Permanent magnet mechanism and mounting structure thereof

Abstract

The application discloses a permanent magnet mechanism and a mounting structure thereof, which comprises a shell, a moving iron core, a moving core rod and an insulating pull rod. The moving iron core is slidably arranged in the shell, the moving core rod is mounted on the moving iron core, and the insulating pull rod is movably connected with the moving core rod through a first end. During the process of opening and closing, the axis of the insulating pull rod and the axis of the moving core rod at least instantaneously coincide once. The application has the beneficial effect that during the process of closing or opening operation of the permanent magnet mechanism, the axis of the insulating pull rod and the axis of the driving end of the permanent magnet mechanism at least instantaneously coincide once, which aims to make the axis of the moving core rod and the axis of the insulating pull rod approach to the state of coincidence, so that the relative inclination angle of the two is reduced. In this way, during the whole process of opening and closing, the radial component force of the insulating pull rod acting on the moving core rod is greatly reduced, so that the influence of the opening and closing force on the permanent magnet mechanism is reduced, and the service life of the permanent magnet mechanism is prolonged.

Description

Technical Field

[0001] This application relates to the field of switchgear technology, and in particular to a permanent magnet mechanism and its mounting structure. Background Technology

[0002] The permanent magnet mechanism adopts a brand-new intelligent phase-selective vacuum switch structure. This structure has only one main moving part during operation, eliminating the need for mechanical release and locking devices, reducing the sources of failure, increasing reliability, and extending service life to over 100,000 cycles. It also controls the opening and closing phases to achieve synchronous control, thereby reducing the impact of overvoltage and inrush current on the system, reducing the investment in system protection, and improving the overall lifespan of the system.

[0003] Permanent magnet mechanisms typically work in conjunction with insulating pull rods to control the opening and closing of corresponding switches. However, during the opening and closing process, the insulating pull rod exerts a reaction force on the moving core rod of the permanent magnet mechanism. Over time, this can affect the service life of the permanent magnet mechanism and the stability of its closing operation. Therefore, how to improve existing permanent magnet mechanisms to reduce the impact of the forces exerted during opening and closing is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] One of the objectives of this application is to provide a permanent magnet mechanism with good stability.

[0005] Another object of this application is to provide a mounting structure for a permanent magnet mechanism.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: a permanent magnet mechanism, comprising a housing, a moving iron core, a moving core rod, and an insulating pull rod, wherein the moving iron core is slidably disposed within the housing, the moving core rod is installed on the moving iron core, and the insulating pull rod is movably connected to the moving core rod through a first end; during the opening / closing process, the axis of the insulating pull rod coincides with the axis of the moving core rod at least once momentarily.

[0007] Preferably, when the circuit is closed, the axis of the insulating pull rod coincides with the axis of the moving core rod.

[0008] Preferably, the permanent magnet mechanism is adapted to cooperate with the vacuum interrupter and the transmission crank arm; the transmission crank arm is rotatably mounted on a bracket at the end of the vacuum interrupter via a central section, the top end of the transmission crank arm is connected to the second end of the insulating pull rod, and the bottom end of the transmission crank arm is connected to the moving contact of the vacuum interrupter; the vacuum interrupter is horizontally arranged, and both the permanent magnet mechanism and the insulating pull rod are inclined, so that the connection point between the insulating pull rod and the transmission crank arm is close to the rotation center of the transmission crank arm.

[0009] Preferably, it further includes a limiting member, wherein the moving core rod passes through the moving iron core and its end is locked to the moving iron core through a connector, the limiting member is installed on the moving iron core and is adapted to limit and lock the connector, so that the moving iron core and the moving core rod remain locked together.

[0010] Preferably, the connector includes a nut, and the moving core rod includes an installation section and a connecting section, the diameter of the installation section being smaller than the diameter of the connecting section; when installing the moving core rod, the installation section passes through the moving iron core and its end is tightened with the nut, and the nut and the connecting section respectively abut against both sides of the moving iron core.

[0011] Preferably, a mounting groove is provided on one side of the moving iron core, so that the nut after being tightened is located in the mounting groove.

[0012] Preferably, the outer side of the limiting member is provided with a slot, which cooperates with the nut to lock the nut in the circumferential direction.

[0013] Preferably, it includes a frame and a pair of guide plates. The housing is fixedly installed on the frame, and the guide plates are installed on the frame or the housing and located on both sides of the housing. The limiting member slides with the guide plate to guide and limit the moving iron core.

[0014] Preferably, both ends of the limiting member are bent to form a sliding part integrally formed therewith, and a guide groove is provided on the outer side of the guide plate. The sliding part cooperates with the guide groove to realize the sliding cooperation between the limiting member and the guide plate.

[0015] Preferably, a connecting piece extends integrally from the sidewall of one of the guide grooves, the connecting piece is bent outward to form a mounting portion, and the mounting portion has a mounting hole for mounting a sensor; the sensor is adapted to detect the distance to the sliding portion and thus monitor the opening and closing status of the permanent magnet mechanism in real time.

[0016] Compared with the prior art, the beneficial effects of this application are as follows:

[0017] In the process of the permanent magnet mechanism performing closing or opening operations, the axis of the insulating pull rod and the axis of the drive end of the permanent magnet mechanism will at least moment coincide once. The purpose is to make the axis of the moving core rod and the axis of the insulating pull rod close to coincide, so as to reduce the relative tilt angle between them. In this way, the radial component of the force exerted by the insulating pull rod on the moving core rod will be greatly reduced during the entire opening and closing process, thereby reducing the impact of the opening and closing force on the permanent magnet mechanism and extending the service life of the permanent magnet mechanism. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is an enlarged structural diagram of point A of this utility model.

[0020] Figure 3 This is a three-dimensional structural diagram of the guide plate and limiting plate of this utility model.

[0021] Figure 4 This is a schematic diagram of the permanent magnet mechanism of this utility model when it is open.

[0022] Figure 5 for Figure 4 A schematic diagram of a local structure.

[0023] Figure 6 This is a schematic diagram of the permanent magnet mechanism of this utility model when it is closed.

[0024] Figure 7 A schematic diagram showing the horizontal installation of the permanent magnet mechanism and the inclined setting of the insulating tie rod.

[0025] Figure 8 An installation diagram showing the horizontal installation of both the permanent magnet mechanism and the insulating tie rod.

[0026] Figure 9 A schematic diagram showing the installation of the permanent magnet mechanism at an angle and the insulated tie rod set horizontally.

[0027] In the diagram: 1. Frame; 2. Shell; 3. Moving iron core; 4. Guide plate; 401. Mounting part; 402. Guide groove; 5. Sensor; 6. Limiting plate; 601. Sliding part; 7. Slot; 8. Nut; 9. Insulating tie rod; 10. Transmission crank arm; 11. Vacuum interrupter; 12. Coil; 13. Stationary iron core; 14. Mounting groove; 15. Moving core rod; 1501. Mounting section; 1502. Connecting section. Detailed Implementation

[0028] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship 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, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0030] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0031] Further analysis is needed regarding the reasons why the service life of permanent magnet mechanisms (or magnetic control mechanisms) in existing technologies is affected by large forces: such as Figure 5 As shown, the permanent magnet mechanism mainly consists of a housing 2, a moving iron core 3, a moving core rod 15, a stationary iron core 13, and a coil 12. The installation structure and operating principle of these components are also existing technologies. The moving core rod 15 is connected to an insulating pull rod 9, which drives the corresponding contacts to move. Figure 7 As shown, the axis of the insulating pull rod 9 and the axis of the drive end (i.e., the moving core rod 15) of the permanent magnet mechanism are inclined. Figure 7 (As shown by the dashed line), therefore, the reaction force F of the insulating tie rod 9 on the moving core rod 15 can be decomposed into a component force F along its axial direction. 轴 and its radial component F 径 It is clear that the force F acting on the moving core rod 15 is... 径 The larger the value, the more prone it is to deformation and breakage; therefore, F 径 It is a key factor affecting its service life.

[0032] Therefore, the inventors of this application have developed a permanent magnet mechanism, one embodiment of which is, for example... Figures 1 to 9 As shown, it includes a housing 2, a moving iron core 3, a moving core rod 15, and an insulating tie rod 9. The moving iron core 3 is slidably disposed inside the housing 2, the moving core rod 15 is installed on the moving iron core 3, and the insulating tie rod 9 is movably connected to the moving core rod 15 through a first end (generally by hinge).

[0033] It should be known that F 径 The size depends on the relative tilt angle between the moving core rod 15 and the insulating tie rod 9 (i.e., the tilt angle and F). 径 (Positively correlated), so it is only necessary to ensure that the axes of the moving core rod 15 and the insulating pull rod 9 are nearly coincident during the closing and opening of the vacuum interrupter 11, such as Figure 4 As shown, for example, the relative tilt angle between the moving core rod 15 and the insulating tie rod 9 is between 1° and 3°, and their axes coincide at least once during opening and closing. This significantly reduces the radial component force F_diameter of the insulating tie rod 9 on the moving core rod 15. Moreover, the smaller the F_diameter, the smaller the sliding friction between the moving core rod 15 and the moving iron core 3, resulting in smoother movement, reduced wear, and an extended service life of the permanent magnet mechanism.

[0034] In addition, when the moving core rod 15 is in the closed state, or at the moment of closing, the reaction force it receives is the greatest. At this time, the axes of the two coincide, which will minimize the radial component force on the moving core rod 15, thereby minimizing the impact on the moving core rod 15 and thus ensuring the closing force to a great extent.

[0035] In this embodiment, a specific application scenario of the permanent magnet mechanism is illustrated: the permanent magnet mechanism can cooperate with the vacuum interrupter 11 and the transmission crank arm 10. The transmission crank arm 10 is rotatably mounted on the bracket at the end of the vacuum interrupter 11 through the middle. The top end of the transmission crank arm 10 is connected to the second end of the insulating pull rod 9 (generally hinged), and the bottom end of the transmission crank arm 10 is movably connected to the moving contact of the vacuum interrupter 11.

[0036] There are also various ways to install the permanent magnet mechanism and the insulating tie rod 9 together, for example: Figure 8 As shown, both are installed horizontally. Let the rotation point of the transmission crank arm 10 be O. Using point O as the boundary, the transmission crank arm 10 is divided into an upper first segment and a lower second segment. The first segment, connected to the insulating pull rod 9, is the power arm, and the second segment, connected to the moving contact, is the resistance arm. It is worth noting that, as... Figure 1 As shown, a current transformer is installed outside the solid-sealed pole of the vacuum interrupter 11. Therefore, a certain distance must be maintained between the permanent magnet mechanism and the vacuum interrupter 11. At this point, the ratio of the power arm to the resistance arm is relatively large, thus requiring the permanent magnet mechanism to have a larger stroke to meet the opening and closing requirements. Furthermore, if point O is set too high, the support bracket on the right end of the solid-sealed pole will experience a larger bending moment during closing, affecting the force distribution. And if... Figure 7 As shown, the permanent magnet mechanism is installed horizontally, and the insulating tie rod 9 is set at an angle; as Figure 9 As shown, the permanent magnet mechanism is installed at an angle, while the insulating tie rod 9 is installed horizontally. Although both solve the stroke problem of the permanent magnet mechanism, they will bring about the problem of radial force.

[0037] Further optimization, such as Figure 6As shown, both the permanent magnet mechanism and the insulating pull rod 9 are inclined, so that the connection point between the insulating pull rod 9 and the transmission crank arm 10 is close to point O (i.e., the power arm is shortened). The purpose is to reduce the ratio of the power arm to the resistance arm, so that the moving core rod 15 has a suitable stroke to meet the opening and closing requirements of the moving contact. Furthermore, the axes of the moving core rod 15 and the insulating pull rod 9 tend to coincide, which also solves the problem caused by the radial component force.

[0038] It should be noted that in actual design, the ratio of the power arm to the resistance arm should not be too small, otherwise a greater magnetic force will be required to drive the closing. Therefore, the length of the transmission crank arm 10 should be selected according to the ratio of the power arm to the resistance arm to make the space compact and the force reasonable.

[0039] In one embodiment of this application, the permanent magnet mechanism further includes a limiting member. The moving core rod 15 passes through the moving iron core 3 and its end is locked to the moving iron core 3 through a connector. The limiting member is installed on the moving iron core 3 and can limit and lock the connector so that the moving iron core 3 and the moving core rod 15 remain locked together.

[0040] Understandably, by setting the limit component, the connecting parts of the moving iron core 3 and the moving core rod 15 can be locked and limited. In this way, even when the moving iron core 3 is subjected to a large impact force when it is closed, the connecting parts will not loosen, thereby greatly improving the overall stability and service life of the permanent magnet mechanism.

[0041] As a further description of the above embodiments, the connector generally uses nut 8, and the specific installation method of the moving core rod 15 is as follows: Figure 5 As shown, the moving core rod 15 includes an installation section 1501 and a connecting section 1502. The diameter of the installation section 1501 is smaller than the diameter of the connecting section 1502, i.e., the installation section 1501 is thinner and the connecting section 1502 is thicker. When installing the moving core rod 15, the moving core rod 15 is inserted from the right end of the housing 2 and passes through the stationary iron core 13. Then, the installation section 1501 passes through the moving iron core 3. The left end of the installation section 1501 has threads. Finally, the nut 8 is tightened on the left end of the installation section 1501. At this time, the nut 8 and the connecting section 1502 abut against the two sides of the moving iron core 3, thereby realizing the locking connection between the moving iron core 3 and the moving core rod 15. The installation method is simple and improves the efficiency of disassembly and assembly.

[0042] Furthermore, in order to better conceal the installed nut 8 so that it does not protrude from the left side of the moving iron core 3, a mounting groove 14 can be provided on the left side of the moving iron core 3. This allows the tightened nut 8 to be located within the mounting groove 14, making the overall structure of the permanent magnet mechanism more compact and eliminating any protrusions. It also improves the aesthetics of the permanent magnet mechanism.

[0043] like Figure 2 As shown, the limiting component is a limiting plate 6, with a slot 7 on its side. Specifically, the limiting plate 6 can be installed on the left side of the moving iron core 3 using screws / bolts. At this point, the slot 7 engages perfectly with the nut 8, preventing the nut 8 from rotating under the limiting effect of the slot 7, thus locking the nut 8 in the circumferential direction. Therefore, with this design, no matter how much impact force the permanent magnet mechanism experiences during closing, the nut 8 will not loosen, ensuring installation stability and improving service life.

[0044] Another aspect of this application provides an installation structure for the aforementioned permanent magnet mechanism, including a frame 1 and a pair of guide plates 4. The housing 2 is installed on the frame 1. The vacuum interrupter 11 can be horizontally embedded in the frame 1 via a through-wall fixed pole. The guide plates 4 can be installed on the frame 1 by bolts, or they can be installed outside the housing 2. The two guide plates 4 are located on both sides of the housing 2 after installation. The limiting member (i.e., the limiting plate 6) slides with the guide plates 4, which can guide and limit the moving iron core 3, so that the moving iron core 3 can only move along the axial direction of the permanent magnet mechanism.

[0045] Understandably, if the housing 2 has a guide rail mechanism for sliding the moving iron core 3, then the guide plate 4 can further limit the movement of the moving iron core 3, thereby greatly improving the stability of the moving iron core 3 during movement. If the housing 2 does not have a guide rail mechanism for sliding the moving iron core 3, or if it is difficult to set up such a mechanism, for example, if the housing 2 and the moving iron core 3 are cylindrical in shape, then the guide plate 4 can guide and limit the movement of the moving iron core 3, making it more stable during movement. This also prevents the nut 8 from loosening due to the circumferential rotation of the moving iron core 3.

[0046] like Figure 2 and Figure 3 As shown, the specific sliding engagement between the guide plate 4 and the limiting plate 6 is as follows: both ends of the limiting plate 6 are bent to form an integrally formed sliding part 601. A guide groove 402 is provided on the outer side of the guide plate 4. The sliding part 601 and the guide groove 402 cooperate to achieve the sliding engagement between the limiting part and the guide plate 4. This also further prevents the limiting plate 6 from rotating, so that the transmission chain such as the moving iron core 3 and the moving core rod 15 will not rotate, that is, they can only move along the axial direction of the permanent magnet mechanism. In this way, the threaded mounting structure on the transmission chain can always remain in a tight state and will not loosen due to rotation, which greatly improves the overall stability and reliability.

[0047] Of course, the permanent magnet mechanism also includes sensor 5, namely the opening and closing signal sensor or proximity switch; in the existing technology, sensor 5 is generally installed on the rear side of the permanent magnet mechanism, that is, directly detecting the position of the moving iron core 3. This installation method makes the overall structure more complicated and occupies installation space.

[0048] Therefore, as Figure 2 As shown, a sensor 5 is installed on the side of one of the guide plates 4 (or both guide plates 4), and the sensor 5 cooperates with the corresponding sliding part 601. It can be understood that the sensor 5 can monitor the opening and closing status of the permanent magnet mechanism in real time by detecting the distance between itself and the sliding part 601.

[0049] Furthermore, to facilitate the installation of sensor 5, a single-sided connecting piece is bent outward within the guide groove 402 to form a mounting portion 401. This mounting portion 401 has mounting holes for installing sensor 5. It should be noted that the single-sided connecting piece refers to a connecting piece that is connected to the guide groove 402 on only one side.

[0050] Furthermore, such as Figure 2 As shown, the front end of the housing 2 is securely mounted on the frame 1, and the rear end of the housing 2 can be an open structure. When the circuit is closed, the moving iron core 3 is inside the housing 2; when the circuit is open, part of its structure can extend beyond the housing 2. This facilitates the rapid installation of the limit plate 6 onto the moving iron core 3, and because the limit plate 6 is located outside the housing 2, there is no interference between it and the housing 2.

[0051] Furthermore, the cooperation between the limiting plate 6 and the guide plate 4 not only guides and limits the moving iron core 3, but also facilitates the installation of the sensor 5 and allows for indirect detection of the opening and closing status of the permanent magnet mechanism. Moreover, the installation of the entire permanent magnet mechanism is simple and convenient, such as... Figure 5 As shown, ① First, the permanent magnet mechanism is fixedly installed on the frame 1 using the housing 2 and bolts. ② The moving core rod 15 is inserted from the right end of the housing 2 and passes through the stationary iron core 13. Then, the mounting section 1501 passes through the moving iron core 3 and extends into the mounting groove 14. The nut 8 is then tightened at the left end of the mounting section 1501. Figure 2 As shown, ③ the limiting plate 6 is installed on the outside of the moving iron core 3 with screws / bolts, and the slot 7 on the limiting plate 6 engages with the nut 8 to prevent the nut 8 from rotating when impacted. ④ Guide plates 4 are installed on both sides of the housing 2 with screws / bolts. After installation, the sliding part 601 engages with the guide groove 402, and the sensor 5 corresponds to the corresponding sliding part 601.

[0052] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet mechanism, characterized in that, include: case; A moving iron core, which is slidably disposed within the housing; A moving core rod, which is mounted on the moving iron core; as well as An insulating pull rod is provided, which is movably connected to the moving core rod via a first end; during the opening / closing process, the axis of the insulating pull rod coincides with the axis of the moving core rod at least once momentarily.

2. The permanent magnet mechanism as described in claim 1, characterized in that: When the circuit is closed, the axis of the insulating pull rod coincides with the axis of the moving core rod.

3. The permanent magnet mechanism as described in claim 2, characterized in that: The permanent magnet mechanism is adapted to cooperate with the vacuum interrupter and the transmission crank arm; the transmission crank arm is rotatably mounted on a bracket at the end of the vacuum interrupter via a central part, the top end of the transmission crank arm is connected to the second end of the insulating pull rod, and the bottom end of the transmission crank arm is connected to the moving contact of the vacuum interrupter; the vacuum interrupter is horizontally arranged, and both the permanent magnet mechanism and the insulating pull rod are inclined, so that the connection point between the insulating pull rod and the transmission crank arm is close to the rotation center of the transmission crank arm.

4. The permanent magnet mechanism as described in any one of claims 1-3, characterized in that: It also includes a limiting member, wherein the moving core rod passes through the moving iron core and its end is locked to the moving iron core through a connector, the limiting member is installed on the moving iron core and is adapted to limit and lock the connector so that the moving iron core and the moving core rod remain locked together.

5. The permanent magnet mechanism as described in claim 4, characterized in that: The connector includes a nut, and the moving core rod includes an installation section and a connecting section. The diameter of the installation section is smaller than the diameter of the connecting section. When installing the moving core rod, the installation section passes through the moving iron core and its end is tightened with the nut. The nut and the connecting section abut against both sides of the moving iron core.

6. The permanent magnet mechanism as described in claim 5, characterized in that: A mounting groove is provided on one side of the moving iron core, so that the nut after being tightened is located in the mounting groove.

7. The permanent magnet mechanism as described in claim 6, characterized in that: The limiting member has a slot on its outer side, which engages with the nut to lock the nut in the circumferential direction.

8. An installation structure applied to a permanent magnet mechanism as described in any one of claims 4-7, characterized in that: It includes a frame and a pair of guide plates. The housing is fixedly installed on the frame. The guide plates are installed on the frame or the housing and located on both sides of the housing. The limiting member slides with the guide plate to guide and limit the moving iron core.

9. The mounting structure as described in claim 8, characterized in that: Both ends of the limiting member are bent to form a sliding part integrally formed therewith. A guide groove is provided on the outer side of the guide plate. The sliding part cooperates with the guide groove to realize the sliding cooperation between the limiting member and the guide plate.

10. The mounting structure as described in claim 9, characterized in that: One of the guide groove sidewalls integrally extends a connecting piece, the connecting piece is bent outward to form a mounting part, the mounting part has a mounting hole for mounting a sensor; the sensor is adapted to detect the distance to the sliding part and thus monitor the opening and closing status of the permanent magnet mechanism in real time.

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