A double-break circuit breaker

Abstract

The application provides a double-break circuit breaker, and belongs to the technical field of electrical equipment. The double-break circuit breaker comprises a shell, a static contact and an operating mechanism. The shell is internally provided with a mounting space. The static contact is located in the mounting space. The operating mechanism is located in the mounting space and is located on one side of the static contact. The operating mechanism comprises a supporting piece, a contact supporting piece and a moving contact assembly. The supporting piece is rotationally connected with the shell through a first rotating shaft. The contact supporting piece is rotationally connected with the shell through a second rotating shaft. The contact supporting piece is in abutment with the supporting piece. The moving contact assembly is rotationally connected with the contact supporting piece through a third rotating shaft. One end of a torsional spring, which is sleeved on the third rotating shaft, is in abutment with the contact supporting piece, and the other end is in abutment with the moving contact assembly. In the application, the first rotating shaft, the second rotating shaft and the third rotating shaft make the supporting piece, the contact supporting piece, the moving contact assembly, the handle and the connecting rod cooperate to form a five-link mechanism, so that the moving contact assembly is provided with a tendency to move towards the static contact, and the use reliability of the double-break circuit breaker is improved.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and more particularly to a double-break circuit breaker. Background Technology

[0002] In modern power systems, circuit breakers are crucial equipment for ensuring the safe and stable operation of power. They not only handle the connection and disconnection of normal circuits, but also rapidly cut off current in the event of a fault, preventing the escalation of the accident, making them veritable "guardians of power system safety." With the booming development of the global economy and the increasing electrification of various industries, the circuit breaker market continues to expand.

[0003] Most existing circuit breakers adopt a single-break group design. However, since single-break group circuit breakers have difficulty effectively interrupting DC arcs with voltages above 275V, double-break circuit breakers have gradually emerged. However, existing double-break circuit breakers suffer from low reliability. Summary of the Invention

[0004] This application provides a double-break circuit breaker to improve the reliability of double-break circuit breakers.

[0005] In a first aspect, this application provides a double-break circuit breaker, which includes a housing, a stationary contact, and an operating mechanism. The housing has an internal installation space. The stationary contact is disposed within the installation space. The operating mechanism is disposed within the installation space and on one side of the stationary contact. The operating mechanism includes a support member, a contact support, and a moving contact assembly. The support member is rotatably connected to the housing via a first rotating shaft. The contact support is rotatably connected to the housing via a second rotating shaft, and the contact support abuts against the support member. The moving contact assembly is rotatably connected to the contact support via a third rotating shaft. A torsion spring is sleeved on the third rotating shaft, with one end of the torsion spring abutting against the contact support and the other end abutting against the moving contact assembly. When the circuit is closed, the support member rotates around the first rotating shaft, causing the contact support to rotate around the axis of the second rotating shaft, thereby bringing the moving contact assembly closer to the stationary contact. After the moving contact assembly comes into contact with the stationary contact, the contact support drives the third rotating shaft to continue rotating towards the stationary contact. The moving contact assembly rotates around the axis of the third rotating shaft towards the stationary contact.

[0006] Through the above-described scheme, this application incorporates a first, second, and third rotating shaft within the operating mechanism. This allows the support components, contact supports, and moving contact assembly within the operating mechanism to cooperate with the handle and linkage within the double-break circuit breaker, forming a five-bar linkage mechanism. During the switching process from the open to the energized state of the double-break circuit breaker, the distance the moving contact assembly travels towards the stationary contact is increased, giving it a tendency to continue moving towards the stationary contact, thus creating overtravel. When the moving contact assembly overtravels, it reduces the problem of one-sided contact caused by the difference in opening distance between the two break groups within the double-break circuit breaker, thereby improving the reliability of the double-break circuit breaker. The torsion spring provides a force for the moving contact assembly to continue moving towards the stationary contact, ensuring effective contact between the moving contact assembly and the stationary contact.

[0007] By using the third rotating shaft, as the moving contact assembly moves away from the contact support, the moving contact on the moving contact assembly slides relative to the stationary contact on the stationary contact. This reduces the sticking problem between the moving and stationary contacts caused by arc erosion. Furthermore, the relative sliding between the moving and stationary contacts generates friction, reducing oxide contamination on their surfaces and lowering the contact resistance. This, in turn, reduces the temperature rise and power consumption of the double-break circuit breaker, further improving its reliability.

[0008] In one possible design, the support member has a pushing surface, which is flat. The contact support has a force-bearing surface, which is curved. The pushing surface and the force-bearing surface are in constant contact.

[0009] With the above scheme, the pushing surface is set as a plane and the force-bearing surface is set as an arc surface, so that the support and the contact support can be in continuous and stable contact during rotation. This ensures that the support and the contact support are in a continuous contact state, reduces the occurrence of contact failure between the support and the contact support, improves the reliability of the operating mechanism, and thus improves the reliability of the double-break circuit breaker.

[0010] In one possible design, the support member has a first clearance hole, through which a second rotating shaft passes, the first clearance hole providing clearance for the second rotating shaft. The contact support has a second clearance hole, through which a first rotating shaft passes, the second clearance hole providing clearance for the first rotating shaft.

[0011] With the above scheme, the support rotates around the axis of the first rotating shaft, and the contact support rotates around the axis of the second rotating shaft. The projection of the support on the first and / or second rotating shafts coincides with the projection of the contact support on the first and / or second rotating shafts. Since the rotation radii of the support and the contact support are different, a first clearance hole is set to allow space for the second rotating shaft, and a second clearance hole is set to allow space for the first rotating shaft. This can reduce the interference problem that occurs between the support and the contact support during rotation, thereby improving the reliability of the operating mechanism and thus improving the reliability of the double-break circuit breaker.

[0012] In one possible design, the moving contact assembly includes a moving contact and a contact support. The moving contact includes a first moving contact and a second moving contact, and the end of the first moving contact away from the moving contact point and the end of the second moving contact away from the moving contact point are connected by a connecting plate. The connecting plate and the contact support are connected by a rotating shaft, which is parallel to the moving contact. The contact support is connected to the contact support by a third rotating shaft. The moving contact rotates about the rotating shaft.

[0013] In the above scheme, the end of the first moving contact furthest from the moving contact point and the end of the second moving contact furthest from the moving contact point are connected by a connecting plate, thus forming a connection between the first and second moving contacts. The connecting plate is connected to the contact support via a rotating shaft, allowing the moving contact to rotate around the rotating shaft, thereby causing either the first or second moving contact to rotate closer to the stationary contact. When the first or second moving contact rotates closer to the stationary contact, the difference in opening distance between the two break groups can be reduced, thereby reducing the occurrence of single-sided contact problems and improving the reliability of the operating mechanism, thus achieving the goal of improving the reliability of the double-break circuit breaker.

[0014] In one possible design, the contact holder has a dome on the side near the contact support, and the dome and the contact holder are in constant contact.

[0015] With the above solution, a dome is provided on the contact support, and the dome is in constant contact with the contact support. When the contact support drives the contact assembly to rotate, the dome of the contact support and the contact support can maintain continuous and stable contact. This ensures that the contact support and the contact support are in a continuous contact state, reducing the occurrence of contact failure between the contact support and the contact support, thereby improving the reliability of the operating mechanism and thus improving the reliability of the double-break circuit breaker.

[0016] In one possible design, the contact support has a protrusion on the side facing the stationary contact. The double-break circuit breaker also includes a tripping element, which is arranged parallel to the stationary contact. The tripping element pushes against the protrusion, causing the contact support to move away from the stationary contact.

[0017] With the above-mentioned design, the protrusion is positioned towards the stationary contact, allowing the tripping element to push against the contact bracket. Thus, during the transition of the double-break circuit breaker from the energized state to the open state, after the tripping element pushes against the latch, it can also provide thrust to the contact bracket, enabling the moving contact to move away from the stationary contact more quickly. This improves the breaking rate between the moving and stationary contacts, thereby enhancing the reliability of the double-break circuit breaker.

[0018] In one possible design, the double-break circuit breaker also includes a metal component and a thermal release rod. The operating mechanism is located between the metal component and the stationary contact. The operating mechanism is linked to the metal component via the thermal release rod. The contact support is equipped with a baffle that shields the thermal release rod.

[0019] By incorporating metal components and a thermal release rod within the double-break circuit breaker, the above-described solution enables it to provide thermal protection. Furthermore, by installing a baffle on the contact support, during the transition from the energized to the open state, the baffle partially blocks the generated electric arc, reducing the likelihood of arc splashing onto the thermal release rod. This minimizes arc erosion of the thermal release rod, extending its service life and ultimately improving the reliability of the double-break circuit breaker.

[0020] In one possible design, the double-break circuit breaker also includes an arc-starting plate. The arc-starting plate has an arc-starting end that is close to the moving contact assembly.

[0021] By incorporating an arc-starting plate into the above scheme, the arc generated during the transition from the energized to the open state of the double-break circuit breaker can be attracted, thus increasing the arc extinguishing speed. Positioning the arc-starting end closer to the moving contact assembly further enhances the arc-attracting effect of the arc-starting plate, allowing the arc to extinguish more quickly. A faster arc extinguishing speed reduces the erosion of the moving and stationary contacts by the arc, thereby extending the service life of the double-break circuit breaker.

[0022] In one possible design, the moving contact has an arc-shaped running track, which is located between the moving contact point and the arc-initiating end of the moving contact.

[0023] With the above scheme, an electric arc is generated during the process of the double-break circuit breaker changing from the energized state to the open state. The arc-shaped arc track set on the moving contact can guide the electric arc, so that the electric arc can enter the arc extinguishing chamber of the double-break circuit breaker more quickly. This can speed up the extinguishing of the electric arc, thereby reducing the erosion of the moving and stationary contacts by the electric arc, and thus improving the service life of the double-break circuit breaker.

[0024] In one possible design, the operating mechanism also includes a return spring. One end of the return spring is connected to the third rotating shaft, and the other end is connected to a fixed structure within the housing.

[0025] With the above solution, when the double-break circuit breaker switches from the energized state to the open state, the reset spring can provide reset power for the operating mechanism after the tripping component pushes against the latch, ensuring that the operating mechanism can be reset normally and guaranteeing that the operating mechanism can be used normally afterwards. This can improve the reliability of the double-break circuit breaker. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the internal structure of a double-break circuit breaker provided in an embodiment of this application.

[0027] Figure 2 A schematic diagram of the operating mechanism provided in the embodiments of this application.

[0028] Figure 3 This is an assembly diagram of the contact support and moving contact assembly provided in the embodiments of this application.

[0029] Figure 4 This is a schematic diagram of the operating mechanism of the double-break circuit breaker provided in this application embodiment when it is in the open state.

[0030] Figure 5 This is a schematic diagram of the operating mechanism of the double-break circuit breaker provided in this application embodiment when it is in the energized state.

[0031] Figure 6 A schematic diagram of the structure of the support component provided in the embodiments of this application.

[0032] Figure 7 This is a schematic diagram of the contact support structure provided in an embodiment of this application.

[0033] Figure 8 This is an assembly diagram of the support components and contact supports provided in the embodiments of this application.

[0034] Figure 9 This is a cross-sectional view of the moving contact assembly provided in an embodiment of this application.

[0035] Figure 10 for Figure 3A schematic diagram of the structure after removing the contact support.

[0036] Figure 11 This is a schematic diagram of the contact support provided in an embodiment of this application.

[0037] Figure 12 This is a schematic diagram of the operating mechanism when the moving contact and the stationary contact are in contact, as provided in an embodiment of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 100. Shell;

[0040] 200. Stationary contact;

[0041] 300. Operating mechanism; 310. Support component; 311. Pushing surface; 312. First clearance hole; 320. Contact support; 321. Force-bearing surface; 322. Second clearance hole; 330. Moving contact assembly; 331. Contact bracket; 331a. Dome; 331b. Protrusion; 331c. Baffle; 332. First moving contact; 333. Second moving contact; 334. Connecting plate; 335. Rotating shaft; 336. Arc-shaped running track; 340. First rotating shaft; 350. Second rotating shaft; 360. Third rotating shaft; 370. Torsion spring; 380. Lock; 390. Jumper lock;

[0042] 400. Metal parts; 410. Thermal release rod;

[0043] 500, Arc-starting plate;

[0044] 600. Return spring;

[0045] 700, Handle;

[0046] 800, connecting rod;

[0047] 900. Fasteners;

[0048] OX, First Direction;

[0049] A. The line connecting the center of the second rotating shaft and the center of the stationary contact;

[0050] B. The side of the stationary contact closest to the moving contact assembly faces the extension line of the second rotating shaft. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0053] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and drawings of this application are intended to cover without excluding other meanings. The words "a" or "an" do not exclude the presence of multiples.

[0054] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0056] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0057] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0058] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by fasteners, such as a connection secured by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0059] Because single-break circuit breakers cannot effectively interrupt DC arcs, double-break circuit breakers have gradually emerged. A double-break circuit breaker consists of two stationary contacts and two parallel moving contacts. It comprises two break groups: one moving contact and one stationary contact form one break group within the double-break group, while the other moving contact and the other stationary contact form the other break group.

[0060] A double-break circuit breaker consists of two break groups connected in series. Each break group acts as a voltage divider, thus reducing the arc energy carried by each group and minimizing electrical erosion of the contacts. However, due to microscopic differences and variations in component and assembly tolerances, the arc energy carried by each break group differs, leading to variations in the degree of erosion between the two groups. After repeated use, the difference in opening distance between the two break groups gradually increases, potentially causing one-sided contact and reducing the reliability of the double-break circuit breaker.

[0061] To address the aforementioned problems and improve the reliability of double-break circuit breakers, this application provides a double-break circuit breaker. To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0062] Figure 1 This is a schematic diagram of the internal structure of a double-break circuit breaker provided in an embodiment of this application. Figure 2 A schematic diagram of the operating mechanism provided in the embodiments of this application. Figure 3 This is an assembly diagram of the contact support and moving contact assembly provided in an embodiment of this application. Figures 1 to 3 As shown, this application provides a double-break circuit breaker, which includes a housing 100, a stationary contact 200, and an operating mechanism 300. The housing 100 has an internal mounting space. The stationary contact 200 is disposed within the mounting space. The operating mechanism 300 is disposed within the mounting space and is located on one side of the stationary contact 200. The operating mechanism 300 includes a support 310, a contact support 320, and a moving contact assembly 330. The support member 310 is rotatably connected to the housing 100 via the first rotating shaft 340. The contact support 320 is rotatably connected to the housing 100 via the second rotating shaft 350. The contact support 320 abuts against the support member 310. The moving contact assembly 330 is rotatably connected to the contact support 320 via the third rotating shaft 360. A torsion spring 370 is sleeved on the third rotating shaft 360. One end of the torsion spring 370 abuts against the contact support 320, and the other end of the torsion spring 370 abuts against the moving contact assembly 330.

[0063] The housing 100 includes a top cover and a base, which together form an installation space. Mounting bosses and mounting grooves can be provided inside both the top cover and the base. Thus, when the top cover and base are closed, one end of the first rotating shaft 340 and one end of the second rotating shaft 350 can be positioned in the mounting groove on the top cover, and the other ends of the first rotating shaft 340 and the second rotating shaft 350 can be positioned in the mounting groove on the base, thereby achieving a fixed connection between the first rotating shaft 340 and the second rotating shaft 350 on the housing 100.

[0064] The first rotating shaft 340 can pass through the support member 310, enabling the support member 310 to be rotatably connected to the housing 100. The second rotating shaft 350 can pass through the contact support 320, enabling the contact support 320 to be rotatably connected to the housing 100. The contact support 320 abuts against the support member 310, and the support member 310 can drive the contact support 320 to rotate synchronously during rotation.

[0065] The operating mechanism 300 also includes a latch 380 and a trip latch 390, both of which are connected to the support member 310. The latch 380 and trip latch 390 have two states: a locked state and a released state. Correspondingly, the double-break circuit breaker also has two states: an energized state and an open state. When the latch 380 and trip latch 390 are in the locked state, they are engaged, and the double-break circuit breaker is energized. When the latch 380 and trip latch 390 are in the released state, they are not in contact, and the double-break circuit breaker is open.

[0066] The double-break circuit breaker also includes a handle 700 and a connecting rod 800. One end of the handle 700 is rotatably connected to the connecting rod 800, and the other end of the connecting rod 800 is rotatably connected to the trip latch 390. Since the trip latch 390 is connected to the support member 310, the handle 700 can drive the operating mechanism 300 to rotate via the connecting rod 800. Therefore, the handle 700, the connecting rod 800, the support member 310, and the contact support 320 can form a four-bar linkage mechanism.

[0067] This application also includes a third rotating shaft 360 and a moving contact assembly 330 within the operating mechanism 300. The moving contact assembly 330 is rotatably connected to the contact support 320 via the third rotating shaft 360. In this case, the handle 700, connecting rod 800, support 310, contact support 320, and moving contact assembly 330 can form a five-bar linkage.

[0068] Figure 4 This is a schematic diagram of the operating mechanism of the double-break circuit breaker provided in this application embodiment when it is in the open state. Figure 3 as well as Figure 4 As shown, it should be noted that, with Figure 4 Taking the position of the operating mechanism 300 as an example, when the operating mechanism 300 is in the open state, the third rotating shaft 360 is located to the right of the line connecting the first rotating shaft 340 and the second rotating shaft 350. This arrangement allows for rotational space around the third rotating shaft 360 after the moving contact and stationary contact are in contact, which can avoid interference between parts in the double-break circuit breaker and reduce the occurrence of movement jamming problems in the operating mechanism 300.

[0069] The motion process of the five-bar linkage mentioned in this application will be described in detail below with reference to the accompanying drawings.

[0070] Figure 5 This is a schematic diagram of the operating mechanism of the double-break circuit breaker provided in this application embodiment when it is in the energized state. Figures 3 to 5 As shown, the support member 310 can rotate about the axis of the first rotating shaft 340. The support member 310 can drive the contact support 320 and the moving contact assembly 330 to rotate about the axis of the second rotating shaft 350, so that the moving contact assembly 330 approaches the stationary contact 200. After the moving contact assembly 330 contacts the stationary contact 200, the contact support 320 can drive the third rotating shaft 360 to continue rotating towards the stationary contact 200, and the moving contact assembly 330 continues to rotate about the axis of the third rotating shaft 360 towards the stationary contact 200.

[0071] by Figure 4 and Figure 5 Taking the placement of the operating mechanism 300 as an example, and combining it with... Figure 3As shown, the handle 700 rotates clockwise. Driven by the connecting rod 800, the support 310 rotates clockwise around the axis of the first rotating shaft 340. Since the support 310 abuts against the contact support 320, the support 310 can drive the contact support 320 during rotation, causing the contact support 320 to rotate clockwise around the axis of the second rotating shaft 350.

[0072] Since the moving contact assembly 330 and the contact support 320 are rotatably connected via a third rotating shaft 360, and a torsion spring 370 is sleeved on the third rotating shaft 360, with one end of the torsion spring 370 abutting against the contact support 320 and the other end abutting against the moving contact assembly 330, the moving contact assembly 330 can remain relatively stationary with respect to the contact support 320 under the torque of the torsion spring 370. As the contact support 320 rotates clockwise around the axis of the second rotating shaft 350, it can also drive the moving contact assembly 330 to rotate clockwise around the axis of the second rotating shaft 350, thus bringing the moving contact assembly 330 closer to the stationary contact 200.

[0073] When the moving contact assembly 330 comes into contact with the stationary contact 200, since the rotation process of the handle 700 is not yet complete, the support 310 will also drive the contact support 320 to rotate clockwise. At the same time, the contact support 320 will drive the third rotating shaft 360 to continue to rotate clockwise.

[0074] Driven by the handle 700, the moving contact assembly 330 tends to continue rotating clockwise around the third pivot 360. However, the moving contact assembly 330 is in contact with the stationary contact 200 and cannot continue to rotate. At this time, the force exerted on the moving contact assembly 330 by the continued rotation of the handle 700 will be decomposed into a horizontal force and a vertical force. The horizontal force can cause the moving contact assembly 330 to abut against the stationary contact 200, and the vertical force can cause the moving contact assembly 330 to move away from the contact support 320.

[0075] As the moving contact assembly 330 moves away from the contact support 320, the moving contact on the moving contact assembly 330 slides relative to the stationary contact on the stationary contact 200. This reduces the sticking problem between the moving and stationary contacts caused by arc erosion. Furthermore, the relative sliding between the moving and stationary contacts generates friction, reducing oxide contamination on their surfaces and thus lowering the contact resistance. This, in turn, reduces the temperature rise and power consumption of the double-break circuit breaker.

[0076] It should be noted that, since there will be relative sliding between the moving contact and the stationary contact, in order to reduce the occurrence of misalignment between the moving contact and the stationary contact, in the design of this application, the initial position of the moving contact and the stationary contact can be located at a position slightly above the center of the stationary contact, and the initial position of the moving contact and the stationary contact can be closer to the handle 700 of the double-break circuit breaker.

[0077] In summary, this application incorporates a first rotating shaft 340, a second rotating shaft 350, and a third rotating shaft 360 within the operating mechanism 300. This allows the support member 310, contact support 320, and moving contact assembly 330 within the operating mechanism 300 to cooperate with the handle 700 and connecting rod 800 within the double-break circuit breaker, forming a five-bar linkage. During the switching process of the double-break circuit breaker from the open state to the energized state, the distance the moving contact assembly 330 moves towards the stationary contact 200 is increased, giving it a tendency to continue moving towards the stationary contact 200, thus creating overtravel. When the moving contact assembly 330 experiences overtravel, it reduces the problem of one-sided contact caused by the difference in the opening distance between the two break groups within the double-break circuit breaker, thereby improving the reliability of the double-break circuit breaker. The torsion spring 370 provides a force for the moving contact assembly 330 to continue moving toward the stationary contact 200, so that the moving contact assembly 330 can effectively abut against the stationary contact 200.

[0078] The operating mechanism 300 mentioned in this application has three rotation centers, namely the axis of the first rotating shaft 340, the axis of the second rotating shaft 350, and the axis of the third rotating shaft 360. The first rotating shaft 340 is located between the second rotating shaft 350 and the third rotating shaft 360. Since the third rotating shaft 360 is connected to the moving contact assembly 330, the second rotating shaft 350 is farther away from the moving contact assembly 330 than the first rotating shaft 340.

[0079] Based on the above description, the support 310 can drive the contact support 320 and the moving contact assembly 330 to rotate around the axis of the second rotating shaft 350. Therefore, the moving contact assembly 330 rotates around the axis of the second rotating shaft 350. Compared to the prior art, the rotation center of the moving contact assembly 330 in this application is further away from the moving contact assembly 330. Thus, during the disconnection process of the double-break circuit breaker, the rotation radius of the moving contact assembly 330 can be increased within the existing limited space, thereby increasing the stroke of the moving contact assembly 330. When the stroke of the circuit breaker assembly 330 increases, the opening distance between the moving contact assembly 330 and the stationary contact 200 can be increased. This is beneficial for extinguishing the arc between the moving contact assembly 330 and the stationary contact 200, thereby improving the reliability of the double-break circuit breaker.

[0080] Figure 6 A schematic diagram of the structure of the support component provided in the embodiments of this application. Figure 7 This is a schematic diagram of the contact support structure provided in an embodiment of this application. Figure 8 This is an assembly diagram of the support components and contact supports provided in the embodiments of this application. Figures 6 to 8 As shown, the support member 310 has a pushing surface 311, which is a plane. The contact support 320 has a force-bearing surface 321, which is an arc surface. The pushing surface 311 and the force-bearing surface 321 are in constant contact.

[0081] The pushing surface 311 can be the side wall of the support member 310 that contacts the contact support 320, and the force-bearing surface 321 can be the side wall of the contact support 320 that contacts the support member 310.

[0082] When the support member 310 abuts against the contact support 320, specifically, the pushing surface 311 abuts against the force-bearing surface 321. During rotation, the support member 310 can push against the contact support 320, causing the contact support 320 to rotate together with it. During this process, the support member 310 rotates about the first axis 340, while the contact support 320 rotates about the second axis 350. Therefore, the rotation centers of the support member 310 and the contact support 320 are different, resulting in relative movement between them.

[0083] Based on this, the present application sets the pushing surface 311 as a plane and the force-bearing surface 321 as an arc surface, so that the support member 310 and the contact support 320 can maintain continuous and stable contact during rotation. This ensures that the support member 310 and the contact support 320 are in a continuous contact state, reduces the occurrence of contact failure between the support member 310 and the contact support 320, improves the reliability of the operating mechanism 300, and thus improves the reliability of the double-break circuit breaker.

[0084] In addition, this application can also design the pushing surface 311 as an arc surface and the force-bearing surface 321 as a plane. Such a design can also reduce the problem of contact failure between the support 310 and the contact support 320.

[0085] like Figure 2 , Figure 6 as well as Figure 7 As shown, the support member 310 is provided with a first clearance hole 312, through which the second rotating shaft 350 passes. The first clearance hole 312 is used to allow space for the second rotating shaft 350. The contact support 320 is provided with a second clearance hole 322, through which the first rotating shaft 340 passes. The second clearance hole 322 is used to allow space for the first rotating shaft 340.

[0086] The first clearance hole 312 can be a racetrack-shaped through hole structure provided on the support member 310, or the first clearance hole 312 can be a racetrack-shaped through groove structure provided on the support member 310. The second rotating shaft 350 can pass through the first clearance hole 312. The second clearance hole 322 can be a racetrack-shaped through hole structure provided on the contact support 320, or the second clearance hole 322 can be a racetrack-shaped through groove structure provided on the contact support 320. The first rotating shaft 340 can pass through the second clearance hole 322.

[0087] In summary, the support member 310 rotates around the axis of the first rotating shaft 340, and the contact support 320 rotates around the axis of the second rotating shaft 350. The projections of the support member 310 onto the first rotating shaft 340 and / or the second rotating shaft 350 partially coincide with the projections of the contact support 320 onto the first rotating shaft 340 and / or the second rotating shaft 350. Since the rotation radii of the support member 310 and the contact support 320 are different, the first clearance hole 312 is provided to allow space for the second rotating shaft 350, and the second clearance hole 322 is provided to allow space for the first rotating shaft 340. This reduces interference between the support member 310 and the contact support 320 during rotation, thereby improving the reliability of the operating mechanism 300 and, consequently, the reliability of the double-break circuit breaker.

[0088] Figure 9 This is a cross-sectional view of the moving contact assembly provided in an embodiment of this application. Figure 10 for Figure 3 A schematic diagram of the structure after removing the contact support. (See diagram below.) Figure 3 , Figure 9 as well as Figure 10 As shown, the moving contact assembly 330 includes a moving contact and a contact support 331. The moving contact includes a first moving contact 332 and a second moving contact 333. The end of the first moving contact 332 away from the moving contact point and the end of the second moving contact 333 away from the moving contact point are connected by a connecting plate 334. The connecting plate 334 and the contact support 331 are connected by a rotating shaft 335, which is parallel to the moving contact. The contact support 331 is connected to the contact support 320 via a third rotating shaft 360. The moving contact can rotate about the axis of the rotating shaft 335.

[0089] The contact support 331 can be disposed on one side of the connecting plate 334. The connecting plate 334 and the contact support 331 can be connected by a rotating shaft 335. The first moving contact 332, the connecting plate 334, and the second moving contact 333 can rotate about the rotating shaft 335. There is a gap between the connecting plate 334 and the contact support 331, so that there will be no interference between the connecting plate 334 and the contact support 331 when the first moving contact 332, the connecting plate 334, and the second moving contact 333 rotate, thereby making the rotation of the first moving contact 332, the connecting plate 334, and the second moving contact 333 more stable.

[0090] The rotating shaft 335 can be made of leaded brass. The self-lubricating properties of leaded brass can improve the smoothness of rotation of the first moving contact 332, the connecting plate 334, and the second moving contact 333.

[0091] The rotating shaft 335 and the connecting plate 334 can be riveted together. A shim can be placed at the riveting point between the rotating shaft 335 and the connecting plate 334 to improve the riveting strength and rotational fatigue strength of the rotating shaft 335.

[0092] In summary, the end of the first moving contact 332 furthest from the moving contact point and the end of the second moving contact 333 furthest from the moving contact point are connected by a connecting plate 334, thus forming a parallel connection between the first moving contact 332 and the second moving contact 333. The connecting plate 334 is connected to the contact support 331 via a rotating shaft 335, allowing the moving contact to rotate around the rotating shaft 335, thereby causing either the first moving contact 332 or the second moving contact 333 to rotate towards the stationary contact 200. When either the first moving contact 332 or the second moving contact 333 rotates towards the stationary contact 200, the difference in opening distance between the two break groups can be reduced, thereby reducing the occurrence of single-sided contact problems and improving the reliability of the operating mechanism 300, thus achieving the goal of improving the reliability of the double-break circuit breaker.

[0093] Figure 11 This is a schematic diagram of the contact support provided in an embodiment of this application. Figure 3 as well as Figure 11 As shown, the contact support 331 has a dome 331a on the side near the contact support 320, and the dome 331a and the contact support 320 are in constant contact.

[0094] The dome 331a is the part where the contact support 331 and the contact holder 320 abut against each other. The dome 331a has an arc surface. The side wall of the contact holder 320 that contacts the dome 331a is flat. This ensures that the contact holder 320 and the contact support 331 are in a continuous abutment state.

[0095] In summary, the contact support 331 is provided with a dome 331a, and the dome 331a is in constant contact with the contact support 320. When the contact support 320 drives the contact assembly 330 to rotate, the dome 331a of the contact support 320 and the contact support 331 can maintain continuous and stable contact. This ensures that the contact support 320 and the contact support 331 are in continuous contact, reducing the occurrence of contact failure between the contact support 320 and the contact support 331, thereby improving the reliability of the operating mechanism 300 and, consequently, the reliability of the double-break circuit breaker.

[0096] Please continue to refer to Figure 3 As shown, a cavity is provided at the connection between the contact support 331 and the contact support 320. The contact support 320 can wrap the cavity. When the contact support 320 is connected to the moving contact assembly 330 through the third rotating shaft 360, the third rotating shaft 360 can pass through the cavity and is partially located in the cavity.

[0097] The torsion spring 370 can be sleeved on the third rotating shaft 360 located in the cavity. One end of the torsion spring 370 can abut against the contact support 320, and the other end of the torsion spring 370 can abut against the contact bracket 331.

[0098] In this way, the cavity design not only provides installation space for the torsion spring 370, but also allows the torsion spring 370 to be better positioned within the cavity to provide torque between the contact bracket 331 and the contact support 320.

[0099] like Figure 1 as well as Figure 11 As shown, the contact support 331 has a protrusion 331b on the side facing the stationary contact 200. The double-break circuit breaker also includes a tripping element 900, which is arranged parallel to the stationary contact 200. The tripping element 900 can push against the protrusion 331b, causing the contact support 331 to move away from the stationary contact 200.

[0100] The tripping element 900 can be a rod-shaped structure installed inside a double-break circuit breaker. Since the tripping element 900 is arranged parallel to the stationary contact 200 and the stationary contact 200 faces the operating mechanism 300, the tripping element 900 can also face the operating mechanism 300.

[0101] A coil may be wound around the tripping element 900. When a short circuit or open circuit occurs in the double-break circuit breaker, the current in the coil will increase instantaneously. When the current increases, the magnetic field generated by the coil will also increase instantaneously. The instantaneously increased magnetic field can cause the tripping element 900 to move toward the operating mechanism 300.

[0102] by Figure 5Taking the placement of the operating mechanism 300 as an example, when the double-break circuit breaker is in the energized state, the latch 380 and the trip latch 390 are engaged, with the latch 380 portion close to the stationary contact 200. When a short circuit or open circuit occurs within the double-break circuit breaker, the tripping member 900 can push against the portion of the latch 380 near the stationary contact 200, causing the latch 380 to rotate counterclockwise. At this time, the latch 380 and the trip latch 390 can change from a locked state to a released state, and the double-break circuit breaker can change from an energized state to an open state.

[0103] The protrusion 331b can be a protrusion structure provided on the side of the contact support 331 facing the stationary contact 200. When the double-break circuit breaker is energized, the closest distance between the latch 380 and the tripping member 900 is less than the closest distance between the protrusion 331b and the tripping member 900. With this configuration, when a short circuit or open circuit occurs in the double-break circuit breaker, the tripping member 900 will first push against the latch 380, allowing the latch 380 and the tripping latch 390 to change from a locked state to a released state. Immediately afterwards, the tripping member 900 will push against the protrusion 331b, causing the contact support 331 to move the moving contact away from the stationary contact 200 quickly.

[0104] In summary, the protrusion 331b is positioned towards the stationary contact 200, allowing the tripping element 900 to push against the contact bracket 331. Thus, during the transition of the double-break circuit breaker from the energized state to the open state, after the tripping element 900 pushes against the latch 380, it can also provide a thrust to the contact bracket 331, enabling the moving contact to move away from the stationary contact 200 more quickly. This improves the breaking rate between the moving and stationary contacts 200, thereby enhancing the reliability of the double-break circuit breaker.

[0105] like Figure 1 , Figure 3 as well as Figure 4 As shown, the operating mechanism 300 also includes a reset spring 600. One end of the reset spring 600 is connected to the third rotating shaft 360, and the other end of the reset spring 600 is connected to a fixed structure inside the housing 100.

[0106] The reset spring 600 includes two opposite ends. One end of the reset spring 600 may have a large hook, and the other end may have a small hook. Having hooks of different sizes at both ends of the reset spring 600 allows for better differentiation of the suspension positions at both ends during installation.

[0107] When the reset spring 600 is installed inside the operating mechanism 300, it can be suspended by the third rotating shaft 360 using a large hook, and then connected to the fixing structure provided on the housing 100 using a small hook.

[0108] When the double-break circuit breaker is energized, the reset spring 600 is in a stretched state. During the process of switching the double-break circuit breaker from the energized state to the open state, the reset spring 600 will restore its deformation. When the reset spring 600 restores its deformation, it will generate an elastic force, which can drive the moving contact assembly 330 to move away from the stationary contact 200.

[0109] It should be noted that when the double-break circuit breaker is in the energized state, the included angle between the line connecting the second shaft 350 and the third shaft 360, and the line connecting the third shaft 360 and the reset spring 600 to the housing 100, can be an acute angle. When the double-break circuit breaker is in the open state, the included angle between the reset spring 600 and the line connecting the third shaft 360 and the second shaft 350 can be an obtuse angle. From the above description, it can be seen that during the process of the double-break circuit breaker changing from the energized state to the open state, the included angle between the reset spring 600 and the line connecting the third shaft 360 and the second shaft 350 can change from an acute angle to an obtuse angle. During the process of the acute angle changing to the obtuse angle, the angle between the reset spring 600 and the line connecting the third rotating shaft 360 and the second rotating shaft 350 can be briefly in a right angle state. When the angle is in a right angle state, the elastic force generated by the reset spring 600 when restoring its deformation is the opening force. In this way, the separation rate of the moving contact assembly 330 and the stationary contact 200 can be effectively improved.

[0110] In summary, when the double-break circuit breaker switches from the energized state to the open state, the reset spring 600 provides reset power for the operating mechanism 300 after the tripping component 900 pushes against the latch 380, ensuring that the operating mechanism 300 can be reset normally and guaranteeing that the operating mechanism 300 can be used normally afterward. This improves the reliability of the double-break circuit breaker.

[0111] Please continue to refer to Figure 1 as well as Figure 3 As shown, the double-break circuit breaker also includes a metal component 400 and a thermal release rod 410. An operating mechanism 300 is located between the metal component 400 and the stationary contact 200, and is linked to the metal component 400 via the thermal release rod 410. The contact support 331 is provided with a baffle 331c, which can shield the thermal release rod 410.

[0112] Thermal protection is one of the important safety functions of a double-break circuit breaker. It is primarily used to prevent overheating damage to the circuit due to overload, thus avoiding potential safety hazards such as fires.

[0113] The metal part 400 can be a bimetallic strip disposed on the side of the operating mechanism 300 away from the stationary contact 200. One end of the thermal release rod 410 is connected to the latch 380 of the operating mechanism 300, and the other end of the thermal release rod 410 is connected to the side of the metal part 400 opposite to the operating mechanism 300. When the double-break circuit breaker overheats due to circuit overload, the metal part 400 will deform. When the metal part 400 deforms, it will push the thermal release rod 410, causing the thermal release rod 410 to move away from the operating mechanism 300. At this time, the thermal release rod 410 can drive the latch 380 to rotate, so that the latch 380 and the trip latch 390 can change from a locked state to a released state, thereby changing the double-break circuit breaker from an energized state to an open state.

[0114] The baffle 331c can be a plate-shaped structure provided on the side of the contact support 331 away from the stationary contact 200. The baffle 331c can block part of the first moving contact 332 and part of the second moving contact 333.

[0115] In some possible embodiments, since the contact support 331 is mounted inside the base, the baffle 331c can also be a plate-like structure that extends the contact support 331 toward the top cover.

[0116] In summary, the inclusion of a metal component 400 and a thermal release rod 410 within the double-break circuit breaker enables it to provide thermal protection. The baffle 331c on the contact bracket 331 shields part of the electric arc generated during the transition from the energized to the open state of the double-break circuit breaker, reducing the likelihood of arc sputtering onto the thermal release rod 410. This minimizes arc erosion of the thermal release rod 410, thereby extending its service life and ultimately improving the reliability of the double-break circuit breaker.

[0117] Please continue to refer to Figure 1 As shown, the double-break circuit breaker also includes an arc-starting plate 500. The arc-starting plate 500 has an arc-starting end, which is close to the moving contact assembly 330.

[0118] During the process of a double-break circuit breaker changing from the energized state to the open state, an electric arc will be generated between the moving contact and the stationary contact 200. The arc-inducing plate 500 can attract these electric arcs, allowing them to enter the arc-extinguishing chamber of the double-break circuit breaker more quickly.

[0119] In summary, by incorporating the arc-starting plate 500, the arc generated during the transition of the double-break circuit breaker from the energized to the open state can be attracted, thus increasing the arc extinguishing speed. The arc-starting end is closer to the moving contact assembly 330, further enhancing the arc-attracting effect of the arc-starting plate 500 and enabling the arc to extinguish more quickly. A faster arc extinguishing speed reduces the erosion of the moving and stationary contacts by the arc, thereby extending the service life of the double-break circuit breaker.

[0120] like Figure 1 , Figure 3 as well as Figure 10 As shown, the moving contact is provided with an arc-shaped running track 336, which is located between the moving contact point and the arc-initiating end of the moving contact.

[0121] Both the first moving contact 332 and the second moving contact 333 have an extension section in the direction away from the contact support 331. The surface of the extension section can be arc-shaped and the surface of the extension section can be concave in the direction away from the stationary contact 200.

[0122] The arc-initiating end of the arc-initiating plate 500 can be closer to the arc-shaped running track 336 on the moving contact. The arc-initiating plate 500 can cooperate with the arc-shaped running track 336 on the moving contact, thereby further accelerating the arc extinguishing speed.

[0123] In summary, an electric arc is generated during the transition of a double-break circuit breaker from the energized state to the open state. The arc-shaped arc track 336 set on the moving contact can guide the arc, allowing it to enter the arc-extinguishing chamber of the double-break circuit breaker more quickly. This accelerates the extinguishing of the arc, thereby reducing the erosion of the moving and stationary contacts by the arc and ultimately improving the service life of the double-break circuit breaker.

[0124] Figure 12 This is a schematic diagram of the operating mechanism when the moving contact and the stationary contact are in contact, as provided in an embodiment of this application. Figure 12 Taking the orientation of the stationary contact 200 as an example, the line A connecting the center of the second rotating shaft and the center of the stationary contact, and the extension line B of the stationary contact near the moving contact assembly towards the second rotating shaft, can form a fan-shaped gap.

[0125] When the projection of the second rotating shaft 350 in the first direction OX lies on the line connecting the center 210 of the stationary contact and the center of the third rotating shaft 360, the presence of this sector-shaped gap can reduce the problem of interference between the remaining components in the double-break circuit breaker and the operating mechanism 300 after the moving contact and the stationary contact have made contact. This allows the operating mechanism 300 to continue rotating clockwise. This improves the reliability of the operating mechanism 300, and thus improves the reliability of the double-break circuit breaker. The first direction OX can be the arrangement direction of the second rotating shaft 350 and the first rotating shaft 340.

Claims

1. A double-break circuit breaker, characterized in that, include: The casing has an internal installation space. A stationary contact is disposed within the installation space; An operating mechanism is disposed within the installation space and located on one side of the stationary contact. The operating mechanism includes a support, a contact support, and a moving contact assembly. The moving contact assembly includes a moving contact and a contact bracket. The moving contact includes a first moving contact and a second moving contact. The end of the first moving contact away from the moving contact point and the end of the second moving contact away from the moving contact point are connected by a connecting plate. The connecting plate is connected to the contact bracket by a rotating shaft, which is parallel to the moving contact. The support is rotatably connected to the housing via a first rotating shaft, the contact support is rotatably connected to the housing via a second rotating shaft, the contact support abuts against the support, the contact bracket is connected to the contact support via a third rotating shaft, a torsion spring is sleeved on the third rotating shaft, one end of the torsion spring abuts against the contact support, and the other end of the torsion spring abuts against the moving contact assembly; When the circuit is closed, the support rotates around the first rotating shaft, causing the contact support to rotate around the axis of the second rotating shaft, so that the moving contact assembly moves closer to the stationary contact. After the moving contact assembly comes into contact with the stationary contact, the moving contact rotates around the axis of the rotating shaft. The contact supports and drives the third rotating shaft to continue rotating closer to the stationary contact. The moving contact assembly rotates around the axis of the third rotating shaft towards the stationary contact.

2. The double-break circuit breaker according to claim 1, characterized in that, The support member is provided with a pushing surface, which is a plane; The contact support is provided with a force-bearing surface, which is an arc surface; The pushing surface and the force-bearing surface are in constant contact.

3. The double-break circuit breaker according to claim 1, characterized in that, The support member is provided with a first clearance hole, and the second rotating shaft passes through the first clearance hole. The first clearance hole is used to make way for the second rotating shaft. The contact support is provided with a second clearance hole, through which the first rotating shaft passes. The second clearance hole is used to make way for the first rotating shaft.

4. The double-break circuit breaker according to claim 1, characterized in that, The contact support has a dome on the side near the contact support, and the dome and the contact support are in constant contact.

5. The double-break circuit breaker according to claim 1, characterized in that, The contact support has a protrusion on the side facing the stationary contact; The dual-break circuit breaker also includes a tripping element, which is arranged parallel to the stationary contact. The tripping component pushes against the protrusion, causing the contact bracket to move away from the stationary contact.

6. The double-break circuit breaker according to claim 1, characterized in that, It also includes a metal component and a thermal release lever, with the operating mechanism located between the metal component and the stationary contact; The operating mechanism is linked to the metal part via a thermal release rod; The contact support is equipped with a baffle that blocks the thermal release rod.

7. The double-break circuit breaker according to claim 1, characterized in that, The dual-break circuit breaker is also equipped with an arc-starting plate. The arc-initiating plate is provided with an arc-initiating end, which is close to the moving contact assembly.

8. The double-break circuit breaker according to claim 7, characterized in that, The moving contact is provided with an arc-shaped running track, which is located between the moving contact point and the arc-initiating end of the moving contact.

9. The double-break circuit breaker according to any one of claims 4-8, characterized in that, The operating mechanism also includes a reset spring; One end of the reset spring is connected to the third rotating shaft, and the other end of the reset spring is connected to the fixed structure inside the housing.

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