Moving contact group of circuit breaker

Abstract

The utility model provides a moving contact group of a circuit breaker. The moving contact group comprises a contact piece, a connector bar and a flexible connector. One end of the flexible connector is fixedly conducted with the contact piece, and the other end of the flexible connector is fixedly conducted with the line bank. The line bank is fixed on the circuit breaker, and the contact piece is rotatably installed in the circuit breaker. The flexible connections are divided into two or more groups. And one ends of the two or more groups of flexible connections are fixed together with the contact piece. And the other ends of the two or more groups of flexible connections are respectively contacted, fixed and conducted through different electric connection surfaces on the line bank so as to be electrically connected with the line bank. A plurality of electric connection surfaces are arranged in different directions of one end, used for flexible connection and fixation, of the line bank, so that two or more groups of flexible connections can be fixedly and electrically connected with the line bank through a larger contact surface, and the moving contact group of the circuit breaker is good in contact, temperature rise in operation and safer and more reliable.

Description

Technical Field

[0001] This invention relates to low-voltage circuit breakers, and more particularly to the moving contact assembly of circuit breakers. Background Technology

[0002] In low-voltage circuit breakers, to achieve both conduction and isolation of the conductive circuit, a movable contact assembly is typically installed inside the circuit breaker. The movement of this moving contact assembly allows for contact and separation with the stationary contact, thus achieving the purpose of conducting and isolating the conductive circuit. To ensure the moving contact assembly has good conductivity and can move flexibly within the circuit breaker, a flexible connection is generally used. One end of the flexible connection is fastened or welded to the movable contact piece, and the other end is fastened or welded to the terminal block fixed to the circuit breaker. This achieves both conduction between the contact piece and the terminal block, and also allows the contact piece to move flexibly within the circuit breaker. In existing technologies, the fastening or welding of the flexible connection to the terminal block is often achieved on a single electrical connection surface in a fixed direction on the terminal block, and this electrical connection surface often has a small contact area with the flexible connection. For example... Figure 3 , 4 As shown, the existing flexible connection 2x can only be fastened through the electrical connection surface 4022x on the terminal block 4x. When a large current flows through the moving contact group, the current can only flow from the terminal block 4x, through the electrical connection surface 4022x with a width of L2, to the flexible connection 2x, and then into the contact piece 5x. Figure 4 The width of terminal block 4x is B. Therefore, the electrical contact area between flexible connector 2x and terminal block 4x is Sx = L² * B. Because the electrical contact surface 4022x is located on the narrower surface of terminal block 4x, current will accumulate at this point, leading to high heat generation and a higher operating temperature rise. This makes the circuit breaker more susceptible to copper oxidation and insulation aging, shortening its service life. Furthermore, due to electromagnetic effects, an electrodynamic repulsive force is generated between the contact surfaces of the flexible connector and the terminal block through which the current flows, causing them to tend to separate. The magnitude of this electrodynamic repulsive force is proportional to the square of the current value. Figure 4 The current flowing into the terminal block and into the flexible connector 2x via electrical connection surface 4022x is both I. Therefore, the electrodynamic repulsion force Fx = I * I * K. Here, K is an empirical parameter, and it is a constant for a specific connection type. When current concentrates through a single electrical connection surface, it generates a large electrodynamic repulsion force between the contact surface of the flexible connector and the terminal block, easily causing poor contact and posing a safety hazard. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a circuit breaker moving contact assembly with a large contact surface between the flexible connection and the terminal block, so as to overcome the problems of high heat generation, high operating temperature rise, easy poor contact, and easy safety hazards caused by the small contact surface between the flexible connection and the terminal block in the prior art.

[0004] To achieve the above objectives, this invention designs a circuit breaker moving contact assembly, including a contact piece, a terminal block, and a flexible connection. One end of the flexible connection is fixedly connected to the contact piece, and the other end of the flexible connection is fixedly connected to the terminal block. The terminal block is fixed to the circuit breaker, and the contact piece is rotatably installed inside the circuit breaker. The flexible connection is divided into two or more groups. One end of each of the two or more groups of flexible connections is fixedly connected to the contact piece. The other ends of each of the two or more groups of flexible connections are respectively fixedly connected to the terminal block via different electrical connection surfaces, thereby electrically connecting to the terminal block.

[0005] Furthermore, a contact section is provided on the side of the terminal block facing the flexible connection, and a connection section is provided on the other side of the terminal block. The contact section has two or more electrical connection surfaces.

[0006] Furthermore, the flexible connector has an electrical connection segment on the side facing the terminal block, and a contact segment on the other side. The electrical connection segments of the two or more sets of flexible connectors respectively contact and fix the electrical connection with the corresponding electrical connection surfaces on the terminal block.

[0007] Furthermore, a flexible connection segment is provided on the side of the contact piece facing the flexible connection, and a contact segment is provided on the other side of the contact piece. The flexible connection segment is fixedly electrically connected to the contact segments of the two or more sets of flexible connections.

[0008] The technical advantage of this invention is that by setting multiple electrical connection surfaces in different directions at one end of the terminal block used for fixing flexible connections, two or more sets of flexible connections can be fixedly electrically connected to the terminal block through a larger contact surface, resulting in good contact of the circuit breaker moving contact group, reduced operating temperature rise, and greater safety and reliability. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the first embodiment of a circuit breaker moving contact assembly according to the present invention.

[0010] Figure 2 This is a schematic diagram showing the disassembled structure of the first embodiment of the moving contact assembly of a circuit breaker according to the present invention.

[0011] Figure 3 This is a structural schematic diagram of the moving contact assembly of a circuit breaker based on existing technology.

[0012] Figure 4 This is a schematic diagram of the disassembled structure of the moving contact assembly of a circuit breaker based on existing technology.

[0013] Figure 5 This is a schematic diagram of the structure of the second embodiment of a circuit breaker moving contact assembly according to the present invention.

[0014] Figure 6 This is a schematic diagram showing the disassembled structure of the second embodiment of the moving contact assembly of a circuit breaker according to the present invention.

[0015] Figure 7 This is a structural schematic diagram of the third embodiment of a circuit breaker moving contact assembly according to the present invention.

[0016] Figure 8 This is a schematic diagram showing the disassembled structure of the third embodiment of the moving contact assembly of a circuit breaker according to the present invention.

[0017] Figure 9 This is a schematic diagram of the fourth embodiment of a circuit breaker moving contact assembly according to the present invention.

[0018] Figure 10 This is a schematic diagram showing the disassembled structure of the fourth embodiment of the moving contact assembly of a circuit breaker according to the present invention.

[0019] Figure 11 This is a structural schematic diagram of the fifth embodiment of a circuit breaker moving contact assembly according to the present invention.

[0020] Figure 12 This is a schematic diagram showing the disassembled structure of the fifth embodiment of the moving contact assembly of a circuit breaker according to the present invention.

[0021] Figure 13 This is a schematic diagram of the sixth embodiment of a circuit breaker moving contact assembly according to the present invention.

[0022] Figure 14 This is a schematic diagram of the prior art corresponding to the sixth embodiment of the moving contact assembly of a circuit breaker involved in this invention. Detailed Implementation

[0023] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0024] Marker explanation:

[0025] First soft connections 1, 1a, 1b, 1d; first contact segments 101, 101a, 101b, 101d; first electrical connection segments 102, 102a, 102b, 102d; first connecting holes 103, 103a, 103b, 103d.

[0026] Second flexible connections 2, 2x, 2a, 2c; second contact segments 201, 201x, 201a, 201c; second electrical connection segments 202, 202x, 202a, 202c; second connecting holes 203, 203x, 203a, 203c.

[0027] Third soft connections 3, 3b, 3c, 3d; third contact segments 301, 301b, 301c, 301d; third electrical connection segments 302, 302b, 302c, 302d; third connecting holes 303, 303b, 303c, 303d.

[0028] Terminal blocks 4, 4x, 4a, 4b, 4c, 4d; connecting sections 401, 401a, 401b, 401c, 401d; contact sections 402, 402a, 402b, 402c, 402d; first electrical connection surfaces 4021, 4021a, 4021b, 4021d; second electrical connection surfaces 4022, 4022x, 4022a, 4022c; third electrical connection surfaces 4023, 4023b, 4023c, 4023d; first-direction fastening holes 403, 403a, 403b, 403c, 403d; second-direction fastening holes 404, 404a, 404c.

[0029] Contact pieces 5, 5x, 5a, 5b, 5c, 5d; flexible connection segments 501, 501x, 501a, 501b, 501c, 501d; contact segments 502, 502a, 502b, 502c, 502d; rotating holes 503, 503x, 503a, 503b, 503c, 503d; flexible connection slots 504, 504x, 504a, 504b, 504c, 504d; contact slot 505.

[0030] First pressure plates 6, 6a, 6b, 6c, 6e; first clamping sections 601, 601a, 601b, 601c; first mounting sections 602, 602a, 602b, 602c; first support sections 603, 603a, 603b, 603c; first connecting holes 604, 604a, 604b, 604c; first mounting holes 605, 605a, 605b, 605c.

[0031] Second pressure plates 7, 7x, 7a, 7c; second clamping sections 701, 701a, 701c; second support sections 703, 703a, 703c; second connecting holes 704, 704a, 704c.

[0032] Third pressure plates 8, 8a, 8b, 8c, 8d; second clamping sections 801, 801a, 801b, 801c, 801d; second mounting sections 802, 802a, 802b, 802c; second support sections 803, 803a, 803b, 803c, 803d; third connecting holes 804, 804a, 804b, 804c, 804d; second mounting holes 805, 805a, 805b, 805c.

[0033] First direction fastening group 9, 9x, 9a, 9b, 9c, 9d,

[0034] Second direction fastening group 10, 10x, 10a, 10c.

[0035] Figure 1 and Figure 2 As shown, this is a first embodiment of a circuit breaker moving contact assembly of the present invention, including a contact piece 5, a terminal block 4, a first flexible connection 1, a second flexible connection 2, a third flexible connection 3, a first pressure plate 6, a second pressure plate 7, a third pressure plate 8, a first directional fastening group 9, and a second directional fastening group 10.

[0036] The contact piece 5 has a flexible connection section 501 facing the flexible connection 4. The end of the flexible connection section 501 has a recessed flexible connection groove 504 for fixing to the flexible connection. The fixing method can be welding, screw fastening, etc.; this example uses welding. A contact segment 502 is provided on the other side of the contact piece 5. The contact segment 502 has a contact groove 505 for fixing the contacts. The contact piece 4 also has a rotating hole 503 for rotatably mounting the contact piece 4 inside the circuit breaker. Other circuit breaker structures are not shown in this invention. To carry a larger current, the moving contact group uses multiple contact pieces 5; the larger the rated current of the product, the more contact pieces 5 are used. Multiple contact pieces 5 are parallel and aligned through the rotating hole 503, and are rotatably mounted inside the circuit breaker.

[0037] A first electrical connection segment 102 is provided on the side of the first flexible connector 1 facing the terminal block 4 for fixed electrical connection with the terminal block 4. The first electrical connection segment 102 has a flat structure to facilitate full contact and fit with the terminal block 4. The fixing method can be welding, screw fastening, etc. In this example, screw fastening is used, so the first electrical connection segment 102 is also provided with a first connection hole 103 for fastening the first flexible connector 1 to the terminal block 4. A first contact segment 101 is provided on the other side of the first flexible connector 1. The first contact segment 101 is a segment structure that is separated from each other, and each segment structure corresponds to a contact piece 4. Each segment structure can operate independently.

[0038] A second electrical connection segment 202 is provided on the side of the second flexible connector 2 facing the terminal block 4 for fixed electrical connection with the terminal block 4. The second electrical connection segment 202 has a flat structure to facilitate full contact and fit with the terminal block 4. The fixing method can be welding, screw fastening, etc. In this example, screw fastening is used, so the second electrical connection segment 202 is also provided with a second connection hole 203 for fastening the second flexible connector 2 to the terminal block 4. A second contact segment 201 is provided on the other side of the second flexible connector 2. The second contact segment 201 is a segment structure that is separated from each other, each segment structure corresponds to one contact piece 4, and each segment structure can operate independently.

[0039] The third flexible connector 3 has a third electrical connection segment 302 on the side facing the terminal block 4 for fixed electrical connection with the terminal block 4. The third electrical connection segment 302 has a flat structure to facilitate full contact and fit with the terminal block 4. The fixing method can be welding, screw fastening, etc. In this example, screw fastening is used, so the third electrical connection segment 302 is also provided with a third connection hole 303 for fastening the third flexible connector 3 to the terminal block 4. The other side of the third flexible connector 3 has a third contact segment 301. The third contact segment 301 is a segment structure that is separated from each other, each segment structure corresponds to a contact piece 4, and each segment structure can operate independently.

[0040] The terminal block 4 has a contact section 402 facing the flexible connection. A first electrical connection surface 4021 with a width of L1 is provided on the upper side of the contact section 402 for fixed electrical connection with the first flexible connection 1. The width L1 can be flexibly adjusted according to the performance requirements of the product. When better conductivity of the moving contact group is required, a larger width L1 can be obtained, and the corresponding number of consumables will increase accordingly. A second electrical connection surface 4022 with a width of L2 is provided on the rear side of the contact section 402 for fixed electrical connection with the second flexible connection 2. The maximum value of the width L2 is the thickness of the terminal block 4. Since traditional technical solutions often use the second electrical connection surface 4022 for fixed electrical connection, its contact area is limited. A third electrical connection surface 4023 with a width of L3 is provided on the lower side of the contact section 402 for fixed electrical connection with the third flexible connection 3. The width L3 can be flexibly adjusted according to the performance requirements of the product. When better conductivity of the moving contact group is required, a larger width L3 can be obtained, and the corresponding number of consumables will increase accordingly. Since this embodiment uses screw fastening, fastening holes are provided on each electrical connection surface for fastening. Because the first electrical connection surface 4021 and the third electrical connection surface 4023 are positioned opposite each other, a first-direction fastening hole 403 is provided in the direction perpendicular to the first electrical connection surface 4021 and the third electrical connection surface 4023. The first-direction fastening hole 403 is a through hole. A second-direction fastening hole 404 is provided in the direction perpendicular to the second electrical connection surface 4022. If welding is used, fastening holes are not required, nor are pressure plates and fastening assemblies needed. A connecting section 401 is provided on the other side of the terminal block 4. The connecting section 401 is used for electrical connection between the circuit breaker and the power distribution network.

[0041] The first electrical connection segment 102 of the first flexible connection 1, the second electrical connection segment 202 of the second flexible connection 2, and the third electrical connection segment 302 of the third flexible connection 3 are all placed in the flexible connection groove 504 of the contact piece 4 and are fixedly connected to the contact piece 4.

[0042] A first clamping section 601 is provided on the first pressure plate 6 facing the first electrical connection surface 4021. The first clamping section 601 has a first connecting hole 604. The first connecting hole 604 is a through hole. The position of the first connecting hole 604 corresponds to and couples with the first direction fastening hole 403. The first clamping section 601 is located above the first electrical connection section 102 of the first flexible connection 1, contacting and firmly clamping it, so that the first electrical connection section 102 and the contact section 402 can reliably contact and connect. The first pressure plate 6 is bent towards the connecting section 401 to form a first mounting section 602. The first mounting section 602 has a first mounting hole 605 for mounting and fixing the moving contact assembly on the circuit breaker. The first pressure plate 6 is bent towards the first flexible connection 1 to form a first support section 603 with rounded corners, for supporting and protecting the first flexible connection 1 that moves with the contact piece 4.

[0043] The second pressure plate 7 is provided with a second clamping section 701 facing the second electrical connection surface 4022. The second clamping section 701 is provided with a second connecting hole 704. The second connecting hole 704 is a through hole. The position of the second connecting hole 704 corresponds to and couples with the second direction fastening hole 404. The second clamping section 701 is located behind the second electrical connection section 202 of the second flexible connection 2, contacting and clamping it tightly, so that the second electrical connection section 202 and the contact section 402 can reliably make contact and make electrical connection. The second pressure plate 7 is bent towards the second flexible connection 2 to form a second support section 703 with rounded corners, which is used to support and protect the second flexible connection 2 that moves with the contact piece 4.

[0044] The third pressure plate 8 is provided with a third clamping section 801 facing the third electrical connection surface 4023. The third clamping section 801 is provided with a third connecting hole 804. The third connecting hole 804 is a through hole. The position of the third connecting hole 804 corresponds to and couples with the first direction fastening hole 403. The third clamping section 801 is located below the third electrical connection section 302 of the third flexible connection 3, contacting and clamping it tightly, so that the third electrical connection section 302 and the contact section 402 can reliably contact and connect. The third pressure plate 8 is bent towards the connecting section 401 to form a third mounting section 802. The third mounting section 802 is provided with a third mounting hole 805 for mounting and fixing the moving contact assembly on the circuit breaker. The third pressure plate 8 is bent towards the third flexible connection 3 to form a third support section 803 with rounded corners, for supporting and protecting the third flexible connection 3 that moves with the contact piece 4.

[0045] Figure 2 As shown, during installation, the second directional fastening assembly 10 passes sequentially through the second clamping section 701 and the second electrical connection section 202, and is fastened to the terminal block 4, thus achieving a secure electrical connection between the second flexible connection 2 and the terminal block 4. The first directional fastening assembly 9 passes sequentially through the first clamping section 601, the first electrical connection section 102, the terminal block 4, the third electrical connection section 302, and the third clamping section 801, thus achieving a secure electrical connection between the first flexible connection 1, the third flexible connection 3, and the terminal block 4.

[0046] Figure 1As shown in the figure, when the circuit breaker is powered on, current I enters the terminal block 4 and divides into three branch circuits of currents I1, I2, and I3, and enters the contact piece 5 through the first flexible connection 1, the second flexible connection 2, and the third flexible connection 3 respectively. The width of the terminal block 4 is B, and the electrical contact area of the first flexible connection 1, the second flexible connection 2, and the third flexible connection 3 with the terminal block 4 is S1 = (L1 + L2 + L3) * B > Sx = L2 * B. Therefore, the electrical contact area of the first embodiment of the present invention is much larger than that of the prior art, and better contact resistance and lower operating temperature rise can be obtained. Assuming I1 = I2 = I3, then I1 = I2 = I3 = 1 / 3 * I, and the electro-dynamic repulsive force generated by the current between the contact surfaces is F1 = I1 * I1 * K + I2 * I2 * K + I3 * I3 * K = 1 / 3 * I * I * K < Fx = I * I * K. Therefore, the electro-dynamic repulsive force of the first embodiment of the present invention is much smaller than that of the prior art, the contact is better, and it is safer and more reliable. When the currents I1, I2, and I3 are not equal, the generated electro-dynamic repulsive force is greater than 1 / 3 * I * I * K, but still less than Fx = I * I * K of the prior art.

[0047] Figure 5 and Figure 6 As shown in the figure, a second embodiment of a moving contact group of a circuit breaker according to the present invention is provided. The difference between the second embodiment and the first embodiment is that only the first flexible connection 1a and the second flexible connection 2a are fixedly electrically connected to the terminal block 4a. The upper side of the contact section 402a of the terminal block ........ Figure 6 As shown in the figure, during installation, the second-direction fastening group 10a sequentially passes through the second pressing section 701a and the second electrical connection section 202a and is fastened to the terminal block 4a to achieve the fastened electrical connection between the second flexible connection 2a and the terminal block 4a. The first-direction fastening group 9a sequentially passes through the first pressing section 601a, the first electrical connection section 102a, the terminal block Figure 5 Figure 5As shown in the figure, when the circuit breaker is powered on, current I enters the terminal block 4a and divides into two branch circuits of current I1 and I2, and enters the contact piece 5a through the first flexible connection 1a and the second flexible connection 2a respectively. The width of the terminal block 4a is B, then the electrical contact area of the first flexible connection 1a and the second flexible connection 2a with the terminal block 4a is S2 = (L1 + L2) * B > Sx = L2 * B. Therefore, the electrical contact area of the second embodiment of the present invention is much larger than that of the prior art, and better contact resistance and lower operating temperature rise can be obtained. Assuming I1 = I2, then I1 = I2 = 1 / 2 * I, and the electro-dynamic repulsive force generated by the current between the contact surfaces is F2 = I1 * I1 * K + I2 * I2 * K = 1 / 2 * I * I * K < Fx = I * I * K. Therefore, the electro-dynamic repulsive force of the second embodiment of the present invention is much smaller than that of the prior art, the contact is better, and it is safer and more reliable. When the currents I1 and I2 are not equal, the generated electro-dynamic repulsive force is greater than 1 / 2 * I * I * K, but still less than Fx = I * I * K of the prior art.

[0048] Figure 7 and Figure 8 As shown in the figure, a third embodiment of the moving contact group of the circuit breaker according to the present invention is shown. The difference between the third embodiment and the first embodiment is that only the first flexible connection 1b and the third flexible connection 3b are fixedly electrically connected to the terminal block 4b. On the upper side of the contact section 402b of the terminal block 4b, a first electrical connection surface 4021b with a width of L1 is provided for fixedly electrically connecting with the first flexible connection 1b. On the lower side of the contact section 402b, a third electrical connection surface 4023b with a width of L3 is provided for fixedly electrically connecting with the third flexible connection 3b. As Figure 8 shown in the figure, during installation, the first direction fastening group 9b passes through the first pressing section 601b, the first electrical connection section 102b, the terminal block 4b, the third electrical connection section 302b, and the third pressing section 801b in sequence for fastening, so as to realize the fastening electrical connection of the first flexible connection 1b and the third flexible connection 3b with the terminal block 4. As Figure 7As shown in the figure, when the circuit breaker is powered on and working, the current I enters the wiring terminal 4b, and is divided into two branch circuits of current I1 and I3, and enters the contact piece 5b through the first flexible connection 1b and the third flexible connection 3b respectively. The width of the wiring terminal 4b is B, then the electrical contact area of the first flexible connection 1b and the third flexible connection 3b with the wiring terminal 4b is S3 = (L1 + L3) * B > Sx = L2 * B. Therefore, the electrical contact area of the third embodiment of the present invention is much larger than that of the prior art, and better contact resistance and lower operating temperature rise can be obtained. Assuming I1 = I3, then I1 = I3 = 1 / 2 * I, and the electrodynamic repulsive force generated by the current between the contact surfaces is F3 = I1 * I1 * K + I3 * I3 * K = 1 / 2 * I * I * K < Fx = I * I * K. Therefore, the electrodynamic repulsive force of the third embodiment of the present invention is much smaller than that of the prior art, the contact is better, and it is safer and more reliable. When the currents I1 and I3 are not equal, the generated electrodynamic repulsive force is greater than 1 / 2 * I * I * K, but still less than Fx = I * I * K of the prior art.

[0049] Figure 9 and Figure 10 As shown in the figure, it is the fourth embodiment of a moving contact group of a circuit breaker according to the present invention. The difference between the fourth embodiment and the first embodiment is that only the second flexible connection 2c and the third flexible connection 3c are fixedly electrically connected to the wiring terminal 4c. On the upper side of the contact section 402c of the wiring terminal 4c, a third electrical connection surface 4023c with a width of L3 is provided for fixedly electrically connecting with the third flexible connection 3c. On the rear side of the contact section 402c, a second electrical connection surface 4022c with a width of L2 is provided for fixedly electrically connecting with the second flexible connection 2c. The maximum value of the width L2 is the thickness of the wiring terminal 4c. As Figure 10 As shown in the figure, during installation, the second-direction fastening group 10c sequentially passes through the second pressing section 701c and the second electrical connection section 202c, and is fastened to the wiring terminal 4c to realize the fastened electrical connection between the second flexible connection 2c and the wiring terminal 4c. The first-direction fastening group 9c sequentially passes through the first pressing section 601c, the wiring terminal 4c, the third electrical connection section 302c, and the third pressing section 801c and is fastened to realize the fastened electrical connection between the third flexible connection 3c and the wiring terminal 4c. As Figure 9As shown in the figure, when the circuit breaker is powered on and working, the current I enters the terminal block 4c, and is divided into two branch circuits of current I2 and I3, and enters the contact piece 5c through the second flexible connection 2c and the third flexible connection 3c respectively. The width of the terminal block 4c is B, then the electrical contact area between the second flexible connection 2c, the third flexible connection 3c and the terminal block 4c is S3=(L2 + L3)*B > Sx = L2*B. Therefore, the electrical contact area of the 4th embodiment of the present invention is much larger than that of the prior art, and better contact resistance and lower operating temperature rise can be obtained. Assuming I2 = I3, then I2 = I3 = 1 / 2*I, and the electro-dynamic repulsive force generated by the current between the contact surfaces is F3 = I3*I3*K + I2*I2*K = 1 / 2*I*I*K < Fx = I*I*K. Therefore, the electro-dynamic repulsive force of the 4th embodiment of the present invention is much smaller than that of the prior art, the contact is better, and it is safer and more reliable. When the currents I2 and I3 are not equal, the generated electro-dynamic repulsive force is greater than 1 / 2*I*I*K, but still less than Fx = I*I*K of the prior art.

[0050] Figure 11 and Figure 12 As shown in the figure, it is the 5th embodiment of a moving contact group of a circuit breaker according to the present invention. The difference between the 5th embodiment and the 3rd embodiment is that, for the convenience of the fixed electrical connection between the flexible connection and the terminal block 4d, the contact section 402d of the terminal block 4d and the connection section 401d are arranged at a certain angle. The first direction fastening group 9d passes through the third pressing section 801d, the third electrical connection section 302d, the terminal block 4d, and the first electrical connection section 102d in sequence for fastening, so as to realize the fastening electrical connection between the first flexible connection 1d, the third flexible connection 3d and the terminal block 4d. The electrical contact area between the first flexible connection 1d, the third flexible connection 3d and the terminal block 4d of the 5th embodiment is S5=(L1 + L3)*B > Sx = L2*B, which is similar to S3 of the 3rd embodiment. Assuming I2 = I3, then I2 = I3 = 1 / 2*I, and the electro-dynamic repulsive force F5 = I1*I1*K + I3*I3*K = 1 / 2*I*I*K < Fx = I*I*K generated by the current of the 5th embodiment between the contact surfaces is similar to F3 of the 3rd embodiment.

[0051] Figure 13 As shown in the figure, it is the 6th embodiment of a moving contact group of a circuit breaker according to the present invention, and the principle of the fixed electrical connection between the flexible connection and the terminal block is similar to that of the 5th embodiment. The difference between the 6th embodiment and the 5th embodiment is that, on the basis of the 5th embodiment, the 6th embodiment adds a first pressing plate 6e for fixing and installing the moving contact group on the circuit breaker. Figure 14 As shown in the figure, it is the prior art solution corresponding to the 6th embodiment. The difference between it and the 6th embodiment is that only one group of flexible connections and terminal blocks are fixedly electrically connected on one electrical connection surface, or two groups of flexible connections are stacked together and fixedly electrically connected with the terminal block on one electrical connection surface.

[0052] Comparing the electrical contact area and electro-repulsive force between the flexible connection and terminal block in the five embodiments of the present invention with the existing technology, the first embodiment is optimal; the second, third, fourth and fifth embodiments are similar but inferior to the first embodiment, but all are superior to the existing technology.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A circuit breaker moving contact assembly, comprising contact plates, terminal blocks, and flexible connections; One end of the flexible connector is fixedly connected to the contact piece, and the other end of the flexible connector is fixedly connected to the terminal block. The terminal block is fixed to the circuit breaker, and the contact piece is rotatably installed inside the circuit breaker; Its features are, The flexible connections are divided into two or more groups; One end of each of the two or more sets of flexible connections is fixed together with the contact piece; The other ends of the two or more sets of flexible connections are respectively connected to the terminal block by contacting and fixing different electrical connection surfaces on the terminal block, thereby electrically connecting to the terminal block.

2. The circuit breaker moving contact assembly according to claim 1, characterized in that, The terminal block has a contact section on the side facing the flexible connection, and a connection section on the other side of the terminal block; The contact section is provided with two or more electrical connection surfaces.

3. A circuit breaker moving contact assembly according to claim 1, characterized in that, The flexible connector has an electrical connection segment on the side facing the terminal block, and a contact segment on the other side of the flexible connector; The electrical connection segments of the two or more sets of flexible connections are respectively contacted and fixed with the corresponding electrical connection surfaces on the terminal block.

4. A circuit breaker moving contact assembly according to claim 1, characterized in that, The contact piece is provided with a flexible connection segment on the side facing the flexible connection, and a contact segment is provided on the other side of the contact piece; The flexible connector segment is fixedly electrically connected to the contact segments of the two or more sets of flexible connectors.

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