Rapid breaking arc extinguishing structure of circuit breaker

Abstract

The utility model belongs to the technical field of circuit breakers, and discloses a fast breaking arc extinguishing structure of a circuit breaker, which comprises a moving contact, a static contact and an arc extinguishing chamber, the arc extinguishing chamber is positioned on one side of a contact position of the moving contact and the static contact, and a port of the arc extinguishing chamber is provided with a first arc striking sheet, a second arc striking sheet and two magnetizers. The two magnetizers are arranged on the two sides of the first arc striking piece and the two sides of the second arc striking piece respectively, the first arc striking piece, the second arc striking piece and the two magnetizers define a magnetic conduction loop, the magnetic conduction loop generates an annular magnetic field when the moving contact and the static contact are disconnected, and the electromagnetic force of the annular magnetic field lengthens the electric arc and blows the electric arc into the arc extinguish chamber. According to the rapid breaking arc extinguishing structure of the circuit breaker, the magnetic conduction loop defined by the first arc striking sheet, the second arc striking sheet and the two magnetizers is designed, a magnetic field generated by the magnetic conduction loop when the circuit breaker is broken is used for blowing electric arcs into the arc extinguishing chamber, the magnetic blow-out effect is achieved, the arc striking and arc extinguishing capacity of the arc extinguishing chamber is further enhanced, and the arc extinguishing effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a quick-breaking arc extinguishing structure for a circuit breaker. Background Art

[0002] As Figure 1 shown in the figure, it is a traditional arc extinguishing structure of a circuit breaker, which includes a moving contact 1', a static contact 2', and an arc extinguishing chamber 3' located on one side of the contact position between the moving contact 1' and the static contact 2'. An arc guiding piece 4' extending towards the inside of the arc extinguishing chamber 3' is arranged at the port of the arc extinguishing chamber 3', and arc extinguishing grid pieces 5' are arranged inside the arc extinguishing chamber 3'. When the moving contact 1' and the static contact 2' are opened, the arc ( Figure 1 shown by the dotted line in the figure) enters the inside of the arc extinguishing chamber 3' through the arc guiding piece 4', and is extinguished after being elongated and the voltage is reduced by the arc extinguishing grid pieces 5'.

[0003] The traditional arc extinguishing structure of a circuit breaker is mainly applicable to the breaking of alternating current. Due to the characteristic of the alternating current having a zero-crossing point, the breaking situation of the current is relatively simple, and its arc extinguishing structure is also relatively simple; however, this structure has poor breaking performance for high-voltage direct current, and there will be a situation where part of the current cannot be cut off within the specified time, affecting the reliability of the circuit breaker. Therefore, it is necessary to optimize and improve the arc extinguishing structure. Content of the Utility Model

[0004] Based on the above problems, the purpose of the utility model is to provide a quick-breaking arc extinguishing structure for a circuit breaker, so that the circuit breaker can still effectively elongate, cut off, and extinguish the arc in the environment of direct current with high voltage, and improve the arc extinguishing ability of the circuit breaker.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A quick-breaking arc extinguishing structure for a circuit breaker, which includes a moving contact, a static contact, and an arc extinguishing chamber. The arc extinguishing chamber is located on one side of the contact position between the moving contact and the static contact. A first arc guiding piece, a second arc guiding piece, and two magnetic conductors are arranged at the port of the arc extinguishing chamber, wherein:

[0007] The first arc guiding piece extends from the moving contact towards the inside of the arc extinguishing chamber, and is used for introducing the arc on the moving contact into the arc extinguishing chamber when the moving contact and the static contact are opened;

[0008] The second arc guiding piece extends from the static contact towards the inside of the arc extinguishing chamber, and is arranged oppositely to the first arc guiding piece, and is used for introducing the arc on the static contact into the arc extinguishing chamber when the moving contact and the static contact are opened;

[0009] The two magnetic conductors are respectively arranged on both sides of the first arc guiding piece and the second arc guiding piece. The first arc guiding piece, the second arc guiding piece, and the two magnetic conductors form a magnetic conduction loop. The magnetic conduction loop generates a circular magnetic field when the moving contact and the static contact are opened, and the electromagnetic force of the circular magnetic field elongates and blows the arc into the arc extinguishing chamber.

[0010] As an alternative, the surface of the magnetic conductor is wrapped with an insulating gas-generating sheath, which is used to prevent the magnetic conductor from being energized and causing a short circuit between the moving contact and the static contact, and generates a gas that helps to blow the arc into the arc extinguishing chamber under the action of the high temperature of the arc.

[0011] As an alternative, the arc extinguishing chamber includes two side plates arranged oppositely at intervals. The first arc guiding piece and the second arc guiding piece are distributed at both ends of the area between the two side plates, and two magnetic conductors are respectively mounted on the two side plates.

[0012] As an alternative, the magnetic conductor abuts against the inner surface of the side plate, the insulating gas-generating sheath covers the magnetic conductor, and an installation groove is formed on the insulating gas-generating sheath. A positioning post is arranged in the installation groove, the magnetic conductor is embedded in the installation groove, and the positioning post sequentially passes through the magnetic conductor and the side plate.

[0013] As an alternative, the ends of the first arc guiding piece and the second arc guiding piece respectively extend to the side plates, and notches for avoiding the insulating gas-generating sheath are arranged at the ends of the first arc guiding piece and the second arc guiding piece. The notches limit the insulating gas-generating sheath to prevent the positioning post from disengaging from the side plate.

[0014] As an alternative, a plurality of arc extinguishing grid pieces arranged at intervals are arranged in the arc extinguishing chamber. The two sides of each arc extinguishing grid piece are correspondingly clamped with the two side plates, and an arc cutting groove is arranged on each arc extinguishing grid piece. The arc cutting grooves of adjacent arc extinguishing grid pieces are distributed in a staggered manner.

[0015] As an alternative, the port of the arc extinguishing chamber is located at the bottom ends of the two side plates, and a cover plate is further arranged at the top ends of the two side plates. An arc extinguishing piece is arranged on the cover plate.

[0016] As an alternative, a plurality of arc extinguishing pieces are arranged, and the plurality of arc extinguishing pieces are arranged in a stacked manner up and down, and a support rod is clamped between adjacent arc extinguishing pieces.

[0017] As an alternative, through holes are scattered on each arc extinguishing piece, and the through holes of adjacent arc extinguishing pieces are distributed in a staggered manner.

[0018] As an alternative, through holes are scattered on each arc extinguishing piece, and the diameters of the through holes of the arc extinguishing pieces from bottom to top decrease in sequence.

[0019] The beneficial effects of the present utility model: The fast-breaking arc extinguishing structure of the circuit breaker designs a magnetic conduction loop formed by the first arc guiding piece, the second arc guiding piece and two magnetic conductors for the arc generated between the moving contact and the static contact after the circuit breaker is broken. The magnetic field generated by the magnetic conduction loop during the breaking of the circuit breaker is used to blow the arc into the arc extinguishing chamber, achieving the effect of magnetic blowing, thereby strengthening the arc guiding and arc extinguishing capabilities of the arc extinguishing chamber and ensuring the arc extinguishing effect. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the arc extinguishing structure of an existing traditional circuit breaker;

[0021] Figure 2 It is a schematic diagram of the internal structure of the arc extinguishing structure for rapid opening and breaking of a circuit breaker provided by an embodiment of the present invention;

[0022] Figure 3 It is a sectional view of the arc extinguishing structure for rapid opening and breaking of a circuit breaker provided by an embodiment of the present invention;

[0023] Figure 4 It is a sectional view of the arc extinguishing chamber in the arc extinguishing structure for rapid opening and breaking of a circuit breaker provided by an embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of the magnetic conduction loop in the arc extinguishing structure for rapid opening and breaking of a circuit breaker provided by an embodiment of the present invention;

[0025] Figure 6 It is a combined schematic diagram of the first arc guiding piece, the second arc guiding piece and two magnetic conductors in the arc extinguishing structure for rapid opening and breaking of a circuit breaker provided by an embodiment of the present invention.

[0026] In the drawings:

[0027] 1', moving contact; 2', static contact; 3', arc extinguishing chamber; 4', arc guiding piece; 5', arc extinguishing grid piece;

[0028] 1, moving contact; 2, static contact; 3, arc extinguishing chamber; 4, first arc guiding piece; 5, second arc guiding piece; 6, magnetic conductor; 7, insulating gas generating sheath; 8, side plate; 9, installation groove; 10, positioning post; 11, notch; 12, arc extinguishing grid piece; 13, arc cutting groove; 14, cover plate; 15, flame extinguishing piece; 16, support rod; 17, through hole. Detailed implementation manners

[0029] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that only the parts related to the present invention rather than all the structures are shown in the drawings for the convenience of description.

[0030] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0031] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0032] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left" and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0033] Please refer to Figures 2 to 6 As shown, this preferred embodiment provides a quick-break arc extinguishing structure for a circuit breaker, which includes a moving contact 1, a static contact 2 and an arc extinguishing chamber 3. The arc extinguishing chamber 3 is located on one side of the contact position between the moving contact 1 and the static contact 2. The ports of the arc extinguishing chamber 3 are provided with a first arc guiding piece 4, a second arc guiding piece 5 and two magnetic conductors 6, wherein:

[0034] The first arc guiding piece 4 extends from the moving contact 1 into the interior of the arc extinguishing chamber 3, and is used for introducing the arc on the moving contact 1 into the arc extinguishing chamber 3 when the moving contact 1 and the static contact 2 are disconnected;

[0035] The second arc guiding piece 5 extends from the static contact 2 into the interior of the arc extinguishing chamber 3 and is oppositely arranged with the first arc guiding piece 4, and is used for introducing the arc on the static contact 2 into the arc extinguishing chamber 3 when the moving contact 1 and the static contact 2 are disconnected;

[0036] The two magnetic conductors 6 are respectively arranged on both sides of the first arc guiding piece 4 and the second arc guiding piece 5. The first arc guiding piece 4, the second arc guiding piece 5 and the two magnetic conductors 6 form a magnetic conduction loop. The magnetic conduction loop generates a circular magnetic field when the moving contact 1 and the static contact 2 are disconnected, and the electromagnetic force of the circular magnetic field stretches and blows the arc into the arc extinguishing chamber 3.

[0037] Therefore, a magnetic conduction loop formed by the first arc guiding piece 4, the second arc guiding piece 5 and the two magnetic conductors 6 is designed for the arc generated between the moving contact 1 and the static contact 2 after the circuit breaker is disconnected. The magnetic field generated by the magnetic conduction loop when the circuit breaker is disconnected is used to blow the arc into the arc extinguishing chamber 3, achieving the effect of magnetic blowing, thereby strengthening the arc guiding and arc extinguishing capabilities of the arc extinguishing chamber 3 and ensuring the arc extinguishing effect.

[0038] Furthermore, the surface of the magnetic conductor 6 is wrapped with an insulating gas-generating sheath 7, which is used to prevent the magnetic conductor 6 from being energized and causing a short circuit between the moving contact 1 and the static contact 2, and generates gas that helps blow the arc into the arc extinguishing chamber 3 under the action of the high temperature of the arc, achieving the effect of gas blowing.

[0039] Preferably, the insulating gas-generating sheath 7 is made of materials such as PA66, POM, PMMA, and PE. It not only has the insulating function to prevent the direct connection and short circuit between the moving contact 1 and the static contact 2, but also can generate more gas at high temperatures, increasing the air pressure at the port of the arc extinguishing chamber 3 and better blowing the arc into the arc extinguishing chamber 3, further improving the arc extinguishing ability of the circuit breaker.

[0040] Specifically, the arc extinguishing chamber 3 includes two side plates 8 arranged oppositely at intervals. The first arc guiding piece 4 and the second arc guiding piece 5 are distributed at both ends of the area between the two side plates 8. Two magnetic conductors 6 are respectively installed on the two side plates 8 to form a rectangular magnetic guiding loop, as shown in Figure 5 and Figure 6 , Figure 5 The dotted lines in which represent the circular magnetic field.

[0041] Optionally, the magnetic conductor 6 abuts against the inner surface of the side plate 8, the insulating gas-generating sheath 7 covers the magnetic conductor 6, and an installation groove 9 is provided on the insulating gas-generating sheath 7. A positioning post 10 is arranged in the installation groove 9, and the magnetic conductor 6 is embedded in the installation groove 9. The positioning post 10 passes through the magnetic conductor 6 and the side plate 8 in sequence, thereby stably installing the magnetic conductor 6 on the side plate 8.

[0042] Furthermore, the ends of the first arc guiding piece 4 and the second arc guiding piece 5 respectively extend to the side plate 8, and notches 11 for avoiding the insulating gas-generating sheath 7 are provided at the ends of the first arc guiding piece 4 and the second arc guiding piece 5. The notches 11 limit the insulating gas-generating sheath 7 to prevent the positioning post 10 from disengaging from the side plate 8. Relying on the first arc guiding piece 4 and the second arc guiding piece 5 to limit the insulating gas-generating sheath 7 ensures the stable positions of the magnetic conductor 6 and the insulating gas-generating sheath 7 without additional fasteners, facilitating installation.

[0043] Optionally, a number of arc extinguishing grid pieces 12 arranged at intervals are provided in the arc extinguishing chamber 3. The two sides of each arc extinguishing grid piece 12 are correspondingly clamped with the two side plates 8. Each arc extinguishing grid piece 12 is provided with an arc cutting groove 13, and the arc cutting grooves 13 of adjacent arc extinguishing grid pieces 12 are distributed in a staggered manner to effectively cut off and extinguish the arc generated when the moving contact 1 and the static contact 2 are disconnected.

[0044] Optionally, the ports of the arc extinguishing chamber 3 are located at the bottom ends of the two side plates 8, and a cover plate 14 is further provided at the top ends of the two side plates 8. A flame extinguishing piece 15 is provided on the cover plate 14. There are multiple flame extinguishing pieces 15, and the multiple flame extinguishing pieces 15 are arranged in a stacked manner up and down, and a support rod 16 is clamped between adjacent flame extinguishing pieces 15. The multiple layers of flame extinguishing pieces 15 can accelerate the extinction of the arc and prevent the arc from reigniting, effectively blocking the flying out of metal particles and impurities, while ensuring the smooth flow of air, ensuring the arc extinguishing performance of the arc extinguishing chamber 3, and achieving zero arc flash.

[0045] Further, through holes 17 are scattered on each flame extinguishing piece 15, and the through holes 17 of adjacent flame extinguishing pieces 15 are arranged in a staggered manner, which is beneficial to the extinction of the arc, improves the breaking capacity of the circuit breaker, and reduces the return of metal particles generated by the cooling of the arc to the arc extinguishing chamber 3.

[0046] Further, the diameters of the through holes 17 of the flame extinguishing pieces 15 from bottom to top decrease in sequence, so that the arc can be in full contact with the flame extinguishing pieces 15, which is beneficial to the extinction of the arc in the arc extinguishing chamber 3 and reduces the influence on the external environment of the arc extinguishing chamber 3 after the arc is extinguished.

[0047] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A circuit breaker quick breaking arc extinguishing structure, comprising a moving contact (1), a stationary contact (2) and an arc extinguishing chamber (3), wherein the arc extinguishing chamber (3) is located on one side of the contact position between the moving contact (1) and the stationary contact (2), and is characterized in that: The port of the arc extinguishing chamber (3) is provided with a first arc striking piece (4), a second arc striking piece (5) and two magnetic conductors (6). The first arc-starting piece (4) extends from the moving contact (1) to the inside of the arc-extinguishing chamber (3) and is used to introduce the arc on the moving contact (1) into the arc-extinguishing chamber (3) when the moving contact (1) and the stationary contact (2) are disconnected; The second arc-striking piece (5) extends from the stationary contact (2) to the inside of the arc-extinguishing chamber (3), and is arranged opposite to the first arc-striking piece (4), and is used to guide the arc on the stationary contact (2) into the arc-extinguishing chamber (3) when the moving contact (1) and the stationary contact (2) are disconnected; The two magnetic conductors (6) are respectively arranged on both sides of the first arc-striking piece (4) and the second arc-striking piece (5); the first arc-striking piece (4), the second arc-striking piece (5) and the two magnetic conductors (6) form a magnetic conductive loop; the magnetic conductive loop generates an annular magnetic field when the moving contact (1) and the static contact (2) are disconnected; the electromagnetic force of the annular magnetic field stretches the arc and blows it into the arc extinguishing chamber (3).

2. The circuit breaker rapid breaking arc extinguishing structure according to claim 1, characterized in that: The surface of the magnetic conductor (6) is wrapped with an insulating gas-generating sheath (7), and the insulating gas-generating sheath (7) is used to prevent the magnetic conductor (6) from being connected to current and causing a short circuit between the moving contact (1) and the static contact (2), and to generate gas under the high temperature of the arc to help blow the arc into the arc extinguishing chamber (3).

3. The circuit breaker rapid breaking arc extinguishing structure according to claim 2, characterized in that: The arc extinguishing chamber (3) comprises two side plates (8) arranged in an interval and opposite to each other, the first arc-striking plate (4) and the second arc-striking plate (5) are distributed at two end positions of the area between the two side plates (8), and the two magnetic conductors (6) are mounted on the two side plates (8) in a one-to-one correspondence.

4. The circuit breaker rapid breaking arc extinguishing structure according to claim 3, characterized in that: The magnetizer (6) is attached to the inner surface of the side plate (8), the insulating gas-generating sheath (7) covers the magnetizer (6), and the insulating gas-generating sheath (7) is provided with a mounting groove (9), a positioning column (10) is provided in the mounting groove (9), the magnetizer (6) is embedded in the mounting groove (9), and the positioning column (10) passes through the magnetizer (6) and the side plate (8) in sequence.

5. The circuit breaker rapid breaking arc extinguishing structure according to claim 4, characterized in that: The end of the first arc-striking piece (4) and the end of the second arc-striking piece (5) extend to the side plate (8) respectively, and the end of the first arc-striking piece (4) and the end of the second arc-striking piece (5) are provided with a notch (11) for avoiding the insulating gas-generating sheath (7), and the notch (11) forms a limit for the insulating gas-generating sheath (7) to prevent the positioning column (10) from falling out of the side plate (8).

6. The circuit breaker rapid breaking arc extinguishing structure according to claim 3, characterized in that: A plurality of arc extinguishing grids (12) arranged at intervals are arranged in the arc extinguishing chamber (3), two sides of the arc extinguishing grid (12) are correspondingly clamped with the two side plates (8), each arc extinguishing grid (12) is provided with an arc cutting groove (13), and the arc cutting grooves (13) of adjacent arc extinguishing grids (12) are staggered.

7. The circuit breaker rapid breaking arc extinguishing structure according to claim 3, characterized in that: The port of the arc extinguishing chamber (3) is located at the bottom ends of the two side plates (8), and the top ends of the two side plates (8) are also provided with a cover plate (14), and the cover plate (14) is provided with a flame extinguishing plate (15).

8. The circuit breaker rapid breaking arc extinguishing structure according to claim 7, characterized in that: A plurality of the flame extinguishing plates (15) are provided, and the plurality of the flame extinguishing plates (15) are stacked and arranged up and down, and a support rod (16) is sandwiched between adjacent flame extinguishing plates (15).

9. The circuit breaker rapid breaking arc extinguishing structure according to claim 8, characterized in that: Through holes (17) are distributed on each of the flame extinguishing plates (15), and the through holes (17) of adjacent flame extinguishing plates (15) are staggered.

10. The circuit breaker rapid breaking arc extinguishing structure according to claim 8, characterized in that: Through holes (17) are distributed on each of the flame extinguishing plates (15), and the apertures of the through holes (17) of the flame extinguishing plates (15) decrease from bottom to top.

Images