Electrical devices with withdrawable structure

Abstract

The present invention discloses an electrical device with a pull-out structure, comprising a main body and a drawer device. The main body has a main body terminal, and the main body terminal has a busbar. The drawer device has a drawer terminal and a drive device, and the drawer terminal has an electrical connection device, and the drive device is installed on the side of the drawer device. When the main body enters the drawer device, the electrical connection device contacts the busbar, and the drawer terminal and the main body terminal are connected to form a conductive path. When the main body exits the drawer device, the electrical connection device is separated from the busbar, and the conductive path between the drawer terminal and the main body terminal is disconnected. The electrical connection device is connected to the drive device through a coupling transmission component. When the main body enters the drawer device, the drive device drives the electrical connection device to clamp the busbar through the coupling transmission component, or drives the electrical connection device to loosen the busbar through the coupling transmission component.

Description

Technical Field

[0001] The present invention relates to the field of electrical devices, and more particularly to an electrical device with a drawable structure. Background Art

[0002] Electrical devices with a withdrawable structure include: universal circuit breakers, molded case circuit breakers, automatic transfer switches with drawer devices, medium-voltage circuit breakers, medium-voltage switchgear, etc. The device with a withdrawable structure includes a main body and a drawer device. Bridge-type contacts are used on the main body as the main body busbar, and a contact bridge is provided on the drawer device for achieving electrical connection with the main body busbar. The contact bridge on the drawer device is connected to the external input and output line terminals. When the main body is pushed into the drawer device, the main body busbar contacts the contact bridge to form a conductive path, and the main body is connected to the external input and output line terminals. When the main body is pulled out of the drawer device, the main body busbar is separated from the contact bridge, cutting off the conductive path and achieving isolation for testing or maintenance. The main body busbar and the contact bridge constitute the electrical connection device of the withdrawable structure electrical device.

[0003] Figure 1a and Figure 1b The structure diagram of the electrical connection device used in the conventional drawable electrical device is disclosed. Figure 1a and Figure 1b As shown, the contact bridge installed on the drawer device includes: a contact piece 101, a shaft 102, a tension spring 103 and a bracket 104. There are several contact pieces 101, and two contact pieces 101 of the same shape and size are arranged opposite to each other to form a group. Several groups of contact pieces are stacked and assembled into two symmetrical rows of stacked contact pieces. A groove is formed near the middle of the outer side of each contact piece 101, and the shaft 102 is arranged in the groove. The middle of the tension spring 103 is located between the two rows of contact pieces 101, and the two ends of the tension spring 103 are respectively fixed on a pair of shafts 102. The bracket 104 used to reduce the mutual friction between the contact pieces and act as a separator is inserted between each group of contact pieces 101, and the bracket 104 is arranged at both ends and in the middle of the two rows of contact pieces. The contact piece 101, the shaft 102, the tension spring 103 and the bracket 104 together form the following Figure 1a and Figure 1b The contact bridge shown. At one end of the contact bridge ( Figure 1a The left end shown in the figure) is composed of the ends of the two rows of contact pieces facing each other to form a clamping head for clamping the main busbar 105. Figure 1a The right side end shown in the figure) is connected to the external input and output terminal 106 on the drawer device.

[0004] Each contact piece 101 forms a contact point with the main body busbar 105. The two rows of contact pieces together form a multi-contact area. A gap is left between the two rows of contact pieces for the main body busbar 105. To ensure effective contact when the main body busbar 105 is inserted into this gap, the size of this gap is set to be smaller than the thickness of the main body busbar 105. When the main body is pushed into the drawer device, the main body busbar 105 inserts into the gap between the two rows of contact pieces. Because the thickness of the main body busbar 105 is greater than the gap, the main body busbar 105 pushes the two rows of contact pieces apart, causing the tension spring 103 to deform. The spring force generated by the deformation of the tension spring 103 acts on the contact pieces, clamping the two rows of contact pieces inward. Under this action, as the main body busbar continues to advance, the two rows of contact pieces clamp the busbar more and more tightly. This results in more and more contact pieces coming into contact with the busbar, forming contact points. The greater the number of contact points, the lower the contact resistance. To ensure reliable contact during operation, the spring force of the tension spring is increased, increasing the clamping force of the contact strips on the main body busbar, ensuring the number of contact points and contact stability, thereby reducing contact resistance. However, the drawbacks of increasing the spring force of the tension spring are also very obvious: when the main body is pushed into the drawer device, the friction between the main body busbar and the contact strips, as well as the force required for the main body busbar to open the two rows of contact strips, are the main resistances that need to be overcome. When the spring force of the tension spring is increased, the force required to open the contact strips and the friction between the main body busbar and the contact strips will increase significantly. Typically, the clamping force provided by a single contact bridge is around 800N. A three-pole circuit breaker has at least six electrical connection devices, including three incoming electrical connection devices and three outgoing electrical connection devices. Therefore, increasing the clamping force will exponentially increase the resistance to inserting the main body busbar into the contact bridge, ultimately making it difficult to insert the main body busbar into the electrical connection device, and the operating force of the drive device of the entire drawer device will be unacceptably large.

[0005] Furthermore, the contact bridge formed by the contact piece 101, shaft 102, tension spring 103, and bracket 104 only allows a small range of rotation within the plane in which the contact piece lies, resulting in minimal freedom of movement. If the angle of the main busbar deviates, the contact bridge structure cannot adapt to and eliminate the positional or angular deviation of the main busbar. This deviation reduces the number of contact pieces that effectively contact the main busbar, reducing both the number of contacts and the contact area, adversely affecting performance and service life. Furthermore, this deviation prevents the main busbar from being inserted squarely into the gap, causing it to bend, increasing the force required to separate the two rows of contact pieces and the friction between the main busbar and the contact pieces. In some large-frame products, such as those with a power rating of 4000A or higher, the wide lateral width leads to significant positional deviations between the various electrical connectors, and the presence of two or three electrical connectors on a single input or output terminal increases the operating force of the drawer mechanism exponentially.

[0006] In summary, existing electrical connection devices suffer from the following drawbacks: a significant conflict between assembly difficulty and performance. From a performance perspective, a higher clamping force is desirable to increase the number of contacts, expand the contact area, and reduce contact resistance. A larger contact area can also reduce heat generation during use and extend the overall service life of the electrical connection device. However, increasing the clamping force significantly increases installation resistance, exponentially increasing the difficulty of installation and significantly hindering device installation and maintenance. Reducing the clamping force to facilitate assembly can lead to insufficient engagement between the busbar and the contact piece, a low number of contacts, and some loose connections. A low number of contacts reduces the contact area and increases contact resistance. These loose connections generate significant heat, easily causing overheating and burns during use. The contact bridge requires high installation precision and cannot accommodate and eliminate angular or positional deviations in the busbar. These deviations can degrade contact performance, reducing performance and service life. However, increasing the angular and positional precision of the busbar increases installation difficulty. Furthermore, existing electrical connection devices use a large amount of copper, resulting in high costs. Summary of the Invention

[0007] According to one embodiment of the present invention, an electrical device with a pull-out structure is proposed, comprising a main body and a drawer device. The main body has a main body terminal, and the main body terminal has a busbar. The drawer device has a drawer terminal and a drive device, and the drawer terminal has an electrical connection device, and the drive device is installed on the side of the drawer device. When the main body enters the drawer device, the electrical connection device contacts the busbar, and the drawer terminal and the main body terminal are connected to form a conductive path. When the main body exits the drawer device, the electrical connection device is separated from the busbar, and the conductive path between the drawer terminal and the main body terminal is disconnected. The electrical connection device is connected to the drive device via a coupling transmission assembly. When the main body enters the drawer device, the drive device drives the electrical connection device to clamp the busbar via the coupling transmission assembly, or drives the electrical connection device to loosen the busbar via the coupling transmission assembly.

[0008] In one embodiment, the withdrawable electrical device is multi-pole, each pole has its own corresponding drawer terminal and electrical connection device, the electrical connection devices of different poles are connected by a linkage mechanism, and the multiple electrical connection devices connected by the linkage mechanism synchronously clamp or release the busbar.

[0009] In one embodiment, several drawer terminal blocks are arranged in multiple layers, and the electrical connection devices on the same layer are connected to each other through a linkage mechanism and are connected to a drive device through a coupling transmission assembly. The drive device drives the several electrical connection devices on the same layer to synchronously clamp or release the busbar through the coupling transmission assembly and the linkage mechanism.

[0010] In one embodiment, the drive device includes a drive shaft and a drive gear set, wherein the drive shaft has a screw portion, the drive gear set engages with the screw portion, and the drive shaft drives the drive gear set via the screw portion. The coupling transmission assembly includes an insulating connector and a coupling gear, wherein the insulating connector and the coupling gear are coaxial, the insulating connector is connected to the electrical connection device, the coupling gear engages with the drive gear set, and the drive gear set drives the insulating connector via the coupling gear.

[0011] In one embodiment, the driving gear set includes: a screw gear, an intermediate gear and several transmission gears, the screw gear is engaged with the screw portion of the driving shaft, the intermediate gear rotates coaxially with the screw gear, several transmission gears are arranged around the intermediate gear and are respectively engaged with the intermediate gears, and the coupling gears of different layers of the coupling transmission assembly are respectively engaged with the corresponding transmission gears.

[0012] In one embodiment, an electrical connection device includes a drawer connection assembly, a main body connection assembly, and a flexible assembly. The drawer connection assembly is connected to the drawer terminal. The main body connection assembly includes a contact piece with a clamping mechanism that causes the contact piece to closely contact and clamp the busbar of the main body terminal. The flexible assembly connects the drawer connection assembly and the main body connection assembly, and the main body connection assembly, the flexible assembly, and the drawer connection assembly form a conductive path. The contact piece of the main body connection assembly is offset to accommodate positional deviations of the main body busbar, so that the contact piece closely contacts and clamps the main body busbar. The flexible assembly absorbs the deviation of the contact piece by deforming itself, preventing the deviation from being transmitted to the drawer connection assembly.

[0013] In one embodiment, the body connection assembly includes a contact piece and a clamping mechanism. The contact piece is tightly attached to and clamps the body busbar, and the contact piece is connected to the flexible assembly. The clamping mechanism applies a clamping force from the outside of the contact piece, causing the contact piece to contract inward to tightly attach to and clamp the body busbar.

[0014] In one embodiment, the clamping mechanism includes a fastener, a bearing, an elastic member, and a force-applying member. The fastener is mounted on the contact piece. When the fastener is tightened, the contact piece contracts inward. The elastic member and the force-applying member apply a clamping force to the contact piece. The bearing is mounted between the fastener and the elastic member to absorb rotational movement of the fastener, preventing the rotational movement from being transmitted to the elastic member and the force-applying member.

[0015] In one embodiment, the linkage mechanism is an insulating transmission member, which connects the fasteners of the two electrical connection devices so that the fasteners of the two electrical connection devices move synchronously.

[0016] In one embodiment, the insulating connector of the coupling transmission assembly is connected to the fastener of the electrical connection device, and the coupling gear drives the insulating connector to drive the fastener of the electrical connection device to operate.

[0017] The electrical connection device in the electrical device of the pull-out structure of the present invention solves the contradiction between the insertion and clamping operations from a structural perspective. The clamping operation can be performed after the main body busbar is inserted between the contact pieces. A sufficiently large clamping force can be applied to ensure contact, and the clamping force will not affect the assembly of the main body busbar. In addition, the electrical connection device is provided with a flexible component, which can absorb a certain offset through its own deformation, so that the contact piece can produce a certain offset following the position offset of the main body busbar, so as to fully fit the main body busbar and ensure the contact area and contact stability. The linkage mechanism connects the clamping mechanisms of the two electrical connection devices. The two electrical connection devices are usually connected to the input end and the output end respectively. The linkage mechanism enables multiple groups of electrical connection devices to clamp their respective main body busbars at the same time, thereby simplifying the operation method.

[0018] In summary, the withdrawable electrical device of the present invention has the following technical effects:

[0019] 1) Each set of electrical connection components is fastened with a fastening device to ensure reliable electrical connection.

[0020] 2) Multiple sets of fastening devices are clamped in a coupled manner, making the electrical connection clamping operation very simple, that is, multiple sets of electrical connection components can be clamped simultaneously through one operation.

[0021] 3) The fastening device includes an elastic component, which has a huge clamping force and a large compression stroke. At the same time, the connecting busbar is a soft connecting busbar with a certain degree of freedom. In this way, when multiple sets of electrical connection components are out of sync or the drawer device structure is deformed, etc., it is ensured that multiple sets of electrical connection mechanisms can achieve reliable electrical connection at the same time without being affected by the poor synchronization of the main body and the drawer device.

[0022] 4) Since flexible busbars, fasteners, and elastic parts are used to ensure electrical connection, each set of electrical connection devices can make reliable contact, unlike the existing technology that is affected by the installation and matching accuracy. At the same time, the contact pressure and contact area of ​​each set of electrical connection devices are increased, which greatly reduces the contact resistance, reduces the amount of copper used, and achieves material saving and energy reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which like reference numerals represent like features throughout, wherein:

[0024] Figure 1a and Figure 1b The present invention discloses a structural diagram of an electrical connection device used in a draw-out electrical device in the prior art.

[0025] Figure 2 A structural diagram of a withdrawable electrical device according to an embodiment of the present invention is disclosed.

[0026] Figure 3a and Figure 3b A structural diagram of an electrical connection device in a withdrawable electrical device according to an embodiment of the present invention is disclosed.

[0027] Figure 4 A structural diagram of a busbar in a withdrawable electrical device according to an embodiment of the present invention is disclosed.

[0028] Figure 5 A schematic diagram of a drawer device in a pull-out electrical appliance according to an embodiment of the present invention is disclosed.

[0029] Figure 6 A structural diagram of a drawer device in a pull-out electrical device according to an embodiment of the present invention is disclosed.

[0030] Figure 7 A structural diagram of a linkage mechanism connecting two electrical connection components in a withdrawable electrical device according to an embodiment of the present invention is disclosed.

[0031] Figure 8 A structural diagram is disclosed in which electrical connection devices on the same layer of a withdrawable electrical device according to an embodiment of the present invention are connected via a linkage structure and a coupling transmission assembly.

[0032] Figure 9 A structural diagram of a driving device in a withdrawable electrical device according to an embodiment of the present invention is disclosed. DETAILED DESCRIPTION

[0033] Figure 2 The structure diagram of a withdrawable electrical device according to an embodiment of the present invention is disclosed. Figure 2As shown, this withdrawable electrical device includes a body 601 and a drawer assembly 602. The body 601 has body terminals, which have busbars. The drawer assembly 602 has drawer terminals and a drive assembly 603, which has an electrical connection device. The drive assembly 603 is mounted on the side of the drawer assembly 602. When the body 601 enters the drawer assembly 602, the electrical connection device contacts the busbars, connecting the drawer terminals and the body terminals to form a conductive path. When the body 601 exits the drawer assembly 602, the electrical connection device separates from the busbars, disconnecting the conductive path between the drawer terminals and the body terminals. The electrical connection device is connected to the drive assembly 603 via a coupling transmission assembly. When the body 601 enters the drawer assembly 602, the drive assembly 603 drives the electrical connection device to clamp the busbars, or to release the busbars, via the coupling transmission assembly. In one embodiment, the body 601 is guided forward and backward relative to the drawer assembly 602 by a slide rail mounted on the drawer assembly 602, enabling the body 601 to enter or exit the drawer assembly 602. Slide rail technology is a mature technology in this field, such as the slide rail disclosed in CN203086038U. The slide rail structure is not the focus of the present invention, so it will not be described here.

[0034] The following first introduces the electrical connection device used in the drawer-type electrical device. The electrical connection device is installed on the drawer terminal of the drawer device. Figure 3a and Figure 3b The structure diagram of the electrical connection device in the withdrawable electrical device according to one embodiment of the present invention is disclosed, wherein Figure 3a is a three-dimensional structural diagram of the electrical connection device, Figure 3bThis is a side view of the electrical connection device. As shown, the electrical connection device includes a drawer connection assembly 202, a main body connection assembly 204, and a flexible assembly 206. The drawer connection assembly 202 is connected to the drawer wiring terminals. The main body connection assembly 204 includes a contact piece with a clamping mechanism that secures the contact piece against and clamps the main body busbar. The flexible assembly 206 connects the drawer connection assembly 202 and the main body connection assembly 204. The main body connection assembly 204, the flexible assembly 206, and the drawer connection assembly 202 form a conductive path. The contact piece of the main body connection assembly 204 deflects to accommodate positional deviations of the main body busbar, ensuring that the contact piece secures and clamps the main body busbar. The flexible assembly 206 absorbs this contact piece deflection by deforming itself, preventing it from being transmitted to the drawer connection assembly 202. During installation, the main body busbar is subject to slight deviations in position, angle, or shape. The electrical connection device of the present invention utilizes the flexible assembly 206 to accommodate such deviations. The contact pieces of the main body connection assembly of the electrical connection device of the present invention can follow the actual state of the main body busbar, closely adhering to and clamping the main body busbar. If the main body busbar is positionally or angularly offset, the contact pieces of the main body connection assembly 204 will also experience a corresponding positional or angular offset. In this way, the positional or angular offset of the main body busbar does not affect the contact performance, and the contact pieces of the main body connection assembly can maintain the contact area and contact stability with the main body busbar. The flexible assembly 206 has the ability to deform within a certain range. In one embodiment, the flexible assembly 206 is formed from multiple layers of copper foil, multiple layers of copper tape, or copper braided wire. If the contact pieces of the main body connection assembly 204 are offset due to the positional or angular offset of the main body busbar, the flexible assembly 206 absorbs the offset by its own deformation, preventing the offset from being transmitted to the drawer connection assembly 202. The drawer connection assembly 202 is fixedly connected to the drawer terminal block, which is mounted on the drawer device and connected to the input and output terminals of the drawer device. The drawer connection component 202 is a rigid structure, and its position and installation angle cannot change. By utilizing the deformation of the flexible component 206 , the position or angle deviation of the contact piece of the body connection component 204 is absorbed and will not be transmitted to the drawer connection component 202 .

[0035] Continue to refer Figure 3a and Figure 3bAs shown, the main body connection assembly 204 includes: a contact piece 241, a clamping structure, and a reset mechanism. The contact piece 241 consists of two pieces, and the two contact pieces 241 abut and clamp the main body busbar from both sides. The contact piece is connected to the flexible assembly. In the illustrated embodiment, the flexible assembly 206 also consists of two pieces, and each contact piece 241 is connected to a flexible assembly 206. The clamping mechanism applies a clamping force from the outside of the two contact pieces 241, causing the two contact pieces to contract inward to abut and clamp the main body busbar. The reset mechanism applies a reset force from the inside of the two contact pieces 241, causing the two contact pieces 241 to open outward to reset. In one embodiment, the clamping mechanism includes: a fastener, a bearing member, an elastic member, and a force-applying member. The fastener is mounted on the two contact pieces 241. When the fastener is tightened, the two contact pieces contract inward. The elastic member and the force-applying member apply a clamping force to the two contact pieces 241. The bearing is installed between the fastener and the elastic member. The bearing absorbs the rotation of the fastener when it is in motion, so that the rotation is not transmitted to the elastic member and the force-applying member. Figure 3a and Figure 3bIn the illustrated embodiment, the fasteners are bolts 242 and nuts 243, the bearing element is a plane bearing 244, the elastic element is a disc spring assembly 245, and the force-applying element is a pressure plate 246. Contact piece 241 has a threaded hole for bolt 242 to pass through. Bolt 242 passes through the first and second contact pieces (lower contact pieces) from the outside (upper) of the first contact piece (the upper piece), respectively. Nut 243 is screwed onto the second end of the bolt from the outside (lower) of the second contact piece. In the first embodiment, bolt 242 is a single-headed bolt with a larger head located outside the first contact piece. The shank of bolt 242 passes through the first and second contact pieces, and nut 243 is screwed onto the shank of bolt 242. Plane bearing 244, disc spring assembly 245, and pressure plate 246 are installed between the first end (head) of bolt 242 and the first contact piece (the upper piece). Disc spring assembly 245 includes several disc springs. The number of disc springs in disc spring assembly 245 can be determined based on the required clamping force. When a higher clamping force is required, the number of disc springs can be increased; when a lower clamping force is required, a smaller number can be used. In actual use, an appropriate number of disc springs is configured to enable a single electrical connection device to generate a clamping force exceeding 1500N. This effective clamping force is significantly greater than the 800N clamping force of conventional electrical connection devices. To evenly distribute the clamping force generated by the disc springs across the contact piece 241, a pressure plate 246 is used. This pressure plate 246 evenly distributes the clamping force across the contact piece to clamp the busbar. This evenly distributed clamping force increases the contact area between the contact piece and the busbar, ensuring more stable contact. During the clamping operation, the bolt 242 and nut 243 rotate relative to each other, contracting the two contact pieces 241 inward. The disc spring assembly 245 and pressure plate 246 apply a clamping force to the contact piece 241 to clamp the busbar. The plane bearing 244 absorbs the relative rotation of the bolt and nut, preventing it from being transmitted to the disc spring and pressure plate. Furthermore, the plane bearing 244 reduces the rotational force required for relative rotation between the bolt 242 and nut 243 through its own rotation. A roller bearing is used as the plane bearing; in other embodiments, a ball bearing can also be used. The reset mechanism is a reset spring 247 mounted on the bolt 242. The reset spring 247 is located between the two contact pieces 241. During the clamping operation, the bolt and nut rotate relative to each other, contracting the return spring 247 and compressing it. During the reset operation, the bolt and nut rotate relative to each other, expanding the return spring 247 and restoring it. The return spring 247 applies a spring force to the inner sides of the two contact pieces 241, causing them to open outward and return to their original position. Under the action of the reset spring 247, after the bolt and nut are loosened, the two contact pieces 241 return to their original position, with a large gap between them, making it easy to remove the busbar.

[0036] Continue to refer Figure 3a and Figure 3b As shown, the drawer connection assembly 202 includes a connecting piece 221 and a heat dissipation mechanism. The connecting piece 221 is fixed to the drawer device and electrically connected to the input and output terminals of the drawer device. In the illustrated embodiment, the connecting piece 221 is two separate pieces, each connected to a flexible component 206. In other words, each contact piece 241 is connected to a connecting piece 221 via a flexible component 206, with two sets of connecting pieces 221 in total, one above the other. The heat dissipation mechanism is mounted on the connecting piece. In the illustrated embodiment, the heat dissipation structure includes a backing plate 222 and a fixing bracket 223. The backing plate 222 is a hollow bracket structure and is positioned between the two connecting pieces 221. Two fixing brackets 223 secure the backing plate 222 from the outside of the two connecting pieces 221, securing it between the two connecting pieces 221 to create a gap for convenient installation of the busbars for the input and output terminals.

[0037] Figure 4 A diagram illustrating the structure of a busbar in a withdrawable electrical device according to one embodiment of the present invention is provided. Busbar 612 is mounted on the main body terminals, which are mounted on the main body 601. Busbar 612 is inserted between two contact pieces 241 of the electrical connection device. The two contact pieces 241 clamp the busbar 612, forming contact and thus a conductive path. In the illustrated embodiment, to accommodate the position and shape of the bolts 242 in the electrical connection device, busbar 612 has an arcuate notch 613. This notch 613 mates with the bolts 242, allowing the busbar 612 to fully fit between the contact pieces 241 for a larger contact area.

[0038] In one embodiment, the drawer-type electrical device of the present invention is a multi-pole structure, the drawer device has multi-pole drawer connection terminals, and correspondingly, the body also has multi-pole body connection terminals. Figure 5 A schematic diagram of a drawer device in a pull-out electrical appliance according to an embodiment of the present invention is disclosed. Figure 6 The structure diagram of the drawer device in the pull-out structure electrical appliance according to one embodiment of the present invention is disclosed. Figure 5 and Figure 6 As shown, the withdrawable electrical device is multi-pole, and each pole has its own corresponding drawer terminal and electrical connection device, so the drawer device 602 has multiple drawer terminal and electrical connection device 622. Correspondingly, the body also has multiple body terminal and busbar 612 corresponding to the multiple poles. Figure 6In order to show the structure more clearly, most of the structure of the main body is hidden, and only the busbar 612 connected to the electrical connection device 622 is shown. The electrical connection devices 622 of different poles are connected by a linkage mechanism 623. The multiple electrical connection devices 622 connected by the linkage mechanism 623 synchronously clamp or loosen their respective busbars 612. Figure 5 and Figure 6 In the illustrated embodiment, the drawer terminals are arranged in multiple layers. In this illustrated embodiment, the drawer terminals and corresponding electrical connectors 622 are arranged in two layers, one above the other. The electrical connectors 622 on the same layer are interconnected via a linkage mechanism 623. Furthermore, the electrical connector 622 closest to the drive device 603 is connected to the drive device 603 via a coupling transmission assembly 624. The drive device 603, via the coupling transmission assembly 624 and linkage mechanism 623, drives the electrical connectors 622 on the same layer to synchronously clamp or release their respective busbars 612.

[0039] Figure 7 The structure diagram of the linkage mechanism connecting two electrical connection components in a pull-out electrical device according to one embodiment of the present invention is disclosed. The linkage mechanism 623 connects the clamping mechanism in the main connection component of the two electrical connection devices 622. The linkage mechanism 623 is insulated. The linkage mechanism 623 electrically insulates and isolates the two electrical connection devices 622, and mechanically enables the clamping mechanisms of the two electrical connection devices to operate synchronously. The structure of the linkage mechanism 623 is compatible with the structure of the clamping mechanism of the electrical connection device. Figure 3a and Figure 3b For the electrical connection device shown, linkage mechanism 623 is an insulating transmission element that connects the fasteners of the two electrical connection devices, allowing the fasteners of the two electrical connection devices to operate synchronously. In this embodiment, the disc spring, which serves as an elastic element in electrical connection device 622, not only provides clamping force but also absorbs the deviation in the clamping stroke of the two electrical connection devices. When a clamping operation is performed by one electrical connection device, linkage mechanism 623 causes the other electrical connection device to operate simultaneously. Because the elastic disc spring has a compression stroke, the travel deviation of the two electrical connection devices is absorbed by the elastic element. By configuring multiple disc springs, a larger compression stroke and clamping force can be achieved. In this embodiment, the clamping force of both electrical connection devices can be maintained between 1500N and 2000N. Of course, a higher clamping force can be generated by adding disc springs.

[0040] Multiple electrical connection devices 622 on the same layer can be interconnected through the linkage mechanism 623 and the coupling transmission assembly 624. The electrical connection device 622 closest to the drive device 603 is connected to the drive device 603 via the coupling transmission assembly 624, and the remaining electrical connection devices 622 are interconnected via the linkage mechanism 623. This allows the drive device 603 to drive the multiple electrical connection devices 622 on the same layer to operate synchronously, thereby clamping or loosening their respective busbars 612, through the coupling transmission assembly 624 and the linkage mechanism 623. Figure 8 The present invention discloses a structural diagram of a removable electrical device in which the electrical connection devices on the same layer are connected through a linkage structure and a coupling transmission assembly. Figure 8 Mainly for illustration and illustrative purposes, the busbar 612, electrical connection device 622, linkage mechanism 623 and coupling transmission assembly 624 are shown in exemplary structures, which may be different from the structures of corresponding components in the embodiments shown in the previous figure.

[0041] Back to Figure 5 and Figure 6 , Figure 5 and Figure 6 This can be considered an example of a three-pole circuit breaker. The figure shows six sets of terminals, arranged in two layers, with three sets of terminals on each layer. From a layer perspective, terminals on the same layer belong to either the power supply side or the load side. From a column perspective, power supply terminals and load-side terminals of the same phase are aligned and located above and below the same column. Each pole of a three-pole circuit breaker has power supply terminals and load-side terminals, aligned above and below. The power supply terminals and load-side terminals for different phases of the three poles are arranged horizontally. The load-side electrical connectors for poles A, B, and C are driven by a linkage mechanism to clamp the corresponding busbars. Another linkage mechanism is driven by another linkage mechanism to clamp the power supply terminals for poles A, B, and C. The power supply and load sides each form their own transmission circuits.

[0042] Each electrical connection device is driven by a driving device to synchronously clamp or release the corresponding busbar. Figure 9 The structure diagram of the driving device in the withdrawable electrical device according to one embodiment of the present invention is disclosed. Figure 9As shown, the drive device 603 includes: a drive shaft 631 and a drive gear set. The drive shaft 631 has a screw portion. The drive gear set engages with the screw portion. When the drive shaft rotates, the drive gear set is driven to rotate via the screw portion. The coupling transmission assembly 624 includes: an insulating connector 625 and a coupling gear 626. The insulating connector 625 and the coupling gear 626 are coaxial. The insulating connector 625 is connected to the electrical connection device, more precisely, the insulating connector 625 is connected to the fastener of the electrical connection device. The coupling gear 626 engages with the drive gear set. The drive gear set drives the insulating connector 625 to rotate via the coupling gear 626, thereby driving the fastener of the electrical connection device to clamp or loosen the busbar. Figure 9 The drive device of the embodiment shown is Figure 5 and Figure 6 The structure of the electrical device of the withdrawable structure shown is adapted. In the illustrated embodiment, the driving gear set includes: a screw gear 632, an intermediate gear 633 and a plurality of transmission gears 634. The screw gear 632 is engaged with the screw portion of the driving shaft 631, and the intermediate gear 633 rotates coaxially with the screw gear 632. A plurality of transmission gears 634 are arranged around the intermediate gear 633 and are respectively engaged with the intermediate gear 633. The coupling gears 626 of the coupling transmission components 624 at different layers are respectively engaged with the corresponding transmission gears 634. In the illustrated embodiment, two transmission gears 634 are respectively arranged on the upper and lower sides of the intermediate gear 633 and are engaged with the intermediate gear 633. The two transmission gears 634 are respectively engaged with the coupling gears 626 of the coupling transmission components 624 at the upper and lower layers. The drive shaft 631 rotates, driving the screw gear 632 and the intermediate gear 633 to rotate, and then drives the transmission gear 634 and the coupling gear 626 to rotate through gear engagement, driving the coupling transmission assembly 624 to rotate, so that the electrical connection device clamps or loosens the corresponding busbar.

[0043] The working process of the withdrawable electrical device of the present invention is as follows:

[0044] First, the driving device arranged on one side of the drawer device operates the driving shaft through an external operating device. The screw portion of the driving shaft drives the screw gear, and through the gear meshing transmission of the screw gear, the intermediate gear and the transmission gear, drives the coupling gear to rotate. The coupling gear drives the insulating connector to rotate, drives the first electrical connection device to move, and then drives several electrical connection devices on the same layer to move synchronously through the linkage mechanism connected between the various electrical connection devices. The above process forms the transmission route of the drawer device of the present invention from the driving device to multiple electrical connection devices. The driving shaft of the driving device can be driven by an external operating device. For example, the rocker handle in CN202363793U can be used as a manual operating mechanism. How the driving shaft is driven is not the focus of the present invention, so it will not be described in detail.

[0045] Driven by the linkage mechanism, each electrical connection device synchronously clamps or releases the busbar. Through the above-mentioned transmission route and the clamping structure of the electrical connection device, the synchronous clamping or releasing action driven by the driving mechanism is realized.

[0046] The electrical connection device in the electrical device of the pull-out structure of the present invention solves the contradiction between the insertion and clamping operations from a structural perspective. The clamping operation can be performed after the main body busbar is inserted between the contact pieces. A sufficiently large clamping force can be applied to ensure contact, and the clamping force will not affect the assembly of the main body busbar. In addition, the electrical connection device is provided with a flexible component, which can absorb a certain offset through its own deformation, so that the contact piece can produce a certain offset following the position offset of the main body busbar, so as to fully fit the main body busbar and ensure the contact area and contact stability. The linkage mechanism connects the clamping mechanisms of the two electrical connection devices. The two electrical connection devices are usually connected to the input end and the output end respectively. The linkage mechanism enables multiple groups of electrical connection devices to clamp their respective main body busbars at the same time, simplifying the operation method.

[0047] In summary, the withdrawable electrical device of the present invention has the following technical effects:

[0048] 1) Each set of electrical connection components is fastened with a fastening device to ensure reliable electrical connection.

[0049] 2) Multiple sets of fastening devices are clamped in a coupled manner, making the electrical connection clamping operation very simple, that is, multiple sets of electrical connection components can be clamped simultaneously through one operation.

[0050] 3) The fastening device includes an elastic component, which has a huge clamping force and a large compression stroke. At the same time, the connecting busbar is a soft connecting busbar with a certain degree of freedom. In this way, when multiple sets of electrical connection components are out of sync or the drawer device structure is deformed, etc., it is ensured that multiple sets of electrical connection mechanisms can achieve reliable electrical connection at the same time without being affected by the poor synchronization of the main body and the drawer device.

[0051] 4) Since flexible busbars, fasteners, and elastic parts are used to ensure electrical connection, each set of electrical connection devices can make reliable contact, unlike the existing technology that is affected by the installation and matching accuracy. At the same time, the contact pressure and contact area of ​​each set of electrical connection devices are increased, which greatly reduces the contact resistance, reduces the amount of copper used, and achieves material saving and energy reduction.

[0052] The above embodiments are provided to persons familiar with the art for implementing or using the present invention. Personnel familiar with the art may make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the scope of protection of the present invention is not limited to the above embodiments, but should be the maximum scope of the innovative features mentioned in the claims.

Claims

1. A drawer-type electrical device, comprising a body and a drawer device, characterized in that: The body has a body wiring terminal, and the body wiring terminal has a busbar; The drawer device comprises a drawer connection terminal and a drive device, wherein the drawer connection terminal has an electrical connection device, and the drive device is mounted on a side of the drawer device; When the body enters the drawer device, the electrical connection device contacts the busbar, the drawer terminal and the body terminal are connected to form a conductive path, and when the body exits the drawer device, the electrical connection device is separated from the busbar, and the conductive path between the drawer terminal and the body terminal is disconnected; The electrical connection device is connected to the driving device through a coupling transmission assembly. When the body enters the drawer device, the driving device drives the electrical connection device to clamp the busbar through the coupling transmission assembly, or drives the electrical connection device to loosen the busbar through the coupling transmission assembly. Wherein, the electrical connection device includes: A drawer connection component connected to the drawer wiring terminal; The main body connection assembly includes a clamping mechanism and contact pieces. Each group of contact pieces includes two contact pieces. The clamping mechanism applies a clamping force from the outside of the two contact pieces so that the two contact pieces are tightly attached to and clamp the main body busbar from both sides. A flexible component is connected to the drawer connection component and the body connection component, the body connection component, the flexible component and the drawer connection component form a conductive path, and the contact piece is connected to the flexible component; The contact piece of the body connection assembly adapts to the positional deviation of the body busbar and is offset so that the contact piece is in close contact with and clamps the body busbar. The flexible assembly absorbs the offset of the contact piece by its own deformation, so that the offset is not transmitted to the drawer connection assembly. The clamping mechanism includes: a fastener, an elastic member and a force-applying member; the fastener is installed on the contact piece, and when the fastener is tightened, the contact piece contracts inward; the elastic member and the force-applying member apply a clamping force to the contact piece.

2. The draw-out electrical device according to claim 1, wherein: The electrical device of the withdrawable structure is multi-pole, each pole has its own corresponding drawer terminal and electrical connection device, the electrical connection devices of different poles are connected by a linkage mechanism, and the multiple electrical connection devices connected by the linkage mechanism synchronously clamp or release the busbar.

3. The drawable electrical device according to claim 2, wherein: Several drawer terminal blocks are arranged in multiple layers. The electrical connection devices on the same layer are connected to each other through a linkage mechanism and are connected to the drive device through a coupling transmission assembly. The drive device drives the several electrical connection devices on the same layer to synchronously clamp or release the busbar through the coupling transmission assembly and the linkage mechanism.

4. The draw-out electrical device according to claim 3, wherein: The driving device includes: a driving shaft and a driving gear set, the driving shaft has a screw portion, the driving gear set is engaged with the screw portion, and the driving shaft drives the driving gear set through the screw portion; The coupling transmission assembly includes: an insulating connector and a coupling gear, the insulating connector and the coupling gear are coaxial, the insulating connector is connected to the electrical connection device, the coupling gear is engaged with the driving gear set, and the driving gear set drives the insulating connector through the coupling gear.

5. The draw-out electrical device according to claim 4, wherein: The driving gear set includes: a screw gear, an intermediate gear and several transmission gears. The screw gear is engaged with the screw portion of the driving shaft. The intermediate gear rotates coaxially with the screw gear. Several transmission gears are arranged around the intermediate gear and are respectively engaged with the intermediate gears. The coupling gears of the coupling transmission assemblies at different layers are respectively engaged with the corresponding transmission gears.

6. The withdrawable electrical device according to claim 2, wherein: The linkage mechanism is an insulating transmission member, which connects the fasteners of the two electrical connection devices so that the fasteners of the two electrical connection devices move synchronously.

7. The drawable electrical device according to claim 1, wherein: The insulating connector of the coupling transmission assembly is connected to the fastener of the electrical connection device, and the coupling gear drives the insulating connector to drive the fastener of the electrical connection device to move.

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