The cone tips of several inserts are connected and fixed by binding bands 72 .

During the work, use the fireproof board or insulating board to cut into cone-shaped inserts, and insert several inserts into the mouth of the protective tube, keep a certain distance between them, and then wrap them with binding tape to form a cone, and then insert the heat-shrinkable The sheath heat shrinks, creating a tapered smooth transition.

As shown in Figures 3-5, the second embodiment of the present invention is: the reinforcement assembly 7 includes a disk 73, several embedded columns 74 and several stoppers 75, and the disk 73 is sleeved on the cable 5, the disc is located outside the protection tube, several blocks are arranged on the inner wall of the protection tube, and several embedded columns are arranged on the disc, and the embedded columns 74 correspond to the corresponding The stopper 75, one end of the stud is hinged on the disc, and the other end is connected to the stopper through a buckle structure;

The buckle structure is as follows: a clamping head 761 is provided on the embedded post, a clamping groove 762 is provided on the stopper, and the clamping head is suitably arranged in the clamping groove.

During work, the disc is set on the cable, and the studs are connected to the stoppers one by one through the buckle structure, so that the cable can be "grasped" by the disc to reduce the further outward translation of the cable during the explosion and reduce the damage to adjacent cables.

A sheath 8 is also included, the sheath 8 is sheathed on the post and the disc, and the sheath is located between the block and the post. A sheath is provided, and the sheath is located in the protection tube, which further plays the role of reinforcement, forms the protection function of the inner sheath and the outer heat-shrinkable sheath, and plays the role of buffering the energy release transition during the explosion.

As shown in Figures 6-7, the third embodiment of the present invention is: the reinforcing assembly includes a disc 73, several embedded columns 74 and several threaded rods 77, and the disc 73 is sleeved on the cable , the disc is located outside the protection tube, and several embedded columns are annular and evenly distributed and fixed on the disc, and several embedded columns form a cylinder with a small outside and a large inside, and the inner ends of the embedded columns are arranged There is a support plate 79, and the support plate is provided with perforations, and the threaded rods 77 correspond to the embedded columns 74 one by one, and the two ends of the threaded rods respectively pass through the support plates on the embedded columns of a pair of reinforcement components 79, the threaded rod is provided with a nut 78 at the outer end of the support plate.

During work, the disk is set on the cable, and a threaded rod is set between a pair of support plates embedded in the column, so that the disks of a pair of reinforcement components are relatively fixed (that is, the cable intermediate joint forms a pair of cables into a whole) ), improve strength, and reduce damage to adjacent cables in the event of an explosion.

The protection pipe 1 and the explosion-proof pipe 2 are respectively galvanized steel pipes with high mechanical strength and reliable quality.

The protective tube 1 is provided with grounding bolts to facilitate the on-site installation of the protective tube.

The inner wall and the surface of the protection tube 1 are respectively provided with a flame retardant layer 6, which plays a role of flame retardant and improves safety.

The binding strip 72 is an insulating tape, which is convenient for bonding and easy and reliable to operate.

The present invention adopts the ground lead wire to be reliably connected to the ground net during work, and when a ground fault occurs, the ground resistance is low, the leakage is smooth, the ground current is large, and the signal is obvious, which is convenient for fault finding.

Using steel pipe, the body is firm. When the joint is repaired, only the sheath needs to be replaced and other parts can be reused; resources can be reused, and the loss is low.

After the reinforcement component is adopted in the present invention, the cable intermediate joint is fixed reliably in the protection tube, and the installation quality of the joint will not be affected by external force.

Claims (9)

1. A new type of cable intermediate joint explosion-proof device is characterized in that it includes a protection tube, an explosion-proof tube, a heat-shrinkable sealing cap, a pair of reinforcement components and a pair of heat-shrinkable sheaths, and the explosion-proof tube is connected to the protection tube and is located on the The center of the protection tube, the heat-shrinkable sealing cap is set on the nozzle of the explosion-proof tube, A pair of reinforcement components are arranged symmetrically and located at the nozzles at both ends of the protection tube, and the reinforcement components are connected between the cable and the protection tube; A pair of heat-shrinkable sheaths are respectively provided at the nozzles at both ends of the protective tube, and the heat-shrinkable sheaths are sheathed on the protective tube, the reinforcing component and the cable in turn. 2. A new type of cable intermediate joint explosion-proof device according to claim 1, characterized in that, the reinforcement assembly includes several inserts, the inserts are cones, and several inserts are arranged in a ring shape on the On the cable, the cone of the insert is located inside the protection tube, the cone tip is located outside the protection tube, and the cone tips of several inserts are connected and fixed by binding bands. 3. A new type of cable intermediate joint explosion-proof device according to claim 1, characterized in that, the reinforcement assembly includes a disk, several embedded columns and several stoppers, and the disk is sleeved on the cable , the disc is located outside the protection tube, a number of stoppers are arranged on the inner wall of the protection tube, a number of embedded columns are arranged on the disc, and the embedded columns correspond to the stoppers one by one , one end of the embedded column is hinged to the disc, and the other end is connected to the stopper through a buckle structure; The buckle structure is as follows: the stud is provided with a clip head, the stopper is provided with a clip slot, and the clip head is adaptively arranged in the clip slot. 4. A new type of cable intermediate joint explosion-proof device according to claim 3, characterized in that it also includes a sheath, the sheath is set on the embedded column and the disc, and the sheath is located on the stopper and between the studs. 5. A new type of cable intermediate joint explosion-proof device according to claim 1, characterized in that, the reinforcement assembly includes a disk, several embedded columns and several threaded rods, and the disk is sleeved on the cable , the disc is located outside the protection tube, and several embedded columns are annular and evenly distributed and fixed on the disc, and several embedded columns form a cylinder with a small outside and a large inside, and the inner ends of the embedded columns are arranged There is a support plate, the support plate is provided with perforations, the threaded rods correspond to the embedded columns one by one, and the two ends of the threaded rods respectively pass through the perforations of the support plates on the embedded columns of a pair of reinforcement components, A nut is arranged on the outer end of the support plate on the threaded rod. 6. A novel cable intermediate joint explosion-proof device according to claim 1, characterized in that, the protective tube and the explosion-proof tube are respectively galvanized steel pipes. 7. A new type of cable intermediate joint explosion-proof device according to claim 1, characterized in that, the protection tube is provided with a grounding bolt. 8. A new explosion-proof device for cable intermediate joints according to claim 1, characterized in that the inner wall and surface of the protective tube are respectively provided with flame-retardant layers. 9. A new explosion-proof device for cable intermediate joints according to claim 2, characterized in that the binding tape is an insulating tape.