CN211980548U

CN211980548U - Circuit breaker that arc extinguishing performance is high

Info

Publication number: CN211980548U
Application number: CN202020692248.XU
Authority: CN
Inventors: 李俊伟
Original assignee: Zhangzhou Tailian Electric Power Technology Co ltd
Current assignee: Zhangzhou Tailian Electric Power Technology Co ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-11-20
Anticipated expiration: 2030-04-29

Abstract

The utility model belongs to the technical field of the circuit breaker technique and specifically relates to a circuit breaker that arc extinguishing performance is high, including the circuit breaker body, the inside of circuit breaker body is provided with the insulating chamber, the inside of insulating chamber is provided with static contact and moving contact each other symmetrically, static contact and moving contact set up the both ends between two arc extinguishing subassemblies respectively, the arc extinguishing subassembly includes two connecting plates, two connecting plate fixed connection are in one side of the inner wall of arc extinguishing chamber, the middle part position that the indoor lateral wall one end of arc extinguishing chamber was kept away from to a plurality of arc extinguishing bars piece is equallyd divide and is do not seted up first breach, the middle part position of bottom is equallyd divide and does not have seted up the second breach in the first breach of a plurality of, keep away from one side fixedly connected with aluminium system shielding. The arc extinguishing assembly of the circuit breaker with high arc extinguishing performance has good arc extinguishing effect and stable and reliable structure.

Description

Circuit breaker that arc extinguishing performance is high

Technical Field

The utility model relates to a circuit breaker technical field especially relates to a circuit breaker that arc extinguishing performance is high.

Background

The molded case circuit breaker can automatically cut off the current after the current exceeds the trip setting. In the action process of breaking the load of the molded case circuit breaker, the voltage between the moving contact and the fixed contact causes the air dielectric to discharge to form electric arcs, so that in a circuit breaker switch, an arc extinguishing cover is usually arranged to extinguish the electric arcs generated between the two contacts, thereby ensuring the safe operation of electrical equipment. The existing arc-extinguishing cover is unreasonable in structural design, when short-circuit current is generated between the moving contact and the static contact, the arc-extinguishing cover cannot extinguish electric arcs quickly and effectively, the arc-extinguishing effect is poor, and the use safety of the circuit breaker cannot be effectively ensured.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the arc extinguishing effect that exists among the prior art relatively poor, can't extinguish the shortcoming of electric arc fast effectively, and the circuit breaker that arc extinguishing performance is high that provides.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the design is a circuit breaker with high arc extinguishing performance, and comprises a circuit breaker body, the inside of circuit breaker body is provided with the insulating chamber, the inside of insulating chamber is provided with the explosion chamber, the inside of circuit breaker body is provided with static contact and moving contact symmetrically each other, just the static contact with the tip of moving contact is equallyd divide and is do not set up the inside of explosion chamber, the both sides of the inner wall of explosion chamber are equallyd divide respectively fixedly connected with arc extinguishing component, and two be relative setting between the arc extinguishing component, the static contact with the moving contact sets up two respectively both ends between the arc extinguishing component, the arc extinguishing component includes two connecting plates, two connecting plate fixed connection is in one side of the inner wall of explosion chamber, two be provided with a plurality of arc extinguishing bars piece, a plurality of evenly respectively through a plurality of latch mechanism between the connecting plate keep away from the middle part position of the inner wall one end And a plurality of second notches are respectively formed in the middle positions of the bottoms in the first notches, two aluminum shielding frames are fixedly connected to one sides of the fixed contacts and far away from the connecting plates, and aluminum shielding ventilating plates are fixedly connected to the aluminum shielding frames.

Preferably, latch mechanism includes two spouts and two draw bars, two the spout is seted up respectively two one side that the connecting plate is relative, and two spout one end is equallyd divide and is do not extended to two the terminal surface department of connecting plate, two the draw bar is fixed connection respectively in the both ends of arc extinguishing bars piece, and two the draw bar is equallyd divide and is established respectively slidable ground card two in the spout.

Preferably, the sliding groove is a dovetail groove, the sliding strip is a strip-shaped structural member with a dovetail-shaped vertical section, and the sliding strip and the sliding groove are mutually matched.

Preferably, the aluminum shielding ventilation plate is a honeycomb structural member.

Preferably, each end corner in the first notch is of a round angle structure, and the second notch is of an arc-shaped notch structure.

Preferably, two end corners of the arc extinguishing grid sheet far away from one end of the first notch are both in a chamfer structure.

The utility model provides a pair of circuit breaker that arc extinguishing performance is high, beneficial effect lies in:

1. this circuit breaker that arc extinguishing performance is high installs the explosion chamber in the inside of insulating chamber, and the insulating chamber in this design is vacuum moreover to can guarantee the inside effectual arc extinguishing process of explosion chamber, improve the security of this circuit breaker.

2. This circuit breaker that arc extinguishing performance is high passes through the setting of arc extinguishing subassembly, when having produced short-circuit current between static contact and the moving contact, the temperature on two contact surfaces of static contact and moving contact sharply increases, lead to air discharge on every side, because gaseous free production electric arc, electric arc current produces the magnetic flux in surrounding space, magnetize a plurality of arc extinguishing bars piece, a plurality of arc extinguishing bars piece will produce one kind with the gravitation that electric arc attracted to come, will be cut apart into the short arc of a plurality of series connection after electric arc enters into a plurality of arc extinguishing bars piece, and after the short arc was hugged closely to a plurality of arc extinguishing bars piece, make arc resistance increase, arc voltage rises, when arc voltage rises to the power frequency recovery voltage who is greater than the contact both ends, electric arc has just been extinguished. In addition, through be equipped with first breach and second breach on the arc extinguishing bars piece to can further strengthen the segmentation effect of arc extinguishing bars piece to electric arc, and then can further promote the arc extinguishing effect.

3. This circuit breaker that arc extinguishing performance is high passes through the setting of aluminium system shielding frame and aluminium system shielding ventilating board, not only can improve ventilation performance, has strengthened the radiating effect, can play the shielding effect to electric arc moreover effectively to can further improve the effect of arc extinguishing, can effectively ensure the security of this circuit breaker.

Drawings

Fig. 1 is the utility model provides a structural schematic diagram of circuit breaker that arc extinguishing performance is high.

Fig. 2 is a top view of the arc extinguishing assembly of fig. 1.

Fig. 3 is a side view of the structure of one side of fig. 2.

Fig. 4 is a side view of the structure of the other side of fig. 2.

In the figure: the circuit breaker comprises a circuit breaker body 1, an insulating chamber 2, an arc extinguishing chamber 3, a static contact 4, a movable contact 5, an arc extinguishing component 6, a connecting plate 61, a sliding groove 62, a sliding strip 63, a first gap 64, a second gap 65, an arc extinguishing grid sheet 66, an aluminum shielding ventilating plate 67 and an aluminum shielding frame 68.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Example 1

Referring to fig. 1-4, a circuit breaker with high arc extinguishing performance comprises a circuit breaker body 1, an insulating chamber 2 is arranged inside the circuit breaker body 1, an arc extinguishing chamber 3 is arranged inside the insulating chamber 2, a fixed contact 4 and a movable contact 5 are symmetrically arranged inside the circuit breaker body 1, the ends of the fixed contact 4 and the movable contact 5 are equally divided into the inner part of the arc extinguishing chamber 3, the arc extinguishing chamber 3 is installed inside the insulating chamber 2, and the insulating chamber 2 in the design is vacuum, so that an effective arc extinguishing process inside the arc extinguishing chamber 3 can be guaranteed, and the safety of the circuit breaker is improved.

Arc extinguishing components 6 are fixedly connected to two sides of the inner wall of the arc extinguish chamber 3 respectively, the two arc extinguish components 6 are arranged oppositely, the static contact 4 and the moving contact 5 are arranged at two ends between the two arc extinguish components 6 respectively, each arc extinguish component 6 comprises two connecting plates 61, the two connecting plates 61 are fixedly connected to one side of the inner wall of the arc extinguish chamber 3, a plurality of arc extinguish grid plates 66 are uniformly arranged between the two connecting plates 61 through a plurality of clamping mechanisms respectively, first notches 64 are arranged at the middle positions of the arc extinguish grid plates 66 far away from one end of the inner side wall of the arc extinguish chamber 3 respectively, second notches 65 are arranged at the middle positions of the inner bottom of the first notches 64 respectively, two end corners of the arc extinguish grid plates 66 far away from one end of the first notches 64 are chamfer structures, each end corner in the first notches 64 is a fillet structure, and the second notches 65 are arc-shaped notch structures, when short-circuit current is generated between the static contact 4 and the moving contact 5, the temperature of the surfaces of the two contacts of the static contact 4 and the moving contact 5 is increased sharply, so that surrounding air discharge is caused, electric arc is generated due to the dissociation of gas, the electric arc current generates magnetic flux in surrounding space, the plurality of arc-extinguishing grid pieces 66 are magnetized, the plurality of arc-extinguishing grid pieces 66 generate attraction force for attracting the electric arc, the electric arc is divided into a plurality of short arcs connected in series after entering the plurality of arc-extinguishing grid pieces 66, and after the plurality of arc-extinguishing grid pieces 66 are tightly attached to the short arcs, so that the electric arc resistance is increased, the electric arc voltage is increased, and when the electric arc voltage is increased to be larger than the power frequency recovery voltage at the two ends of the contacts. In addition, the arc extinguishing grid plate 66 is provided with the first notch 64 and the second notch 65, so that the arc extinguishing effect of the arc extinguishing grid plate 66 on the electric arc can be further enhanced, and the arc extinguishing effect can be further improved.

Keep away from one side fixedly connected with aluminium system shielding frame 68 of static contact 4 between two connecting plates 61, fixedly connected with aluminium system shielding ventilating board 67 in aluminium system shielding frame 68, aluminium system shielding ventilating board 67 is cellular structure spare, through aluminium system shielding frame 68 and aluminium system shielding ventilating board 67's setting, not only can improve ventilation performance, strengthened the radiating effect, can play the shielding effect to electric arc effectively moreover, thereby can further improve the effect of arc extinguishing, can effectively ensure the security of this circuit breaker.

Example 2

Referring to fig. 2-3, as another preferred embodiment of the present invention, the difference from embodiment 1 is that the latch mechanism includes two sliding grooves 62 and two sliding bars 63, the two sliding grooves 62 are respectively opened at one side opposite to the two connecting plates 61, and one end of the two sliding grooves 62 respectively extends to the end surfaces of the two connecting plates 61, the two sliding bars 63 are respectively fixedly connected to both ends of the arc-extinguishing fence 66, and the two sliding bars 63 are respectively slidably engaged in the two sliding grooves 62, the sliding grooves 62 are dovetail grooves, the sliding bars 63 are strip-shaped structural members with dovetail-shaped vertical cross-sections, and the sliding bars 63 and the sliding grooves 62 are mutually adapted, by adopting the arrangement of the dovetail-shaped sliding bars 63 and the sliding grooves 62, not only the assembling process of the plurality of arc-extinguishing fence 66 can be facilitated, but also the sliding bars 63 do not separate from the sliding grooves 62 during the sliding process of the sliding grooves 62, therefore, the stability of the arc chute plates 66 in the assembling and moving process can be ensured, and the stability of the whole structure of assembling a plurality of arc chute plates 66 between the two connecting plates 61 can be enhanced.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A circuit breaker with high arc extinguishing performance comprises a circuit breaker body (1), wherein an insulating chamber (2) is arranged inside the circuit breaker body (1), an arc extinguishing chamber (3) is arranged inside the insulating chamber (2), a fixed contact (4) and a movable contact (5) are symmetrically arranged inside the circuit breaker body (1), the ends of the fixed contact (4) and the movable contact (5) are equally distributed inside the arc extinguishing chamber (3), the circuit breaker is characterized in that arc extinguishing components (6) are fixedly connected to the two sides of the inner wall of the arc extinguishing chamber (3) respectively, the two arc extinguishing components (6) are arranged oppositely, the fixed contact (4) and the movable contact (5) are arranged at the two ends between the two arc extinguishing components (6) respectively, and each arc extinguishing component (6) comprises two connecting plates (61), two connecting plate (61) fixed connection is in one side of explosion chamber (3) inner wall, two be provided with a plurality of arc extinguishing bars piece (66), a plurality of uniformly respectively through a plurality of latch mechanism between connecting plate (61) arc extinguishing bars piece (66) are kept away from the middle part position of explosion chamber (3) inside wall one end is equallyd divide and has do not seted up first breach (64), a plurality of the middle part position of bottom is equallyd divide and has do not seted up second breach (65), two keep away from between connecting plate (61) one side fixedly connected with aluminium system shield frame (68) of static contact (4), fixedly connected with aluminium system shield ventilating board (67) in aluminium system shield frame (68).

2. The circuit breaker with high arc extinguishing performance according to claim 1, wherein the latch mechanism comprises two sliding grooves (62) and two sliding bars (63), two sliding grooves (62) are respectively formed on one side of the two connecting plates (61) opposite to each other, one ends of the two sliding grooves (62) respectively extend to the end faces of the two connecting plates (61), the two sliding bars (63) are respectively fixedly connected to two ends of the arc extinguishing grid piece (66), and the two sliding bars (63) are respectively slidably clamped in the two sliding grooves (62).

3. The circuit breaker with high arc extinguishing performance according to claim 2, wherein the sliding groove (62) is a dovetail groove, the sliding strip (63) is a strip-shaped structural member with a dovetail-shaped vertical section, and the sliding strip (63) and the sliding groove (62) are mutually matched.

4. The circuit breaker with high arc extinguishing performance according to claim 1, characterized in that the shielding and ventilating plate (67) made of aluminum is a honeycomb structure.

5. The circuit breaker with high arc extinguishing performance according to claim 1, wherein each corner in the first notch (64) is in a round angle structure, and the second notch (65) is in an arc-shaped notch structure.

6. The circuit breaker with high arc extinguishing performance according to claim 1, wherein two corners of the arc extinguishing grid (66) far away from one end of the first notch (64) are both in a chamfer structure.