CN217933667U

CN217933667U - Circuit breaker

Info

Publication number: CN217933667U
Application number: CN202221917063.XU
Authority: CN
Inventors: 薛志炜; 彭琼; 龚祚勇; 蒋武山; 金建磊
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2022-07-22
Filing date: 2022-07-22
Publication date: 2022-11-29
Anticipated expiration: 2032-07-22

Abstract

The utility model relates to the technical field of electrical equipment, concretely relates to circuit breaker. The utility model provides a pair of circuit breaker, include: the device comprises a shell, a moving contact, a static contact, a release and an operating mechanism. A first area, a second area and a third area which are sequentially arranged are formed in the shell, an arc extinguish chamber is arranged in the first area, the release is located in the second area, the operating mechanism is located in the third area, and the operating mechanism is connected with the release through a traction rod. The static contact is provided with a first contact which is arranged in a first area, the moving contact comprises a first end and a second end which are opposite, the first end is provided with a second contact, the second end is connected with the operating mechanism, and the first end sequentially penetrates through the second area and the static contact. Through the structure of adjustment circuit breaker, set up first contact in first region, the moving contact passes second region and static contact in proper order for the magnetic blow-off direction to electric arc that the return circuit that static contact and moving contact formed produced points to the direction of explosion chamber, improves the striking effect.

Description

Circuit breaker

Technical Field

The utility model relates to an electrical equipment's technical field, concretely relates to circuit breaker.

Background

A molded case circuit breaker, also called a device type circuit breaker, is used to automatically cut off a current after the current exceeds a trip setting.

Generally, a molded case circuit breaker includes a moving contact, a fixed contact, an arc extinguish chamber, and the like, wherein the moving contact and the fixed contact are connected to a circuit, and when the moving contact and the fixed contact are closed, a closed loop through which a current can flow is formed. When the moving contact and the static contact are disconnected, electric arcs can be generated, the magnetic blowing force generated by the loop is needed to blow the electric arcs into the arc extinguish chamber, and the generated electric arcs are cut by the arc extinguish grid pieces arranged in the arc extinguish chamber so as to extinguish the electric arcs.

However, in the prior art, as shown in fig. 7, a contact point between the moving contact 2 'and the fixed contact 1' is located below the arc extinguish chamber, and an electric arc between the moving contact 2 'and the fixed contact 1' needs to enter the arc extinguish chamber under the action of magnetic blow generated by the fixed contact 1 'and the moving contact 2'. However, since the current flows from the fixed contact 1 'to the moving contact 2', the magnetic blow-out force generated by the portion of the lower end of the fixed contact 1 'extending rightward is directed to the moving contact 2' and not to the arc extinguishing chamber, resulting in a poor arc striking effect.

SUMMERY OF THE UTILITY MODEL

The utility model discloses (one) the problem that will solve is: the magnetic blow-out force generated by the static contact of the existing circuit breaker can not blow electric arcs into the arc extinguishing grid, so that the arc extinguishing effect is poor.

(II) technical scheme

In order to solve the technical problem, an embodiment of the utility model provides a circuit breaker, include: the device comprises a shell, a moving contact, a fixed contact, a release and an operating mechanism;

a first area, a second area and a third area which are sequentially arranged are formed in the shell, an arc extinguish chamber is arranged in the first area, the tripper is positioned in the second area, the operating mechanism is positioned in the third area, the operating mechanism comprises a draw bar, the draw bar is arranged on one side close to the second area, and the draw bar is connected with the tripper;

the fixed contact is provided with a first contact, the first contact is arranged in the first area, the moving contact comprises a first end and a second end which are arranged oppositely, the first end is provided with a second contact, the second end is connected with the operating mechanism, the first end sequentially penetrates through the second area and the fixed contact, and the operating mechanism drives the moving contact to rotate so that the first contact is contacted with the second contact.

Further, the housing comprises a third end and a fourth end which are oppositely arranged; the operating mechanism comprises a handle, the handle extends out of the third end, and the fourth end is used for being connected with a power supply and a load;

the static contact comprises a fifth end and a sixth end which are arranged oppositely, the fifth end is close to the third end, the sixth end is close to the fourth end, the first contact is arranged at the fifth end, the second end penetrates through the static contact, and the handle drives the moving contact to move towards the direction of the fifth end so as to enable the first contact to be contacted with the second contact.

Furthermore, a through hole is formed in the static contact, and the through hole is located between the fifth end and the sixth end.

Furthermore, the sixth end extends out of the fourth end to be connected with the power supply or the load.

Furthermore, a plurality of arc-extinguishing grid pieces are arranged in the arc-extinguishing chamber at intervals, and all the arc-extinguishing grid pieces point to the direction of the fourth end from the third end.

Furthermore, a side plate is arranged in the arc extinguishing chamber, and all the arc extinguishing grid pieces are arranged on the side plate.

Furthermore, the fifth end is provided with a connecting part which extends towards the direction of the arc extinguishing grid piece;

the first contact is disposed on the connection portion.

Furthermore, the connecting part is a bending structure which is arranged at the fifth end and is bent towards the direction of the arc extinguishing grid piece.

Furthermore, an avoiding structure is arranged on at least part of the arc extinguishing grid pieces, and the first end can swing in the avoiding structure.

Furthermore, one side of the arc-extinguishing grid piece, which is close to the static contact, is provided with a gap, and all the gaps are correspondingly arranged;

all the openings form an avoiding groove which can enable the first end to pass through, and the avoiding groove is an avoiding structure.

The utility model has the advantages that:

the utility model provides a pair of circuit breaker, include: the device comprises a shell, a moving contact, a static contact, a release and an operating mechanism. A first area, a second area and a third area are formed in the shell and sequentially arranged, an arc extinguish chamber is arranged in the first area, the tripper is located in the second area, the operating mechanism is located in the third area and comprises a draw bar, the draw bar is arranged on one side close to the second area, and the draw bar is connected with the tripper. The static contact is provided with a first contact which is arranged in the first area, the moving contact comprises a first end and a second end which are oppositely arranged, the first end is provided with a second contact, the second end is connected with the operating mechanism, the first end sequentially penetrates through the second area and the static contact, and the operating mechanism drives the moving contact to rotate so as to enable the first contact and the second contact to be connected.

Through the structural layout of adjustment circuit breaker, form the structure that first region, second region and third region set gradually to set up first contact in first region, the moving contact passes second region and static contact in proper order, so, make the magnetic blow-out direction to electric arc that the return circuit that static contact and moving contact formed produced point to the direction of explosion chamber, improve the striking effect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of an internal structure of a circuit breaker according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of the matching between the moving contact and the fixed contact of the circuit breaker provided by the embodiment of the present invention;

fig. 3 is a schematic structural view of a static contact according to an embodiment of the present invention;

fig. 4 is a schematic view of an internal structure of an arc extinguish chamber according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an arc chute provided in an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a housing according to an embodiment of the present invention;

fig. 7 is a schematic view of the internal structure of a prior art circuit breaker.

An icon: 1-a static contact; 11-a first contact; 12-a through hole; 13-fifth end; 14-sixth end; 15-a connecting part; 151-bent structure;

2-moving contact; 21-a second contact; 22-a first end; 23-a second end;

3-an arc extinguishing chamber; 31-arc chute pieces; 311-opening; 33-side plates; 34-an avoidance structure; 341-avoidance groove;

4-an operating mechanism; 41-a rotating shaft; 42-a handle; 43-a drawbar;

51-a third terminal; 52-fourth end; 53-a housing; 531-a first area; 532-a second region; 533-third region;

6-electric arc;

1' -static contact; 2' -moving contact; 31' -arc chute sheet.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 to 6, an embodiment of the present invention provides a circuit breaker, including: the device comprises a shell 53, a movable contact 2, a fixed contact 1, a release (not shown in the figure) and an operating mechanism 4. A first region 531, a second region 532 and a third region 533 which are sequentially arranged are formed in the shell 53, the arc extinguish chamber 3 is arranged in the first region 531, the tripper is located in the second region 532, the operating mechanism 4 is located in the third region 533, the operating mechanism 4 comprises a traction rod 43, the traction rod 43 is arranged on one side close to the second region 532, the traction rod 43 is connected with the tripper, and the tripper is located between the traction rod 43 and the arc extinguish chamber 3. The static contact 1 is provided with a first contact 11, the first contact 11 is disposed in the first region 531, the movable contact 2 includes a first end 22 and a second end 23 which are disposed oppositely, the first end 22 is provided with a second contact 21, the second end 23 is connected with the operating mechanism 4, the first end 22 sequentially passes through the second region 532 and the static contact 1, and the operating mechanism 4 drives the movable contact 2 to rotate so as to make the first contact 11 contact with the second contact 21.

In this embodiment, the operating mechanism 4 is connected to the movable contact 2, and can control the movable contact 2 to rotate in the housing 53. Specifically, taking the initial state of the circuit breaker in the open circuit state as an example, the operating mechanism 4 drives the moving contact 2 to rotate along a first direction, and the first contact 11 is in contact with the second contact 21; the operating mechanism 4 drives the contact 2 to rotate in the second direction, and the first contact 11 is disconnected from the second contact 21. Wherein the first direction and the second direction are opposite.

The operating mechanism 4 comprises a draw bar 43, and the draw bar 43 is connected with the tripper. When a short circuit occurs in the power supply, the tripper trips the operating mechanism 4 through the traction rod 43, so that the movable contact 2 is separated from the fixed contact 1.

One end of the static contact 1 is used for connecting with a power supply, the other end is provided with a first contact 11 which is used for contacting with the moving contact 2, the moving contact 2 is used for connecting with a load, and when the moving contact 2 is connected with the static contact 1, namely a circuit breaker is closed, current flows along the direction of the power supply-the static contact 1-the moving contact 2-the load; when the moving contact 2 is disconnected with the static contact 1, the load is disconnected with the power supply.

The arc extinguishing chamber 3 is used for eliminating an electric arc 6 generated when the moving contact 2 and the static contact 1 are disconnected.

In the circuit breaker provided in the present embodiment, as shown in fig. 1, three regions, namely, a first region 531, a second region 532, and a third region 533, are respectively disposed in the housing 53. The first region 531 is an arc extinguish chamber 3, an arc 6 generated between the moving contact 2 and the fixed contact 1 enters the arc extinguish chamber 3 under the action of magnetic blowing, and the arc extinguish chamber 3 eliminates the arc 6. The second area 532 is used for setting a release; the third area 533 is used for arranging the operating mechanism 4, and the traction rod 43 of the operating mechanism 4 is connected to the trip device in the second area 532, and the trip device controls the operating mechanism 4 through the traction rod 43 to realize circuit breaking. The movable contact 2 includes a first end 22 and a second end 23 which are oppositely arranged, wherein the second end 23 is used for being connected with the operating mechanism 4, the first end 22 is provided with a second contact 21, one end of the fixed contact 1, which is provided with the first contact 11, extends into the arc extinguish chamber 3, and the first end 22 of the movable contact 2 sequentially passes through the second region 532 and the fixed contact 1, that is, in this embodiment, the movable contact 2 spans across three regions. The movable contact 2 is rotated by the operating mechanism 4 so that the first contact 11 and the second contact 21 are contacted or disconnected.

Optionally, the circuit breaker provided in this embodiment may include a plurality of first contacts 11 and second contacts 21, and of course, the first contacts 11 and the second contacts 21 are arranged in a one-to-one correspondence. I.e. one second contact 21 for each first contact 11. As mentioned above, the movable contact 2 comprises a first end 22 and a second end 23 which are oppositely arranged, and the second end 23 is connected to the operating mechanism 4, i.e. all the second contacts 21 are located on the same side of the second area 532, i.e. in the first area 531.

The circuit breaker provided by this embodiment forms the structure that first region 531, second region 532 and third region 533 set gradually through the structural layout of adjustment circuit breaker to set up first contact 11 in first region 531, moving contact 2 passes second region 532 and static contact 1 in proper order, so, make the direction of the magnetic blowing force to the electric arc that the return circuit that static contact 1 and moving contact 2 formed point to the direction of explosion chamber 3, improve the striking effect.

As shown in fig. 1, a current flows from the fixed contact 1 to the movable contact 2, and the direction of a magnetic blowing force generated by a loop formed by the fixed contact 1 and the movable contact 2 to the arc 6 is directed to the arc extinguish chamber 3.

As shown in fig. 1, the housing 53 includes a third end 51 and a fourth end 52 disposed opposite to each other. The third end 51 is an operation end of the circuit breaker, the operation mechanism 4 comprises a handle 42, the handle 42 extends out of the third end 51, and an operator controls the on-off of the circuit breaker by shifting the handle 42. The fourth terminal 52 is the terminal connected to a power supply and a load, and in use, the fourth terminal 52 is plugged into the power supply and the load.

The static contact 1 includes a fifth end 13 and a sixth end 14 that are oppositely disposed, the fifth end 13 is close to the third end 51, the sixth end 14 is close to the fourth end 52, the first contact 11 is disposed at the fifth end 13, the second end 23 passes through the static contact 1, and the handle 42 drives the movable contact 2 to move toward the fifth end 13, so that the first contact 11 is in contact with the second contact 21.

In this embodiment, preferably, under the condition that other conditions are not changed, the direction of the magnetic blowing force generated by the loop formed by the moving contact 2 and the static contact 1 to the arc 6 is directed to the arc extinguishing chamber 3 by only adjusting the positions of the moving contact 2 and the static contact 1, so as to improve the arc striking effect.

Specifically, in the prior art, as shown in fig. 7, when the moving contact 2 'and the static contact 1' are closed, the moving contact 2 'moves toward the fourth end 52, and when the moving contact 2' and the static contact 1 'are separated, the moving contact 2' moves toward the third end 51.

In the present embodiment, as shown in fig. 1, since the first contact 11 is located at the fifth end 13, and the through hole 12 is located between the fifth end 13 and the sixth end 14, when the moving contact 2 and the static contact 1 are closed, the moving contact 2 moves toward the third end 51, and when the moving contact 2 and the static contact 1 are disconnected, the moving contact 2 moves toward the fourth end 52.

The utility model provides a circuit breaker, through the setting position of adjustment static contact 1 and moving contact 2 (invert static contact 1 and moving contact 2), realize the directional explosion chamber 3's of magnetic blow-out force that the return circuit that moving contact 2 and static contact 1 formed produced direction, promote the striking effect.

Optionally, as shown in fig. 2 and 3, a through hole 12 is provided on the static contact 1, the first end 22 passes through the through hole 12, and the through hole 12 is located between the fifth end 13 and the sixth end 14.

In this embodiment, the through hole 12 for passing the second end 23 of the moving contact 2 is provided on the stationary contact 1, which is simple in structure and convenient to install.

As shown in fig. 1, 2 and 4, a plurality of arc-extinguishing bars 31 are spaced inside the arc-extinguishing chamber 3, and all the arc-extinguishing bars 31 are distributed inside the arc-extinguishing chamber 3 along a direction from the third end 51 to the fourth end 52.

In this embodiment, a gap is formed between two adjacent arc-extinguishing grid pieces 31, and by distributing all the arc-extinguishing grid pieces 31 in the direction from the third end 51 to the fourth end 52, the magnetic blowing force generated by the loop formed by the static contact 1 and the movable contact 2 can be directed to the inlet end of the arc-extinguishing grid piece 31, so that the arc 6 can be cut into short arcs by the arc-extinguishing grid pieces 31, and the arc-extinguishing effect is improved.

As shown in fig. 1, a side plate 33 is provided in the arc chute 3, and all the arc chute pieces 31 are provided on the side plate 33.

As shown in fig. 1, the fifth end 13 is provided with a connecting portion 15, and the connecting portion 15 extends in the direction of the arc chute 31. The first contact 11 is disposed on the connection portion 15.

In use, when the first end 22 is rotated to the position of the connecting portion 15, the second contact 21 can be brought into contact with the first contact 11.

Alternatively, as shown in fig. 1 to 3, the connecting portion 15 is a bent structure 151 disposed at the fifth end 13 and bent toward the arc chute 31.

In this embodiment, the fifth end 13 of the static contact 1 is bent to form the connecting portion 15 for disposing the first contact 11, which is simple in structure and low in cost.

As shown in fig. 1, the stationary contact 1 is located in the arc extinguishing chamber 3 in order to shorten the distance between the arc 6 and the arc chute 31. An avoiding structure 34 is arranged on at least part of the arc chute 31, and the first end 22 can swing in the avoiding structure 34.

In this embodiment, the first end 22 of the movable contact 2 passes through the stationary contact 1 via the through hole 12, and therefore, the first end 22 is also necessarily located inside the arc-extinguishing chamber 3. In order to improve the arc extinguishing effect, the arc extinguishing grid pieces 31 are arranged at positions as close to the static contact 1 as possible.

Specifically, as shown in fig. 2, 4 and 5, a notch 311 is disposed on one side of the arc-extinguishing grid 31 on the motion track of the first end 22, which is close to the static contact 1, and all the notches 311 are disposed correspondingly. All the notches 311 form an avoidance groove 341 through which the first end 22 can pass, and the avoidance groove 341 is the avoidance structure 34.

In this embodiment, the notch 311 is a notch, and is disposed on the arc-extinguishing grid plate 31 near the end of the static contact 1.

All the notches 311 are correspondingly arranged, that is, the centers of all the notches 311 are sequentially connected to form a connecting line, and the connecting line is the swing track of the first end 22.

In this embodiment, the avoiding structure 34 is an avoiding groove 341 formed by all the notches 311, the first end 22 can swing in the avoiding groove 341, and the distance between the movable contact 2 and the arc chute 31 is made closer by providing the avoiding groove 341, so that the breaker has a compact structure.

The embodiment of the utility model provides a circuit breaker is formed with the three region of first region 531, the regional 532 of second and third region 533 in the casing. All arc extinguishing grid pieces 31 are connected to the side plates 33 positioned in the first area 531, through holes are formed in the bottom of the first area 531, and the sixth end 14 of the strip-shaped static contact 1 penetrates through the through holes to be connected with a power supply; the fifth end 13 is provided with the bending structure 151, and the first contact 11 is disposed on the bending structure 151. A trip unit is disposed in the second region 532, an operating mechanism 4 is disposed in the third region 533, and the drawbar 43 of the operating mechanism 4 is located on a side close to the second region 532 and is connected to the trip unit in the second region 532. The first end 22 of the movable contact 2 is provided with a second contact 21 for contacting the first contact 11, and the second end 23 is used for connecting with the rotating shaft 41. The first end 22 sequentially passes through the second region 532 and the through hole 12 of the static contact 1, and is located at one side of the static contact 1 close to the arc-extinguishing grid piece 31. The rotating shaft 41 is driven to rotate by the handle 42, so as to drive the movable contact 2 to rotate, and at the same time, the first end 22 is also bent towards the first contact 11, so as to facilitate the connection between the first contact 11 and the second contact 21.

All the arc extinguishing grids 31 arranged on the side plates 33 are arranged at intervals. When the static contact 1 is separated from the movable contact 2, an arc 6 as shown in fig. 1 is generated, and the arc 6 is blown into the gap under the action of magnetic force to extinguish the arc.

In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the communication may be direct or indirect through an intermediate medium, or may be internal to both elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A circuit breaker, comprising: the device comprises a shell (53), a moving contact (2), a static contact (1), a release and an operating mechanism (4);

a first area (531), a second area (532) and a third area (533) are sequentially formed in the shell (53), an arc extinguish chamber (3) is arranged in the first area (531), the tripper is located in the second area (532), the operating mechanism (4) is located in the third area (533), the operating mechanism (4) comprises a draw bar (43), the draw bar (43) is arranged on one side close to the second area (532), and the draw bar (43) is connected with the tripper;

the fixed contact (1) is provided with a first contact (11), the first contact (11) is arranged in the first area (531), the movable contact (2) comprises a first end (22) and a second end (23) which are oppositely arranged, the first end (22) is provided with a second contact (21), the second end (23) is connected with the operating mechanism (4), the first end (22) sequentially penetrates through the second area (532) and the fixed contact (1), and the operating mechanism (4) drives the movable contact (2) to rotate so that the first contact (11) is in contact with the second contact (21).

2. The circuit breaker according to claim 1, wherein said housing (53) comprises a third end (51) and a fourth end (52) arranged opposite; the operating mechanism (4) comprises a handle (42), the handle (42) extends out of the third end (51), and the fourth end (52) is used for being connected with a power supply and a load;

the static contact (1) comprises a fifth end (13) and a sixth end (14) which are oppositely arranged, the fifth end (13) is close to the third end (51), the sixth end (14) is close to the fourth end (52), the first contact (11) is arranged at the fifth end (13), the second end (23) penetrates through the static contact (1), and the handle (42) drives the movable contact (2) to move towards the direction of the fifth end (13) so as to enable the first contact (11) to be in contact with the second contact (21).

3. The circuit breaker according to claim 2, wherein the stationary contact (1) is provided with a through hole (12), and the through hole (12) is located between the fifth end (13) and the sixth end (14).

4. The circuit breaker of claim 2 wherein said sixth end (14) extends beyond said fourth end (52) for connection to said power source or load.

5. The circuit breaker according to claim 2, wherein a plurality of arc chute plates (31) are arranged at intervals in the arc chute (3), and all the arc chute plates (31) are along the direction from the third end (51) to the fourth end (52).

6. The circuit breaker according to claim 5, characterized in that a side plate (33) is further arranged inside the arc extinguishing chamber (3), and all arc chute pieces (31) are arranged on the side plate (33).

7. The circuit breaker according to claim 5, characterized in that the fifth end (13) is provided with a connecting portion (15), the connecting portion (15) extending in the direction of the arc chute (31);

the first contact (11) is disposed on the connecting portion (15).

8. The circuit breaker according to claim 7, wherein the connecting portion (15) is a bent structure (151) disposed at the fifth end (13) and bent toward the arc chute (31).

9. The circuit breaker according to claim 5, wherein at least a portion of the arc chute plates (31) are provided with an avoiding structure (34), and the first end (22) is capable of swinging within the avoiding structure (34).

10. The circuit breaker according to claim 9, wherein a notch (311) is formed in one side of the arc chute (31) close to the fixed contact (1), and all the notches (311) are correspondingly formed;

all the gaps (311) form an avoiding groove (341) through which the first end (22) can pass, and the avoiding groove (341) is the avoiding structure (34).