Explosion-proof device for intermediate joint of cable

Abstract

The invention relates to the technical field of electrical equipment, and discloses a cable intermediate joint explosion-proof device, which comprises a shell, the shell comprises a plurality of first shell plates and a plurality of second shell plates, and the shell can be switched between the following two states: when the shell is in a closed state, the plurality of first shell plates enclose to form a first polygon prism structure, and the plurality of second shell plates enclose to form a second polygon prism structure; the side edge of the first shell plate is connected with the side edge of the adjacent first shell plate, and the sliding block is located at one end of the sliding groove. When the shell is in the expansion state, the first shell plates and the second shell plates jointly define a second polygon prism structure, the edge number of the first polygon prism structure is larger than that of the second polygon prism structure, the side edges of every two adjacent first shell plates are separated from each other and connected through one second shell plate, and the sliding block is located at the other end of the sliding groove. The cable intermediate joint explosion-proof device provided by the invention is used for solving the problems that an explosion-proof shell is rigid in structure, explosion pressure cannot be effectively buffered, and brittle fracture and secondary damage are easy to occur.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, in particular to an explosion-proof device for a cable intermediate joint. Background Art

[0002] In power transmission and distribution systems, cable joints are critical components that connect two cable segments and ensure power line continuity. Their operational reliability is directly related to the safety and stability of the entire power grid. However, due to a variety of factors, including manufacturing processes, installation quality, material aging, environmental corrosion, and damage from external forces, cable joints are a relatively weak link in the power system.

[0003] When a fault such as insulation breakdown or a short circuit occurs inside a cable joint, a massive arc energy is released in a very short period of time, causing a sharp increase in internal temperature and pressure, leading to a violent explosion. This explosion is extremely destructive, generating high-pressure shock waves, high-temperature arcs, and high-speed flying shell fragments. These can not only severely damage other surrounding electrical equipment and cause widespread power outages, but also pose a serious threat to the lives of on-site workers and public property.

[0004] To mitigate the hazards posed by explosions at cable connectors, explosion-proof devices are commonly used in existing technologies. These devices typically consist of a rigid, integrated metal or composite shell that relies on its own structural strength to rigidly withstand and contain the energy and shock waves generated by the explosion. However, this traditional protection method has significant limitations: its protective capacity has an upper limit. This rigid structure cannot effectively buffer or channel the rapidly fluctuating internal pressure during an explosion, causing the internal pressure to peak instantaneously. Once the internal explosion energy exceeds the shell's design load capacity, the shell itself will rupture or even disintegrate, and its fragments will cause secondary damage, exacerbating the damage caused by the accident. Summary of the Invention

[0005] The purpose of the present invention is to provide an explosion-proof device for a cable intermediate joint to solve the problems in the prior art of rigid explosion-proof housing structure, inability to effectively buffer explosion pressure, and susceptibility to brittle fracture and secondary damage.

[0006] In order to achieve the above object, the present invention provides an explosion-proof device for a cable intermediate joint, comprising a housing, the housing comprising:

[0007] A plurality of first shell plates, wherein the inner walls of the first shell plates are provided with sliding grooves;

[0008] A plurality of second shell plates, each of which is provided with a slider that slides in cooperation with the slide groove;

[0009] The housing can be switched between the following two states:

[0010] In a closed state, when the housing is in the closed state, the plurality of first shell plates are enclosed together to form a first polygonal column structure, the side edges of the first shell plates are connected to the side edges of the adjacent first shell plates, and the slider is located at one end of the slide groove;

[0011] In the expanded state, when the shell is in the expanded state, a plurality of the first shell plates and a plurality of the second shell plates together enclose a second polygonal column structure, the number of sides of the first polygonal column structure is greater than the number of sides of the second polygonal column structure, the side edges of two adjacent first shell plates are separated from each other and connected by a second shell plate, and the slider is located at the other end of the slide groove.

[0012] Furthermore, the cable intermediate joint explosion-proof device also includes an end cover, and an annular groove is formed on the end surface of the end cover facing the shell, and the end of the first shell plate and the end of the second shell plate are both slidably arranged in the annular groove.

[0013] Furthermore, the cable intermediate joint explosion-proof device also includes a driving component, which is used to drive the shell to switch between the closed state and the expanded state. The driving component includes a transmission part and an adjustment part. The transmission part is connected to a plurality of second shell plates in a transmission manner. The power output end of the adjustment part is connected to the transmission part, and can drive the transmission part to operate according to the internal temperature change of the shell.

[0014] Furthermore, the cable intermediate joint explosion-proof device further includes a wire tube, which passes through the center of the end cover and is fixedly connected to the end cover, and the transmission part includes:

[0015] A fixing plate, the fixing plate being fixed to the wire tube, the fixing plate being provided with a plurality of radially extending slots spaced circumferentially;

[0016] A plurality of insertion rods, each of the plurality of insertion rods being slidably disposed in the slots in a one-to-one correspondence, and one end of each of the insertion rods being correspondingly connected to an inner wall of the second shell plate;

[0017] A transmission disk is rotatably arranged on the wire tube, and a plurality of arc-shaped holes are circumferentially spaced apart on the transmission disk. A guide column is provided on the insertion rod, and the guide column is slidably arranged in the arc-shaped hole. The guide columns are slidably arranged in the arc-shaped hole in a one-to-one corresponding manner.

[0018] Furthermore, the adjustment unit includes:

[0019] An adjusting gear, the adjusting gear being coaxially fixed to the transmission disc;

[0020] an adjusting rack meshing with the adjusting gear;

[0021] A thermal drive component, wherein a power output end of the thermal drive component is connected to the adjustment rack and is used to drive the adjustment rack to reciprocate.

[0022] Furthermore, the cable intermediate joint explosion-proof device further includes a pressure relief component, and the pressure relief component includes:

[0023] a pressure relief block, the pressure relief block being arranged on the inner wall of the first shell plate, and having a pressure relief cavity therein;

[0024] a pressure relief hood, the pressure relief hood being arranged at the middle portion of the inner wall of the first shell plate and being in communication with the pressure relief cavity;

[0025] A pressure relief device is provided on the outside of the shell, and the pressure relief cover, the pressure relief chamber and the pressure relief device are connected in sequence.

[0026] Furthermore, the pressure relief chamber has a one-way flow portion inside, and the flow direction is from the pressure relief cover to the pressure relief device.

[0027] Furthermore, the pressure relief assembly also includes a plurality of pressure relief pipes, which are connected to the pressure relief chambers one-to-one, and the end cover is circumferentially spaced apart with a plurality of pressure relief holes corresponding to the pressure relief blocks one-to-one, and the pressure relief holes are waist-shaped holes, and the waist shape of the pressure relief holes extends radially along the end cover, and the pressure relief pipes pass through the corresponding pressure relief holes.

[0028] Furthermore, heat dissipation strips are arranged on the outer wall of the first shell plate.

[0029] Furthermore, the heat dissipation strip extends along the length direction of the first shell.

[0030] Compared with the prior art, the explosion-proof device for a cable intermediate joint according to the embodiment of the present invention has the following advantages:

[0031] 1. Active energy absorption and buffering to avoid rigid impact: The shell is designed as a deformable structure through the sliding first and second shell plates. When the internal explosion generates huge pressure, the shell does not resist rigidly. Instead, through the controlled expansion process of the first shell plate separating under pressure and the second shell plate sliding out to fill, the instantaneous impact energy of the explosion is converted into kinetic energy and frictional dissipation energy of the shell components, playing a role in buffering and absorbing energy, and changing the energy resistance method;

[0032] 2. Dynamically increase the volume and effectively reduce the peak pressure: At the moment of the explosion, the shell quickly switches from a closed state to an expanded state, significantly increasing the internal volume enclosed by the shell. According to the gas state equation, the peak pressure of the high-pressure gas generated by the internal explosion can be quickly and effectively reduced, making the final pressure acting on the inner wall of the shell much lower than its pressure under rigid, fixed volume, thereby avoiding the shell from rupture due to excessive local stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 2 is a schematic structural diagram of the cable intermediate joint explosion-proof device in a closed state according to an embodiment of the present invention;

[0034] Figure 2 2 is a schematic structural diagram of the cable intermediate joint explosion-proof device in an expanded state according to an embodiment of the present invention;

[0035] Figure 3 2 is a schematic structural diagram of the shell of the cable intermediate joint explosion-proof device in a closed state according to an embodiment of the present invention;

[0036] Figure 4 2 is a schematic structural diagram of a first shell plate and a pressure relief assembly of an explosion-proof device for an intermediate cable joint according to an embodiment of the present invention;

[0037] Figure 5 2 is a schematic structural diagram of the first shell plate and the pressure relief assembly of the cable intermediate joint explosion-proof device according to an embodiment of the present invention from another angle;

[0038] Figure 6 2 is a schematic structural diagram of a pressure relief block of an explosion-proof device for an intermediate cable joint according to an embodiment of the present invention;

[0039] Figure 7 2 is a schematic structural diagram of a second shell plate of an explosion-proof device for an intermediate cable joint according to an embodiment of the present invention;

[0040] Figure 8 This is a schematic structural diagram of an end cover and a drive assembly of an explosion-proof device for an intermediate cable joint according to an embodiment of the present invention;

[0041] Figure 9 2 is a schematic structural diagram of an end cover of an explosion-proof device for a cable intermediate joint according to an embodiment of the present invention;

[0042] Figure 10 This is a structural schematic diagram of a portion of the transmission portion of the cable intermediate joint explosion-proof device according to an embodiment of the present invention;

[0043] Figure 11 This is a structural diagram of part of the transmission part and part of the adjustment part of the cable intermediate joint explosion-proof device according to an embodiment of the present invention;

[0044] Figure 12This is a structural diagram of a wire tube and part of an adjustment portion of an explosion-proof device for a cable intermediate joint according to an embodiment of the present invention;

[0045] In the figure, 1, housing;

[0046] 11. First shell plate; 111. Slide groove; 112. First stop edge;

[0047] 12. Second shell plate; 121. Slider; 122. Second stop edge;

[0048] 2. End cap; 21. Annular groove; 211. Inner groove wall; 2111. First wall; 2112. Second wall; 212. Outer groove wall; 2121. Third wall; 2122. Fourth wall; 213. Pressure relief hole;

[0049] 3. Drive components;

[0050] 31. Transmission unit; 311. Fixing plate; 3111. Slot; 312. Insertion rod; 3121. Guide post; 313. Transmission plate; 3131. Arc-shaped hole;

[0051] 32. Adjustment unit; 321. Adjustment gear; 322. Adjustment rack; 323. Thermal drive element; 324. Adjustment bracket;

[0052] 4. Wire tube;

[0053] 5. Pressure relief assembly; 51. Pressure relief block; 511. Pressure relief chamber; 5111. One-way flow portion; 52. Pressure relief cover; 53. Pressure relief pipe;

[0054] 6. Heat dissipation strips;

[0055] 7. The first polyhedral structure;

[0056] 8. The second polyhedral structure. DETAILED DESCRIPTION

[0057] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0058] In the description of the present invention, the terms "upper," "lower," "left," "right," "front," "back," "inner," "outer," "lateral," and "longitudinal" to indicate directions or positions are based on the directions or positions shown in the accompanying drawings. These terms are used solely to facilitate the description of the present invention and to simplify the description. They are not intended to limit the devices, elements, or components indicated to having a specific direction, or to be constructed or operated in a specific direction. Therefore, they should not be construed as limitations on the present invention. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0059] In the description of the present invention, the terms "provided with," "disposed," "connected," and "placed" should be interpreted broadly. For example, they may refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0060] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0061] The technical solution of the present invention is further described below with reference to the embodiments and drawings.

[0062] like Figure 1 、 2 As shown in Figures 5 and 6, an explosion-proof device for a cable intermediate joint according to an embodiment of the present invention includes a housing 1, which includes:

[0063] A plurality of first shell plates 11, wherein the inner wall of the first shell plates 11 is provided with a slide groove 111;

[0064] A plurality of second shell plates 12, each provided with a slider 121 that slides in cooperation with the slide groove 111;

[0065] The housing 1 can be switched between the following two states:

[0066] In the closed state, when the housing 1 is in the closed state, the plurality of first shell plates 11 together enclose the first polygonal column structure 7, the side of the first shell plate 11 is connected to the side of the adjacent first shell plate 11, and the slider 121 is located at one end of the slide groove 111;

[0067] In the expanded state, when the shell 1 is in the expanded state, the plurality of first shell plates 11 and the plurality of second shell plates 12 together enclose a second polygonal column structure 8. The number of sides of the first polygonal column structure 7 is greater than the number of sides of the second polygonal column structure 8. The side edges of two adjacent first shell plates 11 are separated from each other and connected by a second shell plate 12. The slider 121 is located at the other end of the slide groove 111.

[0068] In a specific embodiment, the shell 1 is composed of six first shell plates 11 and six second shell plates 12. The inner wall of the first shell plate 11 is provided with a slide groove 111 on both sides of its length direction. The extension direction of the slide groove 111 is perpendicular to the length direction of the first shell plate 11. Two sliders 121 that cooperate with the slide groove 111 are fixedly provided on the outer wall of the second shell plate 12. A slider 121 on a second shell plate 12 is slidably connected to the slide groove 111 of a first shell plate 11, and another slider 121 on the second shell plate 12 is slidably connected to the slide groove 111 of the first shell plate 11 adjacent to the first shell plate 11. The sliding of the slider 121 in the slide groove 111 realizes the movable connection between the first shell plate 11 and the second shell plate 12.

[0069] In a specific embodiment, Figure 5 、 7 As shown, the first shell plate 11 is provided with first retaining edges 112 on both sides of its longitudinal direction, and the first retaining edges 112 protrude inwardly. The second shell plate 12 is provided with second retaining edges 122 on both sides of its longitudinal direction, and the second retaining edges 122 protrude outwardly.

[0070] Based on the above technical solution,

[0071] Under normal operating conditions or before an explosion occurs, the housing 1 is in a closed state. At this time, the first retaining edges 112 of the six first shell plates 11 abut against each other, forming a regular hexagonal prism structure (i.e., the first polyhedral prism structure 7). The second shell plate 12 is accommodated inside the regular hexagonal prism structure, and the slider 121 is located at one end of the slide groove 111 close to the middle of the first shell plate 11.

[0072] When an explosion occurs inside the cable structure and a huge impact pressure is generated instantly, the pressure acts on the inner walls of all the first shell plates 11 and the second shell plates 12, pushing the first shell plates 11 and the second shell plates 12 to move radially outward. The first shell plates 11 move outward, and their first retaining edges 112 separate from each other. At this time, the second shell plates 12 slide out, connecting and closing the newly generated gap between the two adjacent first shell plates 11. At this time, the first retaining edge 112 and the second retaining edge 122 abut against each other, and the slider 121 is located at the outermost end of the slide groove 111 close to the edge of the first shell plate 11. The six first shell plates 11 and the six second shell plates 12 together enclose a twelve-prism structure with more sides and a larger internal volume (that is, the second polyhedral structure 8).

[0073] Active buffering and energy absorption to avoid rigid impact: The shell 1 is designed as a deformable structure through the mutually slidable first shell plate 11 and second shell plate 12. When the internal explosion generates huge pressure, the shell 1 does not resist rigidly. Instead, through the controlled expansion process of the first shell plate 11 separating under pressure and the second shell plate 12 sliding out to fill, the instantaneous impact energy of the explosion is converted into kinetic energy and frictional dissipation energy of the shell 1 components, playing a role in buffering and absorbing energy, and changing the energy resistance method;

[0074] Dynamically increase the volume and effectively reduce the peak pressure: At the moment of the explosion, the shell 1 quickly switches from a closed state to an expanded state, which significantly increases the internal volume enclosed by the shell 1. According to the gas state equation, the pressure peak of the high-pressure gas generated by the internal explosion can be quickly and effectively reduced, so that the final pressure acting on the inner wall of the shell 1 is much lower than its pressure under rigid, fixed volume, thereby avoiding the shell 1 from rupture due to excessive local stress.

[0075] Preferably, if Figure 8 、 9 As shown, the cable intermediate joint explosion-proof device also includes an end cover 2, and an annular groove 21 is formed on the end surface of the end cover 2 facing the shell 1. The end of the first shell plate 11 and the end of the second shell plate 12 are both slidably arranged in the annular groove 21.

[0076] In a specific embodiment, end covers 2 are respectively provided at both ends of the housing 1 , and a connecting structure is provided between the end covers 2 (the connecting structure is not shown in the drawings of the specification).

[0077] In a specific embodiment, Figure 9 As shown, the annular groove 21 includes an inner groove wall 211 and an outer groove wall 212 . The inner groove wall 211 includes a first wall 2111 and a second wall 2112 spaced apart from each other. The outer groove wall 212 includes a third wall 2121 and a fourth wall 2122 spaced apart from each other.

[0078] When the shell 1 is in a closed state, the end edge of the first shell plate 11 abuts against the first wall 2111, and the end edge of the second shell plate 12 abuts against the second wall 2112; when the shell 1 is in an expanded state, the end edge of the first shell plate 11 abuts against the third wall 2121, and the end edge of the second shell plate 12 abuts against the fourth wall 2122.

[0079] When the shell 1 is in a closed state, its end is constrained and sealed by the annular groove 21, which effectively prevents the cable intermediate joint inside the shell 1 from being exposed to the external environment, avoids erosion by external factors such as dust, and provides a stable and clean working environment for the cable intermediate joint. At the same time, the end plate and the annular groove 21 guide and limit the radial expansion of the first shell plate 11 and the second shell plate 12, ensuring the stability and reliability of the expansion process.

[0080] More preferably, if Figure 8 As shown, the cable intermediate joint explosion-proof device also includes a driving component 3, which is used to drive the shell 1 to switch between a closed state and an expanded state. The driving component 3 includes a transmission part 31 and an adjustment part 32. The transmission part 31 is transmission-connected to a plurality of second shell plates 12. The power output end of the adjustment part 32 is connected to the transmission part 31, and can drive the transmission part 31 to operate according to the internal temperature change of the shell 1.

[0081] The regulating part 32 can monitor the temperature signal inside the shell 1 in real time. Once the temperature exceeds the safety threshold, the driving component 3 can actively drive the shell 1 to expand before the explosion occurs, that is, the pressure relief window is opened when the fire hazard just appears, thereby transforming the possible explosion accident into a controllable, non-destructive pressure relief and cooling process.

[0082] More preferably, if Figure 10 、 11 As shown, the cable intermediate joint explosion-proof device further includes a wire tube 4, which passes through the center of the end cover 2 and is fixedly connected to the end cover 2. The transmission part 31 includes:

[0083] A fixing plate 311 is fixed to the wire tube 4 and has a plurality of radially extending slots 3111 spaced circumferentially therefrom;

[0084] A plurality of insertion rods 312 , each of which is slidably disposed in the slots 3111 , and one end of each insertion rod 312 is connected to an inner wall of the second shell plate 12 ;

[0085] The transmission disk 313 is rotatably set on the wire tube 4. The transmission disk 313 is provided with multiple arc holes 3131 spaced circumferentially. The insertion rod 312 is provided with guide columns 3121. The guide columns 3121 are slidably set in the arc holes 3131. The guide columns 3121 are slidably set in the arc holes 3131 in a one-to-one corresponding manner.

[0086] In a specific embodiment, the arc-shaped hole 3131 has a curved profile that does not extend radially.

[0087] Based on the above technical solution, when the transmission disk 313 is driven to rotate by the adjustment portion 32, since the arc-shaped hole 3131 thereon has a non-radially extending curved profile, the inner wall of the arc-shaped hole 3131 will push the guide column 3121 like a cam. Since the insertion rod 312 is constrained by the radially extending slot 3111 on the fixed plate 311 and can only perform radial linear motion, the movement of the guide column 3121 will drive the entire insertion rod 312 to slide radially, thereby driving the second shell plate 12 to achieve synchronous expansion or contraction.

[0088] The guide posts 3121 of all the insertion rods 312 are driven by the arcuate holes 3131 on the same transmission disk 313. When the transmission disk 313 rotates, the angular displacement of all the arcuate holes 3131 relative to their respective guide posts 3121 is completely consistent, ensuring that the radial displacement of all the insertion rods 312 and the second shell plates 12 connected to them is exactly the same at any moment. This high degree of synchronization prevents the movement of individual shell plates of the shell 1 from advancing or lagging during expansion or contraction, thereby preventing structural jamming, tilting, or uneven force, and ensuring smooth state switching and structural stability.

[0089] The non-radial curved profile of the arc-shaped hole 3131 forms a cam-like inclined surface. When the transmission plate 313 rotates, the force applied to the guide post 3121 is primarily a tangential force. Through the inclined surface effect, this tangential force can be decomposed into a radial force that drives the insertion rod 312. This allows the entire system to be driven with only a relatively small torque, reducing the power requirement of the adjustment unit 32. The entire drive assembly 3 is more energy-efficient and easier to implement.

[0090] The movement of the transmission part 31 is completely reversible. The forward rotation of the transmission disc 313 can drive the shell 1 to expand, and the reverse rotation can drive the shell 1 to contract. This allows the device to not only automatically expand in danger, but also restore the shell 1 to a compact closed state through the reverse drive of the adjustment part 32 after the temperature returns to normal, thereby realizing the reset function. The explosion-proof device is reusable.

[0091] More preferably, if Figure 11 、 12 As shown, the adjustment unit 32 includes:

[0092] An adjusting gear 321 is coaxially fixed to the transmission plate 313;

[0093] An adjusting rack 322 , wherein the adjusting rack 322 is engaged with the adjusting gear 321 ;

[0094] The thermal drive member 323 has a power output end connected to the adjustment rack 322 for driving the adjustment rack 322 to reciprocate.

[0095] In a specific embodiment, Figure 12 As shown, the adjusting portion 32 further includes an adjusting bracket 324 , which is mounted on the wire tube 4 , and the thermal drive component 323 is mounted on the adjusting bracket 324 .

[0096] It should be noted that the thermal drive component 323 adopts the thermal element in CN103162379B.

[0097] Specifically, the thermal element is a thermal element with thermal wax. When the thermal element is heated, the thermal wax inside expands due to the heat, pushing the adjustment rack 322 to move.

[0098] More preferably, if Figure 5 As shown, the cable intermediate joint explosion-proof device further includes a pressure relief component 5, which includes:

[0099] A pressure relief block 51 is provided on the inner wall of the first shell plate 11 and defines a pressure relief cavity 511 therein;

[0100] The pressure relief cover 52 is provided at the middle portion of the inner wall of the first shell plate 11 and is in communication with the pressure relief chamber 511 ;

[0101] The pressure relief device is arranged outside the shell 1, and the pressure relief cover 52, the pressure relief chamber 511 and the pressure relief device are connected in sequence (the pressure relief device is not shown in the drawings of the specification).

[0102] In a specific embodiment, Figure 5 As shown, the cable intermediate joint explosion-proof device includes multiple pressure relief components 5, which are arranged in a one-to-one correspondence with the first shell plate 11. The pressure relief components 5 include two pressure relief blocks 51, which are arranged at intervals along the length direction of the first shell plate 11, and the heat dissipation shell is arranged between the two pressure relief blocks 51.

[0103] A synergistic dual protection mechanism has been established, significantly enhancing the explosion-proof device's pressure-bearing capacity: By providing a pressure relief component 5, a rapid gas release path is established in addition to the pressure relief mechanism provided by the overall structural expansion of the shell 1. In the initial stages of an explosion, the pressure relief component 5 responds instantaneously, directly discharging gas with peak pressure. Subsequently, the overall expansion of the shell 1 absorbs and alleviates the subsequent volumetric expansion pressure. This synergistic mechanism enables the device to specifically respond to the varying pressure characteristics of an explosion, ensuring its overall protection and reliability.

[0104] Symmetrical pressure relief is achieved, ensuring the stability of the structural expansion of the shell 1: since the pressure relief component 5 is arranged in a one-to-one correspondence with each first shell plate 11, the internal high-pressure gas can be released outward evenly and symmetrically from all sides of the shell 1, effectively avoiding the asymmetric thrust that may be generated by single-point pressure relief, ensuring that the shell 1 can still maintain force balance when subjected to internal impact, thereby ensuring that it can expand radially smoothly and synchronously, reducing the risk of structural jamming or asymmetric deformation, and improving the reliability of the device operation.

[0105] More preferably, if Figure 6 As shown, the pressure relief chamber 511 has a one-way flow portion 5111 therein, and its flow direction is from the pressure relief cover 52 to the pressure relief device.

[0106] In a specific embodiment, the one-way flow portion 5111 adopts a Tesla valve.

[0107] Ensure instantaneous and unimpeded pressure release when an explosion occurs: When an explosion occurs inside the shell 1, the huge pressure forms a strong positive airflow. The geometric configuration of the Tesla valve has extremely low resistance to this positive flow, which is almost equivalent to a smooth pipe. This ensures that the high-pressure gas generated by the explosion can be quickly discharged through the pressure relief chamber 511 instantly and unimpeded, protecting the safety of the main structure of the shell 1.

[0108] Significantly enhance the sealing ability of the shell 1 in the closed state: When the shell 1 is in the closed state on a daily basis, the heat generated by the middle connector of the cable causes the gas inside the shell 1 to expand. This tiny positive pressure can be slowly released outward through the Tesla valve to avoid the formation of negative pressure inside. External humid air, dust or corrosive gas will basically not be sucked into the shell 1; and the Tesla valve has extremely high fluid resistance to reverse flow (from the outside to the inside), thereby effectively preventing the invasion of external pollutants and playing a long-term protective role for the internal cable connector, so that the shell 1 is relatively sealed in the closed state, and the long-term operation reliability of the explosion-proof device is improved.

[0109] More preferably, the pressure relief assembly 5 also includes a plurality of pressure relief pipes 53, which are connected to the pressure relief chamber 511 in a one-to-one manner, and the end cover 2 is circumferentially spaced apart with a plurality of pressure relief holes 213 corresponding to the pressure relief blocks 51. The pressure relief holes 213 are waist-shaped holes, and the waist shape of the pressure relief holes 213 extends radially along the end cover 2. The pressure relief pipes 53 pass through the corresponding pressure relief holes 213.

[0110] In the closed state, this structure helps ensure the sealing of the interior of the housing 1: the pressure relief pipe 53 is usually located at the innermost side of the waist-shaped pressure relief hole 213. At this time, the interior of the housing 1 is not connected to the pressure relief hole 213, which can achieve a relatively effective seal and prevent the intrusion of external moisture and dust when the housing 1 is closed. Even if there is a tiny gap, its extremely small flow area greatly limits the exchange of gas inside and outside, maintaining the stability of the internal environment.

[0111] In the expanded state, the structure dynamically increases the pressure relief points and enhances the pressure relief effect: when the shell 1 is in the expanded state, the pressure relief pipe 53 slides outward along the waist-shaped pressure relief hole 213. When the pressure relief pipe 53 reaches the outermost end of the waist-shaped pressure relief hole 213, the inner part of the entire waist-shaped pressure relief hole 213 is completely exposed, forming a new pressure relief port connected to the interior of the shell 1. On the basis of the original pressure relief through the pressure relief pipe 53, additional pressure relief points and pressure relief areas are added, which further accelerates the release of internal pressure and improves the pressure relief efficiency of the device in the later stage of the explosion.

[0112] Preferably, if Figure 4As shown, heat dissipation strips 6 are arranged on the outer wall of the first shell plate 11 .

[0113] The heat dissipation surface area is increased, and the heat dissipation efficiency of the housing 1 in the closed state is improved.

[0114] More preferably, the heat dissipation strip 6 extends along the length direction of the first housing 11 .

[0115] In summary, an embodiment of the present invention provides an explosion-proof device for a cable intermediate joint, which 1. actively buffers and absorbs energy to avoid rigid impact: the shell 1 is designed as a deformable structure through a first shell plate 11 and a second shell plate 12 that can slide against each other. When the internal explosion generates huge pressure, the shell 1 does not resist rigidly, but through a controlled expansion process in which the first shell plate 11 is compressed and separated and the second shell plate 12 slides out to fill, the instantaneous impact energy of the explosion is converted into kinetic energy and friction dissipation energy of the shell 1 components, which plays a role in buffering and absorbing energy and changes the energy confrontation mode; dynamically increases the volume and effectively reduces the peak pressure: at the moment of the explosion, the shell 1 is quickly converted from a closed state to an expanded state, so that the internal volume enclosed by the shell 1 is significantly increased. According to the gas state equation, the pressure peak of the high-pressure gas generated by the internal explosion can be quickly and effectively reduced, so that the final pressure acting on the inner wall of the shell 1 is much lower than its pressure under a rigid, fixed volume, thereby avoiding the shell 1 from rupturing due to excessive local stress. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A cable intermediate joint explosion-proof device, comprising a housing (1), characterized in that: The housing (1) comprises: A plurality of first shell plates (11), wherein a slide groove (111) is provided on the inner wall of each of the first shell plates (11); A plurality of second shell plates (12), each of the second shell plates (12) being provided with a slider (121) that slides in cooperation with the slide groove (111); The housing (1) can be switched between the following two states: In a closed state, when the housing (1) is in the closed state, a plurality of the first shell plates (11) are enclosed together to form a first polyhedral column structure (7), the side of the first shell plate (11) is connected to the side of the adjacent first shell plate (11), and the slider (121) is located at one end of the slide groove (111); In an expanded state, when the shell (1) is in the expanded state, a plurality of the first shell plates (11) and a plurality of the second shell plates (12) are enclosed together to form a second polyhedral structure (8), the number of sides of the first polyhedral structure (7) is greater than the number of sides of the second polyhedral structure (8), the sides of two adjacent first shell plates (11) are separated from each other and connected by a second shell plate (12), and the slider (121) is located at the other end of the slide groove (111).

2. The explosion-proof device for cable intermediate joints according to claim 1, characterized in that: It also includes an end cover (2), wherein an annular groove (21) is provided on the end surface of the end cover (2) facing the shell (1), and the end of the first shell plate (11) and the end of the second shell plate (12) are both slidably arranged in the annular groove (21).

3. The explosion-proof device for cable intermediate joints according to claim 2, characterized in that: The invention also includes a driving assembly (3), wherein the driving assembly (3) is used to drive the shell (1) to switch between the closed state and the expanded state. The driving assembly (3) includes a transmission part (31) and an adjustment part (32). The transmission part (31) is connected to a plurality of second shell plates (12) in a transmission manner. The power output end of the adjustment part (32) is connected to the transmission part (31), and can drive the transmission part (31) to operate according to the internal temperature change of the shell (1).

4. The explosion-proof device for cable intermediate joints according to claim 3, characterized in that: It also includes a wire tube (4), which passes through the center of the end cover (2) and is fixedly connected to the end cover (2). The transmission part (31) includes: A fixing plate (311), the fixing plate (311) being fixed on the wire tube (4), and the fixing plate (311) being provided with a plurality of radially extending slots (3111) spaced apart in the circumferential direction; A plurality of insertion rods (312), wherein the plurality of insertion rods (312) are slidably disposed in the slots (3111) in a one-to-one correspondence, and one end of each of the insertion rods (312) is correspondingly connected to an inner wall of the second shell plate (12); A transmission disc (313) is rotatably arranged on the wire tube (4), and a plurality of arc-shaped holes (3131) are circumferentially spaced apart on the transmission disc (313). A guide column (3121) is provided on the insertion rod (312), and the guide column (3121) is slidably arranged in the arc-shaped hole (3131). The guide columns (3121) are slidably arranged in the arc-shaped hole (3131) in a one-to-one corresponding manner.

5. The explosion-proof device for the cable intermediate joint according to claim 4, characterized in that: The regulating unit (32) includes: an adjusting gear (321), wherein the adjusting gear (321) is coaxially fixed to the transmission plate (313); an adjusting rack (322), wherein the adjusting rack (322) is meshed with the adjusting gear (321); A thermally sensitive driving member (323), wherein a power output end of the thermally sensitive driving member (323) is connected to the adjusting rack (322) and is used for driving the adjusting rack (322) to reciprocate.

6. The explosion-proof device for cable intermediate joints according to claim 2, characterized in that: It also includes a pressure relief component (5), which includes: A pressure relief block (51), the pressure relief block (51) being arranged on the inner wall of the first shell plate (11), and having a pressure relief cavity (511) inside the pressure relief block (51); a pressure relief cover (52), the pressure relief cover (52) being arranged at the middle portion of the inner wall of the first shell plate (11), the pressure relief cover (52) being in communication with the pressure relief chamber (511); A pressure relief device is provided outside the housing (1); the pressure relief cover (52), the pressure relief chamber (511) and the pressure relief device are connected in sequence.

7. The explosion-proof device for the cable intermediate joint according to claim 6, characterized in that: The pressure relief chamber (511) has a one-way flow portion (5111) inside, and its flow direction is from the pressure relief cover (52) to the pressure relief device.

8. The explosion-proof device for the cable intermediate joint according to claim 7, characterized in that: The pressure relief assembly (5) further comprises a plurality of pressure relief pipes (53), the pressure relief pipes (53) being connected to the pressure relief chamber (511) in a one-to-one correspondence, the end cover (2) being provided with a plurality of pressure relief holes (213) spaced circumferentially and corresponding to the pressure relief blocks (51), the pressure relief holes (213) being waist-shaped holes, the waist shape of the pressure relief holes (213) extending radially along the end cover (2), and the pressure relief pipes (53) passing through the corresponding pressure relief holes (213).

9. The explosion-proof device for cable intermediate joints according to claim 1, characterized in that: Heat dissipation strips (6) are arranged on the outer wall of the first shell plate (11).

10. The explosion-proof device for cable intermediate joints according to claim 9, characterized in that: The heat dissipation strip (6) extends along the length direction of the first shell (11).

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