Cable intermediate joint protection device applicable to extreme events

Abstract

The invention belongs to the technical field of cable connection, and particularly relates to a cable intermediate joint protection device applicable to extreme events, which comprises an upper shell, a lower shell, a secondary explosion-proof assembly and an arc extinguishing assembly, the upper shell and the lower shell are combined to form a main body shell structure, the secondary explosion-proof assembly and the arc extinguishing assembly are located in the main body shell structure, the secondary explosion-proof assembly is arranged in a central axis area of the main body shell structure, and the arc extinguishing assembly is located above the secondary explosion-proof assembly. Through the use of the secondary explosion-proof assembly, when deflagration occurs, quartz sand in a sealing rubber bag in the arc extinguishing assembly can be discharged to the outer side of the cable joint, so that the cable joint is not in contact with air, and the generation of explosion is hindered. The energy release hole upper cover sealing device plays a role in sealing the space and prevents liquid or sundries from entering the middle connector. The whole device achieves the effect of resisting extreme events.

Description

Technical Field

[0001] The present invention belongs to the technical field of cable connection, and particularly relates to a protection device for cable intermediate joints applicable to extreme events. Background Art

[0002] The laying of cable lines refers to the technical process of installing cables along the planned path. According to the differences in application scenarios, there are mainly five basic wiring modes: aerial erection, underground burial, underwater laying, wall fixing, and tunnel installation. Scientifically selecting the wiring scheme directly affects the signal transmission stability, the system's anti-risk ability, and the later maintenance efficiency. For the laying of cross-regional cable lines, considering the line protection requirements, the direct burial deep soil covering technology is usually adopted to isolate external interference; for the main lines in the core areas of cities, based on signal guarantee, convenient maintenance, and municipal planning requirements, a pre-constructed dedicated pipeline system is mostly selected for concealed laying. With the upgrade of smart city infrastructure, the integrated underground pipe network solution is gradually replacing the traditional wiring, which not only improves the urban appearance but also reduces the risk of accidental damage to the lines.

[0003] The cable joint protection device plays an important role in preventing the risk of explosion and combustion during the laying operation. The general technical solution is to pour a cured sealant at the joint to form a wrapping layer. Although this method can effectively isolate the conventional short-circuit sparks, it has a thermal stability defect: when the line is overloaded and generates abnormal high temperature, the colloidal material will melt and flow away, resulting in the exposed live conductor contacting oxygen, which may instead trigger a more serious secondary explosion and combustion accident. Under extreme events, the possibility of accidents increases, and it is difficult to form effective protection to prevent accidents. Some existing cable intermediate joint protection devices, in order to improve the airtightness of the device, choose not to adopt the design of energy discharge holes, such as the literature "Structural Design and Function Analysis of Pressurized Mode Cable Joint Explosion-Proof Boxes", but this design will cause the explosion and combustion to be more intense; or choose the design of energy discharge holes, but it will cause the airtightness of the device to deteriorate, and at the same time, oxygen will flow in when the explosion and combustion occur, such as the patent "An Explosion-Proof Box for Cable Intermediate Joints" (application number 202322385967.3). Summary of the Invention

[0004] To solve the above problems, the present invention provides a protection device for cable intermediate joints applicable to extreme events, focusing on solving the key defect of the existing technology that is prone to cause chain explosion and combustion accidents under abnormal working conditions (such as sudden overload or short circuit), and increasing the anti-risk ability under extreme events. The present invention conducts fire extinguishing and arc extinguishing treatment while discharging energy, and can effectively inhibit the development of explosion and combustion and the occurrence of secondary explosion and combustion.

[0005] The technical solution of the present invention is as follows:

[0006] A protection device for cable joints in the middle applicable to extreme events, comprising an upper housing 1, a lower housing 2, a secondary explosion-proof component 4 and an arc extinguishing component 5; the upper housing 1 and the lower housing 2 are combined to form a main housing structure, the secondary explosion-proof component 4 and the arc extinguishing component 5 are located inside the main housing structure, the secondary explosion-proof component 4 is arranged in the central axis area of the main housing structure, and the arc extinguishing component 5 is located above the secondary explosion-proof component 4.

[0007] The secondary explosion-proof component 4 includes a guide rod 41 and a joint housing 42. The guide rod 41 includes an upper rod 41a, a lower rod 41b and an energy-dissipating spring 41c; the joint housing 42 is a symmetric structure, including an upper joint housing and a lower joint housing. Grooves are provided on the upper joint housing and the lower joint housing to include the cable joint 61 therein. The cable 6 is located outside the groove, and a double-layer elastic sealing ring 62 is provided at the place where the cable 6 contacts the upper housing 1 and the lower housing 2; the guide rod 41 is fixed at both ends of the joint housing 42. Among them, the upper rod 41a is vertically fixed at both ends of the upper joint housing, the lower rod 41b is vertically fixed at both ends of the lower joint housing, and there are four energy-dissipating springs 41c in total. One end of each energy-dissipating spring 41c is respectively fixedly connected to the top end of the upper rod 41a or the bottom end of the lower rod 41b, and the other end is respectively fixedly connected to the inner wall of the upper housing 1 or the lower housing 2.

[0008] Two energy-dissipating holes 3 are provided on the upper housing 1, and the two energy-dissipating holes 3 are respectively located directly above the stress cones of the two middle joints; an energy-dissipating hole spring 32 is provided in the energy-dissipating hole 3. The energy-dissipating hole spring 32 is closely attached to the inner wall of the energy-dissipating hole 3. An energy-dissipating hole upper cover 31 is provided on the upper surface of the energy-dissipating hole 3. The top end of the energy-dissipating hole spring 32 is fixedly connected to the energy-dissipating hole upper cover 31, and the bottom end is fixedly connected to the inner wall of the energy-dissipating hole 3.

[0009] The arc extinguishing component 5 is composed of an arc extinguishing spring 51, an arc extinguishing blade 52 and a sealing rubber bag 53; a connecting plate is provided in the space inside the upper housing 1 and above the joint housing 42; two arc extinguishing springs 51 are respectively located in the two energy-dissipating holes 3. The top end of the arc extinguishing spring 51 is fixedly connected to the energy-dissipating hole upper cover 31, and the bottom end is fixedly connected to both ends of the connecting plate. The arc extinguishing blade 52 is fixed on the connecting plate; the sealing rubber bag 53 is fixed on the inner wall of the upper housing 1 and is located above the arc extinguishing blade 52.

[0010] Quartz sand is provided inside the sealing rubber bag 53.

[0011] For the double-layer elastic sealing ring 62, its outer layer is made of high-temperature resistant silicone rubber, and its inner layer is a memory metal ring.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] Through the use of the secondary explosion-proof component, when deflagration occurs, the quartz sand in the sealed plastic bag can be discharged to the outside of the cable joint, preventing the cable joint from coming into contact with air and hindering the occurrence of explosion. The sealing device of the upper cover of the energy discharge hole plays a role in sealing the space, preventing liquid or debris from entering the intermediate joint. The overall device realizes the function of resisting extreme events.

[0014] Compared with the prior art, the core breakthrough lies in the construction of a sealing-pressure release collaborative protection system. When the system detects abnormal working conditions, the dynamic sealing response module is immediately activated, injecting quartz sand into the dangerous area to block the further occurrence of deflagration. The pressure balance component adopts a dual-mode control strategy, maintaining an airtight protection interface under normal working conditions and intelligently opening the pressure relief channel in abnormal states to prevent liquid or debris from entering the intermediate joint. The overall device realizes the function of resisting extreme events. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a cable intermediate joint protection device applicable to extreme events of the present invention;

[0016] Figure 2 It is a schematic side view of a cable intermediate joint protection device applicable to extreme events of the present invention;

[0017] Figure 3 is Figure 2 a half-sectional view along A-A in

[0018] Figure 4 It is a schematic structural diagram of the secondary explosion-proof component;

[0019] Figure 5 It is a schematic structural diagram of the arc extinguishing component.

[0020] In the figure: 1 upper shell; 2 lower shell; 3 energy discharge hole; 4 secondary explosion-proof component; 5 arc extinguishing component; 6 cable;

[0021] 31 upper cover of the energy discharge hole; 32 energy discharge hole spring;

[0022] 41 guide rod; 41a upper rod; 41b lower rod; 41c energy discharge spring; 42 joint housing;

[0023] 51 arc extinguishing spring; 52 arc extinguishing blade; 53 sealed plastic bag;

[0024] 61 cable intermediate joint; 62 double-layer elastic sealing ring. DETAILED DESCRIPTION OF THE INVENTION

[0025] The following further describes the specific embodiments of the present invention in conjunction with the drawings and technical solutions.

[0026] As Figures 1-3As shown in the figure, a protection device for cable joints in the middle applicable to extreme events according to the present invention has a core of a split composite protection structure. The main structure is composed of an upper housing 1 and a lower housing 2, and the material is made of high-strength aluminum-magnesium alloy to improve the anti-explosion performance. A secondary explosion-proof component 4 and an arc extinguishing component 5 are also provided inside the main structure, which can effectively cope with the problem of multiple risk superposition under extreme working conditions. The secondary explosion-proof component 4 is arranged in the central axis area of the device, and the arc extinguishing component 5 is located above the secondary explosion-proof component 4.

[0027] Among them, the upper housing 1 and the lower housing 2 are quickly assembled through a distributed high-strength fastening component, which is convenient for fixing between the upper housing 1 and the lower housing 2, and allows precise adjustment of the pre-tightening force while ensuring the structural rigidity; the terminal of the joint interface is configured with an annular reinforcement structure, which effectively improves the anti-fatigue performance of the connection node under dynamic loads through the stress dispersion principle, and ensures the mechanical stability of the overall structure under dynamic working conditions.

[0028] Among them, the secondary explosion-proof component 4 includes a guide rod 41 and a joint housing 42. The guide rod 41 includes an upper rod 41a, a lower rod 41b and an energy-dissipating spring 41c; the joint housing 42 is a symmetric structure, including an upper joint housing and a lower joint housing. Grooves are provided on the upper joint housing and the lower joint housing, and the cable joint in the middle 61 is included in the groove. The cable 6 is located outside the groove, and a double-layer elastic sealing ring 62 is provided at the place where the cable 6 contacts the upper housing 1 and the lower housing 2; the guide rod 41 is fixed at both ends of the joint housing 42. Among them, the upper rod 41a is vertically fixed at both ends of the upper joint housing, and the lower rod 41b is vertically fixed at both ends of the lower joint housing. There are a total of four energy-dissipating springs 41c, one end of which is respectively fixedly connected to the top end of the upper rod 41a or the bottom end of the lower rod 41b, and the other end is respectively fixedly connected to the inner wall of the upper housing 1 or the lower housing 2. The secondary explosion-proof component 4 protects the cable joint in the middle. When an arc occurs and deflagration occurs, the secondary explosion-proof component 4 transmits the energy to the energy-dissipating spring 41c through the upper rod 41a and the lower rod 41b, reducing the direct impact of the deflagration on the upper housing 1 and the lower housing 2 of the cable joint protection device.

[0029] The double-layer elastic sealing ring 62 has a high-temperature-resistant silicone rubber on the outer layer and a shape memory metal ring on the inner layer, which expands at high temperature to enhance the sealing performance.

[0030] Among them, two energy-discharging holes 3 are formed in the upper shell 1, and the two energy-discharging holes 3 are respectively located directly above the stress cones of the two intermediate joints. An energy-discharging hole spring 32 is arranged in the energy-discharging hole 3. The energy-discharging hole spring 32 is in close contact with the inner wall of the energy-discharging hole 3. An upper cover 31 of the energy-discharging hole is arranged on the upper surface of the energy-discharging hole 3. The top end of the energy-discharging hole spring 32 is fixedly connected to the upper cover 31 of the energy-discharging hole, and the bottom end is fixedly connected to the inner wall of the energy-discharging hole 3. The energy-discharging hole spring 32 can reduce the stress damage of deflagration to the cable intermediate joint. The upper cover 31 of the energy-discharging hole forms a pressure-responsive sealing structure, and its core is the energy-discharging hole spring 32. Under normal operating conditions, the closed interface maintained by the pre-tightening force effectively guarantees the sealing performance of the equipment and significantly reduces the risk of penetration of environmental interference factors; when the system detects abnormal pressure fluctuations, the upper cover 31 of the energy-discharging hole opens to achieve precise opening and closing control of the pressure relief channel, forming a dual guarantee mechanism with both passive protection and active pressure relief functions.

[0031] Among them, the arc extinguishing assembly 5 is composed of an arc extinguishing spring 51, an arc extinguishing blade 52, and a sealing rubber bag 53. A connecting plate is arranged in the upper shell 1 in the space above the joint shell 42; the two arc extinguishing springs 51 are respectively arranged in the two energy-discharging holes 3. The top end of the arc extinguishing spring 51 is fixedly connected to the upper cover 31 of the energy-discharging hole, and the bottom end is fixedly connected to both ends of the connecting plate. The arc extinguishing blade 52 is fixed on the connecting plate; quartz sand is arranged inside the sealing rubber bag 53. The sealing rubber bag 53 is fixed on the inner wall of the upper shell 1 and is located above the arc extinguishing blade 52 to enhance the safety performance. The arc extinguishing assembly 5 is a mechanically responsive module. When deflagration occurs, the device automatically releases the stored quartz sand through a pressure trigger mechanism. It can effectively block the development of the electric arc and the spread of combustion and build a core blocking barrier in the safety protection system.

[0032] During use, the energy-discharging hole spring 32 is in a contracted state under normal working conditions. When a short circuit occurs in the cable intermediate joint, the electric arc causes deflagration, the temperature inside the device rises sharply, the air pressure increases greatly, and the pressure difference causes the upper cover 31 of the energy-discharging hole to be subjected to an upward stress, stretching the energy-discharging hole spring 32 and making the upper cover 31 of the energy-discharging hole in an open state. The inside of the device is converted from a closed state to an open state, discharging the pressure inside the device and suppressing the influence of deflagration on the cable intermediate joint. The upward movement of the upper cover 31 of the energy-discharging hole drives the arc extinguishing spring 51 to stretch, further driving the arc extinguishing blade 52 to rise, cutting the sealing rubber bag 53, and releasing the quartz sand inside the device to play a role in extinguishing fire and arc. The internal temperature rise causes the double-layer elastic sealing ring 62 to expand, suppressing the ejection of deflagration products to other parts of the cable.

[0033] Among them, the quartz sand inside the sealant bag 53 has the functions of extinguishing fire and insulating heat; the upper cover 31 of the energy discharge hole and the double-layer elastic sealing ring 62 seal the cable intermediate joint protection device to reduce the harm of liquid leakage; the upper shell 1, the lower shell 2 and the secondary explosion-proof component 4 increase the stress-bearing capacity of the overall structure; the energy discharge spring 41c in the guide rod 41 suppresses the influence of vibration on the overall structure. The above components enable the present invention to be applicable to working conditions under various extreme events.

Claims

1. A cable intermediate joint protection device suitable for extreme events, characterized in that: The cable intermediate joint protection device for extreme events comprises an upper shell (1), a lower shell (2), a secondary explosion-proof component (4) and an arc extinguishing component (5); the upper shell (1) and the lower shell (2) are combined to form a main shell structure, the secondary explosion-proof component (4) and the arc extinguishing component (5) are located inside the main shell structure, the secondary explosion-proof component (4) is arranged in the central axis area of ​​the main shell structure, and the arc extinguishing component (5) is located above the secondary explosion-proof component (4); The secondary explosion-proof assembly (4) comprises a guide rod (41) and a joint housing (42), wherein the guide rod (41) comprises an upper rod (41a), a lower rod (41b) and an energy release spring (41c); the joint housing (42) is a symmetrical structure, comprising an upper joint housing and a lower joint housing, wherein the upper joint housing and the lower joint housing are provided with grooves, wherein the cable intermediate joint (61) is included in the groove, and the cable (6) is located outside the groove, and the electrical contact with the upper housing (1) and the lower housing (2) is A double-layer elastic sealing ring (62) is provided at the cable (6); the guide rod (41) is fixed at both ends of the joint shell (42), wherein the upper rod (41a) is vertically fixed at both ends of the upper joint shell, and the lower rod (41b) is vertically fixed at both ends of the lower joint shell, and there are four energy release springs (41c), one end of which is fixedly connected to the top end of the upper rod (41a) or the bottom end of the lower rod (41b), and the other end is fixedly connected to the inner wall of the upper shell (1) or the lower shell (2); The upper shell (1) is provided with two energy-draining holes (3); an energy-draining hole spring (32) is provided in the energy-draining hole (3); the energy-draining hole spring (32) is closely attached to the inner wall of the energy-draining hole (3); an energy-draining hole upper cover (31) is provided on the upper surface of the energy-draining hole (3); the top end of the energy-draining hole spring (32) is fixedly connected to the energy-draining hole upper cover (31), and the bottom end is fixedly connected to the inner wall of the energy-draining hole (3); The arc extinguishing assembly (5) is composed of an arc extinguishing spring (51), an arc extinguishing blade (52), and a sealing rubber bag (53); a connecting plate is provided in the space inside the upper shell (1) and above the joint shell (42); the two arc extinguishing springs (51) are respectively located in the two energy discharge holes (3); the top end of the arc extinguishing spring (51) is fixedly connected to the upper cover (31) of the energy discharge hole, and the bottom end is fixedly connected to the two ends of the connecting plate. The arc extinguishing blade (52) is fixed on the connecting plate; the sealing rubber bag (53) is fixed on the inner wall of the upper shell (1) and is located above the arc extinguishing blade (52).

2. A cable intermediate joint protection device suitable for extreme events according to claim 1, characterized in that: The sealing plastic bag (53) is provided with quartz sand inside.

3. A cable intermediate joint protection device suitable for extreme events according to claim 1, characterized in that: The two energy release holes (3) are respectively located directly above the stress cones of the two middle joints.

4. A cable intermediate joint protection device suitable for extreme events according to claim 1, characterized in that: The double-layer elastic sealing ring (62) has an outer layer of silicone rubber and an inner layer of a memory metal ring.

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