Arc striking angle, arc extinguishing system and circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, in particular to an arc striking angle, an arc extinguishing system and a circuit breaker, comprising an arc striking part which is sequentially connected with a fixing part and a connecting part; the connecting part is connected with a middle cover of the circuit breaker and is connected with a moving contact through a conductor; the arc striking part is located between the middle cover and the arc extinguish chamber, and a gap exists between the arc striking part and a grid piece of the arc extinguish chamber. When the circuit breaker breaks an arc, the arc root of the arc on the moving contact is transferred to the arc striking part, so that the time of the arc on the moving contact is shortened, and the ablation of the arc to the moving contact is greatly reduced. The arc root accelerates to move towards the direction of the arc extinguishing chamber under the action of a magnetic field generated by current on the arc striking part, so that the arc is promoted to enter the arc extinguishing grid plate, the arcing time is shortened, the risk of breakdown arcing of the contact in the opening and closing process is reduced, the current limiting capability of the circuit breaker is enhanced, and the product reliability is improved. The problem of contact material ablation caused by arc between the moving and static contacts is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to low voltage electric appliance technical field, concretely is a kind of arc leading angle, arc extinguishing system and circuit breaker. BACKGROUND

[0002] When the molded case circuit breaker breaks down fault current, due to the rapid change of current, strong electric field will be generated between moving contact and static contact, when electric field intensity is large enough, it will break down the medium (such as air) between contact, form conducting channel, i.e. arc. Arc has the characteristics of high temperature and high heat, temperature can reach thousands of degrees Celsius, accompanied by strong light and electromagnetic radiation. The existence of arc will consume a lot of electric energy, and generate a lot of heat, which will quickly heat the contact material, resulting in material melting, evaporation or even ablation. Excessive ablation of contact material will cause the surface of contact to become rough and uneven, increasing the contact resistance; at the same time, ablation may also form an insulating layer of oxide, hindering the passage of current. These factors will cause poor contact of contact, and even cause burning. Arc is inevitable in the process of molded case circuit breaker breaking down fault current, how to reduce the ablation of contact material by arc and improve the breaking capacity and reliability of circuit breaker is the key difficulty in the design of circuit breaker. SUMMARY

[0003] In view of the problem of contact material ablation caused by arc between moving contact and static contact in the prior art, the utility model provides a kind of arc leading angle, arc extinguishing system and circuit breaker.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

[0005] The utility model provides a kind of arc leading angle, including arc leading portion, the arc leading portion is sequentially connected with fixed part and connecting portion;The connecting portion is connected with the middle cover of circuit breaker, and is connected with moving contact by conductor;The arc leading portion is located between middle cover and arc extinguishing chamber, and there is gap between the louver of arc extinguishing chamber.

[0006] Optionally, the connecting hole is arranged at the top of the connecting portion, and is used to connect with the middle cover.

[0007] Optionally, the connecting end of the middle cover and the connecting portion is located between the included angle between the connecting portion and the fixed part.

[0008] Optionally, the arc leading portion and moving contact are equipotential.

[0009] Optionally, the included angle between the fixed part and the arc leading portion is less than 90 °.

[0010] Optionally, the conductor is wire or conductive plate.

[0011] Optionally, the moving contact and the conductor are connected by moving contact connecting plate.

[0012] Optionally, the arc striking part, the fixing part and the connecting part are integrated.

[0013] The utility model provides a kind of arc extinguishing system, including metal lattices group, moving contact, static contact, static arc angle and above-mentioned arc striking angle;

[0014] The metal lattices group is arranged in the radial extension direction of the moving contact relative to the opening and closing trajectory of the static contact, and is located between the arc striking angle and the static contact.

[0015] The static arc angle is arranged on the static contact, and there is a gap between the bottom end of the metal lattices group.

[0016] A circuit breaker, characterized in that it comprises the arc extinguishing system.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model discloses an arc striking angle, including arc striking part, the arc striking part is connected with fixed part and connecting part in proper order;Connecting part is connected with the middle cover of circuit breaker, and connecting with the moving contact of arc extinguishing chamber through conductor;The arc striking part is located between the middle cover and arc extinguishing chamber, and there is a gap between the lattices of arc extinguishing chamber.When the circuit breaker breaks arc, the arc root on the moving contact will be transferred to the arc striking part, thereby reducing the time of arc on the moving contact, greatly reducing the ablation of arc to the moving contact point.At the same time, when the arc root is transferred to the arc striking angle, the arc root will accelerate to the direction of arc extinguishing chamber under the action of the magnetic field generated by the current on the arc striking part, promote the arc to enter the arc extinguishing lattices, shorten the arc time, reduce the risk of arc reignition, reduce the risk of breakdown arc in the opening and closing process of contact, enhance the current limiting capacity of circuit breaker, improve the product reliability, the arc striking angle is simple in structure, low in cost, strong in arc striking capacity, and single in assembly, easy to realize.

[0019] Connecting hole is arranged on the top of connecting part, to realize the reliable connection between connecting part and middle cover.

[0020] The connecting end of end cover and connecting part is opposite the included angle between connecting part and fixed part, which can quickly keep the position of arc striking angle and lattices consistent during production and assembly, to accurately control the position of arc striking angle and lattices, further improve the arc striking capacity, and improve the assembly efficiency.

[0021] The arc striking part and the moving contact are equipotential, which can reduce the influence of electromagnetic interference on the system, greatly reduce the risk of electric shock caused by potential difference during operation, help to protect the safety of operating personnel, and prevent personal injury caused by accidental electric shock.

[0022] The included angle between the fixed part and the arc striking part is less than 90°, which can further improve the arc striking capacity of the arc striking angle.

[0023] The arc leading part, the fixing part and the connecting part are of an integrated structure, have better mechanical strength, are easy to process and produce and have low cost.

[0024] The utility model discloses still provide a kind of arc extinguishing system, including metal latticework, moving contact, static contact, static arc angle and above-mentioned arc leading angle;The metal latticework is arranged in the radial extension direction of the moving contact relative to the static contact opening and closing movement track, and it is located between arc leading angle and static contact;The static arc angle is arranged on static contact, and there is gap with the bottom end of metal latticework.This arc extinguishing chamber has longer service life, equipment maintenance is simple and cost is low.

[0025] A kind of circuit breaker, including above-mentioned arc extinguishing system.The circuit breaker is better in reliability and safety, equipment structure is simple, and service life is longer. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic view of the arc leading angle installation position structure of the utility model.

[0027] Figure 2 It is a schematic view of the arc leading angle structure of the utility model.

[0028] Figure 3 It is the schematic view of the arc extinguishing system structure of the utility model.

[0029] Wherein, 1-arc leading angle, 2-middle cover, 3-arc extinguishing chamber, 4-conductor, 5-moving contact, 6-moving contact connecting plate, 7-static contact, 8-static arc angle, 101-arc leading part, 102-fixing part, 103-connecting part, 301-metal latticework. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantage of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be clearly and completely described below in conjunction with the drawings in the utility model embodiment, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment.Usually the components of the utility model embodiment described and shown in the drawing here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model.Based on the embodiment in the utility model, all other embodiments obtained by ordinary skilled person in the art without making creative efforts belong to the scope of protection of the utility model.

[0032] It should be noted that like reference numerals and letters refer to like items in the several views, and once an item is defined in one view, it need not be further defined and explained in the subsequent views.

[0033] In the description of the embodiments of the utility model, it needs to be explained that if the terms "upper", "lower", "horizontal", "inner" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly used when the utility model product is used, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0034] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0035] In the description of the embodiments of the utility model, it also needs to be explained that unless otherwise explicitly specified and limited, if the terms "set", "install", "connect", "connect" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] The utility model will be further described in detail below in combination with specific embodiments, which are an explanation of the utility model rather than a limitation.

[0037] Embodiment 1

[0038] Referring to Figure 1 and Figure 2 The utility model discloses an arc striking angle, including arc striking part 101, arc striking part 101 is connected with fixed part 102 and connecting part 103 in proper order, connecting part 103 is connected with the middle cover 2 of circuit breaker, and is connected with the movable contact 5 of arc extinguishing chamber 3 through conductor 4, arc striking part 101 is located between middle cover 2 and arc extinguishing chamber 3, and there is a gap between the louver of arc extinguishing chamber 3.

[0039] When the circuit breaker breaks the arc, the arc root on the moving contact will be transferred to the arc striking portion, thereby reducing the arc time on the moving contact and greatly reducing the arc ablation of the moving contact. Meanwhile, after the arc root is transferred to the arc striking angle, the arc root will be accelerated to move in the direction of the arc extinguishing chamber under the action of the magnetic field generated by the current on the arc striking portion, promoting the arc to enter the arc extinguishing grid and shortening the arc burning time and reducing the arc reignition risk.

[0040] Embodiment 2

[0041] Referring to Figure 1 and Figure 2 The utility model discloses a kind of arc striking angles, including arc striking portion 101, the arc striking portion 101 is connected with fixed portion 102 and connecting portion 103 in turn;The connecting end of end cover 2 and connecting portion 103 is in the included angle between connecting portion 103 and fixed portion 102, connecting portion 103 is equipped with connecting hole in top, connecting portion 103 is connected with the middle cover 2 of circuit breaker by connecting hole, and connecting portion 103 is connected with moving contact connecting plate 6 by conductor 4, the moving contact connecting plate 6 is connected with the moving contact 5 of arc extinguishing chamber 3, and the conductor 4 is soft conductor wire or hard conductive plate;The arc striking portion 101 and moving contact 5 are equipotential, the arc striking portion 101 is between middle cover 2 and arc extinguishing chamber 3, and there is gap between the grid sheet of arc extinguishing chamber 3.

[0042] Embodiment 3

[0043] Referring to Figure 1 and Figure 2 The utility model discloses a kind of arc striking angles, including arc striking portion 101, the arc striking portion 101 is connected with fixed portion 102 and connecting portion 103 in turn;The included angle between connecting portion 103 and fixed portion 102 is consistent with the included angle of the connecting end outer wall of end cover 2 and connecting portion 103, the connecting end of end cover 2 and connecting portion 103 is in the included angle between connecting portion 103 and fixed portion 102, connecting portion 103 is equipped with connecting hole in top, connecting portion 103 is connected with the middle cover 2 of circuit breaker by connecting hole, and connecting portion 103 is connected with moving contact connecting plate 6 by conductor 4, the moving contact connecting plate 6 is connected with the moving contact 5 of arc extinguishing chamber 3, and the conductor 4 is soft conductor wire or hard conductive plate;The arc striking portion 101 and moving contact 5 are equipotential, the arc striking portion 101 is between middle cover 2 and arc extinguishing chamber 3, and there is gap between the grid sheet of arc extinguishing chamber 3. Preferably, the arc striking portion 101 is bent to moving contact 5 direction, and the distance from the end of arc striking portion 101 to the end of middle cover 2 close to arc extinguishing chamber 3 is greater than the distance from the end of grid sheet to the end of middle cover 2 close to arc extinguishing chamber 3. The fixed portion 102 and arc striking portion 101 constitute L type structure, and the included angle between fixed portion 102 and arc striking portion 101 is less than 90 °, with better arc striking ability;The arc striking portion 101, fixed portion 102 and connecting portion 103 are integrated structure.

[0044] Embodiment 4

[0045] Referring to Figure 3 The utility model provides a kind of arc extinguishing system, including metal lath group 301, moving contact 5, static contact 7, static arc angle 8 and above-mentioned arc leading angle 1;

[0046] The metal lath group 301 includes several mutually spaced metal lath, and adjacent metal lath is fixedly installed between two pieces of insulating clamping plate, the metal lath group 301 is arranged in the radial extension direction of the opening and closing movement track of the moving contact 5 relative to the static contact 7, and located between arc leading angle 1 and static contact 7;

[0047] The static arc angle 8 is arranged on the static contact 7, and there is a gap between the bottom end of the metal lath group 301.

[0048] The arc extinguishing chamber 3 has a longer service life, and the equipment is simple to maintain and low in cost.

[0049] Embodiment 5

[0050] The utility model provides a kind of circuit breaker, including above-mentioned arc extinguishing system and arc leading angle 1, the arc extinguishing system is arranged in the inside of circuit breaker, and located below middle cover 2, the middle cover 2 is connected with arc leading angle 1;

[0051] The arc leading angle 1 includes arc leading part 101, the arc leading part 101 is sequentially connected with fixed part 102 and connecting part 103;End cover 2 is connected with connecting part 103, and the connecting end of end cover 2 and connecting part 103 is located between the included angle between connecting part 103 and fixed part 102, so that connecting part 103 and arc leading part 101 are located on the upper and lower sides of the connecting end of end cover 2 and connecting part 103;Connecting part 103 is connected with the moving contact 5 of arc extinguishing chamber 3 by conductor 4;The arc leading part 101 is located between middle cover 2 and arc extinguishing chamber 3, and there is a gap between the lath of arc extinguishing chamber 3.

[0052] The arc extinguishing system includes metal lath group 301, moving contact 5, static contact 7 and static arc angle 8;The metal lath group 301 includes several mutually spaced metal lath, and adjacent metal lath is fixedly installed between two pieces of insulating clamping plate, the metal lath group 301 is arranged in the radial extension direction of the opening and closing movement track of the moving contact 5 relative to the static contact 7, and located between arc leading angle 1 and static contact 7;

[0053] The static arc angle 8 is arranged on the static contact 7, and there is a gap between the bottom end of the metal lath group 301.

[0054] The circuit breaker has better reliability and safety, and has simple structure and longer service life.

[0055] In summary, the utility model provides a kind of arc leading angle, arc extinguishing system and circuit breaker, by fixed mounting arc leading angle 1 on circuit breaker cover 2, arc leading angle 1 has the arc leading portion 101 being arranged above movable contact 5 and arc extinguishing grid piece, when circuit breaker breaks arc, arc root on movable contact 5 will shift to arc leading portion 101, to reduce the time of arc on movable contact 5, greatly reduce the ablation of arc to movable contact point.Meanwhile, when arc root shifts to arc leading angle 1, arc root will accelerate to the direction of arc extinguishing chamber 3 under the magnetic field effect of current on arc leading portion, promote arc to enter arc extinguishing grid piece, to avoid the problem of contact material ablation caused by arc between movable contact and static contact.

[0056] The above is only the preferred embodiment of the utility model, and does not use to make any limit to the technical scheme of the utility model, and those skilled in the art should understand that, without departing from the spirit and principles of the utility model, the technical scheme can be modified and replaced in several simple ways, and these modifications and replacements also belong to the protection scope covered by the claims.

Claims

1. An arc initiation horn characterized by, The arc striking part (101) is sequentially connected with the fixed part (102) and the connecting part (103); the connecting part (103) is connected with the middle cover (2) of the circuit breaker and connected with the moving contact (5) through the conductor (4); the arc striking part (101) is located between the middle cover (2) and the arc extinguishing chamber (3) and has a gap with the grid fins of the arc extinguishing chamber (3).

2. The arc initiation horn of claim 1, wherein, The connecting hole is arranged at the top of the connecting part (103) and used for connecting with the middle cover (2).

3. The arc initiation horn of claim 1, wherein, The connecting end of the middle cover (2) and the connecting part (103) is located between the included angle between the connecting part (103) and the fixed part (102).

4. The arc initiation horn of claim 1, wherein, The arc striking part (101) and the moving contact (5) are equipotential.

5. The arc initiation horn of claim 1, wherein, The included angle between the fixed part (102) and the arc striking part (101) is less than 90°.

6. The arc initiation horn of claim 1, wherein, The conductor (4) is a wire or a conductive plate.

7. The arc initiation horn of claim 1, wherein, The moving contact (5) and the conductor (4) are connected through the moving contact connecting plate (6).

8. The arc initiation horn of any one of claims 1-7, wherein, The arc striking part (101), the fixed part (102) and the connecting part (103) are integrated.

9. An arc quenching system characterized by, The arc striking system comprises the metal grid fin group (301), the moving contact (5), the static contact (7), the static arc horn (8) and the arc striking horn according to any one of claims 1-8. The metal grid fin group (301) is arranged in the radial extension direction of the moving contact (5) relative to the static contact (7) in the opening and closing movement track and located between the arc striking horn (1) and the static contact (7). The static arc horn (8) is arranged on the static contact (7) and has a gap with the bottom end of the metal grid fin group (301).

10. A circuit breaker characterized by, The arc extinguishing system comprises the arc extinguishing system according to claim 9.

Images