CN112768289A - Fault current trigger device and vacuum circuit breaker - Google Patents

Abstract

The invention provides a fault current trigger device and a vacuum circuit breaker with the same, wherein the fault current trigger device comprises an electromagnetic tripping trigger and a thermal tripping trigger, and the electromagnetic tripping trigger comprises: the magnetic yoke is sleeved on the outer periphery of the wiring board and provided with an opening, the armature is over against the opening of the magnetic yoke and is parallel to the opening of the magnetic yoke with a certain gap, the damping piece applies resistance to the armature to prevent the armature from moving towards the direction of the magnetic yoke, and the ejector rod is fixedly connected with the armature and corresponds to a traction rod of the tripping device; the thermal trip trigger comprises a magnetic induction heating assembly arranged on the wiring board and a bimetallic strip connected with the magnetic induction heating assembly, and the bimetallic strip corresponds to the traction rod of the trip device. The circuit breaker can be well suitable for being used on a high-current (more than 800A current) circuit breaker.

Description

Fault current trigger device and vacuum circuit breaker

Technical Field

The invention relates to the field of circuit breakers, in particular to a fault current trigger device and a vacuum circuit breaker with the same.

Background

The circuit breaker is used for controlling a circuit, when the circuit is in fault, the circuit is cut off through the action of the tripping device, the circuit and the load on the circuit are protected, and the tripping device is triggered through the fault current triggering device arranged on the wiring board.

The structure shown in fig. 1 is a typical fault current triggering device, which is commonly used in molded case circuit breakers, and is generally used for circuit breakers with current of 800A and below, a conductive plate 1 is connected in series with a thermal element 2, an electromagnetic trip triggering part and a thermal trip triggering part are both arranged on the thermal element 2, and a bimetallic strip 4 of the thermal trip triggering part is directly connected with the thermal element 2 and is used for long-delay overload trip; the electromagnetic tripping triggering part adopts a clapper type structure, namely, the armature 3 is pivoted, a magnetic field generated when the current of a wiring board is overlarge attracts the armature 3, and the armature 3 strikes a traction plate of the tripping device through swinging to trigger the tripping device for short-circuit instantaneous tripping; in the structure, the thermal element 2 is equivalent to a resistor, self-heating is generated in the conductive process, and in addition, the conductive connection is realized at two ends of the conductive plate 1 and the thermal element 2 by generally adopting a screw compression joint or direct welding mode, so that the contact resistance between parts is large, the heating is large, and the temperature rise is fast, so the structure cannot be generally used in a circuit breaker with the current of more than 800A. The existing circuit breaker with the current larger than 800A generally adopts an electronic tripping device, consists of a current transformer and an intelligent controller, and can realize functions, but the cost is greatly increased, and the product competitiveness is reduced.

Disclosure of Invention

To this end, the present invention provides a fault current trigger device suitable for a high current (greater than 800A current) circuit breaker and a vacuum circuit breaker having the same through structural improvement of an electromagnetic trip trigger and a thermal trip trigger.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

a fault current trigger device for triggering tripping of a trip device, comprising an electromagnetic trip trigger and a thermal trip trigger, the electromagnetic trip trigger comprising: the magnetic yoke is sleeved on the outer periphery of the wiring board and provided with an opening, the armature is over against the opening of the magnetic yoke and is parallel to the opening of the magnetic yoke with a certain gap, the damping piece applies resistance to the armature to prevent the armature from moving towards the direction of the magnetic yoke, and the ejector rod is fixedly connected with the armature and corresponds to a traction rod of the tripping device; the thermal trip trigger comprises a magnetic induction heating assembly arranged on the wiring board and a bimetallic strip connected with the magnetic induction heating assembly, and the bimetallic strip corresponds to the traction rod of the trip device.

Further, the opening of the magnetic yoke is arranged downwards, and the armature is located below the opening of the magnetic yoke.

Furthermore, the ejector rod is vertically arranged, and a traction rod of the tripping device is over against the upper end part of the ejector rod.

Furthermore, the yoke is provided with a yielding hole corresponding to the ejector rod, the ejector rod penetrates through the yielding hole of the yoke, the upper end of the ejector rod is exposed out of the upper surface of the yoke, and the traction rod of the tripping device is located above the upper surface of the yoke.

Further, the upper end of ejector pin still is fixed with the conflict portion in the aperture that an external diameter is greater than the hole of stepping down of yoke, the unsettled setting of armature, armature and ejector pin are contradicted in the upper surface of yoke and are realized fixing a position through conflict portion.

Further, the collision part is a nut, and the nut is in threaded connection with the upper end part of the ejector rod.

Further, the damping member is an elastic damping member, and the elastic damping member applies an elastic resistance to the armature to prevent the armature from moving towards the yoke.

Furthermore, the elastic damping part is a spring, the spring is sleeved on the ejector rod, and two ends of the spring respectively abut against the magnetic yoke and the armature.

Further, the bimetal extends between the upper surface of the yoke and the traction rod.

Further, the magnetic induction heating assembly comprises: the magnetic collector comprises a magnetic collector body, a magnetic resistance sheet and a thermal element, wherein the magnetic collector body is of a U-shaped structure and is sleeved on the peripheral side of a wiring board, the magnetic resistance sheet is fixedly connected to an opening of the magnetic collector body to form an annular magnetic conduction structure, the thermal element is of an annular structure and is sleeved on the peripheral side of the magnetic resistance sheet, and the bimetallic sheet is connected with the thermal element.

The invention also provides a vacuum circuit breaker, which comprises an electromagnet, a connecting rod assembly, a vacuum arc extinguish chamber, a tripping device and the fault current trigger device, wherein the electromagnet is parallel to the vacuum arc extinguish chamber and forms transmission connection through the connecting rod assembly, the tripping device comprises a tripping mechanism and a draw bar, the tripping mechanism is connected to the connecting rod assembly in series, the fault current trigger device is positioned between the electromagnet and the vacuum arc extinguish chamber and arranged on a wiring board connected with the movable end of the vacuum arc extinguish chamber, and the draw bar is arranged between the fault current trigger device and the trigger end of the tripping mechanism.

Furthermore, link assembly includes and rotates support and push rod, it can rotate around a fulcrum to rotate the support, the electro-magnet passes through the one end that the push rod connects the rotation support, the other end that rotates the support is connected the end that moves of vacuum interrupter, a wiring board is connected respectively to the end that moves and quiet end of vacuum interrupter, and the extending direction of two wiring boards all parallels with the axial direction of push rod.

Furthermore, the tripping mechanism is connected in series with the push rod.

Through the technical scheme provided by the invention, the method has the following beneficial effects:

in the electromagnetic tripping trigger, an armature is parallel to an opening of a magnetic yoke, gaps at all positions between the armature and the opening are equal, an induced magnetic field is generated at the periphery of an electrified wiring board, magnetic lines of force in the magnetic field are concentrated into the magnetic yoke and the armature with high magnetic conductivity, when the current is increased to a certain value, the magnetic field intensity is enhanced, the generated magnetic field force overcomes the resistance applied by a damping piece to attract the armature, so that the armature translates, and the translation of the armature drives a mandril to move to hit a traction rod; the magnetic induction heating component of the thermal trip trigger generates heat through an induced magnetic field generated by the current of the wiring board. The electromagnetic tripping trigger and the thermal tripping trigger are both arranged on the wiring board, the current transmission of the wiring board is not influenced, the electromagnetic tripping trigger and the thermal tripping trigger can be well applied to a circuit breaker with large current (greater than 800A current), and the electromagnetic tripping trigger and the thermal tripping trigger are good in precision and high in reliability. The high-current circuit breaker can be triggered to release in a thermomagnetic mode, and the difficulty that the release is ensured by controlling the temperature rise of a main loop and increasing the temperature of a bimetallic strip in a thermal release trigger in the high-current circuit breaker is solved.

Drawings

Fig. 1 is a schematic structural diagram of a fault current trigger device typical in the prior art;

fig. 2 is a perspective view of a fault current triggering device in an embodiment;

FIG. 3 is a side view of the fault current trigger assembly of the embodiment;

FIG. 4 is a top view of the fault current trigger assembly of the embodiment;

FIG. 5 is an exploded view of a portion of an exemplary embodiment of a fault current trigger device;

fig. 6 is an assembly view showing the assembly of the fault current triggering apparatus to the vacuum circuit breaker in the embodiment;

FIG. 7 is an exploded view of the structure of FIG. 6;

fig. 8 is a schematic view showing an internal structure of a vacuum circuit breaker according to an embodiment;

fig. 9 is a schematic view of the trip mechanism in a latched state;

fig. 10 is a cross-sectional view of the trip mechanism in a latched state;

fig. 11 is a schematic view of the trip mechanism in a tripped state;

fig. 12 is a cross-sectional view of the trip mechanism in a tripped state.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 2 to 5, in the fault current trigger device provided in this embodiment, specifically, the fault current trigger device is applied to a vacuum circuit breaker and is used for triggering a trip device to trip, one end of a terminal block 11 of the circuit breaker is used for connecting a terminal of a load line, and the other end of the terminal block is connected to a moving end of a vacuum arc-extinguishing chamber through a flexible connection 12. Of course, in other embodiments, the applicable breaker types are not limited thereto.

The fault current trigger device comprises an electromagnetic tripping trigger 20 and a thermal tripping trigger 30, wherein the electromagnetic tripping trigger 20 comprises: the magnetic yoke 21 is sleeved on the outer periphery of the wiring board 11 and has an opening (not shown), specifically, the magnetic yoke 21 is in a U-shaped structure, the upper end opening of the U-shaped structure is the opening of the magnetic yoke 21, and of course, in other embodiments, the magnetic yoke 21 may have other structures. The armature 22 faces the opening of the magnetic yoke 21 and is parallel to the opening of the magnetic yoke 21 with a certain gap, the damping member 23 applies a resistance force to the armature 22 to prevent the armature 22 from moving towards the magnetic yoke 21, and the ejector rod 24 is fixedly connected with the armature 22 and corresponds to a traction rod (corresponding to a traction rod 72 shown in fig. 8) of the tripping device. An induced magnetic field is generated at the periphery of the electrified wiring board 11, magnetic lines of force in the magnetic field are concentrated in the magnetic yoke 21 and the armature 22 which are high in magnetic conductivity, when the current is increased to a certain value, the magnetic field intensity is enhanced, the generated magnetic field force overcomes the resistance applied by the damping piece 23 to attract the armature 22, the armature 22 is enabled to translate, the translation of the armature 22 drives the ejector rod 24 to move and strike the traction rod, and then the tripping device is triggered to trip. The armature 22 is parallel to the opening of the magnetic yoke 21, and the gaps between the armature and the yoke at all positions are equal, so that the precision control is better.

The thermal trip trigger 30 includes a magnetic induction heating assembly disposed on the wiring board 11 and a bimetal 34 connected to the magnetic induction heating assembly, and the bimetal 34 corresponds to a draw bar of the trip device. The magnetic induction heating component of the thermal trip trigger heats through an induced magnetic field generated by the current of the wiring board 11, and then transfers the heat to the bimetallic strip 34, so that the bimetallic strip 34 deforms and strikes the draw bar, and the tripping device is triggered to trip.

The electromagnetic trip trigger 20 and the thermal trip trigger 30 are both arranged on the wiring board 11, do not affect the current 11 transmission of the wiring board, can be well applied to a circuit breaker with large current (greater than 800A current), and have good precision and high reliability. The tripping device can trigger and trip in a thermomagnetic mode in the existing heavy current circuit breaker, and solves the difficulty that the tripping is ensured by controlling the temperature rise of a main loop and increasing the temperature of a bimetallic strip 34 in a thermal trip trigger in the heavy current circuit breaker. Compared with the structure that the electronic tripping device is adopted in the high-current circuit breaker in the prior art, the structure has the advantages of low cost, small size and higher market competitiveness.

Further, in the structure of the actual circuit breaker, the wiring board 11 is a strong current part, and is generally located at the lowermost layer, and the upper layer is a switching-on/off operation mechanism, so as to facilitate the operation of an operator, and enable the operator to be far away from the strong current part, and therefore, the tripping device is also generally located above the wiring board 11. Therefore, in this embodiment, the opening of the magnetic yoke 21 is disposed downward, the armature 22 is located below the opening of the magnetic yoke 21, and when the magnetic yoke 21 attracts the armature 22, the armature 22 translates upward to drive the ejector rod 24 to jack up and strike the traction rod of the trip device. Meanwhile, the attraction resistance of the magnetic yoke 21 and the armature 22 also comprises the gravity of the armature 22, and the arrangement can properly reduce the requirement on the damping part 23 and is easier to realize. Of course, in other embodiments, the orientation of the opening of the yoke 21 and the position of the armature 22 may be set according to an actual layout, for example, when the opening of the yoke 21 is set to be upward, the armature 22 is located above the opening of the yoke 21, and the yoke 21 pulls the armature 22 to translate downward; in this case, the resistance of the damper 23 also supports the weight of the armature 22, and the requirement for the damper 23 is high.

Still further, in this embodiment, the push rod 24 is vertically disposed, and a traction rod of the trip device directly faces an upper end portion of the push rod 24. The upward translation of the armature 22 drives the upward moving direction of the ejector rod 24 to be the same as the axial direction of the ejector rod, so that the space can be effectively saved. Of course, in other embodiments, the jack 24 may be provided to be inclined depending on the position of the drawbar, and the like, as long as the jack 24 can hit the drawbar.

Still further, in this embodiment, the yoke 21 is provided with a yielding hole (not shown) corresponding to the plunger 24, the plunger 24 is inserted into the yielding hole of the yoke 21, the upper end of the plunger 24 is exposed out of the upper surface of the yoke 21, and the draw bar of the trip device is located above the upper surface of the yoke 21. Therefore, the ejector rod 24 can be fixed at the middle position of the armature 22, the assembly volume is saved, and the striking effect on the traction rod is good. Of course, in other embodiments, the plunger 24 may be disposed on the periphery of the yoke 21, or the like.

Still further, in this embodiment, an abutting portion 25 having an outer diameter larger than the aperture of the avoiding hole of the magnetic yoke 21 is further fixed at the upper end of the ejector rod 24, the armature 22 is suspended, and the armature 22 and the ejector rod 24 abut against the upper surface of the magnetic yoke 21 through the abutting portion 25 to achieve positioning. Need not to adopt other bearing structure to support armature, very big spare part of saving, simple structure, design benefit. Of course, in other embodiments, other support structures may be used to support the armature.

Still further, in this embodiment, the abutting portion 25 is a nut, and the nut 25 is screwed to the upper end portion of the ejector rod 24, so that the nut 25 can move and adjust along the axial direction of the ejector rod 24, and further adjust an initial gap between the magnetic yoke 21 and the armature 22, and further adjust the impact displacement of the ejector rod 24. Of course, in other embodiments, the interference portion may also adopt other structures that can move and adjust along the axial direction of the push rod 24, or a structure that is directly fixed with the push rod 24, and the like.

Still further, in the present embodiment, the damping member 23 is an elastic damping member, and the elastic damping member 23 applies an elastic resistance to the armature 22 to prevent the armature from moving toward the yoke 21. When the magnetic yoke 21 and the armature 22 are attracted, the armature 22 moves upwards and translates against the elastic resistance of the elastic damping piece 23, and when the magnetic field force is reduced or disappears, the elastic damping piece 23 recovers elastic deformation to drive the armature 22 to reset in a punching mode, so that repeatability is realized. Of course, in other embodiments, the damping member 23 may be a non-elastic resistance, such as a frictional resistance generated by the armature 22 contacting an external structure.

Still further, in this embodiment, the elastic damping member 23 is a spring, the spring 23 is sleeved on the top rod 24, and two ends of the spring respectively abut against the magnetic yoke 21 and the armature 22. The spring 23 is adopted, and can be directly sleeved on the ejector rod 24, so that the assembly is easy, and the structure is stable after the assembly. Of course, in other embodiments, other resilient members may be used.

Further, in the present embodiment, 8 times of Ir in the electromagnetic trip trigger 20 is generally required to be inoperable, and 10 times of Ir is required to be reliably operable, which is relatively easy to implement for a low-current circuit breaker. However, for high current circuit breakers: if the normal current is 1250A, the effective value of the 8 times current is 10000A, and the effective value of the 10 times current is 12500A, which leads to that the magnetic conduction of the magnetic yoke 21 and the armature 22 is in a saturated state early, even if the current is increased to 10 times from 8 times, the magnetic flux change difference of the magnetic yoke 21 and the armature 22 is very small, i.e. the difference between the action value and the immobility value is very small, the arrangement of the spring 23 alone is difficult to be accurate and reliable, and the reliability of the electromagnet is not high. Therefore, in the structural design, the air gap and the magnetic conduction area of the magnetic yoke 21 and the armature 22 can be optimally designed in a matching way by fully considering the problem, the difference value between the action value and the fixed value is increased, and the action reliability of the electromagnet is ensured.

Further, in the present embodiment, the bimetal 34 extends between the upper surface of the yoke 21 and the drawbar. When the bimetal 34 reaches a certain temperature, the bimetal 34 deforms and tilts upwards to hit the traction rod.

More specifically, in this embodiment, the magnetic induction heating assembly includes: the magnetic focusing body 31 is of a U-shaped structure and is sleeved on the outer peripheral side of the wiring board 11, the magnetic resistance sheet 32 is fixedly connected to an opening of the magnetic focusing body 31 to form an annular magnetic conduction structure, the thermal element 33 is of an annular structure and is sleeved on the outer peripheral side of the magnetic resistance sheet 32, and the bimetallic strip 34 is connected with the thermal element 33. An induced magnetic field is generated at the periphery of the energized wiring board 11, and magnetic lines of force in the magnetic field are concentrated on an annular magnetic conduction structure consisting of the magnet gathering body 31 and the magnetic resistance sheet 32 to form a closed magnetic conduction loop which is equivalent to a coil of a transformer. Meanwhile, the thermal element 33 forms a closed loop around the magnetoresistive sheet 32, which is equivalent to a secondary winding of a transformer, and since the thermal element 33 does not output power to the outside, the induced electromotive force generated by the thermal element 33 is used for generating heat, that is, magnetic energy is converted into heat energy, so that the thermal element 33 generates heat, and the heat generated by the thermal element 33 is transferred to the bimetal 34 to deform the bimetal.

More specifically, in this embodiment, the plurality of magnetoresistive sheets 32 are sequentially stacked, which is equivalent to a plurality of magnetic resistances connected in series, and an alternating current phenomenon causes eddy currents (iron loss) to be generated on the magnetoresistive sheets, so that the temperature of the magnetoresistive sheets 32 is increased, heat can be transferred to the thermal element 33, the temperature of the thermal element 33 is increased faster, and the trigger response is faster.

Specifically, the bimetal 34 is a device used for triggering a trip action by heating deformation in the prior art, the end of the bimetal 34 corresponding to the traction rod is provided with a screw 35, and when the bimetal 34 deforms, the screw 35 strikes the traction rod, so that the structure is conventional and will not be described in detail herein.

More specifically, in the present embodiment, the thermal element 33 is made of pure copper, and has good thermal conductivity, so as to effectively transfer the temperature on the magnetoresistive sheet 32 and the thermal element 33 to the bimetal sheet 34. When the bimetallic strip 34 deforms, the screw 35 on the bimetallic strip 34 moves along with the bimetallic strip, the draw bar is pushed to act, and the circuit breaker can be tripped.

More specifically, in the present embodiment, the thermal element 33 and the magnetic resistance sheet 32 are fixedly connected through a connection post 37 fixedly penetrating between the two, so that the structure is simple. Of course, in other embodiments, the thermal element 33 and the magnetoresistive sheet 32 may be fixed by other methods.

The structure of the thermal trip trigger controls the heating on the magnetic resistance sheet and the thermal element, basically does not increase the heating of normal circuit devices such as a wiring board, a soft connection and the like, effectively controls the integral temperature rise of the circuit breaker, improves the capacity of a product, reduces the cost of the product and improves the competitiveness of the product.

As shown in fig. 6 to 8, the present embodiment further provides a vacuum circuit breaker, which includes an electromagnet 50, a link assembly, a vacuum interrupter 40, a trip device, and the above-mentioned fault current trigger device, wherein the electromagnet 50 is parallel to the vacuum interrupter 40 and is in transmission connection with the link assembly, the trip device includes a trip mechanism 71 and a drawbar 72, the trip mechanism 71 is connected in series to the link assembly, the fault current trigger device is located between the electromagnet 50 and the vacuum interrupter 40 and is disposed on a terminal board 11 connected to a movable end of the vacuum interrupter 40, the terminal board 11 in fig. 8 is the terminal board 11 in fig. 2 to 5, a gap between the electromagnet 50 and the vacuum interrupter 40 can be fully utilized, and the structure is more compact.

The draw bar 72 is arranged between the fault current trigger device and the trigger end of the tripping mechanism 71, and when the fault current trigger device acts to strike the draw bar 72, the draw bar 72 acts to act on the trigger end of the tripping mechanism 71, so as to trigger the tripping mechanism 71 to trip. Specifically, the tripping mechanism 71 and the traction rod 72 of the tripping device are both in the prior art, and the specific structure thereof is not described in detail herein.

More specifically, link assembly includes rotating bracket 61 and push rod 62, rotating bracket 61 can rotate around a fulcrum, the one end of rotating bracket 61 is connected through push rod 62 to electro-magnet 50, the end that moves of vacuum interrupter 40 is connected to the other end of rotating bracket 61, electro-magnet 50 promotes push rod 62, and then the drive rotates bracket 61 and rotates, the end that moves of rotation drive vacuum interrupter 40 of rotating bracket 61 moves and closes the floodgate.

The movable end and the static end of the vacuum arc-extinguishing chamber 40 are respectively connected with a wiring board, namely, the wiring board with the movable end connected with one is the wiring board 11 for arranging the fault current trigger device; the dead end is connected to patch panel 111. The extending directions of the two terminal plates 11, 111 are parallel to the axial direction of the push rod 62, so that the body structure of the vacuum circuit breaker and the whole structure of the vacuum circuit breaker after the vacuum circuit breaker is connected with an external device (such as an isolating contact) are more compact.

More specifically, the tripping mechanism 71 is serially connected to the push rod 62, that is, the push rod 62 is divided into two sections of struts, and the tripping mechanism 71 is serially connected between the two sections of struts, so that the tripping mechanism 71 can be conveniently arranged and a tripping action can be conveniently performed. Of course, in other embodiments, the setting position of the trip mechanism 71 is not limited to this.

More specifically, with continued reference to fig. 8 to 11, the push rod 62 is divided into two sections of struts, which are a first section of strut 201 and a second section of strut 204, the trip mechanism 71 includes a first connecting rod 202, a second connecting rod 203 and a mounting plate, the first section of strut 201, the first connecting rod 202, the second connecting rod 203 and the second section of strut 204 are sequentially hinged, the second section of strut 204 is fixedly connected to the mounting plate and is opposite to the electromagnet 50, a stop rod 206 and a trip half shaft 205 are assembled on the mounting plate, the stop rod 206 is configured with a stop rod reset torsion spring, and the trip half shaft 205 is configured with a trip half shaft reset torsion spring.

In a normal operating state of the circuit breaker, as shown in fig. 9 and 10, the stop lever 206 is pressed against the second link 203 by the stop lever return torsion spring, so that the first link 202 and the second link 203 are in a relatively straight state, and the trip half shaft 205 is pressed against the stop lever 206 by the trip half shaft return torsion spring, thereby locking the stop lever 206. At this time, the trip mechanism 71 is in a locked state, and the electromagnet 50 can push the second section of the supporting rod 204 to move the push rod 62 as a whole, so as to push the rotating bracket 61 to rotate, thereby contacting and closing the moving end and the static end of the vacuum interrupter 40. When the circuit breaker is normally de-energized, the trip mechanism 71 remains in a latched state.

When the breaker has a short circuit or overload fault, the current trigger device strikes the traction rod 72, the traction rod 72 pulls the tripping half shaft 205, so that the limitation on the stop rod 206 is removed, the return spring automatically shortens to pull the rotating bracket towards the electromagnet 50, the rotating bracket 61 rotates around a fulcrum under the action of the return spring, the first section of the supporting rod 201 is pushed against the first connecting rod 202 by the thrust of the upper end of the rotating bracket 61, the second connecting rod 203 overcomes the pressing force of the stop rod 206 on the second connecting rod to rotate, so that the first connecting rod 202 and the second connecting rod 203 are switched from a relatively straight state to a folded state shown in fig. 11 and 12, the tripping mechanism 71 enters a tripping state, and meanwhile, the lower end of the rotating bracket pulls the movable end of the vacuum arc extinguish chamber 40 to separate the movable end from the static end, so that the.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (12)

1. A fault current trigger device is used for triggering a tripping device to trip and comprises an electromagnetic tripping trigger and a thermal tripping trigger, and is characterized in that: the electromagnetic trip trigger includes: the magnetic yoke is sleeved on the outer periphery of the wiring board and provided with an opening, the armature is over against the opening of the magnetic yoke and is parallel to the opening of the magnetic yoke with a certain gap, the damping piece applies resistance to the armature to prevent the armature from moving towards the direction of the magnetic yoke, and the ejector rod is fixedly connected with the armature and corresponds to a traction rod of the tripping device; the thermal trip trigger comprises a magnetic induction heating assembly arranged on the wiring board and a bimetallic strip connected with the magnetic induction heating assembly, and the bimetallic strip corresponds to the traction rod of the trip device.

2. The fault current trigger device according to claim 1, wherein: the opening of yoke sets up down, armature is located the open-ended below position of yoke.

3. The fault current trigger device according to claim 2, wherein: the ejector rod is vertically arranged, and a traction rod of the tripping device is over against the upper end part of the ejector rod.

4. The fault current trigger device according to claim 3, wherein: the magnetic yoke is provided with a yielding hole corresponding to the ejector rod, the ejector rod penetrates through the yielding hole of the magnetic yoke, the upper end part of the ejector rod is exposed out of the upper surface of the magnetic yoke, and the traction rod of the tripping device is located above the upper surface of the magnetic yoke.

5. The fault current trigger device according to claim 4, wherein: the upper end of ejector pin still is fixed with the conflict portion in the aperture that the external diameter is greater than the hole of stepping down of yoke, conflict portion is the nut, the unsettled setting of armature, nut spiro union in the upper end of ejector pin, armature and ejector pin are contradicted in the upper surface of yoke and are realized fixing a position through the nut.

6. The fault current trigger device according to claim 1, wherein: the damping member is an elastic damping member which applies an elastic resistance to the armature to prevent the armature from moving in the direction of the yoke.

7. The fault current trigger device according to claim 6, wherein: the elastic damping piece is a spring, the spring is sleeved on the ejector rod, and two ends of the spring are respectively abutted to the magnetic yoke and the armature.

8. The fault current trigger device according to claim 4, wherein: the bimetal extends between the upper surface of the yoke and the drawbar.

9. The fault current triggering device according to claim 1 or 8, characterized in that: the magnetic induction heating assembly comprises: the magnetic collector comprises a magnetic collector body, a magnetic resistance sheet and a thermal element, wherein the magnetic collector body is of a U-shaped structure and is sleeved on the peripheral side of a wiring board, the magnetic resistance sheet is fixedly connected to an opening of the magnetic collector body to form an annular magnetic conduction structure, the thermal element is of an annular structure and is sleeved on the peripheral side of the magnetic resistance sheet, and the bimetallic sheet is connected with the thermal element.

10. A vacuum interrupter, characterized by: including electro-magnet, link assembly, vacuum interrupter, trip gear and claim 1 to 9 fault current trigger device, the electro-magnet is parallel with vacuum interrupter to form the transmission through link assembly and be connected, trip device includes trip mechanism and traction lever, trip mechanism concatenates on link assembly, fault current trigger device is located between electro-magnet and the vacuum interrupter to set up on the wiring board of connecting the vacuum interrupter's the end that moves, the traction lever sets up between fault current trigger device and the trigger end of trip mechanism.

11. The vacuum interrupter of claim 10, wherein: the connecting rod assembly comprises a rotating support and a push rod, the rotating support can rotate around a fulcrum, the electromagnet is connected with one end of the rotating support through the push rod, the other end of the rotating support is connected with a moving end of the vacuum arc extinguish chamber, the moving end and a static end of the vacuum arc extinguish chamber are respectively connected with a wiring board, and the extending directions of the two wiring boards are parallel to the axial direction of the push rod.

12. The vacuum interrupter of claim 11, wherein: the tripping mechanism is connected in series with the push rod.

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