High-voltage ring main unit body

Abstract

The utility model discloses a cabinet body of a high-voltage ring main unit, which comprises a top plate, a bottom plate, a cabinet door and a side plate, the bottom plate is provided with a pressure relief structure, and a pressure relief hole is communicated with a cavity in the cabinet; one side of the pressure relief plate is hinged to the bottom plate through a connecting structure, and the other side is fixed through a nylon bolt to seal the pressure relief hole; a buffering assembly is arranged between the pressure relief plate and the bottom plate, and a reset spring is arranged between the bottom plate and the abutting plate in a sleeved mode. When a fault occurs, the nylon bolt is broken, the pressure relief plate overturns around the connecting structure, and the buffering assembly slows down the overturning speed through the lever and damping force; after pressure relief, the reset spring drives the pressure relief plate to temporarily close the hole. Secondary faults can be eradicated, sealing is strengthened, and foreign matter invasion is prevented.

Description

Technical Field

[0001] This utility model relates to the field of ring main unit technology, and in particular to a high-voltage ring main unit cabinet. Background Technology

[0002] In medium-voltage power distribution network systems, high-voltage ring main units serve as core equipment for power distribution and fault isolation. Their bottom pressure relief structure is a crucial component for ensuring the safe operation of the equipment. In existing technologies, the bottom pressure relief structure is generally fixed by a combination of metal bolts and nylon bolts. Under normal operating conditions, the supporting force of the metal bolts and the preload of the nylon bolts work together to ensure that the pressure relief plate fits tightly against the bottom sealing surface of the cabinet, maintaining the pressure stability and sealing of the insulating medium inside the cabinet and preventing the intrusion of external moisture and dust. However, when an arc fault occurs inside the cabinet, the high-temperature and high-pressure gas generated by the fault causes a sudden increase in the gas pressure inside the cabinet. The nylon bolts cannot withstand the pressure and break first. The pressure relief plate flips around the metal bolts and opens, allowing the high-pressure gas to be discharged directionally to a safe area through the bottom pressure relief hole, preventing the cabinet from exploding due to excessive pressure.

[0003] However, in actual use, the internal pressure increases instantaneously during an arc fault. This pressure can cause the nylon bolts to break instantly, impacting the pressure relief plate. This can easily cause the pressure relief plate to collide with the cabinet side panel, busbar compartment partition, or adjacent equipment, resulting in component damage or even secondary faults. Utility Model Content

[0004] The main purpose of this utility model is to provide a high-voltage ring main unit cabinet. In view of the shortcomings of the existing high-voltage ring main unit bottom pressure relief structure, the present invention optimizes the structural design to solve the problem of secondary failure caused by the pressure relief plate colliding with cabinet components at high speed due to the instantaneous breakage of nylon bolts.

[0005] To achieve the above objectives, this utility model proposes a high-voltage ring main unit cabinet, including a cabinet body, the cabinet body including a top plate, a bottom plate, a cabinet door, and at least three side plates disposed between the top plate and the bottom plate, the bottom plate being provided with a pressure relief structure, the pressure relief structure including:

[0006] A pressure relief hole is located on the base plate and connects to a cavity inside the cabinet body;

[0007] The pressure relief plate has one side hinged to the base plate via a connecting structure, and the other side fixed to the base plate with nylon bolts to seal the pressure relief hole; when the pressure inside the cabinet exceeds a set value, the nylon bolts break to release the locking of one end of the pressure relief plate;

[0008] The buffer assembly, located between the pressure relief plate and the base plate, is used to buffer the force on the pressure relief plate when it rotates around the connecting structure due to pressure impact from inside the cabinet.

[0009] In one possible implementation, the connection structure includes:

[0010] A fixed shaft is provided on the side of the pressure relief plate away from the nylon bolt, and threaded holes are provided on both end faces of the fixed shaft;

[0011] There are two hinge shafts, corresponding to the two ends of the fixed shaft respectively. The hinge shafts are rotatably connected to the pressure relief plate and their ends are threadedly connected to the threaded holes to achieve a fixed connection with the fixed shaft.

[0012] In one possible implementation, a pair of limiting strips are provided on the base plate, and the pressure relief plate is disposed between the pair of limiting strips with its two side edges abutting against the limiting strips.

[0013] In one possible implementation, the limiting strip is provided with a through hole concentric with the fixed shaft, one end of the hinge shaft passes through the through hole and is threadedly connected to the threaded hole, and a bearing is provided between the through hole and the hinge shaft, the bearing being used to allow the hinge shaft to rotate relative to the through hole.

[0014] In one possible implementation, the end of the hinge shaft is rotatably provided with a pressing block that slides with the threaded hole; the bottom of the threaded hole is provided with a force-receiving groove that fits with the pressing block, and both the force-receiving groove and the pressing block are provided with conical force-receiving surfaces. When the pressing block moves relative to the force-receiving groove and the two force-receiving surfaces are pressed together, the pressing block will exert a force on the pressure relief plate in the direction of the bottom plate.

[0015] In one possible implementation, the buffer component includes:

[0016] A buffer bar is located on the side of the fixed axis away from the pressure relief plate. The buffer bar and the pressure relief plate form a lever structure with the fixed axis as the fulcrum. There is a buffer space between the buffer bar and the base plate to allow the buffer bar to move.

[0017] An abutment plate is disposed between the base plate and the buffer strip, with one side abutting against the buffer strip; the abutment plate can move within the buffer space as the buffer strip swings.

[0018] The damping element is located between the abutment plate and the base plate and is used to buffer the force exerted on the abutment plate by the buffer strip.

[0019] In one possible implementation, the damping element is a damping rod disposed on the base plate, which includes a damping device and a connecting rod, one end of which is connected to the damping device and the other end of which is connected to the abutment plate.

[0020] In one possible implementation, a return spring is also provided between the base plate and the abutment plate. The return spring is sleeved on the connecting rod and is used to drive the pressure relief plate to rotate toward the pressure relief port by applying force to the buffer strip after the cabinet pressure is released.

[0021] In summary, the beneficial effects of this application are as follows:

[0022] Compared with the prior art, this application uses a connection structure consisting of a fixed shaft, a hinge shaft, and a limiting strip to limit the pressure relief plate to rotate only around the fixed shaft. With the cooperation of the buffer strip, the abutment plate, and the damping rod in the buffer assembly, the impact force is transmitted through the lever when the pressure relief plate rotates. The damping rod slows down the movement of the abutment plate with damping force, thereby reducing the rotation speed of the pressure relief plate. This effectively solves the problem of the pressure relief plate colliding with the cabinet components at high speed due to the instantaneous breakage of the existing nylon bolts, and eliminates secondary failures.

[0023] By pre-tightening the end of the hinge shaft by pressing the end of the compression block against the tapered force groove of the fixed shaft, a basic seal is formed with the nylon bolts. In addition, the return spring, under normal conditions, applies continuous pressure to the pressure relief plate through the abutment plate and buffer strip, which can compensate for the sealing gap caused by the loose nylon bolts, further enhancing the sealing effect and preventing leakage of insulating medium and intrusion of external moisture. At the same time, after pressure relief, the return spring can push the abutment plate and buffer strip to temporarily close the pressure relief port of the pressure relief plate, preventing external dust and small animals from entering the cabinet and damaging other components before maintenance, thus avoiding further expansion of losses. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a diagram of the internal structure of the present invention;

[0027] Figure 3 This is a bottom structural diagram of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the base plate of this utility model;

[0029] Figure 5 This is an exploded view of the base plate of this utility model;

[0030] Figure 6 for Figure 5Enlarged view at point A;

[0031] Figure 7 This is a top structural diagram of the base plate of this utility model;

[0032] Figure 8 This is a connection diagram of the pressure relief plate and buffer assembly of this utility model;

[0033] Figure 9 for Figure 8 Enlarged view at point B;

[0034] Figure 10 This is a partial cross-sectional view of the connection structure of this utility model;

[0035] Explanation of icon numbers:

[0036] 1. Cabinet body; 100. Top plate; 110. Bottom plate; 120. Cabinet door; 130. Side plate; 2. Pressure relief hole; 3. Pressure relief plate; 4. Connecting structure; 40. Fixed shaft; 41. Hinge shaft; 42. Threaded hole; 5. Buffer assembly; 50. Buffer strip; 51. Abutment plate; 52. Damping component; 54. Damping device; 55. Connecting rod; 56. Return spring; 6. Limiting strip; 7. Through hole; 8. Bearing; 9. Extrusion block; 10. Force groove; 11. Force-bearing surface; 12. Nylon bolt.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0039] Example 1

[0040] Reference Figures 1 to 10 This utility model proposes a high-voltage ring main unit cabinet, such as... Figure 1-2 As shown, the cabinet body 1 is composed of a top plate 100, a bottom plate 110, a cabinet door 120 and multiple side plates 130. The cabinet body 1 is assembled by a splicing method and then fixed to each other by bolts or welding. Its structure is existing technology, so it will not be described in detail.

[0041] like Figure 3-5In this embodiment, the pressure relief hole 2 is located on the base plate 110 and extends into the internal cavity of the cabinet, serving as a channel for the discharge of high-pressure airflow in case of a fault. The pressure relief plate 3 is a metal plate adapted to the size of the pressure relief hole 2, covering the pressure relief hole 2. One side of the plate is connected to the base plate 110 via a connecting structure 4 to form a stable rotatable hinge, while the other side is fastened to the base plate 110 via nylon bolts 12, forming a basic sealing structure. By adjusting the orientation of the connecting structure 4 of the pressure relief plate 3, the opening and closing direction of the pressure relief plate 3 can be changed. This allows for changes in the pressure relief direction based on the actual installation location and surrounding environment, preventing damage or impact on the user or surrounding equipment during pressure relief.

[0042] like Figure 5-10 As shown, specifically, the connecting structure 4 includes a fixed shaft 40, a hinge shaft 41, a limiting strip 6, and a bearing 8. The fixed shaft 40 is welded and fixed along the side of the pressure relief plate 3 away from the nylon bolt 12, and has internal threaded holes 42 on both end faces. There are two hinge shafts 41, corresponding to the two ends of the fixed shaft 40 respectively. One end of the hinge shaft 41 passes through the through hole 7 on the limiting strip 6. The bearing 8 is nested between the through hole 7 and the hinge shaft 41. The outer ring of the bearing 8 is interference-fitted with the through hole 7, and the inner ring is snap-fitted with the hinge shaft 41. This ensures that the hinge shaft 41 rotates smoothly without jamming, and also leaves space for subsequent disassembly and assembly.

[0043] The limiting strip 6 is a long metal strip that is vertically welded to the base plate 110. Two limiting strips 6 are symmetrically distributed on both sides of the pressure relief plate 3. The side of the pressure relief plate 3 is tightly fitted with the inner wall of the limiting strip 6, which not only restricts the horizontal displacement during normal operation, but also provides a reference for positioning during disassembly and assembly.

[0044] At the same time, such as Figure 7-9 As shown, the buffer assembly 5 is installed between the pressure relief plate 3 and the base plate 110, and includes a buffer strip 50, an abutment plate 51 and a damping component 52.

[0045] The buffer strip 50 is a long, cylindrical metal strip that is welded to the side of the fixed shaft 40 away from the pressure relief plate 3. Together with the pressure relief plate 3, it forms a lever structure with the fixed shaft 40 as the fulcrum. Sufficient space for swinging is reserved between the buffer strip 50 and the base plate 110. The abutment plate 51 is a rectangular metal plate that is horizontally positioned above the buffer strip 50. Its bottom surface abuts against the free end of the buffer strip 50, and its top surface is connected to the damping element 52. In this embodiment, the damping element 52 is an existing miniature damping rod, but it can also be an elastic material such as a rubber block with elastic deformation capability.

[0046] In this embodiment, the damping rod is vertically fixed on the base plate 110 and consists of a damping device 54 and a connecting rod 55. The damping device 54 is filled with high-viscosity damping oil. The bottom end of the connecting rod 55 extends into the damping device 54 and fixes the piston. A sealing ring is fitted around the piston, and a small throttling hole is opened on the piston.

[0047] When an arc fault occurs inside the cabinet, the high-pressure gas causes a sudden pressure increase and breaks through the nylon bolt 12. The pressure relief plate 3 flips around the hinge shaft 41, causing the buffer strip 50 to swing synchronously. The buffer strip 50 presses upward against the abutment plate 51, and the abutment plate 51 pushes the connecting rod 55 and the piston downward. The damping oil generates viscous resistance through the piston throttling orifice. This resistance is transmitted in the opposite direction to the pressure relief plate 3 through the abutment plate 51 and the buffer strip 50, which greatly slows down the flipping speed and prevents it from colliding with the cabinet side panel 130 or the busbar compartment partition. At the same time, the limit strip 6 continuously constrains the trajectory of the pressure relief plate 3, and the high-pressure airflow is smoothly discharged through the pressure relief hole 2 to prevent the cabinet from exploding and causing secondary faults.

[0048] After the pressure is released, the reset spring 56, which is sleeved on the damping rod connecting rod 55, will release its elastic potential energy, push the abutment plate 51 to move down, drive the buffer strip 50 to swing in the opposite direction, and then pull the pressure relief plate 3 back to fit against the bottom plate 110, temporarily closing the pressure relief hole 2 to prevent dust and small animals from entering and damaging the components before maintenance.

[0049] In addition, the buffer strip 50 has a cylindrical structure, which allows it to slide relative to the abutment plate 51 during the swinging process along an arc path, thereby ensuring that the buffer strip 50 swings smoothly and avoiding interference between the buffer strip 50 and the abutment plate 51.

[0050] Meanwhile, after the pressure relief is completed and the staff has finished the maintenance, when it is necessary to disassemble and install the pressure relief plate 3 after the pressure relief is completed, the operation process is fully compatible with the existing structural design, ensuring convenience and reliability.

[0051] During disassembly, first confirm that the cabinet is powered off and the internal pressure is zero. Then, use a wrench to unscrew the broken section of the nylon bolt 12 remaining on the base plate 110. The nylon bolt 12 is fixed to the base plate 110 by a nut, so during disassembly, only the nut needs to be removed to take out the bolt. Next, use a screwdriver or wrench to loosen the end of the hinge shaft 41 away from the fixed shaft 40. The end of the hinge shaft 41 may have a hexagonal or slotted groove. As the hinge shaft 41 is unscrewed, it loosens its connection with the fixed shaft 40. As the connection of the perforated hole 42 gradually disengages, after both hinge shafts 41 are loosened to disengage from the through hole 7 of the limiting strip 6, hold the side of the pressure relief plate 3 away from the fixed shaft 40 with both hands, lift it slightly upwards and slide it outwards from the limiting strip 6 to remove the pressure relief plate 3 from between the limiting strips 6. During this process, the spacing of the limiting strips 6 is adapted to the width of the pressure relief plate 3, and no additional parts need to be disassembled during the sliding. Since the buffer assembly 5 is fixed to the fixed shaft 40 and the base plate 110, it will not hinder the disassembly and assembly of the pressure relief plate 3.

[0052] When installing the new pressure relief plate 3, first place the pressure relief plate 3 between the two limiting strips 6, aligning the two ends of the fixed shaft 40 on the pressure relief plate 3 with the through holes 7 of the limiting strips 6. Then, pass the hinge shaft 41 through the through holes 7 of the limiting strips 6 and slowly screw it in, aligning it with the threaded hole 42 of the fixed shaft 40. Next, check the alignment of the pressure relief plate 3 with the pressure relief hole 2. After adjusting it to completely cover the pressure relief hole 2, screw in the new nylon bolt 12 at the mounting hole on the other side of the pressure relief plate 3. Tighten it until the preload of the nylon bolt 12 and the tapered preload of the hinge shaft 41 work together to ensure that there is no gap between the pressure relief plate 3 and the sealing surface of the base plate 110. Finally, manually push both sides of the pressure relief plate 3 to check whether its rotation around the hinge shaft 41 is smooth. At the same time, observe whether the return spring 56 can normally push the abutment plate 51 to ensure that the buffer assembly 5 and the return spring 56 are functioning normally. After the installation is completed, the cabinet can be restored to a sealed state and wait for operation. The entire disassembly and assembly process does not require disassembling the fixed shaft 40, limit strip 6, or buffer assembly 5 of the connecting structure 4. It only involves the operation of the nylon bolt 12 and the hinge shaft 41, which is compatible with the existing structural design and greatly shortens the maintenance time, ensuring operation and maintenance efficiency.

[0053] Example 2

[0054] Based on Example 1, such as Figure 10 As shown, a pressing block 9 is rotatably connected to one end of the hinge shaft 41 near the fixed shaft 40 via a needle roller bearing 8. The outer wall of the pressing block 9 slides in fit with the inner wall of the threaded hole 42 of the fixed shaft 40. A tapered force groove 10 is machined at the bottom of the threaded hole 42 of the fixed shaft 40. The end face of the pressing block 9 facing the force groove 10 is also tapered. A force-bearing surface 11 with the same taper is provided between the two. During normal operation, tightening the hinge shaft 41 causes the pressing block 9 to move along the threaded hole 42 toward the force-bearing groove 10. After the force-bearing surface 11 is fully engaged, an axial preload is generated. Combined with the tightening force of the nylon bolt 12, this ensures that the pressure relief plate 3 and the sealing surface of the base plate 110 are tightly engaged, preventing leakage of the insulating medium inside the cabinet. At the same time, a guide groove is provided on the inner wall of the threaded hole 42, and a guide block that mates with the guide groove is provided on the pressing block 9. During the screwing process, the pressing block 9 at the end of the hinge shaft 41 will gradually approach the conical force-bearing groove 10 of the fixed shaft 40 with the cooperation of the guide block and the guide groove until the conical surface is fully engaged. Continuing to tighten the hinge shaft 41 can apply a preload to ensure that the pressure relief plate 3 is engaged with the base plate 110, thereby improving the connection and sealing between the pressure relief plate 3 and the base plate 110.

[0055] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0056] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A high-voltage ring main unit cabinet, comprising a cabinet body (1), wherein the cabinet body (1) includes a top plate (100), a bottom plate (110), a cabinet door (120), and at least three side plates (130) disposed between the top plate (100) and the bottom plate (110), wherein the bottom plate (110) is provided with a pressure relief structure, characterized in that, The pressure relief structure includes: Pressure relief hole (2), which is provided on the base plate (110) and connects to the cavity inside the cabinet body (1); The pressure relief plate (3) is hinged to the base plate (110) on one side by a connecting structure (4), and fixed to the base plate (110) on the other side by a nylon bolt (12) to close the pressure relief hole (2); when the pressure inside the cabinet is greater than the set value, the nylon bolt (12) breaks to release the locking of one end of the pressure relief plate (3); The buffer assembly (5) is located between the pressure relief plate (3) and the base plate (110) to buffer the force on the pressure relief plate (3) when it rotates around the connecting structure (4) due to pressure impact inside the cabinet.

2. The high-voltage ring main unit cabinet according to claim 1, characterized in that, The connection structure (4) includes: A fixed shaft (40) is provided on the side edge of the pressure relief plate (3) away from the nylon bolt (12), and threaded holes (42) are provided on both end faces of the fixed shaft (40). There are two hinge shafts (41), which correspond to the two ends of the fixed shaft (40) respectively. The hinge shaft (41) is rotatably connected to the pressure relief plate (3) and its end is threadedly connected to the threaded hole (42) to achieve a fixed connection with the fixed shaft (40).

3. The high-voltage ring main unit cabinet according to claim 2, characterized in that, A pair of limiting strips (6) are provided on the base plate (110), and the pressure relief plate (3) is disposed between the pair of limiting strips (6) with its two side edges abutting against the limiting strips (6).

4. The high-voltage ring main unit cabinet according to claim 3, characterized in that, The limiting strip (6) is provided with a through hole (7) concentric with the fixed shaft (40). One end of the hinge shaft (41) passes through the through hole (7) and is threaded to the threaded hole (42). A bearing (8) is provided between the through hole (7) and the hinge shaft (41). The bearing (8) is used to allow the hinge shaft (41) to rotate relative to the through hole (7).

5. A high-voltage ring main unit cabinet according to any one of claims 2-4, characterized in that, The end of the hinge shaft (41) is rotatably provided with a pressing block (9) that slides with the threaded hole (42); the bottom of the threaded hole (42) is provided with a force groove (10) that fits into the pressing block (9); both the force groove (10) and the pressing block (9) are provided with a conical force surface (11); when the pressing block (9) moves relative to the force groove (10) and the two force surfaces (11) are pressed together, the pressing block (9) will exert a force on the pressure relief plate (3) in the direction of the bottom plate (110).

6. A high-voltage ring main unit cabinet according to any one of claims 1-4, characterized in that, The buffer component (5) includes: A buffer strip (50) is provided on the side of the fixed shaft (40) away from the pressure relief plate (3). The buffer strip (50) and the pressure relief plate (3) form a lever structure with the fixed shaft (40) as the fulcrum. There is a buffer space between the buffer strip (50) and the base plate (110) for the buffer strip (50) to move. An abutment plate (51) is disposed between the base plate (110) and the buffer strip (50) and one side of the abutment plate (51) abuts against the buffer strip (50); the abutment plate (51) can move within the buffer space as the buffer strip (50) swings. The damping element (52) is disposed between the abutment plate (51) and the base plate (110) to buffer the force on the abutment plate (51) when the abutment plate (51) is subjected to the force of the buffer strip (50).

7. A high-voltage ring main unit cabinet according to claim 6, characterized in that, The damping element (52) is a damping rod disposed on the base plate (110), which includes a damping device (54) and a connecting rod (55). One end of the connecting rod (55) is connected to the damping device (54), and the other end is connected to the abutment plate (51).

8. A high-voltage ring main unit cabinet according to claim 7, characterized in that, A reset spring (56) is also provided between the base plate (110) and the abutment plate (51). The reset spring (56) is sleeved on the connecting rod (55) and is used to drive the pressure relief plate (3) to rotate toward the pressure relief port by applying force to the buffer strip (50) after the cabinet pressure is released.

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