EP4318537A1

EP4318537A1 - Circuit breaker

Info

Publication number: EP4318537A1
Application number: EP22921471.3A
Authority: EP
Inventors: Xiaomin XIA; Xiaohai CHEN; Fajin ZHENG; Fan TANG
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2022-01-21
Filing date: 2022-08-16
Publication date: 2024-02-07
Also published as: WO2023138042A1; CN116504595A; AU2022434579A1

Abstract

A circuit breaker includes a shell and at least two L poles, wherein an electric leakage protection electrode is disposed between the two L poles; an electromagnetic coil of an electromagnetic system is disposed on one side of a third operating mechanism of the electric leakage protection electrode, and a connecting rod is rotatably assembled on one side of the electromagnetic coil. The third operating mechanism is coordinated with operating mechanisms of the two adjacent L poles through the connecting rod. When the circuit breaker is closed, the connecting rod rotates to a closing position along with the electric leakage protection electrode and the operating mechanisms of the two adjacent L poles. When the circuit breaker is opened, the connecting rod rotates towards an opening direction along with the operating mechanisms of the two L poles adjacent to the electric leakage protection electrode, but the third operating mechanism does not act; and in the event of an electric leakage fault, the third operating mechanism drives the operating mechanisms of the two adjacent L poles to jointly rotate towards an opening direction through the connecting rod. According to the present invention, the electric leakage protection electrode is in linkage connection with the two adjacent L poles through the connecting rod, so that the degree of cooperation between the circuit breaker poles of the circuit breaker is improved.

Description

TECHNICAL FIELD

The present invention relates to the field of low-voltage electrical appliances, and more particularly to a circuit breaker.

BACKGROUND ART

In the field of low-voltage transmission and distribution, a circuit breaker is major circuit control equipment. For multi-pole circuit breakers, especially assembled circuit breakers, the most common method is to achieve the linkage between various operating mechanisms through assembled shafts. However, in an integrated circuit breaker, affected by the structural layout and other factors, it is difficult for two circuit breaker poles that are not adjacent to each other to achieve the linkage through an assembled shaft, resulting in low applicability of the assembled shaft. Especially in a circuit breaker where an electric leakage protection electrode is disposed between two operating mechanisms, an assembled shaft has defects in taking into account an electric leakage protection function and linkage cooperation, which reduces the reliability of the circuit breaker.

SUMMARY OF THE INVENTION

An objective of the present invention is to overcome the defects of the prior art and provide a circuit breaker with a simple structure and high reliability.
In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

A circuit breaker, comprising a shell, wherein a plurality of circuit breaker poles is disposed inside the shell side by side; the plurality of circuit breakers includes at least two L poles, and an electric leakage protection electrode is disposed between the two L poles; an electromagnetic coil of an electromagnetic system is disposed on one side of a third operating mechanism of the electric leakage protection electrode; a connecting rod is rotatably assembled on one side of the electromagnetic coil; the third operating mechanism is coordinated with operating mechanisms of the two adjacent L poles through the connecting rod;
when the circuit breaker is closed, the connecting rod rotates to a closing position along with the electric leakage protection electrode and the operating mechanisms of the two adjacent L poles;
when the circuit breaker is opened, the connecting rod rotates towards an opening direction along with the operating mechanisms of the two L poles adjacent to the electric leakage protection electrode, but the third operating mechanism does not act; and
in the event of an electric leakage fault, the third operating mechanism drives the operating mechanisms of the two adjacent L poles to jointly rotate towards an openning direction through the connecting rod.

Further, the connecting rod comprises a first linkage portion, a second linkage portion and a third linkage portion; the first linkage portion and the second linkage portion are respectively in linkage connection with the operating mechanisms of the two adjacent L poles; and a driving arm of the third operating mechanism is located between the third linkage portion and the electromagnetic coil.
Further, the third operating mechanism comprises a third lever; the third lever and the connecting rod are assembled coaxially and rotatably; and the driving arm which cooperates with the third linkage portion is disposed at one end of the third lever.
Further, the electric leakage protection electrode is also rotatably assembled with an electric leakage handle mechanism; the electric leakage handle mechanism is in linkage with the third operating mechanism; and the electric leakage handle mechanism is located in a closing position in the absence of an electric leakage fault, and swings to an opening position in the event of an electric leakage fault.
Further, the operating mechanisms of the two L poles adjacent to the electric leakage protection electrode are a first operating mechanism and a second operating mechanism, respectively; the first operating mechanism comprises a first lock buckle provided with a first connecting portion; the first lock buckle is connected to the first linkage portion of the connecting rod through the first connecting portion; the second operating mechanism comprises a second lock buckle provided with a second connecting portion; and the second lock buckle is connected to the second linkage portion of the connecting rod through the second connecting portion.
Further, the first connecting portion is of a boss structure, and the second connecting portion is of a groove structure.
Further, the connecting rod comprises a rotating portion and a U-shaped plate; the rotating portion is provided with a rotary connecting groove, and protrudes in a radial direction of the rotary connecting groove to form a first rod body and a second rod body; the end of the first rod body is bent in a direction parallel to a central axis of the rotary connecting groove to form the rod-shaped third linkage portion; the U-shaped plate serves as the first linkage portion to be connected to the end of the third linkage portion; a convex shaft is disposed to protrude from one side of the second rod body away from the third linkage portion; and the convex shaft serves as the second linkage portion to be parallel to the central axis of the rotary connecting groove.
Further, the rotating portion is of a sector-shaped structure, and a hollow region is provided in the sector-shaped structure.
Further, two circuit breaker poles are provided side by side on both sides of the electric leakage protection electrode, respectively; the two circuit breaker poles on one side of the electric leakage protection electrode are both L poles; and the two circuit breaker poles on the other side of the electric leakage protection electrode are an L pole and an N pole, respectively.
Further, the two L poles located on the same side of the electric leakage protection electrode each comprise a first operating mechanism; the two adjacent first operating mechanisms are in linkage connection through an assembled shaft; and the L pole located on the other side of the electric leakage protection electrode comprises a second operating mechanism, and the N pole comprises an N-pole contact mechanism driven by the second operating mechanism.
According to a circuit breaker of the present invention, a connecting rod is additionally disposed in an electric leakage protection electrode. A third operating mechanism of the electric leakage protection electrode is in linkage connection with operating mechanisms of the two adjacent L poles through the connecting rod. In the absence of an electric leakage fault, the normal closing and opening actions of the circuit breaker will not cause the connecting rod to drive the electric leakage protection electrode to operate. In addition, when any of the L-pole operating mechanisms has a protective action, it can drive the other L-pole operating mechanism for linkage through the connecting rod. In the event of an electric leakage fault, the third operating mechanism drives the two adjacent operating mechanisms to open through the connecting rod, which improves the degree of cooperation between the circuit breaker poles of the circuit breaker.
In addition, an electric leakage handle mechanism of the electric leakage protection electrode swings with the third operating mechanism to indicate whether an electric leakage fault has occurred, which is convenient for observation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a circuit breaker of the present invention;
FIG. 2 are a schematic structural diagram (including an indication window) of a circuit breaker of the present invention;
FIG. 3 is sectional view of a circuit breaker of the present invention;
FIG. 4 is a schematic structural diagram of an L pole in the present invention;
FIG. 5 is a schematic structural diagram of an electric leakage protection electrode in the present invention.
FIG. 6 is a schematic structural diagram (including a circuit broad) of the electric leakage protection electrode in the present invention;
FIG. 7 is a schematic structural diagram of the bottom of the electric leakage protection electrode in the present invention;
FIG. 8 is a schematic structural diagram of a partition plate on one side of the electric leakage protection electrode in the present invention;
FIG. 9 is a schematic structural diagram of a partition plate on the other side of the electric leakage protection electrode in the present invention.
FIG. 10 is a schematic structural diagram of an N pole in the present invention;
FIGs. 11-12 are schematic structural diagrams of an electromagnetic system in the present invention;
FIG. 13 is a schematic structural diagram of a coil assembly in the present invention;
FIG. 14 is sectional view of the coil assembly in the present invention;
FIG. 15 is a schematic diagram of a width of the coil assembly in the present invention;
FIG. 16 is a schematic structural diagram of a first operating mechanism in the present invention;
FIG. 17 is a schematic structural diagram of a second operating mechanism in the present invention;
FIG. 18 is a schematic structural diagram of a connecting rod in the present invention; and
FIG. 19 is a schematic structural diagram of an N-pole arc striking plate in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The specific implementation of a circuit breaker of the present invention will be further described below with reference to the embodiments given in FIGs. 1 to 19. A circuit breaker of the present invention is not limited to the description of the following embodiments.
As shown in FIG. 1, a circuit breaker includes a shell in which a plurality of partition plates 13 is disposed side by side. A space inside the shell is divided into a plurality of mounting cavities by means of the plurality of partition plates 13. Each partition plate 13 includes a separating plate and a side wall disposed along the edge of the separating plate, wherein the side wall is disposed in a direction perpendicular to the separating plate, and the separating plate is located between the two adjacent circuit breaker poles to take a separating effect. Each mounting chamber is equipped with a circuit breaker pole inside to form a multi-pole circuit breaker. The plurality of circuit breaker poles includes at least one N pole 4 and at least two L poles 2, and an electric leakage protection electrode 3 is disposed in at least one mounting cavity between the two circuit breaker poles. The electric leakage protection electrode 3 is separated from the adjacent circuit breaker pole through the partition plate 13. The operating mechanisms which are in linkage connection with each other are disposed in the electric leakage protection electrode 3 and the L pole 2, respectively. The operating mechanisms of the two adjacent circuit breaker poles are in linkage connection. Preferably, the electric leakage protection electrode 3 is disposed between the two L poles 2. The electric leakage protection electrode 3 and the N pole 4 are located on both sides of the same L pole 2, respectively. Of course, the electric leakage protection electrode 3 and the N pole 4 may also be located on both sides of different L pole 2, that is, there are two or more L poles 2 between the electric leakage protection electrode 3 and the N pole 4.
The L pole 2 includes an L-pole wiring terminal 24, a handle mechanism, an operating mechanism, an L-pole contact mechanism and an arc extinguishing system. The L-pole contact mechanism includes an L-pole moving contact 231 and an L-pole static contact 232. The handle mechanism, the operating mechanism and the L-pole moving contact 231 are in linkage connection in sequence, such that the L-pole moving contact 231 moves closer to or away from the L-pole static contact 232 to implement the closing or opening actions, thereby connecting or disconnecting a circuit of the L pole 2. The arc extinguishing system is disposed on one side of the L-pole contact mechanism to extinguish an electric arc generated by breaking. Further, a protection mechanism may also be disposed in the L pole 2. The protection mechanism includes a short-circuit protection mechanism and/or an overload protection mechanism. In the event of a short-circuit fault or an overload fault, the protection mechanism completes a protection action. The N pole 4 includes an N-pole wiring terminal 43, and an N-pole contact mechanism connected to the N-pole wiring terminal 43, wherein the N-pole contact mechanism includes an N-pole moving contact and an N-pole static contact that cooperate with each other. The electric leakage protection mechanism includes a third operating mechanism 31 and an electromagnetic coil 52 of the electromagnetic system 5, which cooperate with each other. In the event of an electric leakage fault, the third operating mechanism 31 is driven to act and drive the L pole 2 and the N pole 4 to open, thereby achieving electric leakage protection.
The present application has an improvement point in that: as shown in FIGs. 5, 8 and 9, a connecting rod 34 is rotationally assembled in the electric leakage protection electrode 3 and located on one side of the electromagnetic coil 52; the third operating mechanism 31 of the electric leakage protection electrode 3 is coordinated with the operating mechanisms of the two L poles 2 adjacent to the electric leakage protection electrode 3 through the connecting rod 34; when the circuit breaker is closed, the connecting rod 34 rotates to a closing position along with the electric leakage protection electrode 3 and the operating mechanisms of the two adjacent L poles 2; when the circuit breaker is opened, the operating mechanisms of the two L poles 2 adjacent to the electric leakage protection electrode 3 rotate towards an opening direction in the linkage of the connecting rod 34, but the third operating mechanism 31 does not act; and in the event of an electric leakage fault, the operating mechanism of the electric leakage circuit breaker drives the operating mechanisms of the two adjacent L poles to jointly rotate towards an opening direction through the connecting rod 34.
Specifically, as shown in FIG. 18, the connecting rod 34 includes a first linkage portion 341, a second linkage portion 342, and a third linkage portion 343. The first linkage portion 341 and the second linkage portion 342 are respectively in linkage connection with the operating mechanisms of the two adjacent L poles 2. A driving portion of the third operating mechanism 31 is located between the electromagnetic coil 52 and the third linkage portion 343. The closing and opening actions of the third operating mechanism 31 are operated by the electric leakage handle mechanism 32. In the event of electric leakage, a driving arm 312 is triggered to rotate the third operating mechanism 31 in an opening direction, and drives the operating mechanisms of the two adjacent L poles 2 to rotate in the opening direction through the connecting rod 34. After the electric leakage fault is released, the circuit breaker is closed, and the connecting rod 34 drives the first operating mechanism 21, the second operating mechanism 22 and the third operating mechanism 31 to close.
Further, the L pole 2 and the electric leakage protection electrode 3 are each provided with an indication device. As shown in FIG. 2, the L pole 2 is provided with an indication window. The indication window 17 indicates a position where the operating mechanism of the L pole 2 is located, and the closed and opened states of the L pole 2 are determined according to the position where the operating mechanism of the L pole 2 is located. The electric leakage protection electrode 3 is provided with an electric leakage handle mechanism 32. Preferably, the electric leakage handle mechanism 32 is an electric leakage indication handle which has an electric leakage indication function and can be used to indicate that an electric leakage fault has occurred. The electric leakage handle mechanism 32 is in linkage connection with the third operating mechanism 31. In the event of an electric leakage fault, the electric leakage handle mechanism 32 swings to an opening position, indicating that an electric leakage fault has occurred; and in the absence of an electric leakage fault, regardless of a closed state or an opened state of the circuit breaker, the electric leakage handle mechanism 32 is located in the closing position, so that whether an electric leakage fault has occurred may be determined according to the position where the electric leakage handle mechanism 32 is located.
As shown in FIGs. 1, 5, 6, and 9, the electric leakage protection electrode 3 further includes a circuit board 36 and an electromagnetic relay 35. The present application has another improvement point in that: a mounting space is reserved at the bottom of the mounting cavity of the electric leakage protection electrode 3, and a notch 18 is formed in the bottom wall of the mounting cavity corresponding to the mounting space and used for the circuit board 36 and the electromagnetic relay 35 to be withdrawn and placed. The notch 18 is enclosed by a cover plate 14 (see FIG. 1). The circuit board 36 and the electromagnetic relay 35 are respectively fixed on an inward side of the cover plate 14 and are correspondingly placed in the mounting space. Preferably, the edge of the mounting space is provided with a clamping structure, and the clamping structure is used to limit the circuit board 36 and the electromagnetic relay 35 in the mounting groove. In this way, the circuit board 36 and the electromagnetic relay 35 can be withdrawn from the bottom for maintenance or replacement, which simplifies the disassembly and assembly steps, and is thus especially suitable for circuit breakers with compact internal space and complex structure.
The electric leakage protection electrode 3 is also provided with a test button loop device 33. Preferably, the test button loop is disposed at the upper part of the electric leakage protection electrode 3, and is used to test whether the electric leakage protection electrode 3 operates normally. The test button loop device 33 includes a test loop and a test button, wherein the test loop takes power from a main line of the circuit breaker, and the test button is in sliding fit with the shell. The test button is pressed in the closed state to connect the test loop, so as to test the functions of the electric leakage protection electrode 3. In the present application, the test loop can adopt a single-break-point or double-break-point structure.
The present application has another improvement point in that: at the N pole 4, the operating mechanism is omitted in the N pole 4, and the N-pole contact mechanism is driven by an operating mechanism of an L pole 2 adjacent to the N pole 4, so that the internal widths of the two mounting cavities used to assemble the N pole 4 and the L pole 2 can be further compressed, thereby reducing the overall width of the circuit breaker.
Further, as shown in FIG. 10, an N-pole arc striking plate 42 which occupies a small space is disposed in the N pole 4. The N-pole arc striking plate 42 is added to improve an arc striking effect of the N pole 4 to avoid the adverse effects of a high-temperature electric arc on the circuit breaker. The N-pole arc striking plate 42 is disposed on one side of the N-pole static contact of the N-pole contact mechanism. A plane where the N-pole arc striking plate 42 is located is parallel to the partition plate 13 of the N pole 4 and can be clung to the partition plate 13 to reduce a gap between the N-pole arc striking plate 42 and the partition plate 13, thereby avoiding the increase in the width of the N pole 4. In the present embodiment, the plane where the N-pole arc striking plate 42 is located being parallel to the partition plate 13 of the N pole 4 refers to being parallel to the separating plate of the partition plate 13 in the N pole 4, rather than the side wall provided at the edge. A first end of the N-pole arc striking plate 42 is connected to the N-pole static contact, and a second end of the N-pole arc striking plate 42 is electrically connected to the electromagnetic system 5 disposed at the other circuit breaker pole, that is, the second end of the N-pole arc striking plate 42 is connected to the coil assembly 51 adjacent to the L pole 2.
A circuit breaker is detailed in conjunction with FIGs. 1 to 19. The circuit breaker includes a shell. The shell includes a base 12 and an upper cover 11 which are covered with each other. Four partition plates 13 are disposed side by side between the base 12 and the upper cover 11 to divide an internal space of the shell into five mounting cavities, and a circuit breaker pole or an electric leakage protection electrode 3 are assembled in each mounting cavity. In the present embodiment, an internal width of the middlemost mounting cavity is 18.8mm and the electric leakage protection electrode 3 is assembled in this mounting cavity, an internal width of each of the two mounting cavities located on one side of the electric leakage protection electrode 3 is 14.4mm, and an L pole 2 is respectively assembled in the two mounting cavities each having an internal width of 14.4mm. In the present embodiment, the two L poles 2 are connected to an A phase line and a B phase line respectively, and a total internal width of the two mounting cavities located on the other side of the electric leakage protection electrode 3 is 16.6mm. In the present embodiment, another L pole 2 is assembled in one mounting cavity close to the electric leakage protection electrode 3, this L pole 2 is connected to a C phase line, the N pole 4 is disposed in the outermost mounting cavity, and the partition plate 13 of the N pole 4 is covered by the upper cover 11. By further adjusting the wall thickness of the partition plate 13 and the wall thickness of the shell, the overall width of the shell is less than or equal to 72mm, which can meet the modulus requirements of four modulus widths, that is, the overall width of the shell is less than or equal to the overall width of 4* 18.
In the present embodiment, the two L poles 2 which are disposed side by side on one side of the electric leakage protection electrode 3 are identical in structure. As shown in FIG. 4, each L pole 2 includes L-pole wiring terminals 24 disposed at both ends of the L pole 2, respectively. A handle mechanism, a first operating mechanism 21, an L-pole contact mechanism and an arc extinguishing system are disposed between the L-pole wiring terminals 24, wherein the handle mechanism is in linkage connection with the first operating mechanism 21 and is disposed at the upper part of the L pole 2; an L-pole moving contact 231 of the L-pole contact mechanism is connected to the lower part of the first operating mechanism 21; an L-pole static contact 232 of the L-pole contact mechanism and the arc extinguishing system are disposed in the middle of the L pole 2; a coil assembly 51 of the electromagnetic system 5 is disposed between the handle mechanism and the arc extinguishing system; and one end of the coil assembly 51 is opposite to the first operating mechanism 21. In the event of a short-circuit fault, the coil assembly 51 drives the first operating mechanism 21 to trip. An overload protection mechanism is disposed between the L-pole moving contact 231 and one L-pole wiring terminal 24, and a movable end of the overload protection mechanism is opposite to the first operating mechanism 21.
Specifically, as shown in FIG. 16, the first operating mechanism 21 includes a first lever, a first jump buckle, and a first lock buckle 211, wherein the first lever is rotatably assembled in the mounting cavity, and the first jump buckle and the first lock buckle 211 are rotatably assembled on the first lever; the first jump buckle is in linkage connection with the handle mechanism through the connecting rod 34; and the first jump buckle is in locking fit with one end of the first lock buckle 211, and the other end of the first lock buckle 211 is opposite to one end of the coil assembly 51 and is also connected to a tripping hook which cooperates with the overload protection mechanism. In the event of an overload fault, the movable end of the overload protection mechanism drives the first lock buckle 211 to rotate through the tripping hook, thereby achieving overload protection. Further, the first operating mechanism 21 may also be provided with a first resetting member, wherein the first resetting member is connected to the first lock buckle 211, and the first resetting member cooperates with the shell to provide a resetting force for the first lock buckle 211. In the present embodiment, the first operating mechanisms 21 of the two L poles 2 which are arranged side by side are in linkage connection through an assembled shaft 25 (see FIG. 3). The first operating mechanism 21 adjacent to the electric leakage protection electrode 3 is provided with a boss structure as the first connecting portion 212, and the first connecting portion 212 passes through the partition plate 13 into the electric leakage protection electrode 3 and is in linkage connection with the connecting rod 34.
In addition, an indication window 17 is disposed at the upper part of the shell corresponding to the first operating mechanism 21. An indication member which is in linkage with the first operating mechanism 21 is disposed in the indication window 17. The indication member correspondingly displays that the first operating mechanism 21 is in an opened state or a closed state. For example, the indication member may be a push plate which is slidably assembled in the indication window 17. The push plate is pushed by the first operating mechanism 21, and the push plate is provided with a corresponding identifier, for example, red indicates the closed state, and green indicates the opened state.
In the present embodiment, as shown in FIGs. 11 to 15, the electromagnetic system 5 is of an integrated structure. The electromagnetic system 5 includes a plurality of coil assemblies 51 which is disposed side by side. The coil assembly 51 disposed at the L pole 2 is located between the handle mechanism and the arc extinguishing system, and both ends of the coil assembly 51 are connected to the L-pole static contact 232 and one L-pole wiring terminal 24, respectively. Preferably, the width of the coil assembly 51 is 13.4mm (that is, "a" in FIG. 15 represents the width of the coil assembly 51, which may also be understood as the outer diameter of the coil assembly 51). Compared with the existing coil assembly 51 having a width of 14.2mm, a coil 513 which is wound at a reduced wire diameter has a smaller diameter, so that a spacing between the coil assembly 51 and the partition plate 13 is widened. Meanwhile, a thickened portion is formed in an area of the partition plate 13 corresponding to the coil assembly 51, so that the thickness of the partition plate 13 between the two adjacent coil assemblies 51 is also increased, which is conducive to reducing the temperature rise on both sides of the circuit breaker. Specifically, the wall thickness of the normal partition plate 13 is 1.0mm to 1.4mm, and the thickened portion correspondingly increase the thickness by 0.4mm, so that the wall thickness of an area of the partition plate 13 corresponding to the coil assembly 51 reaches 1.8mm. Preferably, the thickened portion forms a strip-shaped thickened portion formed along both ends of the coil assembly 51 and one edge on one side facing the arc extinguishing system. The width of the strip-shaped thickened portion in each section is <0.6mm (the width of the strip-shaped thickened portion refers to a width in a plane direction of the separating plate of the partition plate 13, which is different from the overall width direction of the circuit breaker, and the thickening direction of the thickened portion is consistent with the width direction of the circuit breaker). In addition, the smaller width of the coil assembly 51 makes the section at one end of the coil assembly 51 smaller, and also makes a surface in contact with the side wall of the mounting cavity small, so that there are more empty portion on the side wall of the mounting cavity between the handle mechanism and the coil assembly 51, and the side wall of the mounting cavity here can be thickened accordingly. Of course, the smaller diameter of the coil assembly 51 does not affect its performances, which can be achieved by using a flat coil 53, rematching the number of turns and width of the coil 513, etc.
As shown in FIGs. 12 to 15, the coil assembly 51 includes a bracket 511, a coil skeleton 512, a coil 513, a moving iron core 514, a static iron core 515, a push rod 516 and a reset spring 517. The coil skeleton 512 is assembled on the bracket 511. The outer side of the coil skeleton 512 is wound with the coil 513. The moving iron core 514 and the static iron core 515 are disposed at opposite ends of the coil skeleton 512, respectively. A through hole is formed in the middle of the static core 515. The push rod 516 penetrates through the through hole of the static iron core 515. One end of the push rod 516 is connected to the moving iron core 514, and the other end of the push rod 516 is opposite to the first lock buckle 211 of the first operating mechanism 21. The reset spring 517 is disposed to sleeve the outside of the push rod 516 and is located inside the coil skeleton 512. Both ends of the reset spring 517 prop against the moving iron core 514 and the static iron core 515, respectively. In the event of a short-circuit fault, the coil 513 drives the moving iron core 514 to act, so that the other end of the push rod 516 triggers the first lock buckle 211 to rotate, thereby making the first operating mechanism 21 tripped.
The L-pole static contact 232 connected to the coil assembly 51 includes an L-pole static contact plate, a contact point and an L-pole arc striking plate 2322. Preferably, the L-pole static contact plate and the bracket 511 of the coil assembly 51 are integrally formed. One end of the L-pole static contact plate is bent and extends obliquely in a direction close to the coil assembly 51 to form an inclined section 2321. One wiring terminal 5131 of the coil 513 extends obliquely and is connected to the inclined section 2321, so that only one welding point appears between the coil 513 and the L-pole static contact plate. Meanwhile, a current flows directly into the coil 513 through the L-pole static contact plate, which shortens a distance of the current flowing through the coil assembly 51, effectively reduces the temperature rise at the position of the coil assembly 51, and is conducive to reducing the temperature rise on the side of a product. The contact point is disposed at one side of the L-pole static contact plate away from the coil assembly 51, and the other end of the L-pole static contact plate is bent back in a direction close to the bracket 511 to form the L-pole arc striking plate 2322.
In the present embodiment, the L poles 2 located on both sides of the electric leakage protection electrode 3 are similar. The L pole 2 separately disposed on one side of the electric leakage protection electrode 3 includes the same L-pole wiring terminal 24 as the other two L poles 2, a handle mechanism, an L-pole contact mechanism, an arc extinguishing chamber and an overload protection mechanism, and the assembly position is the same as the position of the other two L poles 2. Another coil assembly 51 of the electromagnetic system 5 is disposed between the handle mechanism and the arc extinguishing system. The side wall (that is, the partition plate 13, specifically the separating plate of the partition plate 13) of the mounting cavity between the handle mechanism and the arc extinguishing system is also thickened to form the thickened portion to reduce the temperature rise on the side. The other end of the coil assembly 51 and the L-pole static contact 232 have the same composition and connection method as the other two L poles 2.
Unlike the other two L poles 2, as shown in FIGs. 9 and 17, a second operating mechanism 22 is disposed on one side of the handle mechanism. The second operating mechanism 22 includes a second lever rotatably assembled in the mounting cavity. A second jump buckle, a second lock buckle 221 and a second resetting member 222 are rotatably assembled on the second lever. The second jump buckle is in linkage with the handle mechanism, and the second jump buckle is in locking fit with one end of the first lock buckle 211. One end of the coil assembly 51 is opposite to the other end of the second lock buckle 221, and a tripping hook which cooperates with the overload protection mechanism is also disposed at the other end of the second lock buckle 221. The second resetting member 222 is in linkage with the second lock buckle 221. The second resetting member 222 cooperates with the side wall of the mounting cavity to provide a resetting force for the second lock buckle 221. In addition, the second resetting member 222 is provided with a groove structure as the second connecting portion 223. Of course, the second operating mechanism 22 may adopt the same structure as the first operating mechanism 21.
Further, an indication window 17 is also provided at the upper part of the L pole 2 provided with a second operating mechanism 22. The indication window 17 is the same as the indication windows 17 of the other two L poles 2 and used for indicating whether the second operating mechanism 22 is in the closing position or the opening position.
In the present embodiment, as shown in FIG. 1 and FIG. 10, the N pole 4 is disposed in the leftmost mounting cavity. That is, the N pole 4 and the electric leakage protection electrode 3 are located on both sides of the L pole 2 provided with the second operating mechanism 22, respectively. The N-pole contact mechanism of the N pole 4 is driven by the second operating mechanism 22, so that the mounting cavity of the N pole 4 can be further compressed.
As shown in FIG. 10 and FIG. 19, the N-pole contact mechanism includes a N-pole moving contact and an N-pole static contact which cooperate with each other, wherein the N-pole moving contact is in linkage connection with the second lever, the N-pole static contact is disposed in the middle of the N pole 4, an N-pole arc striking plate 42 is disposed on one side of the N-pole contact mechanism, the N-pole arc striking plate 42 is parallel and close to the partition plate 13 of the N pole 4, and a first end of the N-pole arc striking plate 42 is connected to the N-pole static contact. Preferably, the first end of the N-pole arc striking plate 42 is bent to form an N-pole static contact plate 421. The contact point is provided on one side of the N-pole static contact plate 421 opposite to the N-pole moving contact to form the N-pole static contact. A plane where the N-pole static contact plate 421 is located is perpendicular to a plane where the N-pole arc striking plate 42 is located, a plane where the N-pole arc striking plate 42 is located is perpendicular to a width direction of the circuit breaker, and a plane where the N-pole static contact plate 421 is located is parallel to the width direction of the circuit breaker. A second end of the N-pole arc striking plate 42 is connected to the coil assembly 51 adjacent to the L pole 2 through a wire 6. Further, the partition plate 13 of the N pole 4 is provided with a positioning groove 15 for locating the N-pole arc striking plate 42. As shown in FIG. 10, the positioning groove 15 is inclined so that one end of the positioning groove 15 is located on one side of the N-pole static contact, and a threading hole is formed in the other end of the positioning groove 15; and the threading hole penetrates through the partition plate 13 corresponding to the N pole 4 on one side of the handle mechanism, that is, the positioning groove 15 inclines and extends from a position corresponding to the N-pole static contact upward to a position close to the handle mechanism.
It should be noted that due to small widths of the two mounting cavities, in which the N pole 4 and the L pole 2 provided with the second operating mechanism 22 are assembled, the N-pole wiring terminal 43 and the L-pole wiring terminal 24 may occupy both sides of the electric leakage protection electrode 3. At this time, the L-pole wiring terminal 24 is located in the electric leakage protection electrode 3, and the N-pole wiring terminals 43 are located at both ends of the L pole 2 and the N pole 4.
A structure of an N-pole arc striking plate 42 is provided in conjunction with FIG. 19. The N-pole arc striking plate 42 includes a strip-shaped plate parallel to the partition plate 13 of the N pole 4. The side of the strip-shaped plate near the first end extends outward and is twisted to form the N-pole static contact plate 421 opposite to the side of the strip-shaped plate. The N-pole static contact plate 421 is perpendicular to the partition plate 13 of the N pole 4. The contact point is provided on the plate surface on one side of the N-pole static contact plate 421 away from the side edge of the strip-shaped plate to form the N-pole static contact. A welding groove 422 is formed in the second end of the strip-shaped plate. A height difference between the bottom surface of the welding groove 422 and the surface of the partition plate 13 of the N pole 4 is 1.3mm, and a depth of the positioning groove 15 is 2.4mm. The wire 6 is welded within the welding groove 422, and the other end of the wire 6 is connected to the coil assembly 51 through the threading hole. In the present embodiment, the N-pole arc striking plate 42 allows the narrow N pole to meet the closed and opened functions, and has a small electric arc that may be introduced into a triangular area on the lower right side of the partition plate 13 in FIG. 10.
As shown in FIGs. 1-3, and 5-9, the electric leakage protection electrode 3 is disposed in the middlemost mounting cavity, and includes an electric leakage handle mechanism 32, a third operating mechanism 31, a connecting rod 34, an electromagnetic coil 52 in the electromagnetic system 5, a circuit board 36, an electromagnetic relay 35 and a test button loop. As shown in FIG. 5, the electric leakage handle mechanism 32 is in linkage connection with the third operating mechanism 31 and disposed at the upper part of the electric leakage protection electrode 3, and the electromagnetic coil 52 is disposed below the electric leakage handle mechanism 32 and is located on one side of the third operating mechanism 31. In the present embodiment, the electromagnetic coil 52 is disposed side by side with a plurality of coil assemblies 51. The electromagnetic coil 52 is separated from the adjacent coil assembly 51 through the partition plate 13. Therefore, the electromagnetic coil 52 and the coil assembly 51 are located at the same positions in each mounting cavity, and the electromagnetic coil 52, the circuit board 36 and the electromagnetic relay 35 jointly drive the third operating mechanism 31.
As shown in FIG. 5, the third operating mechanism 31 includes a third lever 311 which is assembled rotatably, wherein the third lever 311 is linkage connection with the electric leakage handle mechanism 32; a driving arm 312 is disposed at one end of the third lever 311; the connecting rod 34 and the third lever 311 are assembled coaxially and rotatably; and the third lever 311 is in linkage with the operating mechanisms of the two adjacent L poles 2 through the connecting rod 34, that is, the first lever, the second lever and the third lever 311 are in linkage connection together through the connecting rod 34.
A specific structure of a connecting rod 34 is provided in conjunction with FIG. 18. The connecting rod 34 includes a rotating portion 344 and a U-shaped plate. In FIG. 18, the rotating portion 344 is of a sector-shaped structure. The sector-shaped structure is provided with a hollow region to reduce the overall weight of the connecting rod 34. A rotary connecting groove is formed in the circle center of the rotating portion 344. A first rod body 34a and a second rod body 34b are formed by radial protrusion from the rotary connecting groove. The end of the first rod body 34a is bent in a direction parallel to the central axis of the rotary connecting groove to form a rod-like third linkage portion 343. A driving arm 312 of the third lever 311 is located between the electromagnetic coil 52 and the third linkage portion 343, and an action mechanism is disposed between the driving arm 312 and the electromagnetic relay 35. The electromagnetic relay rotates the driving arm 312 through the action mechanism. The U-shaped plate is connected as the first linkage portion 341 to the end of the third linkage portion 343. The first connecting portion 212 of the first lock buckle 211 is clamped in a hollow region of the U-shaped plate. A convex shaft is disposed to protrude from one side of the second rod body 34b away from the third linkage portion 343. The convex shaft as the second linkage portion 342 is parallel to the central axis of the rotary connection groove. The second linkage portion 342 passes through the partition plate 13 and is in pluggable fit with the second connecting portion 223 of the second resetting member 222.
When the circuit breaker is closed, the operating mechanism of the L pole 2 rotates clockwise, so that the connecting rod 34 rotates clockwise with the operating mechanism of the L pole 2. Specifically, in the present embodiment, the first operating mechanism 21 and the second operating mechanism 22 of the two L poles 2 adjacent to the electric leakage protection electrode 3 rotate in a closing direction, so that the connecting rod 34 rotates to the closing position under the jointed cooperation of the first connecting portion 212 and the first linkage portion 341, as well as the second connecting portion 223 and the second linkage portion 342. The connecting rod 34 rotates to the opening position in two cases. In the first case where an electric leakage fault has not occurred, the third operating mechanism 31 at this time is in the closing position, and the driving arm 312 does not cooperate with the third linkage portion 343 when the connecting rod 34 rotates to the closing position, without affecting the third operating mechanism 31. In the second case where an electric leakage fault is released from the circuit breaker, the third operating mechanism 31 at this time is in the opened state, the driving arm 312 cooperates with the third linkage portion 343 when the connecting rod 34 rotates to the closing position, so as to simultaneously drive the first operating mechanism 21, the second operating mechanism 22 and the third operating mechanism 31 in the closing position.
When the circuit breaker is opened normally, i.e., is opened in the absence of an electric leakage fault, the operating mechanism of the L pole 2 rotates counterclockwise, so that the two L poles 2 adjacent to the electric leakage protection electrode 3 rotate in the opening direction under the linkage of the connecting rod 34. At this time, the connecting rod 34 is only aimed to make the operating mechanisms of the two L poles 2 linked, and the connecting rod 34 rotates in the opening direction along with the operating mechanisms of the L poles 2, but cannot drive the third operating mechanism 31. Therefore, the third operating mechanism 31 has no action. In the present embodiment, when the two L poles 2 on the same side of the electric leakage protection electrode 3 is opened, the first lock buckle 211 of the first operating mechanism 21 rotates counterclockwise, and the connecting rod 34 rotates counterclockwise due to the cooperation of the first connecting portion 212 and the first linkage portion 341. At this time, the second linkage portion 342 and the second connecting portion 223 cooperate to drive the second operating mechanism 22 to rotate in the opening direction. Similarly, when a single L pole 2 located on one side of the electric leakage protection electrode 3 is opened, the second operating mechanism 22 also drives the first operating mechanism 21 through the connecting rod 34 to rotate in the opening direction. However, in the process of opening rotation of the L pole 2, the third linkage portion 343 does not trigger the driving arm 312. Therefore, the third operating mechanism 31 of the electric leakage protection electrode 3 has no action.
In the event of an electric leakage fault, the operating mechanism of the electric leakage circuit breaker drives the operating mechanisms of the two adjacent L poles 2 to rotate together in the opening direction through the connecting rod 34. The specific process is as follows: in the event of an electric leakage fault, the driving arm 312 rotates and drives the connecting rod 34 to rotate counterclockwise by triggering the third linkage portion 343, the first linkage portion 341 and the first connection portion 212, as well as the second linkage portion 342 and the second connecting portion 223 cooperate at the same time, driving the first operating mechanism 21 and the second operating mechanism 22 to rotate counterclockwise at the same time for breaking contact.
It should be noted that, in the present embodiment, the first connecting portion 212 is disposed at the lower part of the first lock buckle 211, and a second connecting portion 223 is disposed on the second resetting member 222, so that the first linkage portion 341 of the connecting rod 341 is lower than the second linkage portion 342, but the connecting rod 34 is not limited to the above shape. In addition, the shapes of the first linkage portion 341, the second linkage portion 342 and the third linkage portion 343 may also be adjusted accordingly.
A mounting space is reserved at one side of the electromagnetic coil 52. In the present embodiment, as shown in FIGs. 6 to 9, the mounting space is located at the lower part of the electric leakage protection electrode 3, that is, below the third operating mechanism 31. The bottom wall of the mounting cavity is provided with a notch 18 opposite to the mounting space. The notch is enclosed by a cover plate 14. The circuit board 36 and the electromagnetic relay 35 are fixed on an inward side of the cover plate 14 and correspondingly placed in the mounting space, and a clamping structure is provided at the edge of the mounting space. The circuit board 36 and the electromagnetic relay 35 are limited within the mounting space through the clamping structure. As shown in FIGs. 6 to 8, the clamping structure includes a first clamping groove 161, a second clamping groove 162 and at least one baffle 163, wherein the first clamping groove 161 is engaged with the side edge of the circuit board 36. The baffle 163 is used to position the circuit board 36. Three baffles 163 are provided in FIG. 6 and FIG. 8. Each baffle 163 is used to position the three side edges of the circuit board 36, and the other side edge of the circuit board 36 is fixedly connected to the cover plate 14. Two opposing baffles 163 form a first assembly cavity in the mounting space, and the remaining portion of the mounting space forms a second assembly cavity. In the present embodiment, as shown in FIG. 7, the size of the first assembly cavity matches the size of the circuit board 36, so that the first mounting cavity and the second mounting cavity which are stacked are independent of each other. In addition, the notch 18 corresponding to the mounting space may also be adjusted according to the sizes of the first mounting cavity and the second mounting cavity.
A test button loop device 33 is also disposed at the electric leakage protection electrode 3. The test button circuit device 33 includes a test loop and a test button. The electric leakage test button loop takes power from a main line of the circuit breaker. The test button is slidably assembled in a button hole formed in the upper part of the electric leakage protection electrode 3. Preferably, the button hole and the electric leakage handle mechanism 32 are respectively provided at the left and right ends of the upper part of the electric leakage protection electrode 3, respectively. In the closed state of the circuit breaker, the test button is pressed to operate the test loop to switch on or switch off. The test loop is disposed along the upper part and side edges of the electric leakage protection electrode 3 to save the space and facilitate wiring. The test loop can adopt a single-break-point structure, a double-break-point structure and other structures.
We have made further detailed description of the present invention mentioned above in combination with specific preferred embodiments, but it is not deemed that the specific embodiments of the present invention is only limited to these descriptions. A person skilled in the art can also, without departing from the concept of the present invention, make several simple deductions or substitutions, which all be deemed to fall within the protection scope of the present invention.

Claims

A circuit breaker, comprising a shell, a plurality of circuit breaker poles is disposed inside the shell side by side; the plurality of circuit breakers includes at least two L poles (2), and an electric leakage protection electrode (3) is disposed between the two L poles (2); an electromagnetic coil (52) of an electromagnetic system (5) is disposed on one side of a third operating mechanism (31) of the electric leakage protection electrode (3); wherein a connecting rod (34) is rotatably assembled on one side of the electromagnetic coil (52); the third operating mechanism (31) is and coordinated with operating mechanisms of the two adjacent L poles (2) through the connecting rod (34);
when the circuit breaker is closed, the connecting rod (34) rotates to a closing position along with the electric leakage protection electrode (3) and the operating mechanisms of the two adjacent L poles (2);

when the circuit breaker is opened, the connecting rod (34) rotates towards an opening direction along with the operating mechanisms of the two L poles adjacent to the electric leakage protection electrode (3), but the third operating mechanism (31) does not act; and

in the event of an electric leakage fault, the third operating mechanism (31) drives the operating mechanisms of the two adjacent L poles (2) to jointly rotate towards an openning direction through the connecting rod (34).
The circuit breaker according to claim 1, wherein the connecting rod (34) comprises a first linkage portion (341), a second linkage portion (342) and a third linkage portion (343); the first linkage portion (341) and the second linkage portion (342) are respectively in linkage connection with the operating mechanisms of the two adjacent L poles (2); and a driving arm (312) of the third operating mechanism (31) is located between the third linkage portion (343) and the electromagnetic coil (52).
The circuit breaker according to claim 2, wherein the third operating mechanism (31) comprises a third lever (311); the third lever (311) and the connecting rod (34) are assembled coaxially and rotatably; and the driving arm (312) which cooperates with the third linkage portion (343) is disposed at one end of the third lever (311).
The circuit breaker according to claim 2 or 3, wherein the electric leakage protection electrode (3) is also rotatably assembled with an electric leakage handle mechanism (32); the electric leakage handle mechanism (32) is in linkage with the third operating mechanism (31); and the electric leakage handle mechanism (32) is located in a closing position in the absence of an electric leakage fault, and swings to an opening position in the event of an electric leakage fault.
The circuit breaker according to claim 2, wherein the operating mechanisms of the two L poles (2) adjacent to the electric leakage protection electrode (3) are a first operating mechanism (21) and a second operating mechanism (22), respectively; the first operating mechanism (21) comprises a first lock buckle (211) provided with a first connecting portion (212); the first lock buckle (211) is connected to the first linkage portion (341) of the connecting rod (34) through the first connecting portion (212); the second operating mechanism (21) comprises a second lock buckle (211) provided with a second connecting portion (223); and the second lock buckle (211) is connected to the second linkage portion (342) of the connecting rod (34) through the second connecting portion (223).
The circuit breaker according to claim 5, wherein the first connecting portion (212) is of a boss structure, and the second connecting portion (223) is of a groove structure.
The circuit breaker according to claim 2, wherein the connecting rod (34) comprises a rotating portion (344) and a U-shaped plate; the rotating portion (344) is provided with a rotary connecting groove, and protrudes in a radial direction of the rotary connecting groove to form a first rod body (34a) and a second rod body (34b); the end of the first rod body (34a) is bent in a direction parallel to a central axis of the rotary connecting groove to form the rod-shaped third linkage portion (343); the U-shaped plate serves as the first linkage portion (341) to be connected to the end of the third linkage portion (343); a convex shaft is disposed to protrude from one side of the second rod body (34b) away from the third linkage portion (343); and the convex shaft serves as the second linkage portion (342) to be parallel to the central axis of the rotary connecting groove.
The circuit breaker according to claim 7, wherein the rotating portion (344) is of a sector-shaped structure, and a hollow region is provided in the sector-shaped structure.
The circuit breaker according to claim 1, wherein two circuit breaker poles are provided side by side on both sides of the electric leakage protection electrode (3), respectively; the two circuit breaker poles on one side of the electric leakage protection electrode (3) are both L poles (2); and the two circuit breaker poles on the other side of the electric leakage protection electrode (3) are an L pole (2) and an N pole (4), respectively.
The circuit breaker according to claim 9, wherein the two L poles (2) located on the same side of the electric leakage protection electrode (3) each comprise a first operating mechanism (21); the two adjacent first operating mechanisms (21) are in linkage connection through an assembled shaft (25); and the L pole (2) located on the other side of the electric leakage protection electrode (3) comprises a second operating mechanism (22), and the N pole (4) comprises an N-pole contact mechanism driven by the second operating mechanism (22).