A shield for low voltage switchgear

Abstract

The utility model relates to low -voltage distribution switch protection technical field especially, a kind of protection for low-voltage complete switchgear, including cabinet, multiple rows of guide rails are provided on the backplate of cabinet, circuit breaker and other electrical elements are installed on guide rail;Circuit breaker's wiring hole is detachably inserted with protection, protection is integrally formed insulating part, protection has column body, the outer wall shape of column body is matched with the inner wall of wiring hole and interference fit;The top of column body is provided with protection plate, protection plate is set to the top of column body and extends to outer periphery, wire passage is set through along the axial direction of column body and protection plate, to supply wire and form insulation surrounding to the bare core in wire, effectively solve the circuit breaker wiring terminal because of bare core too long or wiring hole long-term open and cause phase-to-phase short circuit, grounding fault and creeping flashover problem.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage power distribution switch protection technology, and in particular to a protective component for low-voltage switchgear. Background Technology

[0002] Low-voltage switchgear assemblies are core devices in power distribution systems that realize "power reception—distribution—control—protection." A typical structure includes a cabinet, busbar system, functional units, secondary control circuits, and ventilation and heat dissipation system. The circuit breaker, as the most critical primary component within the functional unit, undertakes the triple mission of "closing for power supply, opening for power disconnection, and overload / short circuit / ground fault protection." The reliability of its terminal connections to external cables directly determines the safe operation level of the entire cabinet.

[0003] However, when circuit breakers are crimped to cable terminals at construction sites, operators generally rely on personal experience to strip the wires. This results in inconsistent lengths of exposed wire cores after crimping, making it easy for the exposed wire cores to lap against adjacent phase conductors or grounding metal components, inducing phase-to-phase short circuits and grounding faults. At the same time, the wiring holes are left open for a long time, allowing dust, metal debris, and moisture to continuously intrude. When the dust layer becomes damp, it forms a conductive film, which shortens the creepage distance, reduces insulation resistance, and easily causes creepage flashover accidents.

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

[0005] The purpose of this utility model is to provide a protective component for low-voltage switchgear, which solves the problems of phase-to-phase short circuits, grounding faults and creepage flashovers caused by inconsistent exposed wire core lengths and long-term open wiring holes in the prior art.

[0006] To solve the above-mentioned technical problems, this utility model provides a protective component for low-voltage switchgear, including a cabinet, with multiple rows of guide rails on the back panel of the cabinet, and circuit breakers and other electrical components installed on the guide rails; the protective component is detachably inserted into the wiring hole on the circuit breaker, the protective component is an integrally formed insulating component, the protective component has a column, the outer wall shape of the column matches the inner wall of the wiring hole and is interference fit; a protective plate is provided at the top of the column, the protective plate is set at the top of the column and extends outward, and a wire passage is provided through the axial direction of the column and the protective plate to allow the wires to pass through and to form an insulating enclosure for the exposed wire cores in the wires.

[0007] A further improvement of this utility model is that the protective component is made of flame-retardant ABS or polycarbonate, and the overall height of the protective component is at least 10 mm higher than the depth of the wiring hole.

[0008] A further improvement of this utility model is that: at least one annular rib is provided on the lower part of the outer wall of the column, and when the column is inserted into the wiring hole, the annular rib is used to enhance the interference fit strength with the inner wall of the wiring hole.

[0009] A further improvement of this utility model is that the inner wall of the wire passage maintains a gap of 0.05-0.2mm with the outer surface of the wire to facilitate the insertion of the wire.

[0010] A further improvement of this utility model is that the column and the protective plate are divided into two independent but combinable semi-columns along their axial direction; at least two protrusions are provided on the combing surface of one semi-column, and grooves that cooperate with the protrusions are provided on the opposite surface of the other semi-column; when the two semi-columns are combinated, the protrusions are inserted into the corresponding grooves to achieve a fixed connection between the two semi-columns.

[0011] A further improvement of this utility model is that: the wire passage is composed of a first wire passage and a second wire passage; the first wire passage runs through the axial direction of the column, and the second wire passage runs through the axial direction of the protective plate, and the two are interconnected; a gap of 0.05 mm to 0.2 mm is left between the inner circumferential surface of the second wire passage and the outer surface of the wire; the diameter of the second wire passage is smaller than the diameter of the first wire passage.

[0012] A further improvement of this utility model is that the column and the protective plate are divided into two independent but combinable semi-columns along their axial direction; at least two protrusions are provided on the combing surface of one semi-column, and grooves that cooperate with the protrusions are provided on the opposite surface of the other semi-column; when the two semi-columns are combinated, the protrusions are inserted into the corresponding grooves to achieve a fixed connection between the two semi-columns.

[0013] A further improvement of the present invention is that: the column includes a plug-in column, the plug-in column is provided with a through-path for the wire, the outer wall shape of the plug-in column matches the inner wall of the wiring hole and is interference fit, a support column is provided at each of the four corners of the bottom end of the plug-in column, and at least one annular rib is provided on the outer wall of the plug-in column to enhance the interference fit strength with the inner wall of the wiring hole. When the plug-in column is inserted into the wiring hole, the support column has the functions of auxiliary support and forming a heat dissipation space.

[0014] A further improvement of this utility model is that: the column and the protective plate are divided into two independent but combinable half-columns along their axial direction; the half-column is provided with at least two protrusions on the splicing surface of the plug-in column, and the other half-column is provided with corresponding grooves that cooperate with the protrusions on the opposite surface of the plug-in column; when the two half-columns are assembled, the protrusions are inserted into the corresponding grooves to achieve a fixed connection between the two half-columns.

[0015] By adopting the above technical solution, this utility model has the following beneficial effects: 1. This utility model provides a protective component for low-voltage switchgear. This component, consisting of an integrally molded insulating part including a column and a protective plate, is inserted into the circuit breaker wiring hole and features an axially continuous wire passage, effectively solving the safety hazards and environmental pollution problems associated with exposed wire cores. Specifically, the interference fit between the column and the inner wall of the wiring hole ensures a stable installation of the protective component, preventing it from loosening during use. The protective plate at the top of the column extends outwards, providing dust and water protection as well as electrical isolation and limiting movement. Simultaneously, the continuous wire passage design allows the inner wall of the passage to form a circumferential, continuous insulating enclosure around the exposed wire core after stripping. This enclosure structure forcibly confines the exposed wire core within the insulating passage. Even if operator errors during wire stripping result in a slightly longer exposed wire core, it effectively prevents accidental contact with adjacent phase conductors or metal components of the switchgear, avoiding phase-to-phase short circuits or grounding faults caused by exposed wire cores, thus improving the safety and reliability of low-voltage switchgear operation.

[0016] 2. This utility model provides a protective component for low-voltage switchgear. This protective component precisely controls the circumferential gap between the inner wall of the wire passage and the outer surface of the conductor to 0.05-0.2 mm, ensuring that the conductor can be easily passed through while the exposed conductor core is uniformly insulated around it. This eliminates the short-circuit risk of "exposed conductor core overlapping adjacent phase wires due to inconsistent stripping lengths" in the prior art. At the same time, the tiny gap forms a capillary barrier, further preventing moisture from seeping into the terminal along the conductor, thus achieving a seal.

[0017] 3. The present invention provides a protective component for low-voltage switchgear. The protective component is divided into two combinable semi-cylinders along the axial direction by the column and the protective plate, and a protrusion-groove insertion structure is provided on the combinable cut surface. This allows the protective component to "wrap" the conductor from the side after the cable has been crimped, and can be installed on site without disassembling the wire.

[0018] 4. The present invention provides a protective component for low-voltage switchgear, wherein the overall height of the protective component is at least 10 mm higher than the depth of the wiring hole, and at least one annular rib is provided on the outer wall of the column, which significantly enhances the reliability of the protection and the firmness of the installation. Attached Figure Description

[0019] 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.

[0020] Figure 1 A schematic diagram of a protective component for low-voltage switchgear assemblies; Figure 2 A schematic diagram of the circuit breaker and its protective components; Figure 3 A cross-sectional view of the conductor and protective components; Figure 4 This is a schematic diagram of the protective component structure in Example 1; Figure 5 This is a schematic diagram of the protective component and protrusions in Example 2; Figure 6 This is a schematic diagram of the protective component and groove in Example 2; Figure 7 This is a cross-sectional view of the protective component in Example 3; Figure 8 This is a schematic diagram of the protective component in Example 4; Figure 9 This is a schematic diagram of the protective component in Example 5; Figure 10 This is a schematic diagram of the protective component and protrusions in Example 6; Figure 11 This is a schematic diagram of the protective component and groove in Example 6.

[0021] Reference numerals in the attached diagram: 1. Cabinet; 2. Guide rail; 3. Circuit breaker; 4. Wiring hole; 5. Protective component; 51. Column; 511. Annular rib; 512. Plug-in post; 513. Support post; 52. Protective plate; 53. Wiring passage; 531. First wiring passage; 532. Second wiring passage; 54. Semi-column; 541. Protrusion; 542. Groove; 6. Wire; 61. Wire core. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] The present invention will be further explained below with reference to specific embodiments.

[0026] Example 1 like Figures 1-4As shown in the figure, this embodiment provides a protective component for low-voltage switchgear, including a cabinet 1. Multiple rows of guide rails 2 are provided on the back panel of the cabinet 1. Circuit breakers 3 and other electrical components such as contactors and relays are mounted on the guide rails 2. A protective component 5 is detachably installed inside the wiring hole 4 on the circuit breaker 3. The lower part of the protective component 5 is inserted into the wiring hole 4, and the bottom surface of the protective component 5 abuts against the top of the wiring terminal inside the wiring hole 4, thereby completely covering the top surface of the wiring terminal. The protective component 5 is an integrally molded insulating component and has a column 51. The outer wall shape of the column 51 matches the inner wall of the wiring hole 4 with an interference fit, which is mainly achieved by the elastic deformation of the column 51 material. A protective plate 52 is provided at the top of the column 51, extending outward from the top of the column 51, effectively preventing dust, metal debris, water droplets, and other foreign objects from falling directly into the vicinity of the wiring hole 4. A wire passage 53 is provided along the axial direction of the column 51 and the protective plate 52 to allow the wire 6 to pass through and to form an insulating enclosure for the exposed wire core 61 in the wire 6. The inner wall of the wire passage 53 maintains a radial gap of 0.05-0.2 mm with the outer surface of the wire 6 to facilitate the passage of the wire 6 and to form a complete insulating enclosure for the exposed wire core 61, while preventing dust, metal debris, or water droplets from falling into the wiring hole 4. The protective component 5 is made of flame-retardant ABS or polycarbonate, and the overall height of the protective component 5 is at least 10 mm higher than the depth of the wiring hole 4. This height design provides additional longitudinal insulation coverage for the exposed conductor 61, significantly extending the insulation path of its exposed portion and greatly enhancing electrical safety. At least one annular rib 511 is provided on the lower part of the outer wall of the column 51. When the column 51 is inserted into the wiring hole 4, the annular rib 511 is used to increase the frictional resistance with the inner wall of the wiring hole 4, thereby enhancing the interference fit strength.

[0027] Example 2 like Figures 5-6 As shown, the difference between this embodiment and Embodiment 1 is that the column 51 and the protective plate 52 are divided into two independent yet combinable semi-columns 54 along their axial direction. One semi-column 54 has at least two protrusions 541 on its combing surface, while the other semi-column 54 has corresponding grooves 542 on its opposite surface that mate with the protrusions 541. When the two semi-columns 54 are combined, the protrusions 541 are inserted into the corresponding grooves 542, achieving a fixed connection between the two semi-columns 54. This split structure allows the protective component 5 to be installed after the wire 6 has been crimped to the terminal block. Simply close the two semi-columns 54 from both sides of the wire 6, aligning and engaging the protrusions 541 and grooves 542. This allows for rapid covering and positioning of the protective component 5 without disassembling the terminal block. Furthermore, this design fully retains the insulation and containment capabilities of the wire passage 53 for the wire core 61 and the contaminant blocking effect of the protective plate 52 in Embodiment 1.

[0028] Example 3 like Figure 7 As shown, the difference between this embodiment and Embodiment 1 is that the wire passage 53 is composed of a first wire passage 531 and a second wire passage 532; the first wire passage 531 extends along the axial direction of the column 51, and the second wire passage 532 extends along the axial direction of the protective plate 52, and the two are interconnected; a gap of 0.05 mm to 0.2 mm is left between the inner circumferential surface of the second wire passage 532 and the outer surface of the wire 6; the diameter of the second wire passage 532 is smaller than the diameter of the first wire passage 531. When the column 51 is inserted into the wiring hole 4, the second wire passage 532 radially positions the wire 6 in the form of a "flexible clamp" to suppress shaking; at the same time, the first wire passage 531 forms an annular heat dissipation cavity around the wire, and the heat generated during operation can be dissipated along the cavity, thus taking into account both mechanical stability and heat dissipation performance.

[0029] Example 4 like Figure 8 As shown, the difference between this embodiment and Embodiment 1 is that the column 51 and the protective plate 52 are divided into two independent yet combinable semi-columns 54 along their axial direction. One semi-column 54 has at least two protrusions 541 on its combing surface, and the other semi-column 54 has corresponding grooves 542 on its opposite surface that mate with the protrusions 541. When the two semi-columns 54 are joined, the protrusions 541 are inserted into the corresponding grooves 542, achieving a fixed connection between the two semi-columns 54. After the wire 6 is crimped to the terminal, there is no need to disconnect or cut the wire; the two semi-columns 54 can be directly joined from both sides to complete the covering of the protective plate 52 and the column 51 in one go.

[0030] Example 5 like Figure 9 As shown, the difference between this embodiment and Embodiment 1 is that the column 51 includes a plug-in post 512. The height of the plug-in post 512 is less than or equal to the length of the column 51 inserted into the wiring hole 4. The plug-in post 512 has an axially extending wire passage channel 53. The outer wall shape of the plug-in post 512 matches the inner wall of the wiring hole 4 and is interference-fitted. The outer wall of the plug-in post 512 is provided with at least one annular rib 511 to enhance the interference fit strength with the inner wall of the wiring hole 4. A support post 513 is provided at each of the four corners of the bottom end of the plug-in post 512. When the plug-in post 512 is inserted into the wiring hole 4, the support post 513 simultaneously provides auxiliary support and forms a heat dissipation space. After being inserted into place, the four corner support posts 513 abut against the top of the wiring terminal to form an overhead layer, which provides support for the column 51. In addition, the four corner support posts 513 abut against the wiring terminal to form an overhead heat dissipation layer, and the heat dissipation efficiency is improved through the overhead layer.

[0031] Example 6 like Figure 10 , Figure 11As shown, the difference between this embodiment and Embodiment 1 is that the column 51 and the protective plate 52 are divided into two independent and combinable semi-columns 54 along their axial direction. Each semi-column 54 has at least two protrusions 541 on the splicing surface of the insertion post 512, and the other semi-column 54 has corresponding grooves 542 on the opposite surface of the insertion post 512 that mate with the protrusions 541. When the two semi-columns 54 are joined, the protrusions 541 are inserted into the corresponding grooves 542, achieving a fixed connection between the two semi-columns 54. The column 51 and the protective plate 52 are axially divided into two independently operable left and right semi-columns 54. The splicing surface of the insertion post 512 forms a snap-fit ​​with multiple protrusions 541 and corresponding grooves 542. Without disassembling the terminals, the protective component 5 is quickly covered and positioned, while retaining the insulation and surrounding capability of the wire channel 53 for the wire core 61 and the contaminant blocking effect of the protective plate 52 as in Embodiment 1.

[0032] 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 protective component for low-voltage switchgear assemblies, characterized in that, Includes a cabinet (1), with multiple rows of guide rails (2) on the back panel of the cabinet (1), and a circuit breaker (3) and other electrical components installed on the guide rails (2); a protective component (5) is detachably inserted into the wiring hole (4) on the circuit breaker (3), the protective component (5) is an integrally formed insulating component, the protective component (5) has a column (51), the outer wall shape of the column (51) matches the inner wall of the wiring hole (4) and is interference fit; a protective plate (52) is provided at the top of the column (51), the protective plate (52) is provided at the top of the column (51) and extends outward, and a wire passage (53) is provided through the axial direction of the column (51) and the protective plate (52) so that the wire (6) can pass through and form an insulating enclosure for the exposed wire core (61) in the wire (6).

2. A protective component for low-voltage switchgear according to claim 1, characterized in that, The protective part (5) is made of flame-retardant ABS or polycarbonate, and the overall height of the protective part (5) is at least 10 mm higher than the wiring hole (4).

3. A protective component for low-voltage switchgear according to claim 2, characterized in that, At least one annular rib (511) is provided on the lower part of the outer wall of the column (51). When the column (51) is inserted into the wiring hole (4), the annular rib (511) is used to enhance the interference fit strength with the inner wall of the wiring hole (4).

4. A protective component for low-voltage switchgear according to claim 3, characterized in that, The inner wall of the wire passage (53) maintains a gap of 0.05-0.2mm with the outer surface of the wire (6) so that the wire (6) can be inserted.

5. A protective component for low-voltage switchgear according to claim 4, characterized in that, The column (51) and the protective plate (52) are divided into two independent but combinable half-columns (54) along their axial direction; one half-column (54) has at least two protrusions (541) on its combing surface, and the other half-column (54) has corresponding grooves (542) on its opposite surface that cooperate with the protrusions (541); when the two half-columns (54) are combinated, the protrusions (541) are inserted into the corresponding grooves (542) to achieve a fixed connection between the two half-columns (54).

6. A protective component for low-voltage switchgear according to claim 4, characterized in that, The wire passage (53) consists of a first wire passage (531) and a second wire passage (532); the first wire passage (531) runs through the axis of the column (51), and the second wire passage (532) runs through the axis of the protective plate (52), and the two are interconnected; a gap of 0.05 mm to 0.2 mm is left between the inner circumferential surface of the second wire passage (532) and the outer surface of the wire (6); the diameter of the second wire passage (532) is smaller than the diameter of the first wire passage (531).

7. A protective component for low-voltage switchgear according to claim 6, characterized in that, The column (51) and the protective plate (52) are divided into two independent but combinable half-columns (54) along their axial direction; one half-column (54) has at least two protrusions (541) on its combing surface, and the other half-column (54) has corresponding grooves (542) on its opposite surface that cooperate with the protrusions (541); when the two half-columns (54) are combinated, the protrusions (541) are inserted into the corresponding grooves (542) to achieve a fixed connection between the two half-columns (54).

8. A protective component for low-voltage switchgear according to claim 1, characterized in that, The column (51) includes a plug-in post (512), and the plug-in post (512) is axially provided with a wire passage (53). The outer wall shape of the plug-in post (512) matches the inner wall of the wiring hole (4) and is interference-fitted. A support post (513) is provided at each of the four corners of the bottom end of the plug-in post (512). At least one annular rib (511) is provided on the outer wall of the plug-in post (512) to enhance the interference fit strength with the inner wall of the wiring hole (4). When the plug-in post (512) is inserted into the wiring hole (4), the support post (513) simultaneously serves as an auxiliary support and forms a heat dissipation space.

9. A protective component for low-voltage switchgear according to claim 1, characterized in that, The column (51) and the protective plate (52) are divided into two independent but combinable half-columns (54) along their axial direction; the half-column (54) is provided with at least two protrusions (541) on the splicing surface of the plug-in column (512), and the other half-column (54) is provided with corresponding grooves (542) that cooperate with the protrusions (541) on the opposite surface of the plug-in column (512); when the two half-columns (54) are spliced, the protrusions (541) are inserted into the corresponding grooves (542) to achieve a fixed connection between the two half-columns (54).

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