Electrical device and its linked electrical connection assembly

Abstract

The present invention discloses a linkage electrical connection assembly, including a linkage mechanism and two electrical connection devices. The electrical connection device is connected between the body of an electrical device of a pull-out structure and the pull-out device, and includes: a pull-out device connection assembly, a body connection assembly, and a flexible assembly. The pull-out device connection assembly is fixed on the pull-out device and electrically connected to the input and output terminals of the pull-out device. The body connection assembly includes a contact piece with a clamping mechanism, and the clamping mechanism makes the contact piece close to and clamp the body busbar. The flexible assembly connects the pull-out device connection assembly and the body connection assembly to form a conductive path. The contact piece of the body connection assembly adapts to the positional deviation of the body busbar and produces a deviation, so that the contact piece is close to and clamps the body busbar, and the flexible assembly absorbs the deviation of the contact piece with its own deformation, so that the deviation is not transmitted to the pull-out device connection assembly. The linkage mechanism connects the clamping mechanisms of the two electrical connection devices, and the linkage mechanism is insulated and makes the clamping mechanisms of the two electrical connection devices act synchronously.

Description

Technical Field

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

[0002] The 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 switch cabinets, etc. The device with a withdrawable structure includes a body and a withdrawable device. The bridge-type contact is used as the body busbar on the body, and the contact bridge is provided on the withdrawable device to achieve electrical connection with the body busbar. The contact bridge on the withdrawable device is connected to the external input and output terminals. When the body is pushed into the withdrawable device, the body busbar contacts the contact bridge to form a conductive path, and the body is connected to the external input and output terminals. When the body is pulled out of the drawer device, the body busbar is separated from the contact bridge, the conductive path is cut off, and isolation is achieved for testing or maintenance. The body busbar and the contact bridge constitute the electrical connection device of the withdrawable structure electrical device. In some products, the bridge-type contact is also set on the withdrawable device and the contact bridge is set on the body, but in this configuration, the busbar and the contact bridge still constitute the electrical connection device of the withdrawable structure electrical device, which is the same as the aforementioned structure in basic principle.

[0003] Figure 1a and Figure 1b The structure diagram of the prior art electrical connection device used in the drawable electrical device is disclosed. Figure 1a and Figure 1b As shown, the contact bridge installed on the pull-out device includes: a contact piece 101, a shaft 102, a tension spring 103 and a bracket 104. The contact piece 101 has a plurality of pieces, 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 play a separating role 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 line terminal 106 on the withdrawable device.

[0004] Each contact piece 101 forms a contact point that contacts 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 placing the main body busbar 105. In order to ensure that the main body busbar 105 can form an effective contact when inserted into the gap, the width of the gap is set to be smaller than the thickness of the main body busbar 105. When the main body is pushed into the pull-out device, the main body busbar 105 is inserted into the gap between the two rows of contact pieces. Since the thickness of the main body busbar 105 is greater than the gap, the main body busbar 105 will stretch the two rows of contact pieces apart, and the stretched contact pieces will cause the tension spring 103 to deform. The spring force generated by the deformation of the tension spring 103 acts on the contact piece, clamping the two rows of contact pieces inward. Under such action, as the main body busbar continues to advance, the two rows of contact pieces will clamp the busbar more and more. In this way, more and more contact pieces will contact the busbar to form contacts. The more contacts there are, the smaller the contact resistance will be. In order to ensure reliable contact of the contacts during operation, the spring force of the tension spring is increased, so that the clamping force of the contact piece on the main body busbar is increased, the number of contact points and contact stability are ensured, and the contact resistance is reduced. However, the defects of increasing the spring force of the tension spring are also very obvious: when the main body is pushed into the pull-out device, the friction between the main body busbar and the contact piece and the force required for the main body busbar to open two rows of contact pieces are the main resistances that need to be overcome for advancement. When the spring force of the tension spring increases, the force required to open the contact piece and the friction between the main body busbar and the contact piece will increase significantly. Usually, the clamping force provided by a single contact bridge is about 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 multiply the resistance of the main body busbar to inserting the contact bridge, which will eventually make it difficult for the main body busbar to be inserted into the electrical connection device, and the operating force of the drive device of the entire drawer device will be too large to be accepted.

[0005] In addition, the contact bridge composed of the contact piece 101, the shaft 102, the tension spring 103 and the bracket 104 only allows the contact piece to rotate within a small range within the plane where the contact piece is located, and the contact piece has extremely small freedom of movement. If there is a deviation in the angle of the main body busbar, the contact bridge of this structure cannot adapt to and eliminate the position or angle deviation of the main body busbar. This deviation will lead to a reduction in the number of contact pieces that are effectively in contact with the main body busbar, and the number of contacts and the contact area will be reduced, which is not conducive to performance and service life. Moreover, this deviation will make it impossible for the main body busbar to be inserted directly into the gap, resulting in deflection, resulting in an increase in the force of opening the two rows of contact pieces and the friction between the main body busbar and the contact piece. In some large shell frames such as products above 4000A, due to the wide lateral width, the position deviation of each electrical connection device is large, and a single incoming or outgoing line end has two or three electrical connection devices, so the operating force of the drawer device will be multiplied.

[0006] In summary, the electrical connection devices used in the prior art have the following defects: there is an obvious contradiction between the difficulty of assembly and the performance in use. From the perspective of performance in use, it is hoped that the clamping force is as large as possible to increase the number of contacts, increase the contact area, and reduce the contact resistance. A larger contact area can also reduce the heat generated during use and extend the overall service life of the electrical connection device. However, an increase in the clamping force will greatly increase the installation resistance, making the installation difficulty multiplied, which is very unfavorable for the installation and maintenance of the equipment. If the clamping force is reduced to facilitate assembly, the insufficient clamping force will lead to insufficient engagement between the main body busbar and the contact piece, a small number of contacts, and some contacts being virtual. The small number of contacts will lead to a reduction in contact area, an increase in contact resistance, and the virtual contact will generate a lot of heat, which is easy to cause the contact point to burn out due to excessive temperature during use. The contact bridge has high requirements for installation accuracy and cannot adapt to and eliminate the angle or position deviation of the main body busbar. The angle or position deviation of the main body busbar will cause the contact performance to decrease, resulting in a decrease in performance and service life. However, increasing the angle and position accuracy of the main body busbar will increase the difficulty of installation.

[0007] The structure of the electrical connection device in the prior art makes it impossible to resolve the contradiction between assembly and use performance, and only a compromise solution can be obtained between the two. However, the compromise solution cannot achieve the best use performance. Summary of the invention

[0008] The present invention aims to provide an electrical connection device which separates the insertion and clamping operations and can fit the main body busbar as closely as possible to increase the contact area.

[0009] According to one embodiment of the present invention, a linkage electrical connection assembly is proposed, comprising two electrical connection devices and a linkage mechanism connecting the two electrical connection devices. The two electrical connection devices are connected between the body of the electrical device of the withdrawable structure and the withdrawable device, and the two electrical connection devices are respectively connected to the incoming line end and the outgoing line end of the electrical device, and the electrical connection device comprises: a withdrawable device connection assembly, a body connection assembly, and a flexible assembly. The withdrawable device connection assembly is fixed on the withdrawable device and is electrically connected to the incoming and outgoing line ends of the withdrawable device. The body connection assembly comprises a contact piece with a clamping mechanism, and the clamping mechanism makes the contact piece close to and clamp the body busbar. The flexible assembly connects the withdrawable device connection assembly and the body connection assembly, and the body connection assembly, the flexible assembly and the withdrawable device connection assembly form a conductive path. The contact piece of the body connection assembly adapts to the positional deviation of the body busbar and generates a deviation, so that the contact piece is close to and clamps the body busbar, and the flexible assembly absorbs the deviation of the contact piece by its own deformation, so that the deviation is not transmitted to the withdrawable device connection assembly. The linkage mechanism connects the clamping mechanisms of the two electrical connection devices, the linkage mechanism is insulated, and the linkage mechanism enables the clamping mechanisms of the two electrical connection devices to act synchronously.

[0010] In one embodiment, the body connection assembly includes: a contact piece, a clamping mechanism, and a reset mechanism. The contact piece is close 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, so that the contact piece contracts inward to close to and clamp the body busbar. The reset mechanism applies a reset force from the inside of the contact piece, so that the contact piece opens outward to reset.

[0011] In one embodiment, the clamping mechanism includes: a fastener, a bearing member, 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 shrinks inward. The elastic member and the force-applying member apply a clamping force to the contact piece. The bearing member is installed between the fastener and the elastic member, and the bearing member 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. 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 act synchronously.

[0012] In one embodiment, the contact pieces are two pieces, and the two contact pieces are tightly attached to and clamped against the main busbar from both sides. Fasteners are installed on the two contact pieces. When the fasteners are tightened, the two contact pieces shrink inward. A reset mechanism is installed on the inner side of the two contact pieces, and the reset mechanism causes the two contact pieces to open outward for reset.

[0013] In one embodiment, the fasteners are bolts and nuts, the bearing member is a plane bearing, the elastic member is a disc spring assembly, and the force-applying member is a pressure plate. The contact piece is provided with a screw hole for the bolt to pass through, and the bolt passes through the first contact piece and the second contact piece in turn from the outside of the first contact piece, and the nut is rotatably installed on the second end of the bolt from the outside of the second contact piece. A plane bearing, a disc spring assembly and a pressure plate are installed between the first end of the bolt and the first contact piece, and the disc spring assembly includes several disc springs. The bolt and the nut shrink due to relative rotation, and the two contact pieces shrink inward, and the disc spring assembly and the pressure plate apply a clamping force to the contact piece. The plane bearing absorbs the relative rotation of the bolt and the nut, so that the disc spring and the pressure plate do not rotate. The linkage mechanism is an insulating transmission member, and the two ends of the insulating transmission member have interfaces, and the interfaces at the two ends are respectively connected to the bolts of the two electrical connection devices, so that the bolts of the two electrical connection devices rotate synchronously.

[0014] In one embodiment, the fasteners are bolts and nuts, the bearing member is a plane bearing, the elastic member is a disc spring assembly, and the force-applying member is a pressure plate. The two pressure plates are respectively attached to the outer sides of the two contact plates and are respectively fixed to the contact plates. The pressure plates are provided with screw holes for the bolts to pass through. The bolts pass through the first pressure plate and the second pressure plate in turn from the outer side of the first pressure plate, and the nuts are rotatably mounted on the second end of the bolts from the outer side of the second pressure plate. A plane bearing and a disc spring assembly are installed between the first end of the bolt and the first pressure plate, and the disc spring assembly includes several disc springs. The bolt and the nut shrink due to relative rotation, and the two pressure plates shrink inward, and the disc spring assembly and the pressure plate apply a clamping force to the contact plate. The plane bearing absorbs the relative rotation of the bolt and the nut, so that the disc spring and the pressure plate do not rotate. The linkage mechanism is an insulating transmission member, and the two ends of the insulating transmission member have interfaces, and the interfaces at the two ends are respectively connected to the bolts of the two electrical connection devices, so that the bolts of the two electrical connection devices rotate synchronously.

[0015] In one embodiment, the reset mechanism is a reset spring, which is installed on the bolt and located between the two contact sheets or the two pressure plates. The bolt and the nut rotate relative to each other and contract, and the reset spring is compressed. The bolt and the nut rotate relative to each other and expand, and the reset spring returns to its original state. The reset spring applies a spring force to the inner sides of the two contact sheets or the two pressure plates, so that the two contact sheets open outward.

[0016] According to one embodiment of the present invention, a linkage electrical connection assembly is proposed, comprising an electrical connection device and a linkage mechanism. The electrical connection device is connected between the body of an electrical device of a withdrawable structure and the withdrawable device, the electrical device having multiple phases, and the electrical connection device comprises: a withdrawable device connection assembly, a plurality of body connection assemblies and a flexible assembly. The withdrawable device connection assembly is fixed on the withdrawable device and electrically connected to the input and output terminals of the withdrawable device. Each of the plurality of body connection assemblies corresponds to one phase of the electrical device, and each body connection assembly comprises a contact piece having a clamping mechanism, and the clamping mechanism makes the contact piece close to and clamp the body busbar of the phase. The flexible assembly connects the withdrawable device connection assembly and the body connection assembly, and the body connection assembly, the flexible assembly and the withdrawable device connection assembly form a conductive path. The contact piece of the body connection assembly is offset to adapt to the positional offset of the body busbar, so that the contact piece is close to and clamps the body busbar, and the flexible assembly absorbs the offset of the contact piece by its own deformation, so that the offset is not transmitted to the withdrawable device connection assembly. The linkage mechanism connects the clamping mechanisms of the plurality of body connection components, and the linkage mechanism enables the clamping mechanisms of the plurality of body connection components to act synchronously.

[0017] According to one embodiment of the present invention, a withdrawable electrical device is provided, comprising a body and a withdrawable device, wherein the body and the withdrawable device have a separation position and an insertion position, and the body and the withdrawable device are connected by a linkage electrical connection assembly as described above, wherein, in the separation position, the body withdraws from the withdrawable device, the body busbar is separated from the body connection assembly, and the body busbar is not in contact with the contact sheet. In the insertion position, the body is pushed into the withdrawable device, the body busbar is inserted into the body connection assembly, and the contact sheet is tightly attached to and clamps the body busbar.

[0018] The electrical connection device of the present invention solves the contradiction between the insertion and clamping operations from a structural point of view. 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 terminal and the output terminal 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.

[0019] According to the present invention, when the main body busbar is inserted into the electrical connection device, it can be achieved that there is no mutual force between the main body busbar and the electrical connection device, such as the force of the contact piece to open the contact piece in the prior art, and the friction between the main body busbar and the contact piece. The driving device of the pull-out device can push the main body of the electrical device with a very small force, so that the main body busbar is inserted into the electrical connection device.

[0020] The electrical connection device can be configured with a large clamping force to clamp the main busbar as needed, so that the overall contact resistance of the electrical device is greatly reduced, especially in long-term use, the power consumption is greatly reduced, and the use cost is greatly saved. The higher the rated current of the electrical device, the more significant this advantage is. On the other hand, the reduction of contact resistance reduces the temperature rise of the product and the heat generation of the electrical device. There is no need to consider a large heat dissipation space, which is conducive to reducing the size of the product and improving the reliability of long-term use.

[0021] In addition to providing a larger clamping force, the presence of the elastic member also absorbs the deviation of the clamping stroke between the two electrical connection devices, so that after synchronous action, the difference in the clamping force of the two electrical connection devices is very small and both maintain a larger clamping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 the same reference numerals always represent the same features, wherein:

[0023] Figure 1a and Figure 1b The invention discloses a structural diagram of an electric connection device of the prior art used in an electrical device of a pull-out structure.

[0024] Figure 2 A structural diagram of a linked electrical connection assembly according to an embodiment of the present invention is disclosed.

[0025] Figure 3a and Figure 3b A structural diagram of an electrical connection device in a linked electrical connection assembly according to an embodiment of the present invention is disclosed.

[0026] Figure 4a and Figure 4b A structural diagram of a plane bearing used in an electrical connection device is disclosed.

[0027] Figure 5 A structural diagram of a pad used in an electrical connection device is disclosed.

[0028] Figure 6a and Figure 6b A usage state diagram of a linked electrical connection assembly according to an embodiment of the present invention is disclosed.

[0029] Figure 7a and Figure 7b A structural diagram of another embodiment of an electrical connection device that can be used for the linked electrical connection assembly of the present invention is disclosed.

[0030] Figure 8 and Fig. 9 The structural diagrams of other variations of the electrical connection device that can be used for the linked electrical connection assembly of the present invention are disclosed. Various variations have body connection assemblies with different structures to accommodate body busbars with different structures.

[0031] Fig.10 A structural diagram of a linked electrical connection assembly according to another embodiment of the present invention is disclosed.

[0032] Fig.11 A structural diagram of a linked electrical connection assembly according to another embodiment of the present invention is disclosed.

[0033] Fig.12a and Figure 12b A structural diagram of a linked electrical connection assembly according to another embodiment of the present invention is disclosed.

[0034] Fig.13a and Fig.13b A schematic diagram of the separation position and insertion position of an electrical device of a pull-out structure applicable to the linked electrical connection assembly of the present invention is disclosed.

[0035] Fig.14a , Fig.14b and Fig.14c The invention discloses a schematic diagram of the principle of eliminating eddy current loss by an electrical connection device in a linked electrical connection assembly. DETAILED DESCRIPTION

[0036] The present invention proposes an electrical connection device that separates the insertion and clamping operations and can fit the main body busbar as closely as possible to increase the contact area. Considering that in actual applications, circuit breakers or switch components usually have two ports for incoming and outgoing lines, electrical connection devices are used in pairs. For two electrical connection devices applied to the incoming and outgoing ends of the same circuit, it is hoped that they can act synchronously and clamp or release the main body busbar synchronously. Therefore, the present invention proposes a linked electrical connection assembly. Figure 2 The structural diagram of a linkage electrical connection assembly according to an embodiment of the present invention is disclosed. As shown in the figure, the linkage electrical connection assembly includes two electrical connection devices 200 and a linkage mechanism 210 connecting the two electrical connection devices, and the two electrical connection devices 200 are respectively connected to the incoming end and the outgoing end of the electrical device. In this application, the linkage mechanism 210 is electrically insulated to ensure that no conductive path is formed between the two electrical connection devices to cause a short circuit. The linkage mechanism 210 mechanically ensures that the two electrical connection devices act synchronously.

[0037] The following first introduces the electrical connection device in the linked electrical connection assembly. Figure 3a and Figure 3b The structure diagram of the electrical connection device in the linked electrical connection assembly 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 3b2 is a side view of the electrical connection device. As shown in the figure, the electrical connection device includes: a pull-out device connection component 202, a body connection component 204 and a flexible component 206. The pull-out device connection component 202 is fixed on the pull-out device and is electrically connected to the input and output terminals of the pull-out device. The body connection component 204 includes a contact piece with a clamping mechanism, and the clamping mechanism makes the contact piece close to and clamp the body busbar. The flexible component 206 connects the pull-out device connection component 202 and the body connection component 204. The body connection component 204, the flexible component 206 and the pull-out device connection component 202 form a conductive path. The contact piece of the body connection component 204 adapts to the positional deviation of the body busbar and produces a deviation, so that the contact piece is close to and clamps the body busbar. The flexible component 206 absorbs the deviation of the contact piece by its own deformation, so that the deviation is not transmitted to the pull-out device connection component 202. During the installation process, the main body busbar will inevitably have a slight deviation in position, angle or shape. The electrical connection device of the present invention absorbs this deviation of the main body busbar through the flexible component 206. The contact piece of the main body connection component of the electrical connection device of the present invention can follow the actual state of the main body busbar, close to and clamp the main body busbar. If the main body busbar has a position or angle offset, the contact piece of the main body connection component 204 will also produce a corresponding position or angle offset. In this way, the position or angle offset of the main body busbar will not affect the contact performance, and the contact piece of the main body connection component can ensure the contact area and contact stability with the main body busbar. The flexible component 206 has the ability to deform within a certain range. In one embodiment, the flexible component 206 is formed by multiple layers of copper foil, multiple layers of copper strip or copper braided wire. If the contact piece of the main body connection component 204 deviates following the position or angle offset of the main body busbar, the flexible component 206 absorbs the offset of the contact piece with its own deformation, so that the offset is not transmitted to the pull-out device connection component 202. The drawer base connection assembly 202 is fixedly mounted on the drawer device and connected to the input and output terminals of the drawer device. The drawer base connection assembly 202 is a rigid structure, and its position and installation angle cannot change. By using the deformation of the flexible assembly 206, the position or angle deviation of the contact piece of the body connection assembly 204 is absorbed and will not be transmitted to the drawer base connection assembly.

[0038] Continue to refer Figure 3a and Figure 3b As shown, the main body connection assembly 204 includes: a contact piece 241, a clamping structure and a reset mechanism. The contact piece 241 is two pieces, and the two contact pieces 241 are closely attached to and clamp the main body busbar 208 from both sides (refer to Figure 6b). The contact piece is connected to the flexible component. In the illustrated embodiment, the flexible component 206 also consists of two pieces, and each contact piece 241 is respectively connected to one flexible component 206. The clamping mechanism applies a clamping force from the outside of the two contact pieces 241, so that the two contact pieces shrink inward to fit tightly against and clamp the main body busbar 208. The reset mechanism applies a reset force from the inside of the two contact pieces 241, so that the two contact pieces 241 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 installed on the two contact pieces 241, and when the fastener is tightened, the two contact pieces shrink inward. The elastic member and the force-applying member apply a clamping force to the two contact pieces 241. The bearing member is installed between the fastener and the elastic member, and the bearing member absorbs the rotation of the fastener when it is in action, 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 fastener is a bolt 242 and a nut 243, the bearing member is a plane bearing 244, the elastic member is a disc spring assembly 245, and the force-applying member is a pressure plate 246. The contact piece 241 has a screw hole for the bolt 242 to pass through. The bolt 242 passes through the first contact piece (upper contact piece) and the second contact piece (lower contact piece) in sequence from the outer side (upper side) of the first contact piece (upper contact piece), and the nut 243 is rotatably mounted on the second end of the bolt from the outer side (lower side) of the second contact piece. In the first embodiment, the bolt 242 is a single-head bolt, the head of the bolt 242 is larger, and the head is located on the outer side of the first contact piece, the rod of the bolt 242 passes through the first contact piece and the second contact piece, and the nut 243 is tightened on the rod of the bolt 242. The plane bearing 244, the disc spring assembly 245 and the pressure plate 246 are installed between the first end (head) of the bolt 242 and the first contact piece (upper contact piece). The disc spring assembly 245 includes a plurality of disc springs. The number of disc springs in the disc spring assembly 245 can be determined according to the size of the required clamping force. When a larger clamping force is required, the number of disc springs can be increased, and when only a smaller clamping force is required, a smaller number of disc springs can be used. In actual use, a suitable number of disc springs will be configured to enable a single electrical connection device to generate a clamping force of more than 1500N, and its effective clamping force is much greater than the 800N clamping force of the electrical connection device in the prior art. In order to evenly distribute the clamping force generated by the disc spring to the contact piece 241, a pressure plate 246 will be used. The pressure plate 246 evenly distributes the clamping force to the contact piece to clamp the main body busbar. The evenly distributed clamping force makes the contact area between the contact piece and the main body busbar larger and the contact more stable. When performing the clamping operation, the bolt 242 and the nut 243 rotate relative to each other and shrink, and the two contact pieces 241 shrink inward, and the disc spring assembly 245 and the pressure plate 246 apply a clamping force to the contact piece 241 to clamp the main body busbar. On one hand, the plane bearing 244 absorbs the relative rotation between the bolt and the nut so that the above rotation will not be transmitted to the disc spring and the pressure plate. On the other hand, the plane bearing 244 can reduce the rotational operating force required for the relative rotation between the bolt 242 and the nut 243 by its own rotation. Figure 4a and Figure 4b The structural diagram of the plane bearing used in the electrical connection device is disclosed. Figure 4a This is the exploded structure diagram of the plane bearing. Figure 4b This is a combined structural diagram of a plane bearing. In the illustrated embodiment, the plane bearing uses a roller plane bearing. In other embodiments, a ball plane bearing may also be used. Back Figure 3a and Figure 3bIn the embodiment shown, the reset mechanism is a reset spring 247, which is mounted on the bolt 242. The reset spring 247 is located between the two contact pieces 241. When the clamping operation is performed, the bolt and the nut rotate relative to each other and contract, and the reset spring 247 is compressed. When the reset operation is performed, the bolt and the nut rotate relative to each other and expand, and the reset spring 247 is restored. The reset spring 247 applies a spring force to the inner side of the two contact pieces 241, so that the two contact pieces 241 open outward and reset. Under the action of the reset spring 247, after the bolt and the nut are loosened, the two contact pieces 241 can return to their initial position with a large spacing, so that the main body busbar can be easily pulled out.

[0039] Back to Figure 2 In the embodiment shown, for the linked electrical connection assembly of the present invention, the linkage mechanism 210 connects the clamping mechanisms in the main connection assemblies of the two electrical connection devices, and the linkage mechanism 210 is insulated. The linkage mechanism 210 electrically insulates and isolates the two electrical connection devices 200, and mechanically the linkage mechanism 210 enables the clamping mechanisms of the two electrical connection devices to operate synchronously. The structure of the linkage mechanism 210 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, the linkage mechanism 210 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. Figure 3a and Figure 3b The electrical connection device shown in the figure has a single-head bolt 242 and a nut 243 as the fasteners. The insulating transmission member 210 is mainly connected to the two single-head bolts 242. The insulating transmission member 210 has interfaces at both ends, and the interfaces at both ends are respectively connected to the bolts 242 of the two electrical connection devices, so that the bolts 242 of the two electrical connection devices rotate synchronously, thereby synchronously clamping or loosening the main body busbar. In this embodiment, since the bolt 242 is a single-head bolt, the shapes of the two ends of the bolt are different. Therefore, during assembly, Figure 2The head of the bolt 242 of the upper middle electrical connection device is upward, and the head of the bolt 242 of the lower electrical connection device is downward, so that both ends of the insulating transmission member 210 are connected to the screw portion of the bolt, and both ends of the insulating transmission member 210 can be provided with interfaces matching the shape of the screw, and the screw portion of the bolt is inserted into the interface to achieve linkage. The shape of the screw and the interface is generally polygonal, such as a quadrilateral or a hexagon. The polygon can prevent the screw from slipping in the interface and reduce the loss of torque during the transmission process. In addition, the disc spring as an elastic member in this embodiment, in addition to providing clamping force, also absorbs the deviation of the clamping stroke of the two electrical connection devices. When the clamping operation is implemented by one electrical connection device, the linkage mechanism 210 causes the other electrical connection device to act at the same time. Since the disc spring of the elastic member has a compression stroke, the stroke deviation of the two electrical connection devices is absorbed by the elastic member. By configuring multiple disc springs, a larger compression stroke and clamping force can be obtained. In this embodiment, the clamping force of the two electrical connection devices can be maintained between 1500N and 2000N. Of course, a larger clamping force can be generated by adding disc springs.

[0040] Continue to refer Figure 3a and Figure 3b In the illustrated embodiment, the pull-out device connection component 202 includes: a connecting piece 221 and a heat dissipation mechanism. The connecting piece 221 is fixed on the pull-out device and electrically connected to the input and output terminals of the pull-out device. In the illustrated embodiment, the connecting piece 221 is divided into two pieces, and the two connecting pieces 221 are separately arranged, and the two connecting pieces 221 are respectively connected to a flexible component 206. In other words, each contact piece 241 is connected to a connecting piece 221 through a flexible component 206, and there are two groups in total, upper and lower. The heat dissipation mechanism is installed on the connecting piece. In the illustrated embodiment, the heat dissipation structure includes: a pad 222 and a fixed bracket 223. The pad 222 is a hollow bracket structure, and the pad 222 is arranged between the two connecting pieces 221. Figure 5 The structure diagram of the pad used in the electrical connection device according to an embodiment of the present invention is disclosed. The hollow bracket structure of the pad 222 is conducive to heat dissipation. Two fixing brackets 223 fix the pad 222 from the outside of the two connecting pieces 221, and fix the pad 222 between the two connecting pieces 221 to form a gap to facilitate the installation of the busbar of the input and output terminals.

[0041] Figure 6a and Figure 6bThe use state diagram of the linkage electrical connection assembly according to one embodiment of the present invention is disclosed. The electrical devices with a withdrawable structure include: a universal circuit breaker, a molded case circuit breaker, an automatic transfer switch with a drawer device, a medium-voltage circuit breaker, a medium-voltage switch cabinet, etc. The device with a withdrawable structure includes a main body and a withdrawable device. As described above, the circuit breaker or switch assembly usually has two ports for incoming and outgoing lines, so the electrical connection devices are used in pairs. The linkage electrical connection assembly of the present invention includes two electrical connection devices 200 and a linkage mechanism 210 connecting the two electrical connection devices, the two electrical connection devices 200 are respectively connected to the incoming and outgoing ends of the same circuit, and the electrical connection device is connected between the main body of the electrical device with a withdrawable structure and the withdrawable device. The withdrawable device connection assembly is fixed on the withdrawable device and is electrically connected to the incoming and outgoing line ends of the withdrawable device. The clamping mechanism of the main body connection assembly makes the contact piece close to and clamps the main body busbar 208. The linkage mechanism 210 connects the two electrical connection devices 200, and the linkage mechanism 210 enables the two electrical connection devices 200 to synchronously clamp or loosen the main body busbars at the incoming and outgoing ends. In addition, the linkage mechanism 210 is insulated, which can prevent short circuits between the electrical connection devices due to conduction.

[0042] Figure 7a and Figure 7b The structural diagram of another embodiment of the electrical connection device that can be used for the interlocking electrical connection assembly of the present invention is disclosed. The structure of the pull-out device connection assembly and the flexible assembly in the electrical connection device of this embodiment is basically the same as that of the previous embodiment. The structure of the contact piece and the reset mechanism in the main body connection assembly is also basically the same as that of the previous embodiment, except that the clamping mechanism is different. For the sake of simplicity of description, the pull-out device connection assembly, the flexible assembly, the contact piece and the reset mechanism in the main body connection assembly in the electrical connection device of this embodiment will not be described again, and the relevant content can refer to the previous description of the first embodiment. Reference Figure 7a As shown, the function of the clamping mechanism of the electrical connection device of this embodiment is also to apply a clamping force from the outside of the two contact pieces, so that the two contact pieces shrink inward to fit tightly against and clamp the main body busbar. The clamping mechanism includes: a fastener, a bearing member, an elastic member and a force-applying member. The fastener is installed on the two contact pieces, and when the fastener is tightened, the two contact pieces shrink inward. The elastic member and the force-applying member apply a clamping force to the two contact pieces. The bearing member is installed between the fastener and the elastic member, and the bearing member 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 7a and Figure 7b In the illustrated embodiment, the fastener is a stud bolt 342 , the bearing member is a plane bearing 344 , the elastic member is a disc spring assembly 345 , and the force-applying member is a pressure plate 346 . Figure 7bThe structure diagram of the stud bolt 342 is disclosed. The middle section of the stud bolt 342 is a connecting portion 301, and the two sides of the connecting portion are two threaded areas 302. The threads in the two threaded areas 302 are opposite to each other. If one is defined as a forward thread, the other is a reverse thread. On the outside of the threaded area 302, there is a passive part 303 at each end of the stud bolt 342. Back Figure 7a , the contact piece has a screw hole for the stud bolt 342 to pass through. The stud bolt 342 passes through the first contact piece and the second contact piece (lower contact piece) from the outside (upper) of the first contact piece (upper contact piece) in sequence. The pressure plate 346 of the second embodiment is provided with a threaded hole, and two pressure plates 346 are used to cooperate with the two threaded areas of the stud bolt 342 respectively. The upper pressure plate 346 is rotatably mounted on the upper threaded area, and the upper threaded area is defined as the positive thread here. The lower pressure plate 346 is rotatably mounted on the lower threaded area, and the lower threaded area is defined as the reverse thread. The upper threaded area of ​​the stud bolt 342 is located on the outside (upper) of the first contact piece, and the lower threaded area is located on the outside (lower) of the second contact piece. In this way, the two pressure plates 346 are respectively located above the first contact piece and below the second contact piece, and are tightly attached to the two contact pieces from the outside. On the stud bolt 342, a plane bearing 344 and a disc spring assembly 345 are installed between the upper pressure plate 346 and the first contact piece (upper contact piece). The disc spring assembly 345 includes several disc springs. The number of disc springs in the disc spring assembly 345 can be determined according to the required clamping force. In this embodiment, the pressure plate 346 not only plays the role of evenly distributing the clamping force to the contact piece, but also replaces the role of the nut in the first embodiment, and cooperates with the stud bolt 343 to tighten or loosen. The reset mechanism in this embodiment is still the reset spring 347, which is installed on the stud bolt 342. The reset spring 347 is located between the two contact pieces. When performing the clamping operation, at least one of the two ends of the stud bolt 342 is rotated, and under the joint action of the forward and reverse threaded areas of the stud bolt, the upper and lower pressure plates 346 simultaneously contract and act on the contact piece, so that the contact piece clamps the main body busbar. When performing the loosening operation, the upper and lower pressure plates also loosen the busbar at the same time. The stud bolt and the two pressure plates act simultaneously to clamp or loosen, which can speed up the operation speed and double it, which is conducive to saving the operation time and operation space of the drawer device.

[0043] for Figure 7a and Figure 7b For the electrical connection device shown, Figure 2 The insulating transmission member 210 shown can still be used as a linkage mechanism. Figure 3a and Figure 3b The head of the single-head bolt in the electrical connection device shown is located on the outside, and the screw portion extends inward and is connected to the linkage mechanism 210. Figure 7a and Figure 7b Both ends of the stud bolt in the electrical connection device shown are screw structures, and the structure connected to the linkage mechanism is also a screw structure, which is the same as the previous embodiment. Similarly, both ends of the insulating transmission member 210 used in this embodiment are connected to the screw portion of the bolt, and both ends of the insulating transmission member 210 can be provided with interfaces matching the shape of the screw, and the screw portion of the bolt is inserted into the interface to achieve linkage. The shape of the screw and the interface is generally polygonal, such as a quadrilateral or hexagonal, and the polygon can prevent the screw from slipping in the interface and reduce the loss of torque during the transmission process.

[0044] As mentioned above, there are many types of electrical devices with a withdrawable structure, including: universal circuit breakers, molded case circuit breakers, automatic transfer switches with drawer devices, medium voltage circuit breakers, medium voltage switch cabinets, etc. The main body busbars in different electrical devices may have different structures. In order to adapt to the main body busbars with different structures, the present invention also proposes various variations. In the electrical connection devices of these variations, there are main body connection components with different structures to adapt to the main body busbars with different structures. Figure 8 and Fig. 9 The structural diagrams of other variations of the electrical connection device that can be used for the interlocking electrical connection assembly of the present invention are disclosed. It should be noted that, for the sake of indirectness of description, the description and illustration of the variations mainly focus on the main body busbars of different structures and the main body connection assemblies that match them. For the remaining universal structures, such as the same structures in the pull-out device connection assembly, the flexible assembly, and the main body connection assembly, no detailed description is made in the specification, and the relevant description can refer to the aforementioned description. Similarly, these universal structures are also simplified in the accompanying drawings, and the structures shown may be different from the corresponding components in the aforementioned two embodiments, but it should be understood that this is a simplification in expression, and the structures of the corresponding components disclosed in the aforementioned embodiments can also be applied to these variations.

[0045] First reference Figure 8 The variation shown, Figure 8 In the variation shown, the main body busbar 408 has a relatively wide dimension, and accordingly, the contact piece 441 also has a relatively wide dimension. When the contact piece 441 and the main body busbar 408 are relatively wide, using only a single bolt and nut cannot ensure that the clamping force can be effectively distributed to the entire contact piece and the main body busbar. Figure 8 In the variation shown, two sets of bolts 442 and nuts 443 are used on the contact piece 441. The two sets of bolts 442 and nuts 443 are arranged side by side, and the structure of each set of bolts and nuts and the corresponding bearing parts, elastic parts and force-applying parts is similar to Figure 3a and 3bThe contact sheet 441 has two screw holes arranged side by side for two bolts 442 to pass through respectively, and two nuts 443 are tightened on the two bolts 442 respectively. Figure 8 In the variation of , a return spring can still be installed on the bolt. Figure 8 In the embodiment shown, there are two U-shaped grooves 481 on the main body busbar 408. The positions of the U-shaped grooves 481 correspond to the positions of the bolts 442. The U-shaped grooves can guide and position the main body busbar when it is inserted between the contact pieces. It should be noted that in the description of the aforementioned embodiment, although it is not mentioned whether the main body busbar is provided with U-shaped grooves, it can be understood that providing U-shaped grooves on the main body busbar is a universal structure and can also be applied to the aforementioned embodiment. Figure 8 In the variation shown, since two sets of bolts are used, two insulating transmission components are also configured accordingly, and each insulating transmission component corresponds to one set of bolts.

[0046] refer to Fig. 9 The variation shown in Fig. 9 In the variation shown, the bolt no longer passes through the contact piece 541 , but instead passes over both sides of the contact piece 541 , and a clamping force is applied to the contact piece 541 using a pressure plate 546 . Fig. 9 The clamping mechanism of the variation shown may include a fastener, a bearing, an elastic member and a force-applying member. The fastener is a bolt and a nut, the bearing is a plane bearing, the elastic member is a disc spring assembly, and the force-applying member is a pressure plate. Fig. 9 As shown, the two pressing plates 546 are respectively attached to the outside of the two contact plates 541 and fixed to the contact plates 541. The pressing plates 546 have screw holes for bolts to pass through, and the bolts 542 pass through the first pressing plate and the second pressing plate in sequence from the outside of the first pressing plate, and the nut is rotatably installed on the second end of the bolt from the outside of the second pressing plate. Fig. 9 In the variation shown, the bolt only passes through the pressure plate and not through the contact piece itself, and the bolt 542 passes over the contact piece 541 from both sides of the contact piece. A plane bearing and a disc spring assembly are installed between the first end of the bolt and the first pressure plate, and the disc spring assembly includes a plurality of disc springs. The bolt and the nut rotate relative to each other and shrink, and the two pressure plates shrink inward, and the disc spring assembly applies a clamping force to the contact piece through the pressure plate. The plane bearing absorbs the relative rotation of the bolt and the nut, so that the disc spring and the pressure plate do not rotate. Fig. 9 A return spring can also be installed on the bolt of the variation shown. The return spring is located between the two pressure plates. When the bolt and the nut rotate relative to each other and expand, the return spring returns to its original position. The return spring applies a spring force to the inner side of the two pressure plates, causing the two contact plates to open outward through the two pressure plates. Fig. 9In the embodiment shown, since the bolts are moved to the outside of the contact pieces, no U-shaped groove is provided on the main body busbar 508. When the bolts do not pass through the contact pieces, the main body busbar 508 can extend deeper between the contact pieces (without being blocked by the bolts). When the main body busbar needs to extend further into the contact pieces, or when the main body busbar is longer, the U-shaped groove can be used. Fig. 9 The structure of the variation shown. Figure 8 Similar, in Fig. 9 In the variation shown, since two sets of bolts are used, two insulating transmission components are also configured accordingly, and each insulating transmission component corresponds to one set of bolts.

[0047] In actual applications, electrical devices such as circuit breakers and switch cabinets are configured in a multi-phase form, and multi-phase connections need to be set at the input and output ends of the electrical devices. For the multi-phase configuration, the present invention also proposes a linkage electrical connection assembly. Fig.10 The structure diagram of the linked electrical connection assembly according to another embodiment of the present invention is disclosed, which is suitable for multi-phase configuration. Fig.10 As shown, the linkage electrical connection assembly includes an electrical connection device and a linkage mechanism. The electrical connection device is connected between the body of the electrical device of the withdrawable structure and the withdrawable device. The electrical device has multiple phases. The electrical connection device includes: a withdrawable device connection assembly 602, several body connection assemblies 604 and a flexible assembly 606. The withdrawable device connection assembly 602 is fixed on the withdrawable device and is electrically connected to the input and output terminals of the withdrawable device. Each of the several body connection assemblies 604 corresponds to one phase of the electrical device. Each body connection assembly 604 includes a contact piece with a clamping mechanism. The clamping mechanism makes the contact piece close to and clamp the body busbar of the phase. The flexible assembly 606 connects the withdrawable device connection assembly 602 and the body connection assembly 604. The body connection assembly 604, the flexible assembly 606 and the withdrawable device connection assembly 602 form a conductive path. In the illustrated embodiment, in order to match the plurality of body connection components 604, a plurality of flexible components 606 are configured accordingly, and each flexible component 606 corresponds to one body connection component 604. The contact pieces of each body connection component 604 are offset to adapt to the positional offset of the corresponding phase body busbar, so that the contact pieces are closely attached to and clamp the body busbar, and the flexible component 606 absorbs the offset of the contact pieces by its own deformation, so that the offset is not transmitted to the withdrawable device connection component 602. Fig.10 In the embodiment shown, each local connection component includes a contact piece, a clamping structure and a reset mechanism. The clamping mechanism is a single-head bolt and a nut. The structure and Figure 3a and Figure 3bThe embodiment shown is similar. The linkage mechanism 610 connects the clamping mechanisms of several body connection components, and the linkage mechanism enables the clamping mechanisms of several body connection components to act synchronously. In this embodiment, since each body connection component is a multi-phase of the same terminal, there is no requirement for insulation between them, and the linkage mechanism 610 does not require insulation. Fig.10 In the embodiment shown, the linkage mechanism 610 can be implemented in one of the following ways: using a single-head bolt with a longer screw rod, the screw rod of which passes through and connects the two local connection components, and the linkage is achieved by the screw rod; or adding a transmission member between the screw rods of the two single-head bolts, and the structure of the transmission member can be similar to the insulating transmission member in the above embodiment. There is no insulation requirement for the rotating member, and it can be conductive or insulating. Since the main function of the transmission member is mechanical linkage, it is also desirable to set it to be insulating, so as to prevent the screw rod from being accidentally caused by conduction.

[0048] Fig.11 A structural diagram of a linked electrical connection assembly according to another embodiment of the present invention is disclosed. Fig.11 The embodiment shown can be considered as Figure 2 and Fig.10 A combination of embodiments. Fig.11 In the embodiment shown, the linked electrical connection assembly includes two electrical connection devices 700 and a linkage mechanism 710 connecting the two electrical connection devices. The two electrical connection devices 700 are respectively connected to the incoming end and the outgoing end of the electrical device. Each electrical connection device 700 itself is a multi-phase electrical connection device, having a plurality of local connection components 704 to correspond to the multi-phase configuration. A linkage mechanism 708 is also provided inside each electrical connection device and between the plurality of local connection components 704. Fig.11 In the embodiment shown, the linkage mechanism 710 is a linkage mechanism between the incoming end and the outgoing end, and there is an insulation requirement, and a similar Figure 2 The linkage mechanism 708 is a linkage mechanism between multiple phases of the same terminal, and has no insulation requirements, and can be implemented by using a similar Fig.10 The linkage mechanism 610 in the illustrated embodiment is implemented with or without insulation.

[0049] Fig.12a and Figure 12b A structural diagram of a linked electrical connection assembly according to another embodiment of the present invention is disclosed. Fig.12a and Figure 12b The linked electrical connection components shown can be considered as Figure 2 A simplified example of the electrical connection assembly of the linkage shown. Fig.12a and Figure 12bIn the embodiment shown, the contact piece 241, the flexible component 206 and the connecting piece 221 of the two electrical connection devices connected by the insulating transmission member 210 are all one piece. Fig.12a In the example shown, both electrical connection devices retain the upper contact piece 241, flexible component 206 and connecting piece 221, while the lower contact piece, flexible component and connecting piece are removed, leaving only a pressing plate 246. Under the action of the clamping mechanism, the upper contact piece and the lower pressing plate clamp the main body busbar together, and the upper contact piece is close to the main body busbar. Figure 12b In the example shown, Fig.12a On the contrary, both electrical connection devices retain the lower contact sheet 241, flexible component 206 and connecting sheet 221, while the upper contact sheet, flexible component and connecting sheet are eliminated, leaving only one pressing plate 246. In addition to using a single contact sheet instead of two contact sheets, the linked electrical connection assembly of this embodiment is Figure 2 The other components of the linked electrical connection assembly of the illustrated embodiment are similar.

[0050] An important function of the linkage electrical connection assembly of the present invention is to solve the contradiction between the insertion and clamping operations. Therefore, the body of the withdrawable structure electrical device applicable to the linkage electrical connection assembly of the present invention and the withdrawable device have two connection states: separation and insertion. Fig.13a and Fig.13b The schematic diagram of the separation position and insertion position of the pull-out structure electrical device applicable to the linked electrical connection assembly of the present invention is disclosed. As shown in the figure, the body 601 of the pull-out structure electrical device and the pull-out device 602 have a separation position and an insertion position. Fig.13a As shown, in the separation position, the body 601 withdraws from the withdrawable device 602, the body busbar 608 is separated from the body connection assembly 604, and the body busbar is not in contact with the contact piece. Fig.13b As shown, in the insertion position, the body 601 is pushed into the withdrawable device 602, the body busbar 608 is inserted into the body connection assembly 604, and then the clamping mechanism is actuated to make the contact piece close to and clamp the body busbar.

[0051] In addition, there is an AC magnetic field in the working environment of the electrical connection device of the present invention. When a material with strong magnetic conductivity is in the AC magnetic field, eddy currents will be induced inside. Especially when a closed magnetic loop is formed, the eddy current loss inside the material with strong magnetic conductivity is very large, resulting in very serious heating, which is also a safety hazard of the electrical device. Fig.14a , Fig.14b and Fig.14c The schematic diagram of the principle of eliminating eddy current loss in the electrical connection device of the linked electrical connection assembly of the present invention is disclosed. Fig.14a , Fig.14b and Fig.14cAs shown, an alternating magnetic field loop B (i.e., an alternating magnetic field) is generated around the AC current I passing through. If the pull-out device connection component and the main body connection component are made of strong magnetic conductive materials as a whole, a vortex-shaped induced current i will be formed on the pull-out device connection component and the main body connection component under the action of the alternating magnetic field. The induced current i generates a large eddy current loss, resulting in serious heating. Therefore, in situations where a large current passes through, it is necessary to use non-magnetic conductive materials in at least one section of the magnetic loop generated by it to prevent the formation of a closed magnetic loop, thereby avoiding or greatly reducing the induced current i generated by the power frequency AC current, reducing eddy current losses and heat generation. Therefore, in an embodiment of the present invention, the pull-out device connection component and the main body connection component contain non-magnetic conductive materials to prevent the formation of a closed magnetic loop. Non-magnetic conductive materials can be used to constitute components such as pads, fixed brackets, and pressure plates.

[0052] The electrical connection device of the present invention solves the contradiction between the insertion and clamping operations from a structural point of view. 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 terminal and the output terminal 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.

[0053] According to the present invention, when the main body busbar is inserted into the electrical connection device, it can be achieved that there is no mutual force between the main body busbar and the electrical connection device, such as the force of the contact piece to open the contact piece in the prior art, and the friction between the main body busbar and the contact piece. The driving device of the pull-out device can push the main body of the electrical device with a very small force, so that the main body busbar is inserted into the electrical connection device.

[0054] The electrical connection device can be configured with a large clamping force to clamp the main busbar as needed, so that the overall contact resistance of the electrical device is greatly reduced, especially in long-term use, the power consumption is greatly reduced, and the use cost is greatly saved. The higher the rated current of the electrical device, the more significant this advantage is. On the other hand, the reduction of contact resistance reduces the temperature rise of the product and the heat generation of the electrical device. There is no need to consider a large heat dissipation space, which is conducive to reducing the size of the product and improving the reliability of long-term use.

[0055] In addition to providing a larger clamping force, the presence of the elastic member also absorbs the deviation of the clamping stroke between the two electrical connection devices, so that after synchronous action, the difference in the clamping force of the two electrical connection devices is very small and both maintain a larger clamping force.

[0056] The above embodiments are provided for persons familiar with the art to implement or use the present invention. Personnel familiar with the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope 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 linked electrical connection assembly, comprising two electrical connection devices and a linkage mechanism connecting the two electrical connection devices, It is characterized in that Two electrical connection devices are connected between the main body of the withdrawable electrical device and the withdrawable device, and the two electrical connection devices are respectively connected to the incoming line end and the outgoing line end of the electrical device, and the electrical connection devices include: A withdrawable device connection assembly, the withdrawable device connection assembly is fixed to the withdrawable device and is electrically connected to the input and output terminals of the withdrawable device; A body connection assembly, the body connection assembly includes at least one set of clamping mechanisms, a reset mechanism and contact sheets, each set of contact sheets includes two contact sheets, fasteners are installed on the two contact sheets, the clamping mechanism applies a clamping force from the outside of the two contact sheets through the fasteners so that the two contact sheets are closely attached to and clamp the body busbar from both sides, and the reset mechanism applies a reset force from the inside of the two contact sheets so that the two contact sheets are opened outwards to reset; A flexible component, the flexible component connects the withdrawable device connection component and the main body connection component, the main body connection component, the flexible component and the withdrawable device connection component form a conductive path, the contact sheet is connected to the flexible component, and the flexible component is formed by multiple layers of copper foil, multiple layers of copper tape or copper braided wire; The contact piece of the body connection component is offset to adapt to the positional offset of the body busbar, so that the contact piece is closely attached to and clamps the body busbar, and the flexible component absorbs the offset of the contact piece by its own deformation, so that the offset is not transmitted to the withdrawable device connection component; The linkage mechanism connects the clamping mechanisms of the two electrical connection devices, and the linkage mechanism enables the clamping mechanisms of the two electrical connection devices to act synchronously.

2. The linked electrical connection assembly as claimed in claim 1, It is characterized in that The clamping mechanism comprises: the fastener, the bearing member, the elastic member and the force applying member; The fastener is installed on the contact piece, and when the fastener is tightened, the contact piece shrinks inwards; The elastic member and the force applying member apply a clamping force to the contact piece; The bearing member is installed between the fastener and the elastic member, and the bearing member 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.

3. The linked electrical connection assembly as claimed in claim 2, It is characterized in that 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.

4. The linked electrical connection assembly as claimed in claim 2, It is characterized in that The fasteners are bolts and nuts, the bearing member is a plane bearing, the elastic member is a disc spring assembly, and the force-applying member is a pressure plate; The contact sheet is provided with a screw hole for a bolt to pass through, the bolt passes through the first contact sheet and the second contact sheet in sequence from the outside of the first contact sheet, and the nut is rotatably installed on the second end of the bolt from the outside of the second contact sheet; A plane bearing, a disc spring assembly and a pressure plate are arranged between the first end of the bolt and the first contact piece, and the disc spring assembly includes a plurality of disc springs; The bolt and nut rotate relative to each other and shrink, the two contact pieces shrink inward, and the disc spring assembly and the pressure plate apply clamping force to the contact pieces; The plane bearing absorbs the relative rotation of the bolt and the nut, so that the disc spring and the pressure plate do not rotate.

5. The linked electrical connection assembly as claimed in claim 4, It is characterized in that The linkage mechanism is an insulating transmission member, and both ends of the insulating transmission member are provided with interfaces, and the interfaces at both ends are respectively connected to the bolts of the two electrical connection devices, so that the bolts of the two electrical connection devices rotate synchronously.

6. The linked electrical connection assembly as claimed in claim 2, It is characterized in that The fasteners are bolts and nuts, the bearing member is a plane bearing, the elastic member is a disc spring assembly, and the force-applying member is a pressure plate; The two pressing plates are respectively closely attached to the outer sides of the two contact plates and are respectively fixed to the contact plates. The pressing plates are provided with screw holes for bolts to pass through. The bolts pass through the first pressing plate and the second pressing plate in sequence from the outer side of the first pressing plate. The nuts are rotatably installed on the second ends of the bolts from the outer side of the second pressing plate. A plane bearing and a disc spring assembly are installed between the first end of the bolt and the first pressure plate, and the disc spring assembly includes a plurality of disc springs; The bolt and nut rotate relative to each other and shrink, the two pressure plates shrink inward, and the disc spring assembly applies a clamping force to the contact piece through the pressure plate; The plane bearing absorbs the relative rotation of the bolt and the nut, so that the disc spring and the pressure plate do not rotate.

7. The linked electrical connection assembly as claimed in claim 6, It is characterized in that The linkage mechanism is an insulating transmission member, and both ends of the insulating transmission member are provided with interfaces, and the interfaces at both ends are respectively connected to the bolts of the two electrical connection devices, so that the bolts of the two electrical connection devices rotate synchronously.

8. The linked electrical connection assembly according to claim 4 or 6, It is characterized in that The reset mechanism is a reset spring, which is installed on the bolt and located between the two contact pieces or the two pressure plates. The bolt and the nut rotate relative to each other and contract, and the reset spring is compressed. The bolt and the nut rotate relative to each other and expand, and the reset spring recovers. The reset spring applies spring force to the inner sides of the two contact pieces or the two pressure plates, so that the two contact pieces open outward.

9. A linked electrical connection assembly, comprising an electrical connection device and a linkage mechanism, It is characterized in that The electrical connection device is connected between the body of the withdrawable electrical device and the withdrawable device, the electrical device has multiple phases, and the electrical connection device includes: A withdrawable device connection assembly, the withdrawable device connection assembly is fixed to the withdrawable device and is electrically connected to the input and output terminals of the withdrawable device; A plurality of body connection components, each of which corresponds to one phase of the electrical device, each of which includes a group of contact pieces with a clamping mechanism and a reset mechanism, each group of contact pieces with a clamping mechanism and a reset mechanism includes two contact pieces, fasteners are installed on the two contact pieces, the clamping mechanism applies a clamping force from the outside of the two contact pieces through the fasteners so that the two contact pieces are closely attached to and clamp the body busbar of the phase from both sides, and the reset mechanism applies a reset force from the inside of the two contact pieces so that the two contact pieces are opened outwards to reset; A flexible component, wherein the flexible component connects the withdrawable device connection component and the main body connection component, the main body connection component, the flexible component and the withdrawable device connection component form a conductive path, and the flexible component is formed by multiple layers of copper foil, multiple layers of copper tape or copper braided wire; The contact piece of the body connection component is offset to adapt to the positional offset of the body busbar, so that the contact piece is closely attached to and clamps the body busbar, and the flexible component absorbs the offset of the contact piece by its own deformation, so that the offset is not transmitted to the withdrawable device connection component; The linkage mechanism connects the clamping mechanisms of several body connection components, and the linkage mechanism enables the clamping mechanisms of several body connection components to act synchronously.

10. An electrical device with a withdrawable structure, comprising a body and a withdrawable device, wherein the body and the withdrawable device have a separation position and an insertion position, It is characterized in that The body and the withdrawable device are connected by a linked electrical connection assembly as claimed in claim 1 or 9, wherein: In the separation position, the body exits the withdrawable device, the body busbar is separated from the body connection assembly, and the body busbar is not in contact with the contact piece; In the insertion position, the body is pushed into the withdrawable device, the body busbar is inserted into the body connection assembly, and the contact piece is pressed against and clamped to the body busbar.

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