Flexible explosion-proof device for 110 kilovolt and above cable joint

Abstract

The invention provides a flexible explosion-proof device for 110 kilovolt and above cable joints, and belongs to the technical field of explosion prevention of cable joints. Comprising an explosion-proof joint, a cable main body and an explosion-proof cover. According to the invention, by arranging two groups of anti-explosion joints which can be spliced, when an explosion risk exists, the temperature of a cable at the joints can be sharply increased due to high-voltage discharge, and when the temperature rises to the melting temperature of the temperature-sensing glass column, the temperature-sensing glass column can be heated and fractured, so that a plugging column at the bottom of the temperature-sensing glass column is jacked up by a spring II; at the moment, the liquid inlet groove is opened to enable the liquid outlet to be communicated with the liquid storage groove, that is, the air pressure in the liquid storage groove is unbalanced, and under the action of the first spring, the sliding plug can push liquid water in the liquid storage groove into the filler layer through the liquid outlet, so that the inorganic blocking material in the filler layer is rapidly solidified when meeting water to form a compact structure, and the explosion-proof and flame-retardant effects are achieved; the problems that an existing anti-explosion connector is high in use cost and maintenance cost are solved.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof technology for cable joints, and particularly to flexible explosion-proof devices for 110 kV and above cable joints. Background Technology

[0002] High-voltage cables of 110 kV and above serve as the core carriers for power transmission in urban power grids, industrial parks, and large energy bases. Their cable joints are critical weak points in the entire transmission line. These joints are often used in complex working conditions such as underground cable trenches, tunnels, and outdoor towers. They are subjected to drastic fluctuations in temperature and humidity, mechanical vibration, and high-voltage electric field impacts over long periods of time. They are also susceptible to the intrusion of external moisture and dust. Short circuits between phases or to ground caused by insulation aging, electric field distortion, and poor contact occur frequently. The high-temperature arc generated by the short circuit can easily ignite the surrounding medium, leading to an explosion, causing power transmission interruption, equipment damage, or even safety accidents. Therefore, explosion protection has become the core technical means for the protection of high-voltage cable joints.

[0003] Currently, cable joints are mostly designed with a splicing structure for easy on-site installation. They use mechanical clamping to fix the cable and have internal threaded explosion-proof surfaces so that the flame can be cooled to below the ignition temperature in the event of an explosion. At the same time, a high-strength metal shell is used to withstand the pressure generated by the internal explosion. Therefore, this type of joint must be installed tightly and the threaded explosion-proof surfaces must not be damaged. Moreover, this type of joint relies heavily on the material properties of the metal, resulting in high usage costs. In addition, joints need to be replaced regularly to prevent aging and loosening of the joint, which can cause internal gaps and compromise its explosion-proof performance. Therefore, this application provides a flexible explosion-proof device for 110 kV and above cable joints to meet the requirements. Summary of the Invention

[0004] The technical problem this invention aims to solve is to provide a flexible explosion-proof device for 110 kV and above cable joints. By setting two sets of interlocking explosion-proof joints, when there is an explosion risk, the cable at the joint will rapidly heat up due to high-voltage discharge. When the temperature rises to the melting temperature of the temperature-sensing glass column, the temperature-sensing glass column will crack due to heat, causing the bottom plug to be lifted by spring two. At this time, the liquid inlet is opened, causing the drain port to connect with the liquid storage tank, that is, the gas pressure inside the liquid storage tank is unbalanced. Under the action of spring one, the sliding plug can push the liquid water in the liquid storage tank into the packing layer through the drain port, so that the inorganic plugging material in the packing layer will quickly solidify upon contact with water, forming a dense structure, thereby achieving explosion-proof and flame-retardant effects, thus solving the problems of high use cost and high maintenance cost of existing explosion-proof joints.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A flexible explosion-proof device for 110 kV and above cable joints includes an explosion-proof joint, a cable body and an explosion-proof cover. The explosion-proof joint is provided in two sets and can be assembled with each other. The cable body is installed inside the explosion-proof joint. The explosion-proof cover is provided in two sets and is sealed at the connection of the two sets of explosion-proof joints. The explosion-proof joint is composed of an inner core assembly, an outer outer assembly and a rear sleeve. The inner core assembly includes a core cylinder. A flexible semi-splitter outer sleeve is fixedly installed on the front wall of the core cylinder. Two sets of flexible semi-splitter outer sleeves are symmetrically arranged and can be inserted into each other. Both the flexible semi-splitter outer sleeve and the inner wall of the core cylinder are provided with a filler layer, and inorganic plugging material can be filled in the filler layer. A drain port is provided at the top of the core cylinder and is connected to the inside of the filler layer. A core-running groove is provided on the inner wall of the middle part of the core cylinder, and the cable in the cable body can pass through the core-running groove. A stress cone groove is provided on the inner wall of the end of the core cylinder and is connected to the core-running groove. An inner liner is snapped onto the end wall of the core cylinder.

[0006] Optionally, the outer sleeve assembly includes a front sleeve, the inner wall of which is inserted into the outer wall of the front end of the core cylinder. A liquid storage tank is formed in the inner wall of the front end of the front sleeve, and the liquid storage tank is filled with liquid water. A sealing end cap is sealed and fixed to the front end wall of the front sleeve, and the sealing end cap can seal the liquid storage tank. A spring is provided in the liquid storage tank, and the front end of the spring is fixedly connected to the cover wall of the sealing end cap. A sliding plug is fixedly installed at the other end of the spring, and the sliding plug is slidably connected to the inner wall of the liquid storage tank. A trigger groove is formed in the inner wall of the top of the front sleeve, and a trigger structure is provided in the trigger groove. The bottom of the trigger groove is connected to the drain port. A one-way injection port is formed in the top of the front sleeve, and the one-way injection port is connected to the inside of the liquid storage tank.

[0007] Optionally, the triggering structure includes a positioning cylinder, which is fixedly connected to the inner wall of the triggering groove. Three sets of liquid inlet grooves are evenly opened on the side wall of the positioning cylinder located in the liquid storage tank. A cross base is fixedly installed on the bottom inner wall of the positioning cylinder. A second spring is fixedly installed on the top of the cross base. A plug is fixedly installed on the top of the second spring. Both the second spring and the first spring are in a compressed state. A temperature-sensing glass column is fixedly installed on the top inner wall of the positioning cylinder. The bottom of the temperature-sensing glass column is in contact with the top of the plug. The plug is used in conjunction with the liquid inlet groove.

[0008] Optionally, the rear sleeve is inserted into the outer wall of the end of the core cylinder, a sealing ring is installed on the inner wall of the end of the rear sleeve, a moisture-proof shell is fixedly installed on the end wall of the rear sleeve, and sliding rings are slidably installed on the inner walls of both ends of the moisture-proof shell. A spring is provided between the two sets of sliding rings, and the two ends of the spring are fixedly connected to the end walls of the two sets of sliding rings respectively, and the spring is in a compressed state. An end cap is threadedly engaged on the end wall of the moisture-proof shell.

[0009] Optionally, the cable body passes through two sets of slip rings and is in sealing contact with the inner wall of the sealing ring. The end wall of the cable body contacts the end wall of the inner liner, and a stripping installation operation is performed at the contact point. A stress cone is engaged in the inner wall of the stress cone groove, and the cable passes through the stress cone and the core groove.

[0010] Optionally, the two sets of flexible semi-splitting outer jackets are equipped with inner limiting blocks inside. The outer side of the inner limiting blocks is provided with connectors, and different cables can be spliced ​​through the connectors. The outer side of the connectors is provided with protective covers, and the protective covers, connectors and inner limiting blocks can be fixedly connected by bolts.

[0011] Optionally, the two sets of explosion-proof covers are fixedly connected to the top and bottom end walls of the core cylinder, and a sealed cavity can be formed between the outer sides of the two sets of core cylinders. The top of the explosion-proof cover is provided with a one-way gas injection port, and helium can be injected into the formed sealed cavity through the one-way gas injection port.

[0012] Compared with the prior art, the present invention has at least the following beneficial effects:

[0013] In the above scheme, by setting two sets of interlocking explosion-proof joints, when there is an explosion risk, the cable at the joint will heat up rapidly due to high-voltage discharge. When the temperature rises to the melting temperature of the heat-sensing glass column, the heat-sensing glass column will crack due to heat, causing the bottom plug to be lifted by spring two. At this time, the liquid inlet is opened, causing the drain port to connect with the storage tank. That is, the gas pressure inside the storage tank is unbalanced. Under the action of spring one, the sliding plug can push the liquid water in the storage tank into the packing layer through the drain port, so that the inorganic plugging material in the packing layer will quickly solidify upon contact with water, forming a dense structure, thereby achieving explosion-proof and flame-retardant effects without repeated maintenance.

[0014] By setting up two explosion-proof measures, namely inorganic plugging material and helium gas plugging, the inorganic plugging material can absorb the first wave of explosion risk when an explosion hazard occurs. Subsequently, the helium gas achieves flame retardancy and explosion prevention by inert asphyxiation, isolating oxygen, and diluting flammable gases. At the same time, it has electrical insulation properties and can also buffer the explosion pressure. The dual explosion-proof mechanism greatly improves the reliability of protection. Attached Figure Description

[0015] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0016] Figure 1 A three-dimensional structural diagram of a flexible explosion-proof device for 110 kV and above cable joints; Figure 2 This is an assembly diagram of two sets of explosion-proof covers and explosion-proof connectors; Figure 3This is a schematic diagram of the assembly of two sets of explosion-proof connectors; Figure 4 A bottom view of the assembly of two sets of explosion-proof connectors; Figure 5 This is a schematic diagram of the assembly of the moisture-proof shell and the rear sleeve; Figure 6 This is a half-sectional view of the rear sleeve; Figure 7 This is a schematic diagram of the assembly of the cable body and the rear sleeve; Figure 8 This is a schematic diagram of the assembly of the core tube and the front sleeve; Figure 9 This is a schematic diagram of the inner core assembly. Figure 10 This is a half-sectional view of the core cylinder; Figure 11 This is a structural diagram of the outer casing component; Figure 12 This is a schematic diagram of the assembly of the inner sealing end cap, spring 1, and slide plug of the outer casing assembly; Figure 13 Diagram showing the positions of the sealing end cap, spring 1, and sliding plug inside the front sleeve; Figure 14 This is a half-sectional view of the front sleeve; Figure 15 This is a schematic diagram of the trigger structure; Figure 16 This is a schematic diagram of the assembly of the cable body, stress cone, and connector; Figure 17 This is a half-sectional view of the explosion-proof connector.

[0017] Figure label: Explosion-proof connector 100, inner core assembly 110, core cylinder 111, flexible semi-jointed outer sleeve 112, filler layer 113, drain port 114, core groove 115, stress cone groove 116, inner liner 117, outer sleeve assembly 120, front sleeve 121, liquid storage tank 122, sealing end cap 123, spring one 124, sliding plug 125, trigger groove 126, one-way liquid injection port 127, trigger structure 130, positioning cylinder 131, liquid inlet groove 132, cross base 133, spring two 134, plug column 135, temperature sensing glass column 136, rear sleeve 140, sealing ring 141, moisture-proof shell 142, sliding ring 143, spring three 144, end cap 145, cable body 200, stress cone 210, inner limit block 220, connector 221, protective cover 222, explosion-proof cover 300, one-way air injection port 310.

[0018] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0019] The flexible explosion-proof device for 110 kV and above cable joints provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0020] like Figures 1 to 17 As shown, an embodiment of the present invention provides a flexible explosion-proof device for 110 kV and above cable joints, including an explosion-proof joint 100, a cable body 200, and an explosion-proof cover 300. Two sets of explosion-proof joints 100 are provided and can be assembled with each other. The cable body 200 is installed inside the explosion-proof joint 100. Two sets of explosion-proof covers 300 are provided and sealed at the connection point of the two sets of explosion-proof joints 100. The explosion-proof joint 100 is composed of an inner core assembly 110, an outer sleeve assembly 120, and a rear sleeve 140. The inner core assembly 110 includes a core cylinder 111, and a flexible semi-jointed outer sleeve 112 is fixedly installed on the front wall of the core cylinder 111. The flexible semi-jointed outer sleeve 112 is made of flexible insulating material, which serves as insulation and facilitates splicing of the two sets of cables by the operator. The two sets of flexible semi-jointed outer sleeves 112 are symmetrically arranged and can be inserted into each other. The flexible semi-splittered outer jacket 112 and the inner wall of the core cylinder 111 are both provided with a filler layer 113, and the filler layer 113 can be filled with inorganic plugging material. The inorganic plugging material is a mixture of high-temperature resistant inorganic material and fast-curing agent. It can be quickly cured after contact with water to form a dense structure. The top of the core cylinder 111 is provided with a drain port 114, and the drain port 114 is connected to the inside of the filler layer 113. The drain port 114 can drain liquid water, which can prevent the generation of an explosion in the event of an explosion risk. The inner wall of the middle part of the core cylinder 111 is provided with a core-running groove 115, and the cable in the cable body 200 can pass through the core-running groove 115. The inner wall of the end of the core cylinder 111 is provided with a stress cone groove 116 that is connected to the core-running groove 115. The stress cone groove 116 is provided with a stress cone to play a role in uniform voltage. The end wall of the core cylinder 111 is clamped with an inner liner 117.

[0021] As one implementation method in this embodiment, such as Figures 8 to 10As shown, the outer sleeve assembly 120 includes a front sleeve 121. The inner wall of the front sleeve 121 is inserted into the outer wall of the front end of the core cylinder 111. After assembly, the front sleeve 121 and the core cylinder 111 can be fixed with bolts. A liquid storage tank 122 is provided in the inner wall of the front end of the front sleeve 121. The liquid storage tank 122 is filled with liquid water. A sealing end cap 123 is sealed and fixed to the front end wall of the front sleeve 121. The sealing end cap 123 can seal the liquid storage tank 122. A spring 124 is provided in the liquid storage tank 122. The front end of the spring 124 is fixedly connected to the cover wall of the sealing end cap 123. A sliding plug 125 is fixedly installed on the other end of the spring 124. The sliding plug 125 is slidably connected to the inner wall of the liquid storage tank 122. When the triggering structure 130 is not triggered, the hydraulic pressure in the liquid storage tank 122 can compress the spring 124. The inner wall of the top of the front sleeve 121 is provided with a triggering groove 126, and the triggering structure 130 is provided in the triggering groove 126. The bottom of the triggering groove 126 is connected to the drain port 114. After the triggering structure 130 is triggered, the liquid water in the liquid storage tank 122 can enter the drain port 114 through the bottom opening of the triggering groove 126. The top of the front sleeve 121 is provided with a one-way injection port 127, and the one-way injection port 127 is connected to the inside of the liquid storage tank 122. The one-way injection port 127 consists of a one-way valve and an inlet, that is, liquid water can only be introduced into the liquid storage tank 122 from the outside through the one-way injection port 127.

[0022] In this embodiment, as Figures 13 to 15As shown, the trigger structure 130 includes a positioning cylinder 131, which is fixedly connected to the inner wall of the trigger groove 126. The trigger groove 126 supports the positioning cylinder 131. Three sets of liquid inlet grooves 132 are evenly opened on the side wall of the positioning cylinder 131 located in the liquid storage tank 122. A cross base 133 is fixedly installed on the bottom inner wall of the positioning cylinder 131. A second spring 134 is fixedly installed on the top of the cross base 133. A plug column 135 is fixedly installed on the top of the second spring 134. Both the second spring 134 and the first spring 124 are in a compressed state. A temperature-sensitive glass column 136 is fixedly installed on the top inner wall of the positioning cylinder 131. The bottom of the temperature-sensitive glass column 136 contacts the top of the plug column 135. The plug column 135 works in conjunction with the liquid inlet grooves 132. The inside of the temperature-sensitive glass column 136 is sealed with a special thermosensitive liquid (G / F). The connector is a high-strength glass shell. In this invention, when the connector is short-circuited between phases or to ground due to factors such as aging of the insulation material or moisture, which poses an explosion risk, the cable at the connector will heat up rapidly due to high-voltage discharge. When the temperature rises to the melting temperature of the heat-sensing glass column 136, the heat-sensing glass column 136 will crack due to heat, causing the bottom plug column 135 to be lifted by the second spring 134. At this time, the liquid inlet trough 132 is opened, causing the drain port 114 to connect with the liquid storage trough 122, that is, the internal air pressure of the liquid storage trough 122 is unbalanced. Under the action of the first spring 124, the sliding plug 125 can push the liquid water in the liquid storage trough 122 into the filler layer 113 through the drain port 114, so that the inorganic plugging material in the filler layer 113 will quickly solidify upon contact with water, forming a dense structure, thereby achieving explosion-proof and flame-retardant effects.

[0023] As one implementation method in this embodiment, such as Figures 5 to 7 As shown, the rear sleeve 140 is inserted into the outer wall of the end of the core tube 111. After the rear sleeve 140 and the core tube 111 are inserted, they can be fixed together by bolts. A sealing ring 141 is installed on the inner wall of the end of the rear sleeve 140. The sealing ring 141 can prevent external water and dust from interfering with the device. A moisture-proof shell 142 is fixedly installed on the end wall of the rear sleeve 140. Sliding rings 143 are slidably installed on the inner walls of both ends of the moisture-proof shell 142. A spring 144 is provided between the two sets of sliding rings 143. The two ends of the spring 144 are fixedly connected to the end walls of the two sets of sliding rings 143 respectively. The spring 144 is in a compressed state. When the spring 144 is in a compressed state, it can squeeze the sealing ring 141 to enhance the sealing effect of the sealing ring 141. An end cap 145 is threadedly engaged on the end wall of the moisture-proof shell 142. The moisture-proof shells 142 at both ends are assembled with the corresponding rear sleeves 140. After the assembly is completed, the end cap 145 is tightened for the final fastening operation.

[0024] In this embodiment, as Figure 5 , Figure 6 , Figure 16 and Figure 17As shown, the cable body 200 passes through two sets of slip rings 143 and is in sealing contact with the inner wall of the sealing ring 141. The sealing ring 141 can seal the inside of the rear sleeve 140. With the thrust of the slip ring 143, it can prevent external water from entering the explosion-proof joint 100 and affecting the inorganic plugging material. The end wall of the cable body 200 contacts the end wall of the inner liner 117, and the stripping installation operation is performed at the contact point. The inner wall of the stress cone groove 116 is fitted with a stress cone 210. The cable passes through the stress cone 210 and the core groove 115. In this invention, after the cable body 200 passes through two sets of slip rings 143, the stripping operation is performed. The cable inside the cable body 200 passes through the stress cone 210 and the core groove 115 in sequence. Inorganic plugging material is filled in the filler layer 113 inside the core cylinder 111. Then, the rear sleeve 140 and the core cylinder 111 are installed together and fixed with bolts, so that the end wall of the cable body 200 and the inner liner 117 are in close contact.

[0025] In this embodiment, as Figure 3 , Figure 4 , Figure 16 and Figure 17 As shown, the two sets of flexible semi-jointed jackets 112, after assembly, have an inner limiting block 220 inside, which serves as a support. A connector 221 is provided on the outside of the inner limiting block 220, allowing different cables to be spliced ​​together. A protective cover 222 is provided on the outside of the connector 221, and the protective cover 222, connector 221, and inner limiting block 220 can be fixed together with bolts. In this invention, the inner limiting block 220 is placed in the middle of multiple cables. The cables in the two sets of explosion-proof connectors 100 are then installed together sequentially via connector 221. Subsequently, the inner limit block 220, connector 221, and protective cover 222 are installed sequentially via bolts. After the two sets of cables are installed, inorganic sealing material is filled into the two sets of flexible semi-jointed jackets 112, and the two sets of explosion-proof connectors 100 are combined together. Then, the two sets of explosion-proof covers 300 are connected to the explosion-proof connectors 100 via bolts, and helium is injected into the explosion-proof cover 300 through the one-way gas injection port 310.

[0026] As one implementation method in this embodiment, such as Figure 1 and Figure 2 As shown, the two sets of explosion-proof covers 300 are fixedly connected to the top and bottom end walls of the core cylinder 111, and can form a sealed cavity between the outer sides of the two sets of core cylinders 111. The connection of the explosion-proof covers 300 is provided with sealing strips to form a sealing condition. The top of the explosion-proof cover 300 has a one-way gas injection port 310, and helium can be injected into the formed sealed cavity through the one-way gas injection port 310. Helium achieves the effect of explosion-proof and flame-retardant by inert suffocation, isolating oxygen, and diluting flammable gas. At the same time, it also has electrical insulation. When used in the sealed cavity, it can prevent combustion inside during short circuits and also has a buffering effect to avoid the danger of explosion.

[0027] The installation method of the technical solution provided by this invention is as follows: S1: After the cable body 200 passes through two sets of slip rings 143, the insulation is stripped. The cable inside the cable body 200 passes through the stress cone 210 and the core groove 115 in sequence. Inorganic plugging material is filled into the filler layer 113 inside the core cylinder 111. Then, the rear sleeve 140 is installed together with the core cylinder 111 and fixed with bolts so that the end wall of the cable body 200 is in close contact with the inner lining 117. S2: Then, the front sleeve 121 is put on the core cylinder 111 and fixed together with bolts. Liquid water is introduced into the liquid storage tank 122 through the one-way liquid injection port 127, so that it squeezes the sliding plug 125 and compresses the spring 124. S3: Place the inner limit block 220 in the middle of multiple cables, and install the cables in the two sets of explosion-proof connectors 100 together in sequence through connector 221. Then install the inner limit block 220, connector 221 and protective cover 222 in sequence with bolts. S4: After the two sets of cables are installed, inorganic sealant is filled into the two sets of flexible semi-jointed jackets 112, and the two sets of explosion-proof connectors 100 are combined together. Then, the two sets of explosion-proof covers 300 are connected to the explosion-proof connectors 100 with bolts, and helium is injected into the explosion-proof cover 300 through the one-way gas injection port 310. S5: Finally, assemble the moisture-proof shells 142 at both ends with the corresponding rear sleeves 140. After assembly, tighten the end caps 145 for final fastening.

[0028] The explosion-proof principle of the technical solution provided by this invention is as follows: When the joint is short-circuited between phases or to ground due to factors such as aging of the insulation material or moisture, i.e., there is a risk of explosion, the cable at the joint will heat up rapidly due to high-voltage discharge. When the temperature rises to the melting temperature of the temperature-sensing glass column 136, the temperature-sensing glass column 136 will crack due to heat, causing the plug column 135 at its bottom to be pushed up by the second spring 134. At this time, the liquid inlet 132 is opened, causing the drain port 114 to connect with the liquid storage tank 122, i.e., the air pressure inside the liquid storage tank 122 is unbalanced. Under the action of the first spring 124, the sliding plug 125 can push the liquid water in the liquid storage tank 122 into the filler layer 113 through the drain port 114, so that the inorganic plug material in the filler layer 113 will quickly solidify upon contact with water, forming a dense structure, thereby achieving the effects of explosion-proof and flame retardant.

[0029] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0030] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A flexible explosion-proof device for 110 kV and above cable joints, comprising an explosion-proof joint (100), a cable body (200), and an explosion-proof cover (300), wherein the explosion-proof joint (100) is provided in two sets and can be assembled with each other, the cable body (200) is installed inside the explosion-proof joint (100), and the explosion-proof cover (300) is provided in two sets and is sealed at the connection between the two sets of explosion-proof joints (100), characterized in that, The explosion-proof connector (100) is composed of an inner core assembly (110), an outer sleeve assembly (120) and a rear sleeve (140); The inner core assembly (110) includes a core cylinder (111). A flexible semi-assembled outer sleeve (112) is fixedly installed on the front wall of the core cylinder (111). Two sets of the flexible semi-assembled outer sleeves (112) are symmetrically arranged and can be inserted into each other. Both the flexible semi-assembled outer sleeves (112) and the inner wall of the core cylinder (111) are provided with a filler layer (113), and inorganic plugging material can be filled in the filler layer (113). The top of the core cylinder (111) is open. A drain port (114) is provided, and the drain port (114) is connected to the interior of the packing layer (113). A core groove (115) is provided on the inner wall of the middle part of the core cylinder (111), and the cable in the cable body (200) can pass through the core groove (115). A stress cone groove (116) is provided on the inner wall of the end of the core cylinder (111) and is connected to the core groove (115). An inner liner (117) is snapped onto the end wall of the core cylinder (111).

2. The flexible explosion-proof device for 110 kV and above cable joints according to claim 1, characterized in that, The outer sleeve assembly (120) includes a front sleeve (121), the inner wall of which is inserted into the outer wall of the front end of the core cylinder (111). A liquid storage tank (122) is provided in the inner wall of the front end of the front sleeve (121), and the liquid storage tank (122) is filled with liquid water. A sealing end cap (123) is sealed and fixed to the front end wall of the front sleeve (121), and the sealing end cap (123) can seal the liquid storage tank (122). A spring (124) is provided in the liquid storage tank (122), and the front end of the spring (124) is connected to the sealing end cap. (123) The cover wall is fixedly connected, and the other end of the spring (124) is fixedly installed with a sliding plug (125), and the sliding plug (125) is sealed and slidably connected to the inner wall of the liquid storage tank (122). The top inner wall of the front sleeve (121) is provided with a trigger groove (126), and the trigger groove (126) is provided with a trigger structure (130). The bottom of the trigger groove (126) is connected to the drain port (114). The top of the front sleeve (121) is provided with a one-way injection port (127), and the one-way injection port (127) is connected to the inside of the liquid storage tank (122).

3. The flexible explosion-proof device for 110 kV and above cable joints according to claim 2, characterized in that, The triggering structure (130) includes a positioning cylinder (131), which is fixedly connected to the inner wall of the triggering groove (126). The side wall of the positioning cylinder (131) located in the liquid storage tank (122) is evenly provided with three sets of liquid inlet grooves (132). A cross base (133) is fixedly installed on the bottom inner wall of the positioning cylinder (131). A second spring (134) is fixedly installed on the top of the cross base (133). A plug column (135) is fixedly installed on the top of the second spring (134). Both the second spring (134) and the first spring (124) are in a compressed state. A temperature-sensing glass column (136) is fixedly installed on the top inner wall of the positioning cylinder (131). The bottom of the temperature-sensing glass column (136) is in contact with the top of the plug column (135). The plug column (135) is used in conjunction with the liquid inlet groove (132).

4. The flexible explosion-proof device for 110 kV and above cable joints according to claim 1, characterized in that, The rear sleeve (140) is inserted into the outer wall of the end of the core cylinder (111). A sealing ring (141) is installed on the inner wall of the end of the rear sleeve (140). A moisture-proof shell (142) is fixedly installed on the end wall of the rear sleeve (140). Sliding rings (143) are slidably installed on the inner walls of both ends of the moisture-proof shell (142). A spring three (144) is provided between the two sets of sliding rings (143). The two ends of the spring three (144) are fixedly connected to the end walls of the two sets of sliding rings (143), and the spring three (144) is in a compressed state. An end cap (145) is threadedly engaged on the end wall of the moisture-proof shell (142).

5. The flexible explosion-proof device for 110 kV and above cable joints according to claim 4, characterized in that, The cable body (200) passes through two sets of slip rings (143) and is in sealed contact with the inner wall of the sealing ring (141). The end wall of the cable body (200) is in contact with the end wall of the inner liner (117), and a stripping installation operation is performed at the contact point. The inner wall of the stress cone groove (116) is fitted with a stress cone (210), and the cable passes through the stress cone (210) and the core groove (115).

6. The flexible explosion-proof device for 110 kV and above cable joints according to claim 5, characterized in that, The two sets of flexible semi-splitting jackets (112) are assembled with an inner limiting block (220) inside. The inner limiting block (220) is provided with a connector (221) on the outside. Different cables can be spliced ​​through the connector (221). The connector (221) is provided with a protective cover (222) on the outside. The protective cover (222) can be fixed to the inner limiting block (220) by bolts.

7. The flexible explosion-proof device for 110 kV and above cable joints according to claim 1, characterized in that, The two sets of explosion-proof covers (300) are fixed to the top and bottom end walls of the core cylinder (111) and can form a sealed cavity between the outer sides of the two sets of core cylinders (111). The top of the explosion-proof cover (300) is provided with a one-way gas injection port (310) and helium can be injected into the formed sealed cavity through the one-way gas injection port (310).

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