CN110021907B

CN110021907B - 10KV cable joint protection device

Info

Publication number: CN110021907B
Application number: CN201910334242.7A
Authority: CN
Inventors: 戴文忠; 戴章; 吴钰娟; 戴超; 戴玉
Original assignee: Anhui Yifala Electrical Co ltd
Current assignee: Anhui yifala Electric Co.,Ltd.
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2020-04-17
Anticipated expiration: 2039-04-24
Also published as: CN110021907A

Abstract

The invention discloses a 10KV cable joint protection device which comprises an outer shell buried in the soil, a partition plate structure and an explosion suppression device, wherein the partition plate structure and the explosion suppression device are arranged in the outer shell, a cable connection cavity is arranged in the outer shell and is transversely divided into two cable containing cavities and a middle cavity positioned in the middle by the partition plate structure, the middle cavity is divided into an upper layer and a lower layer, the lower layer of the middle cavity is a joint protection box and is uniformly divided into a plurality of joint protection sub-chambers along the longitudinal direction, the upper layer of the middle cavity is an explosion-proof chamber, the joint protection cover is provided with sub-chamber openings which are communicated with the joint protection sub-chambers in a one-to-one correspondence mode, each sub-chamber opening is covered with a sub-chamber cover through a seam allowance structure, the explosion-proof box is installed at the bottom of the sub-chamber cover through a joint. According to the invention, the impact generated by explosion is effectively reduced through the explosion-proof chamber, and the damage of the cable joint to the joint protection chamber side wall and the damage to the adjacent cable joint are avoided.

Description

10KV cable joint protection device

Technical Field

The invention relates to a cable joint protection device, in particular to a 10KV cable joint protection device.

Background

High-voltage cables are generally long and often need to be laid in a segmented connection mode, and cables are connected at segmented connection positions by cable joints. Cable joints are a high point of failure, so protection must be taken for high voltage cable joints, with fewer cable joints being the better. For the protection of cable joints, underground cable wells are generally adopted for protection at present, and the underground cable wells are arranged at the cable joints, so that the protection of underground cables and the later maintenance and repair are facilitated.

When the cable well protects the cable joint, the cable joint is externally wrapped with an explosion-proof box, one side of the explosion-proof box is generally provided with a pressure relief hole, the explosion-proof box is closed and then an inner cavity in which the cable joint is arranged is filled with explosion-proof daub or epoxy resin, so that combustion caused by electric arc can be avoided, and the pressure relief hole is plugged by an energy-relief sealing plug made of rubber. Thus, the effects of moisture resistance, explosion resistance and fire resistance can be realized to a certain degree. When the temperature at the joint is too high, the expansion is triggered, the energy-discharging sealing plug is ejected out of the energy-discharging hole to discharge expanded fillers, and the instant explosion is avoided. Even so, the pressure that may be generated when the cable joint is overheated is higher than the tolerance of the explosion-proof box, even if the energy is leaked, the cable joint still explodes. Cable joints of a plurality of cables are sometimes arranged in an underground cable well to reduce maintenance time, other cables can be damaged if fragments generated by explosion of the cable joints occur, and the exploded cables lose the protection of an explosion-proof box and burn due to overheating, so that other cables are damaged in an extending manner, and more losses are caused.

Moreover, although there are explosion suppression devices for automatic fire extinguishing in the event of a fire due to a transmitted explosion, which generally employ an inductor provided at an explosion proof box as a start switch, the inductor and its connecting lines are susceptible to aging damage and electromagnetic interference, and thus reliability in long-term use is not guaranteed.

Disclosure of Invention

The invention aims to provide a 10KV cable joint protection device to solve the problem that in the prior art, a plurality of cable joints arranged in the same underground cable well can damage other cable joints due to explosion of one cable joint, so that damage is rapidly expanded.

The 10KV cable joint protection device comprises an explosion-proof box arranged outside each cable joint, wherein one side of the explosion-proof box is provided with a plurality of energy release holes, the cable joints are arranged in a plurality of numbers, in addition, the 10KV cable joint protection device also comprises an outer shell buried in the soil, a partition plate structure and an explosion suppression device, the partition plate structure and the explosion suppression device are arranged in the outer shell, a cable connection cavity is arranged in the outer shell, the cable connection cavity is transversely divided into a cable accommodating cavity at two ends and a middle cavity in the middle by the partition plate structure, the middle cavity is divided into an upper layer and a lower layer, the lower layer of the middle cavity is a joint protection box and is uniformly divided into a plurality of joint protection sub-chambers along the longitudinal direction, the upper layer of the middle cavity is an explosion-proof chamber, the explosion-proof chamber and the joint protection box are separated by a joint protection cover covering the top of the joint protection box, the joint protection cover is provided with sub-chamber, every divides the room opening to have covered a branch room lid through tang structure, divide room lid bottom to install through the joint link explosion-proof box, let out the ability hole down, explosion suppression device installs explosion-proof outdoor and explosion suppression agent quick-opening mechanism establish explosion-proof indoor, be equipped with on the explosion-proof room lateral wall and let out the explosion window.

Preferably, the explosion suppression device with connect the protection locellus one-to-one, a cable holds the intracavity and is equipped with to be fixed the explosion suppression agent mounting panel of explosion-proof outdoor side, the explosion suppression device include explosion suppression agent jar, explosion suppression pipeline and explosion suppression agent quick-opening mechanism, the explosion suppression agent jar is fixed on the explosion suppression agent mounting panel, explosion suppression agent quick-opening mechanism fixes and passes through at explosion-proof indoor side explosion suppression pipeline is connected to the export of explosion suppression agent jar, explosion suppression agent quick-opening mechanism bottom is pegged graft and is had the safety pin of start-up effect, the safety pin lower extreme is connected with the cable, the cable is walked around and is installed the fixed pulley of explosion-proof room lateral wall is connected to divide the room lid, divide the room to cover and be fixed with the spliced pole of connecting the cable.

Preferably, the explosion suppressant quick opening mechanism comprises a quick opening valve body, a piston, a plug rod, a glass ball, an upper through pipe, a lower through pipe and a pressure spring, a pipe interface connected with the explosion suppression pipeline is arranged on one side of the quick opening valve body, an explosion suppressant outlet and a piston port are arranged on the other side of the quick opening valve body, a communicating cavity communicated with the piston port is further arranged in the quick opening valve body, the lower through pipe is vertically arranged to be communicated with the pipe interface, the upper through pipe is positioned above the lower through pipe and separated from the lower through pipe through the glass ball, the upper end of the upper through pipe is communicated with the explosion suppressant outlet, the joint of the upper through pipe and the lower through pipe is positioned in the communicating cavity, a convex baffle ring is arranged on the inner side of the opening part of the piston port, the piston is in sliding fit with the piston port, the convex baffle ring is connected with the piston through the pressure spring, and the piston rod is fixed on the, the end part of the piston rod is pressed on the glass ball, the other side of the glass ball is abutted against the inner wall of the communicating cavity, and the safety pin penetrates through the quick-opening valve body and is inserted into the fixed insertion hole below the piston.

Preferably, the fixed jack orientation the lateral wall of spring part is the destructible lateral wall, piston side processing has towards one end terminal surface open-ended fixed slot, the destructible lateral wall is filled into the fixed formation of fixed slot joint, piston outside cover has the sealing washer, the sealing washer be located be connected with the terminal surface of piston rod with between the fixed jack.

Preferably, the partition structure divides the outer casing into three transverse cavities, wherein the transverse cavities are respectively provided with a side cavity at two sides and a cable connecting cavity at the middle, the side cavities are communicated with the drainage ditch through the drainage port, and the explosion venting windows are arranged at the left side and the right side of the explosion-proof chamber and are communicated with the side cavities after being broken.

Preferably, the bottom of the side cavity is provided with a transversely extending aqueduct connected to the water outlet, the side wall of each joint protection sub-chamber is provided with a water inlet communicated with the adjacent joint protection sub-chamber at the bottom, and the side cavity is also communicated with the adjacent joint protection sub-chamber through the water inlet.

Preferably, the cable holds the chamber and holds unnecessary cable, the cable holds the chamber and is close to be equipped with the waist type hole that corresponds with each joint protection locellus one-to-one on the lateral wall of joint protection locellus, the cable passes waist type hole gets into in the joint protection locellus, waist type hole upper and lower direction extends.

Preferably, the top of the cable accommodating cavity is covered with an accommodating cavity top cover, and the top of the explosion-proof chamber is covered with an explosion-proof cover.

The invention has the following advantages:

1. before explosion, the explosion-proof box of the cable joint usually firstly leaks energy from the energy leakage hole due to overheating and overlarge internal pressure, and the joint wrapped in the explosion-proof box can eject the explosion-proof box to rise to an explosion-proof chamber. If the explosion happens, the explosion-proof chamber has larger volume and can effectively reduce the impact generated by the explosion, and the phenomenon that the cable joint is exploded in the joint protection chamber with smaller volume, the joint is damaged to protect the side wall of the chamber, and the adjacent cable joint is damaged is avoided. Other cable joint can receive the protection through dividing the room lid when exploding in the explosion-proof room, avoid the influence that the explosion produced, even divide the room lid also to receive destruction, explosion-proof box also can drop downwards, avoids receiving the direct influence of piece and flame, divides the room lid to destroy and also can start corresponding explosion suppression device and avoid further causing conflagration or explosion.

2. The explosion suppressor quick-opening mechanism can release the locking of the safety pin when the chamber cover is lifted, and can be opened immediately by crushing the glass ball through the piston only by the impact generated by explosion, so that the opening is quick. And can prevent the explosion suppression device from opening by mistake through the safety pin at ordinary times, this kind of mechanical opening mechanism compares inductor opening mode and does not have the circuit electric wire, difficult ageing damage, and life is longer, is difficult for receiving electromagnetic interference, and the reliability is higher.

3. The explosion suppression devices in the device correspond to the explosion-proof boxes one by one, and when one chamber cover is lifted, the corresponding explosion suppression device is triggered to spray out the powder explosion suppression agent to prevent fire. This prevents the explosion suppressor of the explosion suppression device from being used up after an explosion of one cable joint and from failing to respond to the next explosion in a short time. And the explosion suppressant outlet faces to the position of each explosion-proof box respectively, so that the explosion source can be more accurately extinguished and prevented from explosion when explosion occurs.

4. The destructible side wall can ensure that the explosion suppression device can be automatically opened under the condition that the pressure reaches a certain degree during explosion when the safety pin starting mechanism is invalid. The side wall can be damaged when the pressure reaches the explosion venting pressure value of the explosion venting window by adjusting the strength of the clamping structure, namely, the side wall can be damaged automatically when the explosion impact force exceeds a safety range, the piston can move the crushing glass ball backwards, and the explosion suppression device is opened, so that the effect of failure prevention is achieved.

5. The explosion-proof box is fixedly suspended below the chamber dividing cover, so that the explosion-proof box is not easy to be stained on the protection box even if water leaks to the joint protection chamber, and a waterproof effect is achieved. The leaked water can be drained into an external drainage ditch through the water diversion port, the water diversion canal and the water outlet, and the water is prevented from accumulating in the joint protection sub-chamber. And meanwhile, the side cavity communicated with the outside can be used for further discharging energy to the outside after the explosion discharging window is damaged.

6. The cable that deposits unnecessary cable through setting up holds the chamber and connects the protection locellus to separate and can avoid connecting the direct harm of explosion and connect far away cable, and on the other hand makes when explosion-proof box lets let out the ability through waist type hole again, and unnecessary cable can let explosion-proof box freely rise, avoids the cable to receive the threat of hourglass and conflagration with pore wall wearing and tearing when the explosion, prevents that unnecessary cable from receiving.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a schematic structural view of the present invention after opening each top cover of the upper portions;

FIG. 4 is a right side view of the structure shown in FIG. 1;

FIG. 5 is a cross-sectional view taken in the direction A-A of the structure shown in FIG. 4;

FIG. 6 is a schematic view of the present invention with the baffle structure and the outer shell removed;

FIG. 7 is an enlarged fragmentary view of the suppressant quick-opening mechanism of the configuration shown in FIG. 6;

FIG. 8 is a schematic view of the interior of the quick opening valve body of the configuration of FIG. 7;

FIG. 9 is a schematic view of the piston of the arrangement of FIG. 8;

FIG. 10 is a schematic structural view of the structure shown in FIG. 9;

FIG. 11 is a schematic structural view of a diaphragm mechanism in the structure of FIG. 1;

FIG. 12 is a schematic view of the protective cover of the connector shown in FIG. 1;

fig. 13 is a schematic structural view of a sub-chamber cover with an explosion-proof box mounted therein in the structure shown in fig. 1.

The reference numbers in the above figures refer to:

1. an outer shell, 11, a water outlet, 2, a cable connecting cavity, 3, a cable containing cavity, 31, a containing cavity top cover, 32, an explosion suppressant mounting plate, 4, a joint protection box, 41, a joint protection cover, 411, a compartment opening, 42, a compartment cover, 421, a connecting column, 422, a joint connecting frame, 43, a joint protection compartment, 431, a kidney-shaped hole, 432, a water inlet, 5, an explosion proof compartment, 51, an explosion proof cover, 52, an explosion venting window, 53, a pulley mounting shaft, 531, a fixed pulley, 6, an explosion suppression device, 61, an explosion suppressant tank, 62, an explosion suppression pipeline, 63, an explosion suppressant quick opening mechanism, 631, an explosion suppressant outlet, 632, a piston port, 633, a safety pin, 634, a piston, 6341, a fixed slot, 6342, a breakable side wall, 6343, a sealing ring, 6344, a fixed slot, 6345, a clamping groove, 3646, a clamping bulge, 635, a pipe joint, 636, a glass ball, 637, an upper opening, 638, 637, a through pipe, lower siphunculus, 639, intercommunication chamber, 64, cable, 7, explosion-proof box, 71, earning hole, 8, cable, 9, side chamber, 91, aqueduct.

Detailed Description

The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.

Example 1:

as shown in fig. 1 to 12, the present invention provides a 10KV cable joint protection device in this embodiment, which includes an explosion-proof box 7 disposed outside each cable joint, wherein one side of the explosion-proof box 7 is provided with an energy-releasing hole 71, and the cable joint is provided with a plurality of cable joints. The 10KV cable joint protection device further comprises an outer shell 1 buried in the soil, a partition plate structure and an explosion suppression device 6 arranged in the outer shell 1.

The partition structure divides the outer shell 1 longitudinally into three transverse cavities, wherein the transverse cavities are provided with side cavities 9 at two sides and the cable connecting cavity 2 in the middle. Cable junction chamber 2 quilt the middle cavity that the cable that the baffle structure transversely divide into to be located both ends holds chamber 3 and is located the centre, middle cavity divide into two-layer from top to bottom, the lower floor of middle cavity is for connecting protection box 4 and along vertical evenly divided for a plurality of joint protection locellus 43, the upper strata of middle cavity is explosion-proof room 5, explosion-proof room 5 with connect and protect between the box 4 through the lid connect the joint visor 41 at protection box 4 top and separate.

Connect be equipped with on the visor 41 with connect the branch room opening 411 that the protection divides room 43 one-to-one intercommunication, every divides room opening 411 to have covered one through the tang structure and divides room cover 42, divides room opening 411 to be equipped with the female tang, divide the room cover below be equipped with the female tang of male tang complex, divide room cover 42 bottom to install through joint link 422 explosion-proof box 7, let out can hole 71 down, explosion suppression device 6 installs explosion-proof chamber 5 department, be equipped with explosion venting window 52 on the 5 lateral walls of explosion-proof chamber.

The lower part of the explosion-proof chamber 5, which is close to the inner wall of one side provided with the explosion suppression devices 6, is provided with a pulley mounting shaft 53, the pulley mounting shaft 53 horizontally and longitudinally extends and is rotatably provided with a plurality of fixed pulleys 531, and the fixed pulleys 531 correspond to the explosion suppression devices 6.

The explosion suppression device 6 and the joint protection branch chamber 43 are in one-to-one correspondence, an explosion suppression agent mounting plate 32 fixed on the outer side of the explosion suppression chamber 5 is arranged in one cable accommodating cavity 3, the explosion suppression device 6 comprises an explosion suppression agent tank 61, an explosion suppression pipeline 62 and an explosion suppression agent quick-opening mechanism 63, the explosion suppression agent tank 61 is fixed on the explosion suppression agent mounting plate 32, the explosion suppression agent quick-opening mechanism 63 is fixed on the inner side of the explosion suppression chamber 5 and is connected to an outlet of the explosion suppression agent tank 61 through the explosion suppression pipeline 62, a safety pin 633 with an opening function is inserted into the bottom of the explosion suppression agent quick-opening mechanism 63, the lower end of the safety pin 633 is connected with a stay cable 64, the stay cable 64 bypasses a fixed pulley 531 arranged on the side wall of the explosion suppression chamber 5 and is connected to the branch chamber cover 42, and a connecting column 421 connected with the stay cable 64 is fixed on the branch chamber cover 42.

The explosion suppressant quick opening mechanism 63 comprises a quick opening valve body, a piston 634, a piston rod, a glass ball 636, an upper through pipe 637, a lower through pipe 638 and a pressure spring, wherein one side of the quick opening valve body is provided with a pipe interface 635 connected with the explosion suppression pipeline 62, the other side of the quick opening valve body is provided with an explosion suppressant outlet 631 and a piston port 632, the quick opening valve body is further provided with a communication cavity 639 communicated with the piston port 632, the lower through pipe 638 is vertically arranged to be communicated with the pipe interface 635, the upper through pipe 637 is positioned above the lower through pipe 638 and separated from the lower through pipe 638 by the glass ball 636, the upper end of the upper through pipe 637 is communicated with the explosion suppressant outlet, the joint of the upper through pipe 637 and the lower through pipe 638 is positioned in the communication cavity 639, the inner side opening of the piston port 632 is provided with a protruding stop ring, the piston 634 is in sliding fit with the piston port 632, and the protruding stop ring is connected with the piston through the pressure spring, the piston rod is fixed on the inward end face of the piston 634, the end of the piston rod presses on the glass ball 636, the other side of the glass ball 636 abuts against the inner wall of the communication cavity 639, and the safety pin 633 passes through the quick-opening valve body and is inserted into a fixed insertion hole below the piston 634.

The side wall of the fixing insertion hole facing the spring portion is a breakable side wall 6342, one end face of the piston 634 is provided with a fixing groove 6344, the fixing groove 6344 is radially arranged near the outer edge of the end face and extends to the side face of the piston 634 to form a side opening, the bottom of the fixing groove 6344 is semicircular and is filled in the breakable side wall 6342. The breakable side wall 6342 is clamped and fixed after being filled into the fixing groove 6344, the outer end surface of the breakable side wall is flush with the end surface of the piston 634, and the end surface of the breakable side wall located in the fixing groove 6344 is a semicircular arc surface and forms the fixing slot 6341 with the bottom of the fixing groove 6344. And a sealing ring 6343 is sleeved outside the piston 634, and the sealing ring 6343 is located between the end face connected with the piston rod and the fixed insertion hole. Can destroy lateral wall 6342 both sides and be equipped with joint arch 6346, fixed slot 6344 inboard has with joint protruding 6346 complex joint recess 6345, and the two forms the joint structure. When the breakable side walls 6342 are pressed excessively, the catching protrusion 6346 is disengaged from the catching groove 6345, or the catching structure is damaged directly.

The side cavity 9 is communicated with a drainage ditch through a drainage port 11, and the explosion venting windows 52 are positioned at the left side and the right side of the explosion-proof chamber 5 and are communicated with the side cavity 9 after being broken. The bottom of the side cavity 9 is provided with a water guide channel 91 extending transversely, the water guide channel 91 is connected to the water discharge port 11, the side wall of each joint protection subchamber 43 is provided with a water guide port 432 communicated with the adjacent joint protection subchamber 43 at the bottom, the side cavity 9 is also communicated with the adjacent joint protection subchamber 43 through the water guide port 432, and a certain gap is formed between the explosion-proof box 7 and the bottom of the joint protection subchamber 43. The bottom of the joint protection sub-chamber 43 is arranged to be higher than the parts close to the aqueducts 91 on the two sides near the middle part of the middle chamber, when water seeps into the joint protection sub-chamber 43, the water flows to the two sides and finally flows to the aqueducts 91 on the two sides through the water inlets 432.

The cable holds chamber 3 and holds unnecessary cable 8, the cable holds chamber 3 and is close to be equipped with on the lateral wall of joint protection locuses 43 with each waist type hole 431 that connects protection locuses 43 one-to-one, the cable 8 passes waist type hole 431 gets into in the joint protection locuses 43, waist type hole 431 extends from top to bottom. The top of the cable accommodating cavity 3 is covered with an accommodating cavity top cover 31, and the top of the explosion-proof chamber 5 is covered with an explosion-proof cover 51.

The working process of the invention is as follows:

when the cable connector is initially connected, the cables 8 at the two ends are respectively inserted into the two cable accommodating cavities 3, and an operator inserts the cables 8 into the cable accommodating cavities 3 through the waist-shaped holes 431 and into the respective connector protection subchambers 43. Another operator operates on the top of the connector protection box 4, connects the connectors of the cables 8, and then protects the connected connectors by the explosion-proof box 7, covers the connector protection cover 41, and then takes out the explosion-proof box 7 from the compartment opening 411 of the explosion-proof box 7, and installs the explosion-proof box 7 at the bottom of the compartment cover 42 through the connector connection frame 422, and the compartment cover 42 is covered in the compartment opening 411 of the connector protection cover 41. Then, the guy cable 64 connected with the safety pin 633 is tied together with the connecting column 421 on the chamber cover 42 by bypassing the fixed pulley 531, and the valve of the explosion suppressant tank 61 is opened, so that the explosion suppressant in the explosion suppressant tank 61 flows to the lower pipe 638 of the explosion suppressant quick-opening mechanism 63 through the explosion suppressant pipeline 62 and is blocked by the glass ball 636. This enables the connection and setting of the cable connection and the preparation of the explosion suppression means 6 for activation. After the above operation is completed, the operator leaves and closes the housing chamber top cover 31 and the explosion-proof cover 51.

The explosion-proof principle of the invention is as follows:

when one cable joint is overheated, if the heat is small, the explosion-proof box 7 can not generate combustion and explosion. When the heat reaches a certain level, the expanded filler can be discharged through the energy discharge hole 71, and if the overheating is stopped at that point, the cable joint is still safe after the energy discharge, and the adjacent cable joint is not affected. If the heat reaches a high level and the pressure of the energy discharge is high, the explosion-proof box 7 and the sub-chamber cover 42 are pushed to rise, the sub-chamber cover 42 is lifted and the safety pin 633 is pulled out, so that the piston 634 is not blocked to move towards the glass ball 636, and the explosion suppression device 6 corresponding to the cable joint can open the explosion suppression agent quick-opening mechanism 63 by crushing the glass ball 636 at any time to enable the explosion suppression agent to be sprayed out from the explosion suppression agent outlet.

After the safety pin 633 is pulled out, if the high-pressure gas in the explosion-proof box 7 is exhausted, and the explosion-proof box 7 reaches a safety range without explosion, the explosion suppression device 6 cannot be triggered; if the high pressure gas is still under a high pressure after being exhausted and thus causes an explosion, the impact force generated by the explosion of the cable joint pushes the piston 634, thereby crushing the glass ball 636 through the piston rod. The high-pressure explosion suppressant is sprayed out from the explosion suppressant outlet through the communicating cavity 639, so that the fire extinguishing and explosion suppression effects are realized. When the explosion suppressant enters the communication cavity 639, the pressure in the communication cavity 639 is increased to push the piston 634, the piston 634 can be blocked by the raised retaining ring, the pressure spring 632 plays a role in buffering, and the sealing ring 6343 prevents the explosion suppressant from leaking.

Meanwhile, when the explosion-proof box 7 enters the explosion-proof chamber 5 from the joint protection subchamber 43, the volume is enlarged, so that compared with the situation that the explosion in the joint protection subchamber 43 generates a pressure reduction effect, the impact generated by the explosion is relatively small, and the side wall of the protection subchamber 43 is not easy to damage. This prevents the cable splice from exploding in the smaller volume splice protection subchamber 43 and damaging the side walls of the splice protection subchamber 43, causing damage to adjacent cable splices. Other cable joint can be protected through dividing room lid 42 when exploding in explosion-proof room 5, avoids the influence that the explosion produced, even divide room lid 42 also to receive destruction, explosion-proof box 7 also can drop downwards, avoids receiving the direct influence of piece and flame, divides room lid 42 to be destroyed and also can pull out corresponding safety pin 633 to the impact that produces through the explosion starts corresponding explosion suppression device 6 and avoids further causing conflagration or explosion.

When the explosion is strong enough, the explosion-proof chamber 5 can further discharge energy to the side cavities 9 on both sides through the explosion-discharge window 52, so as to reduce the impact of the explosion on the sub-chamber covers 42 corresponding to other cable joints, and the side cavities 9 communicated with the outside can also be used for further discharging energy to the outside after the explosion-discharge window 52 is damaged.

If the pulling rope 64 cannot be pulled out of the safety pin 633 due to human error or damage caused by long-term repair, the explosion suppression device 6 can be forcibly opened by destroying the side wall 6342. When the impact of the explosion reaches a predetermined magnitude, the pressure of the breakable side walls 6342 by the safety pins 633 is greater than the sustainable strength of the snap-fit structure, and the snap-fit structure is broken to allow the breakable side walls 6342 to disengage from the piston 634. In the scheme, the clamping structure strength of the side wall 6342 can be damaged, so that the side wall can be damaged when the pressure reaches the explosion venting pressure value of the explosion venting window 52, at the moment, the piston 634 is not blocked by the safety pin 633 and can press against the glass ball 636 under the action of impact force, the explosion suppression device 6 can be opened by crushing the glass ball 636 by the piston rod, the explosion suppression and fire extinguishing effects are achieved, and the safety of the cable 8 can be effectively protected.

Finally, the invention adopts the explosion-proof box 5 to be fixedly suspended below the sub-chamber cover 42, even if water leaks to the joint protection sub-chamber 43, the water is not easy to stick to the protection box 5, and the waterproof effect is achieved. The leaked water can be drained to an external drainage ditch through the water introduction port 432, the water introduction channel 91 and the water discharge port 11, preventing water from accumulating in the joint protection sub-chamber.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The invention is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the invention is not limited by the above-mentioned manner, and it is within the scope of the invention to adopt various insubstantial modifications of the inventive concept and solution of the invention, or to apply the inventive concept and solution directly to other applications without modification.

Claims

1. The utility model provides a 10KV cable joint protection device, includes establishes explosion-proof box (7) outside every cable joint, explosion-proof box (7) one side is equipped with lets out ability hole (71), the cable joint has a plurality ofly, its characterized in that: the explosion-proof device comprises an outer shell (1) buried in the soil, a partition plate structure and an explosion suppression device (6), wherein the partition plate structure and the explosion suppression device are arranged in the outer shell (1), a cable connection cavity (2) is arranged in the outer shell (1), the cable connection cavity (2) is transversely divided into a cable containing cavity (3) located at two ends and a middle cavity located in the middle by the partition plate structure, the middle cavity is divided into an upper layer and a lower layer, the lower layer of the middle cavity is a joint protection box (4) and is uniformly divided into a plurality of joint protection sub-chambers (43) along the longitudinal direction, the upper layer of the middle cavity is an explosion-proof chamber (5), the explosion-proof chamber (5) and the joint protection box (4) are separated by a joint protection cover (41) covering the top of the joint protection box (4), and sub-chamber openings (411) communicated with the joint protection sub-chambers (43) in a one-to-one, every divides room opening (411) to have covered one through tang structure and divides room cover (42), divide room cover (42) bottom to install through joint link (422) explosion-proof box (7), can let out hole (71) down, explosion suppression device (6) are installed outside explosion-proof room (5) and explosion suppression agent quick-opening mechanism (63) establish in explosion-proof room (5), be equipped with explosion venting window (52) on explosion-proof room (5) lateral wall.

2. A 10KV cable splice protection device according to claim 1, wherein: the explosion suppression device (6) is in one-to-one correspondence with the joint protection branch chambers (43), an explosion suppression agent mounting plate (32) fixed on the outer side of the explosion-proof chamber (5) is arranged in one cable accommodating cavity (3), the explosion suppression device (6) comprises an explosion suppression agent tank (61), an explosion suppression pipeline (62) and an explosion suppression agent quick-opening mechanism (63), the explosion suppression agent tank (61) is fixed on the explosion suppression agent mounting plate (32), the explosion suppression agent quick-opening mechanism (63) is fixed on the inner side of the explosion-proof chamber (5) and is connected to an outlet of the explosion suppression agent tank (61) through the explosion suppression pipeline (62), a safety pin (633) for starting is inserted into the bottom of the explosion suppression agent quick-opening mechanism (63), the lower end of the safety pin (633) is connected with a stay cable (64), and the stay cable (64) is connected to the branch chamber cover (42) by bypassing a fixed pulley (531) arranged on the side wall of the explosion-proof chamber (5), a connecting column (421) connected with the pull rope (64) is fixed on the sub-chamber cover (42).

3. A 10KV cable splice protection device according to claim 2, wherein: the explosion suppressant quick opening mechanism (63) comprises a quick opening valve body, a piston (634), a piston rod, a glass ball (636), an upper through pipe (637), a lower through pipe (638) and a pressure spring, wherein one side of the quick opening valve body is provided with a pipe interface (635) connected with an explosion suppression pipeline (62), the other side of the quick opening valve body is provided with an explosion suppressant outlet (631) and a piston port (632), a communicating cavity (639) communicated with the piston port (632) is further arranged in the quick opening valve body, the lower through pipe (638) is vertically arranged to be communicated with the pipe interface (635), the upper through pipe (637) is positioned above the lower through pipe (638) and separated from the lower through pipe (638) by the glass ball (636), the upper end of the upper through pipe (637) is communicated with the explosion suppressant outlet (631), and the joint of the upper through pipe (637) and the lower through pipe (638) is positioned in the communicating cavity (639), the oral area inboard of piston mouth (632) has protruding fender ring, piston (634) with piston mouth (632) sliding fit, protruding fender ring with pass through between piston (634) the pressure spring is connected, piston (634) terminal surface inwards is fixed with the piston rod, the piston rod tip is pressed on glass ball (636), glass ball (636) other side butt is in on the intercommunication chamber (639) inner wall, safety pin (633) pass the quick-opening valve body insert the fixed jack below piston (634).

4. A 10KV cable splice protection device according to claim 3, wherein: fixed jack orientation the lateral wall of pressure spring is for destroying lateral wall (6342), piston (634) side processing has towards one end terminal surface open-ended fixed slot (6344), can destroy lateral wall (6342) and fill in fixed slot (6344) fixed formation of joint fixed slot (6341), piston (634) outside cover has sealing washer (6343), sealing washer (6343) are located to be connected with the terminal surface of piston rod with between the fixed jack.

5. A10 KV cable splice protection device according to any one of claims 1 to 4, wherein: the baffle structure will shell body (1) vertically divide into three horizontal cavity, lie in both sides in the horizontal cavity be side chamber (9) and lie in the centre be cable junction chamber (2), side chamber (9) are through outlet (11) and escape canal intercommunication, let out and explode window (52) and be located explosion-proof room (5) left and right sides and break open the back with side chamber (9) intercommunication.

6. A10 KV cable splice protection device according to claim 5, wherein: the bottom of the side cavity (9) is provided with a transversely extending water guide channel (91), the water guide channel (91) is connected to the water outlet (11), the side wall of each joint protection sub-chamber (43) is provided with a water guide port (432) communicated with the adjacent joint protection sub-chamber (43) at the bottom, the side cavity (9) is also communicated with the adjacent joint protection sub-chamber (43) through the water guide port (432), and a certain gap is reserved between the explosion-proof box (7) and the bottom of the joint protection sub-chamber (43).

7. A10 KV cable splice protection device according to any one of claims 1 to 4, wherein: the cable holds chamber (3) and holds unnecessary cable (8), cable holds chamber (3) and is close to be equipped with waist type hole (431) with each joint protection locellus (43) one-to-one on the lateral wall of joint protection locellus (43), and cable (8) pass waist type hole (431) get into in the joint protection locellus (43), waist type hole (431) upper and lower direction is extended.

8. A 10KV cable splice protection device according to claim 7, wherein: the cable holds chamber (3) top and is covered and holds chamber top cap (31), explosion-proof lid (51) are covered on explosion-proof room (5) top.