Modular low-voltage cabinet and closing method of suspended modular low-voltage cabinet
Through the liftable electrical component bracket and transverse slide structure of the modular low-voltage cabinet, the problems of difficulty in repairing suspended low-voltage cabinets and the risk of closing explosion are solved, and safer closing operation and personnel protection are achieved.
Patent Information
- Application Number
- CN202510426332.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2025-07-04
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing low-voltage cabinet suspension installation method is difficult to repair, there is a risk of explosion when closing, and the explosion shock wave is seriously harmful to personnel.
A modular low-voltage cabinet is designed, adopting liftable electrical component brackets and transverse slide rail structures. The electrical component brackets are descended simultaneously with the cabinet doors. The closing operation is achieved through the detachable closing rods, and the explosion energy is released and the pressure is protected by the personnel through the cabinet doors and slide rails.
It reduces the difficulty of repairing suspended low-voltage cabinets, improves the safety of closing, reduces the damage caused by explosions to personnel, and provides higher safety protection.
Smart Images
Figure CN120262203A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of circuit devices, and in particular relates to a modular low-voltage cabinet and a closing method of a suspended modular low-voltage cabinet. Background Art
[0002] Low voltage cabinet, also known as low voltage distribution cabinet or low voltage switch cabinet, is an electrical device used to centrally control and distribute low voltage electric energy, and plays a vital role in the power system. The structure of low voltage cabinet mainly includes cabinet body and circuit control part, and the circuit control part includes circuit breaker, isolating switch, contactor, etc. The circuit control part can realize the on and off of the circuit by closing and opening the switch.
[0003] Low-voltage cabinets are usually installed in machine rooms, workshops or factories, floor distribution boxes or special distribution rooms, distribution rooms, etc. The conventional installation method is to fix them to the ground with fastening bolts, but due to the limitations of space and usage conditions, there are also special installation methods. For example, overhead installation uses a steel frame structure to support the low-voltage cabinet to meet the height requirements from the ground.
[0004] The above-mentioned overhead installation method has many advantages such as "not occupying ground space", "not being affected by ground moisture", "low probability of being collided", etc., but also has the following disadvantages: 1. Compared with the conventional ground installation method, maintenance personnel cannot stand on the ground to repair the suspended low-voltage cabinet, and need to use ladders, high stools, etc., which increases the difficulty of maintenance. Especially for daily inspection and maintenance, the frequency of climbing ladders is high, which is inconvenient.
[0005] 2. Before closing the low-voltage cabinet, the protective device inspection, secondary circuit inspection, fault troubleshooting and other preliminary preparations will be carried out, but it is still impossible to ensure that there will be no risks such as closing short circuit and closing explosion. In particular, in the event of an electrical explosion, the blast wave will instantly rush to the closing personnel standing directly in front of or diagonally in front of the low-voltage cabinet, causing casualties of varying degrees. Because the cabinet of the low-voltage cabinet cannot be depressurized, the shock wave generated by the explosion is instead directed in the direction of the cabinet door, and the closing personnel are very likely to fall from the ladder, causing greater harm to the personnel. Summary of the invention
[0006] In view of the deficiencies of the prior art, the present invention provides a modular low-voltage cabinet, which includes a cabinet body, a cabinet door, and an electrical component support; openings adapted to the cabinet door and the electrical component support are respectively provided on the front side wall and the bottom wall of the cabinet body, and a plurality of longitudinal grooved limit rails are respectively provided on the inner surfaces of the left side wall and the right side wall of the cabinet body; the electrical component support includes a longitudinal straight rod, a transverse mounting rail, and a reset assembly; a straight rod is provided in the chute of each grooved limit rail, and the straight rods on the left side and the right side are opposite to each other one by one; at least one mounting rail is provided between each pair of opposite straight rods, and the reset assembly is installed between the upper ends of all the straight rods and the top wall of the cabinet body; the cabinet door is connected to the electrical component support through a connecting member and the cabinet door is located at the opening on the front side wall of the cabinet body. By pulling down the electrical component support with an external force, the electrical component support extends out from the opening on the bottom wall of the cabinet body, and the cabinet door moves down synchronously and the reset assembly stores energy.
[0007] Preferably, the number of the grooved limit rails on the left side wall and the right side wall of the cabinet body is the same and at least two are provided, and all the grooved limit rails are equidistantly distributed along the front-rear direction. The grooved limit rails are distributed in pairs left and right, and each pair of grooved limit rails forms a layer for installing electrical components, with at least two layers provided, and the number of pairs of grooved limit rails can also be increased according to the installation requirements.
[0008] Preferably, the transverse width of each straight rod is greater than the depth of the chute of the grooved limit rail, and a column of longitudinally distributed mounting through holes is provided on the part of each straight rod that extends beyond the corresponding chute. All the mounting through holes of each pair of opposite straight rods are opposite to each other, and the two ends of each mounting rail are detachably connected to the corresponding two straight rods through the opposite two mounting through holes. Since the straight rod and the mounting rail will move up and down synchronously, the connection part of the mounting rail and the straight rod needs to extend beyond the chute, and the connection part does not affect the up and down movement of the electrical component support. The mounting rail and the straight rod are detachably connected by bolts, and the mounting height of adjacent two mounting rails is adjusted according to the longitudinal spacing installation requirements of the electrical components, which is flexibly adjustable.
[0009] Preferably, a straight rod adjacent to the left side of the cabinet door is slidably connected to the cabinet door through a transverse slide rail, the slider of the transverse slide rail is fixedly connected to the right side surface of the straight rod, and the transverse slide rail is fixedly connected to the inner surface of the cabinet door. The cabinet door adopts a transverse sliding open structure, instead of the existing hinge opening structure. The purpose is that the transverse slide rail restricts the front-rear movement of the cabinet door. If an electrical explosion accident occurs, the cabinet door is restricted by the transverse slide rail, which can prevent the shock wave from propagating forward. The shock wave is borne by the cabinet door and the transverse slide rail, thereby protecting the closing personnel. The existing hinge-opening cabinet door does not have this protection function.
[0010] Preferably, the cabinet door is provided with a closing rod that can swing longitudinally. The inner end of the closing rod extends towards the interior of the cabinet body and is connected to the closing handle on the electrical component support. The outer end of the closing rod extends towards the exterior of the cabinet body. By pressing down the outer end of the closing rod, the inner end of the closing rod can pry the closing handle upwards to close the switch. Compared with the existing method of closing the switch by opening the door, the method of closing the switch with the door closed has a higher safety factor and better protection effect on the switch-closing personnel. The cabinet door is provided with a hinged through-hole, and a transverse hinge shaft is arranged in the hinged through-hole. The middle part of the closing rod is detachably connected to the transverse hinge shaft. The closing rod is divided into an outer end part and an inner end part, and the two parts are two sections. Each section has an external thread at its end. The transverse hinge shaft is provided with two threaded holes, and the two sections of the closing rod are detachably connected to the transverse hinge shaft through threads. After the switch is closed, the two sections of the closing rod are detached from the front and rear of the cabinet door respectively, without affecting the normal use of the cabinet door. In addition, a protective cover for shielding the hinged through-hole is arranged on the exterior of the cabinet door, and the closing rod penetrates through the protective cover. The protective cover seals the hinged through-hole to prevent the shock wave from overflowing at the hinged through-hole, improving the safety level.
[0011] Preferably, the reset assembly includes a bottom plate and a spring; the lower surface of the bottom plate is fixedly connected to the upper ends of all the straight rods, and the two ends of the spring are respectively connected to the upper surface of the bottom plate and the inner surface of the top wall of the cabinet body. After the electrical component support descends, the spring's elastic force pulls the electrical component support to rise and reset. Specifically, there are four springs, and the four springs are distributed in a rectangular shape between the bottom plate and the top wall of the cabinet body. A damping telescopic rod is arranged inside each spring, and the two ends of each damping telescopic rod are respectively fixedly connected to the bottom plate and the top wall of the cabinet body. After each electrical component descends synchronously with the electrical component support and the cabinet door, a pulling rope, a heavy object, etc. can be arranged below the electrical component support to keep the electrical component support in the lowered position. After the repair and maintenance are completed, the pulling rope and the heavy object are separated to release the electrical component support. The electrical component support resets under the action of the spring's elastic force and is hindered by the resistance of the damping telescopic rod during the rising process, preventing the spring from oscillating up and down, so that the electrical component support and the cabinet door rise and reset slowly and smoothly. In addition, a wire splitter is arranged between the top wall of the cabinet body and the bottom plate. The wire splitter is fixed to the inner surface of the top wall of the cabinet body, and the top wall of the cabinet body is provided with a wire passing through-hole corresponding to the wire splitter. The external access wire passes through the wire passing through-hole into the cabinet body and is electrically connected to the wire splitter. The wire winding disc on the wire splitter stores a sufficient length of wire to meet the requirements of the rise and fall of the electrical component support. Therefore, the rise and fall function of the electrical component support does not conflict with the electrical connection relationship between the low-voltage cabinet and the external access wire.
[0012] The beneficial effects of the modular low-voltage cabinet in the present invention are as follows: 1. After the low-voltage cabinet is installed suspended, all the electrical components on the electrical component bracket can be synchronously lowered to a suitable height by pulling down the electrical component bracket, and then subsequent maintenance, repair, troubleshooting, closing operations, etc. can be completed on the ground without tools such as ladders and step stools. This is no different from the existing maintenance method of ground-mounted low-voltage cabinets, but compared with the existing suspended low-voltage cabinets, the maintenance difficulty is reduced and the operation is simpler.
[0013] 2. Since secondary components such as indicators, meters, and controllers are integrated on the cabinet door, there is an electrical connection between the secondary components and the electrical components on the electrical component bracket. The cabinet door is connected to the electrical component bracket, and the two can be lifted and lowered synchronously. All the electrical components in the cabinet are concentrated on the cabinet door and the electrical component bracket. The electrical components are not directly connected to the cabinet door. All the electrical components, the cabinet door, and the electrical component bracket form a liftable module, meeting both the lifting requirements and the circuit connection requirements.
[0014] 3. Compared with the closing operation of the existing suspended low-voltage cabinets, closing on the ground is safer. Even if a closing failure occurs, the closing personnel are not at risk of falling, and the safety level is higher.
[0015] 4. The electrical component bracket is different from the existing bracket. The electrical component bracket has a liftable function, which not only meets the requirement of convenient maintenance of the suspended low-voltage cabinet, but more importantly, improves the closing safety level. If a closing explosion occurs, in the existing low-voltage cabinet, only the cabinet door direction can relieve pressure (the cabinet door is in the open state during closing), while the other side walls of the cabinet body play a negative role, that is, they converge the explosion energy, and a large amount of heat energy, mechanical energy, etc. released are converged in the cabinet body and released from the front side of the cabinet body, with a greater release power. After the electrical component bracket in the present invention descends, all the electrical components are exposed. If an electrical explosion occurs, the explosion energy is instantaneously released into the surrounding space and relieves pressure in an open area, greatly weakening the explosion power and correspondingly reducing the probability of personnel injury.
[0016] The present invention provides a closing method for a suspended modular low-voltage cabinet. Based on the above modular low-voltage cabinet, the steps are as follows: First, pull down the electrical component bracket and the cabinet door inside the suspended modular low-voltage cabinet to a suitable height to expose the electrical component bracket. During the pulling-down process, the winding disc of the wire splitter rotates in the reverse direction to synchronously release the wires. Keep the height of the electrical component bracket after pulling down. The closing rod passes through the protective cover and is connected to the horizontal hinge shaft, and the inner end of the closing rod is connected to the closing handle of the electrical component bracket.
[0017] Then, press down the outer end of the closing rod, and use the closing rod to pry the closing handle to swing upward for closing.
[0018] Finally, there are two situations for closing the switch. One is that if the closing is successful, the closing rod is disassembled, and the electrical component bracket is released. Under the action of the spring force and the damping telescopic rod, the electrical component bracket slowly rises and resets. The other is that if the closing fails, the shock wave generated by the closing is released from the direction outside the cabinet door, thereby protecting the operator standing directly in front of the cabinet door. Check for faults and close the switch again until the closing is successful, and then release the electrical component bracket. Under the action of the spring force and the damping telescopic rod, the electrical component bracket slowly rises and resets.
[0019] The closing method in the present invention has the following advantages: All electrical components are concentrated on the electrical component bracket and the cabinet door. After all electrical components drop with the electrical component bracket, all electrical components are exposed. If an electrical explosion accident occurs, the electric arc, shock wave, etc. generated by the explosion can be discharged from directions such as the rear, left, and right, while the cabinet door acts as a shield to protect the closing personnel standing directly in front of the cabinet door, greatly improving the safety factor of the closing method and significantly enhancing the protection effect on personnel. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0021] Figure 1 It is a schematic structural diagram of the modular low-voltage cabinet in the present invention; Figure 2 is Figure 1 a schematic diagram after hiding the protective cover in Figure 3 is Figure 2 a schematic diagram after hiding the cabinet door in
[0022] Reference numerals: cabinet body 1, cabinet door 2, electrical component bracket 3, opening 4, grooved limit rail 5, wire splitter 6, wire passing through hole 7, straight rod 8, installation track 9, reset assembly 10, installation through hole 11, protective cover 12, bottom plate 13, spring 14, damping telescopic rod 15, transverse slide rail 16, slider 17, closing rod 18, transverse hinge shaft 19, hinge through hole 20, limit hook 21, limit rod 22. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] In view of the deficiencies in the prior art, the inventors of this case have proposed the technical solution of the present invention through long-term research and a large number of practices. The following will further explain the technical solution, its implementation process and principle, etc. in combination with the drawings in the embodiments of the present application and specific implementation cases.
[0024] Example 1 As Figure 1 shown, Example 1 provides a modular low-voltage cabinet, including a cabinet body 1, a cabinet door 2 and an electrical component bracket 3. An opening 4 adapted to the cabinet door 2 and the electrical component bracket 3 is respectively provided on the front side wall and the bottom wall of the cabinet body 1. A baffle adapted to the opening 4 on the bottom wall can be added, and the baffle can be opened before maintenance. The baffle is not shown in the figure. The cabinet door 2 adopts a lateral sliding opening method, and the electrical component bracket 3 can extend from the bottom wall of the cabinet body 1, which is particularly suitable for the requirements of suspended installation.
[0025] The specific connection structure of the cabinet body 1 is as follows: On the inner surfaces of the left side wall and the right side wall of the cabinet body 1, three longitudinal grooved limiting rails 5 are respectively provided, but not limited to three, it can be two, or four, etc. Specifically, the number of grooved limiting rails 5 on the left side wall and the right side wall of the cabinet body 1 is the same, that is, three in both cases, and all the grooved limiting rails 5 are equally spaced along the front-rear direction. The grooved limiting rails 5 are distributed in pairs left and right, and each pair of grooved limiting rails 5 forms an electrical component installation layer. The number of pairs of grooved limiting rails 5 can also be increased according to the installation requirements. A wire splitter 6 is fixedly installed on the top wall of the cabinet body 1, and a wire passing through hole 7 corresponding to the wire splitter 6 is provided on the top wall of the cabinet body 1. The external access wire passes through the wire passing through hole 7 into the cabinet body 1 and is electrically connected to the wire splitter 6. The wires of the wire splitter 6 are then electrically connected to the electrical components inside the cabinet body 1. The wire winding disc of the wire splitter 6 is equipped with a torsion spring, and a certain length of wire is stored on the wire winding disc. After the wire is pulled out, it can be automatically wound around the wire winding disc and reset under the action of the torsion spring.
[0026] The specific connection structure of the electrical component bracket 3 is as follows: The electrical component support 3 includes a longitudinal straight rod 8, a transverse mounting rail 9, and a reset assembly 10; a straight rod 8 is provided in the chute of each grooved limiting rail 5, and the straight rod 8 on the left and the straight rod 8 on the right are opposite to each other one by one; three mounting rails 9 are provided between every two opposite straight rods 8, and it can also be two, or four, etc. The mounting rail 9 adopts an existing standard rail, that is, a TH35mm rail, and the electrical components are connected to the mounting rail 9, and the mounting method is the same as that of the existing low-voltage cabinet. Since the electrical component support 3 needs to slide up and down, the transverse width of each straight rod 8 is greater than the depth of the chute of the grooved limiting rail 5, and a column of longitudinally distributed mounting through holes 11 is provided on the part of each straight rod 8 exceeding the corresponding chute. All the mounting through holes 11 of every two opposite straight rods 8 are opposite to each other, and both ends of each mounting rail 9 are detachably connected to the corresponding two straight rods 8 through two opposite mounting through holes 11. Since the straight rod 8 and the mounting rail 9 will lift and lower synchronously, the connecting part of the mounting rail 9 and the straight rod 8 needs to exceed the chute, and the connecting part does not affect the lifting and lowering of the electrical component support 3. The mounting rail 9 and the straight rod 8 are detachably connected by bolts, and the mounting height of adjacent two mounting rails 9 is adjusted according to the longitudinal spacing installation requirements of the electrical components, which is flexibly adjusted.
[0027] In addition, in order to limit the maximum descending distance of the electrical component support 3, a limiting hook 21 is provided at the lower part of each grooved limiting rail 5, and a limiting rod 22 corresponding to the limiting hook 21 is provided at the upper part of each straight rod 8. When the limiting rod 22 falls on the limiting hook 21, the electrical component support 3 reaches the maximum descending distance, and the electrical component support 3 can be prevented from completely detaching from the cabinet body 1.
[0028] After the electrical component support 3 descends, it is automatically reset by the reset assembly 10 installed between the upper ends of all the straight rods 8 and the top wall of the cabinet body 1. The specific structure of the reset assembly 10 is as follows: The reset component 10 includes a bottom plate 13 and a spring 14; the lower surface of the bottom plate 13 is fixedly connected to the upper ends of all the straight rods 8, and the two ends of the spring 14 are respectively connected to the upper surface of the bottom plate 13 and the inner surface of the top wall of the cabinet body 1. After the electrical component bracket 3 descends, the elastic force of the spring 14 pulls the electrical component bracket 3 to rise and reset. Specifically, four springs 14 are provided, and the four springs 14 are distributed in a rectangular shape between the bottom plate 13 and the top wall of the cabinet body. A damping telescopic rod 15 is provided inside each spring 14, and the two ends of each damping telescopic rod 15 are fixedly connected to the bottom plate 13 and the top wall of the cabinet body respectively. After each electrical component descends synchronously with the electrical component bracket 3 and the cabinet door 2, a pull rope, a heavy object, etc. can be arranged below the electrical component bracket 3 to keep the electrical component bracket 3 in the lowered position. After the repair and maintenance are completed, the pull rope and the heavy object are separated to release the electrical component bracket 3. The electrical component bracket 3 is reset under the action of the elastic force of the spring 14, and is hindered by the resistance of the damping telescopic rod 15 during the rising process, preventing the spring 14 from oscillating up and down, so that the electrical component bracket 3 and the cabinet door 2 rise and reset slowly and smoothly.
[0029] In this embodiment, the cabinet door 2 adopts a side-sliding opening and closing structure, and the specific structure is as follows: A straight rod 8 adjacent to the left side of the cabinet door 2 is slidably connected to the cabinet door 2 through a transverse slide rail 16. The slider 17 of the transverse slide rail 16 is fixedly connected to the right side surface of the straight rod 8, and the transverse slide rail 16 is fixedly connected to the inner surface of the cabinet door 2. In order to improve the stability of the cabinet door 2, two transverse slide rails 16 are provided, and the two transverse slide rails 16 are distributed at the upper and lower parts inside the cabinet door 2. The cabinet door 2 adopts a transverse sliding opening structure. After the electrical component bracket 3 and the cabinet door 2 descend synchronously, the cabinet door 2 can be manually pushed to slide to the left, and the cabinet door 2 is misaligned with the electrical component bracket 3, that is, the cabinet door 2 is opened. The side-sliding opening structure of the cabinet door 2 replaces the existing hinge opening structure. The purpose is that the transverse slide rail 16 restricts the front and back movement of the cabinet door 2. If an electrical explosion accident occurs, the cabinet door 2 is restricted by the transverse slide rail 16, which can prevent the shock wave from propagating forward. The cabinet door 2 and the transverse slide rail 16 bear the shock wave, thereby protecting the closing personnel. The existing hinge-opening cabinet door 2 does not have this protection function.
[0030] The existing low-voltage cabinet uses open-door closing, while the cabinet door 2 in this embodiment uses closed-door closing, which is realized through the following structure: The cabinet door 2 is provided with a closing rod 18 that can swing longitudinally. The inner end of the closing rod 18 extends towards the inside of the cabinet body 1 and is connected to the closing handle on the electrical component bracket 3. The outer end of the closing rod 18 extends towards the outside of the cabinet body 1. By pressing down the outer end of the closing rod 18, the inner end of the closing rod 18 can pry the closing handle upwards for closing. Here, the closing handle refers to the switch handle on a circuit breaker or disconnector. One end of the closing rod 18 is provided with a blind hole adapted to the closing handle, and the closing handle can be inserted into the blind hole. Compared with the existing method of closing the switch by opening the door, the method of closing the switch with the door closed has a higher safety factor and better protection effect on the switch-closing personnel. The cabinet door 2 is provided with a hinged through hole 20, and a transverse hinge shaft 19 is arranged in the hinged through hole 20. The middle part of the closing rod 18 is detachably connected to the transverse hinge shaft 19. The closing rod 18 is divided into an outer end part and an inner end part, and the two parts are two sections. The end of each section is provided with an external thread. The transverse hinge shaft 19 is provided with two threaded holes, and the two sections of the closing rod 18 are detachably connected to the transverse hinge shaft 19 through threads. After the closing operation is completed, one section of the closing rod 18 can be disassembled from the rear through the electrical component bracket 3, and then the other section of the closing rod 18 can be disassembled from the front of the cabinet door 2. After disassembly, it does not affect the normal use of the cabinet door 2. In addition, a protective cover 12 for shielding the hinged through hole 20 is arranged outside the cabinet door 2, and the closing rod 18 passes through the protective cover 12. The protective cover 12 seals the hinged through hole 20 to prevent the shock wave from overflowing at the hinged through hole 20 and improves the safety level.
[0031] The cabinet body 1 of this embodiment can be installed on a suspended fixed frame to achieve suspended installation. Compared with the closing operation of the existing suspended low-voltage cabinet, it is more convenient to perform routine operations such as maintenance and repair on the ground, and the closing is safer. Even if a closing failure occurs, there is no risk of falling for the switch-closing personnel, and the safety level is higher.
[0032] Embodiment Two; Embodiment Two provides a method for closing a suspended modular low-voltage cabinet. Based on the modular low-voltage cabinet of Embodiment One, the method is as follows: First, pull down the electrical component bracket 3 and the cabinet door 2 inside the suspended modular low-voltage cabinet to an appropriate height to expose the electrical component bracket 3. During the pulling-down process, the winding disc of the wire splitter 6 rotates in the reverse direction to synchronously release the wires. Keep the height of the electrical component bracket 3 after pulling it down. After the closing rod 18 passes through the protective cover 12, it is connected to the transverse hinge shaft 19, and the inner end of the closing rod 18 is connected to the closing handle of the electrical component bracket 3.
[0033] Then, press down the outer end of the closing rod 18, and pry the closing handle upwards to swing and close the switch through the closing rod 18.
[0034] Finally, there are two cases for closing the switch. One is that if the closing is successful, the closing rod 18 is split, and the electrical component bracket 3 is released. The electrical component bracket 3 slowly rises and resets under the action of the elastic force of the spring 14 and the damping telescopic rod 15. The other is that if the closing fails, the shock wave generated by the closing is released from the direction outside the cabinet door 2, thereby protecting the operator standing directly in front of the cabinet door 2. After troubleshooting and reclosing until the closing is successful, the electrical component bracket 3 is released, and the electrical component bracket 3 slowly rises and resets under the action of the elastic force of the spring 14 and the damping telescopic rod 15.
[0035] Compared with the existing closing method, the closing method of this embodiment is simpler in operation, eliminating the complex closing operation process. All electrical components are concentrated on the electrical component bracket 3 and the cabinet door 2. After all electrical components descend with the electrical component bracket 3, all electrical components are exposed. If an electrical explosion accident occurs, the arc, shock wave, etc. generated by the explosion can be discharged from the rear, left, right and other directions, and the cabinet door 2 acts as a shield to protect the closing personnel standing directly in front of the cabinet door 2, greatly improving the safety factor of the closing method and significantly enhancing the protection effect on personnel.
[0036] It should be understood that the above embodiments are only used to illustrate the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can also be made. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims
1. A modular low-voltage switchgear, characterized in that: It includes a cabinet body, a cabinet door and an electrical component bracket; Openings adapted to the cabinet door and the electrical component bracket are respectively provided on the front side wall and the bottom wall of the cabinet body, and a plurality of longitudinal grooved limiting rails are respectively provided on the inner surfaces of the left side wall and the right side wall of the cabinet body; The electrical component bracket includes a longitudinal straight rod, a transverse mounting rail and a reset assembly; a straight rod is provided in the chute of each grooved limiting rail, and the straight rods on the left side and the right side are opposite to each other one by one; at least one mounting rail is provided between each pair of opposite straight rods, and the reset assembly is installed between the upper ends of all the straight rods and the top wall of the cabinet body; The cabinet door is connected to the electrical component bracket through a connecting piece and the cabinet door is located at the opening on the front side wall of the cabinet body. By pulling down the electrical component bracket with an external force, the electrical component bracket extends out from the opening on the bottom wall of the cabinet body, and the cabinet door moves downward synchronously and the reset assembly stores energy.
2. The modular low-voltage switchgear according to claim 1, wherein: The number of the grooved limiting rails on the left side wall and the right side wall of the cabinet body is the same and at least two are provided, and all the grooved limiting rails are equally spaced along the front-back direction.
3. A modular low-voltage switchgear according to claim 1, characterized in that: The transverse width of each straight rod is greater than the depth of the chute of the grooved limiting rail. A column of longitudinally distributed mounting through holes is provided on the part of each straight rod exceeding the corresponding chute. All the mounting through holes of each pair of opposite straight rods are opposite to each other. The two ends of each mounting rail are detachably connected to the corresponding two straight rods through opposite two mounting through holes.
4. A modular low-voltage switchgear according to claim 3, characterized in that: A straight rod adjacent to the left side of the cabinet door is slidably connected to the cabinet door through a transverse slide rail. The slider of the transverse slide rail is fixedly connected to the right side surface of the straight rod, and the transverse slide rail is fixedly connected to the inner surface of the cabinet door.
5. A modular low-voltage switchgear according to claim 4, characterized in that: The cabinet door is provided with a closing rod that can swing longitudinally. The inner end of the closing rod extends towards the inside of the cabinet body and is connected to a closing handle on the electrical component bracket, and the outer end of the closing rod extends towards the outside of the cabinet body. By pressing down the outer end of the closing rod, the inner end of the closing rod pries the closing handle to close upwards.
6. A modular low-voltage switchgear according to claim 5, characterized in that: The cabinet door is provided with a hinged through hole, and a transverse hinge shaft is provided in the hinged through hole; the middle part of the closing rod is detachably connected to the transverse hinge shaft; a protective cover for shielding the hinged through hole is provided outside the cabinet door, and the closing rod penetrates through the protective cover.
7. A modular low-voltage switchgear according to claim 6, characterized in that: The reset assembly includes a bottom plate and a spring; the lower surface of the bottom plate is fixedly connected to the upper ends of all the straight rods, the two ends of the spring are respectively connected to the upper surface of the bottom plate and the inner surface of the top wall of the cabinet body, and after the electrical component bracket descends, the electrical component bracket is pulled to rise and reset by the elastic force of the spring.
8. A modular low-voltage switchgear according to claim 7, characterized in that: Four springs are provided. The four springs are distributed in a rectangle between the bottom plate and the top wall of the cabinet body. A damping telescopic rod is provided inside each spring, and the two ends of each damping telescopic rod are respectively fixedly connected to the bottom plate and the top wall of the cabinet body.
9. A modular low-voltage switchgear according to claim 8, characterized in that: A wire splitter is provided between the top wall of the cabinet body and the bottom plate. The wire splitter is fixed to the inner surface of the top wall of the cabinet body, and the top wall of the cabinet body is provided with a wire passing through hole corresponding to the wire splitter.
10. A closing method for a suspended modular low-voltage switchgear, characterized in that: For the modular low-voltage cabinet according to claim 9, the steps are as follows: S1. Pull down the electrical component bracket and the cabinet door inside the suspended modular low-voltage cabinet to an appropriate height to expose the electrical component bracket. During the pulling-down process, the winding disc of the wire splitter rotates in the reverse direction to synchronously release the wire; S2. Keep the height of the electrical component bracket after it is pulled down. The closing rod passes through the protective cover and is connected to the horizontal hinge shaft, and the inner end of the closing rod is connected to the closing handle of the electrical component bracket; S3. Press down the outer end of the closing rod, and use the closing rod to pry the closing handle to swing upward for closing; S301. If the closing is successful, disassemble the closing rod and release the electrical component bracket. The electrical component bracket slowly rises and resets under the action of the spring force and the damping telescopic rod; S302. If the closing fails, the shock wave generated by the closing is released from the direction outside the cabinet door, so as to protect the operator standing directly in front of the cabinet door. Check for faults and close again until the closing is successful, and then release the electrical component bracket. The electrical component bracket slowly rises and resets under the action of the spring force and the damping telescopic rod.