CN220585172U - Improved breaker contact arc extinguishing system - Google Patents

Abstract

An improved circuit breaker contact arc extinguishing system belongs to the technical field of arc extinguishing systems of circuit breakers. Including contact system and explosion chamber, contact system includes moving contact and stationary contact to the moving contact includes first movable contact piece, and the explosion chamber is located one side of moving contact opening direction, the explosion chamber includes the bars of array, is equipped with the movable arc striking piece in the one end of the corresponding movable contact of bars of array, first movable contact piece orientation the one end of bars constitutes as the swing end be provided with on the swing end be used for blocking the arc root of electric arc on the swing end to the arc-proof moving part of the direction removal of movable arc striking piece. The advantages are that: the arc root moving part for blocking the arc to move towards the movable striking plate on the swinging end is arranged on the swinging end formed by the first movable contact piece of the movable contact towards one end of the grid piece of the arc extinguishing chamber, so that the movement range of the arc root can be limited, the arc distribution can be controlled, and the electric field distribution can be controlled, thereby reliably breaking.

Description

Improved breaker contact arc extinguishing system

Technical Field

The utility model belongs to the technical field of arc extinguishing systems of circuit breakers, and particularly relates to an improved circuit breaker contact arc extinguishing system.

Background

The arc extinguishing system of the circuit breaker has the function of extinguishing the electric arc generated by the contact when the circuit is cut off. Large-sized air circuit breakers (also referred to in the industry as "air switches", hereinafter also) generally employ a multi-contact structure, having a main contact for carrying an electric current and an arcing contact for breaking the electric current. In the action mechanism, the arc contact is firstly combined and then separated relative to the main contact, and when the breaker breaks, the arc is only generated on the arc contact. For better breaking of the current, the arcing contact typically extends into the arc chute, i.e. into the grid cavities of the grid of the array, herein referred to as the area between the pair of grid legs of the arc chute. There is room for improvement in the prior art.

Disclosure of Invention

The utility model aims to provide an improved breaker contact arc extinguishing system which can limit the movement range of an arc root and control the distribution of an arc so as to reliably break.

The utility model aims at achieving the task, and an improved circuit breaker contact arc extinguishing system comprises a contact system and an arc extinguishing chamber, wherein the contact system comprises a moving contact and a fixed contact, the moving contact comprises a first moving contact piece, the arc extinguishing chamber is positioned at one side of the opening direction of the moving contact, the arc extinguishing chamber comprises an array grid piece, a moving striking plate is arranged at one end of the array grid piece, corresponding to the moving contact, of the first moving contact piece, one end of the first moving contact piece, facing the grid piece, is formed into a swinging end, and an arc preventing moving piece for preventing an arc root of an arc from moving towards the moving striking plate at the swinging end is arranged at the swinging end.

In a specific embodiment of the present utility model, the arc extinguishing chamber further includes a static striking plate, the dynamic striking plate and the static striking plate are respectively located at two ends of the grid plates of the array, and the lower parts of the dynamic striking plate and the static striking plate extend towards the contact system in a state of being opposite to each other to form a horn shape which gradually narrows from top to bottom.

In another specific embodiment of the present utility model, a first movable contact is fixed on a downward side of the swinging end of the first movable contact facing one end of the grid of the array, and an arc striking part is formed on the swinging end and extends in a direction away from the first movable contact; the arc-preventing moving part is sleeved on the arc striking part.

In a further specific embodiment of the utility model, the arc-preventing moving member is a sleeve-shaped structure having an arc striking part accommodating cavity and having an arc striking part insertion opening formed at one side for inserting the arc striking part into the arc striking part accommodating cavity, the arc striking part accommodating cavity is shaped and sized to accommodate the arc striking part, and the arc striking part is inserted into the arc striking part accommodating cavity from the arc striking part insertion opening.

In still another specific embodiment of the present utility model, the moving contact further includes a second moving contact, the first moving contact and the second moving contact are arranged side by side, the second moving contact is distributed on two sides of the first moving contact, the length of the first moving contact is greater than that of the second moving contact, a second moving contact is arranged on the second moving contact, and the first moving contact is located above the second moving contact; the grid plates comprise long grid plates and short grid plates, the long grid plates are arranged in parallel, the short grid plates are arranged in two rows, and the short grid plates are respectively positioned at two ends of the long grid plates in the array direction.

In still another specific embodiment of the present utility model, a first movable contact is fixed to a side of the first movable contact facing downward from the swing end of the first movable contact facing the end of the grid of the array, and the arc preventing moving member is fixed to both a swing end face of the swing end and a swing end side of the opposite side to the first movable contact.

In a further specific embodiment of the present utility model, the arc-preventing moving member is constructed of a swing end face fixing plate and a swing end side face fixing plate in a l-shaped configuration, the swing end face fixing plate being fixed to the swing end face of the swing end, and the swing end side face fixing plate being fixed to the swing end side face.

In a further specific embodiment of the present utility model, a first movable contact is fixed to a side of the first movable contact facing downward from the swinging end of the first movable contact facing the grid of the array, and the arc-preventing moving member has a hood-like structure having a triangular inner cavity and an inner cavity opening formed at one side of the triangular inner cavity and is simultaneously hood-fitted to an upper portion of a swinging end face of the swinging end and an upper portion of a swinging end side of the opposite side to the first movable contact.

In yet another specific embodiment of the present utility model, the arc preventing moving member includes a lower portion, a side portion and a top portion, wherein the lower portion is located below the first movable contact of the first movable contact, the side portion is located at two sides of the first movable contact, and the top portion is sleeved on the arc striking portion of the first movable contact.

In yet another particular embodiment of the utility model, the lower portion, side portion and top portion are integrally formed.

In yet another embodiment of the present utility model, the arc prevention moving member is an insulating member.

The technical scheme provided by the utility model has the technical effects that: the arc root moving part for blocking the arc to move towards the movable striking plate on the swinging end is arranged on the swinging end formed by the first movable contact piece of the movable contact towards one end of the grid piece of the arc extinguishing chamber, so that the movement range of the arc root can be limited, the arc distribution can be controlled, and the electric field distribution can be controlled, thereby reliably breaking.

Drawings

FIG. 1 is a diagram of a first embodiment of the present utility model;

FIG. 2 is a schematic view of the arc preventing moving member shown in FIG. 1 sleeved on a swinging end of the first movable contact piece facing one end of the grid piece;

fig. 3 is a detailed structural view of the first movable contact shown in fig. 1 and 2;

FIG. 4 is a block diagram of the arc prevention moving member shown in FIGS. 1 and 2;

FIG. 5 is a schematic view of FIG. 4, as viewed 90 from the left;

FIG. 6 is a schematic illustration of FIG. 1 with the arc on the sway end removed from the arc prevention mobile;

FIG. 7 is a schematic view of an arc with an arc prevention moving member sleeved on the swing end shown in FIG. 1;

FIG. 8 is a diagram of a second embodiment of the arc preventing moving member of the present utility model disposed at a swinging end of the first movable contact toward one end of the grid plate;

FIG. 9 is a block diagram of the arc prevention moving member shown in FIG. 8;

FIG. 10 is a diagram of a third embodiment of an arc preventing moving member of the present utility model disposed at a swinging end of a first movable contact toward one end of a grid plate;

FIG. 11 is a block diagram of the arc prevention moving member shown in FIG. 10;

FIG. 12 is a diagram of a fourth embodiment of the arc preventing moving member of the present utility model disposed at a swinging end of the first movable contact toward one end of the grid plate;

FIG. 13 is a diagram showing a fifth embodiment of the arc preventing moving member of the present utility model disposed at a swinging end of the first movable contact toward one end of the grid plate;

FIG. 14 is a diagram of a sixth embodiment of the present utility model;

FIG. 15 is a seventh embodiment of the present utility model;

FIG. 16 is a schematic view of a side of an arc prevention moving member in a seventh embodiment of the present utility model;

fig. 17 is a schematic view of the other side of the arc prevention moving member in the seventh embodiment of the present utility model.

Detailed Description

In order to make the technical spirit and advantages of the present utility model more clearly understood, the applicant will now make a detailed description by way of example, but the description of the examples is not intended to limit the scope of the utility model, and any equivalent transformation made merely in form, not essentially, according to the inventive concept should be regarded as the scope of the technical solution of the present utility model.

In the following description, any concepts related to the directions or azimuths of the up, down, left, right, front and rear are exemplified based on the position states of the drawing being described, and thus, it should not be construed as a specific limitation on the technical solution provided by the present utility model.

Example 1

Referring to fig. 1, fig. 1 shows a contact system 1 and an arc extinguishing chamber, wherein the contact system 1 comprises a moving contact 11 and a fixed contact 12, and the contact 11 is contacted with or separated from the fixed contact 12 after acting, so as to realize the closing or opening of the contact system. The moving contact 11 includes a first moving contact piece 111, an arc extinguishing chamber is positioned at one side of the opening direction of the moving contact 11, the arc extinguishing chamber includes an array of grating pieces 3, and one end of the first moving contact piece 111 facing the grating pieces 3 is configured as a swinging end.

The technical key points of the technical scheme provided by the utility model are as follows: an arc-preventing moving member 2 for preventing an arc root of the arc 200 from moving in the direction of the movable striking plate 4 at the swinging end is provided at the swinging end.

The movable contact 11 further includes a second movable contact 112, the first movable contact 111 and the second movable contact 112 are arranged side by side, the second movable contact 112 is distributed on two sides of the first movable contact 111, the length of the first movable contact 111 is longer than that of the second movable contact 112, that is, the end of the first movable contact 111 passes over the end of the second movable contact 112 and extends toward the direction of the arc extinguishing chamber, the second movable contact 112 is located outside the arc extinguishing chamber, a second movable contact 1121 is disposed on the second movable contact 112, and the first movable contact 1111 is located above the second movable contact 1121 (the position state shown in fig. 1 is an example); the grid 3 includes a long grid and a short grid, the long grid is a plurality of long grids and is arranged together, and the short grid is two rows and is respectively positioned at two ends of the long grid in the array direction.

In the present embodiment, the number of the first movable contacts 111 is one, and the number of the second movable contacts 112 is plural, for example, four each are disposed on both sides of the first movable contacts 111, but the specific number of the second movable contacts 112, that is, the number of the second movable contacts 112 disposed on the side of the first movable contacts 111 is not limited to the number shown in fig. 1 in the present embodiment.

Referring to fig. 6 to 7 in combination with fig. 1, the arc extinguishing chamber further includes a movable striking plate 4 and a static striking plate 5, the movable striking plate 4 and the static striking plate 5 are respectively located at two ends of the array of the grid plates 3 of the array in the array direction, and the lower parts of the movable striking plate 4 and the static striking plate 5 extend toward the contact system 1 in a state of being close to each other, so as to form a horn mouth shape gradually narrowing from top to bottom. Wherein, the moving arc striking piece 4 corresponds to the moving contact 11, and the static arc striking piece 5 corresponds to the static contact 12.

The stationary contact 12 includes a conductive block, on which a stationary arc contact and a stationary contact are disposed, the stationary arc contact corresponds to the first movable contact 1111, and the stationary contact corresponds to the second movable contact 1121, i.e., the stationary arc contact is located above the stationary contact.

As shown in fig. 1, each of the array of grid plates 3 has a pair of grid plate legs extending toward the contact system 1 and forming a recess therebetween, in which the first movable contact 1111 is located.

Referring to fig. 2 to 3 and referring to fig. 1, a first movable contact 1111 is fixed to a side of the first movable contact 111 facing downward from the swing end of the first movable contact 111 facing one end of the grid 3 of the array, and an arc striking portion 1112 is formed on the swing end, and the arc striking portion 1112 extends in a direction away from the first movable contact 1111; the arc prevention moving member 2 is sleeved on the arc striking portion 1112.

In the present embodiment, the aforementioned first movable contact 111 shown in fig. 2 and 3 is preferably made of copper, so as to be advantageous in improving the electrical conductivity thereof.

As shown in fig. 2 and 3, the aforementioned arc striking portion 1112 is composed of a first folded portion 11121 and a second folded portion 11122 (indicated in fig. 3) which are integrally formed with each other and sequentially extend at the distal end of the swinging end of the first movable contact piece 111.

Referring to fig. 4 and 5, the arc preventing moving member 2 has an arc striking portion accommodating chamber 21 and has a sleeve-shaped structure formed at one side thereof for inserting the arc striking portion 1112 into the arc striking portion inserting opening 22 of the arc striking portion accommodating chamber 21, the arc striking portion accommodating chamber 21 is shaped and sized to accommodate the arc striking portion 1112, and the arc striking portion 1112 is inserted into the arc striking portion accommodating chamber 21 from the arc striking portion inserting opening 22. Specifically, the arc prevention moving member 2, which is fitted over the aforementioned arc striking portion 1112, can prevent the arc from moving on the arc striking portion 1112.

In fig. 6, the arc 200 is generated and then moves along the striking portion 1112 because the arc moving member is not provided.

In fig. 7, the arc root of the arc 200 is blocked from moving on the arc striking portion 1112 because the arc striking portion 1112 of the first movable contact 111 is covered with the arc preventing moving member 2.

The second movable contact 1121 closes later than the first movable contact 1111 closes with the stationary contact, and the second movable contact 1121 separates from the stationary contact before the first movable contact 1111 separates from the stationary contact. It is thereby ensured that the aforementioned second movable contact 1121 carries current with the aforementioned stationary contact when the contact system 1 is in the closed state. While the aforesaid contact system 1 is separated, an arc is generated on the aforesaid first moving contact 1111 and the aforesaid stationary arc contact.

As shown in fig. 2 and 3, the first movable contact 111 is further provided with an abutment cavity 1113, and the abutment cavity 1113 abuts against one end of a contact spring (not shown in the drawings), and the other end of the contact spring abuts against a contact support (not shown in the drawings). Further, the contact pressure is increased for the first movable contact 111.

The first movable contact piece 111 is also provided with a pin hole 1114, the second movable contact piece 112 is also provided with a pin hole 1114, the pin hole 1114 on the first movable contact piece 111 corresponds to the pin hole 1114 on the second movable contact piece 112 in position, and a pin shaft passes through the pin hole 1114 to rotatably arrange the first movable contact piece 111 and the second movable contact piece 112 on the contact support.

A flexible connection fixing portion 1115 is further disposed on the first movable contact 111, and the fixing portion 1115 is configured to be electrically connected to one end of a conductive flexible connection (not shown), and the other end of the conductive flexible connection is electrically connected to the outlet row of the movable contact 11.

In the present embodiment, the aforementioned arc-preventing moving member 2 is an insulating member, and the insulating member is made of a plastic member.

Example 2

Referring to fig. 8 and 9, a first movable contact 1111 is fixed to a side of the first movable contact 111 facing downward from the swing end of the first movable contact 111 facing the grid 3 of the array, and the arc preventing moving member 2 is fixed to both a swing end face of the swing end and a swing end side of the opposite side to the first movable contact 1111; the arc-preventing moving member 2 is formed in a reverse-L-shaped structure by a swing end face fixing plate 23 and a swing end side face fixing plate 24, the swing end face fixing plate 23 is fixed to the swing end face of the swing end, and the swing end side face fixing plate 24 is fixed to the swing end side face.

As can be seen from the schematic diagrams of fig. 8 and 9, the arc striking portion 1112 is the top of the swinging end of the first movable contact 111. And does not extend to a side away from the aforementioned first movable contact 1111.

The arc-preventing moving member 2 is shaped like a L-shaped folded plate.

In this embodiment, the arc prevention moving member 2 can also block the movement of the arc root of the arc 200 on the striking portion 1112, and the effect is the same as that of the first embodiment. The remainder is the same as described for example 1.

Example 3

Referring to fig. 10 and 11, a first movable contact 1111 is fixed to a side of the first movable contact 111 facing downward from the swing end of the array of the grid plates 3, and the arc preventing member 2 has a hood-like structure having a triangular cavity 25 and a cavity opening 26 formed at one side of the triangular cavity 25 and is simultaneously hood-fitted to an upper portion of a swing end face of the swing end and an upper portion of a swing end side face of the opposite side to the first movable contact 1111. The remainder is the same as described for example 1.

Example 4

Referring to fig. 12, a first movable contact 1111 is fixed to a side of the movable contact 111 facing downward from the swing end of the one end of the array of grid plates 3, the arc preventing member 2 is configured as a sheet, and is fixed to a swing end side surface of the opposite side to the first movable contact 1111, and the arc preventing member 2 protrudes from the swing end surface.

Example 5

Referring to fig. 13, a first movable contact 1111 is fixed to a side of the first movable contact 111 facing downward from the swing end of the one end of the grid 3 of the array, and the arc preventing member 2 is configured as a block and is fixed to a swing end side of the opposite side to the first movable contact 1111 and is flush with a swing end face of the swing end.

In embodiment 5, the arc preventing member 2 prevents the arc root of the arc 200 from being transferred to a side surface of the first movable contact 111, which is far from the first movable contact 1111, after passing the top surface of the swinging end of the first movable contact 111.

Example 6

Referring to fig. 14, a first movable contact 1111 is fixed to a side of the movable contact 111 facing downward from the swinging end of the grid 3 of the array, and the arc preventing member 2 is configured as a sheet and is fixed to a top surface of the swinging end of the first movable contact 111.

Example 7

Referring to fig. 15, 16 and 17, the arc prevention moving member 2 includes a lower portion 27, a side portion 28 and a top portion 29. The lower portion 27 is located below the first movable contact 1111 of the first movable contact 111 to prevent the arc from being retracted. The side portions 28 are located at two sides of the first movable contact 111. The top 29 is sleeved on the arc striking portion 1112 of the first movable contact 111.

The lower portion 27, side portions 28 and top portion 29 are integrally formed.

In summary, in the above embodiments 1 to 5, the arc prevention member 2 is provided on the top surface of the rotating end of the first movable contact 111 and/or the side surface of the first movable contact 1111 away from the first movable contact 1111, and the arc prevention member 2 restricts the movement of the arc root of the arc 200.

Claims (11)

1. The utility model provides an improved circuit breaker contact arc extinguishing system, includes contact system (1) and explosion chamber, contact system (1) include moving contact (11) and stationary contact (12) to moving contact (11) are located moving contact (11) open direction's one side, explosion chamber includes grid (3) of array, is equipped with moving striking piece (4) in the one end of corresponding moving contact (11) of grid (3) of array, first moving contact (111) orientation the one end of grid (3) constitutes into the swing end, its characterized in that: an arc-preventing moving member (2) for preventing an arc root of the arc (200) from moving in the direction of the movable striking plate (4) on the swinging end is arranged on the swinging end.

2. An improved circuit breaker contact quenching system as claimed in claim 1 wherein: the arc extinguishing chamber further comprises a static arc striking piece (5), the dynamic arc striking piece (4) and the static arc striking piece (5) are respectively positioned at two ends of the grid piece (3) of the array, and the lower parts of the dynamic arc striking piece (4) and the static arc striking piece (5) extend towards the direction of the contact system (1) in a state of being close to each other in a mutually opposite way to form a horn mouth shape which is gradually narrowed from top to bottom.

3. An improved circuit breaker contact quenching system as claimed in claim 1 wherein: a first movable contact (1111) is fixed on the downward side of the swing end of the first movable contact (111) facing one end of the grid plates (3) of the array, an arc striking part (1112) is formed on the swing end, and the arc striking part (1112) extends towards the direction away from the first movable contact (1111); the arc-preventing moving part (2) is sleeved on the arc striking part (1112).

4. An improved circuit breaker contact quenching system as claimed in claim 3 wherein: the arc-preventing moving member (2) is of a sleeve-shaped structure which is provided with an arc striking part accommodating cavity (21) and is provided with an arc striking part inserting opening (22) for inserting the arc striking part (1112) into the arc striking part accommodating cavity (21) at one side, the shape and the size of the arc striking part accommodating cavity (21) are matched with those of the arc striking part (1112), and the arc striking part (1112) is inserted into the arc striking part accommodating cavity (21) from the arc striking part inserting opening (22).

5. An improved circuit breaker contact quenching system as claimed in claim 3 wherein: the movable contact (11) further comprises a second movable contact (112), the first movable contact (111) and the second movable contact (112) are arranged side by side, the second movable contact (112) is distributed on two sides of the first movable contact (111), the length of the first movable contact (111) is larger than that of the second movable contact (112), the second movable contact (112) is provided with a second movable contact (1121), and the first movable contact (1111) is located above the second movable contact (1121); the grid plates (3) comprise long grid plates and short grid plates, the long grid plates are multiple and are arrayed together, the short grid plates are in two rows, and the short grid plates are respectively positioned at two ends of the long grid plates in the array direction.

6. An improved circuit breaker contact quenching system as claimed in claim 1 wherein: a first movable contact (1111) is fixed on the side of the first movable contact (111) facing downwards towards the swinging end of one end of the grid plates (3) of the array, and the arc-preventing moving piece (2) is fixed on the swinging end face of the swinging end and the swinging end side face of the opposite side of the first movable contact (1111) at the same time.

7. The improved circuit breaker contact quenching system of claim 6, wherein: the arc-preventing moving member (2) is formed by a swing end face fixing plate (23) and a swing end side face fixing plate (24) in a L-shaped structure, the swing end face fixing plate (23) is fixed with the swing end face of the swing end, and the swing end side face fixing plate (24) is fixed with the swing end side face.

8. An improved circuit breaker contact quenching system as claimed in claim 1 wherein: a first movable contact (1111) is fixed on the side of the first movable contact (111) facing downwards towards the swinging end of one end of the grid plates (3) of the array, the arc-preventing moving part (2) is of a cover-shaped structure with a triangular inner cavity (25) and an inner cavity opening (26) formed on one side of the triangular inner cavity (25), and is simultaneously matched with the upper part of the swinging end face of the swinging end and the upper part of the swinging end side face of the opposite side of the first movable contact (1111).

9. An improved circuit breaker contact quenching system as claimed in claim 1 wherein: the arc-preventing moving part (2) comprises a lower part (27), side parts (28) and a top part (29), wherein the lower part (27) is positioned below a first movable contact point (1111) of the first movable contact piece (111), the side parts (28) are positioned on two sides of the first movable contact piece (111), and the top part (29) is sleeved on an arc striking part (1112) of the first movable contact piece (111).

10. An improved circuit breaker contact quenching system as claimed in claim 9 wherein: the lower part (27), the side part (28) and the top part (29) are integrally formed.

11. An improved circuit breaker contact quenching system as claimed in claim 1 wherein: the arc-preventing moving part (2) is an insulating part.