A phase selection switch

Abstract

The application discloses a phase selector switch, which has multiple phases, each phase comprising a vacuum interrupter, a magnetic control mechanism and a transmission mechanism, the vacuum interrupter comprising a moving contact and a stationary contact, the magnetic control mechanism comprising a moving iron core and a stationary iron core, and the transmission mechanism comprising a connecting rod assembly, a breaking spring and an overtravel spring; the first end of the connecting rod assembly is rigidly connected to the moving contact, the second end of the connecting rod assembly is connected to the moving iron core in a follow-up mode, and the second end of the connecting rod assembly passes through the stationary iron core and the moving iron core, and the breaking spring and the overtravel spring are arranged in the middle section of the connecting rod assembly. The application has the beneficial effect that the connecting rod assembly passes through the magnetic control mechanism, so that an overtravel distance is formed between the connecting rod assembly and the magnetic control mechanism, and the overtravel value of the contact overtravel spring after the factory delivery can be observed and measured, and the wear condition of the vacuum interrupter contact in the phase selector switch can be found in time in the later period.

Description

Technical Field

[0001] This application relates to the field of switchgear technology, and in particular to a phase-selective switch. Background Technology

[0002] Photovoltaic and wind power plants do not generate electricity at night or when there is no wind, but the step-up transformer remains connected to the grid. The transformer and other equipment continuously draw power from the grid, resulting in energy loss. This phenomenon is prevalent in various photovoltaic power plants in my country. Therefore, if the step-up transformer is disconnected from the grid by a controller during nighttime photovoltaic power plants or wind power plants in windless conditions, the problem of active and reactive power losses in the transformer under no-load conditions can be completely solved. This requires the control switch to be capable of frequent operation and to suppress inrush current, preventing the instantaneous inrush current from the transformer from impacting the grid when the control switch switches the transformer. Currently, conventional switches cannot meet these two requirements.

[0003] Currently, 12kV vacuum contactors are common in the market, while 35kV vacuum contactors are rarely used, as they are mostly air-insulated designs. In sealed gas-insulated environments, there are no similar products available. The advantages of gas-insulated switchgear are that, because the primary components are sealed in a gas chamber, they are not affected by salt spray, condensation, or contamination. However, existing phase-selective switches have the following shortcomings: the overtravel value of the contact overtravel spring cannot be observed or measured after leaving the factory, making it impossible to detect the wear of the vacuum interrupter contacts in a timely manner. Therefore, a new phase-selective switch is proposed to solve the above technical problems. Summary of the Invention

[0004] One of the objectives 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 phase-selective switch having multiple phases, each phase including a vacuum interrupter, a magnetic control mechanism, and a transmission mechanism. The vacuum interrupter includes a moving contact and a stationary contact. The magnetic control mechanism includes a moving iron core and a stationary iron core. 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, with the second end passing through the stationary iron core and the moving iron core. The tripping spring and the overtravel spring are both located in the middle section of the linkage assembly. When closing, 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 closing, 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.

[0006] 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.

[0007] Preferably, the magnetic control mechanism further includes a housing, a coil, and a buffer assembly. The housing is installed on the other side of the sealing plate and corresponds to the vacuum interrupter. The stationary iron core is installed inside the housing and close to the vacuum interrupter. The moving iron core is slidably disposed inside the housing and corresponds to the stationary iron core. The coil is installed inside the housing and cooperates with the moving iron core and the stationary iron core. The buffer assembly is installed on the other side of the housing. When closing, the coil is adapted to be energized first to excite the moving iron core and the stationary iron core, and then the moving iron core is adapted to move under the action of magnetic force until it abuts against the stationary iron core. Subsequently, the coil is adapted to be de-energized, at which time the moving iron core and the stationary iron core are adapted to maintain the attracted state with the stationary iron core under the action of residual magnetism. When opening, the moving iron core is adapted to move and reset under the action of the opening spring, and then the buffer assembly is adapted to absorb the reset impact force of the moving iron core.

[0008] 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.

[0009] 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.

[0010] Preferably, a through hole is formed at the point where the moving rod passes through the sealing plate, and a sealing assembly is provided between the through hole and the moving rod; the sealing assembly includes a bellows, a sealing ring, a pressure ring, and a mounting ring, the bellows is sleeved on the outside of the moving rod, the first end of the bellows is fixed to the outside of the moving rod, the second end of the bellows is located at the through hole and connected to the pressure ring, and the sealing ring is sleeved on the pressure ring; the mounting ring is fixedly installed on the other side of the sealing plate and abuts against the pressure ring, thereby the sealing ring is adapted to deform under the compression of the pressure ring and abut against one side of the sealing plate.

[0011] Preferably, a mounting base is installed on the other side of the sealing plate. The phase selection switch further includes an emergency manual tripping mechanism, which includes an operating handle, a main shaft, a connecting rod assembly, and multiple push plates. The operating handle is vertically mounted on the bottom of the mounting base and close to the side of the mounting base. The main shaft is horizontally mounted on the upper end of the mounting base and close to the sealing plate. The push plates are mounted on the main shaft and cooperate with the corresponding guide pads. The first end of the connecting rod assembly is connected to the operating handle, and the second end of the connecting rod assembly is connected to the main shaft. During emergency tripping, the operating handle is adapted to drive the main shaft to rotate through the connecting rod assembly, thereby causing the push plates to act on the guide pads. The guide tube is adapted to force the moving iron core and the stationary iron core to separate under the drive of the guide pads.

[0012] Preferably, the connecting rod assembly includes a first connecting rod and a second connecting rod. The first end of the first connecting rod is fixedly installed on the lower end of the main shaft. The first end of the second connecting rod is hinged to the bottom end of the operating handle. The second end of the first connecting rod is provided with a pin, and the second end of the second connecting rod is provided with a waist-shaped groove. The pin is adapted to the waist-shaped groove. When performing emergency tripping, the operating handle is adapted to rotate and drive the first end of the second connecting rod to move. Then, the first connecting rod is pulled by the second end of the second connecting rod to drive the main shaft to rotate synchronously.

[0013] Preferably, an indicator is movably mounted on the upper side of the mounting base, and the indicator is connected to the main shaft via a transmission assembly; the first connecting rod and the second connecting rod are connected by an elastic element, so that the push plate abuts against the guide pad under the action of elastic force; when the circuit is closed, the main shaft is adapted to rotate under the drive of the guide pad, thereby causing the indicator to move and be in a first state through the transmission assembly; when the circuit is opened, the main shaft is adapted to reverse and reset under the elastic force of the elastic element, thereby causing the indicator to move and be in a second state through the transmission assembly; after emergency opening, the operating handle is adapted to reverse and reset under the elastic force of the elastic element and retract to the side of the mounting base.

[0014] Preferably, the sign is rotatably mounted on the mounting base, and the transmission assembly includes a transmission rod one and a transmission rod two. The first end of the transmission rod one is fixedly mounted on the main shaft, the first end of the transmission rod two is rotatably mounted on the sign, and the second end of the transmission rod one is hinged to the second end of the transmission rod two.

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

[0016] (1) By setting the connecting rod assembly through the magnetic control mechanism, the present invention creates an overtravel distance between the connecting rod assembly and the magnetic control mechanism, allowing the overtravel size of the overtravel spring to be observed and measured from the front of the magnetic control mechanism, which facilitates timely detection of wear on the contacts of the vacuum interrupter inside the phase selection switch in the later stage.

[0017] (2) Unique magnetic control mechanism design. In the prior art, permanent magnet mechanism is used. The cost of permanent magnet material is high, and irreversible demagnetization may occur under high temperature, vibration and overload current conditions. However, the moving and fixed iron cores in the magnetic control operation mechanism of the application use new magnetic materials, which can be quickly energized and demagnetized. After energization, the material is a permanent magnetic material, and after demagnetization, it becomes a non-magnetic material. This improves the reliability of the mechanism and reduces the cost.

[0018] (3) It can be applied to gas-insulated switchgear, and the product size is greatly reduced compared to air-insulated switchgear.

[0019] (4) It has a manual emergency tripping function. The manual emergency tripping operation handle is connected to the main shaft through the labor-saving connecting rod group. When the external control system fails, the emergency tripping can be performed through this handle to improve safety. At the same time, the opening and closing can be displayed through the mechanical transmission of the indicator. This design is not only simple and intuitive, but also highly reliable and easy to maintain. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a front view of the phase selection switch of the present invention after the right side of the mounting base has been removed.

[0022] Figure 3 This is a schematic diagram of the emergency manual tripping mechanism of the present invention.

[0023] Figure 4 This is a side sectional view of the present invention.

[0024] Figure 5 This is a partial cross-sectional view of the phase selection switch of the present invention during opening.

[0025] Figure 6 This is a partial cross-sectional view of the phase selection switch of the present invention when it is closed.

[0026] Figure 7 This is a schematic diagram showing the emergency manual tripping mechanism of the present invention not being activated.

[0027] Figure 8 This is a schematic diagram of the emergency manual tripping mechanism of the present invention after activation.

[0028] Figure 9 This is a schematic diagram showing the movement of the operating handle and push plate during emergency tripping according to the present invention.

[0029] Figure 10 This is a schematic diagram illustrating the working principle of the signage of the present invention.

[0030] Figure 11 This is a schematic diagram of the magnetic control mechanism of the present invention when it is not powered on.

[0031] Figure 12 This is a schematic diagram of the magnetic control mechanism of the present invention when energized.

[0032] In the diagram: 1. Sealing plate; 2. Solid sealing pole; 3. Mounting base; 4. Magnetic control mechanism; 401. Housing; 402. Moving iron core; 403. Stationary iron core; 404. Coil; 405. Guide tube; 406. Buffer assembly; 4061. Buffer pad; 4062. Buffer pressure plate; 5. Emergency manual tripping mechanism; 501. Operating handle; 502. Connecting rod assembly; 5021. Connecting rod one; 5022. Connecting rod two; 503. Main shaft; 504. Push plate; 6. Indicator sign; 7. Transmission mechanism; 701. Connecting rod assembly; 701 1. Insulating pull rod; 7012. Moving rod; 7013. Guide rod; 702. Opening spring; 703. Overtravel spring; 704. Spring washer; 705. Guide washer; 8. Sealing assembly; 801. Bellows; 802. Pressure ring; 803. Sealing ring; 804. Mounting ring; 9. Vacuum interrupter; 901. Stationary contact; 902. Moving contact; 10. Limit switch; 11. Gasket; 12. Return spring; 13. Pin; 14. Waist groove; 15. Transmission assembly; 1501. Transmission rod one; 1502. Transmission rod two. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] In existing technologies, such as in 35kV phase-selecting contactors (or circuit breakers), an overtravel spring 703 is generally required in the phase-selecting switch. Its main functions are: to act as a closing buffer; to compensate for the wear of the contacts in the vacuum interrupter 9; and to increase the rigid opening speed of the moving contact 902 in the vacuum interrupter 9.

[0037] The inventors of this application have developed a phase selection switch, one embodiment of which is, for example... Figures 1 to 12 As shown, the device includes a vacuum interrupter 9, a magnetic control mechanism 4, a sealing plate 1, and a transmission mechanism 7. The vacuum interrupter 9 is located on one side (i.e., the left side) of the sealing plate 1, and the magnetic control mechanism 4 is located on the other side (i.e., the right side) of the sealing plate 1. The transmission mechanism 7 passes through the sealing plate 1 and drives the vacuum interrupter 9 and the magnetic control mechanism 4. It should be noted that the vacuum interrupter 9 mainly includes a moving contact 902 and a stationary contact 901, while the magnetic control mechanism 4 mainly includes a moving iron core 402, a stationary iron core 403, and a guide tube 405. The transmission mechanism 7 includes a connecting rod assembly 701, a trip spring 702, an overtravel spring 703, a spring washer 704, and a guide washer 705. The connecting rod assembly 701 includes a guide rod 7013, an insulating pull rod 7011, and a moving rod 7012. The first end of the connecting rod assembly 701 is rigidly connected to the moving contact 902, and the second end of the connecting rod assembly 701 is movably connected to the moving iron core 402. The second end of the connecting rod assembly 701 passes through the stationary iron core 403 and the moving iron core 402. The trip spring 702 and the overtravel spring 703 are both located in the middle section of the connecting rod assembly 701. Specifically, as shown... Figure 5 As shown, the guide tube 405, guide pad 705, and spring pad 704 are all sleeved on the outside of the connecting rod assembly 701. The overtravel spring 703 is located between the guide pad 705 and the spring pad 704. The spring pad 704 abuts against the middle section of the connecting rod assembly 701. The guide tube 405 passes through the stationary iron core 403 and its first end (i.e., the left end) abuts against the guide pad 705. The second end (i.e., the right end) of the guide rod 7013 abuts against the moving iron core 402. The two ends of the opening spring 702 cooperate with the guide pad 705 and the sealing plate 1, respectively, while the overtravel spring 703 is located inside the opening spring 702.

[0038] like Figure 5As shown, the overtravel spring 703 is in a pre-compressed state, and its compression chain is as follows: the left spring pad 704 of the overtravel spring 703, the moving rod 7012, the guide rod 7013, the screw at the right end of the guide rod 7013, the moving iron core 402, the guide tube 405, and the guide pad 705 (located to the right of the overtravel spring 703). It should be noted that the above-mentioned follow-up connection means that when the moving iron core 402 moves, it can drive the connecting rod assembly 701 to move synchronously through the guide tube 405 and the guide pad 705. However, the connecting rod assembly 701 and the moving iron core 402 are in a plug-in movable fit; they are not a fixed connection.

[0039] Understandably, when the phase selection switch is closed, the magnetic control mechanism 4 is energized. The moving iron core 402 moves closer to the stationary iron core 403 under magnetic force. The moving iron core 402 in the magnetic control mechanism 4 then pushes the guide pad 705 to the left through the guide tube 405. The guide pad 705, through the action of the overtravel spring 703 and the spring pad 704, pushes the connecting rod assembly 701, causing the moving and stationary contacts to close. At this time, the opening spring 702 is compressed. After the stationary contact 901 and the moving contact 902 make contact, the moving contact 902 stops moving, but the moving iron core 402 continues to push the guide tube 405 to the left, compressing the overtravel spring 703 until the moving iron core 402 completes its action. The compression distance of the overtravel spring 703 is the overtravel value, typically adjusted to 3.5-5mm. Its purpose is to buffer the impact force and compensate for wear on the contacts; however, we know that the position of the moving iron core 402 is fixed after closing, therefore the connecting rod assembly 701 will slide relative to the moving iron core 402, such as... Figure 6 As shown, at this time, a visible overtravel distance L will be formed between the second end of the connecting rod assembly 701 and the moving iron core 402. This value is the compression increment of the overtravel spring 703 on the basis of pre-compression. We can then measure this distance using a tool (such as a vernier caliper).

[0040] It should be understood that after frequent operation of the phase selection switch, the stationary contact 901 and the moving contact 902 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 severe wear of the stationary and moving contacts within the switch's vacuum interrupter 9, 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 allows for indirect assessment of contact wear, enabling timely maintenance and replacement to ensure the normal operation of the switchgear and the safe and stable operation of the power grid.

[0041] Understandably, during closing, the overtravel spring 703 can buffer the impact force during closing, reducing the bounce of the moving contact 902. However, when the moving and stationary contacts 901 inside the vacuum interrupter 9 wear, such as... Figure 6 As shown, the guide pad 705 is fixed in position under the rigid support of the guide tube 405, that is, the right end of the overtravel spring 703 is fixed. Therefore, the left end of the compressed overtravel spring 703 will act on the spring pad 704, and the spring pad 704 will push the connecting rod assembly 701 to move to the left, thereby compensating for the wear of the moving and stationary contacts 901. Of course, at this time, the overtravel distance L will become smaller. When opening, the coil 404 is supplied with a pulse current opposite to that of the closing. At this time, the magnetic forces of the stationary iron core 403 and the moving iron core 402 in the magnetic control mechanism 4 are canceled out. The moving iron core 402 will lose its magnetic force, and then the opening spring 702 will act on the guide pad 705, the guide pad 705 will act on the guide tube 405, and the guide tube 405 will act on the moving iron core 402 to move to the right and open the circuit. Of course, when the tripping action begins, the overtravel spring 703 will first reset to the initial pre-compression state. At this time, there is a rightward pushing force on the guide pad 705, which increases the rigid opening speed of the moving contact 902 in the vacuum interrupter 9 and increases the rigid opening speed of the switch.

[0042] In one embodiment of this application, such as Figure 5 and Figure 6 As shown, the magnetic control mechanism 4 also includes a buffer assembly 406. The housing 401 is installed on the other side of the sealing plate 1 and corresponds to the vacuum interrupter 9. The stationary iron core 403 is installed on one side inside the housing 401 and close to the vacuum interrupter 9 (i.e., the left side inside the housing 401). The moving iron core 402 is slidably disposed inside the housing 401 and corresponds to the stationary iron core 403. The coil 404 is installed on one side inside the housing 401 and cooperates with the moving iron core 402 and the stationary iron core 403. The buffer assembly 406 is installed on the other side inside the housing 401 (i.e., the right side inside the housing 401).

[0043] Specifically, coil 404 is installed inside the left side of housing 401, and coil 404 can wrap around the core post of stationary iron core 403 and extend to the right of stationary iron core 403, with the extended part extending to the outer side of the core post of moving iron core 402. Therefore, when excitation coil 404 is energized, it can simultaneously excite both iron cores, thereby forming a magnetic force that attracts them together.

[0044] For example, such as Figure 5 and Figure 11As shown, this is the open state of the phase selection switch. At this time, the moving iron core 402 is located inside the housing 401 on the right side under the action of the opening spring 702, with the two iron cores far apart. When closing, a positive closing pulse current can be supplied to the excitation coil 404, thereby energizing the moving iron core 402 and the stationary iron core 403 to generate magnetic force. Therefore, under the action of magnetic force, the moving iron core 402 will move to the left until it is attracted to the stationary iron core 403 to complete the closing process. Figure 6 and Figure 12 As shown. When the excitation current disappears, the two iron cores can remain attracted to each other by residual magnetism. This eliminates the need for a continuous current supply to the coil 404 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 404, causing the magnetic force between the moving iron core 402 and the stationary iron core 403 to disappear. Under the action of the opening spring 702, the moving iron core 402 will return to the open position, completing the opening action.

[0045] We know that when the moving iron core 402 is tripped and reset, the tripping spring 702 releases energy instantaneously, causing the moving iron core 402 to quickly move to the right and separate from the stationary iron core 403. At this time, the moving iron core 402 will move to the right and impact the inside right side of the housing 401. Therefore, the buffer assembly 406 installed on the inside right side of the housing 401 will absorb the reset impact force of the moving iron core 402, thereby greatly improving the service life of the magnetic control mechanism 4.

[0046] Specifically, such as Figure 12 As shown, the buffer assembly 406 includes a buffer pad 4061 and a buffer pressure plate 4062. The buffer pad 4061 can be made of rubber, while the buffer pressure plate 4062 can be made of stainless steel. A stainless steel plate can also be installed on the right side of the moving iron core 402. The edge of this stainless steel plate protrudes to engage with a groove on the housing 401 to prevent the moving iron core 402 from rotating, thereby preventing the fasteners on the transmission chain from loosening. Therefore, during the opening of the circuit breaker, the two stainless steel plates will collide. At this time, the buffer pad 4061 will absorb the impact force, thereby reducing the direct impact between the moving iron core 402 and the housing 401 and extending the service life of the magnetic control mechanism 4.

[0047] It should be noted that the moving iron core 402 and the stationary iron core 403 can be made of materials with suitable semi-hard magnetism, that is, to ensure that after the excitation current disappears, the moving iron core 402 and the stationary iron core 403 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.

[0048] In one embodiment of this application, such as Figures 4 to 6As shown, in order to further improve the protection and support effect of the vacuum interrupter 9, a solid-sealing pole 2 can be installed on one side of the sealing plate 1, and the vacuum interrupter 9 is located inside the solid-sealing pole 2; the specific installation method of the connecting rod assembly 701 is as follows: the insulating pull rod 7011 is located inside the solid-sealing pole 2 and its first end (left end) is connected to the moving contact 902, the moving rod 7012 passes through the sealing plate 1 and its first end (left end) is connected to the second end (right end) of the insulating pull rod 7011, the second end (right end) of the moving rod 7012 is connected to the first end (left end) of the guide rod 7013 by thread, and the second end (right end) of the guide rod 7013 and the moving iron core 402 form the above-mentioned overtravel distance L.

[0049] Specifically, the guide rod 7013, through its threaded engagement, greatly improves convenience. For example: Figure 3 As shown, an internal hexagonal slot can be provided at the right end of the guide rod 7013; when installing the guide rod 7013, as follows: Figure 5 and Figure 6 As shown, we can insert the guide rod 7013 from the tail section of the magnetic control mechanism 4, and after passing through the moving iron core 402, guide tube 405, guide pad 705, overtravel spring 703 and spring pad 704 in sequence, the left end of the guide rod 7013 will abut against the moving rod 7012 and then be screwed into the thread. At this time, the guide rod 7013 can be screwed in with an Allen wrench until it is tightened, and then the guide rod 7013 can be installed.

[0050] Furthermore, such as Figure 3 and Figure 6 As shown, a shim 11 can be fixedly installed on the outer right end of the guide rod 7013. The overtravel distance L is then the distance between the shim 11 and the moving iron core 402. Using the shim 11 as a reference facilitates measurement convenience and accuracy. The shim 11 also serves as a limit switch. For example, during circuit breaking, the moving iron core 402 can pull the connecting rod assembly 701 through the shim 11, while also preventing separation between the guide rod 7013 and the moving iron core 402.

[0051] As a further description of the above embodiment: the diameter of the guide rod 7013 is smaller than the diameter of the moving rod 7012, that is, the moving rod 7012 is thicker than the guide rod 7013; the left end of the guide rod 7013 is a threaded section, and the right end of the moving rod 7012 has a threaded groove, thereby achieving a threaded fit between the two. The guide tube 405, the guide pad 705, and the spring pad 704 are all sleeved on the outside of the guide rod 7013, and the connection between the guide rod 7013 and the moving rod 7012 forms the middle section of the connecting rod assembly 701. That is, the spring pad 704 is sleeved on the outside of the guide rod 7013 and abuts against the right end of the moving rod 7012, that is, the spring pad 704 abuts against the middle section of the connecting rod assembly 701, thereby enabling the spring pad 704 to push the connecting rod assembly 701 to move.

[0052] In this embodiment, as Figure 5 The moving rod 7012 and the sealing plate 1 pass through a through hole, and a sealing assembly 8 is provided between the through hole and the moving rod 7012. The sealing assembly 8 includes a bellows 801, a sealing ring 803, a pressure ring 802 and a mounting ring 804. The bellows 801 is fitted and sealed to the outside of the moving rod 7012. The first end (left end) of the bellows 801 is sealed and welded to the outside of the moving rod 7012. The second end (right end) of the bellows 801 is located in the through hole and connected to the pressure ring 802. The sealing ring 803 is fitted onto the pressure ring 802. The mounting ring 804 is fixedly installed on the other side of the sealing plate 1 by bolts and abuts against the pressure ring 802. Thus, the sealing ring 803 is adapted to deform under the compression of the pressure ring 802 and abut against one side of the sealing plate 1.

[0053] Understandably, due to the presence of perforations, the sealing assembly 8 is designed to improve the sealing performance between the solid-sealed pole 2 and the sealing plate 1. The right end of the bellows 801, through the sealing ring 803, pressure ring 802, and mounting ring 804, further achieves sealing on both sides of the sealing plate 1. The purpose of including the bellows 801 is that it possesses a certain degree of flexibility, and the opening and closing states of the phase-selective switch require the movement of the connecting rod assembly 701. The bellows 801 ensures a tight seal without interfering with the movement of the connecting rod assembly 701. Therefore, the design of the sealing assembly 8 and the bellows 801 plays a crucial role in improving the sealing performance and reliability of the phase-selective switch.

[0054] Specifically, such as Figure 4 As shown, a gas box is fixedly installed on the left side of the sealing plate 1. Of course, the solid sealing pole 2 is located inside the gas box. Insulating gas is installed inside the gas box, which can improve the insulation effect of the main circuit.

[0055] In this application, both the magnetic control mechanism 4 and the vacuum interrupter 9 are preferably three in number and arranged in a straight line at equal intervals. Figure 1 and Figure 3As shown, each vacuum interrupter 9 corresponds to a magnetic control mechanism 4, and the three phases in the circuit are controlled by their respective magnetic control mechanisms 4, thus enabling phase selection for opening and closing. Specifically, as... Figure 5 As shown, a limit switch 10 corresponding to the three magnetic control mechanisms 4 can be installed in the phase selection switch. When the circuit is open, the limit switch 10 is not triggered; when the circuit is closed, the limit switch 10 of each of the three phases outputs a signal to the phase selection controller after the circuit is closed (the phase selection controller is installed in the cabinet instrument room and is not shown).

[0056] In one embodiment of this application, such as Figures 1 to 3 As shown, a mounting base 3 can be installed on the right side of the sealing plate 1. The phase selection switch also includes an emergency manual tripping mechanism 5. The emergency manual tripping mechanism 5 includes an operating handle 501, a main shaft 503, a connecting rod group 502, and multiple push plates 504. The operating handle 501 is vertically rotated and installed at the bottom of the mounting base 3 and close to the right side of the mounting base 3. The main shaft 503 is horizontally rotated and installed at the upper end of the mounting base 3 and close to the sealing plate 1. The push plates 504 are installed on the main shaft 503 and cooperate with the corresponding guide pads 705. The first end of the connecting rod group 502 is connected to the operating handle 501, and the second end of the connecting rod group 502 is connected to the main shaft 503.

[0057] It is understandable that, such as Figure 7 As shown, before emergency manual tripping, the operating handle 501 is in a vertical position; during emergency tripping, as... Figure 8 and Figure 9 As shown, when the operating handle 501 is rotated downwards (clockwise) away from the mounting base 3, the operating handle 501 can drive the main shaft 503 to rotate through the connecting rod group 502. The push plate 504 fixed on the main shaft 503 will rotate accordingly and push the guide pad 705. The guide pad 705 can push the iron core 402 to be forcibly separated from the fixed iron core through the guide tube 405, thereby realizing the emergency manual tripping operation.

[0058] This application does not specifically limit the structure of the connecting rod assembly 502, but the following specific embodiment is provided for reference:

[0059] like Figure 7As shown, the connecting rod assembly 502 includes connecting rod one 5021 and connecting rod two 5022. The first end (top) of connecting rod one 5021 is fixedly installed on the lower end of the outside of the main shaft 503. The first end (right end) of connecting rod two 5022 is hinged to the bottom end of the operating handle 501. Of course, the hinge point between connecting rod two 5022 and operating handle 501 does not coincide with the hinge point between operating handle 501 and mounting base 3. The two hinge points are misaligned. Specifically, a connecting block can be fixedly installed at the bottom end of operating handle 501. The bottom end of the connecting block is hinged to the mounting base 3, and the left end of the connecting block is hinged to connecting rod two 5022. The second end (bottom end) of connecting rod 1 5021 is movably connected to the second end (left end) of connecting rod 2 5022. The movable connection is as follows: a pin 13 is provided at the bottom end of connecting rod 1 5021, and a waist-shaped groove 14 is provided at the left end of connecting rod 2 5022. The pin 13 and the waist-shaped groove 14 cooperate, that is, the pin 13 can move along the length direction of the waist-shaped groove 14.

[0060] It is understandable that during emergency manual tripping, such as Figure 9 As shown, the operator can hold the operating handle 501 and turn it downwards. At this time, the connecting block will rotate along the hinge point at its bottom, which will cause the right end of the second connecting rod 5022 to rotate upwards. The left end of the second connecting rod 5022 will pull the bottom end of the first connecting rod 5021 under its action (at this time, the pin 13 abuts against the left end of the inner side of the waist-shaped groove 14). The pulled connecting rod 5021 will drive the main shaft 503 to rotate (counterclockwise), and then perform emergency manual tripping through the cooperation of the push plate 504 and the guide pad 705.

[0061] Furthermore, such as Figure 2 and Figure 10 As shown, the connection between link 1 5021 and link 2 5022 can be made by an elastic element. Specifically, the elastic element can be a return spring 12, such as... Figure 7 As shown, the left end of the return spring 12 is connected to the lower end of the first connecting rod 5021, and the right end of the return spring 12 is connected to the upper right end of the second connecting rod 5022. The return spring 12 is in a stretched state. We know that the operating handle 501 is generally in a vertical state and retracted to the side of the mounting base 3 when not in use. Therefore, the right end of the second connecting rod 5022 is essentially limited, and the return spring 12 will exert a pulling force on the first connecting rod 5021. In this way, the push plate 504 on the spindle 503 will always maintain a resisting state with the guide pad 705 under the action of the return spring 12.

[0062] In order to enable staff to observe the opening and closing status of the phase selection switch in real time, an indicator 6 can be movably installed on the right side of the mounting base 3, and the indicator 6 can be connected to the main shaft 503 through the transmission assembly 15.

[0063] It is understandable that the working principle of sign 6 is as follows: Figure 10 As shown, when the phase selection switch is closed, the main shaft 503 rotates under the push of the guide pad 705. The rotating main shaft 503 then acts on the indicator 6 through the transmission assembly 15, causing the indicator 6 to activate and enter the first state, as shown. Figure 10 The indicator 6 is shown by the dashed line. Similarly, when the phase selector switch is opened, the guide pad 705 will move away from the push plate 504 under the action of the opening spring 702. Therefore, the main shaft 503 will lose the pushing and squeezing action of the guide pad 705. At this time, under the action of the return spring 12, the main shaft 503 will reverse under the action of the elastic force and make the push plate 504 until it abuts against the guide pad 705. In this way, the main shaft 503 will still reverse and reset through the return spring 12. At this time, the indicator 6 will be activated again under the action of the transmission component 15 and will be in the second state, as shown by the solid line indicator 6 in the figure.

[0064] It should be noted that, as Figure 7 and Figure 8 As shown, when no emergency tripping is required, the operating handle 501 is in a vertical position and limited to the side of the mounting base 3; while under normal opening and closing conditions, the rotation of the main shaft 503 will not affect the state of the operating handle 501. This is because the waist-shaped groove 14 has a certain length, which provides sufficient space for the movement of the pin 13, so that the two have sufficient freedom of movement, and can move relative to each other without affecting the action of the connecting block and the operating handle 501.

[0065] It is worth mentioning that, such as Figure 8 As shown, the reset spring 12 not only resets the main shaft 503, but also has the following function: after emergency tripping, i.e., when the operating handle 501 is turned downwards, when the operator releases the operating handle 501, the reset spring 12 can reset the operating handle 501, thus returning it to the vertical retracted state.

[0066] As a further description of the above embodiments: such as Figure 10 As shown, the indicator 6 is rotatably mounted on the upper right side of the interior of the mounting base 3. The transmission assembly 15 includes a transmission rod 1501 and a transmission rod 1502. The first end (top) of the transmission rod 1501 is fixedly mounted on the main shaft 503, and the first end (right end) of the transmission rod 1502 is rotatably mounted on the indicator 6. The second end (bottom) of the transmission rod 1501 is hinged to the second end (left end) of the transmission rod 1502.

[0067] For example, to facilitate understanding of how sign 6 works, it is described below: Figure 2 and Figure 10 As shown, indicator 6 can be set with "1" and "0", where "1" represents open and "0" represents closed. And as... Figure 10 As shown by the solid line indicator 6, the circuit is currently in the open position. Therefore, the "1" on indicator 6 is positioned on the right side of the mounting base 3. Figure 1 and Figure 2 As shown, a window can be provided on the side of the mounting base 3, with "1" aligned with the window. When the circuit is closed, the main shaft 503 rotates clockwise, causing transmission rod 1501 to rotate synchronously. The bottom end of transmission rod 1501 pulls transmission rod 1502, which in turn pulls the indicator 6 to rotate clockwise (e.g., ...). Figure 10 As shown in the dotted line indicator 6, if the "0" on indicator 6 is directly facing the window, then it indicates that the circuit is closed.

[0068] Finally, it should be noted that this phase selection switch mainly refers to 35kV vacuum contactors and 35kV vacuum circuit breakers. Currently, 12kV vacuum contactors are more common in the market, while 35kV vacuum contactors are rarely used, and there are no reports on 35kV phase selection vacuum contactors. Existing phase selection vacuum circuit breakers generally use permanent magnet mechanisms, and the magnetic control mechanism 4 in this application is also rare. In existing vacuum contactors or vacuum circuit breakers, the overtravel value of the contact overtravel spring 703 cannot be observed or measured after leaving the factory. However, the design of this application can effectively solve the above-mentioned technical problems.

[0069] The advantages of this invention are: 1. The overtravel of the overtravel spring 703 can be observed and measured from the front of the magnetic control mechanism 4, facilitating timely maintenance and replacement; 2. The use of the magnetic control mechanism 4 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; 4. It has a manual emergency tripping function.

[0070] 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 phase selecting switch having a plurality of phases, characterized by, Each phase comprises: a vacuum interrupter comprising a moving contact and a stationary contact; a magnetic control mechanism comprising a moving iron core and a stationary iron core; and a transmission mechanism comprising a link assembly, a split spring and an over-travel spring; the first end of the link assembly is rigidly connected to the moving contact, the second end of the link assembly is connected to the moving iron core in a follow-up mode, and the second end of the link assembly passes through the stationary iron core and the moving iron core, the split spring and the over-travel spring are both arranged in the middle section of the link assembly; when closing, the magnetic control mechanism is powered, and then the moving iron core approaches the stationary iron core, the moving iron core drives the moving contact to approach the stationary contact through the link assembly, at this time the split spring and the over-travel spring are compressed; after closing, the link assembly and the moving iron core slide relative to each other under the action of the over-travel spring, and a visible over-travel distance is formed between the second end of the link assembly and the moving iron core; the phase selector switch further comprises a sealing plate, the vacuum interrupter is arranged on one side of the sealing plate, the magnetic control mechanism is arranged on the other side of the sealing plate, and the transmission mechanism passes through the sealing plate and is connected to the vacuum interrupter and the magnetic control mechanism; the magnetic control mechanism further comprises a guide tube, the transmission mechanism further comprises 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 link assembly, the over-travel spring is located between the guide pad and the spring pad, the spring pad is matched with the middle section of the link assembly, the guide tube passes through the stationary iron core and the first end is matched with the guide pad, the second end of the guide tube is matched with the moving iron core, the split spring is matched with the guide pad and the sealing plate at both ends, and the over-travel spring is located in the split spring; when closing, the moving iron core is adapted to push the guide pad through the guide tube, and then the guide pad is adapted to drive the link assembly to move through the over-travel spring and the spring pad, so as to realize the closing of the moving contact and the stationary contact.

2. The phase selecting switch according to claim 1, characterized in that: the magnetic control mechanism further comprises a shell, a coil and a buffer assembly, the shell is installed on the other side of the sealing plate and corresponds to the vacuum interrupter, the stationary iron core is installed on one side in the shell and approaches the vacuum interrupter, the moving iron core is slidably arranged in the shell and corresponds to the stationary iron core, the coil is installed on one side in the shell and matched with the moving iron core and the stationary iron core, and the buffer assembly is installed on the other side in the shell; when closing, the coil is adapted to be powered first to excite the moving iron core and the stationary iron core, and then the moving iron core is adapted to move under the action of magnetic force until it abuts against the stationary iron core; subsequently, the coil is adapted to be powered off, at this time the moving iron core and the stationary iron core are adapted to keep the attracted state with the stationary iron core under the action of residual magnetism; when opening, the moving iron core is adapted to move and reset under the action of the split spring, and then the buffer assembly is adapted to absorb the reset impact force of the moving iron core.

3. The phase selecting switch according to claim 2, characterized in that: The fixed sealing pole is installed on one side of the sealing plate, and the vacuum arc-extinguishing chamber is located in the fixed sealing pole; the connecting rod assembly comprises a guide rod, an insulating pull rod and a moving rod, the insulating pull rod is located in the fixed sealing pole and connected with the moving contact at the first end, the moving rod passes through the sealing plate and is connected with the second end of the insulating pull rod, the second end of the moving rod is connected with the first end of the guide rod through screw thread, and the second end of the guide rod and the moving iron core form the above-mentioned overtravel distance.

4. The phase selecting switch according to claim 3, 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 sleeved outside the guide rod, and the connection between the guide rod and the moving rod forms the middle section of the connecting rod assembly.

5. The phase selecting switch according to claim 4, characterized in that: The moving rod and the through hole of the sealing plate form a through hole, and a sealing assembly is arranged between the through hole and the moving rod; the sealing assembly comprises a bellows, a sealing ring, a compression ring and a mounting ring, the bellows is sleeved outside the moving rod, the first end of the bellows is fixed to the outside of the moving rod, the second end of the bellows is located in the through hole and connected with the compression ring, and the sealing ring is sleeved on the compression ring; the mounting ring is fixedly installed on the other side of the sealing plate and abuts against the compression ring, so that the sealing ring is deformed under the extrusion of the compression ring and abuts against one side of the sealing plate.

6. The phase selecting switch according to any of claims 1-5, characterized in that: The other side of the sealing plate is provided with a mounting base, and the phase selector switch further comprises an emergency manual opening mechanism, the emergency manual opening mechanism comprises an operating handle, a main shaft, a connecting rod group and a plurality of push plates, the operating handle is vertically rotatably installed in the mounting base through the bottom end and abuts against the side of the mounting base, the main shaft is horizontally rotatably installed in the upper end of the mounting base and abuts against the sealing plate, the push plate is installed on the main shaft and matched with the guide pad, the first end of the connecting rod group is connected with the operating handle, and the second end of the connecting rod group is connected with the main shaft. When the emergency opening is performed, the operating handle is adapted to drive the main shaft to rotate through the connecting rod group, so that the push plate acts on the guide pad, and the guide tube is adapted to drive the moving iron core to forcibly separate from the static iron core under the action of the guide pad.

7. The phase selecting switch of claim 6, wherein: The connecting rod group comprises a connecting rod one and a connecting rod two, the first end of the connecting rod one is fixedly installed on the lower end outside the main shaft, the first end of the connecting rod two is hingedly connected with the bottom end of the operating handle, the second end of the connecting rod one is provided with a pin, and the second end of the connecting rod two is provided with a waist-shaped groove, the pin is matched with the waist-shaped groove. When the emergency opening is performed, the operating handle is adapted to rotate and drive the first end of the connecting rod two to move, so that the connecting rod one drives the main shaft to synchronously rotate under the pulling of the second end of the connecting rod two.

8. The phase selecting switch of claim 7, wherein: An indicator is movably installed on the upper end of the side of the mounting base, and the indicator and the main shaft are connected through a transmission assembly; the connecting rod one and the connecting rod two are connected through an elastic member, so that the push plate abuts against the guide pad under the action of the elastic force. In the closing, the main shaft is adapted to rotate under the drive of the guide pad, and then through the transmission assembly to make the sign move and be in the first state; in the opening, the main shaft is adapted to reverse and reset under the elastic force of the elastic member, and then through the transmission assembly to make the sign move and be in the second state; after the emergency opening, the operating handle is adapted to reverse and reset under the elastic force of the elastic member and be retracted in the side of the mounting base.

9. The phase selecting switch of claim 8, wherein: The sign is rotatably installed on the mounting base, the transmission assembly comprises a transmission rod one and a transmission rod two, the first end of the transmission rod one is fixedly installed on the main shaft, the first end of the transmission rod two is rotatably installed on the sign, and the second end of the transmission rod one is hingedly connected with the second end of the transmission rod two.

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