A drawer switch

Abstract

The application relates to the technical field of low-voltage electrical apparatus, in particular to a drawer-type switch. The core of the drawer-type switch provided by the application is that the contact system and the electric connection structure are integrated by adopting the design of "multi-branch parallel" and "one-piece forming". Specifically, the contact body of the static contact and a plurality of first branch rows are one-piece formed, and the second body row of the dynamic busbar and a plurality of second branch rows are one-piece formed; the corresponding first wiring component and the second wiring component also adopt the one-piece formed busbar and the multi-branch row. The heat dissipation spaces are arranged between the branch rows. The structure increases the surface of the current flow path through the multi-branch row structure, improves the current carrying capacity in the alternating current working condition, simultaneously eliminates the contact resistance of the split connection through the one-piece forming, and forms the heat dissipation air duct through the multi-branch parallel shunt, so that the heat dissipation capacity is obviously enhanced, the temperature rise is effectively controlled, the material lap redundancy is reduced, and the copper amount is optimized.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more particularly to a drawer-type switch. Background Technology

[0002] Drawer-type switches, as modular and pluggable low-voltage electrical devices, are widely used in power distribution systems due to their ease of maintenance and quick replacement. The switch mainly consists of two parts: a drawer base and a switch body. The drawer base is a fixed part, installed inside the distribution cabinet, providing power inlet and outlet interfaces. The switch body is a removable part, capable of being inserted into or removed entirely from the drawer base.

[0003] The switch body internally houses a contact system, including a stationary contact and a moving contact. The drawer base is equipped with a first clamp and its corresponding first wiring component, and a second clamp and its corresponding second wiring component. The first and second clamps serve as power supply and load supply clamps, respectively, and the first and second wiring components are also correspondingly divided into power supply and load supply wiring components. When the switch body is inserted into the drawer base, one end of the power supply clamp holds the power supply wiring component, and the other end holds the stationary busbar of the stationary contact. One end of the load supply clamp holds the load supply wiring component, and the other end holds the moving busbar of the moving contact.

[0004] With the switch body inserted into the drawer seat and the moving and stationary contacts closed, a complete main circuit is formed: current flows from the power supply end through the power supply end wiring component → power supply end clamp → stationary contact → moving contact → load end clamp → load end wiring component, and is finally delivered to the load.

[0005] It is evident that drawer-type switches contain multiple mechanical contact interfaces in their current path. Each interface generates contact resistance due to factors such as contact pressure and surface condition. This resistance is converted into Joule heat under load current, which is crucial for controlling the switch's temperature rise performance. To meet increasingly stringent compliance requirements and improve operational reliability, effective temperature rise control is essential. However, existing temperature rise control methods often lead to a significant increase in copper usage and cost. Therefore, optimizing and reducing copper usage while ensuring or even improving heat dissipation performance and strictly controlling temperature rise has become a pressing issue for drawer-type switches. Summary of the Invention

[0006] This application provides a drawer switch to solve the technical problems of existing drawer switches, such as poor heat dissipation or large copper consumption. While having good heat dissipation capabilities, it can save copper consumption and improve safety during use.

[0007] The technical solution of this application is as follows: The drawer-type switch provided in this application includes a switch body and a drawer base. The switch body includes a first housing and at least one set of contact systems. The drawer base includes a base and at least one set of electrical connection structures, with the base located on one side of the switch body and the electrical connection structures fixed to the base.

[0008] The contact system includes a stationary contact and a moving contact. The stationary contact includes an integrally formed contact body and multiple first branch lines, with the contact body located within a first housing. Multiple first branch lines are connected in parallel to the side of the contact body near the base and extend beyond the first housing toward the base. A heat dissipation gap exists between adjacent first branch lines.

[0009] The moving contact includes a moving busbar, which comprises an integrally formed second body busbar and multiple second branch busbars. The second body busbar is located within a first housing. Multiple second branch busbars are connected in parallel to the side of the second body busbar near the base and extend out of the first housing toward the base. There is a heat dissipation gap between adjacent second branch busbars.

[0010] The electrical connection structure includes a first electrical connection structure and a second electrical connection structure. The first electrical connection structure includes multiple first clamps and a first wiring component. The first wiring component includes multiple integrally formed third branch lines, third busbars, and first terminal blocks. The multiple first clamps, multiple third branch lines, and third busbars are disposed in a first mounting groove on the base near the switch body. The multiple third branch lines are arranged side by side on the side of the third busbar near the switch body, with a heat dissipation gap between adjacent third branch lines. The first terminal block is disposed on the other side of the third busbar and extends out of the base. When the switch body is inserted into the drawer base, the multiple first branch lines are electrically connected to the multiple third branch lines one by one through the multiple first clamps.

[0011] The second electrical connection structure includes multiple second clamps and second wiring components. The second wiring components include multiple integrally formed fourth branch lines, fourth busbars, and second wiring terminals. Multiple first clamps, multiple fourth branch lines, and fourth busbars are disposed in a second mounting groove on the base near the switch body. The multiple fourth branch lines are arranged side-by-side on the side of the fourth busbar near the switch body, with a heat dissipation gap between adjacent fourth branch lines. The second wiring terminal is disposed on the other side of the fourth busbar and extends out of the base. When the switch body is inserted into the drawer base, the multiple second branch lines are electrically connected to the multiple fourth branch lines one-to-one through the multiple second clamps.

[0012] Based on the drawer-type switch provided in this application, in terms of safety, the main parts of the first and second wiring components are located inside the base, with a small area exposed outside the base, effectively reducing the risk of electric shock and providing good safety in use. Regarding heat dissipation and temperature rise control, the stationary contact has a first branch line with multiple parallel branches, and the moving busbar has a second branch line with multiple parallel branches, enhancing the heat dissipation capacity of key parts within the first housing. The first and second wiring components respectively employ a third and fourth branch line with multiple parallel branches, effectively improving the heat dissipation effect of the wiring components within the base. The contact body, the first branch line, the moving busbar, the first wiring component, and the second wiring component are all integrally molded. Compared to a separate structure, this reduces contact resistance, thereby reducing the main circuit resistance and heat generation, further contributing to temperature rise control. In terms of economy, the integral molded structure avoids redundant overlaps, reducing the amount of copper used. Especially in AC applications, it can achieve further material savings while ensuring performance. Therefore, the drawer switch of this application has good safety in use and is significantly effective in temperature rise control and economy, which is a significant improvement over the prior art.

[0013] In one possible design, the contact system includes a first group of contact systems, a second group of contact systems, and a third group of contact systems arranged along a first direction. The first group of contact systems is disposed on the side closer to the first housing, the third group of contact systems is disposed on the other side closer to the first housing, and the second group of contact systems is arranged between the first group of contact systems and the third group of contact systems. The amount of copper used in the second group of contact systems is greater than that in the first group of contact systems and the third group of contact systems.

[0014] Based on the drawer switch provided by this embodiment, since the amount of copper used in the second group of contact systems is greater than that in the first group of contact systems and the third group of contact systems, under the same conditions, the resistance of the main circuit in which the second group of contact systems is located is lower than the resistance of the main circuit in which the first group of contact systems is located, and also lower than the resistance of the main circuit in which the third group of contact systems is located. Due to the reduction in resistance, the heat generation is reduced accordingly, which is beneficial to controlling the temperature rise of the second group of contact systems.

[0015] In one possible design, for the same stationary contact, multiple first branches are arranged along a second direction on one side of the contact body, the second direction being perpendicular to the first direction.

[0016] The dimensions of the contact body and the first branch row of the second contact system along the first direction are both larger than the dimensions of the corresponding components in the first and third contact systems. Apart from this, the remaining structural parameters of the stationary contact in the second contact system are consistent with those of the first and third contact systems.

[0017] Based on the drawer switch provided by this embodiment, under the same conditions, the resistance of the main circuit where the second group of contact system is located is lower than the resistance of the main circuit where the first group of contact system is located, and also lower than the resistance of the main circuit where the third group of contact system is located. Due to the reduction in resistance, the heat generation is reduced accordingly, which is beneficial to controlling the temperature rise of the second group of contact system.

[0018] Furthermore, in this embodiment, the size of the stationary contact in the second group of contact systems is increased in the first direction. That is, the surface area of ​​the contact body and the surface area of ​​the multiple first branch rows are larger. Thus, the stationary contact in the second group of contact systems has better heat dissipation capacity than the stationary contacts in the first group of contact systems and the third group of contact systems, which is more conducive to temperature rise control.

[0019] In one possible design, the switch body includes a current transformer. The first housing includes a base and a base plate. A third mounting groove with an opening facing the base is formed on the side of the base near the base plate. The base plate is disposed at the opening of the third mounting groove and is fixedly connected to the base. A current transformer mounting groove is also formed on the end of the third mounting groove near the base plate on the base.

[0020] The moving contact is located in the third mounting slot. The contact piece, flexible connection structure, and second body row of the moving busbar are all located within the third mounting slot. Multiple second branch rows are arranged along a second direction on one side of the second body row, extending along a third direction and protruding from the third mounting slot. Each second branch row includes a connected first part and a second part. The first part extends from the second body row to the base plate, and the length of the portion of the first part outside the third mounting slot matches the axial mounting dimensions of the transformer. The second part of the second branch row extends through the base plate toward the base. The third direction is perpendicular to the second direction.

[0021] Along the second direction, the distance between the first part of the second branch line closest to the base wall panel and the base wall panel is greater than the distance between the second part and the base wall panel, to accommodate the current transformer. The current transformer is sleeved on the outside of the first part and positioned in the current transformer mounting slot.

[0022] Based on the drawer-type switch provided by this embodiment, the structural design of the moving busbar allows the current transformer to be installed in a limited space within the moving busbar with multiple layers of second branch lines in the second direction. This helps to reduce the size of the drawer-type switch in the second direction.

[0023] In one possible design, there are two second branch rows, arranged symmetrically about the second body row along the second direction. The spacing between the first parts of the two second branch rows is smaller than the spacing between the second parts.

[0024] Based on the drawer-type switch provided in this embodiment, the two second branch lines are symmetrical about the second main body line. This ensures that the current of the two second branch lines is naturally and evenly distributed, avoiding current imbalance caused by asymmetrical layout, and ensuring that the temperature rise of each second branch line is consistent, thus avoiding local overheating.

[0025] Based on this, the spacing between the first parts of the two second branch circuits is smaller than the spacing between the second parts. This makes the spacing between the first part and the base wall panel greater than the spacing between the second part and the base wall panel, thus ensuring the proper installation of the current transformer. At the same time, the larger spacing between the second parts of the two second branch circuits provides better heat dissipation.

[0026] In one possible design, the axial dimension of the current transformer is greater than the installation length of the first part. A clearance groove is provided at the end of the current transformer near the second part to allow for clearance from the second part.

[0027] Based on the drawer-type switch provided in this embodiment, a clearance groove is provided at the end of the current transformer near the second part to avoid the second part. This solves the problem that some current transformers cannot be installed because their axial dimension is larger than the installation length of the part of the first part located outside the third mounting groove. When the current transformer is pulled towards the first part, the clearance groove can avoid the second part, so that the bottom surface of the current transformer is on the base wall plate, thereby positioning it in the current transformer mounting groove.

[0028] In one possible design, the base includes a substrate, on the side of the substrate near the switch body, a plurality of first insulating plates are provided, the plurality of first insulating plates are arranged in three rows and N columns, and 2M mounting slots are formed on one side of the substrate in a matrix arrangement of two rows and M columns, where N is 3, 4 or 5, and M is equal to N-1.

[0029] In this configuration, the first row of M mounting slots are all first mounting slots, used for installing the first electrical connection structure. The second row of M mounting slots are all second mounting slots, used for installing the second electrical connection structure. The first and second mounting slots located in the same column are used to install the first and second electrical connection structures of the same main circuit.

[0030] On the side of the substrate away from the switch body, N evenly spaced isolation portions are sequentially arranged along a first direction, namely, a first isolation portion, a second isolation portion, ..., an Nth isolation portion, and the width of each of the N isolation portions is greater than the width of the corresponding first insulating plate arranged along the row direction. Along the first direction, the N isolation portions extend relative to the corresponding first insulating plate in a direction away from the central axis of the base.

[0031] Along a first direction, a first opening is formed between two adjacent isolation portions, through which a first terminal block or a second terminal block passes. Along a third direction, a first through hole is provided on the substrate, connecting the mounting groove and the first opening.

[0032] Among them, the first direction is parallel to the row direction, and the third direction, the row direction, and the column direction are perpendicular to each other.

[0033] Based on the drawer-type switch provided in this embodiment, the width of the isolating portion is greater than the width of the corresponding first insulating plates arranged along the row direction. Along the first direction, each isolating portion extends relative to the corresponding first insulating plate in a direction away from the central axis of the base. In this way, by widening the width of the isolating portion, the creepage distance along the insulating surface between the first terminal blocks of different phases and between the second terminal blocks of different phases is increased, thereby helping to improve the insulation class of the drawer-type switch and prevent phase-to-phase short circuits.

[0034] In one possible design, along a first direction, the first mounting slot and / or the second mounting slot in the first column of mounting slots are provided with a first expansion slot on the sidewall away from the adjacent column of mounting slots. Along a third direction, the first expansion slot communicates with the first through hole corresponding to the respective mounting slot, and the bottom of the first expansion slot is on the same plane as the surface of the first isolation portion near the adjacent isolation portion.

[0035] And / or, the first mounting slot and / or the second mounting slot in the Mth column of mounting slots are provided with a second expansion slot on the side wall away from the adjacent column of mounting slots. Along the third direction, the second expansion slot communicates with the first through hole corresponding to the corresponding mounting slot, and the bottom of the second expansion slot is on the same plane as the surface of the Mth isolation part near the adjacent isolation part.

[0036] Based on the drawer-type switch provided in this embodiment, by providing a first expansion slot on the side wall of the first column mounting slot away from the adjacent column mounting slot, and providing a second expansion slot on the side wall of the Mth column mounting slot away from the adjacent column mounting slot, the influence of the isolation part on the assembly of the first wiring component and the second wiring component can be avoided, thereby helping to reduce the size of the drawer seat in the first direction.

[0037] In one possible design, the first wiring component includes a first outgoing wire structure and a second outgoing wire structure.

[0038] The first type of outgoing cable structure is located at the first mounting slot of the first row of mounting slots, with the wiring portion of the first terminal block extending out from the first through hole corresponding to the mounting slot. Along the first direction, the size of the wiring portion of the first terminal block is larger than that of the third busbar, and it extends away from the central axis of the base relative to the third busbar. This increases the spacing between the busbars of different poles, thereby increasing the heat dissipation space.

[0039] The second type of cable exit structure is located at the first mounting slot of the Mth column mounting slot. In the second type of cable exit structure, the wiring portion of the first terminal block extends out of the first through hole corresponding to the mounting slot. Along the first direction, the size of the wiring portion of the first terminal block is larger than the size of the third busbar, and it extends relative to the third busbar in a direction away from the central axis of the base.

[0040] Based on the drawer-type switch provided by this embodiment, when the first terminal block is connected to the user connection terminal block, the contact area between the two increases, thereby helping to reduce the resistance and current density at that location, and thus controlling the temperature rise. Furthermore, the increased wiring area of ​​the first terminal block allows for the installation of larger diameter wiring bolts or a greater number of bolts to meet higher current rating connection requirements and ensure sufficient contact pressure.

[0041] Furthermore, in this embodiment, the wiring portions of the first terminal blocks in both the first and Mth mounting slots extend away from the central axis of the base relative to their respective third busbars. This increases the phase spacing between adjacent first terminal blocks, thereby reducing the probability of phase-to-phase short circuits and improving the operational reliability of the drawer switch.

[0042] In one possible design, the structure of the second wiring component located at the second mounting slot of the first column mounting slot is the same as the first outgoing wiring structure. The structure of the second wiring component located at the second mounting slot of the Mth column mounting slot is the same as the second outgoing wiring structure.

[0043] Based on the drawer-type switch provided in this embodiment, the structure of the second wiring component is the same as that of the first wiring component, and its beneficial effects are the same as those of the first wiring component, which will not be repeated here. Attached Figure Description

[0044] Figure 1 This is a schematic diagram illustrating the interaction between the contact system and the electrical connection structure in a drawer-type switch, as provided in the prior art.

[0045] Figure 2 A schematic diagram of the contact system and electrical connection structure in another type of drawer switch provided by the prior art.

[0046] Figure 3 This is a schematic diagram of a drawer-type switch provided in an embodiment of this application.

[0047] Figure 4 The diagram shown is a structural schematic of a switch body.

[0048] Figure 5 This is a schematic diagram of the contact system and arc extinguishing system in the switch body.

[0049] Figure 6This is a structural diagram of the main circuit in a three-pole drawer switch provided in an embodiment of this application.

[0050] Figure 7 for Figure 5 Exploded view.

[0051] Figure 8 for Figure 7 The diagram shows the structure after removing one current transformer.

[0052] Figure 9 This is a schematic diagram showing the state of a drawer-type switch after the first step in the assembly process of the current transformer.

[0053] Figure 10 This is a schematic diagram showing the state of a drawer-type switch after the second step in the assembly process of the current transformer.

[0054] Figure 11 This is a schematic diagram showing the state of a drawer-type switch after the third step in the assembly process of the current transformer.

[0055] Figure 12 This is a schematic diagram showing the state of a drawer-type switch after the fourth step in the assembly process of the current transformer.

[0056] Figure 13 This is a schematic diagram of the drawer-type switch after the current transformer has been assembled.

[0057] Figure 14 This is a three-dimensional structural diagram of a base provided in an embodiment of this application.

[0058] Figure 15 for Figure 14 The cross-sectional view of the base shown.

[0059] Figure 16 This is a schematic diagram of the assembly structure of the base and the electrical connection structure.

[0060] The reference numerals in the first type of prior art are as follows: 1A, stationary contact; 1A2, contact body; 1A3, stationary busbar; 2A, moving contact; 2A1, moving busbar; 2A11, second busbar; 2A12, shunt busbar; 2A3, contact piece; 3A, first electrical connection structure; 3A1, first wiring component; 3A11, third busbar; 3A12, first terminal block; 3A2, first clamp; 4A, second electrical connection structure; 4A1, second wiring component; 4A11, fourth busbar; 4A12, second terminal block; 4A2, second clamp; The reference numerals in the second prior art are: 1B, stationary busbar; 2B, moving busbar; 3B, first wiring component; 4B, second wiring component; The reference numerals in this application are: 1. Switch body; 11. First housing; 111. Base; 1112. Current transformer mounting slot; 1113. Wall panel; 112. Base plate; 12. Contact system; 121. First group of contact system; 122. Second group of contact system; 123. Third group of contact system; 124. Stationary contact; 1241. Contact body; 1242. First branch busbar; 125. Moving contact; 1251. Moving busbar; 12511. Second body busbar; 12512. Second branch busbar; 1251A. First part; 1251B. Second part; 1253. Flexible connection structure; 2. Drawer base; 21. Base; 211. Substrate; 2111. First insulating plate; 2112. First mounting groove; 2113. Second mounting groove; 2114. Isolation part; 2115. First through hole; 2116. First expansion groove; 2117. Second expansion groove; 22. First electrical connection structure; 221. First clamp; 222. First wiring component; 2221. Third branch line; 2222. Third busbar; 2223. First terminal block; 23. Second electrical connection structure; 231. Second clamp; 232. Second wiring component; 2321. Fourth branch line; 2322. Fourth busbar; 2323. Second terminal block; 23. Frame; 3. Current transformer; 31. Clearance slot. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion.

[0063] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0065] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0066] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0067] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by spacers, screws, bolts, or other spacers. A physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection. A physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0068] The following section provides a detailed description of this application, starting from its background.

[0069] A drawer-type switch includes a matching drawer base and a switch body. The drawer base is a fixed part, fixed inside the distribution cabinet, providing power inlet and outlet interfaces. The switch body is a removable part, capable of being inserted into or removed from the drawer base. The switch body includes at least one set of contact systems. The drawer base includes at least one set of electrical connection structures.

[0070] Figure 1 This is a schematic diagram illustrating the interaction between the contact system and electrical connection structure in a drawer-type switch, as provided in the prior art. Please refer to it. Figure 1The contact system includes a stationary contact 1A and a moving contact 2A. The stationary contact 1A includes a stationary contact 1A1, a contact body 1A2, and a stationary busbar 1A3. The stationary contact 1A1 and the stationary busbar 1A3 are located on opposite sides of the contact body 1A2. The stationary busbar 1A3 has a U-shaped structure. The stationary busbar 1A3 and the contact body 1A2 are separately installed and fixedly connected. The connection between the U-shaped stationary busbar 1A3 and the contact body 1A2 is at the bottom of the U-shaped structure.

[0071] The moving contact 2A includes a moving busbar 2A1, a flexible connection structure, and a contact piece 2A3. The moving busbar 2A1 includes a second busbar 2A11 and a U-shaped branch busbar 2A12. The second busbar 2A11 and the branch busbar 2A12 are independently arranged, and the connection between the branch busbar 2A12 and the second busbar 2A11 is at the bottom of the branch busbar 2A12.

[0072] The electrical connection structure includes a first electrical connection structure 3A and a second electrical connection structure 4A. The first electrical connection structure 3A is used for electrical connection with the stationary contact 1A. The first electrical connection structure 3A includes a first wiring component 3A1 and two first clamps 3A2. The first wiring component 3A1 includes a separately configured third busbar 3A11 and a first terminal block 3A12. One side of the third busbar 3A11 has two first conductive walls, and the first terminal block 3A12 is disposed on the other side of the third busbar 3A11. The two are fixedly connected by threaded fasteners. One end of each of the two first clamps 3A2 clamps one of the two first conductive walls.

[0073] The second electrical connection structure 4A is used for electrical connection with the moving contact 2A. The second electrical connection structure 4A includes a second wiring component 4A1 and two second clamps 4A2. The second wiring component 4A1 includes a separately configured fourth busbar 4A11 and a second terminal block 4A12. One side of the fourth busbar 4A11 has two second conductive walls, and the second terminal block 4A12 is disposed on the other side of the fourth busbar 4A11. The two are fixedly connected by threaded fasteners. One end of each of the two second clamps 4A2 clamps one of the two second conductive walls.

[0074] When the switch body is inserted into the drawer base, the other ends of the two first clamps 3A2 clamp the stationary busbar 1A3, and the other ends of the two second clamps 4A2 clamp the shunt 2A12 of the moving busbar 2A1. When the moving contact 2A contacts the stationary contact 1A, a complete main circuit is formed in the drawer switch: the current flows sequentially through the first terminal block 3A12, the third busbar 3A11, the first clamp 3A2, the stationary busbar 1A3, the contact body 1A2, the contact piece 2A3, the flexible connection structure, the second busbar 2A11, the U-shaped shunt 2A12, the second clamp 4A2, and the fourth busbar 4A11 to reach the second terminal block 4A12. Current can also flow in from the second terminal block 4A12 and flow in the opposite direction to reach the first terminal block 3A12.

[0075] As can be seen from the above structure, Figure 1 The drawer-type switch with the structure shown has the problems of a long current path, many contact points, and high contact resistance in its main circuit. Furthermore, in this structure, the stationary busbar 1A3 in the stationary contact 1A is separately from the contact body 1A2; the second busbar 2A11 and the U-shaped shunt busbar 2A12 in the moving busbar 2A1 are separately; the third busbar 3A11 and the first terminal block 3A12 in the first wiring component 3A1 are separately; and the fourth busbar 4A11 and the second terminal block 4A12 in the second wiring component 4A1 are also separately. When the two separately configured conductive components are connected, there is a large overlap area between them, resulting in a high copper consumption.

[0076] To address the aforementioned problems, existing technologies have emerged... Figure 2 The optimized structure shown is as follows. Its core improvement is that the stationary busbar 1B, moving busbar 2B, and the corresponding first wiring component 3B and second wiring component 4B all adopt a rectangular structure, and each component is changed from a separate piece to a single integrated molding. This reduces contact resistance and the amount of copper used, but the heat dissipation performance of the rectangular solid structure is poor, which is not conducive to the overall temperature rise control of the drawer-type switch.

[0077] Based on this, please refer to Figure 3 , Figure 3 This is a schematic diagram of a drawer-type switch provided in an embodiment of this application. Figure 3 As shown, the drawer-type switch provided in this application includes a switch body 1 and a drawer base 2. The switch body 1 includes a first housing 11 and at least one set of contact systems 12. The drawer base 2 includes a base 21 and at least one set of electrical connection structures. The base 21 is located on one side of the switch body 1, and the electrical connection structures are fixed to the base 21.

[0078] The contact system 12 includes a stationary contact 124 and a moving contact 125. The stationary contact 124 includes an integrally formed contact body 1241 and a plurality of first branch lines 1242. The contact body 1241 is located inside the first housing 11. The plurality of first branch lines 1242 are connected in parallel to the side of the contact body 1241 near the base 21 and extend out of the first housing 11 toward the base 21. There is a heat dissipation gap between two adjacent first branch lines 1242.

[0079] The moving contact 125 includes a moving busbar 1251, which comprises an integrally formed second body busbar 12511 and a plurality of second branch busbars 12512. The second body busbar 12511 is located within the first housing 11. The plurality of second branch busbars 12512 are connected in parallel to the side of the second body busbar 12511 near the base 21 and extend out of the first housing 11 toward the base 21. There is a heat dissipation gap between adjacent second branch busbars 12512.

[0080] The electrical connection structure includes a first electrical connection structure 22 and a second electrical connection structure 23. The first electrical connection structure 22 includes multiple first clamps 221 and a first wiring component 222. The first wiring component 222 includes multiple integrally formed third branch lines 2221, third busbars 2222, and first wiring pins 2223. The multiple first clamps 221, multiple third branch lines 2221, and third busbars 2222 are disposed in the first mounting groove 2112 on the side of the base 21 near the switch body 1. The multiple third branch lines 2221 are arranged side by side on the side of the third busbar 2222 near the switch body 1, with a heat dissipation gap between adjacent third branch lines 2221. The first wiring pins 2223 are disposed on the other side of the third busbar 2222 and extend out of the base 21. When the switch body 1 is inserted into the drawer seat 2, the multiple first branch lines 1242 are electrically connected to the multiple third branch lines 2221 one by one through the multiple first clamps 221.

[0081] The second electrical connection structure 23 includes multiple second clamps 231 and a second wiring component 232. The second wiring component 232 includes multiple integrally formed fourth branch lines 2321, fourth busbars 2322, and second wiring pins 2323. The multiple second clamps 231, multiple fourth branch lines 2321, and fourth busbars 2322 are disposed in the second mounting groove 2113 on the side of the base 21 near the switch body 1. The multiple fourth branch lines 2321 are arranged side by side on the side of the fourth busbar 2322 near the switch body 1, with a heat dissipation gap between adjacent fourth branch lines 2321. The second wiring pin 2323 is disposed on the other side of the fourth busbar 2322 and extends out of the base 21. When the switch body 1 is inserted into the drawer seat 2, the multiple second branch lines 12512 are electrically connected to the multiple fourth branch lines 2321 one by one through the multiple second clamps 231.

[0082] For details, please refer to Figure 1 The core invention objectives of this application are to ensure safety during use, control temperature rise, and save copper usage for the drawer-type switch. The following is a detailed description of these aspects.

[0083] I. Good safety in use

[0084] Please refer to Figure 3 The first wiring component 222 of this application includes multiple integrally formed third branch lines 2221, third busbars 2222, and a first terminal block 2223. During installation, the first wiring component 222 is installed from the side of the base 21 near the switch body 1. The multiple third branch lines 2221 and third busbars 2222 of the first wiring component 222 are all located in the first mounting groove inside the base 21, with only the first terminal block 2223 of the first wiring component 222 protruding from the base for user wiring.

[0085] Similarly, the second wiring component 232 of this application includes multiple integrally formed fourth branch lines 2321, fourth busbars 2322, and second terminal blocks 2323. During installation, the second wiring component 232 is also installed from the side of the base 21 near the switch body 1. The multiple fourth branch lines 2321 and fourth busbars 2322 of the second wiring component 232 are all located in the second mounting groove inside the base 21, with only the second terminal block 2323 of the second wiring component 232 protruding from the base for user wiring.

[0086] Compared to the first prior art, in the first prior art, both the first wiring component 3A1 and the second wiring component 4A1 adopt a split structure. This makes it inconvenient to install the first wiring component 3A1 and the second wiring component 4A11 from the inside of the base; currently, they are installed from the outside of the base. After installation, the overlapping areas of the first terminal block 3A12, the third busbar 3A11, and the first terminal block 3A12 are all located outside the base, as are the overlapping areas of the second terminal block 4A12, the fourth busbar 4A11, and the second terminal block 4A12. This results in a larger area of ​​the conductors of the first wiring component 3A1 and the second wiring component 4A1 exposed to the base.

[0087] As can be seen from the above, in this application, the main parts of the first wiring component 222 and the second wiring component 232 are located inside the base, and the exposed parts outside the base have a much smaller exposed area compared with the first prior art. Therefore, it can effectively reduce the risk of electric shock from the drawer switch and make the drawer switch have good safety in use.

[0088] II. Optimize temperature rise control performance Regarding temperature rise, controlling the temperature rise of drawer switches involves two aspects: first, reducing the heat generated by the drawer switch itself, and second, improving the heat dissipation performance of the internal conductive components of the drawer switch.

[0089] From the perspective of reducing heat generation, in this application, the contact body 1241 of the stationary contact 124 and the multiple first branch lines 1242 are integrally formed. The contact body 1241 and the multiple first branch lines 1242 are continuous metal conductors, and there is no contact resistance between them. Thus, compared with the structure in the first prior art where the contact body and the stationary busbar are separately set and fixedly connected, the integrally formed structure avoids local heating caused by poor contact in the separate connection structure, and significantly reduces the heat generation of the main circuit.

[0090] Similarly, in this application, the first moving busbar 1251, the first wiring component 222, and the second wiring component 232 are all integrally formed structures, which are all beneficial to reducing the heat generation of the main circuit compared with the corresponding components in the first prior art.

[0091] From the perspective of improving heat dissipation performance, in this application, the stationary contact 124 includes a contact body 1241 and a plurality of first branch lines 1242. The plurality of first branch lines 1242 are connected in parallel on the side of the contact body 1241 near the base 21, and there is a heat dissipation gap between two adjacent first branch lines 1242.

[0092] Thus, when the drawer switch is a DC switch, current flows from the multiple first branch lines 1242 to the contact body 1241, or from the contact body 1241 to the multiple first branch lines 1242, with the multiple first branch lines 1242 acting as parallel current shunting. Consequently, along the current flow path, each first branch line 1242 has multiple surfaces exposed to the air, and heat dissipation channels are formed between adjacent first branch lines 1242. This results in better heat dissipation compared to the second type of solid rectangular static contact.

[0093] Similarly, in this application, the moving busbar 1251, the first wiring component 222, and the second wiring component 232 all adopt a multi-branch busbar structure design similar to the stationary contact 124. Compared with the corresponding structure in the second prior art, it has more heat dissipation surfaces, a larger heat dissipation area, and can form heat dissipation channels, thus having stronger heat dissipation capabilities.

[0094] Especially when the drawer switch is an AC switch, the multiple first branch bars 1242, multiple second branch bars 12512, multiple third branch bars 2221, and multiple fourth branch bars 2321 serve the same heat dissipation function as DC fixed switches. The difference is that AC current exhibits a skin effect; the design of multiple branch bars effectively increases the surface area of ​​corresponding parts, thereby reducing the AC impedance of the main circuit. Thus, on the one hand, with the same amount of copper, the main circuit has a higher current-carrying capacity. On the other hand, the reduced AC impedance helps reduce heat generation in the main circuit, thus facilitating temperature rise control of the drawer switch.

[0095] III. Reduce copper consumption In terms of copper usage, the contact body 1241 and multiple first branch lines 1242 of the stationary contact 124 are integrally formed. The multiple first branch lines 1242 extend directly from the contact body 1241 to one side, with no redundant overlapping parts between them. Compared with the first prior art, in which the contact body and the U-shaped stationary busbar are separately set and fixedly connected, the integrally formed stationary contact 124 can reduce the amount of copper used.

[0096] In the second prior art, the stationary contact and the moving busbar are both integral solid structures, resulting in less copper usage compared to the first prior art. However, due to the smaller overall heat dissipation area of ​​the stationary contact and the moving busbar in the second prior art, their thickness is relatively large to meet temperature rise control requirements. Compared to the second structure, the drawer-type switch provided in this application can save copper in some cases. The main reason is that the stationary contact 124, the moving busbar 1251, the first wiring component 222, and the second wiring component 232 in this application all adopt a multi-branch parallel design, resulting in a large heat dissipation surface area, good airflow effect, and stronger self-heating capacity. Especially for AC switches, the multi-branch parallel design can effectively reduce AC impedance, thereby reducing heat generation and allowing less copper to be used under the same current carrying capacity. Moreover, as the operating current increases, the advantages of this application in terms of heat dissipation and impedance become more prominent, thus the copper-saving effect is more obvious in high-current applications.

[0097] In summary, compared with existing technologies, the drawer-type switch provided in this application offers several advantages in terms of safety. The main parts of the first and second wiring components are located within the base, with a small area exposed outside the base, effectively reducing the risk of electric shock and providing excellent safety. Regarding heat dissipation and temperature rise control, the stationary contact 124 has a first branch line 1242 with multiple parallel branches, and the moving busbar 1251 has a second branch line 12512 with multiple parallel branches, enhancing the heat dissipation capacity of key components within the first housing 11. The first wiring component 222 and the second wiring component 232 respectively employ a third branch line 2221 and a fourth branch line 2321 with multiple parallel branches, effectively improving the heat dissipation of the wiring components within the base 21. The contact body 1241, the first branch line 1242, the moving busbar 1251, the first wiring component 222, and the second wiring component 232 are all integrally molded. Compared to a separate structure, this reduces contact resistance, thereby lowering the main circuit resistance and heat generation, further contributing to temperature rise control. In terms of economy, the one-piece molded structure avoids redundant overlaps and reduces copper usage. Especially in AC applications, it can achieve further material savings while ensuring performance. Therefore, the drawer-type switch of this application has significant advantages in safety, temperature rise control, and economy, representing a significant improvement over existing technologies.

[0098] It should be noted that: in Figure 3 In the structure shown, the number of the first branch row 1242, the second branch row 12512, the third branch row 2221, and the fourth branch row 2321 are all two. In other embodiments of this application, the number of the first branch row 1242, the second branch row 12512, the third branch row 2221, and the fourth branch row 2321 is not limited to two, and can be more than two.

[0099] In addition, Figure 3In the structure shown, the two first branch rows 1242, the two second branch rows 12512, the two third branch rows 2221, and the two fourth branch rows 2321 are all arranged vertically, thus having a vertical spacing. In other embodiments of this application, the plurality of first branch rows 1242, the plurality of second branch rows 12512, the plurality of third branch rows 2221, and the plurality of fourth branch rows 2321 can be arranged horizontally, thus having a horizontal spacing.

[0100] Furthermore, the first branch row 1242, the second branch row 12512, the third branch row 2221, and the fourth branch row 2321 can be flat or have a certain curvature. This application does not impose any restrictions on this.

[0101] Furthermore, the drawer switch provided in this application can be a two-pole drawer switch, a three-pole drawer switch, or a four-pole drawer switch.

[0102] It should also be noted that the drawer-type switch in this application can be a drawer-type circuit breaker or a drawer-type disconnector; it can be an AC switch or a DC switch.

[0103] Figure 6 This application provides a structural diagram of the main circuit in a three-pole drawer switch, which is shown in the embodiment of the present application. Please refer to the diagram for details. Figure 3 and Figure 6 In some embodiments of this application, when the drawer switch is a three-pole drawer switch or a four-pole drawer switch, multiple sets of contact systems 12 are provided in the drawer switch. The multiple sets of contact systems 12 are generally arranged side by side. The contact system 12 located in the middle part is relatively difficult to dissipate heat, and its temperature rise is higher than that of the contact systems 12 on both sides.

[0104] Based on this, in one embodiment of this application, the contact system 12 includes a first group of contact systems 121, a second group of contact systems 122 and a third group of contact systems 123 arranged along a first direction. The first group of contact systems 121 is disposed on the side close to the first housing 11, the third group of contact systems 123 is disposed on the other side close to the first housing 11, and the second group of contact systems 122 is arranged between the first group of contact systems 121 and the third group of contact systems 122. The amount of copper used in the second group of contact systems 122 is greater than that in the first group of contact systems 121 and the third group of contact systems 123.

[0105] Therefore, based on the drawer switch provided in this embodiment, since the amount of copper used in the second group of contact system 122 is greater than that in the first group of contact system 121 and the third group of contact system 123, under the same conditions, the resistance of the main circuit in which the second group of contact system 122 is located is lower than the resistance of the main circuit in which the first group of contact system 121 is located, and also lower than the resistance of the main circuit in which the third group of contact system 123 is located. Due to the reduction in resistance, the heat generation is reduced accordingly, which is beneficial to controlling the temperature rise of the second group of contact system 122.

[0106] It should be noted that, Figure 6 The diagram shown is a structural diagram of the main circuit in a three-pole drawer switch. The contact systems 12 on both sides of the diagram can be regarded as the first group of contact systems 121 and the third group of contact systems 123, respectively, and the contact system 12 in the middle can be regarded as the second group of contact systems 122.

[0107] In other embodiments of this application, the drawer switch can be a four-pole drawer switch, which includes four sets of contact systems 12 arranged side by side. In this case, the two middle sets of contact systems 12 can be regarded as the second set of contact systems 122.

[0108] Please continue to refer to this. Figure 3 and Figure 6 In some embodiments of this application, for the same stationary contact 124, a plurality of first branch rows 1242 are arranged along a second direction on one side of the contact body 1241, and the second direction is perpendicular to the first direction.

[0109] The dimensions of the contact body 1241 and the first branch row 1242 of the second contact system 122 along the first direction are both larger than the dimensions of the corresponding components in the first contact system 121 and the third contact system 123. Apart from this, the remaining structural parameters of the stationary contact 124 in the second contact system 122 are consistent with those of the first contact system 121 and the third contact system 123.

[0110] Specifically, this embodiment increases the dimension of the stationary contact 124 in the first direction of the second contact system 122. The remaining structural parameters of the stationary contact 124 in the second contact system 122 are the same as those of the first contact system 121 and the third contact system 123. This means that the amount of copper used in the stationary contact 124 of the second contact system 122 is increased. Under the same conditions, the resistance of the main circuit containing the second contact system 122 is lower than that of the main circuit containing the first contact system 121 and also lower than that of the main circuit containing the third contact system 123. Due to the reduced resistance, the heat generation is also reduced, which helps to control the temperature rise of the second contact system 122.

[0111] Furthermore, in this application, the stationary contact 124 includes an integrally formed contact body 1241 and a plurality of first branch rows 1242. The plurality of first branch rows 1242 are connected in parallel on the side of the contact body 1241 near the base 21, and there is a heat dissipation gap between adjacent first branch rows 1242. In this embodiment, the size of the stationary contact 124 in the second group of contact systems 122 is increased in the first direction. That is, the surface area of ​​the contact body 1241 and the surface area of ​​the plurality of first branch rows 1242 are larger. Thus, the stationary contact 124 in the second group of contact systems 122 has better heat dissipation capacity than the stationary contact 124 in the first group of contact systems 121 and the third group of contact systems 123, and therefore, it is more conducive to temperature rise control.

[0112] Figure 7 for Figure 5 Explosion diagram, Figure 8 for Figure 7 The diagram shows the structure after removing one current transformer. Please refer to... Figure 3 , Figure 5 , Figure 7 and Figure 8 In one embodiment of this application, the switch body 1 includes a current transformer 3. The first housing 11 includes a base 111 and a bottom plate 112. A third mounting groove with an opening facing the base 21 is formed on the side of the base 111 near the base 21. The bottom plate 112 is disposed at the opening of the third mounting groove and is fixedly connected to the base 111. A current transformer mounting groove 1112 is also formed on the end of the base 111 near the bottom plate 112 of the third mounting groove.

[0113] The moving contact 125 is disposed in the third mounting slot. The contact piece of the moving contact 125, the flexible connection structure 1253, and the second body row 12511 of the moving busbar 1251 are all located within the third mounting slot. Multiple second branch rows 12512 are arranged along a second direction on one side of the second body row 12511, extending along a third direction and protruding from the third mounting slot. Each second branch row 12512 includes a first portion 1251A and a second portion 1251B connected together. The first portion 1251A extends from the second body row 12511 to the base plate 112, and the length of the portion of the first portion 1251A outside the third mounting slot matches the axial mounting dimensions of the current transformer 3. The second portion 1251B of the second branch row 12512 extends through the base plate 112 toward the base 21. The third direction is perpendicular to the second direction.

[0114] Along the second direction, the distance between the first part 1251A of the second branch 12512 near the base wall panel 1113 and the base wall panel 1113 is greater than the distance between the second part 1251B and the base wall panel 1113, to accommodate the current transformer 3. The current transformer 3 is sleeved on the outside of the first part 1251A and positioned in the current transformer mounting slot 1112.

[0115] Specifically, the current transformer 3 in this embodiment can be a current transformer. It uses the principle of electromagnetic induction to convert the large current flowing through the moving busbar 1251 into a standard, easily processed small current or voltage signal. The smaller current or voltage signal can be used for overload and short circuit protection, current display and remote monitoring, etc.

[0116] Please combine Figure 3 , Figure 7 and Figure 8 In this application, since the multiple second branch lines 12512 of the moving busbar 1251 are arranged in the second direction, they occupy a lot of space in the second direction. In some cases, this will cause the distance between the moving busbar 1251 and the base wall plate 1113 to be too small, making it impossible to install the current transformer 3.

[0117] The connection point of the current transformer 3 on the moving busbar 1251 is the first part 1251A of the moving busbar 1251. This embodiment increases the distance between the first part 1251A and the base wall plate 1113 so that the current transformer 3 can be connected to the first part 1251A of the moving busbar 1251.

[0118] For details, please refer to Figures 9 to 13 , Figure 9 This is a schematic diagram showing the state of a drawer-type switch after the first step in the current transformer assembly process. Figure 10 This is a schematic diagram showing the state of a drawer-type switch after the second step in the current transformer assembly process. Figure 11 This is a schematic diagram showing the state of a drawer-type switch after the third step in the current transformer assembly process. Figure 12 This is a schematic diagram showing the state of the drawer-type switch after the fourth step in the current transformer assembly process. Figure 13 This is a schematic diagram of the drawer-type switch after the current transformer has been assembled.

[0119] Please combine Figure 3 , Figure 7 , Figure 8 and Figure 9 In this embodiment, the second portion 1251B of the second branch 12512 extends out of the base plate 112 toward the base 21, and therefore, the second portion 1251B is located outside the third mounting slot. The current transformer 3 can be directly fitted onto the second portion 1251B without being constrained by the base wall plate 1113.

[0120] Please combine Figures 7 to 10 In this embodiment, the length of the portion of the first part 1251A outside the third mounting slot can match the axial mounting dimensions of the current transformer 3. Therefore, in the second step, the current transformer 3 can be pushed from the second part 1251B to the first part 1251A.

[0121] Please combine Figures 7 to 11 When the current transformer 3 is pushed from the second part 1251B to the first part 1251A, the current transformer 3 can be pulled toward the first part 1251A. After being pulled, the bottom surface of the current transformer 3 is located on the base wall plate 1113.

[0122] Please combine Figures 7 to 12 Since the distance between the first part 1251A of the second branch 12512 near the base wall plate 1113 and the base wall plate 1113 is greater than the distance between the second part 1251B and the base wall plate 1113, it can accommodate the current transformer 3. Therefore, when the bottom surface of the current transformer 3 is located on the base wall plate 1113, the current transformer 3 can be pushed into the current transformer mounting slot 1112 at the end of the third mounting slot.

[0123] Please combine Figures 7 to 13 Once the current transformer 3 is positioned in the current transformer mounting slot 1112, the base plate 112 with the stationary contact 124 installed can be fixed to the base 111, thereby enclosing the main conductive components in the first housing 11.

[0124] Therefore, based on the drawer-type switch provided by this embodiment, the structural design of the moving busbar 1251 enables the current transformer 3 to be installed in a limited space in the moving busbar 1251 with multiple layers of second branch busbars 12512 in the second direction. This helps to reduce the size of the drawer-type switch in the second direction.

[0125] It should be noted that in some embodiments of this application, only the shape of the first portion 1251A of the second branch line 12512 near the base wall plate 1113 can be changed, so that the first portion 1251A is offset relative to the second portion 1251B in a direction away from the base wall plate 1113, so as to create a gap between the second branch line 12512 near the base wall plate 1113 and the base wall plate 1113 that is sufficient to accommodate the current transformer 3.

[0126] In some other embodiments of this application, the shape of the first portion 1251A of a plurality of second branch rows 12512 can be changed so that any two first portions 1251A of the second branch rows 12512 have substantially the same spacing.

[0127] Please continue to refer to this. Figures 7 to 13 In some embodiments of this application, there are two second branch rows 12512, which are symmetrical about the second body row 12511 along the second direction. The spacing between the first portions 1251A of the two second branch rows 12512 is smaller than the spacing between the second portions 1251B.

[0128] Specifically, in this embodiment, there are two second branch lines 12512, which are symmetrical about the second main body line 12511 along the second direction. This ensures that the current of the two second branch lines 12512 is naturally and evenly distributed, avoids current bias caused by asymmetrical layout, ensures that the temperature rise of each second branch line is consistent, and avoids local overheating.

[0129] Based on this, the spacing between the first portions 1251A of the two second branch lines 12512 is smaller than the spacing between the second portions 1251B. This makes the spacing between the first portion 1251A and the base wall plate 1113 greater than the spacing between the second portion 1251B and the base wall plate 1113, thus ensuring the proper installation of the current transformer 3. Simultaneously, the larger spacing between the second portions 1251B of the two second branch lines 12512 provides better heat dissipation performance.

[0130] It should be noted that in some other embodiments of this application, when there are multiple second branch lines 12512, the multiple second branch lines 12512 can also be symmetrically arranged about the main body in the second direction, and the distance between the first part 1251A of two adjacent second branch lines 12512 is smaller than the distance between the second part 1251B. This allows the distance between the first part 1251A near the base wall plate 1113 and the base wall plate 1113 to be greater than the distance between the second part 1251B and the base wall plate 1113, thereby ensuring the normal installation of the current transformer 3.

[0131] Please continue to refer to this. Figures 7 to 13 In some embodiments of this application, the axial dimension of the current transformer 3 is greater than the installation length of the portion of the first part 1251A located outside the third mounting groove. A clearance groove 31 for avoiding the second part 1251B is provided at one end of the current transformer 3 near the second part 1251B.

[0132] Specifically, in some cases, the axial dimension of the current transformer 3 is greater than the installation length of the portion of the first part 1251A located outside the third mounting groove. Therefore, in the second step of installing the current transformer 3, after pushing the current transformer 3 from the second part 1251B towards the first part 1251A, a portion of the current transformer 3 will still be fitted onto the second part 1251B, making the third step impossible. To address this, a clearance groove 31 is provided at the end of the current transformer 3 closest to the second part 1251B to avoid it. Thus, when the current transformer 3 is pulled towards the first part 1251A, the clearance groove 31 can avoid the second part 1251B, allowing the bottom surface of the current transformer 3 to be positioned above the base wall plate 1113, thereby positioning it in the current transformer mounting groove 1112.

[0133] Figure 14 This is a three-dimensional structural diagram of a base 21 provided in an embodiment of this application. Figure 15 for Figure 14 The cross-sectional view of base 21 is shown. Please refer to... Figure 3 , Figure 14 and Figure 15 In one embodiment of this application, the base 21 includes a substrate 211. A plurality of first insulating plates 2111 are disposed on the side of the substrate 211 near the switch body 1. The plurality of first insulating plates 2111 are arranged in three rows and N columns. 2M mounting slots are formed on one side of the substrate 211 in a matrix arrangement of two rows and M columns, where N is 3, 4 or 5 and M is equal to N-1.

[0134] In this configuration, the M mounting slots in the first row are all first mounting slots 2112, used for mounting the first electrical connection structure 22. The M mounting slots in the second row are all second mounting slots 2113, used for mounting the second electrical connection structure 23. The first mounting slots 2112 and second mounting slots 2113 located in the same column are used to mount the first electrical connection structure 22 and the second electrical connection structure 23 of the same main circuit.

[0135] On the side of the substrate 211 away from the switch body 1, N evenly spaced isolation portions 2114 are sequentially arranged along a first direction, namely a first isolation portion, a second isolation portion, ..., an Nth isolation portion, and the width of each of the N isolation portions 2114 is greater than the width of the corresponding first insulating plate 2111 arranged along the row direction. Along the first direction, the N isolation portions 2114 extend relative to the corresponding first insulating plate 2111 in a direction away from the central axis of the base 21.

[0136] Along the first direction, a first opening is formed between two adjacent isolation portions 2114, through which the first terminal block 2223 or the second terminal block 2323 passes. Along the third direction, a first through hole 2115 is provided on the substrate 211 to connect the mounting groove and the first opening.

[0137] Among them, the first direction is parallel to the row direction, and the third direction, the row direction, and the column direction are perpendicular to each other.

[0138] For details, please refer to [link / reference]. Figure 3 , Figure 14 and Figure 15 The following describes the implementation method in detail using the base structure of a three-pole drawer switch as an example.

[0139] For a three-pole drawer-type switch, multiple first insulating plates 2111 are arranged in a three-row, four-column configuration. Six mounting slots arranged in a two-row, three-column matrix are formed on one side of the substrate 211. The three mounting slots in the first row are all first mounting slots 2112, used for mounting the first electrical connection structure 22. The three mounting slots in the second row are all second mounting slots 2113, used for mounting the second electrical connection structure 23. The first mounting slots 2112 and 2113 in the same column are used to mount the first electrical connection structure 22 and the second electrical connection structure 23 of the same main circuit. On the side of the substrate 211 away from the switch body 1, four isolation portions 2114 are provided along a first direction: a first isolation portion, a second isolation portion, a third isolation portion, and a fourth isolation portion. The width of each of the four second isolation portions is greater than the width of the corresponding first insulating plates 2111 arranged along the row direction. The second and third isolation portions are located on both sides of the second column of mounting slots, extending away from the second column of mounting slots relative to the wall panels in the first direction. The first isolation portion is located on the side of the first column mounting slot away from the second column mounting slot, extending away from the wall panel of the first column mounting slot. The fourth isolation portion is located on the side of the third column mounting slot away from the second column mounting slot, extending away from the wall panel of the third column mounting slot. Along the first direction, a first opening is formed between two adjacent isolation portions 2114, through which either the first terminal block 2223 or the second terminal block 2323 passes. Along the third direction, a first through hole 2115 is provided on the substrate 211, connecting the mounting slot and the first opening. The first direction is parallel to the row direction, while the third direction, the row direction, and the column direction are perpendicular to each other.

[0140] Figure 16 This is a schematic diagram of the assembly structure of the base and electrical connection structure. Please refer to it. Figure 3 , Figure 6 , Figures 14 to 16For a three-pole drawer-type switch, three sets of electrical connection structures are installed into three corresponding mounting slots from the side of the base plate 211 closest to the switch body 1. The first electrical connection structure 22 is installed into the first mounting slot 2112, and the second electrical connection structure 23 is installed into the second mounting slot 2113. During installation, the first wiring component 222 of the first electrical connection structure 22 is first installed into the first mounting slot 2112. The first terminal block 2223 of the first wiring component 222 extends from the base plate 211 and the first opening through the corresponding first through hole 2115. The third busbar 2222 of the first wiring component 222 is located within the first mounting slot 2112 and is fixedly connected to the base plate 211. Multiple second branch lines 12512 of the first wiring component 222 are located within the first mounting slot 2112 and face the switch body 1. Multiple first clamps 221 are correspondingly clamped onto the multiple second branch lines 12512. The installation method of the second electrical connection structure 23 is similar to that of the first electrical connection structure 22, and will not be described further here.

[0141] In this embodiment, the width of the isolation portion 2114 is greater than the width of the corresponding first insulating plate 2111 arranged along the row direction. Along the first direction, each isolation portion 2114 extends relative to the corresponding first insulating plate 2111 in a direction away from the central axis of the base 21. In this way, by widening the width of the isolation portion 2114, the creepage distance along the insulating surface between the first terminal blocks 2223 of different phases and between the second terminal blocks 2323 of different phases is increased, thereby helping to improve the insulation level of the drawer switch and prevent phase-to-phase short circuits.

[0142] It should be noted that, Figures 14 to 15 This is only one specific manifestation of the present application. In other implementations of the present application, the base structure of the drawer switch provided in the present application can also be used for two-pole drawer switches and four-pole drawer switches.

[0143] Please continue to refer to this. Figure 14 and Figure 15 In this application, the width of the isolation portion 2114 is greater than the width of the corresponding first insulating plate 2111 arranged along the row direction. Along the first direction, each isolation portion 2114 extends away from the central axis of the base 21 relative to the corresponding first insulating plate 2111. This causes the mounting slots on both sides to be misaligned with the first opening in the first direction. Due to the dimensional constraints of the base 21 in the first direction, in some cases, the first wiring component 222 and the second wiring component 232 can be inserted into the corresponding first mounting slot 2112 but are blocked by the isolation portion 2114, and the first terminal block 2223 and the second terminal block 2323 cannot extend out of the base 21 from the first through hole 2115.

[0144] Based on this, please continue to refer to Figure 14 and Figure 15In some embodiments of this application, along a first direction, the first mounting slot 2112 and / or the second mounting slot 2113 in the first column of mounting slots are provided with a first expansion slot 2116 on the sidewall away from the adjacent column of mounting slots. Along a third direction, the first expansion slot 2116 communicates with the first through hole 2115 corresponding to the corresponding mounting slot, and the bottom of the first expansion slot 2116 is on the same plane as the surface of the first isolation portion 2114 near the adjacent isolation portion 2114. And / or, the first mounting slot 2112 and / or the second mounting slot 2113 in the Mth column of mounting slots are provided with a second expansion slot 2117 on the sidewall away from the adjacent column of mounting slots. Along a third direction, the second expansion slot 2117 communicates with the first through hole 2115 corresponding to the corresponding mounting slot, and the bottom of the second expansion slot 2117 is on the same plane as the surface of the Mth isolation portion 2114 near the adjacent isolation portion 2114.

[0145] In this application, the sidewalls of the first mounting slot 2112 and / or the second mounting slot 2113 in the first column of mounting slots, away from the adjacent column of mounting slots, are the sidewalls of the first first insulating plate 2111 arranged along the first direction. Similarly, the sidewalls of the first mounting slot 2112 and / or the second mounting slot 2113 in the Mth column of mounting slots, away from the adjacent column of mounting slots, are the sidewalls of the last first insulating plate 2111 arranged along the first direction. The primary function of the first expansion slot 2116 and the second expansion slot 2117 in this application is to increase the width of the first through hole 2115, thereby facilitating the installation of the first wiring component 222 and the second wiring component 232.

[0146] For example, regarding the installation of the first wiring component 222, during installation, the first terminal block 2223 of the first wiring component 222 is oriented towards the first through hole 2115. The first wiring component 222 is inserted into the first mounting groove 2112 from the opening of the first mounting groove 2112. Then, the first wiring component 222 is moved towards the first insulating plate 2111 where the first expansion groove 2116 is located. Afterward, the first terminal block 2223 is brought into close contact with the bottom of the first expansion groove 2116, thereby avoiding the obstruction of the isolation part 2114, and passes through the first through hole 2115 along the first expansion groove 2116. The installation of the second wiring component 232 is similar to that of the first wiring component 222, and will not be described in detail here.

[0147] As can be seen from the above analysis, by providing a first expansion slot 2116 on the side wall of the first column mounting slot away from the adjacent column mounting slot, and providing a second expansion slot 2117 on the side wall of the M column mounting slot away from the adjacent column mounting slot, the influence of the isolation part 2114 on the assembly of the first wiring component 222 and the second wiring component 232 can be avoided, thereby helping to reduce the size of the drawer seat 2 in the first direction.

[0148] Please continue to refer to this. Figures 14 to 16In some embodiments of this application, the first expansion groove 2116 may be formed by the corresponding portion of the first first insulating plate 2111 protruding outward, and the second expansion groove 2117 may be formed by the corresponding portion of the last first insulating plate 2111 protruding outward.

[0149] Please continue to refer to this. Figures 14 to 16 In one embodiment of this application, the first wiring component 222 includes a first outgoing wire structure and a second outgoing wire structure.

[0150] The first type of cable outlet structure is located at the first mounting slot 2112 of the first row of mounting slots, and the wiring portion of the first terminal block 2223 extends out of the first through hole 2115 corresponding to the mounting slot. Along the first direction, the size of the wiring portion of the first terminal block 2223 is larger than the size of the third busbar 2222, and extends relative to the third busbar 2222 in a direction away from the central axis of the base 21.

[0151] The second type of cable exit structure is located at the first mounting slot 2112 of the Mth column mounting slot. In the second type of cable exit structure, the wiring portion of the first terminal block 2223 extends out of the first through hole 2115 corresponding to the mounting slot. Along the first direction, the size of the wiring portion of the first terminal block 2223 is larger than the size of the third busbar 2222, and extends relative to the third busbar 2222 in a direction away from the central axis of the base 21.

[0152] Specifically, in this application, the main function of the first terminal block 2223 is to provide an external wiring interface. The wiring portion of the first terminal block 2223 typically has a row of wiring holes for user wiring. In this application, along the first direction, the size of the wiring portion of the first terminal block 2223 is larger than the size of the third busbar 2222, which is equivalent to increasing the width of the wiring portion of the first terminal block 2223, thereby increasing the area of ​​the wiring portion. This increases the contact area between the first terminal block 2223 and the user connection busbar, helping to reduce the resistance and current density at that location, thus controlling temperature rise. Furthermore, the increased area of ​​the wiring portion of the first terminal block 2223 allows for the installation of larger diameter wiring bolts or more bolts to meet higher current rating connection requirements and ensure sufficient contact pressure.

[0153] Furthermore, in this embodiment, the wiring portions of the first terminal blocks 2223 at the first and Mth mounting slots extend away from the central axis of the base 21 relative to their respective third busbars 2222. This increases the phase spacing between adjacent first terminal blocks 2223, thereby reducing the probability of phase-to-phase short circuits and improving the operational reliability of the drawer switch.

[0154] As an example, please continue to refer to Figures 14 to 16 , Figures 14 to 16 The base 21 of a three-pole drawer switch has a third wiring structure. The first wiring component 222 also has a third wiring structure. The third wiring structure is located at the first mounting slot 2112 of the second row of mounting slots. In the third wiring structure, the wiring portion of the first terminal block 2223 extends out of the first through hole 2115 of the corresponding mounting slot, and the wiring portion of the first terminal block 2223 coincides with the central axis of the base 21 along the center line of the first direction.

[0155] Please continue to refer to this. Figures 14 to 16 In one embodiment of this application, the structure of the second wiring component 232 disposed at the second mounting slot 2113 of the first column mounting slot is the same as the first outgoing wire structure. The structure of the second wiring component 232 disposed at the second mounting slot 2113 of the Mth column mounting slot is the same as the second outgoing wire structure.

[0156] The structure of the second wiring component 232 is the same as that of the first wiring component 222. Its beneficial effects are the same as those of the first wiring component 222, and will not be repeated here.

[0157] Similarly, when the drawer switch is a three-pole or four-pole drawer switch, the second wiring component 232 also has a third wiring structure. The third wiring structure is located at the second mounting slot 2113 of the middle row mounting slot. In the third wiring structure, the wiring portion of the second terminal block 2323 extends out of the first through hole 2115 of the corresponding mounting slot, and the wiring portion of the second terminal block 2323 coincides with the central axis of the base 21 along the center line of the first direction.

[0158] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0159] The above-described embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application 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 of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A drawer-type switch, characterized in that, Includes a switch body and a drawer base; the switch body includes a first housing and at least one set of contact systems; The drawer base includes a base and at least one set of electrical connection structures. The base is located on one side of the switch body, and the electrical connection structures are fixed to the base. The contact system includes a stationary contact and a moving contact. The stationary contact includes an integrally formed contact body and a plurality of first branch lines. The contact body is located inside the first housing. The plurality of first branch lines are connected in parallel to the side of the contact body near the base and extend out of the first housing toward the base. There is a heat dissipation gap between two adjacent first branch lines. The moving contact includes a moving busbar, which includes an integrally formed second body busbar and a plurality of second branch busbars; the second body busbar is located inside the first housing; the plurality of second branch busbars are connected in parallel to the side of the second body busbar near the base and extend out of the first housing toward the base; There is a heat dissipation gap between two adjacent second branch paths; The electrical connection structure includes a first electrical connection structure and a second electrical connection structure. The first electrical connection structure includes multiple first clamps and a first wiring component. The first wiring component includes multiple integrally formed third branch lines, third busbars, and first terminal blocks. The multiple first clamps, the multiple third branch lines, and the third busbars are disposed in a first mounting groove on the side of the base near the switch body. The multiple third branch lines are arranged side by side on the side of the third busbar near the switch body, and there is a heat dissipation gap between adjacent third branch lines. The first terminal block is disposed on the other side of the third busbar and extends out of the base. When the switch body is inserted into the drawer base, the multiple first branch lines are electrically connected to the multiple third branch lines one by one through the multiple first clamps. The second electrical connection structure includes multiple second clamps and a second wiring component. The second wiring component includes multiple integrally formed fourth branch lines, fourth busbars, and second terminal blocks. Multiple first clamps, multiple fourth branch lines, and fourth busbars are disposed in the second mounting groove on the side of the base near the switch body. The multiple fourth branch lines are arranged side by side on the side of the fourth busbar near the switch body, with a heat dissipation gap between adjacent fourth branch lines. The second terminal block is disposed on the other side of the fourth busbar and extends out of the base. When the switch body is inserted into the drawer base, the multiple second branch lines are electrically connected to the multiple fourth branch lines one by one through the multiple second clamps.

2. The drawer-type switch according to claim 1, characterized in that, The contact system includes a first group of contact systems, a second group of contact systems, and a third group of contact systems arranged along a first direction. The first group of contact systems is disposed on the side closer to the first housing, and the third group of contact systems is disposed on the other side closer to the first housing. The second group of contact systems is arranged between the first group of contact systems and the third group of contact systems. The amount of copper used in the second group of contact systems is greater than that in the first group of contact systems and the third group of contact systems.

3. The drawer-type switch according to claim 2, characterized in that, For the same stationary contact, multiple first branches are arranged along a second direction on one side of the contact body, the second direction being perpendicular to the first direction; The dimensions of the contact body and the first branch row of the second contact system along the first direction are larger than the dimensions of the corresponding components in the first and third contact systems. Apart from this, the remaining structural parameters of the stationary contact in the second contact system are consistent with those of the first and third contact systems.

4. The drawer switch according to any one of claims 1 to 3, characterized in that, The switch body includes a current transformer; the first housing includes a base and a bottom plate; The base has a third mounting groove with an opening facing the base on one side near the base plate. The base plate is disposed at the opening of the third mounting groove and is fixedly connected to the base. The base also has a current transformer mounting groove at the end of the third mounting groove near the base plate. The moving contact is disposed in the third mounting slot, and the contact piece, flexible connection structure, and second body row of the moving contact are all located within the third mounting slot; a plurality of second branch rows are arranged along the second direction on one side of the second body row, extending along the third direction and protruding from the third mounting slot; the second branch row includes a first part and a second part connected together, wherein the first part extends from the second body row to the base plate, and the length of the portion of the first part outside the third mounting slot is sufficient to match the axial installation dimensions of the current transformer; the second part of the second branch row extends through the base plate toward the base; the third direction is perpendicular to the second direction; Along the second direction, the distance between the first portion of the second branch row near the base wall panel and the base wall panel is greater than the distance between the second portion and the base wall panel, so as to accommodate the current transformer; The current transformer is sleeved on the outside of the first part and positioned in the current transformer mounting slot.

5. The drawer-type switch according to claim 4, characterized in that, There are two second branch rows, and the two second branch rows are symmetrical about the second body row along the second direction; the distance between the first part of the two second branch rows is smaller than the distance between the second part.

6. The drawer-type switch according to claim 4, characterized in that, The axial dimension of the current transformer is greater than the installation length of the first part; The current transformer has a clearance groove at one end near the second part to avoid the second part.

7. The drawer-type switch according to claim 2 or 3, characterized in that, The base includes a base plate, and a plurality of first insulating plates are provided on the side of the base plate near the switch body. The plurality of first insulating plates are arranged in three rows and N columns. 2M mounting slots are formed on one side of the base plate in a matrix arrangement of two rows and M columns, where N is 3, 4 or 5 and M is equal to N-1. In this configuration, the M mounting slots in the first row are all the first mounting slots, used for the installation of the first electrical connection structure; the M mounting slots in the second row are all the second mounting slots, used for the installation of the second electrical connection structure; the first mounting slots and the second mounting slots in the same column are used to install the first electrical connection structure and the second electrical connection structure of the same main circuit. On the side of the substrate away from the switch body, N evenly spaced isolation portions are sequentially arranged along a first direction, namely the first isolation portion, the second isolation portion, ..., the Nth isolation portion, and the width of each of the N isolation portions is greater than the width of the corresponding first insulating plate arranged along the row direction; along the first direction, the N isolation portions extend relative to the corresponding first insulating plate in a direction away from the central axis of the base. Along a first direction, a first opening is formed between two adjacent isolation portions, and the first opening allows the first terminal block or the second terminal block to pass through; along a third direction, a first through hole is provided on the substrate to connect the mounting groove and the first opening; Wherein, the first direction is parallel to the row direction, and the third direction, the row direction, and the column direction are perpendicular to each other.

8. The drawer-type switch according to claim 7, characterized in that, Along the first direction, the first mounting slot and / or the second mounting slot in the first column of mounting slots are provided with a first expansion slot on the side wall away from the adjacent column of mounting slots; along the third direction, the first expansion slot communicates with the first through hole corresponding to the corresponding mounting slot, and the bottom of the first expansion slot and the surface of the first isolation part near the adjacent isolation part are located on the same plane. And / or, the first mounting slot and / or the second mounting slot in the Mth column of mounting slots are provided with a second expansion slot on the side wall away from the adjacent column of mounting slots; along the third direction, the second expansion slot communicates with the first through hole corresponding to the corresponding mounting slot, and the bottom of the second expansion slot is on the same plane as the surface of the Mth isolation part near the adjacent isolation part.

9. The drawer-type switch according to claim 8, characterized in that, The first wiring component includes a first type of outgoing wire structure and a second type of outgoing wire structure; The first type of cable outlet structure is disposed at the first mounting slot of the first column of mounting slots, and the wiring portion of the first terminal block extends out of the first through hole corresponding to the mounting slot; along the first direction, the size of the wiring portion of the first terminal block is larger than the size of the third busbar, and extends away from the central axis of the base relative to the third busbar. The second type of cable exit structure is set at the first mounting slot of the Mth column mounting slot; in the second type of cable exit structure, the wiring portion of the first terminal block extends out of the first through hole corresponding to the mounting slot; along the first direction, the size of the wiring portion of the first terminal block is larger than the size of the third busbar, and extends away from the central axis of the base relative to the third busbar.

10. The drawer-type switch according to claim 9, characterized in that, The structure of the second wiring component located at the second mounting slot of the first column mounting slot is the same as the first type of outgoing wire structure; the structure of the second wiring component located at the second mounting slot of the Mth column mounting slot is the same as the second type of outgoing wire structure.

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