WO2017071449A1

WO2017071449A1 - Circuit-breaker and baffle thereof

Info

Publication number: WO2017071449A1
Application number: PCT/CN2016/100722
Authority: WO
Inventors: 葛伟骏; 张慎虎; 周长青
Original assignee: 上海电科电器科技有限公司; 浙江正泰电器股份有限公司
Priority date: 2015-10-30
Filing date: 2016-09-29
Publication date: 2017-05-04
Also published as: BR112018008400A2; EP3370246A4; BR112018008400B1; EP3370246B1; RU2700790C1; CN105185671B; CN105185671A; KR20180099634A; EP3370246A1

Abstract

Disclosed are a circuit-breaker and a baffle (101) thereof. Baffles are provided at two sides of a shell (103) of a circuit-breaker, wherein a baffle at one side is located inside an arc angle (102) of a static contact, and the baffle cuts off a space inside the arc angle of the static contact, and the baffles at the two sides have a symmetrical structure. The baffles can solve the problem that high-temperature gas returns from a side face of an arc angle of a static contact to a place between a moving contact and the static contact during a short circuit breaking process, thereby driving a voltaic arc to repeatedly move between running arcs, and causing excessively long breaking time and serious burn damage to an end tab and a moving/static contact; and the baffles can effectively cut off an airflow and a voltaic arc, so that the voltaic arc can better enter an arc extinguish chamber to extinguish an arc, the breaking time is shortened, and the breaking effect is good.

Description

Circuit breaker and its baffle

Technical field

This invention relates to the field of low voltage electrical and, more particularly, to a baffle for interrupting an electric arc and air flow in a circuit breaker.

Background technique

With the development of technology, the size of circuit breaker products is getting smaller and smaller, but the technical performance indicators are getting higher and higher. Because the volume of the circuit breaker is reduced, the high-temperature expansion gas generated by the arc during the short-circuit breaking process will interfere with the arc in a limited space, and the high-temperature expansion gas will hinder the arc from effectively entering the arc extinguishing chamber to extinguish the arc, resulting in arcing. Staying outside the arc extinguishing time becomes longer. If the arc stagnate outside the arc extinguishing chamber, for example, staying in the arc for a long time will cause the score to break for a long time, the performance index will decrease, and the arc that stays for a long time will cause the arc runner and the moving/static contact to burn seriously.

The experimental results show that the high temperature expansion gas will cause the arc to recirculate, so that the current stays outside the arc extinguishing chamber and cannot enter the arc extinguishing chamber. The arc reflow phenomenon mainly occurs in the arc angle area of the static contact, and the arc reflow phenomenon in this area is particularly serious. Most of the existing circuit breakers do not deal with the phenomenon of arc reflow in the arc angle region of the stationary contact, and thus the aforementioned problems exist.

Chinese patent application CN103123872A discloses a mounting switch device with an anterior chamber and a guiding rib, comprising a casing, a contact assembly in the front chamber, an arc extinguishing chamber, first and second arc guides. The contact assembly includes a fixed contact and a movable contact. The first and second arc guides direct the arc generated at the contact assembly when turned on into the arc chute. The first arc guide is associated with a fixed contact, wherein the front chamber has a plurality of projecting guide ribs on at least one of the inner faces of the cover, extending from the region of the contact assembly approximately in the direction of travel of the arc Arranged in the area of the arc extinguishing chamber. The at least one sub-face of the inner side of the housing has a projecting web with an annularly closed peripheral contour in the region of the fastening contact, which is arranged adjacent to the guide rib of the fastening contact and the first arc guide. Between the guide ribs adjacent to the fixed contact and the first arc guide can be configured to circulate a gas flowing around the tab. CN103123872A discloses the broken The road device considers the phenomenon of arc reflow in the arc angle area of the static contact, and designs the recirculation structure of the static contact and the arc angle region. The circuit breaker of CN103123872A guides the airflow in the arc angle region, can reduce the airflow backflow in the arc angle region, and reduces the obstruction of the airflow in the arc angle region to the arc entering the arc extinguishing chamber. However, outside the arc angle area, the airflow near the arc angle area, especially above the arc angle area, also has a significant effect on the arc. CN103123872A does not perform any treatment on the airflow outside the arc angle area, so the arc receives this area. The effect of the airflow will remain for a longer period of time.

Summary of the invention

The present invention is directed to a baffle for a circuit breaker and a circuit breaker having the baffle that interrupts airflow in and around the arc angle of the stationary contact.

According to an embodiment of the invention, a baffle of a circuit breaker is provided, which is disposed on two sides of a casing of a circuit breaker, wherein a baffle on one side is located in an arc angle of the static contact, and the baffle will be in static contact The space within the arc angle of the head is truncated, and the baffles on both sides have a symmetrical structure.

In one embodiment, the first baffle is located on one side of the stationary contact of the housing, the first baffle is located within an arc angle of the stationary contact, the first baffle intercepts the arc and/or airflow, and is located in another of the housing The second baffle on the side intercepts the arc and/or airflow.

In one embodiment, at least one of the first baffle and the second baffle is a right-angled baffle, and the straight-angle baffle penetrates the arc angle of the static contact to space the arc of the static contact Truncated.

In one embodiment, at least one of the first baffle and the second baffle is an arcuate baffle that occupies an arc angle of the stationary contact to intercept a space within the arc angle of the stationary contact.

According to an embodiment of the invention, a circuit breaker is provided. The two sides of the casing of the circuit breaker are provided with a baffle, wherein one baffle is located in an arc angle of the static contact, and the baffle will arc of the static contact The space inside the corner is cut off, and the baffles on both sides have a symmetrical structure.

In one embodiment, at least one of the first baffle and the second baffle is a right-angled baffle. The straight-angled baffle penetrates the arc angle of the stationary contact to cut off the space within the arc angle of the stationary contact.

The baffle plate of the invention can solve the problem that the high-temperature gas returns from the side of the arc angle of the static contact to the moving and static contacts during the short-circuit breaking process, thereby causing the arc to repeatedly move between the running arcs, resulting in a long breaking time and an arc striking plate. And the dynamic / static contact burned severely. The baffle can effectively cut off the airflow and the arc, so that the arc can enter the arc extinguishing chamber to extinguish the arc better, the breaking time is obviously shortened, and the breaking effect is better.

DRAWINGS

The above and other features, aspects, and advantages of the present invention will become more apparent from the description of the appended claims appended claims

1 discloses a structural view of a baffle of a circuit breaker in accordance with an embodiment of the present invention.

2 discloses a structural view of a baffle of a circuit breaker in accordance with another embodiment of the present invention.

3a and 3b illustrate structural views of a circuit breaker in accordance with an embodiment of the present invention.

4a and 4b disclose structural views of a circuit breaker in accordance with another embodiment of the present invention.

Figures 5a and 5b illustrate a block diagram of a circuit breaker in accordance with yet another embodiment of the present invention.

detailed description

In order to effectively reduce the obstruction of the arc entering the arc extinguishing chamber by the high temperature expanding gas generated by the arc during the short circuit breaking process, it is necessary to optimize the structure of the arc angle position of the static contact, not only the airflow in the arc angle region needs to be considered. The effect also needs to consider the influence of the airflow outside the arc angle zone. The invention provides a baffle in the arc angle region of the static contact, and the baffle cuts the space in the arc angle region. At the same time, the present invention provides a baffle having a symmetrical structure at a position corresponding to the arc angle region on the other side of the casing, so that the airflow in the arc angle region and the arc angle region can be cut off, thereby reducing the arc reflow phenomenon in the arc angle region. . This allows the arc to enter the arc extinguishing chamber more effectively and extinguish the arc.

The baffles of the circuit breaker are disposed on both sides of the casing of the circuit breaker, wherein one of the baffles is located within an arc angle of the stationary contact, and the baffle intercepts the space within the arc angle of the stationary contact. The baffle can take a variety of forms, the primary function of which is to cut off the space within the arc angle. The baffle on the other side has a symmetrical structure. A symmetrical structure here means that the baffles on the other side are placed in a symmetrical position, that is, at a corresponding position on the other side of the casing, and have corresponding dimensions. Alternatively, it can be understood that if there is also a static contact on the other side of the housing, the other side flap is located in the arc angle region of the virtual stationary contact and cuts off the space in the arc angle region. It should be noted that “symmetry” here refers to the installation position and size of the baffle, and the shape of the baffle is not required to be completely identical, which will be described in detail below.

1 discloses a structural view of a baffle of a circuit breaker in accordance with an embodiment of the present invention. In the embodiment shown in FIG. 1, the baffle 101 formed on the casing 103 is a right-angled baffle 111. The straight-angled baffle 111 penetrates the arc angle 102 of the stationary contact to intercept the space within the arc angle 102 of the stationary contact. In the illustrated embodiment, the right-angled baffle 111 extends longitudinally through the arc angle 102, dividing the space within the arc angle 102 into two portions that are not in communication.

2 discloses a structural view of a baffle of a circuit breaker in accordance with another embodiment of the present invention. In the embodiment shown in FIG. 2, the baffle 101 formed on the housing 103 is a curved baffle 112. The curved baffle 112 occupies the arc angle 102 of the stationary contact to intercept the space within the arc angle 102 of the stationary contact. In the illustrated embodiment, the curved baffle 112 has a shape that matches the arc angle 102, and the curved baffle 112 occupies a space within the arc angle 102.

In addition to the shape of the baffles shown in Figures 1 and 2, baffles of other shapes may be employed, the baffles functioning to intercept the space within the arc angle.

Each of the two sides of the housing of the circuit breaker has a baffle: a first baffle and a second baffle. The first baffle is located on a side of the housing facing the stationary contact, and the first baffle is located in an arc angle region of the stationary contact. The second baffle is located on the other side of the housing, and the second baffle has a structure that is symmetrical with the first baffle. That is, assuming that there is also a symmetrical static contact on the other side of the housing, the second side fence is located just in the arc angle region of the virtual stationary contact and cuts the space in the arc angle region. Both the first baffle and the second baffle function to interrupt arcing and/or airflow.

The invention also proposes a circuit breaker having the above described baffle. A baffle is disposed on both sides of the casing of the circuit breaker, wherein one side of the baffle is located in an arc angle of the static contact, the baffle intercepts a space in an arc angle of the static contact, and the baffles on both sides have Symmetrical structure. The first baffle is located on one side of the stationary contact of the housing, the first baffle is located within an arc angle of the stationary contact, and the second baffle is located on the other side of the housing. Both the first baffle and the second baffle function to interrupt arcing and/or airflow. The baffle may be in the form of a right-angled baffle as shown in Fig. 1, or may be a curved baffle as shown in Fig. 2, or other forms of baffles capable of intercepting the space in the arcuate area may be used.

3a and 3b illustrate structural views of a circuit breaker in accordance with an embodiment of the present invention. In the illustrated embodiment, the first baffle and the second baffle on both sides of the housing of the circuit breaker are identical in shape and are also symmetrical in position. The first baffle and the second baffle are both straight ribbed baffles. As shown in FIG. 3a, the first baffle 301 on the side of the housing facing the stationary contact is a right-angled baffle, and the first baffle 301 intercepts the arc and/or airflow. The arrows in Figure 3a show the arc and/or airflow path. As shown in FIG. 3b, the second baffle 302 on the other side of the housing is also a straight-angled baffle, the second baffle 302 is positioned symmetrically with the first baffle 301, and the second baffle 302 intercepts the arc and / or airflow. The arrows in Figure 3b show the arc and/or airflow path.

4a and 4b disclose structural views of a circuit breaker in accordance with another embodiment of the present invention. In the illustrated embodiment, the first baffle and the second baffle on both sides of the housing of the circuit breaker are identical in shape and are also symmetrical in position. The first baffle and the second baffle are both curved baffles. As shown in Figure 4a, the first baffle 401 on the side of the housing facing the stationary contact is a curved baffle, and the first baffle 401 intercepts the arc and/or airflow. The arrows in Figure 4a show the arc and/or airflow path. As shown in FIG. 4b, the second baffle 402 on the other side of the housing is also a curved baffle, the second baffle 402 is positioned symmetrically with the first baffle 401, and the second baffle 402 intercepts the arc and/or Or airflow. The arrows in Figure 4b show the arc and/or airflow path.

The shape of the baffles on either side of the housing may also vary. Figures 5a and 5b illustrate a block diagram of a circuit breaker in accordance with yet another embodiment of the present invention. In the illustrated embodiment, the first baffle and the second baffle on both sides of the housing of the circuit breaker are different in shape but symmetrical in position and corresponding in size. As shown in FIG. 5a, the first baffle 501 on the side of the housing facing the stationary contact is a right-angled baffle. The straight ribbed first baffle 501 intercepts the arc and/or airflow. The arrows in Figure 5a show the arc and/or airflow path. As shown in Figure 5b, the second baffle 502 on the other side of the housing is a curved baffle and the curved second baffle 502 intercepts the arc and/or airflow. The arrows in Figure 5b show the arc and/or airflow path. 5a and 5b better explain the meaning of "symmetric structure" of the present invention, and the symmetrical structure means that the second baffle on the other side is disposed at a position symmetrical with the first baffle, that is, on the casing. The other side corresponds to the position and has a corresponding size. Or it can be understood that if there is also a static contact on the other side of the housing, then the second baffle on the other side is located in the arc angle area of the virtual stationary contact and the space in the arc angle area Truncated. "Symmetric" refers to the mounting position and size of the baffle, and the shape of the baffle is not required to be exactly the same.

The above embodiments are provided to those skilled in the art to implement or use the present invention, and those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept. The scope of the invention is not limited by the embodiments described above, but should be the maximum range of the inventive features as claimed.

Claims

A baffle for a circuit breaker, characterized in that it is disposed on two sides of a casing of the circuit breaker, wherein one of the baffles is located within an arc angle of the static contact, and the baffle is within an arc angle of the static contact The space is cut off and the baffles on both sides have a symmetrical structure.
The baffle of the circuit breaker according to claim 1, wherein the first baffle is located on a side of the stationary contact of the housing, the first baffle is located in an arc angle of the static contact, and the first baffle intercepts the arc And/or airflow, the second baffle on the other side of the housing intercepts the arc and/or airflow.
The baffle of the circuit breaker according to claim 2, wherein at least one of the first baffle and the second baffle is a right-angled baffle, and the straight-ribbed baffle runs through the fixed contact The arc angle cuts off the space within the arc angle of the stationary contact.
A baffle for a circuit breaker according to claim 2, wherein at least one of said first baffle and said second baffle is a curved baffle, and said arcuate baffle occupies an arc angle of the stationary contact The space within the arc angle of the stationary contact is cut off.
A circuit breaker characterized in that: two sides of a casing of the circuit breaker are provided with a baffle, wherein one baffle is located in an arc angle of the static contact, and the baffle is within an arc angle of the static contact The space is cut off, and the baffles on both sides have a symmetrical structure.
The circuit breaker according to claim 5, wherein the first baffle is located on one side of the stationary contact of the housing, the first baffle is located in an arc angle of the stationary contact, and the first baffle intercepts the arc and/or The air flow, the second baffle on the other side of the housing, intercepts the arc and/or airflow.
The circuit breaker of claim 6 wherein said first and second stops At least one of the plates is a right-angled baffle, and the straight-ribbed baffle penetrates the arc angle of the stationary contact to cut the space within the arc angle of the stationary contact.
The circuit breaker according to claim 6, wherein at least one of said first baffle and said second baffle is a curved baffle, and said arcuate baffle occupies an arc angle of the stationary contact and is to be static The space within the arc angle of the contact is truncated.