CN219497703U - Electromagnetic arc blowing device of circuit breaker - Google Patents

Abstract

The utility model provides an electromagnetic arc blowing device of a circuit breaker, which at least comprises a fixed contact, a moving contact, an arc extinguishing chamber, a magnetic core, a magnetic conduction sheet, a magnetic increasing sheet, an arc striking sheet and an alloy fixed contact; the magnetic core is arranged at the rear of the alloy stationary contact along the X axis direction and is positioned above the arc extinguishing chamber along the Y axis direction, and the two ends of the magnetic core are provided with magnetic conductive sheets and partially or completely cover the two ends of the Yu Jing contact along the Z axis direction; and an alloy stationary contact is further arranged on the stationary contact, and the magnetic increasing sheet and the magnetic conducting sheet are overlapped. According to the utility model, the magnetic conductive sheet extends to the opening positions of the movable contact and the fixed contact and the inside of the edge of the striking sheet, the magnetic increasing sheet is arranged on the inner wall of the magnetic conductive sheet, and covers the whole arc channel, so that the effect of a magnetic field on the whole arc channel is enhanced when a short circuit is broken, the electric arc is promoted to enter the arc extinguishing chamber rapidly for arc extinguishing, and the breaking capacity of the circuit breaker is improved.

Description

Electromagnetic arc blowing device of circuit breaker

Technical Field

The utility model relates to the field of piezoelectric devices, in particular to an electromagnetic arc blowing device of a circuit breaker.

Background

With the progress of society, small circuit breakers are increasingly used in various similar places such as industry, business, high-rise and residential houses. Meanwhile, the intelligent and volume miniaturization requirements are also provided for the miniature circuit breaker. The current small circuit breaker in the market generally comprises an operating mechanism, an electromagnetic instantaneous protection system, a thermal overload protection system, an arc extinguishing system and the like. The electromagnetic instantaneous protection system can be divided into a clapping type magnetic tripping structure and a screw coil type magnetic tripping structure. In the case of the current breaker in the market, the current breaker in the market has the problem of difficult improvement of breaking performance due to smaller current or insufficient magnetism in the magnetic tripping structure.

In view of the foregoing, it is necessary to provide an electromagnetic arc blowing device of a circuit breaker to solve the above-mentioned problems.

Disclosure of Invention

Based on the background, the utility model aims to provide an electromagnetic arc blowing device of a circuit breaker, which extends a magnetic conduction sheet to the opening positions of a movable contact and a fixed contact and the inside of the edge of an arc striking sheet, and covers the whole arc path by arranging a magnetic increasing sheet, so that the effect of a magnetic field on the whole arc path is enhanced when a short circuit is broken, the arc is promoted to enter an arc extinguishing chamber rapidly to extinguish the arc, and the breaking capacity of the circuit breaker is improved.

The utility model discloses an electromagnetic arc blowing device of a circuit breaker, which at least comprises a fixed contact, a moving contact, an arc extinguishing chamber, a magnetic core, a magnetic conduction sheet, a magnetic increasing sheet, an arc striking sheet and an alloy fixed contact; the magnetic core is arranged at the rear of the alloy stationary contact along the X-axis direction and is positioned above the arc extinguishing chamber along the Y-axis direction; magnetic conductive sheets are arranged at the two ends of the magnetic core and partially or completely cover the two ends of the Yu Jing contact in the Z-axis direction; the magnetic increasing sheets and the magnetic conducting sheets are overlapped.

In the embodiment, the short-circuit protection is realized through the design on the static contact structure, and according to the arrangement of the internal space of the circuit breaker, the functions are expanded while the volume of the circuit breaker is not increased, and when the short circuit is broken, the whole arc channel is acted by a magnetic field, so that the electric arc is promoted to enter the arc extinguishing chamber rapidly to extinguish the arc. The existing magnetic field can be gathered after the magnetic increasing sheet is arranged, the magnetic increasing sheet has a certain thickness and is further close to an electric arc, so that the force of the magnetic field acting on the electric arc is larger, the electric arc is accelerated to enter the arc extinguishing chamber, and the breaking capacity is improved.

In some embodiments, the alloy stationary contact is provided with a moving contact for switching on and off at the front of the X axis direction.

In the embodiment, when the movable contact and the fixed contact are separated, an electric arc is generated, an induced magnetic field generated by the fixed contact is transferred to the opening positions of the movable contact and the fixed contact through the magnetic conduction sheet and the magnetic increasing sheet, and an arc blowing operation is performed, so that the breaking capacity of the circuit breaker is improved.

In some embodiments, the magnetic conductive sheet extends to the opening positions of the fixed contact and the moving contact along the X-axis direction and downward to the edge of the striking sheet to reach the end part of the arc extinguishing chamber along the X-axis direction.

In the above embodiment, the magnetic conductive sheet extends to the opening positions of the moving contact and the static contact and the edge of the striking sheet, the arc starts to occur from the moving contact and the static contact, and is guided to the arc extinguishing chamber through the striking sheet, and the magnetic conductive sheet covers the arc movement position, so that the arc is always blown, and the arc is further accelerated to be transferred to the arc extinguishing chamber.

In some embodiments, two magnetic increasing sheets are arranged on the inner side of the magnetic conduction sheet and cover the opening position of the moving contact, and the magnetic increasing sheets extend to the edge of the striking sheet to reach the end part of the arc extinguishing chamber along the X-axis direction.

In the embodiment, the magnetic field dispersing on the magnetic conductive sheet is concentrated by the magnetic increasing sheet and acts on the whole arc generating area in a concentrated manner, so that the acting force of the magnetic field received by the arc is larger, the speed of the arc entering the arc extinguishing chamber is higher, and the breaking capacity of the circuit breaker is improved.

In some embodiments, the magnetic core is surrounded by a stationary contact, either partially or fully, or a plurality of turns.

In the above embodiment, the partial or total enclosure is adopted under the rated current of a large specification, the multi-turn enclosure is adopted under the rated current of a small specification, the setting is performed according to the rated current, the stronger the magnetic field generated by the more turns is, and the larger the current is, the generated magnetic field strength is.

In some embodiments, the stationary contact conductor is disposed around the magnetic core in a spiral around the magnetic core when the stationary contact is surrounded by a plurality of turns.

In the above embodiment, the magnetic field generated by the current is superimposed and enhanced by spirally winding the magnetic core in a structural layout

In some embodiments, one end of the fixed contact is directly or indirectly connected to a wiring terminal of the circuit breaker after surrounding the magnetic core.

In the above embodiment, the power supply is introduced from the connection terminal to the coil part of the fixed contact, and the fixed contact can be selectively connected with the connection terminal directly in an integrated manner, and can be divided into multiple sections for combination when multiple turns of winding are needed.

In some embodiments, the other end of the fixed contact extends around the magnetic core to the upper end of the arc-extinguishing chamber along the Y-axis direction, and a gap is kept between the fixed contact and the arc-extinguishing chamber.

In the embodiment, the electric arc can enter the arc extinguishing chamber according to the set path, so that burning loss of the electric arc to the contact is reduced, the number of arc cutting sections can be increased in a gap between the electric arc and the arc extinguishing chamber, the voltage drop of the electric arc is improved, and the arc extinguishing speed is accelerated.

In some embodiments, the inner sides of the magnetic conductive sheet and the magnetic increasing sheet are also provided with an insulating part which can generate gas when encountering high-temperature burning, and an arc passage is formed between the insulating part and the fixed contact and between the insulating part and the arc striking sheet to reach the end part of the arc extinguishing chamber in the X-axis direction.

In the embodiment, the insulating piece prevents breakdown between the magnetic conductive sheet of the magnetic increasing sheet and the arc striking sheet, the moving contact and the electric arc, and the insulating piece has the mixed gas containing hydrogen generated by burning the electric arc, so that the effects of blowing and rapidly eliminating free arc extinguishing are realized.

In some embodiments, the magnetic conducting sheet and the magnetic increasing sheet are made of sheet-like ferromagnetic material.

In the embodiment, the magnetic conductive sheet and the magnetic reinforcing sheet are made of sheet ferromagnetic materials, and the large-scale mass production can be realized due to the fact that the sheet ferromagnetic materials are produced by stamping, and the efficiency is high and the cost is low.

The beneficial effects of the utility model are as follows:

1. through set up the magnetic amplification sheet on the magnetic conduction sheet to extend the magnetic conduction sheet to moving, static contact open position and striking piece edge inside, make the magnetic amplification sheet cover whole arc way, when the short circuit divides disconnected, whole arc way receives the effect reinforcing of magnetic field, makes electric arc get into the explosion chamber fast, has promoted the breaking capacity of circuit breaker.

2. By arranging the shapes of the magnetic conductive sheet and the magnetic increasing sheet thereof, the magnetic strength of an electromagnetic field in an electromagnetic arc blowing device of the circuit breaker is obviously improved, so that the magnetic field strength between the fixed contact and the moving contact is increased, and the separation of the fixed contact and the moving contact is quickened while the magnetic blowing of an electric arc is realized.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some of the embodiments described in the utility model, and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a circuit breaker including an electromagnetic arc blowing apparatus according to the present embodiment;

fig. 2 is a schematic diagram of an explosion structure of the electromagnetic arc blowing device disclosed in the present embodiment;

fig. 3 is a schematic structural view of the electromagnetic arc blowing device disclosed in the present embodiment;

fig. 4 is a schematic structural diagram of a connection relationship between a fixed contact and a connection terminal disclosed in the present embodiment;

fig. 5 is a schematic structural diagram of the positional relationship of the insulating member disclosed in the present embodiment;

FIG. 6 is a schematic diagram of the induced magnetic field of the current through the stationary contact and the magnetic core according to the present embodiment;

fig. 7 is a schematic structural diagram of the stationary contact according to the present embodiment surrounding the circular magnetic core for multiple turns.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model become more apparent, the technical solutions in the embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings in the embodiments of the present utility model. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the utility model. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 4, the present embodiment discloses an electromagnetic arc blowing device of a circuit breaker, at least comprising a fixed contact 200, a moving contact 300, an arc extinguishing chamber 400, a magnetic core 101, a magnetic conductive sheet 102, a magnetic increasing sheet 103, an arc striking sheet 500 and an alloy fixed contact 201; in order to facilitate the direction indication in this embodiment, please refer to fig. 1, the direction is indicated by a rectangular coordinate line through X, Y and the Z axis. The magnetic core 101 is arranged at the rear of the alloy stationary contact 201 along the X axis direction and is positioned above the arc extinguishing chamber 400 along the Y axis direction; the two ends of the magnetic core 101 are provided with magnetic conducting sheets 102, and the magnetic conducting sheets 102 partially or completely cover the two ends of the Yu Jing contact 200 along the Z-axis direction; the magnetic increasing sheet 103 is overlapped and arranged on the inner wall side of the magnetic conductive sheet 102. Further, the alloy stationary contact 102 is provided with a movable contact 300 for switching on and off at the front in the X axis direction, where the movable contact 300 and the alloy stationary contact 102 are in a contactless and connecting relationship. The magnetic core 101 is arranged in the bending windings of the fixed contact 200, the magnetic conduction sheets 102 arranged at the two ends of the magnetic core 101 are utilized to guide the magnetic field to the position where the electric arc occurs, the transfer of the electric arc is accelerated, the existing magnetic field can be gathered after the magnetic enhancement sheet 103 is arranged, and the magnetic enhancement sheet 103 is enabled to be further close to the electric arc due to the fact that the magnetic enhancement sheet 103 has a certain thickness. Due to the arrangement of the magnetic increasing sheet 103, the magnetic strength between the fixed contact 200 and the moving contact 300 is improved, so that when the fixed contact 200 and the moving contact 200 are disconnected, the effect of a magnetic field on the whole arc channel is increased when the arc channel is in short circuit breaking, the arc is promoted to enter the arc extinguishing chamber 400 more quickly, and the arc extinguishing and breaking capacity of the circuit breaker is improved.

In this embodiment, the whole circuit breaker further includes an insulating housing, an operating mechanism, a shunt release, and a current transformer; the operating mechanism drives the moving contact 300 and the fixed contact 200 to be electrically connected and disconnected; the moving contact 300 can be controlled to rotate by operating the handle, so that the circuit breaker can be switched on and off.

Preferably, the magnetic conductive sheet 102 extends to the open position of the moving contact 300 along the X-axis direction through the fixed contact 200 and the alloy fixed contact 201, and extends downward to the edge of the striking sheet 500 to the end of the arc extinguishing chamber 400 along the X-axis direction. Because the two magnetic conductive sheets 102 pass through the fixed contact 200 and the alloy fixed contact 201, extend to the moving contact 300 along the X axis direction, and form a pair of arc blowing yokes along the X axis direction between the moving contact 300 and the opening distance of the fixed contact 200, the magnetic conductive sheets 102 can guide the magnetic field of the magnetic core 101 to the arc blowing yokes, and then can perform electromagnetic arc blowing on the electric arcs at the opening positions of the moving contact 300 and the fixed contact 200. The magnetic conductive sheet 102 guides the induction magnetic field of the magnetic core 101 to the opening position of the moving and static contacts and the place where the electric arc passes, and then performs electromagnetic arc blowing on the electric arc in the whole process, and because the magnetic conductive sheet 102 extends to the opening position of the moving and static contacts and the edge of the striking sheet 500, the electric arc starts to occur at the driven and static contacts, and when the electric arc is guided to the arc extinguishing chamber 400 through the striking sheet 500, the magnetic conductive sheet 102 covers the arc movement position, so that the electric arc can be always blown.

In this embodiment, at least two magnetic increasing pieces 103 are disposed on the inner side of the magnetic conductive piece 102, the magnetic increasing pieces 103 are welded on the inner wall of the magnetic conductive piece 102 and cover the open position of the moving contact 300, the magnetic increasing pieces 103 extend to the edge of the striking piece 500 to reach the end of the arc extinguishing chamber 400 along the X axis direction, and the magnetic increasing pieces 103 cover the open positions of the moving contact 300 and the fixed contact 200 and extend downward to the arc extinguishing chamber 400, when the moving contact 300 and the fixed contact 200 are triggered by the armature, the operating mechanism is changed from the closed state to the open state, high-energy electric arc is generated during the opening of the contacts due to the large current, the burning loss of the moving contact and the fixed contact is very serious, in order to reduce the burning loss, the magnetic core 101 is magnetized by the magnetic field generated by the current, in addition, the covered region of the arc blowing yoke is the region where the electric arc occurs, the action of the electric arc is transferred into the chamber 400 according to the movement in the forced direction, the magnetic field force is larger, the moving speed of the moving magnetic increasing piece 103 adjusts the position of the arc blowing yoke to be closer to the position of the arc extinguishing yoke to the arc path, and the action of the magnetic field of the arc blowing yoke is enhanced.

Preferably, in the circuit breaker provided in this embodiment, the magnetic core 101 is partially or completely surrounded by the stationary contact 200 or surrounded by a plurality of turns. As shown in fig. 6, when an induced magnetic field generated by a current flowing from the stationary contact 200 magnetizes the core 101, the more the magnetic field generated by the surrounding is stronger, and the partial surrounding or the full surrounding is adopted at a rated current of a large specification. In other embodiments, the multi-turn surrounding is adopted under the small rated current specification, the current can be set according to the rated current, the stronger the magnetic field generated by the more turns is, the larger the magnetic field generated by the current is, and in fig. 7, when the static contact 200 is multi-turn surrounding, the conductors of the static contact 200 are spirally arranged around the magnetic core 101. When the multiple turns are surrounded, in order to arrange more turns to be spirally wound, the multiple layers of spiral winding can be adopted according to actual needs, and the magnetic field generated by current is overlapped and enhanced through spiral winding.

Preferably, one end of the fixed contact 200 surrounds the magnetic core 101 and is directly or indirectly connected to the wiring terminal 700 of the circuit breaker; the other end extends around the core 101 to the upper end of the arc extinguishing chamber 400 in the Y-axis direction with a certain gap maintained. The fixed contact 200 can be directly or indirectly connected to the connection terminal 700 according to the actual molding mode, for example, the coil is required to be indirectly connected through a conductor when the coil is required to be arranged in multi-turn winding. In the case of allowing current, the fixed contact 200 may be directly connected to the connection terminal 700, or in the case of simple structure, the fixed contact 200 may be divided into multiple segments for combination by selecting an embodiment in which a plurality of turns are required to be wound, and the connection terminal 700 may be directly connected to the fixed contact 200. In addition, the other end of the fixed contact 200 is a discharge electrode serving as an arc, the arc is guided to the arc-extinguishing chamber 400 according to a guiding path, a gap between the fixed contact 200 and the arc-extinguishing chamber 400 is a gas discharge gap, a section of cutting arc can be added, the arc can enter the arc-extinguishing chamber 400 according to a set path, burning loss of the arc to a contact is reduced, in addition, the number of arc cutting sections can be increased in the gap with the arc-extinguishing, and the pressure drop of the arc is improved to rapidly extinguish the arc.

Preferably, as shown in fig. 5, an insulating member 600 capable of generating gas when being burned under high temperature is further disposed on the inner sides of the magnetic conductive sheet 102 and the magnetic amplifying sheet 103, and an arc passage is formed between the insulating member 600 and the fixed contact 200, and between the insulating member 600 and the arc striking sheet 500, to reach the end of the arc extinguishing chamber along the X-axis direction. In this embodiment, the insulating member 600 is provided to form insulation between the magnetism increasing sheet 103 and the arc to prevent breakdown, on the one hand, and the gas generating insulating material can generate a large amount of gas to strengthen gas-blow arc extinction after encountering the arc, on the other hand. The insulating piece 600 prevents breakdown among the magnetic increasing sheet 103, the magnetic conducting sheet 102, the arc striking sheet 400 and the moving contact 300, and the insulating material also has the mixed gas containing hydrogen generated by arc burning, thereby realizing the effects of air blowing and quick free extinction and arc extinction. On the other hand, the magnetic conducting sheet 102 and the magnetic increasing sheet 103 are made of sheet ferromagnetic materials, the magnetic field of the magnetic core is conducted to the position required by arc blowing by utilizing the magnetic conducting property of the ferromagnetic materials, the sheet structure is well realized from the production process, and in addition, the sheet ferromagnetic materials are adopted for manufacturing the magnetic conducting sheet 102 and the magnetic increasing sheet 103 to produce by utilizing stamping work, so that large-scale batch production can be realized, and the efficiency is high and the cost is low.

The present utility model may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1. An electromagnetic arc blowing device of a circuit breaker is characterized by at least comprising a fixed contact, a moving contact, an arc extinguishing chamber, a magnetic core, a magnetic conduction sheet, a magnetic increasing sheet, an arc striking sheet and an alloy fixed contact;

the magnetic core is arranged at the rear of the alloy stationary contact along the X axis direction and is positioned above the arc extinguishing chamber along the Y axis direction, the two ends of the magnetic core are provided with magnetic conduction sheets, and the magnetic conduction sheets partially or completely cover the two ends of the Yu Jing contact along the Z axis direction;

the magnetic increasing sheets and the magnetic conducting sheets are overlapped.

2. The electromagnetic arc blowing device of the circuit breaker according to claim 1, wherein the alloy stationary contact is provided with a moving contact for switching on and off in front of the X axis direction.

3. The electromagnetic arc blowing apparatus of the circuit breaker according to claim 1, wherein the magnetically conductive sheet extends in the X-axis direction to an open position of the stationary contact and the moving contact and downward to an edge of the striking sheet up to an end of the arc extinguishing chamber in the X-axis direction.

4. The electromagnetic arc blowing device of the circuit breaker according to claim 1, wherein at least two magnetic increasing sheets are arranged on the inner side of the magnetic conduction sheet and cover the opening position of the moving contact, and the magnetic increasing sheets extend to the edge of the arc striking sheet to reach the end part of the arc extinguishing chamber along the X-axis direction.

5. The electromagnetic arc blowing device of a circuit breaker according to claim 1, characterized in that the magnetic core is surrounded by stationary contacts partially or completely or by a plurality of turns.

6. The electromagnetic arc blowing apparatus of the circuit breaker according to claim 1, wherein the stationary contact is spirally arranged around the conductor of the magnetic core when the stationary contact is wound around the magnetic core in a plurality of turns.

7. The electromagnetic arc blowing apparatus of the circuit breaker according to claim 5, wherein the stationary contact has one end surrounding the magnetic core and is directly or indirectly connected to a connection terminal of the circuit breaker.

8. The electromagnetic arc blowing apparatus of the circuit breaker according to claim 7, wherein the other end of the stationary contact extends around the magnetic core to an upper end portion of the arc extinguishing chamber in the Y-axis direction, and is kept in a gap with the arc extinguishing chamber.

9. The electromagnetic arc blowing device of the circuit breaker according to claim 1, wherein the inner sides of the magnetic conductive sheet and the magnetic increasing sheet are also provided with an insulating piece which generates gas when being burnt at high temperature, and an arc passage is formed between the insulating piece and the static contact and the arc striking sheet to reach the end part of the arc extinguishing chamber along the X axis direction.

10. The electromagnetic arc blowing apparatus of the circuit breaker according to claim 1, wherein the magnetic conductive sheet and the magnetism increasing sheet are made of sheet-shaped ferromagnetic material.