A magnetic control mechanism and phase selection switch

Abstract

The application discloses a magnetic control mechanism, which comprises a shell, a static iron core, a dynamic iron core and a coil. The static iron core is arranged on the inner side of one end of the shell. The dynamic iron core is arranged in the shell and is matched with the static iron core. The coil is connected with the inner side of one end of the shell and is matched with the static iron core, so that the static iron core is locked in the shell. The coil is matched with the static iron core and the dynamic iron core. The application also discloses a phase selection switch. The application has the advantages that the static iron core and the dynamic iron core can be kept in the state of being attracted to each other by residual magnetism after the excitation current of the coil disappears, so that the closing state can be maintained without continuously inputting current into the coil by an external power supply, thereby saving energy. Meanwhile, the magnetic control mechanism is stable and has relatively low cost.

Description

Technical Field

[0001] This application relates to the field of switchgear technology, and in particular to a magnetic control mechanism and a phase selection switch. Background Technology

[0002] In phase selection switches, such as phase selection contactors, they are mainly composed of a vacuum interrupter and a permanent magnet mechanism. The permanent magnet mechanism drives the moving contact in the vacuum interrupter to move, thereby realizing the opening and closing of the contactor. The permanent magnet mechanism generally includes a housing and components such as moving and fixed iron cores, permanent magnets, and coils installed in the housing. That is, when the permanent magnet mechanism is closed, the moving iron core is attracted by the permanent magnet. However, permanent magnet materials are expensive and may experience irreversible demagnetization under high temperature, vibration, and overload current conditions. Therefore, a magnetic control mechanism and phase selection switch are proposed to solve the above technical problems. Utility Model Content

[0003] One of the objectives of this application is to provide a magnetic control mechanism.

[0004] Another objective of this application is to provide a phase selection switch.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a magnetic control mechanism, comprising a housing, a stationary iron core, a moving iron core, and a coil. The stationary iron core is disposed on the inner side of one end of the housing, and the moving iron core is slidably disposed within the housing and correspondingly cooperates with the stationary iron core. The coil is connected to the inner side of one end of the housing and abuts against the stationary iron core, thereby locking the stationary iron core within the housing. The coil is adapted to cooperate with the stationary iron core and the moving iron core. When the coil is energized, the moving iron core and the stationary iron core are adapted to be energized under the action of the coil, and the moving iron core is adapted to move under the action of magnetic force until it abuts against the stationary iron core. When the coil is de-energized, the moving iron core and the stationary iron core are adapted to maintain an attractive state with the stationary iron core under the action of residual magnetism.

[0006] Preferably, a pressure plate is installed on the side of the moving iron core away from the stationary iron core, and the middle side of the end of the pressure plate extends outward to form a sliding plate. A sliding groove is provided on the outer side of the housing, and the sliding plate slides in cooperation with the sliding groove.

[0007] Preferably, an end cap is detachably installed at the other end of the housing, and a buffer assembly is installed on the side of the end cap near the housing; when the moving iron core separates from the stationary iron core under the action of external force, the buffer assembly is adapted to absorb the separation impact force of the moving iron core.

[0008] Preferably, the buffer assembly includes a buffer pad and a buffer plate, with the buffer pad disposed between the buffer plate and the end cap; the buffer pad is adapted to absorb impact energy through elastic deformation.

[0009] Preferably, the other end of the housing is provided with a mounting groove communicating with the slide groove, the diameter of the mounting groove is larger than the diameter of the slide groove, the middle side of the end of the buffer plate extends outward to form a mounting part, the mounting part cooperates with the mounting groove; the end cover after installation is adapted to lock the buffer plate by the buffer pad.

[0010] Preferably, the coil is sleeved outside the core posts of both the stationary iron core and the moving iron core, and the depth of the inner cavity of the moving iron core is greater than the length of the coil extending out of the stationary iron core.

[0011] A phase-selective switch has multiple phases, each phase including the aforementioned magnetic control mechanism, a vacuum interrupter, and a transmission mechanism. The vacuum interrupter includes a moving contact and a stationary contact. The transmission mechanism includes a linkage assembly, a tripping spring, and an overtravel spring. The first end of the linkage assembly is rigidly connected to the moving contact, and the second end of the linkage assembly is movably connected to the moving iron core, passing through both the stationary and moving iron cores. The tripping spring and the overtravel spring are both located in the middle section of the linkage assembly. When the switch is closed, the magnetic control mechanism is energized, causing the moving iron core to move closer to the stationary iron core. The moving iron core then drives the moving contact to move closer to the stationary contact via the linkage assembly, at which point the tripping spring and the overtravel spring are compressed. After the switch is closed, the linkage assembly and the moving iron core slide relative to each other under the action of the overtravel spring, forming a visible overtravel distance between the second end of the linkage assembly and the moving iron core.

[0012] Preferably, the phase selection switch further includes a sealing plate, the vacuum interrupter is disposed on one side of the sealing plate, the magnetic control mechanism is disposed on the other side of the sealing plate, and the transmission mechanism passes through the sealing plate and drives the vacuum interrupter and the magnetic control mechanism; the magnetic control mechanism further includes a guide tube, and the transmission mechanism further includes a guide pad and a spring pad. The guide tube, the guide pad, and the spring pad are all sleeved on the outside of the linkage assembly. The overtravel spring is located between the guide pad and the spring pad. The spring pad abuts against the middle section of the linkage assembly. The guide tube passes through the stationary iron core and its first end abuts against the guide pad. The second end of the guide tube abuts against the moving iron core. The two ends of the opening spring respectively cooperate with the guide pad and the sealing plate. The overtravel spring is located inside the opening spring. When closing, the moving iron core is adapted to push the guide pad through the guide tube, and the guide pad is adapted to drive the linkage assembly to move through the overtravel spring and the spring pad to realize the closure of the moving contact and the stationary contact.

[0013] Preferably, a solid-sealing pole is installed on one side of the sealing plate, and the vacuum interrupter is located inside the solid-sealing pole; the connecting rod assembly includes a guide rod, an insulating pull rod, and a moving rod, the insulating pull rod is located inside the solid-sealing pole and its first end is connected to the moving contact, the moving rod passes through the sealing plate and its first end is connected to the second end of the insulating pull rod, the second end of the moving rod is connected to the first end of the guide rod by a thread, and the second end of the guide rod forms the aforementioned overtravel distance with the moving iron core.

[0014] Preferably, the diameter of the guide rod is smaller than the diameter of the moving rod, the guide tube, the guide pad, and the spring pad are all sleeved on the outside of the guide rod, and the connection between the guide rod and the moving rod forms the middle section of the connecting rod assembly.

[0015] Compared with the prior art, the beneficial effects of this application are as follows:

[0016] (1) By setting a fixed moving iron core with a new material, after the excitation current of the coil disappears, the two iron cores can maintain the state of being attracted by the residual magnetism. In this way, it is not necessary to continuously supply current to the coil through an external power source to maintain the closed state, thereby saving energy; that is, the principle of magnetic control mechanism is adopted to improve the reliability of the mechanism and reduce the cost.

[0017] (2) When applied to gas-insulated switchgear, the product volume is greatly reduced compared to air-insulated switchgear.

[0018] (3) In this phase selection switch, by setting the connecting rod assembly through the magnetic control mechanism, the overtravel of the overtravel spring can be observed and measured from the front of the magnetic control mechanism, which facilitates timely detection of the wear of the vacuum interrupter contacts inside the phase selection switch in the later stage. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is an enlarged structural diagram of point A of this utility model.

[0021] Figure 3 This is a schematic diagram of the separation of the moving and stationary iron cores according to this utility model.

[0022] Figure 4 This is a schematic diagram of the attraction between the moving and stationary iron cores of this utility model.

[0023] Figure 5 This is a schematic diagram of the phase selection switch structure of this utility model.

[0024] Figure 6 This is a schematic diagram of the state of the phase selection switch of this utility model when it is open.

[0025] Figure 7 This is a schematic diagram of the phase selection switch of this utility model when it is closed.

[0026] In the diagram: 1. Housing; 2. End cap; 3. Guide tube; 4. Slide groove; 5. Mounting groove; 6. Moving iron core; 7. Pressure plate; 701. Slide plate; 8. Buffer plate; 801. Mounting part; 9. Buffer pad; 10. Coil; 11. Stationary iron core; 12. Sealing plate; 13. Solid-sealed pole; 14. Connecting rod assembly; 1401. Insulating tie rod; 1402. Moving rod; 1403. Guide rod; 15. Vacuum interrupter; 1501. Stationary contact; 1502. Moving contact; 16. Opening spring; 17. Overtravel spring; 18. Spring washer; 19. Guide pad. Detailed Implementation

[0027] 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.

[0028] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, and should not be construed as limiting the specific protection scope of this application.

[0029] 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.

[0030] One preferred embodiment of this application, such as Figures 1 to 7 As shown, a magnetic control mechanism includes a housing 1, a stationary iron core 11, a moving iron core 6, and a coil 10, as follows: Figure 4As shown, the stationary iron core 11 is located inside one end (left end) of the housing 1, while the moving iron core 6 is slidably disposed inside the housing 1 and corresponds to and cooperates with the stationary iron core 11. The coil 10 is connected to the inside of the left end of the housing 1, and the coil 10 and the stationary iron core 11 are in abutting state. For example, a through mounting hole is provided on the stationary iron core 11, and the coil 10 is located on the right side of the stationary iron core 11. Then, a bolt is inserted into the mounting hole at the left end of the housing 1 to fix the coil 10. At this time, the stationary iron core 11 will be locked inside the housing 1 by the tightening of the coil 10, thus completing the installation. That is to say, the installation of the two components, the stationary iron core 11 and the coil 10, can be achieved by a single bolt. After installation, the coil 10, the stationary iron core 11, and the moving iron core 6 all cooperate with each other.

[0031] Specifically, such as Figure 3 As shown, this is the separated state of the magnetic control mechanism. At this time, the moving iron core 6 is located inside the housing 1 on the right side, with the two iron cores far apart. During closing, a positive closing pulse current can be supplied to the excitation coil 10, thereby energizing the moving iron core 6 and the stationary iron core 11 to generate magnetic force. Therefore, under the action of magnetic force, the moving iron core 6 will move to the left until it attracts the stationary iron core 11, completing the closing process. Figure 4 As shown. When the excitation current disappears, the two iron cores can remain attracted to each other by relying on residual magnetism. This eliminates the need to continuously supply current to the coil 10 from an external power source to maintain the closed state, thus saving energy. Furthermore, when it is necessary to open the circuit, a reverse opening pulse current can be supplied to the coil 10, causing the magnetic force between the moving iron core 6 and the stationary iron core 11 to be canceled. Under the action of external force, the moving iron core 6 can return to the open position, completing the opening action.

[0032] It should be noted that the moving iron core 6 and the stationary iron core 11 can be made of materials with suitable semi-hard magnetism, that is, to ensure that after the excitation current disappears, the moving iron core 6 and the stationary iron core 11 can stably maintain the attraction state by relying on the residual magnetism. Of course, this is also common knowledge known to those skilled in the art.

[0033] As a further description of the above embodiments, the sliding installation method of the moving iron core 6 is as follows: Figure 3 and Figure 4 As shown, a pressure plate 7 is installed on the side of the moving iron core 6 away from the stationary iron core 11 (i.e., the right side), as... Figure 2 As shown, the end of the pressure plate 7 extends outward to form a sliding plate 701, that is, the sliding plate 701 and the pressure plate 7 are integrated. A groove 4 can be opened through the outer side of the housing 1. The sliding plate 701 and the groove 4 slide together, thereby realizing the sliding installation of the moving iron core 6. At the same time, it prevents the moving iron core 6 from rotating, and makes it difficult for the fasteners fixed on the moving iron core 6 to loosen during use.

[0034] Furthermore, the slide plate 701 and the slide groove 4 are preferably provided in pairs, that is, the slide groove 4 is provided on opposite sides of the housing 1, and the slide plate 701 is provided at both ends of the pressure plate 7. The symmetrical design ensures the stability of the moving iron core 6 when it slides in the housing 1.

[0035] In one embodiment of this application, such as Figure 6 As shown, we know that the aforementioned magnetic control mechanism is generally used in phase-selective contactors. Therefore, during tripping, the moving iron core 6 will be instantly and rapidly separated under external force. The other end of the housing 1 is detachably fitted with an end cover 2 (e.g., bolted connection). A buffer assembly is installed on the side (left side) of the end cover 2 near the housing 1. It can be understood that when the moving iron core 6 separates from the stationary iron core 11 under external force, the buffer assembly can absorb the separation impact force of the moving iron core 6.

[0036] Specifically, such as Figure 4 As shown, the buffer assembly includes a buffer pad 9 and a buffer plate 8, with the buffer pad 9 positioned between the buffer plate 8 and the end cap 2. It should be understood that when the moving iron core 6 separates rapidly, it impacts the buffer plate 8. The buffer pad 9 absorbs the impact energy through elastic deformation under this impact force, thereby reducing damage to other components of the magnetic control mechanism. The buffer pad 9 is typically made of a material with good elasticity, such as rubber or polyurethane, to ensure its effective absorption of impact energy.

[0037] Furthermore, to improve the efficiency of assembling and disassembling the buffer assembly, it can be installed in the following manner: Figure 2 As shown, a mounting groove 5 communicating with the aforementioned slide groove 4 is provided at the other end (right end) of the housing 1. The diameter of the mounting groove 5 is larger than the diameter of the slide groove 4. The middle side of the end of the buffer plate 8 extends outward to form a mounting part 801, which cooperates with the mounting groove 5. Of course, the mounting groove 5 and the mounting part 801, like the aforementioned slide plate 701 and slide groove 4, are preferably used as a pair.

[0038] Understandably, during installation, the moving iron core 6 can first be installed by the cooperation of the sliding plate 701 and the sliding groove 4. Then, the mounting part 801 is inserted into the mounting groove 5, and the buffer pad 9 is installed. Finally, the end cover 2 can be bolted to the right end of the housing 1. After installation, the end cover 2 abuts against the buffer pad 9 to lock the buffer plate 8. The function of the mounting groove 5 is to hold the buffer pad 9 between the buffer plate 8 and the end cover 2.

[0039] Therefore, through the above structural design, during disassembly and assembly, only the bolts of the end cover 2 need to be tightened to install and fix the end cover 2, the moving iron core 6 and the buffer assembly. Similarly, during disassembly, only the end cover 2 needs to be removed, which greatly improves the disassembly and assembly efficiency.

[0040] In this embodiment, as Figure 3 As shown, the specific engagement between a coil 10 and two iron cores is as follows: the coil 10 can be sleeved around the core posts of both the stationary iron core 11 and the moving iron core 6. That is, the coil 10 can wrap around the core post of the stationary iron core 11 and extend to the right beyond the stationary iron core 11, with the extended portion reaching the outer side of the core post of the moving iron core 6. Regardless of how the moving iron core 6 slides, the coil 10 engages with the moving iron core 6. Of course, the depth of the inner cavity of the moving iron core 6 must be greater than the length of the coil 10 extending beyond the stationary iron core 11. In other words, when the moving iron core 6 engages with the stationary iron core 11, the inner cavity of the moving iron core 6 must provide space for the coil 10 to pass. For example, as... Figure 3 As shown, let the depth of the inner cavity of the moving iron core 6 be H, and the length of the coil 10 extending out of the stationary iron core 11 be L, then H is greater than L.

[0041] Another aspect of this application provides a phase selection switch (e.g., a 35kV vacuum contactor or a 35kV vacuum circuit breaker), such as Figure 5 As shown, the device includes the aforementioned magnetic control mechanism, as well as a vacuum interrupter 15, a sealing plate 12, and a transmission mechanism. The vacuum interrupter 15 is located on one side (left side) of the sealing plate 12, and the magnetic control mechanism is located on the other side (right side) of the sealing plate 12. The transmission mechanism passes through the sealing plate 12 and drives the vacuum interrupter 15 and the magnetic control mechanism. The vacuum interrupter 15 includes a moving contact 1502 and a stationary contact 1501. The transmission mechanism includes a connecting rod assembly 14, a tripping spring 16, an overtravel spring 17, a guide pad 19, and a spring pad 18. The connecting rod assembly 14 includes a guide rod 1403, an insulating pull rod 1401, and a moving rod 1402. The first end of the connecting rod assembly 14 is rigidly connected to the moving contact 1502, and the second end of the connecting rod assembly 14 is movably connected to the moving iron core 6. The second end of the connecting rod assembly 14 passes through the stationary iron core 11 and the moving iron core 6. The tripping spring 16 and the overtravel spring 17 are both located in the middle section of the connecting rod assembly 14. Figure 6 As shown, the magnetic control mechanism also includes a guide tube 3. The guide tube 3, guide pad 19, and spring pad 18 are all sleeved on the outside of the connecting rod assembly 14. The overtravel spring 17 is located between the guide pad 19 and the spring pad 18. The spring pad 18 abuts against the middle section of the connecting rod assembly 14. The guide tube 3 passes through the stationary iron core 11 and its first end (i.e., the left end) abuts against the guide pad 19. The second end (i.e., the right end) of the guide tube 3 abuts against the moving iron core 6. The two ends of the opening spring 16 cooperate with the guide pad 19 and the sealing plate 12, respectively, while the overtravel spring 17 is located inside the opening spring 16.

[0042] like Figure 6As shown, the overtravel spring 17 is in a pre-compressed state, and its compression chain is as follows: the left spring pad 18 of the overtravel spring 17, the moving rod 1402, the guide rod 1403, the screw at the right end of the guide rod 1403, the moving iron core 6, the guide tube 3, and the guide pad 19 (located to the right of the overtravel spring 17). It should be noted that the above-mentioned follow-up connection means that when the moving iron core 6 moves, it can drive the connecting rod assembly 14 to move synchronously through the guide tube 3 and the guide pad 19. However, the connecting rod assembly 14 and the moving iron core 6 are in a plug-in movable fit, and the two are not in a fixed connection fit.

[0043] Understandably, when the phase selection switch is closed, the magnetic control mechanism is energized. The moving iron core 6 moves closer to the stationary iron core 11 under magnetic force. The moving iron core 6 in the magnetic control mechanism then pushes the guide pad 19 to the left through the guide tube 3. The guide pad 19, through the overtravel spring 17 and the spring pad 18, pushes the connecting rod assembly 14, causing the moving and stationary contacts to close. At this time, the opening spring 16 is compressed. After the stationary contact 1501 and the moving contact 1502 contact, the moving contact 1502 stops moving, but the moving iron core 6 continues to push the guide tube 3 to the left, compressing the overtravel spring 17 until the moving iron core 6 completes its action. The compression distance of the overtravel spring 17 is the overtravel value, typically adjusted to 3.5-5mm. Its purpose is to buffer the impact force and compensate for the wear of the contacts; we know that the position of the moving iron core 6 is fixed after it is closed, so the connecting rod assembly 14 will slide relative to the moving iron core 6, as shown in the figure. At this time, a visible overtravel distance L will be formed between the second end of the connecting rod assembly 14 and the moving iron core 6. This value is the compression increment of the overtravel spring 17 on the basis of pre-compression. We can then measure this distance with a tool (such as a vernier caliper).

[0044] It should be understood that after frequent operation of the phase selection switch, the stationary contact 1501 and the moving contact 1502 will experience certain electrical and mechanical wear. The overtravel distance L will gradually decrease. When the actual overtravel distance L is less than 1mm, it indicates that the wear of the stationary and moving contacts 1501 within the switch's vacuum interrupter 15 is severe, allowing for timely inspection and maintenance. For example, if the predetermined overtravel distance L is 3.5-5mm, and the actual measured overtravel is 1mm, it indicates severe contact wear, requiring maintenance. Therefore, observing the overtravel of the phase selection switch during closing can indirectly determine the contact wear condition, enabling timely maintenance and replacement to ensure the normal operation of the switchgear and the safe and stable operation of the power grid.

[0045] Understandably, during closing, the overtravel spring 17 can buffer the impact force during closing, reducing the bounce of the moving contact 1502. However, when the moving and stationary contacts within the vacuum interrupter 15 wear down, such as... Figure 7 As shown, the guide pad 19 is fixed in position under the rigid support of the guide tube 3, that is, the right end of the overtravel spring 17 is fixed. Therefore, the left end of the compressed overtravel spring 17 will act on the spring pad 18, and the spring pad 18 will push the connecting rod assembly 14 to move to the left, thereby compensating for the wear of the moving and stationary contacts 1501. Of course, at this time, the overtravel distance L will become smaller. When opening, the coil 10 is supplied with a pulse current opposite to that of closing. At this time, the magnetic force of the stationary iron core 11 and the moving iron core 6 in the magnetic control mechanism is canceled out. The moving iron core 6 will lose its magnetic force, and then the opening spring 16 will act on the guide pad 19, the guide pad 19 will act on the guide tube 3, and the guide tube 3 will act on the moving iron core 6 to move to the right and open the circuit. Of course, when the opening action begins, the overtravel spring 17 will first return to the initial pre-compression state. At this time, there is a rightward pushing force on the guide pad 19, which increases the opening speed of the moving contact 1502 in the vacuum interrupter 15 and increases the opening speed of the switch.

[0046] In one embodiment of this application, such as Figure 5 and Figure 6 As shown, in order to further improve the protection and support effect of the vacuum interrupter 15, a solid-sealing pole 13 can be installed on one side of the sealing plate 12, and the vacuum interrupter 15 is located inside the solid-sealing pole 13; the specific installation method of the connecting rod assembly 14 is as follows: the insulating pull rod 1401 is located inside the solid-sealing pole 13 and its first end (left end) is connected to the moving contact 1502; the moving rod 1402 passes through the sealing plate 12 and its first end (left end) is connected to the second end (right end) of the insulating pull rod 1401; the second end (right end) of the moving rod 1402 is connected to the first end (left end) of the guide rod 1403 by thread; the second end (right end) of the guide rod 1403 and the moving iron core 6 form the above-mentioned overtravel distance L.

[0047] Specifically, such as Figure 5 As shown, a gas box is fixedly installed on the left side of the sealing plate 12. Of course, the solid sealing pole 13 is located inside the gas box. Insulating gas is installed inside the gas box, which can improve the insulation effect of the main circuit.

[0048] Specifically, the guide rod 1403, through a threaded connection, greatly improves convenience. For example, an internal hexagonal groove can be provided at the right end of the guide rod 1403; during the installation of the guide rod 1403, such as... Figure 5 and Figure 6 As shown, we can insert the guide rod 1403 from the tail section of the magnetic control mechanism, and after passing through the moving iron core 6, guide tube 3, guide pad 19, overtravel spring 17 and spring pad 18 in sequence, the left end of the guide rod 1403 will abut against the moving rod 1402 and then be screwed into the thread. At this time, the guide rod 1403 can be screwed in with an Allen wrench until it is tightened, and then the guide rod 1403 can be installed.

[0049] Furthermore, such as Figure 7 As shown, a shim can be fixedly installed on the outer right end of the guide rod 1403. The overtravel distance L is then the distance between the shim and the moving iron core 6. Using the shim as a reference facilitates measurement and improves accuracy. The shim also serves as a limit switch; for example, during circuit breaking, the moving iron core 6 can pull the connecting rod assembly 14 via the shim, while also preventing separation between the guide rod 1403 and the moving iron core 6.

[0050] As a further description of the above embodiment: the diameter of the guide rod 1403 is smaller than the diameter of the moving rod 1402, that is, the moving rod 1402 is thicker than the guide rod 1403; the left end of the guide rod 1403 is a threaded section, and the right end of the moving rod 1402 has a threaded groove, thereby achieving a threaded fit between the two. The guide tube 3, the guide pad 19, and the spring pad 18 are all sleeved on the outside of the guide rod 1403, and the connection between the guide rod 1403 and the moving rod 1402 forms the middle section of the connecting rod assembly 14. That is, the spring pad 18 is sleeved on the outside of the guide rod 1403 and abuts against the right end of the moving rod 1402, that is, the spring pad 18 abuts against the middle section of the connecting rod assembly 14, thereby enabling the spring pad 18 to push the connecting rod assembly 14 to move.

[0051] The advantages of this invention are: 1. The overtravel of the overtravel spring 17 can be observed and measured from the front of the magnetic control mechanism, facilitating timely maintenance and replacement; 2. The use of the magnetic control mechanism principle improves the reliability of the mechanism and reduces costs; 3. When applied to gas-insulated switchgear, the product size is greatly reduced compared to air-insulated switchgear.

[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 magnetic control mechanism, characterized by, include: case; A stationary iron core is disposed on the inner side of one end of the housing; A moving iron core, which is slidably disposed within the housing and corresponds to and cooperates with the stationary iron core; as well as A coil is connected to the inner side of one end of the housing and abuts against the stationary iron core, thereby locking the stationary iron core inside the housing. The coil is adapted to cooperate with the stationary iron core and the moving iron core. When the coil is energized, the moving iron core and the stationary iron core are adapted to be magnetized under the action of the coil, and the moving iron core is adapted to move under the action of magnetic force until it abuts against the stationary iron core; when the coil is de-energized, the moving iron core and the stationary iron core are adapted to maintain the attraction state with the stationary iron core under the action of residual magnetism.

2. The magnetic control mechanism of claim 1, wherein: A pressure plate is installed on the side of the moving iron core away from the stationary iron core. The middle side of the end of the pressure plate extends outward to form a sliding plate. A sliding groove is provided on the outer side of the housing. The sliding plate slides in conjunction with the sliding groove.

3. The magnetic control mechanism of claim 2, wherein: An end cap is detachably installed at the other end of the housing, and a buffer assembly is installed on the side of the end cap near the housing; when the moving iron core separates from the stationary iron core under the action of external force, the buffer assembly is adapted to absorb the separation impact force of the moving iron core.

4. The magnetic control mechanism of claim 3, wherein: The buffer assembly includes a buffer pad and a buffer plate, with the buffer pad disposed between the buffer plate and the end cap; the buffer pad is adapted to absorb impact energy through elastic deformation.

5. The magnetic control mechanism of claim 4, wherein: The other end of the housing is provided with a mounting groove communicating with the slide groove. The diameter of the mounting groove is larger than the diameter of the slide groove. The middle side of the end of the buffer plate extends outward to form a mounting part, which cooperates with the mounting groove. The end cover after installation is suitable for locking the buffer plate by the buffer pad.

6. The magnetic control mechanism as described in claim 1, characterized in that: The coil is sleeved outside the core posts of both the stationary iron core and the moving iron core, and the depth of the inner cavity of the moving iron core is greater than the length of the coil extending out of the stationary iron core.

7. A phase selection switch having multiple phases, characterized in that, Each phase includes the magnetic control mechanism as described in any one of claims 1-6, and further includes: A vacuum interrupter, comprising a moving contact and a stationary contact; and The transmission mechanism includes a linkage assembly, a trip spring, and an overtravel spring; the first end of the linkage assembly is rigidly connected to the moving contact, the second end of the linkage assembly is movably connected to the moving iron core, and the second end of the linkage assembly passes through the stationary iron core and the moving iron core; the trip spring and the overtravel spring are both located in the middle section of the linkage assembly. When the circuit is closed, the magnetic control mechanism is energized, and the moving iron core moves closer to the stationary iron core. The moving iron core then drives the moving contact to move closer to the stationary contact through the linkage assembly. At this time, the opening spring and the overtravel spring are compressed. After the circuit is closed, the linkage assembly and the moving iron core slide relative to each other under the action of the overtravel spring, and a visible overtravel distance is formed between the second end of the linkage assembly and the moving iron core.

8. The phase selection switch as described in claim 7, characterized in that: The phase selection switch also includes a sealing plate, the vacuum interrupter is disposed on one side of the sealing plate, the magnetic control mechanism is disposed on the other side of the sealing plate, and the transmission mechanism passes through the sealing plate and drives the vacuum interrupter and the magnetic control mechanism. The magnetic control mechanism further includes a guide tube, and the transmission mechanism further includes a guide pad and a spring pad. The guide tube, the guide pad, and the spring pad are all sleeved on the outside of the connecting rod assembly. The overtravel spring is located between the guide pad and the spring pad. The spring pad abuts against the middle section of the connecting rod assembly. The guide tube passes through the stationary iron core and its first end abuts against the guide pad. The second end of the guide tube abuts against the moving iron core. The two ends of the trip spring respectively cooperate with the guide pad and the sealing plate. The overtravel spring is located inside the trip spring. When the circuit is closed, the moving iron core is adapted to push the guide pad through the guide tube, and the guide pad is adapted to drive the linkage assembly to move through the overtravel spring and the spring pad, so as to realize the closure of the moving contact and the stationary contact.

9. The phase selection switch as described in claim 8, characterized in that: A solid-sealing pole is installed on one side of the sealing plate, and the vacuum interrupter is located inside the solid-sealing pole. The connecting rod assembly includes a guide rod, an insulating pull rod, and a moving rod. The insulating pull rod is located inside the solid-sealing pole and its first end is connected to the moving contact. The moving rod passes through the sealing plate and its first end is connected to the second end of the insulating pull rod. The second end of the moving rod is connected to the first end of the guide rod by a thread. The second end of the guide rod and the moving iron core form the aforementioned overtravel distance.

10. The phase selection switch as described in claim 9, characterized in that: The diameter of the guide rod is smaller than the diameter of the moving rod. The guide tube, the guide pad, and the spring pad are all sleeved on the outside of the guide rod. The connection between the guide rod and the moving rod forms the middle section of the connecting rod assembly.

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