An electrical maintenance junction box with insulation protection function

Abstract

This utility model provides an electrical maintenance junction box with insulation protection function, relating to the field of electrical equipment technology. The junction box includes an outer box with a sealing cover on top. The outer wall of the outer box has inlet / outlet interfaces, with rubber rings fixed inside these interfaces. An inner box is located inside the outer box, with terminals on its inner side. The inner box is a one-piece three-layer composite structure, consisting of an inner lining layer, an insulation protection layer, and an outer protection layer from the inside out. A bottom pad is provided on the inner bottom surface of the outer box. A clamping mechanism is provided between the inner and outer boxes, cooperating with the bottom pad to clamp cables. By using the three-layer composite structure of the inner box and the cable clamping mechanism, multi-layer insulation protection is provided while ensuring mechanical strength and stable wiring, improving the safety and durability of the junction box in complex environments.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to an electrical maintenance junction box with insulation protection function. Background Technology

[0002] In the fields of power systems, industrial automation, and building electrical systems, junction boxes, as a fundamental and critical electrical auxiliary device, play a vital role in connecting, branching, transitioning, and protecting conductors. Especially in scenarios such as electrical equipment maintenance, temporary wiring installation, or system commissioning, junction boxes provide operators with a relatively centralized and safe connection point, effectively avoiding the potential risks associated with exposed conductor joints.

[0003] Traditional maintenance junction boxes are typically made of metal or ordinary engineering plastics, with their core functions being physical enclosure and basic electrical isolation. However, with the increasing complexity of electrical equipment and the ever-stricter requirements for operational safety, especially in industrial environments characterized by humidity, dust, corrosiveness, or accidental mechanical impact, the metal casing of traditional junction boxes poses risks of conductivity and corrosion. Meanwhile, plastic casings made of a single material may struggle to balance strength, toughness, and long-term insulation stability. Their simple structural design often cannot effectively address the hazards caused by internal arcing, condensation, cable stress relaxation, and frequent opening and closing for maintenance, resulting in low safety.

[0004] Therefore, in order to address the above problems, the applicant needs to design an electrical maintenance junction box with insulation protection function to solve the problem. Utility Model Content

[0005] This application provides an electrical maintenance junction box with insulation protection function, including an outer box body with a sealing cover on top. The outer box body has an inlet / outlet interface on its outer wall, and a rubber ring is fixedly installed inside the inlet / outlet interface. An inner box body is fixedly installed inside the outer box body, and a terminal block is installed inside the inner box body. The outer wall of the inner box body has a hole, and the hole is coaxial with the inlet / outlet interface. The inner box body is an integrally formed three-layer composite structure, and the three-layer composite structure consists of an inner lining layer, an insulation protection layer, and an outer protection layer from the inside to the outside. A bottom pad is provided on the inner bottom surface of the outer box body. A clamping mechanism is provided between the inner box body and the outer box body, and the clamping mechanism cooperates with the bottom pad to clamp cables.

[0006] Preferably, the inner lining is made of high-strength engineering plastic, the insulating protective layer is made of flexible insulating polymer material, and the outer protective layer is made of wear-resistant and impact-resistant engineering plastic. The use of high-strength engineering plastic in the inner lining enhances structural rigidity, the use of flexible insulating polymer material in the insulating protective layer provides excellent electrical insulation and cushioning performance, and the use of wear-resistant and impact-resistant engineering plastic in the outer protective layer improves overall durability and resistance to external impacts.

[0007] Preferably, the high-strength engineering plastic is polycarbonate, the flexible insulating polymer material is thermoplastic polyurethane elastomer, and the wear-resistant and impact-resistant engineering plastic is reinforced polypropylene.

[0008] Preferably, the clamping mechanism includes a clamping plate corresponding to the base pad, and a fixing block is fixedly disposed above the clamping plate. A threaded rod is fixedly disposed on the top surface of the fixing block, and a threaded sleeve is disposed on the outer side of the threaded rod. The clamping mechanism achieves reliable clamping of the cable through the cooperation of the clamping plate, the fixing block, the threaded rod and the threaded sleeve, preventing the cable from coming loose when vibrating or moving.

[0009] Preferably, a handle is fixedly provided at the end of the threaded sleeve away from the threaded rod, and the handle is used to drive the threaded sleeve to rotate. The handle facilitates manual rotation of the threaded sleeve, simplifies the clamping operation, and improves the efficiency of inspection and maintenance.

[0010] Preferably, a hollow sleeve is rotatably provided on the outer side of the threaded sleeve, and a fixing plate is fixedly provided on the outer side of the hollow sleeve. The two ends of the fixing plate are respectively connected to the inner wall of the outer box and the outer wall of the inner box. The connection structure of the hollow sleeve and the fixing plate enhances the overall stability of the clamping mechanism and avoids the threaded rod from shaking when the threaded sleeve rotates.

[0011] Preferably, a guide bar is slidably provided on the clamping plate, and the guide bar is connected to the inner wall of the outer box or the outer wall of the inner box. The sliding arrangement of the guide bar ensures the linearity and stability of the movement of the clamping plate and prevents skewing during the clamping process.

[0012] Preferably, a gasket is fixedly provided on the bottom surface of the clamping plate, and the gasket is made of silicone rubber. The silicone rubber gasket increases the friction and buffering effect between the clamping plate and the cable, effectively protecting the cable from mechanical damage.

[0013] This utility model provides an electrical maintenance junction box with insulation protection function, which, compared with the prior art: This electrical maintenance junction box with insulation protection securely holds the cable to the base pad via a clamping mechanism during cable connection. Simultaneously, the sealing cover and the rubber-ringed inlet / outlet interfaces work together to create a good external seal. Furthermore, when the wire is connected to the inner box, which is integrally molded from three layers of composite material, the inner lining provides stable structural support, the middle insulating layer ensures absolute electrical isolation, and the outer protective layer continuously resists external environmental impacts. The three layers work together to provide a safe environment for the electrical connection point, integrating mechanical protection, efficient sealing, and long-term stable insulation, thereby improving the junction box's safety and durability in complex environments. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the internal three-dimensional structure of the outer box of this utility model; Figure 3 This is a schematic diagram of the layered structure of the inner box of this utility model; Figure 4 This is a three-dimensional structural diagram of the clamping mechanism of this utility model; Figure 5 This utility model Figure 4 Enlarged structural diagram at point A in the middle.

[0016] icon: 1. Outer housing; 2. Inner housing; 10. Cable entry / exit interface; 11. Rubber ring; 12. Sealing cover; 13. Clamping mechanism; 14. Base pad; 15. Terminal block; 20. Hole; 21. Inner lining layer; 22. Insulating protective layer; 23. Outer protective layer; 130. Clamping plate; 131. Guide strip; 132. Fixing block; 133. Threaded rod; 134. Threaded sleeve; 135. Handle; 136. Hollow sleeve; 137. Fixing plate; 138. Gasket. Detailed Implementation

[0017] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0018] Please refer to Figures 1-5This utility model provides an electrical maintenance junction box with insulation protection function, including an outer box 1, with a sealing cover 12 on the top of the outer box 1. The outer wall of the outer box 1 has an inlet / outlet interface 10, and a rubber ring 11 is fixedly installed inside the inlet / outlet interface 10. An inner box 2 is fixedly installed inside the outer box 1, and a terminal block 15 is installed inside the inner box 2. The outer wall of the inner box 2 has a hole 20, which is coaxial with the inlet / outlet interface 10. The inner box 2 is an integrally formed three-layer composite structure, consisting of an inner lining layer 21, an insulating protective layer 22, and an outer protective layer 23 from the inside out. The inner bottom surface of body 1 is provided with a bottom pad 14. A clamping mechanism 13 is provided between the inner box 2 and the outer box 1. The clamping mechanism 13 and the bottom pad 14 cooperate to clamp the cable. The outer box 1 and the sealing cover 12 constitute the first level of physical protection. The wire is introduced through the inlet / outlet interface 10. The rubber ring 11 inside presses the cable to achieve preliminary sealing and stress buffering, preventing dust and moisture from entering and the cable from being pulled. The inner box 2 is the second protection. Its three-layer composite structure works together. The terminal block 15 is completely enclosed in this composite inner box 2. The wire enters the inner box 2 through the hole 20 coaxial with the interface of the outer box 1 for connection.

[0019] like Figure 3 As shown, the inner lining layer 21 is made of high-strength engineering plastic, the insulating protective layer 22 is made of flexible insulating polymer material, and the outer protective layer 23 is made of wear-resistant and impact-resistant engineering plastic. The high-strength engineering plastic is polycarbonate, the flexible insulating polymer material is thermoplastic polyurethane elastomer, and the wear-resistant and impact-resistant engineering plastic is reinforced polypropylene.

[0020] The polycarbonate inner liner 21, with its high strength, high rigidity and heat resistance, provides a stable mounting base for the terminal block 15, ensuring that the internal structure does not deform under electrical heating or slight external force.

[0021] The thermoplastic polyurethane elastomer insulating protective layer 22, with its excellent flexibility, high elastic recovery and inherent insulating properties, can deform and recover when subjected to internal or external compression, effectively absorb energy and always maintain a reliable insulating state.

[0022] The reinforced polypropylene outer protective layer 23 is usually reinforced by adding materials such as glass fiber to give it excellent impact resistance, rigidity and chemical corrosion resistance, and serves as the outermost layer to directly protect the inner structure.

[0023] like Figure 4 and Figure 5As shown, the clamping mechanism 13 includes a clamping plate 130 corresponding to the base pad 14, and a fixing block 132 is fixedly disposed above the clamping plate 130. A threaded rod 133 is fixedly disposed on the top surface of the fixing block 132, and a threaded sleeve 134 is disposed on the outer side of the threaded rod 133. A handle 135 is fixedly disposed at the end of the threaded sleeve 134 away from the threaded rod 133, and the handle 135 is used to drive the threaded sleeve 134 to rotate. A hollow sleeve 136 is rotatably disposed on the outer side of the threaded sleeve 134, and a fixing plate 137 is fixedly disposed on the outer side of the hollow sleeve 136. The two ends of the fixing plate 137 are respectively connected to the inner wall of the outer box 1 and the outer wall of the inner box 2. Rotating the handle 135 drives the threaded sleeve 134 to rotate. Since the threaded sleeve 134 is fixed between the outer box 1 and the inner box 2 through the hollow sleeve 136 and the fixing plate 137, its rotational motion is converted into the linear up-and-down movement of the threaded rod 133 through the inner thread, thereby firmly clamping the cable.

[0024] In order to enable the clamping plate 130 to move in a specific direction, a guide bar 131 is slidably provided on the clamping plate 130, and the guide bar 131 is connected to the inner wall of the outer box 1 or the outer wall of the inner box 2.

[0025] In order to increase the friction and buffering effect between the clamping plate 130 and the cable, and effectively protect the cable from mechanical damage, a gasket 138 is fixedly provided on the bottom surface of the clamping plate 130, and the gasket 138 is made of silicone rubber.

[0026] In summary, when using this electrical maintenance junction box with insulation protection, during line connection or maintenance, the wires first pass through the rubber ring 11 inside the inlet / outlet interface 10 of the outer box 1 and enter the inner box 2. Then, by rotating the handle 135 of the clamping mechanism 13, the threaded sleeve 134 is driven to rotate, which in turn causes the threaded rod 133 to drive the clamping plate 130 to move downward smoothly. Together with the bottom pad 14, the cable is firmly clamped to fix its position and relieve stress. Subsequently, the wires are connected to the terminal block 15 to complete the electrical connection. During this process, the sealing cover 12 and the outer box 1 are closed to form external protection, while the inner lining layer 21 of the inner box 2 provides structural support, the insulation protection layer 22 ensures high elasticity insulation, and the outer protection layer 23 resists physical impact. Together, they provide a centralized, safe, and long-term stable insulation protection environment for the electrical connection point.

[0027] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electrical maintenance junction box with insulation protection function, characterized in that: The outer box (1) is provided with a sealing cover (12) on top of the outer box (1). The outer wall of the outer box (1) is provided with an inlet / outlet interface (10), and a rubber ring (11) is fixedly provided inside the inlet / outlet interface (10). The inner box (2) is fixedly provided inside the outer box (1), and a terminal block (15) is provided inside the inner box (2). The outer wall of the inner box (2) is provided with a hole (20), and the hole (20) is coaxial with the inlet / outlet interface (10). The inner box (2) is an integrally formed three-layer composite structure, and the three-layer composite structure consists of an inner lining layer (21), an insulating protective layer (22), and an outer protective layer (23) from the inside to the outside. The bottom surface of the outer box (1) is provided with a bottom pad (14). A clamping mechanism (13) is provided between the inner box (2) and the outer box (1), and the clamping mechanism (13) and the bottom pad (14) cooperate to clamp the cable.

2. The electrical maintenance junction box with insulation protection function according to claim 1, characterized in that: The inner lining layer (21) is a high-strength engineering plastic, the insulating protective layer (22) is a flexible insulating polymer material, and the outer protective layer (23) is a wear-resistant and impact-resistant engineering plastic.

3. An electrical maintenance junction box with insulation protection function according to claim 2, characterized in that: The high-strength engineering plastic is polycarbonate, the flexible insulating polymer material is thermoplastic polyurethane elastomer, and the wear-resistant and impact-resistant engineering plastic is reinforced polypropylene.

4. An electrical maintenance junction box with insulation protection function according to claim 1, characterized in that: The clamping mechanism (13) includes a clamping plate (130) corresponding to the bottom pad (14), and a fixing block (132) is fixedly provided above the clamping plate (130). A threaded rod (133) is fixedly provided on the top surface of the fixing block (132), and a threaded sleeve (134) is provided on the outside of the threaded rod (133).

5. An electrical maintenance junction box with insulation protection function according to claim 4, characterized in that: A handle (135) is fixedly provided at the end of the threaded sleeve (134) away from the threaded rod (133), and the handle (135) is used to drive the threaded sleeve (134) to rotate.

6. An electrical maintenance junction box with insulation protection function according to claim 4, characterized in that: A hollow sleeve (136) is rotatably provided on the outer side of the threaded sleeve (134), and a fixing plate (137) is fixedly provided on the outer side of the hollow sleeve (136), and the two ends of the fixing plate (137) are respectively connected to the inner wall of the outer box (1) and the outer wall of the inner box (2).

7. An electrical maintenance junction box with insulation protection function according to claim 4, characterized in that: A guide bar (131) is slidably provided on the clamping plate (130), and the guide bar (131) is connected to the inner wall of the outer box (1) or the outer wall of the inner box (2).

8. An electrical maintenance junction box with insulation protection function according to claim 4, characterized in that: A gasket (138) is fixedly provided on the bottom surface of the clamping plate (130), and the gasket (138) is made of silicone rubber.

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