Permanent magnet operating mechanism and circuit breaker

Abstract

The invention provides a permanent magnet operating mechanism and a circuit breaker. The permanent magnet operating mechanism comprises a bottom plate; the static iron core set is arranged on the bottom plate, a first groove is formed in the upper portion of the static iron core set, a second groove is formed in the lower portion of the static iron core set, and a third groove is formed in the middle of the static iron core set; the movable iron core is arranged right above the static iron core group, the lower part of the movable iron core is provided with a fourth groove, and the middle part of the movable iron core is provided with a fifth groove; the permanent magnets are uniformly arranged in the second grooves; the operation coil is arranged in a cavity formed by the first groove and the fourth groove, and the operation coil is electrically connected with the control power supply; the opening spring is arranged in a cavity formed by the third groove and the fifth groove; the top plate is arranged above the movable iron core; the permanent magnet operating mechanism provided by the invention is convenient and simple to install and long in service life, and normal operation of the whole mechanism is not affected by damage of a single permanent magnet.

Description

Technical Field

[0001] The present application relates to, but is not limited to, the technical field of vacuum circuit breakers, and in particular to a permanent magnetic operating mechanism and a circuit breaker. Background Art

[0002] At present, the circuit breaker operating mechanism of 10kV gas-filled cabinet generally adopts a spring operating mechanism or a permanent magnet operating mechanism.

[0003] If a spring operating mechanism is used, it is composed of about 200 parts. The parts processing is cumbersome, the process requirements are high, the transmission structure is complex, and the failure rate is high. According to data, 70% of the failures of power switchgear are due to mechanical failures of the spring operating mechanism. Under the development trend of long life and maintenance-free, it has gradually failed to meet the needs of maintenance-free and intelligent power grid construction; if a permanent magnet operating mechanism is used, most of them are integrated operating mechanisms, in which a permanent magnet operating mechanism controls the closing and opening of the three-phase vacuum interrupter. Its transmission system is composed of multi-stage crank arms, with large stroke loss and complex structure. It is exposed to the outside of the gas box and is easily affected by environmental pollution. When the dynamic and static iron cores of the mechanism begin to rust, the residual holding force of the mechanism will gradually decrease, posing a safety hazard.

[0004] The current permanent magnet operating mechanism has an annular integrated permanent magnet. Due to its inherent magnetism, the permanent magnet is easily attracted to the static iron core during assembly, and the magnetic force is large. Once attracted, it is difficult to separate it, making it difficult to install the permanent magnet in the required position, seriously affecting production progress. Summary of the Invention

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] The embodiments of the present application provide a permanent magnet operating mechanism and a circuit breaker, which are easy and simple to install and have a long service life. Damage to a single permanent magnet will not affect the normal operation of the entire mechanism.

[0007] To achieve the above-mentioned purpose, the first aspect of the embodiment of the present application proposes a permanent magnet operating mechanism, comprising: a base plate; a static iron core group, arranged on the base plate, a first groove is provided on the upper part of the static iron core group, a second groove is provided on the lower part of the static iron core group, a third groove is provided in the middle part of the static iron core group, the static iron core group as a whole, the first groove and the second groove are all annular columnar, and the third groove is cylindrical; a moving iron core, arranged directly above the static iron core group, a fourth groove is provided on the lower part of the moving iron core, a fifth groove is provided in the middle part of the moving iron core, the cross section of the fourth groove is exactly the same as that of the first groove, and the fourth groove is located at Directly above the first groove, the cross-section of the fifth groove is exactly the same as that of the third groove, and the fifth groove is located directly above the third groove; a plurality of permanent magnets, the permanent magnets are in a toothed shape, and the permanent magnets are evenly arranged in the second groove; an operating coil, which is arranged in a cavity formed by the first groove and the fourth groove, and the operating coil is electrically connected to the control power supply; a trip spring, which is arranged in a cavity formed by the third groove and the fifth groove, the upper part of the trip spring is in close contact with the moving iron core, and the lower part is in close contact with the static iron core group, and the trip spring is used to provide elastic force during tripping; a top plate, which is arranged above the moving iron core.

[0008] In some embodiments, the static iron core group includes a first static iron core and a second static iron core, the first static iron core includes a first boss and a second boss, the first boss is arranged above the second boss, the second static iron core, the first boss and the second boss are all in the shape of a circular column, the first static iron core is arranged in the second static iron core, the outer surface of the first boss and the inner surface of the second static iron core form the first groove, and the outer surface of the second boss and the inner surface of the second static iron core form the second groove.

[0009] In some embodiments, the operating coil includes a skeleton and a winding, the skeleton is fixed on the first static iron core, the winding is wrapped around the side surface of the skeleton, and the winding is electrically connected to the control power supply.

[0010] In some embodiments, a sixth groove is further provided on the moving iron core, and the sixth groove is provided on the upper surface of the fifth groove. The diameter of the cross section of the sixth groove is smaller than the diameter of the cross section of the fifth groove. The permanent magnetic operating mechanism also includes an overtravel spring, and the overtravel spring is provided in a cavity formed by the sixth groove, the fifth groove and the third groove. The upper part of the overtravel spring is in close contact with the moving iron core, and the lower part is in close contact with the static iron core group.

[0011] In some embodiments, a support mounting hole is provided on the bottom plate, a support hole is provided on the top plate, and the permanent magnet operating mechanism further includes a support rod, which passes through the support mounting hole on the bottom plate and the support hole on the top plate in sequence to fix the bottom plate and the top plate, and the length of the support rod is equal to the sum of the height of the static iron core group, the height of the moving iron core, and the stroke of the moving iron core.

[0012] In some embodiments, the permanent magnet operating mechanism also includes an operating rod, which passes through the center of the static iron core group, the center of the moving iron core and the top plate from bottom to top, the upper part of the operating rod is fixedly connected to the moving iron core, and the lower part of the operating rod is provided with a guide sleeve, the inner surface of the guide sleeve is in close contact with the operating rod, and the guide sleeve is fixedly connected to the static iron core group.

[0013] In some embodiments, a drive hole groove is also provided on the top plate, and the drive hole groove is used to install a drive plate. The upper part of the operating rod passes through the drive plate, and the drive plate is fixedly connected to the moving iron core. Manual drive holes are provided on both sides of the drive plate, and the manual drive holes are used to install a manual shaft. The manual shaft is used to receive external force to control the stroke of the moving iron core.

[0014] In some embodiments, the permanent magnet operating mechanism also includes side plates, which are arranged on the side surfaces of the moving iron core and the static iron core group, and the top plate, the side plate and the bottom plate wrap the static iron core group and the moving iron core, and the top plate, the side plate and the bottom plate are all made of magnetic insulation material.

[0015] In some embodiments, folded edges are vertically arranged around the four sides of the top plate.

[0016] In addition, to achieve the above-mentioned purpose, a second aspect of an embodiment of the present application proposes a circuit breaker, which includes the permanent magnetic operating mechanism described in the first aspect.

[0017] According to the solution provided in the embodiment of the present application, the bottom plate, the static iron core group, the moving iron core, the operating coil and the permanent magnet are respectively symmetrical with the third groove and the fifth groove as the center, and the vector sum of the positions of each component relative to its center is equal to zero, which is beneficial to the impact mechanical balance caused by the closing and opening of the permanent magnetic operating mechanism. The forces on each component are uniform, which can effectively ensure the linearity of the movement of the moving parts in the permanent magnetic operating mechanism and effectively improve the overall life of the mechanism, so that the service life of the permanent magnetic operating mechanism can reach more than 20,000 times; with the third groove as the center, the permanent magnet is evenly fixed in the second groove of the static iron core group, which can make the permanent magnet more convenient Assembling them into the static iron core group reduces the difficulty of assembly, thereby reducing the difficulty of production. In addition, the decentralized permanent magnet structure can grid the permanent magnets, greatly reducing the magnetic attraction between the permanent magnets and the static iron core during assembly. Small permanent magnets are easier to install into the static iron core group, and the installation flexibility is high, which greatly improves the assembly efficiency. Each permanent magnet is independent of each other. If one of the permanent magnets rusts, the rust will not affect the other permanent magnets. Therefore, the rust of some permanent magnets will not affect the overall magnetic field distribution of the permanent magnet operating mechanism, thereby ensuring the overall magnetic attraction retention of the permanent magnet operating mechanism and making the permanent magnet operating mechanism more reliable.

[0018] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purposes and other advantages of the present application can be achieved and obtained through the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0020] Figure 1 A schematic diagram of an optional structure of the permanent magnetic operating mechanism provided in an embodiment of the present application; Figure 2 A schematic diagram of another optional structure of the permanent magnetic operating mechanism provided in an embodiment of the present application; Figure 3 A schematic diagram of another optional structure of the permanent magnetic operating mechanism provided in an embodiment of the present application; Figure 4 A schematic diagram of another optional structure of the permanent magnetic operating mechanism provided in an embodiment of the present application; Figure 5 A schematic diagram of an optional structure of the first static iron core provided in an embodiment of the present application; Figure 6 A schematic diagram of an optional structure of the second static iron core provided in an embodiment of the present application; Figure 7 A schematic diagram of an optional structure of the moving iron core provided in an embodiment of the present application; Figure 8 A schematic diagram of an optional structure of a top plate provided in an embodiment of the present application; Figure 9 A schematic diagram of an optional structure of the base plate provided in an embodiment of the present application; Figure 10 A schematic diagram of another optional structure of the permanent magnetic operating mechanism provided in an embodiment of the present application; Figure 11 This is a schematic diagram of an optional structure of the operating lever provided in an embodiment of the present application; Figure 12 This is a schematic diagram of an optional structure of the driver board provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] This section will describe the specific embodiments of the present application in detail. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0022] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are 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, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0023] In the description of this application, "several" means one or more, "more" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0024] In the description of this application, unless otherwise clearly defined, terms such as setting, installation, and electrical connection should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0025] The current permanent magnet operating mechanism has an annular integrated permanent magnet. Due to its inherent magnetism, the permanent magnet is easily attracted to the static iron core during assembly, and the magnetic force is large. Once attracted, it is difficult to separate it, making it difficult to install the permanent magnet in the required position, seriously affecting production progress.

[0026] In response to the problem of difficulty in installing an integrated permanent magnet, the present application provides a permanent magnet operating mechanism and a circuit breaker, which includes: a base plate; a static iron core group, which is arranged on the base plate, a first groove is provided on the upper part of the static iron core group, a second groove is provided on the lower part of the static iron core group, and a third groove is provided in the middle part of the static iron core group, the static iron core group as a whole, the first groove and the second groove are all in the shape of a circular cylinder, and the third groove is in the shape of a cylinder; a moving iron core, which is arranged directly above the static iron core group, a fourth groove is provided on the lower part of the moving iron core, and a fifth groove is provided in the middle part of the moving iron core, and the cross section of the fourth groove is completely consistent with that of the first groove. All the same, the fourth groove is located directly above the first groove, the cross section of the fifth groove is exactly the same as the third groove, and the fifth groove is located directly above the third groove; multiple permanent magnets, the permanent magnets are in a meshing shape, and the permanent magnets are evenly arranged in the second groove; the operating coil is arranged in the cavity formed by the first groove and the fourth groove, and the operating coil is electrically connected to the control power supply; the trip spring is arranged in the cavity formed by the third groove and the fifth groove, the upper part of the trip spring is in close contact with the moving iron core, and the lower part is in close contact with the static iron core group, and the trip spring is used to provide elastic force when the trip is performed; the top plate is arranged above the moving iron core. According to the solution provided in the embodiment of the present application, the installation is convenient and simple, the service life is long, and the damage of a single permanent magnet will not affect the normal operation of the entire mechanism.

[0027] The permanent magnetic operating mechanism and circuit breaker provided in the embodiments of the present application are specifically described through the following embodiments. First, the permanent magnetic operating mechanism in the embodiments of the present application is described.

[0028] The embodiments of the present application are further described below with reference to the accompanying drawings.

[0029] Reference Figures 1 to 4 One embodiment of the present application provides a permanent magnetic operating mechanism, comprising: bottom plate 110; The static iron core assembly 200 is disposed on the bottom plate 110. A first groove 230 is provided at the upper portion of the static iron core assembly 200, a second groove 240 is provided at the lower portion of the static iron core assembly 200, and a third groove 250 is provided at the middle portion of the static iron core assembly 200. The static iron core assembly 200 as a whole, the first groove 230, and the second groove 240 are all annular and cylindrical, and the third groove 250 is cylindrical; The movable iron core 300 is disposed directly above the static iron core assembly 200. A fourth groove 310 is provided at the lower portion of the movable iron core 300, and a fifth groove 320 is provided at the middle portion of the movable iron core 300. The cross-section of the fourth groove 310 is identical to that of the first groove 230, and the fourth groove 310 is located directly above the first groove 230. The cross-section of the fifth groove 320 is identical to that of the third groove 250, and the fifth groove 320 is located directly above the third groove 250. A plurality of permanent magnets 400 , each of which is in a toothed shape and is evenly arranged in the second groove 240 ; The operating coil 500 is disposed in the cavity formed by the first groove 230 and the fourth groove 310, and the operating coil 500 is electrically connected to the control power supply; The trip spring 610 is disposed in the cavity formed by the third groove 250 and the fifth groove 320. The upper portion of the trip spring 610 is in close contact with the movable iron core 300, and the lower portion is in close contact with the static iron core assembly 200. The trip spring 610 is used to provide elastic force when the switch is opened; The top plate 120 is disposed above the moving iron core 300 .

[0030] It can be understood that when the permanent magnet operating mechanism controls the closing, the control power supply passes positive direct current to the operating coil 500, driving the moving iron core 300 to move toward the static iron core group 200, and at the same time compressing the opening spring 610 to store energy in the opening spring 610. After the closing is completed, the lower end face of the moving iron core 300 fits with the upper end face of the static iron core group 200, and a closed magnetic circuit is formed between the moving iron core 300 and the static iron core group 200. The combined magnetic field generated by the permanent magnet 400 and the operating coil 500 provides the permanent magnet operating mechanism with a magnetic field. Provide holding force; when the permanent magnetic operating mechanism controls the opening, the control power supply passes reverse DC power to the operating coil 500. At this time, the reverse magnetic field generated by the operating coil 500 demagnetizes the closed magnetic circuit between the moving iron core 300 and the static iron core group 200. When the holding force of the permanent magnetic operating mechanism is not enough to resist the elastic force of the opening spring 610, the moving iron core 300 begins to move upward under the thrust of the opening spring 610, realizing the opening of the permanent magnetic operating mechanism. The stroke and position of the opening are maintained by the pre-compression force of the opening spring 610.

[0031] The base plate 110, the static iron core group 200, the moving iron core 300, the operating coil 500 and the permanent magnet 400 are symmetrical with the third groove 250 and the fifth groove 320 as the center respectively. The vector sum of the positions of each component relative to its center is equal to zero, which is conducive to the impact mechanical balance caused by the closing and opening of the permanent magnetic operating mechanism. The various components are evenly stressed, which can effectively ensure the linearity of the movement of the moving components in the permanent magnetic operating mechanism and effectively improve the overall life of the mechanism, so that the service life of the permanent magnetic operating mechanism can reach more than 20,000 times.

[0032] With the third groove 250 as the center, the permanent magnet 400 is evenly fixed in the second groove 240 of the static iron core group 200, which makes it easier to assemble the permanent magnet 400 into the static iron core group 200, reducing the difficulty of assembly and thus reducing the difficulty of production; in addition, the distributed permanent magnet 400 structure can grid the permanent magnet 400, greatly reducing the magnetic attraction between the permanent magnet 400 and the static iron core during assembly, and each small permanent magnet 400 is easier to install into the static iron core group 200, with high installation flexibility, greatly improving assembly efficiency; each permanent magnet 400 is independent of each other, and if one of the permanent magnets 400 rusts, the rust will not affect other permanent magnets 400, so the rust of some permanent magnets 400 will not affect the overall magnetic field distribution of the permanent magnet operating mechanism, thereby ensuring the overall magnetic attraction holding force of the permanent magnet operating mechanism and making the permanent magnet operating mechanism more reliable.

[0033] In addition, refer to Figure 5 and Figure 6 As shown, in some embodiments of the present application, the static iron core group 200 includes a first static iron core 210 and a second static iron core 220, the first static iron core 210 includes a first boss 211 and a second boss 212, the first boss 211 is arranged above the second boss 212, the second static iron core 220, the first boss 211 and the second boss 212 are all annular columnar, the first static iron core 210 is arranged in the second static iron core 220, the outer surface of the first boss 211 and the inner surface of the second static iron core 220 form a first groove 230, and the outer surface of the second boss 212 and the inner surface of the second static iron core 220 form a second groove 240.

[0034] Dividing the static iron core assembly 200 into two independent parts, forming a first static iron core 210 and a second static iron core 220, improves the fault tolerance during assembly. Therefore, by adopting a dual static iron core structure, combined with a distributed permanent magnet 400 structure, the permanent magnet 400 can be more conveniently assembled into the static iron core assembly 200, reducing the difficulty of assembly and thus reducing the difficulty of production. When the moving iron core 300 collides with the static iron core assembly 200, the first static iron core 210 and the second static iron core 220 share the collision impact between the moving iron core 300 and the static iron core assembly 200, thereby improving the service life of the static iron core assembly 200.

[0035] The operating coil 500 is arranged in the first groove 230, the inner surface of the operating coil 500 is tightly attached to the outer surface of the first boss 211, and the outer surface of the operating coil 500 is tightly attached to the inner surface of the second static iron core 220. The permanent magnet 400 is arranged in the second groove 240, one side of the permanent magnet 400 is tightly attached to the outer surface of the second boss 212, and the other side of the permanent magnet 400 is tightly attached to the inner surface of the second static iron core 220. The opening spring 610 is arranged in the third groove 250, and the outer surface of the opening spring 610 is tightly attached to the inner surface of the first boss 211.

[0036] In one specific embodiment, the operating coil 500 includes a frame and a winding. The frame is fixed to the first static iron core 210, and the winding is wrapped around the side surface of the frame and electrically connected to the control power supply. The cross-sectional area of the second boss 212 is larger than that of the first boss 211. The portion of the second boss 212 protruding from the first boss 211 is provided with a screw hole, and the frame is fixed to the second boss 212 via a screw rod that engages the screw hole.

[0037] In addition, refer to Figure 2 、 Figure 3 and Figure 7 As shown, in some embodiments of the present application, a sixth groove 330 is further provided on the moving iron core 300, and the sixth groove 330 is provided on the upper surface of the fifth groove 320. The diameter of the cross section of the sixth groove 330 is smaller than the diameter of the cross section of the fifth groove 320. The permanent magnetic operating mechanism also includes an overtravel spring 620, and the overtravel spring 620 is provided in a chamber formed by the sixth groove 330, the fifth groove 320 and the third groove 250. The upper part of the overtravel spring 620 is in close contact with the moving iron core 300, and the lower part is in close contact with the static iron core group 200.

[0038] In the fifth groove 320 of the moving iron core 300, another cylindrical piece is removed upward from the upper surface of the fifth groove 320 to obtain the sixth groove 330. At this time, the middle part of the moving iron core 300 includes a first end face 301 and a second end face 302. The first end face 301 is the top surface of the fifth groove 320, and the second end face 302 is the top surface of the sixth groove 330. When the moving iron core 300 is engaged with the static iron core group 200, the height of the second end face 302 is greater than the height of the first end face 301, and the cross-sectional diameter of the second end face 302 is smaller than the cross-sectional diameter of the first end face 301. An overtravel spring 620 is arranged in the sixth groove 330. The cross-sectional diameter of the trip spring 610 is equal to the cross-sectional diameter of the first end face 301. The top surface of the trip spring 610 contacts the first end face 301. The cross-sectional diameter of the overtravel spring 620 is equal to the cross-sectional diameter of the second end face 302. The top surface of the overtravel spring 620 contacts the second end face 302.

[0039] The overtravel spring 620 is placed inside the opening spring 610 and is used to provide an overtravel force for the external contact blade when closing. When the permanent magnetic operating mechanism is closed, the overtravel spring 620 provides the necessary contact pressure for the contacts to ensure that the contacts can be in close contact when closed, reduce contact resistance, prevent overheating, and improve conductivity; when the permanent magnetic operating mechanism is opening, the overtravel spring 620 can absorb the kinetic energy of the moving iron core 300, reduce the bouncing of the moving iron core 300 on the static iron core group 200, and improve the reliability and speed of opening.

[0040] In addition, refer to Figures 8 to 10 As shown, in some embodiments of the present application, a support mounting hole 117 is provided on the base plate 110, and a support hole 125 is provided on the top plate 120. The permanent magnet operating mechanism also includes a support rod 140, which passes through the support mounting hole 117 on the base plate 110 and the support hole 125 on the top plate 120 in sequence to fix the base plate 110 and the top plate 120. The length of the support rod 140 is equal to the sum of the height of the static iron core group 200, the height of the moving iron core 300 and the stroke of the moving iron core 300.

[0041] The support holes 125 on the bottom plate 110 are aligned with the support holes 125 on the top plate 120 and are located at their respective four corners. The support rods 140 fix the distance between the top plate 120 and the bottom plate 110. When the moving iron core 300 moves upward, the top surface of the moving iron core 300 contacts the top plate 120. When the moving iron core 300 moves downward, there is a gap between the top surface of the moving iron core 300 and the top plate 120.

[0042] In addition, a shaft sleeve 126 is provided on the top plate 120, and a guide hole is correspondingly provided on the moving iron core 300. The guide rod 127 is fixed on the shaft sleeve 126 and passes through the guide hole. The guide rod 127 is perpendicular to the top plate 120 and the moving iron core 300. The length of the guide rod 127 is slightly smaller than the distance between the top plate 120 and the top of the operating coil 500. When the moving iron core 300 moves upward or downward, the guide rod 127 limits the displacement of the moving iron core 300, limiting the moving iron core 300 to move only in the vertical direction, thereby preventing the moving iron core 300 from rotating.

[0043] In addition, refer to Figure 3 and Figure 11 As shown, in some embodiments of the present application, the permanent magnet operating mechanism also includes an operating rod 700, which passes through the center of the static iron core group 200, the center of the moving iron core 300 and the top plate 120 from bottom to top. The upper part of the operating rod 700 is fixedly connected to the moving iron core 300, and the lower part of the operating rod 700 is provided with a guide sleeve 111. The inner surface of the guide sleeve 111 is in close contact with the operating rod 700, and the guide sleeve 111 is fixedly connected to the static iron core group 200.

[0044] The guide sleeve 111 is cylindrical and is fixed to the base plate 110 by screws. It is used to limit the displacement stroke of the lower part of the operating rod 700 so that the operating rod 700 can move in a straight line when it moves up and down. When the permanent magnetic operating mechanism closes or opens the switch, the operating rod 700 slides up and down in the vertical direction along the guide sleeve 111; the guide sleeve 111 has a self-lubricating function and can lubricate the contact surface between itself and the operating rod 700, thereby reducing the friction between the operating rod 700 and reducing the wear of the operating rod 700 caused by friction during movement.

[0045] In a specific embodiment, the upper part of the operating rod 700 can be divided into a first column 701 and a second column 702 with two different diameters, the first column 701 is on the top, and the second column 702 is on the bottom. The diameter of the first column 701 is smaller than that of the second column 702, and the second column 702 is located in the third groove 250. The first column 701 passes through the top plate 120 upward, the overtravel spring 620 is sleeved on the first column 701, and the trip spring 610 is sleeved on the second column 702. When the permanent magnetic operating mechanism is closed, the moving iron core 300 pushes downward and compresses the overtravel spring 620 and the trip spring 610 at the same time, thereby driving the operating rod 700 to extend downward. When the permanent magnetic operating mechanism is opened, the moving iron core 300 moves upward, and the overtravel spring 620 and the trip spring 610 release the elastic force, thereby causing the operating rod 700 to retract upward.

[0046] Refer again Figure 8 As shown, in some embodiments of the present application, a driving hole groove 121 is further provided on the top plate 120, and the driving hole groove 121 is used to install a driving plate 122. The upper part of the operating rod 700 passes through the driving plate 122, and the driving plate 122 is fixedly connected to the moving iron core 300. Manual driving holes 123 are provided on both sides of the driving plate 122. The manual driving holes 123 are used to install a manual shaft, and the manual shaft is used to receive external force to control the stroke of the moving iron core 300.

[0047] Reference Figure 12 As shown, ears are vertically provided at both ends of the driving plate 122, and manual separation driving holes 123 are respectively provided on the two vertical ears. As the moving iron core 300 moves up and down, the driving plate 122 is displaced accordingly. By installing a manual separation shaft (not shown in the figure) on the manual separation driving hole 123, the external mechanical component drives the manual separation shaft. When the mechanical component drives the manual separation shaft downward, the moving iron core 300 is forced to be pushed toward the static iron core group 200, so that the permanent magnetic operating mechanism is forced to complete the closing. Alternatively, the mechanical component can also drive the manual separation shaft upward, and the moving iron core 300 is forced to be pulled upward, and the moving iron core 300 and the static iron core group 200 are forced to be separated, so that the permanent magnetic operating mechanism is forced to complete the opening.

[0048] In some embodiments of the present application, the permanent magnet operating mechanism also includes a side plate 130, which is arranged on the side surface of the moving iron core 300 and the static iron core group 200, and the top plate 120, the side plate 130 and the bottom plate 110 wrap the static iron core group 200 and the moving iron core 300, and the top plate 120, the side plate 130 and the bottom plate 110 are all made of magnetic insulation material.

[0049] Specifically, the upper part of the side panel 130 is fixedly connected to the top panel 120, and the lower part is fixedly connected to the bottom panel 110. The top panel 120, the side panel 130 and the bottom panel 110 together constitute a closed wrapping structure. The top panel 120, the side panel 130 and the bottom panel 110 are all made of magnetic insulation materials, which can prevent the leakage of the magnetic field, provide limitation and guidance for the internal magnetic field of the moving iron core 300 and the static iron core group 200, reduce the interference of the external magnetic field, and ensure the stability and concentration of the magnetic field.

[0050] Refer again Figure 9 As shown, the bottom plate 110 is provided with a central through hole 112, a guide mounting hole 113, a first static iron mounting hole 114, a coil mounting hole 115, a second static iron mounting hole 116 and a support mounting hole 117 from the inside to the outside. The guide mounting hole 113 is used to install a guide sleeve 111. The guide sleeve 111 limits the stroke of the operating rod 700. The operating rod 700 passes downward through the central through hole 112 and is connected to the external connection contact. The permanent magnet operating mechanism transmits the stroke of the moving iron core 300 to the connection contact through the operating rod 700, thereby controlling the opening and closing of the contact. circuit or open circuit; the first static iron mounting hole 114 is used to fix the second boss 212 in the first static iron core 210, and the operating coil 500 is mounted on the second boss 212. The operating coil 500 has an outward protrusion relative to the second boss 212, and there is a gap between the distributed permanent magnets 400. The screw passes through the gap between the coil mounting hole 115 and the permanent magnet 400 in turn to fix the operating coil 500; the second static iron mounting hole 116 and the support mounting hole 117 are used to fix the second static iron core 220 and the support rod 140 respectively.

[0051] Anti-rotation screw holes 131 are provided on the side plate 130 and the second static iron core 220 . The side plate 130 and the second static iron core 220 are fixed via the anti-rotation screw holes 131 and corresponding screws, thereby preventing the side plate 130 from rotating relative to the second static iron core 220 .

[0052] In addition, in a specific embodiment, folded edges 124 are vertically arranged around the top plate 120. The folded edges 124 act as reinforcing ribs on the top plate 120, significantly improving the local strength and rigidity of the structure, effectively reducing stress concentration on the top plate 120, and improving the stability and overall structural strength of the permanent magnetic operating mechanism.

[0053] In addition, an embodiment of the present application further provides a circuit breaker, which includes the permanent magnetic operating mechanism in the above embodiment.

[0054] The above-mentioned circuit breaker and permanent magnetic operating mechanism are based on the same inventive concept. The detailed principle of the above-mentioned circuit breaker can be found in the above explanation of the permanent magnetic operating mechanism. The specific implementation of the circuit breaker is basically the same as the specific embodiment of the above-mentioned permanent magnetic operating mechanism, and will not be repeated here.

[0055] The embodiments described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0056] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0057] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present invention should be within the scope of the present invention.

Claims

1. A permanent magnet operating mechanism, characterized in that: include: base plate; A static iron core group is arranged on the bottom plate, a first groove is arranged on the upper portion of the static iron core group, a second groove is arranged on the lower portion of the static iron core group, and a third groove is arranged in the middle portion of the static iron core group. The static iron core group as a whole, the first groove and the second groove are all annular and cylindrical, and the third groove is cylindrical; A moving iron core is arranged directly above the static iron core group, a fourth groove is provided at the lower portion of the moving iron core, and a fifth groove is provided at the middle portion of the moving iron core, the cross section of the fourth groove is identical to that of the first groove, the fourth groove is located directly above the first groove, the cross section of the fifth groove is identical to that of the third groove, and the fifth groove is located directly above the third groove; a plurality of permanent magnets, each of which is in a toothed shape and is evenly arranged in the second groove; an operating coil disposed in a cavity formed by the first groove and the fourth groove, the operating coil being electrically connected to a control power supply; A trip spring is disposed in the cavity formed by the third groove and the fifth groove, the upper portion of the trip spring being in close contact with the moving iron core, and the lower portion being in close contact with the static iron core assembly, and the trip spring is used to provide elastic force when the switch is opened; A top plate is arranged above the moving iron core.

2. The permanent magnetic operating mechanism according to claim 1, characterized in that: The static iron core group includes a first static iron core and a second static iron core, the first static iron core includes a first boss and a second boss, the first boss is arranged above the second boss, the second static iron core, the first boss and the second boss are all in the shape of a circular column, the first static iron core is arranged in the second static iron core, the outer surface of the first boss and the inner surface of the second static iron core form the first groove, and the outer surface of the second boss and the inner surface of the second static iron core form the second groove.

3. The permanent magnetic operating mechanism according to claim 2, characterized in that: The operating coil includes a frame and a winding, the frame is fixed on the first static iron core, the winding is wrapped around the side surface of the frame, and the winding is electrically connected to the control power supply.

4. The permanent magnetic operating mechanism according to claim 1, characterized in that: A sixth groove is also provided on the moving iron core, and the sixth groove is provided on the upper surface of the fifth groove. The diameter of the cross section of the sixth groove is smaller than the diameter of the cross section of the fifth groove. The permanent magnetic operating mechanism also includes an overtravel spring, and the overtravel spring is provided in a cavity formed by the sixth groove, the fifth groove and the third groove. The upper part of the overtravel spring is in close contact with the moving iron core, and the lower part is in close contact with the static iron core group.

5. The permanent magnetic operating mechanism according to claim 1, characterized in that: A support mounting hole is provided on the bottom plate, and a support hole is provided on the top plate. The permanent magnetic operating mechanism also includes a support rod, which passes through the support mounting hole on the bottom plate and the support hole on the top plate in sequence to fix the bottom plate and the top plate. The length of the support rod is equal to the sum of the height of the static iron core group, the height of the moving iron core and the stroke of the moving iron core.

6. The permanent magnetic operating mechanism according to claim 1, characterized in that: The permanent magnet operating mechanism also includes an operating rod, which passes through the center of the static iron core group, the center of the moving iron core and the top plate from bottom to top. The upper part of the operating rod is fixedly connected to the moving iron core. The lower part of the operating rod is provided with a guide sleeve. The inner surface of the guide sleeve is in close contact with the operating rod, and the guide sleeve is fixedly connected to the static iron core group.

7. The permanent magnetic operating mechanism according to claim 6, characterized in that: A driving hole groove is also provided on the top plate, and the driving hole groove is used to install the driving plate. The upper part of the operating rod passes through the driving plate, and the driving plate is fixedly connected to the moving iron core. Manual driving holes are provided on both sides of the driving plate, and the manual driving holes are used to install the manual shaft. The manual shaft is used to receive external force to control the stroke of the moving iron core.

8. The permanent magnetic operating mechanism according to claim 1, characterized in that: The permanent magnet operating mechanism also includes side plates, which are arranged on the side surfaces of the moving iron core and the static iron core group. The top plate, the side plate and the bottom plate wrap the static iron core group and the moving iron core. The top plate, the side plate and the bottom plate are all made of magnetic insulation material.

9. The permanent magnetic operating mechanism according to claim 1, characterized in that: Folding edges are vertically arranged around the top plate.

10. A circuit breaker, characterized in that: The circuit breaker includes the permanent magnetic operating mechanism according to any one of claims 1 to 9.

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