CN214012879U

CN214012879U - Plastic case circuit breaker

Info

Publication number: CN214012879U
Application number: CN202120252051.9U
Authority: CN
Inventors: 吴磊; 万和平; 张平
Original assignee: Gret Electric Co ltd
Current assignee: Gret Electric Co ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-08-20
Anticipated expiration: 2031-01-29

Abstract

A molded case circuit breaker. The problem that the existing electric arc cannot be discharged quickly is solved. It includes the casing, the casing on be equipped with and spout the arc mouth, the casing include upper cover and base, the upper cover lid arrange in on the base, the base on be equipped with arc control device, arc control device include arc extinguishing fence piece, arc extinguishing fence piece mutually support and form the arc extinguishing space, the top in arc extinguishing space be equipped with row arc chamber, the upper cover be equipped with and accelerate the arc in the arc extinguishing space to spout the arc guide plate of arc mouth motion. The beneficial effects of the utility model are that, set up the arc guide plate, restrain and flow on the steam for steam is outwards flowed through spouting the arc mouth with higher speed, thereby shortens electric arc spun time, reaches the purpose of putting out the arc as early as possible, reduces the sound contact scaling loss. The utility model discloses simple structure still has, convenient assembling, advantages such as long service life.

Description

Plastic case circuit breaker

Technical Field

The utility model relates to a low-voltage circuit breaker, concretely relates to moulded case circuit breaker.

Background

The molded case circuit breaker is also called a device type circuit breaker, all parts are sealed in a plastic shell, and an auxiliary contact, an undervoltage release, a shunt release and the like are modularized. Because the structure is very compact, the molded case circuit breaker can not be overhauled basically, manual operation is mostly adopted, and high-capacity electric opening and closing can be selected. The plastic shell circuit breaker is characterized in that a contact, an arc extinguish chamber, a release, an operating mechanism and the like are all arranged in a plastic shell, maintenance is generally not considered, the plastic shell circuit breaker is suitable for being used as a protection switch of a branch circuit, an overcurrent release has two types of thermomagnetic type and electronic type, the general thermomagnetic type plastic shell circuit breaker is a nonselective circuit breaker and only has two protection modes of overload long delay and short circuit instant, and the electronic type plastic shell circuit breaker has four protection functions of overload long delay, short circuit short delay, short circuit instant and grounding fault. The newly-released products of part of electronic molded case circuit breakers also have the function of regional selective interlocking. Most molded case circuit breakers are manually operated and also have a partially motorized operating mechanism.

The main contact of the molded case circuit breaker is manually operated or electrically switched. After the main contact is closed, the free tripping mechanism locks the main contact at the closing position. The coil of the over-current release and the thermal element of the thermal release are connected with the main circuit in series, and the coil of the under-voltage release is connected with the power supply in parallel. When the circuit is short-circuited or seriously overloaded, the armature of the overcurrent release is attracted, so that the free release mechanism acts, and the main contact breaks the main circuit; when the circuit is overloaded, the thermal element of the thermal release heats to bend the bimetallic strip, so as to push the free release mechanism to act, and the main contact breaks the main circuit; when the circuit is under-voltage, the armature of the under-voltage release releases, so that the free release mechanism also acts, and the main contact breaks the main circuit; when the shunt release button is pressed, the armature of the shunt release is attracted, so that the free release mechanism acts, and the main contact breaks the main circuit. The molded case circuit breaker further comprises an arc extinguishing system, and the arc extinguishing system is used for realizing the trend of continuously increasing the limiting current, namely the current limiting effect, and finally extinguishing the arc through the effect on the arc when the molded case circuit breaker is in breaking. Because the movable contact support and the static contact support have voltage, electric arcs are formed in the separation process, the electric arcs enter an arc extinguish chamber of an arc extinguish system under the effects of magnetic blow effect, gas power and the like, the electric arcs entering the arc extinguish chamber are divided into a plurality of short arcs connected in series by arc extinguish grid plates, namely metal grid plates, arranged in the arc extinguish chamber at equal intervals along the electric arc direction, and therefore the electric arcs are cooled rapidly, the voltage drop of the electric arcs is improved rapidly, and the purpose of arc extinction is achieved. When the arc is extinguished in the arc extinguishing chamber, heat can be generated, and if the heat can not be dissipated in time, subsequent arc extinguishing can be influenced. The electric arc of the existing molded case circuit breaker is discharged from the upper part of the arc extinguish chamber, and the space of the shell above the arc extinguish chamber is large due to the operating mechanism and the transmission mechanism, so that the air heated by the electric arc is squat between the upper parts in the shell, the electric arc can not be discharged quickly, and the subsequent arc extinguishing of a product is influenced.

SUMMERY OF THE UTILITY MODEL

For solving the problem that current electric arc can not be discharged fast among the background art, the utility model provides a moulded case circuit breaker.

The technical scheme of the utility model is that: the utility model provides a moulded case circuit breaker, includes the casing, the casing on be equipped with and spout the arc mouth, the casing include upper cover and base, the upper cover lid arrange in on the base, the base on be equipped with arc control device, arc control device include arc extinguishing fence piece, arc extinguishing fence piece mutually support and form the arc extinguishing space, the top in arc extinguishing space be equipped with row arc chamber, the upper cover be equipped with the arc guide plate of arc to spouting the arc mouth motion in accelerating the arc extinguishing space.

As an improvement of the utility model, the arc guide plate on locate to arrange the arc intracavity and will arrange the space separation of arc intracavity for first arc guide chamber and holding chamber, arc guide plate card go into the holding intracavity and be connected with the upper cover.

As a further improvement of the utility model, the arc guide plate on be equipped with the guide part, the guide part orientation spout the setting of arc mouth.

As a further improvement of the utility model, the guide part is a guide inclined plane or a guide curved surface.

As a further improvement of the utility model, the arc guiding plate on be equipped with the portion of bending, the portion of bending card go into the holding intracavity of upper cover and be connected with the upper cover.

As a further improvement of the utility model, the arc guide plate is integrally formed by gas production materials.

As a further improvement, the arc control device include the mounting panel, the arc extinguishing fence piece locate on the mounting panel, the mounting panel on be equipped with the arc mouth of leading of electric arc circulation with higher speed.

As a further improvement, the arc control device locate in the installation cavity of base, the inner wall of mounting panel and installation cavity form the second and lead the arc chamber, the arc extinguishing space lead the arc chamber, arrange the arc chamber and link to each other with spouting the arc mouth through leading arc mouth, second.

As a further improvement of the utility model, the spout the arc mouth have a plurality ofly just spout the arc mouth and be the strip setting, on cover adjacent two and spout and be equipped with the recess between the arc mouth.

As a further improvement, the arc control device have a plurality ofly, what every arc control device's top corresponds is provided with leads the arc board, lead the arc board and be split type structure with the upper cover.

The beneficial effects of the utility model are that, set up the arc guide plate, restrain and flow on the steam for steam is outwards flowed through spouting the arc mouth with higher speed, thereby shortens electric arc spun time, reaches the purpose of putting out the arc as early as possible, reduces the sound contact scaling loss. The utility model discloses simple structure still has, convenient assembling, advantages such as long service life.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is an explosion structure diagram of the embodiment of the present invention.

Fig. 3 is a schematic sectional structure diagram of an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of the arc extinguishing device 5 shown in fig. 2.

Fig. 5 is a schematic structural view of the arc guide plate 6 in fig. 2.

In the figure, 1, a housing; 2. Spraying an arc opening; 3. an upper cover; 31. a groove; 4. a base; 41. a mounting cavity; 5. an arc extinguishing device; 51. an arc extinguishing grid sheet; 52. an arc extinguishing space; 53. mounting a plate; 54. an arc guide opening; 6. an arc guide plate; 61. a guide portion; 62. a bending part; 7. arc discharge cavities; 71. a first arc guiding cavity; 72. an accommodating cavity; 8. a second arc guiding cavity.

Detailed Description

The embodiments of the present invention will be further explained with reference to the accompanying drawings:

shown by fig. 1 in combination with fig. 2-5, a molded case circuit breaker, includes casing 1, casing 1 on be equipped with spout arc mouth 2, casing 1 include upper cover 3 and base 4, upper cover 3 cover arrange in on the base 4, base 4 on be equipped with arc control device 5, arc control device 5 include arc extinguishing fence piece 51, arc extinguishing fence piece 51 mutually support and form arc extinguishing space 52, arc extinguishing space 52's top be equipped with row arc chamber 7, upper cover 3 on be equipped with and accelerate the arc in the arc extinguishing space 52 to spout arc guide plate 6 of arc mouth 2 motion. The beneficial effects of the utility model are that, set up the arc guide plate, restrain and flow on the steam for steam is outwards flowed through spouting the arc mouth with higher speed, thereby shortens electric arc spun time, reaches the purpose of putting out the arc as early as possible, reduces the sound contact scaling loss. The utility model discloses simple structure still has, convenient assembling, advantages such as long service life.

The arc guide plate 6 is arranged in the arc discharge cavity 7 and divides the space in the arc discharge cavity 7 into a first arc guide cavity 71 and a containing cavity 72, and the arc guide plate 6 is clamped in the containing cavity 72 and connected with the upper cover 3. The structure does not need to change the structure of the existing shell, so that the product has better general distribution performance, hot gas can be quickly discharged, the arc burning time is shortened, and the arc quenching is accelerated.

The arc guide plate 6 is provided with a guide part 61, and the guide part 61 is arranged towards the arc spraying opening 2. Specifically, the guide portion 61 is a guide slope or a guide curved surface. The structure is convenient for exhaust, can inhibit the influence of the upward flow of hot gas on exhaust, ensures that the hot gas flows outwards through the arc spraying port at an accelerated speed, shortens the time for discharging the electric arc and the hot gas, achieves the aim of quenching the electric arc as soon as possible, and reduces the burning loss of the moving contact and the static contact.

The arc guide plate 6 is provided with a bending part 62, and the bending part 62 is clamped into the accommodating cavity 72 of the upper cover to be connected with the upper cover 3. The structure is convenient for the installation and fixation of the arc guide plate, is convenient for the matching with the existing shell, and has wider adaptation range.

The arc guide plate 6 is integrally formed by adopting gas production materials. The arc guide plate is made of gas-generating material by pressing, can generate gas at high temperature, increases the pressure, blows the electric arc to the arc spraying opening and shortens the arc burning time.

The arc extinguishing device 5 comprises a mounting plate 53, the arc extinguishing gate sheet 51 is arranged on the mounting plate 53, and an arc guiding opening 54 for accelerating the circulation of electric arcs is arranged on the mounting plate 53. Specifically, the arc control device 5 is arranged in the mounting cavity 41 of the base 4, the mounting plate 53 and the inner wall of the mounting cavity 41 form a second arc guide cavity 8, and the arc extinguishing space 52 is connected with the arc spraying opening 2 through an arc guide opening 54, the second arc guide cavity 8 and the arc discharge cavity 7. The space in the shell can be reasonably utilized, and the arc guide port is arranged, so that electric arcs in the arc extinguishing space can be quickly sprayed out, the flowing of the electric arcs is accelerated, and the purposes of shortening the arc extinguishing time and reducing the burning loss of the moving and static contacts are achieved.

Spout the arc mouth 2 have a plurality ofly and spout the arc mouth 2 and be the strip setting, two adjacent spout and be equipped with recess 31 between the arc mouth 2 on the upper cover 3. The arrangement of the groove ensures that the product has high strength, saves materials and reduces cost, and the strip-shaped arc spraying opening has simple structure and strong heat extraction capability

The arc control device 5 have a plurality ofly, what every arc control device 5 top corresponds is provided with leads arc board 6, lead arc board 6 and upper cover 3 be split type structure. Split type arc guide plate simple structure, simple to operate, the current casing upper cover of adaptation, the production and processing of being convenient for, do the utility model discloses an optimal mode. Of course, in the actual production process, a plurality of arc extinguishing devices can also correspond to one arc guide plate.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, 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 is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The skilled person should understand that: although the present invention has been described in accordance with the above embodiments, the inventive concept is not limited to this embodiment, and any modification of the inventive concept will be included in the scope of the patent claims.

Claims

1. The molded case circuit breaker comprises a shell (1), wherein the shell (1) is provided with an arc spraying opening (2), and is characterized in that the shell (1) comprises an upper cover (3) and a base (4), the upper cover (3) is arranged on the base (4) in a covering mode, an arc extinguishing device (5) is arranged on the base (4), the arc extinguishing device (5) comprises arc extinguishing grid pieces (51), the arc extinguishing grid pieces (51) are matched with each other to form an arc extinguishing space (52), an arc discharge cavity (7) is arranged above the arc extinguishing space (52), and an arc guide plate (6) for accelerating the movement of an arc in the arc extinguishing space (52) to the arc spraying opening (2) is arranged on the upper cover (3).

2. The molded case circuit breaker according to claim 1, wherein the arc guide plate (6) is disposed in the arc discharge chamber (7) and divides a space in the arc discharge chamber (7) into a first arc guide chamber (71) and an accommodating chamber (72), and the arc guide plate (6) is clamped in the accommodating chamber (72) and connected to the upper cover (3).

3. A molded case circuit breaker according to claim 1, wherein said arc-guiding plate (6) is provided with a guide portion (61), said guide portion (61) being disposed toward said arc-ejecting opening (2).

4. A molded case circuit breaker according to claim 3, wherein said guide portion (61) is a guide slope or a guide curved surface.

5. The molded case circuit breaker according to claim 2, wherein the arc guide plate (6) is provided with a bent portion (62), and the bent portion (62) is inserted into the receiving cavity (72) of the upper cover and connected to the upper cover (3).

6. The molded case circuit breaker as claimed in claim 1, wherein the arc plate (6) is integrally formed of a gas generating material.

7. The molded case circuit breaker according to claim 1, wherein the arc extinguishing device (5) comprises a mounting plate (53), the arc extinguishing fence sheet (51) is disposed on the mounting plate (53), and the mounting plate (53) is provided with an arc guiding opening (54) for accelerating the circulation of the arc.

8. A molded case circuit breaker according to claim 7, characterized in that the arc extinguishing device (5) is disposed in the mounting cavity (41) of the base (4), the mounting plate (53) and the inner wall of the mounting cavity (41) form a second arc guiding cavity (8), and the arc extinguishing space (52) is connected to the arc spraying opening (2) through the arc guiding opening (54), the second arc guiding cavity (8) and the arc discharge cavity (7).

9. A molded case circuit breaker according to claim 1, wherein said arc spraying opening (2) is plural and said arc spraying opening (2) is arranged in a bar shape, and a groove (31) is provided between two adjacent arc spraying openings (2) on said upper cover (3).

10. A molded case circuit breaker according to claim 1, wherein there are a plurality of arc extinguishing devices (5), an arc guiding plate (6) is correspondingly disposed above each arc extinguishing device (5), and the arc guiding plate (6) and the upper cover (3) are of a split structure.