CN213846204U - Explosion-proof shell for cable intermediate joint and cable intermediate joint - Google Patents

Abstract

An explosion-proof housing for a cable intermediate joint and a cable intermediate joint, the explosion-proof housing for a cable intermediate joint comprising: the metal shell comprises a left shell, a right shell and an insulation connecting assembly for connecting the left shell and the right shell, and the metal shell is used for accommodating the middle joint body; the high-strength insulating inner container layer is arranged on the inner surfaces of the left shell and the right shell; the insulating layer is arranged on the outer surfaces of the left shell and the right shell; and the pressure relief valve is provided with a pressure relief hole and is arranged on the metal shell and communicated with the inside of the metal shell. The embodiment of the utility model provides a can prevent through high strength insulating inner bag layer that short-circuit current is direct to regard metal casing as the earthing terminal and melt through to can effectually block high-pressure impact. The influence of short-circuit current can be reduced through the metal shell, and meanwhile, the damage of internal explosion to external equipment is prevented. A good insulating effect can be provided by the insulating layer. The pressure can be released through the pressure release valve, and the power of explosion is reduced.

Description

Explosion-proof shell for cable intermediate joint and cable intermediate joint

Technical Field

The utility model belongs to high voltage power cable field, concretely relates to an explosion-proof shell and cable intermediate head for cable intermediate head.

Background

In recent years, the cabling application of urban power transmission and distribution lines in China has become a remarkable development trend, the cable intermediate connector is widely applied to the connection between cables in a power transmission system, the cable intermediate connector body is generally prefabricated and molded in a factory, the quality is easy to control, and the fault probability is low.

However, the field installation environment of the intermediate joint is complex and changeable, the overall quality of the joint is affected by various factors such as installation conditions, processes, materials and the quality of installation personnel, and the intermediate joint becomes a weak link of a cable line. In a tunnel for laying cables, due to the fact that space is narrow, barriers are multiple, combustibles in the cables are complex, the cables are dense, ventilation is poor, once an intermediate joint is broken down or exploded, a fire disaster is easily caused, high-temperature dense smoke is accumulated after fire is caught, a large amount of harmful gas is released, great difficulty is brought to fire extinguishing work, and the cables in a large area are easily damaged.

Traditional cable intermediate head protective housing adopts the structure of metal, realizes functions such as cable metallic shield recovery, metallic shield layer ground connection and explosion impact protection simultaneously, when the breakdown takes place, can't resist the high temperature impact of explosion, has taken place even melting of casing and has worn, can't effectively resist the explosion.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides an explosion-proof shell for cable intermediate head, an explosion-proof shell for cable intermediate head has solved the problem that cable intermediate head is difficult to effectively resist the explosion. The utility model also provides a cable intermediate head.

According to the utility model discloses an explosion-proof shell for cable intermediate head of first aspect embodiment, include: the metal shell comprises a left shell, a right shell and an insulation connecting assembly for connecting the left shell and the right shell, and is used for accommodating the middle joint body; the high-strength insulating inner container layer is arranged on the inner surfaces of the left shell and the right shell; the insulating layer is arranged on the outer surfaces of the left shell and the right shell; and the pressure relief valve is provided with a pressure relief hole and is arranged on the metal shell and communicated with the inside of the metal shell.

According to the utility model discloses an explosion-proof shell for cable intermediate head has following technological effect at least: the high-strength insulating inner container layer can prevent short-circuit current from directly melting through the metal shell as a grounding end, and can effectively block high-voltage impact. Can reduce short-circuit current's influence through metal casing, simultaneously because metal casing and glass fiber inner bag intensity are high, also can effectually prevent the injury of inside explosion to external equipment. The insulating layer wraps the surface of the metal shell, so that a good insulating effect can be provided. The basic pressure relief channel can be constructed through the pressure relief valve, and when breakdown or explosion and other accidents happen inside the explosion-proof shell for the cable middle joint, a large part of pressure can be released, so that the explosion power can be greatly reduced, and even directly and completely eliminated. In addition, can link together left casing and right casing through insulating coupling assembling, can avoid directly producing electric connection between left casing and the right casing for left casing and right casing can ground connection respectively.

According to some embodiments of the utility model, left side casing and right casing all adopt the copper shell.

According to some embodiments of the utility model, the insulating inner bag layer of high strength adopts glass fiber inner bag or aramid fiber combined material inner bag.

According to some embodiments of the utility model, be provided with rupture disk safety device in the relief valve.

According to some embodiments of the utility model, the relief valve has a plurality ofly, and is a plurality of the relief valve set up respectively in on left side casing and the right casing.

According to some embodiments of the present invention, the explosion-proof case for the cable intermediate connector further includes a metal flow guiding layer disposed on the outer surface of the intermediate connector body, the metal flow guiding layer has a cable passage allowing a cable to pass through, and the metal flow guiding layer is used for connecting the intermediate connector body with the metal shielding layers of the cables on both sides of the intermediate connector body; and two ends of the metal shell are connected with two ends of the metal flow guide layer.

According to some embodiments of the utility model, the metal water conservancy diversion layer adopts lead belt, copper strips, the mixed winding of copper mesh to form.

According to the utility model discloses cable intermediate head of second aspect embodiment, including foretell be used for cable intermediate head's explosion-proof shell and set up in an intermediate head body in the explosion-proof shell that is used for cable intermediate head.

According to the utility model discloses cable intermediate head has following technological effect at least: by adding the explosion-proof shell for the cable intermediate joint, the explosion power during explosion can be effectively reduced, and the damage to external equipment is reduced or even avoided. The explosion-proof shell for the cable intermediate head can also effectively release internal force, thereby reducing the influence of explosion impact force and further reducing the damage to external equipment.

According to some embodiments of the utility model, the intermediate head body with be used for packing between the explosion-proof shell of cable intermediate head and have quartz sand.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a front view of an embodiment of a second aspect of the invention;

fig. 2 is a longitudinal sectional view of an embodiment of the second aspect of the invention;

fig. 3 is a transverse cross-sectional view of an embodiment of a second aspect of the invention;

fig. 4 is an enlarged schematic view of a portion a of fig. 3.

Reference numerals:

a left shell 110, a right shell 120, an insulation connecting component 130,

200 portions of high-strength insulating inner container layer,

An insulating layer 300,

The pressure relief valve 400, the pressure relief hole 410, the rupture disk safety device 420, the lower flange 430, the upper flange 440, the sealing ring 450, the gas fire extinguishing device 460, the pressure relief valve,

A metal current-guiding layer 500,

An intermediate joint body 600,

And (3) quartz sand 700.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, if there are first, second, third, fourth, etc. described, it is only for the purpose of distinguishing technical features, and it is not understood that relative importance is indicated or implied or that the number of indicated technical features is implicitly indicated or that the precedence of the indicated technical features is implicitly indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solution.

An explosion-proof case for a cable intermediate joint according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 to 4.

According to the utility model discloses an explosion-proof shell for cable intermediate head, include: metal shell, high strength insulating inner bag layer 200, insulating layer 300, relief valve 400. A metal housing including left and right housings 110 and 120 for accommodating the middle joint body 600, and an insulating connection assembly 130 for connecting the left and right housings 110 and 120; a high-strength insulating inner container layer 200 disposed on the inner surfaces of the left and right cases 110 and 120; an insulating layer 300 disposed on outer surfaces of the left and right cases 110 and 120; and the relief valve 400 is provided with a relief hole 410, and the relief valve 400 is arranged on the metal shell and is communicated with the interior of the metal shell.

Referring to fig. 1 to 4, the high-strength insulating inner container layer 200 is made of a material with high strength and good insulating property, so that on one hand, short-circuit current can be prevented from directly melting through the metal shell as a ground terminal, and on the other hand, high-voltage impact can be blocked.

The metal shell is connected with the metal shielding layer of the cable, and then the grounding is completed through the metal shielding layer. The connection between the metal shell and the metal shielding layer can be completed by connecting the grounding wire. After the metal shell is grounded, when the internal middle connector body 600 or the cable breaks down, the short-circuit current is connected to the ground through the ground wire, and high temperature cannot be generated on the metal shell directly. Meanwhile, the metal shell is high in strength, when the interior explodes, the metal shell can also effectively block the explosion, and the influence of the internal impact force on external equipment is avoided. The insulating layer 300 is wrapped on the surface of the metal shell, which can provide a good insulating effect.

A pressure relief hole 410 is provided in the pressure relief valve 400, and the pressure inside can be directly and effectively relieved through the pressure relief hole 410. When an explosion occurs, the high-pressure gas can be released through the pressure relief valve 400, so that the influence of internal impact on external equipment is reduced or avoided.

According to the utility model discloses an explosion-proof shell for cable intermediate head can prevent through high strength insulation inner bag layer 200 that short-circuit current is direct to regard metal casing as the earthing terminal and melt through to can effectually block high-pressure impact. Can reduce short-circuit current's influence through metal casing, simultaneously because metal casing and glass fiber inner bag intensity are high, also can effectually prevent the injury of inside explosion to external equipment. The insulating layer 300 is wrapped on the surface of the metal shell, so that a good insulating effect can be provided. The pressure relief valve 400 can be used for constructing a basic pressure relief channel, and when breakdown or explosion and other accidents happen inside an explosion-proof shell for the cable intermediate joint, a large part of pressure can be released, so that the explosion power can be greatly reduced, and even directly and completely eliminated. In addition, the left casing 110 and the right casing 120 can be connected together through the insulating connection assembly 130, and the direct electrical connection between the left casing 110 and the right casing 120 can be avoided, so that the left casing 110 and the right casing 120 can be grounded respectively.

In some embodiments of the present invention, referring to fig. 1-3, the insulating connection assembly 130 includes an insulating member and a connection bolt. The first connecting through holes are formed in the side, which is required to be connected with the insulating part, of each of the left shell 110 and the right shell 120, the second connecting through holes corresponding to the connecting through holes in the left shell 110 and the right shell 120 are formed in the insulating part, and the first connecting through holes and the second connecting through holes are fixed through connecting bolts.

In some embodiments of the present invention, the left shell 110 and the right shell 120 are both copper shells. The copper shell has better conductivity and certain hardness, and can play a role in grounding diversion and preventing explosion impact.

In some embodiments of the present invention, the high-strength insulating liner layer 200 is made of a glass fiber liner or an aramid fiber composite liner. The glass fiber material and the aramid fiber composite material are high-strength materials, have good insulating property and can meet the protection requirement. In some embodiments of the utility model, the material that high strength insulating inner bag layer 200 used is glass fiber, and glass fiber is a high strength material, has good insulating properties simultaneously, can prevent on the one hand that short circuit current is direct to be regarded as the earthing terminal with metal casing and to melt through, and on the other hand can block high-pressure impact.

In some embodiments of the present invention, referring to fig. 1-3, a rupture disc safety device 420 is provided within the pressure relief valve 400. The rupture disk safety device 420 is arranged in the pressure release valve 400 and mainly can control the opening of the pressure release hole 410, when the middle joint body 600 and the cable are normal, the interior cannot be punctured or exploded, at the moment, the pressure is normal, and the rupture disk safety device 420 can prevent the communication between the pressure release hole 410 and the exterior; when the middle joint body 600 or the cable is broken down or exploded, high temperature and high pressure are generated inside the middle joint body, so that the rupture disk safety device 420 can be impacted, but when the pressure exceeds a preset pressure value, the rupture disk safety device 420 is broken, and the pressure relief hole 410 starts to relieve pressure.

In some embodiments of the present invention, referring to fig. 1-3, the pressure relief valve 400 includes a lower flange 430, an upper flange 440, and a sealing ring 450. The lower flange 430 is connected with the metal shell and communicated with the interior of the metal shell, the upper flange 440 and the lower flange 430 are connected through bolts, and the upper flange 440 and the lower flange 430 are sealed through a sealing ring 450. Rupture disk safety 420 snaps inside relief hole 410 of upper flange 440. When the pressure in the metal shell is too high, the rupture disk safety device 420 is impacted and broken, and the pressure is relieved through the pressure relief hole 410. The rupture disk safety device 420 has the advantages of low cost, sensitive action, large discharge area, simple maintenance and the like compared with a spring-type safety valve. The provision of the rupture disc safety device 420 in the upper flange 440 may facilitate replacement of the rupture disc safety device 420. If the integrated valve body structure is adopted, the operation is not easy when the rupture disk safety device 420 is replaced, or the whole valve body of the relief valve 400 needs to be replaced.

In some embodiments of the present invention, referring to fig. 3, a gas fire suppression device 460 is provided within the pressure relief valve 400. The gas fire-extinguishing device 460 can be activated when a breakdown or explosion occurs inside, effectively reducing the effect of high temperature. The gas fire extinguishing device 460 generally uses aerosol, which has good fire extinguishing effect at high temperature and can effectively reduce the oxygen concentration.

In some embodiments of the present invention, gas suppression apparatus 342 may be provided separately and independently from pressure relief valve 340. The separate valve body structure is arranged on the metal shell 302, and the gas fire extinguishing device 342 is arranged in the separate valve body structure, so that the fire extinguishing effect is better. A gas fire suppression device 342 may be disposed on the metal housing 302 on a side opposite the pressure relief valve 340.

In some embodiments of the present invention, referring to fig. 1 to 3, the pressure relief valve 400 is provided in a plurality, and the plurality of pressure relief valves 400 are respectively disposed on the left housing 110 and the right housing 120. The pressure relief speed can be increased by arranging the pressure relief valves 400, and the reaction can be more convenient and faster.

In some embodiments of the present invention, referring to fig. 2, the explosion-proof case for a cable intermediate connector further includes a metal flow guiding layer 500 disposed on an outer surface of the intermediate connector body 600, a cable channel allowing a cable to pass through is disposed in the metal flow guiding layer 500, and the metal flow guiding layer 500 is used for connecting the intermediate connector body with metal shielding layers of cables on two sides of the intermediate connector body; both ends of the metal case are connected to both ends of the metal current guiding layer 500. The metal current guiding layer 500 is overlapped on the metal shielding layers of the cables on two sides from the middle joint body 600, and then is connected to the grounding cable through the metal shielding layers, so that grounding is realized. When the intermediate joint body 600 or the cable is broken down, the arc breakdown channel of the traditional intermediate joint protective shell is from the wire core to the inner surface of the metal shell, and after improvement, the arc length of the breakdown channel can be reduced to be from the wire core to the inner surface layer of the metal current guiding layer 500; and the short-circuit current is grounded through the metal shielding layer, so that the energy value accumulated by the plasma is reduced. In addition, the metal shell can be grounded better through the metal current conducting layer 500, and the grounding wire is not needed to be connected to the metal shielding layer of the cable.

In some embodiments of the present invention, the metal current guiding layer 500 is formed by a mixture of lead tape, copper tape and copper mesh. The material formed by the mixed lapping and weaving has good hardness and conductivity, and can directly lead short-circuit current to a metal shielding layer of a cable, so that the short-circuit current is led to the ground, and the magnitude of energy gathering is effectively reduced.

In some embodiments of the present invention, the outer surface of the metal flow guiding layer 500 is further provided with a fire retardant belt and a fire retardant heat shrinkable tube. Fire-retardant area and fire-retardant pyrocondensation pipe can keep apart cable and outside air, prevent inside fire.

According to the utility model discloses cable intermediate head of second aspect embodiment, including foretell be used for the explosion-proof shell of cable intermediate head and set up the intermediate head body 600 in the explosion-proof shell that is used for cable intermediate head.

According to the utility model discloses cable intermediate head is used for cable intermediate head's explosion-proof shell through the increase, and the power of explosion when can effectual reduction explosion reduces the damage of avoiding external equipment even. The explosion-proof shell for the cable intermediate head can also effectively release internal force, thereby reducing the influence of explosion impact force and further reducing the damage to external equipment.

In some embodiments of the present invention, referring to fig. 2, quartz sand 700 is filled between the intermediate joint body 600 and the explosion-proof case for the cable intermediate joint.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and those skilled in the art can understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (8)

1. An explosion proof housing for a cable intermediate joint, comprising:

a metal housing including a left housing (110) and a right housing (120), and an insulating connection assembly (130) for connecting the left housing (110) and the right housing (120), the metal housing for accommodating the middle joint body (600);

a high-strength insulating inner container layer (200) provided on the inner surfaces of the left and right cases (110, 120);

an insulating layer (300) disposed on outer surfaces of the left and right cases (110, 120);

and the pressure relief valve (400) is provided with a pressure relief hole (410), and the pressure relief valve (400) is arranged on the metal shell and is communicated with the interior of the metal shell.

2. Explosion proof housing for cable intermediate joints according to claim 1, characterized in that the left housing (110) and the right housing (120) both employ copper housings.

3. The explosion-proof housing for the cable intermediate joint as recited in claim 1, characterized in that the high-strength insulating liner layer (200) employs a glass fiber liner or an aramid fiber composite liner.

4. Explosion proof housing for cable intermediate joints according to claim 1, characterized in that a rupture disc safety device (420) is provided inside the pressure relief valve (400).

5. The explosion-proof housing for the intermediate joint of electric cables as recited in claim 1, wherein said pressure relief valve (400) is plural, and plural pressure relief valves (400) are respectively provided on said left housing (110) and right housing (120).

6. The explosion proof housing for a cable intermediate joint according to claim 1, further comprising a metal flow guiding layer (500) disposed on an outer surface of the intermediate joint body (600), the metal flow guiding layer (500) having a cable passage therein for allowing a cable to pass therethrough, the metal flow guiding layer (500) being used for connecting the intermediate joint body with metal shielding layers of cables on both sides of the intermediate joint body; and two ends of the metal shell are connected with two ends of the metal flow guide layer (500).

7. The explosion-proof housing for the cable intermediate joint according to claim 6, wherein the metal flow guiding layer (500) is formed by winding and wrapping a mixture of lead strips, copper strips and copper meshes.

8. A cable intermediate joint, characterized by comprising the explosion-proof housing for a cable intermediate joint according to any one of claims 1 to 7 and an intermediate joint body (600) disposed inside the explosion-proof housing for a cable intermediate joint.

Images