CN221125852U - Small-sized circuit breaker - Google Patents

Abstract

The utility model belongs to the field of low-voltage switch equipment, and particularly relates to a miniature circuit breaker, wherein an operating mechanism has a normal opening and closing state and a tripping and opening state; the indicating mechanism comprises an indicating window arranged on the side wall of the shell and a first indicating plate formed by protruding at the inner side of the indicating window; the indication rotating piece comprises a center column and a second indication plate which is positioned at one side of the center column and connected through a third side connecting plate; a gap for inserting the first indicating plate is formed between the second indicating plate and the central column, and the indicating rotating piece rotates under the action of the operating mechanism, wherein the indicating rotating piece is provided with a fault indicating state that the second indicating plate blocks the first indicating plate to enable the corresponding operating mechanism of the second indicating plate to be in a tripping and opening state in the indicating window, and a normal indicating state that the second indicating plate rotates out to enable the corresponding operating mechanism of the first indicating plate to be in a normal switching-on and switching-off state in the indicating window; the outer surfaces of the first indicator plate and the second indicator plate are different colors. The indicating mechanism is convenient for operators to distinguish.

Description

Small-sized circuit breaker

Technical Field

The utility model belongs to the field of low-voltage switch equipment, and particularly relates to a miniature circuit breaker.

Background

Miniature circuit breakers, also known as molded case circuit breakers, are used for switching low voltage circuits and for fault power-off protection of the circuit, such as short circuits, overloads, etc. At present, an indication structure is generally arranged in the miniature circuit breaker and is generally matched with an operating mechanism to indicate the opening and closing state, but the opening state in the miniature circuit breaker comprises normal opening and fault trip opening, and an operator cannot distinguish the two opening states by the existing indication structure.

Disclosure of utility model

The utility model aims to overcome the defects and shortcomings of the prior art and provides a miniature circuit breaker.

The technical scheme adopted by the utility model is as follows: a miniature circuit breaker comprises a shell, a handle, an operating mechanism, a moving contact, a fixed contact and an indicating mechanism,

The operating mechanism has a normal opening and closing state and a tripping and opening state;

the indicating mechanism comprises an indicating window arranged on the side wall of the shell, a first indicating plate formed by protruding at the inner side of the indicating window and an indicating rotating piece;

The indicating rotating piece comprises a center column and a second indicating plate which is positioned at one side of the center column and connected through a third side connecting plate;

The central column is hinged and matched with the shell to enable the indication rotating piece to rotate around the central shaft of the central column;

A gap for inserting the first indication plate is formed between the second indication plate and the central column, and the indication rotating piece rotates under the action of the operation mechanism, wherein the indication rotating piece is provided with a fault indication state that the second indication plate blocks the first indication plate to enable the corresponding operation mechanism of the second indication plate to be in a unhooking and opening state in the indication window, and a normal indication state that the second indication plate rotates out to enable the corresponding operation mechanism of the first indication plate to be in a normal opening and closing state in the indication window;

the outer surfaces of the first indicator plate and the second indicator plate are different colors.

The operating mechanism comprises a U-shaped connecting rod, a lever bracket, a lock catch, a jump buckle and a contact rotating frame, wherein the U-shaped connecting rod is connected between the handle and the lock catch, the lever bracket is hinged with the shell at an O axis, the lock catch is hinged with the lever bracket at an A axis, the jump buckle is hinged with the lever bracket at a B axis, the contact rotating frame is hinged with the shell at a C axis, and the lock catch and the jump buckle are in a locking state forming abutting fit and a tripping state separating tripping;

The indicating rotation piece comprises an action lug positioned at one side of the central column;

In the locking state, the jump buckle is abutted with the action lug to enable the indication rotating piece to be kept at the position of the normal indication state, and the jump buckle has an elastic structure to form an energy storage function;

When in a release state, under the action of the energy release of the elastic structure, the indication rotating piece rotates to the position of the fault indication state, and the action lug is positioned on the path of the lever bracket rotating to the re-buckling gate position, so that the lever bracket rotates to the re-buckling gate position, the indication rotating piece is pushed to rotate to the position of the normal indication state, and the elastic structure stores energy again.

The elastic structure is composed of elastic abutting arms positioned on the upper side and the lower side of the second indicating plate and a sixth abutting lug positioned on the inner wall of the shell, and in a normal indicating state, the elastic abutting arms and the sixth abutting lug cooperate to form an energy storage effect, and an elastic driving acting force for rotating the indicating rotating piece to the position where the fault indicating state is located is formed.

The lever bracket is provided with an upper bracket plate, a lower bracket plate and a first side connecting plate, wherein the upper bracket plate and the lower bracket plate are arranged at a certain distance, the first side connecting plate is connected between one sides of the upper bracket plate and the lower bracket plate, the lock catch and the jump buckle are respectively and hinged to the upper bracket plate, and the contact rotating frame is rotatably arranged between the upper bracket plate and the lower bracket plate.

The inner walls of the side plates at the two sides of the shell are provided with a first hinge hole positioned at the O axis and a second hinge hole positioned at the C axis;

The upper end surface of the upper support plate forms a first hinging convex column at the O axis, a second hinging convex column at the A axis, a third hinging convex column at the B axis and a first arc-shaped through groove at the C axis, and the lower end surface of the lower support plate forms a fourth hinging convex column at the O axis and a second arc-shaped through groove at the C axis;

the lock catch is provided with a lock catch plate positioned above the upper support plate, a fourth hinge through hole and a third abutting lug are formed on the lock catch plate, and the fourth hinge through hole is positioned at the A axis and used for a second hinge convex column to pass through so that the lock catch rotates around the A axis relative to the lever support;

The jump button is provided with a fifth hinge through hole and a connecting rod connecting hole, the third hinge convex column penetrates through the jump button to enable the jump button to rotate around the B axis relative to the lever bracket, the handle and the lock catch are connected and transmitted through a U-shaped connecting rod, and one end of the U-shaped connecting rod is inserted into the connecting rod connecting hole;

the contact rotating frame is provided with a third hinge hole arranged at the C shaft and a moving contact installation groove which is matched with one end of the moving contact in a local shape and is used for fixedly installing the moving contact, the contact rotating frame is hinged with the shell through a hinge shaft C, the hinge shaft C penetrates through the third hinge hole, two ends of the hinge shaft C penetrate through the first arc-shaped through groove and the second arc-shaped through groove at the same time, and the hinge shaft C is inserted into the second hinge hole on the inner wall of the shell. The third hinge hole is arranged in the moving contact mounting groove, and the moving contact is limited in the moving contact mounting groove and penetrates through the moving contact through the hinge shaft C to enable the moving contact to form linkage fit with the contact rotating frame.

The lock catch is provided with a second side connecting plate connected to the lower end of one side of the lock catch plate and a hinged plate connected to the second side connecting plate and separated from the lock catch plate by a certain distance; a third hinge through hole is formed in the position of the A shaft on the lower end surface of the lower support plate; the hinge plates are located above the lower support plate and downwards protrude to form two semicircular hinge columns with certain elasticity, the outer edges of the lower ends of the semicircular hinge columns protrude to form clamping blocks, and the two semicircular hinge columns penetrate through the third hinge through holes and the clamping blocks are located below the lower support plate.

The lock catch is provided with a double-gold pull rod integrally formed on the lock catch plate, and the double-gold pull rod is matched with the double-gold assembly; the double-gold pull rod side surface is provided with at least two double-gold abutting and matching blocks positioned at different positions, and the double-gold assembly can be abutted and matched with any one of the double-gold abutting and matching blocks.

The lever bracket and be provided with first torsional spring between the hasp, first torsional spring both ends respectively with the third butt lug and the articulated shaft C butt cooperation of hasp.

A second torsion spring is arranged between the lever bracket and the inner wall of one side of the shell; the second torsion spring comprises a fourth winding, and a fifth action arm and a sixth action arm which are connected to two ends of the fourth winding, a round boss is arranged on the inner wall of the side plate on one side of the shell, a fifth butt joint lug is formed on one side of the round boss, a second butt joint lug is formed on the lower end face of the lower support plate in a protruding mode, the fourth winding is sleeved outside the round boss, and the fifth action arm and the sixth action arm are respectively in butt joint with the second butt joint lug of the lever support and the fifth butt joint lug of the shell.

The first indicating plate and the second indicating plate are arc plates taking the central shaft of the central column as the center of a circle.

The beneficial effects of the utility model are as follows: the indication mechanism only has a fault indication state corresponding to the tripping and opening state of the operating mechanism and a normal indication state corresponding to the normal opening and closing state of the operating mechanism in the display state; is convenient for the operator to distinguish.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that it is within the scope of the utility model to one skilled in the art to obtain other drawings from these drawings without inventive faculty.

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the internal structure of an embodiment of the present utility model;

FIG. 3 is a schematic view showing the cooperation structure of the handle, the operating mechanism and the indicating rotation member according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a partial structure of a housing according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a lever bracket according to an embodiment of the present utility model, wherein (a) and (b) are different views;

FIG. 6 is a schematic diagram of a latch according to an embodiment of the present utility model;

FIG. 7 is a schematic diagram of a jump button according to an embodiment of the present utility model;

FIG. 8 is a schematic view of the structure of a contact turret in one embodiment of the utility model;

FIG. 9 is a schematic view of the structure of the first torsion spring according to one embodiment of the present utility model;

FIG. 10 is a schematic diagram of the structure of the energy-storing torsion spring according to one embodiment of the present utility model, wherein (a) and (b) are different implementation structures respectively;

FIG. 11 is a schematic view of the structure of the second torsion spring according to one embodiment of the present utility model;

FIG. 12 is a schematic view showing the structure of a rotating member according to an embodiment of the present utility model;

FIG. 13 is a schematic diagram of different states of the indicating mechanism according to an embodiment of the present utility model, (a) is a fault indicating state, and (b) is a normal opening and closing state;

A housing-100; round boss-110; a first hinge hole-111; a second hinge hole-112; a fifth abutment bump-113; an indication window-120; a first indicator plate-130; indicating a hinge post-140; a sixth abutment bump-150;

A handle-200;

An operating mechanism-300; u-shaped link-310; lever bracket-320; an upper support plate-321; a first hinge post-3211; second hinge post-3212; a third articulation post-3213; a first arcuate slot-3214; a first abutment bump-3215; lower support plate-322; fourth hinge post-3221; a third hinge hole-3222; a second arc-shaped through groove-3223; a second abutment bump-3224; a first side connection plate-323; a shackle-330; a latch plate-331; fourth hinge through-hole-3311; a third abutment bump-3312; electromagnetic trip pushing part-3313; a second side connection plate-332; a hinged plate-333; semicircle pillar-3331; a latch-3332; double-gold pull rod-334; double-gold abutting matching block-3341; jumping button-340; a fifth hinge through hole-341; connecting rod connecting hole-342; a contact turret-350; a third hinge hole-351; moving contact mounting groove-352; a first torsion spring-360; energy-storing torsion spring-370; a second winding-371; a third action arm-372; fourth arm-373; a third winding-374; a second torsion spring-380;

a moving contact-400;

A fixed contact-500;

Indicating the rotation member-600; center post-610; a third side connection plate-620; a second indicator panel-630; an action bump-640; a resilient abutment arm-650; semi-cylindrical bumps-651;

Double-gold assembly-700;

electromagnetic release-800;

Arc extinguishing mechanism-900.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present utility model more apparent.

It should be noted that, in the embodiments of the present utility model, all the expressions "first" and "second" are used to distinguish two entities with the same name but different entities or different parameters, and it is noted that the "first" and "second" are only used for convenience of expression, and should not be construed as limiting the embodiments of the present utility model, and the following embodiments are not described one by one.

The terms of direction and position in the present utility model, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer only to the direction or position of the drawing. Accordingly, directional and positional terms are used to illustrate and understand the utility model and are not intended to limit the scope of the utility model.

A miniature circuit breaker, as shown in fig. 1 and 2, comprises a shell 100, a handle 200, an operating mechanism 300, a moving contact 400, a fixed contact 500, an indicating mechanism, a double-gold assembly 700, an electromagnetic release 800 and an arc extinguishing mechanism 900.

The handle 200 is hinged to the housing 100 and partially extends out of the housing 100 for manual opening and closing.

As shown in fig. 3, the operating mechanism 300 includes a U-shaped link 310, a lever bracket 320, a latch 330, a trip 340, and a contact turret 350, wherein the U-shaped link 310 is connected between the handle 200 and the latch 330, the lever bracket 320 is hinged to the housing 100 at the O-axis, the latch 330 is hinged to the lever bracket 320 at the a-axis, the trip 340 is hinged to the lever bracket 320 at the B-axis, the contact turret 350 is hinged to the housing 100 at the C-axis, and the lever bracket 320 rotates while pushing the contact turret 350 to rotate around the C-axis.

As shown in fig. 4, the inner walls of the side plates on both sides of the housing 100 are provided with a first hinge hole 111 at the O-axis and a second hinge hole 112 at the C-axis.

As shown in fig. 5, the lever bracket 320 has an upper bracket plate 321, a lower bracket plate 322, and a first side connecting plate 323 connected between one sides of the upper bracket plate 321 and the lower bracket plate 322, wherein a first hinge boss 3211 is formed on an O-axis, a second hinge boss 3212 is formed on an a-axis, a third hinge boss 3213 is formed on a B-axis, a first arc-shaped through slot 3214 is formed on a C-axis, a first abutting bump 3215 is formed on a lower end surface of the upper bracket plate 321 in a protruding manner, a fourth hinge boss 3221 is formed on the O-axis, a third hinge hole 3222 is formed on the a-axis, a second arc-shaped through slot 3223 is formed on the C-axis, and a second abutting bump 3224 is formed on a lower end surface of the lower bracket plate 322 in a protruding manner, and the first hinge boss 3211 and the fourth hinge boss 3221 are respectively inserted into the first hinge holes 111 on inner side plates on both side walls of the housing 100, so that the lever bracket 320 rotates around the O-axis.

As shown in fig. 6, the latch 330 has a latch plate 331 located above the upper bracket plate 321, a second side connection plate 332 connected to a lower end of one side of the latch plate 331, two hinge plates 333 connected to the second side connection plate 332 and separated from the latch plate 331 by a certain distance, a pair Jin Lagan 334 integrally formed on the latch plate 331, a fourth hinge through hole 3311 formed on the latch plate 331, a third abutting bump 3312, and an electromagnetic trip pushing portion 3313, wherein the fourth hinge through hole 3311 is located at the a axis for the second hinge post 3212 to pass through to enable the latch 330 to rotate around the a axis relative to the lever bracket 320, the electromagnetic trip pushing portion 3313 cooperates with the electromagnetic trip 800, the hinge plates 333 are located above the lower bracket plate 322 and are downwardly protruded to form two semicircular hinge posts 3331 having a certain elasticity, outer edges of the lower ends of the semicircular hinge posts 3331 are protruded to form a latch block 3332, the two semicircular hinge posts 3331 pass through the third hinge through hole 3222, the latch block 3332 is located below the lower bracket plate 322 to enable the hinge plates 333 to form a stable connection with the lower bracket plate 322, and the double-metal assembly 700 cooperates with the double-metal assembly Jin Lagan. The provision of two semicircular hinge posts 3331 may reduce the number of hinge parts.

In a common molded case circuit breaker, the double-metal pull rod 334 is generally a part which is arranged separately, two ends of the double-metal pull rod are respectively matched with the lock catch 330 and the double-metal assembly 700 to form the transmission of the tripping action of thermal protection, and in the embodiment, the double Jin Lagan 334 and the lock catch 330 are integrally formed, so that the number of parts is reduced, and the assembly efficiency is improved. Meanwhile, as shown in fig. 6, the protrusion on the side surface of the double-gold pull rod 334 of the present embodiment has three double-gold abutting matching blocks 3341 located at different positions, and the initial bending degree of the double-gold assembly 700 can be adjusted by matching the double-gold assembly 700 with the double-gold abutting matching blocks 3341 located at different positions.

As shown in fig. 7, the jump button 340 is provided with a fifth hinge through hole 341 and a connecting rod connecting hole 342, the third hinge protruding column 3213 penetrates through the jump button 340 to enable the jump button 340 to rotate around the B axis relative to the lever bracket 320, the handle 200 and the lock catch 330 are connected and driven through the U-shaped connecting rod 310, and one end of the U-shaped connecting rod 310 is inserted into the connecting rod connecting hole 342. The latch 330 and the trip 340 have a locked state and a tripped state that form an abutting engagement, and when abutting, a first abutting portion 335 on the latch 330 and a second abutting portion 343 on the trip 340 in the figure abut.

As shown in fig. 8, the contact rotating frame 350 is provided with a third hinge hole 351 disposed at the C-axis, and a moving contact mounting groove 352 adapted to a partial shape of one end of the moving contact 400 and used for fixedly mounting the moving contact 400, the contact rotating frame 350 is located between the upper support plate 321 and the lower support plate 322, the contact rotating frame 350 is hinged to the housing 100 by a hinge shaft C, and the hinge shaft C passes through the third hinge hole 351, and both ends of the hinge shaft C simultaneously pass through the first arc-shaped through groove 3223 and the second arc-shaped through groove 3223 and are inserted into the second hinge hole 112 on the inner wall of the housing 100. The third hinge hole 351 is provided in the moving contact mounting groove 352, and the moving contact 400 is positioned in the moving contact mounting groove 352 and passes through the moving contact 400 through the hinge shaft C to form a linkage fit between the moving contact 400 and the contact turret 350. The first and second arc-shaped through grooves 3223 and 3223 provide for rotation of the hinge shaft C within a certain angular range relative to the O-axis.

The lever bracket 320 and the lock catch 330 are provided with a first torsion spring 360 therebetween, the structure of which is shown in fig. 9, the first torsion spring 360 includes a first coil, a first acting arm and a second acting arm connected at two ends of the first coil, the second hinge post 3212 passes through the fourth hinge through hole 3311 and the first coil is sleeved outside the second hinge post 3212, and the first acting arm and the second acting arm are respectively in butt fit with the third butt joint protrusion 3312 and the hinge shaft C of the lock catch 330. The first torsion spring 360 is used to provide a return rotational force to the catch 330.

An energy storage torsion spring 370 is disposed between the lever bracket 320 and the contact turret 350, and the structure thereof is shown in fig. 10a or fig. 10 b. The energy-storing torsion spring 370 shown in fig. 10a includes a second coil 371, and a third acting arm 372 and a fourth acting arm 373 connected to both ends of the second coil 371, wherein the second coil 371 is sleeved outside the hinge axis C, and the third acting arm 372 and the fourth acting arm 373 are respectively in abutting engagement with a first abutment protrusion 3215 of the lever bracket 320 and the contact turret 350. The energy-storing torsion spring 370 shown in fig. 10b is substantially the same as that shown in fig. 10a, and also includes a second coil 371, a third acting arm 372 and a fourth acting arm 373 connected to both ends of the second coil 371, except that the fourth acting arm 373 has a U-shaped structure, and a third coil 374 is connected to the end of the fourth acting arm 373, and the second coil 371 and the third coil 374 are respectively sleeved outside the hinge shafts C at both ends of the contact turret 350. The energy storage torsion spring 370 is used for providing a rotation pre-tightening force for the moving contact 400.

The second torsion spring 380 is disposed between the lever bracket 320 and the inner wall of the side of the housing 100, as shown in fig. 11, and includes a fourth coil, a fifth acting arm and a sixth acting arm connected to two ends of the fourth coil, a circular boss 110 is disposed on the inner wall of the side plate of the side of the housing 100, a fifth abutment bump 113 is formed on one side of the circular boss 110, the fourth coil is sleeved outside the circular boss 110, and the fifth acting arm and the sixth acting arm respectively cooperate with the second abutment bump 3224 of the lever bracket 320 and the fifth abutment bump 113 of the housing 100 in an abutment manner. The second torsion spring 380 provides a rotational driving force for restoring the lever bracket 320, and compared with the structure of a conventional spring, the two ends of the torsion spring are clamped accurately, and no deviation occurs

When the circuit breaker is normally opened and closed, the trip button 340 is buckled with the lock catch 330, the handle 200 drives the lock catch 330 to rotate through the U-shaped connecting rod 310, then the trip button 340 and the lever bracket 320 rotate along with the lock catch, and then the lever bracket 320 drives the contact rotating frame 350 and the moving contact 400 to perform normal opening and closing actions along with the trip button 340 and the lever bracket 320. In this process, since the position of the hinge shaft C relative to the trip buckle 340 is not fixed at the opening and closing position, the torque of the first torsion spring 360 is changed at the opening and closing positions, and the acting force of the first torsion spring 360 is large at the opening and closing time, so that the slip buckle can be prevented, the acting force of the spring is small and the torque becomes light after the closing.

When a fault occurs, the jump button 340 is separated from the lock catch 330 and starts to rotate as the lock catch 330 is struck, and the lever bracket 320, the contact rotating frame 350 and the moving contact 400 rotate accordingly to form a trip brake.

Further, as shown in fig. 2 and 4, the indication mechanism of the present embodiment includes an indication window 120 disposed on a side wall of the housing 100, a first indication plate 130 formed to protrude inside the indication window 120, an indication hinge post 140 formed to protrude inside the first indication plate 130, and an indication rotating member 600 sleeved on the indication hinge post 140, as shown in fig. 12, the indication rotating member 600 includes a central post 610 having a hinge through hole 611, a second indication plate 630 connected to one side of the central post 610 through a third side connection plate 620, an action protrusion 640 on the other side of the central post 610, and elastic abutment arms 650 connected to the third side connection plate 620 and located on upper and lower sides of the second indication plate 630, wherein the central post 610 is sleeved outside the indication hinge post 140, a gap for inserting the first indication plate 130 is formed between the second indication plate 630 and the central post 610, and the indication rotating member 600 is rotatable about the indication hinge post 140, and has a second indication plate 630, as shown in fig. 13a, the first indication plate 130 blocks the fault indication plate 120, and the second indication plate 630 shows a normal indication plate 120, as shown in fig. 13 b.

The outer surfaces of the first indicator plate 130 and the second indicator plate 630 are different colors, in this embodiment, the first indicator plate 130 is integrally formed with the housing 100, the color of the first indicator plate is the same as that of the housing 100, and the second indicator plate 630 may be an injection molded part with different colors or may be coated with a coating on the outer surface only to form different colors. In this embodiment, the first indicator plate 130 and the second indicator plate 630 are arc plates centered on the central axis of the central column 610, so as to reduce space occupation.

The action protrusion 640 cooperates with the trip 340 and the lever bracket 320 for switching between a fault indication state and a normal indication state, specifically, in the normal indication state, the trip 340 abuts against the action protrusion 640 to keep the indication rotating member 600 at the position of the normal indication state shown in fig. 13b, and meanwhile, the action protrusion has an energy storage function formed by an elastic structure, when a fault occurs, the trip 340 is separated from the lock catch 330, the trip 340 rotates away from the action protrusion 640 to rotate the indication rotating member 600 to the position of the fault indication state shown in fig. 13a under the energy release function of the elastic structure, and when the handle driving operation mechanism 300 is rebuckled again at this time, the lever bracket 320 rotates to the rebuckled gate position and pushes the indication rotating member 600 to the position shown in fig. 13b, and the elastic structure stores energy again.

In this embodiment, the elastic structure is composed of elastic abutting arms 650 located on the upper and lower sides of the second indication board 630 and a sixth abutting bump 150 located on the inner wall of the housing 100, and in the normal indication state, the elastic abutting arms 650 and the sixth abutting bump 150 cooperate to form an energy storage function, so as to form an elastic driving force for rotating the indication rotating member 600 to the position where the fault indication state is located. The elastic structure can also adopt common elastic piece structures such as torsion springs, and the number of parts can be reduced by adopting the structure in the embodiment. Specifically, there is a slope or curved surface between the elastic abutment arm 650 and the sixth abutment bump 150, which forms a rotation pushing force on the indication rotator 600 when the elastic abutment arm 650 is pressed by the sixth abutment bump 150, and the slope or curved surface may be provided on the elastic abutment arm 650 and/or the sixth abutment bump 150. In the present embodiment, as shown in fig. 12, the end of the elastic abutment arm 650 is protruded to form a semi-cylindrical bump 651, and at the same time, a slope is formed on the sixth abutment bump 150, and when the elastic abutment arm 650 is pressed down by the sixth abutment bump 150, the semi-cylindrical bump 651 interacts with the slope on the sixth abutment bump 150 to form a sloped elastic force, which may form a component of the rotational driving force.

The foregoing disclosure is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims.

Claims (10)

1. The utility model provides a miniature circuit breaker, includes casing (100), handle (200), operating device (300), moving contact (400), stationary contact (500), indicating mechanism, its characterized in that:

The operating mechanism (300) is provided with a normal opening and closing state and a tripping and opening state;

The indicating mechanism comprises an indicating window (120) arranged on the side wall of the shell (100), a first indicating plate (130) formed by protruding at the inner side of the indicating window (120) and an indicating rotating piece (600);

The indicating rotary piece (600) comprises a central column (610) and a second indicating plate (630) positioned at one side of the central column (610) and connected through a third side connecting plate (620);

The central column (610) is hinged with the shell (100) to enable the indication rotating piece (600) to rotate around the central axis of the central column (610);

A gap for inserting the first indication plate (130) is formed between the second indication plate (630) and the central column (610), the indication rotating piece (600) rotates under the action of the operating mechanism (300) and is provided with a fault indication state that the second indication plate (630) blocks the first indication plate (130) to enable the corresponding operating mechanism (300) of the second indication plate (630) to be in a tripping and opening state in the indication window (120), and a normal indication state that the second indication plate (630) rotates out to enable the corresponding operating mechanism (300) of the first indication plate (130) to be in a normal opening and closing state in the indication window (120);

The outer surfaces of the first indicator plate (130) and the second indicator plate (630) are different colors.

2. The miniature circuit breaker of claim 1, wherein: the operating mechanism (300) comprises a U-shaped connecting rod (310), a lever bracket (320), a lock catch (330), a jump buckle (340) and a contact rotating frame (350), wherein the U-shaped connecting rod (310) is connected between a handle (200) and the lock catch (330), the lever bracket (320) is hinged with a shell (100) at an O axis, the lock catch (330) is hinged with the lever bracket (320) at an A axis, the jump buckle (340) is hinged with the lever bracket (320) at a B axis, the contact rotating frame (350) is hinged with the shell (100) at a C axis, and the lock catch (330) and the jump buckle (340) are in a locking state and a tripping state which form abutting fit and are separated;

The indicating rotation piece (600) comprises an action lug (640) positioned on one side of the central column (610);

in the locking state, the jump buckle (340) is abutted with the action lug (640) to enable the indication rotating piece (600) to be kept at the position of the normal indication state, and the jump buckle has an elastic structure to form an energy storage function;

When in a release state, under the action of the energy release of the elastic structure, the indication rotating piece (600) rotates to a position of a fault indication state, and the action lug (640) is positioned on a path of the lever bracket (320) rotating to a re-buckling gate position, so that the lever bracket (320) rotates to the re-buckling gate position, and simultaneously the indication rotating piece (600) is pushed to rotate to a position of a normal indication state, and the elastic structure stores energy again.

3. The miniature circuit breaker of claim 2, wherein: the elastic structure is composed of elastic abutting arms (650) positioned on the upper side and the lower side of the second indicating plate (630) and a sixth abutting lug (150) positioned on the inner wall of the shell (100), and in a normal indicating state, the elastic abutting arms (650) and the sixth abutting lug (150) are matched to form an energy storage function, and an elastic driving acting force for rotating the indicating rotating piece (600) to the position where the fault indicating state is located is formed.

4. The miniature circuit breaker of claim 2, wherein: the lever bracket (320) is provided with an upper bracket plate (321), a lower bracket plate (322) and a first side connecting plate (323) connected between one sides of the upper bracket plate (321) and the lower bracket plate (322), the lock catch (330) and the jump catch (340) are respectively hinged above the upper bracket plate (321), and the contact rotating frame (350) is rotatably arranged between the upper bracket plate (321) and the lower bracket plate (322).

5. The miniature circuit breaker of claim 4, wherein: the inner walls of the side plates at the two sides of the shell (100) are provided with a first hinge hole (111) positioned at the O axis and a second hinge hole (112) positioned at the C axis;

The upper end face of the upper support plate (321) forms a first hinging convex column (3211) at the O axis, a second hinging convex column (3212) at the A axis, a third hinging convex column (3213) at the B axis and a first arc-shaped through groove (3214) at the C axis, the lower end face of the lower support plate (322) forms a fourth hinging convex column (3221) at the O axis and a second arc-shaped through groove (3223) at the C axis;

The lock catch (330) is provided with a lock catch plate (331) positioned above the upper support plate (321), a fourth hinging through hole (3311) and a third abutting projection (3312) are formed on the lock catch plate (331), the fourth hinging through hole (3311) is positioned at the A axis for the second hinging convex column (3212) to penetrate through so that the lock catch (330) rotates around the A axis relative to the lever support (320);

The jump button (340) is provided with a fifth hinge through hole (341) and a connecting rod connecting hole (342), the third hinge convex column (3213) penetrates through the jump button (340) to enable the jump button (340) to rotate around the B axis relative to the lever bracket (320), the handle (200) and the lock catch (330) are connected and driven through the U-shaped connecting rod (310), and one end of the U-shaped connecting rod (310) is inserted into the connecting rod connecting hole (342);

The contact rotating frame (350) is provided with a third hinge hole (351) arranged at the C-axis and a moving contact mounting groove (352) which is matched with one end of the moving contact (400) in a local shape and is used for fixedly mounting the moving contact (400), the contact rotating frame (350) is hinged with the shell (100) through a hinge shaft C, the hinge shaft C passes through the third hinge hole (351) and simultaneously passes through a first arc-shaped through groove (3214) and a second arc-shaped through groove (3223) at two ends of the hinge shaft C to be inserted into a second hinge hole (112) on the inner wall of the shell (100); the third hinge hole (351) is formed in the moving contact mounting groove (352), and the moving contact (400) is limited in the moving contact mounting groove (352) and penetrates through the moving contact (400) through the hinge shaft C to enable the moving contact (400) to form linkage fit with the contact rotating frame (350).

6. The miniature circuit breaker of claim 5, wherein: the lock catch (330) is provided with a second side connecting plate (332) connected to the lower end of one side of the lock catch plate (331), and a hinged plate (333) which is connected to the second side connecting plate (332) and is separated from the lock catch plate (331) by a certain distance; a third hinge through hole (3222) is formed on the lower end surface of the lower support plate (322) at the A axis; the hinge plates (333) are located above the lower support plate (322) and are downwards protruded to form two semicircular hinge columns (3331) with certain elasticity, clamping blocks (3332) are formed by protruding outer edges of the lower ends of the semicircular hinge columns (3331), the two semicircular hinge columns (3331) penetrate through the third hinge through holes (3222) and the clamping blocks (3332) are located below the lower support plate (322).

7. The miniature circuit breaker of claim 5, wherein: the lock catch (330) is provided with a double Jin Lagan (334) which is integrally formed on the lock catch plate (331), and the double Jin Lagan (334) is matched with the double-gold assembly (700); the double Jin Lagan (334) has at least two double-gold abutting-fit blocks (3341) located at different positions on the side surface, and the double-gold assembly (700) can be abutted-fit with any one of the double-gold abutting-fit blocks (3341).

8. The miniature circuit breaker of claim 5, wherein: a first torsion spring (360) is arranged between the lever bracket (320) and the lock catch (330), and two ends of the first torsion spring (360) are respectively in butt fit with a third butt joint projection (3312) of the lock catch (330) and the hinge shaft C.

9. The miniature circuit breaker of claim 5, wherein: a second torsion spring (380) is arranged between the lever bracket (320) and the inner wall of one side of the shell (100); the second torsion spring (380) comprises a fourth winding, and a fifth action arm and a sixth action arm which are connected to two ends of the fourth winding, a round boss (110) is arranged on the inner wall of a side plate on one side of the shell (100), a fifth butt convex block (113) is formed on one side of the round boss (110), a second butt convex block (3224) is formed on the lower end face of the lower support plate (322) in a protruding mode, the fourth winding is sleeved outside the round boss (110), and the fifth action arm and the sixth action arm are respectively in butt fit with the second butt convex block (3224) of the lever support (320) and the fifth butt convex block (113) of the shell (100).

10. The miniature circuit breaker of claim 1, wherein: the first indicator plate (130) and the second indicator plate (630) are arc plates taking the central shaft of the central column (610) as the center of a circle.