Vacuum circuit breaker

Abstract

The invention belongs to the technical field of power systems, and particularly discloses a vacuum circuit breaker. The vacuum circuit breaker provided by the invention is provided with the coil mechanism, the coil of the coil mechanism can receive the pulse current output by the built-in capacitor of the protection relay when the main loop power supply is abnormal or loses power, the pulse current can enable the coil to generate the magnetic field, and the magnetic field enables the movable iron core assembly to move towards the opening half shaft and drives the opening half shaft to rotate. When the vacuum circuit breaker is in a passive state, the operating mechanism is opened, so that the opening of the vacuum circuit breaker is realized, the automatic opening of the vacuum circuit breaker in the passive state is realized, and the purpose of cutting off fault current in time is achieved; when the operating mechanism is switched off, the main shaft rotates to drive the reset mechanism to drive the movable iron core assembly to restore to the energy storage state from the state of driving the switching-off half shaft to rotate, and in the switching-off process, the reset mechanism can act along with the main shaft at the same time, and automatic reset of the movable iron core assembly is achieved through a mechanical structure, so that preparation is made for next passive switching-off.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a vacuum circuit breaker. Background Art

[0002] High-voltage vacuum circuit breakers are mainly used to open and close load current, overload current and short-circuit current in power systems. They are suitable for the control and protection of power systems (including power plants, substations, transmission and distribution lines, industrial and mining enterprises and other users).

[0003] The closing and opening coil is an important component of the vacuum circuit breaker to achieve the closing and opening functions. When the vacuum circuit breaker is powered on, the closing coil generates a magnetic field through electrical energy, converts the electrical energy into mechanical energy, and makes the armature of the closing coil hit the closing operating mechanism of the vacuum circuit breaker, so that the vacuum circuit breaker completes the closing function; similarly, the opening coil generates a magnetic field through electrical energy. When receiving the opening signal, the opening coil converts the electrical energy into mechanical energy, so that the impact rod of the opening coil hits the opening interlocking device of the vacuum circuit breaker to complete the opening function. The closing and opening coil can only generate a magnetic field by powering on, and then complete the closing or opening. If the circuit breaker is in a passive state, the opening coil cannot work, and the opening operation can only be performed manually, resulting in the circuit breaker being unable to open and cut off the fault current in time. Summary of the invention

[0004] The object of the present invention is to provide a vacuum circuit breaker which can automatically open the circuit breaker in a passive state to achieve the purpose of timely cutting off the fault current.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A vacuum circuit breaker, comprising:

[0007] The operating mechanism comprises a switch-off half-shaft, a main shaft and a transmission assembly for connecting the main shaft and the switch-off half-shaft;

[0008] The coil mechanism comprises a coil and a moving iron core assembly, wherein the coil is used to be electrically connected to an external protection relay, and the built-in capacitor of the protection relay can output a pulse current that causes the coil to generate a magnetic field when the main circuit power supply is abnormal or loses power. The moving iron core assembly drives the opening half shaft to rotate under the action of the magnetic field generated by the coil, so that the operating mechanism is in an opening state;

[0009] A reset mechanism, one end of the reset mechanism is connected to the main shaft, and the other end of the reset mechanism is a free end. During the opening process of the operating mechanism, the opening half-shaft rotates, and then the main shaft is driven to rotate through the transmission assembly. The rotation of the main shaft causes the other end of the reset mechanism to move toward the moving iron core assembly. At the moment when the operating mechanism opens, the other end of the reset mechanism touches the moving iron core assembly and drives the moving iron core assembly to move, and the moving iron core assembly recovers from the state of driving the opening half-shaft to rotate to the energy storage state.

[0010] As an optional technical solution of the above-mentioned vacuum circuit breaker, the vacuum circuit breaker also includes a frame and a fixed base, the fixed base includes a bottom plate and side plates arranged on both sides of the bottom plate, the bottom plate of the fixed base is connected to the frame, the coil mechanism is placed in the fixed base, and the coil mechanism is fixed to the two side plates of the fixed base.

[0011] As an optional technical solution for the above-mentioned vacuum circuit breaker, the coil mechanism also includes a shell, the coil is arranged in the shell, the shell includes a shell body, a shell plate is detachably connected between the two ends of the shell body, the shell body is placed in the fixed seat, the two side plates of the shell body are connected one by one with the two side plates of the fixed seat, and the first end of the moving iron core assembly is sequentially penetrated through the top of the shell body, the coil and the shell plate.

[0012] As an optional technical solution for the above-mentioned vacuum circuit breaker, the operating mechanism also includes a tripping bent plate, the tripping bent plate having a first bent end and a second bent end, the first bent end and the second bent end are bent in opposite directions, the first bent end is fixed to the side wall of the opening half-shaft, the second bent end is arranged below the moving iron core assembly and is opposite to the moving iron core assembly, and the moving iron core assembly can press the second bent end to rotate the opening half-shaft.

[0013] As an optional technical solution for the above-mentioned vacuum circuit breaker, the tripping bent plate includes a bent plate body, a first bent plate and a second bent plate, one end of the first bent plate is connected to one side of the bent plate body at an angle to form the first bent end, the side wall of the opening half-axis is provided with a bent plate connecting surface, the first bent plate is fitted and fixedly connected to the bent plate connecting surface, one end of the second bent plate is connected to the other side of the bent plate body at an angle to form the second bent end, and the other end face of the second bent plate is arranged opposite to the moving iron core assembly.

[0014] As an optional technical solution of the above-mentioned vacuum circuit breaker, the reset mechanism includes a reset component and a reset correction component, the reset component includes a reset shaft, the first end of the reset shaft is movably connected to the main shaft, and the reset correction component is connected to the reset shaft;

[0015] The second end of the reset shaft moves toward the moving iron core assembly during the process of the operating mechanism opening the gate, and the reset correction assembly makes the second end of the reset shaft touch the moving iron core assembly after the operating mechanism opens the gate, and drives the moving iron core assembly to move, so that the moving iron core assembly returns to the energy storage state.

[0016] As an optional technical solution for the above-mentioned vacuum circuit breaker, the reset assembly also includes a crank arm and a connecting plate, one end of the crank arm is fixed to the main shaft, the other end of the crank arm is provided with a first strip hole, one end of the connecting plate is provided with a second strip hole, the second strip hole and the first strip hole are connected by a hinge, and the other end of the connecting plate is fixed to the first end of the reset shaft.

[0017] As an optional technical solution for the above-mentioned vacuum circuit breaker, two connecting plates are provided, the crank arm is a plate-like structure, and the crank arm is arranged between the two connecting plates; the side wall of the first end of the reset shaft is provided with two connecting planes, and the two connecting planes are symmetrically arranged relative to the axis of the reset shaft. The first end of the reset shaft is placed between the two connecting plates, and the connecting plane is in contact with and fixedly connected to the connecting plates.

[0018] As an optional technical solution of the above-mentioned vacuum circuit breaker, the vacuum circuit breaker also includes a frame, the reset correction assembly includes a second elastic member, one end of the second elastic member is fixed to the reset shaft, a slide is fixed on the frame, the other end of the second elastic member is fixed to the slide, and the second elastic member is configured to be compressed when the operating mechanism is closed, and to apply elastic force to the reset shaft after the operating mechanism is opened.

[0019] As an optional technical solution for the above-mentioned vacuum circuit breaker, the slide seat includes a first plate, a second plate and a third plate, the two sides of the first plate are respectively connected to the second plate and the third plate, the first plate is fixed to the frame, the reset shaft passes through the second plate and the third plate in sequence along the moving direction of the moving iron core assembly, the second elastic member is sleeved on the reset shaft, one end of the second elastic member is fixed to the reset shaft, and the other end is fixed to the side wall of the slide seat.

[0020] As an optional technical solution for the above-mentioned vacuum circuit breaker, a fixing pin is provided on the reset shaft, one end of the fixing pin penetrates the reset shaft along the radial direction of the reset shaft, both ends of the fixing pin protrude from the surface of the reset shaft, and both sides of one end of the second elastic member are fixed to the two ends of the fixing pin.

[0021] Beneficial effects of the present invention:

[0022] The vacuum circuit breaker provided by the present invention is provided with a coil mechanism, the coil of the coil mechanism can receive the pulse current output by the built-in capacitor of the protection relay when the main circuit power supply is abnormal or power is lost, the pulse current can cause the coil to generate a magnetic field, the magnetic field causes the moving iron core assembly to move toward the opening half-shaft and drive the opening half-shaft to rotate, the operating mechanism opens, and then the vacuum circuit breaker is opened, realizing the automatic opening of the vacuum circuit breaker in a passive state, so as to achieve the purpose of timely cutting off the fault current; when the operating mechanism opens, the main shaft rotates and drives the reset mechanism to drive the moving iron core assembly from the state of driving the opening half-shaft to rotate to the energy storage state. During the opening process, the reset mechanism can move with the main shaft at the same time, and realize the automatic resetting of the moving iron core assembly through the mechanical structure, so as to prepare for the next passive opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a front view of the internal structure of a circuit breaker provided by an embodiment of the present invention;

[0024] Figure 2 is a schematic structural diagram of a coil mechanism provided by an embodiment of the present invention;

[0025] Figure 3 is an axial view of the internal structure of a circuit breaker provided by an embodiment of the present invention;

[0026] Figure 4 yes Figure 3 A schematic diagram of the enlarged local structure at A;

[0027] Figure 5 It is a schematic diagram of the connection structure of the frame, the fixing seat and the coil mechanism provided in an embodiment of the present invention;

[0028] Figure 6 is a structural schematic diagram of a tripping bent plate provided by an embodiment of the present invention from one perspective;

[0029] Figure 7 is a schematic structural diagram of a tripping bent plate provided by an embodiment of the present invention from another perspective;

[0030] Figure 8 is a side view of the internal structure of a circuit breaker provided by an embodiment of the present invention;

[0031] Fig. 9is an exploded view of a reset shaft and a connecting plate provided in an embodiment of the present invention;

[0032] Fig.10 It is a structural schematic diagram of the connection between the second elastic member and the reset shaft provided by an embodiment of the present invention.

[0033] In the figure:

[0034] 100. Protection relay;

[0035] 1. Operating mechanism; 2. Coil mechanism; 3. Reset mechanism; 4. Frame; 5. Fixed seat;

[0036] 11. Opening half shaft; 111. Bending plate connection surface; 12. Main shaft; 13. Tripping bending plate; 131. First bending end; 132. Second bending end; 133. Bending plate body; 134. First bending plate; 135. Second bending plate; 14. Transmission assembly; 141. Opening connecting rod assembly; 142. Transmission shaft; 143. Opening holding latch; 144. Closing holding latch; 145. Opening roller;

[0037] 21. Coil; 22. Moving iron core assembly; 221. Moving iron core; 222. Moving iron core collision block; 223. Limit block; 23. Magnet; 24. First elastic member; 25. Shell; 251. Shell body; 252. Shell plate;

[0038] 31. Reset assembly; 311. Reset shaft; 3111. Connecting plane; 312. Turning arm; 313. First strip hole; 314. Connecting plate; 315. Second strip hole; 316. Articulated member; 32. Reset and correction assembly; 321. Second elastic member; 322. Fixing pin; 33. Sliding seat; 331. First plate; 332. Second plate; 333. Third plate;

[0039] 51. Bottom plate; 52. Side plate. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0044] like Figure 1 and Figure 2As shown, this embodiment provides a vacuum circuit breaker, which is arranged on the main circuit of the power transmission and distribution equipment. The vacuum circuit breaker includes an operating mechanism 1, a coil mechanism 2 and a reset mechanism 3. The operating mechanism 1 includes a trip half-shaft 11, a main shaft 12 and a transmission assembly 14 for connecting the main shaft 12 and the trip half-shaft 11. The coil mechanism 2 includes a coil 21 and a moving iron core assembly 22. The coil 21 is used to be electrically connected to an external protection relay 100. The built-in capacitor of the protection relay 100 can output a pulse current that causes the coil 21 to generate a magnetic field when the main circuit power supply is abnormal or loses power. The moving iron core assembly 22 drives the trip half-shaft 11 to rotate under the action of the magnetic field generated by the coil 21, so that the operating mechanism 1 is in a trip state. One end of the reset mechanism 3 is connected to the main shaft 12, and the other end of the reset mechanism 3 is a free end. During the opening process of the operating mechanism 1, the opening half-shaft 11 rotates, and then drives the main shaft 12 to rotate through the transmission assembly 14. The rotation of the main shaft 12 causes the other end of the reset mechanism 3 to move toward the moving iron core assembly 22. At the moment when the operating mechanism 1 is opened, the other end of the reset mechanism 3 touches the moving iron core assembly 22 and drives the moving iron core assembly 22 to move, and the moving iron core assembly 22 is restored to the energy storage state from the state of driving the opening half-shaft 11 to rotate.

[0045] The vacuum circuit breaker provided in this embodiment is provided with a coil mechanism 2, and the coil 21 of the coil mechanism 2 can receive the pulse current output by the built-in capacitor of the protection relay 100 when the main circuit power supply is abnormal or power is lost. The pulse current can cause the coil 21 to generate a magnetic field, and the magnetic field causes the moving iron core assembly 22 to move toward the opening half-shaft 11 and drive the opening half-shaft 11 to rotate, and the operating mechanism 1 is opened, thereby realizing the opening of the vacuum circuit breaker, and realizing the automatic opening of the vacuum circuit breaker in a passive state, so as to achieve the purpose of timely cutting off the fault current; when the operating mechanism 1 is opened, the main shaft 12 rotates to drive the reset mechanism 3 to drive the moving iron core assembly 22 from the state of driving the opening half-shaft 11 to rotate to the energy storage state. During the opening process, the reset mechanism 3 can move with the main shaft 12 at the same time, and realize the automatic resetting of the moving iron core assembly 22 through the mechanical structure, so as to prepare for the next passive opening.

[0046] In some embodiments, the coil mechanism 2 further includes a magnet 23, which can adsorb the first end of the moving iron core assembly 22, and the magnetic field generated by the coil 21 can separate the first end of the moving iron core assembly 22 from the magnet 23 and trigger the opening half shaft 11. The magnet 23 adsorbs the moving iron core assembly 22 to fix the moving iron core assembly 22 in preparation for passive opening. The magnetic field generated when the coil 21 is energized can overcome the suction force of the magnet 23 adsorbing the moving iron core assembly 22, so that the moving iron core assembly 22 is separated from the magnet 23. Optionally, the magnet 23 is a permanent magnet.

[0047] The coil mechanism 2 also includes a first elastic member 24, which is disposed between the magnet 23 and the first end of the moving iron core assembly 22. When the magnet 23 adsorbs the first end of the moving iron core assembly 22, the first elastic member 24 is compressed. Since the pulse current output by the protection relay 100 when the main circuit power supply is abnormal or loses power is relatively weak, in order to achieve stable passive opening, the first elastic member 24 is disposed between the magnet 23 and the moving iron core assembly 22. When the magnet 23 adsorbs the moving iron core assembly 22, the first elastic member 24 is in an energy storage state. When the coil 21 is energized to generate a magnetic field, the magnetic field force and the elastic force released by the first elastic member 24 are superimposed to be greater than the adsorption force of the magnet 23, thereby enabling the moving iron core assembly 22 to stably and reliably trigger the opening half shaft 11, and the structure is simple and easy to implement.

[0048] The coil mechanism 2 also includes a housing 25, the first end of the moving iron core assembly 22 passes through the housing 25, and the first end and the second end of the moving iron core assembly 22 are placed on opposite sides of the housing 25, the coil 21, the magnet 23 and the first elastic member 24 are all sleeved on the outside of the moving iron core assembly 22, the coil 21 and the magnet 23 are placed inside the housing 25, the first elastic member 24 is placed outside the housing 25, and the two ends of the first elastic member 24 abut against the housing 25 and the first end of the moving iron core assembly 22. The moving iron core assembly 22 provides a guide for the elastic deformation of the first elastic member 24, and the coil 21 is arranged to wrap the moving iron core assembly 22, and the magnetic field force generated can effectively act on the moving iron core assembly 22. The magnet 23 is sleeved on the outside of the moving iron core assembly 22, which improves the compactness of the structure of the coil mechanism 2, enables the moving iron core assembly 22 to move in a straight line, and thus improves the accuracy of triggering the opening half shaft 11.

[0049] The vacuum circuit breaker further comprises a frame 4 , in which the operating mechanism 1 , the coil mechanism 2 and the reset mechanism 3 are all arranged.

[0050] Combination Figures 1 to 5 As shown, optionally, the vacuum circuit breaker further includes a fixing seat 5, the fixing seat 5 includes a bottom plate 51 and side plates 52 arranged on both sides of the bottom plate 51, and optionally, the bottom plate 51 and the two side plates 52 can form a U-shaped structure. The bottom plate 51 of the fixing seat 5 is connected to the frame 4, the coil mechanism 2 is placed in the fixing seat 5, and the coil mechanism 2 is fixed to the two side plates 52 of the fixing seat 5. The fixing seat 5 is provided to facilitate fixing the coil mechanism 2 to the frame 4. In addition, the fixing seat 5 is set in a U-shaped structure, which does not affect the action of the moving iron core assembly 22 of the coil mechanism 2, and has a simple structure.

[0051] Further optionally, the housing 25 includes a housing body 251, and a housing plate 252 is detachably connected between the two ends of the housing body 251. The housing body 251 is placed in the fixing seat 5, and the two side plates of the housing body 251 are connected to the two side plates of the fixing seat 5 in a one-to-one correspondence. The magnet 23 is arranged on the housing plate 252, and the coil 21 is arranged in the housing 25. Specifically, the coil 21 is arranged between the magnet 23 and the inner side wall of the housing body 251. The first end of the moving iron core assembly 22 is sequentially penetrated by the top of the housing body 251, the coil 21 and the housing plate 252, and the magnet 23 is arranged near the first end of the moving iron core assembly 22 to achieve stable and reliable adsorption of the moving iron core assembly 22. The first elastic member 24 abuts against the outer side of the housing plate 252. The housing plate 252 is detachably connected to the housing body 251, which is convenient for assembling the moving iron core assembly 22, the magnet 23 and the coil 21. The shell plate 252 and the shell body 251 can be plugged together. Specifically, plug-in blocks are respectively provided at opposite ends of the shell plate 252, and plug-in slots are provided at both ends of the shell body 251. The plug-in blocks are plugged into the plug-in slots. Optionally, the shell body 251 can be a U-shaped structure.

[0052] Optionally, the moving iron core assembly 22 includes a moving iron core 221 and a moving iron core collision block 222, the moving iron core 221 passes through the housing 25, the moving iron core collision block 222 is connected to the first end of the moving iron core 221, the outer diameter of the moving iron core collision block 222 is larger than the moving iron core 221, and the first elastic member 24 abuts against the moving iron core collision block 222, providing support for fixing the first elastic member 24. When assembling the coil mechanism 2, the magnet 23 can be first fixed to the shell plate 252, the first elastic member 24 is sleeved on the moving iron core assembly 22, and the first end of the first elastic member 24 abuts against the moving iron core collision block 222, the second end of the moving iron core 221 passes through the housing plate 252 and the magnet 23, and then the coil 21 is sleeved on the moving iron core 221, the housing body 251 and the housing plate 252 are assembled, and the second end of the moving iron core 221 passes through the housing body 251. A limiting block 223 may also be connected to the second end of the moving iron core 221 . The outer diameter of the limiting block 223 is greater than the outer diameter of the moving iron core 221 , so as to prevent the moving iron core 221 from being separated from the housing 25 .

[0053] See also Figure 6 and Figure 7 As shown, the operating mechanism 1 also includes a tripping bent plate 13, the tripping bent plate 13 has a first bent end 131 and a second bent end 132, the first bent end 131 and the second bent end 132 are bent in opposite directions, the first bent end 131 is fixed to the side wall of the opening half shaft 11, the second bent end 132 is arranged below the moving iron core assembly 22 and is arranged opposite to the moving iron core assembly 22, the moving iron core assembly 22 can press the second bent end 132 to rotate the opening half shaft 11, and there will be no interference between the second bent end 132 and the reset mechanism 3, and they will not affect the contact with the moving iron core assembly 22.

[0054] Optionally, the tripping bent plate 13 includes a bent plate body 133, a first bent plate 134 and a second bent plate 135, one end of the first bent plate 134 is connected to one side of the bent plate body 133 at an angle to form a first bent end 131, the side wall of the opening half shaft 11 is provided with a bent plate connection surface 111, the first bent plate 134 is fitted and fixedly connected to the bent plate connection surface 111, one end of the second bent plate 135 is connected to the other side of the bent plate body 133 at an angle to form a second bent end 132, and the other end surface of the second bent plate 135 is arranged opposite to the moving iron core assembly 22. The structure of the tripping bent plate 13 is simple, and the pressing force of the moving iron core assembly 22 is transmitted to the opening half shaft 11 through the second bent plate 135, the bent plate body 133 and the first bent plate 134, so that the opening half shaft 11 rotates.

[0055] like Figure 1 , Figure 4 and Figure 8 As shown, the transmission assembly 14 includes an opening connecting rod assembly 141, a transmission shaft 142, an opening holding latch 143, a closing holding latch 144 and an opening roller 145. The opening connecting rod assembly 141 connects the opening half shaft 11 and the transmission shaft 142, the opening holding latch 143 is connected to the transmission shaft 142, the opening roller 145 is connected to the main shaft 12, the closing holding latch 144 is rotatably connected to the frame 4, and a third elastic member is provided between the closing holding latch 144 and the frame 4. When the vacuum circuit breaker is closed, the main shaft 12 rotates in a clockwise direction, one end of the closing holding latch 144 abuts against the opening roller 145, and the opening holding latch 143 abuts against the other end of the closing holding latch 144, so that one end of the closing holding latch 144 limits the opening roller 145, the third elastic member stores energy, and the vacuum circuit breaker is in a closed state. When the vacuum circuit breaker is opened, the opening holding latch 143 no longer presses against the other end of the closing holding latch 144, and the third elastic member drives the closing holding latch 144 to rotate, so that one end of the closing holding latch 144 no longer presses against the opening roller 145, and the main shaft 12 rotates counterclockwise, and the operating mechanism 1 is opened. Since the specific connection structures of the above-mentioned components and the other components of the operating mechanism 1 and the connection structures between them are all prior art, they are not described in detail here. When the vacuum circuit breaker realizes passive opening, the moving iron core assembly 22 triggers the second bent end 132 of the tripping bent plate 13, causing the opening half-shaft 11 to rotate. The opening half-shaft 11 rotates and drives the opening holding latch 143 to rotate through the opening connecting rod assembly 141 and no longer presses the other end of the closing holding latch 144. The third elastic member drives the closing holding latch 144 to rotate, so that one end of the closing holding latch 144 no longer presses the opening roller 145, and the main shaft 12 rotates counterclockwise, and the operating mechanism 1 realizes passive opening.

[0056] In some embodiments, the reset mechanism 3 includes a reset component 31 and a reset correction component 32. The reset component 31 includes a reset shaft 311. The first end of the reset shaft 311 is movably connected to the main shaft 12, and the reset correction component 32 is connected to the reset shaft 311. The second end of the reset shaft 311 moves toward the moving iron core component 22 during the opening process of the operating mechanism 1. After the operating mechanism 1 is opened, the reset correction component 32 makes the second end of the reset shaft 311 touch the moving iron core component 22 and drives the moving iron core component 22 to move, so that the moving iron core component 22 is driven to restore to the energy storage state. After the opening is in place, due to the deviation in the rotation angle of the main shaft 12, there may be a problem that the reset mechanism 3 does not contact the moving iron core assembly 22 or the moving iron core assembly 22 is not driven into place. Therefore, in order to solve this problem, a reset correction assembly 32 is provided, and the reset shaft 311 of the reset assembly 31 is movably connected with the main shaft 12. During the rotation of the main shaft 12, the reset shaft 311 can be driven to move toward the moving iron core assembly 22. After the operating mechanism 1 is in place, the reset correction assembly 32 will cause the reset shaft 311 to continue to move, so that the reset shaft 311 contacts the moving iron core assembly 22 and drives the moving iron core assembly 22 to return to the energy storage state. The setting of this structure ensures that the vacuum circuit breaker can reliably realize passive opening, and the resetting of the moving iron core assembly 22 can be realized only after the vacuum circuit breaker is opened, thereby ensuring the reliability of the opening and closing actions of the vacuum circuit breaker.

[0057] Optionally, continue to refer to Figure 4 As shown, the reset assembly 31 also includes a crank arm 312 and a connecting plate 314, one end of the crank arm 312 is fixed to the main shaft 12, the other end of the crank arm 312 is provided with a first strip hole 313, one end of the connecting plate 314 is provided with a second strip hole 315, the second strip hole 315 and the first strip hole 313 are connected by a hinge 316, the other end of the connecting plate 314 is fixed to the first end of the reset shaft 311, thereby realizing the hinge connection between the crank arm 312 and the connecting plate 314, and further realizing the movable connection between the main shaft 12 and the reset shaft 311.

[0058] Further optionally, in combination Figure 4 and Fig. 9 As shown, there are two connecting plates 314, and the crank arm 312 is a plate-shaped structure, and the crank arm 312 is arranged between the two connecting plates 314. The side wall of the first end of the reset shaft 311 is provided with two connecting planes 3111, and the two connecting planes 3111 are symmetrically arranged relative to the axis of the reset shaft 311. The first end of the reset shaft 311 is placed between the two connecting plates 314, and the connecting plane 3111 fits and is fixedly connected to the connecting plate 314. The setting of the connecting plane 3111 increases the connection area between the reset shaft 311 and the connecting plate 314. The two connecting plates 314 are provided, and the force applied to the reset shaft 311 and driving the reset shaft 311 to slide is more uniform, which ensures the smoothness of the sliding of the reset shaft 311, and further ensures the reliability of the passive opening of the vacuum circuit breaker.

[0059] The connecting plate 314 can be connected to the reset shaft 311 by bolts and nuts. The hinge 316 is provided with the second strip holes 315 on the two connecting plates 314 and the first strip holes 313 on the crank arm 312 .

[0060] In some other embodiments, the reset assembly 31 includes a gear and a rack, the gear is sleeved on the main shaft 12, the rack is slidably set on the frame 4, one end of the rack is meshed with the gear, and the other end of the rack is connected to the reset shaft 311.

[0061] Combination Figure 4 and Fig.10 As shown, the reset correction assembly 32 includes a second elastic member 321, one end of the second elastic member 321 is fixed to the reset shaft 311, a slide 33 is fixed on the frame 4, and the other end of the second elastic member 321 is fixed to the slide 33. The second elastic member 321 is configured to be compressed when the operating mechanism 1 is closed, and to apply elastic force to the reset shaft 311 after the operating mechanism 1 is opened, so that the reset shaft 311 moves toward the moving iron core assembly 22 and drives the moving iron core assembly 22 to return to the energy storage state. In the process of realizing passive opening, the main shaft 12 rotates counterclockwise, driving the connecting plate 314 and the reset shaft 311 to move toward the moving iron core assembly 22, and stops rotating after the main shaft 12 rotates to the opening position, and the second elastic member 321 releases the compressed energy storage to drive the reset shaft 311 to continue to move toward the moving iron core assembly 22, and at the same time drives the main shaft 12 to continue to rotate a certain angle through the connecting plate 314. The structure is simple, and the reliability of the opening and closing actions of the vacuum circuit breaker is improved.

[0062] Optionally, the slide 33 includes a first plate 331, a second plate 332 and a third plate 333, the two sides of the first plate 331 are connected to the second plate 332 and the third plate 333 respectively, the first plate 331 is fixed to the frame 4, the reset shaft 311 is sequentially arranged on the second plate 332 and the third plate 333 along the moving direction of the moving iron core assembly 22, the reset shaft 311 can move relative to the slide 33, and the slide 33 plays a guiding and limiting role in the movement of the reset shaft 311, so that the reset shaft 311 moves linearly. The second elastic member 321 is sleeved on the reset shaft 311, and the reset shaft 311 provides a guide for the expansion and contraction of the second elastic member 321. One end of the second elastic member 321 is fixed to the reset shaft 311, and the other end is fixed to the side wall of the slide 33. When closing the switch, the second elastic member 321 is compressed to store energy, and when opening the switch, the second elastic member 321 releases the stored energy to drive the reset shaft 311 to move. Optionally, the first plate 331 , the second plate 332 and the third plate 333 surround a sliding seat 33 to form a U-shaped structure.

[0063] Optionally, a fixing pin 322 is provided on the reset shaft 311, one end of the fixing pin 322 penetrates the reset shaft 311 along the radial direction of the reset shaft 311, and both ends of the fixing pin 322 protrude from the surface of the reset shaft 311, and one end of the second elastic member 321 is fixed to both ends of the fixing pin 322. The fixing pin 322 is provided to facilitate fixing the second elastic member 321 to the reset shaft 311.

[0064] In some other embodiments, the reset correction component 32 includes a first magnetic component and a second magnetic component, the first magnetic component is arranged on the reset shaft 311, and the second magnetic component is arranged on the frame 4. After the operating mechanism 1 is opened, the distance between the first magnetic component and the second magnetic component can allow the second magnetic component to absorb the first magnetic component, thereby driving the reset shaft 311 to continue to move toward the moving iron core component 22 and drive the moving iron core component 22 to return to the energy storage state. When the operating mechanism 1 is opened, the rotation of the main shaft 12 can overcome the magnetic attraction between the first magnetic component and the second magnetic component, so that the first magnetic component is separated from the second magnetic component.

[0065] Combined with the above structure, during the closing process of the vacuum circuit breaker provided by the present application, the main shaft 12 drives the crank arm 312 to rotate clockwise, the connecting plate 314 and the reset shaft 311 move in a direction away from the moving iron core assembly 22, and the second elastic member 321 is compressed to store energy. When the circuit breaker is in full closing position, the opening retaining latch 143 abuts against the other end of the closing retaining latch 144, so that one end of the closing retaining latch 144 limits the opening roller 145, the main shaft 12 no longer rotates, the vacuum circuit breaker is in the closing state, the first end of the moving iron core assembly 22 of the coil mechanism 2 is adsorbed by the magnet 23, the first elastic member 24 is compressed, and the coil mechanism 2 is in the energy storage state. The capacitor in the external protection relay 100 pre-stores a small amount of electric energy. When the main circuit power supply is abnormal or loses power, the built-in capacitor of the protection relay 100 will output a pulse current. The pulse current causes the coil 21 to generate a magnetic field force. The magnetic field force and the elastic force of the first elastic member 24 are superimposed, which is greater than the suction force of the magnet 23 to adsorb the moving iron core component 22. The moving iron core component 22 overcomes the suction force of the magnet 23 under the action of the magnetic field force and the elastic force of the first elastic member 24, and moves toward the tripping bent plate 13 and presses the tripping bent plate downward. The second bent end 132 of the main shaft 13 is bent, and then the opening half shaft 11 is driven to rotate. The opening half shaft 11 rotates to drive the opening connecting rod assembly 141 to move, and then the opening holding latch 143 is driven to rotate counterclockwise and no longer press the other end of the closing holding latch 144. The closing holding latch 144 rotates counterclockwise when not limited by the opening holding latch 143, so that one end of the closing holding latch 144 no longer presses the opening roller 145, and the main shaft 12 rotates counterclockwise, and the operating mechanism 1 realizes passive opening. When the main shaft 12 rotates in the counterclockwise direction, it also drives the crank arm 312 to rotate counterclockwise, and the connecting plate 314 and the reset shaft 311 move toward the moving iron core assembly 22. After the main shaft 12 rotates to the opening position, it stops rotating. At this time, the second elastic member 321 releases the elastic force to make the reset shaft 311 continue to move toward the moving iron core assembly 22 and touch the moving iron core assembly 22, and drive the moving iron core assembly 22 to return to the energy storage state. The present application realizes reliable opening of the vacuum circuit breaker in a passive state by providing a coil mechanism 2, and realizes automatic resetting of the moving iron core assembly 22 by utilizing the rotation of the main shaft 12 during opening through a mechanical connection structure, so as to prepare for the next passive opening.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A vacuum circuit breaker, characterized in that: include: An operating mechanism (1) comprises a switch-off half-shaft (11), a main shaft (12), and a transmission assembly (14) for transmission connection between the main shaft (12) and the switch-off half-shaft (11); The coil mechanism (2) comprises a coil (21) and a moving iron core assembly (22), wherein the coil (21) is used to be electrically connected to an external protection relay (100), and the built-in capacitor of the protection relay (100) can output a pulse current that causes the coil (21) to generate a magnetic field when the main circuit power supply is abnormal or loses power, and the moving iron core assembly (22) drives the opening half shaft (11) to rotate under the action of the magnetic field generated by the coil (21), so that the operating mechanism (1) is in an opening state; A reset mechanism (3), one end of the reset mechanism (3) is connected to the main shaft (12), and the other end of the reset mechanism (3) is a free end. During the opening process of the operating mechanism (1), the opening half shaft (11) rotates and drives the main shaft (12) to rotate through the transmission assembly (14). The rotation of the main shaft (12) causes the other end of the reset mechanism (3) to move toward the moving iron core assembly (22). At the moment when the operating mechanism (1) opens, the other end of the reset mechanism (3) touches the moving iron core assembly (22) and drives the moving iron core assembly (22) to move. The moving iron core assembly (22) is restored from the state of driving the opening half shaft (11) to rotate to the energy storage state.

2. The vacuum circuit breaker according to claim 1, characterized in that: The vacuum circuit breaker further comprises a frame (4) and a fixing seat (5); the fixing seat (5) comprises a bottom plate (51) and side plates (52) arranged on both sides of the bottom plate (51); the bottom plate (51) of the fixing seat (5) is connected to the frame (4); the coil mechanism (2) is arranged in the fixing seat (5); and the coil mechanism (2) is fixed to the two side plates (52) of the fixing seat (5).

3. The vacuum circuit breaker according to claim 2, characterized in that: The coil mechanism (2) further comprises a shell (25), the coil (21) being arranged in the shell (25), the shell (25) comprising a shell body (251), a shell plate (252) being detachably connected between the two ends of the shell body (251), the shell body (251) being placed in the fixing seat (5), the two side plates of the shell body (251) being connected one-to-one with the two side plates of the fixing seat (5), and the first end of the moving iron core assembly (22) being sequentially passed through the top end of the shell body (251), the coil (21) and the shell plate (252).

4. The vacuum circuit breaker according to claim 1, characterized in that: The operating mechanism (1) further comprises a tripping bent plate (13), the tripping bent plate (13) comprising a first bent end (131) and a second bent end (132), the first bent end (131) and the second bent end (132) being bent in opposite directions, the first bent end (131) being fixed to the side wall of the opening half shaft (11), the second bent end (132) being arranged below the moving iron core assembly (22) and being arranged opposite to the moving iron core assembly (22), the moving iron core assembly (22) being able to press against the second bent end (132) to rotate the opening half shaft (11).

5. The vacuum circuit breaker according to claim 4, characterized in that: The tripping bent plate (13) comprises a bent plate body (133), a first bent plate (134) and a second bent plate (135); one end of the first bent plate (134) is connected to one side of the bent plate body (133) at an angle to form the first bent end (131); a side wall of the opening half shaft (11) is provided with a bent plate connecting surface (111); the first bent plate (134) is fitted with and fixedly connected to the bent plate connecting surface (111); one end of the second bent plate (135) is connected to the other side of the bent plate body (133) at an angle to form the second bent end (132); and the other end face of the second bent plate (135) is arranged opposite to the moving iron core assembly (22).

6. The vacuum circuit breaker according to claim 1, characterized in that: The reset mechanism (3) comprises a reset component (31) and a reset correction component (32); the reset component (31) comprises a reset shaft (311); a first end of the reset shaft (311) is movably connected to the main shaft (12); and the reset correction component (32) is connected to the reset shaft (311); The second end of the reset shaft (311) moves toward the moving iron core assembly (22) during the process of the operating mechanism (1) opening the gate, and the reset correction assembly (32) causes the second end of the reset shaft (311) to touch the moving iron core assembly (22) after the operating mechanism (1) opens the gate, and drives the moving iron core assembly (22) to move, so that the moving iron core assembly (22) is restored to an energy storage state.

7. The vacuum circuit breaker according to claim 6, characterized in that: The reset assembly (31) further comprises a crank arm (312) and a connecting plate (314); one end of the crank arm (312) is fixed to the main shaft (12); the other end of the crank arm (312) is provided with a first strip hole (313); one end of the connecting plate (314) is provided with a second strip hole (315); the second strip hole (315) and the first strip hole are connected via a hinge (316); the other end of the connecting plate (314) is fixed to the first end of the reset shaft (311).

8. The vacuum circuit breaker according to claim 7, characterized in that: Two connecting plates (314) are provided, and the crank arm (312) is a plate-shaped structure, and the crank arm (312) is arranged between the two connecting plates (314); the side wall of the first end of the reset shaft (311) is provided with two connecting planes (3111), and the two connecting planes (3111) are symmetrically arranged relative to the axis of the reset shaft (311), and the first end of the reset shaft (311) is placed between the two connecting plates (314), and the connecting plane (3111) is in contact with and fixedly connected to the connecting plate (314).

9. The vacuum circuit breaker according to claim 7, characterized in that: The vacuum circuit breaker further comprises a frame (4); the reset correction assembly (32) comprises a second elastic member (321); one end of the second elastic member (321) is fixed to the reset shaft (311); a slide seat (33) is fixed to the frame (4); the other end of the second elastic member (321) is fixed to the slide seat (33); the second elastic member (321) is configured to be compressed when the operating mechanism (1) is closed, and to apply elastic force to the reset shaft (311) after the operating mechanism (1) is opened.

10. The vacuum circuit breaker according to claim 9, characterized in that: The slide seat (33) comprises a first plate (331), a second plate (332) and a third plate (333); the two sides of the first plate (331) are respectively connected to the second plate (332) and the third plate (333); the first plate (331) is fixed to the frame (4); the reset shaft (311) passes through the second plate (332) and the third plate (333) in sequence along the moving direction of the moving iron core assembly (22); the second elastic member (321) is sleeved on the reset shaft (311); one end of the second elastic member (321) is fixed to the reset shaft (311), and the other end is fixed to the side wall of the slide seat (33).

11. The vacuum circuit breaker according to claim 10, characterized in that: The reset shaft (311) is provided with a fixing pin (322), one end of the fixing pin (322) penetrates the reset shaft (311) along the radial direction of the reset shaft (311), both ends of the fixing pin (322) protrude from the surface of the reset shaft (311), and both sides of one end of the second elastic member (321) are fixed to the two ends of the fixing pin (322).

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