A magnetron switch

Abstract

The application provides a magnetic control switch and belongs to the field of high-voltage switch devices. The magnetic control switch comprises a frame, a manual opening mechanism arranged on the frame and a transmission rod penetrating through the frame. A floating support assembly for providing radial support for the transmission rod is arranged on the frame. The position of the transmission rod for cooperating with the floating support assembly is between the position of the transmission rod for connecting with the manual opening mechanism and the position of the transmission rod for fixing a moving iron core. The floating support assembly comprises an annular mounting frame and an elastic assembly arranged on the mounting frame. A gap is left between the inner side of the mounting frame and the transmission rod. The elastic assembly comprises a rolling ball rotatably mounted and an elastic body for elastically pushing the rolling ball so that the rolling ball keeps in close contact with the transmission rod. The magnetic control switch in the application provides elastic support for the transmission rod in the radial direction by using the floating support assembly, thereby reducing the probability of jamming and prolonging the service life.

Description

Technical Field

[0001] This invention belongs to the field of high-voltage switchgear, and in particular relates to a magnetically controlled switch. Background Technology

[0002] A magnetically controlled switch is a switching device that uses a magnetic control mechanism as its operating mechanism. It achieves switching on and off by using a magnetic field to drive changes in the properties of the magnetic material. Magnetically controlled switches are suitable for distribution network automation scenarios, especially for overhead lines or ground cable lines requiring frequent operation and high reliability. The magnetic control mechanism includes a moving iron core, a stationary iron core, a coil, and elastic elements, all made of semi-hard magnetic material. When the switch is closed, the magnetic holding force between the moving and stationary iron cores keeps the switch in the closed position without any mechanical interlocking. When opening, only a very small reverse current needs to be injected into the mechanism coil to demagnetize the mechanism, and the energy-storing elastic element enables rapid opening.

[0003] The magnetic switch transmits power through a transmission rod fixed to the moving iron core. The transmission rod is connected to the moving contact of the arc-extinguishing chamber via an insulated pull rod, which can drive the moving contact of the arc-extinguishing chamber to move. During use, the transmission rod is driven by electromagnetic force to make rapid linear reciprocating motion along its own axis. During the movement, it is necessary to keep the transmission rod precisely aligned with the stationary contact end of the arc-extinguishing chamber, and also to keep the moving iron core precisely aligned with the stationary iron core.

[0004] Precise alignment of the transmission rod with the stationary contact end of the arc-extinguishing chamber is crucial to prevent the moving contact of the arc-extinguishing chamber from jamming, which could lead to opening and closing failures. The precise alignment of the moving and stationary iron cores relies on the alignment of the transmission rod. If misalignment occurs, the moving and stationary iron cores may not be fully parallel and in contact during engagement, resulting in increased local air gaps, a sharp increase in magnetic reluctance, and an actual electromagnetic attraction force far lower than the design value. Poor alignment can also cause localized contact between the moving and stationary iron cores, increasing localized stress and leading to localized wear. The changes in iron core performance caused by localized wear and the resulting debris can further exacerbate the misalignment of the moving iron core, creating a vicious cycle.

[0005] To achieve the aforementioned alignment objective, traditional magnetic switches often incorporate a rigid guiding structure to guide and constrain the transmission rod. This rigid guiding structure demands high precision in the machining and assembly of components, and cannot tolerate large clearances. If the clearance is too large, significant lateral vibration can easily occur during rapid operation of the transmission rod, leading to abnormal noise and accelerated wear between the two mating parts. This further widens the clearance, creating a vicious cycle that severely impacts the lifespan of the magnetic switch. Increased clearance also consumes the useful work of the operating mechanism due to impacts and wear between the transmission rod and the rigid guiding structure, causing the contact speed to fail to meet the breaking requirements after a period of use. In equipment using magnetic switches, such as pole-mounted circuit breakers, which are often installed on outdoor utility poles and are difficult to maintain, a lifespan of 15-20 years with virtually no maintenance is generally required. Therefore, the lifespan of the magnetic switch is crucial for high-voltage switchgear.

[0006] The clearance between the rigid guide structure and the transmission rod cannot be too small. While reducing the clearance can alleviate the aforementioned lateral vibration problems, it also increases the precision requirements for machining, raising the manufacturing cost of the magnetic switch. Furthermore, it makes the transmission rod more prone to jamming or even seizing in practical applications. Specifically, the manual tripping mechanism of the magnetic switch exerts a lateral force on the transmission rod. When the clearance between the rigid guide structure and the transmission rod is extremely small, the transmission rod undergoes slight elastic deformation under the lateral force, making it difficult to pass through the rigid guide structure and causing jamming. Under the lateral force, stress concentration can also easily occur at the point where the transmission rod mates with the rigid guide structure. If the transmission rod is subjected to prolonged lateral force and undergoes slight plastic deformation at this location, it can directly jam the transmission rod with the rigid guide structure, significantly impacting the lifespan of the magnetic switch. Summary of the Invention

[0007] The purpose of this invention is to provide a magnetically controlled switch to solve the technical problem in the prior art where the use of a rigid guiding structure to guide and constrain the axial movement of the transmission rod affects the service life of the magnetically controlled switch.

[0008] To achieve the above objectives, the technical solution of the magnetically controlled switch provided by this invention is as follows: A magnetically controlled switch includes a frame, a manual tripping mechanism mounted on the frame, and a transmission rod passing through the frame. One end of the transmission rod is used to connect to a switch component, and the other end is used to connect to the manual tripping mechanism. A floating support assembly is provided on the frame to provide radial support for the transmission rod. The position where the transmission rod cooperates with the floating support assembly is between the position where the transmission rod is used to connect to the manual tripping mechanism and the position where the transmission rod is used to fix the moving iron core. The floating support assembly includes an annular mounting bracket and an elastic component arranged on the mounting bracket. A gap is left between the inner side of the mounting bracket and the transmission rod. The elastic component includes a rotatably mounted rolling ball and an elastic body for elastically pushing the rolling ball to keep the rolling ball in close contact with the transmission rod.

[0009] The beneficial effects are as follows: The magnetic switch provided by this invention is an improvement over existing technologies. This magnetic switch utilizes a floating support assembly to provide radial elastic support for the transmission rod. Under normal conditions, the upper end of the transmission rod can remain centered under the action of the floating support assembly. Compared to rigid guide structures, the rolling ball in the floating support assembly can always maintain contact with the transmission rod, thus ensuring that the transmission rod always receives radial support. Regardless of transmission rod misalignment or wear, the floating support assembly has lifelong self-adaptive capability. It not only eliminates the need for extreme machining and fitting precision but also prevents the transmission rod from entering a vicious cycle of wear-increased fit gap-further wear, thus extending the lifespan of the magnetic switch. The floating offset provided by the floating support assembly to the transmission rod results in a more uniform stress distribution, making it less prone to deformation due to long-term localized stress concentration, ensuring that it is not easily jammed even after long-term use.

[0010] As a further improvement, the mounting bracket includes a base ring and an adjusting cone sleeve. The base ring has a radially through mounting hole for inserting the elastic component. The adjusting cone sleeve is located radially outside the base ring and has an inner conical surface for controlling the elastic force of the elastic component on the transmission rod. The base ring is fixed relative to the frame, while the axial position of the adjusting cone sleeve relative to the frame is adjustable.

[0011] The beneficial effect is that after the axial position of the adjusting cone sleeve is changed, the contact position between its inner cone surface and each elastic component changes, thereby changing the initial compression of each elastic component and thus adjusting the elastic support force of the elastic component on the transmission rod. Adjusting the initial compression of the elastic component can obtain a suitable radial support force; otherwise, if the radial support force is too small, the transmission rod may not be effectively supported, while if the radial support force is too large, the resistance to manual tripping operation may increase.

[0012] As a further improvement, the frame is provided with a receiving groove for accommodating the mounting bracket, and the outer peripheral surface of the adjusting cone sleeve and the inner peripheral surface of the receiving groove are connected by a thread to make the position of the adjusting cone sleeve adjustable.

[0013] The beneficial effects are: the use of threads to adjust the position of the adjusting cone sleeve is convenient to operate and has high adjustment accuracy.

[0014] As a further improvement, an outward flange is provided on the outer side of the adjusting cone sleeve, and a mating hole is provided on the outward flange. A locking fastener is provided in the mating hole. After the locking fastener passes through the mating hole, it is tightened or pressed against the frame to lock the adjusting cone sleeve.

[0015] The beneficial effect is that the locking fastener can provide axial force to the adjusting cone sleeve, thereby increasing the contact pressure between the threads on the adjusting cone sleeve and the threads on the receiving groove, which in turn increases the relative static friction between the two, thus playing the role of locking and preventing disengagement.

[0016] As a further improvement, an inwardly turned-up edge is provided on the inner side of the adjusting cone sleeve, and a pressure spring is provided between one axial end face of the base ring and the frame surface, and the other end face and the inwardly turned-up edge, so as to keep the base ring in close contact with the frame.

[0017] The beneficial effects are: by using a pressure spring to keep the base ring fixed, the structure can be simplified on the one hand, eliminating the need for additional structures on the frame to fix the base ring, and on the other hand, the base ring has a certain amount of room for movement, allowing for adaptive adjustment during the adjustment of the cone sleeve position to prevent jamming.

[0018] As a further improvement, the adjusting cone sleeve includes an adjusting section with an inner conical surface and a limiting section with an inner cylindrical surface, and the base ring is provided with a mating cylindrical surface for engaging with the inner cylindrical surface of the limiting section.

[0019] The beneficial effect is that the adjusting cone sleeve has a radial limiting effect on the base ring, which can improve the stability of the base ring.

[0020] As a further improvement, the manual tripping mechanism includes a drive shaft that rotates with the frame, a handle fixed to the drive shaft and used for manual operation, a rocker arm fixed to the drive shaft, and a force transmission lever hinged to the frame. The power arm of the force transmission lever can rotate due to the swinging pressure of the rocker arm. The end of the resistance arm of the force transmission lever is hinged to the end of the transmission rod and used to pull the transmission rod axially during manual tripping. One of the force transmission levers and the hinge seat configured therewith is an elongated hole, and the other is a connecting shaft located in the elongated hole and capable of sliding and rotating with the elongated hole.

[0021] The beneficial effects are as follows: During the movement of the transmission rod, the distance between the fulcrum of the force transmission lever and the connection point changes. Therefore, designing the force transmission lever as movable avoids motion interference. Since the force transmission lever is movable, and it moves towards the transmission rod during manual braking, and the rocker arm contacts the power arm of the force transmission lever through its arc surface, a combination of rolling and sliding engagement is achieved between the rocker arm and the force transmission lever, resulting in less friction compared to a purely sliding engagement.

[0022] As a further improvement, the lever is a cam that contacts the power arm of the force transmission lever via an arcuate surface.

[0023] The beneficial effect is that during the rotation of the lever, there is a part of rolling contact between the lever and the power arm of the force transmission lever, and the contact process is continuous, making the contact force transmission more stable.

[0024] As a further improvement, the drive shaft is equipped with an elastic reset member for automatically resetting it after the opening operation, and is also equipped with a stop limit member for configuring with the elastic reset member to keep it at the reset angle. After the drive shaft is reset, the swing arm exits the swing range of the power arm of the force transmission lever.

[0025] The beneficial effect is that after a manual tripping operation, the operator only needs to release the hand-driven shaft to automatically reset it, without affecting subsequent closing operations. When the drive shaft is in the initial position, the primary and secondary levers are completely separated, and the swing arm is entirely within the swing range of the power arm of the force transmission lever, thus having no impact on the movement of the transmission rod.

[0026] As a further improvement, the magnetic switch also includes a stationary iron core fixedly installed in the frame and a moving iron core fixedly connected to the transmission rod. Both the moving iron core and the stationary iron core include a sheet-like soft magnetic substrate and two annular semi-hard magnetic excitation elements fixed to the soft magnetic substrate.

[0027] The beneficial effects are: by designing the moving and stationary iron cores as separate components that are then integrally connected, the structure of the semi-hard magnetic exciter becomes simpler. It can be directly machined from cylindrical blanks, reducing processing difficulty and material removal, thus lowering costs. The soft magnetic substrate primarily serves as the mounting base for the semi-hard magnetic exciter and also forms a magnetic circuit with it. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the magnetically controlled switch in this invention; Figure 2 This is a cross-sectional view of an embodiment of the magnetically controlled switch in this invention, showing the state before manual tripping; Figure 3This is a schematic diagram of the force transmission lever in one embodiment of the magnetically controlled switch of the present invention; Figure 4 This is a state diagram of the manual tripping process in one embodiment of the magnetically controlled switch of the present invention; Figure 5 This is a state diagram of a magnetically controlled switch in one embodiment of the present invention after manual tripping. Figure 6 for Figure 2 A sectional view along the middle edge BB; Figure 7 for Figure 2 A magnified view of a section at point A in the middle; Figure 8 This is a schematic diagram of the top limiting plate in one embodiment of the magnetically controlled switch of the present invention; Figure 9 This is a schematic diagram of the base ring structure in one embodiment of the magnetically controlled switch of the present invention; Figure 10 This is a schematic diagram of the adjusting cone sleeve in one embodiment of the magnetic control switch of the present invention.

[0029] Explanation of reference numerals in the attached figures: 1. Switch bracket; 2. Operating bracket; 21. Bottom limit plate; 22. Top limit plate; 221. Hinge seat; 222. Receiving groove; 223. Boss structure; 224. Threaded hole; 23. Column; 3. Static iron core; 31. Soft magnetic matrix; 32. Semi-hard magnetic exciter; 4. Moving iron core; 41. Soft magnetic matrix; 42. Semi-hard magnetic exciter; 5. Transmission rod; 51. Collar; 6. Connecting nut; 7. Elastic element; 8. Drive shaft; 9. Handle; 10. Rocker arm; 11. Force transmission lever; 111. Moving... 112. Lever arm; 113. Resistance arm; 114. Elongated hole; 115. Connecting groove; 12. Elastic reset element; 13. Elastic component; 131. Mounting base; 132. Elastic body; 133. Rolling ball; 14. Base ring; 141. Mounting hole; 142. Ring groove; 143. Mating cylindrical surface; 15. Adjusting cone sleeve; 151. Inner cone surface; 152. Inner flange; 153. Outer flange; 154. Mating hole; 155. Adjusting section; 156. Limiting section; 16. Pressure spring; 17. Tensioning screw; 18. Coil assembly. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the embodiments.

[0031] Specific embodiments of the magnetically controlled switch provided by this invention: See appendix Figure 1The magnetic control switch includes a frame and a manual tripping mechanism and an operating mechanism mounted on the frame. The frame includes a switch bracket 1 and three operating brackets 2 mounted in the switch bracket 1 and corresponding to the three-phase power supply, respectively. Each operating bracket 2 includes a bottom limit plate 21, a top limit plate 22 and four columns 23 connected between the bottom limit plate 21 and the top limit plate 22. There are three sets of operating mechanisms, which are respectively mounted in the three operating brackets 2.

[0032] See appendix Figure 2 The operating mechanism includes a stationary iron core 3 fixed to the bottom limit plate 21 and a moving iron core 4 located above the stationary iron core 3. The moving iron core 4 can move axially, and its extreme positions are the position where it contacts the stationary iron core 3 and the position where it contacts the top limit plate 22. Both the moving iron core 4 and the stationary iron core 3 have through holes in their centers. The operating mechanism also includes a transmission rod 5 passing through the through holes in the moving iron core 4 and the stationary iron core 3. The transmission rod 5 is fixedly connected to the moving iron core 4 and can move together with it. One end of the transmission rod 5 passes through the stationary iron core 3, the bottom limit plate 21, and the switch bracket 1, and extends out of the switch bracket 1 for connection with a switching component, which is the main component in the switching equipment that performs the breaking function, such as a vacuum interrupter. After the magnetism of the moving iron core 4 and the stationary iron core 3 changes, the moving iron core 4 moves axially, thereby driving the transmission rod 5 to move axially, thus realizing the opening and closing operation.

[0033] The transmission rod 5 and the moving iron core 4 are connected by a connecting nut 6. Specifically, the transmission rod 5 has a stop surface that can achieve axial blocking. The section of the transmission rod 5 facing the stop surface is threaded and fitted with a nut. The stop surface and the nut clamp the moving iron core 4 from both sides of the base plate of the moving iron core 4 to achieve mutual fixation. The aforementioned stop surface can be the interface between the large-diameter section and the small-diameter section of the transmission rod 5, or it can be located on the axial side of the collar 51 on the transmission rod 5.

[0034] The driving force for the moving iron core 4 to move towards the stationary iron core 3 is provided by the magnetic attraction between them, while the driving force for the moving iron core 4 to move away from the stationary iron core 3 is provided by the elastic element 7. Specifically, the elastic element 7 is a helical spring disposed between the stationary iron core 3 and the moving iron core 4. This helical spring is sleeved on the transmission rod 5, with one end abutting against the base plate of the stationary iron core 3 and the other end abutting against the axial side of the collar 51 on the transmission rod 5. Alternatively, it can directly abut against the base plate of the moving iron core 4 without the collar 51. The elastic element 7 is always under pressure, and it is further compressed after the stationary iron core 3 and the moving iron core 4 are attracted together.

[0035] In the traditional design, the moving iron core 4 and the stationary iron core 3 are integral components made of a semi-hard magnetic material. The characteristic of this semi-hard magnetic material is that it can controllably switch between "magnetization" and "demagnetization" states under the influence of an external magnetic field (usually a current pulse). The residual magnetism retained in the later stages of magnetization provides a certain holding force, allowing the moving iron core 4 and the stationary iron core 3 to overcome the elastic force of the elastic element 7 and be attracted together. No electrical energy is consumed during the closing holding process. During opening, only a very small reverse current is needed to demagnetize the moving iron core 4 and the stationary iron core 3. At this time, the elastic potential energy of the elastic element 7 is released, achieving opening.

[0036] Compared to soft magnetic materials, semi-hard magnetic materials are difficult to process into complex shapes, and the material itself is also more expensive. To address this issue, this solution designs both the moving iron core 4 and the stationary iron core 3 as separate components that are then integrally connected. Taking the stationary iron core 3 as an example, it consists of a sheet-like soft magnetic substrate 31 and two annular semi-hard magnetic exciters 32 fixed to the soft magnetic substrate 31. The soft magnetic substrate 31 includes a substrate plate and two protruding rings on the surface of the substrate plate. The positions of the two protruding rings correspond to the positions of the semi-hard magnetic exciters 32, and they have the same radial thickness. The two semi-hard magnetic exciters 32 are axially fixed to the two protruding rings and connected as a single unit, which can be achieved by welding. The moving iron core 4 includes the soft magnetic substrate 41 and the semi-hard magnetic exciters 42, and its structure is the same as that of the stationary iron core 3, so it will not be described in detail here.

[0037] With this configuration, the structure of the semi-hard magnetic exciter becomes simpler, allowing for direct processing using a cylindrical blank. This reduces processing difficulty and material removal, thus lowering costs. The soft magnetic substrate 31 primarily serves as the mounting base for the semi-hard magnetic exciter 32 and also forms a magnetic circuit with it. The operating mechanism also includes a coil assembly 18, which is fixed to the stationary iron core 3 and positioned between the two semi-hard magnetic exciters 32 within the stationary iron core 3.

[0038] One end of the transmission rod 5 is used to connect to the switch component, and the other end is connected to the manual tripping mechanism after passing through the top limit plate 22. The manual tripping mechanism includes a drive shaft 8 rotatably mounted on the switch bracket 1, a handle 9 fixed to one end of the drive shaft 8 for manual operation, three swing rods 10 fixed to the drive shaft 8 and corresponding to the three sets of operating mechanisms, and a force transmission lever 11 hinged to the operating frame. The force transmission lever 11 is specifically mounted on the top limit plate 22 of the operating frame and is hinged through the hinge seat 221 integrally connected to the top limit plate 22.

[0039] The force-transmitting lever 11 and the hinge seat 221 configured therewith are provided with an elongated hole 113 on one of them and a connecting shaft located in the elongated hole 113 and capable of sliding and rotating with the elongated hole 113 on the other. In this embodiment, see the attached drawing. Figure 3The elongated hole 113 is located on the force transmission lever 11, while the connecting shaft is located on the hinge seat 221. In other embodiments, the connecting shaft may be located on the force transmission lever 11, and the elongated hole 113 may be located on the hinge seat 221. Regardless of the form, the purpose is to enable the force transmission lever 11 to move radially along the corresponding control mechanism.

[0040] See appendix Figure 4 and attached Figure 5 The power arm 111 of the force transmission lever 11 can rotate due to the swaying and squeezing of the swing rod 10, which in turn drives the resistance arm 112 of the force transmission lever 11 to rotate. The end of the resistance arm 112 of the force transmission lever 11 is hinged to the corresponding end of the transmission rod 5, which can transmit power to the transmission rod 5, causing the transmission rod 5 to move in the direction of opening the circuit breaker. This is the process of manual opening the circuit breaker. During the movement of the transmission rod 5, the distance between the fulcrum of the force transmission lever 11 and the connection point between the two will change. Therefore, designing the force transmission lever 11 as movable can avoid motion interference. Manual opening can be performed when electrical control is not possible. After the moment of separation, the magnetic attraction force between the moving iron core 4 and the stationary iron core 3 will decrease sharply. At this time, the elastic element 7 can separate the moving iron core 4 and the stationary iron core 3 from each other, completing the subsequent opening operation. Therefore, it is not necessary to maintain the manual operation force continuously after manual opening.

[0041] In this design, the drive shaft 8, handle 9, and rocker arm 10 form a primary lever, and the force transmission lever 11 forms a secondary lever. The main function of the force transmission lever 11 is to change the direction of the force, thereby enabling manual tripping. The drive shaft 8 has an initial position. Figure 2 and Figure 5 All drive shafts 8 are in the initial position, and see Appendix Figure 2 When the drive shaft 8 is in the initial position and the operating mechanism is in the closed position, the side of the rocker arm 10 is parallel to and a distance d from the power arm 111 of the force transmission lever 11. See Appendix Figure 6 The drive shaft 8 is equipped with an elastic reset element 12 for automatic reset after a tripping operation. The elastic reset element 12 is specifically a torsion spring. It is also equipped with a stop and limit element that is configured with the elastic reset element 12 to maintain it at the reset angle. After the drive shaft 8 resets, the rocker arm 10 exits the swing range of the power arm 111 of the force transmission lever 11. This design facilitates manual tripping operations. After performing a manual tripping operation, see the appendix. Figure 5 The operator only needs to release the drive shaft 8 to automatically reset it, without affecting subsequent closing operations. When the drive shaft 8 is in the initial position, the first-stage lever and the second-stage lever are completely separated, and the swing arm 10 is completely within the swing range of the power arm 111 of the force transmission lever 11, so it will not affect the movement of the transmission rod 5.

[0042] In this design, the rocker arm 10 contacts the power arm 111 of the force transmission lever 11 via a cam with an arc surface. This ensures continuous contact between the rocker arm 10 and the power arm 111 during rotation, resulting in smoother contact. Since the force transmission lever 11 is movable and moves towards the transmission rod 5 during manual braking, and the rocker arm 10 contacts the power arm 111 via an arc surface, a combination of rolling and sliding engagement is achieved between the rocker arm 10 and the force transmission lever 11. This results in less friction compared to a purely sliding engagement.

[0043] If the force transmission lever 11 is hinged at a fixed point to the hinge seat 221, and hinged to the transmission rod 5 through the elongated hole 113, although motion interference can be avoided, the fit between the rocker arm 10 and the force transmission lever 11 will become a pure sliding fit, which will increase friction. Friction consumes the energy input for the opening operation, worsens the operating feel, and reduces the service life of the rocker arm 10 and the force transmission lever 11. In addition, in this solution, during the manual opening process, the force transmission lever 11 itself needs to move towards the transmission rod 5, and the force exerted by the rocker arm 10 on the force transmission lever 11 enables it to actively move towards the transmission rod 5, reducing the sense of resistance during operation and improving the operating experience.

[0044] When the circuit is closed, the resistance arm 112 of the force transmission lever 11 is horizontal and perpendicular to the vertical transmission rod 5, while the power arm 111 of the force transmission lever 11 is slightly raised to facilitate the placement of the drive shaft 8 in a suitable position.

[0045] The main part of the power arm 111 of the force transmission lever 11 is a solid structure to provide a larger contact area with the rocker arm 10. A connecting groove 114 is provided from the position where it is hinged to the hinge seat 221 to the position where it is hinged to the transmission rod 5, so that the force transmission lever 11 has a fork-shaped structure as a whole, so that the hinge seat 221 and the transmission rod 5 can extend into the groove and hinge with the force transmission lever 11.

[0046] See appendix Figure 2 and in conjunction with the appendix Figure 7 The frame is equipped with a floating support assembly for providing radial support to the transmission rod 5. See Appendix. Figure 8 The top limiting plate 22 has an upwardly protruding boss structure 223 at the position where the transmission rod 5 passes through. The lower side of the boss has a groove for avoiding the nut on the transmission rod 5. The floating support assembly is specifically set on the boss. The position where the transmission rod 5 cooperates with the floating support assembly is between the position where the transmission rod 5 is connected to the manual tripping mechanism and the position where the transmission rod 5 is fixed to the moving iron core 4.

[0047] The floating support assembly includes an annular mounting bracket and an elastic component 13 arranged on the mounting bracket. A gap is left between the inner side of the mounting bracket and the transmission rod 5. The elastic component 13 includes a rotatably mounted rolling ball 133 and an elastic body 132 for elastically pushing the rolling ball 133 to keep it in close contact with the transmission rod 5. The elastic component 13 also includes a mounting seat 131 with one open end and one closed end. The rolling ball 133 is installed at the open end of the mounting seat 131, and the elastic body 132 is located inside the mounting seat 131 and abuts against the closed end of the rolling ball 133 and the mounting seat 131. The elastic component 13 with the mounting seat 131 can form a structurally independent component, which can be pre-assembled and then assembled. In other embodiments, the elastic component 13 may not include the mounting seat 131. In this case, a blind hole needs to be provided on the inner circumferential surface of the mounting bracket, and then the elastic body 132 and the rolling ball 133 are installed in the blind hole.

[0048] During use, the elastic body 132 is always under compression. Each elastic body 132 is evenly distributed along the circumference, and the direction of the elastic force is pointing towards the center of the transmission rod 5. Therefore, without the action of other forces, the upper end of the transmission rod 5 can be kept in the center position under the action of the floating support assembly.

[0049] The elastic properties of the elastomer 132 ensure that the rolling ball 133 remains in constant contact with the transmission rod 5, preventing any gaps between them. This provides better radial support for the transmission rod 5 without requiring extremely high machining and fitting precision, thus helping to balance production costs. Furthermore, the elastomer 132 has an energy-absorbing function. When the transmission rod 5 experiences lateral vibration, the elastomer 132 absorbs energy to mitigate or even eliminate the vibration. Combined with the rolling ball 133, this reduces wear on the transmission rod 5. Even if the transmission rod 5 wears down over time, the elastomer 132 can extend itself to maintain a tight contact between the rolling ball 133 and the transmission rod 5, achieving lifelong self-adaptation and preventing a vicious cycle. This contributes to a longer service life for the magnetic switch.

[0050] Under the action of external force, the axis of the transmission rod 5 can shift by a certain amount. After the external force is removed, the transmission rod 5 is pushed back into the center by the elastic component 13. The shift of the transmission rod 5 under external force can achieve self-adjustment within a small range, making it less likely for local stress concentration to occur and cause elastic deformation or even plastic deformation. This is beneficial for extending the life of the magnetic switch.

[0051] In the floating support assembly, the initial compression of each elastic component 13 is adjustable. The purpose of adjustment is mainly to obtain a better radial support force. Otherwise, if the radial support force is too small, the transmission rod 5 may not be effectively supported, while if the radial support force is too large, the resistance of the manual tripping operation may be stronger.

[0052] Specifically, the mounting bracket includes a base ring 14 and an adjusting cone sleeve 15, see Appendix Figure 9 The inner diameter of the base ring 14 is larger than the diameter of the transmission rod 5. The base ring 14 is provided with radially penetrating mounting holes 141 for inserting the elastic component 13. There can be two or more mounting holes 141. When there are two mounting holes 141, their axes are collinear and their direction is the same as the extension direction of the force transmission lever 11. When there are more than two mounting holes 141, they are evenly distributed circumferentially. (See appendix) Figure 10 The adjusting cone sleeve 15 is located radially outside the base ring 14 and has an inner cone surface 151 for controlling the elastic force of the elastic component 13 on the transmission rod 5. The closed end of the mounting seat 131 of the elastic component 13 is in close contact with the inner cone surface 151, and the closed end of the mounting seat 131 has a hemispherical structure to reduce the frictional force of sliding relative to the inner cone surface 151. The base ring 14 is fixed relative to the frame, while the axial position of the adjusting cone sleeve 15 relative to the frame is adjustable. When the axial position of the adjusting cone sleeve 15 changes, the contact position between its inner cone surface 151 and each elastic component 13 changes, thereby changing the initial compression of each elastic component 13.

[0053] The top limiting plate 22 is provided with an annular receiving groove 222 for accommodating the mounting bracket. The adjusting cone sleeve 15 and the base ring 14 are both located within the receiving groove 222. The outer circumferential surface of the adjusting cone sleeve 15 and the inner circumferential surface of the receiving groove 222 are connected by a thread to make the position of the adjusting cone sleeve 15 adjustable. An inward flange 152 is provided on the inner side of the opening of the adjusting cone sleeve 15. A pressure spring 16 is provided between one axial end face of the base ring 14 and the frame surface, and the other end face and the inward flange 152, so that the base ring 14 is kept in close contact with the bottom surface of the receiving groove 222. In this way, the base ring 14 can always be in close contact with the bottom surface of the receiving groove 222 during the axial position change of the adjusting cone sleeve 15.

[0054] The base ring 14 is fixed by the pressure spring 16. On the one hand, the structure can be simplified, and there is no need to set up a structure on the frame to fix the base ring 14. On the other hand, the base ring 14 has a certain amount of mobility, which can be adaptively adjusted when the position of the adjusting cone sleeve 15 changes, so as to avoid jamming.

[0055] The axial end face of the base ring 14 is provided with an annular groove 142 for the pressure spring 16 to be engaged, so as to ensure the positional stability of the pressure spring 16 during use. In other embodiments of this solution, the adjusting cone sleeve 15 includes an adjusting section 155 with an inner conical surface 151 and a limiting section 156 with an inner cylindrical surface. The base ring 14 is provided with a mating cylindrical surface 143 for engaging with the inner cylindrical surface of the limiting section 156. In this way, the adjusting cone sleeve 15 has a radial limiting effect on the base ring 14, which can improve the stability of the base ring 14.

[0056] An outwardly turned flange 153 is provided on the outer side of the opening of the adjusting cone sleeve 15, and a mating hole 154 is provided on the outwardly turned flange 153. A locking fastener is provided in the mating hole 154. In this embodiment, the locking fastener is a tensioning screw 17 that passes through the mating hole 154 and is threadedly engaged with a threaded hole 224 at a corresponding position on the top limiting plate 22. In this case, the mating hole 154 is a smooth hole. In other embodiments, the locking fastener can also be a tightening screw that passes through the mating hole 154 and is tightened against the surface of the top limiting plate 22. In this case, the mating hole 154 is a threaded hole and the tightening screw is threadedly engaged with the mating hole 154. The locking fastener can provide an axial force to the adjusting cone sleeve 15, thereby increasing the contact pressure between the threads on the adjusting cone sleeve 15 and the threads on the receiving groove 222, and thus increasing the relative static friction between the two, thereby playing a role in locking and preventing disengagement.

[0057] In other embodiments of this solution, the structure for adjusting the axial position of the cone sleeve 15 can also take other forms. For example, three studs can be provided on the top limiting plate 22, and two adjustable sleeves can be configured on each stud, allowing the studs to pass through the outward flange 153 on the adjusting cone sleeve 15, and the two adjusting sleeves to abut against both sides of the outward flange 153 respectively. The axial position of the adjusting cone sleeve 15 can be changed by turning the adjusting sleeves. In this embodiment, there is no receiving groove 222, so the base ring 14 abuts directly against the surface of the top limiting plate 22 rather than the bottom surface of the receiving groove 222.

[0058] In other embodiments, adjusting the pre-compression of the elastic component 13 (i.e., adjusting the elastic force of the elastic component 13 on the transmission rod 5) can be achieved without relying on the adjusting cone sleeve 15. In this embodiment, the base ring 14 needs to be directly fixed to the top limiting plate 22 by welding or bolting, and the wall thickness of the base ring 14 is increased to make the mounting hole 141 on it longer. Then, a thread is provided at the radially outward end of the mounting hole 141 and an independent adjusting screw is configured to adjust the pre-compression of each elastic component 13 separately.

[0059] If the pre-compression amount of the elastic component 13 can be determined in advance through calculation and experiment, there is no need to set up a structure to adjust the pre-compression amount of the elastic component 13. At this time, only the base ring 14 and the elastic component 13 are needed. The mounting hole 141 on the base ring 14 for mounting the elastic component 13 can be a blind hole with the opening facing inward.

[0060] In this scheme, the manual tripping mechanism and the floating support assembly work together to reduce the lateral force on the transmission rod 5 during manual tripping, thereby making the transmission rod 5 less prone to deformation. At the same time, it also reduces the resistance of the transmission rod 5 during axial movement, preventing the switch from jamming.

[0061] This coordinated relationship is mainly reflected in the manual tripping process. During this process, the distance from the connection point between the force transmission lever 11 and the transmission rod 5 to the fulcrum of the force transmission lever 11 gradually increases. The length of the elongated hole 113 on the force transmission lever 11 matches this change in distance, ensuring that the movement of the force transmission lever 11 itself matches this change in distance. During manual tripping, the friction between the rocker arm 10 and the force transmission lever 11 causes the lever 11 to gradually move towards the transmission rod 5, thus compensating for the increased distance and preventing the force transmission rod from experiencing excessive lateral force. Calculations show that the movement of the contact point between the rocker arm 10 and the force transmission lever 11 is slightly greater than the required movement of the lever 11 itself. Therefore, there is some relative sliding between the rocker arm 10 and the force transmission lever 11, but due to the limitation of the length of the elongated hole 113, the force transmission lever 11 will not move excessively.

[0062] The floating support assembly makes the end of the transmission rod 5 no longer a single arc or straight line determined by ideal geometry, but a natural path balanced by leverage force, elastic support force, and load. This path automatically approaches the path of minimum system stress, so that the transmission rod 5 tilts slightly as a whole during the axial movement of manual opening, and the stress is distributed on the whole section rather than locally. With long-term use, it is not easy to cause serious deformation at the supported position and not easy to get stuck.

[0063] The floating support assembly gives the transmission rod 5 a certain floating capability, while the manual tripping mechanism limits the floating range of the transmission rod 5, allowing the transmission rod 5 to disperse stress through floating without excessive floating.

[0064] Of course, the floating support assembly can also function effectively even without the aforementioned manual tripping mechanism. For example, in the manual tripping mechanism, the force transmission lever 11 is hinged at a fixed point to the hinge seat 221, while it is hinged to the end of the transmission rod 5 through the elongated hole 113. In this case, the floating support assembly can still reliably support the transmission rod 5, prevent vibration, and balance machining and assembly accuracy. However, in this embodiment, since the force transmission lever 11 itself cannot move, it has a pure sliding fit with the swing arm 10 and with the transmission rod 5. The sliding friction cannot be reduced, which leads to a strong tripping resistance and makes it easy to apply a large lateral force to the sensing rod through friction.

[0065] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnetically controlled switch, comprising a frame, a manual tripping mechanism disposed on the frame, and a transmission rod passing through the frame, one end of the transmission rod being connected to a switching component and the other end being connected to the manual tripping mechanism, characterized in that, The frame is provided with a floating support assembly for providing radial support to the transmission rod. The position where the transmission rod is used to cooperate with the floating support assembly is between the position where the transmission rod is used to connect with the manual tripping mechanism and the position where the transmission rod is used to fix the moving iron core. The floating support assembly includes an annular mounting bracket and an elastic component arranged on the mounting bracket. A gap is left between the inner side of the mounting bracket and the transmission rod. The elastic component includes a rotatably mounted rolling ball and an elastic body for elastically pushing the rolling ball to keep the rolling ball in tight contact with the transmission rod.

2. The magnetic switch according to claim 1, characterized in that, The mounting bracket includes a base ring and an adjusting cone sleeve. The base ring has a radially through mounting hole for inserting the elastic component. The adjusting cone sleeve is located radially outside the base ring and has an inner conical surface for controlling the elastic force of the elastic component on the transmission rod. The base ring is fixed relative to the frame, while the axial position of the adjusting cone sleeve relative to the frame is adjustable.

3. The magnetic switch according to claim 2, characterized in that, The frame is provided with a receiving groove for accommodating the mounting bracket. The outer circumferential surface of the adjusting cone sleeve and the inner circumferential surface of the receiving groove are connected by a thread to make the position of the adjusting cone sleeve adjustable.

4. The magnetic switch according to claim 3, characterized in that, The outer edge of the adjusting cone sleeve is provided with an outward flange, and a mating hole is provided on the outward flange. A locking fastener is provided in the mating hole. After the locking fastener passes through the mating hole, it pulls or presses against the frame to lock the adjusting cone sleeve.

5. The magnetic switch according to any one of claims 2-4, characterized in that, An inwardly turned-up edge is provided on the inner side of the adjusting cone sleeve. One axial end face of the base ring is pressed against the surface of the frame, and a pressure spring is provided between the other end face and the inwardly turned-up edge to keep the base ring in close contact with the frame.

6. The magnetic switch according to any one of claims 2-4, characterized in that, The adjusting cone sleeve includes an adjusting section with an inner conical surface and a limiting section with an inner cylindrical surface. The base ring is provided with a mating cylindrical surface for engaging with the inner cylindrical surface of the limiting section.

7. The magnetic switch according to any one of claims 1-4, characterized in that, The manual tripping mechanism includes a drive shaft that rotates with the frame, a handle fixed to the drive shaft and used for manual operation, a rocker arm fixed to the drive shaft, and a force transmission lever hinged to the frame. The power arm of the force transmission lever can rotate due to the swinging and squeezing of the rocker arm. The end of the resistance arm of the force transmission lever is hinged to the end of the transmission rod and used to pull the transmission rod axially during manual tripping. One of the force transmission levers and the hinge seat configured therewith is an elongated hole, and the other is a connecting shaft located in the elongated hole and capable of sliding and rotating with the elongated hole.

8. The magnetic switch according to claim 7, characterized in that, The lever is a cam that contacts the power arm of the force transmission lever through an arc surface.

9. The magnetic switch according to claim 7, characterized in that, The drive shaft is equipped with an elastic reset member for automatic reset after the opening operation, and also with a stop limit member for being configured with the elastic reset member to keep it at the reset angle. After the drive shaft is reset, the swing arm exits the swing range of the power arm of the force transmission lever.

10. The magnetic switch according to any one of claims 1-4, characterized in that, The magnetic switch also includes a stationary iron core fixedly installed in the frame and a moving iron core fixedly connected to the transmission rod. Both the moving iron core and the stationary iron core include a sheet-like soft magnetic substrate and two annular semi-hard magnetic excitation components fixed to the soft magnetic substrate.

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