A quick-mounting arc-resistant ring main unit with a lower cabinet door installed with a hook lock

Abstract

The utility model belongs to the technical field of power distribution equipment, disclose a kind of fast -assembled type arc -resistant ring main unit of hook locking installation lower cabinet door.The ring main unit includes cable chamber, lower cabinet door component;The cable chamber left side plate of cable chamber, the right side plate of cable chamber are all provided with multiple rectangular mounting holes;The cable chamber upper crossbeam of cable chamber, cable chamber lower crossbeam are all provided with multiple T-shaped holes;Lower cabinet door component's lower cabinet door upper portion plug-in board, lower cabinet door lower portion plug-in board are all installed with multiple T-shaped plugs that protrude outward;T-shaped plug and T-shaped hole plug-in cooperation;Lower cabinet door component's lower cabinet door right side hook plate, lower cabinet door left side hook plate are all provided with multiple hooks;Hook and mounting hole hang cooperation.The utility model designs a kind of door body fixing mechanism that can be more reliable, more evenly bear and disperse impact force under arc burning fault, ensure that lower cabinet door cannot be rushed open.Improve the environmental adaptability and reliability of product.

Description

Technical Field

[0001] This utility model belongs to the field of power distribution equipment technology, and in particular relates to a quick-installation fire-resistant arc ring main unit with a lower cabinet door equipped with a hook for locking. Background Technology

[0002] In power distribution network systems, ring main units (RMMs) are critical equipment, and their safety and reliability are of paramount importance. The cable compartment of the RMM is the core area for installing cable accessories, current transformers, and conducting line commissioning. Therefore, the lower door of the RMM needs to be removable and reassembleable to meet the needs of on-site construction and subsequent operation and maintenance.

[0003] Currently, there are two main types of bottom door structures commonly found in the industry for ring main units: (1) Embedded structure: The lower cabinet door is embedded in the cabinet frame, and the sealing and IP protection level are achieved by relying on the surrounding sealing strip. This structure has extremely high requirements for the processing accuracy and dimensional tolerance of the cabinet and door panels. During long-distance transportation or installation, if the cabinet is slightly deformed, the door panel may jam and be difficult to disassemble.

[0004] (2) Bolted fixing structure: The lower cabinet door is directly fastened to the side plate and crossbeam of the cable compartment by multiple bolts (usually ten or more) distributed around the perimeter. Although this structure can meet the requirements of sealing and mechanical strength well, it has significant drawbacks in field operation. For example, in humid or corrosive environments, the bolts are prone to rusting and seizing; frequent disassembly and assembly can easily lead to stripped threads; disassembling all the bolts is time-consuming and labor-intensive, which greatly reduces the efficiency of operation and maintenance.

[0005] Furthermore, according to relevant standards (such as IEC62271-200), ring main units need to have a certain level of internal fault arc protection capability (arc protection). When an internal arc occurs in the cable compartment, it generates enormous instantaneous pressure and impact force. Although the existing bolt fixing structure can provide a certain strength, the bolts themselves are weak points where stress is concentrated. In extreme cases, they may be pulled apart or sheared, causing the lower cabinet door to be forced open, triggering a secondary accident and threatening personal and equipment safety.

[0006] Therefore, there is an irreconcilable contradiction between the ease of disassembly and assembly and the structural reliability under extreme working conditions in the lower cabinet doors of existing ring main units.

[0007] Based on the above analysis, the problems and shortcomings of the existing technology are as follows: Low disassembly and assembly efficiency: It relies on a large number of bolts for fixing, and the disassembly and installation process is cumbersome, requiring many tool operations, which seriously affects the efficiency of on-site operation and maintenance.

[0008] Poor maintainability: Bolts are prone to rust and stripping in harsh environments, making disassembly difficult and even requiring destructive removal, which increases maintenance costs and difficulty.

[0009] Sensitive to cabinet deformation: Whether recessed or bolted, the installation accuracy is highly dependent on the cabinet's geometry. Deformation during transportation or installation can easily prevent the door panels from being installed or removed properly.

[0010] The reliability of arc flash protection is questionable: In the event of an internal arc flash failure, the bolt connection points become the main force and load transmission paths. The stress on multiple bolts may be uneven, and the failure of one or more bolts may trigger a chain reaction, causing the entire door to be blown open, resulting in insufficient protection reliability.

[0011] Complex structure and high cost: It requires machining a large number of threaded holes and equipping a large number of bolts, which increases manufacturing costs and material management costs. Utility Model Content

[0012] To overcome the problems existing in related technologies, this utility model discloses a quick-installation fire-resistant arc-damped ring main unit with a lower cabinet door equipped with a hook locking mechanism. In particular, it relates to a quick-installation ring main unit door structure resistant to arc-damped fire impact.

[0013] The technical solution is as follows: A quick-installation fire-resistant arc ring main unit with a lower cabinet door equipped with a hook lock, including a ring main unit cabinet body. The ring main unit cabinet body is composed of a cable compartment, a switch compartment, a mechanism compartment, a control box compartment, a control box panel, a mechanism compartment panel, and a lower cabinet door assembly, which are fixedly connected together. Multiple rectangular mounting holes are provided on the left side plate and the right side plate of the cable compartment. Multiple T-shaped holes are provided on both the upper and lower crossbeams of the cable compartment; The upper and lower insert plates of the lower cabinet door assembly are each equipped with multiple outwardly protruding T-shaped plugs; the T-shaped plugs are inserted into the T-shaped holes. Multiple hooks are provided on both the right-side hook plate and the left-side hook plate of the lower cabinet door assembly; the hooks are engaged with the mounting holes.

[0014] Furthermore, the cable compartment also includes a left side panel and a right side panel. The upper and lower ends of the left and right sides of the cable compartment are fixedly connected by the upper and lower crossbeams of the cable compartment, respectively; cable compartment skirt plates are fixedly connected to both the left and right sides of the cable compartment; and the top skirt plate of the cable compartment is fixedly connected to the upper crossbeam of the cable compartment.

[0015] The lower cabinet door assembly also includes the lower cabinet door handle, the lower cabinet door interlock plate, and the lower cabinet door; The lower cabinet door handle is installed on the upper part of the lower cabinet door, and the upper and lower parts of the lower cabinet door body are respectively installed with upper and lower cabinet door inserts.

[0016] A lower cabinet door interlock plate is installed at the lower end of the upper insert plate of the lower cabinet door; The lower cabinet door panel is made of flame-retardant board; Fastening bolts that penetrate the flame-retardant plate are provided on the upper part of the upper plate of the lower cabinet door and the upper part of the lower plate of the lower cabinet door.

[0017] The hook plate on the right side of the lower cabinet door and the hook plate on the left side of the lower cabinet door are installed on the right and left sides inside the lower cabinet door, respectively.

[0018] Fasteners that penetrate the flame-retardant plate are installed on the flame-retardant plate.

[0019] The mounting holes are rectangular.

[0020] Combining all the above technical solutions, the beneficial effects of this utility model are as follows: It resolves the contradiction between rapid assembly and disassembly and structural stability: it provides a structure that enables both rapid installation and disassembly of the lower cabinet door, while achieving connection strength comparable to traditional multi-bolt fixings when closed.

[0021] It solves the problem of disassembly difficulties caused by corrosion: it significantly reduces the number of bolts that must be used and lowers the probability of disassembly being affected by corrosion of threaded connections.

[0022] Enhanced internal arc protection capability: A door fixing mechanism is designed to more reliably and evenly withstand and disperse impact forces in the event of an arc failure, ensuring that the lower cabinet door will not be forced open.

[0023] Improved adaptability to cabinet deformation: Reduces the sensitivity of the lower cabinet door installation to the overall cabinet processing precision and deformation, thereby improving the product's environmental adaptability and reliability. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure; Figure 1 This is a diagram of a quick-installation fireproof arc ring mesh cabinet with a lower cabinet door equipped with a hook locking mechanism, provided by an embodiment of this utility model; Figure 2 This is a schematic diagram of the various structures of the cable compartment provided in this embodiment of the utility model; Figure 3 This is a schematic diagram of the lower cabinet door assembly provided in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the outer side of the lower cabinet door assembly provided in this embodiment of the utility model; In the diagram: 1. Ring main unit cabinet; 2. Cable compartment; 210. Left side panel of cable compartment; 220. Upper crossbeam of cable compartment; 230. Right side panel of cable compartment; 240. Lower crossbeam of cable compartment; 250. Skirt panel of cable compartment; 260. Top skirt panel of cable compartment; 270. Mounting hole; 280. T-hole; 3. Switch compartment; 4. Mechanism compartment; 5. Control box compartment; 6. Control box panel; 7. Mechanism compartment panel; 8. Lower cabinet door assembly; 801. Lower cabinet door handle; 802. Lower cabinet door interlocking plate; 803. Lower cabinet door; 804. Flame retardant plate; 805. Right side hook plate of lower cabinet door; 806. Fastener; 807. Fastening bolt; 808. Lower insert plate of lower cabinet door; 809. Left side hook plate of lower cabinet door; 810. Upper insert plate of lower cabinet door; 811. T-plug; 812. Hook. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0026] Example 1, as Figures 1-4 As shown, the quick-install fireproof arc ring main unit with a lower cabinet door equipped with a hook lock provided in this embodiment of the utility model includes a ring main unit cabinet body 1, which is mainly composed of a cable compartment 2, a switch compartment 3, a mechanism compartment 4, a control box compartment 5, a control box panel 6, a mechanism compartment panel 7, and a lower cabinet door assembly 8, which are fixedly connected together.

[0027] A switch chamber 3 is installed above the rear of the cable chamber 2, and a mechanism chamber 4 is installed above the front of the cable chamber 2. The mechanism chamber 4 and the switch chamber 3 are fixedly connected together.

[0028] The control box 5 is installed on top of the mechanism room 4. Inside the control box 5 are various secondary components that monitor and control the various states of the ring main unit.

[0029] The control panel 6 is installed at the front of the control box compartment 5, protecting the secondary components inside the control box compartment 5.

[0030] The mechanism chamber panel 7 is installed at the front of the mechanism chamber 4, which protects and seals the operating mechanism inside the mechanism chamber 4.

[0031] like Figure 2As shown, the cable compartment 2 is mainly composed of a left side panel 210, an upper crossbeam 220, a right side panel 230, a lower crossbeam 240, a skirt panel 250, and a top skirt panel 260, which are assembled together by a fixed connection.

[0032] The upper and lower ends of the left side plate 210 and the right side plate 230 of the cable compartment are fixedly connected by the upper crossbeam 220 and the lower crossbeam 240 of the cable compartment, respectively; a cable compartment skirt plate 250 is fixedly connected to both the left side plate 210 and the right side plate 230 of the cable compartment; and a cable compartment top skirt plate 260 is fixedly connected to the upper crossbeam 220 of the cable compartment. Multiple rectangular mounting holes 270 are provided on both the left side plate 210 and the right side plate 230 of the cable compartment; Multiple T-shaped holes 280 are provided on the upper crossbeam 220 and the lower crossbeam 240 of the cable compartment; like Figure 3 As shown, the lower cabinet door assembly 8 mainly consists of a lower cabinet door handle 801, a lower cabinet door interlocking plate 802, a lower cabinet door 803, a flame-retardant plate 804, a lower cabinet door right side hook plate 805, fasteners 806, fastening bolts 807, a lower lower cabinet door insert plate 808, a lower lower cabinet door left side hook plate 809, and a lower lower cabinet door upper insert plate 810, which are fixed together by welding or fixed connection.

[0033] The lower cabinet door handle 801 is installed on the upper part of the lower cabinet door 803. The upper and lower ends of the lower cabinet door body 803 are respectively installed with the upper lower cabinet door insert plate 810 and the lower lower cabinet door insert plate 808. A lower cabinet door interlock plate 802 is installed at the lower end of the upper insert plate 810 of the lower cabinet door; The panel of the lower cabinet door 803 is made of flame-retardant board 804; Fastening bolts 807 that penetrate the flame-retardant plate 804 are provided on the upper part of the upper insert plate 810 of the lower cabinet door and the upper part of the lower insert plate 808 of the lower cabinet door. Both the upper panel 810 and the lower panel 808 of the lower cabinet door are equipped with outwardly protruding T-shaped plugs 811; Hook plate 805 on the right side of the lower cabinet door and hook plate 809 on the left side of the lower cabinet door are respectively installed on the right and left sides inside the lower cabinet door 803; Multiple hooks 812 are provided on the hook plate 805 on the right side of the lower cabinet door and the hook plate 809 on the left side of the lower cabinet door; Fasteners 806 that penetrate the flame retardant plate 804 are installed on the flame retardant plate 804.

[0034] T-type plug 811 is inserted into T-type hole 280; Hook 812 is engaged with mounting hole 270.

[0035] The left side panel 210 and right side panel 230 of the cable compartment have several rectangular mounting holes 270 on their front sides for fixing the lower cabinet door assembly 8. When the lower cabinet door assembly 8 is closed, multiple hooks 812 on the right side hook plate 805 and left side hook plate 809 of the lower cabinet door assembly 8 extend into the rectangular mounting holes 270 on the front sides of the left side panel 210 and right side panel 230 of the cable compartment.

[0036] After the lower cabinet door assembly 8 is closed, the outwardly protruding T-shaped plugs 811 installed on the lower cabinet door lower insert plate 808 and the upper cabinet door insert plate 810 of the lower cabinet door assembly 8 extend into the T-shaped holes 280 on the upper crossbeam 220 and the lower crossbeam 240 of the cable compartment 2, pressing down 16mm, and then using fastening bolts 807 to fix the lower cabinet door assembly to the lower crossbeam 240 of the cable compartment 2.

[0037] Closing operation: When closing the door, the lower cabinet door assembly 8 is horizontally attached to the cable compartment 2, the upper edge of the T-type plug 811 is attached to the lower edge of the T-type hole 280, pushed in, and then pressed down 16mm. Multiple hooks 812 are hooked on the lower edge of the mounting hole 270, and then fastened with fastening bolts 807.

[0038] Door opening operation: When opening the door, loosen the fastening bolt 807, then lift the lower cabinet door assembly 8 up about 16mm, the multiple hooks 812 will disengage from the lower edge of the mounting hole 270, and then pull it out.

[0039] Among them, the number of T-type plugs 811 and T-type holes 280 are the same and they are matched together; The number of hooks 812 is the same as the number of mounting holes 270 and they are matched together.

[0040] The lower cabinet door assembly 8 has two bolt mounting holes 270 on its upper and lower parts, respectively, for connecting the lower cabinet door assembly 8 to the cable compartment 2 by fastening bolts 807.

[0041] The left hook plate 809 of the lower cabinet door, the right hook plate 805 of the lower cabinet door, the upper insert plate 810 of the lower cabinet door, and the lower insert plate 808 of the lower cabinet door together form a continuous mechanical interlocking frame that surrounds the door body. This frame is used to disperse and transmit the arcing impact force to the cable chamber cabinet frame when an internal fault occurs in the cable chamber 2.

[0042] The core of this utility model lies in the design of a hybrid locking and load-bearing structure that is "hook-driven and bolt-assisted".

[0043] (1) Left and right side hook mechanism: Several downward-opening hooks 812 are set on the left and right sides of the lower cabinet door 803. When the door is closed, these hooks 812 are directly hooked on the mounting holes 270 of the left and right side plates of the cable compartment, realizing the initial positioning and constraint of the door in the horizontal direction, and bearing most of the lateral tension when the arc occurs.

[0044] (2) Upper and lower hook plate mechanism: Several T-shaped plugs 811 (also called "plug plates" or "tongues") are set on the upper and lower edges of the lower cabinet door 803. When the door is closed, these T-shaped plugs 811 are inserted into the corresponding T-shaped holes 280 (also called bayonets) inside the upper and lower crossbeams of the cable compartment 2. This design realizes the vertical positioning and constraint of the door and bears part of the impact and shear force when the arc occurs.

[0045] (3) Minimalist bolt fastening: After the hooks are attached, only four 807 fastening bolts are needed on the upper part of the door for final fastening. The main function of these bolts is no longer to bear the main mechanical load, but to provide additional clamping force to ensure a seal and to act as a secondary safety measure against accidental opening.

[0046] (4) Force transmission path reconstruction: When subjected to arc pressure, the impact force is transmitted through the door to the hooks 812 and T-type plugs 811 around the perimeter, forming a continuous and closed mechanical interlocking frame. The force is evenly distributed to the entire front frame structure of the cable chamber 2 (the left and right side plates of the cable chamber and the upper and lower crossbeams of the cable chamber), avoiding stress concentration on a few bolt points, thereby greatly enhancing the impact resistance.

[0047] As can be seen from the above embodiments, the present invention has the following advantages: Quick assembly and disassembly, efficient operation and maintenance: During on-site operation, only 4 bolts need to be tightened / loosened to complete the fixing and disassembly of the lower cabinet door, improving operation and maintenance efficiency by more than 80%.

[0048] Extremely high reliability of arc protection: The hooks and hook plates distributed around the perimeter form a mechanically interlocked "safety cage", whose tensile and shear resistance is far superior to discrete bolt connections, effectively resisting the impact of internal fault arcs and preventing the cabinet door from being blown open.

[0049] Excellent rust and anti-slip properties: The core fixing mechanism is a non-threaded mechanical hook, which fundamentally eliminates disassembly difficulties caused by rusted or stripped bolts. Even if the only four bolts are damaged, they are easy to handle.

[0050] Strong adaptability to cabinet deformation: The hook structure itself has a certain amount of room for movement. Compared with rigid bolt connections and embedded structures, it is less sensitive to slight deformation of the cabinet caused by transportation or installation, and has a higher fault tolerance rate.

[0051] This utility model has a simple structure and cost advantage: it reduces the number of bolts used and the amount of machining of threaded holes on the cabinet, simplifies the structure, and reduces manufacturing and spare parts costs.

[0052] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any modifications, equivalent substitutions and improvements made by any person skilled in the art within the scope of the technology disclosed in the present utility model, within the spirit and principles of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A quick-installation fire-resistant arc ring main unit with a lower cabinet door equipped with a hook lock, comprising a ring main unit cabinet body (1), wherein the ring main unit cabinet body (1) is assembled together by a cable compartment (2), a switch compartment (3), a mechanism compartment (4), a control box compartment (5), a control box panel (6), a mechanism compartment panel (7), and a lower cabinet door assembly (8) through a fixed connection; characterized in that, Multiple rectangular mounting holes (270) are provided on the left side plate (210) and right side plate (230) of the cable compartment (2). Multiple T-shaped holes (280) are provided on the upper crossbeam (220) and lower crossbeam (240) of the cable compartment (2). The lower cabinet door assembly (8) has multiple outwardly protruding T-shaped plugs (811) installed on the upper insert plate (810) and lower insert plate (808) of the lower cabinet door assembly (8); the T-shaped plugs (811) are inserted into the T-shaped holes (280); Multiple hooks (812) are provided on the right hook plate (805) and the left hook plate (809) of the lower cabinet door assembly (8); the hooks (812) are engaged with the mounting holes (270).

2. The quick-installation fire-resistant arc ring main unit with a lower cabinet door equipped with a hook locking mechanism as described in claim 1, characterized in that, The cable compartment (2) also includes a left side panel (210) and a right side panel (230). The upper and lower ends of the left side plate (210) and the right side plate (230) of the cable compartment are fixedly connected by the upper crossbeam (220) and the lower crossbeam (240) of the cable compartment, respectively; the left side plate (210) and the right side plate (230) of the cable compartment are both fixedly connected with the cable compartment skirt plate (250); the upper crossbeam (220) of the cable compartment is fixedly connected with the top skirt plate (260) of the cable compartment.

3. The quick-installation fire-resistant arc ring main unit with a lower cabinet door equipped with a hook locking mechanism as described in claim 1, characterized in that, The lower cabinet door assembly (8) also includes a lower cabinet door handle (801), a lower cabinet door interlock plate (802), and a lower cabinet door (803). The lower cabinet door handle (801) is installed on the upper part of the lower cabinet door (803), and the upper and lower ends of the lower cabinet door (803) are respectively installed with the upper lower cabinet door insert plate (810) and the lower lower cabinet door insert plate (808). The lower end of the upper insert plate (810) of the lower cabinet door is equipped with a lower cabinet door interlock plate (802).

4. The quick-installation fire-resistant arc ring main unit with a lower cabinet door equipped with a hook locking mechanism as described in claim 3, characterized in that, The panel of the lower cabinet door (803) is made of flame-retardant board (804); Fastening bolts (807) that penetrate the flame-retardant plate (804) are provided on the upper part of the upper plate (810) of the lower cabinet door and the upper part of the lower plate (808) of the lower cabinet door.

5. The quick-installation fire-resistant arc ring main unit with a lower cabinet door equipped with a hook locking mechanism as described in claim 3, characterized in that, The hook plate (805) on the right side of the lower cabinet door and the hook plate (809) on the left side of the lower cabinet door are respectively installed on the right and left sides inside the lower cabinet door (803).

6. The quick-installation fire-resistant arc ring main unit with a lower cabinet door equipped with a hook locking mechanism as described in claim 4, characterized in that, Fasteners (806) that penetrate the flame retardant plate (804) are installed on the flame retardant plate (804).

7. The quick-installation fire-resistant arc ring main unit with a lower cabinet door equipped with a hook locking mechanism as described in claim 1, characterized in that, The mounting hole (270) is rectangular.

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