Polarity-free integrated control interrupter for DC molded case circuit breakers

Abstract

The present invention discloses a non-polarity comprehensive control arc extinguishing chamber for a DC molded case circuit breaker, comprising two arc-isolating plates arranged vertically in parallel, with multiple rows of riveted square holes arranged at intervals on the arc-isolating plates, multiple arc-extinguishing grids located between the two arc-isolating plates, inserted into the riveted square holes and fixed by riveting; two gas-producing sub-plates located between the multiple arc-extinguishing grids, respectively riveted to the two arc-isolating plates after passing through the gaps between the arc-extinguishing grids; the two gas-producing sub-plates are also provided with card slots, and permanent magnets are coated in the card slots. The arc-extinguishing chamber structure proposed by the present invention adopts a comprehensive control scheme of air blowing and magnetic blowing, which can quickly extinguish the arc regardless of whether the product breaks the short-circuit current or the critical current, thereby improving the electrical life and breaking capacity of the product. Moreover, through the reasonable arrangement of the permanent magnets, the product is non-polar, and the product performance will not be affected regardless of whether the wiring is positive or reverse.

Description

Technical Field

[0001] The invention belongs to the technical field of low-voltage direct current circuit breakers and relates to a non-polarity comprehensive control arc extinguishing chamber for a direct current molded case circuit breaker. Background Art

[0002] With the gradual development of the photovoltaic and wind power generation industries, the demand for DC circuit breakers in photovoltaic and wind power is increasing, and the voltage on the DC side of the system is increasing, and is developing towards DC1500V. Therefore, the performance requirements for DC circuit breakers are getting higher and higher. The short-circuit current of DC circuit breakers is smaller than that of AC circuit breakers, so the Lorentz magnetic force generated is small. It is difficult to quickly introduce the arc into the arc extinguishing chamber for arc extinguishing by relying on traditional single air blowing or magnetic blowing. In addition, since DC current has no natural zero crossing point, it is difficult for DC molded case circuit breakers to break DC short-circuit current, especially high-voltage DC short-circuit current. Therefore, existing circuit breakers often use permanent magnets to provide an external magnetic field to make the arc elongate and quickly enter the arc extinguishing chamber. However, in application scenarios such as photovoltaic and wind power, DC circuit breakers will face the interruption of reverse DC current. When the DC circuit breaker has polarity and the current is reversed, the arc will be pulled out of the arc extinguishing chamber by the Lorentz magnetic force generated by the permanent magnet, and the arc cannot be prompted to enter the grid, and it cannot be broken, causing the harm of burning the operating mechanism of the circuit breaker.

[0003] The existing DC molded case circuit breakers have a small Lorentz magnetic force when breaking a critical small current, and the arc cannot be extinguished in time. At this time, the product contacts are severely eroded, which seriously reduces the electrical life of the product. DC molded case circuit breakers use permanent magnets, which cause the product to have polarity. If the current is reversed, the circuit breaker cannot be disconnected. Summary of the invention

[0004] The purpose of the present invention is to provide a non-polarity comprehensive control arc extinguishing chamber for a DC molded case circuit breaker, which adopts comprehensive control of air blowing and magnetic blowing, which not only enhances the air blowing effect, but also enhances the magnetic blowing effect on the arc, prompting the arc to quickly enter the grid area, enhances the arc energy dissipation, and thus achieves the characteristic of quickly extinguishing the arc.

[0005] The technical solution adopted by the present invention is a non-polarity comprehensive control arc extinguishing chamber for a DC molded case circuit breaker, comprising two arc-isolating plates arranged vertically in parallel, with multiple rows of riveted square holes arranged at intervals on the arc-isolating plates, multiple arc-extinguishing grids are located between the two arc-isolating plates, and are inserted into the riveted square holes and riveted to be fixed; two gas-producing sub-plates are located between the multiple arc-extinguishing grids, and are riveted to the two arc-isolating plates respectively after passing through the gaps between the arc-extinguishing grids; the two gas-producing sub-plates are also provided with slots, and permanent magnets are coated in the slots.

[0006] The permanent magnet is covered with a magnet sleeve.

[0007] The arc-extinguishing grid is a U-shaped structure, with protrusions inserted into riveted square holes on the outside of the legs on both sides, and a protruding trapezoidal platform at the root; a notch is opened on the side of the arc-extinguishing grid close to the leg, with a notch depth of 3-6mm and a width of 2-5mm.

[0008] The arc-extinguishing grids are arranged alternately from top to bottom, and the notches are evenly distributed on both sides of the central axis of the arc-extinguishing grids to form two gas flow channels; the top and bottom arc-extinguishing grids are both provided with arc-strike angles, and their thickness is 2.5-3mm.

[0009] The side of the gas-producing sub-plate in contact with the arc-isolating plate is horizontally provided with multiple rows of grooves for accommodating arc-extinguishing grids, and the middle part is a vertical permanent magnet-covered slot; the side of the gas-producing sub-plate away from the arc-isolating plate is an outwardly convex arc, that is, the arc-extinguishing grid is contracted at the legs and expanded at the roots.

[0010] The arc isolation plate is also provided with a spacing circular hole, and the gas production sub-plate is provided with a spacing cylindrical protrusion, which is inserted into the spacing circular hole and then riveted to the arc isolation plate.

[0011] The gas generating sub-plate is prepared by a gas generating material, which is polyamide containing 30% glass fiber.

[0012] The permanent magnets in the arc extinguishing chamber are arranged with N poles facing each other or S poles facing each other.

[0013] When the arc extinguishing chambers are arranged in series with multiple poles, the permanent magnets of two adjacent arc extinguishing chambers have the same poles facing each other.

[0014] The beneficial effects of the present invention are:

[0015] 1) The arc extinguishing chamber structure proposed in the present invention adopts a comprehensive control scheme of air blowing and magnetic blowing, which can quickly extinguish the arc regardless of whether the product breaks short-circuit current or critical current, thereby improving the product's electrical life and breaking capacity. In addition, through the reasonable arrangement of permanent magnets, the product has no polarity, and whether the wiring is positive or reverse, it will not affect the product performance.

[0016] 2) The two gas-producing sub-plates of the arc-extinguishing chamber structure are placed symmetrically, and the gas-producing sub-plates are arc-shaped, thus forming a nozzle structure. The arc-extinguishing grids are arranged in parallel and staggered from bottom to top, which is conducive to the arc being quickly cut by the grids. The two permanent magnets are placed with their N poles facing each other or their S poles facing each other to achieve non-polarity. Gas-producing sub-plates are placed on both sides of the arc-extinguishing chamber, and the permanent magnets are wrapped by the gas-producing sub-plates to avoid direct contact with the high-temperature arc and prevent the permanent magnets from demagnetizing. At the same time, the gas-producing sub-plates decompose and release steam at high temperatures, which can increase the pressure in the arc-extinguishing chamber.

[0017] 3) With the above structural design, when interrupting the critical small DC current, due to the effect of the permanent magnet, the arc is subjected to a larger Lorentz magnetic force. On the one hand, the Lorentz magnetic force on the arc is increased, accelerating the arc movement; on the other hand, the convection flux is enhanced, promoting efficient energy dissipation. When interrupting the short-circuit current, the gas-producing sub-plate will release a large amount of gas, increasing the pressure gradient between the inside of the arc extinguishing chamber and the gas outlet. At the same time, the gas is a high thermal conductivity gas, which accelerates the cooling of the arc and increases the arc voltage. Finally, by the relative arrangement of the N pole or S pole of the permanent magnet, the influence of the polarity of the DC current is eliminated, and DC non-polarity interruption is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the non-polarity comprehensive control arc extinguishing chamber used for DC molded case circuit breaker of the present invention;

[0019] Figure 2 It is a position relationship diagram of arc extinguishing grid, gas-generating auxiliary plate and permanent magnet in the non-polarity comprehensive control arc extinguishing chamber of DC molded case circuit breaker used in the present invention;

[0020] Figure 3 It is a three-dimensional structural diagram of the arc extinguishing grid in the non-polarity comprehensive control arc extinguishing chamber of the DC molded case circuit breaker of the present invention;

[0021] Figure 4 It is a structural diagram of an arc extinguishing grid in a non-polarity comprehensive control arc extinguishing chamber of a DC molded case circuit breaker according to the present invention;

[0022] Figure 5 This is a structural diagram of a gas-generating sub-board in a non-polarity comprehensive control arc-extinguishing chamber of a DC molded case circuit breaker according to the present invention;

[0023] Figure 6 This is a position relationship diagram of the arc extinguishing grid and the permanent magnet in the non-polarity comprehensive control arc extinguishing chamber of the DC molded case circuit breaker of the present invention;

[0024] Figure 7 This is a relative arrangement scheme of N poles for realizing non-polarity of permanent magnets in the non-polarity comprehensive control arc extinguishing chamber of a DC molded case circuit breaker according to the present invention. In the figure, (a) is when the current direction is perpendicular to the paper plane and inward, and (b) is when the current direction is perpendicular to the paper plane and outward;

[0025] Figure 8 This is a relative arrangement scheme of S poles for realizing non-polarity of permanent magnets in the non-polarity comprehensive control arc extinguishing chamber of a DC molded case circuit breaker according to the present invention. In the figure, (a) is when the current direction is perpendicular to the paper plane and inward, and (b) is when the current direction is perpendicular to the paper plane and outward;

[0026] Fig. 9It is a comparison diagram of the simulation results of the arrangement of the gas-producing sub-plate in the arc-extinguishing grid in the non-polarity comprehensive control arc-extinguishing chamber of the DC molded case circuit breaker of the present invention and the simulation results of the traditional arrangement, in which (a) is the arrangement of the gas-producing sub-plate of the present invention, and (b) is the arrangement of the traditional gas-producing sub-plate;

[0027] Fig.10 This is a diagram of the permanent magnet arrangement scheme when two poles are connected in series in the non-polarity comprehensive control arc extinguishing chamber of the DC molded case circuit breaker of the present invention. In the figure, (a) shows that both arc extinguishing chambers have two N poles facing each other, and (b) shows that both arc extinguishing chambers have two S poles facing each other.

[0028] In the figure: 1. Arc extinguishing grid, 2. Arc isolation plate, 3. Gas production sub-plate, 4. Magnet sleeve, 5. Permanent magnet DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 , Figure 2 and Figure 6 As shown, a non-polarity comprehensive control arc extinguishing chamber for a DC molded case circuit breaker includes two arc isolation plates 2 arranged vertically in parallel, with multiple rows of riveted square holes arranged at intervals on the arc isolation plates 2, multiple arc extinguishing grids 1 are located between the two arc isolation plates 2, and are inserted into the riveted square holes and fixed by riveting; two gas-producing sub-plates 3 are located between the multiple arc extinguishing grids 1, and are riveted to the two arc isolation plates 2 after passing through the gaps between the arc extinguishing grids 1; the two gas-producing sub-plates 3 are also provided with slots, and the slots are covered with permanent magnets 5.

[0031] The permanent magnet 5 is covered with a magnet cover 4, and the gas-generating sub-plate 3 is made of a gas-generating material, specifically PA66 (30% glass fiber).

[0032] like Figure 3-4 As shown, for the arc-extinguishing grid 1, the left side of the dotted line is the root of the grid, and the right side of the dotted line is the leg of the grid. In this example, it is composed of 21 arc-extinguishing grids 1. The arc-extinguishing grid 1 is a U-shaped structure, and the outer sides of the legs on both sides have protrusions inserted into the riveted square holes, and the root has a convex trapezoidal platform; the arc-extinguishing grid 1 has a notch on the side close to the leg, and the notch depth is 3-6mm and the width is 2-5mm.

[0033] The arc extinguishing grids 1 are arranged alternately from top to bottom, and the notches are evenly distributed on both sides of the central axis of the arc extinguishing grids 1 to form two gas flow channels; the top and bottom arc extinguishing grids 1 both have arc striking angles, and their thickness is 2.5-3mm, and the thickness of the remaining grids is 1.5-2mm.

[0034] like Figure 5As shown, the side of the gas-producing sub-plate 3 in contact with the arc-isolating plate 2 is horizontally provided with multiple rows of grooves for accommodating the arc-extinguishing grid 1, and the middle part is a vertical permanent magnet 5 covering slot; the side of the gas-producing sub-plate 3 away from the arc-isolating plate 2 is an outwardly convex arc, that is, the arc-extinguishing grid 1 is contracted at the leg and expanded at the root; in this way, the two gas-producing sub-plates 3 are symmetrically placed to form a nozzle structure, thereby accelerating the airflow field and promoting the arc to quickly enter the arc-extinguishing grid 1 area. The gas-producing sub-plate 3 covers the permanent magnet 5 to prevent it from directly contacting the high-temperature arc and preventing the permanent magnet 5 from demagnetizing. At the same time, the gas-producing sub-plate 3 decomposes and releases steam at high temperature, which can increase the pressure in the arc-extinguishing chamber.

[0035] The gas-generating sub-plate 3 is directly inserted into the gaps of the arc-extinguishing grid 1, which limits the arc root radius and reduces the arc ablation of the arc-extinguishing grid 1, thereby reducing the content of iron vapor in the air plasma, which is beneficial to increasing the arc voltage.

[0036] The arc isolation plate 2 is also provided with interval circular holes, and the gas production sub-plate 3 is provided with interval cylindrical protrusions, which are inserted into the interval circular holes and riveted to the arc isolation plate 2.

[0037] The permanent magnets (5) in the arc extinguishing chamber are arranged with N poles facing each other or S poles facing each other, thus achieving non-polarity.

[0038] like Figure 7 As shown in the figure, (a) shows the eight possible positions of the current when the current direction is perpendicular to the paper and inward, and the arrows in the figure indicate the direction of the Lorentz magnetic force on the current. Figure 7(a) It can be seen that when the arc column is at position 1 and position 6, according to the left-hand rule, the Lorentz magnetic force on the arc column causes the arc to move to the upper right of the arc extinguishing grid 1; when the arc column is at position 4 and position 7, the Lorentz magnetic force on the arc column causes the arc to move to the upper left of the arc extinguishing grid 1. At these four positions, the Lorentz magnetic force is conducive to the arc quickly entering the arc extinguishing grid 1 area, being cooled and cut by the arc extinguishing grid 1, thereby increasing the arc voltage and causing the arc current to pass through zero and extinguish. When the arc column is at position 2, the Lorentz magnetic force on the arc is directed to the lower right, and the arc will enter the area where position 7 is located under the action of the Lorentz magnetic force. At this moment, the direction of the Lorentz magnetic force on the arc is the same as that on position 7, and the arc will be subjected to the Lorentz magnetic force towards the upper left, causing the arc to move to the upper left of the arc extinguishing grid 1, which is also conducive to the arc entering the arc extinguishing grid 1 area. When the arc is at position 3, the arc will enter the area at position 4 under the action of the Lorentz magnetic force. At this time, the direction of the Lorentz magnetic force on the arc column changes, and the arc will move to the root of the arc extinguishing grid 1 under the Lorentz magnetic force to the upper left, so that it will be cut by the arc extinguishing grid 1. When the arc column is at position 5, it will enter the area at position 6 under the action of the Lorentz magnetic force. At this time, the direction of the Lorentz magnetic force changes, and the Lorentz magnetic force it receives will cause it to move to the upper right of the arc extinguishing grid 1, which is also conducive to arc cutting and arc voltage increase. When the arc column is at position 8, the Lorentz magnetic force will cause the arc to move toward the contact area, that is, in the opposite direction of the arc extinguishing grid 1; at this time, due to the presence of the gas-producing sub-plate 3, the gas-producing sub-plate 3 is eroded by the high-temperature arc, and a large amount of gas will be released, thereby increasing the pressure in the contact area. The direction of the airflow field is from the contact area to the arc extinguishing grid 1 area. Therefore, under the action of the airflow field, the arc will move toward the arc extinguishing grid 1 area. When the air blowing force of the airflow field on the arc is greater than the Lorentz magnetic force, the arc moves toward the root of the arc extinguishing grid 1, thereby being cut by the arc extinguishing grid 1 and increasing the arc voltage. Therefore, the permanent magnet 5 must work together with the gas-producing sub-plate 3. Under coordinated regulation, the arc will be quickly cut by the arc extinguishing grid 1 and the arc voltage will be increased, which is conducive to the extinction of the DC arc.

[0039] Similarly, Figure 7(b) shows the 8 possible positions of the arc column and the direction of the Lorentz magnetic force at each position when the current direction is perpendicular to the paper and outward. When the arc column is at position 2 and position 5, the Lorentz magnetic force causes the arc to move to the upper left of the arc extinguishing grid 1; when the arc column is at position 3 and position 8, the Lorentz magnetic force will cause the arc to move to the upper right of the arc extinguishing grid 1. This accelerates the arc to enter the root of the arc extinguishing grid 1 and be cut by the arc extinguishing grid 1, which is conducive to increasing the arc voltage. When the arc position is at position 1, it will move to the area where position 2 is located under the action of the Lorentz magnetic force. At this time, the direction of the Lorentz magnetic force changes, thereby prompting the arc to move to the upper left of the arc extinguishing grid 1. When the arc is at position 6, under the action of the Lorentz magnetic force, the arc will enter the area where position 3 is located, so that the Lorentz magnetic force makes it move to the upper right of the arc extinguishing grid 1; when the arc is at position 7, under the action of the Lorentz magnetic force, the arc will move to the area where position 8 is located. At this time, the Lorentz magnetic force on the arc column changes direction and is subjected to a force to the upper right of the arc extinguishing grid 1, so that the arc enters the upper right of the arc extinguishing grid 1 and is cut by the arc extinguishing grid 1. At the above positions, the Lorentz magnetic force generated by the permanent magnet 5 is conducive to the arc moving to the root of the arc extinguishing grid 1 and being cut by the arc extinguishing grid 1. When the arc is at position 4, the action of the Lorentz magnetic force will make it move in the opposite direction of the arc extinguishing grid 1. At this time, under the action of the gas-generating sub-plate 3, the air blowing force of the air flow field will make it move to the area of ​​the arc extinguishing grid 1. When the air blowing force is greater than the Lorentz magnetic force, the arc moves to the root of the arc extinguishing grid 1, so that it is cut by the arc extinguishing grid 1, increasing the arc voltage and facilitating the arc extinguishing.

[0040] like Figure 8 As shown, (a) is the direction of the Lorentz magnetic force on the arc column at 8 different positions when the current direction is perpendicular to the paper plane and inward. When the arc column is at position 2 and position 5, the arc moves to the upper left of the arc extinguishing grid 1 under the action of the Lorentz magnetic force. When the arc column is at position 3 and position 8, the arc moves to the upper right of the arc extinguishing grid 1 under the action of the Lorentz magnetic force, which is conducive to the arc being quickly cut by the arc extinguishing grid 1. When the arc column is at position 1, it will move to the magnetic field area at position 2 under the action of the Lorentz magnetic force, and the direction of the Lorentz magnetic force will change, and it will be subjected to a force to the upper right of the arc extinguishing grid 1, so that the arc will move to the root of the arc extinguishing grid 1; when the arc column is at position 6, it will move to the magnetic field area at position 3, so that it will be subjected to a force to the upper right of the arc extinguishing grid 1; when the arc column is at position 7, it will move to the area at position 8, and the direction of the Lorentz magnetic force will be to the upper right of the arc extinguishing grid 1, so that the arc will move to the root of the arc extinguishing grid 1. When the arc column is at position 4, the action of the Lorentz magnetic force will cause the arc to move to the contact area, but at the same time, due to the presence of the gas-producing sub-plate 3, the air blowing force of the air flow field will cause the arc to move to the root of the arc extinguishing grid 1. Under the interaction of air blowing and magnetic blowing, the arc will eventually move to the root of the arc extinguishing grid 1.

[0041] Similarly, if Figure 8 (b) shows the direction of the Lorentz magnetic force on the arc at 8 different positions when the current direction is perpendicular to the paper and outward. When the arc column is at positions 1 and 6, the arc will move to the upper right of the arc extinguishing grid 1 under the action of the Lorentz magnetic force; when the arc column is at positions 4 and 7, the arc will move to the upper left of the arc extinguishing grid 1 under the action of the Lorentz magnetic force; when the arc column is at position 2, it will move to the magnetic field area at position 7, and the arc will be subject to the Lorentz magnetic force to the upper left of the arc extinguishing grid 1; when the arc column is at position 3, it will move to the magnetic field area at position 7, and the arc will be subject to the Lorentz magnetic force to the arc extinguishing grid 1. Lorentz magnetic force at the upper left of grid 1; when the arc column is at position 5, it will move to the magnetic field area at position 6, and the arc will be affected by the Lorentz magnetic force at the upper right of arc extinguishing grid 1; when the arc column is at position 8, under the action of the Lorentz magnetic force, the arc will move toward the contact area. At this time, due to the presence of the gas-producing sub-plate 3, the air blowing force of the air flow field will cause the arc to move toward the root of the arc extinguishing grid 1. Under the interaction of air blowing and magnetic blowing, the arc will eventually move to the root of the arc extinguishing grid 1.

[0042] In summary, whether the arc current is perpendicular to the paper surface inward or perpendicular to the paper surface outward, Figure 7 and Figure 8 In the two arrangements of permanent magnets 5 shown, under the coordinated regulation of the gas-generating sub-plate 3 and the permanent magnets 5, the arc is favorable to move toward the root of the arc-extinguishing grid 1 and be cut by the arc-extinguishing grid 1, thereby increasing the arc voltage and forcing the DC arc current to pass through zero and extinguish the arc, thus realizing the non-polarity rapid interruption of the DC arc.

[0043] like Fig. 9 As shown, (a) is the arrangement of the gas-producing sub-plate of the present invention, and (b) is the traditional arrangement of the gas-producing sub-plate. It can be seen from the simulation results of the two arrangements that the arc movement speed is significantly faster than that of the traditional arrangement in the arrangement of the gas-producing sub-plate 3 expanding at the root of the arc-extinguishing grid 1 proposed by the present invention, which also illustrates the effectiveness of the scheme proposed by the present invention in accelerating the arc to enter the arc-extinguishing grid 1 area.

[0044] When the arc extinguishing chambers are arranged in series with multiple poles, the permanent magnets 5 of two adjacent arc extinguishing chambers have the same poles facing each other. Fig.10 As shown, (a) shows that both arc extinguishing chambers have two N poles facing each other, and (b) shows that both arc extinguishing chambers have two S poles facing each other, ensuring that there is no polarity between the two arc extinguishing chambers.

[0045] The present invention has the following advantages:

[0046] 1) The arc extinguishing chamber structure proposed in the present invention adopts a comprehensive control scheme of air blowing and magnetic blowing, which can quickly extinguish the arc regardless of whether the product breaks short-circuit current or critical current, thereby improving the product's electrical life and breaking capacity. In addition, through the reasonable arrangement of permanent magnets, the product has no polarity, and whether the wiring is positive or reverse, it will not affect the product performance.

[0047] 2) The two gas-producing sub-plates of the arc-extinguishing chamber structure are placed symmetrically, and the gas-producing sub-plates are arc-shaped, thus forming a nozzle structure. The arc-extinguishing grids are arranged in parallel and staggered from bottom to top, which is conducive to the arc being quickly cut by the grids. The two permanent magnets are placed with their N poles facing each other or their S poles facing each other to achieve non-polarity. Gas-producing sub-plates are placed on both sides of the arc-extinguishing chamber, and the permanent magnets are wrapped by the gas-producing sub-plates to avoid direct contact with the high-temperature arc and prevent the permanent magnets from demagnetizing. At the same time, the gas-producing sub-plates decompose and release steam at high temperatures, which can increase the pressure in the arc-extinguishing chamber.

[0048] 3) With the above structural design, when interrupting the critical small DC current, due to the effect of the permanent magnet, the arc is subjected to a larger Lorentz magnetic force. On the one hand, the Lorentz magnetic force on the arc is increased, accelerating the arc movement; on the other hand, the convection flux is enhanced, promoting efficient energy dissipation. When interrupting the short-circuit current, the gas-producing sub-plate will release a large amount of gas, increasing the pressure gradient between the inside of the arc extinguishing chamber and the gas outlet. At the same time, the gas is a high thermal conductivity gas, which accelerates the cooling of the arc and increases the arc voltage. Finally, by the relative arrangement of the N pole or S pole of the permanent magnet, the influence of the polarity of the DC current is eliminated, and DC non-polarity interruption is achieved.

Claims

1. A non-polarity integrated control arc extinguishing chamber for DC molded case circuit breakers, characterized in that: The invention comprises two arc-isolating plates (2) arranged vertically and in parallel, wherein the arc-isolating plates (2) are provided with a plurality of rows of riveted square holes arranged at intervals, and a plurality of arc-extinguishing grids (1) are located between the two arc-isolating plates (2) and are inserted into the riveted square holes and fixed by riveting; two gas-generating sub-plates (3) are located between the plurality of arc-extinguishing grids (1) and are respectively riveted to the two arc-isolating plates (2) after passing through the gaps between the arc-extinguishing grids (1); the two gas-generating sub-plates (3) are also provided with slots, and the slots are covered with permanent magnets (5); The arc-extinguishing grid (1) is a U-shaped structure, with protrusions inserted into riveted square holes on the outside of the legs on both sides, and a protruding trapezoidal platform at the root; a notch is formed inside the arc-extinguishing grid (1) on one side close to the legs; The arc-extinguishing grids (1) are arranged alternately in positive and negative directions from top to bottom, and the notches are evenly distributed on both sides of the central axis of the arc-extinguishing grids (1) to form two gas flow channels; the top and bottom arc-extinguishing grids (1) are both provided with arc-starting angles; The side of the gas-producing sub-plate (3) in contact with the arc-isolating plate (2) is transversely provided with multiple rows of grooves for accommodating the arc-extinguishing grid (1), and the middle part is a vertical permanent magnet (5) covering the groove; the side of the gas-producing sub-plate (3) away from the arc-isolating plate (2) is an outwardly convex arc, that is, the arc-extinguishing grid (1) is contracted at the leg part and expanded at the root part; The gas-generating sub-plate (3) covers the root and leg regions of the arc-extinguishing grid (1).

2. The non-polarity comprehensive control arc extinguishing chamber for DC molded case circuit breaker according to claim 1, characterized in that: The permanent magnet (5) is covered with a magnet sleeve (4).

3. The non-polarity comprehensive control arc extinguishing chamber for DC molded case circuit breaker according to claim 1, characterized in that: The notch has a depth of 3-6 mm and a width of 2-5 mm.

4. The non-polarity comprehensive control arc extinguishing chamber for DC molded case circuit breaker according to claim 1, characterized in that: The thickness of the arc starting angle is 2.5-3 mm.

5. The non-polarity comprehensive control arc extinguishing chamber for DC molded case circuit breaker according to claim 1, characterized in that: The arc isolation plate (2) is also provided with spaced circular holes, and the gas production sub-plate (3) is provided with spaced cylindrical protrusions which are inserted into the spaced circular holes and then riveted to the arc isolation plate (2).

6. The non-polarity comprehensive control arc extinguishing chamber for DC molded case circuit breaker according to claim 5, characterized in that: The gas-generating sub-plate (3) is made of a gas-generating material, which is polyamide containing 30% glass fiber.

7. The non-polarity comprehensive control arc extinguishing chamber for DC molded case circuit breaker according to claim 1, characterized in that: The permanent magnets (5) in the arc extinguishing chamber are arranged with their N poles facing each other or their S poles facing each other.

8. The non-polarity comprehensive control arc extinguishing chamber for DC molded case circuit breaker according to claim 1, characterized in that: When the arc extinguishing chambers are arranged in series with multiple poles, the permanent magnets (5) of two adjacent arc extinguishing chambers have the same magnetic poles facing each other.

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