CN112967910A - Operating mechanism of circuit breaker - Google Patents

Abstract

The invention relates to the field of low-voltage electrical appliances, in particular to an operating mechanism of a circuit breaker, which comprises a handle, a first connecting rod, a secondary connecting rod, a jump buckle, a movable contact piece, a lock catch and an arc-shaped chute, wherein the handle, the first connecting rod, the secondary connecting rod, the jump buckle, the movable contact piece, the lock catch and the arc-shaped chute are arranged in a shell of the; the movable contact piece is arranged on the first rotating shaft in a rotating mode through a kidney-shaped hole formed in the middle of the movable contact piece, and the other end of the movable contact piece is provided with a movable contact; the operating mechanism of the circuit breaker has the advantages of simple structure, convenience in assembly, compact layout and assembly space saving.

Description

Operating mechanism of circuit breaker

Technical Field

The invention relates to the field of low-voltage electrical appliances, in particular to an operating mechanism of a circuit breaker.

Background

The existing circuit breaker is complex in structure and process, automatic production is difficult to realize, especially an operating mechanism of the existing circuit breaker is large in occupied space, and the requirements of intelligent and miniaturized development trends of the circuit breaker cannot be met.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an operating mechanism of a circuit breaker, which has the advantages of simple structure, convenience in assembly, compact layout and assembly space saving.

In order to achieve the purpose, the invention adopts the following technical scheme:

an operating mechanism of a circuit breaker comprises a handle 1, a first connecting rod 2, a second connecting rod 3, a jump buckle 4, a movable contact piece 5, a lock catch 7 and an arc-shaped sliding chute 8, wherein the handle 1, the first connecting rod 2, the second connecting rod 3, the jump buckle 4, the movable contact piece 5 and the lock catch 7 are arranged in a shell H of the circuit breaker;

the handle 1 is arranged on the shell H in a pivoting mode, the first front end 20 of the head connecting rod 2 is connected with one end of the handle 1 in a rotating mode, the first rear end 21 of the head connecting rod 2 is connected with the middle of the jump buckle 4 in a rotating mode and is in sliding fit with the sliding groove 8, one end of the jump buckle 4 is connected with one end of the secondary connecting rod 3 in a rotating mode, the jump buckle matching end 410 of the jump buckle 4 is used for being matched with the buckle matching end 700 of one end of the buckle 7 in a locking mode, the middle of the buckle 7 is arranged on the shell H in a pivoting mode, the other end of the secondary connecting rod 3 is connected with one end of the movable contact piece 5 in a rotating mode, the movable contact piece 5 is arranged on the first rotating shaft 5rs in a.

Preferably, the sliding groove 8 is arc-shaped, and the center of the sliding groove 8 is located on the rotation axis of the lock catch 7.

Preferably, when the circuit breaker is in a switching-off state, the tripping mating end 410 is arranged opposite to the latch mating end 700, a mating gap G is formed between the tripping mating end 410 and the latch mating end 700, and the tripping mating end 410 is in latch mating with the latch mating end 700 when the handle 1 drives the operating mechanism to switch on.

Preferably, the sliding groove 8 is arranged on the housing H and is of an integral structure with the housing H, and the first rear end 21 passes through the jump buckle 4 and is inserted into the sliding groove 8 to be in sliding fit with the sliding groove.

Preferably, the handle 1 rotates and drives the first rear end 21 to move along the sliding slot 8, the first rear end 21 drives the trip buckle 4 to rotate, so that the trip buckle mating end 410 is in lock buckle mating end 700, and simultaneously the secondary link 3, the trip buckle 4, the movable contact piece 5 and the lock buckle 7 form a four-link mechanism which is relatively static and synchronously rotates until the movable contact 52 is initially contacted with the stationary contact 520 of the circuit breaker, the handle 1 continues to rotate to the switching-on position, the movable contact piece 5 is driven to swing by taking the stationary contact 520 as a fulcrum, the kidney-shaped hole 53 moves relative to the first rotating shaft 5rs, and the circuit breaker enters the switching-on state.

Preferably, the circuit breaker further comprises a first return spring 90 for driving the movable contact piece 5 to return, and a second return spring 92 for driving the latch 7 to return, wherein the other end of the latch 7 is used for being in driving fit with a protection mechanism of the circuit breaker;

when a fault occurs, the protection mechanism drives the lock catch 7 to rotate, so that the lock catch matching end 700 is disengaged from the lock catch matching end 410, the first reset spring 90 drives the movable contact piece 5 to rotate, the movable contact 52 is disconnected from the static contact 520, meanwhile, the movable contact piece 5 drives the trip catch 4 to rotate by taking the first rear end 21 as a shaft through the secondary connecting rod 3, the circuit breaker enters a trip state, and after the circuit breaker trips, the second reset spring 92 drives the lock catch 7 to rotate and reset.

Preferably, the moving contact piece 5 includes a moving contact connection portion 50 and a moving contact portion 51 respectively disposed at two ends thereof, one end of the moving contact connection portion 50 is rotatably connected to the secondary link 3, the other end thereof is provided with a kidney-shaped hole 53 and is connected to one end of the moving contact portion 51 in a bent manner, the other end of the moving contact portion 51 is provided with a moving contact 52, one end of the first return spring 90 is connected to the housing H, and the other end thereof is connected to the moving contact connection portion 50.

Preferably, the protection mechanism comprises a short-circuit protection mechanism 9 and an overload protection mechanism 6, the latch 7 is of a Y-shaped structure and comprises a matching arm 70, a short-circuit driving arm 71 in driving fit with the short-circuit protection mechanism 9 and an overload driving arm 72 in driving fit with the overload protection mechanism 6, one end of the matching arm 70 is provided with a latch matching end 700, and the other end of the matching arm is respectively connected with the short-circuit driving arm 71 and the overload driving arm 72 in a bending way; the engagement arm 70 is pivotally disposed on the housing H.

Preferably, the trip buckle 4 further comprises a switching-off indicating surface and a switching-on indicating surface which are arranged on one side of the trip buckle, and an indicating hole matched with the switching-off indicating surface and the switching-on indicating surface is formed in the shell H; when the circuit breaker is switched on, the handle 1 rotates and drives the four-bar mechanism to rotate through the head connecting rod 2, so that a switching-on indicating surface is opposite to the indicating hole; when the circuit breaker trips, the movable contact piece 5 drives the tripping buckle 4 to rotate through the secondary connecting rod 3, so that the brake-separating indicating surface is opposite to the indicating hole.

Preferably, the operating mechanism of the circuit breaker further comprises a moving contact limiting table 7a for limiting the rotating angle of the moving contact piece 5 when the moving contact 52 and the fixed contact 520 are disconnected; the operating mechanism of the circuit breaker further comprises a lock catch positioning structure, the second reset spring 92 drives the lock catch 7 to rotate and reset, so that the lock catch 7 abuts against the lock catch positioning structure, and the moving contact limiting table 7a and the lock catch positioning structure are both arranged on the shell H.

Preferably, the trip buckle mating end 410 of the trip buckle 4 is located above the buckle mating end 700 of the buckle 7 during opening and is provided with a mating gap G; when the switch is switched on, the handle 1 drives the jump buckle 4 to rotate through the head connecting rod 2, so that the jump buckle matching end 410 moves towards the lock buckle matching end 700 to eliminate the matching gap G, and the jump buckle 4 is in lock buckle matching with the lock buckle 7.

Compared with the existing circuit breaker operating mechanism, the operating mechanism of the circuit breaker has the advantages that the omitted rotating plate is fewer in parts, the connection relation of all components of the operating mechanism is simple, the automatic assembly is facilitated, the layout is compact, and the assembly space of the shell is saved. In addition, a fit clearance is arranged between the jump buckle mating end and the lock catch mating end, and the reliability of the jump buckle and the lock catch resetting is ensured.

Drawings

Fig. 1 is a schematic structural view of a second embodiment of an operating mechanism of a circuit breaker according to the present invention;

fig. 2 is a schematic structural diagram of a first embodiment of an operating mechanism of a circuit breaker according to the present invention, in which the circuit breaker is in a tripping state, and a fit gap is provided between a tripping mating end of a tripping buckle and a locking buckle mating end of a locking buckle;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2 of the present invention;

fig. 4 is a schematic structural view of a first embodiment of an operating mechanism of a circuit breaker according to the present invention, wherein a jumper mating end of a jumper is snap-fitted to a latch mating end of a latch by pulling a handle;

FIG. 5 is an enlarged schematic view of portion B of FIG. 4 in accordance with the present invention;

fig. 6 is a schematic structural view of a first embodiment of the operating mechanism of the circuit breaker of the present invention, showing at least the state of the operating mechanism when the movable contact is initially in contact with the stationary contact.

Fig. 7 is a schematic structural view of a first embodiment of the operating mechanism of the circuit breaker according to the present invention, the circuit breaker being in a closed state with the movable contact member being offset with respect to the first axis of rotation.

Fig. 8 is a schematic structural view of a first embodiment of an operating mechanism of a circuit breaker according to the present invention, in which the circuit breaker is in a trip state and a trip engaging end of a trip buckle is disengaged from a latch engaging end of a latch.

Fig. 9 is a schematic structural view of a specific example of a first embodiment of the operating mechanism of the circuit breaker of the present invention, the circuit breaker being in a closing state, showing at least the structure of the trip, the latch, and the movable contact piece;

FIG. 10 is a schematic view of the construction of the head link of the present invention;

FIG. 11 is a schematic view of the construction of the secondary linkage of the present invention;

figure 12 is a schematic view of the structure of the movable contact piece of the present invention;

fig. 13 is a schematic structural view of the base of the housing H of the present invention.

Detailed Description

The following further describes a specific embodiment of the operating mechanism of the circuit breaker according to the present invention, in conjunction with the embodiments shown in fig. 1-13. The operating mechanism of the circuit breaker of the present invention is not limited to the description of the following embodiments.

The circuit breaker comprises an operating mechanism arranged in a shell H of the circuit breaker, wherein the operating mechanism comprises a handle 1, a first connecting rod 2, a secondary connecting rod 3, a jump buckle 4, a movable contact piece 5, a lock catch 7 and an arc-shaped sliding groove 8;

the middle of the handle 1 is pivotally arranged on a shell H, a first front end 20 at one end of a head connecting rod 2 is rotatably connected with one end of the handle 1, a first rear end 21 at the other end is rotatably connected with the middle of a jump buckle 4 and is in sliding fit with a sliding groove 8, one end of the jump buckle 4 is rotatably connected with one end of a secondary connecting rod 3, a jump buckle matching end 410 at the other end is used for being in locking fit with a lock buckle matching end 700 at one end of a lock buckle 7, the middle of the lock buckle 7 is pivotally arranged on the shell H, the other end is used for being in driving fit with a protection mechanism of a circuit breaker, the other end of the secondary connecting rod 3 is rotatably connected with one end of a movable contact piece 5, the other end of the movable contact piece 5 is provided with a movable contact 52 which is matched with a fixed contact 520 on the shell H;

during closing, the handle 1 rotates and drives the first rear end 21 to slide along the sliding groove 8, the first rear end 21 drives the trip buckle 4 to rotate, so that the trip buckle matching end 41 is in lock buckle matching with the lock buckle matching end 700, meanwhile, the secondary connecting rod 3, the trip buckle 4, the movable contact piece 5 and the lock buckle 7 form a four-bar mechanism which is static and rotates synchronously relative to each other, until the movable contact 52 is initially contacted with the fixed contact 520, the handle 1 continues to rotate to a closing position, the movable contact piece 5 is driven to swing by taking the fixed contact 520 as a fulcrum, the waist-shaped hole 53 moves relative to the first rotating shaft 5rs, and the circuit breaker enters a closing state.

Compared with the operating mechanism of the existing circuit breaker, the operating mechanism of the circuit breaker omits a rotating plate, has fewer parts, has simple connection relation of all components of the operating mechanism, is convenient for automatic assembly, has compact layout and saves the assembly space of the shell.

Preferably, as shown in fig. 2 and 3, when the circuit breaker is in the open state, the jump ring mating end 410 is disposed opposite to the latch mating end 700, and a mating gap G is provided between the jump ring mating end 410 and the latch mating end 700. After the circuit breaker trips, the trip buckle 4 can enter the state shown in fig. 8, when the trip handle 1 drives the trip buckle 4 to reset, if no fit clearance exists, the trip buckle matching end 410 cannot reset due to the blocking of the matching arm 70 of the lock catch 7 due to the effects of part tolerance, deformation, external force and the like, the circuit breaker cannot be closed again, the reliability of the circuit breaker is reduced, and therefore the reliability of the reset of the trip buckle 4 and the lock catch 7 is ensured due to the fit clearance G. It should point out, fit clearance G should not set up too big, is unfavorable for practicing thrift circuit breaker internal assembly space, should not also the undersize, otherwise can make the condition that can't reset appear jumping to detain 4. Preferably, the width of the fit clearance is 1mm-5 mm.

Preferably, as shown in fig. 1, 2, 4, 6-8, the middle of the latch 7 is pivotally disposed on the housing H via the first rotating shaft 5 rs. The lock catch 7 and the movable contact piece 5 are coaxially assembled and coaxially rotate, so that the size of the operating mechanism is further reduced, and the assembly space in the shell is saved. Of course, the middle of the lock catch 7 may also be pivotally disposed on the housing H through the second rotating shaft 7rs, and the second rotating shaft 7rs is fixed on the housing H and located at one side of the first rotating shaft 5 rs.

Preferably, the sliding groove 8 is arc-shaped, and the circle center of the sliding groove 8 is located on the rotation axis of the lock catch 7, so that transmission matching is facilitated, the size of the operating mechanism is further reduced, and the assembly space in the shell is saved.

Preferably, a first return spring 90 for driving the movable contact piece 5 to return and a second return spring 92 for driving the latch 7 to return are further included, the second return spring 92 is respectively connected with the shell H and the latch 7, the protection mechanisms comprise a short-circuit protection mechanism 9 and an overload protection mechanism 6, and of course, other functional protection mechanisms can also be included. As shown in fig. 8 and 9, when a short-circuit fault or an overload fault occurs, the short-circuit protection mechanism 9 or the overload protection mechanism 6 drives the latch 7 to rotate, so that the latch mating end 700 is disengaged from the latch mating end 410, the first return spring 90 drives the movable contact piece 5 to rotate, the movable contact 52 is disconnected from the stationary contact 520, meanwhile, the movable contact piece 5 drives the trip 4 to rotate around the first rear end 21 through the secondary link 3, the circuit breaker enters a trip state, and after the circuit breaker trips, the second return spring 92 drives the latch 7 to rotate and reset.

Preferably, as shown in fig. 13, the sliding groove 8 is disposed on the housing H and is an integral structure with the housing H, and the first rear end 21 is slidably disposed in the sliding groove 8 through the jump buckle 4. It should be noted that there is another matching manner among the first rear end 21, the jump buckle 4 and the sliding slot 8, that is, the first rear end 21 is a rod-shaped structure, one end of which is rotatably connected with the jump buckle 4, and the other end of which is slidably disposed in the sliding slot 8.

As shown in fig. 2 to 12, there is a first embodiment of the operating mechanism of the circuit breaker of the present invention.

As shown in fig. 2, 4, 6, and 7-9, the circuit breaker of the present invention includes an operating mechanism disposed in a housing H of the circuit breaker, wherein the operating mechanism includes a handle 1, a first connecting rod 2, a second connecting rod 3, a trip 4, a movable contact piece 5, a latch 7, and an arc-shaped chute 8, and a first return spring 90, a second return spring 92, and a first rotating shaft 5rs are further disposed in the housing H of the circuit breaker. The middle part of the handle 1 is pivotally arranged on a shell H, a first front end 20 at one end of a head connecting rod 2 is rotationally connected with one end of the handle 1, a first rear end 21 at the other end is rotationally connected with the middle part of a jump buckle 4 and is slidably arranged in a chute 8, one end of the jump buckle 4 is rotationally connected with one end of a secondary connecting rod 3, a jump buckle matching end 410 at the other end is matched with a buckle matching end 700 at one end of a buckle 7, the middle part of the buckle 7 is pivotally arranged on the shell H, the other end is respectively in driving fit with a short-circuit protection mechanism 9 and an overload protection mechanism 6 of the circuit breaker, the other end of the secondary connecting rod 3 is rotationally connected with one end of a movable contact piece 5, the other end of the movable contact piece 5 is provided with a movable contact 52 matched with a fixed contact 520 fixed on the shell H, the movable contact piece 5 is rotationally arranged on a first rotating shaft 5rs through; the two ends of the first return spring 90 are respectively connected with the shell H and the movable contact piece 5; two ends of the second return spring 92 are respectively connected with the shell H and the lock catch 7; the center of the sliding groove 8 is positioned on the rotating axis of the lock catch 7. Further, as shown in fig. 2 and 3, when the circuit breaker is in the open state, the jump buckle mating end 410 and the latch mating end 700 are disposed opposite to each other, and a mating gap G is provided between the jump buckle mating end 410 and the latch mating end 700. Further, as shown in fig. 3, the width of the fitting gap is L.

Preferably, as shown in fig. 2, the handle 1 includes an operating arm 10 and a transmission arm 11 connected in a bent manner, a joint of the operating arm 10 and the transmission arm 11 is pivotally disposed on the housing H, a free end of the operating arm 10 protrudes out of the housing H for operation by a user, and a free end of the transmission arm 11 is rotatably connected to a first front end 20 of the head link 2. Further, as shown in fig. 2, the included angle between the operating arm 10 and the driving arm 11 is an acute angle.

Preferably, as shown in fig. 13, the sliding groove 8 is disposed on the housing H and is of an integral structure with the housing H, the first rear end 21 passes through the jump buckle 4 and is inserted into the sliding groove 8 to be in sliding fit with the sliding groove 8, the sliding groove 8 is of an arc shape, and a center of the sliding groove 8 is located on a rotation axis of the lock catch 7.

Preferably, the circuit breaker further comprises a moving contact limiting table 7a for limiting the rotation angle of the moving contact piece 5 when the moving contact 53 and the fixed contact 520 are disconnected; the circuit breaker further comprises a latch positioning structure, and when the second return spring 92 drives the latch 7 to rotate and return, the latch 7 abuts against the latch positioning structure. Furthermore, the moving contact limiting table 7a and the lock catch positioning structure are both arranged on the shell H.

Specifically, as shown in the direction of fig. 2, the middle of the handle 1 is pivotally disposed on the housing H, the free end of the operating arm 10 protrudes outside the housing H for operation by the user, the free end of the driving arm 11 is rotatably connected with the left end of the head link 2, the first rear end 21 of the right end of the head link 2 is rotatably connected with the middle of the jump buckle 4, the first rear end 21 passes through the jump buckle 4 and is inserted into the chute 8 to be slidably engaged with the chute 8, the center of the chute 8 is located on the axis of the first rotating shaft 5rs, the right end of the jump buckle 4 is rotatably connected with the left end of the secondary link 3, the jump buckle mating end 410 of the right end is engaged with the buckle mating end 700 of the upper end of the buckle 7, the middle of the buckle 7 is pivotally disposed on the housing H through the first rotating shaft 5rs, the lower end is respectively in driving engagement with the short-circuit protection mechanism 9 and the overload protection mechanism 6, the left end of the secondary link 3 is rotatably connected with the upper end of, the movable contact piece 5 is rotatably arranged on a first rotating shaft 5rs through a waist-shaped hole 53 (not shown in the figure) arranged in the middle of the movable contact piece, and the first rotating shaft 5rs is fixed on the shell H; the first return spring 90 is disposed on the right side of the movable contact piece 5, and has one end connected to the portion of the movable contact piece 5 located above the kidney-shaped hole 53 and the other end connected to the housing H (not shown in the figure); the second return spring 92 (not shown) provides a force to the latch 7 to rotate clockwise, and drives the latch 7 to rotate and return after the circuit breaker is tripped, so that the latch 7 abuts against the latch positioning structure. Further, as shown in the direction of fig. 2, the moving contact limiting table 7a is disposed on the right side of the moving contact piece 5, and when the circuit breaker is in the open state, the moving contact portion 51 of the moving contact piece 5 abuts against the moving contact limiting table 7 a. Further, as shown in the direction of fig. 2, the short-circuit protection mechanism 9 is disposed below the handle 1 and on the left side of the latch 7, preferably an electromagnetic release; the overload protection mechanism 6 is arranged on the right side of the latch 7, preferably as a bimetal.

The operation of the operating mechanism of the present invention will be described with reference to fig. 2 to 8.

As shown in fig. 2, the circuit breaker is in an open state, and at this time, the handle 1 is in an open position O (specifically, the operating arm 10 of the handle 1 stops at the open position O), the trip mating end 410 of the trip 4 is located above the latch mating end 700 of the latch 7, and the two are arranged oppositely, and a mating gap G is provided between the two; when the switch is closed, the handle 1 is stirred to rotate clockwise, firstly the handle 1 drives the trip buckle 4 to rotate anticlockwise through the head connecting rod 2 (at this time, the trip buckle 4 rotates by taking the first rear end 21 as an axis, the rotation amplitude is small), the trip buckle matching end 410 moves towards the buckle matching end 700 (so as to eliminate the matching gap G), the two buckles are matched (as shown in the figure 4-5), at this time, the trip buckle 4, the secondary connecting rod 3, the movable contact piece 5 and the buckle 7 form a four-bar mechanism which is static and rotates synchronously relative to each other, the handle 1 is continuously stirred to rotate clockwise, the four-bar mechanism is driven to rotate clockwise around a rotating shaft of the buckle 7 until the movable contact 52 at the lower end of the movable contact piece 5 is initially contacted with the fixed contact 520 (as shown in the figure 6, at this time, the movable contact 52 and the fixed contact 520 are just contacted with each other), the handle 1 is further stirred to rotate clockwise, and the movable contact piece 5, at the same time, the slotted hole 53 moves relative to the first rotating shaft 5rs (preferably, the slotted hole 53 translates relative to the first rotating shaft 5rs), so that the first return spring 90 is further compressed, and the over-travel force (i.e., the acting force for keeping the movable contact 52 and the fixed contact 520 in reliable contact) provided by the first return spring 90 is obtained until the handle 1 reaches the closed position C (specifically, as shown in fig. 7, the operating arm 10 of the handle 1 stops at the closing position C), and at this time, the four-bar mechanism is in a force balance state, so that the movable contact 52 and the fixed contact 520 are kept in a closed state, and the circuit breaker enters a closing state. As shown in fig. 8, when a short-circuit fault or an overload fault occurs, the short-circuit protection mechanism 9 or the overload protection mechanism 6 can drive the latch 7 to rotate counterclockwise, so that the latch mating end 700 is disengaged from the latch mating end 410, the first return spring 90 drives the movable contact piece 5 to rotate counterclockwise, the movable contact piece 5 drives the trip 4 to rotate counterclockwise around the first rear end 21 of the first connecting rod 2 through the second connecting rod 3, the movable contact 52 and the stationary contact 520 are disconnected, then the second return spring 92 drives the latch 7 to rotate clockwise to reset, the handle 1 is shifted in the opening direction, the handle 1 drives the trip 4 to rotate clockwise around the left end of the second connecting rod 3 through the first connecting rod 2 to reset, and the circuit breaker enters the opening state. Preferably, as shown in fig. 8 and 2, the circuit breaker operating mechanism of the present invention further includes a handle return spring, when the trip buckle 4 is disengaged from the latch 7, the second return spring 92 drives the latch 7 to rotate clockwise to return, and at the same time, the head link 2 no longer applies an acting force to the handle 1, so that the handle 1 rotates to the open position O under the action of the handle return spring (the action is slow relative to the action of the moving contact piece 5), and pulls the trip buckle 4 to rotate clockwise to return, and when the trip buckle mating end 410 of the trip buckle 4 rotates over the latch mating end 700 of the latch 7, a mating gap between the two occurs again.

Preferably, the trip buckle 4 further comprises a switching-off indicating surface and a switching-on indicating surface which are arranged on one side of the trip buckle, and an indicating hole matched with the switching-off indicating surface and the switching-on indicating surface is formed in the shell H; when the circuit breaker is switched on, the handle 1 rotates and drives the four-bar mechanism to rotate through the head connecting rod 2, so that a switching-on indicating surface is opposite to the indicating hole; when the circuit breaker trips, the movable contact piece 5 drives the tripping buckle 4 to rotate through the secondary connecting rod 3, so that the brake-separating indicating surface is opposite to the indicating hole. Specifically, as shown in fig. 2, when the circuit breaker is switched on, the four-bar linkage mechanism rotates clockwise to make the switching-on indicating surface opposite to the indicating hole, and when the circuit breaker trips, the trip buckle 4 rotates counterclockwise around the first rear end 21, and the switching-off indicating surface is opposite to the indicating hole.

Preferably, as shown in fig. 9, is an embodiment of the lock catch 7.

The lock catch 7 is of a Y-shaped structure and comprises a matching arm 70, a short circuit driving arm 71 in driving fit with the short circuit protection mechanism 9 and an overload driving arm 72 in driving fit with the overload protection mechanism 6, wherein one end of the matching arm 70 is provided with a lock catch matching end 700, and the other end of the matching arm is respectively connected with the short circuit driving arm 71 and the overload driving arm 72 in a bending way; the engagement arm 70 is pivotally provided on the housing H by a first rotation shaft 5 rs. Further, as shown in fig. 9, a locking shaft hole is formed in the middle of the matching arm 70, and the locking catch 7 is rotatably disposed on the first rotating shaft 5rs through the locking shaft hole. Further, as shown in fig. 9, the latch 7 further includes a latch positioning portion, the latch positioning portion is disposed at the free end of the engaging arm 70 and located at the side of the latch engaging end 700, and the second return spring 92 drives the latch 7 to rotate and return, so that the latch positioning portion abuts against the side wall (serving as a latch positioning structure) of the sliding chute 8.

As shown in fig. 9 and 12, is one embodiment of the movable contact member 5.

The moving contact piece 5 is of a V-shaped structure and comprises a moving contact connecting part 50 and a moving contact part 51 which are connected in a bending mode, a kidney-shaped hole 53 is formed in one end, connected with the moving contact part 51, of the moving contact connecting part 50, the other end of the moving contact connecting part 50 is connected with a moving contact connecting hole 55 in a rotating mode through the secondary connecting rod 3, and the moving contact 52 is arranged at the free end of the moving contact part 51. Further, as shown in fig. 12, one side of the movable contact connecting portion 50 is deformed to be provided with a spring limit protrusion 54. Further, the movable contact piece 5 further includes a protrusion structure 56, and the protrusion structure 56 is disposed at a side of a connection portion of the movable contact connecting portion 50 and the movable contact contacting portion 51, and extends toward the latch 7.

Specifically, as shown in fig. 12, a moving contact connection hole 55 is formed in the upper end of the moving contact connection portion 50, the lower end of the moving contact connection portion is connected to the upper end of the moving contact portion 51 in a bending manner and is provided with a kidney-shaped hole 53, a spring limiting protrusion 54 is arranged on the right side edge of the moving contact connection portion 50, a moving contact 52 is arranged on the left side of the lower end of the moving contact portion 51, and a protrusion structure 56 is arranged on the left side of the moving contact piece 5 and located below the kidney.

Preferably, as shown in fig. 9, a spring limiting groove 90a is formed on the housing H, one end of the first return spring 90 is sleeved on the spring limiting protrusion 54, and the other end is disposed in the spring limiting groove 90.

Preferably, as shown in fig. 10 and 11, the primary link 2 and the secondary link 3 are both U-shaped structures; the head connecting rod 2 comprises a first connecting part 23, a first front end 20 and a first rear end 21, the first front end 20 and the first rear end are respectively connected with two ends of the first connecting part 23 in a bending way, and the first rear end 21 is longer than the first front end 20; the secondary connecting rod 3 comprises a second connecting part 33, a second front end 30 and a second rear end 31, the second front end 30 and the second rear end 31 are respectively connected with two ends of the second connecting part 33 in a bending mode, and the first rear end 31 is longer than the first front end 30.

As shown in fig. 9 and 13, there is a specific example of the first embodiment of the operating mechanism of the circuit breaker of the present invention.

As shown in fig. 9, the housing H includes a base and a cover, the handle 1 is pivotally disposed at the upper end of the housing H, the operating arm 10 at one end of the handle 1 protrudes outside the housing H for operation by a user, the jump buckle 4, the latch 7, the movable contact piece 5, and the first return spring 9 are all located at the right side of the handle 1, the jump buckle 4 is located above the latch 7 and the movable contact piece 5 and located between the upper end of the latch 7 and the upper end of the movable contact piece 5, the sliding groove 8 (shown in fig. 13) is disposed on the base and located at one side of the jump buckle 4, the movable contact piece 5 and the latch 7 are sequentially stacked between the base and the cover and are both pivotally disposed on the base through the first rotating shaft 5rs, the first return spring 9 is disposed at the right side of the movable contact piece 5, the left end is connected to the movable contact piece 5, and the right end is connected to the housing; the first front end 20 and the first rear end 21 of the first connecting rod 2 are respectively inserted into the middle parts of the handle 1 and the jump buckle 4 from the thickness direction of the shell H, and the two ends of the secondary connecting rod 3 are respectively inserted into the right end of the jump buckle 4 and the upper end of the movable contact piece 5 from the thickness direction of the shell H. Further, the moving contact piece 5 is made of sheet metal, and the thickness of the latch 7 overlapped with the moving contact piece 5 is less than 5.5 mm. Further, as shown in fig. 9, the first front end 20 and the first rear end 21 of the first link 2 are inserted into the middle of the handle 1 and the jump ring 4 respectively from the cover, and the two ends of the second link 3 are inserted into the right end of the jump ring 4 and the upper end of the movable contact member 5 respectively from the cover.

The operating mechanism of the circuit breaker has simple matching structure among all components, reasonable and concise structural hierarchy and convenient mechanical mass production.

As shown in fig. 1, a second embodiment of the operating mechanism of the circuit breaker of the present invention is shown.

The operating mechanism of the circuit breaker of the present embodiment differs from the operating mechanism of the circuit breaker of the first embodiment in that: the lock catch 7 is pivotally arranged on the shell through a second rotating shaft 7rs, and the circle center of the sliding groove 8 is located on the axis of the second rotating shaft 7 rs.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (11)

1. An operating mechanism of a circuit breaker is characterized by comprising a handle (1), a first connecting rod (2), a secondary connecting rod (3), a jump buckle (4), a movable contact piece (5), a lock catch (7) and an arc-shaped sliding groove (8), wherein the handle (1), the first connecting rod, the secondary connecting rod, the jump buckle (4), the movable contact piece and the arc-shaped sliding groove are arranged in a shell (H) of the circuit breaker;

the handle (1) is arranged on the shell (H) in a pivoting mode, a first front end (20) of the head connecting rod (2) is connected with one end of the handle (1) in a rotating mode, a first rear end (21) of the head connecting rod (2) is connected with the middle of the jump buckle (4) in a rotating mode and is in sliding fit with the sliding groove (8), one end of the jump buckle (4) is connected with one end of the secondary connecting rod (3) in a rotating mode, a jump buckle matching end (410) of the jump buckle (4) is used for being matched with a buckle matching end (700) of one end of the buckle (7) in a locking mode, the middle of the buckle (7) is arranged on the shell (H) in a pivoting mode, the other end of the secondary connecting rod (3) is connected with one end of the movable contact piece (5) in a rotating mode, the movable contact piece (5) is arranged on the first rotating shaft (5rs) in a rotating mode through a waist-.

2. The operating mechanism of a circuit breaker according to claim 1, wherein: the sliding groove (8) is arc-shaped, and the circle center of the sliding groove (8) is located on the rotating axis of the lock catch (7).

3. The operating mechanism of a circuit breaker according to claim 1, wherein: when the circuit breaker is in a switching-off state, the tripping fastener matching end (410) and the lock fastener matching end (700) are arranged oppositely, a matching gap (G) is arranged between the tripping fastener matching end (410) and the lock fastener matching end (700), and the tripping fastener matching end (410) is in lock-lock matching with the lock fastener matching end (700) when the handle (1) drives the operating mechanism to switch on.

4. The operating mechanism of a circuit breaker according to claim 1, wherein: the sliding groove (8) is arranged on the shell (H) and is of an integrated structure with the shell, and the first rear end (21) penetrates through the jump buckle (4) and is inserted into the sliding groove (8) to be in sliding fit with the sliding groove.

5. The operating mechanism of a circuit breaker according to claim 1, wherein:

the handle (1) rotates and drives the first rear end (21) to move along the sliding groove (8), the first rear end (21) drives the trip buckle (4) to rotate, the trip buckle matching end (410) is in lock buckle matching with the lock buckle matching end (700), meanwhile, the secondary connecting rod (3), the trip buckle (4), the movable contact piece (5) and the lock buckle (7) form a four-connecting-rod mechanism which is static relative to each other and rotates synchronously, until the movable contact (52) is initially contacted with a fixed contact (520) of the circuit breaker, the handle (1) continues to rotate to a switch-on position, the movable contact piece (5) is driven to swing by taking the fixed contact (520) as a fulcrum, the kidney-shaped hole (53) moves relative to the first rotating shaft (5rs), and the circuit breaker enters a switch-on state.

6. The operating mechanism of a circuit breaker according to claim 5, wherein:

the circuit breaker further comprises a first reset spring (90) for driving the movable contact piece (5) to reset and a second reset spring (92) for driving the lock catch (7) to reset, wherein the other end of the lock catch (7) is in driving fit with a protection mechanism of the circuit breaker;

when a fault occurs, the protection mechanism drives the lock catch (7) to rotate, so that the lock catch matching end (700) is disengaged from the lock catch matching end (410) of the trip catch, the first reset spring (90) drives the movable contact piece (5) to rotate, the movable contact (52) is disconnected from the fixed contact (520), meanwhile, the movable contact piece (5) drives the trip catch (4) to rotate by taking the first rear end (21) as a shaft through the secondary connecting rod (3), the circuit breaker enters a trip state, and after the circuit breaker trips, the second reset spring (92) drives the lock catch (7) to rotate and reset.

7. The operating mechanism of a circuit breaker according to claim 6, wherein: the moving contact piece (5) comprises a moving contact connecting part (50) and a moving contact part (51) which are arranged at two ends of the moving contact piece respectively, one end of the moving contact connecting part (50) is rotationally connected with the secondary connecting rod (3), the other end of the moving contact connecting part is provided with a waist-shaped hole (53), the end of the waist-shaped hole is bent and connected with one end of the moving contact part (51), the other end of the moving contact part (51) is provided with a moving contact (52), one end of a first reset spring (90) is connected with the shell (H), and the other end of the first reset.

8. The operating mechanism of a circuit breaker according to claim 5, wherein: the protection mechanism comprises a short-circuit protection mechanism (9) and an overload protection mechanism (6), the lock catch (7) is of a Y-shaped structure and comprises a matching arm (70), a short-circuit driving arm (71) in driving fit with the short-circuit protection mechanism (9) and an overload driving arm (72) in driving fit with the overload protection mechanism (6), one end of the matching arm (70) is provided with a lock catch matching end (700), and the other end of the matching arm is respectively connected with the short-circuit driving arm (71) and the overload driving arm (72) in a bending mode; the engagement arm (70) is pivotally arranged on the housing (H).

9. The operating mechanism of a circuit breaker according to claim 5, wherein: the tripping device (4) also comprises a switching-off indicating surface and a switching-on indicating surface which are arranged on one side of the tripping device, and an indicating hole matched with the switching-off indicating surface and the switching-on indicating surface is arranged on the shell (H); when the circuit breaker is switched on, the handle (1) rotates and drives the four-bar mechanism to rotate through the first connecting rod (2), so that a switching-on indicating surface is opposite to the indicating hole; when the circuit breaker trips, the movable contact piece (5) drives the tripping buckle (4) to rotate through the secondary connecting rod (3), so that the opening indicating surface is opposite to the indicating hole.

10. The operating mechanism of a circuit breaker according to claim 5, wherein: the operating mechanism of the circuit breaker also comprises a moving contact limiting table (7a) which limits the rotation angle of a moving contact piece (5) when the moving contact (52) and the static contact (520) are disconnected; the operating mechanism of the circuit breaker further comprises a lock catch positioning structure, a second reset spring (92) drives the lock catch (7) to rotate and reset, so that the lock catch (7) abuts against the lock catch positioning structure, and the moving contact limiting table (7a) and the lock catch positioning structure are both arranged on the shell (H).

11. The operating mechanism of a circuit breaker according to claim 3, wherein: the jump buckle matching end (410) of the jump buckle (4) during brake opening is positioned above the buckle matching end (700) of the buckle (7) and is provided with a matching gap (G); when the switch is switched on, the handle (1) drives the trip buckle (4) to rotate through the head connecting rod (2), so that the trip buckle matching end (410) moves towards the lock catch matching end (700) to eliminate a matching gap (G) to enable the trip buckle (4) to be matched with the lock catch (7) in a lock catch locking way.

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