CN218896604U

CN218896604U - Circuit breaker

Info

Publication number: CN218896604U
Application number: CN202223201718.6U
Authority: CN
Inventors: 张红伟; 张彦阳; 沈国峰; 徐�明; 任昌宾; 陈晓军; 阳丹红
Original assignee: Zhejiang Tengen Electric Co Ltd
Current assignee: Zhejiang Tengen Electric Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-04-21
Anticipated expiration: 2032-11-30

Abstract

The utility model relates to the technical field of circuit breakers, in particular to a circuit breaker. The arc-extinguishing device comprises a shell, an arc-isolating plate, an arc-extinguishing chamber, a magnetic conduction plate and a circuit board; the arc-shield plate is arranged in the shell; the arc extinguishing chamber is arranged in the shell and is positioned at one side of the arc barrier; the projection area of the arc-shield plate on the shell is larger than the projection area of the arc-extinguishing chamber on the shell; the magnetic conduction plate is arranged in the shell and is positioned at the other side of the arc-stop plate; the circuit board is arranged in the shell and is positioned at one side of the magnetic conduction plate away from the arc-stop plate. The arc-isolating plate of the circuit breaker provided by the utility model can completely cover one side of the arc-extinguishing chamber, and prevent the arc from flying out to burn the circuit board.

Description

Circuit breaker

Technical Field

The utility model relates to the technical field of circuit breakers, in particular to a circuit breaker.

Background

The circuit breaker is used for switching on and off the current under the normal loop condition; a mechanical switching device which carries a prescribed overcurrent for a prescribed period of time and is capable of switching on and off a current under abnormal loop conditions such as various short-circuit conditions.

The circuit breaker generally comprises a magnetic conduction plate, wherein the magnetic conduction plate can rapidly introduce an arc generated between the moving contact and the fixed contact into an arc extinguishing grid sheet, so that the arc extinguishing effect of the circuit breaker is improved, and the circuit breaker is matched with the magnetic conduction plate to be installed and positioned and generally comprises an arc barrier plate. In the prior art, the arc-isolating plate is abutted with the arc-extinguishing chamber, and a gap is easily generated between the arc-isolating plate and the arc-extinguishing chamber in the carrying, transporting and installing processes of the circuit breaker, so that the condition that an arc flies out of a burned circuit board is caused.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to overcome the defect that in the prior art, a gap is easy to generate between the arc-isolating plate and the arc-extinguishing chamber, so that the arc flies out to burn the circuit board, thereby providing the circuit breaker which can completely cover one side of the arc-extinguishing chamber and prevent the arc from flying out to burn the circuit board.

In order to solve the problems, the utility model provides a circuit breaker, which comprises a shell, an arc-isolating plate, an arc extinguishing chamber, a magnetic conduction plate and a circuit board; the arc-shield plate is arranged in the shell; the arc extinguishing chamber is arranged in the shell and is positioned at one side of the arc barrier; the projection area of the arc-isolating plate on the shell is larger than the projection area of the arc-extinguishing chamber on the shell; the magnetic conduction plate is arranged in the shell and positioned at the other side of the arc-stop plate; the circuit board is arranged in the shell and is positioned at one side of the magnetic conduction plate away from the arc-stop plate.

The circuit breaker provided by the utility model is characterized in that one end of one side of the arc barrier is provided with the first groove, and the arc extinguishing chamber is arranged in the first groove.

The circuit breaker provided by the utility model further comprises a fixed contact and a moving contact, wherein the fixed contact is connected to the other end of one side of the arc-stop plate, and the moving contact is movably connected to the other end of one side of the arc-stop plate; the magnetic conduction plate is arranged on the other side of the flash barrier and is close to the position of the fixed contact and the movable contact.

According to the circuit breaker provided by the utility model, the groove wall of one side of the first groove, which is away from the moving contact, is provided with at least one air outlet.

The circuit breaker provided by the utility model is characterized in that the other side of the arc-shaped baffle plate is provided with a second groove, and the magnetic conduction plate is arranged in the second groove.

According to the circuit breaker provided by the utility model, the second groove is arranged at one end close to the fixed contact and the moving contact, and the second groove and the first groove are arranged in a staggered manner, so that a step-shaped structure is formed.

The circuit breaker provided by the utility model has the advantages that the first groove is a through groove with openings at two ends; the circuit breaker also comprises a first arc striking piece and a second arc striking piece; the first arc striking piece comprises a first arc striking part positioned at the opening at one end of the first groove and a second arc striking part which extends from one end of the first arc striking part, which is close to the fixed contact, to the side part of the fixed contact; the second arc striking piece comprises a third arc striking part positioned at the opening of the other end of the first groove and a fourth arc striking part which extends from one end of the third arc striking part, which is close to the moving contact, to the side part of the moving contact.

The circuit breaker provided by the utility model further comprises a static support fixedly connected in the shell and fixedly connected with the static contact.

The static bracket of the circuit breaker provided by the utility model comprises a first connecting section and a second connecting section; the first connecting section is fixedly connected with the fixed contact; the second connecting section is fixedly connected in the shell, one end of the first connecting section is connected with one end of the second connecting section, and the other end of the second connecting section extends in a direction away from the arc extinguishing chamber; an included angle is formed between the first connecting section and the second connecting section; the junction of first linkage segment and second linkage segment is equipped with the connecting hole, and the one end of second striking portion passes the connecting hole to be fixed in the one side of first linkage segment back to the stationary contact.

The circuit breaker provided by the utility model further comprises a positioning structure, wherein the positioning structure comprises a first positioning hole, a second positioning hole, a third positioning hole and a positioning column; the first positioning hole is arranged on the shell; the second positioning hole is arranged on the magnetic conduction plate; the third positioning hole is arranged on the circuit board; the positioning column protrudes out and is arranged on one side of the arc-stop plate, which faces the magnetic guide plate, and the positioning column is suitable for passing through the second positioning hole and the third positioning hole to be in positioning connection with the first positioning hole.

The utility model has the following advantages:

1. the utility model provides a circuit breaker, which comprises a shell, an arc-isolating plate, an arc-extinguishing chamber and a magnetic conduction plate, wherein the arc-extinguishing chamber is arranged on the shell; the arc-shield plate is arranged in the shell; the arc extinguishing chamber is arranged in the shell and is positioned at one side of the arc barrier; the projection area of the arc-isolating plate on the shell is larger than the projection area of the arc-extinguishing chamber on the shell; the magnetic conduction plate is arranged in the shell and positioned at the other side of the arc-stop plate; the circuit board is arranged in the shell and is positioned at one side of the magnetic conduction plate away from the arc-stop plate.

The arc-isolating plate is positioned between the magnetic conduction plate and the arc-extinguishing chamber and completely covers one side of the arc-extinguishing chamber, so that the electric arc is effectively isolated from the magnetic conduction plate and the circuit board, and the electric arc is prevented from flying out to burn the magnetic conduction plate or the circuit board.

2. According to the circuit breaker provided by the utility model, the groove wall of one side of the first groove, which is away from the moving contact, is provided with at least one air outlet.

The static contact and the moving contact flow under larger breaking current, the ambient temperature rises, larger atmospheric pressure can be generated, the transfer of the arc to the arc extinguishing chamber is not facilitated, the arrangement of the air outlet can prevent a closed cavity from being formed between the arc baffle and the arc extinguishing chamber, so that the balance of the air pressure inside and outside the first groove is ensured, the arc can be quickly transferred to the arc extinguishing chamber, the arc extinguishing effect is improved, and the arc backflow and the reburning burning of the contact are prevented.

3. According to the circuit breaker provided by the utility model, the second groove is arranged at one end close to the fixed contact and the moving contact, and the second groove and the first groove are arranged in a staggered manner, so that a step-shaped structure is formed.

The second groove and the first groove are arranged in a staggered mode, the arc extinguish chamber is located in the first groove, the moving contact is located at the position opposite to the V-shaped groove of the arc extinguish chamber, the arc is guided to enter the arc extinguish chamber, and the arc extinguish effect is enhanced.

4. The utility model also provides a positioning structure, which comprises a first positioning hole, a second positioning hole, a third positioning hole and a positioning column; the first positioning hole is arranged on the shell; the second positioning hole is arranged on the magnetic conduction plate; the third positioning hole is arranged on the circuit board; the positioning column protrudes out and is arranged on one side of the arc-stop plate, which faces the magnetic guide plate, and the positioning column is suitable for passing through the second positioning hole and the third positioning hole to be in positioning connection with the first positioning hole.

The magnetic conduction plate and the circuit board are fixed between the arc-isolation plate and the shell through the positioning column, the structure is simple, the assembly is easy, the layout is reasonable, and the reliability of connection between the arc-isolation plate of the circuit breaker and the magnetic conduction plate and the circuit breaker shell can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic partial structure of a circuit breaker of the present utility model;

FIG. 2 shows a partial schematic view of the structure with the housing removed and the first arcing component;

FIG. 3 shows a partial schematic view of the structure with the housing and static mount removed;

FIG. 4 is a schematic structural diagram showing the connection relationship of a magnetic conductive plate, an arc shield, a first arc striking member and a second arc striking member;

FIG. 5 shows a schematic view of the structure of the arc shield;

FIG. 6 shows a schematic structural view of a positioning structure;

fig. 7 shows a schematic structural view of the static bracket.

Reference numerals illustrate:

1. a housing; 2. arc-shield plate; 21. a first groove; 211. an air outlet; 22. a second groove; 221. a first avoidance port; 222. a second avoidance port; 223. a limiting plate; 3. an arc extinguishing chamber; 4. a magnetic conductive plate; 5. a stationary contact; 6. a moving contact; 7. a first arc striking member; 71. a first arc striking part; 72. a second arc striking part; 8. a second arc striking member; 81. a third arc striking part; 82. a fourth arc striking part; 9. a static support; 91. a first connection section; 92. a second connection section; 93. a connection hole; 101. a second positioning hole; 102. positioning columns; 11. and a circuit board.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

As shown in fig. 1 to 7, in the present embodiment, there is provided a circuit breaker including a case 1, an arc-shield plate 2, an arc extinguishing chamber 3, a magnetic conduction plate, and a circuit board; the arc barrier 2 is arranged in the shell 1; the arc extinguishing chamber 3 is arranged in the shell 1 and is positioned at one side of the arc barrier 2; the projection area of the arc-shield plate 2 on the shell 1 is larger than the projection area of the arc-extinguishing chamber 3 on the shell 1; the magnetic conduction plate 4 is arranged in the shell 1 and positioned at the other side of the arc barrier 2; the circuit board 11 is disposed in the housing 1 and is located at a side of the magnetic conductive plate 4 away from the arc-shielding plate 2.

The arc-shield plate 2 of the embodiment can be integrally formed, and the arc-shield plate 2 is positioned between the magnetic conduction plate 4 and the arc-extinguishing chamber 3 to completely cover one side of the arc-extinguishing chamber 3, so that the electric arc is effectively isolated from the magnetic conduction plate 4 and the circuit board 11, and the electric arc is prevented from flying out to burn the magnetic conduction plate 4 and the circuit board 11.

In the existing circuit breaker, generally, two arc-isolating plates and two magnetic conduction plates are respectively arranged at two sides of an arc-extinguishing chamber 3, and in the carrying, transporting and installing processes of the circuit breaker, the relative positions between the two arc-isolating plates 2 can be changed, so that the arc-extinguishing effect is affected, the structure is complex, the assembly is difficult, gaps can be generated between the two arc-isolating plates 2 and the arc-extinguishing chamber 3, and electric arcs fly out of burn circuit boards. In the circuit breaker in this embodiment, only set up a flash barrier and a magnetic conduction board in one side, reduced the quantity of spare part, reduced flash barrier and magnetic conduction board's assembly degree of difficulty, in the transport, transportation and the installation of circuit breaker, also can not make the flash barrier produce the gap with the explosion chamber between, avoid electric arc departure burn circuit board.

In this embodiment, a first groove 21 is formed at one end of one side of the arc-barrier 2, and the arc extinguishing chamber 3 is disposed in the first groove 21. The explosion chamber 3 includes the explosion bars piece, as shown in fig. 2, and explosion bars piece one end sets up in first recess 21, and the other end stretches out to first recess 21 outside, makes the V type groove of explosion bars piece be in same height with static contact 5 and moving contact 6, increases the area of contact of electric arc and explosion bars piece, and the explosion chamber of being convenient for receives the electric arc, reinforcing extinction effect. The arrangement of the first groove 21 is convenient for the arc extinguishing chamber to receive the arc and is convenient for installing and limiting the arc extinguishing grid plate.

In this embodiment, the device further comprises a fixed contact 5 and a moving contact 6, wherein the fixed contact 5 is connected to the other end of one side of the arc-shaped plate 2, and the moving contact 6 is movably connected to the other end of one side of the arc-shaped plate 2; the magnetic conduction plate 4 is arranged on the other side of the arc-stop plate 2 and is close to the fixed contact 5 and the moving contact 6.

The magnetic conduction plate 4, the fixed contact 5 and the moving contact 6 are positioned at one end of the arc-isolation plate 2, the arc extinguish chamber 3 is positioned at the other end of the arc-isolation plate 2 and positioned at the same side of the arc-isolation plate 2 as the fixed contact 5 and the moving contact 6, and the electric arcs generated at the fixed contact 5 and the moving contact 6 flow to the arc extinguish chamber 3 under the magnetic blowing effect of the magnetic conduction plate 4.

In this embodiment, at least one air outlet 211 is provided on a wall of the first groove 21 facing away from the moving contact 6.

The static contact 5 and the moving contact 6 are in larger break-over current, the ambient temperature rises, larger atmospheric pressure can be generated, the transfer of the electric arc to the arc extinguishing chamber 3 is not facilitated, the arrangement of the air outlet 211 can prevent a closed cavity from being formed between the arc baffle 2 and the arc extinguishing chamber 3, so that the balance of the air pressure inside and outside the first groove 21 is ensured, the electric arc can be quickly transferred to the arc extinguishing chamber 3, the arc extinguishing effect is improved, and the contact burning caused by the backflow of the electric arc is prevented.

In this embodiment, a second groove 22 is formed on the other side of the arc-shaped shield 2, and the magnetic conductive plate 4 is disposed in the second groove 22. The magnetic conduction plate 4 is convenient to assemble and limit.

In this embodiment, the second groove 22 is disposed near one end of the fixed contact 5 and the moving contact 6, and the second groove 22 and the first groove 21 are disposed in a staggered manner and form a step structure. The dislocation of second recess 22 and first recess 21 both can be convenient for assemble and spacing to magnetic conduction board 4, still can promote magnetic conduction board 4 to be in same height with the one end of explosion chamber, is favorable to guiding electric arc to get into in the explosion chamber 3, reinforcing arc extinguishing effect.

In this embodiment, the first groove 21 is a through groove with openings at both ends; the circuit breaker also comprises a first arc striking piece 7 and a second arc striking piece 8; the first striking piece 7 comprises a first striking part 71 positioned at the opening of one end of the first groove 21, and a second striking part 72 extending from one end of the first striking part 71, which is close to the fixed contact 5, to the side part of the fixed contact 5; the second striking member 8 includes a third striking portion 81 located at the opening at the other end of the first groove 21, and a fourth striking portion 82 extending from one end of the third striking portion 81 near the moving contact 6 to the side of the moving contact 6.

One side of the first arc striking piece 7 and the second arc striking piece 8 are propped against the side surface where the first groove 21 of the flash barrier 2 is located, the arc extinguishing chamber 3 is positioned between the first arc striking part 71 and the third arc striking part 81, the second arc striking part 72 and the fourth arc striking part 82 can guide the electric arc to rapidly move from the positions where the fixed contact 5 and the moving contact 6 are located to the direction of the arc extinguishing chamber 3, and the electric arc can be effectively prevented from flying out to two sides of the flash barrier.

In this embodiment, the device further comprises a static support 9, which is fixedly connected in the housing 1 and fixedly connected with the static contact 5. The static support 9 is used for fixedly supporting the static contact 5 at a corresponding position.

In this embodiment, the static stand 9 comprises a first connection section 91 and a second connection section 92; the first connecting section 91 is fixedly connected with the fixed contact 5; the second connecting section 92 is fixedly connected in the shell 1, one end of the first connecting section 91 is connected with one end of the second connecting section 92, and the other end of the second connecting section 92 extends in a direction away from the arc extinguishing chamber 3; an included angle is formed between the first connection section 91 and the second connection section 92; the junction of first linkage segment 91 and second linkage segment 92 is equipped with connecting hole 93, and the one end of second striking portion 72 passes connecting hole 93 and fixes in the one side of first linkage segment 91 back to stationary contact 5.

A first avoiding opening 221 is formed in one end of the bottom of the second groove 22, and one side of the fixed contact 5 of the first connecting section 91 abuts against the first avoiding opening 221 and one side of the magnetic conduction plate 4; the other end of the bottom of the second groove 22 is provided with a second avoiding opening 222, and one side of the fourth arc striking part 82 is propped against the second avoiding opening 222 and the other side of the magnetic conduction plate 4; a limiting plate 223 is arranged on one side of the arc-stop plate 2, which is close to one end of the fixed contact 5 and one side of the moving contact 6 in a protruding way, and one end of the first connecting section 91 and one end of the fourth arc striking part 82 are propped against one side of the limiting plate 223, which is close to the arc extinguishing chamber 3; the end surface of the magnetic conduction plate 4 far away from the arc extinguishing chamber 3 is in the same plane with the end surface of the second arc striking part 72 far away from the first arc striking part 71 and the end surface of the other end of the first connecting section 91; the static contact 5 is located the limiting plate 223 and is close to one side of explosion chamber 3, can prevent effectively that the electric arc from flowing to static contact 5 top, avoids the electric arc to cause the damage to operating device.

In this embodiment, the positioning structure further comprises a positioning structure, wherein the positioning structure comprises a first positioning hole, a second positioning hole 101, a third positioning hole and a positioning column 102; the first positioning hole is arranged on the shell 1; the second positioning hole 101 is arranged on the magnetic conduction plate 4; a third positioning hole is formed in the circuit board 11; the positioning column 102 is convexly arranged on one side of the arc-shaped plate 2 facing the magnetic conduction plate 4, and the positioning column 102 is suitable for penetrating through the second positioning hole 101 and the third positioning hole to be in positioning connection with the first positioning hole.

As shown in fig. 6, the magnetic conductive plate 4 and the circuit board 11 are fixed between the arc-stop plate 2 and the casing 1 by the positioning posts 102, so that the circuit breaker is simple in structure, easy to assemble and reasonable in layout, and the reliability of connection between the arc-stop plate 2 and the magnetic conductive plate 4 and the circuit breaker casing 1 can be improved.

As an alternative embodiment, the first positioning hole may be disposed on the side of the arc-shield 2 facing the magnetic conductive plate 4; the positioning column 102 is arranged on the inner side of the shell 1 in a protruding mode, and the positioning column 102 is suitable for penetrating through the third positioning hole and the second positioning hole 101 to be in positioning connection with the first positioning hole.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims

1. A circuit breaker, comprising:

a housing (1);

the arc-shield plate (2) is arranged in the shell (1);

the arc extinguishing chamber (3) is arranged in the shell (1) and is positioned at one side of the arc barrier (2); the projection area of the arc-isolating plate (2) on the shell (1) is larger than the projection area of the arc-extinguishing chamber (3) on the shell (1);

the magnetic conduction plate (4) is arranged in the shell (1) and is positioned at the other side of the arc barrier (2);

the circuit board (11) is arranged in the shell (1) and is positioned at one side of the magnetic conduction plate (4) away from the arc barrier (2).

2. Circuit breaker according to claim 1, characterized in that one end of one side of the arc barrier (2) is provided with a first recess (21), the arc extinguishing chamber (3) being arranged in the first recess (21).

3. The circuit breaker according to claim 2, further comprising a fixed contact (5) and a moving contact (6), wherein the fixed contact (5) is connected to the other end of one side of the arc barrier (2), and the moving contact (6) is movably connected to the other end of one side of the arc barrier (2); the magnetic conduction plate (4) is arranged on the other side of the arc-stop plate (2) and is close to the positions of the fixed contact (5) and the moving contact (6).

4. A circuit breaker according to claim 3, characterized in that the wall of the first recess (21) facing away from the moving contact (6) is provided with at least one air outlet (211).

5. A circuit breaker according to claim 3, characterized in that the other side of the arc barrier (2) is provided with a second recess (22), the magnetically permeable plate (4) being arranged in the second recess (22).

6. The circuit breaker according to claim 5, characterized in that the second groove (22) is arranged near one end of the stationary contact (5) and the moving contact (6), and the second groove (22) is arranged offset from the first groove (21) and forms a step-like structure.

7. Circuit breaker according to any of claims 3-6, characterized in that the first recess (21) is a through slot provided with openings at both ends; the circuit breaker further comprises:

the first arc striking piece (7) comprises a first arc striking part (71) positioned at the opening of one end of the first groove (21), and a second arc striking part (72) which extends from one end of the first arc striking part (71) close to the fixed contact (5) to the side part of the fixed contact (5);

the second arc striking piece (8) comprises a third arc striking part (81) positioned at the opening of the other end of the first groove (21), and a fourth arc striking part (82) which is formed by extending one end, close to the moving contact (6), of the third arc striking part (81) to the side part of the moving contact (6).

8. The circuit breaker according to claim 7, further comprising a stationary support (9) fixedly connected within the housing (1) and fixedly connected with the stationary contact (5).

9. Circuit breaker according to claim 8, characterized in that the static cradle (9) comprises:

the first connecting section (91) is fixedly connected with the fixed contact (5);

the second connecting section (92) is fixedly connected in the shell (1), one end of the first connecting section (91) is connected with one end of the second connecting section (92), and the other end of the second connecting section (92) extends in a direction deviating from the arc extinguishing chamber (3); an included angle is formed between the first connecting section (91) and the second connecting section (92); the connecting part of the first connecting section (91) and the second connecting section (92) is provided with a connecting hole (93), and one end of the second striking part (72) passes through the connecting hole (93) to be fixed on one side of the first connecting section (91) opposite to the fixed contact (5).

10. The circuit breaker according to any one of claims 1-6, 8-9, further comprising a positioning structure comprising:

a first positioning hole arranged on the shell (1);

a second positioning hole (101) arranged on the magnetic conduction plate (4);

a third positioning hole arranged on the circuit board (11);

the positioning column (102) is arranged on one side of the arc-shaped isolation plate (2) facing the magnetic conduction plate (4) in a protruding mode, and the positioning column (102) is suitable for penetrating through the second positioning hole (101) and the third positioning hole to be in positioning connection with the first positioning hole.