CN217387058U

CN217387058U - Contact return circuit and circuit breaker

Info

Publication number: CN217387058U
Application number: CN202220973883.4U
Authority: CN
Inventors: 周鑫; 彭琼; 李强
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2022-09-06
Anticipated expiration: 2032-04-24

Abstract

The utility model discloses a contact return circuit and circuit breaker relates to low-voltage apparatus technical field. The utility model discloses a contact return circuit, including moving contact, static contact and static contact support, the one end and the static contact electricity of static contact support are connected, the other end is used for leading-in electric current, and the one end of moving contact cooperatees with the static contact, the other end is used for deriving the electric current, and moving contact and static contact divide absolutely to produce electric arc and shift to the explosion chamber, and static contact support includes the conductive part, and the conductive part is located one side that electric arc kept away from the explosion chamber. The utility model provides a contact return circuit, through increasing the static contact support and adjusting the overall arrangement of each part in the contact return circuit, make contact support's conductive part be located one side that arc kept away from the explosion chamber, the current direction in the conductive part is opposite with the current direction of arc, so that the conductive part can provide the electronic repulsion towards the explosion chamber direction for arc, and then improve the initial transfer rate of arc, effective protection moves, the static contact, and make the circuit breaker have better breaking capacity.

Description

Contact return circuit and circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus technical field particularly, relates to a contact return circuit and circuit breaker.

Background

The circuit breaker is a switching device capable of closing, carrying and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a prescribed time, and has a short circuit, overload or leakage protection function.

The contact loop of the existing circuit breaker can not provide electric repulsion force for electric arcs, the initial transfer speed of the electric arcs is not fast enough, and contacts are easily burnt, so that the breaking capacity of the circuit breaker is weak.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a contact return circuit and circuit breaker, it can provide great electronic repulsion, shifts electric arc fast, has stronger breaking capacity.

The embodiment of the utility model is realized like this:

a contact loop comprises a moving contact, a fixed contact and a fixed contact support, wherein one end of the fixed contact support is electrically connected with the fixed contact, the other end of the fixed contact support is used for leading in current, one end of the moving contact is matched with the fixed contact, the other end of the moving contact is used for leading out current, the moving contact and the fixed contact are disconnected to generate electric arc and transfer the electric arc to an arc extinguish chamber, the fixed contact support comprises a conductive part, and the conductive part is positioned on one side, away from the arc extinguish chamber, of the electric arc.

Optionally, as an implementable manner, the static contact bracket further includes a first connection portion for connecting with the static contact, the conductive portion is plate-shaped, a plate surface of the conductive portion is parallel to a side surface of the moving contact, and the first connection portion is perpendicular to the plate surface of the conductive portion.

Optionally, as an implementable manner, the two conductive portions include two conductive portions arranged in parallel, the two conductive portions are respectively located at two sides of the moving contact, and two ends of the first connection portion are respectively connected with the two conductive portions.

Optionally, as an implementable manner, the first connecting portion and the static contact are both plate-shaped, a plate surface on one side of the static contact is matched with the movable contact, and a plate surface on the other side of the static contact is attached to the plate surface of the first connecting portion.

Optionally, as an implementable mode, the static contact device further includes a copper bar and a wiring terminal, one end of the copper bar is electrically connected with the static contact support, and the other end of the copper bar is electrically connected with the wiring terminal.

Optionally, as an implementable manner, the static contact bracket further includes a second connection portion connected to the other end of the conductive portion, the second connection portion is plate-shaped, and a plate surface of the second connection portion is attached to the surface of the copper bar.

Optionally, as an implementable manner, the two conductive portions are arranged in parallel, the two conductive portions are respectively located at two sides of the moving contact, and two ends of the second connection portion are respectively connected with the two conductive portions.

Optionally, as an implementable manner, the static contact bracket and the copper bar are integrally formed.

Alternatively, as an implementable manner, the first connecting portion and the conductive portion are integrally formed.

A circuit breaker comprising a contact circuit as claimed in any preceding claim.

The utility model discloses beneficial effect includes:

the utility model provides a contact return circuit, including moving contact, static contact and static contact support, the one end and the static contact electricity of static contact support are connected, the other end is used for leading-in electric current, and the one end of moving contact cooperatees with the static contact, the other end is used for deriving the electric current, and moving contact and static contact divide the branch to produce electric arc and shift to the explosion chamber, and static contact support includes the conductive part, and the conductive part is located one side that electric arc kept away from the explosion chamber. According to the contact circuit, the static contact support is added, the layout of each part in the contact circuit is adjusted, the conductive part of the contact support is located on one side, away from the arc extinguish chamber, of the arc, the current direction in the conductive part is opposite to the current direction of the arc, so that the conductive part can provide electric repulsion towards the arc extinguish chamber for the arc, the initial transfer speed of the arc is further improved, the static and dynamic contacts are effectively protected, and the circuit breaker has good breaking capacity.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

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

fig. 2 is a schematic structural diagram of a contact loop according to an embodiment of the present invention;

fig. 3 is one of schematic structural diagrams of a stationary contact bracket in a contact loop according to an embodiment of the present invention;

fig. 4 is a second schematic structural diagram of a contact loop according to an embodiment of the present invention;

fig. 5 is a second schematic structural diagram of a stationary contact support in a contact loop according to an embodiment of the present invention.

Icon: 010-a circuit breaker; 020-arc extinguishing chamber; 030-arc runner; 040-handle; 050-electric arc; 100-contact loop; 110-moving contact; 120-static contact; 130-a stationary contact holder; 131-a conductive portion; 132-a first connection; 133-a second connecting portion; 140-copper bar; 150-terminal.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "vertical", "horizontal", "inside", "outside", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which the products of the present invention are conventionally placed when in use, and are only for convenience of description and simplification of the 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.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, the circuit breaker 010 includes an operating mechanism (not shown) and a contact loop 100, and the circuit breaker 010 accesses a circuit through two ends of the contact loop 100, and controls on/off of the contact loop 100 through the operating mechanism to perform on/off control on the accessed circuit. Specifically, the operating mechanism is in driving connection with the moving contact 110 in the contact loop 100, and the operating mechanism drives the moving contact 110 to rotate so as to contact or separate from the fixed contact 120 in the contact loop 100, thereby implementing on/off of the contact loop 100. Illustratively, the operating mechanism may be coupled to the handle 040 for facilitating operation by the user.

When the circuit is broken, an electric arc 050 can be formed between the movable contact 110 and the fixed contact 120, and the electric arc 050 moves towards the arc extinguish chamber 020 and extinguishes under the action of the arc striking plate 030. However, in the conventional layout of the contact circuit 100, the initial speed of the arc 050 moving to the arc extinguish chamber 020 is slow, and the arc 050 burning between the movable contact 110 and the fixed contact 120 for a long time is easy to cause damage to the contacts, which also reduces the breaking capacity of the circuit breaker 010. In view of this, the present application is specifically made.

Referring to fig. 2, the present embodiment provides a contact circuit 100, which includes a moving contact 110, a static contact 120, and a static contact support 130, wherein one end of the static contact support 130 is electrically connected to the static contact 120, and the other end is used for introducing a current, one end of the moving contact 110 is matched with the static contact 120, and the other end is used for leading out the current, the moving contact 110 and the static contact 120 break to generate an electric arc 050 and transfer the electric arc 050 to an arc extinguish chamber 020, the static contact support 130 includes a conductive part 131, and the conductive part 131 is located on a side of the electric arc 050 away from the arc extinguish chamber 020.

The static contact 120 is fixed on the static contact support 130, the moving contact 110 is rotatably disposed beside the static contact 120 and is matched with the static contact 120, and the static contact support 130 and the moving contact 110 can be respectively connected to an external circuit through a conductive structure. When the moving contact 110 contacts with the fixed contact 120 and the contact loop 100 is connected, the current flows from the fixed contact bracket 130 to the fixed contact 120 and the moving contact 110 in sequence; at the initial stage of the disconnection between the movable contact 110 and the fixed contact 120, an electric arc 050 exists between the movable contact 110 and the fixed contact 120, the contact circuit 100 is still in a conducting state, the current flows from the fixed contact bracket 130 to the fixed contact 120 and flows to the movable contact 110 via the electric arc 050, and arrows in fig. 2 show the flowing direction of the current in the contact circuit 100 at the initial stage of the disconnection and the positions where the current flows in sequence.

The static contact support 130 is divided into a conductive part 131, the conductive part 131 is located on one side of the electric arc 050 far away from the arc extinguish chamber 020, the current direction in the conductive part 131 is opposite to the current direction in the electric arc 050, the conductive part 131 can provide electric repulsive force towards the arc extinguish chamber 020 direction for the electric arc 050, so that the initial movement speed of the electric arc 050 is improved, the electric arc 050 is accelerated to transfer to the arc extinguish chamber 020, further burning loss of the movable contact 110 and the static contact 120 is reduced, and breaking capacity of the circuit breaker 010 is improved.

It should be noted that the fixed contact support 130, the fixed contact 120, and the movable contact 110 can conduct electricity, so as to ensure that current can flow in the contact loop 100. The fixed contact 120 and the fixed contact 120 may be connected by welding. The conductive part 131 of the static contact holder 130 may be located entirely on the side of the electric arc 050 away from the arc chute 020, or may be located only partially on the side of the electric arc 050 away from the arc chute 020. The conductive part 131 may be parallel to the arc 050 or may be disposed at an acute angle, it being understood that the smaller the angle between the conductive part 131 and the arc 050, the better the acceleration effect on the arc 050. Preferably, the conductive portion 131 is parallel to the arc 050 direction.

In the contact circuit 100, the static contact support 130 is added and the layout of each part in the contact circuit 100 is adjusted, so that the conductive part 131 of the contact support is positioned on one side of the electric arc 050 far away from the arc extinguish chamber 020, and the current direction in the conductive part 131 is opposite to the current direction of the electric arc 050, so that the conductive part 131 can provide electric repulsion towards the arc extinguish chamber 020 direction for the electric arc 050, further the initial transfer speed of the electric arc 050 is improved, the static and dynamic contacts 120 are effectively protected, and the circuit breaker 010 has better breaking capacity.

Referring to fig. 2 and fig. 3, optionally, in an implementation manner of the embodiment of the present invention, the static contact bracket 130 further includes a first connection portion 132 for connecting with the static contact 120, the conductive portion 131 is plate-shaped, a plate surface of the conductive portion 131 is parallel to a side surface of the movable contact 110, and the first connection portion 132 is perpendicular to the plate surface of the conductive portion 131.

The static contact holder 130 further includes a first connecting portion 132 capable of conducting electricity, and the current on the conducting portion 131 flows into the static contact 120 through the first connecting portion 132. The conductive part 131 is disposed side by side with the movable contact 110, and a plate surface of the conductive part 131 is parallel to a side surface of the movable contact 110 to avoid interference between the two. The first connecting portion 132 and the movable contact 110 are located on the same side of the conductive portion 131, and the first connecting portion 132 is perpendicular to the plate surface of the conductive portion 131 and extends to the lower side of the movable contact 110. The fixed contact 120 is fixed to the first connecting portion 132 and is in fit communication with the movable contact 110.

Referring to fig. 4 and fig. 5, optionally, in an implementation manner of the embodiment of the present invention, the two conductive portions 131 include two conductive portions arranged in parallel, the two conductive portions 131 are respectively located at two sides of the movable contact 110, and two ends of the first connecting portion 132 are respectively connected to the two conductive portions 131.

The two conductive portions 131 are respectively disposed on two sides of the movable contact 110 to avoid interference with the movable contact 110, and leave a space for connecting the movable contact 110 with an operating mechanism. The first connecting portion 132 is connected between the two conductive portions 131 to ensure that the fixed contact 120 can be matched with the movable contact 110 after being fixed to the first connecting portion 132. The currents in the two conductive portions 131 flow to the first connecting portion 132 and then converge, and then flow to the static contact 120. The two conductive parts 131 are arranged, so that the magnetic force of the static contact support 130 towards the arc extinguish chamber 020 direction can be further improved, the electric repulsion force borne by the electric arc 050 is stronger, and the transfer speed is higher.

Referring to fig. 2 and fig. 4, optionally, in an implementation manner of the present invention, the first connection portion 132 and the static contact 120 are both plate-shaped, one side plate surface of the static contact 120 is matched with the movable contact 110, and the other side plate surface is attached to the plate surface of the first connection portion 132. Due to the arrangement, the connection between the static contact 120 and the static contact support 130 is simpler and more stable, the structure of the static contact support 130 is simplified, and the static contact support 130 is easier to process.

Optionally, in an achievable mode of the embodiment of the present invention, the first connecting portion 132 and the conductive portion 131 are integrally formed to be disposed so as to improve stability and processing efficiency of the static contact support 130 structure. For example, as shown in fig. 3, if the conductive portion 131 includes one, the conductive portion 131 and the first connection portion 132 may be formed by bending a single plate-shaped material; as shown in fig. 5, if the conductive portions 131 include two, the two conductive portions 131 and the first connection portion 132 may be formed by double-side bending a single plate-shaped material.

Referring to fig. 1 and fig. 2, optionally, in an implementation manner of the embodiment of the present invention, the apparatus further includes a copper bar 140 and a connection terminal 150, one end of the copper bar 140 is electrically connected to the static contact bracket 130, and the other end is electrically connected to the connection terminal 150. The static contact holder 130 is connected to an external circuit through the copper bar 140 and the connection terminal 150. For example, the copper bar 140 extends from the fixed contact holder 130 to the arc extinguish chamber 020, passes through the arc extinguish chamber 020 and then is connected to the connection terminal 150, so as to save the space of the breaker 010 in the height direction.

In order to facilitate the processing and save the cost, it is optional, in an achievable mode of the embodiment of the present invention, the static contact support 130 and the copper bar 140 are integrally formed and combined into one part.

Referring to fig. 2 and 4, optionally, in an implementation manner of the embodiment of the present invention, the static contact bracket 130 further includes a second connecting portion 133 connected to the other end of the conductive portion 131, the second connecting portion 133 is plate-shaped, and a surface of the second connecting portion 133 is attached to the surface of the copper bar 140.

The static contact holder 130 further includes a second conductive connecting portion 133, the conductive portion 131 is connected to the copper bar 140 through the second conductive connecting portion 133, and the second conductive connecting portion 133 may be welded to the conductive portion 131. The second connecting portion 133 can improve flexibility of the connecting direction and position between the conductive portion 131 and the copper bar 140, and more fully and reasonably utilize the space inside the circuit breaker 010. Illustratively, the plate surface of the second connecting portion 133 is perpendicular to the conductive portion 131, and the second connecting portion 133 and the movable contact 110 are located on the same side of the conductive portion 131, so as to save space of the circuit breaker 010 in the thickness direction (the direction perpendicular to the surface of the movable contact 110). The second connecting portion 133 and the copper bar 140 are attached to each other, so that the connection stability can be improved.

Referring to fig. 4, optionally, in an implementation manner of the embodiment of the present invention, the conductive portions 131 include two conductive portions 131 arranged in parallel, the two conductive portions 131 are respectively located at two sides of the movable contact 110, and two ends of the second connection portion 133 are respectively connected to the two conductive portions 131, so that the current flowing through the wiring terminal 150 and the copper bar 140 can respectively flow into the two conductive portions 131 through the second connection portion 133 (arrow direction in fig. 4), so that two paths of current exist on one side of the arc 050 away from the arc extinguish chamber 020 to generate an electric repulsive force on the arc 050, thereby accelerating the transfer of the arc 050, and improving the service life of the movable contact 110 and the stationary contact 120 and the breaking capacity of the circuit breaker 010.

Referring to fig. 1 and fig. 2, an embodiment of the present invention further discloses a circuit breaker 010, which includes the contact loop 100 as described above. The circuit breaker 010 includes the same structure and advantageous effects as the contact circuit 100 in the foregoing embodiment. The structure and advantages of the contact circuit 100 have been described in detail in the foregoing embodiments, and are not repeated herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a contact return circuit (100), characterized in that, includes moving contact (110), static contact (120) and static contact support (130), the one end of static contact support (130) with static contact (120) electricity is connected, the other end is used for leading-in electric current, the one end of moving contact (110) with static contact (120) cooperate, the other end is used for deriving the electric current, moving contact (110) with static contact (120) divide the branch to divide and produce electric arc (050) and shift to explosion chamber (020), static contact support (130) include conductive part (131), conductive part (131) are located electric arc (050) keep away from one side of explosion chamber (020).

2. The contact circuit (100) of claim 1, wherein the static contact holder (130) further comprises a first connecting portion (132) for connecting with the static contact (120), the conductive portion (131) is plate-shaped, a plate surface of the conductive portion (131) is parallel to a side surface of the movable contact (110), and the first connecting portion (132) is perpendicular to the plate surface of the conductive portion (131).

3. The contact circuit (100) according to claim 2, wherein the conductive portions (131) comprise two conductive portions (131) arranged in parallel, two of the conductive portions (131) are respectively located at two sides of the movable contact (110), and two ends of the first connecting portion (132) are respectively connected to the two conductive portions (131).

4. The contact loop (100) of claim 2, wherein the first connection portion (132) and the stationary contact (120) are plate-shaped, and a plate surface of one side of the stationary contact (120) is matched with the movable contact (110), and a plate surface of the other side of the stationary contact is attached to the plate surface of the first connection portion (132).

5. The contact circuit (100) of claim 1, further comprising a copper bar (140) and a terminal (150), wherein one end of the copper bar (140) is electrically connected to the stationary contact holder (130), and the other end is electrically connected to the terminal (150).

6. The contact circuit (100) according to claim 5, wherein the static contact holder (130) further comprises a second connecting portion (133) connected to the other end of the conductive portion (131), the second connecting portion (133) is plate-shaped, and a plate surface of the second connecting portion (133) is attached to a surface of the copper bar (140).

7. The contact circuit (100) according to claim 6, wherein the conductive portions (131) comprise two conductive portions arranged in parallel, two conductive portions (131) are respectively located at two sides of the movable contact (110), and two ends of the second connecting portion (133) are respectively connected to the two conductive portions (131).

8. The contact circuit (100) of claim 6, wherein the stationary contact holder (130) and the copper bar (140) are integrally formed.

9. Contact circuit (100) according to any of claims 2 to 4, wherein the first connection portion (132) and the conductive portion (131) are provided integrally.

10. A circuit breaker (010) characterized by comprising a contact circuit (100) according to any of claims 1 to 9.