CN216120051U

CN216120051U - Breaking unit for efficient arc extinction

Info

Publication number: CN216120051U
Application number: CN202122270912.9U
Authority: CN
Inventors: 陈贤卓; 王志勇; 叶楠; 马成连; 王丽
Original assignee: Fato Mechanical And Electrical Co ltd
Current assignee: Fato Mechanical And Electrical Co ltd
Priority date: 2021-09-16
Filing date: 2021-09-16
Publication date: 2022-03-22
Anticipated expiration: 2031-09-16

Abstract

A breaking unit for efficiently extinguishing arc belongs to the technical field of circuit breakers, and comprises a shell, a static contact and a moving contact, wherein a first arc extinguish chamber and a second arc extinguish chamber are arranged in the shell, arc extinguishing grid groups are arranged in the first arc extinguish chamber and the second arc extinguish chamber, the static contact is in the shape of a hook, a magnetic conducting device is arranged in the hook of the static contact, a first arc isolating cover is arranged outside the hook, magnetic conducting plates are arranged at two ends of the magnetic conducting device in parallel, a second arc isolating cover is arranged at the lower end of the magnetic conducting plate, the static contact and the moving contact move in the middle of the parallel magnetic conducting plates, the moving direction of the static contact and the moving contact is perpendicular to the magnetic conducting plates, and arc conducting sheets are embedded in the inner wall of the shell and are parallel to the static contact; the arc extinguishing device is simple in structure, reasonable in layout and high in safety, the magnetic field generated between the parallel magnetic conducting plates by the magnetic conducting devices on the static contacts blows electric arcs into the arc extinguishing chamber, the arc extinguishing grid sheet set is used for voltage reduction and cooling, the arc conducting sheets are arranged, the electric arcs are accelerated to be led into the arc extinguishing grid sheet set, and the arc extinguishing efficiency is greatly improved.

Description

Breaking unit for efficient arc extinction

Technical Field

The utility model relates to the field of circuit breakers, in particular to a breaking unit for efficiently extinguishing arc.

Background

The molded case circuit breaker is one of important distribution appliances in a low-voltage power grid system, and when a large short-circuit current is encountered in a circuit, a cluster of electric arcs with extremely high temperature and strong light can be generated between a moving contact and a fixed contact of the molded case circuit breaker, so that the electric service life and the reliability of the molded case circuit breaker are influenced, and even the safe and reliable operation of the whole power distribution network can be endangered. The arc is generated between a moving contact and a fixed contact in the current product, arc extinguishing grid plates are generally adopted for arc extinguishing, the fault arc is divided into a plurality of sections of small arcs, the near-cathode effect of alternating current arc is utilized, the fault current is reduced by increasing the voltage of the arc to achieve the effect of arc extinguishing, the speed of the arc entering an arc extinguishing chamber in the traditional device is low, a magnetic blowing structure is generally adopted, the arc is blown into the arc extinguishing chamber through a magnetic field, and the existing magnetic blowing type structure is complex, unreasonable in layout, low in safety and low in arc guiding efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a breaking unit capable of efficiently extinguishing arc.

The technical scheme adopted by the utility model is as follows: the utility model provides a disconnected unit of high-efficient arc extinguishing, includes casing, static contact and moving contact, be equipped with first explosion chamber and second explosion chamber in the casing, all be equipped with arc extinguishing bars group in first explosion chamber and the second explosion chamber, the static contact is the crotch form, be equipped with magnetic conduction device and crotch and be equipped with first arc baffle outward in the crotch of static contact, magnetic conduction device both ends parallel arrangement magnetic conductive plate, the magnetic conductive plate lower extreme sets up the second arc baffle, the static contact is perpendicular with the magnetic conductive plate in the middle action of parallel magnetic conductive plate and direction of action, it is parallel with the static contact to inlay the arc guide piece on the shells inner wall.

The arc extinguishing grid group consists of a plurality of arc extinguishing grid pieces arranged in parallel and arc barriers arranged at two ends and used for fixing the arc extinguishing grid pieces.

The arc extinguishing chamber is provided with a gas outlet, and a flashover clapboard is arranged at the gas outlet.

The magnetic conduction device consists of a magnetic conduction coil and an iron core penetrating through the coil.

And a clamp spring used for being embedded into the shell to fix is arranged on the second arc isolating cover.

The fixed contacts are divided into long fixed contacts and short fixed contacts, the long fixed contacts are arranged in the first arc extinguish chamber, and the short fixed contacts are arranged in the second arc extinguish chamber.

Except that the static contact is different, the first explosion chamber is the same with the inside other structures of second explosion chamber.

And a rotary moving contact device is arranged between the first arc extinguish chamber and the second arc extinguish chamber.

The shell is divided into a left shell and a right shell, and the left shell is connected with the right shell through a rivet.

And the inner walls of the left shell and the right shell are symmetrically provided with clamping grooves for embedding the rotary moving contact device, the static contact and the arc extinguishing grid set.

The utility model has the following beneficial effects: the magnetic conduction plate is fixed at two ends of the action part of the moving contact and the static contact through the second arc isolation cover, compared with the prior art that the magnetic conduction plate covers the whole arc extinguish chamber, the space is saved, the arc isolation cover also plays a role in protection, meanwhile, the first arc isolation cover is arranged on the static contact to prevent electric arcs from being sprayed backwards to damage other components, then, a magnetic field is generated between the parallel magnetic conduction plates through the magnetic conduction device on the static contact to blow the electric arcs generated by the moving contact and the static contact into the arc extinguish chamber, and then, the voltage is reduced and the electric arcs are cooled through the arc extinguish grid sheet set.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a breaking unit of the present invention;

FIG. 2 is a schematic diagram of an arc chute set according to the present invention;

FIG. 3 is a schematic structural diagram of a magnetic conductive device according to the present invention;

fig. 4 is a schematic structural diagram of a rotary moving contact device according to the present invention;

FIG. 5 is a schematic view of a rotating shaft structure according to the present invention;

FIG. 6 is a schematic structural view of the shaped spring of the present invention;

fig. 7 is a schematic structural diagram of a movable contact according to the present invention;

fig. 8 is a schematic structural view of the application of the breaking unit of the present invention in a circuit breaker;

in the figure, 1-arc guiding sheet, 2-shell, 21-left shell, 22-right shell, 3-static contact, 31-long static contact, 32-short static contact, 4-magnetic conducting device, 41-magnetic conducting coil, 42-iron core, 5-magnetic conducting plate, 6-rotary moving contact device, 61-rotating shaft, 611-spring shaft cavity, 612-spring cavity, 613-connecting through hole, 614-cylindrical protrusion, 62-spring shaft, 63-moving contact, 631-second groove, 632-first groove, 633-end arm, 634-silver contact, 64-special spring, 641-tension spring, 642-special spring connecting part, 7-rivet, 8-second arc isolating cover, 81-clamp spring, 9-arc extinguishing chamber, 91-arc extinguishing grid group, 911-arc extinguishing grid sheet, 9111-pin, 9112-notch, 912-arc isolating plate, 92-first arc extinguishing chamber, 93-second arc extinguishing chamber, 10-first arc isolating cover, 11-air outlet, 12-arc extinguishing baffle, 13-base and 14-operating mechanism.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.

The terms of direction and position of the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer to the direction and position of the attached drawings. Accordingly, the use of directional and positional terms is intended to illustrate and understand the present invention and is not intended to limit the scope of the present invention.

As shown in fig. 1 to 3, in an embodiment of the present invention, a breaking unit for efficiently extinguishing an arc includes a housing 2, a fixed contact 3 and a movable contact 63, two arc extinguishing chambers 9 are disposed in the housing 2, which are a first arc extinguishing chamber 92 and a second arc extinguishing chamber 93, arc extinguishing grid sets 91 are disposed in the first arc extinguishing chamber 92 and the second arc extinguishing chamber 93, the fixed contact 3 is in a hook shape, a magnetic conductive device 4 is disposed in the hook of the fixed contact 3, a first arc shielding cover 10 is disposed outside the hook, magnetic conductive plates 5 are disposed at two ends of the magnetic conductive device 4 in parallel, a second arc shielding cover 8 is disposed at a lower end of the magnetic conductive plate 5, the fixed contact 3 and the movable contact 63 move in the middle of the parallel magnetic conductive plates 5, and the moving direction is perpendicular to the magnetic conductive plates 5, a magnetic conductive plate 1 is embedded on an inner wall of the housing 2 and is parallel to the fixed contact 3, the magnetic conductive plates 5 are fixed at two ends of the moving positions of the movable contact 63 and the fixed contact 3 by the second arc shielding cover 8, meanwhile, the first arc-isolating cover 10 is arranged on the static contact 3 to prevent electric arc spraying from damaging other components, then a magnetic field is generated between the parallel magnetic conducting plates 5 through the magnetic conducting device 4 on the static contact 3 to blow electric arcs generated by the moving contact 63 and the static contact 3 into the arc extinguish chamber, and then the voltage is reduced and cooled through the arc extinguish grid group 91, further, the arc-conducting plate 1 is further arranged to accelerate the electric arcs to be led into the arc extinguish grid group 91, and the arc extinguish efficiency is greatly improved.

The arc extinguishing grid group 91 consists of a plurality of arc extinguishing grid pieces 911 arranged in parallel and arc barriers 912 arranged at two ends and used for fixing the arc extinguishing grid pieces, a fault arc is divided into a plurality of small arcs, the voltage of the arc is increased by utilizing the near-cathode effect of the alternating current arc to reduce the fault current so as to achieve the arc extinguishing effect, and specifically, the arc extinguishing grid group 91 consists of seven arc extinguishing grid pieces 911 arranged in parallel and two arc barriers 912 arranged at two ends and used for fixing the arc extinguishing grid pieces; preferably, the arc-extinguishing grid 911 is a rectangle, two short sides of which are symmetrically provided with four pins 9111 to match with the grooves in the housing, and the center of the long side of one side of the arc-extinguishing grid is provided with a notch 9112, and further, the arc-extinguishing grid 911 can be designed into other shapes according to requirements.

The explosion chamber is equipped with gas outlet 11, gas outlet play is equipped with flashover baffle 12, cuts apart into the little electric arc of many sections with trouble electric arc, guarantees that the hot gas flow that produces can in time cool off and disperse when the arc extinguishing, and the gas outlet can blow the system cooperation with the magnetism of circuit breaker, strengthens magnetism greatly and blows the effect.

The magnetic conducting device is composed of a magnetic conducting coil 41 and an iron core 42 penetrating through the coil, and provides magnetic force.

The second arc-isolating cover 8 is provided with a clamp spring 81 which is used for being embedded into the shell to be fixed, the installation is convenient, and the part is an arc moving part which is not suitable for being connected by using screws.

The fixed contacts are divided into a long fixed contact 31 and a short fixed contact 32, which are both in a hook shape, the hook portion of the long fixed contact 31 is arranged in the first arc-extinguishing chamber 92, the tail portion of the hook portion extends out of the housing, and is externally provided with a through hole for electrical connection, the hook portion of the short fixed contact 32 is arranged in the second arc-extinguishing chamber 93, the tail portion of the hook portion extends out of the housing, and is externally provided with a through hole for electrical connection.

The first arc-extinguishing chamber 92 and the second arc-extinguishing chamber 93 have the same internal structure except for the stationary contact 3.

A rotary moving contact device 6 is arranged between the first arc-extinguishing chamber 92 and the second arc-extinguishing chamber 93.

The shell 2 is divided into a left shell 21 and a right shell 22, the left shell 21 and the right shell 22 are connected through rivets 7, and specifically, seven rivet connection structures are arranged, so that the structure is firm and reliable, and good air tightness is achieved.

The inner walls of the left shell 21 and the right shell 22 are symmetrically provided with clamping grooves for embedding the rotary moving contact device 6, the static contact 3 and the arc extinguishing grid group 91, so that the device is reasonable in internal layout and convenient to assemble.

As shown in fig. 4 to 7, the rotary movable contact device 6 includes a rotating shaft 61, a spring shaft 62 and a movable contact 63, two spring shaft receiving cavities 611 and two spring receiving cavities 612 are provided in the rotating shaft 61, the spring shaft 62 is provided in the spring shaft receiving cavity 611, a special-shaped spring 64 is provided in the spring receiving cavity 612, the special-shaped spring 64 is two segments of tension springs 641 which are provided in parallel at a certain interval, and has one end connected together, the other end fixed to the spring shaft 62, the movable contact 63 is provided in the interval between the two tension springs 641 of the special-shaped spring 64, two side faces of the movable contact 63 are attached to the tension springs 641, two opposite end arms 633 are provided in an oblique symmetry manner on the movable contact 63, a first groove 632 and a second groove 631 are provided at the beginning of the end arms 633, both the first groove 632 and the second groove 631 can be elastically fixed with a special-shaped spring connecting portion 642, the movable contact is elastically limited and fixed by using the special-shaped spring, compared with the prior art, the planer has the advantages that redundant parts such as the fixed shaft, the fixed plate and the like are planed, and the planer is simple and reasonable in structure, easy to manufacture and easy to assemble on the premise of ensuring complete functions and reliable performance.

Two connecting through holes 613 are symmetrically arranged on the end surface of the rotating shaft 1 and are used for connecting other components in the circuit breaker.

The end face of the rotating shaft is provided with a cylindrical protrusion 614 which is matched with a corresponding groove on the outer shell 2 when rotating, so that the limiting effect is achieved.

The end of the end arm 633 of the moving contact 63 is provided with a silver contact 634 facing opposite directions, and the silver contact is matched with the silver contact of the static contact 3.

Further, the rotary moving contact device 6 may be disposed in a breaking unit of the molded case circuit breaker, or disposed in the molded case circuit breaker.

As shown in fig. 8, a plurality of breaking units can be combined together through a dedicated base 13, and controlled by an operating mechanism 14 in a unified manner, so that the breaking units can be switched on manually or electrically, after a moving contact 63 and a static contact 3 are closed, a free tripping mechanism locks the closed contact at the switching-on position, and when a circuit fails, the circuit automatically trips through respective actions of rotating the moving contact devices 6, so as to achieve a protection effect.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the utility model is not limited by the scope of the appended claims.

Claims

1. The utility model provides a disconnected unit of high-efficient arc extinguishing, includes casing (2), static contact (3) and moving contact (7), its characterized in that: be equipped with first explosion chamber (92) and second explosion chamber (93) in casing (2), all be equipped with arc extinguishing bars group (91) in first explosion chamber (92) and second explosion chamber (93), static contact (3) are the crotch form, be equipped with magnetic device (4) and crotch and be equipped with first arc-insulating cover (10) outward in the crotch of static contact (3), magnetic device (4) both ends parallel arrangement magnetic conductive plate (5), magnetic conductive plate (5) lower extreme sets up second arc-insulating cover (8), static contact (3) and moving contact (7) are in the middle of parallel magnetic conductive plate (5) action and the direction of action is perpendicular with magnetic conductive plate (5), it is parallel with static contact (3) to inlay on casing (2) inner wall and leads arc piece (1).

2. A breaking unit for efficient arc extinction as claimed in claim 1, wherein: the arc extinguishing grid group (91) is composed of a plurality of arc extinguishing grid pieces (911) arranged in parallel and arc isolating plates (912) arranged at two ends and used for fixing the arc extinguishing grid pieces.

3. A breaking unit for efficient arc extinction as claimed in claim 1, wherein: the explosion chamber is equipped with gas outlet (11), the gas outlet goes out to be equipped with flashover baffle (12).

4. A breaking unit for efficient arc extinction as claimed in claim 1, wherein: the magnetic conduction device consists of a magnetic conduction coil (41) and an iron core (42) penetrating through the coil.

5. A breaking unit for efficient arc extinction as claimed in claim 1, wherein: and a clamp spring (81) which is used for being embedded into the shell to fix is arranged on the second arc-isolating cover (8).

6. A breaking unit for efficient arc extinction as claimed in claim 1, wherein: the fixed contact is divided into a long fixed contact (31) and a short fixed contact (32), the long fixed contact (31) is arranged in a first arc extinguish chamber (92), and the short fixed contact (32) is arranged in a second arc extinguish chamber (93).

7. A breaking unit for efficient arc extinction according to claim 6, wherein: the first arc-extinguishing chamber (92) and the second arc-extinguishing chamber (93) are identical in internal structure except for the difference of the static contact (3).

8. A breaking unit for efficient arc extinction as claimed in claim 1, wherein: and a rotary moving contact device (6) is arranged between the first arc extinguish chamber (92) and the second arc extinguish chamber (93).

9. A breaking unit for efficient arc extinction as claimed in claim 8, wherein: the shell (2) is divided into a left shell (21) and a right shell (22), and the left shell (21) is connected with the right shell (22) through rivets.

10. A breaking unit for efficient arc extinction as claimed in claim 9, wherein: and clamping grooves for embedding the rotary moving contact device (6), the static contact (3) and the arc extinguishing grid group (91) are symmetrically arranged on the inner walls of the left shell (21) and the right shell (22).