Modular low-voltage switch cabinet and closing method of suspended modular low-voltage switch cabinet

Abstract

The invention discloses a modularized low-voltage switch cabinet and a switching-on method of a suspended modularized low-voltage switch cabinet. The modularized low-voltage switch cabinet comprises a cabinet body, a cabinet door and an electrical element support. The front side wall and the bottom wall of the cabinet body are respectively provided with an opening matched with the cabinet door and the electrical element support, and the inner surface of the left side wall and the inner surface of the right side wall of the cabinet body are respectively provided with a plurality of longitudinal grooved limiting rails. The electrical element support comprises a longitudinal straight rod, a transverse installation track and a reset assembly. A straight rod is arranged in the sliding groove of each grooved limiting rail, and the straight rods on the left side are opposite to the straight rods on the right side in a one-to-one mode. At least one installation track is arranged between every two 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. All electrical elements on the electrical element bracket can be synchronously moved downwards to a position with a proper height in a manner of pulling down the electrical element bracket, and then subsequent operations such as repair, maintenance, troubleshooting and switching on are carried out.

Description

Technical Field

[0001] The present invention belongs to the field of circuit devices, and in particular relates to a modular low-voltage switch cabinet and a closing method of a suspended modular low-voltage switch 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, which plays a vital role in energy supply devices. The structure of low voltage switch cabinet mainly includes cabinet part 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] Traditional low-voltage cabinets are mostly installed in machine rooms, workshops or factories, floor distribution box rooms or special distribution rooms, distribution rooms, etc. With the rise of new energy vehicles, new energy charging stations are being built rapidly in various places, and low-voltage switch cabinets have become one of the indispensable equipment in new energy energy supply circuits. The conventional installation method of the switch cabinet of a new energy charging station is to fix it to the ground with fastening bolts, but due to the limitations of space and use conditions of some indoor charging stations, there are also special installation methods. For example, the existing new energy charging stations are installed overhead, and the low-voltage cabinet is supported by a steel frame structure to meet the height requirements from the ground. This overhead installation method has many advantages such as "not taking up ground space", "not being affected by ground moisture", and "low probability of being collided", but it 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.

[0004] 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

[0005] In view of the deficiencies in the prior art, the present invention provides a modular low-voltage switch cabinet, comprising a cabinet body, a cabinet door and an electrical component bracket; the front side wall and the bottom wall of the cabinet body are respectively provided with openings adapted to the cabinet door and the electrical component bracket, and the inner surfaces of the left side wall and the right side wall of the cabinet body are respectively provided with a plurality of longitudinal grooved limit rails; the electrical component bracket comprises a longitudinal straight rod, a transverse mounting rail and a reset assembly; each sliding groove of the grooved limit rail is provided with a straight rod, and the straight rod on the left side is opposite to the straight rod on the right side one by one; at least one mounting rail is provided between each two 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 of the front side wall of the cabinet body, and the electrical component bracket is pulled down by an external force, so that the electrical component bracket extends out from the opening of the bottom wall of the cabinet body and the cabinet door moves down synchronously and the reset assembly stores energy.

[0006] Preferably, the number of the grooved limit rails on the left side wall and the right side wall of the cabinet is the same and at least two are provided, and all the grooved limit rails are distributed at equal intervals along the front-to-back direction. The grooved limit rails are distributed in pairs on the left and right, and each pair of grooved limit rails forms a layer of electrical component installation, and at least two layers are provided. The number of pairs of grooved limit rails can also be increased according to installation requirements.

[0007] Preferably, the transverse width of each straight rod is greater than the depth of the slide groove of the grooved limiting rail, and the portion of each straight rod that exceeds the corresponding slide groove is provided with a row of longitudinally distributed mounting holes, and all mounting holes of two 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 two opposite mounting holes. Since the straight rod and the mounting rail will rise and fall synchronously, the connection portion of the mounting rail and the straight rod needs to exceed the slide groove, and the connection portion does not affect the lifting and lowering of the electrical component bracket. The mounting rail and the straight rod are detachably connected by bolts, and the installation height of the two adjacent mounting rails can be adjusted according to the longitudinal spacing installation requirements of the electrical components, and the adjustment is flexible.

[0008] 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 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 structure to replace the existing hinge opening structure. The purpose is that the transverse slide rail limits the forward and backward movement of the cabinet door. If an electrical explosion occurs, the cabinet door is restricted by the transverse slide rail, which can prevent the shock wave from propagating forward. The cabinet door and the transverse slide rail bear the shock wave, thereby protecting the closing personnel. The existing hinged cabinet door does not have this protection function.

[0009] Preferably, the cabinet door is provided with a closing rod that can swing longitudinally, the inner end of the closing rod extends to the inside of the cabinet and is connected to the closing handle on the electrical component bracket, and the outer end of the closing rod extends to the outside of the cabinet, and the inner end of the closing rod is pressed down to pry the closing handle upward to close the switch. Compared with the existing open-door closing method, the closed-door closing method has a higher safety factor and better protection effect on the closing personnel. The cabinet door is provided with a hinged through hole, and a transverse hinge shaft is provided in the hinged through hole, and 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 divided into two sections. The end of each section is provided with an external thread, and the transverse hinge shaft is provided with two threaded holes. The two sections of the closing rod are detachably connected to the transverse hinge shaft through threads. After the closing is completed, the two sections of the closing rod are detached from the front and rear of the cabinet door respectively, which does not affect the normal use of the cabinet door. In addition, a protective cover for shielding the hinged through hole is provided on the outside of the cabinet door, and the closing rod passes through the protective cover. The protective cover seals the hinged through hole to prevent the shock wave from overflowing the hinged through hole, thereby improving the safety level.

[0010] 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, and the electrical component bracket is pulled up and reset by the elastic force of the spring after the electrical component bracket is lowered. Specifically, there are four springs, which are distributed between the bottom plate and the top wall of the cabinet in a rectangular shape, and a damping telescopic rod is provided on the inner side of 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. After each electrical component is synchronously lowered with the electrical component bracket and the cabinet door, a pull rope, a weight, etc. can be set under the electrical component bracket to keep the electrical component bracket in the position after the lowering. After the repair and maintenance are completed, the pull rope and the weight are separated to release the electrical component bracket, and the electrical component bracket is reset under the elastic force of the spring. During the rising process, it is subjected to the resistance of the damping telescopic rod, which hinders the spring from oscillating up and down, so that the electrical component bracket and the cabinet door are slowly and steadily raised and reset. In addition, a wire splitter is provided between the top wall and the bottom plate of the cabinet, the wire splitter is fixed to the inner surface of the top wall of the cabinet, and the top wall of the cabinet is provided with a wire through hole corresponding to the wire splitter. The external access wire passes through the wire through hole into the cabinet and is electrically connected to the wire splitter. The winding reel on the wire splitter stores wires of sufficient length to meet the lifting and lowering of the electrical component bracket, so the lifting function of the electrical component bracket does not conflict with the electrical connection relationship between the low-voltage cabinet and the external access wire.

[0011] The beneficial effects of the modular low-voltage switchgear in the present invention are: 1. After the low-voltage cabinet is installed in the air, all electrical components on the electrical component bracket can be simultaneously moved down to a position with a suitable height by pulling down the electrical component bracket, and then subsequent repairs, maintenance, troubleshooting, closing and other operations can be carried out on the ground without the need for ladders, high stools and other tools. It is no different from the maintenance method of existing ground low-voltage cabinets, but compared with the existing suspended low-voltage cabinets, the maintenance difficulty is reduced and the operation is simpler.

[0012] 2. Since the cabinet door integrates secondary components such as indicator lights, meters, and controllers, there is an electrical connection between the secondary components and the electrical components on the electrical component bracket. The cabinet door and the electrical component bracket are connected together, and the two can be raised and lowered synchronously, and all 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 electrical components, cabinet doors, and electrical component brackets form a module that can be raised and lowered, meeting the lifting requirements while meeting the circuit connection requirements.

[0013] 3. Compared with the closing operation of the existing suspended low-voltage cabinet, closing on the ground is safer. Even if a closing failure occurs, there is no risk of falling for the closing personnel, and the safety level is higher.

[0014] 4. The electrical component bracket is different from the existing bracket. The electrical component bracket has a lifting function, which not only meets the requirement of convenient maintenance of the suspended low-voltage cabinet, but more importantly, improves the safety level of closing the switch. If a closing explosion occurs, the existing low-voltage cabinet can only release pressure in the direction of the cabinet door (the cabinet door is in an open state when closing the switch), while the other side walls of the cabinet body play a negative role, that is, gathering the explosion energy, and a large amount of released heat energy, mechanical energy, etc. are gathered in the cabinet body and released from the front side of the cabinet body, and the released power is greater. After the electrical component bracket in the present invention is lowered, all electrical components are exposed. If an electrical explosion occurs, the energy of the explosion is instantly released in the surrounding space, and the pressure is released in the open area, which greatly weakens the explosion power and reduces the probability of personal injury accordingly.

[0015] The present invention provides a closing method for a suspended modular low-voltage switch cabinet. Based on the above modular low-voltage switch cabinet, the steps are as follows: First, pull down the electrical component bracket and the cabinet door inside the suspended modular low-voltage switch cabinet to a suitable height to expose the electrical component bracket. During the pull-down process, the winding reel of the wire distributor rotates in the opposite direction to release the wires synchronously. Keep the height of the electrical component bracket after being pulled down, and 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.

[0016] Then, press down the outer end of the closing rod, and use the closing rod to pry the closing handle upward to swing it to close the circuit.

[0017] Finally, there are two situations for closing the switch. First, if the closing is successful, the closing rod is disassembled, the electrical component bracket is released, and the electrical component bracket slowly rises and resets under the action of the spring force and the damping telescopic rod. Second, 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 in front of the cabinet door, troubleshooting the fault and reclosing the switch until the closing is successful, and then the electrical component bracket is released, and the electrical component bracket slowly rises and resets under the action of the spring force and the damping telescopic rod.

[0018] The closing method of the present invention has the following advantages: All electrical components are concentrated on the electrical component bracket and the cabinet door. When the electrical component bracket is lowered, all electrical components are exposed. If an electrical explosion occurs, the electric arc and shock wave generated by the explosion can be discharged from the back, left, right, etc., and the cabinet door acts as a shelter to protect the closing personnel standing in front of the cabinet door, greatly improving the safety factor of the closing method and significantly improving the protection effect on personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a modular low-voltage switch cabinet in the present invention; Figure 2 for Figure 1 Schematic diagram of the hidden protective cover; Figure 3 for Figure 2 Schematic diagram of the hidden cabinet doors.

[0021] Figure numerals: cabinet body 1, cabinet door 2, electrical component bracket 3, opening 4, grooved limit rail 5, wire distributor 6, wire through hole 7, straight rod 8, mounting rail 9, reset assembly 10, mounting 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, hinged through hole 20, limit hook 21, limit rod 22. DETAILED DESCRIPTION

[0022] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principle, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0023] Embodiment 1; like Figure 1 As shown, the first embodiment provides a modular low-voltage switch cabinet, including a cabinet body 1, a cabinet door 2 and an electrical component bracket 3, wherein the front side wall and the bottom wall of the cabinet body 1 are respectively provided with openings 4 adapted to the cabinet door 2 and the electrical component bracket 3, wherein the opening 4 of the bottom wall can be provided with an adapted baffle, which can be opened before maintenance, and the baffle is not drawn in the figure. The cabinet door 2 adopts a sideways sliding door opening method, and the electrical component bracket 3 can extend from the bottom wall of the cabinet body 1, which is particularly suitable for suspended installation requirements.

[0024] The specific connection structure of the cabinet 1 is as follows: Three longitudinal grooved limit rails 5 are respectively provided on the inner surface of the left wall and the inner surface of the right wall of the cabinet 1, but are not limited to three, and may be two, or four, etc. Specifically, the number of the grooved limit rails 5 on the left wall and the right wall of the cabinet 1 is the same, that is, both are three, and all the grooved limit rails 5 are distributed at equal intervals along the front-to-back direction. The grooved limit rails 5 are distributed in pairs on the left and right, and each pair of grooved limit rails 5 forms a layer for installing electrical components, and the number of pairs of grooved limit rails 5 can also be increased according to installation requirements. A wire splitter 6 is fixedly installed on the top wall of the cabinet 1, and a wire through hole 7 corresponding to the wire splitter 6 is provided on the top wall of the cabinet 1. The external access line passes through the cabinet 1 through the wire through hole 7 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 1. The winding reel of the wire splitter 6 has its own torsion spring. A certain length of wire is stored on the winding reel. After the wire is pulled out, it can be automatically wound around the winding reel and reset under the action of the torsion spring.

[0025] 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; each slide groove of the grooved limiting rail 5 is provided with a straight rod 8, and the left straight rod 8 is opposite to the right straight rod 8 one by one; three mounting rails 9 are provided between each two opposite straight rods 8, or two, or four, etc. The mounting rail 9 adopts the existing standard rail, that is, the TH35mm rail, and the electrical components are connected to the mounting rail 9, and the installation method is the same as 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 slide groove of the grooved limiting rail 5, and each straight rod 8 The part that exceeds the corresponding slide groove is provided with a row of longitudinally distributed mounting through holes 11, and all the mounting through holes 11 of each two opposite straight rods 8 are opposite to each other, and the two 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 can be raised and lowered synchronously, the connection part between the mounting rail 9 and the straight rod 8 needs to exceed the slide slot, and the connection part does not affect the lifting and lowering of the electrical component bracket 3. The mounting rail 9 and the straight rod 8 are detachably connected by bolts, and the installation height of two adjacent mounting rails 9 can be adjusted according to the longitudinal spacing installation requirements of the electrical components, and the adjustment is flexible.

[0026] In addition, in order to limit the maximum descending distance of the electrical component bracket 3, a limit hook 21 is provided at the lower part of each grooved limit rail 5, and a limit rod 22 corresponding to the limit hook 21 is provided at the upper part of each straight rod 8. When the limit rod 22 falls on the limit hook 21, the electrical component bracket 3 reaches the maximum descending distance, which can prevent the electrical component bracket 3 from completely falling off from the cabinet 1.

[0027] After the electrical component support 3 is lowered, 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 1. The specific structure of the reset assembly 10 is as follows: The reset assembly 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 1. After the electrical component bracket 3 is lowered, the electrical component bracket 3 is pulled up and reset by the elastic force of the spring 14. Specifically, there are four springs 14, which are distributed in a rectangular shape between the bottom plate 13 and the top wall of the cabinet 1. A damping telescopic rod 15 is provided on the inner side of each spring 14, and the two ends of each damping telescopic rod 15 are respectively fixedly connected to the bottom plate 13 and the top wall of the cabinet 1. After each electrical component is synchronously lowered with the electrical component bracket 3 and the cabinet door 2, a pull rope, a heavy object, etc. can be set below the electrical component bracket 3 to keep the electrical component bracket 3 in the position after the lowering. After repair and maintenance, the pull rope and weight are separated to release the electrical component bracket 3. The electrical component bracket 3 is reset under the elastic force of the spring 14. During the rising process, it is resisted by the damping telescopic rod 15, which prevents 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.

[0028] The cabinet door 2 in this embodiment 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, and a slider 17 of the transverse slide rail 16 is fixedly connected to the right side 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 of the inner side of the cabinet door 2. The cabinet door 2 adopts a transverse sliding structure. After the electrical component bracket 3 and the cabinet door 2 are synchronously lowered, 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, and the purpose is that the transverse slide rail 16 limits the forward and backward movement of the cabinet door 2. If an electrical explosion accident occurs, the cabinet door 2 is limited by the transverse slide rail 16, which can prevent the shock wave from propagating forward, and the cabinet door 2 and the transverse slide rail 16 bear the shock wave, thereby protecting the closing personnel. The existing hinged opening cabinet door 2 does not have this protection function.

[0029] The existing low-voltage cabinet adopts the open-door closing method, while the cabinet door 2 in this embodiment adopts the closed-door closing method, which is achieved 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 to the inside of the cabinet 1 and is connected to the closing handle on the electrical component bracket 3, and the outer end of the closing rod 18 extends to the outside of the cabinet 1. By pressing down the outer end of the closing rod 18, the inner end of the closing rod 18 pries the closing handle upward to close the circuit. The closing handle here refers to the switch handle on the 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 open-door closing method, the closed-door closing method has a higher safety factor and better protection effect on the closing personnel. The cabinet door 2 is provided with a hinged through hole 20, and a transverse hinge shaft 19 is provided 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 divided into two sections. The end of each section is provided with an external thread, and the transverse hinge shaft 19 is provided with two threaded holes. The two sections of the closing rod 18 are detachably connected to the transverse hinge shaft 19 through threads. After the closing is completed, one section of the closing rod 18 can be detached from the rear through the electrical component bracket 3, and then another section of the closing rod 18 can be detached from the front of the cabinet door 2. After the detachment, the normal use of the cabinet door 2 is not affected. In addition, a protective cover 12 for shielding the hinge through hole 20 is provided on the outside of the cabinet door 2, and the closing rod 18 passes through the protective cover 12. The protective cover 12 seals the hinge through hole 20 to prevent the shock wave from overflowing from the hinge through hole 20, thereby improving the safety level.

[0030] The cabinet 1 of this embodiment can be installed on a suspended fixed frame, so as 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 repair and maintenance on the ground, and the closing is safer. Even if a closing failure occurs, the closing personnel will not have the risk of falling, and the safety level is higher.

[0031] Embodiment 2: Embodiment 2 provides a method for closing a suspended modular low-voltage switch cabinet. Based on the modular low-voltage switch cabinet of embodiment 1, the method is as follows: First, the electrical component support 3 and the cabinet door 2 inside the suspended modular low-voltage switch cabinet are pulled down to a suitable height to expose the electrical component support 3. During the pulling down process, the winding drum of the wire splitter 6 rotates in the opposite direction to release the wires synchronously. The height of the electrical component support 3 after being pulled down is maintained, and the closing rod 18 passes through the protective cover 12 and 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 support 3.

[0032] Then, the outer end of the closing rod 18 is pressed down, and the closing handle is pried by the closing rod 18 to swing upward to close the circuit.

[0033] Finally, there are two situations for closing the switch. First, if the closing is successful, the closing rod 18 is disassembled, 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. Second, if the closing fails, the shock wave generated by the closing is released from the direction other than the cabinet door 2, thereby protecting the operator standing in front of the cabinet door 2, troubleshooting the fault and reclosing the switch until the closing is successful, and then 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.

[0034] Compared with the existing closing method, the closing method of this embodiment is simpler to operate and eliminates the complicated closing operation process. All electrical components are concentrated on the electrical component bracket 3 and the cabinet door 2. After the electrical component bracket 3 is lowered, all electrical components are exposed. If an electrical explosion occurs, the arc, shock wave, etc. generated by the explosion can be discharged from the rear, left, right, etc., and the cabinet door 2 acts as a shelter to protect the closing personnel standing in front of the cabinet door 2, thereby greatly improving the safety factor of the closing method and significantly improving the protection effect on personnel.

[0035] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people 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 limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention. All 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: Including cabinet body, cabinet door and electrical component bracket; The front side wall and the bottom wall of the cabinet are respectively provided with openings adapted to the cabinet door and the electrical component bracket, and the inner surface of the left wall and the inner surface of the right wall of the cabinet are respectively provided with a plurality of longitudinal grooved limit rails; The electrical component bracket includes a longitudinal straight rod, a transverse mounting rail and a reset assembly; each slide slot of the slotted limit rail is provided with a straight rod, and the straight rods on the left side are opposite to the straight rods on the right side one by one; at least one mounting rail is provided between each two 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; The cabinet door is connected to the electrical component bracket through a connecting piece and is located at the opening of the front side wall of the cabinet. The electrical component bracket is pulled down by external force, so that the electrical component bracket extends from the opening of the bottom wall of the cabinet and the cabinet door moves down synchronously and the reset component stores energy.

2. The modular low-voltage switchgear according to claim 1, characterized in that: The number of the grooved limiting rails on the left side wall and the grooved limiting rails on the right side wall of the cabinet is the same and at least two are provided, and all the grooved limiting rails are distributed at equal intervals along the front-to-back direction.

3. The modular low-voltage switchgear according to claim 1, characterized in that: The lateral width of each straight rod is greater than the depth of the slide groove of the grooved limit rail. The portion of each straight rod that exceeds the corresponding slide groove is provided with a row of longitudinally distributed mounting holes. All mounting holes of two 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 two opposite mounting holes.

4. The modular low-voltage switchgear according to claim 3 is 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, a slider of the transverse slide rail is fixedly connected to the right side of the straight rod, and the transverse slide rail is fixedly connected to the inner surface of the cabinet door.

5. The 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 toward the interior of the cabinet and is connected to the closing handle on the electrical component bracket, and the outer end of the closing rod extends toward the outside of the cabinet. By pressing down the outer end of the closing rod, the inner end of the closing rod pries the closing handle upward to close the circuit.

6. The modular low-voltage switchgear according to claim 5, characterized in that: The cabinet door is provided with a hinged through hole, in which a transverse hinged shaft is provided, and the middle part of the closing rod is detachably connected to the transverse hinged shaft; the outside of the cabinet door is provided with a protective cover for shielding the hinged through hole, and the closing rod passes through the protective cover.

7. The modular low-voltage switchgear according to claim 6, characterized in that: The reset assembly includes a base plate and a spring; the lower surface of the base plate is fixedly connected to the upper ends of all straight rods, and the two ends of the spring are respectively connected to the upper surface of the base plate and the inner surface of the top wall of the cabinet. After the electrical component bracket is lowered, the elastic force of the spring pulls the electrical component bracket up and resets.

8. The modular low-voltage switchgear according to claim 7, characterized in that: There are four springs, which are distributed in a rectangular shape between the bottom plate and the top wall of the cabinet. A damping telescopic rod is provided on the inner side of each spring, and both ends of each damping telescopic rod are fixedly connected to the bottom plate and the top wall of the cabinet respectively.

9. The modular low-voltage switchgear according to claim 8, characterized in that: A wire splitter is arranged between the top wall and the bottom plate of the cabinet, the wire splitter is fixed to the inner surface of the top wall of the cabinet, and the top wall of the cabinet is provided with a wire through hole corresponding to the wire splitter.

10. A closing method for a suspended modular low-voltage switchgear, characterized in that: Based on the modular low-voltage switchgear 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 switch cabinet to a suitable height so that the electrical component bracket is exposed. During the pulling down process, the winding reel of the wire distributor rotates in the opposite direction to release the wires synchronously; S2. Maintain the height of the electrical component support after it is pulled down, the closing rod passes through the protective cover and is connected to the transverse hinge shaft, and the inner end of the closing rod is connected to the closing handle of the electrical component support; S3. Press down the outer end of the closing rod, and use the closing rod to pry the closing handle upward to swing it to close the circuit breaker. S301, if the closing is successful, the closing rod is disassembled, the electrical component bracket is released, and the electrical component bracket slowly rises and resets under the action of the spring force and the damping telescopic rod; S302. If the closing operation fails, the shock wave generated by the closing operation is released from the direction outside the cabinet door, thereby protecting the operator standing in front of the cabinet door. The operator then checks the fault and closes the switch again until the closing operation succeeds. The electrical component bracket is then released and slowly rises and resets under the action of the spring force and the damping telescopic rod.

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