A withdrawable low-voltage switchgear assembly

Abstract

This utility model relates to the field of low-voltage switch technology, and in particular to a pull-out type complete low-voltage switchgear, including a cabinet frame and a drawer unit. By setting multiple sets of centering components on both sides of the drawer unit, each set of centering components includes a limiting groove and a limiting strip. The length of the limiting strip is not less than one-third of the drawer unit, which enhances stability. The fit gap does not exceed 0.5mm to ensure positioning accuracy. When pushed in, the limiting strip is embedded in the three-way guide inclined surface structure of the limiting groove to achieve automatic correction, ensuring that the plug and socket are accurately aligned.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage switch technology, and in particular to a withdrawable complete low-voltage switchgear. Background Technology

[0002] Withdrawable low-voltage switchgear is a modular switchgear widely used in industrial power distribution systems. Its core feature is that electrical components such as circuit breakers and contactors are installed in pull-out drawer units. This design facilitates quick maintenance and replacement, while plug-in connections enable electrical conduction between the main and auxiliary circuits. The drawer units are pushed in or pulled out via a guide rail system, combining operational flexibility with safety isolation functions, making it a key piece of equipment in modern power distribution systems.

[0003] However, existing pull-out devices have revealed significant drawbacks during long-term use: frequent pushing and pulling of the drawer unit leads to wear and deformation of the guide rail system, especially in heavy-duty drawers such as those carrying high-current circuit breakers. Because drawers carrying current circuit breakers are heavy and have a high center of gravity, they are prone to lateral eccentricity during pushing and pulling, accelerating mechanical wear of the guide rails and causing problems such as drawer misalignment. This misalignment directly affects the mating accuracy of the primary socket at the rear of the drawer and the cabinet plug. When the drawer is not fully aligned, uneven contact pressure on the mating surfaces leads to increased contact resistance, localized overheating, and even contact burning. Furthermore, misalignment of the secondary control plug can also cause signal transmission interruptions. Existing technologies typically rely on improving the manufacturing precision of the guide rails or adding guide pins to improve alignment, but the former is costly, and the latter takes up space and may interfere with other functional components. Therefore, there is an urgent need for a new guiding mechanism that can effectively suppress drawer misalignment and ensure accurate mating without significantly increasing structural complexity.

[0004] Therefore, this application provides a withdrawable low-voltage switchgear assembly to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this utility model is to provide a pull-out complete low-voltage switchgear to solve the problems of misalignment of plugs and sockets caused by the push-out position deviation of existing drawers.

[0006] To solve the above-mentioned technical problems, this utility model provides a pull-out type complete low-voltage switchgear, including a cabinet frame and drawer units. The cabinet frame is composed of a vertical skeleton and a crossbeam, forming a number of drawer compartments arranged vertically and a busbar compartment located at the rear. A vertical partition is provided between the busbar compartment and the drawer compartments, and a plug is provided on the partition corresponding to each drawer compartment.

[0007] The drawer unit is slidably installed in the drawer compartment, including a side panel and a back panel. The back panel is provided with a socket that mates with a plug. The outer side wall of the side panel is provided with a horizontal sliding strip. The vertical frame of the cabinet is provided with a horizontal guide rail. The guide rail and the sliding strip work together to allow the drawer unit to be pushed, pulled and slid.

[0008] Two sets of centering components are provided on each side of the drawer unit. The two sets of centering components on the same side are located on the upper and lower sides of the guide rail, respectively. The centering components include a limiting groove and a limiting strip. The limiting groove is located on the upper and lower sides of the guide rail, and the limiting strip is located on the side plate of the drawer unit and is horizontally aligned with the limiting groove. When the drawer unit is pushed in, the limiting strip is embedded in the groove of the limiting groove, which restricts the lateral and longitudinal displacement of the drawer unit and ensures that the plug and socket are accurately aligned.

[0009] A further improvement of this utility model is that the interface of the slot body includes three guide slopes, which are located on the upper and lower sides and the outer side of the interface respectively. The interface is gradually reduced along the push-in direction of the drawer unit to form a three-way guide structure. The guide of the interface facilitates the automatic correction and alignment of the limit strip during the push-in process.

[0010] A further improvement of this utility model is that the edges of both the limiting groove and the limiting strip are rounded.

[0011] A further improvement of this utility model is that the length of the limiting strip is not less than one-third of the length of the drawer unit, so as to enhance the limiting stability.

[0012] A further improvement of this utility model is that the limiting groove and the limiting strip are made of high-strength alloy material.

[0013] A further improvement of this utility model is that the depth of the limiting groove is greater than the embedding depth of the limiting strip, ensuring that the drawer unit can still maintain its fine-tuning capability after being pushed into place.

[0014] A further improvement of this utility model is that two sets of limiting grooves on the same side are symmetrically distributed on the upper and lower sides of the guide rail.

[0015] A further improvement of this utility model is that the gap between the limiting strip and the limiting groove does not exceed 0.5mm.

[0016] By adopting the above technical solution, this utility model has the following beneficial effects:

[0017] 1. The present invention provides a withdrawable complete low-voltage switchgear. The device provides multiple sets of centering components on both sides of the drawer unit. Each set of centering components includes mutually cooperating limiting grooves and limiting strips, which can effectively limit the lateral and longitudinal displacement deviation of the drawer unit during the pushing and pulling process, ensuring that the plug and socket always maintain precise centering, and significantly improving the reliability of the electrical connection.

[0018] 2. The present invention provides a withdrawable complete low-voltage switchgear. This device, by designing the interface of the limiting groove as a tapered structure containing three guide ramps, can achieve automatic correction during the process of pushing the drawer in. Even if there is an initial positional deviation, it can guide the limiting strip to accurately embed into the limiting groove, which greatly reduces the difficulty of operation and the requirements for installation accuracy.

[0019] 3. The present invention provides a withdrawable complete low-voltage switchgear. By setting the edges of the limiting groove and the limiting strip to rounded corners, the device not only reduces frictional resistance and makes the push-pull operation smoother, but also avoids mechanical damage that may be caused by sharp edges and corners, thus extending the service life of the device.

[0020] 4. The present invention provides a withdrawable complete low-voltage switchgear. By setting the length of the limit bar to not less than one-third of the length of the drawer unit and using high-strength alloy materials, the stability and durability of the limit structure are significantly enhanced, making it particularly suitable for high-load application scenarios such as high-current circuit breakers.

[0021] 5. The present invention provides a withdrawable complete low-voltage switchgear, which ensures accurate alignment and retains necessary fine-tuning margin by making the depth of the limiting groove greater than the embedding depth of the limiting strip, thereby ensuring reliable electrical connection under various operating conditions.

[0022] 6. The present invention provides a withdrawable complete low-voltage switchgear, which makes the force on the drawer unit more balanced during the pushing and pulling process by symmetrically distributing two sets of limiting grooves on the upper and lower sides of the guide rail on the same side, effectively avoiding the skewing problem caused by unilateral force.

[0023] 7. The present invention provides a withdrawable complete low-voltage switchgear, which, by controlling the fit gap between the limit bar and the limit groove to within 0.5mm, ensures sufficient freedom of movement and achieves precise guiding positioning, thus perfectly balancing the requirements of operational flexibility and centering accuracy. Attached Figure Description

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

[0025] Figure 1 This is a schematic diagram of a withdrawable low-voltage switchgear assembly.

[0026] Figure 2 This is a partial schematic diagram of the drawer compartments and drawer units;

[0027] Figure 3 This is a partial schematic diagram of the drawer compartments and drawer units;

[0028] Figure 4 for Figure 3 An enlarged schematic diagram of part A in the middle;

[0029] Figure 5 for Figure 3 Enlarged schematic diagram of part B;

[0030] Figure 6 This is a schematic diagram of the limiting groove of this utility model;

[0031] Figure 7 This is a schematic diagram of the centering component of this utility model;

[0032] Figure 8 This is a schematic diagram of the centering component of this utility model.

[0033] Attached reference numerals: 1. Cabinet frame; 2. Vertical skeleton; 3. Horizontal beam; 4. Busbar compartment; 5. Drawer compartment; 6. Drawer unit; 61. Side panel; 62. Back panel; 63. Plug; 64. Socket; 65. Guide rail; 66. Sliding strip; 67. Centering assembly; 671. Limiting groove; 672. Groove body; 673. Interlocking interface; 674. Guide slope; 675. Limiting strip; 7. Shelf. Detailed Implementation

[0034] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] The present invention will be further explained below with reference to specific embodiments.

[0038] like Figures 1-8 As shown, this embodiment provides a pull-out type low-voltage switchgear, including a cabinet frame 1 and drawer units 6. The cabinet frame 1 is composed of a vertical skeleton 2 and a crossbeam 3, forming several vertically arranged drawer compartments 5 and a busbar compartment 4 located at the rear. A vertical partition 7 is provided between the busbar compartment 4 and the drawer compartments 5, and a plug 63 is provided on the partition 7 corresponding to each drawer compartment 5. This structural design isolates the busbar compartment 4 and the drawer compartments 5 from each other, ensuring the safety protection of the main busbar and providing a stable installation space for the drawer units 6. The drawer units 6 are slidably installed in the drawer compartments 5, including a side panel 61 and a back panel 62. A socket 64 that mates with the plug 63 is provided on the back panel 62. A horizontal sliding strip 66 is provided on the outer wall of the side panel 61. A horizontal guide rail 65 is provided on the vertical skeleton 2 of the cabinet frame 1. The guide rail 65 and the sliding strip 66 cooperate to allow the drawer units 6 to slide. The modular design not only facilitates maintenance and replacement, but also enables reliable conduction of the main circuit and auxiliary circuit through plug-in connections.

[0039] like Figures 2-5 As shown, in this embodiment, two sets of centering components 67 are respectively arranged on both sides of the drawer unit 6, and the two sets of centering components 67 on the same side are located on the upper and lower sides of the guide rail 65, respectively. A total of four sets of centering components 67 are arranged. The centering component 67 includes a limiting groove 671 and a limiting strip 675. The limiting groove 671 is located on the upper and lower sides of the guide rail 65, and the limiting strip 675 is located on the side plate 61 of the drawer unit 6 and is horizontally aligned with the limiting groove 671. When the drawer unit 6 is pushed in, the limiting strip 675 is embedded in the groove 672 of the limiting groove 671, which restricts the lateral and longitudinal displacement of the drawer unit 6 through mechanical limiting action, effectively avoiding positional deviation caused by wear of the guide rail 65 or center of gravity shift, thereby ensuring that the plug 63 and the socket 64 always maintain precise centering. This structure is particularly suitable for high-load application scenarios such as high-current circuit breakers, which can significantly improve the reliability of electrical connections and reduce problems such as local overheating or contact erosion caused by poor contact.

[0040] like Figures 5-8As shown, in this embodiment, the interface 673 of the slot 672 includes three guide ramps 674, which are located on the upper and lower sides and the outer side of the interface 673, respectively. The upper and lower guide ramps 674 form an angle of 30-60° with the horizontal plane, and the outer guide ramp 674 forms an angle of 30-60° with the vertical plane. The interface 673 is gradually tapered along the push-in direction of the drawer unit 6, forming a three-way guide structure. This facilitates automatic correction during the drawer push-in process. Even if there is an initial positional deviation, the guide action of the ramps can guide the limiting strip 675 to accurately embed into the limiting groove 671, reducing the difficulty of operation and the requirements for installation accuracy. The edges of the limiting groove 671 and the limiting strip 675 are rounded, which not only reduces frictional resistance and makes the push-pull operation smoother, but also avoids mechanical damage that may be caused by sharp edges, extending the service life of the equipment. The length of the limiting strip 675 is not less than one-third of the length of the drawer unit 6 to enhance limiting stability and ensure that the drawer unit 6 is subjected to balanced force during pushing and pulling, avoiding skew problems caused by force on one side. The limiting groove 671 and the limiting strip 675 are made of high-strength alloy materials, preferably alloy steel and cast iron, which have excellent wear resistance and economy, and can meet the needs of long-term frequent pushing and pulling conditions. The groove 672 of the limiting groove 671 is deeper than the embedding depth of the limiting strip 675, which ensures precise centering and retains the necessary fine adjustment margin to ensure reliable electrical connection under various working conditions. The two sets of limiting grooves 671 on the same side are symmetrically distributed on the upper and lower sides of the guide rail 65, further optimizing the force distribution and improving the overall stability of the system. The fitting gap between the limiting strip 675 and the limiting groove 671 does not exceed 0.5mm, which ensures sufficient freedom of movement while achieving precise guiding positioning, balancing the requirements of operational flexibility and centering accuracy. The centering component 67 effectively solves the problems of wear on the guide rail 65, positional deviation, and misalignment of the plug 63 and socket 64 caused by drawer sliding in the prior art. It achieves a stable and reliable electrical connection without significantly increasing the structural complexity and has broad application prospects.

[0041] This utility model also provides a working principle for a withdrawable complete low-voltage switchgear:

[0042] The operator pulls the operating handle at the front of the drawer unit 6, causing the sliding strip 66 on the side panel 61 to move smoothly along the guide rail 65 on the vertical frame 2 of the cabinet frame 1. During the pushing process, the limiting strips 675 on both sides of the drawer unit 6 gradually approach the limiting groove 671. Through the automatic correction effect of the three-way guide slope 674, the limiting strip 675 is ensured to be accurately embedded in the groove 672. At this time, the socket 64 on the back panel 62 and the plug 63 on the partition 7 of the busbar compartment 4 are completely aligned. When the drawer unit 6 is fully pushed into the working position, the tight cooperation between the limiting groove 671 and the limiting strip 675 effectively restricts lateral and longitudinal displacement, keeping the main circuit plug surface in uniform contact pressure. At the same time, the wear-resistant structure of the guide rail 65 and the sliding strip 66 ensures smooth pushing and pulling over the long term. When disconnection is required, the drawer unit 6 is pulled out in the opposite direction, and the limiting strip 675 smoothly disengages from the limiting groove 671 along the guide slope 674, separating the socket 64 on the back panel 62 from the plug 63 on the partition 7 of the busbar compartment 4.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A withdrawable complete low-voltage switchgear, characterized in that, It includes a cabinet frame (1) and drawer units (6). The cabinet frame (1) is composed of a vertical frame (2) and a crossbeam (3), forming several drawer compartments (5) arranged vertically and horizontally and a busbar compartment (4) located at the rear. A vertical partition (7) is provided between the busbar compartment (4) and the drawer compartments (5). A plug (63) is provided on the partition (7) corresponding to each drawer compartment (5). The drawer unit (6) is slidably installed in the drawer compartment (5), including a side panel (61) and a back panel (62). The back panel (62) is provided with a socket (64) that mates with the plug (63). The outer side wall of the side panel (61) is provided with a horizontal sliding strip (66). The vertical frame (2) of the cabinet frame (1) is provided with a horizontal guide rail (65). The guide rail (65) and the sliding strip (66) work together to allow the drawer unit (6) to be pushed, pulled and slid. Two sets of centering components (67) are respectively provided on both sides of the drawer unit (6). The two sets of centering components (67) on the same side are located on the upper and lower sides of the guide rail (65). The centering component (67) includes a limiting groove (671) and a limiting strip (675). The limiting groove (671) is located on the upper and lower sides of the guide rail (65). The limiting strip (675) is located on the side plate (61) of the drawer unit (6) and is horizontally aligned with the limiting groove (671). When the drawer unit (6) is pushed in, the limiting strip (675) is embedded in the groove (672) of the limiting groove (671) to limit the lateral and longitudinal displacement of the drawer unit (6) and ensure that the plug (63) and the socket (64) are accurately aligned.

2. The withdrawable low-voltage switchgear according to claim 1, characterized in that, The interface (673) of the slot (672) includes three guide ramps (674). The three guide ramps (674) are located on the upper and lower sides and the outer side of the interface (673) respectively. The interface (673) is gradually reduced along the pushing direction of the drawer unit (6) to form a three-way guide structure. The guide of the interface (673) facilitates the automatic correction and alignment of the limit strip (675) during the pushing process.

3. The withdrawable low-voltage switchgear according to claim 1, characterized in that, The edges of the limiting groove (671) and the limiting strip (675) are rounded.

4. The withdrawable low-voltage switchgear according to claim 1, characterized in that, The length of the limit bar (675) is not less than one-third of the length of the drawer unit (6) to enhance the stability of the limit.

5. The withdrawable low-voltage switchgear according to claim 1, characterized in that, The limiting groove (671) and the limiting strip (675) are made of high-strength alloy material.

6. The withdrawable low-voltage switchgear according to claim 1, characterized in that, The groove (672) of the limiting groove (671) is deeper than the embedding depth of the limiting strip (675) to ensure that the drawer unit (6) can still maintain its fine-tuning capability after being pushed into place.

7. The withdrawable low-voltage switchgear according to claim 1, characterized in that, Two sets of limiting grooves (671) on the same side are symmetrically distributed on the upper and lower sides of the guide rail (65).

8. The withdrawable low-voltage switchgear according to claim 1, characterized in that, The clearance between the limiting strip (675) and the limiting groove (671) shall not exceed 0.5 mm.

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