CN215869259U - Arc extinguishing assembly, arc extinguishing device and molded case circuit breaker - Google Patents

Abstract

The utility model relates to the technical field of plastic shell circuit breakers, in particular to an arc extinguishing assembly, an arc extinguishing device and a plastic shell circuit breaker. The arc extinguishing assembly comprises a first grid sheet group and a second grid sheet group, the first grid sheet group comprises a plurality of first grid sheets which are arranged, the second grid sheet group comprises a plurality of second grid sheets which are arranged, and the plurality of second grid sheets are sequentially arranged below the plurality of first grid sheets at intervals; along the striking direction of first bars piece, a plurality of first bars piece projections are within the rotation orbit of moving contact, along the striking direction of second bars piece, a plurality of second bars piece projections are outside the rotation orbit of moving contact, and a plurality of second bars piece is radial setting from the one side that is close to the moving contact to the one side of keeping away from the moving contact. The arc extinguishing device comprises the arc extinguishing assembly. The molded case circuit breaker comprises the arc extinguishing device. The utility model provides an arc extinguishing assembly, an arc extinguishing device and a molded case circuit breaker, and solves the technical problem that the arc extinguishing effect of the arc extinguishing assembly is poor in the prior art.

Description

Arc extinguishing assembly, arc extinguishing device and molded case circuit breaker

Technical Field

The utility model relates to the technical field of plastic shell circuit breakers, in particular to an arc extinguishing assembly, an arc extinguishing device and a plastic shell circuit breaker.

Background

Generally, a molded case circuit breaker is an electrical protection device installed between a power supply and a load unit to protect the load unit, such as a motor, a transformer, and a power transmission line, from abnormal currents, such as large currents caused by short circuits and ground faults, generated in circuits, such as power transmission, distribution lines, and private power transformation facilities.

Specifically, when a moving contact of the molded case circuit breaker is separated from a stationary contact, an abnormal current is broken, an arc is generated between the moving contact and the stationary contact and is ejected from an air outlet of an arc extinguishing chamber, and meanwhile, high-temperature and high-pressure gas is accompanied, and the arc extinguishing assembly for avoiding the above problem is generally installed on the molded case circuit breaker because the problem such as inter-phase breakdown and part ablation is easily caused by the outwardly ejected arc and the high-temperature and high-pressure gas.

The arc extinguishing assembly comprises a plurality of arc extinguishing grid pieces, is an important accessory of the molded case circuit breaker and is connected with the molded case circuit breaker body, so that the molded case circuit breaker is prevented from risks such as interphase breakdown. However, in the prior art, the arc extinguishing effect of the arc extinguishing assembly is poor, and a part of electric arc is still discharged to the outside along with the air flow, so that zero arcing cannot be realized.

Therefore, the present application provides a new arc extinguishing assembly, an arc extinguishing device and a molded case circuit breaker in view of the above problems.

SUMMERY OF THE UTILITY MODEL

The first objective of the present invention is to provide an arc extinguishing assembly to alleviate the technical problem of poor arc extinguishing effect of the arc extinguishing assembly in the prior art.

The second objective of the present invention is to provide an arc extinguishing apparatus, so as to further alleviate the technical problem of the prior art that the arc extinguishing assembly has a poor arc extinguishing effect.

The third objective of the present invention is to provide a molded case circuit breaker to further alleviate the technical problem of poor arc extinguishing effect of the arc extinguishing assembly in the prior art.

Based on the first object, the utility model provides an arc extinguishing assembly for a molded case circuit breaker, wherein the molded case circuit breaker comprises a fixed contact and a movable contact which can rotate relative to the fixed contact to be in contact with or separated from the fixed contact;

the arc extinguishing assembly comprises a first grid plate group and a second grid plate group, the first grid plate group comprises a plurality of first grid plates which are sequentially arranged, the second grid plate group comprises a plurality of second grid plates which are sequentially arranged at intervals, and the second grid plates are sequentially arranged below the first grid plates at intervals;

along the arc striking direction of the first grids, a plurality of first grids project in the rotating track of the movable contact; along the arc striking direction of the second grids, the plurality of second grids project outside the rotating track of the moving contact, and the plurality of second grids are radially arranged from one side close to the moving contact to one side far away from the moving contact.

Furthermore, the connecting lines of the end parts of the second grid plates on one side close to the movable contact are in a first curve, and/or the connecting lines of the end parts of the second grid plates on one side far away from the movable contact are in a second curve;

the extending directions of the first curve and the second curve correspond to the rotating track direction of the moving contact.

By adopting the technical scheme, the arc extinguishing assembly has the following beneficial effects:

it should be noted that the moving contact is in contact with or separated from the fixed contact, so as to realize the closing and opening of the circuit breaker, thereby controlling the on/off of the circuit breaker.

In addition, the rotating track of the moving contact is the rotating track of the free end of the moving contact, along the arc striking direction of the first grids, the plurality of first grids project inside the rotating track of the moving contact, and the plurality of second grids project outside the rotating track of the moving contact.

The arc extinguishing subassembly of this embodiment sets up the second grid group through the below at first grid group, and consequently in this embodiment, the arc extinguishing subassembly both includes the projection first grid group within the rotation orbit of moving contact and includes the projection second grid group outside the rotation orbit of moving contact again to increased the quantity of arc extinguishing grid piece, improved the arc extinguishing effect of arc extinguishing subassembly, alleviated the relatively poor technical problem of arc extinguishing effect of the arc extinguishing subassembly that exists among the prior art.

In addition, a plurality of second bars are radial setting from the one side of being close to the moving contact to the one side of keeping away from the moving contact, that is, from the direction of keeping away from moving contact one side near a moving contact side, the arc extinguishing space between the adjacent second bars is crescent, can guarantee effectively to cut apart and elongate electric arc when moving contact and static contact are disconnected, be favorable to electric arc to get into the arc extinguishing space between a plurality of second bars and extinguish, the relatively poor technical problem of arc extinguishing effect of the arc extinguishing subassembly that has further alleviated exists among the prior art.

Based on the second objective, the utility model provides an arc-extinguishing device, which comprises an arc-extinguishing chamber, an arc-striking component and the arc-extinguishing component;

the arc extinguish chamber comprises a first cavity and a second cavity which are communicated, the first grid sheet group is arranged in the first cavity, and the second grid sheet group is arranged in the second cavity;

the arc striking component comprises a first arc striking piece, one end of the first arc striking piece is connected with the fixed contact, and the other end of the first arc striking piece inclines downwards and extends into the second cavity and is located below the bottom of the second grid group.

Further, the first arc-striking component comprises a conductive part connected with the fixed contact, an arc-striking part extending to the lower part of the second grid sheet group, and a connecting part located between the conductive part and the arc-striking part.

Further, the conductive part and the connecting part are in smooth transition, and/or the connecting part and the arc striking part are in smooth transition.

Furthermore, the rotating track of the moving contact comprises a first end point position and a second end point position which are oppositely arranged, and the first end point position is located at the fixed contact;

the arc striking assembly further comprises a second arc striking piece fixed relative to the arc extinguishing assembly, one end of the second arc striking piece is close to the position of the second end point, and the other end of the second arc striking piece extends into the first cavity and is positioned above the top of the first grid group.

Furthermore, the arc extinguishing device also comprises an arc extinguishing cover and a bracket, wherein the bracket is fixed relative to the arc extinguishing cover;

the arc extinguishing chamber is arranged in the arc extinguishing chamber, and the first grid group and the second grid group are fixedly connected to the support.

By adopting the technical scheme, the arc extinguishing device has the following beneficial effects:

by arranging the arc extinguishing assembly in the arc extinguishing device, correspondingly, the arc extinguishing device has all the advantages of the arc extinguishing assembly, and the description is omitted.

Based on the third objective, the utility model provides a molded case circuit breaker, which comprises a housing, a static contact, a movable contact and the arc extinguishing device, wherein the static contact, the movable contact and the arc extinguishing chamber of the arc extinguishing device are all arranged in the housing;

the static contact is fixedly connected with the shell, the moving contact is pivoted with the shell, and the moving contact can rotate relative to the static contact to be contacted with or separated from the static contact;

the static contact is located at the junction of the first chamber and the second chamber.

Furthermore, the shell comprises a side wall, a top cover and a base, wherein the side wall is connected with the top cover in a surrounding manner, and the top cover and the base are respectively arranged at two ends of the side wall;

the molded case circuit breaker also comprises a side air outlet and a bottom air outlet which are both communicated with the arc extinguish chamber; the side air outlet is arranged on the side surface of the arc extinguish chamber, penetrates through the shell through a side exhaust channel and is communicated to the outside of the side wall; the bottom air outlet is arranged on the bottom surface of the arc extinguish chamber, penetrates through the shell through a bottom exhaust channel and is communicated to the outside of the base;

wherein the length of the bottom exhaust channel is greater than the length of the side exhaust channel.

Further, from the top cover to the base, the side wall comprises a controller layer, an accessory layer, a body layer, a mutual inductor layer and a plug-in layer which are sequentially connected;

the number of the side air outlets is two, namely a first air outlet communicated with the first chamber and a second air outlet communicated with the second chamber, the side exhaust channel comprises a first exhaust channel and a second exhaust channel, the first air outlet penetrates through the shell through the first exhaust channel, and the second air outlet penetrates through the shell through the second exhaust channel;

the accessory layer is provided with a first groove, the body layer is provided with a second groove, and the first groove and the second groove jointly form a first opening communicated with the first exhaust channel and the outside of the side wall; the body layer is provided with a third groove, the mutual inductor layer is provided with a fourth groove, and the third groove and the fourth groove jointly form a second opening communicated with the second exhaust channel and the outside of the side wall.

By adopting the technical scheme, the molded case circuit breaker has the following beneficial effects:

by providing the arc extinguishing device in the molded case circuit breaker, correspondingly, the molded case circuit breaker has all the advantages of the arc extinguishing device, and the description is omitted.

Drawings

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

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

fig. 2 is a sectional view of a molded case circuit breaker according to an embodiment of the present invention;

fig. 3 is one of enlarged partial structures of the molded case circuit breaker shown in fig. 2;

fig. 4 is a second enlarged view of the molded case circuit breaker shown in fig. 2;

fig. 5 is a schematic structural diagram of an arc extinguishing device according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of an arc extinguishing device according to an embodiment of the present invention.

Reference numerals:

11-a stationary contact; 12-a moving contact;

2-a first group of grid plates; 21-a first grid sheet;

3-a second group of grid plates; 31-a second grid;

4-an arc extinguishing chamber; 41-a first chamber; 42-a second chamber; 43-arc chute; 44-a scaffold;

5-a first arc striking member; 51-a conductive portion; 52-a connecting part; 53-arc run-on;

6-a second arc striking piece;

71-a side wall; 72-a top cover; 73-a base; 74-a controller layer; 75-an accessory layer; 76-a body layer; 77-transformer layer; 78-plug layer;

8-side air outlet; 81-first outlet port; 82-a second air outlet; 83-first opening; 84-a second opening;

9-bottom air outlet; 91-bottom exhaust channel.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

Referring to fig. 2 and 3, the present embodiment provides an arc extinguishing assembly for a molded case circuit breaker, where the molded case circuit breaker includes a fixed contact 11 and a movable contact 12 capable of rotating relative to the fixed contact 11 to contact with or separate from the fixed contact 11.

Referring to fig. 6, the arc extinguishing assembly includes a first grid set 2 and a second grid set 3, the first grid set 2 includes a plurality of first grid pieces 21 arranged in sequence, the plurality of first grid pieces 21 may be parallel or non-parallel, and are not limited herein, the second grid set 3 includes a plurality of second grid pieces 31 arranged in sequence at intervals, and the plurality of second grid pieces 31 are arranged below the plurality of first grid pieces 21 in sequence at intervals.

Along the arc striking direction of the first grids 21, the plurality of first grids 21 are projected in the rotating track of the movable contact 12; along the arc striking direction of the second grid 31, the plurality of second grids 31 project outside the rotating track of the movable contact 12, and the plurality of second grids 31 are radially arranged from the side close to the movable contact 12 to the side far away from the movable contact 12.

It should be noted that the moving contact 12 is in contact with or separated from the fixed contact 11 to achieve the closing and opening of the circuit breaker, thereby controlling the on/off of the circuit breaker.

In addition, the rotation track of the movable contact 12 is the rotation track of the free end of the movable contact 12, and along the arc striking direction of the first grid 21, the plurality of first grids 21 are projected inside the rotation track of the movable contact 12, and the plurality of second grids 31 are projected outside the rotation track of the movable contact 12.

Moreover, the arc striking direction of the first grid 21 is a direction in which an arc between the movable contact and the fixed contact 11 is attracted by the first grid 21, that is, an extending direction of the first grid 21 from a side close to the movable contact 12 to a side far away from the movable contact 12; the arc striking direction of the second grid 31 is a direction in which an arc between the movable contact and the fixed contact 11 is attracted by the second grid 31, that is, an extending direction of the second grid 31 from a side close to the movable contact 12 to a side far from the movable contact 12.

Finally, the plurality of first grids 21 are sequentially arranged, the plurality of second grids 31 are sequentially arranged at intervals, and the plurality of second grids 31 are sequentially arranged below the plurality of first grids 21 at intervals, so that the plurality of first grids 21 and the plurality of second grids 31 are sequentially arranged at intervals from top to bottom.

The arc extinguishing subassembly of this embodiment sets up second grid group 3 through the below at first grid group 2, and consequently in this embodiment, the arc extinguishing subassembly both includes projection first grid group 2 within the rotation orbit of moving contact 12 and includes projection second grid group 3 outside the rotation orbit of moving contact 12 again to increased the quantity of arc extinguishing grid piece, improved the arc extinguishing effect of arc extinguishing subassembly, alleviated the relatively poor technical problem of arc extinguishing effect of the arc extinguishing subassembly that exists among the prior art.

In addition, a plurality of second bars 31 are radial setting from a side direction that is close to moving contact 12 to a side of keeping away from moving contact 12, that is, from a side direction that is close to moving contact 12 to a side of keeping away from moving contact 12, the arc extinguishing space between adjacent second bars 31 increases gradually, can guarantee effectively to cut apart and elongate electric arc when moving contact 12 divides absolutely with static contact 11, be favorable to electric arc to get into the arc extinguishing space between a plurality of second bars 31 and extinguish, the relatively poor technical problem of arc extinguishing effect of the arc extinguishing subassembly that has further alleviated exists among the prior art.

Optionally, a connecting line of end portions of a side of the plurality of second grids 31 close to the movable contact 12 is a first curve, or a connecting line of end portions of a side of the plurality of second grids 31 far from the movable contact 12 is a second curve.

Preferably, referring to fig. 3 and fig. 6, in this embodiment, a connecting line of end portions of a side of the second grid plates 31 close to the movable contact 12 is a first curve, and a connecting line of end portions of a side of the second grid plates 31 far from the movable contact 12 is a second curve.

The extending directions of the first curve and the second curve correspond to the rotating track direction of the movable contact 12.

It should be noted that, when the moving contact 12 is separated from the fixed contact 11 to generate an arc and a high-temperature and high-pressure airflow, a part of the airflow can move along with the moving contact 12, in this embodiment, the arc extinguishing assembly is a first curve formed by connecting the end portions of the plurality of second grid pieces 31 close to one side of the moving contact 12, and the end portion of the plurality of second grid pieces 31 far from one side of the moving contact 12 is a second curve, so as to facilitate the entry of the arc and the high-temperature and high-pressure airflow into the second grid piece group 3, thereby facilitating the arc extinguishing and facilitating the discharge of the high-temperature and high-pressure airflow.

Example two

The second embodiment provides an arc extinguishing device, the arc extinguishing device comprises the arc extinguishing assembly of the first embodiment, the technical features of the arc extinguishing assembly disclosed in the first embodiment are also applicable to the second embodiment, and the technical features of the arc extinguishing assembly disclosed in the first embodiment are not repeated. Embodiments of the arc extinguishing device are described in further detail below with reference to the drawings.

Referring to fig. 3 and 4 in combination with fig. 6, the arc extinguishing device provided in the present embodiment includes an arc extinguishing chamber 4, an arc striking assembly and the arc extinguishing assembly; the arc extinguish chamber 4 comprises a first chamber 41 and a second chamber 42 which are communicated, the first grid group 2 is arranged in the first chamber 41, and the second grid group 3 is arranged in the second chamber 42; the arc striking component comprises a first arc striking piece 5, one end of the first arc striking piece 5 is connected with the fixed contact 11, and the other end of the first arc striking piece 5 inclines downwards and extends into the second cavity 42 and is positioned below the bottom of the second grid sheet group 3.

In this embodiment, the first arc-striking component 5 is used for guiding the arc at the static contact 11 to the second chamber 42, and performing arc extinguishing treatment on the arc through the second grid group 3 in the second chamber 42. The first arc striking piece 5 is beneficial to enabling electric arcs to be rapidly transferred from the static contact 11, so that a large amount of electric arcs on the static contact 11 are prevented from being burned to a certain extent, and the electric arcs at the static contact 11 are rapidly transferred into the second chamber 42 for arc extinction, so that the service life of the circuit breaker is prolonged, and the arc extinction effect is improved; in addition, the first arc striking piece 5 is inclined and extended, so that the length of the first arc striking piece 5 is increased, the length of the electric arc at the static contact 11 is prolonged, the electric arc voltage is increased, and the breaking capacity of the electric arc is greatly improved.

Preferably, referring to fig. 4, in the present embodiment, the first arc-striking component 5 includes a conductive portion 51 connected to the fixed contact 11, an arc-striking portion 53 extending to the lower portion of the second grid set 3, and a connecting portion 52 located between the conductive portion 51 and the arc-striking portion 53.

With such an arrangement, when an arc is generated at the stationary contact 11, the arc is led to the second chamber 42 sequentially by the conductive portion 51, the connecting portion 52 and the arc striking portion 53, and then is extinguished by the second grid group 3 in the second chamber 42.

The first arc striking piece 5 has a three-section structure, so that the arc striking effect of the first arc striking piece 5 is improved, and the electric arc is further prevented from escaping.

Alternatively, the conductive portion 51 and the connecting portion 52 are smoothly transited, or the connecting portion 52 and the arc striking portion 53 are smoothly transited.

Preferably, with continued reference to fig. 4, in the present embodiment, the conductive portion 51 and the connecting portion 52 are smoothly transited, and the connecting portion 52 and the arc striking portion 53 are smoothly transited. Such an arrangement attenuates the local concentration of the electric field strength to some extent, making the electric field strength more uniform within the second chamber 42.

Preferably, referring to fig. 3 and fig. 6, in this embodiment, the rotation track of the movable contact 12 includes a first end point position and a second end point position which are oppositely arranged, and the first end point position is located at the fixed contact 11; the arc striking assembly further comprises a second arc striking member 6 fixed relative to the arc extinguishing assembly, one end of the second arc striking member 6 is close to the second end position, and the other end of the second arc striking member 6 extends into the first chamber 41 and is located above the top of the first grid group 2.

It should be noted that, the movable contact 12 rotates between the first end point position and the second end point position, when the movable contact 12 rotates to the first end point position, the movable contact 12 contacts with the fixed contact 11, the circuit breaker is closed, the movable contact 12 is separated from the fixed contact 11, and rotates to the second end point position, because one end of the second arc striking member 6 is close to the second end point position, and the other end extends into the first cavity 41 and is located above the top of the first grid group 2, the arc at the position of the movable contact 12 can be rapidly used for being led to the first cavity 41 by the second arc striking member 6, and the arc is extinguished by the first grid group 2 in the first cavity 41.

The second arc striking part 6 is beneficial to enabling the electric arc to be transferred from the movable contact 12 rapidly, so that the electric arc is prevented from being burnt on the movable contact 12 to a large extent, the electric arc at the position of the movable contact 12 is rapidly transferred into the first cavity 41 for arc extinction, the arc extinction efficiency and the arc extinction effect are improved, and the service life of the circuit breaker is prolonged.

Preferably, referring to fig. 5 and fig. 6, in the present embodiment, the arc extinguishing device further includes an arc extinguishing chamber 43 and a bracket 44, and the bracket 44 is fixed relative to the arc extinguishing chamber 43; the arc extinguishing chamber 4 is disposed in the arc extinguishing chamber 43, and the first grid set 2 and the second grid set 3 are both fixedly connected to the bracket 44, that is, the first grid pieces 21 and the second grid pieces 31 are both fixedly connected to the bracket 44.

Optionally, the bracket 44 is fixed relative to the arc chute 43, for example, the bracket 44 is fixed to the arc chute 43, or both the bracket 44 and the arc chute 43 are fixed to the housing of the circuit breaker.

Wherein, the arc extinguishing chamber 4 is arranged in the arc extinguishing chamber 43, and the first grid set 2 and the second grid set 3 are both fixedly connected to the bracket 44, so that the first grid set 2 and the second grid set 3 are both fixed relative to the arc extinguishing chamber 43 and stably located in the arc extinguishing chamber 4.

Preferably, the arc-extinguishing chamber 43 and the bracket 44 are both insulating members, and this arrangement prevents short-circuiting between the first grid plates 21, short-circuiting between the second grid plates 31, and short-circuiting between the first grid plate group 2 and the second grid plate group 3 to some extent.

The arc extinguishing device of the present embodiment has the advantages of the arc extinguishing assembly of the first embodiment, which have been described in detail in the first embodiment, and will not be repeated here.

EXAMPLE III

The third embodiment provides a molded case circuit breaker, the molded case circuit breaker includes the arc extinguishing device of the second embodiment, the technical features of the arc extinguishing device disclosed in the second embodiment are also applicable to the third embodiment, and the technical features of the arc extinguishing device disclosed in the second embodiment are not described repeatedly. Embodiments of the molded case circuit breaker are described in further detail below with reference to the accompanying drawings.

Referring to fig. 2, the molded case circuit breaker provided in this embodiment includes a housing, a fixed contact 11, a movable contact 12, and the arc extinguishing device, where the fixed contact 11, the movable contact 12, and the arc extinguishing chamber 4 of the arc extinguishing device are all disposed in the housing; the static contact 11 is fixedly connected with the shell, the moving contact 12 is pivoted with the shell, and the moving contact 12 can rotate relative to the static contact 11 to be contacted with or separated from the static contact 11; the stationary contact 11 is located at the intersection of the first chamber 41 and the second chamber 42.

The molded case circuit breaker further solves the technical problem of poor arc extinguishing effect of the circuit breaker in the prior art.

Preferably, referring to fig. 1 and fig. 2, in the present embodiment, the housing includes a side wall 71, and a top cover 72 and a base 73 respectively disposed at two ends of the side wall 71. The molded case circuit breaker further comprises a side air outlet 8 and a bottom air outlet 9 which are both communicated with the arc extinguish chamber 4; the side air outlet 8 is arranged on the side surface of the arc extinguish chamber 4, penetrates through the shell through a side exhaust channel and is communicated to the outside of the side wall 71; the bottom air outlet 9 is arranged on the bottom surface of the arc extinguish chamber 4, penetrates through the shell through a bottom exhaust channel 91 and is communicated to the outside of the base 73; wherein the length of the bottom exhaust channel 91 is greater than the length of the side exhaust channels.

That is, in the present embodiment, the sidewall 71 and the base 73 of the molded case circuit breaker are both provided with exhaust ports, wherein when the temperature and the pressure of the gas in the arc-extinguishing chamber 4 are increased due to the arc energy, the high-temperature and high-pressure gas flow can be exhausted sequentially through the side gas outlet 8 and the side exhaust channel, and can also be exhausted sequentially through the bottom gas outlet 9 and the bottom exhaust channel 91. Such setting has increased the area of gas vent on the one hand, and on the other hand, the gas vent that is located lateral wall 71 and base 73 respectively more is favorable to gaseous flow to accelerate the exhaust velocity of high temperature high pressure air current, made the circuit breaker cooling effect better.

In addition, the arrangement that the length of the side exhaust channel is relatively short enables electric arcs to enter the arc extinguish chamber 4 more quickly, and high-temperature and high-pressure gas is exhausted more quickly, so that voltage reduction and temperature reduction for the circuit breaker are facilitated; the relatively long setting of length of bottom exhaust passage 91, the time that electric arc and metal particle flow has been increased, the cooling effect to electric arc and metal particle has been strengthened, the effect of arc extinction and arc extinguishing can be improved, and then reach the mesh of eliminating electric arc fast, there is the atmospheric pressure difference between explosion chamber 4 and bottom exhaust passage 91, make the gaseous outwards injection of electric arc, the cooling and the heat dissipation of favourable electric arc, and the gaseous metal particle that carries of electric arc that sprays, impurity such as metal particle has been reduced in the circuit breaker, the medium recovery ability in the explosion chamber 4 has been improved.

Optionally, the side air outlet 8 is provided with one or more, preferably, the side air outlet 8 is provided with a plurality of; optionally, one or more bottom air outlets 9 are provided, and preferably, a plurality of bottom air outlets 9 are provided.

Preferably, with continued reference to fig. 1 and fig. 2, in the present embodiment, the side wall 71 includes a controller layer 74, an accessory layer 75, a body layer 76, a transformer layer 77, and a plug layer 78, which are sequentially connected from the top cover 72 to the base 73. The number of the side air outlets 8 is two, namely a first air outlet 81 communicated with the first chamber 41 and a second air outlet 82 communicated with the second chamber 42, the side air exhaust channel includes a first air exhaust channel and a second air exhaust channel, the first air outlet 81 penetrates through the housing through the first air exhaust channel, and the second air outlet 82 penetrates through the housing through the second air exhaust channel.

Wherein, the accessory layer 75 is provided with a first groove, the body layer 76 is provided with a second groove, and the first groove and the second groove together form a first opening 83 communicating the first exhaust channel with the outside of the side wall 71; the body layer 76 has a third slot, the transformer layer 77 has a fourth slot, and the third slot and the fourth slot together form a second opening 84 communicating the second exhaust channel with the outside of the sidewall 71. Due to the arrangement, the arc extinguishing efficiency is improved.

The controller layer 74 is used for placing a controller, wherein the controller layer 74 is provided with a controller window, and a transparent cover is arranged at the controller window to protect an operation panel of the controller; the accessory layer 75 is used for placing each accessory structure in the molded case circuit breaker, and comprises a circuit board fixing cavity, an alarm contact fixing area, a handle movable window, a magnetic flux release cavity and the like, wherein the circuit board is fixed in the circuit board fixing cavity through a screw, the alarm contact is fixed in the alarm contact fixing area through a screw, and the magnetic flux release is fixed in the magnetic flux release cavity through a buckle; a fixed contact fixing area, a movable contact fixing area, an operating mechanism fixing area, a partial arc extinguish chamber and a backup protection chamber are arranged in the body layer 76; a plurality of transformers are arranged in the transformer layer 77, wherein the transformers are fixed on the side wall 71 through screws; the plugging layer 78 is provided with a plurality of wiring terminals for being inserted into the power distribution cabinet to be electrically connected with the power distribution cabinet.

The molded case circuit breaker of the present embodiment has the advantages of the arc extinguishing device of the second embodiment, which have been described in detail in the first embodiment, and will not be repeated here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. An arc extinguishing assembly for a molded case circuit breaker, the molded case circuit breaker comprising a fixed contact (11) and a movable contact (12) capable of rotating relative to the fixed contact (11) to contact with or separate from the fixed contact (11);

the arc extinguishing assembly is characterized by comprising a first grid piece group (2) and a second grid piece group (3), wherein the first grid piece group (2) comprises a plurality of first grid pieces (21) which are sequentially arranged, the second grid piece group (3) comprises a plurality of second grid pieces (31) which are sequentially arranged at intervals, and the second grid pieces (31) are sequentially arranged below the first grid pieces (21) at intervals;

along the arc striking direction of the first grids (21), a plurality of first grids (21) are projected in the rotating track of the movable contact (12); along the arc striking direction of the second grids (31), the second grids (31) are projected outside the rotating track of the movable contact (12), and the second grids (31) are radially arranged from one side close to the movable contact (12) to one side far away from the movable contact (12).

2. An arc extinguishing assembly according to claim 1, characterized in that the connection line of the ends of the second grids (31) on the side close to the movable contact (12) is in a first curve, and/or the connection line of the ends of the second grids (31) on the side far from the movable contact (12) is in a second curve;

the extending directions of the first curve and the second curve correspond to the rotating track direction of the movable contact (12).

3. An arc-extinguishing device, characterized in that it comprises an arc-extinguishing chamber (4), an arc-striking assembly and an arc-extinguishing assembly according to claim 1 or 2;

the arc extinguish chamber (4) comprises a first chamber (41) and a second chamber (42) which are communicated with each other, the first grid group (2) is arranged in the first chamber (41), and the second grid group (3) is arranged in the second chamber (42);

the arc striking component comprises a first arc striking piece (5), one end of the first arc striking piece (5) is connected with the static contact (11), and the other end of the first arc striking piece inclines downwards and extends into the second cavity (42) and is located below the bottom of the second grid group (3).

4. An arc extinguishing device according to claim 3, characterized in that the first arc striking member (5) comprises a conductive part (51) connected with the stationary contact (11), an arc striking part (53) extending below the second group of grids (3), and a connecting part (52) between the conductive part (51) and the arc striking part (53).

5. An arc extinguishing device according to claim 4, characterized in that the conducting portion (51) is rounded to the connecting portion (52) and/or the connecting portion (52) is rounded to the run-on portion (53).

6. An arc-extinguishing device according to claim 3, characterized in that the rotation trajectory of the movable contact (12) comprises a first end point position and a second end point position which are oppositely arranged, and the first end point position is located at the fixed contact (11);

the arc striking assembly further comprises a second arc striking piece (6) fixed relative to the arc extinguishing assembly, one end of the second arc striking piece (6) is close to the position of the second end point, and the other end of the second arc striking piece extends into the first cavity (41) and is located above the top of the first grid group (2).

7. An arc extinguishing device according to claim 3, characterized in that the arc extinguishing device further comprises an arc chute (43) and a bracket (44), the bracket (44) being fixed relative to the arc chute (43);

arc extinguishing chamber (4) set up in arc extinguishing chamber (43), just first group of bars (2) with the equal rigid coupling of second group of bars (3) in support (44).

8. A molded case circuit breaker is characterized by comprising a shell, a fixed contact (11), a movable contact (12) and the arc-extinguishing device of any one of claims 3 to 7, wherein the fixed contact (11), the movable contact (12) and an arc-extinguishing chamber (4) of the arc-extinguishing device are all arranged in the shell;

the static contact (11) is fixedly connected with the shell, the moving contact (12) is pivoted with the shell, and the moving contact (12) can rotate relative to the static contact (11) to be contacted with or separated from the static contact (11);

the static contact (11) is positioned at the intersection of the first chamber (41) and the second chamber (42).

9. A molded case circuit breaker according to claim 8, wherein said case includes a side wall (71) and a top cover (72) and a base (73) respectively disposed at both ends of said side wall (71);

the molded case circuit breaker also comprises a side air outlet (8) and a bottom air outlet (9) which are both communicated with the arc extinguish chamber (4); the side air outlet (8) is arranged on the side surface of the arc extinguish chamber (4), penetrates through the shell through a side exhaust channel and is communicated to the outside of the side wall (71); the bottom air outlet (9) is arranged on the bottom surface of the arc extinguish chamber (4), penetrates through the shell through a bottom exhaust channel (91), and is communicated to the outside of the base (73);

wherein the length of the bottom exhaust channel (91) is greater than the length of the side exhaust channel.

10. A molded case circuit breaker according to claim 9, wherein said side wall (71) comprises a controller layer (74), an accessory layer (75), a body layer (76), a transformer layer (77) and a plug layer (78) connected in sequence from said top cover (72) to said base (73);

the number of the side air outlets (8) is two, namely a first air outlet (81) communicated with the first chamber (41) and a second air outlet (82) communicated with the second chamber (42), the side air exhaust channel comprises a first air exhaust channel and a second air exhaust channel, the first air outlet (81) penetrates through the shell through the first air exhaust channel, and the second air outlet (82) penetrates through the shell through the second air exhaust channel;

wherein the accessory layer (75) is provided with a first groove, the body layer (76) is provided with a second groove, and the first groove and the second groove jointly form a first opening (83) communicating the first exhaust channel with the outside of the side wall (71); the body layer (76) is provided with a third groove, the mutual inductor layer (77) is provided with a fourth groove, and the third groove and the fourth groove jointly form a second opening (84) communicated with the second exhaust channel and the outside of the side wall (71).

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