Low-voltage branch box

Abstract

The invention discloses a low-voltage branch box, which relates to the technical field of power distribution network construction and comprises a box body, a bracket arranged in the box body, a wire inlet terminal and a wire outlet terminal which are arranged in the bracket, a disconnecting link assembly arranged in the bracket and a grounding body arranged on one side of the disconnecting link assembly, wherein the disconnecting link assembly can switch four stations. According to the invention, through arranging the disconnecting link assembly with four operation stations and the grounding body, during maintenance, an operator does not need to find and borrow a nonstandard temporary grounding body, does not need to damage a line insulation layer, and can safely and rapidly complete safe grounding of a wire inlet side or a wire outlet side only by operating the disconnecting link in the branch box; the electric shock risk caused by the fact that a ground wire cannot be installed on an urban hardened road surface and relying on non-standard metal component grounding is fundamentally solved, meanwhile, the operation potential safety hazard that an insulating layer needs to be stripped to hang the ground wire in a traditional mode is avoided, and the operation safety and efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of power distribution network construction technology, and in particular to a low-voltage branch box. Background Technology

[0002] In the actual operation and maintenance of low-voltage distribution networks, traditional low-voltage branch boxes have relatively limited functions, leading to safety and inefficiency issues in many on-site operations. During power outage maintenance on paved urban roads, difficulties in installing the working grounding wire often arise due to the inability to drive in grounding probes. Workers sometimes have to risk using nearby metal components as non-standard grounding electrodes, which not only violates safety regulations but also creates a risk of electric shock. Furthermore, low-voltage three-phase four-wire systems often suffer from insufficient repeated grounding of the neutral wire. When the neutral wire breaks, it can cause equipment burnout or even electric shock accidents. Although some improvements have been made to traditional low-voltage grounding wires in existing technologies, such as installing them on the three-phase line terminals at the lower end of the switch using parallel clamps, these are still external connection methods and cannot fundamentally solve the problems of grounding standardization, internalization, and controllability.

[0003] Therefore, there is an urgent need for a low-voltage branch box that can solve the above problems and achieve standardized working grounding and repeated neutral grounding, so as to improve the safety and reliability of the current urban low-voltage distribution network. Summary of the Invention

[0004] In view of the problems existing in the above or prior art, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a low-voltage branch box that solves the problems of not being able to install grounding probes and grounding wires on hardened urban roads and insufficient repeated grounding of neutral wires.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a low-voltage branch box, comprising a box body, a bracket disposed within the box body, and an inlet terminal and an outlet terminal disposed within the bracket for connecting the inlet cable and the outlet cable; The disconnector assembly is installed within the bracket, and the grounding electrode is installed on one side of the disconnector assembly; The disconnector assembly can switch between four positions: incoming and outgoing lines connected, incoming and outgoing lines disconnected, the incoming terminal side connected to the grounding electrode, and the outgoing terminal side connected to the grounding electrode.

[0007] As a preferred embodiment of the low-voltage branch box of the present invention, the disconnector assembly includes a drum, a conductive busbar disposed inside the drum, a parallel connector disposed outside the drum and connected to the grounding body, and a moving contact disposed outside the drum and connected to the conductive busbar.

[0008] By adopting a roller with built-in conductive busbar, external parallel connection, and moving contact, the knife switch operation is more compact and reliable. The rotation of the roller can drive the moving contact to make smooth and accurate contact with different points to achieve workstation switching. The circuit switching and grounding functions share the same roller, which is compact and synchronized in operation. It saves installation space in the box and avoids the risk of misoperation and failure rate caused by too many parts.

[0009] As a preferred embodiment of the low-pressure branch box of the present invention, the roller is provided with a rotating shaft through both ends of the bracket, and a rotating handle is provided on one end of the rotating shaft; By setting rotating shafts at both ends of the drum and configuring a rotating handle at one end, operators can directly and intuitively switch between four workstations without using other tools, thus improving the efficiency of on-site operations.

[0010] In a preferred embodiment of the low-voltage branch box of the present invention, the disconnector assembly further includes a conductive slide rail disposed on one side of the drum, the conductive slide rail being used to maintain the electrical connection between the parallel body and the grounding body during the rotation of the drum.

[0011] The conductive slide rail ensures that no matter how the drum rotates, the external parallel body and the grounding body always maintain a good electrical connection, which avoids grounding interruption due to rotation and ensures the continuous reliability of the grounding function. As a preferred embodiment of the low-pressure branch box, it further includes a limiting component, which includes an upper limit post disposed on the bracket, a limiting hole disposed on one side of the roller, and a guide groove. By using the limit pins, limit holes, and guide grooves, it can be ensured that the rotating drum can reach the designated position each time, ensuring complete contact between the moving and stationary contacts, preventing poor contact or functional errors caused by excessive rotation or incomplete positioning, and improving the accuracy of operation and the safety of the equipment. In a preferred embodiment of the low-pressure branch box, the limiting post is provided with an elastic element and a guide element.

[0012] The elastic element and guide element inside the limit post can provide the operator with a clear sense of position. When the guide element reaches the limit hole, the operator will have a clear feeling and will know that the knife switch has reached the predetermined position.

[0013] As a preferred embodiment of the low-voltage branch box of the present invention, it further includes a neutral wire connector, which, during normal operation of the low-voltage branch box, keeps the neutral wire phase electrically connected to the grounding body through the parallel connector, serving as a repeated grounding point for the neutral wire. By connecting the neutral wire phase through the neutral wire connector and linking it to the grounding electrode, a repeated grounding point for the neutral wire is formed in the branch box during normal operation. When a fault occurs in the main neutral wire, the risk of user-side electrical appliance burnout or electric shock caused by the neutral wire breakage can be greatly reduced, thus improving the safety level of the distribution network.

[0014] As a preferred embodiment of the low-voltage branch box of the present invention, at least one temporary power interface is further provided inside the box, and the temporary power interface is electrically connected to the incoming terminal or the outgoing terminal.

[0015] As a preferred embodiment of the low-voltage branch box of the present invention, the temporary power interface includes an access point for power supply guarantee and / or a power output point for construction power supply. By setting up a temporary power interface inside the enclosure and electrically connecting it to the incoming or outgoing terminals, there is no need to find additional power connection points or make temporary wiring when emergency power supply or on-site construction power is required. This avoids unauthorized wiring or live wire connection during on-site operations, improving the safety and response speed of temporary power supply.

[0016] The beneficial effects of this plan are: This invention, by setting up a knife switch assembly with four operating positions and a grounding electrode, eliminates the need for operators to find or borrow non-standard temporary grounding electrodes or damage the insulation layer of the lines during maintenance. They can safely and quickly complete the safe grounding of the incoming or outgoing side simply by operating the knife switch inside the branch box. This fundamentally solves the risk of electric shock caused by the inability to install grounding wires on hardened urban roads and the reliance on non-standard metal components for grounding. At the same time, it avoids the safety hazards of stripping the insulation layer to hang the grounding wire in the traditional method, thus improving the safety and efficiency of the operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the internal overall structure of a low-pressure branch box.

[0019] Figure 2 This is a schematic diagram of the disconnector assembly and bracket of a low-voltage branch box.

[0020] Figure 3 This is a side view of a switch assembly and bracket for a low-voltage branch box.

[0021] Figure 4for Figure 3 A schematic diagram of the AA cross-sectional structure.

[0022] Figure 5 This is a wiring diagram for a low-voltage branch box.

[0023] Figure 6 This is a diagram showing the connection status of the incoming and outgoing lines of a low-voltage branch box.

[0024] Figure 7 This is a diagram showing the disconnected inlet and outlet positions of a low-voltage branch box.

[0025] Figure 8 This is a diagram showing the grounding position status of the incoming side of a low-voltage branch box.

[0026] Figure 9 This is a diagram showing the grounding position status of the outgoing side of a low-voltage branch box.

[0027] 1. Housing; 2. Bracket; 3. Incoming terminal; 4. Outgoing terminal; 5. Knife switch assembly; 51. Roller; 52. Conductor busbar; 53. Parallel connector; 54. Moving contact; 55. Rotating shaft; 56. Rotating handle; 57. Conductive slide rail; 6. Grounding electrode; 7. Limiting assembly; 71. Limiting post; 72. Limiting hole; 73. Guide groove; 8. Neutral wire connector; 9. Temporary power interface; 10. Ammeter and voltmeter; 11. Neutral wire alarm light. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0031] Reference Figures 1-5 This is one embodiment of the present invention. This embodiment provides a low-voltage branch box, including a box body 1, a bracket 2 disposed in the box body 1, an inlet terminal 3 and an outlet terminal 4 disposed in the bracket 2, for connecting the inlet cable and the outlet cable. The disconnector assembly 5 is installed in the bracket 2, and the disconnector assembly 5 is located between the incoming terminal 3 and the outgoing terminal 4, and the grounding body 6 is installed on one side of the disconnector assembly 5; the grounding body 6 can be a steel rod.

[0032] The disconnector assembly 5 can switch between four positions: incoming and outgoing lines are connected, incoming and outgoing lines are disconnected, the incoming terminal 3 is connected to the grounding body 6, and the outgoing terminal 4 is connected to the grounding body 6.

[0033] It should be noted that, with Figures 6-9 For example, Figure 6 To ensure that the incoming and outgoing lines are aligned at approximately 90 degrees, the workstations are aligned. Figure 7 The position corresponding to the disconnection of the incoming and outgoing lines is approximately 45 degrees to the left or right. Figure 8 The grounding position on the incoming line side corresponds to approximately 0 degrees to the left. Figure 9 The grounding position on the outgoing side corresponds to approximately 0 degrees on the right. Compared to a traditional three-position grounding switch, the switch assembly 5 of this invention has four positions, which can meet the working grounding requirements of either the left or right side. This function makes the installation of working grounding wires easier and more flexible in actual maintenance work, greatly reducing the time spent on setting up safety measures during power outage maintenance and the labor intensity of workers. In addition, the integrated switch structure reduces the size of the switch and the space required for installation, which is beneficial for concentrating it in the housing 1. Grounding wires and grounding bodies 6 can be pre-installed when installing the branch box.

[0034] Figure 6 The specific operation is that the operator drives the drum 51 to rotate by rotating the handle 56. When the handle 56 is at about 90 degrees, the moving contact 54 on the conductive bar 52 simultaneously contacts the stationary contact of the inlet terminal 3 and the outlet terminal 4, and the inlet and outlet lines are connected. Figure 7 In order to be in Figure 6 Based on this, the operator drives the drum 51 to rotate left / right by rotating the handle 56 to rotate about 45 degrees to the limit hole 72, the moving contact 54 separates from the terminals on both sides, and the inlet and outlet lines are disconnected; Figure 8 and Figure 9 In order to be in Figure 7 Based on this, the operator drives the drum 51 to continue rotating to the left / right to about 0 degrees by rotating the handle 56, and the moving contact 54 on the connected body 53 contacts the stationary contact on the inlet / outlet side to achieve grounding on the inlet / outlet side.

[0035] Reference Figures 1-5This is a preferred embodiment of the present invention. Unlike the previous embodiment, the disconnector assembly 5 includes a roller 51, a conductive busbar 52 disposed within the roller 51, a connecting body 53 disposed outside the roller 51 and connected to the grounding body 6, and a moving contact 54 disposed outside the roller 51 and connected to the conductive busbar 52. The connecting body 53 also has a moving contact 54. The roller 51 is made of insulating material, such as insulating plastic.

[0036] Furthermore, the roller 51 has a rotating shaft 55 extending through the support 2 at both ends, and a rotating handle 56 is provided on the rotating shaft 55 at one end. It should be noted that a conductive busbar 52 is fixed inside the drum 51. The conductive busbar 52 passes through the drum 51 and connects to the moving contact 54. When the drum 51 rotates, the moving contact 54 can just contact the stationary contact on the outgoing terminal 4 and / or the incoming terminal 3 to achieve communication. The connecting body 53 is also provided with a moving contact 54. When the connecting body 53 rotates to the incoming terminal 3 or the outgoing terminal 4, it contacts the stationary contact on the outgoing terminal 4 or the incoming terminal 3 to achieve communication. In order to facilitate the contact between the moving contact 54 and the stationary contact, the incoming terminal 3 and the outgoing terminal 4 are composed of two spring pieces on the left and right. The distance between the two spring pieces is slightly smaller than that between the moving contact 54 and the moving contact 54. When the moving contact 54 enters, it can be clamped to achieve better contact. In order to facilitate the entry of the moving contact 54, the tops of the two spring pieces can be slightly expanded outward.

[0037] The bracket 2 has through holes at both ends for the rotating shaft 55 to rotate. The roller 51 is rotated by rotating the handle 56. When the roller 51 rotates, it will drive the moving contact 54 to contact different stationary contacts, which can switch different work positions and realize different working states.

[0038] Furthermore, the switch assembly 5 also includes a conductive slide rail 57 disposed on one side of the drum 51. The conductive slide rail 57 is used to maintain and connect the electrical connection between the drum 51 body 53 and the grounding body 6 during the rotation of the drum 51.

[0039] It should be noted that one side of the conductive slide rail 57 is fixedly connected to the bottom of the parallel body 53 and the roller 51, and rotates with the roller 51. The other side of the conductive slide rail 57 is connected to the bracket 2 through a conductive plate. One end of the conductive plate is connected to the grounding body 6, which is detachably connected to the conductive plate through a grounding terminal. To facilitate the rotation of the conductive slide rail 57 with the roller 51, corresponding grooves and protrusions can be provided on the conductive plate and the conductive slide rail 57. No matter how the roller 51 rotates, the parallel body 53, the conductive slide rail 57, and the grounding body 6 on the conductive plate are always connected, ensuring continuous grounding during rotation.

[0040] Reference Figures 1-5This is a preferred embodiment of the present invention. Unlike the previous embodiments, this embodiment also includes a limiting component 7. The limiting component 7 includes an upper limit post 71 disposed on the bracket 2, a limiting hole 72 disposed on one side of the roller 51, and a guide groove 73.

[0041] Furthermore, the limiting post 71 is equipped with elastic elements and guide elements.

[0042] It should be noted that in this embodiment, the elastic element is a helical spring, and the guide element is a steel ball. The steel ball is installed at one end of the helical spring, and the other end of the helical spring is fixed in the limiting post 71. When the rotating handle 56 is rotated, the steel ball will move in the guide groove 73. When it reaches the limiting hole 72, the steel ball will fall into the limiting hole 72 due to the deformation of the helical spring. This ensures that each rotation reaches the designated position and guarantees complete contact between the moving and stationary contacts. Other springs, such as compression springs or other structures with elastic deformation, can also be selected for the elastic element, depending on the actual situation. Other balls or other structures that facilitate movement within the guide groove 73 can also be selected for the guide element, depending on the actual situation. The elastic element and the guide element can be fixedly connected or detachably connected, depending on the actual situation.

[0043] Reference Figures 1-5 This is a preferred embodiment of the present invention. Unlike the previous embodiments, this embodiment also includes a neutral wire connector 8. When the low-voltage branch box is operating normally, the neutral wire connector 8 keeps the neutral wire phase connected to the grounding body 6 through the parallel connector 53, serving as a repeated grounding point for the neutral wire.

[0044] When the branch box circuit is working normally, the grounding wire and the neutral wire are always connected to the ground. At this time, the pre-set grounding wire can be used as a repeated grounding point for the neutral wire of the low-voltage three-phase four-line circuit, which can effectively prevent electric shock to personnel and damage to household appliances after the neutral wire is broken.

[0045] Reference Figure 1 This is a preferred embodiment of the present invention. The difference between this embodiment and the previous embodiment is that at least one temporary power interface 9 is also provided inside the housing 1. The temporary power interface 9 is electrically connected to the inlet terminal 3 or the outlet terminal 4. An insulating protective cover can be installed on the outside of the temporary power interface 9 to ensure safe use. Furthermore, the temporary power interface 9 includes an access point for power supply backup and / or a power output point for construction power supply.

[0046] Temporary power interface 9 can provide a temporary power access point for power supply guarantee; it can also be a temporary power acquisition point for construction, providing temporary power for construction.

[0047] Reference Figures 1-5This is a preferred embodiment of the present invention. Unlike the previous embodiments, the low-voltage branch box of the present invention is also equipped with an ammeter and voltmeter 10 and a neutral wire alarm light 11, which can realize the monitoring of voltage, current and neutral wire energization, and is used to observe the real-time status of low-voltage voltage, current and neutral wire energization.

[0048] When installing the branch box, a grounding wire and grounding electrode 6 are pre-installed. When the branch box circuit is working normally, the grounding wire and the neutral wire are always connected and grounded. At this time, the pre-installed grounding wire can serve as a repeated grounding point for the neutral wire of the low-voltage three-phase four-line circuit, which can effectively prevent electric shock to personnel and damage to household appliances after the neutral wire breaks. During power outage maintenance, the working grounding of any side of the branch box can be achieved through the knife switch assembly 5 inside the branch box. This effectively solves the long-standing problems of not being able to install grounding probes and grounding wires on hardened urban roads, the time-consuming and laborious process of installing grounding wires during power outage maintenance, and the safety hazards of needing to break the insulation layer to expose the conductor before installing grounding wires on low-voltage lines.

[0049] In addition, the low-voltage branch box is equipped with a temporary power supply interface 9, which can provide fast power access for power supply and provide temporary power for construction. On this basis, it can also be equipped with real-time monitoring of voltage, current and neutral wire energization, such as ammeter and voltmeter 10, neutral wire alarm light 11, etc., to facilitate real-time observation of voltage, current and neutral wire energization.

[0050] This invention can realize the opening and closing of the switch on either side and the working grounding requirement. In actual maintenance work, it makes the installation of working grounding wire easier and more flexible, greatly reducing the time for setting up safety measures during power outage maintenance and the labor intensity of the staff. The roller 51 structure greatly reduces the size of the switch and the installation space, making it easy to integrate into the branch box. To ensure the operating accuracy of the switch, a limit component 7 is set to ensure that each rotation can reach the designated position and ensure complete contact between the moving and stationary contacts.

[0051] Importantly, the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A low-voltage branch box, characterized in that: include, The enclosure (1), the bracket (2) set inside the enclosure (1), the inlet terminal (3) and the outlet terminal (4) set inside the bracket (2) are used to connect the inlet cable and the outlet cable; The disconnector assembly (5) is installed in the bracket (2), and the grounding body (6) is installed on one side of the disconnector assembly (5). The switch assembly (5) can switch between four positions: the incoming line and the outgoing line are connected, the incoming line and the outgoing line are disconnected, the incoming line terminal (3) is connected to the grounding body (6), and the outgoing line terminal (4) is connected to the grounding body (6).

2. The low-voltage branch box as described in claim 1, characterized in that: The disconnector assembly (5) includes a drum (51), a conductive bus (52) disposed inside the drum (51), a parallel body (53) disposed outside the drum (51) and connected to the grounding body (6), and a moving contact (54) disposed outside the drum (51) and connected to the conductive bus (52).

3. The low-voltage branch box as described in claim 2, characterized in that: The roller (51) has a rotating shaft (55) extending through the bracket (2) at both ends, and a rotating handle (56) is provided on one end of the rotating shaft (55).

4. The low-voltage branch box as described in claim 2, characterized in that: The switch assembly (5) further includes a conductive slide rail (57) disposed on one side of the drum (51), the conductive slide rail (57) being used to maintain the electrical connection between the parallel body (53) and the ground body (6) during the rotation of the drum (51).

5. The low-voltage branch box as described in claim 2, characterized in that: It also includes a limiting component (7), which includes a limiting post (71) disposed on the bracket (2), a limiting hole (72) disposed on one side of the roller (51), and a guide groove (73).

6. The low-voltage branch box as described in claim 5, characterized in that: The limiting post (71) is provided with an elastic element and a guide element.

7. The low-voltage branch box as described in claim 2, characterized in that: It also includes a neutral wire connector (8), which, when the low-voltage branch box is operating normally, keeps the neutral wire phase electrically connected to the grounding body (6) through the parallel connector (53), serving as a repeated grounding point for the neutral wire.

8. The low-voltage branch box as described in claim 1, characterized in that: The enclosure (1) is also provided with at least one temporary power interface (9), which is electrically connected to the incoming terminal (3) or the outgoing terminal (4).

9. The low-voltage branch box as described in claim 8, characterized in that: The temporary power interface (9) includes an access point for power supply and / or a power output point for construction power supply.

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