CN213242447U - Small-sized circuit breaker - Google Patents

Abstract

A miniature circuit breaker comprises a shell and an operating mechanism arranged in the shell, wherein the operating mechanism comprises a support, a jump buckle and a lock catch, wherein the jump buckle and the lock catch are pivotally arranged on the support; the hasp resets and includes the portion of buckling, the both ends of the portion of buckling are regarded as first elastic arm respectively, the outside extension of second elastic arm, the distortion portion of torsional spring is installed in the mounting hole, the first elastic arm of torsional spring stretches into in the breach, the second elastic arm stretch out from the one end of mounting hole and with the one side cooperation of connecting axle, at the divide-shut brake rotation in-process of hasp, the hasp resets and takes place deformation messenger's distortion portion to drive the hasp rotation under the normal running fit of first elastic arm and support, first elastic arm swings between drive wall and spacing wall. The utility model discloses a space that the hasp piece that resets occupied is little, does benefit to the miniaturized design of circuit breaker.

Description

Small-sized circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus, concretely relates to miniature circuit breaker.

Background

A circuit breaker is a common switching element used in an electric power system to turn on and off an electric circuit and automatically break the electric circuit when an overcurrent or leakage fault occurs in the electric circuit. The circuit breaker utilizes the hasp that forms the hasp structure and jumps to detain the operation that realizes the contact mechanism divide-shut brake usually, in miniature circuit breaker, still need set up the hasp usually and reset the piece, reset the piece and be used for keeping overlap joint stable in the initial stage of closing a floodgate, provide the power that resets for the hasp in the separating brake period, nevertheless in current design, reset the piece and install the back at the hasp usually and rotate jointly with the hasp, its movement track need occupy certain space, is unfavorable for the miniaturized design of circuit breaker.

Disclosure of Invention

An object of the utility model is to overcome prior art's defect, provide a small-size circuit breaker that the volume is less, compact structure and reliability are high.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a miniature circuit breaker comprises a shell and an operating mechanism arranged in the shell, wherein the operating mechanism comprises a support, a jump buckle and a lock catch, wherein the jump buckle and the lock catch are pivotally arranged on the support and form hasp connection; be equipped with in the mounting hole and be used for making the hasp to resume the hasp piece that resets of normal position after the separating brake finishes, the hasp resets including installing the portion of buckling in the mounting hole, the both ends of the portion of buckling are regarded as first elastic arm respectively, the outside extension of second elastic arm, and leave the contained angle between first elastic arm and the second elastic arm, the first elastic arm of torsional spring passes the breach and stretch out outside the breach and the edge cooperation of support, the second elastic arm of torsional spring stretch out and cooperate with one side of connecting axle from the one end of mounting hole, at the divide-shut brake rotation in-process of hasp, the hasp piece that resets takes place deformation in the normal running fit of first elastic arm and support, and make the portion of warping drive the hasp rotation, first elastic arm swings between drive wall and spacing wall this moment.

Further, the hasp includes the actuating arm the edge of actuating arm is equipped with the through-hole structure as the mounting hole, the breach is located the upside of mounting hole, and the lateral wall that the breach is close to connecting axle one side is as the drive wall, and the lateral wall that connecting axle one side was kept away from to the breach is as spacing wall to drive wall and spacing wall make the breach be big-end-up's fan-shaped, first elastic arm can swing between drive wall and spacing wall, second elastic arm extend the downside of connecting axle and with the downside cooperation of connecting axle.

Furthermore, a stop block is arranged at one end, extending out of the lock catch, of the connecting shaft, the stop block is arranged on the lower side of the connecting shaft in a protruding mode, and a gap for the second elastic arm to penetrate through is formed in the stop block.

Further, the tail end of the first elastic arm is bent to form an abutting part, and the abutting part abuts against the edge of the support.

Furthermore, the lock catch reset piece is a torsion spring, and an included angle between a first elastic arm and a second elastic arm of the torsion spring is minus degree.

Furthermore, the hasp includes integrated into one piece's hasp arm and actuating arm, the hasp arm is used for forming hasp structure with jumping the knot, the actuating arm is used for promoting the hasp rotation with the short-circuit protection mechanism cooperation that sets up in the casing, makes hasp and jumps the hasp structure unblock that the knot formed.

Furthermore, the short-circuit protection mechanism comprises an electromagnetic release, the electromagnetic release comprises a magnetic yoke, a coil arranged on the magnetic yoke and an iron core arranged on the inner side of the coil, one end of the iron core is opposite to a driving arm of the lock catch, and the coil drives the iron core to push the driving arm of the lock catch to enable the lock catch to rotate when a circuit is in short circuit, so that the lock catch and a hasp structure formed by jumping the lock catch are unlocked.

Further, a handle is rotatably mounted on the upper portion of the shell, an incoming line terminal and an outgoing line terminal are respectively arranged on two sides of the shell, and an operating mechanism, a contact mechanism, a motor and a circuit board are arranged between the incoming line terminal and the outgoing line terminal; the automatic opening and closing device is characterized in that a transmission mechanism is arranged between the motor and the handle, the operating mechanism and the transmission mechanism are arranged on the upper side of the surface of the circuit board in a stacking mode, a control circuit is arranged on the circuit board, the circuit board controls the motor to rotate through the control circuit and is driven by the transmission mechanism, and the automatic opening and closing of the contact mechanism is achieved under the matching of the transmission mechanism, the handle and the operating mechanism.

Further, an arc extinguishing system and a short-circuit protection mechanism are arranged between the incoming line terminal and the outgoing line terminal, the contact mechanism is positioned in the middle of the shell, and a moving contact of the contact mechanism is connected with the operating mechanism; the motor is located between incoming line terminal and the contact mechanism, and drive mechanism is located between motor and the handle, and drive mechanism transmits the power of motor to the handle, the arc extinguishing system sets up in the lower part of casing to the arc extinguishing system is located one side of contact mechanism, and short-circuit protection mechanism is located between arc extinguishing system and the handle.

Further, a partition board is arranged in the shell and arranged between the transmission mechanism and the operating mechanism, the operating mechanism and the contact mechanism are located on one side of the surface of the partition board, and the transmission mechanism, the circuit board and the motor are located on one side of the back face of the partition board.

The utility model discloses a miniature circuit breaker, be provided with the hasp piece that resets in the casing, wherein the hasp piece that resets is installed in the mounting hole of hasp, at the divide-shut brake rotation in-process of hasp, the hasp piece that resets takes place deformation under the cooperation of second elastic arm and connecting axle, make first elastic arm respectively with the drive wall, spacing wall cooperation realizes the promotion to the hasp, the hasp piece that resets occupies space less in the casing, and the mounting hole resets for the hasp and provides the motion space, avoid reserving the motion space in the casing, it occupies still less space to compare current hasp piece that resets, do benefit to the miniaturized design of circuit breaker.

In addition, be equipped with on first elastic arm and support the portion of leaning on, be equipped with the dog on the connecting axle, support the portion of leaning on and the dog all is used for the axial motion that the restriction hasp reset the piece, has guaranteed the stability that the hasp reset the piece.

In addition, the lock catch reset piece is a torsion spring, so that the lock catch reset piece is convenient to process and low in cost.

Drawings

Fig. 1-4 are schematic structural diagrams (when closing) of a miniature circuit breaker according to the present invention;

fig. 5-6 are schematic structural diagrams (opening) of a miniature circuit breaker according to the present invention;

fig. 7 is a schematic structural view (external) of a miniature circuit breaker according to the present invention;

fig. 8-9 are schematic structural views (inside) of a miniature circuit breaker according to the present invention;

fig. 10-12 are schematic structural views of a first embodiment of a latch release of a miniature circuit breaker according to the present invention;

fig. 13-14 are schematic structural views illustrating a second embodiment of a latch reset device of a miniature circuit breaker according to the present invention.

Detailed Description

The following describes a detailed embodiment of a miniature circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 14. The present invention is not limited to the description of the following embodiments.

As shown in fig. 1-7 and 9, a miniature circuit breaker comprises a housing 1 and a handle 2 rotatably mounted on the upper part of the housing 1, wherein a wire inlet terminal 31 and a wire outlet terminal 32 are respectively arranged on two sides of the housing 1, and an operating mechanism 4, a contact mechanism, an arc extinguishing system 83, a motor 81 and a circuit board 7 are arranged between the wire inlet terminal 31 and the wire outlet terminal 32; a transmission mechanism 6 is arranged between the motor 81 and the handle 2, a control circuit is arranged on the circuit board 7, the circuit board 7 (see fig. 9) controls the motor 81 to rotate through the control circuit and is transmitted by the transmission mechanism 6, and the automatic opening and closing of the contact mechanism is realized under the matching of the transmission mechanism 6, the handle 2 and the operating mechanism 4.

A wire inlet 12 and a wire outlet corresponding to the wire inlet terminal 31 and the wire outlet terminal 32 are respectively arranged on two sides of the shell 1, the circuit board 7 is laid in the shell 1 between the wire inlet terminal 31 and the wire outlet terminal 32, and the operating mechanism 4 and the transmission mechanism 6 are arranged on the upper side of the surface of the circuit board 7 in a laminating manner; the handle 2 and the operating mechanism 4 are arranged on the upper part of the shell 1 together, and the handle 2 is connected with the operating mechanism 4; the contact mechanism is positioned in the middle of the shell 1, and a moving contact 51 of the contact mechanism is connected with the operating mechanism 4; the motor 81 is positioned between the incoming line terminal 31 and the contact mechanism, the transmission mechanism 6 is positioned between the motor 81 and the handle 2, the transmission mechanism 6 transmits the power of the motor 81 to the handle 2, the control circuit on the circuit board 7 controls the motor 81 to rotate, and the transmission mechanism 6 is driven by the motor 81 to rotate so as to realize the automatic opening and closing of the circuit breaker; the arc extinguishing system 83 is arranged at the lower part of the shell 1, the arc extinguishing system 83 is positioned at one side of the contact mechanism, and electric arcs generated after the contact mechanism is switched on and off are led into the arc extinguishing system 83 to be extinguished; a short-circuit protection mechanism 82 is further disposed in the housing 1, the short-circuit protection mechanism 82 is located between the arc extinguishing system 83 and the handle 2, and a current detection device 84 is disposed between the short-circuit protection mechanism 82 and the outlet terminal 32.

Preferably, as shown in fig. 7, the housing 1 of the present embodiment includes a base 1a and an upper cover 1b covering the base 1a, and the incoming line 12 and the outgoing line are located in the middle of two sides of the housing 1 and are surrounded by the base 1a and the upper cover 1 b. A partition 14 (see fig. 12, in which only a small part of the partition 14 is shown) is further provided in the housing 1, the operating mechanism 4, the contact mechanism and the transmission mechanism 6 are provided on the upper side of the surface of the circuit board 7, the transmission mechanism 6 is located between the circuit board 7 and the operating mechanism 4, the partition 14 is provided between the transmission mechanism 6 and the operating mechanism 4, the contact mechanism, the short-circuit protection mechanism 82 and the arc extinguishing system 83 are located on one side of the surface of the partition 14, the transmission mechanism 6, the circuit board 7 and the motor 81 are located on one side of the back of the partition 14, and meanwhile, the partition 14 may also provide the operating mechanism 4 with a protruding structure as a rotation fulcrum.

As shown in fig. 1-6, 8 and 13, one end of the operating mechanism 4 is connected to the handle 2, the other end of the operating mechanism 4 is connected to the moving contact 51 of the contact mechanism, a transmission mechanism 6 is disposed between the motor 81 and the handle 2, the motor 81 is driven by the control circuit of the circuit board 7 to rotate forward and backward, the transmission mechanism 6 is provided with a closing portion (not shown) and a separating portion 61a, the closing portion is capable of cooperating with the handle 2, the motor 81 rotates forward under the control of the circuit board 7 when closing, the closing portion cooperates with the handle 2 to drive the handle 2 to rotate in a closing direction, after closing is completed, the motor 81 rotates backward to disengage the closing portion from the handle 2, and the closing portion returns to its original position; an elastic sliding mechanism 44 which can be matched with the brake separating part 61a is arranged in the shell 1, the operating mechanism 4 comprises a jump buckle 41, a lock catch 42 and a brake separating piece 43 connected on the lock catch 42, the jump buckle 41 and the lock catch 42 form a hasp structure, when the circuit breaker is opened, the motor 81 rotates reversely under the control of the circuit board 7, the opening part 61a cooperates with the elastic sliding mechanism 44 to make the elastic sliding mechanism 44 slide, the elastic sliding mechanism 44 pushes the opening piece 43 to rotate to make the hasp structure formed by the trip 41 and the lock catch 42 unlock, the trigger operating mechanism 4 trips to realize the opening of the circuit breaker, the opening part 61a can stay for a certain time at the opening position, the stay time is designed according to actual needs and is controlled by a control circuit of the circuit board 7, the elastic sliding mechanism 44 limits the movement of the opening part 43, the lock catch 42 and the trip catch 41 can not form a buckle, and the breaker can not be closed temporarily.

As shown in fig. 2, 8, and 9, the transmission mechanism 6 includes a plurality of transmission gears connected in a meshing manner, each of the transmission gears includes a handle gear and an intermediate gear 61, a protruding structure serving as a closing portion is protruded from the handle gear, the closing portion rotates along with the rotation of the handle gear, when the handle gear rotates in a closing direction, the closing portion and the handle 2 form a matching structure, preferably, a matching portion (not shown) is provided on the handle 2, the matching portion is a groove structure into which the closing portion is inserted, or a protruding structure abutting against a side surface of the closing portion, and after the closing portion and the matching portion form a limiting structure matching with each other, the handle 2 rotates in the closing direction along with the closing rotation of the handle gear; a convex structure is convexly arranged on the intermediate gear 61 as a switching-off part 61a, the switching-off part 61a rotates along with the intermediate gear 61, when the intermediate gear 61 rotates in the switching-off direction, the switching-off part 61a rotates in the direction away from the handle 2 and rotates along with the intermediate gear 61 continuously in the switching-off direction, and the switching-off part 61a can trigger the operating mechanism 4 to trip, specifically, as the switching-off part 61a rotates along with the intermediate gear 61 continuously in the switching-off direction, the switching-off part 61a approaches the elastic sliding mechanism 44 and rotates the switching-off piece 43 through the cooperation with the elastic sliding mechanism 44, so that the buckle structure formed by the tripping buckle 41 and the locking buckle 42 is unlocked, and the switching-off of the circuit breaker is realized.

An improvement point of this application lies in, sets up an elastic sliding mechanism 44 in casing 1, and the separating brake portion 61a that sets up on intermediate gear 61 realizes the separating brake through cooperating with elastic sliding mechanism 44, can dwindle the motion space of separating brake portion 61a, does benefit to the miniaturized design of circuit breaker. Preferably, the elastic sliding mechanism 44 is disposed between the handle 2 and the operating mechanism 4, the elastic sliding mechanism 44 includes a sliding block 441 and an elastic member 442 connected to the sliding block 441, the sliding block 441 is slidably mounted inside the housing 1 and can reciprocate inside the housing 1 under the action of the opening part 61a and the elastic member 442, when the sliding block 441 reciprocates, when the opening part 61a pushes the sliding block 441, the sliding block 441 can contact with the opening part 43 and push the opening part 43 to rotate so as to unlock the trip 41 and the latch 42, and after the opening part 61a is separated from the sliding block 441, the elastic member 442 provides an elastic driving force for the sliding block 441 to restore the sliding block 441 to the original position, and the sliding block 441 is separated from the opening part 43. The elastic sliding mechanism 44 is obliquely arranged between the handle 2 and the operating mechanism 4, and the brake separating piece 43 is arranged at the upper end of the lock catch 42 close to the handle 2, so that the layout is reasonable, and the structure is compact.

An embodiment of the elastic sliding mechanism 44 is provided, wherein the elastic sliding mechanism 44 comprises a sliding block 441 and an elastic member 442, and preferably, a guiding structure is provided between the sliding block 441 and the housing 1 or the partition 14 disposed in the housing 1, and the guiding structure generally comprises a guiding groove 441a and a guiding column (not shown in the figure) which are slidably engaged with each other. In this embodiment, a guide groove 441a is provided on the slider 441, a guide post (not shown) is provided on one side of the partition 14 in a protruding manner, the guide post extends into the guide groove 441a, and the guide groove 441a is slidably engaged with the guide post to realize a reciprocating motion under the driving of the opening portion 61a and the elastic member 442; the upper surface of the sliding block 441 is used as a pushing surface 441b to be matched with the opening member 43 and used for pushing the opening member 43 to rotate to trigger the operating mechanism 4 to trip, a convex structure which is used as a pushing part 441c is arranged on one side of the sliding block 441 close to the opening part 61a, and in the opening process, the pushing part 441c is matched with the opening part 61a, so that the sliding block 441 is pushed under the action of the opening part 61a, and meanwhile, the pushing surface 441b is in contact with the opening member 43 and pushes the opening member 43 to rotate to trigger the operating mechanism 4 to trip; a mounting groove 441d is formed at an upper portion of the slider 441, one end of the elastic member 442 is fitted into the mounting groove 441d, and the other end of the elastic member 442 is fixed to the housing 1.

Preferably, as shown in fig. 1 to 6 and 8 and 13, the slider 441 is a rectangular parallelepiped, a rectangular groove structure is provided in the middle of the slider 441 as a guide groove 441a, and a guide post capable of extending into the guide groove 441a is protruded on one side of the partition 14. The upper surface of the sliding block 441 is in a step shape and serves as a pushing surface 441b, when the pushing surface 441b pushes the opening member 43 to rotate, the step-shaped pushing surface 441b can prevent the opening member 43 from rolling on the pushing surface 441b, one side of the pushing surface 441b, which is close to the opening portion 61a, extends to one side, which is close to the intermediate gear 61, to form a convex edge serving as a pushing portion 441c, the lower surface of the pushing portion 441c is used for being matched with the opening portion 61a to push the sliding block 441 to move in the housing 1, and the upper surface of the pushing portion 441c is provided with an installation groove 441d for being fixedly connected with the elastic member 442, and the elastic sliding mechanism 44 with the structure can occupy the space inside of the housing 1 as little as possible, thereby being beneficial to the miniaturization. Of course, the pushing portion 441c may be disposed at the middle or bottom of the sliding block 441, but this requires that a mounting groove 441d for mounting the elastic member 442 be disposed on the pushing surface 441b, which easily interferes with the pushing action of the pushing surface 441b on the shutter member 43.

In the present embodiment, as shown in fig. 2, 8 and 9, the transmission mechanism 6 includes a worm and a plurality of transmission gears including an intermediate gear 61 engaged with the latch 42 of the operating mechanism 4 and a handle gear engaged with the handle 2, and the motor 81 is engaged with the transmission gears through the worm, wherein the intermediate gear 61 is engaged with the handle gear for transmission, and the handle gear is coaxially installed with the handle 2.

In the application, the motor 81 can drive the opening of the contact 51 mechanism through the driving of the transmission mechanism 6, the driving of the short-circuit protection mechanism 82 or the direct manual operation of the handle 2, the operating mechanism 4 drives the moving contact 51 to swing through the swinging of the handle 2, the swinging of the moving contact 51 finishes the action of separating from the static contact 52 to realize the opening, the motor 81 drives the opening part 43 through the transmission mechanism 6 to push the latch 42, the iron core of the short-circuit protection mechanism 82 pushes the latch 42 to unlock the latch 42 and the trip 41, and the operating mechanism 4 loses balance and drives the opening of the contact 51 mechanism through the energy release of the energy storage mechanism.

The operating mechanism 4 is specifically shown in fig. 1-5, 8 and 10, and includes a support 48 which is pivotally installed, and a latch 42 and a trip 41 which are respectively pivotally installed on the support 48, the latch 42 includes a latch arm 421, a latch portion 421a is provided at an end of the latch arm 421, the latch portion 421a is in latch fit with one end of the trip 41, a trip member 43 is hinged to a middle portion of the latch arm 421, preferably, a fulcrum corresponding to the middle portion of the trip member 43 is provided inside the housing 1, the other end of the trip 41 is in linkage connection with the handle 2 through a link, and a moving contact 51 of the contact mechanism is coaxially installed with the support 48. The operating mechanism 4 keeps balance when the lock catch 42 and the jump buckle 41 are mutually in hasp fit, the operating mechanism 4 drives the movable contact 51 to swing through the swinging of the handle 2, and the swinging of the movable contact 51 finishes the action of contacting and separating with and from the fixed contact 52.

As shown in fig. 8 and 10-14, the latch 42 is rotatably mounted on the support 48 through a connecting shaft 47, the latch 42 includes an integrally formed latch arm 421 and a driving arm 422, the latch arm 421 is configured to form a latch structure with the jumper 41, the driving arm 422 is configured to cooperate with the iron core of the short-circuit protection mechanism 82 to push the latch 42 to rotate so as to unlock the latch structure formed by the latch 42 and the jumper 41, a latch resetting member made of an elastic material is disposed in the housing 1, and the latch resetting member enables the latch 42 to push the latch 42 to return to the original position after the opening is completed, which serves as an improvement point of the present application, and the movement of the latch resetting member does not occupy too much space.

An embodiment of the first latch resetting member is provided with reference to fig. 10 to 12, the latch resetting member is installed inside the housing 1 and located at one side of the operating mechanism 4, the latch resetting member includes an installation portion 451 and an elastic resetting arm 452, the installation portion 451 is installed inside an upper side wall of the housing 1, the elastic resetting arm 452 is located above the latch 42, when the latch is opened, a lower portion of the elastic resetting arm 452 abuts against the latch 42, and is pressed by the latch 42 during opening rotation of the latch 42 to generate a driving force for resetting the latch 42, and when the latch is closed, a lower portion of the elastic resetting arm 452 is separated from the latch 42.

Specifically, the slot 11 for installing the installation portion 451 is disposed on the inner side of the upper side wall of the housing 1, the latch resetting member may be installed in the housing 1 through the slot 11, which is favorable for installation and replacement, preferably, the slot 11 is located at a corner of the upper portion of the housing 1, and the lower portion of the elastic resetting arm 452 corresponds to the upper portion of the joint 42a between the latch arm 421 and the driving arm 422, in fig. 10 and 12, the elastic resetting arm 452 is a rod-shaped structure having a bent portion in the middle portion, preferably, the elastic resetting arm 452 is made of a plastic material, which is favorable for being pressed and deformed when the latch 42 is opened and rotated, and is prevented from being broken due to pressing, of course, only the elastic resetting arm 452 may be made of an elastic plastic material, and the installation portion 451 is made of other materials, which may increase the processing cost, and is not favorable for ensuring the connection. When the brake is switched off, the lower part of the elastic reset arm 452 abuts against the upper end surface of the joint 42a, and along with the unlocking of the lock catch 42 and the buckle structure of the jump buckle 41, the joint 42a moves towards the direction close to the mounting part 451, and at the moment, the elastic reset arm 452 is squeezed to generate an elastic reset force for restoring the lock catch 42 to the original position; when the switch is closed, the joint 42a moves in a direction away from the mounting portion 451 under the driving of the elastic driving arm 422, and the lower portion of the elastic restoring arm 452 is separated from the upper end surface of the joint 42a after the latch 42 and the jumper 41 are in snap-fit connection. Compare and install the hasp piece that resets that the back is rotatory along with hasp 42 at the hasp 42 now, the hasp of this embodiment resets and can not rotate along with hasp 42 to need not reserve the required space of hasp piece motion in casing 1, and the joint department 42a of hasp 42 hasp arm 421 and actuating arm 422 corresponds the corner on casing 1 upper portion usually, therefore the hasp resets and preferably sets up the corner department at casing 1, has reduced the hasp and has reset the shared space of piece in casing 1, does benefit to the miniaturized design of circuit breaker.

In connection with fig. 13-14, an embodiment of a second latch resetting member is provided, the latch resetting member is installed on the latch 42, the latch resetting member includes a torsion portion 461, two ends of the torsion portion 461 respectively serve as a first elastic arm 462 and a second elastic arm 463 extending outwards, and an included angle is left between the first elastic arm 462 and the second elastic arm 463, preferably, the latch resetting member is a torsion spring, the included angle between the first elastic arm 462 and the second elastic arm 463 of the torsion spring is 60-300 °, since the first elastic arm 462 and the second elastic arm 463 provide a deformation force for the torsion portion 461, the included angle between the first elastic arm 462 and the second elastic arm 463 can also be understood as an included angle in a force-receiving direction, an installation hole 423 is provided at an edge of the latch 42, and a notch 4231 is provided at one side of the installation hole 423, the notch 4231 is located at an upper side of the installation hole 423, two side walls of the notch 4231 respectively serve as a driving wall 4232 and a limit wall 4233, the torsion portion 461 of the torsion spring is installed in the installation hole 423, the first elastic arm 462 of the torsion spring passes through the notch 4231 and extends out of the notch 4231, the first elastic arm 462 is matched with the edge of the support 48, the second elastic arm 463 of the torsion spring extends out of one end of the installation hole 423 and is matched with one side of the connecting shaft 47, during the opening and closing rotation of the latch 42, the latch resetting piece deforms in the rotation matching of the first elastic arm 462 and the support 48, and the torsion portion 461 drives the latch 42 to rotate, and during the process, the first elastic arm 462 swings between the driving wall 4232 and the limiting wall 4233.

As shown in fig. 14, the mounting hole 423 is a through hole structure disposed at the edge of the driving arm 422, but the mounting hole 423 may also be a groove structure, which requires axial positioning of the torsion portion 461 mounted therein. The notch 4231 is located on the upper side of the mounting hole 423, preferably, the driving wall 4232 and the limiting wall 4233 enable the notch 4231 to be in a fan shape with a large upper part and a small lower part, a side wall of the notch 4231 close to one side of the connecting shaft 47 serves as the driving wall 4232, a side wall of the notch 4231 far away from one side of the connecting shaft 47 serves as the limiting wall 4233, the first elastic arm 462 swings between the driving wall 4232 and the limiting wall 4233, an abutting part 4621 used for abutting against the edge of the support 48 is formed by bending the tail end of the first elastic arm 462 to limit axial movement of the latch resetting piece, and correspondingly, the second elastic arm 463 extends to the lower side of the connecting shaft 47 and is matched with the lower side. Preferably, one end of the connecting shaft 47 extending out of the latch 42 is provided with a stopper 471, the stopper 471 is convexly disposed at a lower side of the connecting shaft 47, and preferably, a gap for the second elastic arm 463 to pass through is disposed on the stopper 471 for limiting the axial movement of the torsion spring, and of course, the stopper 471 is disposed with other structures capable of being used for limiting the second elastic arm 463, and is also applicable to this embodiment. During opening, as the latch 42 is opened and rotated, the first elastic arm 462 is rotatably engaged with the support 48, and simultaneously the lower side of the connecting shaft 47 is engaged with the second elastic arm 463 to make the torsion portion 461 drive the latch 42 to rotate (counterclockwise rotation in fig. 13 and 14), in this process, the first elastic arm 462 swings from contacting with the limit wall 4233 to contacting with the driving wall 4232, as the latch 42 continues to open and rotate, the torsion spring is elastically deformed and stores energy, after the opening and rotating of the latch 42 is completed, the torsion spring releases energy to make the latch 42 rotate in the direction of closing and rotating, and after the latch 42 is restored to the original position, the first elastic arm 462 is also rotated from engaging with the driving wall 4232 to engage with the limit wall 4233.

The contact mechanism comprises a moving contact 51 and a fixed contact 52 which are matched with each other, the moving contact 51 is rotatably arranged on the operating mechanism 4 and is coaxially arranged with a support 48 of the operating mechanism 4, and the moving contact 51 is connected with the incoming line terminal 31; the static contact 52 is fixedly arranged in the middle of the housing 1, the static contact 52 includes a static contact plate and a static contact arranged on the static contact plate, the static contact plate is fixed in the middle of the housing 1, and one end of the static contact plate extends towards the direction of the outlet terminal 32 and is connected with the outlet terminal 32.

The arc extinguishing system 83 comprises an arc extinguishing chamber and two arc barriers 831, the arc extinguishing chamber is arranged between a fixed contact 52 and a line outlet terminal 32, the arc barriers 831 are arranged on one side of the arc extinguishing chamber close to a contact mechanism, the two arc barriers 831 are arranged and are respectively arranged on two sides of the contact mechanism, so that a moving contact 51 and a fixed contact 52 of the contact mechanism are switched on and off between the two arc barriers 831, electric arcs generated by switching on and off of the contact mechanism are limited between the two arc barriers 831, an arc striking plate is arranged between the two arc barriers 831, and the arc striking plate extends towards the arc extinguishing chamber and is used for introducing the electric arcs generated by switching on and off of the contact mechanism into the arc extinguishing chamber.

The short-circuit protection mechanism 82 comprises an electromagnetic release which is located on one side of the operating mechanism 4, and when a short-circuit fault occurs on a circuit, the electromagnetic release is triggered to unlock and release the lock catch 42 and the trip catch 41 of the operating mechanism 4 to drive the moving contact 51 to realize opening. Specifically, the short-circuit protection mechanism 82 includes an electromagnetic release, the electromagnetic release includes a magnetic yoke, a coil disposed on the magnetic yoke and connected to the stationary contact 52, and an iron core disposed inside the coil, one end of the iron core is opposite to the driving arm 422 of the latch 42, one end of the stationary contact plate is connected to the magnetic yoke, two ends of the coil are respectively connected to the outgoing line terminal 32 and the stationary contact plate, the coil drives the iron core to push the driving arm 422 of the latch 42 to rotate the latch 42 when the line is short-circuited, so as to unlock the latch structure formed by the latch 42 and the jump buckle 41.

An improvement point of the present application lies in that, as shown in fig. 6, 7, and 9, the communication terminal 71 of the circuit board 7 is disposed on one side of the circuit board 7 close to the incoming terminal 31, and the housing 1 is provided with the communication interface 13 corresponding to the communication terminal 71, the communication interface 13 and the incoming port 12 are located on the same side wall of the housing 1, so that the circuit breaker wiring is unified in the direction of two sides of the housing 1, that is, the incoming line and the outgoing line are respectively on two sides of the housing 1, and other directions of the circuit breaker are not occupied, thereby saving the installation space of the circuit breaker. In this embodiment, both the wire inlet terminal 31 and the wire outlet terminal 32 are provided with the binding screws 3a, and the binding screws 3a of the wire inlet terminal 31 and the binding screws 3a of the wire outlet terminal 32 are respectively located above the wire inlet 12 and the wire outlet, preferably, the communication interface 13 and the binding screws 3a keep the same height, preferably, as shown in fig. 7, the communication interface 13 is arranged on the upper cover 1b or the base 1a, in fig. 7, the communication interface is arranged in the middle of one side of the base 1a, rectangular grooves are arranged in the middle of both sides of the base 1a and the upper cover 1b, the wire inlet 12 and the wire outlet are formed by the grooves in the middle of both sides of the base 1a and the upper cover 1b, and at this time, the communication interface 13 is located on the base 1a, and is located forward relative to the wire inlet 12 in the middle, which is.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (10)

1. A miniature circuit breaker, includes casing (1) and operating device (4) of setting in casing (1), operating device (4) include support (48) and pivot mounting jump knot (41), hasp (42) on support (48), jump knot (41), hasp (42) form the hasp connection, and hasp (42) rotate through connecting axle (47) and install on support (48), its characterized in that: a mounting hole (423) is formed in the edge of the lock catch (42), a notch (4231) is formed in one side of the mounting hole (423), and two side walls of the notch (4231) are respectively used as a driving wall (4232) and a limiting wall (4233); the mounting hole (423) is internally provided with a latch resetting piece for enabling the latch (42) to restore to the original position after the opening and closing are finished, the latch resetting piece comprises a twisting part (461) mounted in the mounting hole (423), two ends of the twisting part (461) are respectively used as a first elastic arm (462) and a second elastic arm (463) to extend outwards, an included angle is reserved between the first elastic arm (462) and the second elastic arm (463), the first elastic arm (462) of the torsion spring passes through the notch (4231) and extends out of the notch (4231) to be matched with the edge of the support (48), the second elastic arm (463) of the torsion spring extends out of one end of the mounting hole (423) and is matched with one side of the connecting shaft (47), and in the opening and closing brake rotating process of the latch (42), the latch resetting piece deforms in the rotating matching of the first elastic arm (462) and the support (48), and enables the twisting part (461) to drive the latch (42) to rotate, at this time, the first elastic arm (462) swings between the driving wall (4232) and the stopper wall (4233).

2. A miniature circuit breaker according to claim 1, wherein: the lock catch (42) comprises a driving arm (422), a through hole structure serving as a mounting hole (423) is arranged on the edge of the driving arm (422), the notch (4231) is located on the upper side of the mounting hole (423), the side wall, close to the connecting shaft (47), of the notch (4231) serves as a driving wall (4232), the side wall, far away from the connecting shaft (47), of the notch (4231) serves as a limiting wall (4233), the driving wall (4232) and the limiting wall (4233) enable the notch (4231) to be in a fan shape with a large upper portion and a small lower portion, the first elastic arm (462) can swing between the driving wall (4232) and the limiting wall (4233), and the second elastic arm (463) extends to the lower side of the connecting shaft (47) and is matched with the lower side of the connecting shaft (47).

3. A miniature circuit breaker according to claim 2, wherein: one end, extending out of the lock catch (42), of the connecting shaft (47) is provided with a stop block (471), the stop block (471) is arranged on the lower side of the connecting shaft (47) in a protruding mode, and a gap for the second elastic arm (463) to penetrate through is formed in the stop block (471).

4. A miniature circuit breaker according to claim 1, wherein: an abutting part (4621) is formed by bending at the tail end of the first elastic arm (462), and the abutting part (4621) abuts against the edge of the support (48).

5. A miniature circuit breaker according to claim 1, wherein: the lock catch reset piece is a torsion spring, and an included angle between a first elastic arm (462) and a second elastic arm (463) of the torsion spring is 60-300 degrees.

6. A miniature circuit breaker according to claim 1, wherein: hasp (42) are including integrated into one piece's hasp arm (421) and drive arm (422), hasp arm (421) are used for forming hasp structure with jump knot (41), drive arm (422) are used for with short-circuit protection mechanism (82) cooperation promotion hasp (42) rotation that sets up in casing (1), make hasp (42) and jump the hasp structure unblock that knot (41) formed.

7. A miniature circuit breaker according to claim 6, wherein: the short-circuit protection mechanism (82) comprises an electromagnetic release, the electromagnetic release comprises a magnetic yoke, a coil arranged on the magnetic yoke and an iron core arranged on the inner side of the coil, one end of the iron core is opposite to a driving arm (422) of the lock catch (42), the coil drives the iron core to push the driving arm (422) of the lock catch (42) to enable the lock catch (42) to rotate when a circuit is short-circuited, and then the lock catch (42) and a buckle structure formed by the jump buckle (41) are unlocked.

8. A miniature circuit breaker according to claim 1, wherein: a handle (2) is rotatably mounted on the upper part of the shell (1), an incoming line terminal (31) and an outgoing line terminal (32) are respectively arranged on two sides of the shell (1), and an operating mechanism (4), a contact mechanism, a motor (81) and a circuit board (7) are arranged between the incoming line terminal (31) and the outgoing line terminal (32); be provided with drive mechanism (6) between motor (81) and handle (2), operating device (4), drive mechanism (6) are all range upon range of and are set up at the surperficial upside of circuit board (7), are equipped with control circuit on circuit board (7), and circuit board (7) are passed through control circuit control motor (81) and are rotated and by drive mechanism (6) transmission, realize contact mechanism's automatic divide-shut brake under drive mechanism (6) and handle (2), operating device (4) cooperation.

9. A miniature circuit breaker according to claim 8, wherein: an arc extinguishing system (83) and a short-circuit protection mechanism (82) are further arranged between the incoming line terminal (31) and the outgoing line terminal (32), the contact mechanism is located in the middle of the shell (1), and a moving contact (51) of the contact mechanism is connected with the operating mechanism (4); the motor (81) is located between inlet terminal (31) and the contact mechanism, and drive mechanism (6) are located between motor (81) and handle (2), and drive mechanism (6) transmit the power of motor (81) to handle (2), arc extinguishing system (83) set up in the lower part of casing (1) to arc extinguishing system (83) are located one side of contact mechanism, and short-circuit protection mechanism (82) are located between arc extinguishing system (83) and handle (2).

10. A miniature circuit breaker according to claim 8, wherein: a partition plate (14) is arranged in the shell (1), the partition plate (14) is arranged between the transmission mechanism (6) and the operating mechanism (4), the operating mechanism (4) and the contact mechanism are located on one side of the surface of the partition plate (14), and the transmission mechanism (6), the circuit board (7) and the motor (81) are located on one side of the back face of the partition plate (14).

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