CN104967086B - An integral high-voltage cable explosion-proof joint box - Google Patents

Abstract

The present invention relates to a kind of Integral high-pressure cable explosion-proof connector box, safety in order to the high-voltage cable joint in cable passage under protecting field, the Explosion proof joint box includes cable bearer, it is arranged on integrally formed housing and the explosion-proof fire-extinguishing component being arranged on inside housing central section explosion-proof chamber on cable bearer, described housing is shuttle-type symmetrical structure, two ends open up cable aperture, seal is provided with described cable aperture, cable connector is additionally provided with inside described middle part explosion-proof chamber, described explosion-proof fire-extinguishing component is connected with cable connector, be additionally provided with described housing multiple connect with middle part explosion-proof chamber let out can hole guide pipe, described middle part explosion-proof chamber its complementary space internal all fills fire-proof and thermal-insulation fire proofing.Compared with prior art, the present invention has moistureproof, explosion-proof, fire prevention, safe and reliable, simple structure, low cost and other advantages.

Description

An integral high-voltage cable explosion-proof joint box

technical field

The invention relates to the field of electrical safety, in particular to an integral high-voltage cable explosion-proof joint box.

Background technique

As we all know, the cable intermediate joint is the weakest link of the cable. Our power system, power plant, nuclear power plant, petrochemical industry and other industries will inevitably use cable intermediate joints in the process of using cables, especially for large-section cables. According to this calculation, it is basically necessary to make a cable intermediate joint every 500 meters. If several cables are discharged together, it can be seen that there are too many intermediate joints in the cable, which just increases the potential safety hazard of the cable operation. Although the power system is well aware of this disadvantage, we are well aware of the high cost of 110kV and 220kV cables. The transformation of distribution network itself is to beautify the appearance of the city and improve the quality of safe operation of the power grid. Avoid personal injury or death accidents caused by people or animals touching exposed live parts or leakage. In the future, every city will have 110kV and 220kV high-voltage overhead lines go underground every year, and cable trenches and cable (sui) pipelines will be laid. Therefore, there will be more and more cables and cable intermediate joints in cable trenches and cable tunnels in the future, and cable intermediate joints are like "untimed bombs" as a potential safety hazard.

There are roughly two types of high-voltage cable accessories 110kV and 220kV cable intermediate joint accessories currently used in power systems, one is: domestic high-voltage power cable accessories. The other is: imported or joint venture high-voltage power cable accessories, and most of the accidents in the middle joint of the cable are as follows:

1. There are sundries piled up in the cable tunnel, too thick ash accumulation on the cable or cable support, flammable gas and flammable liquid leakage in the cable tunnel, etc., which are ignited by high temperature or open flame, and cable fire or explosion occurs;

2. The distance between the cable and the heat pipe is too close or the cable is overloaded for a long time, and the temperature is too high to age the insulating material, resulting in a decrease in insulation performance and breakdown and ignition;

3. The protective layer of the cable is damaged during cable laying or the cable insulation is mechanically damaged during operation, causing insulation breakdown between the phases of the cable and the outer layer;

4. In the 1980s and 1990s, when the oil-immersed cables were laid, the height difference was large, and oil dripping or oil leakage from the cable head occurred, resulting in the loss of insulating oil at the high-level cable end, and the thermal resistance increased, and the insulation coking caused breakdown and fire;

5. The cable intermediate joint is not crimped tightly, welded is not firm, and oxidation occurs during operation; the dosage of insulating material injected into the cable intermediate joint box does not meet the requirements, or there are air holes in the box when pouring; the cable box is poorly sealed or damaged cracks are immersed in moisture , so that insulation breakdown, fire and explosion;

6. The surface of the cable head is damp or polluted, the casing of the cable head is broken, and the distance between the lead wires is too small, which leads to flashover and fire;

7. The main insulation layer is damaged during the construction of cable accessories.

Contents of the invention

The object of the present invention is to provide an integral high-voltage cable explosion-proof splice box that is moisture-proof, explosion-proof, fire-proof, safe, reliable, simple in structure and low in cost in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

An integral high-voltage cable explosion-proof joint box, which is used to protect the safety of high-voltage cable joints in underground cable channels. Internal explosion-proof fire extinguishing components, the housing is a shuttle-shaped symmetrical structure, cable holes are provided at both ends, seals are provided at the cable holes, and cable connectors are also provided inside the central explosion-proof chamber. The explosion-proof fire extinguishing assembly is connected with the cable joint, and the shell is also provided with a plurality of energy-discharging hole guide pipes communicating with the central explosion-proof chamber, and the remaining space inside the central explosion-proof chamber is filled with fire-proof, heat-insulating and flame-retardant materials.

The explosion-proof fire extinguishing assembly includes an induction wire harness sleeved at both ends of the cable joint and an explosion-proof fire extinguisher connected with the induction wire harness. There are multiple explosion-proof fire extinguishers, which are respectively arranged at both ends of the middle explosion-proof chamber.

The inner wall of the central explosion-proof chamber is provided with a buffer flame-retardant layer and fire-proof auxiliary materials.

The guide tube of the energy release hole communicates with the explosion-proof chamber in the middle through the energy release hole provided on the shell, and the included angle between the guide tube of the energy release hole and the shell is 45-90 degrees.

An explosion-proof stainless steel ring is also sleeved on the outside of the housing, and the explosion-proof stainless steel ring is fixed by stainless steel screws.

A grounding hole is opened on the side of the housing, and the cable joint is connected to the cable bracket through the grounding hole through a waterproof grounding wire.

The material of the shell is aluminum-magnesium alloy.

Both ends of the housing are covered with joint hoops.

Compared with the prior art, the present invention has the following advantages:

1. The shell of the present invention is made of imported ship-grade environmentally friendly aluminum-magnesium alloy material, which is corrosion-resistant and strong.

2. The present invention is one-time production and molding without welding, waterproof, fireproof, explosion-proof, fully sealed, fully enclosed structure, and maintenance-free.

3. A 100mm wide energy release hole is reserved on the convex surface of the invention shell centered on both sides. According to the needs of the site, an external energy release hole guide tube can be connected to the energy release hole. The external energy release hole guide tube can be straight. It can also be oriented obliquely at 45°.

4. The present invention adopts the cable bracket to avoid the situation that the cable joint is often soaked in water, gets damp, and enters air.

5. The explosion-proof stainless steel ring in the middle part of the energy release chamber is assembled with explosion-proof stainless steel screws.

6. The casing of the present invention is equipped with a buffer flame-retardant layer and fire-proof auxiliary materials, which can absorb explosion energy and prevent fire.

7. When the cable joint breaks down and catches fire, the induction harness in the middle explosion-proof cavity senses an excessive current, which triggers the flameproof fire extinguisher to start to extinguish the fire in an instant, so that the flame is extinguished.

8. The buffer flame retardant layer has the effect that an open flame cannot be ignited. If the cable joint explodes, it will absorb part of the explosion impact force, which can play a role in shock absorption.

Description of drawings

Fig. 1 is a top view of the structure of the present invention.

Fig. 2 is a structural front view of the present invention.

Among them, 1. Shell, 11. Sealing member, 12. Energy release hole guide tube, 13. Grounding hole, 2. Cable connector, 21. Induction harness, 22. Explosion-proof fire extinguisher.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example:

As shown in Figures 1 and 2, an integral high-voltage cable explosion-proof joint box is used to protect the safety of high-voltage cable joints in underground cable channels. 1 and the explosion-proof fire extinguishing assembly arranged inside the explosion-proof chamber in the middle of the shell 1. The shell 1 is a shuttle-shaped symmetrical structure, with cable holes at both ends, and a seal 11 at the cable hole, and a cable joint 2 inside the explosion-proof chamber in the middle , the explosion-proof fire extinguishing assembly is connected with the cable joint 2, and the casing 1 is also provided with a plurality of energy-discharging hole guide pipes 12 communicating with the central explosion-proof cavity, and the rest of the space inside the central explosion-proof cavity is filled with fire-proof, heat-insulating and flame-retardant materials.

The explosion-proof fire extinguishing assembly includes an induction wire harness 21 sleeved at both ends of the cable joint 2 and an explosion-proof fire extinguisher 22 connected to the induction wire harness 21. There are multiple explosion-proof fire extinguishers 22, which are respectively arranged at both ends of the middle explosion-proof chamber and at the middle of the middle explosion-proof chamber. The inner wall is equipped with a buffer flame-retardant layer and fire-resistant auxiliary materials.

The guide tube 12 of the energy release hole communicates with the explosion-proof chamber in the middle through the energy release hole provided on the shell 1. The angle between the guide tube 12 of the energy release hole and the shell 1 is 90 degrees, and the shell 1 is also equipped with an explosion-proof Stainless steel ring, the explosion-proof stainless steel ring is fixed by stainless steel screws, there is a grounding hole 13 on the side of the housing 1, the cable connector 2 is connected to the cable bracket through the grounding hole 13 through the waterproof grounding wire, the material of the housing 1 is aluminum-magnesium alloy, the shell Both ends of the body 1 are provided with joint hoops.

The integral molding structure of the shell 1 is for the shell 1 to achieve a stronger overall anti-explosion impact force, bending resistance and tensile force, so that the cable joint 2 can always be kept in an ideal level state.

Claims (7)

1. An integral high-voltage cable explosion-proof joint box, used to protect the safety of the high-voltage cable joint in the underground cable channel, it is characterized in that the explosion-proof joint box includes a cable support, an integrally formed housing (1 ) and an explosion-proof fire extinguishing assembly arranged inside the explosion-proof cavity in the middle of the housing (1), the housing (1) is a shuttle-shaped symmetrical structure, and cable holes are provided at both ends, and a seal (11 ), the inside of the central explosion-proof chamber is also provided with a cable connector (2), the explosion-proof fire extinguishing assembly is connected with the cable connector (2), and the housing (1) is also provided with a plurality of connections with the central explosion-proof chamber Connected guide pipes (12) for energy release holes, the remaining space inside the central explosion-proof chamber is filled with fire-proof, heat-insulating and flame-retardant materials, and the explosion-proof fire extinguishing assembly includes induction wire harnesses (21) sleeved at both ends of the cable joint (2) ) and the explosion-proof fire extinguisher (22) connected with the induction harness (21), the described explosion-proof fire extinguisher (22) is provided with a plurality of, respectively arranged at the two ends of the explosion-proof chamber in the middle. 2. An integral high-voltage cable explosion-proof joint box according to claim 1, characterized in that, the inner wall of the middle explosion-proof chamber is provided with a buffer flame-retardant layer and fire-proof auxiliary materials. 3. An integral high-voltage cable explosion-proof joint box according to claim 1, characterized in that, the energy-discharging hole guide pipe (12) passes through the energy-discharging hole arranged on the housing (1) and the central explosion-proof The cavity is connected, and the included angle between the guide pipe (12) of the energy release hole and the casing (1) is 45-90 degrees. 4. An integral high-voltage cable explosion-proof joint box according to claim 1, characterized in that, the outer shell (1) is also covered with an explosion-proof stainless steel ring, and the explosion-proof stainless steel ring is fixed by stainless steel screws . 5. An integral high-voltage cable explosion-proof joint box according to claim 1, characterized in that, a grounding hole (13) is opened on the side of the housing (1), and the cable joint (2) is waterproof through Type ground wire passes ground hole (13) and is connected with cable support. 6. An integral high-voltage cable explosion-proof joint box according to claim 1, characterized in that, the material of the housing (1) is aluminum-magnesium alloy. 7. An integral high-voltage cable explosion-proof joint box according to claim 1, characterized in that, the two ends of the housing (1) are covered with joint hoops.