CN112216575A - Nonpolarity comprehensive regulation and control arc extinguish chamber for direct current molded case circuit breaker - Google Patents
Nonpolarity comprehensive regulation and control arc extinguish chamber for direct current molded case circuit breaker Download PDFInfo
- Publication number
- CN112216575A CN112216575A CN202011010798.XA CN202011010798A CN112216575A CN 112216575 A CN112216575 A CN 112216575A CN 202011010798 A CN202011010798 A CN 202011010798A CN 112216575 A CN112216575 A CN 112216575A
- Authority
- CN
- China
- Prior art keywords
- arc
- extinguishing
- extinguishing grid
- gas
- molded case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses a nonpolarity comprehensive regulation and control arc extinguish chamber for a direct current molded case circuit breaker, which comprises two arc isolating plates which are vertically arranged in parallel, wherein the arc isolating plates are provided with a plurality of rows of riveting square holes which are arranged at intervals, and a plurality of arc extinguish grid pieces are positioned between the two arc isolating plates and are riveted and fixed after being inserted into the riveting square holes; the two gas generating auxiliary plates are positioned among the arc extinguishing grid pieces, penetrate through gaps among the arc extinguishing grid pieces and are respectively riveted with the two arc isolating plates; the two gas-generating subplates are also provided with clamping grooves, and permanent magnets are wrapped in the clamping grooves. The arc extinguish chamber structure provided by the invention adopts a comprehensive regulation and control scheme of air blowing and magnetic blowing, so that electric arcs can be quickly extinguished no matter a product breaks short-circuit current or critical current, and the electric service life and breaking capacity of the product are improved. And through the reasonable arrangement of the permanent magnet, the product has no polarity, and the product performance is not influenced no matter whether the wiring is in positive connection or in reverse connection.
Description
Technical Field
The invention belongs to the technical field of low-voltage direct-current circuit breakers, and relates to a nonpolarity comprehensive regulation and control arc extinguish chamber for a direct-current molded case circuit breaker.
Background
The gradual development of the photovoltaic and wind power generation industries, the demand of the direct current circuit breaker in the photovoltaic and wind power is increasing, and the voltage of the direct current side of the system is increasing and is developing towards DC 1500V. Therefore, the performance requirements for the dc circuit breaker are increasing. The short-circuit current of the direct current circuit breaker is smaller than that of the alternating current circuit breaker, so the generated Lorentz magnetic force is small, and the arc is difficult to be rapidly introduced into an arc extinguishing chamber for arc extinguishing by means of traditional single air blowing or magnetic blowing. In addition, the direct current does not have natural zero crossing points, so the direct current molded case circuit breaker is difficult to break the direct current short-circuit current, especially the high-voltage direct current short-circuit current. Therefore, the existing circuit breaker usually adopts a permanent magnet to provide an external magnetic field, so that the arc is elongated and rapidly enters the arc extinguishing chamber. However, in application scenarios such as photovoltaic and wind power, the dc circuit breaker may face reverse dc current breaking, when the dc circuit breaker has polarity and current is reversed, the arc is pulled out of the arc extinguish chamber by the lorentn magnetic force generated by the permanent magnet, and cannot be caused to enter the grid, and breaking is impossible, which causes damage to the operating mechanism of the ablation circuit breaker.
At present, when critical small current is cut off, the Lorentz magnetic force of the existing direct current molded case circuit breaker is small, arc can not be extinguished in time, the contact of a product is seriously ablated, and the electrical service life of the product is seriously shortened. The direct current molded case circuit breaker uses the permanent magnet, so that the product has polarity, and if the current is reversed, the problems of breaking and the like cannot be solved.
Disclosure of Invention
The invention aims to provide a nonpolarity comprehensive regulation and control arc extinguish chamber for a direct current molded case circuit breaker, which adopts comprehensive regulation and control of air blowing and magnetic blowing, not only enhances the air blowing effect, but also enhances the magnetic blowing effect on electric arcs, promotes the electric arcs to rapidly enter a grid plate area, enhances the energy dissipation of the electric arcs, and thus achieves the characteristic of rapidly extinguishing the electric arcs.
The technical scheme adopted by the invention is that the nonpolarity comprehensive regulation and control arc extinguish chamber for the direct current molded case circuit breaker comprises two arc isolating plates which are vertically arranged in parallel, wherein a plurality of rows of riveting square holes which are arranged at intervals are formed in the arc isolating plates, and a plurality of arc extinguish grid pieces are positioned between the two arc isolating plates and are riveted and fixed after being inserted into the riveting square holes; the two gas generating auxiliary plates are positioned among the arc extinguishing grid pieces, penetrate through gaps among the arc extinguishing grid pieces and are respectively riveted with the two arc isolating plates; the two gas-generating subplates are also provided with clamping grooves, and permanent magnets are wrapped in the clamping grooves.
The permanent magnet is covered with a magnet sleeve.
The arc extinguishing grid plate is of a U-shaped structure, the outer sides of the leg parts on the two sides are provided with protrusions inserted into riveting square holes, and the root parts of the arc extinguishing grid plate are provided with convex trapezoidal platforms; a notch is arranged in one side of the arc extinguishing grid piece close to the leg part, the depth of the notch is 3-6mm, and the width of the notch is 2-5 mm.
The arc-extinguishing grid pieces are alternately arranged from top to bottom in a positive and negative way, and the gaps are uniformly distributed on two sides of the central axis of the arc-extinguishing grid pieces to form two gas flow channels; the top arc-extinguishing grid plate and the bottom arc-extinguishing grid plate are both provided with arc striking angles, and the thickness of the arc-extinguishing grid plates is 2.5-3 mm.
One side of the gas-generating subplate, which is contacted with the arc-isolating plate, is transversely provided with a plurality of rows of grooves for accommodating arc-extinguishing grid pieces, and the middle part is a vertical permanent magnet coating clamping groove; one side of the gas generating auxiliary plate, which is far away from the arc isolating plate, is an arc shape which protrudes outwards, namely the leg part of the arc extinguishing grid plate is contracted, and the root part is expanded.
The arc isolating plate is also provided with spacing round holes, and the gas generating auxiliary plate is provided with spacing cylindrical bulges and is riveted with the arc isolating plate after being inserted into the spacing round holes.
The gas-producing auxiliary plate is prepared from a gas-producing material, and is polyamide containing 30% of glass fiber.
The permanent magnets in the arc extinguishing chamber are arranged with N poles opposite or S poles opposite.
When the arc extinguish chambers are arranged in series, the permanent magnets of two adjacent arc extinguish chambers are opposite in like magnetic poles.
The invention has the beneficial effects that:
1) the arc extinguish chamber structure provided by the invention adopts a comprehensive regulation and control scheme of air blowing and magnetic blowing, so that electric arcs can be quickly extinguished no matter a product breaks short-circuit current or critical current, and the electric service life and breaking capacity of the product are improved. And through the reasonable arrangement of the permanent magnet, the product has no polarity, and the product performance is not influenced no matter whether the wiring is in positive connection or in reverse connection.
2) Two gas-generating auxiliary plates of the arc extinguish chamber structure are symmetrically arranged, and the gas-generating auxiliary plates are arc-shaped, so that a nozzle structure is formed. The arc extinguishing grid pieces are arranged in parallel from bottom to top and are arranged in a staggered mode, and arc is favorably and quickly cut by the grid pieces. The two permanent magnets are arranged with N poles opposite or S poles opposite, so that no polarity is realized. The two sides of the arc extinguish chamber are provided with the gas generating subplates, the permanent magnet is wrapped by the gas generating subplates to avoid direct contact with high-temperature electric arc, the permanent magnet is prevented from demagnetization, and meanwhile, the gas generating subplates decompose and release steam at high temperature, thereby increasing the pressure in the arc extinguish chamber.
3) By adopting the structural design, when the direct current critical small current is cut off, the Lorentz force on the electric arc is larger due to the action of the permanent magnet, so that the Lorentz force on the electric arc is increased, and the movement of the electric arc is accelerated; on the other hand, the convection flux is enhanced, and the efficient dissipation of energy is promoted. When short-circuit current is cut off, a large amount of gas can be released from the gas generating subplate, the pressure gradient between the interior of the arc extinguish chamber and the gas outlet is increased, and meanwhile, the gas is high-heat-conductivity gas, so that electric arc cooling is accelerated, and electric arc voltage is improved. And finally, the influence of the polarity of the direct current is eliminated by the relative arrangement mode of the N poles or the S poles of the permanent magnets, and the direct-current non-polarity switching-on and switching-off is realized.
Drawings
Fig. 1 is a structural diagram of a nonpolarity comprehensive regulation arc extinguish chamber for a direct current molded case circuit breaker according to the present invention;
FIG. 2 is a diagram showing the relationship among the positions of an arc extinguishing grid, a gas generating subplate and a permanent magnet in the non-polar comprehensive regulation and control arc extinguishing chamber for the DC molded case circuit breaker according to the present invention;
fig. 3 is a three-dimensional structure diagram of an arc extinguishing grid sheet in the nonpolarity comprehensive regulation arc extinguishing chamber for the direct current molded case circuit breaker according to the present invention;
fig. 4 is a structural diagram of an arc extinguishing grid sheet in a nonpolarity comprehensive regulation arc extinguishing chamber for a direct current molded case circuit breaker according to the present invention;
FIG. 5 is a structural diagram of a gas-generating subplate in the nonpolarity comprehensive regulation arc-extinguishing chamber for the DC molded case circuit breaker according to the present invention;
FIG. 6 is a diagram of the relationship between the positions of arc-extinguishing grids and permanent magnets in the non-polar comprehensive regulation arc-extinguishing chamber for the DC molded case circuit breaker according to the present invention;
fig. 7 is a scheme of relative arrangement of N poles for realizing nonpolarity of permanent magnets in a nonpolarity comprehensive regulation arc-extinguishing chamber for a direct current molded case circuit breaker, wherein (a) is when a current direction is perpendicular to a paper surface inward, and (b) is when the current direction is perpendicular to the paper surface outward;
fig. 8 is a scheme of relative arrangement of S poles for realizing nonpolarity of permanent magnets in a nonpolarity comprehensive regulation arc-extinguishing chamber for a direct current molded case circuit breaker according to the present invention, wherein (a) is when a current direction is perpendicular to a paper surface inward, and (b) is when the current direction is perpendicular to the paper surface outward;
fig. 9 is a comparison graph of a simulation result of an arrangement manner of a gas generation subplate in an arc extinguishing grid piece in a nonpolarity comprehensive regulation and control arc extinguishing chamber for a direct current molded case circuit breaker of the present invention and a simulation result of a conventional arrangement manner, in which (a) is the arrangement manner of the gas generation subplate of the present invention and (b) is the arrangement manner of the conventional gas generation subplate;
fig. 10 is a schematic diagram of a permanent magnet arrangement when 2 poles are connected in series in a non-polar comprehensive regulation arc-extinguishing chamber for a direct-current molded case circuit breaker according to the present invention, wherein (a) two arc-extinguishing chambers are both opposite in N-pole, and (b) two arc-extinguishing chambers are both opposite in S-pole.
In the figure: 1. arc extinguishing grid, 2 arc isolating plate, 3 gas generating auxiliary plate, 4 magnet sleeve, 5 permanent magnet
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, 2 and 6, the non-polar comprehensive regulation arc extinguish chamber for the direct current molded case circuit breaker comprises two arc barriers 2 which are vertically arranged in parallel, wherein a plurality of rows of riveting square holes which are arranged at intervals are formed in the arc barriers 2, and a plurality of arc extinguish grid pieces 1 are positioned between the two arc barriers 2 and are inserted into the riveting square holes to be riveted and fixed; the two gas-generating auxiliary plates 3 are positioned among the arc-extinguishing grid pieces 1 and are respectively riveted with the two arc-isolating plates 2 after penetrating through gaps among the arc-extinguishing grid pieces 1; the two gas production subplates 3 are also provided with clamping grooves, and permanent magnets 5 are covered in the clamping grooves.
The permanent magnet 5 is externally coated with a magnet sleeve 4, and the gas production auxiliary plate 3 is prepared from a gas production material, and specifically comprises the following steps: PA66 (30% glass fiber).
As shown in fig. 3-4, for the arc-extinguishing grid plate 1, the left side of the dotted line is the grid plate root, and the right side of the dotted line is the grid plate leg, in this example, the arc-extinguishing grid plate 1 is composed of 21 arc-extinguishing grid plates 1, the arc-extinguishing grid plate 1 is a U-shaped structure, the outer sides of the legs at both sides are provided with protrusions inserted into riveting square holes, and the root is provided with a convex trapezoidal platform; the arc extinguishing grid plate 1 is provided with a notch at one side close to the leg, the depth of the notch is 3-6mm, and the width of the notch is 2-5 mm.
The arc-extinguishing grid pieces 1 are alternately arranged from top to bottom in a positive and negative mode, and the gaps are uniformly distributed on two sides of the central axis of the arc-extinguishing grid pieces 1 to form two gas flow channels; the top arc-extinguishing grid plate 1 and the bottom arc-extinguishing grid plate 1 are provided with arc striking angles, the thickness of the arc-extinguishing grid plates is 2.5-3mm, and the thickness of the rest grid plates is 1.5-2 mm.
As shown in fig. 5, a plurality of rows of grooves for accommodating arc extinguishing grid pieces 1 are transversely formed on one side of the gas generating subplate 3, which is in contact with the arc isolating plate 2, and a vertical permanent magnet 5 is wrapped in a clamping groove in the middle; one side of the gas production auxiliary plate 3, which is far away from the arc isolating plate 2, is an arc shape which protrudes outwards, namely the leg part of the arc extinguishing grid sheet 1 contracts, and the root part expands; thus, the two gas-generating sub-plates 3 are symmetrically arranged to form a nozzle structure, thereby accelerating an airflow field and promoting electric arcs to rapidly enter the area of the arc-extinguishing grid plate 1. The gas-generating subplate 3 coats the permanent magnet 5, thereby avoiding direct contact between the permanent magnet and high-temperature electric arc, preventing demagnetization of the permanent magnet 5, and meanwhile, the gas-generating subplate 3 decomposes at high temperature to release steam, thus increasing the pressure in the arc extinguishing chamber.
The gas-generating auxiliary plate 3 is directly inserted between the gaps of the arc-extinguishing grid pieces 1, so that the arc root radius is limited, and the ablation of the arc-extinguishing grid pieces 1 by the electric arc is reduced, thereby reducing the content of iron vapor in air plasma and being beneficial to improving the arc voltage.
The arc baffle 2 is also provided with spacing round holes, and the gas-generating auxiliary plate 3 is provided with spacing cylindrical bulges and is riveted with the arc baffle 2 after being inserted into the spacing round holes.
The permanent magnets (5) in the arc extinguishing chambers are arranged in a mode that N poles are opposite or S poles are opposite, and nonpolarity is achieved.
As shown in fig. 7, (a) is 8 possible positions where the current may be when the current direction is perpendicular to the paper surface, and the arrows in the figure indicate the direction of the lorentz force applied to the current. As can be seen from fig. 7(a), when the arc column is located at the position 1 and the position 6, the arc moves to the upper right of the arc chute 1 by the lorentz force applied to the arc column according to the left-hand rule; when the arc column is at the position 4 and the position 7, the arc moves towards the upper left of the arc-extinguishing grid sheet 1 by the Lorentz magnetic force, and when the arc column is at the four positions, the Lorentz magnetic force is beneficial to the arc to rapidly enter the area of the arc-extinguishing grid sheet 1, and the arc is cooled and cut by the arc-extinguishing grid sheet 1, so that the arc voltage is improved, and the arc current is enabled to pass through zero to be extinguished. When the arc column is located at the position 2, the Lorentz force borne by the arc faces to the lower right, the arc enters the area where the position 7 is located under the action of the Lorentz force, the Lorentz force direction borne by the arc is the same as the Lorentz force direction borne by the position 7, the Lorentz force towards the upper left is borne by the arc, the arc moves towards the upper left of the arc-extinguishing grid piece 1, and the arc can enter the area of the arc-extinguishing grid piece 1 conveniently. When the arc position was in position 3, the electric arc will get into position 4 place region under the effect of lorentz force, and the lorentz force direction that the arc post received at this moment changes, receives the lorentz force to the upper left side, and the electric arc will be to the operation of arc extinguishing bars piece 1 root to be cut by arc extinguishing bars piece 1. When the arc column is located at the position 5, the arc column enters the area where the position 6 is located under the action of the Lorentz magnetic force, at the moment, the direction of the Lorentz magnetic force is changed, and the Lorentz magnetic force enables the arc column to move towards the upper right of the arc extinguishing grid piece 1, so that the cutting of an arc and the improvement of arc voltage are facilitated. When the arc column is positioned at the position 8, the arc moves to the contact area by the Lorentz force, namely moves to the opposite direction of the arc extinguishing grid sheet 1; at the moment, due to the existence of the gas production auxiliary plate 3, the gas production auxiliary plate 3 is ablated by high-temperature electric arc, a large amount of gas is released, so that the pressure of a contact area is increased, the direction of an airflow field is from the contact area to the area of the arc-extinguishing grid plate 1, therefore, under the action of the airflow field, the electric arc moves to the area of the arc-extinguishing grid plate 1, and when the blowing force of the airflow field applied to the electric arc is greater than the Lorentz force applied to the electric arc, the electric arc moves to the root of the arc-extinguishing grid plate 1, so that the electric arc is cut by the arc-extinguishing. Therefore, the permanent magnet 5 and the gas production subplate 3 have to act together to cooperatively regulate and control the arc to be rapidly cut by the arc-extinguishing grid sheet 1 and improve the arc voltage, which is beneficial to the extinguishing of the direct current arc.
Similarly, fig. 7(b) shows 8 possible positions of the arc column and the lorentz magnetic force applied to each position when the current direction is perpendicular to the paper surface. When the arc column is positioned at the position 2 and the position 5, the arc moves towards the upper left of the arc extinguishing grid sheet 1 by the Lorentz magnetic force; when the arc column is at the position 3 and the position 8, the action of the lorentz force will move the arc to the upper right of the arc chute 1. This accelerates the arc to enter the root of the arc chute 1 and to be cut by the arc chute 1, which is beneficial to increase the arc voltage. When the arc position is at position 1, the arc moves to the area of position 2 under the action of Lorentz force, and at the moment, the direction of the Lorentz force changes, so that the arc is promoted to move towards the upper left of the arc-extinguishing grid plate 1. When the arc position is at the position 6, the arc enters the area of the position 3 under the action of the Lorentz force, so that the Lorentz force enables the arc to move towards the upper right of the arc-extinguishing grid plate 1; when the arc position is located at position 7, the arc column moves to the area where position 8 is located under the action of the Lorentz magnetic force, the direction of the Lorentz magnetic force borne by the arc column changes, and the arc column is subjected to the force towards the upper right of the arc-extinguishing grid sheet 1, so that the arc enters the upper right of the arc-extinguishing grid sheet 1 and is cut by the arc-extinguishing grid sheet 1. In these positions, the lorentz force generated by the permanent magnet 5 facilitates the arc to move towards the root of the arc chute 1 and to be cut by the arc chute 1. When the arc position is at the position 4, the arc moves in the opposite direction to the arc-extinguishing grid plate 1 under the action of the Lorentz magnetic force, at the moment, the gas blowing force of the airflow field moves to the area of the arc-extinguishing grid plate 1 under the action of the gas-generating auxiliary plate 3, and when the gas blowing force is greater than the Lorentz magnetic force, the arc moves to the root of the arc-extinguishing grid plate 1, so that the arc is cut by the arc-extinguishing grid plate 1, the arc voltage is improved, and the arc extinguishing is facilitated.
As shown in fig. 8, (a) is the direction of lorentz force applied to the arc column at 8 different positions when the current direction is perpendicular to the paper surface and inwards. When the arc column is located position 2 and position 5, under the effect of lorentz magnetic force, the arc moves to arc extinguishing bars piece 1 upper left side, when the arc column is located position 3 and position 8, under the effect of lorentz magnetic force, the arc moves to arc extinguishing bars piece 1 upper right side, is favorable to the arc to be cut by arc extinguishing bars piece 1 fast. When the arc column is positioned at the position 1, the arc column moves to the magnetic field area of the position 2 under the action of the Lorentz magnetic force, the direction of the Lorentz magnetic force is changed, and the arc column is subjected to a force towards the upper right of the arc-extinguishing grid sheet 1, so that the arc moves towards the root of the arc-extinguishing grid sheet 1; when the arc column is positioned at the position 6, the arc column moves to the magnetic field area of the position 3, so that the arc column is forced to the upper right of the arc-extinguishing grid sheet 1; when the arc column is located at the position 7, the arc column moves to the area of the position 8, the direction of the Lorentz magnetic force is towards the upper right of the arc-extinguishing grid plate 1, and therefore the arc moves towards the root of the arc-extinguishing grid plate 1. When the arc column is at the position 4, the action of the Lorentz magnetic force can make the arc move to the contact area, but at the same time, due to the existence of the gas generating auxiliary plate 3, the gas blowing force of the gas flow field can make the arc move to the root of the arc-extinguishing grid plate 1, and finally the arc moves to the root of the arc-extinguishing grid plate 1 under the interaction of the gas blowing and the magnetic blowing.
Similarly, as shown in fig. 8(b), when the current direction is perpendicular to the paper surface, the arc is subjected to lorentz magnetic force directions at 8 different positions. When the arc columns are positioned at the positions 1 and 6, the arc moves to the upper right of the arc extinguishing grid sheet 1 under the action of the Lorentz magnetic force; when the arc columns are positioned at the positions 4 and 7, the arc moves towards the upper left of the arc extinguishing grid sheet 1 under the action of the Lorentz magnetic force; when the arc column is positioned at the position 2, the arc column moves to the magnetic field area of the position 7, and the arc is subjected to Lorentz magnetic force towards the upper left of the arc extinguishing grid sheet 1; when the arc column is positioned at the position 3, the arc column moves to the magnetic field area of the position 7, and the arc is subjected to Lorentz magnetic force towards the upper left of the arc extinguishing grid sheet 1; when the arc column is positioned at the position 5, the arc column moves to the magnetic field area of the position 6, and the arc is subjected to Lorentz magnetic force towards the upper right of the arc extinguishing grid sheet 1; when the arc column is positioned at the position 8, the electric arc moves to the contact area under the action of Lorentz magnetic force, at the moment, due to the existence of the gas generation auxiliary plate 3, the gas blowing force of the airflow field enables the electric arc to move to the root of the arc-extinguishing grid plate 1, and finally the electric arc moves to the root of the arc-extinguishing grid plate 1 under the interaction of the gas blowing and the magnetic blowing.
In summary, no matter the arc current is inward from the paper surface or outward from the paper surface, as shown in fig. 7 and fig. 8, with the two permanent magnet 5 arrangements, under the cooperative regulation and control action of the gas generation subplate 3 and the permanent magnet 5, the arc is beneficial to moving to the root of the arc chute 1 and is cut by the arc chute 1, so as to improve the arc voltage, thereby forcing the direct current arc current to pass through zero and the arc to be extinguished. The non-polarity rapid on-off of the direct current arc is realized.
As shown in fig. 9, (a) is the arrangement of the gas production sub-plate of the present invention, and (b) is the arrangement of the conventional gas production sub-plate; the simulation results of the two arrangement modes show that the arc moving speed is obviously higher than that of the traditional arrangement mode under the arrangement mode that the gas generating auxiliary plate 3 at the root part of the arc-extinguishing grid plate 1 is expanded, and the effectiveness of the scheme provided by the invention in accelerating the arc to enter the area of the arc-extinguishing grid plate 1 is also demonstrated.
When the arc extinguish chambers are arranged in series, the permanent magnets 5 of two adjacent arc extinguish chambers have the same name and opposite magnetic poles. As shown in fig. 10, (a) both the two arc-extinguishing chambers are opposite to each other in the N-pole direction, and (b) both the two arc-extinguishing chambers are opposite to each other in the S-pole direction, so that the same polarity between the two arc-extinguishing chambers is ensured.
The invention has the following advantages:
1) the arc extinguish chamber structure provided by the invention adopts a comprehensive regulation and control scheme of air blowing and magnetic blowing, so that electric arcs can be quickly extinguished no matter a product breaks short-circuit current or critical current, and the electric service life and breaking capacity of the product are improved. And through the reasonable arrangement of the permanent magnet, the product has no polarity, and the product performance is not influenced no matter whether the wiring is in positive connection or in reverse connection.
2) Two gas-generating auxiliary plates of the arc extinguish chamber structure are symmetrically arranged, and the gas-generating auxiliary plates are arc-shaped, so that a nozzle structure is formed. The arc extinguishing grid pieces are arranged in parallel from bottom to top and are arranged in a staggered mode, and arc is favorably and quickly cut by the grid pieces. The two permanent magnets are arranged with N poles opposite or S poles opposite, so that no polarity is realized. The two sides of the arc extinguish chamber are provided with the gas generating subplates, the permanent magnet is wrapped by the gas generating subplates to avoid direct contact with high-temperature electric arc, the permanent magnet is prevented from demagnetization, and meanwhile, the gas generating subplates decompose and release steam at high temperature, thereby increasing the pressure in the arc extinguish chamber.
3) By adopting the structural design, when the direct current critical small current is cut off, the Lorentz force on the electric arc is larger due to the action of the permanent magnet, so that the Lorentz force on the electric arc is increased, and the movement of the electric arc is accelerated; on the other hand, the convection flux is enhanced, and the efficient dissipation of energy is promoted. When short-circuit current is cut off, a large amount of gas can be released from the gas generating subplate, the pressure gradient between the interior of the arc extinguish chamber and the gas outlet is increased, and meanwhile, the gas is high-heat-conductivity gas, so that electric arc cooling is accelerated, and electric arc voltage is improved. And finally, the influence of the polarity of the direct current is eliminated by the relative arrangement mode of the N poles or the S poles of the permanent magnets, and the direct-current non-polarity switching-on and switching-off is realized.
Claims (9)
1. The nonpolar comprehensive regulation arc extinguish chamber for the direct current molded case circuit breaker is characterized by comprising two arc isolating plates (2) which are vertically arranged in parallel, wherein a plurality of rows of riveting square holes which are arranged at intervals are formed in the arc isolating plates (2), and a plurality of arc extinguish grid pieces (1) are positioned between the two arc isolating plates (2) and are riveted and fixed after being inserted into the riveting square holes; the two gas generation auxiliary plates (3) are positioned among the arc extinguishing grid pieces (1) and are respectively riveted with the two arc isolating plates (2) after penetrating through gaps among the arc extinguishing grid pieces (1); the two gas production subplates (3) are also provided with clamping grooves, and permanent magnets (5) are wrapped in the clamping grooves.
2. The non-polar comprehensive regulation arc-extinguishing chamber for direct current molded case circuit breakers according to claim 1, characterized in that said permanent magnet (5) is externally coated with a magnet sleeve (4).
3. The non-polar comprehensive regulation and control arc-extinguishing chamber for the direct-current molded case circuit breaker according to claim 1, characterized in that the arc-extinguishing grid sheet (1) is of a U-shaped structure, the outer sides of the legs at both sides are provided with protrusions inserted into riveting square holes, and the root part is provided with a convex trapezoidal platform; a notch is formed in one side, close to the leg, of the arc-extinguishing grid plate (1), the depth of the notch is 3-6mm, and the width of the notch is 2-5 mm.
4. The non-polar comprehensive regulation and control arc-extinguishing chamber for the direct-current molded case circuit breaker according to claim 1, wherein the arc-extinguishing grid pieces (1) are alternately arranged from top to bottom in a positive and negative way, and the gaps are uniformly distributed on two sides of the central axis of the arc-extinguishing grid pieces (1) to form two gas flow channels; the top arc-extinguishing grid plate and the bottom arc-extinguishing grid plate (1) are provided with arc striking angles, and the thickness of the arc-extinguishing grid plate is 2.5-3 mm.
5. The nonpolar comprehensive regulation and control arc extinguish chamber for the direct current molded case circuit breaker according to claim 1, wherein one side of the gas generation subplate (3) contacting the arc isolating plate (2) is transversely provided with a plurality of rows of grooves for accommodating arc extinguishing grid pieces (1), and the middle part is a vertical permanent magnet (5) coating clamping groove; one side of the gas generating auxiliary plate (3) far away from the arc isolating plate (2) is in an arc shape protruding outwards, namely, the leg part of the arc extinguishing grid plate (1) is contracted, and the root part of the arc extinguishing grid plate is expanded.
6. The non-polar comprehensive regulation arc-extinguishing chamber for the direct-current molded case circuit breaker according to claim 5, wherein the arc-extinguishing plate (2) is further provided with spaced circular holes, and the gas-generating subplate (3) is provided with spaced cylindrical protrusions and is riveted with the arc-extinguishing plate (2) after being inserted into the spaced circular holes.
7. The non-polar comprehensive regulation arc-extinguishing chamber for direct current molded case circuit breakers according to claim 6, characterized in that said gas-generating subplate (3) is made of a gas-generating material, being polyamide containing 30% glass fiber.
8. The non-polar comprehensive regulation arc-extinguishing chamber for direct-current molded case circuit breakers according to claim 1, characterized in that the permanent magnets (5) in the arc-extinguishing chamber are arranged with N poles opposite or S poles opposite.
9. The non-polar comprehensive regulation arc-extinguishing chamber for direct current molded case circuit breakers 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 are of like-name poles opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011010798.XA CN112216575A (en) | 2020-09-23 | 2020-09-23 | Nonpolarity comprehensive regulation and control arc extinguish chamber for direct current molded case circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011010798.XA CN112216575A (en) | 2020-09-23 | 2020-09-23 | Nonpolarity comprehensive regulation and control arc extinguish chamber for direct current molded case circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112216575A true CN112216575A (en) | 2021-01-12 |
Family
ID=74050950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011010798.XA Pending CN112216575A (en) | 2020-09-23 | 2020-09-23 | Nonpolarity comprehensive regulation and control arc extinguish chamber for direct current molded case circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112216575A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517163A (en) * | 2021-07-23 | 2021-10-19 | 西安理工大学 | Strong air-blowing current-limiting high-voltage circuit breaker arc extinguish chamber |
-
2020
- 2020-09-23 CN CN202011010798.XA patent/CN112216575A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517163A (en) * | 2021-07-23 | 2021-10-19 | 西安理工大学 | Strong air-blowing current-limiting high-voltage circuit breaker arc extinguish chamber |
| CN113517163B (en) * | 2021-07-23 | 2023-02-28 | 西安理工大学 | Strong air-blowing current-limiting type arc extinguish chamber of high-voltage circuit breaker |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203839321U (en) | Universal breaker arc-extinguishing chamber | |
| CN206401213U (en) | Contact of breaker arc initiation device | |
| CN112216575A (en) | Nonpolarity comprehensive regulation and control arc extinguish chamber for direct current molded case circuit breaker | |
| CN201229868Y (en) | Arc-extinguishing chamber for circuit breaker | |
| CN202977343U (en) | Mixed grating-sheet explosion chamber of breaker and low-voltage breaker | |
| CN213212091U (en) | Arc extinguish chamber structure of direct-current nonpolar molded case circuit breaker | |
| CN111900029A (en) | DC isolating switch arc extinguish chamber structure for enhancing energy dissipation | |
| CN206363976U (en) | The arc-control device of breaker | |
| CN219105960U (en) | Arc extinguishing device for extinguishing arc in electric switch and electric switch | |
| RU2306629C1 (en) | Arc-control device | |
| CN216288287U (en) | Arc extinguishing system of direct current molded case circuit breaker | |
| CN211578652U (en) | Permanent-magnet arc-extinguishing non-polar high-voltage large-current DC contactor | |
| CN216450582U (en) | Arc extinguishing device and circuit breaker comprising same | |
| CN211529826U (en) | Direct current contactor contact arc extinguishing system | |
| CN211529827U (en) | Arc extinguishing system of direct current contactor | |
| CN114724900A (en) | Direct current breaker with double arc extinguishing structures | |
| CN111430184A (en) | Permanent magnet arc extinguishing non-polar high-voltage large-current direct current contactor | |
| CN116313589B (en) | Arc extinguishing system and circuit breaker | |
| CN111146028A (en) | Direct current contactor contact arc extinguishing system | |
| CN218498011U (en) | Contact arc extinguishing system of circuit breaker | |
| CN220796568U (en) | Arc extinguishing device, switch unit and isolating switch | |
| CN113517163B (en) | Strong air-blowing current-limiting type arc extinguish chamber of high-voltage circuit breaker | |
| CN205645728U (en) | Miniature circuit breaker's arc extinguishing structure | |
| CN217035574U (en) | Quick arc control device | |
| RU208385U1 (en) | ARC EXTINGUISHING CHAMBER |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |