CN115513014A - Tripping mechanism of circuit breaker and circuit breaker - Google Patents

Abstract

The invention relates to a tripping mechanism of a circuit breaker and the circuit breaker, wherein the tripping mechanism comprises a jump buckle, a re-buckle and a lock catch which are arranged in a rotatable manner, the re-buckle is of a labor-saving lever structure and comprises a first lever arm and a second lever arm, a first lap joint part is arranged on the jump buckle, a first press connection part is correspondingly arranged on the first lever arm, a second lap joint part is arranged on the second lever arm, a second press connection part is correspondingly arranged on the lock catch, and a rotating force arm of the first press connection part is smaller than a rotating force arm of the second lap joint part. The invention adds the rebuttoning in the tripping mechanism, so that the lock catch in the tripping mechanism is locked first and then buckled, then the lock catch is buckled and then the jump catch is locked, and the rebuttoning is a labor-saving lever structure, and the jump catch has smaller force applied on the lock catch through the action of the labor-saving lever structure, so that the tripping force of the electromagnetic release required by unlocking the lock catch is also reduced, and the contact can be automatically disconnected when an electric leakage fault occurs.

Description

Tripping mechanism of circuit breaker and circuit breaker

Technical Field

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

Background

The tripping mechanism is one of common mechanisms in the circuit breaker, and has the function that when abnormal conditions occur in a loop and the loop needs to be quickly disconnected, the moving contact is driven to be quickly opened through the quick action of tripping after the tripping mechanism is tripped. The existing tripping mechanism generally only comprises a jump button and a lock catch, the jump button is connected with a moving contact and lapped on the lock catch, the lock catch is matched with a release, and when the release acts on the lock catch, the lock catch acts, so that the matching of the jump button and the lock catch is released, and the quick action of the jump button is triggered. However, due to the limitation of the internal space of the circuit breaker, the size of the jump buckle is generally smaller (shorter), which results in a shorter force arm for applying force, and under the premise that the torque of the jump buckle is not changed, the shorter the force arm is, the larger the force of the jump buckle acting on the lock catch is, and in contrast, the larger the locking force of the lock catch to lock the jump buckle is, which further results in a larger unlocking force required for unlocking the lock catch. In the prior art, the push force and the push stroke of a push rod of a common tripper (such as an electromagnetic tripper) are small, so that the tripping force required by a lock catch is overlarge, the push force of the tripper can not push a tripping mechanism to trip, and when an abnormal condition occurs in a circuit, the rapid disconnection between contacts can not be ensured.

Disclosure of Invention

Therefore, in order to solve the above problems, the present invention provides a trip mechanism of a circuit breaker with an optimized structure and a circuit breaker with the trip mechanism.

The invention is realized by adopting the following technical scheme:

the invention provides a tripping mechanism of a circuit breaker, which comprises a jump buckle, a re-buckle and a lock catch, wherein the jump buckle, the re-buckle and the lock catch are arranged in a rotatable manner, the re-buckle is of a labor-saving lever structure and comprises a first lever arm and a second lever arm, a first lap joint part is arranged on the jump buckle, a first press connection part is correspondingly arranged on the first lever arm, a second lap joint part is arranged on the second lever arm, a second press connection part is correspondingly arranged on the lock catch, and the relative positions of the jump buckle, the re-buckle and the lock catch are configured as follows: through the relative rotation between the first crimping part and the second lapping part, the second crimping part can be in press-fit with the second lapping part, and the first crimping part can be in press-fit with the first lapping part at the same time, so that the rotation of the jump buckle is limited, wherein the rotating force arm of the first crimping part is smaller than that of the second lapping part.

Preferably, the projections of the first lever arm and the second lever arm on the rebutting rotation axis are overlapped or in a V-shaped acute angle staggered shape.

Preferably, the rotation centers of the refastening and the lock catch are respectively arranged at two sides of the rotation center of the jump buckle, so that the second lever arm is extended from one side of the rotation center of the jump buckle to the other side.

Preferably, the jump buckle is a swing arm structure, and the first bridging portion and the second bridging portion are respectively arranged at the tail ends of the jump buckle and the second lever arm.

Preferably, the lock catch is provided with a boss abutted to the tail end of the second lever arm, and the lapping amount of the second lapping part and the second crimping part is controlled by changing the height of the boss.

The invention also provides a circuit breaker, which comprises an operating mechanism, a contact assembly consisting of a moving contact and a fixed contact, wherein the moving contact and the operating mechanism are in linkage connection and have a movable stroke for realizing the on-off of the circuit breaker relative to the fixed contact.

Preferably, the length direction of the circuit breaker is taken as the front-back direction, the height direction of the circuit breaker is taken as the up-down direction, the operating mechanism and the contact assembly are approximately arranged up and down, and the tripping mechanism of the circuit breaker is approximately arranged front and back, so that a cross-shaped layout is formed.

Preferably, the relocking is hinged to the rear side of the jump buckle, and the locking buckle is hinged to the front side of the jump buckle, so that the second lever arm extends from back to front.

Preferably, the trip device further comprises a moving contact rotating shaft, the moving contact is arranged on the moving contact rotating shaft and follows the moving contact rotating shaft, the relocking is hinged to the front rear side of the trip buckle, the lock catch is hinged to the oblique upper side of the front side of the trip buckle, so that the second lever arm extends obliquely upwards, and the lock catch and the moving contact rotating shaft are arranged one above the other.

Preferably, the operating mechanism comprises a handle rotatably arranged above the rebuckling mechanism and a disk-shaped connecting seat used for mounting the handle, and the rebuckling mechanism is a bent arc-shaped extending structure matched with the shape of the disk-shaped connecting seat.

Preferably, the width direction of the circuit breaker is used as the left-right direction, the first crimping part and the second overlapping part of the re-buckling part are staggered in the left-right direction, and the jump buckle matched with the first crimping part and the lock buckle matched with the second overlapping part are also staggered in the left-right direction and are not located in a plane in the left-right direction.

Preferably, the operating mechanism includes a handle which is rotatably disposed, the handle has two stopping positions of opening and closing respectively, the handle is simultaneously linked with the trip and the moving contact through a link mechanism, the link mechanism transmits force to the trip so as to pull the first overlapping part of the trip to abut against the first crimping part and indirectly push the second overlapping part to abut against the second crimping part when the handle swings from the opening position to the closing position, thereby locking the tripping mechanism.

Preferably, the handle, the rebuttoning and the lock catch are respectively and correspondingly provided with a first elastic piece, a second elastic piece and a third elastic piece, the first elastic piece is used for providing the handle with an elastic force rotating towards the opening direction and indirectly providing the tripping with an elastic force resetting after tripping, the second elastic piece is used for providing the elastic force for the refastening and resetting after the tripping, and the third elastic piece is used for providing the elastic force for the locking buckle and resetting after the tripping.

Wherein, preferred to the direction of height of circuit breaker be upper and lower direction, second overlap joint portion is located the top of hasp axis of rotation, second crimping portion below is equipped with one and gives way the notch in order to provide detain the stroke space that resets again.

Preferably, the device further comprises a first gear part, wherein the first gear part is fixedly arranged on a reset path of the jump buckle and the re-buckle to limit the jump buckle and the re-buckle.

Preferably, the jump buckle can be reset before the re-buckle, and the re-buckle can be reset before the lock catch.

Preferably, one end of the re-buckling reset movement direction is provided with a first limiting surface, the jump buckle is provided with a first stopping portion which can be abutted against the first limiting surface to prevent re-buckling reset, and a first abutting end is arranged on the first limiting surface along the reset direction of the jump buckle, so that the first stopping portion is separated from the first limiting surface after passing over the first abutting end to release the reset stroke of the re-buckling, and the jump buckle can reset before the re-buckling.

Preferably, the one end that the hasp resets the direction of motion is equipped with the spacing face of second, detain again be equipped with can with thereby the spacing face butt of second prevents the second backstop portion that the hasp resets, along the direction of resetting of detaining again is in be equipped with second butt termination on the spacing face of second makes second backstop portion crosses break away from mutually with the spacing face of second behind the second butt termination and liberate the stroke that resets of hasp, make detain again can be prior to the hasp resets.

The invention has the following beneficial effects: according to the invention, the secondary buckle is added in the tripping mechanism, so that the buckle in the tripping mechanism is locked firstly and then buckled, and then locked and buckled, and the secondary buckle is a labor-saving lever structure, and the force exerted on the buckle by the secondary buckle is smaller under the action of the labor-saving lever structure, so that the tripping force of the electromagnetic release required by unlocking the buckle is also reduced, and the contact can be automatically disconnected when an electric leakage fault occurs.

Drawings

Fig. 1 is an overall schematic diagram of a circuit breaker in an embodiment;

fig. 2 is an exploded view of the circuit breaker according to the embodiment;

fig. 3 is a schematic perspective view of the circuit breaker in the embodiment (with the upper cover removed);

fig. 4 is a schematic diagram of the circuit breaker conduction system, operating mechanism and trip mechanism in an embodiment (closed state);

FIG. 5 is an exploded view of the operative linkage assembly of the embodiment;

FIG. 6 is a perspective view of a first side panel of the embodiment;

FIG. 7 is a perspective view (angle one) of the second side plate in the embodiment;

FIG. 8 is a perspective view of the handle in the embodiment;

FIG. 9 is a schematic view of a second link in an embodiment;

FIG. 10 is a schematic view of a third link in the embodiment;

FIG. 11 is a schematic view of a movable contact rotating shaft in an embodiment;

FIG. 12 is a perspective view of the buckle of the embodiment;

FIG. 13 is a perspective view (angle one) of the latch of the embodiment;

FIG. 14 is a perspective view (angle two) of the locking device of the embodiment;

FIG. 15 is a perspective view of the exemplary refastening structure;

FIG. 16 is a schematic view of an embodiment of a refastenable and snap-lock engagement;

fig. 17 is a schematic illustration of the circuit breaker conduction system, operating mechanism and trip mechanism in an embodiment (manual opening state);

fig. 18 is a schematic diagram of the circuit breaker conductive system, operating mechanism and trip mechanism in an embodiment (trip and open state);

FIG. 19 is a schematic illustration of the engagement of the electromagnetic trip, the linkage, and the latch of the embodiment;

FIG. 20 is a schematic perspective view of a linkage of an embodiment;

FIG. 21 is a perspective view (angle two) of the second side plate in the embodiment;

fig. 22 is a schematic view illustrating the first limiting surface of the refastening and the first stopping portion of the jump buckle in the embodiment;

FIG. 23 is a schematic view of the second position-limiting surface of the locking device and the second stopping portion of the re-locking device according to the embodiment;

fig. 24 is a schematic view showing the first crimping portion, the jumper buckle, the second overlapping portion, and the buckle of the embodiment being shifted in the left-right direction.

Detailed Description

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

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

Referring to fig. 1 to 4, as a preferred embodiment of the present invention, there is provided a circuit breaker, more specifically, a residual current operated circuit breaker, including an outer casing 100 and a conductive system 3, wherein the outer casing 100 is a circuit breaker housing formed by fixedly joining an upper cover 1001 and a base 1002; referring to fig. 4, the conductive system 3 is disposed inside the outer casing 100, and the conductive system 3 includes a contact assembly composed of a moving contact 301 and a fixed contact 302, and further includes a wiring terminal 300 and a conductive copper bar, etc. to form a conductive loop of the circuit breaker, where the moving contact 301 has a moving stroke relative to the fixed contact 302 to achieve contact or separation of the moving contact 301 and the fixed contact 302, thereby achieving opening and closing of the circuit breaker. The inner cavity of the outer shell 100 is further provided with a zero sequence current transformer 1003 for measuring residual current, an arc extinguishing grid 1004 for arc extinguishing and an electromagnetic trip 4 for tripping and opening, and the outer shell 100 is further provided with a test button 41 for detecting the leakage function of the circuit breaker. The above structure and layout is a conventional arrangement for a circuit breaker. For convenience of description, in the present embodiment: defining the height direction of the circuit breaker, namely the Z1 and Z2 directions in FIG. 2 are the up and down directions respectively; defining the width direction of the breaker, namely the X1 and X2 directions in FIG. 2 are the left and right directions respectively; and defines the length direction of the breaker, i.e. the Y1 and Y2 directions in fig. 2 are the front and rear directions, respectively.

The circuit breaker further comprises an operating linkage assembly 2, and referring to fig. 4 and 5, the operating linkage assembly 2 comprises a first side plate 22 and a second side plate 23 which are opposite in the left-right direction, the first side plate 22 and the second side plate 23 are oppositely jointed to form a mounting base of the operating linkage assembly 2, and the circuit breaker further comprises a handle 11, a first connecting rod 13, a second connecting rod 14, a third connecting rod 15, a jump buckle 17, a re-buckle 18 and a lock buckle 20 which are arranged between the first side plate 22 and the second side plate 23. The handle 11, the first link 13, the second link 14 and the third link 15 constitute an operating mechanism of the circuit breaker, and are used for controlling the opening and closing movement of the moving contact 301 by manually pulling the handle 11; the tripping mechanism of the circuit breaker is composed of the tripping 17, the secondary trip 18 and the lock catch 20, and is used for cooperating with the electromagnetic trip 4 to realize tripping and opening of the circuit breaker.

Specifically, the handle 11 is rotatably connected to the first side plate 22, and referring to fig. 6 and 8, in this embodiment, the handle 11 is specifically rotatably inserted into the first insertion hole 2201 of the first side plate 22 by the handle shaft 1101. Specifically, referring to fig. 4, 5 and 8-10, in this embodiment, the first link 13 is a U-shaped rod, one end of the second link 14 is provided with a second jack 1401, the other end of the second link 14 is provided with a third jack 1402, one end of the third link 15 is provided with a fourth jack 1501, and the other end of the third link is provided with a fifth jack 1502, wherein the second jack 1401 and the fourth jack 1501 are overlapped, one end of the first link 13 is rotatably inserted into the sixth jack 1103 on the handle 1, and the other end of the first link 13 is rotatably inserted into the second jack 1401 and the fourth jack 1501.

A movable contact rotating shaft 16 is hinged to the third connecting rod 15, and specifically, referring to fig. 4, 10 and 11, a fifth inserting hole 1502 of the third connecting rod 15 is hinged to a seventh inserting hole 1601 arranged on the movable contact rotating shaft 16 through a pin. The moving contact rotating shaft 16 is also hinged to the outer casing 100 through the pillar 1602 provided thereon, the moving contact 301 is installed on the moving contact rotating shaft 16 and moves along with the movement of the moving contact rotating shaft 16, for example, the moving contact 301 may be fixedly connected or hinged to the moving contact rotating shaft 16. In this embodiment, the movable contact 301 is hinged to the movable contact rotating shaft 16, one end of the movable contact 301 is limited at the limiting position of the movable contact rotating shaft 16 by an elastic element, and when the other end of the movable contact 301 is limited by the fixed contact 302 during the over-stroke movement of the movable contact 30, one end of the movable contact 301 leaves the limiting position of the movable contact rotating shaft 16 under the action of the elastic element.

The jump buckle 17 and the lock buckle 20 are rotatably connected to a first side plate 22, and the second buckle 18 is rotatably connected to a second side plate 23. Specifically, referring to fig. 6-7 and fig. 12-15, the eighth insertion hole 1702 formed in the jump buckle 17 is hinged to the ninth insertion hole 2203 formed in the first side plate 22 through a pin; the rebutch 18 is rotatably inserted into the tenth insertion hole 1802 of the rebutch rotating shaft 2301 of the second side plate 23, and the latch 20 is rotatably inserted into the eleventh insertion hole 2204 of the first side plate 22 through the latch rotating shaft 2002 of the latch.

The jump ring 17 is further provided with a twelfth insertion hole 1701 at a middle section of the length thereof, and the third insertion hole 1402 of the second link 14 is hinged with the twelfth insertion hole 1701 through a pin shaft.

In the above description, various hinge modes are exemplified, such as a hinge mode in which a hole and a hole are hinged through a pin shaft, or a hinge mode in which a hole and a shaft are inserted, and these hinge setting means can be replaced with each other in other embodiments, and it is a feasible solution to realize the hinge function.

In the present embodiment, the components of the operating linkage assembly 2 are respectively and rotatably connected to the first side plate 22 (such as the jump buckles 17) and are respectively and rotatably connected to the second side plate 23 (such as the rebutch 18), but it is obvious that in other embodiments, the components can be arbitrarily modified to be rotatably connected to the first side plate 22 and/or the second side plate 23, which is not a technical obstacle for those skilled in the art. The first side plate 22 and the second side plate 23 are only one specific embodiment, and in other embodiments, a mounting base is provided, on which these components (such as the jump button 17 and the rebuckling 18) can be rotatably disposed. The mounting base does not need to be the first side plate 22 and the second side plate 23 of the specific structure of the embodiment, and may be a mounting plate fixedly disposed in the outer casing 100, or even an inner wall of the outer casing 100.

Summarizing, in the operation linkage assembly 2, the handle 11 and the tripping mechanisms (i.e., the tripping mechanisms, i.e., the jump button 17, the rebuckling 18 and the lock catch 20) are all rotatably arranged; one end of the first connecting rod 13 is hinged with the handle 11, and the other end of the first connecting rod is hinged with the same hinge point with the second connecting rod 14 and the third connecting rod 15; the second connecting rod 14 is also hinged on the jump buckle 17; the third connecting rod 15 is also hinged with the movable contact rotating shaft 16; the movable contact 301 is mounted on the movable contact rotating shaft 16 and moves along with the movement of the movable contact rotating shaft 16.

Next, the principle of locking and unlocking (tripping) of the trip mechanism will be explained. Referring to fig. 4 and 12-18, the jump buckle 17 is provided with a first overlapping portion 1703, and the corresponding refastening 18 is provided with a first crimping portion 1801; the re-buckling 18 is provided with a second overlapping portion 1803, and the corresponding buckle 20 is provided with a second crimping portion 2001. Wherein, the relative positions of the jump buckle 17, the rebuckling 18 and the lock buckle 20 are configured as follows: by the relative rotation therebetween, the second crimping part 2001 can be press-fit to the second overlapping part 1803 while the first crimping part 1801 is press-fit to the first overlapping part 1703, thereby restricting the rotation of the jumper 17. As shown in fig. 4, when the circuit breaker is in the closed state, the latch 20 presses down on the second overlapping portion 1803 of the re-latch 18 by the second pressing portion 2001, and at the same time, the re-latch 18 presses down on the first overlapping portion 1703 of the trip latch 17 by the first pressing portion 1801, that is, the upward swing of the trip latch 17 is limited and locked.

The handle 11 is provided with a first elastic member 1006 (i.e. a handle spring), it can be understood that when the latch 20 is locked and the circuit breaker is switched from the manual opening state (fig. 17) to the manual closing state (fig. 4) through the swing of the handle 11, the handle spring stores energy, the handle 11 gives a force (pulling force) of upward swing to the trip buckle 17 through the first link 13 and the second link 14, but the trip buckle 17 cannot swing upward due to the locking of the trip buckle 17 by the rebuckling 18 and the latch 20, that is: in a closing state, the tripping device 17 is in a locking state with balanced stress on the re-tripping device 18 and the lock catch 20. Since the trip 17 is locked, when the switch is manually opened or closed, the second link 14 rotates with a hinge point a between the second link and the trip 18 as a pivot, so as to drive the third link 15, the movable contact rotating shaft 16 and the movable contact 301 to move. When the lock catch 20 is unlocked, the stress balance state is broken, and tripping and opening are caused. Referring to fig. 4, when the latch 20 is driven by the electromagnetic trip 4 and the second crimping portion 2001 is separated from the second overlapping portion 1803 of the relocking 18 (clockwise rotation in the specific view state of fig. 4), the trip 17 pushes the relocking 18 upward and swings until the first crimping portion 1801 of the relocking 18 cannot press the first overlapping portion 1703 of the trip 17, so that the trip 17 is unlocked (tripped) and swings clockwise rapidly (in the specific view state of fig. 4), and the second link 14 is driven to rotate by taking the hinge point B between the trip 17 and the mounting base as a rotation axis, thereby driving the movable contact 301 to trip and break, and rapidly implementing the breaking operation. Fig. 18 shows the general state of the tripping mechanism at the tripping instant in the tripping opening phase (the final state is also influenced by the return spring, which will be described below), which can be referred to.

In the above-mentioned trip mechanism solution, the biggest difference between the present embodiment and the prior art is that the rebuckling 18 is added. In the conventional art, the lock buckle 20 normally directly acts on the jump buckle 17, that is, the lock of the jump buckle 17 is achieved by the lock buckle 20 alone, for example, in a common scheme, the lock buckle 20 is hinged at a position at the rear side of the jump buckle 17 (that is, at a hinged position approximately at the rebuckling 18 in the embodiment). Due to the limitation of the internal space of the circuit breaker, the size of the jump buckle 17 is generally smaller (shorter), which results in a shorter force arm for applying force, and on the premise that the torque of the jump buckle 17 is not changed, the shorter the force arm is, the larger the force of the jump buckle 17 acting on the lock catch 20 is, and in contrast, the larger the locking force of the lock catch 20 to lock the jump buckle 17 is, which results in a larger unlocking force required for unlocking the lock catch 20. However, the thrust and the pushing stroke of the conventional electromagnetic release are both small, the tripping force required by the latch 20 is too large, the thrust of the electromagnetic release 4 may not push the product to trip, and when a residual current occurs in the circuit and reaches a rated value (leakage) of the circuit breaker, the contact cannot be guaranteed to be disconnected under the condition of leakage fault.

In the embodiment, the secondary buckle 18 is added, the lock buckle 20 locks the secondary buckle 18 first, and the secondary buckle 18 locks the jump buckle 17 second, in other words, the jump buckle 17 applies force to the secondary buckle 18 first, and then the secondary buckle 18 applies force to the lock buckle 20. In the embodiment, the refastener 18 is a labor-saving lever structure, as shown in fig. 15, the refastener 18 includes a first lever arm 181 and a second lever arm 182, wherein a first press-connecting portion 1801 is disposed on the first lever arm 181, a second overlapping portion 1803 is disposed on the second lever arm 182, and a rotating arm of the first press-connecting portion 1801 is smaller than a rotating arm of the second overlapping portion 1803. Therefore, under the premise that the torque of the jump buckle 17 is not changed, the force of the jump buckle 17 acting on the lock catch 20 is smaller through the action of the labor-saving lever structure re-buckling 18, the tripping force of the electromagnetic release 4 required by unlocking the lock catch 20 is also smaller, and the contact can be automatically disconnected when an electric leakage fault occurs.

The jump button 17 is a swing arm structure, and in this embodiment, the first bridging portion 1703 and the second bridging portion 1803 are bridging surfaces (or may be bridging edges) respectively disposed at the ends of the jump button 17 and the second lever arm 182. So that the jump buckle 17 can be quickly tripped and jumped up once the first bridging portion 1703 and the second bridging portion 1803 are tripped, and the tripping response speed is improved. The first crimping part 1801 and the second crimping part 2001 are corner structures formed by two planes, so that the second overlapping part 1803 can be quickly separated from the second crimping part 2001 once sliding out of the angular second crimping part 2001 when the lock 20 is turned by a certain angle, and the first overlapping part 1703 can be quickly separated from the first crimping part 1801 once sliding out of the angular first crimping part 1801 when the buckle 18 is turned by a certain angle. In order to facilitate the reset of the jumper 17, the slope of the upper one of the two planes constituting the first crimping part 1801 is larger, so that the plane with the larger slope can serve as a guide surface to guide the jumper 17 to be reliably reset when the jumper 17 is released and reset, and the same applies to the two planes constituting the second crimping part 2001.

In this embodiment, the length of the first lever arm 181 is smaller than the length of the second lever arm 182, and the second overlapping portion 1803 is disposed at the end of the second lever arm 182, so that the rotating force arm of the first crimping portion 1801 is smaller than that of the second overlapping portion 1803. In addition, in the embodiment, the projections of the first lever arm 181 and the second lever arm 182 on the rotation axis of the rebuckling 18 are overlapped, that is, the first lever arm 181 and the second lever arm 182 extend in the same direction but are not located in the same plane in the left-right direction, so that the occupied space and the length of the rebuckling 18 are minimized, the installation space is saved, and interference to other components inside the circuit breaker is avoided, and on the other hand, the jump buckle 17 matched with the first crimping part 1801 and the lock catch 20 matched with the second lapping part 1803 are staggered in the left-right direction and are not located in a plane in the left-right direction (see fig. 24 in a matching manner), so that the space in the left-right direction of the circuit breaker is utilized, the movement interference between the jump buckle 17 and the lock catch 20 is avoided, and the trip mechanism can be arranged more compactly and reasonably. In other embodiments, the first lever arm 181 and the second lever arm 182 are angled at a small acute angle, such that the arrangement may interfere with components below the rebuckling 18, such as contact assemblies, arc chute plates, etc., while effectively reducing the space occupied by the rebuckling 18. Of course, in case of no consideration of space occupation, the first lever arm 181 and the second lever arm 182 may be two collinear lever arms extending in opposite directions or angled at an obtuse angle in other embodiments, but this arrangement is not as advantageous in terms of space utilization and circuit breaker miniaturization design.

In the embodiment, the operating mechanism and the contact assembly are arranged approximately vertically, and the tripping mechanism is arranged approximately front and back, so that a cross-shaped cross layout is formed, and the length and height space of the circuit breaker are fully utilized. In order to provide the re-buckling 18 with a longer length in the limited inner space of the circuit breaker, the constrained end of the re-buckling 18 is hinged on the back side of the jump buckle 17, the locking buckle 20 is hinged on the front side of the jump buckle 17, and the re-buckling 18 extends from the constrained end to the free end from the back to the front, so that the length space of the circuit breaker in the front and back direction is used as much as possible, and the rotating arm of the second overlapping part 1803 is larger. Furthermore, in the present embodiment, the constraint end of the refastening 18 is hinged on the right back side of the jump buckle 17, and the latch 20 is hinged on the front side of the jump buckle 17, so that the refastening 18 also extends obliquely, which further increases the rotating arm of the second strap 1803, on the other hand, the latch 20 is hinged on the front side of the jump buckle 17, which can also avoid the position interference between the latch 20 and the movable contact rotating shaft 16, and in the present embodiment, the latch 20 and the movable contact rotating shaft 16 are arranged one above the other, which improves the structure compactness.

In this embodiment, the handle 11 and the rebuckling 18 are rotatably connected to the mounting base body one on the other, a disk-shaped connecting seat 2309 for mounting the handle 11 is arranged on the mounting base body, and the rebuckling 18 is a curved extending swing arm structure matched with the disk-shaped connecting seat 2309, so as to give way to the disk-shaped connecting seat 2309, and the compactness of the internal structure of the circuit breaker can be improved.

A boss 2006 is fixedly arranged on the latch 20, and the boss 2006 is used for abutting against the free end (i.e. the tail end) of the refastening 18, so as to control the overlapping amount of the second overlapping portion 1803 and the second crimping portion 2001.

Referring to fig. 2, fig. 19-21, the electromagnetic trip 4 drives the lock catch 20 to unlock through a linkage 24, the electromagnetic trip 4 and the linkage 24 are both disposed on a side of the second side plate 23 away from the trip mechanism, in this embodiment, the linkage 24 is a seesaw structure, and the linkage 24 is rotatably inserted into the rotating shaft 2303 of the second side plate 23 through a thirteenth insertion hole 2401. A first toggle portion 2403 and a second toggle portion 2402 are radially and outwardly extended from the linkage 24, wherein the first toggle portion 2403 is close to the push rod of the electromagnetic release 4. Referring to fig. 14, a convex pillar 2005 is disposed on the lock catch 20, the convex pillar 2005 extends to the vicinity of the second toggle portion 2402 through the second side plate 23, when the push rod of the electromagnetic release 4 is operated, the first toggle portion 2403 is pushed to rotate the linkage 24, and then the second toggle portion 2402 pushes the convex pillar 2005 to rotate the lock catch 20 to unlock.

The linkage 24 is also provided with a reset member for resetting the linkage 24 and the push rod of the electromagnetic trip 4 after the circuit breaker is tripped. In this embodiment, the reset member is a torsion spring 25, the torsion spring 25 is installed on the linkage member 24, a first arm of the torsion spring 25 abuts against a first abutting surface 2404 provided on the linkage member 24, a second arm is disposed near the movable contact rotating shaft 16 (specifically, near a second abutting surface 1603 provided on the movable contact rotating shaft), when the movable contact rotating shaft 16 rotates to the opening position, the second abutting surface 1603 on the movable contact rotating shaft pushes the second arm of the torsion spring 25, so that the first arm of the torsion spring 25 generates torsional elastic force to push the linkage member 24 to rotate, and the linkage member 24 pushes the push rod of the electromagnetic release 4 to reset. Electromagnetic trip 4 may also be other trip types in other embodiments, such as an over-temperature trip, an under-voltage trip.

As shown in fig. 5, the handle 11, the rebuckling 18 and the locking buckle 20 are respectively provided with a first elastic member 1006, a second elastic member 1007 and a third elastic member 1008. The first elastic element 1006 acts on the mounting base (for example, acts on the first side plate 22 or the second side plate 23 in this embodiment) at one end, and acts on the handle 11 at the other end, so as to provide an elastic force for the handle 11 to rotate in the opening direction; the second elastic member 1007 acts on the mounting base at one end and acts on the release button 18 at the other end to provide an elastic force to the release button 18, and the elastic force makes the release button 18 rotate toward the locking position for performing the press-fit locking on the release button 17, so as to reset the release button 18 after the release mechanism is released and the press-fit of the release button 18 and the release button 17 is released; the third resilient member 1008 acts on the mounting base at one end and on the latch 20 at the other end to provide a resilient force to the latch 20 that causes the latch to rotate toward a locked position where it is press-fit locked to the release 18, thereby resetting the latch 20 after the release mechanism is tripped and the press-fit of the latch 20 and release 18 is released. For simplicity, in the specific view of the general state of the tripping instant of fig. 18, the first elastic member 1006 provides an elastic force for clockwise rotation of the handle, the second elastic member 1007 provides an elastic force for clockwise rotation of the relocker, and the third elastic member 1008 provides an elastic force for counterclockwise rotation of the lock 20 (the rotation direction is indicated by an arrow in fig. 18). When the circuit breaker is tripped and opened, under the action of the elastic force of the first elastic member 1006, the handle 11 rotates to the opening position, and the trip catch 17 is driven to swing downwards to reset through the force transmission of the first connecting rod 13 and the second connecting rod 14, and then the trip catch 18 and the latch catch 20 are reset respectively under the action of the second elastic member 1007 and the third elastic member 1008. In this embodiment, in order to make the structure of the trip mechanism more compact, the free end of the re-buckle 18 is disposed above the rotation axis of the lock 20, and since the lock 20 is located on the reset path of the re-buckle 18, a relief notch 2007 (fig. 16) is disposed below the second press-contact portion 2001 of the lock 20 to provide a stroke space for downward reset of the re-buckle 18. As shown in fig. 18, a first shift portion 2306 is disposed below the jump buckle 17 and the rebuckling 18, and the jump buckle 17 and the rebuckling 18 are abutted against the first shift portion 2306 to be limited to a proper lowest limit position when swinging downwards to reset, so as to prevent the jump buckle 17 and the rebuckling 18 from swinging downwards to an excessively large extent and being unable to return to a press-buckle matching state. At this time, if the circuit breaker in the tripping and opening state is manually pulled back to the closing state, the trip 17 will be tilted upward and abut against the rebuckling 18 to form a press-buckling fit under the transmission action of the handle 11, and push the rebuckling 18 to swing upward and abut against the lock catch 20 to form a press-buckling fit, thereby completing the resetting action of a complete tripping mechanism.

In addition, a second stopping portion 2307 is further disposed above the rebuckling 18 (in this embodiment, the second stopping portion 2307 is a top wall of the second side plate 23, and in other embodiments, other stopping members may also be provided) to control a highest limit position of the upward swing of the rebuckling 18, so as to ensure that the rebuckling 18 can be reliably reset.

In this embodiment, the first elastic member 1006, the second elastic member 1007 and the third elastic member 1008 are all torsion springs, and in other embodiments, they may also be other elastic members such as tension springs and compression springs, and only the installation and connection positions need to be changed adaptively, so as to provide potential energy with the same motion effect.

Obviously, the reset of the jump buckle 17, the rebuckling 18 and the lock buckle 20 need to be in a certain order. It will be appreciated that if the shackle 20 is reset prior to the rebutch 18, a stop will be provided for the reset of the rebutch 18; if the rebuckling 18 resets before the skip buckle 17, it will stop the reset of the skip buckle 17. Therefore, the three parts need to be reset in sequence by the jump buckle 17, the rebutch 18 and the lock catch 20. In order to ensure the reliable proceeding of the sequential resetting, referring to fig. 22 and 23, in this embodiment, one end of the resetting direction of the rebuckling 18 (i.e. the lower end of the rebuckling 18 in this embodiment) is provided with a first limiting surface 1806, the skip buckle 17 is provided with a first stopping portion 1705 capable of abutting against the first limiting surface 1806 to stop the resetting of the rebuckling 18, in this embodiment, the first stopping portion 1705 is a protruding shaft extending from the skip buckle 17, the first limiting surface 1806 is a curved surface matching with the movement track of the first stopping portion 1705, the first limiting surface 1806 is provided with a first abutting end 18061 along the resetting direction of the skip buckle 17, and the first stopping portion 5 is separated from the first limiting surface 1806 after crossing the first abutting end 18061 to release the further resetting stroke of the rebuckling 18; similarly, a second limiting surface 2008 is disposed at one end of the latch 20 in the resetting direction, the free end of the re-buckle 18 serves as a second stop portion that abuts against the second limiting surface 2008 to prevent the latch 20 from resetting, the second limiting surface 2008 is a curved surface that matches with the movement track of the second stop portion, a second abutting end 20081 is disposed on the second limiting surface 2008 along the resetting direction of the re-buckle 18, and the second stop portion crosses the second abutting end 20081 and then separates from the second limiting surface 2008 to release the further resetting stroke of the latch 20.

The circuit breaker further comprises a testing mechanism, as shown in fig. 19, the testing mechanism comprises a testing button 41, a first testing spring 42, a second testing spring 43, a movable contact spring 44, a shielding cover 45 (which is a charged body), a connecting spring 46 and a resistor 47. The testing button 41 is assembled on the outer shell 100 and can only move up and down within a certain range, the first testing spring 42 is a torsion spring installed on the second side plate 23, one torsion arm of the first testing spring is lapped on the testing button 41, the other torsion arm is lapped on the shielding cover 45, the second testing spring 43 is also a torsion spring installed on the second side plate 23, two torsion arms of the second testing spring are lapped on different positions on the second side plate 23, the movable contact spring 44 is a torsion spring installed on the movable contact rotating shaft 16, one torsion arm of the first testing spring is lapped on the movable contact 301, the other torsion arm is lapped on the movable contact rotating shaft 16 and is positioned near the torsion arm of the second testing spring 43, the movable contact spring 44 moves along with the contact rotating shaft 16, the shielding cover 45 is sleeved on the electromagnetic release 4 and is installed on the second side plate 23, the connecting spring 46 is installed on the second side plate 23, one torsion arm of the first testing spring is lapped on the shielding cover 45, the other torsion arm presses a pin of the resistor 47 on the shielding cover 45, the resistor 47 is installed between the first side plate 22 and the second side plate 23, and the other pin is fixedly connected to the wiring plate. When the circuit breaker is in a switching-on position, the moving contact spring 44 is contacted with the second testing spring 43 together, at the moment, the testing button 41 is pressed to enable the testing loop to be conducted, and the circuit breaker is disconnected; when the circuit breaker is in the off position, the movable contact spring 44 is not electrically connected with the second test spring 43, and the test loop cannot be conducted even if the test button 41 is pressed, so that the circuit can be protected from being damaged. The test loops of the embodiment are all connected by using springs, signal wires are not used for soldering, and the risks of wire breakage and insufficient soldering are reduced; and (3) integrating the functions of parts in a test loop: the shielding case is used for shielding the influence of an external magnetic field on the electromagnetic release and is also used as a conductor in a test loop, and the moving contact spring is used for generating contact pressure and is also used as a conductor in the test loop, so that the number of parts is saved.

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

Claims (16)

1. The tripping mechanism of the circuit breaker is characterized by comprising a jump buckle, a re-buckle and a lock catch which are rotatably arranged, wherein the re-buckle is of a labor-saving lever structure and comprises a first lever arm and a second lever arm, the jump buckle is provided with a first lap joint part, the first lever arm is correspondingly provided with a first crimping part, the second lever arm is provided with a second lap joint part, the lock catch is correspondingly provided with a second crimping part,

the relative positions of the jump buckle, the rebuckling and the lock buckle are configured as follows: through the relative rotation between the first crimping part and the second lapping part, the second crimping part can be in press-fit with the second lapping part, and the first crimping part can be in press-fit with the first lapping part at the same time, so that the rotation of the jump buckle is limited, wherein the rotating force arm of the first crimping part is smaller than that of the second lapping part.

2. The trip mechanism of a circuit breaker of claim 1, wherein the projections of said first and second lever arms on said rebuckling axis overlap or are in the shape of an acute angle cross of a "V".

3. The circuit breaker trip mechanism of claim 2, wherein the center of rotation of the rebucker and the latch are disposed on opposite sides of the center of rotation of the trip buckle, respectively, such that the second lever arm extends from one side of the center of rotation of the trip buckle to the other side.

4. The trip mechanism of a circuit breaker of claim 1 wherein said trip buckle is a swing arm structure, said first and second strap portions being disposed at respective distal ends of said trip buckle and said second lever arm.

5. The trip mechanism of circuit breaker as claimed in claim 4, wherein said latch is provided with a projection abutting against the end of said second lever arm, and the height of the projection of said projection is varied to control the amount of overlap of said second overlapping portion and said second crimping portion.

6. The circuit breaker comprises an operating mechanism, a contact assembly consisting of a moving contact and a fixed contact, wherein the moving contact is in linkage connection with the operating mechanism and has a movable stroke for realizing the on-off of the circuit breaker relative to the fixed contact, the circuit breaker further comprises a tripping mechanism for realizing the tripping and separating of the circuit breaker and a tripper for triggering the tripping mechanism to trip, and the circuit breaker is characterized in that the tripping mechanism is the tripping mechanism of the circuit breaker in any one of claims 1-5, the tripping button is in linkage connection with the operating mechanism, and the tripper is in transmission connection with the locking button.

7. The circuit breaker of claim 6, wherein the operating mechanism and the contact assembly are arranged substantially vertically, and the tripping mechanism of the circuit breaker is arranged substantially vertically, with the length direction of the circuit breaker being the front-rear direction and the height direction of the circuit breaker being the top-bottom direction, so as to form a cross-shaped layout.

8. The circuit breaker of claim 7, wherein the rebucker is hinged to a rear side of the jump buckle and the catch is hinged to a front side of the jump buckle such that the second lever arm is extended from rear to front.

9. The circuit breaker of claim 8, further comprising a moving contact rotating shaft, wherein the moving contact is mounted on the moving contact rotating shaft and follows the moving contact rotating shaft, the relocking is hinged to a right rear side of the jump buckle, the latch is hinged to a position obliquely above a front side of the jump buckle, so that the second lever arm extends obliquely upward, and the latch and the moving contact rotating shaft are arranged one above the other.

10. The circuit breaker of claim 7, wherein the operating mechanism includes a handle rotatably disposed over the relocker, and further comprising a disk-shaped connecting base for mounting the handle, the relocker being an arcuate extension that matches the profile of the disk-shaped connecting base.

11. The circuit breaker of claim 6, wherein the width direction of the circuit breaker is a left-right direction, the first and second overlapping portions of the re-latch are staggered in the left-right direction, and the jumper cooperating with the first overlapping portion and the latch cooperating with the second overlapping portion are also staggered in the left-right direction and do not lie in a plane in the left-right direction.

12. The circuit breaker of claim 6, wherein the operating mechanism includes a rotatably disposed handle, the handle having two rest positions for opening and closing, the handle being operatively connected to the trip and the movable contact simultaneously via a linkage mechanism, the linkage mechanism transmitting a force to the trip such that swinging the handle from the open position to the closed position pulls the first leg of the trip against the first crimp and indirectly pushes the second leg against the second crimp, thereby locking the trip mechanism.

13. The circuit breaker according to claim 12, wherein the handle, the release and the latch are respectively and correspondingly provided with a first elastic member, a second elastic member and a third elastic member, the first elastic member is used for providing the handle with an elastic force rotating towards the opening direction and indirectly providing the trip with an elastic force of resetting after releasing, the second elastic member is used for providing the release with an elastic force of resetting after releasing, and the third elastic member is used for providing the latch with an elastic force of resetting after releasing.

14. The circuit breaker according to claim 13, wherein the height direction of the circuit breaker is taken as the up-down direction, the second overlapping portion is disposed above the latch rotation axis, and a relief notch is disposed below the second crimping portion to provide a stroke space for the re-latching; and/or the first gear part is fixedly arranged on a reset path of the jump buckle and the re-buckle to limit the jump buckle and the re-buckle.

15. The circuit breaker of claim 13, wherein the trip can be reset prior to the rebuckling, which can be reset prior to the latch.

16. The circuit breaker according to claim 15, wherein one end of the re-buckling reset movement direction is provided with a first limit surface, the jump buckle is provided with a first stop portion capable of abutting against the first limit surface so as to prevent the re-buckling reset, and a first abutting end is provided on the first limit surface along the reset direction of the jump buckle, so that the first stop portion is separated from the first limit surface after crossing the first abutting end so as to release the reset stroke of the re-buckling, so that the jump buckle can reset before the re-buckling; and/or the one end of hasp motion direction that resets is equipped with the spacing face of second, detain again be equipped with can with thereby the spacing face butt of second prevents the second backstop portion that the hasp resets, along detain again the direction of resetting be equipped with the second butt on the spacing face of second and terminate the end, make the second backstop portion cross behind the second butt termination end and the spacing face of second break away from mutually and liberate the stroke that resets of hasp, make detain again can be prior to the hasp resets.

Images