CN111834164A - Circuit breaker - Google Patents

Abstract

The invention relates to a circuit breaker, in particular to an improvement of a tripping mechanism of the circuit breaker, which utilizes Homh force and Lorentz force generated by short-circuit current to quickly repel a moving contact, utilizes the repelled motion of the moving contact when the moving contact is repelled, designs tripping composite structure transmission to directly trip a tripping half shaft and a tripping sheet, shortens the response time of the mechanism, improves the capacity of cutting off fault current, reduces the impact of the fault current on a system, and avoids the contact from being closed with a static contact again after being repelled by using a mode of directly tripping by connecting rod transmission, thereby preventing electric arc from reigniting, reducing the burning loss of the contact and reducing the difficulty of electric arc extinguishing.

Description

Circuit breaker

Technical Field

The invention relates to a circuit breaker, in particular to improvement of a tripping mechanism of the circuit breaker.

Background

The circuit breaker is a switching device widely applied to a power distribution system, when a circuit has faults such as overload, short circuit, undervoltage and the like, the circuit breaker needs to be capable of quickly cutting off the circuit so as to prevent components from being burnt under overlarge current, so that the circuit breaker is generally provided with a quick tripping mechanism to quickly break the circuit, and the speed of tripping and tripping directly influences the capacity of the circuit breaker for cutting off fault current. A thermomagnetic release is a release mechanism commonly used in the field of current circuit breakers, but when a short-circuit current occurs in a circuit, a magnetic yoke of the thermomagnetic release needs to be magnetized for a certain time to generate magnetic force, then an armature is attracted to act, and finally a switch cuts off the fault current by striking the lock mechanism to release, so that 2-level mechanical transmission is needed, and the armature of the thermomagnetic release is far away from the magnetic yoke in the conventional technology (an air gap between the armature and the magnetic yoke is large), so that the initial attraction of the armature by the magnetic yoke is small, the action of the armature is not rapid enough, and the action response speed of the thermomagnetic release is slow, so that the fault current has long time and the system safety is affected. In addition, the thermomagnetic release usually has more parts and more complex structures.

Disclosure of Invention

Therefore, the invention provides a structurally optimized circuit breaker in view of the above problems.

The invention is realized by adopting the following technical scheme:

the invention provides a circuit breaker, which comprises a locking mechanism and a contact system, wherein the contact system comprises a moving contact which is rotationally connected, the circuit breaker also comprises a link mechanism, the moving contact comprises a moving contact which is positioned at one end of a rotating point and a matching surface at the other end, the moving contact, the link mechanism and the locking mechanism form a tripping combination, the locking mechanism is provided with a triggering part, when the moving contact is stressed to rotationally move, the link mechanism can be driven to move through the matching surface, and the link mechanism moves to trigger the triggering part of the locking mechanism, so that the locking mechanism moves from a locking position to a releasing position.

In order to improve the tripping efficiency, in one embodiment, the latching mechanism at least comprises a tripping half shaft and a tripping piece capable of being in lap joint with the tripping half shaft, the tripping half shaft is provided with the triggering part, the link mechanism is rotatably arranged, and when the movable contact moves in a rotating manner, the link mechanism is used for converting the movement track of the mating surface into a driving force capable of shifting the triggering part on the tripping half shaft, so that the tripping half shaft rotates, and the latching mechanism moves to the tripping position.

Wherein, in order to utilize the repulsion force of the moving contact to realize rapid tripping, based on the consideration of compactness and reliability of the structure, in one embodiment, the link mechanism comprises a first link and a second link, the first link comprises a first matching part and a second matching part, the second link has a third matching part and a driving part, the first link is arranged close to the matching surface with the first matching part, the second matching part of the first link is matched with the third matching part of the second link, the driving part is matched with the triggering part, when the moving contact rotates, the matching surface of the moving contact can be converted into the pushing force to the first link through the matching with the first matching part, so that the first link rotates towards the direction of the second link, and when the first link rotates towards the second link, the driving part can be converted into steering force to the second connecting rod through the matching of the second matching part and the third matching part, so that the driving part has driving force capable of shifting the triggering part.

In order to avoid mutual interference under the dynamic motion of the circuit breaker, in one embodiment, the first connecting rod and the movable contact are both rotatably connected and arranged on the same movable component (i.e., the rotating disc in the embodiment).

In order to improve the stability of the force application and the force bearing of the first connecting rod, in one embodiment, the first connecting rod is a block-shaped structure which is approximately in a shape of'd', and comprises a second protrusion forming a main body in a shape of'd', a first protrusion protruding towards the matching surface, and a tail end far away from the second protrusion and the matching surface, the tail end is rotatably pivoted, the first protrusion serves as the first matching portion, and the second protrusion serves as the second matching portion.

In order to improve the mechanical property, increase the service life of the parts, and improve the stability of the forced movement, in one embodiment, the second link is a block structure approximately in a shape of "c", and includes a base portion pivotally arranged in a rotating manner, a first protruding portion protruding to the outside of the base portion as a third engaging portion, and a driving portion extending to the outside of the base portion, the first protruding portion is in interference fit with the second engaging portion of the first link, the driving portion is in a hook-shaped structure, and the end of the driving portion is used as a force application point for shifting the driving force of the trigger portion.

In order to improve the tripping efficiency, the gas outlet of the arc extinguishing chamber is utilized, and in one embodiment, the arc extinguishing system is further included, the second connecting rod further comprises a second protruding part protruding towards the outer side of the base body part, and the second protruding part is of a flat plate-shaped structure with a plane facing the direction of the arc extinguishing system.

In one embodiment, the trip half shaft has a substantially columnar base portion, a first groove is formed on an excircle of the base portion in a tangential direction of the base portion, one end of the first groove has a step structure connected with the groove, the trip half shaft and the trip tab are rotatably disposed, one end of the trip tab can be lapped on the step structure, and when the trip half shaft rotates, one end of the trip tab can be separated from the step structure and fall into the first groove, the trip tab is of a sheet structure, one end of the trip tab has a hook-shaped lapping portion, and the lapping portion of the trip tab is lapped on the step structure.

In one embodiment, the tripping half shaft further includes a collar, the collar is disposed on the base body, the collar has a second groove formed on an outer circumference thereof along a tangential direction thereof, and the second groove and an outer circumferential surface of the base body form the stepped structure when the collar is disposed on the base body.

In order to give way to the jump buckle piece, in one embodiment, the triggering portion is a flat-plate-shaped shifting piece structure and has a notch with a width approximately equal to that of the first groove, and the notch and the first groove together form a giving-way space for the jump buckle piece to fall.

In order to reset the latching mechanism and limit a reasonable rotational position of the latching mechanism, in one embodiment, the latching mechanism further includes a limiting mechanism and a resetting member, the limiting mechanism is used for limiting a rotational angle range of the tripping half shaft, and the resetting member is used for applying a resetting force to the tripping half shaft, wherein the resetting force is generated by moving from a tripping position to a latching position.

In one embodiment, the circuit breaker has a circuit breaker casing with an annular sector groove, the tripping half shaft has an extension part which is not coaxial and extends along the axial direction of the tripping half shaft and is approximately in an L-shaped structure, the tripping half shaft is rotatably assembled on the circuit breaker casing, and when the tripping half shaft is assembled on the circuit breaker casing, the first extension part is inserted into the annular sector groove, so that the limiting mechanism is realized.

Wherein, based on cost and installation considerations, in one embodiment, the reset member is a torsion spring, one of the arms of which abuts against the extension.

In order to ensure the multiple tripping function, in an embodiment, based on the improved design of the above structure, in addition to a space for forming a second tripping assembly of a second tripping manner, the circuit breaker further includes a thermomagnetic trip, the second tripping assembly includes the thermomagnetic trip and the latch mechanism, and the latch mechanism further includes a second triggering portion, and the thermomagnetic trip is configured to trigger the magnetically excited and/or thermally deformed trip to generate a driving force for the second triggering portion, so as to trigger the second triggering portion of the latch mechanism, and move the latch mechanism from the latching position to the tripping position.

The invention has the following beneficial effects: the invention utilizes the Homh force and the Lorentz force generated by the short-circuit current to quickly repel the contacts, directly releases the tripping half shaft and the tripping sheet through tripping combination transmission, shortens the response time of the mechanism, improves the capacity of cutting off the fault current, reduces the impact of the fault current on a system, and avoids the contacts from being closed again with the static contacts after repelling, prevents the electric arc from reigniting, reduces the burning loss of the contacts and reduces the extinguishing difficulty of the electric arc through the mode of directly releasing by connecting rod transmission.

Drawings

Figure 1 is a perspective view (angle one) of the circuit breaker of the embodiment;

fig. 2 is a perspective view (angle two) of the circuit breaker in the embodiment;

fig. 3 is an exploded view (angle one) of the structure of the circuit breaker in the embodiment;

fig. 4 is an exploded view (angle two) of the structure of the circuit breaker in the embodiment;

fig. 5 is a schematic diagram of the internal structure of the circuit breaker in the embodiment;

figure 6 is a schematic illustration of a circuit breaker housing according to an embodiment;

FIG. 7 is a schematic layout of the moving and fixed terminals and contact system of the circuit breaker in the embodiment;

figure 8 is an exploded view of the contact system of the embodiment;

FIG. 9 is a schematic diagram of the movable contact and the movable terminal connected by a flexible wire in the embodiment;

figure 10 is a perspective view of the circuit breaker movable and stationary terminals and contact system of the embodiment;

FIG. 11 is a perspective view of the turntable in the embodiment;

FIG. 12 is a schematic view showing the assembly of the turntable and the base in the embodiment;

FIG. 13 is a schematic diagram of conduction between a fixed terminal and a movable terminal in the embodiment;

FIG. 14 is a schematic view showing the stationary and movable terminals disconnected in the embodiment;

FIG. 15 is a perspective view of an embodiment of a snap tab;

fig. 16 is a schematic view of the assembly of the trip half shaft and second link with the circuit breaker housing in an embodiment;

fig. 17 is a perspective view (one of) the trip half shafts of the embodiment;

fig. 18 is a perspective view of the trip half shaft of the embodiment (a second thereof);

FIG. 19 is a perspective view of a second link in the embodiment;

fig. 20 is a schematic diagram of the operating principle of the trip combination in the embodiment (when the loop is on);

fig. 21 is a schematic diagram of the working principle of the trip combination in the embodiment (when the movable contact is repelled);

fig. 22 is a schematic view of the operating principle of the trip assembly in the embodiment (when the trip plate is tripped);

FIG. 23 is a schematic diagram illustrating the force applied to the first link pushed by the passive contact in the embodiment;

FIG. 24 is a schematic illustration of the operation of the thermomagnetic release of an embodiment.

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. 1 to 5, as a preferred embodiment of the present invention, there is provided a circuit breaker including a housing, an operating mechanism 2 mounted on the housing, a contact system 3, a latch mechanism 4, a trip unit 5, and an arc extinguishing system 6. In the illustration of fig. 5, the contact system 3 is approximately in the middle position, the trip 5 and the operating mechanism 2 are disposed on the upper left and upper right sides of the contact system 3, and the arc extinguishing system 6 is disposed below the contact system 3.

Referring to fig. 1, 2 and 6, the circuit breaker housing includes a base 1 and a substrate 8, the base 1 includes a first base 1 ' and a second base 1 ' which are jointed, the base 1 is jointed by the first base 1 ' and the second base 1 "to form a substantially closed internal space which can accommodate the contact system 3, the release 5 and the arc extinguishing system 6, so as to avoid the escape of free gas generated by internal electric arc and influence on personal safety; the base plate 8 comprises a first base plate 8 'and a second base plate 8' which are oppositely arranged, the first base plate 8 'and the second base plate 8' are respectively fixed on the first base 1 'and the second base 1', and an installation space for installing the operating mechanism 2 and the locking mechanism 4 is formed between the first base plate 8 'and the second base plate 8'. The base 1 and the base plate 8 form the mounting base for the operating mechanism 2, the contact system 3, the latching mechanism 4, the trip unit 5 and the arc extinguishing system 6 in the present exemplary embodiment.

Referring to fig. 7, the circuit breaker has a fixed terminal 10 and a movable terminal 11 separately disposed at both sides as an electrical connection terminal, and the fixed terminal 10 and the movable terminal 11 are controlled to be connected and disconnected by a contact system 3; the contact system 3 is disconnected by rotation, and in particular, referring to fig. 8 and 10, the contact system 3 includes a movable contact 31 having a substantially "J" shape, and a hollow circular turntable 32, the turntable 32 is rotatably connected to the base 1, and the movable contact 31 is rotatably connected to the turntable 32. Specifically, referring to fig. 11 and 12, in the present embodiment, the turntable 32 has a circular protruding column 321 at a central position thereof, the circular protruding column 321 can be fittingly connected to a circular mounting hole 1 ' 1 on the first base 1 ' (the size of the mounting hole 1 ' 1 matches the size of the protruding column 321, and is in clearance fit), so as to realize rotatable connection between the turntable 32 and the first base 1 ', and easily associate, the turntable 32 can be provided with two circular protruding columns 321 to be fittingly connected with the first base 1 ' and the second base 1 ″ on two sides of the turntable 32, respectively, so as to increase stability of connection and movement of the turntable 32. In addition, referring to fig. 8, 9 and 11, the movable terminal 11 is electrically connected (welded) to the movable contact 31 through the flexible conductive wire 12, the movable contact 31 has a through hole 311, and the movable contact 31 is connected to the mounting hole 322 of the turntable 32 through the through hole 311 by a pin, so that the movable contact 31 is rotatably connected to the turntable 32.

Referring to fig. 13 and 14, two cases of conduction (in fig. 13, a feasible current flow direction is indicated to facilitate understanding) and disconnection (fig. 14) between the stationary terminal 10 and the moving terminal 11 are shown, in which the stationary terminal 10 has a stationary contact, the stationary contact includes a stationary contact 101, in which the moving contact 31 has a moving contact 312, the turntable 32 can be driven by the operating mechanism 2 or driven to rotate by the tripping motion of the latch mechanism 4, so as to drive the moving contact 31 to relatively approach or be away from the stationary terminal 10, when the moving contact 31 approaches the stationary terminal 10, the moving contact 312 abuts against the stationary contact 101, so that the stationary terminal 10 and the moving terminal 11 are conducted, and when the moving contact 31 leaves the stationary terminal 10, the stationary terminal 10 and the moving terminal 11 are disconnected, and in the state of the contact system 3 in fig. 13 and 14, that is, the circuit breaker is in the state of the contact system 3 under the closing state and the opening state.

For convenience of description, the position and orientation are defined as follows:

defining the position of the movable terminal 11 relative to the fixed terminal 10 as the left side and the position of the fixed terminal 10 relative to the movable terminal 11 as the right side in the diagram picture of fig. 7;

defining the position of the first base 1 'relative to the second base 1 "as front and the position of the second base 1" relative to the first base 1' as rear in the picture of fig. 6;

it is defined that the movable terminal 11 and the fixed terminal 10 in the illustration screen of fig. 7 are located relatively above the arc extinguishing system 6, and the arc extinguishing system 6 is located relatively below the movable terminal 11 and the fixed terminal 10.

When a circuit is in serious overload or short circuit, undervoltage and other faults, the circuit breaker needs to be capable of quickly cutting off the circuit so as to prevent elements from being burnt under overlarge current, so that the circuit breaker is generally provided with a quick tripping mechanism to quickly break the circuit, and the speed of tripping and tripping directly influences the capacity of the circuit breaker for cutting off fault current. In contrast, when the circuit breaker in this embodiment performs electrical protection, there are two tripping modes, namely, a thermomagnetic tripping mode and a repulsive force tripping mode, according to the magnitude of the overcurrent current, where the thermomagnetic tripping mode is implemented by the tripper 5 and the latch mechanism 4, and when a smaller ampere current (e.g., 2.5kA in a specific typical application) is overcurrent, the thermomagnetic tripping mode acts, and when a larger ampere current (e.g., 10kA in a specific typical application) is overcurrent, the repulsive force acts mainly, so that the tripping speed of the repulsive force tripping is faster, and the breaking capability is stronger. The repulsion tripping mode is mainly realized by a tripping combination consisting of a movable contact 31, a locking mechanism 4 and a tripping link mechanism, wherein the locking mechanism 4 comprises a tripping half shaft 41 and a tripping sheet 25 capable of being lapped on the tripping half shaft 41, both the tripping half shaft 41 and the tripping sheet 25 can be rotatably connected on a breaker shell, referring to fig. 15, the tripping sheet 25 is a structure which is approximately in a Y shape and is formed by joining two mirror-symmetrical unit sheets 250, and comprises two connecting parts 251 which are parallel at intervals, a binding part 252 which is formed by extending one end of the connecting part 251 and gradually approaches to each other, and a lapping part 253 which is jointed at the tail end of the binding part 252, the connecting part 251 is provided with a through hole 255 to be rotatably connected on the breaker shell, the lapping part 253 is bent in an arc shape, and the lapping part 253 is used for lapping on the tripping half shaft 41 to realize quick tripping of the operating. Referring also to fig. 17-18, the trip half shaft 41 includes a generally cylindrical base portion 413 having first and second posts 417, 414 at front and rear ends of the base portion 413 for rotatably coupling with the base plate 8, the base portion 413 having a sector plate 415 extending generally radially outwardly therefrom, the sector plate 415 having a third post 4152 at a free end thereof extending axially rearwardly of the base portion 413, the sector plate 415 and the third post 4152 forming extensions of a generally "L" configuration that are not coaxial with the base portion 413 and extend axially of the trip half shaft 41. The sector plate 415 also has a raised stop 4151 thereon. A collar 416 is fixed on the base 413 in a sleeved manner, the collar 416 and the base 413 have a groove at the same side of the base 413 along the tangential direction of the base 413, the groove on the collar 416 has a greater opening depth at least at one end near the upper end than the groove on the base 413 at least at one end near the upper end, so that when the collar 416 is sleeved on the base 413, the collar 416 and the base 413 form a step 411 and a groove 412 which are connected together at the groove, the groove 412 is a through groove which is approximately penetrated from top to bottom, the overlapping portion 253 of the jumper 25 can overlap the step 411, and when the tripping half shaft 41 rotates counterclockwise, the overlapping portion 253 of the jumper 25 can be separated from the overlapping of the step 411 and fall from the groove 412. The collar 416 has a first paddle 4161 and a second paddle 4162 extending outward substantially along the radial direction thereof, the free end of the second paddle 4162 is in a shape of a "J" hook, and since the groove 412 needs to be formed, the second paddle 4162 has a notch corresponding to the width of the groove 412 at a position corresponding to the groove 412, the notch and the groove 412 form a space for the lap portion 253 of the jumper 25 to fall, and the sector plate 415, the first paddle 4161 and the second paddle 4162 are forked in a shape of a "Y" in the front-rear direction. In this embodiment, a collar 416 is fitted over the base portion 413 to form the step 411 and the groove 412 of the trip half shaft 41, which is more convenient for production and installation, and in other embodiments, the trip half shaft 41 may be integrally formed.

Referring to fig. 16, the second protrusion 414 of the trip half shaft 41 is rotatably coupled to the through hole 8"2 of the second base plate 8", and the third protrusion 4152 of the trip half shaft 41 simultaneously falls into the sector annular groove 8"3 of the second base plate 8", so that the sector annular groove 8"3 limits the rotation range of the trip half shaft 41, on one hand, the trip half shaft 41 is prevented from generating position deviation under the action of the torsion spring 14, and on the other hand, the rotation angle of the trip half shaft 41 can be limited, so as to design the assembling positions of the step 411, the groove 412 and the overlapping portion 253. A torsion spring 14 is arranged on the left side of the fan-shaped annular groove 8 '3, the torsion spring 14 is wound on a fixed seat 8' 4 protruding on the second base plate 8 ', a first arm 141 of the torsion spring 14 is blocked by a block 8' 5 to limit torsion, when the tripping half shaft 41 is assembled on the second base plate 8 ', a second arm 142 of the torsion spring 14 is abutted against a third convex column 4152 of the sector plate 415 of the tripping half shaft 41, and the torsion spring 14 is limited in the front-back direction by a limit table 4151 and the second base plate 8'. The reset force of the fan-shaped plate 415 towards the right side is always given, so that the tripping half shaft 41 always has the tendency of clockwise rotation, on one hand, the step 411 on the tripping half shaft 41 is abutted to the tripping piece 25 rightwards in the state that the tripping piece 25 is overlapped on the step 411 (namely, in the locking state), so as to form stable locking, and on the other hand, when the tripping piece 25 is manually opened and reset after being tripped, when the rising height of the tripping piece 25 is higher than the step 411, the tripping half shaft 41 is pushed to clockwise rotate so that the step 411 is overlapped on the tripping piece 25 again, so as to help the tripping half shaft 41 to reset. The embodiment forms a sector annular groove on the shell of the circuit breaker to be matched with the tripping half shaft to form a limiting mechanism, thereby facilitating the manufacturing and production and improving the compactness of the structure; in the embodiment, the torsion spring 14 is used as a reset piece of the tripping half shaft, so that the installation is convenient, the cost is low, and in other embodiments, structures such as column springs can be adopted as long as the structural functions can be met.

Referring to fig. 19, the trip link mechanism includes a substantially c-shaped second link 42, the second link 42 includes a cylindrical base portion 421 for rotatably connecting to the circuit breaker housing, a protruding portion 423 (as an engaging portion where the second link 42 is in interference fit with the first link 33) and a plate 424 are connected to an outer peripheral side of the base portion 421, and a substantially hook-shaped pushing portion 422 (as a driving portion where the second link 42 is in interference fit with the trip half shaft 41) is connected to an outer peripheral side of the base portion 421, when the second link 42 rotates, the pushing portion 422 may abut against the second paddle 4162 to transmit force to the trip half shaft 41 to rotate the trip half shaft 41, so that a relief groove is opened at a position where the pushing portion 422 and the second paddle 4162 are cut off to provide a drop relief for the trip piece 25. Moreover, the pushing part 422 is a hook-shaped structure, the end of the pushing part 422 extending in the horizontal direction serves as a force application point for shifting the driving force of the second shifting piece 4162, so as to improve the mechanical property of the pushing part 422 as the force application structure, the second shifting piece 4162 is also hook-shaped, and the end of the pushing part 422 can be abutted against the inner side of the hook structure of the second shifting piece 4162, so that the pushing fit between the two is tighter. Referring to fig. 16 again, the second connecting rod 42 is rotatably connected to the second base 1 ″, and in a closing state, the pushing portion 422 abuts against the second toggle piece 4162, so that a moving process between the two is shortened, and the linkage efficiency is improved.

The trip link mechanism further includes a first link 33, and referring again to fig. 8, the first link 33 is rotatably connected to the inside of the rotary plate 32 by a pin connection, and the first link 33 is a generally d-shaped projection structure having a projection projecting radially outward of the rotary plate 32. Referring to fig. 20-21, the lower end of the first connecting rod 33 (as the first engaging portion where the first connecting rod 33 is in interference fit with the movable contact 31) rotatably connected to the rotating disc 32 and the upper end of the movable contact 31 are disposed close to each other and respectively have certain sliding engaging surfaces, and the sliding engaging surfaces of the two are designed to satisfy the following force requirements: when the movable contact 31 rotates clockwise, the sliding mating surface at the upper end of the movable contact 31 can apply a force to the sliding mating surface at the lower end of the first connecting rod 33 to make the first connecting rod 33 rotate clockwise, so that the movable contact 31 can rotate clockwiseAnd the radial outer side of the first link 33 (as a second engagement portion where the first link 33 is in interference engagement with the second link 42) is made to protrude toward the outer periphery of the turntable 32. The lower end of the first connecting rod 33 is a lower convex structure with a smooth arc surface, the lower convex structure can reduce the stressed area of the first connecting rod 33 and intensively stress, on the one hand, the smooth arc surface design can make the movable contact 31 more stably apply force to the first connecting rod 33, on the other hand, the upper end of the movable contact 31 is an involute arc surface which is approximately outward from the contact C, so that the upper end of the movable contact 31 more stably applies force to the first connecting rod 33, and the involute arc surface design can enlarge the movable force application surface of the movable contact 31 and increase the reliability of the linkage of the movable contact 31 and the first connecting rod 33. Therefore, when the movable contact 31 rotates clockwise around the contact point C with the rotary plate 32, the upper end of the movable contact 31 abuts against the lower end of the first link 33, and the first link 33 rotates clockwise around the contact point D with the rotary plate 32 to expose the rotary plate 32, and the force F of the movable contact 31 against the first link 33 is visible as shown in fig. 23₄Is located at the left side of the rotation center point of the first link 33, so as to generate a moment to rotate the first link 33 clockwise, and the rotation center D of the first link 33 is disposed away from the end of the movable contact 31, so as to increase the moment arm of the rotating force when the first link 33 is pushed by the movable contact. The first connecting rod 33 and the movable contact 31 can be rotatably connected to the rotary disc 32, so that mutual interference can be avoided under the dynamic motion of the circuit breaker. It should be noted that, the design of the sliding mating surface of the lower end of the first connecting rod 33 and the upper end of the movable contact 31 is related to the moving position and the shape of the two, and in different implementation and application occasions, the corresponding design is required to meet the above-mentioned stress requirement.

Referring to fig. 20-22 in sequence, and in combination with the above structural features, the repulsion tripping principle in this embodiment is as follows: when the expected short-circuit current occurs in the circuit, the movable contact 31 is repelled by the action of the holm force and the lorentn magnetic force, the upper end of the movable contact 31 pushes the first link 33 to rotate clockwise, so that the first link 33 is exposed out of the turntable 32, during the rotation of the first link 33, the outer side of the protrusion of the first link 33 abuts against the protrusion 423 of the second link 42, so as to push the second link 42 to rotate clockwise, meanwhile, as the movable contact 31 is repelled away and is separated from the static contact, an electric arc is generated between the movable contact 31 and the static contact, the pressure in the arc extinguishing chamber is increased, the high-pressure gas generated by the arc extinguishing system 6 below moves upwards so as to push the flat plate 424 (therefore, preferably, the flat plate 424 is a flat plate structure with a plane facing the arc extinguishing system 6), so as to push the second link 42 to rotate clockwise, during the clockwise rotation of the second link 42, the abutting portion 422 thereof abuts against, finally, the tripping half shaft 41 is pushed to rotate anticlockwise, so that the tripping half shaft and the tripping are tripped, and the switch is tripped to cut off a fault circuit.

Then, when the trip plate 25 is tripped and then is manually opened to reset, as can be seen from the above-mentioned torsion spring 14, the torsion spring 14 will drive the trip half shaft 41 to rotate clockwise to reset, in this process, the second dial plate 4162 will abut against the pushing part 422 to push the second connecting rod 42 to rotate counterclockwise to reset, the first connecting rod 33 is provided with a torsion spring structure at its rotation point to reset the first connecting rod 33, and similarly, the second connecting rod 42 may also be provided with a reset torsion spring, but under the action mechanism of the second dial plate 4162, it is not necessary to provide a reset torsion spring for the second connecting rod 42.

In this embodiment, a more compact and efficient two-link mechanism composed of the first link 33 and the second link 42 is used to convert the motion trajectory of the sliding mating surface at the upper end of the moving contact 31 into a driving force capable of toggling the second toggle piece 4162 on the trip half shaft 41, so as to rotate the trip half shaft 41, and to realize the example of the movement of the latch mechanism to the trip position for display; however, in the application of other embodiments, other link mechanisms may be redesigned according to specific needs, and it is a feasible technical solution as long as the requirement of "converting the motion trajectory of the sliding mating surface of the movable contact into the driving force capable of tripping the trip half shaft" can be met.

In addition, it should be noted that in this embodiment, the simple and effective operating mechanism 2 is disposed on the right side of the rotary plate 32 to drive the rotary plate 32 to rotate, the first connecting rod 33 and the second connecting rod 42 (as a connecting rod mechanism) are disposed in the left space of the rotary plate 32 to trigger the latch mechanism 4 on the left upper side of the rotary plate 32 to release the repulsive force, the overall space of the circuit breaker is fully utilized, the overall size of the circuit breaker is reduced, and the reliability of the linkage between the mechanisms is also ensured.

In the repulsion tripping mode in the embodiment, the contacts are quickly repelled by using the holm force and the lorentn magnetic force generated by the short-circuit current, the tripping half shaft 41 and the tripping sheet 25 are directly tripped through the link transmission (by means of the motion matching of the first link 33, the second link 42 and the second plectrum 4162), the response time of the mechanism is shortened, the capacity of cutting off the fault current is improved, the impact of the fault current on the system is reduced, in addition, the contacts are prevented from being closed again with the static contacts after repelled through the link transmission direct tripping mode, the electric arc reignition is prevented, the contact burning loss is reduced, and the electric arc extinguishing difficulty is reduced.

As described above, in the present embodiment, a thermal-magnetic trip mode is further provided, and is implemented by the trip unit 5 and the latch mechanism 4, referring to fig. 24, the trip unit 5 is a thermal-magnetic trip unit, and when an over-short circuit occurs in the circuit, after a magnetic yoke on the trip unit 5 is magnetized, the magnetic armature 51 is attracted to act, so that the magnetic armature 51 hits on the first toggle piece 4161, thereby causing the trip half shaft 41 to rotate counterclockwise, and the trip unit 25 trips to trip the trip switch, thereby cutting off the fault circuit.

In addition, in the embodiment, the first dial 4161 and the second dial 4162 on the trip half shaft 41 are used as triggering portions for the rotation of the trip half shaft 41, and the triggering portions are triggered to dial the trip half shaft 41 to rotate (such as the striking of the trip unit 5 and the pushing action of the second link 42) to achieve the purpose of tripping. In other application occasions, the triggering portion may be adaptively designed according to actual conditions to serve as a receiving portion of a driving force finally formed in a repulsion tripping manner or a thermomagnetic tripping manner, and after receiving triggering, the triggering portion actuates the latching mechanism to complete tripping, which may be in other manners such as toggle rotation or moving unlocking in the present embodiment, and the movement design thereof is based on the repulsion tripping manner provided in the present embodiment, and combines with the existing tripping mechanisms of various latching mechanisms to generate a similar "repulsion-triggered tripping" scheme, which should be considered as a scheme without departing from the technical idea provided by the present invention.

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. The utility model provides a circuit breaker, includes latch mechanism, contact system, the contact system includes a moving contact of rotation connection, its characterized in that: the circuit breaker still includes link mechanism, the moving contact is including the fitting surface that is located the moving contact of swivel point one end and the other end, moving contact, link mechanism and latched device constitute the dropout combination, wherein: the locking mechanism is provided with a triggering part, when the moving contact is stressed to rotate, the connecting rod mechanism can be driven to move through the matching surface, and the connecting rod mechanism moves to trigger the triggering part of the locking mechanism, so that the locking mechanism moves from a locking position to an unlocking position.

2. The circuit breaker of claim 1, wherein: the locking mechanism at least comprises a tripping half shaft and a tripping sheet which can be in lap joint with the tripping half shaft, the triggering part is arranged on the tripping half shaft, the connecting rod mechanism is arranged in a rotatable mode, and when the movable contact moves in a rotating mode, the connecting rod mechanism is used for converting the motion trail of the matching surface into driving force capable of shifting the triggering part on the tripping half shaft, so that the tripping half shaft rotates, and the locking mechanism moves to a tripping position.

3. The circuit breaker of claim 2, wherein: the link mechanism comprises a first link and a second link, the first link comprises a first matching part and a second matching part, the second connecting rod is provided with a third matching part and a driving part, the first connecting rod is arranged close to the matching surface through the first matching part, the second matching part of the first connecting rod is matched with the third matching part of the second connecting rod, the driving part is matched with the triggering part, when the moving contact moves in a rotating way, the matching surface of the moving contact can be converted into pushing force of the first connecting rod through matching with the first matching part, thereby rotating the first link in a direction toward the second link, when the first link rotates toward the second link, the driving part can be converted into steering force to the second connecting rod through the matching of the second matching part and the third matching part, so that the driving part has driving force capable of shifting the triggering part.

4. The circuit breaker of claim 2, wherein: the first connecting rod and the moving contact are rotatably connected and arranged on the same movable component.

5. The circuit breaker of claim 3, wherein: the first connecting rod is of a block-shaped structure approximately in a shape of'd', and comprises a second bulge forming a main body in a shape of'd', a first bulge protruding towards the matching surface, and a tail end far away from the second bulge, the tail end is rotatably pivoted, the first bulge serves as the first matching part, and the second bulge serves as the second matching part.

6. The circuit breaker of claim 3, wherein: the second connecting rod is a block-shaped structure approximately in a shape of 'c', and comprises a base body part which is rotatably pivoted, a first protruding part which extends and protrudes towards the outer side of the base body part and serves as a third matching part, and a driving part which extends towards the outer side of the base body part, wherein the first protruding part is in interference fit with the second matching part of the first connecting rod, the driving part is in a hook-shaped structure, and the tail end of the driving part serves as a force application point for stirring the driving force of the trigger part.

7. The circuit breaker of claim 6, wherein: the second link further includes a second protrusion protruding outward from the base portion, and the second protrusion has a flat plate-like structure having a plane facing the arc extinguishing system.

8. The circuit breaker of claim 2, wherein: the tripping half shaft is provided with a roughly columnar base body, a first groove is formed in the excircle of the base body along the tangential direction of the base body, one end of the first groove is provided with a stepped structure connected with the groove, the tripping half shaft and the tripping sheet are both rotatably arranged, one end of the tripping sheet can be lapped on the stepped structure, when the tripping half shaft rotates, one end of the tripping sheet can be separated from the contact with the stepped structure and fall into the first groove, the tripping sheet is of a sheet structure, one end of the tripping sheet is provided with a lapping part in a bent hook shape, and the tripping sheet is lapped on the stepped structure through the lapping part.

9. The circuit breaker of claim 8, wherein: the tripping half shaft further comprises a shaft collar, the shaft collar is sleeved on the base body, a second groove is formed in the outer circumference of the shaft collar along the tangential direction of the shaft collar, and when the shaft collar is sleeved on the base body, the second groove and the outer circular surface of the base body form the stepped structure.

10. The circuit breaker of claim 8, wherein: the trigger part is of a flat-plate-shaped shifting piece structure and is provided with a notch with the width approximately equal to that of the first groove, and the notch and the first groove form a yielding space for the jump buckle piece to fall down together.

11. The circuit breaker of claim 2, wherein: the locking mechanism further comprises a limiting mechanism and a resetting piece, the limiting mechanism is used for limiting the rotation angle range of the tripping half shaft, and the resetting piece is used for applying resetting force to the tripping half shaft from the tripping position to the locking position.

12. The circuit breaker of claim 11, wherein: the circuit breaker has the circuit breaker casing, a fan-shaped annular groove has on the circuit breaker casing, have not coaxial and follow on the dropout semi-axis the axial extension of dropout semi-axis roughly is the extension of "L" style of calligraphy structure, the dropout semi-axis rotationally assembles on the circuit breaker casing, the assembly of dropout semi-axis is in when on the circuit breaker casing, first extension inserts in the fan-shaped annular groove to the realization stop gear.

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