High-voltage cable intermediate joint protection box

Abstract

The utility model discloses a high-voltage cable intermediate joint protection box, which belongs to the technical field of joint protection boxes and comprises a first protection box, a second protection box, two connecting assemblies and two sealing assemblies. The two connecting assemblies are arranged at the two ends of the first protection box respectively, the first connecting sleeve and the second connecting sleeve are rotationally connected and can be connected and closed through bolts, clamping rings are fixed to ports of the first protection box and the second protection box, the first connecting sleeve and the second connecting sleeve clamp the clamping rings through clamping grooves, and therefore detachable connection of the connecting assemblies is achieved. The sealing assemblies used for achieving sealing with the surfaces of the cables are fixed to the outer side ports of the first connecting sleeve and the second connecting sleeve, when cables of different specifications are dealt with, only the connecting assemblies need to be detached and replaced with the cables of different models, the first protection box and the second protection box do not need to be replaced, and therefore the stocking cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of joint protection boxes, and more specifically, to a high-voltage cable intermediate joint protection box. Background Technology

[0002] The explosion-proof box for intermediate connection points of high-voltage cables is a safety device specifically designed to protect intermediate joints (such as straight joints, branch joints, etc.) of high-voltage cables. Its main function is to prevent the explosion energy and electric arc from spreading outward when the joint is damaged by a fault (such as short circuit, overload, insulation aging, etc.), thereby ensuring the safety of surrounding equipment and personnel. It is usually made of flame-retardant materials (such as glass fiber reinforced plastic, stainless steel, etc.) and can withstand high-temperature flames.

[0003] Chinese Patent Announcement No. CN220732343U provides a cable intermediate joint explosion-proof box. This solution connects the upper and lower explosion-proof box bodies into a whole by using a bolt assembly to connect the first and second flanges. The two cables to be connected enter the sealed cavity through the connection holes on both sides of the explosion-proof box to form a cable intermediate joint. The cable intermediate joint is stored and sealed in the explosion-proof box. High-voltage cable sealant is injected into the sealed cavity through a connecting pipe. The high-voltage cable sealant and the sealing ring work together to prevent the cable intermediate joint from being submerged in water or getting damp, which could increase resistance and cause the cable intermediate joint to heat up and explode.

[0004] The diameter of the cable joint protection box gradually decreases from the middle to both sides. The diameter of both ends needs to match the cable to achieve a seal. Due to the inconsistent outer diameter of the cables, the above solution and the existing protection boxes require different protection boxes for different cable specifications. Too many models will increase the inventory cost.

[0005] Therefore, a high-voltage cable intermediate joint protection box is proposed to address the above problems. Utility Model Content

[0006] 1. Technical problems to be solved

[0007] This utility model provides a high-voltage cable intermediate joint protection box, which can improve the problems existing in related technologies: the diameter of the cable joint protection box gradually decreases from the middle to both sides, and the diameter specifications of its two ends need to match the cable to achieve a seal. Since the outer diameter of the cable is not consistent, different specifications of protection boxes need to be replaced for different specifications of cables, and too many models will increase the cost of stocking.

[0008] 2. Technical Solution

[0009] To solve the above problems, the present invention adopts the following technical solution.

[0010] This application provides a high-voltage cable intermediate joint protection box, including: a first protection box, a second protection box, two connecting components, and two sealing components. The first and second protection boxes cooperate to enclose the cable joint. The two connecting components are respectively disposed at both ends of the first protection box. Each connecting component includes a first connecting sleeve, a second connecting sleeve, and two retaining rings. The two retaining rings are respectively installed at one end of the first and second protection boxes. The inner sides of the first and second connecting sleeves are provided with grooves that are adapted to the retaining rings. The sealing components include two sealing rings, and sealing rings are fixedly installed on the inner sides of the two sealing rings. The first and second connecting sleeves are detachably installed on the first and second protection boxes through the grooves and the retaining rings. The sealing rings are tightly attached to the outer surface of the cable to form a seal.

[0011] The technical solutions described in this application embodiment have at least the following technical effects:

[0012] Connecting sleeve one and connecting sleeve two are rotatably connected and can be closed by bolts. A retaining ring is fixed to the port of both protective boxes. Connecting sleeve one and connecting sleeve two are secured to the retaining ring via a retaining groove, thus achieving a detachable connection of the connecting components. A sealing component for sealing with the cable surface is fixed to the outer port of connecting sleeve one and connecting sleeve two. When dealing with cables of different specifications, only the connecting components need to be removed and replaced with different models; there is no need to replace protective boxes one and two, thereby reducing inventory costs.

[0013] In some embodiments, side plates are fixedly installed on both sides of the first protective box and the second protective box, the first protective box and the second protective box are connected by the side plates, and a sealing strip is provided between the first protective box and the second protective box. A support component is provided on the inner side of the second protective box.

[0014] In some embodiments, the protective box includes a middle section box, with extension boxes fixedly connected to both ends of the middle section box, and a tail end box fixedly connected to one end of the extension box. Reinforcing ribs are fixedly installed at the outer ends of both the middle section box and the extension box.

[0015] In some embodiments, two glue injection ports are installed on the outer end of the middle section box, the glue injection ports are connected to the inside of the middle section box, and a sealing cap is threaded to the top of the glue injection port.

[0016] In some embodiments, the support assembly includes equidistant support plates connected to each other by connecting strips, and the support plates are fixedly installed inside the second protective box.

[0017] In some embodiments, one end of the connecting sleeve one and the connecting sleeve two are rotatably connected, and the other end of the connecting sleeve one and the connecting sleeve two are fixedly installed with a connecting plate. The outer end of the connecting plate is provided with a bolt hole, and the cross section of the retaining ring is arranged in an isosceles trapezoidal shape.

[0018] In some embodiments, the two sealing rings are respectively fixedly installed inside the connecting sleeve one and the connecting sleeve two. The outer ends of the sealing rings are fixedly installed with equally spaced extension claws. The extension claws are inclined. One end of the extension claw is fixedly connected to a pressing block. The outer end of the pressing block is provided with anti-slip texture. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of protective box one and protective box two of this utility model;

[0021] Figure 3 This is a schematic diagram of the support component structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the connection component structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the sealing component structure of this utility model.

[0024] Explanation of the labels in the diagram:

[0025] 1. Protective box one; 11. Middle section box; 12. Extension box; 13. Tail end box; 14. Reinforcing rib;

[0026] 2. Protective Box Two;

[0027] 3. Side panels;

[0028] 4. Injection port;

[0029] 5. Sealing cap;

[0030] 6. Connecting components; 61. Connecting sleeve one; 62. Connecting sleeve two; 63. Connecting plate; 64. Snap ring; 65. Snap groove;

[0031] 7. Sealing assembly; 71. Sealing ring; 72. Extension claw; 73. Pressing block; 74. Anti-slip texture; 75. Sealing ring;

[0032] 8. Support components; 81. Support plate; 82. Connecting strip. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0034] Please see Figure 1 - Figure 5 A high-voltage cable intermediate joint protection box includes: a first protection box 1, a second protection box 2, two connecting components 6, and two sealing components 7. The first protection box 1 and the second protection box 2 cooperate to wrap the cable joint. The two connecting components 6 are respectively disposed at both ends of the first protection box 1. The connecting component 6 includes a first connecting sleeve 61, a second connecting sleeve 62, and two retaining rings 64. The two retaining rings 64 are respectively installed at one end of the first protection box 1 and the second protection box 2. The inner sides of the first connecting sleeve 61 and the second connecting sleeve 62 are provided with grooves 65 that are adapted to the retaining rings 64. The sealing components 7 include two sealing rings 71. The inner sides of the two sealing rings 71 are fixedly installed with sealing rings 75. The first connecting sleeve 61 and the second connecting sleeve 62 are detachably installed on the first protection box 1 and the second protection box 2 through the grooves 65 and the retaining rings 64. The sealing rings 75 are tightly attached to the outer surface of the cable to form a seal.

[0035] Side plates 3 are fixedly installed on both sides of both protective boxes 1 and 2. Protective boxes 1 and 2 are connected by side plates 3, and a sealing strip is provided between them. A support component 8 is provided inside the protective box 2.

[0036] The device in this solution is mainly used to protect the joint area in the middle of high-voltage cables. Protective box 1 and protective box 2 are used together. The diameter of protective box 1 and protective box 2 gradually decreases from the middle to both sides. Because the cable requires a joint, tape wrapping, and armor layer during connection, the diameter of the joint area is larger than the diameter of the cable itself. The thicker area in the middle is used to accommodate the joint. Side plates 3 are fixed on both sides of protective box 1 and protective box 2. Multiple equidistant through holes are opened on the side plates 3. After protective box 1 and protective box 2 are put together, they can be connected using bolts and nuts to enclose the cable internally and isolate it from the external environment. A sealing strip is also installed between protective box 1 and protective box 2 to increase the airtightness. Protective box 1 and protective box 2 are made of insulating, waterproof, and explosion-proof materials, such as stainless steel, aluminum alloy, or composite materials like glass fiber reinforced epoxy resin.

[0037] Both ends of the protective box 1 and the protective box 2 are equipped with detachable connecting components 6. Connecting sleeve 1 61 and connecting sleeve 2 62 are rotatably connected to each other and can be closed by bolts. A retaining ring 64 is fixed on the port of the protective box 1 and the protective box 2. The connecting sleeve 1 61 and the connecting sleeve 2 62 are locked with the retaining ring 64 by the retaining groove 65, thus realizing the detachable connection of the connecting components 6. A sealing component 7 for sealing with the cable surface is fixed on the outer port of the connecting sleeve 1 61 and the connecting sleeve 2 62. When dealing with cables of different specifications, it is only necessary to remove the connecting components 6 and replace them with different models. There is no need to replace the protective boxes 1 and 2. The factory only needs to produce protective boxes 1 and 2 of the same specifications, which improves efficiency and reduces production costs. Then, it can produce connecting components 6 and sealing components 7 of different specifications to match them.

[0038] Please see Figure 1 and Figure 2 The protective box 1 includes a middle section box 11, with extension boxes 12 fixedly connected to both ends of the middle section box 11, and a tail end box 13 fixedly connected to one end of the extension box 12. Reinforcing ribs 14 are fixedly installed on the outer ends of both the middle section box 11 and the extension box 12.

[0039] Two glue injection ports 4 are installed on the outer end of the middle section box 11. The glue injection ports 4 are connected to the inside of the middle section box 11, and a sealing cap 5 is threaded on the top of the glue injection port 4.

[0040] The protective box 1 and the protective box 2 in this solution have the same structure, both of which are composed of three sections. The protective box 1 consists of a middle section box 11, an extension box 12 and a tail end box 13. The middle section box 11 has the largest diameter and is located in the middle. The two extension boxes 12 are connected to the two ends of the middle section box 11. The tail end box 13 is fixed to the end of the extension box 12. The tail end box 13 is mainly used to install the connecting component 6.

[0041] Multiple equidistant reinforcing ribs 14 are fixed at the outer ends of the middle section box 11 and the extension box 12, and are also distributed on the second protective box 2. They are mainly used to increase the structural strength of the box under pressure. Two glue injection ports 4 are installed on the top of the middle section box 11. The glue injection ports 4 are connected to the inside of the first protective box 1 and are mainly used to inject glue into the inside. A sealing cap 5 is threaded to the top of the glue injection port 4.

[0042] After connecting the protection box 1 and the protection box 2 together, glue can be injected into the interior through one of the glue injection ports 4. The other glue injection port 4 is used to vent air during glue injection. The glue injection is mainly to eliminate the risk of partial discharge. After filling the interior of the protection box 1 and the protection box 2, it can be left to solidify and completely wrap the cable joint. Because the cable joint is prone to local high field strength due to electric field distortion such as conductor break or semiconductor layer break, if there are air gaps or impurities, it will cause partial discharge and gradually corrode the insulation material. The glue such as epoxy resin and silicone rubber completely fills the gap of the joint, avoids electric field concentration, and can also resist water vapor and chemical corrosion. It is the current mainstream technical method.

[0043] Please see Figure 2 and Figure 3 The support assembly 8 includes equidistantly distributed support plates 81, which are connected to each other by connecting strips 82. The support plates 81 are fixedly installed inside the protective box 2.

[0044] In this solution, the support component 8 is installed inside the second protective box 2. The support component 8 is mainly composed of multiple support plates 81 and multiple connecting strips 82. The multiple support plates 81 are connected to each other through multiple connecting strips 82. The support plates 81 are arc-shaped and are mainly used to support cable joints. Since the cable has a large self-weight, by installing the support component 8 inside the second protective box 2 and supporting the cable joints on the support component 8, the cable can be positioned in the middle, preventing the cable from pressing against the second protective box 2 during glue application.

[0045] Please see Figure 4 and Figure 5 Connecting sleeve 61 and connecting sleeve 62 are rotatably connected at one end, and connecting plate 63 is fixedly installed at the other end of both connecting sleeve 61 and connecting sleeve 62. Bolt holes are provided at the outer end of connecting plate 63, and the cross section of retaining ring 64 is set in an isosceles trapezoid.

[0046] In this design, the connecting component 6 is mainly used to install the sealing component 7 at both ends of the protective box 1 and the protective box 2. One end of the connecting sleeve 1 61 and the connecting sleeve 2 62 are rotatably connected to each other. Both the connecting sleeve 1 61 and the connecting sleeve 2 62 are semi-circular. The other end of the connecting sleeve 1 61 and the connecting sleeve 2 62 are fixed with a connecting plate 63. The connecting plate 63 is provided with bolt holes so that the connecting sleeve 1 61 and the connecting sleeve 2 62 can be connected by bolts. Two retaining rings 64 are respectively fixed to the protective box 1 and the protective box 2. At the end, that is, on the tail box 13, the inner side of the connecting sleeve 61 has a groove 65. The groove 65 is circular, and the cross-section of the retaining ring 64 is an isosceles trapezoid, that is, the thickness gradually increases from the outside to the inside. The thickest part of the retaining ring 64 is larger than the groove 65. With this design, when the groove 65 locks the retaining ring 64, the retaining ring 64 can be tightly locked inside the groove 65, which not only improves the connection strength, but also increases the sealing performance, preventing leakage during glue filling and forming the first layer of sealing.

[0047] Please see Figure 4 and Figure 5 Two sealing rings 71 are fixedly installed inside the connecting sleeve 1 61 and connecting sleeve 2 62 respectively. The outer end of the sealing ring 71 is fixedly installed with equally spaced extension claws 72. The extension claws 72 are inclined. One end of the extension claw 72 is fixedly connected to a pressing block 73. The outer end of the pressing block 73 is provided with anti-slip texture 74.

[0048] The sealing component 7 in this solution is mainly composed of two symmetrical structures. Both sealing rings 71 are semi-circular rings, which are fixed to the inner sides of connecting sleeve 1 61 and connecting sleeve 2 62 respectively. A sealing ring 75 is fixed inside the sealing ring 71. When the sealing ring 75 comes into contact with the cable surface, it can form a secondary seal to prevent leakage during glue filling. On the outer side of the sealing ring 71, multiple annularly distributed extension claws 72 are fixed. The multiple extension claws 72 are inclined towards the center. The sealing component 7 is made of plastic so that it can deform outward when wrapping the cable, so that the pressure block 73 fixed at the end of the extension claw 72 can fit tightly against the surface of the cable. The anti-slip texture 74 set on the pressure block 73 is used to increase the friction.

[0049] During construction and installation, even with a sealed structure, insulating and waterproof tape still needs to be wrapped around the port. However, the existing protective boxes have cables wrapped around their ports, and the ports have a thickness that creates a significant drop from the cable surface. When the tape is wrapped around the port, this drop prevents the tape from completely covering the cable. This solution uses multiple inclined extension claws 72 to create a slope-like structure on the cable surface and at the port, allowing the tape to gradually wrap from the cable surface to protective boxes 1 and 2, providing a transition and increasing the sealing of the tape wrapping.

[0050] Working principle: In this solution, the cable connection points need to be wrapped with tape before installation. Then, protective box 1 and protective box 2 are placed over the cable connection points and connected with bolts. Then, connecting sleeve 1 61 and connecting sleeve 2 62 are connected with bolts. When the slot 65 locks the retaining ring 64, the retaining ring 64 can be tightly locked inside the slot 65. Then, when the sealing ring 75 inside the sealing ring 71 comes into contact with the cable surface, a seal is formed to prevent leakage during glue filling.

Claims

1. A protective box for a high-voltage cable intermediate joint, characterized in that, include: Protective box one (1) and protective box two (2), the protective box one (1) and protective box two (2) cooperate to wrap the cable connector; Two connecting components (6) are respectively disposed at both ends of the first protective box (1). The connecting components (6) include a first connecting sleeve (61), a second connecting sleeve (62) and two retaining rings (64). The two retaining rings (64) are respectively installed at one end of the first protective box (1) and the second protective box (2). The inner sides of the first connecting sleeve (61) and the second connecting sleeve (62) are provided with retaining grooves (65) that are compatible with the retaining rings (64). Two sealing components (7), each sealing component (7) includes two sealing rings (71), and a sealing ring (75) is fixedly installed on the inner side of each of the two sealing rings (71); The connecting sleeve one (61) and connecting sleeve two (62) are detachably installed on the protective box one (1) and the protective box two (2) through the cooperation of the slot (65) and the retaining ring (64), and the sealing ring (75) is tightly attached to the outer surface of the cable to form a seal.

2. The high-voltage cable intermediate joint protection box according to claim 1, characterized in that: Side plates (3) are fixedly installed on both sides of the first protective box (1) and the second protective box (2). The first protective box (1) and the second protective box (2) are connected by the side plates (3). A sealing strip is provided between the first protective box (1) and the second protective box (2). A support component (8) is provided inside the second protective box (2).

3. A high-voltage cable intermediate joint protection box according to claim 1, characterized in that: The protective box (1) includes a middle section box (11), both ends of which are fixedly connected to an extension box (12), and one end of the extension box (12) is fixedly connected to a tail end box (13). The outer ends of the middle section box (11) and the extension box (12) are both fixedly installed with reinforcing ribs (14).

4. A high-voltage cable intermediate joint protection box according to claim 3, characterized in that: Two glue injection ports (4) are installed on the outer end of the middle section box (11). The glue injection ports (4) are connected to the inside of the middle section box (11). A sealing cap (5) is threadedly connected to the top of the glue injection port (4).

5. A high-voltage cable intermediate joint protection box according to claim 2, characterized in that: The support assembly (8) includes equidistant support plates (81), which are connected to each other by connecting strips (82). The support plates (81) are fixedly installed inside the second protective box (2).

6. A high-voltage cable intermediate joint protection box according to claim 1, characterized in that: The first connecting sleeve (61) and the second connecting sleeve (62) are rotatably connected at one end, and the other end of the first connecting sleeve (61) and the second connecting sleeve (62) are fixedly installed with a connecting plate (63). The outer end of the connecting plate (63) is provided with a bolt hole, and the cross section of the retaining ring (64) is set in an isosceles trapezoid.

7. A high-voltage cable intermediate joint protection box according to claim 1, characterized in that: The two sealing rings (71) are respectively fixedly installed inside the connecting sleeve one (61) and the connecting sleeve two (62). The outer end of the sealing ring (71) is fixedly installed with equally spaced extension claws (72). The extension claws (72) are inclined. One end of the extension claw (72) is fixedly connected to a pressing block (73). The outer end of the pressing block (73) is provided with anti-slip texture (74).

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