阅读说明：本技术 一种灭弧装置 (Arc extinguishing device ) 是由 丁飞 曹健 张明学 于 2019-03-21 设计创作，主要内容包括：一种灭弧装置,它包括静触头(1),灭弧室(2)装在所述静触头(1)上方,所述灭弧室(2)的灭弧栅片的栅脚(201)伸入产气罩(3)内,动触头(4)与静触头(1)的接合与断开控制着断路器的通断,其特征在于：通过对灭弧装置结构的改进,增加相关部分的隔弧构件,提高了加快了断路器灭弧室内电弧的熄灭速度,有效防止了分断大电流时,产生的气流往动触头一侧移动从而损坏断路器的缺陷。同时用绝缘件的自身结构特征对静触头、灭弧室和导磁块进行定位,降低断路器的维修调试难度。还增加对灭弧室灭弧栅片布局结构的改进,使得断路器在高电压使用环境中进一步有效对触点断开时产生的电弧拉长、分断、熄灭。提升断路器的分断性能。(The utility model provides an arc control device, it includes static contact (1), and explosion chamber (2) are adorned static contact (1) top, in bars foot (201) of the arc extinguishing bars piece of explosion chamber (2) stretched into gas production cover (3), the break-make of circuit breaker, its characterized in that are being controlled with the disconnection to the joint of moving contact (4) and static contact (1): through the improvement to the arc control device structure, increase relevant partial arc component that separates, improved the speed of extinguishing of the electric arc in having accelerated the circuit breaker arc extinguish chamber, thereby when having effectively prevented breaking the heavy current, the air current that produces moves the defect that damages the circuit breaker toward moving contact one side. Meanwhile, the static contact, the arc extinguish chamber and the magnetic conduction block are positioned by using the self structural characteristics of the insulating part, so that the maintenance and debugging difficulty of the circuit breaker is reduced. And the improvement on the layout structure of arc extinguishing grid pieces of the arc extinguishing chamber is also added, so that the circuit breaker further effectively elongates, breaks and extinguishes the electric arc generated when the contact is disconnected in a high-voltage use environment. The breaking performance of the circuit breaker is improved.)

1. The utility model provides an arc control device, it includes static contact (1), and explosion chamber (2) are adorned static contact (1) top, in bars foot (201) of the arc extinguishing bars piece of explosion chamber (2) stretched into gas production cover (3), the break-make of circuit breaker, its characterized in that are being controlled with the disconnection to the joint of moving contact (4) and static contact (1): the gas generating cover (3) comprises a left chamber (301) and a right chamber (302), grid pins (201) of arc extinguishing grid pieces of the arc extinguishing chambers (2) extend into isolation grooves (301a,302a) in the corresponding left chamber (301) and right chamber (302), at least one isolation rib (303, 303 ') is arranged at the bottom of the left chamber (301) and the right chamber (302), and the isolation ribs (303, 303') are positioned between the magnetic conduction block (5) and the static silver points (101) on the static contact (1) to isolate the two from each other.

2. An arc extinguishing device according to claim 1, characterized in that: the distance between the bottom of the groove (202) of the arc extinguishing grid piece of the arc extinguishing chamber (2) and the outer side end (305) of the gas generating cover (3) is not more than 2 mm.

3. An arc extinguishing device according to claim 1, characterized in that: a connecting block (304) is arranged between the bottoms of the left cavity (301) and the right cavity (302), and the connecting block (304) is located on the outer side of the static contact (101) and above the static contact (1).

4. An arc extinguishing device according to claim 1, characterized in that: the moving contact (4) is fixedly provided with a moving contact gas generating element (6), and the moving contact gas generating element (6) is positioned between the moving contact (4) and the static contact (1).

5. An arc extinguishing apparatus according to claim 4, wherein: the moving contact gas generating piece (6) is of a U-shaped structure, and the bottom surface of the U-shaped structure is located between the moving contact (4) and the static contact (1).

6. An arc extinguishing device according to claim 1, characterized in that: the left chamber (301) and the right chamber (302) are integrated.

7. An arc extinguishing device according to claim 1, characterized in that: the insulating part (7) is located on the inner side of the U-shaped bend of the static contact (1), the insulating part (7) covers from the inner side of the U-shaped bend of the static contact (1) and at least extends to the bend position of the upper portion of the static contact (1), and a positioning structure is arranged on the insulating part (7) and can position the arc extinguish chamber (2) and the magnetic conduction block (5) and enable the insulating part (7) to achieve self-limiting when the static contact (1) is installed.

8. An arc extinguishing apparatus according to claim 7, wherein: the positioning structure comprises a groove (701) formed in the insulating part (7) and used for positioning and installing the magnetic conduction block (5) in the U-shaped bend of the static contact (1), protrusions (702,702') extending upwards from two side edges of the insulating part (7) can position the arc extinguish chamber (2), and a downward convex block (703) is arranged on at least one side of the insulating part (7) and can enable the insulating part (7) to achieve self-limiting when the insulating part (7) is installed in the static contact (1).

9. An arc extinguishing apparatus according to claim 8, wherein: the protrusion (702,702') extends into the arc extinguish chamber (2) to stick to the inner cavity wall of the arc extinguish chamber (2) so as to realize the positioning of the arc extinguish chamber (2).

10. An arc extinguishing apparatus according to claim 8, wherein: the bump (703) extends to the lower part of the contact surface of the lower part of the insulating part (7) and the static contact (1).

11. An arc extinguishing device according to claim 1, characterized in that: the arc extinguishing grid plate of the arc extinguishing chamber (2) sequentially comprises an arc striking plate (203), an upper arc extinguishing grid plate group (204), a middle arc extinguishing grid plate group (205) and a bottom arc extinguishing grid plate group (206) from top to bottom, the length of one side, facing the moving contact (4), of the upper arc extinguishing grid plate group (204) is shorter than the length of one side, facing the moving contact (4), of the middle arc extinguishing grid plate group (205), the upper arc extinguishing grid plate group (204) is in fan-shaped distribution from top to bottom from one side, facing the moving contact (4), of the upper arc extinguishing grid plate group (204), the curve track formed by the end, facing one side of the moving contact (4), of the upper arc extinguishing grid plate group (204) corresponds to the motion track of the moving contact (4), the length of one side, facing the moving contact (4), of the bottom arc extinguishing grid plate group (206) is shorter than the length, the middle arc-extinguishing grid group (205) and the bottom arc-extinguishing grid group (206) are parallel to each other, and the thicknesses of the top arc-striking plate (203) and the bottom arc-extinguishing grid group (206) are larger than those of the upper arc-extinguishing grid group (204) and the middle arc-extinguishing grid group (205).

12. An arc extinguishing apparatus according to claim 11, wherein: the connecting line of the end of one side of the middle arc-extinguishing grid group (205) and the end of one side of the bottom arc-extinguishing grid group (206) far away from the moving contact (4) is a straight line, the connecting line of the end of one side of the upper arc-extinguishing grid group (204) far away from the moving contact (4) is a smooth curve, and the connecting position of the connecting line of the end of one side of the middle arc-extinguishing grid group (205) far away from the moving contact (4) and the connecting position of the connecting line of the end of one side of the upper arc-extinguishing grid group.

13. An arc extinguishing apparatus according to claim 11, wherein: the top arc striking plate (203) comprises a base part (203a) and an end part (203b), the end part (203b) protrudes out of the base part (203) and inclines upwards, and the base part (203a) and the end part (203b) are V-shaped.

14. An arc extinguishing apparatus according to claim 11, wherein: the number of the arc striking plates (203) is preferably 1, the number of the upper arc-extinguishing grid group (204) is preferably 5-9, the number of the middle arc-extinguishing grid group (205) is preferably 11-15, and the number of the bottom arc-extinguishing grid group (206) is preferably 1-3.

Technical Field

The invention belongs to the technical field of low-voltage circuit breakers, and particularly relates to an arc extinguishing device.

Background

The circuit breaker is the most important distribution equipment in a low-voltage distribution system, along with the continuous improvement of the requirements of power supply and power transmission and distribution equipment in power engineering, the performance requirements for a circuit protection switch are higher and higher, and the miniaturization, high performance, modularization and high reliability are the main development directions of the air circuit breaker at the present stage. The contact and the arc extinguishing system are important components of the circuit breaker, and the shape and the size design of the contact in the contact system are very critical and directly relate to the electrical service life and the breaking capacity of the circuit breaker.

An arc extinguishing chamber in the circuit breaker plays roles of lengthening, breaking and extinguishing an electric arc generated when a contact is broken in a short-circuit fault, but the conventional arc extinguishing chamber structure is easy to generate electric breakdown in the processes of lengthening, breaking and extinguishing the electric arc generated when the contact is broken in a high-voltage environment, so that long-time arc burning is finally caused, and the breaking performance of the circuit breaker is reduced. When the large current is cut off, the generated airflow moves to one side (mechanism side) of the moving contact to drive the electric arc to move inwards, so that the circuit breaker mechanism is burnt out.

Disclosure of Invention

The invention aims to overcome the technical defect that the arc extinguishing effect of the arc extinguishing chamber in the prior art is poor, and provides the arc extinguishing device, which improves the structure of the arc extinguishing device, increases the arc isolating components of related parts, further improves the arc extinguishing speed in the arc extinguishing chamber of the circuit breaker, particularly further improves the capabilities of lengthening, breaking and extinguishing the arc generated when a contact is disconnected under a high-voltage environment, and effectively prevents the defect that the circuit breaker is damaged due to the fact that the generated airflow moves towards one side of a moving contact when a large current is broken.

Technical scheme

In order to achieve the technical purpose, the invention provides an arc extinguishing device, which comprises a fixed contact, wherein an arc extinguishing chamber is arranged above the fixed contact, a grid pin of an arc extinguishing grid sheet of the arc extinguishing chamber extends into a gas production cover, and the connection and disconnection of a movable contact and the fixed contact control the on-off of a circuit breaker, and is characterized in that: the gas production cover comprises a left cavity and a right cavity, grid pins of arc extinguishing grid pieces of the arc extinguishing chambers extend into isolating grooves in the corresponding left cavity and the right cavity, at least one isolating rib is correspondingly arranged at the bottoms of the left cavity and the right cavity, and the isolating ribs are positioned between the magnetic conduction blocks and the static silver points on the static contacts to isolate the magnetic conduction blocks and the static silver points from each other.

Furthermore, the distance between the bottom of the groove of the arc extinguishing grid piece of the arc extinguishing chamber and the outer side end of the gas production cover is not more than 2 mm.

Furthermore, a connecting block is arranged between the bottoms of the left cavity and the right cavity and is positioned outside the static contact and above the static contact.

Furthermore, a moving contact gas generating piece is fixedly arranged on the moving contact and is positioned between the moving contact and the static contact.

Furthermore, the moving contact gas generating piece is of a U-shaped structure, and the bottom surface of the U-shaped structure is located between the moving contact and the static contact.

Further, the left chamber and the right chamber are integrated.

Furthermore, the insulating part is positioned on the inner side of the U-shaped bend of the static contact, the insulating part starts to cover from the inner side of the U-shaped bend of the static contact and at least extends to the bend part on the upper part of the static contact, and a positioning structure is arranged on the insulating part and can position the arc extinguish chamber and the magnetic conduction block and enable the insulating part to realize self-limiting when the static contact is installed.

Furthermore, the positioning structure comprises a groove arranged on the insulating part and used for positioning and installing a magnetic conduction block in the U-shaped bend of the static contact, two side edges of the insulating part extend upwards to form bulges so as to position the arc extinguish chamber, and at least one side of the insulating part is provided with a downward convex block so as to enable the insulating part to realize self-limiting when the static contact is installed.

Furthermore, the protrusion extends into the arc extinguish chamber and is attached to the inner cavity wall of the arc extinguish chamber to realize the positioning of the arc extinguish chamber.

Further, the lug extends to the lower part of the contact surface of the lower part of the insulating part and the fixed contact.

Further, the arc extinguishing grid pieces of the arc extinguishing chamber sequentially comprise an arc striking piece, an upper arc extinguishing grid piece group, a middle arc extinguishing grid piece group and a bottom arc extinguishing grid piece group from top to bottom, the length of the upper arc-extinguishing grid plate group towards one side of the moving contact is shorter than that of the middle arc-extinguishing grid plate group towards one side of the moving contact, the upper arc-extinguishing grid group is distributed in a sector shape from top to bottom from the side facing the moving contact to the side far away from the moving contact, the curve track formed by the end head of the upper arc-extinguishing grid sheet group facing one side of the moving contact corresponds to the moving track of the moving contact, the length of the bottom arc-extinguishing grid plate group towards one side of the moving contact is shorter than that of the middle arc-extinguishing grid plate group towards one side of the moving contact, the middle arc-extinguishing grid plate group and the bottom arc-extinguishing grid plate group are parallel to each other, and the thickness of the top arc striking plate and the thickness of the bottom arc-extinguishing grid plate group are larger than that of the upper arc-extinguishing grid plate group and the middle arc-extinguishing grid plate group.

Furthermore, the connecting line of the end of the middle arc-extinguishing grid group and the end of the bottom arc-extinguishing grid group far away from one side of the moving contact are straight lines, the connecting line of the end of the upper arc-extinguishing grid group far away from one side of the moving contact is a smooth curve, and the connecting part of the connecting line of the end of the middle arc-extinguishing grid group far away from one side of the moving contact and the connecting line of the end of the upper arc-extinguishing grid group far away from one side of.

Further, the top arc striking plate comprises a base and an end, the end protrudes out of the base and inclines upwards, and the base and the end are V-shaped.

Preferably, the number of the arc striking plates is preferably 1, the number of the upper arc-extinguishing grid plate groups is preferably 5-9, the number of the middle arc-extinguishing grid plate groups is preferably 11-15, and the number of the bottom arc-extinguishing grid plate groups is preferably 1-3.

Advantageous effects

According to the arc extinguishing device provided by the invention, through the improvement on the structure of the arc extinguishing device, the arc isolating components of related parts are added, the extinguishing speed of the arc in the arc extinguishing chamber of the circuit breaker is increased, particularly, the elongation, breaking and extinguishing capabilities of the arc generated when a contact is disconnected under a high-voltage environment are further improved, and the defect that the circuit breaker is damaged due to the fact that the generated airflow moves to one side of the moving contact when a large current is broken is effectively avoided. Meanwhile, the static contact, the arc extinguish chamber and the magnetic conduction block are positioned by using the self structural characteristics of the insulating part, so that the maintenance and debugging difficulty of the circuit breaker is reduced. And the improvement on the layout structure of arc extinguishing grid pieces of the arc extinguishing chamber is also added, so that the circuit breaker further effectively elongates, breaks and extinguishes the electric arc generated when the contact is disconnected in a high-voltage use environment. The breaking performance of the circuit breaker is improved.

Drawings

FIG. 1 is a perspective view of an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of the position of the spacer bar in the embodiment of the invention.

Fig. 3 is a schematic view of a position structure of a connecting block in the embodiment of the invention.

Fig. 4 is a schematic diagram of a position structure of a groove in the embodiment of the invention.

FIG. 5 is a schematic structural diagram of a gas generating hood according to an embodiment of the present invention.

Fig. 6 is a schematic structural view of an insulating member according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of a stationary contact structure according to an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of an arc chute in an embodiment of the invention.

Fig. 9 is a schematic diagram of a position structure of an arc chute in an embodiment of the invention.

Fig. 10 is a schematic view of a position structure of an arc runner in an embodiment of the invention.

FIG. 11 is a schematic structural diagram of an arc runner in an embodiment of the invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.