CN111489941A - Non-polar arc extinguishing structure with permanent magnet and miniature circuit breaker - Google Patents

Abstract

The utility model provides a take non-polar arc extinguishing structure and miniature circuit breaker of permanent magnet, the arc extinguishing structure includes the moving contact, the static contact, first permanent magnet, the second permanent magnet, first flash barrier and second flash barrier, the moving contact sets up with the static contact relatively, become the structure of discharging, first permanent magnet, the second permanent magnet sets up respectively in the both sides of structure of discharging, first flash barrier sets up between second permanent magnet and the structure of discharging, and can cover the second permanent magnet, the second flash barrier sets up between first permanent magnet and the structure of discharging, and can cover first permanent magnet. The miniature circuit breaker provided by the invention adopts the nonpolar arc extinguishing structure with the permanent magnet. The invention has simple structure and low manufacturing cost, and can realize the direct current nonpolar breaking by adding the permanent magnet on the basis of the structure of the existing alternating current miniature circuit breaker, thereby solving the problem of nonpolar breaking of the circuit breaker.

Description

A non-polar arc extinguishing structure with permanent magnet and miniature circuit breaker

technical field

The invention relates to the field of circuit breakers, in particular to a non-polar arc extinguishing structure with permanent magnets and a miniature circuit breaker.

Background technique

DC miniature circuit breakers are important control and protection equipment in low-voltage DC power distribution systems. The DC miniature circuit breakers are internally equipped with dynamic and static contacts. When the circuit breaker breaks the current, the dynamic and static contacts are opened, and arcs and arcs are generated between them. Fast disconnection is required to protect electric shock materials, prevent excessive ablation, and thus protect the safety of electrical equipment.

Direct current is different from alternating current. The former has no natural zero-crossing point, and it is difficult to break. Generally, DC miniature circuit breakers rely on elongating the arc or arc extinguishing grid to increase the arc voltage, forcing the arc current to decrease until the zero-crossing breaking.

Most of the existing DC miniature circuit breakers are polarized, and permanent magnets are often used to provide an external magnetic field to promote the movement, elongation and entry of the DC arc into the arc extinguishing chamber. However, when applied in scenarios such as photovoltaic systems, due to the possibility of facing the need for reverse current breaking, it is necessary to develop non-polar DC miniature circuit breakers. The permanent magnets in the polarized DC circuit breaker are generally placed with N pole to S pole or S pole to N pole. The generated magnetic field is matched with the current direction, and then pushes the arc to move in the direction of the arc extinguishing chamber. If the current direction is reversed, the arc will Moving in the opposite direction of the arc extinguishing chamber will not cause the arc to enter the grid, which will lead to failure of breaking and will also ablate the operating mechanism of the circuit breaker. If the permanent magnet is not used, when the small DC current is interrupted, due to the weak electromagnetic field of the small DC current itself, the effect of the air blowing arc is also small, which will greatly increase the difficulty of breaking the small DC current.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a non-polar arc extinguishing structure with a permanent magnet and a miniature circuit breaker to meet the needs of non-polar DC arc extinguishing in view of the problem that the DC micro-circuit breaker in the prior art needs to realize non-polar breaking.

In order to achieve the above object, the present invention adopts the following technical scheme:

A non-polar arc extinguishing structure with permanent magnets, comprising a moving contact, a static contact, a first permanent magnet, a second permanent magnet, a first arc dividing wall and a second arc dividing wall, the moving contact and the static contact The first permanent magnet and the second permanent magnet are respectively arranged on both sides of the discharge structure, and the first arc dividing wall is arranged between the second permanent magnet and the discharge structure, and can cover the second permanent magnet , the second arc dividing wall is arranged between the first permanent magnet and the discharge structure, and can cover the first permanent magnet.

As a preferred solution, the polarities of the first permanent magnet and the second permanent magnet are opposite, that is, the S pole surface of the first permanent magnet 3 is opposite to the S pole surface of the second permanent magnet 4; or the first permanent magnet 3 The N pole face of the second permanent magnet 4 is opposite to the N pole face of the second permanent magnet 4 .

As a preferred solution, the two ends of the moving contact are respectively the connecting end of the moving contact wire and the discharge end of the moving contact, and the two ends of the static contact are the connecting end of the static contact wire and the discharge end of the static contact respectively The position of the first permanent magnet and the second permanent magnet does not exceed the discharge end of the moving contact and the discharge end of the static contact.

As a preferred solution, the first arc partition wall and the second arc partition wall are made of insulating and high temperature resistant materials.

The insulating and high temperature resistant materials include mass molding compound DMC, nylon plastic PA6, nylon plastic PA66 and ceramics.

The present invention also provides a miniature circuit breaker, which adopts the above-mentioned non-polar arc extinguishing structure with permanent magnets.

In the non-polar arc extinguishing structure with permanent magnets and the miniature circuit breaker provided by the invention, when the miniature circuit breaker breaks the DC arc, the moving contact and the static contact are opened, and an arc is generated between the moving contact and the static contact; If the current flows from the static contact to the moving contact, and the first permanent magnet and the second permanent magnet are close to the moving contact, and the polarity of the static contact is S, the DC arc will be biased to the second permanent magnet under the action of the electric field , the magnetic field of the second permanent magnet will play a major role in the DC arc, promoting the movement of the DC arc to the ends of the moving contact and the static contact; for example, the current flows from the static contact to the moving contact, and the first permanent magnet and the second The polarity of the permanent magnet close to the moving contact and the static contact is N, then the DC arc will be biased towards the first permanent magnet under the action of the electric field, and the magnetic field of the first permanent magnet will play a major role in the DC arc and promote the direction of the DC arc. The ends of the moving contact and the static contact move; if the current automatically flows to the static contact, and the first permanent magnet and the second permanent magnet are close to the moving contact, the polarities of the static contact are S, then the direct current The arc will be biased towards the first permanent magnet under the action of the electric field, and the magnetic field of the first permanent magnet will play a major role in the DC arc, promoting the movement of the DC arc to the ends of the moving contact and the static contact; for example, the current automatic contact flows to the static contact and the polarities of the first permanent magnet and the second permanent magnet close to the moving contact and the static contact are N, then the DC arc will be biased towards the second permanent magnet under the action of the electric field, and the magnetic field of the second permanent magnet will affect the The DC arc plays a major role and promotes the movement of the DC arc to the ends of the moving and static contacts. To sum up, the arc extinguishing structure provided by the present invention can provide a force to promote the movement of the arc to the ends of the movable contact and the static contact for the DC current in any direction.

Compared with the prior art, the present invention has the following beneficial effects: by arranging permanent magnets on both sides of the discharge structure formed by the moving contact and the static Whether the current flows to the moving contact or from the moving contact to the static contact, under the action of a permanent magnet on one side, the DC arc can be promoted to move to the ends of the moving contact and the static contact, thereby realizing arc extinguishing. In the present invention, the discharge structures formed by the first permanent magnet and the second permanent magnet and the movable contact and the static contact are separated by the first arc partition wall and the second arc partition wall, respectively, so as to avoid the movable contact and the static contact. The arc between them ablates the permanent magnets. The present invention has simple structure and low manufacturing cost. On the basis of the existing AC miniature circuit breaker structure, by adding permanent magnets, DC non-polar breaking can be realized, and the problem of non-polar breaking of circuit breakers can be solved.

Description of drawings

In order to more clearly describe the embodiments of the present invention or the solutions in the prior art, the accompanying drawings to be used are briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic front view of an arc-extinguishing structure according to an embodiment of the present invention;

2 is a schematic side view of an arc extinguishing structure according to an embodiment of the present invention;

3 is a schematic diagram of the relative relationship between the first permanent magnet and the S-pole surface of the second permanent magnet according to an embodiment of the present invention;

4 is a schematic diagram of the relative relationship between the first permanent magnet and the N-pole surface of the second permanent magnet according to an embodiment of the present invention;

5 is a schematic diagram of stage 1 of breaking the DC arc from the static contact to the moving contact in Embodiment 1 of the present invention;

6 is a schematic diagram of stage 2 of breaking the DC arc in the direction from the static contact to the moving contact according to Embodiment 1 of the present invention;

7 is a schematic diagram of stage three of breaking the DC arc from the static contact to the moving contact according to Embodiment 1 of the present invention;

8 is a schematic diagram of stage 1 of breaking the DC arc of the automatic contact toward the static contact in Embodiment 1 of the present invention;

Fig. 9 is a schematic diagram of the second stage of breaking the DC arc in the direction of the automatic contact toward the static contact according to Embodiment 1 of the present invention;

Fig. 10 is a schematic diagram of the third stage of breaking the DC arc in the direction of the automatic contact toward the static contact according to Embodiment 1 of the present invention;

11 is a schematic diagram of stage 1 of breaking the DC arc from the static contact to the moving contact in the second embodiment of the present invention;

Fig. 12 is a schematic diagram of the second stage of breaking the DC arc from the static contact to the moving contact in the second embodiment of the present invention;

Fig. 13 is a schematic diagram of the third stage of breaking the DC arc from the static contact to the moving contact in the second embodiment of the present invention;

Fig. 14 is a schematic diagram of stage 1 of breaking the DC arc of the automatic contact towards the static contact according to the second embodiment of the present invention;

15 is a schematic diagram of stage 2 of breaking the DC arc in the direction of the automatic contact toward the static contact according to Embodiment 2 of the present invention;

Fig. 16 is a schematic diagram of the third stage of breaking the DC arc in the direction of the automatic contact toward the static contact according to Embodiment 1 of the present invention;

In the accompanying drawings: 1-moving contact; 2-static contact; 3-first permanent magnet; 4-second permanent magnet; 5-first arc partition wall; 6-second arc partition wall; 1-1. Moving contact wire connection end; 1-2. Moving contact discharge end; 2-1. Static contact wire connection end; 2-2. Static contact discharge end.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, and the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. It should be noted that the embodiments listed in the present invention and the features of the embodiments can be combined with each other under the condition of no conflict. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1 and FIG. 2 , a non-polar arc extinguishing structure with permanent magnets provided by the present invention includes a moving contact 1, a static contact 2, a first permanent magnet 3, a second permanent magnet 4, a first arc isolation The wall 5 and the second arc partition wall 6, the movable contact 1 and the static contact 2 are arranged opposite to each other to form a discharge structure; the first permanent magnet 3 and the second permanent magnet 4 are respectively arranged on both sides of the discharge structure, and the first arc partition The wall 5 is arranged between the second permanent magnet 4 and the discharge structure, and can cover the second permanent magnet 4; the second arc dividing wall 6 is arranged between the first permanent magnet 3 and the discharge structure, and can cover the first permanent magnet 4. Magnet 3 covers. The arc dividing wall is respectively installed between the permanent magnet and the moving contact 1 and the static contact 2 to avoid the ablation of the permanent magnet by the arc between the moving contact 1 and the static contact 2 . The polarities of the first permanent magnet 3 and the second permanent magnet 4 are opposite, that is, the S pole face of the first permanent magnet 3 is opposite to the S pole face of the second permanent magnet 4, or the N pole face of the first permanent magnet 3 is opposite to the S pole face of the second permanent magnet 4. The N pole faces of the second permanent magnet 4 are opposite to each other. The two ends of the moving contact 1 are the moving contact wire connection end 1-1 and the moving contact discharge end 1-2 respectively, and the two ends of the static contact 2 are the static contact wire connection end 2-1 and the static contact respectively. The positions of the discharge end 2-2, the first permanent magnet 3 and the second permanent magnet 4 do not exceed the moving contact discharge end 1-2 and the static contact discharge end 2-2.

The first arc dividing wall 5 and the second arc dividing wall 6 are made of insulating and high temperature resistant materials.

Referring to FIG. 3, in an embodiment of the present invention, the S pole face of the first permanent magnet 3 is opposite to the S pole face of the second permanent magnet 4; Referring to FIG. 4, in another embodiment of the present invention, The N-pole surface of the first permanent magnet 3 is opposite to the N-pole surface of the second permanent magnet 4 . By using the non-polar miniature circuit breaker with permanent magnet and its arc extinguishing structure provided by the present invention, when the miniature circuit breaker breaks the DC arc, the moving contact 1 and the static contact 2 are opened, and the moving contact 1 and the static contact are opened. An arc occurs between 2.

Example 1

When the miniature circuit breaker of the present invention breaks the DC current flowing from the static contact 2 to the moving contact 1, the moving contact 1 and the static contact 2 are opened, and an arc is generated between the moving contact 1 and the static contact 2, As shown in FIG. 5 , the polarities of the first permanent magnet 3 and the second permanent magnet 4 close to the movable contact 1 and the static contact 2 are both S, and the DC arc will be biased towards the second permanent magnet 4 under the action of the electric field, such as As shown in Figure 6; then the magnetic field of the second permanent magnet 4 will play a major role in the DC arc, promoting the movement of the DC arc to the ends of the moving contact 1 and the static contact 2, as shown in Figure 7; When the miniature circuit breaker breaks the DC current flowing from the automatic contact 1 to the static contact 2, the moving contact 1 and the static contact 2 are opened, and an arc is generated between the moving contact 1 and the static contact 2, as shown in Figure 8 , the polarities of the first permanent magnet 3 and the second permanent magnet 4 close to the moving contact 1 and the static contact 2 are both S, and the DC arc will be biased towards the first permanent magnet 3 under the action of the electric field, as shown in Figure 9, Then the magnetic field of the first permanent magnet 3 will play a major role in the DC arc, promoting the movement of the DC arc to the ends of the moving contact 1 and the static contact 2, as shown in FIG. 10 .

Example 2

When the miniature circuit breaker of the present invention breaks the DC current flowing from the static contact 2 to the moving contact 1, the moving contact 1 and the static contact 2 are opened, and an arc is generated between the moving contact 1 and the static contact 2, As shown in FIG. 11 , the polarities of the first permanent magnet 3 and the second permanent magnet 4 close to the movable contact 1 and the static contact 2 are both N, and the DC arc will be biased towards the first permanent magnet 3 under the action of the electric field, such as As shown in Figure 12, the magnetic field of the first permanent magnet 3 will play a major role in the DC arc, and promote the DC arc to move to the ends of the moving contact 1 and the static contact 2, as shown in Figure 13; When the circuit breaker breaks the DC current flowing from the automatic contact 1 to the static contact 2, the moving contact 1 and the static contact 2 are opened, and an arc is generated between the moving contact 1 and the static contact 2, as shown in Figure 14, The polarities of the first permanent magnet 3 and the second permanent magnet 4 close to the moving contact 1 and the static contact 2 are both N, and the DC arc will be biased towards the second permanent magnet 4 under the action of the electric field, as shown in FIG. 15 , then The magnetic field of the second permanent magnet 4 will play a major role in the DC arc, and promote the movement of the DC arc to the ends of the moving contact 1 and the static contact 2, as shown in FIG. 16 .

To sum up, the arc extinguishing structure provided by the present invention can provide the force that promotes the movement of the arc to the ends of the moving contact 1 and the static contact 2 for the DC current in any direction, and solves the problem of non-polar breaking of the miniature circuit breaker. question. The present invention has simple structure and low manufacturing cost, and can be realized by adding permanent magnets on the basis of the existing AC miniature circuit breaker structure.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solutions also Several simple modifications and substitutions can be made, and these modifications and substitutions also fall within the protection scope covered by the claims.

Claims (6)

1. The utility model provides a take non-polar arc extinguishing structure of permanent magnet which characterized in that: including moving contact (1), static contact (2), first permanent magnet (3), second permanent magnet (4), first flash barrier (5) and second flash barrier (6), moving contact (1) sets up with static contact (2) relatively, become the structure of discharging, first permanent magnet (3), second permanent magnet (4) set up respectively in the both sides of discharging the structure, first flash barrier (5) set up between second permanent magnet (4) and the structure of discharging, and can cover second permanent magnet (4), second flash barrier (6) set up between first permanent magnet (3) and the structure of discharging, and can cover first permanent magnet (3).

2. The non-polar arc extinguishing structure with permanent magnet according to claim 1, characterized in that:

the S pole surface of the first permanent magnet (3) is opposite to the S pole surface of the second permanent magnet (4);

or the N pole surface of the first permanent magnet (3) is opposite to the N pole surface of the second permanent magnet (4).

3. The non-polar arc extinguishing structure with permanent magnet according to claim 1, characterized in that:

two ends of the moving contact (1) are respectively a moving contact wire connecting end (1-1) and a moving contact discharging end (1-2), two ends of the static contact (2) are respectively a static contact wire connecting end (2-1) and a static contact discharging end (2-2), and the positions of the first permanent magnet (3) and the second permanent magnet (4) are not more than the moving contact discharging end (1-2) and the static contact discharging end (2-2).

4. The non-polar arc extinguishing structure with permanent magnet according to claim 1, characterized in that: the first arc isolating wall (5) and the second arc isolating wall (6) are made of insulating high-temperature-resistant materials.

5. The non-polar arc extinguishing structure with the permanent magnet according to claim 4, characterized in that: the insulating high-temperature-resistant material comprises bulk molding plastic DMC, nylon plastic PA6, nylon plastic PA66 and ceramic.

6. A miniature circuit breaker, characterized in that: the arc extinguishing structure adopts the nonpolar arc extinguishing structure with the permanent magnet according to any one of claims 1 to 5.

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