CN217983188U

CN217983188U - Circuit breaker

Info

Publication number: CN217983188U
Application number: CN202221612417.XU
Authority: CN
Inventors: 臧卫; 高腾飞; 张澳; 邓明凯; 谢思涵
Original assignee: Shanghai Tianyixing Intelligent Electric Co ltd; Zhejiang Tengen Intelligent Electrical Appliance Co ltd; Zhejiang Tengen Electric Co Ltd
Current assignee: Shanghai Tianyixing Intelligent Electric Co ltd; Zhejiang Tengen Intelligent Electrical Appliance Co ltd; Zhejiang Tengen Electric Co Ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-12-06
Anticipated expiration: 2032-06-27

Abstract

The utility model discloses a circuit breaker, it includes base, upper cover, moving contact, pivot, the moving contact is installed in the pivot and the pivot rotation relatively, its characterized in that: the front end of pivot sets up to first arc surface, the base is equipped with the second arc surface with pivot complex position, form the clearance that is used for blockking electric arc between first arc surface and the second arc surface, the bottom of second arc surface is equipped with the recess for the anterior segment clearance is less than the back end clearance. The rotating shaft is matched with the base and is close to the arc extinguish chamber, the rotating shaft is matched with the base to form a circular arc surface, the gap is small, a large space is reserved at the rear part, and mechanism clamping stagnation caused by metal particles entering the gap between the rotating shaft and the base is avoided.

Description

Circuit breaker

Technical Field

The utility model particularly relates to a circuit breaker.

Background

The function of the circuit breaker to break overload or short-circuit current is mainly accomplished by an arc extinguishing chamber installed in the circuit breaker. When fault current occurs in the circuit and the current value exceeds the set protection range of the intelligent controller, the operating mechanism is driven to act, so that the movable contact and the fixed contact of the circuit breaker are quickly disconnected, and at the moment, the air medium is discharged due to the voltage between the movable contact and the fixed contact, so that high-temperature electric arc is generated. The arc causes a sharp rise in the air temperature inside the arc extinguishing device during the combustion process, thereby accelerating the ionization of the air. On the other hand, the electric arc is divided into a plurality of short arcs by a plurality of arc isolating grid pieces under the pushing of the magnetic field and the fluid effect in the arc extinguishing chamber, the deionization effect of the electric arc is enhanced by the metal arc isolating pieces, the electric arc is reduced, the voltage is rapidly increased, and the electric arc is extinguished.

In order to solve the problem that electric arcs enter the direction of the mechanism, most of the existing circuit breakers can utilize the arc blocking plate to block the electric arcs, but because a gap exists between the rotating shaft and the base of the circuit breaker, when the existing circuit breaker breaks large current, the electric arcs often spray in the opposite direction of an arc extinguish chamber, a large number of metal particles appear in the gap at the rotating shaft of the mechanism, and the circuit breaker cannot be normally switched on and off after being broken.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a circuit breaker.

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

the utility model provides a circuit breaker, its includes base, upper cover, moving contact and pivot, the moving contact is installed in the pivot and the pivot rotates relatively, the front end of pivot sets up to first arc surface, the base is equipped with the second arc surface with pivot complex position, form the clearance that is used for blockking electric arc between first arc surface and the second arc surface, the bottom of second arc surface is equipped with the recess for the anterior segment clearance is less than the back end clearance.

Be equipped with the baffle that has the slit between pivot and the explosion chamber, the upper end of baffle is equipped with keeps off the arc structure.

The arc blocking structure comprises:

the bottom of the inserting part is provided with an inserting groove which can be matched with the upper side of the partition plate;

an arc blocking part which is positioned below the inserting part and is provided with an arc blocking groove with an opening facing the arc extinguishing chamber,

the arc blocking groove and the slit are enclosed to form an accommodating space with an opening facing the direction of the arc extinguishing chamber, and the moving contact can swing in the accommodating space.

The inserting groove is of a labyrinth groove structure.

And the upper cover is correspondingly provided with a limiting groove for limiting the arc blocking structure.

The baffle is located the both sides of slit and is equipped with the guide way, keep off the structural correspondence of arc and be equipped with rather than the complex slider.

And limiting plates which are in limiting fit with the partition plates are arranged on two sides of the arc blocking structure.

The utility model has the advantages that: the rotating shaft is matched with the base and is close to the arc extinguish chamber, the rotating shaft is matched with the base through the arc surface and the arc surface, the gap is small, a large space is reserved at the rear part, and the clamping stagnation of a mechanism caused by metal particles entering the gap between the rotating shaft and the base is avoided.

Drawings

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

Fig. 2 is a schematic diagram of the internal structure of the present invention.

Fig. 3 is a cross-sectional view of the present invention.

Fig. 4 is a schematic view of the movable contact and the rotating shaft of the present invention.

Fig. 5 is an enlarged schematic view of the partition plate of the present invention.

Fig. 6 is a schematic structural diagram of the arc blocking structure of the present invention.

Fig. 7 is a sectional view of the arc-blocking structure of the present invention.

Fig. 8 is a schematic structural view of another angle of the arc blocking structure according to the present invention.

Fig. 9 is a schematic structural view of the upper cover of the present invention.

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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

As shown in the figure, the utility model discloses a circuit breaker, it includes base 1, upper cover 2, moving contact 5 and pivot 3, and the base closes with the upper cover and forms a cavity, but the moving contact is installed in the pivot and the pivot is rotated relatively, and the rotatable setting of pivot is on the base simultaneously, the front end of pivot 3 sets up to first arc surface 31, the base is equipped with second arc surface 13 with pivot complex position, form the clearance 6 that is used for blockking electric arc between first arc surface and the second arc surface, first arc surface and second arc surface match can be in the overall process that the moving contact was opened electric arc as far as possible backward flow between first arc surface and the second arc surface, the bottom of second arc surface is equipped with recess 7 for the anterior segment clearance is less than the back end clearance.

Be equipped with the baffle 8 that has slit 83 between pivot and the explosion chamber, the upper end of baffle is equipped with keeps off arc structure 4. The arc extinguish chamber and the main shaft chamber in the base are separated through the partition plate, the middle of the partition plate is provided with a vertically arranged slit, and the arc extinguish chamber is communicated with the main shaft chamber through the slit. The moving contact stretches into the arc extinguish chamber through the narrow slit, and the moving contact and the static contact in the arc extinguish chamber swing to be separated and combined, so that the opening and closing actions are realized.

After an electric arc is generated between the moving contact and the static contact, the gas in the arc extinguishing chamber can expand, the expanded gas contains a lot of metal conductive particles and the like, and the particles are blocked by the rotating shaft, the partition plate and the arc blocking structure in the structure, so that charged particles enter a gap between the rotating shaft and the base as little as possible, and the clamping stagnation of a moving mechanism is prevented. However, in practice, the structure can only reduce charged particles entering the gap as much as possible, but cannot completely isolate the charged particles, so that the charged particles which accidentally enter the gap can be blocked in the gap after a long time of use, and the mechanism is blocked.

And set up the recess with the bottom of second arc surface for the rear end clearance is greater than the anterior segment clearance, can avoid the unexpected metal conductive particle who gets into the clearance, causes the mechanism jamming, and after metal conductive particle got into the clearance, it can be driven by the mechanism and gets into the rear end clearance, and then falls out the clearance, thereby has avoided its jamming to the mechanism causes.

The arc blocking structure comprises:

the bottom of the inserting part 41 is provided with an inserting groove which can be matched with the upper side of the partition plate;

an arc blocking part 42 which is positioned below the inserting part and is provided with an arc blocking groove 45 with an opening facing to the arc extinguishing chamber,

the inserting part and the arc blocking part are integrally formed, the length of the inserting part is greater than the width of the arc blocking part,

the arc blocking groove and the slit enclose to form an accommodating space 9 with an opening facing the arc extinguishing chamber, and the movable contact can swing in the accommodating space.

The arc blocking groove is opposite to the slit, the slit and the arc blocking groove form an accommodating space with an opening facing to one side of the arc extinguish chamber 11 in an enclosing mode, and the movable contact swings in the accommodating space; the arc blocking groove reduces the communication space between the arc extinguish chamber 11 and the main shaft chamber 12, and can block part of high-pressure gas from entering the main shaft chamber, so that electric arcs are extinguished in the arc extinguish chamber, charged particles are greatly reduced from entering the main shaft chamber, and the service life of the circuit breaker is prolonged.

The arc blocking groove is inserted into the top of the partition plate through the insertion groove, and is blocked at a narrow slit of the partition plate, so that the arc blocking groove reduces a communication space between the arc extinguishing chamber and the main shaft chamber; the arc blocking groove can block part of high-pressure gas from entering the spindle chamber, so that electric arcs are extinguished in the arc extinguishing chamber, charged particles are greatly reduced from entering the spindle chamber, and the service life of the circuit breaker is prolonged.

The insertion groove is a labyrinth groove structure 81 which is composed of block structures arranged at the end part of the partition plate in parallel, and two adjacent block structures are arranged in a staggered manner, so that a non-linear groove is formed between the two block structures. And the bottom end of the insertion part forms an insertion part matched with the nonlinear groove, and the end part of the partition plate and the arc blocking structure mounting part form a labyrinth groove structure, so that the arc can be effectively prevented from flowing to the rear part of the circuit breaker from the arc blocking structure and the base mounting gap.

The upper cover is correspondingly provided with a limiting groove 21 for limiting the arc blocking structure, and when the base and the upper cover are closed, the limiting groove plays a role in limiting the arc blocking structure, so that the arc blocking effect is further improved.

The partition plate is provided with guide grooves 82 on two sides of the slit, and the arc blocking structure is correspondingly provided with a sliding block 43 matched with the arc blocking structure, so that the partition plate is matched with the arc blocking structure more closely.

And limiting plates 44 which are in limiting fit with the partition plates are arranged on two sides of the arc blocking structures, so that the arc blocking structures are more attached to the partition plates.

The examples should not be construed as limiting the present invention, but any modifications made based on the spirit of the present invention should be within the scope of the present invention.

Claims

1. The utility model provides a circuit breaker, its includes base, upper cover, moving contact and pivot, the moving contact is installed in the pivot and the pivot rotation relatively, its characterized in that: the front end of pivot sets up to first arc surface, the base is equipped with the second arc surface with pivot complex position, form the clearance that is used for blockking electric arc between first arc surface and the second arc surface, the bottom of second arc surface is equipped with the recess for the anterior segment clearance is less than the back end clearance.

2. A circuit breaker according to claim 1, wherein: be equipped with the baffle that has the slit between pivot and the explosion chamber, the upper end of baffle is equipped with keeps off the arc structure.

3. A circuit breaker as claimed in claim 2, characterized in that: the arc blocking structure comprises:

4. A circuit breaker according to claim 3, wherein: the inserting groove is of a labyrinth groove structure.

5. A circuit breaker according to claim 2, wherein: and the upper cover is correspondingly provided with a limiting groove for limiting the arc blocking structure.

6. A circuit breaker according to claim 2, wherein: the baffle is located the both sides of slit and is equipped with the guide way, keep off the structural correspondence of arc and be equipped with rather than the complex slider.

7. A circuit breaker according to claim 2, wherein: and limiting plates which are in limiting fit with the partition plates are arranged on two sides of the arc blocking structure.